Water guiding and vortex eliminating structure suitable for small and medium-sized water pumps

Abstract

The utility model provides a water-guiding vortex-eliminating structure suitable for small and medium-sized water pumps, which comprises a water inlet pool, a water outlet pool, a water inlet pipe, a water outlet pipe and a water outlet pipe, the bottom of the diversion cone is connected with the bottom plate; a pipe opening of the water absorption horn pipe is flush with the top of the flow guide cone; a water inlet of the vertical pump is connected with one end of the water absorption horn pipe; the center line of the flow guide cone and the center line of the water suction horn pipe coincide with the center line of an impeller of the vertical pump. According to the utility model, the flow guide cone flush with the pipe orifice of the water absorption horn pipe is arranged below the water absorption horn pipe, so that the void backflow below the water absorption horn pipe is reduced; and the omega-shaped rear wall is arranged behind the water suction horn pipe, a certain maintenance and installation operation space is created, and a good water inlet flow state is provided for an inlet of the water pump through rectification of the omega-shaped rear wall. Operation stability of the water pump can be effectively improved, operation cavitation performance of the water pump is improved, and operation noise of the water pump is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy projects, and more specifically relates to a water guiding and vortex eliminating structure suitable for small and medium-sized water pumps. Background Art

[0002] Considering the convenience and economy of underwater hydraulic structure construction, small and medium-sized pump stations mostly use a limited width inlet pool with a suction bell pipe for water pump installation. Small pump stations use an open wet rectangular inlet pool, and medium-sized pump stations mostly use a dry pump room structure with a pressurized rectangular inlet pool. When the inlet pool is not designed properly, vortex belts are easily generated, and the water in the center of the vortex is vaporized. One end of the vortex belt is located on the pool wall (or pool bottom), and the other end enters the suction bell mouth, generating periodic vibration and noise, affecting the performance and life of the water pump. Figure 2 The longitudinal section diagram of the vortex attached to the wall and the vortex attached to the bottom of the water inlet pool in the prior art is shown. In the installation of small and medium-sized water pumps, the water pump manufacturing unit is mostly relied on to weaken the influence of the water inlet flow state through the performance and stability of the water pump, rather than eliminating and improving it.

[0003] In the prior art, the rectangular structure of the water inlet pool is the most common form in the pump station. This form is often prone to vortexes at the corners and the back wall of the water pump. It is also easily affected by the flow pattern of the front pool, causing backflow in the pool. In order to improve the flow pattern, the water inlet pipe should be close to the back wall, but for vertical pumps, the pipe mouth is close to the back wall, which will cause difficulties in maintenance and installation. Article 10.3.3 of the current "Pump Station Design Standard" (GB 50265-2022) also only stipulates the requirements for the distance between the water inlet bell mouth and the building.

[0004] To this end, whether there is pressure or no pressure, good water inlet conditions must be provided for the water pump inlet to avoid turbulent flow on the back wall of the inlet pool, obvious deviation and vortex on one side. Therefore, it is necessary to design a water guide and vortex elimination structure suitable for small and medium-sized water pumps to ensure a better water inlet flow state and ensure safe and stable operation of the unit. Utility Model Content

[0005] The utility model aims to provide a water guiding and vortex eliminating structure suitable for small and medium-sized water pumps, so as to solve the technical problems of complex turbulence in the water inlet pool and the easy occurrence of wall-attached vortices and bottom-attached vortices, so as to ensure the safe and stable operation of the unit.

[0006] To achieve the above purpose, the utility model provides a water guiding and vortex eliminating structure suitable for small and medium-sized water pumps, comprising:

[0007] A water inlet pool, comprising a bottom plate, side walls and an ω-shaped rear wall;

[0008] A guide cone, the bottom of which is connected to the bottom plate;

[0009] A water suction trumpet pipe, the mouth of which is flush with the top of the guide cone; and

[0010] A vertical pump, the water inlet of which is connected to one end of the water suction bell pipe;

[0011] The center line of the guide cone, the center line of the water suction bell pipe and the center line of the impeller of the vertical pump coincide with each other.

[0012] Furthermore, the profile of the ω-shaped rear wall includes a first arc segment, a second arc segment, a straight line segment, a third arc segment and a fourth arc segment connected in sequence, and the profile of the ω-shaped rear wall is mirror-symmetrical about the perpendicular bisector of the straight line segment.

[0013] Furthermore, the bottom circle diameter of the guide cone is the same as the mouth circle diameter of the water suction bell pipe.

[0014] Furthermore, the top circle diameter D2 of the guide cone is the same as the hub diameter D1 of the vertical pump.

[0015] Furthermore, the impeller diameter of the vertical pump is D, the bottom circle diameter of the guide cone is D3=1.5D, and the distance between the side walls is B=2.5D3.

[0016] Furthermore, the curved generatrix of the guide cone is a 1 / 4 elliptical arc, the semi-major axis dimension a=1.67D, and the semi-minor axis dimension b=0.5(D3-D2).

[0017] Furthermore, the arc radius R1 of the first arc segment is 0.5B.

[0018] Furthermore, the center coordinates of the first arc segment are (0, 0), the center line of the guide cone is at a distance of L2 from the farthest end of the ω-shaped rear wall, and the center coordinates of the second arc segment are (x, y), x=(4×B×L2-B2-D3 2 ) / (4×(B-D3)), y=((L2-x)2-(0.5D3-x)2) 0.5 The radius of the second arc segment R2 = (B2 + D3 2 -4×D3×L2) / (4×(B-D3)).

[0019] Furthermore, the distance between the center line of the guide cone and the straight line segment is L1=0.5D3+0.1m.

[0020] Furthermore, the distance between the center line of the guide cone and the farthest end of the ω-shaped rear wall is L2=0.9D3.

[0021] Compared with the prior art, the utility model has the following technical effects:

[0022] The utility model is a water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps. By setting a guide cone flush with the pipe mouth below the water suction bell pipe, the evacuation backflow below the water suction bell pipe is reduced; and by setting an ω-shaped rear wall behind the water suction bell pipe, a certain maintenance and installation operation space is created. The ω-shaped rear wall is rectified to avoid the turbulence of the flow state on the rear wall of the water inlet pool, improve the uniformity of the suction flow velocity distribution of the water suction bell pipe, reduce the influence of the flow state of the front pool, avoid obvious deviation and vortex on one side, and provide a good water inlet flow state for the water pump inlet. The utility model is a water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps. It can effectively improve the running stability of the water pump, improve the cavitation performance of the water pump, and reduce the running noise of the water pump. The utility model is applied to the transformation of small and medium-sized pumping stations to solve the problem of improving the vortex belt in the open water inlet pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic diagram of the overall structure of a water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps provided in an embodiment of the utility model;

[0025] Figure 2 It is a longitudinal section schematic diagram of a wall-attached vortex and a bottom-attached vortex for water absorption in a water inlet pool in the prior art;

[0026] Figure 3 for Figure 1 A schematic cross-sectional structure diagram of ;

[0027] Figure 4 for Figure 1 A schematic diagram of a top view structure;

[0028] Figure 5 for Figure 4 Schematic diagram of the dimensional parameters of each part of the middle ω-shaped rear wall profile.

[0029] Among them, the reference numerals in the figure are:

[0030] 1. Vertical pump, 2. Suction bell pipe, 3. Guide cone, 4. Bottom plate, 5. Side wall, 6. ω-shaped rear wall, 7. Hub, 8. Orifice circle of suction bell pipe, 9. Top circle of guide cone, 10. Bottom circle of guide cone, 11. Generatrix of guide cone curved surface, 12. First arc segment, 13. Second arc segment, 14. Straight segment. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be understood that the terms "length", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0034] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present invention, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0035] See also Figure 1 , Figure 3-5 Now, a water guiding and vortex eliminating structure suitable for small and medium-sized water pumps provided in an embodiment of the utility model is described.

[0036] In one embodiment of the utility model, a water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps of the utility model embodiment comprises a water inlet pool, a guide cone 3, a water suction bell pipe 2 and a vertical pump 1. The water inlet pool comprises a bottom plate 4, a side wall 5 and an ω-shaped rear wall 6, and the ω-shaped rear wall 6 is connected to the bottom plate 4 and the side wall 5; the guide cone 3 is arranged on the bottom plate 4 of the water inlet pool, and its bottom is connected to the bottom plate 4 of the water inlet pool, and its top elevation is flush with the elevation of the mouth of the water suction bell pipe 2, that is, the mouth of the water suction bell pipe 2 is flush with the top of the guide cone 3. The water inlet of the vertical pump 1 is connected to one end of the water suction bell pipe 2, that is, the vertical pump 1 absorbs water by connecting the water suction bell pipe 2, and the guide cone 3 is located directly below the center position of the water suction bell pipe 2. The center line of the guide cone 3 and the center line of the water suction bell pipe 2 coincide with the center line of the impeller of the vertical pump 1.

[0037] A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps in an embodiment of the utility model reduces the emptying and backflow below the water suction bell tube 2 by setting a guide cone 3 flush with its pipe mouth below the water suction bell tube 2; and creates a certain maintenance and installation operation space by setting an ω-shaped rear wall 6 behind the water suction bell tube 2. The ω-shaped rear wall 6 is used for rectification to avoid the turbulence of the flow state at the rear wall of the water inlet pool, improve the uniformity of the suction flow velocity distribution of the water suction bell tube 2, reduce the influence of the flow state of the front pool, avoid obvious deviation and vortex on one side, and provide a good water inlet flow state for the water pump inlet. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps in an embodiment of the utility model can effectively improve the running stability of the water pump, improve the cavitation performance of the water pump, and reduce the running noise of the water pump. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps in an embodiment of the utility model is applied to the transformation of small and medium-sized pumping stations to solve the problem of improving the vortex belt in the open water inlet pool.

[0038] The profile of the ω-shaped rear wall 6 of the embodiment of the utility model includes a first arc segment 12, a second arc segment 13, a straight line segment 14, a third arc segment and a fourth arc segment connected in sequence, and the profile of the ω-shaped rear wall 6 is mirror-symmetrical about the perpendicular bisector of the straight line segment 14, that is, the shape of the third arc segment is consistent with that of the second arc segment 13, and the shape of the fourth arc segment is consistent with that of the first arc segment 12. That is, the profile of the ω-shaped rear wall 6 has two saddle-shaped curved surfaces, connected by four arc segments and one straight line, and is mirror-symmetrical along the center line of the water inlet pool in the direction of water flow.

[0039] In this embodiment, the guide cone curved surface generatrix 11 is a 1 / 4 elliptical arc, the semi-major axis size is a, and the semi-minor axis size is b. The distance between the center line of the unit (i.e., the center line of the guide cone 3) and the straight line segment 14 of the ω-shaped rear wall 6 is L1, and the distance between the center line of the unit and the farthest end of the ω-shaped rear wall 6 is L2. The center coordinates of the first arc segment 12 of the ω-shaped rear wall 6 are (0, 0), and the radius is R1, and the center coordinates of the second arc segment 13 of the ω-shaped rear wall 6 are (x, y), and the radius is R2.

[0040] The impeller diameter of the vertical pump 1 is φD, the circular diameter of the hub 7 of the vertical pump 1 is φD1, the diameter of the top circle 9 of the guide cone is φD2, and the diameter of the bottom circle 10 of the guide cone is φD3. The diameter of the bottom circle 10 of the guide cone is the same as the diameter of the pipe mouth circle 8 of the water suction bell pipe, and φD3 = 1.5D, and the distance B between the two side walls 5 of the water inlet pool is 2.5D3.

[0041] In this embodiment, the diameter of the hub 7 of the vertical pump 1 is equal to the diameter of the top circle 9 of the guide cone, that is, φD1=φD2. The semi-major axis size a=1.67D, the semi-minor axis size b=0.5(D3-D2). The radius R1 of the first arc segment 12 of the ω-shaped rear wall 6=0.5B; the radius R2 of the second arc segment 13 of the ω-shaped rear wall 6=(B2+D32 -4×D3×L2) / (4×(B-D3)), and x=(4×B×L2-B2-D3 2 ) / (4×(B-D3)), y=((L2-x)2-(0.5D3-x)2) 0.5 .

[0042] In this embodiment, the distance between the center line of the unit and the straight section 14 of the ω-shaped rear wall 6 is L1=0.5D3+0.1m, and the distance between the center line of the unit and the farthest end of the ω-shaped rear wall 6 is L2=0.9D3.

[0043] This embodiment can reasonably determine the geometric dimensions of the water inlet pool during the engineering design stage, which is convenient for construction while ensuring a better water inlet flow state, and can effectively improve the running stability of the water pump, improve the cavitation performance of the water pump, and reduce the running noise of the water pump.

[0044] All unexplained parts involved in the present invention belong to the prior art.

[0045] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps, characterized in that: include: A water inlet pool, comprising a bottom plate, a side wall and an ω-shaped rear wall; the profile of the ω-shaped rear wall comprises a first arc segment, a second arc segment, a straight line segment, a third arc segment and a fourth arc segment connected in sequence, and the profile of the ω-shaped rear wall is mirror-symmetrical about the perpendicular midline of the straight line segment; A guide cone, the bottom of which is connected to the bottom plate; the diameter of the bottom circle of the guide cone is D3, and the distance between the center line of the guide cone and the straight line segment is L1=0.5D3+0.1m; A water suction trumpet pipe, the mouth of which is flush with the top of the guide cone; and A vertical pump, the water inlet of which is connected to one end of the water suction bell pipe; The center line of the guide cone, the center line of the water suction bell pipe and the center line of the impeller of the vertical pump coincide with each other.

2. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps as claimed in claim 1, characterized in that: The bottom circle diameter of the guide cone is the same as the pipe mouth circle diameter of the water suction bell pipe.

3. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps as claimed in claim 2, characterized in that: The top circle diameter D2 of the guide cone is the same as the hub diameter D1 of the vertical pump.

4. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps as claimed in claim 3, characterized in that: The impeller diameter of the vertical pump is D, the bottom circle diameter of the guide cone is D3=1.5D, and the distance between the side walls is B=2.5D3.

5. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps as claimed in claim 4, characterized in that: The curved generatrix of the guide cone is a 1 / 4 elliptical arc, the semi-major axis dimension a=1.67D, and the semi-minor axis dimension b=0.5(D3-D2).

6. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps as claimed in claim 4, characterized in that: The arc radius R1 of the first arc segment is 0.5B.

7. A water-guiding and vortex-eliminating structure suitable for small and medium-sized water pumps as claimed in claim 4, characterized in that: The center coordinates of the first arc segment are (0, 0), the center line of the guide cone is at a distance of L2 from the farthest end of the ω-shaped rear wall, and the center coordinates of the second arc segment are (x, y), where x=(4×B×L2-B2-D3 2 ) / (4×(B-D3)), y=((L2-x)2-(0.5D3-x)2) 0.5 The radius of the second arc segment R2 = (B2 + D3 2 -4×D3×L2) / (4×(B-D3)).

8. A water guiding and vortex eliminating structure suitable for small and medium-sized water pumps as claimed in any one of claims 4 to 7, characterized in that: The distance between the center line of the guide cone and the farthest end of the ω-shaped rear wall is L2=0.9D3.

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