CN211975424U

CN211975424U - Low-cavitation-allowance immersed pump

Info

Publication number: CN211975424U
Application number: CN202020229291.2U
Authority: CN
Inventors: 翟鲁涛; 岳军; 宗秀山
Original assignee: Zibo Boshan Lvyuan Gas Equipment Co ltd
Current assignee: Zibo Boshan Lvyuan Gas Equipment Co ltd
Priority date: 2020-02-29
Filing date: 2020-02-29
Publication date: 2020-11-20
Anticipated expiration: 2030-02-28

Abstract

The utility model relates to a low cavitation surplus immersed pump belongs to low temperature liquid conveying equipment technical field. The utility model provides a higher problem of cavitation surplus that exists when current immersed pump carries low temperature liquid. The utility model discloses an immersed pump main part still includes: the suction end is arranged at the lower part of the immersed pump main body and comprises a suction end base on the outer side, a central shaft is arranged in the middle of the suction end base, and an impeller, a flow guide body and an inducer are sequentially sleeved on the outer side of the central shaft corresponding to the suction end from top to bottom.

Description

Low-cavitation-allowance immersed pump

Technical Field

The utility model relates to a low cavitation surplus immersed pump belongs to low temperature liquid conveying equipment technical field.

Background

When the pump works, liquid can generate steam at the inlet of the impeller under certain vacuum pressure, vaporized bubbles generate ablation on the surfaces of metal such as the impeller and the like under the impact motion of liquid particles so as to destroy the metal such as the impeller and the like, the vacuum pressure is called vaporization pressure at the moment, and the residual amount of the steam erosion refers to surplus energy which exceeds the vaporization pressure and is contained in unit weight of the liquid at the pumping inlet of the pump.

Cryogenic liquids such as liquid nitrogen and liquefied natural gas are characterized by low temperature (liquid nitrogen is-196 ℃ under atmospheric pressure and liquefied natural gas is-162 ℃), danger, easy gasification and the like, and are often used as immersed pumps when being transported. In order to avoid the gasification of liquid in the pump, the immersed pump needs a certain back-flow liquid level when in operation.

In the conventional immersed pump, an inducer is arranged in front of an inlet of an impeller, and the inducer is of a spiral structure with equal pitch, so that the immersed pump has better suction performance. However, the inducer of the structure has small generated lift; the liquid flowing out from the inducer flows into the impeller while rotating, and the inducer with the structure has a high cavitation margin in reducing the pump because the proportion of kinetic energy and the proportion of pressure energy in the liquid energy are large and small.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome the above-mentioned defect that current immersed pump exists, provided a low cavitation surplus immersed pump, eliminate the inducer through the baffle and bring the rotatory impact force for carrying liquid to convert it to vertical pressure, reduce the impact to the impeller, and for the impeller provides pressure, realized the requirement of the low cavitation surplus of immersed pump.

The utility model discloses an adopt following technical scheme to realize:

the utility model provides a low cavitation surplus immersed pump, includes the immersed pump main part, still includes:

the suction end is arranged at the lower part of the immersed pump main body and comprises a suction end base on the outer side, a central shaft is arranged in the middle of the suction end base, and an impeller, a flow guide body and an inducer are sequentially sleeved on the outer side of the central shaft corresponding to the suction end from top to bottom.

The liquid to be transmitted is sucked by the suction end at the lower part of the immersed pump main body, the inducer provides rotary power, the liquid is guided to enter the impeller by the guide body to be continuously pressurized and transmitted, and the guide body can guide the liquid to eliminate the rotary power.

Preferably, the guide body is communicated with the inducer at the suction end and the impeller through the guide channel, and the liquid to be transmitted is transmitted to the impeller from the inducer;

the guide body transmits liquid through a plurality of groups of guide channels, guide blades are arranged in the guide channels of the guide body, the lower parts of the guide blades are opposite to the spiral direction of the inducer, and the guide blades extend from bottom to top to be vertical to the top.

Preferably, the helical blade of the inducer is of a variable-pitch helical structure, and the inducing shaft on the inner side becomes thicker from bottom to top so as to provide pressurization for the liquid to be transmitted. The proportion of kinetic energy and pressure energy in the liquid energy is smaller, and the cavitation amount is more effectively reduced.

Preferably, the outer side of the central shaft and the middles of the impeller, the flow guide body and the inducer are further sleeved with shaft sleeves. The setting of axle sleeve can effectual reduction liquid to the impact of center pin, better protection center pin.

The utility model has the advantages that:

(1) low cavitation surplus immersed pump, be provided with the baffle, eliminate the revolving force of transmission liquid through the baffle and convert it to pressure, provide lower cavitation volume for the continuation of impeller for liquid is carried, improve conveying efficiency.

(2) Low cavitation surplus immersed pump, the inducer is for carrying the liquid pressure boost through variable pitch structure, the suction performance is good, the lift is high, compare liquid with the equal pitch inducer of equal model and can get into the inducer and obtain more energy under very little liquid level of flowing backward.

(3) Low cavitation surplus immersed pump, the water conservancy diversion body turns into vertical pressure through the revolving force that the guide vane of water conservancy diversion passageway will carry liquid, is convenient for reduce the cavitation volume.

Drawings

Fig. 1 is a front view of an embodiment of the present invention;

in the figure: 1. a suction end base; 2. an inducer; 3. a flow conductor; 4. a shaft sleeve; 5. an impeller; 6. a central shaft; 7. a guide vane.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, the immersed pump with low cavitation residual capacity, the immersed pump main body, further comprises:

the submerged pump is characterized in that the suction end is arranged at the lower part of the submerged pump main body and comprises a suction end base 1 on the outer side, a central shaft 6 is arranged in the middle of the suction end base 1, and an impeller 5, a flow guide body 3 and an inducer 2 are sequentially sleeved on the outer side of the central shaft 6 corresponding to the suction end from top to bottom.

Preferably, the guide body 3 is communicated with the inducer 2 and the impeller 5 at the suction end through a guide channel, and the liquid to be transmitted is transmitted from the inducer 2 to the impeller 5;

the guide body 3 transmits liquid through a plurality of groups of guide channels, guide vanes 7 are arranged in the guide channels of the guide body 3, the lower parts of the guide vanes 7 are opposite to the spiral direction of the inducer 2, and the guide vanes 7 extend from bottom to top to be vertical to the top.

Preferably, the helical blade of the inducer 2 is of a variable pitch helical structure, and the inducing shaft on the inner side becomes thicker from bottom to top, so as to provide pressurization for the liquid to be conveyed.

Preferably, a shaft sleeve 4 is further sleeved outside the central shaft 6 and between the impeller 5, the flow guide body 3 and the inducer 2.

The utility model discloses a use as follows:

a flow guide body 3 is fixedly arranged in the suction end base 1, and a flow guide vane 7 is arranged in the flow guide body 3. When the liquid flowing out of the inducer flows through the guide body 3, the rotation of the liquid is gradually eliminated due to the guide of the guide vanes 7, the part of kinetic energy is converted into pressure energy, the inlet pressure of the impeller 5 can be further increased, and the cavitation allowance of the pump is greatly reduced.

The utility model discloses mainly apply to the place that the immersed pump carries out low temperature liquid and carry out.

Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.

Claims

1. The utility model provides a low cavitation surplus immersed pump, includes the immersed pump main part, its characterized in that still includes:

the submerged pump is characterized in that the suction end is arranged at the lower part of the submerged pump main body and comprises a suction end base (1) on the outer side, a central shaft (6) is arranged in the middle of the suction end base (1), and an impeller (5), a flow guide body (3) and an inducer (2) are sequentially sleeved on the outer side of the central shaft (6) corresponding to the suction end from top to bottom.

2. The low cavitation margin immersed pump according to claim 1, characterized in that: the guide body (3) is communicated with the inducer (2) and the impeller (5) at the suction end through a guide channel, and liquid to be transmitted is transmitted to the impeller (5) from the inducer (2);

the guide body (3) transmits liquid through a plurality of groups of guide channels, guide vanes (7) are arranged in the guide channels of the guide body (3), the lower parts of the guide vanes (7) are opposite to the spiral direction of the inducer (2), and the guide vanes (7) extend from bottom to top to be vertical to the top.

3. The low cavitation margin immersed pump according to claim 2, characterized in that: the spiral blade of the inducer (2) is of a variable-pitch spiral structure, and the inner inducing shaft becomes thicker from bottom to top, so that pressurization is provided for liquid to be conveyed.

4. A low cavitation margin submersible pump as claimed in any one of claims 1 to 3, wherein: the outer side of the central shaft (6) and the middles of the impeller (5), the flow guide body (3) and the inducer (2) are also sleeved with a shaft sleeve (4).