CN210153003U

CN210153003U - Air lift pump

Info

Publication number: CN210153003U
Application number: CN201920390579.5U
Authority: CN
Inventors: 瓦埃勒·阿哈姆德
Original assignee: University of Guelph
Current assignee: University of Guelph
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-03-17
Anticipated expiration: 2029-03-26

Abstract

A pump has a standpipe having a lower portion, an upper portion, and an intermediate portion, the intermediate portion having a cross-sectional area smaller than the upper portion, the lower portion having a diameter D. The lifting device comprises: n2 ports on the lower portion, each port having a diameter E, the ports also having a distal end located on the lower portion and extending horizontally away from the distal end. The injector has a tip at the top of the middle portion and extends vertically downward, the tip being defined by a cylindrical recess of thickness B. The annular cavity surrounds the eductor, has a length a, and communicates with the eductor through a row of N1 holes spaced a distance F from the junction of the transition portion and the intermediate portion, each hole having a diameter C. Expressed in millimeters, then: d is between about 25.4 and 203.2; b ≈ 0.521(D)^0.296；C≈1.918(D)^0.343；E≈0.521(D)^0.296；F≈0.321D‑3.41。

Description

Air lift pump

Technical Field

The utility model relates to an air lift pump field.

Background

It is well known to move fluid material (liquid or solid-liquid mixture) through a vertical pipe by introducing compressed air in the lower part of the vertical pipe partially immersed in the fluid material.

SUMMERY OF THE UTILITY MODEL

A pump forming an aspect of the invention, for use with a supply of working fluid and a supply of fluid material having a higher density than the working fluid, comprises a vertically extending conduit, and a lifting device.

The vertically extending conduit is in use immersed in a supply of fluid material. The vertically extending conduit has a lower portion, an upper portion, and an intermediate portion between the lower portion and the upper portion. The cross-sectional area of the middle portion is smaller than the cross-sectional area of the upper portion, the lower portion has a diameter D, and the middle portion has a diameter D.

The lift device includes an array of N2 ports, an injector, and a toroidal cavity.

The array is arranged over the length of the lower portion. Each port of the array has a diameter E, each port further includes a distal end at the lower portion, and each port extends horizontally away from the distal end such that the working fluid is directed toward the center of the catheter.

The ejector has a tip at the top of the middle portion and extends vertically downward such that the working fluid is directed vertically upward, the tip of the ejector being defined by a cylindrical slot of thickness B.

An annular cavity surrounds the eductor. The annular chamber has a length A and communicates with the eductor through a row of N1 orifices. The row of N1 holes is spaced a distance F from the junction of the transition portion and the intermediate portion, and each hole has a diameter C.

If B, C, D, E and F are expressed in millimeters, then

D is between about 25.4 and 203.2

B≈0.521(D)^0.296

C≈1.918(D)^0.343

E≈0.521(D)^0.296

F≈0.321D-3.41

According to another aspect of the invention, D, a, B, C, D, E, F, N1, and N2 may be sized according to any one of the following geometries:

according to another aspect of the invention, the pump can be used with air as the working fluid and water as the fluid material.

According to another aspect of the invention, in use, the combination of airflow, water flow and geometry can fall substantially into a situation consistent with any combination of:

combination of	Air flow (m)³/S)	Water flow (m)³/S)
			1	0.00023-0.00027	0.0002-0.004
2	0.0002-0.0018	0.0005-0.0007
			3	0.00115-0.01	0.0025-0.0037
4	0.006-0.025	0.006-0.017
			5	0.008-0.05	0.011-0.015

The advantages, features and characteristics of the present invention will become apparent from a reading of the following detailed description and a review of the associated drawings. The drawings will be briefly described below.

Drawings

FIG. 1 is a cross-sectional view of a pump constructed in accordance with an exemplary embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along L-L of FIG. 1;

FIG. 3 is a cross-sectional view of a pump constructed in accordance with another exemplary embodiment of the present invention;

FIG. 4 illustrates the aeration performance of a pump according to one embodiment of the present invention; and

fig. 5 shows the aeration performance of a pump according to another embodiment of the present invention.

Detailed Description

A pump 20 according to an exemplary embodiment of the present invention is shown in fig. 1 and 2.

It will be appreciated that the pump 20 is of the type used with a supply of working fluid and a supply of fluid material having a higher density than the working fluid, neither the working fluid nor the fluid material being shown. And it will be seen that the pump 20 includes an annular conduit 22 and a lifting device 24.

In use, the conduit 22 is vertically extending and has: a circular inlet 26; a cylindrical lower portion 28 communicating with the inlet and having a diameter D smaller than the diameter of the inlet; a frustoconical transition 30 communicating with the lower portion and tapering as it extends at an angle from the lower portion; an intermediate portion 32 communicating with the transition portion 30 and having a diameter d; a bridge portion 34 communicating with the intermediate portion 32 and having a larger diameter than the intermediate portion 32; and an upper portion 36.

The diameter of the inlet 26 and the diameter of the upper portion 36 are understood to be sized to accommodate a conventional pipe (not shown) having an inner diameter D.

The lift 24 includes an array 38 of ports 40 and an injector 42.

Each port of the array has an end 44 in the lower portion 28. Each port has a diameter E and extends horizontally away from the tip 44 such that the working fluid is directed toward the center of the catheter (not shown). The total number of ports 40 is N2.

The injectors 42 are disposed at the junction of the intermediate portion 32 and the bridge portion 34. The injector 42 has an annular tip with a radial thickness B and extends vertically downward a distance a such that the working fluid is directed vertically upward.

An annular chamber 46 surrounds the eductor 42 and communicates therewith through a row of orifices 48, each orifice 48 having a diameter. The row of holes 48 is spaced a distance F from the junction of the transition portion 30 and the intermediate portion 32. The total number of holes 48 is N1.

Another annular chamber 50 surrounds the lower portion 28 and communicates with the ports 40. Those of ordinary skill in the art will readily appreciate that, in use, a gas, such as air, is introduced into the

chambers

46, 50 to enter the fluid material through the lifting device 24.

As a feature of the pump, if B, C, D, E and F are expressed in millimeters:

d is between about 25.4 and 203.2

B≈0.521(D)^0.296

C≈1.918(D)^0.343

E≈0.521(D)^0.296

F≈0.321D-3.41

More specifically, D, A, B, C, D, E, F, N1, and N2 may be determined according to any one of the geometries listed in Table 1:

TABLE 1

The pumps shown in fig. 1 and 2 are to be understood as being easily constructed by means of three-dimensional printing using conventional methods. This is not essential, however, and the pump can also be easily constructed by conventional machining as shown in fig. 3.

Five versions of the pump of the present invention were constructed according to each geometry.

These five pumps were tested and the results are listed in table 2 below:

TABLE 2

For more certainty, in table 2, the "immersion ratio" is the ratio of the liquid-filled riser section to the total length of the pipe, and the "immersion head" is the liquid-filled pipe section. One of ordinary skill in the art will readily recognize that the pump is capable of pumping relatively large amounts of water relatively efficiently.

As shown in fig. 4, the aeration performance of the 101.6mm pump was tested. The test involves pumping the water in the tank on a cyclical basis. Three tests were performed. In each test, the water in the tank was exposed to the atmosphere for a sufficient time to allow the oxygen concentration to equilibrate at 1 mg/L. In each test, a constant volumetric flow of gas was forced through the pump. In the first test, 75% of the flow was directed through the lower array and 25% of the flow was directed through the upper array. In the second test, the flow was split into 50: 50. In the third test, 25% of the flow was directed through the lower array and 75% of the flow was directed through the upper array. Figure 4 shows that by forcing more flow through the lower array, the oxidation is increased.

As shown in fig. 5, the standard aeration efficiency of a 50.8mm pump was tested. Three tests were again performed, each involving pumping water from the tank on a cyclical basis. In each test, the water in the tank was exposed to the atmosphere for a sufficient time to allow the oxygen concentration to equilibrate at 1 mg/L. In each test, a constant volumetric flow of gas was forced through the pump. In the first test, 75% of the flow was directed through the lower array and 25% of the flow was directed through the upper array. In the second test, the flow was split into 50: 50. In the third test, 25% of the flow was directed through the lower array and 75% through the upper array. Figure 5 shows that the highest amount of oxygen can be transferred to the water per kilowatt used in the fan for the 75% radial flow test. As the water reaches saturation, the amount of oxygen transferred to the water decreases over time.

Accordingly, the invention is to be construed as limited only by the appended claims and as interpreted in a targeted manner.

Claims

1. A pump for use with a supply of a working fluid and a supply of a fluid material having a higher density than the working fluid, the pump comprising:

a vertically extending conduit immersed in the supply of fluid material in use; the vertically extending conduit having a lower portion, an upper portion, and an intermediate portion between the lower portion and the upper portion, wherein the intermediate portion has a smaller cross-sectional area than the upper portion, the lower portion has a diameter D, and the intermediate portion has a diameter D;

a lifting device, comprising:

n2 ports, the N2 ports being arranged over the length of the lower portion; each port having a diameter E, each said port further comprising a tip at said lower portion and said port extending horizontally away from said tip such that working fluid is directed toward the center of said conduit; and

an ejector having a tip located at a top of the middle portion and extending vertically downward such that the working fluid is directed vertically upward; the tip of the injector is defined by a cylindrical recess of thickness B;

an annular cavity surrounding the eductor; said annular chamber having a length A and communicating with said eductor through a row of N1 orifices; the row of N1 holes is spaced a distance F from the junction of the transition portion and the intermediate portion, and each hole has a diameter C;

wherein if B, C, D, E and F are expressed in millimeters

D is between about 25.4mm and 203.2 mm;

B≈0.521(D)^0.296

C≈1.918(D)^0.343

E≈0.521(D)^0.296

F≈0.321D-3.41。

2. the pump of claim 1, wherein D, a, B, C, D, E, F, N1, and N2 are sized according to any one of the following geometries: