DE112014000220T5 - water pump - Google Patents

Abstract

A flow baffle is disposed downstream of an end portion of a tongue member in a scroll chamber and configured to reduce the flow rate of cooling water flowing on an outer edge side of the scroll chamber, the scroll chamber containing a downstream side leading to an exit port. and the tongue part separates the downstream side and an upstream side of the spiral chamber from each other.

Description

Technical area

The present invention relates to a water pump.

Technical background

A patent document 1 discloses art of this kind. Patent Document 1 discloses a pump including a partition wall, wherein the partition wall separates a curved flow path into a first flow path and a second flow path, and the curved flow path communicates with an exhaust pipe.

Documents of the prior art

Patent documents

• Patent Document 1: Japanese Patent Application Publication No. 2001-336499

Summary of the invention

Problem to be Solved by the Invention / Solving Problems

According to the technique described in Patent Document 1, the partition wall is arranged to extend beyond half of the curved flow path. This can adversely affect the efficiency due to a large loss of flow velocity. The present invention has been made in view of this system. An object of the present invention is to provide a water pump whose efficiency can be improved.

Means of solving the problem (s)

According to the present invention, in order to accomplish the above-described object, a flow guide plate is disposed downstream of an end portion of a tongue part in a scroll chamber and adapted to reduce a flow velocity of cooling water flowing at an outer peripheral edge. Side of the scroll chamber flows, wherein the spiral chamber includes a downstream side, which leads to an outlet opening, and the tongue part, the downstream side and an upstream or upstream side of the spiral chamber from each other.

Effect of the invention

Thus, the present invention can improve pump efficiency.

Brief description of the drawings

1 FIG. 10 is a perspective view of an electric water pump according to a first embodiment. FIG.

2 FIG. 14 is a view of the electric water pump according to the first embodiment in a state where a pump cover is removed. FIG.

3 Fig. 13 is a view illustrating a flow of cooling water in a scroll chamber in the case where there is no flow guide plate.

4 Fig. 13 is a view showing a flow of cooling water in a scroll chamber in the first embodiment in which a flow guide plate is provided.

5 FIG. 14 is a view of an electric water pump according to a second embodiment in a state where a pump cover is removed. FIG.

Embodiment (s) of the invention

First embodiment

An electric water pump 1 According to a first embodiment, a cooling pump that uses a coolant (cooling water) as a working fluid, and is installed in a circuit that is connected to a heat exchanger (radiator). The electric water pump 1 For example, is a water pump, with which a motor (internal combustion engine), a drive motor, an inverter, etc. in a hybrid electric vehicle, cooling water is supplied. 1 is a perspective view of the electric water pump 1 , The electric water pump 1 is in a pump housing 2 added. pump housing 2 consists of a pump body 21 and a pump cover 22 , pump cover 22 is with a suction port 23 and an exit opening 24 Mistake. An impeller 3 that has a variety of wings 30 is arranged so that it is in the electric water pump 1 turns, with rotation of impeller 3 this is done by cooling water via suction port 23 suck it, and it pushes the cooling water through the outlet opening 24 out. 2 is a view of the electric water pump 1 in a state in the pump cover 22 is removed. impeller 3 is in a room (impeller receiving part 26 ) received by the pump body 21 and pump cover 22 is formed inside. impeller 3 is rotatable on a rotary shaft 25 attached to the pump body 21 is attached. At an outer periphery of impeller receiving part 26 is a spiral chamber 27 formed as a spiral groove. spiral chamber 27 is formed in a spiral shape beginning at a point A in FIG 2 has and in the same direction as the direction of rotation of impeller 3 (in 2 clockwise). The following is a back side of spiral chamber 27 in the direction of rotation of impeller 3 referred to as an upstream side, and a forward side of the scroll chamber 27 in the direction of rotation of impeller 3 is referred to as a downstream side. spiral chamber 27 includes an exit port connection section 27a at a downstream end, wherein the exit port connecting portion 27a with an outlet opening 24 the pump cover 22 connected is. Outlet opening joint portion 27a contains a side surface that has an arc shape. pump body 21 is with a tongue part 21a provided, which separates the upstream side and the downstream side of each other. A flow baffle 28 is in spiral chamber 27 educated. baffle plate 28 separates part of spiral chamber 27 in two flow paths. baffle plate 28 is designed to be the same height as the spiral chamber 27 , baffle plate 28 is on a downstream side of spiral chamber 27 arranged and includes an upstream end portion 28a which is downstream of an end portion of tongue part 21a is arranged. baffle plate 28 includes a downstream end portion 28b leading to exit port connection section 27a extends, but not in contact with the side surface of the outlet opening connection portion 27a is. The upstream end portion 28a from flow guide plate 28 is closer to an outer edge of the spiral chamber 27 with respect to a midpoint (on a line B) of spiral chamber 27 in a transverse direction of spiral chamber 27 while the downstream end portion 28b from flow guide plate 28 closer to an inner periphery or edge of the spiral chamber 27 in terms of the center point (on line B) of spiral chamber 27 in the transverse direction of spiral chamber 27 lies.

function

3 is a view showing a stream of cooling water in spiral chamber 27 in the case shows that no flow baffle 28 is available. Cooling water is generated by rotation of impeller 3 via intake opening 23 aspirated by centrifugal force to spiral chamber 27 passed and flows in the same direction as the direction of rotation of impeller 3 , In this condition, the flow velocity is at the outer edge side of the scroll chamber 27 higher than the flow rate at the inner edge side of the spiral chamber 27 , Accordingly, it comes at the outlet opening connection portion 27a from spiral chamber 27 to an eddy current that flows from the outer edge side to the inner edge side, so that cooling water at the wall surface of the outlet opening 24 and flows along a pipe with the outlet opening 24 connected is. This leads to a loss of friction on the wall surface, and the friction increases the temperature of cooling water and the cooling efficiency is adversely affected. In view of this, in the first embodiment, spiral chamber 27 with flow guide plate 28 provided to the flow rate of cooling water on the outer edge side of spiral chamber 27 to reduce. 4 is a view showing a stream of cooling water in spiral chamber 27 in the first embodiment, in the flow guide plate 28 is available. The flow control plate 28 according to the first embodiment includes the upstream end portion 28a , which is closer to the outer edge of spiral chamber 27 in terms of the center of spiral chamber 27 in the transverse direction of spiral chamber 27 located, and the downstream end portion 28b , which is closer to the inner edge of spiral chamber 27 in terms of the center of spiral chamber 27 in the transverse direction of spiral chamber 27 located. Accordingly, the flow occurs at the outer edge side of the spiral chamber 27 at a narrower inlet and exits at a wider outlet, so that the flow rate decreases. On the other hand, the flow occurs at the outer edge side of the spiral chamber 27 at a wider inlet and exits at a narrower outlet so that the flow rate increases. Thereby lift at the outlet opening connection portion 27a from spiral chamber 27 the flow of cooling water at the outer-periphery side and the flow of cooling water at the inner-rim side are prevented from each other and prevent the occurrence of an eddy current. This causes reduction of the friction loss on the wall surface of the outlet opening 24 and the pipe, with the outlet opening 24 is connected, and prevents the temperature of cooling water increases, so that the pumping efficiency is improved. Furthermore, the flow guide plate is located 28 downstream of the end portion of tongue part 21a from spiral chamber 27 , This will change the length of flow baffle 28 shortened and thus reduces the flow channel resistance and improves the pumping efficiency.

effects

• 1) The water pump contains a pump housing ( 2 ) fitted with a suction port ( 23 ) and an exit opening ( 24 ), an impeller ( 3 ) rotatably mounted in an impeller-receiving part ( 26 ) of the pump housing ( 2 ) is arranged and arranged so that it is cooling water through the suction port ( 23 ) and the cooling water through the outlet opening ( 24 ), a spiral chamber ( 27 ) in a spiral shape on an outer edge of the impeller-receiving part ( 26 ) is formed and a downstream side leading to the outlet opening ( 24 ), a tongue part ( 21a ), the downstream side and an upstream side of the spiral chamber ( 27 ) and a flow baffle ( 28 ) located downstream of an end portion of the tongue part ( 21a ) in the spiral chamber ( 27 ) is arranged and adapted to reduce a flow rate of cooling water, which at an outer edge side of the spiral chamber ( 27 ) flows. Accordingly, lift at the outlet opening connection portion 27a from spiral chamber 27 the flow of cooling water at the outer-periphery side and the flow of cooling water at the inner-rim side are prevented from each other and prevent the occurrence of an eddy current.
• 2) The flow guide plate ( 28 ) contains an upstream end ( 28a ), which is closer to an outer edge of the spiral chamber ( 27 ) with respect to a center of the spiral chamber ( 27 ) in a transverse direction of the spiral chamber ( 27 ), and the flow guide plate ( 28 ) contains a downstream end ( 28b ), which is closer to an inner edge of the spiral chamber ( 27 ) with respect to the center of the spiral chamber ( 27 ) in the transverse direction of the spiral chamber ( 27 ) is located. Accordingly, by the Strömungsleitplatte 28 the flow velocity at the outer edge side of the spiral chamber 27 decreases, so that the flow of cooling water at the outer edge side and the flow of cooling water at the inner edge side at the outlet opening connection portion 27a from spiral chamber 27 cancel each other and prevent the occurrence of an eddy current.

Second embodiment

The following is an electric water pump 1 described according to a second embodiment. For the same construction as in the first embodiment, the same symbols are used, and description thereof will be omitted. 5 is a view of the electric water pump 1 in a state in the pump cover 22 is removed. A flow baffle 28 extends from a side surface of exit port connecting portion 27a in spiral chamber 27 into it. Thereby, the current becomes from the outer edge side to the inner edge side at the outlet opening connection portion 27a throttled and thereby prevents the occurrence of an eddy current.

effects

• 3) The flow guide plate 28 is formed so as to extend from the side surface of the exit port connecting portion 27a the spiral chamber 27 in the spiral chamber 27 extends into it. Thereby, the flow becomes from the outer edge side to the inner edge side to the outlet opening connection portion 27a throttled and thus prevents the occurrence of an eddy current.

Other embodiments

Although the present invention has been described above with reference to the first embodiment and the second embodiment, the structure of the present invention is not specifically limited to these embodiments. The present invention includes structural modifications when such modifications are within the scope of the invention.

LIST OF REFERENCE NUMBERS

1

electric water pump

3

impeller

21a

tongue part

23

suction

24

outlet opening

26

Vane receiving part

27

spiral chamber

28

baffle plate

Claims (3)

Water pump, which includes: a pump housing provided with a suction port and an exhaust port; an impeller rotatably disposed in an impeller receiving portion of the pump housing and adapted to draw cooling water via the suction port and expel the cooling water via the discharge port, a spiral chamber formed in a spiral shape on an outer periphery of the impeller receiving part and including a downstream side leading to the discharge port; a tongue portion separating the downstream side and an upstream side of the spiral chamber; such as a flow guide plate disposed downstream of an end portion of the tongue part in the scroll chamber and configured to reduce a flow rate of cooling water flowing on an outer peripheral side of the scroll chamber. A water pump according to claim 1, wherein: the flow guide plate includes an upstream end located closer to an outer edge of the scroll chamber with respect to a center of the scroll chamber in a transverse direction of the scroll chamber; and the flow guide plate includes a downstream end that is closer to an inner edge of the scroll chamber with respect to the center of the scroll chamber in the transverse direction of the scroll chamber. The water pump according to claim 1, wherein the flow guide plate is formed to extend from a side surface of a downstream end portion of the scroll chamber into the scroll chamber.

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