Structure for improving hump of centrifugal pump

Abstract

The utility model relates to a structure for improving the hump of a centrifugal pump, which comprises a suction section and an impeller, a partition plate is fixed on the suction section, and a certain distance is reserved between the partition plate and an inlet of the impeller; the height of the partition plate is the position from the suction section to the center line of the impeller in the horizontal direction. The partition plate and the suction section are fixed together in a welding mode. The structure for improving the hump of the centrifugal pump is simple and easy to produce, geometric parameters of the impeller do not need to be changed, indexes of lift and efficiency cannot be greatly influenced while a stable performance curve is obtained, and stable and safe operation of the pump and a unit is guaranteed.

Description

Technical Field

[0001] The utility model relates to a pump body structure, in particular to a structure for improving the hump of a centrifugal pump which has a simple structure and is easy to produce, does not require changing geometric parameters of an impeller, and does not have a significant impact on indicators of head and efficiency while obtaining a stable performance curve. Background Art

[0002] In most cases in engineering, the relationship curve between flow and head should be a hump-free curve, that is, the flow-head curve cannot have a positive slope, so as to avoid the vibration and noise of the pump caused by the hump, thereby affecting the stable operation of the pump and the piping system. The existing method of reducing the hump is mainly to change the impeller geometric parameters, such as beveling the impeller outlet edge or reducing the impeller outlet angle β2 or outlet width b2.

[0003] The existing method to improve the impeller hump is mainly to ensure the stability of the performance curve by changing the geometric parameters of the impeller. It is well known that the parameters of the hydraulic model of the centrifugal pump are mutually restricted, so changing one item will not have much effect on completely eliminating the hump. If multiple geometric parameters are changed, the performance indicators of the centrifugal pump such as head, efficiency and cavitation will often fail to meet the user's requirements, thus affecting the stable and safe operation of the unit. Utility Model Content

[0004] In view of the above problems, the main purpose of the utility model is to provide a structure for improving the hump of a centrifugal pump which is simple in structure and easy to produce, does not require changing the geometric parameters of the impeller, and does not have a significant impact on the head and efficiency indicators while obtaining a stable performance curve.

[0005] The utility model solves the above technical problems through the following scheme: a structure of improving the hump of a centrifugal pump, the structure of improving the hump of a centrifugal pump comprises: a suction section, an impeller, a partition is fixed on the suction section, the partition is a certain distance away from the impeller inlet; the height of the partition is the position of the center line from the suction section to the impeller in the horizontal direction.

[0006] In a specific implementation example of the utility model, the partition is fixed to the suction section by welding.

[0007] In a specific implementation example of the present utility model, the thickness range of the partition is: 3-8mm.

[0008] In a specific implementation example of the present utility model, the distance between the partition plate and the impeller inlet ranges from 15 to 40 mm.

[0009] In a specific implementation example of the utility model, the distance between the partition and the impeller inlet is 20 mm.

[0010] In a specific implementation example of the present utility model, the partition is a partition with rounded corners.

[0011] In a specific implementation example of the present utility model, the width of the structural partition in the horizontal direction is 2-5 times the distance between the partition and the impeller inlet.

[0012] The positive progressive effect of the utility model is that compared with the common similar technologies, the structure of the improved centrifugal pump hump provided by the utility model is simple and easy to produce, and there is no need to change the geometric parameters of the impeller. While obtaining a stable performance curve, it will not have a significant impact on the head and efficiency indicators, thereby ensuring the stable and safe operation of the pump and the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 It is a comparison diagram of the performance curves of the three schemes in the utility model.

[0015] The following are the names corresponding to the label numbers in this utility model:

[0016] Suction section 1, partition 2, impeller 3. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solution of the present invention in detail.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model. Figure 2 This is a comparison chart of the performance curves of the three schemes in the utility model, such as Figure 1-2 As shown: the utility model provides an improved structure of the centrifugal pump hump, which includes: a suction section 1, an impeller 3, a partition 2 fixed on the suction section 1, and the partition 2 is a certain distance away from the inlet of the impeller 3; the height of the partition 2 is the position of the center line from the suction section 1 to the impeller 3 in the horizontal direction.

[0019] The partition plate 2 in the utility model is fixed with the suction section 1 by welding. The partition plate 2 is a partition plate with rounded corners.

[0020] In the specific implementation process, the thickness range of the structural partition 2 in the utility model is: 3-8mm.

[0021] The distance between the partition plate 2 and the inlet of the impeller 3 ranges from 15 to 40 mm, preferably 20 mm. The width of the structural partition plate 2 in the horizontal direction is 2 to 5 times the distance between the partition plate 2 and the inlet of the impeller 2. Other values ​​or ranges can be selected for the above parameters according to specific circumstances.

[0022] according to Figure 2 As shown in the figure, a comparative test was conducted by combining the prototype and the three measures of beveling the impeller outlet. Figure 2 As shown: According to theoretical analysis, the beveled impeller should have a significant improvement on the hump, but the performance curve obtained from actual testing is almost the same as that of the prototype, and after adding a baffle in the suction section, the hump is almost completely eliminated.

[0023] In the initial design stage, if the hump is eliminated by changing the impeller geometry, it is necessary to continuously predict the hydraulic performance curve and adjust the geometry. At the same time, the coordination between the dimensions must be ensured, which greatly increases the product cost and may affect the final delivery date of the product. If the hump phenomenon is found in the field test stage, it is limited to adjust the performance curve by changing the impeller geometry. If a new model is redesigned, the product cost will also be greatly increased. Regardless of the initial design stage or the factory test stage, a partition can be welded at the inlet of the suction section to avoid the generation of the hump. This method is not only simple in structure, but also can obtain a stable performance curve to ensure the stable operation of the pump and the unit.

[0024] The utility model has a simple structure and is easy to produce. It does not need to change the geometric parameters of the impeller. While obtaining a stable performance curve, it will not have a significant impact on the indicators of head and efficiency, thus ensuring the stable and safe operation of the pump and the unit.

[0025] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A structure for improving the hump of a centrifugal pump, characterized in that: The structure of the improved centrifugal pump hump comprises: a suction section (1) and an impeller (3); a partition plate (2) is fixed on the suction section (1), and the partition plate (2) is a certain distance away from the inlet of the impeller (3); the height of the partition plate (2) is the position of the center line from the suction section (1) to the impeller (3) in the horizontal direction; The distance range of a certain distance is: 15-40mm.

2. The structure for improving the centrifugal pump hump according to claim 1, characterized in that: The partition plate (2) is fixed to the suction section (1) by welding.

3. The structure for improving the centrifugal pump hump according to claim 1, characterized in that: The thickness of the partition (2) ranges from 3 to 8 mm.

4. The structure for improving the hump of a centrifugal pump according to claim 1, characterized in that: The distance between the partition plate (2) and the inlet of the impeller (3) is 20 mm.

5. The structure for improving the centrifugal pump hump according to claim 1, characterized in that: The partition (2) is a partition with rounded corners.

6. The structure for improving the centrifugal pump hump according to claim 1, characterized in that: The width of the structural partition (2) in the horizontal direction is 2-5 times the distance between the partition (2) and the inlet of the impeller (3).

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