Pump structure for reducing hydraulic excitation under bias working condition

Abstract

The utility model discloses a pump structure for reducing hydraulic excitation under a bias working condition, and relates to the technical field of centrifugal pumps, in particular to the pump structure for reducing hydraulic excitation under the bias working condition in the industries such as oil refining and petrochemical engineering. According to the utility model, the impeller is arranged inside the pump body; the inlet end of the impeller blade adopts the three-section edge design, uniform pressure distribution is better facilitated, the sensitivity of the three-section inlet edge to the inlet attack angle is lower through CFD analysis, and therefore the design of the three-section inlet edge is more suitable for being used in the state of deviated working conditions. The three-section type edge design comprises a blade straight edge, a blade bevel edge and a blade round end; the two side edges, close to the blade inlet end, of the blade straight edge are designed to be blade bevel edges inclining inwards. The front end of the blade bevel edge is designed to be a blade round end. And the outlet throat part of the pump body is provided with a detachable baffle tongue movable block. According to the technical scheme, the problems that in the prior art, when a centrifugal pump is in a small-flow working condition, hydraulic excitation is too large, a bearing box is heated, and efficiency is low are solved.

Description

Pump structure to reduce hydraulic vibration under eccentric operating conditions Technical Field

[0001] This utility model relates to a pump structure for reducing hydraulic vibration under eccentric operating conditions, and is particularly relevant to pump structures for reducing hydraulic vibration under eccentric operating conditions in industries such as oil refining and petrochemicals. Background Technology

[0002] Due to differences in pump manufacturer selection and actual flow parameters at the user's site, centrifugal pumps often operate under suboptimal conditions at the user's site, failing to reach the rated flow rate specified during selection. Under these suboptimal flow conditions, the pump exhibits abnormal problems such as excessive hydraulic vibration, bearing housing overheating, and low efficiency. Without changing the suboptimal operating conditions, the pump vibration problem is difficult to resolve.

[0003] In view of the problems existing in the above-mentioned existing technologies, it is necessary to study and design a new pump structure to reduce hydraulic vibration under eccentric conditions, thereby overcoming the problems existing in the existing technologies. Summary of the Invention

[0004] To address the technical problems of excessive hydraulic vibration, bearing housing overheating, and low efficiency in centrifugal pumps operating under low flow conditions, this invention provides a pump structure to reduce hydraulic vibration under these conditions. This invention, starting from the pump's hydraulic structure design, modifies the pump's high-efficiency point and allows the impeller to operate over a wider flow range, thereby reducing hydraulic vibration, lowering pump vibration and noise, improving pump efficiency, and preventing abnormal pump operation in the field. The optimized solution is convenient, quick, low-cost, and reliable in use.

[0005] The technical means adopted in this utility model are as follows:

[0006] A pump structure for reducing hydraulic vibration under eccentric operating conditions includes: an impeller and a pump body; the impeller is installed inside the pump body.

[0007] Furthermore, the impeller blades adopt a three-segment edge design at the inlet end, which is more conducive to uniform pressure distribution. CFD analysis shows that the three-segment inlet edge is less sensitive to the inlet angle of attack. Therefore, the three-segment inlet edge design is more suitable for use under extreme operating conditions.

[0008] Furthermore, the three-segment edge design includes: a straight edge of the blade, a beveled edge of the blade, and a rounded end of the blade;

[0009] Furthermore, the straight edges of the blades are designed as inwardly inclined blade bevels on both sides near the blade inlet end.

[0010] Furthermore, the leading edge of the blade's bevel is designed to resemble a rounded blade end.

[0011] Furthermore, the outlet throat of the pump body is equipped with a detachable tongue-and-groove block.

[0012] Furthermore, the detachable tongue-blocking block is detachably mounted to the outlet throat of the pump body via screws.

[0013] Furthermore, the detachable tongue-and-groove block can be replaced with the pump body cut-off block;

[0014] Furthermore, when it is necessary to quickly resolve the hydraulic vibration problem under low flow conditions on-site, the throat tongue of the pump body needs to be removed, a pump body partition block needs to be installed, and the flow area of ​​the pump body throat needs to be adjusted to ultimately solve the vibration problem caused by low flow operation.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The pump structure for reducing hydraulic vibration under unbalanced operating conditions provided by this utility model changes the optimal working area of ​​the pump through a three-section blade inlet and a detachable pump body tongue block design, thereby reducing the hydraulic vibration of the pump, reducing pump vibration and noise, improving pump efficiency, avoiding abnormal operation of the pump on site, and the optimized solution is convenient, quick, low-cost, and reliable in use.

[0017] 2. The pump structure for reducing hydraulic vibration under unbalanced operating conditions provided by this utility model, through the design of a three-section impeller inlet side and a detachable pump body tongue structure, can adjust the flow range of the preferred working area to about 40% of the original high efficiency point according to the user's required flow rate.

[0018] In summary, the technical solution of this utility model solves the problems of excessive hydraulic vibration, bearing housing overheating, and low efficiency in the prior art when centrifugal pumps operate under low flow conditions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is a schematic diagram of the structure of this utility model;

[0021] Figure 2 shows the blade inlet end of this utility model;

[0022] Figure 3 is a schematic diagram of the original body structure.

[0023] In the diagram: 1. Impeller; 11. Straight edge of blade; 12. Beveled edge of blade; 13. Round end of blade; 2. Pump body; 3. Removable tongue-and-groove block; 4. Screw. Detailed Implementation

[0024] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0028] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0031] As shown in the figure, this utility model provides a pump structure to reduce hydraulic vibration under unbalanced operating conditions, including: impeller 1 and pump body 2; impeller 1 is installed inside pump body 2; the inlet end of the impeller 1 blade adopts a three-segment edge design, which is more conducive to uniform pressure distribution. Through CFD analysis, the three-segment inlet edge is less sensitive to the inlet angle of attack. Therefore, the three-segment inlet edge design is more suitable for use under unbalanced operating conditions.

[0032] The three-segment edge design includes: a straight edge 11, a beveled edge 12, and a rounded end 13; the straight edge 11 is designed with inwardly inclined beveled edges 12 on both sides near the inlet end of the blade 1; the front end of the beveled edge 12 is designed as a rounded end 13.

[0033] The outlet throat of the pump body 2 is equipped with a detachable tongue-blocking block 3.

[0034] The removable tongue-separating block 3 is detachably mounted on the outlet throat of the pump body 2 via screws 4.

[0035] The detachable tongue-separating block 3 can be replaced with the pump body cut-off block.

[0036] When it is necessary to quickly resolve the hydraulic vibration problem under low flow conditions on site, the throat tongue of the pump body needs to be removed, a pump body partition block needs to be installed, and the flow area of ​​the pump body throat needs to be adjusted to ultimately solve the vibration problem caused by low flow operation.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pump structure for reducing hydraulic vibration under eccentric operating conditions, comprising: Impeller (1), pump body (2); the impeller (1) is installed inside the pump body (2); characterized in that: the inlet end of the blade of the impeller (1) adopts a three-segment edge design; the three-segment edge design includes: straight edge (11) of the blade, oblique edge (12) of the blade and round end (13) of the blade; the straight edge (11) of the blade is designed as an inwardly inclined oblique edge (12) on both sides near the inlet end of the impeller (1); the front end of the oblique edge (12) of the blade is designed as a round end (13).

2. The pump structure for reducing hydraulic vibration under eccentric operating conditions according to claim 1, characterized in that: The outlet throat of the pump body (2) is equipped with a detachable tongue-blocking block (3).

3. The pump structure for reducing hydraulic vibration under eccentric conditions according to claim 2, characterized in that: The removable tongue-blocking block (3) is detachably mounted on the outlet throat of the pump body (2) by means of screws (4).

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