CN113530891A

CN113530891A - Jet pump

Info

Publication number: CN113530891A
Application number: CN202110402481.9A
Authority: CN
Inventors: D·昆塔利卡; S·苏布拉塔; M·艾伦
Original assignee: Eaton Intelligent Power Ltd
Current assignee: Eaton Intelligent Power Ltd
Priority date: 2020-04-14
Filing date: 2021-04-14
Publication date: 2021-10-22
Also published as: EP3896292A1; US20210317845A1

Abstract

An injection pump may include a body that may include an inlet portion having a motive port and a first induction port, a throat portion, a tapered wall connecting the inlet portion with the throat portion, a discharge port, and a diffuser connecting the throat portion and the discharge port. The tapered wall may include a convergence angle of about 5 degrees.

Description

Jet pump

Cross Reference to Related Applications

This application claims the benefit of indian provisional patent application serial No. 202011016130 filed on 14/4/2020, the disclosure of which is hereby incorporated by reference in its entirety.

Technical Field

The present disclosure relates generally to jet pumps, including jet pumps that may be used in conjunction with aircraft fuel delivery/scavenge pumps, oil/air pumps, water pumps, chemical injectors, thermal management systems, and/or nuclear reaction pumps, among others.

Background

This background description is set forth below merely to provide context. Thus, any aspect of this background description is not admitted to be prior art by any other means, nor is it admitted to be prior art by express or implicit prior art to the instant disclosure.

Some existing jet pump designs are inefficient and/or require a high power input.

It is desirable to have a solution/option that minimizes or eliminates one or more of the difficulties or disadvantages of jet pumps. The above discussion is intended to be merely illustrative of examples in the art and is not intended to be negative in scope.

Disclosure of Invention

In an embodiment, an ejector pump may include a body that may include an inlet portion having a motive port and a first induction port, a throat portion, a conical wall connecting the inlet portion with the throat portion, a discharge port, and a diffuser connecting the throat portion and the discharge port. The tapered wall may, for example, but not limited to, include a convergence angle of about 5 degrees.

The above and other possible aspects, features, details, utilities, and/or advantages of the examples/embodiments of the disclosure will become apparent from reading the following description and from viewing the accompanying drawings.

Drawings

While the claims are not limited to the specific illustrations, an understanding of various aspects may be obtained by discussing various examples. The drawings are not necessarily to scale and certain features may be exaggerated or hidden to better illustrate and explain an innovative aspect of an example. Furthermore, the illustrative descriptions set forth herein are not intended to be exhaustive or otherwise limiting and are not intended to be limited to the precise forms and configurations shown in the drawings or disclosed in the following detailed description. Exemplary illustrations are described in detail by reference to the following drawings:

fig. 1 is a cross-sectional view generally illustrating an embodiment of an ejector pump according to the teachings of the present disclosure.

Fig. 2 is a cross-sectional view generally illustrating portions of an embodiment of a jet pump and the fluid velocity therein according to the teachings of the present disclosure.

Fig. 3 is a cross-sectional and graphical view generally illustrating total fluid pressure in various locations of an embodiment of a jet pump according to the teachings of the present disclosure.

FIG. 4 is a graphical illustration of the efficiency of a flow ratio relative to an induced flow to a motive flow associated with an embodiment of an ejector pump according to the teachings of the present disclosure.

Fig. 5 is a cross-sectional view generally illustrating an embodiment of an ejector pump according to the teachings of the present disclosure.

FIG. 6 is a cross-sectional view generally illustrating portions of an embodiment of a jet pump and the fluid velocity in the jet pump according to the teachings of the present disclosure.

FIG. 7 is a graphical illustration of the efficiency of a flow ratio relative to an induced flow to a motive flow associated with an embodiment of an ejector pump according to the teachings of the present disclosure.

Detailed Description

Reference will now be made in detail to embodiments of the present disclosure, examples of which are described herein and illustrated in the accompanying drawings. While the present disclosure will be described in conjunction with the embodiments and/or examples, they do not limit the present disclosure to these embodiments and/or examples. On the contrary, the present disclosure encompasses alternatives, modifications, and equivalents.

In embodiments such as the embodiment generally shown in fig. 1, the jet pump 100 can include a body 102 that can include a generally cylindrical and/or elongated configuration. The body 102 may include an inlet portion 104, an outlet/discharge port 110, a throat 112, and/or a diffuser 114. The inlet portion 104 may include a first induction port 106, a motive port 108, and/or a first nozzle 118. The throat 112 may be connected to an output of the inlet portion 104 and/or an input of a diffuser 114. The diffuser 114 may be connected to an output of the throat 112 and/or an input of the discharge port 110. For example, without limitation, the body 102 may be configured for fluid flow from the inlet portion 104 to the throat 112, from the throat 112 to the diffuser 114, and/or from the diffuser 114 to the discharge port 110.

According to an embodiment, the motive flow 126 (e.g., fluid, pressurized fuel, etc.) may be provided to the motive port 108, such as from a fluid source 140 (e.g., fluid pump, tank, etc.). As the motive flow 126 moves through the motive port 108 and into the first nozzle 118, the motive flow 126 may accelerate and the pressure of the motive flow 126 may decrease (e.g., venturi effect). The reduction in pressure may create a vacuum or reduced pressure region in the body 102, which may draw additional fluid (e.g., the first induced flow 128) into the first induction port 106, such as from a canister or reservoir 142. In embodiments such as the embodiment generally shown in fig. 2, the first induced flow 128 may flow around the exterior of the first nozzle 118 toward the converging or tapered wall 120 of the body 102, wherein the first induced flow 128 may mix with the motive flow 126. The tapered wall 120 may, for example, at least partially define a mixing chamber for the motive flow 126 and the first induced flow 128. Tapered wall 120 may include a convergence angle 122. The convergence angle 122 may be configured to maximize the contact area between the motive flow 126 and the first induced flow 128, which may facilitate efficient mixing. As generally shown in fig. 3, in one example, the total pressure drop may be, for example, but not limited to, up to about 14.7% of the plane 6, which may be indicative of low expansion losses associated with embodiments of the jet pump 100. The convergence angle 122 may be, for example, without limitation, about 0 degrees to about 10 degrees, such as about 5 degrees and/or about 5.3 degrees.

According to an embodiment, the end/outlet of the first nozzle 118 may be at least partially aligned with the tapered wall 120 such that the motive flow 126 exiting the first nozzle 118 from the motive port 108 mixes with the first inducing flow 128 from the first inducing port 106 proximate the tapered wall 120.

In an embodiment, the efficiency of the jet pump 100 may correspond to the product of the flow ratio and the pressure ratio. The flow ratio may correspond to the induced flow divided by the motive flow. The pressure ratio may correspond to the difference between the total pressure discharged and the total induced pressure divided by the difference between the total power pressure and the total discharge pressure.

Embodiments of jet pump 100 can limit flow mixing losses, friction losses, and/or jet losses, which can provide embodiments of jet pump 100 with improved performance relative to other designs.

According to embodiments of jet pump 100, the distance between the end of first nozzle 118 and the beginning of throat 112 and the throat diameter may be configured to optimize efficiency. For example, but not limiting of, the distance may be about two to four times the diameter of the throat.

In an embodiment of jet pump 100, tapered wall 120 may be curved. The curvature of the tapered wall 120 may be relatively smooth such that the radius of curvature divided by the throat diameter may be about 60 to 80, such as about 73. Providing a relatively smooth curvature may limit sudden shrinkage losses and/or Coanda effects (Coanda effects).

According to embodiments of jet pump 100, the ratio of nozzle area to throat area may be configured to optimize efficiency. For example, but not limiting of, the ratio may be about 0.24 to about 0.25, such as about 0.246.

In embodiments, the throat 112 may be configured to optimize flow mixing, which may include the length of the throat 112 being longer than the diameter of the throat 112. For example, and without limitation, the length of the throat 112 may be at least about 7 times longer (e.g., 7.58 times longer) than the diameter of the throat 112. The diameter of the throat 112 may be substantially constant, and/or the throat 112 may be substantially straight.

According to an embodiment, a diffuser 114 may be connected to an end of the throat 112 and may be configured for static pressure recovery. The diffuser 114 may increase in diameter from the throat 112 toward the discharge port 110.

In embodiments such as the embodiment generally shown in fig. 5, the body 102 of the jet pump 100 can include a motive port 108, a first induction port 106, a second induction port 116, a first nozzle 118, and/or a second nozzle 124. The motive port 108, the first and/or

second induction ports

106, 116, the first nozzle 118, and/or the second nozzle 124 may be disposed substantially concentrically. The second inducer port 116 may include a larger outer diameter than the first inducer port 106, which may include a larger outer diameter than the power port 108. The first nozzle 118 may be connected to be in fluid communication with the power port 108. The second nozzle 124 may be connected to be in fluid communication with the first induction port 106. The first nozzle 118 may include a smaller minimum diameter than the power port 108. The second nozzle 124 may include a smaller minimum diameter than the first induction port 106. The minimum diameters of first nozzle 118 and second nozzle 124 may be, for example, but not limited to, substantially equal.

According to an embodiment, the first and second inducing

ports

106, 116 may be configured such that the first inducing flow 128 may move into the first inducing port 106 and the second inducing flow 130 may move into the second inducing port 116 when the fluid pressure in the body 102 is reduced (e.g., when the motive flow 126 is accelerated). The first induced flow 128 may move around the first nozzle 118 to mix with the motive flow 126. The second induced flow 130 may move about the second nozzle 124 to mix with the motive flow 126 and/or the first induced flow 128. According to an embodiment, the junction 134 between the inlet portion 104 and the throat 112 may be smooth and/or rounded in order to minimize losses.

In embodiments, the second nozzle 124 (and/or an end thereof) may be offset from the first nozzle in the axial direction. With this configuration, the first induced flow 128 may mix (e.g., step mixing) with the motive flow 126 upstream in the first mixing region 136 and/or before the second induced flow 130 mixes with the motive flow 126 in the second mixing region 138. Stepped mixing may facilitate efficient mixing and/or reduce mixing losses.

According to an embodiment, the ratio of the area of the first nozzle 118 to the area of the second nozzle 124 may be optimized to improve efficiency. For example, but not limiting of, the ratio may be about 0.35 to about 0.45, such as about 0.41. In an embodiment, the distance between first nozzle 118 and second nozzle 124 (e.g., in the axial direction) may be optimized. For example, but not limiting of, the ratio of the distance between the first nozzle 118 and the second nozzle 124 to the diameter of the first nozzle 118 may be about 2.0 to about 4.0, such as about 2.4 to 3.3.

In embodiments, the inner surface of the second nozzle 124 may serve as a mixing wall for the motive flow 126 and the first induced flow 128. The inner surface of the second nozzle 124 may be tapered and/or curved, and may, for example and without limitation, include a second convergence angle 132 of about 8 degrees to about 9 degrees (such as about 8.4 degrees), which may maximize efficiency in at least some instances. Tapered wall 120 may serve as a mixing wall for mixing of hybrid flow 126 and first and second induced flows 128 and 130. The convergence angle 122 may be, for example, but not limited to, about 18 degrees to about 19 degrees, such as about 18.5 degrees, which may maximize efficiency in at least some instances.

According to an embodiment, the distance between the second nozzle 124 and the throat 112 and/or the throat diameter may be optimized to improve efficiency. For example, but not limiting of, the ratio of the distance between the second nozzle 124 and the beginning of the throat 112 to the throat diameter may be about 1 to about 2, such as about 1.4.

In an embodiment, the area of the first nozzle 118 and/or the area of the throat 112 may be optimized to improve efficiency. For example, but not limiting of, the ratio of the area of the first nozzle 118 to the area of the throat 112 may be about 0.26 to about 0.27, such as about 0.263.

According to embodiments, the throat length and/or throat diameter may be optimized to improve efficiency. For example, but not limiting of, the ratio of throat length to throat diameter may be at least about 5, such as at least about 5.3.

According to embodiments, the jet pump 100 may provide an efficiency of about 34%, which may be about 12% -14% higher than other designs that may provide an efficiency of about 20% -20%. The efficiency of an embodiment of the jet pump 100 (e.g., having the single induction port configuration of fig. 1) can be maximized, for example and without limitation, when the ratio of the induced flow to the motive flow is from about 1 to about 1.4 (such as about 1.2) (see, e.g., fig. 4). Additionally or alternatively, the efficiency of an embodiment of the jet pump 100 (e.g., having the dual induction port configuration of fig. 5) can be maximized, for example, but not limited to, when the ratio of the induced flow to the motive flow is from about 0.9 to about 1.1 (such as, e.g., about 0.95) (see, e.g., fig. 7). Embodiments of the jet pump 100 can be configured for use with a variety of fluids, including liquids and gases. In contrast, the ejector may be configured for gas/air only.

In an embodiment, the jet pump 100 can be manufactured, for example, but not limited to, via additive manufacturing (e.g., 3D printing).

Various examples/embodiments of various devices, systems, and/or methods are described herein. Numerous specific details are set forth in order to provide a thorough understanding of the general structure, function, manufacture, and use of the examples/embodiments described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the examples/embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have not been described in detail so as not to obscure the examples/embodiments described in this specification. It will be appreciated by those of ordinary skill in the art that the examples/embodiments described and illustrated herein are non-limiting examples, and thus it is to be understood that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.

Reference throughout the specification to "an example," "in an example," "according to an example," "various embodiments," "according to an embodiment," "in an embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the example/embodiment is included in at least one embodiment. Thus, the appearances of the phrases "example," "in an example," "according to an example," "in various embodiments," "according to an embodiment," "in an embodiment," or "an embodiment," or the like, appearing in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more examples/embodiments. Thus, a particular feature, structure, or characteristic shown or described in connection with one embodiment/example may be combined, in whole or in part, with features, structures, functions, and/or characteristics of one or more other embodiments/examples, but without limitation, provided such combination is not logically or non-functionally undesirable. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the scope thereof.

It should be understood that reference to a single element is not limiting, and may include one or more such elements. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above, below, vertical, horizontal, clockwise, and counterclockwise) are only used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the examples/embodiments.

Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include joinder of elements and intermediate members between elements for relative movement therebetween. Thus, joinder references do not imply that two elements are directly connected/coupled and secured to each other. The use of "for example" in this specification is to be understood broadly and to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. The use of "and" or "should be understood to be broad (e.g., as" and/or "). For example, and without limitation, the use of "and" does not necessarily require that all elements or features be listed, and the use of "or" includes endpoints unless such configuration is not logically inconsistent.

While the processes, systems, and methods may be described herein in connection with a particular order of one or more steps, it should be understood that such methods may be performed in a different order of steps, some steps may be performed concurrently, some steps may be added, and/or some of the described steps may be omitted.

It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.

Claims

1. An ejector pump, comprising:

a body, the body comprising:

an inlet portion comprising a motive port and a first inducement port;

a throat;

a tapered wall connecting the inlet portion with the throat;

a discharge port; and

a diffuser connecting the throat and the discharge port.

2. The jet pump of claim 1, wherein the tapered wall comprises a convergence angle of about 5 degrees.

3. The jet pump of claim 1, wherein the inlet portion comprises a first nozzle.

4. The jet pump of claim 3, wherein an outlet or end of the first nozzle is at least partially aligned with the tapered wall such that a motive flow exiting the first nozzle from the motive port is mixed with an induced flow from the first induction port proximate the tapered wall.

5. The jet pump of claim 4, wherein the motive port and the first inducer port are disposed substantially concentrically, and the first inducer port includes a larger outer diameter than the motive port.

6. The jet pump of claim 1, wherein the inlet portion comprises a first nozzle, a second induction port, and a second nozzle.

7. The jet pump of claim 6, wherein the motive port, the first induction port, and the second induction port are disposed substantially concentrically.

8. The jet pump of claim 7, wherein the second inducer port includes a larger outer diameter than the motive port and the first inducer port.

9. The jet pump of claim 8, wherein the first nozzle is offset from the second nozzle in an axial direction.

10. The jet pump of claim 6, wherein the conical wall comprises a convergence angle and the second nozzle comprises a second convergence angle.