Double-suction pump inlet structure with guide vanes and double-suction pump

Abstract

The present application provides a double-suction pump inlet structure with guide vanes and a double-suction pump, which belongs to the technical field of double-suction pumps, and includes a spiral water absorption chamber used as the inlet of the double-suction pump, and a curved guide vane is fixed and horizontally arranged in the spiral water absorption chamber. After water enters the spiral water absorption chamber, it flows through the upper and lower sides of the guide vane. The end of the guide vane facing the inlet end of the spiral water absorption chamber is semi-elliptical arc-shaped, which helps to reduce turbulence and energy loss when the fluid enters. The end of the guide vane facing the outlet end of the spiral water absorption chamber has an upper convex arc surface and a lower convex arc surface and forms an acute angle, which is conducive to the smooth transition of the fluid and reduces the flow resistance. The bending direction of the guide vane is consistent with the bending direction of the spiral water absorption chamber, which can enhance the guiding property of the fluid and further improve the suction efficiency and overall performance of the pump. The addition of the guide vane enables the double-suction pump to achieve higher flow efficiency and lower energy consumption during operation, thereby improving the overall performance of the pump.

Description

Technical Field

[0001] The present application belongs to the technical field of double-suction pumps, and more specifically, relates to a double-suction pump inlet structure with guide vanes and a double-suction pump. Background Art

[0002] As a common fluid conveying equipment, double-suction centrifugal pumps are widely used in places with limited installation space because of their large flow rate, high head, inlet and outlet on the same straight line, small size, and easy installation. However, since the internal flow of the pump is often very complex and unstable, the existence of a bad flow state in the pump will cause a large amount of energy dissipation, which also directly affects the overall energy consumption and operating costs of the system. Therefore, improving the flow state in the pump and improving the efficiency of the pump are of great significance for energy conservation and emission reduction. Because the flow channel of the spiral suction chamber of the double-suction pump is relatively twisted, it will induce complex flow phenomena such as inlet reflux and flow separation vortex under the design conditions, thereby reducing the work capacity of the impeller and generating a large amount of energy dissipation, which has a negative impact on the overall performance of the pump.

[0003] At present, one of the structural methods for improving the flow of double-suction pumps in the industry is to optimize the flow state of the liquid through guide vanes. For example, a multi-stage double-suction pump with additional guide vanes is disclosed in the publication number CN201771780U, in which guide vanes are set between the last-stage extrusion chamber and the impeller in the pump cavity of the multi-stage double-suction pump. However, in actual situations, the flow state of the liquid in the spiral water absorption chamber at the inlet of the double-suction pump is more complicated. If the flow state of the fluid can be optimized at the inlet, the overall efficiency of the pump will be greatly improved. Summary of the invention

[0004] The present invention provides a double-suction pump inlet structure with guide vanes and a double-suction pump. Guide vanes are arranged in a spiral water suction chamber to ensure smoother flow of fluid and effectively improve the efficiency of the double-suction pump.

[0005] To achieve the above-mentioned purpose, the technical solution of the present application provides a double-suction pump inlet structure with guide vanes, including a spiral water suction chamber used as the inlet of the double-suction pump, wherein a curved guide vane is fixedly arranged horizontally in the spiral water suction chamber, and the bending direction of the guide vane is the same as the bending direction of the spiral water suction chamber; the end of the guide vane facing the inlet end of the spiral water suction chamber is semi-elliptical, and the end of the guide vane facing the outlet end of the spiral water suction chamber has an upper convex arc surface and a lower convex arc surface, and the upper convex arc surface and the lower convex arc surface intersect at the end of the guide vane and form an acute angle.

[0006] After entering the spiral suction chamber, water flows through the upper and lower sides of the guide vane. The semi-elliptical ends help optimize the fluid guidance path and reduce turbulence and energy loss when the fluid enters. The upper and lower convex arcs of the guide vane and the sharp-angled tail are conducive to the smooth transition of the fluid and reduce flow resistance. The bending direction of the guide vane is consistent with the bending direction of the spiral suction chamber. This design can enhance the guidance of the fluid and further improve the suction efficiency and overall performance of the pump. At the same time, this design avoids the use of complex external mechanisms and maintains the simplicity of the structure.

[0007] Optionally, the middle profile of the guide vane is fitted by a Bezier curve, so that the shape of the guide vane can transition smoothly and will not hinder the passage of water flow.

[0008] Optionally, the middle profile of the guide vane is controlled by Bezier curve fitting with three control points, and the control points are S1 and S3 located at both ends, and S2 located between S1 and S3. Changing the positions of the control points S1 and S3 can adjust the positions of the inlet and outlet edges of the guide vane, and changing the position of the control point S2 can change the curvature of the guide vane profile, so as to facilitate the design and adjustment of the shape of the guide vane according to the specifications of the double-suction pump.

[0009] Optionally, the minor axis size of the semi-elliptical arc-shaped end of the guide blade is the same as the thickness of the guide blade, the major axis size of the semi-elliptical arc-shaped end of the guide blade is 1.4 to 2 times the thickness of the guide blade, and the acute angle is located on the middle profile of the guide blade. The semi-elliptical arc-shaped end of the guide blade smoothly transitions with the upper and lower surfaces of the main body of the guide blade, and the major axis size is greater than the thickness of the guide blade so that the water can be more smoothly divided into two groups of upper and lower flow channels when it just contacts the guide blade, thereby reducing flow resistance. The acute angle located on the middle profile of the guide blade can ensure that the water on the upper and lower sides remains layered as much as possible after merging instead of mixing with each other, so as to reduce the degree of turbulence and reduce resistance.

[0010] Optionally, the distance between the end of the guide vane facing the inlet end of the spiral water suction chamber and the inlet end of the spiral water suction chamber is X LE The distance between the end of the guide vane away from the inlet of the spiral water suction chamber and the inlet of the spiral water suction chamber is X TE The inner diameter of the entrance of the spiral water absorption chamber is D S ,but:

[0011] X LE / D S =0.15~0.25

[0012] X TE / D S =0.7~0.8

[0013] The distance between the end of the guide vane facing the inlet end of the spiral water absorption chamber and the inner wall of the top of the spiral water absorption chamber is Y LE The distance between the end of the guide vane away from the inlet end of the spiral water absorption chamber and the top inner wall of the spiral water absorption chamber is Y TE ,but:

[0014] Y LE / D S =0.45~0.55

[0015] Y TE / D S =0.4~0.6

[0016] The thickness of the guide vane is 0.035-0.045 times the inner diameter of the spiral water absorption chamber entrance.

[0017] The end of the guide vane near the entrance of the spiral water absorption chamber is basically located near the middle of the spiral water absorption chamber in the vertical direction, which can keep the upper and lower stratified water basically at the same flow rate, avoiding the violent mixing caused by the different flow rates after mixing at the tail of the guide vane, resulting in increased resistance. Thinner guide vanes can reduce the occupation of the cross-sectional area of ​​the spiral water absorption chamber and reduce the impact on the flow rate.

[0018] Optionally, both ends of the guide blade are fixedly connected to the inner wall of the spiral water absorption chamber.

[0019] A double-suction pump adopts any of the double-suction pump inlet structures with guide vanes as shown above. Since the double-suction pump adopts the guide vanes, the turbulence degree of water when entering the inside is reduced, and higher flow efficiency and lower energy consumption can be achieved, thereby improving the comprehensive performance of the double-suction pump.

[0020] The technical solution of this application has the following beneficial effects compared with the prior art:

[0021] The addition of the guide vanes enables the double-suction pump to achieve higher flow efficiency and lower energy consumption during operation, thereby improving the comprehensive performance of the double-suction pump. The invention has a simple structure, is easy to implement, and does not require the addition of complex external mechanisms. It has a significant performance improvement effect, can effectively reduce energy consumption and improve work efficiency. Therefore, the technical solution of the present application has strong practical application value and promotion potential, especially in industrial fields that require efficient pumping of fluids, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is the front view of the double-suction pump;

[0024] Figure 2 It is a schematic diagram of the inlet structure of a double-suction pump with guide vanes;

[0025] Figure 3 It is a schematic diagram of the overall structure of a double-suction pump.

[0026] Icons: 1. Spiral water absorption chamber; 2. Guide vane; 3. Upper convex arc surface; 4. Lower convex arc surface; 5. Sharp angle; 6. Middle profile line; 7. Centrifugal impeller; 8. Volute; 9. Water outlet channel. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application 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 application and are not used to limit the present application.

[0028] Embodiment 1:

[0029] This embodiment provides a double-suction pump inlet structure with guide vanes, based on Figure 1 and Figure 2 As shown, it includes a spiral water suction chamber 1 used as the inlet of a double-suction pump, and a curved guide vane 2 is fixed and horizontally arranged in the spiral water suction chamber 1, and the curvature direction of the guide vane 2 is the same as the curvature direction of the spiral water suction chamber 1. The end of the guide vane 2 facing the inlet end of the spiral water suction chamber 1 is in a semi-elliptical arc shape, and the end of the guide vane 2 facing the outlet end of the spiral water suction chamber 1 has an upper convex arc surface 3 and a lower convex arc surface 4, and the upper convex arc surface 3 and the lower convex arc surface 4 intersect at the end of the guide vane 2 and form an acute angle 5.

[0030] When water enters from the inlet of the spiral water absorption chamber 1, it will contact the end of the guide blade 2 in the shape of a semi-elliptical arc and form two flow channels located above and below the guide blade 2, which will flow along the upper and lower sides of the guide blade 2. The water on the upper and lower sides converges at the sharp corner 5 at the tail of the guide blade 2. The semi-elliptical end helps to optimize the guiding path of the fluid and reduce turbulence and energy loss when the fluid enters. The tail of the guide blade 2, which is convexly arc-shaped and forms an acute angle 5, is conducive to the smooth transition of the fluid and reduces flow resistance. The bending direction of the guide blade 2 is consistent with the bending direction of the spiral water absorption chamber 1. This design can enhance the guiding property of the fluid and further improve the suction efficiency and overall performance of the pump. At the same time, the design avoids the use of complex external mechanisms and maintains the simplicity of the structure.

[0031] It should be noted that the present application provides a double suction pump inlet structure with a guide vane, and the guide vane 2 is located in the spiral water suction chamber 1. The guide vane 2 is close to the inlet and is not arranged at the flow channel bifurcation before entering the centrifugal impeller 7.

[0032] Further, based on Figure 2 As shown, the middle profile 6 of the guide blade 2 is fitted by the Bezier curve, and the middle profile 6 refers to the middle symmetry line of the guide blade 2, specifically, the distance from any point on the middle profile 6 to the surface of the guide blade 2 located on the upper and lower sides of the point is equal. The middle profile 6 fitted by the Bezier curve allows the shape of the guide blade 2 to transition smoothly without hindering the passage of water. Specifically in this embodiment, the middle profile 6 of the guide blade 2 is controlled by the Bezier curve fitting of three control points, and the control points are S1 and S3 located at both ends, and S2 located between S1 and S3. Changing the positions of the control points S1 and S3 can adjust the positions of the inlet and outlet edges of the guide blade 2, and changing the position of the control point S2 can change the curvature of the profile of the guide blade 2, which is convenient for designing and adjusting the shape and size of the guide blade 2 according to the specifications of the double-suction pump.

[0033] Further, based on Figure 2 As shown, the minor axis dimension 2b of the semi-elliptical arc-shaped end of the guide blade 2 is the same as the thickness of the guide blade 2, the major axis dimension 2a of the semi-elliptical arc-shaped end of the guide blade 2 is 1.4 to 2 times the thickness of the guide blade 2, and the acute angle 5 is located on the middle mold line 6 of the guide blade 2. The semi-elliptical arc-shaped end of the guide blade 2 and the upper and lower surfaces of the main part of the guide blade 2 are smoothly transitioned, and the major axis dimension greater than the thickness of the guide blade 2 allows the water to be more smoothly divided into the upper and lower groups of flow channels when it just contacts the guide blade 2, thereby reducing the flow resistance. The acute angle 5 located on the middle mold line 6 of the guide blade 2 can ensure that the water on the upper and lower sides remains layered as much as possible after merging instead of mixing with each other, so as to reduce the degree of turbulence and reduce resistance.

[0034] Both ends of the guide vane 2 are fixedly connected to the inner wall of the spiral water absorption chamber 1, which can be achieved by integral casting, welding or bolt connection.

[0035] Further, based on Figure 2 As shown, the distance between the end of the guide vane 2 facing the inlet end of the spiral water suction chamber 1 and the inlet of the spiral water suction chamber 1 is X LE The distance between the end of the guide vane 2 away from the inlet end of the spiral water suction chamber 1 and the inlet end of the spiral water suction chamber 1 is X TE The inner diameter of the entrance of the spiral water absorption chamber 1 is D S ,but:

[0036] X LE / D S =0.15~0.25

[0037] X TE / D S =0.7~0.8

[0038] The distance between the end of the guide vane 2 facing the inlet end of the spiral water absorption chamber 1 and the top inner wall of the spiral water absorption chamber 1 is Y LE The distance between the end of the guide vane 2 away from the inlet end of the spiral water absorption chamber 1 and the top inner wall of the spiral water absorption chamber 1 is Y TE ,but:

[0039] Y LE / D S =0.45~0.55

[0040] Y TE / D S =0.4~0.6

[0041] It should be noted that the distance between the end of the guide vane 2 away from the inlet end of the spiral water absorption chamber 1 and the top inner wall of the spiral water absorption chamber 1 is Y TE The design needs to be performed while ensuring that the guide vane 2 and the spiral water absorption chamber 1 have the same bending direction. The thickness of the guide vane 2 is 0.035-0.045 times the inner diameter of the spiral water absorption chamber 1 at the inlet.

[0042] Specifically, this embodiment uses a specific speed of 1480r / min and a design flow rate of 500m 3 / h, a double suction pump with an inner diameter of 154 mm for the inlet of the centrifugal impeller 7 and an inner diameter of 250 mm for the inlet of the spiral suction chamber 1 is used as an example. The distance X between the end of the guide vane 2 facing the inlet end of the spiral suction chamber 1 and the inlet of the spiral suction chamber 1 is LE =47.5mm, the inner diameter D of the entrance of the spiral water absorption chamber 1 SThe distance X between the end of the guide vane 2 away from the inlet end of the spiral water suction chamber 1 and the inlet end of the spiral water suction chamber 1 is TE =177.5mm, the inner diameter D of the entrance of the spiral water absorption chamber 1 S The distance Y between the end of the guide vane 2 facing the inlet end of the spiral water absorption chamber 1 and the top inner wall of the spiral water absorption chamber 1 is LE =125mm, the inner diameter D of the entrance of the spiral water absorption chamber 1 S The distance between the end of the guide vane 2 away from the inlet end of the spiral water absorption chamber 1 and the top inner wall of the spiral water absorption chamber 1 is Y TE =112.5mm, the inner diameter D of the entrance of the spiral water absorption chamber 1 S The thickness of the guide blade 2 is 10 mm, which is the inner diameter D of the suction port of the spiral suction chamber 1. S The size of the major axis 2a is 15 mm, which is 1.5 times the size of the minor axis 2b, and the angle of the acute angle 5 is 25 degrees. Under this working condition, after adding the guide vane 2, the efficiency of the double suction pump increases by about 2%.

[0043] Of course, the above is only an example and is not intended to be a limitation of the present application. Depending on the actual working conditions, the effect of improving the efficiency of the double-suction pump can be achieved within the corresponding size and ratio range specified in the present application.

[0044] The end of the guide blade 2 near the entrance of the spiral water absorption chamber 1 is basically located near the middle position of the spiral water absorption chamber 1 in the vertical direction, which can keep the upper and lower stratified water basically at the same flow rate, avoiding the violent mixing caused by the different flow rates after mixing at the tail of the guide blade 2, resulting in increased resistance. The thinner guide blade 2 can reduce the occupation of the cross-sectional area of ​​the spiral water absorption chamber 1 and reduce the impact on the flow rate.

[0045] Embodiment 2:

[0046] This embodiment provides a double-suction pump, which adopts the double-suction pump inlet structure with guide vanes shown in Example 1. It is specifically assembled from a spiral water suction chamber 1, a guide vane 2, a centrifugal impeller 7, a volute 8 and a water outlet channel 9. The connection method of the spiral water suction chamber 1, the centrifugal impeller 7, the volute 8 and the water outlet channel 9 is the same as that of the existing double-suction pump, and will not be repeated. Since the double-suction pump adopts the guide vane 2, the turbulence degree of water when entering the interior is reduced, and higher flow efficiency and lower energy consumption can be achieved, thereby improving the comprehensive performance of the double-suction pump.

[0047] In actual use, the centrifugal impeller 7 rotates to form a vacuum in the double-suction pump chamber, producing a suction effect on the water flow. Under the action of the double-suction pump centrifugal impeller 7, the water flow enters from the suction port of the spiral water suction chamber 1, flows through the guide vane 2, reduces the flow separation phenomenon inside the spiral water suction chamber 1 and the reflux phenomenon at the outlet, improves the inflow state of the centrifugal impeller 7, and then is discharged through the volute 8 and the water outlet pipe.

[0048] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A double suction pump inlet structure with guide vanes, comprising a spiral water suction chamber (1) serving as the double suction pump inlet, characterized in that: A curved guide vane (2) is fixedly disposed transversely in the spiral water absorption chamber (1), and the curvature direction of the guide vane (2) is the same as the curvature direction of the spiral water absorption chamber (1); The end of the guide blade (2) facing the inlet end of the spiral water absorption chamber (1) is in the shape of a semi-elliptical arc, and the end of the guide blade (2) facing the outlet end of the spiral water absorption chamber (1) has an upper convex arc surface (3) and a lower convex arc surface (4), and the upper convex arc surface (3) and the lower convex arc surface (4) intersect at the end of the guide blade (2) to form an acute angle (5).

2. The double-suction pump inlet structure with guide vanes according to claim 1, characterized in that: The middle profile (6) of the guide vane (2) is fitted using a Bezier curve.

3. The double-suction pump inlet structure with guide vanes as claimed in claim 2, characterized in that: The middle profile (6) of the guide vane (2) is controlled by Bezier curve fitting using three control points, wherein the control points are S1 and S3 located at the two ends, and S2 located between S1 and S3.

4. The double-suction pump inlet structure with guide vanes according to claim 1, characterized in that: The minor axis dimension of the semi-elliptical arc-shaped end of the guide blade (2) is the same as the thickness of the guide blade (2), the major axis dimension of the semi-elliptical arc-shaped end of the guide blade (2) is 1.4 to 2 times the thickness of the guide blade (2), and the acute angle (5) is located on the middle profile (6) of the guide blade (2).

5. The double-suction pump inlet structure with guide vanes as claimed in claim 1, 2, 3 or 4, characterized in that: The distance between the end of the guide blade (2) facing the inlet end of the spiral water absorption chamber (1) and the inlet end of the spiral water absorption chamber (1) is X. LE The distance between the end of the guide vane (2) away from the inlet end of the spiral water absorption chamber (1) and the inlet end of the spiral water absorption chamber (1) is X TE The inner diameter of the entrance of the spiral water absorption chamber (1) is D S ,but: X LE / D S =0.15~0.25 X TE / D S =0.7~0.8 The distance between the end of the guide blade (2) facing the inlet end of the spiral water absorption chamber (1) and the top inner wall of the spiral water absorption chamber (1) is Y. LE The distance between the end of the guide vane (2) away from the inlet end of the spiral water absorption chamber (1) and the top inner wall of the spiral water absorption chamber (1) is Y. TE ,but: Y LE / D S =0.45~0.55 Y TE / D S =0.4~0.6 The thickness of the guide blade (2) is 0.035-0.045 times the inner diameter of the inlet of the spiral water absorption chamber (1).

6. The double-suction pump inlet structure with guide vanes as claimed in claim 1, 2, 3 or 4, characterized in that: Both ends of the guide blade (2) are fixedly connected to the inner wall of the spiral water absorption chamber (1).

7. A double suction pump, characterized in that: A double-suction pump inlet structure with guide vanes as described in any one of claims 1 to 6 is adopted.

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