Box culvert type water inlet flow channel vortex eliminating device and vertical axial flow pump set

Abstract

The utility model relates to the technical field of water pump design, and discloses a box culvert type water inlet flow channel vortex eliminating device and a vertical axial flow pump set, the box culvert type water inlet flow channel vortex eliminating device comprises a bottom plate and a vortex eliminating plate, the right side of the top of the bottom plate is fixedly connected with a water inlet pool rear wall, and the top of the water inlet pool rear wall is fixedly connected with a top plate; the right side of the vortex eliminating plate is fixedly connected to the left side of the water inlet pool rear wall, the top of the bottom plate is fixedly connected with a flow guide pier, the top of the flow guide pier communicates with a flow guide cone, the inner side of the top plate is fixedly connected with a vertical axial flow pump set, and a water inlet horn mouth is formed in the bottom of the vertical axial flow pump set. The output end of the vertical axial flow pump set is fixedly connected with a transmission shaft. According to the utility model, vortex smoothing is eliminated through the vortex eliminating plate, energy loss is reduced through the flow guide pier and the water inlet horn mouth, and water flow is further guided and accelerated through the flow guide cone, so that the water flow can enter a pump set more stably, and the water pumping efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of water pump design technology, and in particular to a vortex-eliminating device for a box culvert-type inlet channel and a vertical axial flow pump set. Background Technology

[0002] With the accelerated planning and construction of national and provincial water networks, in order to better leverage the benefits of flood control, disaster reduction, irrigation, and ecological restoration, it is planned to construct multiple large-flow, low-head axial flow pumping stations. The inlet channels used in conjunction with vertical axial flow pumps generally come in elbow-shaped, bell-shaped, scoop-shaped, inclined, and box culvert forms. Box culvert inlet channels are also known as closed inlet pools. In particular, the addition of a top plate on the top of the open inlet pool ensures that surface vortices are not easily generated at the inlet when water flows into the pool, providing good diversion conditions for the pumps. Given the simple structure and convenient construction of box culvert inlet channels, they are widely used in small and medium-sized axial flow pumping stations.

[0003] However, the axial flow pumping stations currently using box culvert-type inlet channels have poor water flow patterns at the pump inlet, which easily forms vortices that enter the pump interior, leading to severe pump cavitation and excessive vibration. This affects the safe and stable operation of the unit, significantly reduces unit efficiency, increases equipment energy consumption, and causes the abnormal vibration of the pump unit to lead to an increased unit failure rate, resulting in frequent equipment maintenance and a significantly reduced service life. It also poses a great safety hazard to the operation of the pumping station, threatening the lives and property of local people.

[0004] Given that most small and medium-sized axial flow pumps currently use box culvert-type inlet channels that are simple in structure and easy to construct, but this solution results in poor inlet flow and easily creates vortices on the bottom of the inlet pool that enter the pump, thus affecting the safe and stable operation of the unit, a box culvert-type inlet channel vortex-eliminating device and a vertical axial flow pump unit are proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a box culvert-type inlet flow channel vortex suppression device and a vertical axial flow pump unit. It aims to improve the existing technology of box culvert-type inlet flow channels for small and medium-sized axial flow pumps, which are mostly simple in structure and easy to construct. However, the water flow state of the pump in this scheme is poor, and it is very easy to form vortices on the bottom plate of the inlet pool and enter the pump, thereby affecting the safe and stable operation of the unit.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a box culvert-type inlet channel vortex suppression device and a vertical axial flow pump unit, comprising a base plate and a vortex suppression plate. The top right side of the base plate is fixedly connected to the rear wall of the inlet pool, and the top of the rear wall of the inlet pool is fixedly connected to a top plate. The right side of the vortex suppression plate is fixedly connected to the left side of the rear wall of the inlet pool. A flow guide pier is fixedly connected to the top of the base plate, and a flow guide cone communicates with the top of the flow guide pier. A vertical axial flow pump unit is fixedly connected to the inner side of the top plate. The bottom is equipped with a water inlet bell. The output end of the vertical axial flow pump unit is fixedly connected to a drive shaft. A stuffing box component is fixedly connected to the top of the outer wall of the vertical axial flow pump unit. Pump base plates are fixedly connected to the left and right sides of the outer wall of the vertical axial flow pump unit. A water-lubricated bearing is installed on the top of the guide cone. A connecting bolt is threaded to the left and right sides of the outer wall of the stuffing box component. A coupling is installed at the top of the drive shaft. A connecting bolt is threaded to the left and right sides of the outer wall of the coupling. A transmission mechanism is provided on the top of the top plate.

[0007] Through the above technical solutions—including the bottom plate, the rear wall of the inlet pool, the top plate, the vortex-eliminating plate, and the flow guiding device—and with the synergistic effect of the flow guiding piers and cones, by designing and optimizing the shape, position, and angle of these structures, the vortex volume at the flare opening can be significantly reduced, the inlet flow pattern can be improved, and the efficiency and stability of the entire system can be enhanced.

[0008] As a further description of the above technical solution:

[0009] The transmission mechanism includes a transmission device connected to the top of the transmission shaft. An asynchronous motor is fixedly connected to the top of the transmission device, and a support base is fixedly connected to the bottom of the transmission device.

[0010] The above technical solution enables the subsequent liquid flow through the cooperation of the transmission device and the asynchronous motor. The support base provides a stable foundation for the transmission device, ensuring its stability during operation and preventing displacement or tilting due to external forces or vibrations. This ensures the normal operation and efficiency of the entire system.

[0011] As a further description of the above technical solution:

[0012] The top left and right sides of the support base are provided with a connecting groove, and the bottom of the transmission device is threaded with a fixing bolt.

[0013] The above technical solution involves installing a fixing bolt into a connecting groove and threading the top of the fixing bolt to the transmission device to ensure the firmness between the support and the transmission device.

[0014] As a further description of the above technical solution:

[0015] The top plate has two connecting grooves on its top left and right sides, and the pump base plate has two fixing bolts threadedly connected to its inner side.

[0016] The above technical solution involves reinforcing the pump base plate and top plate with the same fixing bolts to ensure a tight fit between the pump base plate and achieve a sealing effect.

[0017] As a further description of the above technical solution:

[0018] The top of each base plate is provided with screw holes, and bolts are threaded into the inner side of the screw holes.

[0019] The above technical solution involves reinforcing the guide pier with bolts to ensure its stability during use.

[0020] As a further description of the above technical solution:

[0021] A sealing plate is fixedly connected to the inner side of the stuffing box component, and the inner side of the sealing plate is set on the outer wall of the drive shaft.

[0022] The above technical solution involves a sealing plate positioned between the stuffing box component and the drive shaft, which serves to seal the area and prevent liquid from leaking out.

[0023] This utility model has the following beneficial effects:

[0024] In this invention, the base plate, the rear wall of the inlet pool, and the top plate are tightly integrated to form a sealed space. When the water flows through the anti-vortex plate, its special shape and angle can guide the direction of the water flow, effectively dispersing and smoothing the water flow that might otherwise form vortices, thus achieving the effect of no vortexes at the bottom of the drive shaft. At the same time, the energy loss of the water flow when turning or changing direction is reduced by the guide cone and the inlet bell mouth, thereby improving the energy conversion efficiency of the entire system. The guide cone further guides and accelerates the water flow, allowing the water flow to enter the pump group more smoothly, further improving the pumping efficiency of the pump group. Compared with the inlet flow channel scheme without anti-vortex measures, the average vortex volume of the vortex core is reduced by 96%, the axial velocity distribution uniformity at the bell mouth reaches 95%, and the velocity weighted average angle reaches 86°, providing good inlet conditions for the water pump. Attached Figure Description

[0025] Figure 1 This is a front view of the vortex-eliminating device for a box culvert-type inlet channel and a vertical axial flow pump unit proposed in this utility model.

[0026] Figure 2 for Figure 1 A side view of the structural cross-section;

[0027] Figure 3 This utility model provides a cross-sectional view of the inlet channel of a box culvert-type water inlet channel vortex suppression device and a vertical axial flow pump unit.

[0028] Figure 4 for Figure 3 Enlarged view of point A;

[0029] Figure 5 for Figure 1 Enlarged view of point B.

[0030] Legend:

[0031] 1. Base plate; 2. Transmission mechanism; 201. Transmission device; 202. Asynchronous motor; 203. Support base; 204. Connecting groove one; 205. Fixing bolt one; 3. Rear wall of the inlet pool; 4. Top plate; 5. Anti-vortex plate; 6. Guide pier; 7. Guide cone; 8. Inlet bell mouth; 9. Vertical axial flow pump set; 10. Drive shaft; 11. Pump base plate; 12. Connecting groove two; 13. Fixing bolt two; 14. Screw hole; 15. Bolt; 16. Stuffing box assembly; 17. Water-lubricated bearing; 18. Connecting bolt one; 19. Sealing plate; 20. Connecting bolt two; 21. Coupling. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figure 1 , Figure 3 and Figure 5This utility model provides an embodiment of a box culvert-type inlet flow channel vortex suppression device and a vertical axial flow pump unit, including a base plate 1 and a vortex suppression plate 5. The top right side of the base plate 1 is fixedly connected to the rear wall 3 of the inlet pool, and the top of the rear wall 3 is fixedly connected to a top plate 4, forming a sealed space. The right side of the vortex suppression plate 5 is fixedly connected to the left side of the rear wall 3 of the inlet pool. The vortex suppression plate 5 can effectively reduce the vortex volume at the flared end. The top of the base plate 1 is fixedly connected to a guide... The top of the flow pier 6 is connected to the flow guide cone 7, and the two are connected by reinforcing bolts. The flow guide cone 7 is approximately cylindrical. A vertical axial flow pump unit 9 is fixedly connected to the inner side of the top plate 4. The vertical axial flow pump unit 9 consists of the main water pump and the main motor of the pump station, and adopts a layered arrangement scheme. The main water pump is arranged in the pump layer. The main water pump is a vertical axial flow pump unit 9. The bottom of the vertical axial flow pump unit 9 is equipped with a water inlet bell mouth 8. The output end of the vertical axial flow pump unit 9 is fixedly connected to a drive shaft. 10. A stuffing box component 16 is fixedly connected to the top of the outer wall of the vertical axial flow pump unit 9. A pump base plate 11 is fixedly connected to the left and right sides of the outer wall of the vertical axial flow pump unit 9. The pump base plate 11 adopts a water-sealing design to ensure that the pump layer is a dry environment. The guide pier 6 and the guide cone 7 are on the same axis as the pump inlet bell mouth 8. Their height is determined by the position of the pump impeller. The guide pier 6 and the guide cone 7 are streamlined in shape. A water-lubricated bearing 17 is installed on the top of the guide cone 7. A connecting bolt 18 is threaded on the left and right sides of the outer wall of the stuffing box component 16. A coupling 21 is installed at the top of the drive shaft 10. A connecting bolt 20 is threaded on the left and right sides of the outer wall of the coupling 21. A transmission mechanism 2 is set on the top of the top plate 4. A sealing plate 19 is fixedly connected to the inner side of the stuffing box component 16. The inner side of the sealing plate (19) is set on the outer wall of the drive shaft 10. The water-lubricated bearing 17 can realize the precise connection between the drive shaft 10 and the vertical axial flow pump unit 9.

[0034] Specifically, the base plate 1, the rear wall 3 of the inlet pool, and the top plate 4 form a sealed space. The vortex-eliminating plate is a rectangular concrete slab, 1980mm × 525mm (length × width), 80mm thick, made of C35W6F200, to block the underwater flow in the inlet pool and thus eliminate vortices. A guide cone 7 is installed above the guide pier 6, and the two are connected by reinforcing bolts. The guide cone 7 is approximately cylindrical. To eliminate the impact of construction errors on equipment installation, a 20mm gap is left between the guide cone 7 and the water-lubricated bearing 17 for adjustment. This device is designed to consist of the main water pump and the main motor of the pump station, using a layered arrangement scheme. The main water pump is located in the pump layer. The main water pump is a vertical axial flow pump unit 9, model 900ZLB-85, with a blade angle of 0° and a rated flow rate Qr = 2.47m³. The rated head Hr=5m, rated speed n=485r / min, impeller diameter D0=840mm, and pump base plate 11 are fixed on the left and right sides of the outer wall of the vertical axial flow pump set 9. The pump base plate 11 adopts a water-sealed design to ensure that the pump layer is a dry environment for convenient operation and management. The cross-section of the vertical axial flow pump set 9 is rectangular, with a height of 1980mm and a width of 2500mm. The guide pier 6 and guide cone 7 are on the same axis as the pump inlet bell mouth 8, and their height is determined by the position of the pump impeller. The guide pier 6 and guide cone 7 are streamlined. A water-lubricated bearing 17 is fixed at the bottom of the outer wall of the drive shaft 10. The stuffing box component 16 and the water-lubricated bearing 17 are connected by a connecting bolt 18. The water-lubricated bearing 17 enables precise connection between the drive shaft 10 and the vertical axial flow pump set 9.

[0035] Reference Figure 1 and Figure 2 The transmission mechanism 2 includes a transmission device 201, which is connected to the top end of the transmission shaft 10. An asynchronous motor 202 is fixedly connected to the top of the transmission device 201. The main motor and the transmission device 201 are arranged in the motor layer. The main motor is a low-voltage asynchronous motor 202. A support base 203 is fixedly connected to the bottom of the transmission device 201. The transmission device 201 is supported by the support base 203. The top left and right sides of the support base 203 are provided with connecting grooves 204. The bottom of the transmission device 201 is threaded with fixing bolts 205. The fixing bolts 205 are connected to the connecting grooves 204 and are threaded to the transmission device 201 through the top end to ensure the firmness between them.

[0036] Specifically, an asynchronous motor 202 is fixed to the top of the transmission device 201. The asynchronous motor 202 is the core power source of the entire transmission mechanism 2. The main motor and the transmission device 201 are arranged in the motor layer to ensure the stable operation of the system. The main motor is a low-voltage asynchronous motor 202, specifically model YE3-400L1-12, with a rated power of 185 kilowatts, a rated voltage of 380 volts, and a rated speed of 495 revolutions per minute. The transmission device 201 is provided with a stable support through the support base 203, and the fixing bolt 205 is connected to the connecting groove 204 of the support base 203. At the same time, its top end is threaded to the transmission device 201, thereby ensuring the firmness and stability between the two parts of the entire transmission mechanism.

[0037] Reference Figure 1 , Figure 2 and Figure 5 The top plate 4 has connecting grooves 12 on the left and right sides of the top, and the pump base plate 11 has a fixing bolt 13 threadedly connected to the inner side. The bottom plate 1 has screw holes 14 on the top, and bolts 15 are threadedly connected to the inner side of the screw holes 14.

[0038] Specifically, connecting grooves 12 are provided on the top left and right sides of the top plate 4. These grooves are for easy connection and fixation with components. At the same time, fixing bolts 13 are connected to the inner side of the pump base plate 11 by means of threads. This design ensures a stable connection between the pump base plate 11 and the top plate 4.

[0039] Working principle: The bottom plate 1, the rear wall 3 of the inlet pool, and the top plate 4 are tightly connected to form a sealed space. By utilizing the physical properties of the anti-vortex plate 5, the vortex volume at the funnel mouth is effectively reduced. Specifically, when the water flows through the anti-vortex plate 5, its special shape and angle can guide the direction of the water flow, effectively dispersing and smoothing the water flow that might otherwise form vortices, thus achieving the effect of no vortex at the bottom of the drive shaft 10. At the same time, in order to further optimize the water flow characteristics, the flow guiding device is divided into two parts: the flow guiding pier 6 and the flow guiding cone 7. The flow guiding pier 6 is set below the inlet funnel mouth 8 of the vertical axial flow pump group 9. Its streamlined shape design can keep it on the same axis as the pump inlet, ensuring smooth and efficient water flow. The principle is to improve the energy conversion efficiency of the entire system by reducing the energy loss when the water flow turns or changes direction. The flow guiding cone 7 plays a role in further guiding and accelerating the water flow, so that the water flow can enter the pump group more smoothly, further improving the pumping efficiency of the pump group.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A box culvert type inlet flow passage vortex eliminator and vertical shaft flow pump set, comprising a bottom plate (1) and a vortex eliminator plate (5), characterized in that: The top right side of the bottom plate (1) is fixedly connected with the back wall (3) of the water inlet pool, the top of the back wall (3) of the water inlet pool is fixedly connected with the top plate (4), the right side of the vortex plate (5) is fixedly connected with the left side of the back wall (3) of the water inlet pool, the top of the bottom plate (1) is fixedly connected with the guide pier (6), the top of the guide pier (6) is communicated with the guide cone (7), the inner side of the top plate (4) is fixedly connected with the vertical axial flow pump group (9), the bottom of the vertical axial flow pump group (9) is provided with the water inlet horn (8), the output end of the vertical axial flow pump group (9) is fixedly connected with the transmission shaft (10), the outer wall top of the vertical axial flow pump group (9) is fixedly connected with the packing gland part (16), the outer wall left and right sides of the vertical axial flow pump group (9) are fixedly connected with the pump foundation plate (11), the top of the guide cone (7) is provided with the water lubrication bearing (17), the outer wall left and right sides of the packing gland part (16) are both screw-connected with the connecting bolt one (18), the top end of the transmission shaft (10) is provided with the shaft coupling (21), the outer wall left and right sides of the shaft coupling (21) are both screw-connected with the connecting bolt two (20), the top of the top plate (4) is provided with the transmission mechanism (2).

2. The vortex breaker and vertical axial flow pump set of claim 1, wherein: The transmission mechanism (2) comprises a transmission device (201), the transmission device (201) is communicated at the top end of the transmission shaft (10), the top of the transmission device (201) is fixedly connected with the asynchronous motor (202), the bottom of the transmission device (201) is fixedly connected with the support seat (203).

3. The vortex breaker and vertical axial flow pump set of claim 2, wherein: The top left and right sides of the support seat (203) are both provided with the connecting groove one (204), the bottom of the transmission device (201) is screw-connected with the fixed bolt one (205) around.

4. The vortex breaker and vertical axial flow pump set of claim 1, wherein: The top left and right sides of the top plate (4) are provided with the connecting groove two (12), the inner side of the pump foundation plate (11) is screw-connected with the fixed bolt two (13).

5. The vortex breaker and vertical axial flow pump set of claim 1, wherein: The top of the bottom plate (1) is provided with the screw hole (14), the inner side of the screw hole (14) is screw-connected with the bolt (15).

6. The vortex breaker and vertical axial flow pump set of claim 1, wherein: The inner side of the packing gland part (16) is fixedly connected with the sealing plate (19), the inner side of the sealing plate (19) is arranged on the outer wall of the transmission shaft (10).

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