CN218669953U

CN218669953U - Cavitation-resistant water pump

Info

Publication number: CN218669953U
Application number: CN202221705105.3U
Authority: CN
Inventors: 孙传利; 王有为; 王泽刚
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2023-03-21
Anticipated expiration: 2032-07-04

Abstract

The application discloses anti cavitation's water pump belongs to engine water pump technical field, and the water pump is including having the pump body and the impeller of crossing the hydroecium, and the pump body is equipped with the baffle that will cross the hydroecium and separate for pressurized-water chamber and intake antrum, and the baffle is equipped with the through-hole that will press water chamber and intake antrum intercommunication, and the impeller is located the pressurized-water intracavity, is formed with the backward flow clearance between impeller and the baffle, and the width in backward flow clearance is crescent to the direction that is close to impeller axis of revolution. The width of the backflow gap is set to be gradually increased towards the direction close to the impeller revolution axis, so that when water in the pressurized water cavity is driven to flow by the impeller, the flow velocity at the corner of the backflow gap is reduced, the pressure at the position is reduced compared with the flow pressure change far away from the impeller revolution axis, the pressure difference between the pressure at the inner ring of the backflow gap and the water inlet cavity is reduced, further cavitation is inhibited, cavitation bubbles are eliminated fundamentally, and cavitation damage to the partition plate caused by overhigh flow velocity, overhigh static pressure and overlow static pressure is avoided.

Description

Cavitation-resistant water pump

Technical Field

The application belongs to the technical field of engine water pumps, especially, relate to a water pump of anti cavitation.

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.

The existing water pump generally comprises a pump body and an impeller, wherein the pump body is provided with a water chamber, the water chamber is divided into a water pressing cavity and a water inlet cavity by a partition plate, the partition plate is provided with a through hole for communicating the water pressing cavity with the water inlet cavity, the impeller is positioned in the water pressing cavity, a backflow gap is formed between the impeller and the partition plate, an inner ring and an outer ring of the backflow gap are the positions with the largest pressure difference of the whole cooling system, the flow area of the backflow gap is small, the flow rate of the backflow gap is extremely high, the flow rate is higher when the backflow gap is closer to the inner ring, the flow rate is drastically changed when water flows into the water inlet cavity through the partition plate, the static pressure in the gap is sharply reduced, cavitation bubbles are generated, and are subjected to hydraulic impact collapse at the turning part of the partition plate, cavitation damage to the partition plate is generated, and the service life of the water pump is seriously shortened.

SUMMERY OF THE UTILITY MODEL

The application provides a water pump of anti cavitation to solve prior art problem well baffle and easily receive the technical problem that the cavitation destroyed.

The technical scheme adopted by the application is as follows:

the utility model provides an anti-cavitation water pump, is including the pump body and the impeller that have the hydroecium, the pump body be equipped with the hydroecium separates for the baffle of pressurized-water chamber and intake antrum, just the baffle be equipped with the pressurized-water chamber with the through-hole of intake antrum intercommunication, the impeller is located the pressurized-water intracavity, the impeller with be formed with the backward flow clearance between the baffle, the width in backward flow clearance is to being close to the direction of impeller axis of rotation increases gradually.

The anti-cavitation water pump in the present application also has the following additional technical features:

the baffle plate is provided with an inner side wall facing the impeller, and the inner side wall inclines towards the direction far away from the impeller along with the reduction of the diameter of the baffle plate so as to gradually increase the backflow gap.

The inner side wall and the included angle alpha of the radial plane of the clapboard meet the following requirements: alpha is more than or equal to 3 degrees and less than or equal to 15 degrees.

The side wall of the impeller facing the baffle plate is inclined towards the direction far away from the baffle plate along with the reduction of the diameter of the impeller, so that the backflow gap is gradually increased.

The baffle includes the orientation the inside wall of impeller and with the through hole wall that the inside wall is connected, the inside wall with through the fillet transition between the through hole wall.

The radius r of the fillet is more than or equal to 2mm and less than or equal to 5mm.

A water drainage hole is formed in one side of the partition plate, a throttling piece is inserted into the water drainage hole and provided with a bent channel communicated with the water pressing cavity and the water inlet cavity.

The water discharge hole is formed in the bottom of the partition plate.

Due to the adoption of the technical scheme, the beneficial effects obtained by the application are as follows:

1. this application sets up to being close to through the width with the backward flow clearance between impeller and the baffle the direction of impeller axis of revolution gradual increase's form for the impeller is when driving the rivers of pressurized-water intracavity and flows, the water in the backward flow clearance is more close to the capacity of impeller axis of revolution water more, and then reduced the velocity of flow of backward flow clearance corner, so that the pressure that makes this department compares the rivers pressure variation of keeping away from impeller axis of revolution department and reduces, reduce the pressure differential between backward flow clearance inner circle department pressure and the intake antrum, and then restrain the cavitation and take place, eliminate the cavitation bubble from the root, avoid the too high static pressure of velocity of flow to hang down the cavitation destruction to the baffle, the life of extension water pump.

2. As a preferred embodiment of the present application, the partition board is arranged to have an inner side wall facing the impeller, the inner side wall is inclined towards the direction away from the impeller along with the reduction of the diameter of the partition board, so that the backflow gap is gradually increased, the formation of the backflow gap is realized, the partition board is gradually extended towards the direction away from the impeller, the backflow gap is gradually changed to realize stable flow velocity, the sharp change of pressure is eliminated, the cavitation is further inhibited, and the bubbles are radically eliminated.

3. As a preferred embodiment of the present application, by setting the included angle α between the inner side wall and the radial plane of the partition plate to satisfy: alpha is more than or equal to 3 degrees and less than or equal to 15 degrees, and the condition that the flow velocity is larger and the pressure is too small at the position to generate bubbles because the inner ring backflow gap cannot realize the reduction of the flow velocity due to the fact that the included angle between the inner side wall and the radial plane of the partition plate is too small is avoided; meanwhile, the condition that the inner side wall and the included angle of the radial plane of the partition plate are too large to cause that the parts in the pump body are not compact enough to cause the integral water pump body to be too large is avoided.

4. As a preferred embodiment of this application, through set up between the inside wall of baffle and the through-hole wall through the fillet transition for backflow clearance at backward flow corner further increases, increases backflow clearance corner flow area, thereby further reduces the corner velocity of flow, reduces because of the fluid flow direction changes the hydraulic shock that arouses, has weakened the destructive power of hydraulic shock to the baffle. And the fillet setting can effectively reduce blockking to rivers, and then reduces the rivers impact.

5. As a preferred embodiment of the application, the water discharge hole is formed in the partition plate, so that water in the water pressing cavity can be effectively discharged into the water inlet cavity after the water pump stops working, and the impeller is prevented from being damaged by water reserved in the water pressing cavity; 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, the cavitation resistance of the water drainage hole is effectively improved, the cavitation resistance of the water pump is further improved, and the service life of the water pump is prolonged.

6. As a preferred embodiment of the application, the water discharge hole is formed in the bottom of the partition plate, so that liquid in the pressurized water cavity is discharged as much as possible, and the impeller is further prevented from being damaged by reserved water in the pressurized water cavity.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a cross-sectional view of a water pump according to one embodiment of the present application;

fig. 2 is an enlarged view of a portion a in fig. 1.

Wherein the content of the first and second substances,

1-pump body, 11-water pressing cavity, 12-water inlet cavity, 13-clapboard, 131-inner side wall, 132-through hole wall and 133-fillet; 3-overcurrent gap.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like refer to orientations or positional relationships illustrated in the drawings, which are used for convenience in describing the present application and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the present application.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In an embodiment of the present application, an anti-cavitation water pump is provided. For ease of illustration and understanding, the following description is provided in the context of a product architecture based on the drawings. Of course, it is understood by those skilled in the art that the above-described structure is only used as a specific example and illustrative illustration, and does not constitute a specific limitation to the technical solution provided by the present application.

As shown in fig. 1 and 2, the application provides a water pump of anti cavitation, including pump body 1 and the impeller that has the hydroecium, pump body 1 be equipped with the hydroecium is separated for the baffle 13 of pressurized water chamber 11 and intake antrum, just baffle 13 be equipped with pressurized water chamber 11 with the through-hole of intake antrum intercommunication, the impeller is located in pressurized water chamber 11, the impeller with be formed with backflow clearance 3 between the baffle 13, backflow clearance 3's width to being close to impeller axis of revolution's direction increases gradually.

This application sets up to being close to through the width with backflow clearance 3 between impeller and the baffle 13 impeller axis of revolution's direction progressively increasing form for when the water that the impeller was in driving pressure water cavity 11 flows, the water in the backflow clearance 3 is more close to the capacity of impeller axis of revolution water more, and then reduced the velocity of flow of backflow clearance 3 corners, so that the pressure that makes this department compares the rivers pressure variation who keeps away from impeller axis of revolution department and reduces, reduce the pressure differential between 3 inner circles department pressures of backflow clearance and intake antrum 12, and then restrain the cavitation and take place, eliminate the cavitation bubble from the root, avoid the too high static pressure of velocity of flow to hang down the cavitation destruction to baffle 13, the life of extension water pump.

Note that, in the present application, the formation manner of the backflow gap 3 is not particularly limited, and may be any one of the following embodiments:

example 1: as shown in fig. 2, in this embodiment, the partition 13 has an inner sidewall 131 facing the impeller, and the inner sidewall 131 is inclined in a direction away from the impeller as the diameter of the partition 13 is reduced, so that the backflow gap 3 is gradually increased.

The baffle 13 is arranged to have the inner side wall 131 facing the impeller, the inner side wall 131 inclines towards the direction far away from the impeller along with the reduction of the diameter of the baffle 13, so that the backflow gap 3 is gradually increased, the formation of the backflow gap 3 is realized, the baffle 13 gradually extends towards the direction far away from the impeller, the backflow gap 3 is gradually changed, the stable flow rate is realized, the sharp change of pressure is eliminated, the cavitation is further inhibited, and the bubbles are eliminated from the root.

It should be further noted that, the included angle between the inner sidewall 131 and the radial plane of the partition plate 13 is not specifically limited in the present application, and as a preferred aspect of the present application, the included angle α between the inner sidewall 131 and the radial plane of the partition plate 13 satisfies: alpha is more than or equal to 3 degrees and less than or equal to 15 degrees.

By setting the angle α of the inner side wall 131 to the radial plane of the partition 13 to satisfy: alpha is more than or equal to 3 degrees and less than or equal to 15 degrees, and the condition that the flow velocity is reduced and the pressure is too small at the position to generate bubbles because the included angle between the inner side wall 131 and the radial plane of the partition plate 13 is too small so that the inner ring backflow gap 3 cannot realize flow velocity reduction is avoided; meanwhile, the situation that the inner wall 131 and the radial plane of the partition plate 13 form an excessively large included angle to cause the fact that the parts in the pump body 1 are not compact enough to cause the volume of the whole water pump body 1 to be excessively large is avoided.

Example 2: in this embodiment, the side wall of the impeller facing the partition 13 is inclined in a direction away from the partition 13 as the diameter of the impeller is reduced, so that the return gap 3 is gradually increased.

As a preferred embodiment of the present application, as shown in fig. 2, the partition 13 includes an inner sidewall 131 facing the impeller and a through hole wall 132 connected to the inner sidewall 131, and the inner sidewall 131 and the through hole wall 132 are transited by a fillet 133.

Through set up between the inside wall 131 of baffle 13 and through-hole wall 132 and pass through fillet 133 transition for backflow clearance 3 at backward flow corner further increases, increases backflow clearance 3 corner flow area, thereby further reduces the corner velocity of flow, reduces because of the fluid flow direction changes the hydraulic shock that arouses, has weakened the destructive power of hydraulic shock to baffle 13. And fillet 133 sets up can effectively reduce blockking to rivers, and then reduces the rivers impact. Of course, the position is not limited to the round corner 133, but it may be a bevel angle.

It should be noted that, the radius of the rounded corner 133 is not specifically limited in the present application, and as a preferred choice of the present application, the radius r of the rounded corner 133 satisfies 2mm ≦ r ≦ 5mm.

The radius of the fillet 133 is set to meet the requirement that r is more than or equal to 2mm and less than or equal to 5mm, so that the condition that the flow velocity of water flow is still large and further hydraulic impact destructive power on the partition plate 13 is still large due to the fact that the backflow gap 3 at the corner is not obviously increased due to the fact that the radius of the fillet 133 is too small is avoided; meanwhile, the situation that the thickness of the partition plate 13 becomes thinner due to the excessively large radius of the fillet 133, the strength becomes lower, and deformation is easily caused is avoided.

As a preferred embodiment of the present application, a water discharge hole is formed in one side of the partition plate 13, a throttle member is inserted into the water discharge hole, and the throttle member has a bent channel for communicating the water pressing cavity 11 and the water inlet cavity.

The water discharge hole is formed in the partition plate 13, so that water in the water pressing cavity 11 can be effectively discharged into the water inlet cavity 12 after the water pump stops working, and the impeller is prevented from being damaged by residual water in the water pressing cavity 11; 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, the cavitation resistance of the water drainage hole is effectively improved, the cavitation resistance of the water pump is further improved, and the service life of the water pump is prolonged.

In the present application, the opening position of the water discharge hole is not particularly limited, and as a preferred embodiment of the present application, the water discharge hole is formed in the bottom of the partition plate 13.

The water discharge hole is formed in the bottom of the partition plate 13, so that liquid in the water pressing cavity 11 is discharged as much as possible, and the impeller is further prevented from being damaged by residual water in the water pressing cavity 11.

Where not mentioned in this application, can be accomplished using or referencing existing technology.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. The utility model provides an anti cavitation's water pump, its characterized in that, is including the pump body and the impeller that have the hydroecium, the pump body be equipped with cross the hydroecium and separate for the baffle of pressurized-water chamber and intake antrum, just the baffle be equipped with the pressurized-water chamber with the through-hole of intake antrum intercommunication, the impeller is located the pressurized-water intracavity, the impeller with be formed with the backward flow clearance between the baffle, the width in backward flow clearance to being close to the direction of impeller axis of revolution increases gradually.

2. A cavitation resistant water pump as claimed in claim 1, wherein the baffle has an inner side wall facing the impeller, the inner side wall being inclined away from the impeller as the diameter of the baffle decreases so that the return gap progressively increases.

3. An anti-cavitation water pump as claimed in claim 2, wherein the inner side wall is at an angle α to the radial plane of the diaphragm which satisfies: alpha is more than or equal to 3 degrees and less than or equal to 15 degrees.

4. A cavitation resistant water pump as claimed in claim 1, wherein the side wall of the impeller towards the diaphragm is inclined away from the diaphragm as the diameter of the impeller decreases so that the return gap progressively increases.

5. An anti-cavitation water pump according to claim 1, wherein the diaphragm includes an inner side wall facing the impeller and a through hole wall connected to the inner side wall, the inner side wall and the through hole wall being in rounded transition.

6. The cavitation-resistant water pump as recited in claim 5, characterized in that the radius r of the fillet satisfies 2mm ≦ r ≦ 5mm.

7. The cavitation-resistant water pump as recited in claim 1, wherein a water discharge hole is formed in one side of the partition plate, a throttle member is inserted into the water discharge hole, and the throttle member has a bent passage communicating the water pressing chamber and the water inlet chamber.

8. The cavitation-resistant water pump as recited in claim 7, wherein the water discharge hole is formed in a bottom portion of the partition.