Large bulb tubular pump device capable of inhibiting tail vortex structure

Abstract

The invention provides a large bulb tubular pump device capable of inhibiting a tail vortex structure, which comprises a bulb body positioned in a bulb body runner and a flow guide pier positioned in a water outlet runner, the flow guide pier is positioned behind the bulb body, one end of the flow guide pier extends to the outline of the tail of the bulb body, and the other end of the flow guide pier extends to the tail of the bulb body. The flow loss between the flow guide pier and the tail of the bulb body is reduced. The extension line of the outline of the tail of the bulb body is tangent to the thickness of the flow guide pier and used for restraining generation of tail vortexes. The tail portion of the bulb body is fused with the flow guide pier, an effective supporting structure is provided for the lengthened bulb body, the mechanical strength and stability of the whole device are enhanced, the reasonable design of the flow guide pier ensures that no obvious local flow loss is generated when fluid passes through the area, and the flow guide pier is more stable. Meanwhile, the durability of the equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bulb tubular pumps, and in particular to a large bulb tubular pump device capable of suppressing a tail vortex structure. Background Art

[0002] As a highly efficient hydraulic machine, large bulb tubular pumps are widely used in large water conservancy projects, urban water supply, sewage treatment and other fields. In these applications, the stability and efficiency of the pump device are crucial to the operation of the entire system. However, during the operation of the tubular pump, its tail flow field often produces a complex vortex structure, especially in large and even extra-large tubular pump units. The vibration and noise caused by the tail vortex will be more serious, which will also have a great impact on the stability of the system. In addition, this vortex will also cause hydraulic loss, affect the overall efficiency of the pump, and thus have an adverse effect on the long-term operation of the device.

[0003] In existing large bulb cross-flow pump units, a specific bulb body structure is usually used to weaken the vortex. The ratio of the length of the tail of the bulb body to the maximum diameter of the bulb body is usually between 0.5-1.5. However, for large or extra-large bulb cross-flow pump units, it is usually impossible to effectively eliminate the tail vortex. Increasing the length of the tail of the bulb body can weaken the vortex phenomenon caused by flow separation to a certain extent, but it will cause the size and weight of the bulb body to increase, which is a great test for the fixation of the bulb body and the structural stability. In addition, due to the influence of components such as the bulb body support structure, undesirable flow states such as bias flow and secondary flow are also more obvious. Therefore, designing a more efficient and simple tail vortex suppression structure has become an urgent problem to be solved in the field of large bulb cross-flow pumps. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a large bulb tubular pump device that can suppress the tail vortex structure. By integrating the tail of the bulb body with the guide pier, it not only provides an effective support structure for the lengthened bulb body, but also enhances the mechanical strength and stability of the entire device. The reasonable design of the guide pier ensures that the fluid will not produce obvious local flow losses when passing through this area, and at the same time improves the durability of the equipment. The extension line of the tail contour of the bulb body is tangent to the thickness of the guide pier, which can effectively reduce the vortex intensity of the tail flow field, thereby improving the operating efficiency of the pump device, reducing vibration and noise, and extending the service life of the equipment.

[0005] The present invention achieves the above technical objectives through the following technical means.

[0006] A large bulb cross-flow pump device capable of suppressing a tail vortex structure comprises a bulb body located in a bulb body flow channel and a guide pier located in a water outlet flow channel, wherein the guide pier is located behind the bulb body and one end of the guide pier extends to the contour of the bulb body tail, so as to reduce the flow loss between the guide pier and the bulb body tail.

[0007] Furthermore, the extension line of the tail contour of the bulb body is tangent to the guide pier, so as to suppress the generation of tail vortex.

[0008] Furthermore, the bulb body is supported by an upper support and a lower support in the bulb body flow channel, and the upper and lower parts of one end of the guide pier are respectively connected to the upper support and the lower support, thereby evenly dividing the bulb body flow channel and the water outlet flow channel into two parts, which is used to suppress bias flow, avoid adverse flow states in the flow field, and ensure that the fluid flows out stably and efficiently along a predetermined path.

[0009] Furthermore, the bulb body includes a guide vane diffuser section, a cylindrical section and a tail cone section, and the guide vane diffuser section, the cylindrical section and the tail cone section are connected in sequence according to the flow direction; the surface of the guide vane diffuser section is used to install the guide vane, the cylindrical section is used to place the power unit, and one end of the guide pier extends to the tail cone section.

[0010] Furthermore, the minimum distance from the tangent point where the extension line of the tail cone section is tangent to the guide pier to the cylindrical section is l4, and the diameter of the tangent point is d2, satisfying the following relationship:

[0011] Wherein: d is the outer diameter of the cylindrical section; the length of the tail cone section l2=0.5l4.

[0012] The length of the tail cone section l2 = (3-4.5) d, so that the length of the bulb body is greatly extended, which slows down the diffusion and separation of the fluid in the flow channel and effectively suppresses the generation of tail vortex. The bulb body is truncated at the position where it merges with the guide pier, which reduces the length and weight of the bulb and reduces the production cost while ensuring stable flow.

[0013] Furthermore, the upper support and the lower support are both hollow structures, and the hollow structures of the upper support and the lower support are respectively connected to the cylindrical section of the bulb body to facilitate the maintenance of the equipment; the axial length l6 of the upper support is greater than the axial length l7 of the lower support, where l6 = (3.8 ~ 4.2) D, l8 = (1.5 ~ 2.0) D, and D is the impeller diameter at the front end of the bulb body.

[0014] Furthermore, the distance from one side of the upper support or the lower support to the center of the impeller is l5 = (1.5-2.0) D, where D is the diameter of the impeller. The purpose is to shift the position of the upper support and the lower support backward from the center of the impeller, which can reduce the impact loss of the fluid and improve the operating efficiency of the device.

[0015] Furthermore, one end of the guide pier is stepped, the stepped upper part is connected to the upper support, the stepped lower part is connected to the lower support, the axial length of the stepped upper part of the guide pier is l7=(4.5~5.5)D, the axial length of the stepped lower part of the guide pier is l9=(6.8~7.7)D, and l6+l7=l8+l9.

[0016] Furthermore, the front half of the tail cone section connected to the cylindrical section is a hollow steel structure, and the rear half of the tail cone section is a concrete structure.

[0017] The beneficial effects of the present invention are:

[0018] 1. The large-scale bulb cross-flow pump device capable of suppressing the tail vortex structure described in the present invention provides an effective support structure for the lengthened bulb body by integrating the tail of the bulb body with the guide pier, and also enhances the mechanical strength and stability of the entire device. The reasonable design of the guide pier ensures that no obvious local vortex is generated when the fluid passes through the area, while improving the durability of the equipment.

[0019] 2. The large-scale bulb cross-flow pump device capable of suppressing the tail vortex structure described in the present invention has a greatly extended length of the tail cone of the bulb body, which significantly improves the flow separation and vortex phenomenon at the tail of the bulb body, reduces the energy loss in the wake area, guides the flow field more smoothly, and improves the overall hydraulic performance; the upper and lower support structures not only extend the effective length of the support, but also play a role in optimizing the flow guidance while supporting the bulb body. Such upper and lower support structures can effectively suppress the residual circumferential velocity at the guide vane outlet, thereby reducing the formation of vortices and the energy loss caused thereby.

[0020] 3. The large-scale bulb cross-flow pump device capable of suppressing the tail vortex structure described in the present invention, the combination of the upper and lower supporting structures and the guide piers evenly divides the bulb body flow channel and the water outlet flow channel into two parts, which can effectively suppress the occurrence of bias flow, avoid unfavorable flow states in the flow field, and ensure that the fluid flows out stably and efficiently along a predetermined path.

[0021] 4. In the large bulb tubular pump device capable of suppressing the tail vortex structure of the present invention, the support structure is offset backward from the impeller, which can reduce the impact loss of the fluid. The bulb body is cut off at the position where it merges with the guide pier, which reduces the length and weight of the bulb and reduces the production cost while ensuring the stability of the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of a bulb flow pump in the prior art.

[0024] Figure 2 This is a schematic structural diagram of a large bulb tubular pump device capable of suppressing a tail vortex structure as described in the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the bulb body of the present invention.

[0026] Figure 4 It is a schematic diagram of the upper and lower supports and guide pier structure of the present invention.

[0027] Figure 5 The velocity flow field distribution diagram of the bulb throughflow pump device in the prior art.

[0028] Figure 6 It is the velocity flow field distribution diagram of the bulb throughflow pump device of the present invention.

[0029] Figure 7 This is a schematic diagram of the vortex at the tail of a bulb of a bulb tubular pump in the prior art.

[0030] Figure 8 A schematic diagram of the vortex at the tail of the bulb body of the bulb crossflow pump device designed for the present invention.

[0031] In the figure:

[0032] 1-water inlet channel; 2-impeller channel; 3-guide vane channel; 4-bulb body channel; 5-water outlet channel; 6-water inlet guide pier; 7-impeller; 8-guide vane; 9-upper support; 10-guide pier; 11-lower support; 12-bulb body. 12-1-guide vane diffuser section; 12-2-cylindrical section; 12-3-tail cone section. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] like Figure 1 As shown, the structure of the bulb cross-flow pump of the prior art includes an inlet flow channel 1, an impeller flow channel 2, a guide vane flow channel 3, a bulb body flow channel 4 and a water outlet flow channel 5 which are connected in sequence according to the flow direction; a water inlet guide pier 6 is placed in the water inlet flow channel 1, a bulb body 12 is installed in the bulb body flow channel 4 through an upper support 9 and a lower support 11, a guide vane 8 is installed on the shell at one end of the bulb body 12, and the guide vane 8 is located in the guide vane flow channel 3, a rotatable impeller 7 is installed at one end of the bulb body 12, and the impeller 7 is located in the impeller flow channel 2, a guide pier 10 is placed in the water outlet flow channel 5, and is located in front of the bulb body 12, and is not connected to the guide pier 10, so that a complex vortex is generated. Moreover, the ratio of the length of the tail of the existing bulb body 12 to the maximum diameter of the bulb body is usually between 0.5-1.5. A power device is arranged in the bulb body 12, and the power device includes a motor, a rotating shaft, a coupling and a power supply device, etc. The motor is a multi-stage motor, and the power supply is a three-phase AC power supply.

[0037] like Figure 2As shown, the large-scale bulb cross-flow pump device capable of suppressing the tail vortex structure described in the present invention has a contour in which one end of the guide pier 10 extends to the tail of the bulb body 12, which can reduce the flow loss between the guide pier 10 and the tail of the bulb body 12, ensuring that no obvious local flow loss will occur when the fluid passes through this area, while improving the durability of the equipment.

[0038] like Figure 3 As shown, the extension line of the tail contour of the bulb body 12 is tangent to the two sides of the guide pier 10, and the length of the tail cone section 12-3 of the bulb body is greatly extended, which significantly improves the flow separation and vortex phenomenon at the tail of the bulb body, reduces the energy loss in the wake area, and guides the flow field more smoothly, improving the overall hydraulic performance; it is used to suppress the generation of tail vortex. The bulb body 12 includes a guide vane diffuser section 12-1, a cylindrical section 12-2 and a tail cone section 12-3, and the guide vane diffuser section 12-1, the cylindrical section 12-2 and the tail cone section 12-3 are connected in sequence according to the flow direction; the surface of the guide vane diffuser section 12-1 is used to install the guide vane 8, and the cylindrical section 12-2 is used to place the power unit, and one end of the guide pier 10 extends to the tail cone section 12-3.

[0039] The front half of the tail cone section 12-3 connected to the cylindrical section 12-2 is a hollow steel structure, and the rear half of the tail cone section 12-3 is a concrete structure, which has high structural strength and low economic cost.

[0040] The minimum distance from the tangent point where the extension line of the tail cone section 12-3 is tangent to the guide pier 10 to the cylindrical section 12-2 is l4, and the diameter of the tangent point is d2, satisfying the following relationship:

[0041] Wherein: d is the outer diameter of the cylindrical section 12-2;

[0042] The bulb cross-flow pump unit described in the present invention is a large or extra-large bulb cross-flow pump unit, and the ratio of the length of the tail of the bulb body to the diameter of the bulb body exceeds 3, so the length of the tail cone section 12-3 is l2=0.5l4, that is, the length of the tail cone section 12-3 is l2=(3~4.5)d. The bulb body 12 described in the present invention is the bulb body of a large or extra-large bulb cross-flow pump unit.

[0043] like Figure 4 As shown, the bulb body 12 is supported in the bulb body flow channel 4 by the upper support 9 and the lower support 11, and the upper and lower parts of one end of the guide pier 10 are respectively connected to the upper support 9 and the lower support 11, and the bulb body flow channel 4 and the water outlet flow channel 5 are evenly divided into two parts for suppressing the deviation flow. The upper support 9 and the lower support 11 not only extend the effective length of the support, but also play a role in optimizing the flow guidance while supporting the bulb body. This upper and lower support structure can effectively suppress the residual circumferential velocity at the outlet of the guide vane, thereby reducing the formation of vortices and the energy loss caused thereby.

[0044] The upper support 9 and the lower support 11 are both hollow structures, and the hollow structures of the upper support 9 and the lower support 11 are respectively connected to the cylindrical section 12-2 of the bulb body 12, which can facilitate maintenance personnel to enter the bulb body 12 for maintenance; the axial length l6 of the upper support 9 is greater than the axial length l7 of the lower support 11, wherein l6=(3.8~4.2)D, l8=(1.5~2.0)D, and D is the diameter of the impeller 7 at the front end of the bulb body 12.

[0045] like Figure 4 As shown, the distance l5 from the left side of the upper support 9 and the left side of the lower support 11 to the center of the impeller 7 is (1.5-2.0)D, where D is the diameter of the impeller 7. Compared with the structure of the prior art, the support structure of the present invention is offset backward from the impeller, which can reduce the impact loss of the fluid and improve the operating efficiency of the device. One end of the guide pier 10 is stepped, the stepped upper part is connected to the upper support 9, and the stepped lower part is connected to the lower support 11. The axial length of the stepped upper part of the guide pier 10 is l7=(4.5-5.5)D, the axial length of the stepped lower part of the guide pier 10 is l9=(6.8-7.7)D, and l6+l7=l8+l9. The guide pier 10 is made of concrete, which can reduce costs and improve structural strength. The thickness l of the upper support 9, the lower support 11 and the guide pier 10 is 10 It is the same as the diameter d2 at the tangent point of the extended line of the coccygeal segment.

[0046] The tail of the bulb body 12 is integrated with the guide pier 10, and the guide pier is used to provide effective support for the lengthened tail of the bulb body, and the mechanical strength and stability of the overall device are enhanced. The combination of the upper support 9, the lower support 11 and the guide pier 10 evenly divides the bulb body flow channel and the water outlet flow channel into two parts, effectively suppressing the occurrence of bias flow, avoiding the undesirable flow state in the flow field, and ensuring that the fluid flows out stably and efficiently along the predetermined path.

[0047] When the system is running, the motor drives the impeller 7 of the water pump device to rotate, and the fluid enters from the water inlet channel 1, and after being pressurized by the impeller, enters the guide vane channel 3. The guide vane recovers the circulation of the fluid and reduces the spiral motion of the fluid. Then the fluid enters the bulb body channel 4, passes through the bulb body 12, the upper support 9, the lower support 11, the guide pier 10 and the bulb body channel 4, and flows out from the water outlet channel 5.

[0048] The impeller diameter of this case is 400mm, the impeller speed is 875rpm, the water flow rate is 580L / s, the overall length of the flow channel is 8.4m, and the head is 2.85m. The dimensions of the bulb body are l1=0.43m, d=0.41m, l2=1.875m, d2=0.12m, l4=3.75m. The dimensions of the upper and lower supports and guide piers are l6=1.73m, l7=2.03m, l8=0.72m, l9=3.04m, l 10 =0.12m, the distance from the support to the impeller center is l5=0.62m.

[0049] This case is converted according to the similarity criterion. The actual machine has an impeller diameter of 5.25m, a speed of 62.5rpm, a design head of 2.5m, and a water inlet flow of 100m 3 / s, which is an extra-large bulb cross-flow pump unit.

[0050] Figure 5 and Figure 6 This case uses the traditional bulb structure and the large bulb throughflow pump device of the present invention. The velocity distribution cloud diagram and vector diagram of the axis axis surface. It can be clearly seen that Figure 5 and Figure 7 As shown in the figure, with the traditional bulb structure, the velocity distribution of the tail flow field is uneven, there is an obvious large-scale vortex area at the tail of the bulb, and the deviation phenomenon is also more serious. Figure 6 and Figure 8 As shown, the velocity distribution of the tail flow field of the bulb tubular pump designed by the present invention is uniform, without obvious vortex and backflow, and it can be seen that the flow state has been greatly improved. By comparing the hydraulic loss and efficiency, it can be found that the hydraulic loss of the bulb body flow channel and the water outlet flow channel of the bulb tubular pump device of the present invention is greatly reduced, and the overall efficiency is improved by 8.6%.

[0051] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0052] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A large bulb throughflow pump device capable of suppressing a tail vortex structure, comprising a bulb body (12) located in a bulb body flow channel (4) and a guide pier (10) located in a water outlet flow channel (5), wherein the guide pier (10) is located behind the bulb body (12), and characterized in that: One end of the guide pier (10) extends to the contour of the tail of the bulb body (12), so as to reduce the flow loss between the guide pier (10) and the tail of the bulb body (12).

2. The large bulb throughflow pump device capable of suppressing the tail vortex structure according to claim 1, characterized in that: The extension line of the tail contour of the bulb body (12) is tangent to the guide pier (10), so as to suppress the generation of tail vortex.

3. The large bulb throughflow pump device capable of suppressing the tail vortex structure according to claim 1, characterized in that: The bulb body (12) is supported in the bulb body flow channel (4) by an upper support (9) and a lower support (11), and the upper and lower parts of one end of the guide pier (10) are respectively connected to the upper support (9) and the lower support (11), so as to evenly divide the bulb body flow channel (4) and the water outlet flow channel (5) into two parts, thereby suppressing biased flow.

4. The large bulb throughflow pump device capable of suppressing the tail vortex structure according to claim 3 is characterized in that: The bulb body (12) comprises a guide vane diffuser section (12-1), a cylindrical section (12-2) and a tail cone section (12-3); the guide vane diffuser section (12-1), the cylindrical section (12-2) and the tail cone section (12-3) are connected in sequence according to the flow direction; the surface of the guide vane diffuser section (12-1) is used to install the guide vane (8), the inside of the cylindrical section (12-2) is used to place the power unit, and one end of the guide pier (10) extends to the tail cone section (12-3).

5. The large bulb throughflow pump device capable of suppressing the tail vortex structure according to claim 4, characterized in that: The minimum distance from the tangent point where the extension line of the tail cone section (12-3) is tangent to the guide pier (10) to the cylindrical section (12-2) is l4, and the diameter of the tangent point is d2, satisfying the following relationship: l4=(6~9)dd2=(0.2~0.6)d Where: d is the outer diameter of the cylindrical section (12-2); The length of the tail cone section (12-3) is l2=0.5l4.

6. The large bulb throughflow pump device capable of suppressing the tail vortex structure according to claim 3, characterized in that: The upper support (9) and the lower support (11) are both hollow structures, and the hollow structures of the upper support (9) and the lower support (11) are respectively connected to the cylindrical section (12-2) of the bulb body (12); the axial length l6 of the upper support (9) is greater than the axial length l7 of the lower support (11), wherein l6 = (3.8-4.2)D, l8 = (1.5-2.0)D, and D is the diameter of the impeller (7) at the front end of the bulb body (12).

7. The large bulb throughflow pump device capable of suppressing the tail vortex structure according to claim 3, characterized in that: The distance l5 from one side of the upper support (9) or one side of the lower support (11) to the center of the impeller (7) is (1.5-2.0)D, where D is the diameter of the impeller (7).

8. The large bulb throughflow pump device capable of suppressing the tail vortex structure according to claim 6, characterized in that: One end of the guide pier (10) is in a stepped shape, the stepped upper part is connected to the upper support (9), and the stepped lower part is connected to the lower support (11). The axial length of the stepped upper part of the guide pier (10) is l7=(4.5-5.5)D, the axial length of the stepped lower part of the guide pier (10) is l9=(6.8-7.7)D, and l6+l7=l8+l9.

9. The large bulb throughflow pump device capable of suppressing the tail vortex structure according to claim 4, characterized in that: The front half of the tail cone section (12-3) connected to the cylindrical section (12-2) is a hollow steel structure, and the rear half of the tail cone section (12-3) is a concrete structure.

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