CN112460070B

CN112460070B - Water pump

Info

Publication number: CN112460070B
Application number: CN202011340805.2A
Authority: CN
Inventors: 孙传利; 王泽刚; 迟晓丽
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-08-05
Anticipated expiration: 2040-11-25
Also published as: CN112460070A

Abstract

The invention provides a water pump, which comprises a pump body and an impeller, wherein a water pressing chamber and a water inlet cavity are arranged in the pump body, a baffle is arranged between the water pressing chamber and the water inlet cavity, a through hole is formed in the baffle to communicate the water pressing chamber with the water inlet cavity, the impeller is arranged in the water pressing chamber, and the impeller and the through hole are coaxially arranged; one side of the baffle is provided with a water drainage hole, a throttling piece is inserted in the water drainage hole, and the throttling piece is provided with a bent channel communicated with the water pumping chamber and the water inlet cavity of the water pump. The invention provides a water pump which can effectively reduce the flow velocity of water flow flowing through a bent channel, thereby avoiding cavitation damage caused by overhigh flow velocity and overlow static pressure and effectively improving the cavitation resistance of a water drain hole.

Description

Water pump

Technical Field

The invention relates to the field of cooling system design, in particular to a water pump.

Background

The diesel engine has two major mechanisms and five major systems, one of which is a cooling system, and a water pump is a key part in the cooling system. Under a general condition, a water pump is driven by a belt to forcibly circulate cooling liquid, so that redundant heat which cannot be converted into effective work is taken away in time, and engine parts are guaranteed to work under a proper temperature condition.

When an engine discharges water, water in the water pump flows back to a water tank lower water chamber through a water pump water inlet pipe and is discharged to the outside through a water discharge valve at the bottom of the water tank lower water chamber. Water in the water pump vortex channel needs to flow back to the water inlet cavity of the water return pump through the pump eye to drain, but due to the structural limitation of the water pump, part of water can be reserved in the vortex channel and cannot be drained. The water penetrates through the bottom of the impeller, the impeller can be frozen and frozen in winter, and the impeller can be damaged when the water is restarted; in addition, when the antifreeze is replaced, the service life of the antifreeze is affected due to the fact that the old antifreeze is not stored. In order to solve the problem, in the prior art, a water drainage hole is additionally arranged at the bottom of the vortex channel, and partial water at the bottom of the vortex channel can be completely drained through the water drainage hole.

However, when the existing water pump works, the pressure difference between two ends of the water discharge hole is too large, and cavitation damage is easily generated.

Disclosure of Invention

The invention provides a water pump which can effectively reduce the flow velocity of water flow flowing through a bent channel, thereby avoiding cavitation damage caused by overhigh flow velocity and overlow static pressure and effectively improving the cavitation resistance of a water drain hole.

The invention provides a water pump, which comprises a pump body and an impeller, wherein a water pressing chamber and a water inlet cavity are arranged in the pump body, a baffle is arranged between the water pressing chamber and the water inlet cavity, a through hole is formed in the baffle to communicate the water pressing chamber with the water inlet cavity, the impeller is arranged in the water pressing chamber, and the impeller and the through hole are coaxially arranged;

one side of the baffle is provided with a water drainage hole, a throttling piece is inserted in the water drainage hole, and the throttling piece is provided with a bent channel communicated with the water pumping chamber and the water inlet cavity of the water pump.

Optionally, in the water pump provided by the present invention, the throttle member includes a first pipe section and a second pipe section, the first pipe section and the second pipe section are communicated with each other to form a bent passage, and the first pipe section and the second pipe section are arranged perpendicular to each other.

Optionally, in the water pump provided by the invention, the bent passage has a first opening and a second opening, and the first opening and the second opening are in different directions.

Optionally, in the water pump provided by the invention, the first opening is arranged on the first pipe section and faces the pumping chamber, and the second opening is arranged at one end of the second pipe section and extends into the water inlet cavity.

Optionally, in the water pump provided by the invention, one end of the first pipe section, which is provided with the first opening, is arranged towards the water flow direction of the pumping chamber.

Optionally, in the water pump provided by the invention, the outer side wall of the first pipe section is provided with an arc-shaped protrusion.

Optionally, in the water pump provided by the invention, the water discharge hole is formed at the bottom of the baffle.

Optionally, the water pump provided by the invention further comprises a rotating assembly, the rotating assembly is arranged on one side of the water pressurizing chamber, which is far away from the water inlet cavity, and one end of the rotating assembly extends into the water pressurizing chamber and is coaxially connected with the impeller.

Optionally, in the water pump provided by the invention, the rotating assembly comprises a rotating shaft and a sealing seat, the sealing seat is hermetically connected with the pumping chamber, and the rotating shaft is arranged in the sealing seat and connected with the impeller.

According to the water pump provided by the invention, the water discharge hole is formed, so that water in the water pressing chamber can be effectively discharged into the water inlet cavity after the water pump stops working, and the damage of water reserved in the water pressing chamber to an impeller is avoided; in addition, the throttling piece with the bent channel is arranged in the water drainage hole, so that the flow velocity of water flow flowing through the bent channel can be effectively reduced when the water pump works, cavitation damage caused by overhigh flow velocity, overhigh static pressure and overlow static pressure is avoided, and the cavitation resistance of the water drainage hole is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of an assembly of a water pump and a rotating assembly according to an embodiment of the present invention;

fig. 2 is a schematic view a of an installation of a throttle member in a water pump according to an embodiment of the present invention;

fig. 3 is a schematic view b illustrating the installation of a throttling element in the water pump according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a throttle member in a water pump according to an embodiment of the present invention.

Description of reference numerals:

1-a water pump;

10-a pump body;

11-a water pumping chamber;

12-a water inlet cavity;

13-a baffle;

131-a through hole;

132-a water discharge hole;

20-an impeller;

30-a throttle;

31-bending the channel;

311-a first opening;

312 — a second opening;

32-a first tube section;

33-a second pipe section;

40-a rotating assembly;

41-a rotating shaft;

42-sealing seat.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed and operated in specific orientations, and thus, are not to be construed as limiting the present invention.

The terms "first," "second," and "third" (if any) in the description and claims of this application and the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or maintenance tool that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or maintenance tool.

When the engine of one type discharges water, water in the water pump flows back to the lower water chamber of the water tank through the water inlet pipe of the water pump and is discharged to the outside through the water discharge valve at the bottom of the lower water chamber of the water tank. Water in the water pump vortex needs to flow back to the water inlet cavity of the water pump through the pump eye to drain, but due to the structural limitation of the water pump, part of water can be reserved in the vortex and cannot be drained. The water penetrates through the bottom of the impeller, the impeller can be frozen and frozen in winter, and the impeller can be damaged when the water is restarted; in addition, when the antifreeze is replaced, the service life of the antifreeze is affected due to the fact that the old antifreeze is not stored. In order to solve the problem, in the prior art, a water drainage hole is additionally arranged at the bottom of the vortex channel, and partial water at the bottom of the vortex channel can be completely drained through the water drainage hole. However, when the existing water pump works, and an engine works, the pressure difference between two ends of a water drain hole is too large (the point with the largest pressure difference of the whole cooling system is the pump lift), the flow resistance coefficient of the water drain hole cannot effectively reduce the flow velocity of overflowing, the flow velocity is too high, the static pressure is too low, a large amount of bubbles are separated out and diffused to a vortex channel (high-pressure water) for blasting, and cavitation damage is generated. In addition, the backflow flow of the water drainage hole is harmful in the running process of the water pump, and the volumetric efficiency of the water pump is reduced.

Based on this, this application provides a water pump, can the effectual reduction flow through the velocity of flow of the rivers of buckling the passageway to avoid the velocity of flow too high static pressure to cross the cavitation destruction of production excessively, the effectual anti cavitation ability that has promoted the hole that drains.

FIG. 1 is a schematic view of an assembly of a water pump and a rotating assembly according to an embodiment of the present invention; fig. 2 is a schematic view a of an installation of a throttle member in a water pump according to an embodiment of the present invention; fig. 3 is a schematic view b illustrating the installation of a throttle member in the water pump according to the embodiment of the present invention; fig. 4 is a schematic structural diagram of a throttle member in a water pump according to an embodiment of the present invention. As shown in fig. 1 to 4, the embodiment provides a water pump 1, which includes a pump body 10 and an impeller 20, wherein the pump body 10 has a water pressurizing chamber 11 and a water inlet chamber 12, a baffle 13 is disposed between the water pressurizing chamber 11 and the water inlet chamber 12, the baffle 13 is provided with a through hole 131 for communicating the water pressurizing chamber 11 and the water inlet chamber 12, the impeller 20 is installed in the water pressurizing chamber 11, and the impeller 20 and the through hole 131 are coaxially disposed.

Wherein, a cavity is arranged in the pump body 10, the cavity is divided into a pumping chamber 11 and a water inlet cavity 12 by a baffle 13, and a through hole 131 is clamped on the baffle 13 to communicate the pumping chamber 11 and the water inlet cavity 12. The impeller 20 is arranged in the pumping chamber 11, and the impeller 20 is arranged corresponding to the through hole 131 on the baffle 13, so that when the impeller 20 rotates, water in the water inlet cavity 12 can be pumped into the pumping chamber 11 through the through hole 131. In order to ensure that the impeller 20 can smoothly pump out water when rotating, the impeller 20 may be coaxially disposed with the through hole 131.

Because the baffle 13 is arranged between the pumping chamber 11 and the water inlet cavity 12, when the water pump 10 stops working, the impeller 20 stops moving, and at the moment, a part of water is reserved between the pumping chamber 11 and the baffle 13. In order to discharge part of water between the pumping chamber 11 and the baffle 13, a water discharge hole 132 is formed in one side of the baffle 13, a throttle 30 is inserted into the water discharge hole 132, and the throttle 30 has a bent passage 31 communicating the pumping chamber 11 and the water inlet chamber 12.

The water discharge hole 132 is formed at one side of the baffle 13, and when the water pump 1 stops operating, the impeller 20 stops rotating, thereby stopping the water in the water inlet chamber 12 from being drawn into the pumping chamber 11 through the through hole 131. At this time, water in the pumping chamber 11 higher than the bottom end of the through hole 131 flows back to the water inlet chamber 12 through the through hole 131, and part of water located at the lower side of the through hole 131 and the upper side of the water discharge hole 132 flows out of the water inlet chamber 12 through the water discharge hole 132, so that too much water is prevented from remaining in the pumping chamber 11. When only the water discharge hole 132 is arranged, when the water pump 1 works, the pressure difference at two ends of the water discharge hole 132 is too large, and the flow resistance coefficient of the water discharge hole 132 cannot effectively reduce the flow velocity of overflowing, so that the flow velocity is too high, the static pressure is too low, a large amount of bubbles are separated out and diffused into the pressurized water chamber 11 to explode, and cavitation damage is generated. In order to improve the cavitation resistance of the water discharge hole 132, the throttle member 30 is inserted into the water discharge hole 132, the throttle member 30 is provided with a bent passage 31 for communicating the pumping chamber 11 with the water inlet chamber 12, and when water is introduced into the bent passage 31, the high-pressure water passes through the bent passage 31 and contacts with the inner wall of the bent passage 31, so that the resistance coefficient is improved, the flow velocity of the water flow is reduced, and the cavitation resistance of the water discharge hole 132 is improved.

It should be noted that the water discharge hole 132 is opened at one side of the baffle 13, and in order to avoid the influence of the water remaining in the pressurized-water chamber 11 on the impeller 20, the water discharge hole 132 may be opened at a lower side of the baffle 13 at a position corresponding to the impeller 20, so as to discharge the water remaining in the pressurized-water chamber 11 to a lower side of the blades of the impeller 20, and avoid the damage of the frozen water on the impeller 20, which is not limited in this embodiment.

In the present embodiment, the impeller 20 is driven by the rotating assembly to rotate, so that water in the water inlet chamber 12 is pumped into the water pumping chamber 11 through the through hole 131, and at this time, part of water in the water pumping chamber 11 flows out of the water outlet hole 132 to the water inlet chamber 12. In the process that water flows through the water discharging hole 132, water flows through the bent channel 31 of the throttle 30 in the water discharging hole 132, and because the bent channel 31 is set to be in a bent state, the water flow can touch the bent inner wall of the bent channel 31 when entering the bent channel 31, so that the flow rate of the flowing water is effectively reduced, and cavitation damage caused by overhigh flow rate, overhigh static pressure and overlow static pressure is avoided; when the water pump 1 stops working, the impeller 20 stops rotating, and the water left in the pressurized-water chamber 11 is discharged into the water inlet cavity 12 through the through hole 131 and the water discharge hole 132, so that the impeller 20 is prevented from being damaged by the water left in the pressurized-water chamber 11.

According to the water pump 1 provided by the embodiment, the water discharge hole 132 is formed, so that water in the pressurized water chamber 11 can be effectively discharged into the water inlet cavity 12 after the water pump 1 stops working, and the impeller 20 is prevented from being damaged by residual water in the pressurized water chamber 11; in addition, the throttle member 30 with the bent channel 31 is arranged in the water discharge hole 132, so that the flow velocity of the water flow flowing through the bent channel 31 can be effectively reduced when the water pump 1 works, thereby avoiding cavitation damage caused by over-high flow velocity and over-low static pressure, and effectively improving the cavitation resistance of the water discharge hole 132.

Various possible configurations and implementations of the water pump 1 are described in detail below.

Alternatively, the orifice member 30 includes a first pipe section 32 and a second pipe section 33, the first pipe section 32 and the second pipe section 33 communicate with each other to form the bending passage 31, and the first pipe section 32 and the second pipe section 33 are arranged perpendicular to each other.

Wherein the throttle 30 comprises a first pipe section 32 and a second pipe section 33, and the first pipe section 32 and the second pipe section 33 are arranged perpendicular to each other. At this time, the first pipe section 32 and the second pipe section 33 are communicated with each other to form the bending channel 31, and the bending channel 31 is also vertically arranged corresponding to the first pipe section 32 and the second pipe section 33. The high pressure water introduced into the bent passage 31 is effectively blocked by the other vertical passage side wall, thereby effectively reducing the flow rate of the water flowing through the bent passage 31.

Optionally, the meandering channel 31 has a first opening 311 and a second opening 312, the first opening 311 and the second opening 312 being oriented differently. Wherein, the first opening 311 and the second opening 312 are disposed to communicate with both ends of the bending channel 31, so as to guide the high-pressure water from one end opening to the other end opening. Alternatively, a first opening 311 is provided in the first pipe section 32 and is oriented toward the pumping chamber 11, and a second opening 312 is provided at one end of the second pipe section 33 and extends into the intake chamber 12. When the water pump works, high-pressure water enters the bent channel 31 from the first opening 311, and enters the pumping chamber 11 from the second opening 312 after the flow speed of the high-pressure water is reduced through the bent channel; when the water pump stops working, the water flow enters the bent channel 31 through the first opening 311 and is discharged to the water inlet cavity 12 through the second opening 312.

When the impeller 20 rotates during the operation of the water pump, the water in the pumping chamber 11 is driven to flow in one direction. As shown in fig. 2, the end of the first pipe section 32 having the first opening 311 is optionally disposed toward the water flow direction of the pumping chamber 11.

The first pipe section 32 and the second pipe section 33 are vertically arranged, the second pipe section 33 is inserted into the water discharge hole 132, and the end of the first pipe section 32 having the first opening 311 is arranged toward the water flow direction of the pumping chamber 11, so that the water flow driven by the rotation of the impeller 20 does not flow into the bent passage 31 too much.

Optionally, the outer wall of the first tube section 33 has an arcuate projection 331 disposed axially about the first opening 311. Since the first pipe section 33 is arranged toward the water flow direction of the pumping chamber 11, the water flow passes through the arc-shaped protrusion 331 when passing through the first pipe section 33. According to the theory of the hydrodynamic boundary layer, when fluid flows through the spherical structure, the flow of the water flows around the spherical structure, and the flow speed is increased and then reduced. At this time, the flow velocity of the water flow decreases as the water flow passes through the arc-shaped protrusion 331. In order to further improve the flow rate reducing effect of the arc-shaped protrusion 331, optionally, the arc-shaped protrusion 331 is a ball head, and the first opening 311 is located on the ball head. The arc-shaped protrusion 331 is a ball head, and the first opening 311 is disposed on the ball head, that is, the arc-shaped protrusion is disposed on an outer sidewall of the first pipe section 32 around the first opening 311 in the axial direction. When water flows through the ball head, according to the bernoulli equation, the water pressure at the spherical surface is reduced and then increased, and because the boundary layer viscous resistance is generated at the spherical surface, energy loss and pressure drop are generated in the water pressure increasing process, reverse pressure difference is generated to generate backflow, and the backflow generates vortex by being in opposite impact with forward flow, so that the water flow is inhibited from flowing into the first opening 311.

On the other hand, according to the "coanda effect", when the water flow flows through the spherical surface, the water flow direction changes to flow along the spherical surface, and the water flow collides with the water flow flowing into the first opening 311 in the pumping chamber 11 to generate a vortex, so that the water flow is further inhibited from flowing into the first opening 311, the vaporization of the liquid in the first opening 311 is inhibited by reducing the flow speed of the water at the first opening 311, the cavitation problem of the water discharge hole is fundamentally solved, and the cavitation resistance of the water discharge hole 132 is effectively improved.

In the water pump 1, in order to prevent water in the pressurized-water chamber 11 from freezing, an antifreeze is generally introduced into the pressurized-water chamber 11. When the antifreeze is replaced, the old antifreeze is not discharged, and the service life of the new antifreeze is influenced. In order to discharge the liquid in the pumping chamber 11 as much as possible, the drain hole 132 is optionally opened at the bottom of the baffle 13, that is, the liquid in the pumping chamber 11 can be discharged as much as possible.

Optionally, the water inlet cavity 12 is arranged on the pressurized water chamber 11, the rotating assembly 40 is arranged on one side of the pressurized water chamber 11, which is far away from the water inlet cavity 12, and one end of the rotating assembly 40 extends into the pressurized water chamber 11 and is coaxially connected with the impeller 20. The rotating assembly 40 includes a rotating shaft 41 and a sealing seat 42, the sealing seat 42 is hermetically connected to the pumping chamber 11, the rotating shaft 41 is disposed in the sealing seat 42 and connected to the impeller 20, and the rotating shaft 41 is driven by an external driving member to rotate, so as to drive the impeller 20 to rotate.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water pump is characterized by comprising a pump body and an impeller, wherein a water pressurizing chamber and a water inlet cavity are arranged in the pump body, a baffle is arranged between the water pressurizing chamber and the water inlet cavity, a through hole is formed in the baffle to communicate the water pressurizing chamber with the water inlet cavity, the impeller is installed in the water pressurizing chamber, and the impeller and the through hole are coaxially arranged;

a water drainage hole is formed in one side of the baffle, a throttling piece is inserted into the water drainage hole, and the throttling piece is provided with a bent channel for communicating the water pumping chamber of the water pump with the water inlet cavity;

the throttling element comprises a first pipe section and a second pipe section, the first pipe section and the second pipe section are communicated with each other to form the bending channel, and the first pipe section and the second pipe section are arranged vertically to each other; the bent channel is provided with a first opening and a second opening, and the first opening and the second opening are in different directions; the first opening is arranged on the first pipe section and faces the water pumping chamber, and the second opening is arranged at one end of the second pipe section and extends into the water inlet cavity; the end, provided with the first opening, of the first pipe section is arranged towards the water flow direction of the water pumping chamber.

2. The water pump of claim 1, wherein the first segment outer side wall has an arcuate projection thereon.

3. The water pump of claim 2, wherein the arcuate projection is a ball head, and the first opening is located on the ball head.

4. The water pump of claim 1, wherein the water discharge hole is opened at a bottom of the baffle.

5. The water pump of claim 1, further comprising a rotating assembly, wherein the rotating assembly is arranged on a side of the pressurized water chamber away from the water inlet cavity, and one end of the rotating assembly extends into the pressurized water chamber and is coaxially connected with the impeller.

6. The water pump of claim 5, wherein the rotating assembly comprises a rotating shaft and a sealing seat, the sealing seat is connected with the pumping chamber in a sealing manner, and the rotating shaft is arranged in the sealing seat and connected with the impeller.