Pump station flow guide device and installation method thereof

Abstract

The invention discloses a pump station flow guiding device and an installation method thereof in the technical field of hydraulic engineering. The pump station flow guiding device comprises a center column, the center column is sleeved with a flow guiding cover, and the flow guiding cover is sleeved with an upper rotating wheel set and a lower rotating wheel set; the upper runner group and the lower runner group have the same structure and opposite rotating directions; the upper rotating wheel set and the lower rotating wheel set each comprise a top ring, a bottom ring and a fixing cylinder, the top rings and the bottom rings are fixedly connected with the fixing cylinders through supporting rods, a plurality of guide vanes are rotationally installed between the top rings and the bottom rings, a plurality of limiting rods are fixedly connected between the top rings and the bottom rings, and the limiting rods correspond to the guide vanes one to one and are located on the two sides of the middles of the guide vanes. The bottom of the top ring is rotationally connected with a control ring, the control ring is rotationally connected with the front ends of the guide vanes, and the control ring rotates to enable the guide vanes to deform and bend under the limitation of the limiting rods; the device is located at the inlet of the water inlet pipe, directly changes the inlet flow state, is obvious in effect, can be suitable for various pump stations, effectively uniformizes the flow speed and the flow state, and avoids the generation of cyclone in the middle.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy projects, and in particular to a pump station diversion device and an installation method thereof. Background Art

[0002] The water pump is a relatively important structure of the pumping station. When the water pump is running, if the flow velocity distribution is uneven, dead water areas, backflow areas and various vortices may appear, causing siltation in the pool, resulting in insufficient water intake for some units. In severe cases, the vortex will bring air into the water inlet channel (or suction pipe), greatly reducing the efficiency of the water pump and causing water pump cavitation and unit vibration.

[0003] In order to suppress the formation of vortices, most of the time, obstacles are set up to break the initial foundation of the vortex. Usually, fixed measures such as partition piers, guide piers, bottom sills, and vortex-eliminating plates are set to uniformly guide the flow state in the forebay, but the effect on the inlet flow state is limited; and in some pump stations with poor layout conditions and lateral water inlet pump stations, the center line of the forebay does not overlap with the center line of the main station body, and asymmetric vortices often exist in the forebay. In addition, multi-unit pump stations often choose to start units based on operating flow requirements, maintenance cycles and other conditions. In many cases, the start-up is not symmetrical, which also has a great impact on the flow state. Fixed measures cannot be adjusted according to the situation, resulting in poor inlet flow state, causing pump cavitation and unit vibration.

[0004] Based on this, the present invention designs a pump station diversion device and an installation method thereof to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a pump station diversion device and an installation method thereof to solve the problem that the fixed measures proposed in the above background technology cannot be adjusted according to the situation, resulting in poor inlet flow state, causing water pump cavitation and unit vibration.

[0006] To achieve the above object, the present invention provides the following technical solution: comprising a central column, the central column is provided with a guide cover on the outer shell, and the guide cover is provided with an upper rotor group and a lower rotor group on the outer shell; The upper impeller group and the lower impeller group have the same structure and rotate in opposite directions, so as to prevent the formation of vortices; The upper rotating wheel group and the lower rotating wheel group each include a top ring, a bottom ring and a fixed cylinder, the top ring and the bottom ring are both fixedly connected to the fixed cylinder through a support rod, a plurality of guide vanes are rotatably mounted between the top ring and the bottom ring, a plurality of groups of limiting rods are fixedly connected between the top ring and the bottom ring, the limiting rods correspond to the guide vanes one by one and are located on both sides of the middle of the guide vanes; The bottom of the top ring is rotatably connected with a control ring, and the control ring is rotatably connected with the front end of the guide vane. The rotation of the control ring causes the guide vane to deform and bend under the restriction of the restriction rod.

[0007] As a further solution of the present invention, a gear ring is fixedly connected to one end of the bottom ring of the upper rotating wheel group and the top ring of the lower rotating wheel group, and a reverse gear is installed between the gear rings of the upper rotating wheel group and the lower rotating wheel group, and the reverse gear is meshed with the gear rings on both sides.

[0008] As a further solution of the present invention, a bearing is installed between the center column and the air guide cover, a middle positioning groove and a top positioning groove are opened on the outside of the air guide cover, and open rings are installed in the middle positioning groove and the top positioning groove. The open rings are used to limit the lower rotating wheel group and the upper rotating wheel group respectively, and the air guide cover is conical and has a dome on the top.

[0009] As a further solution of the present invention, the inner sides of the top ring and the bottom ring of the upper impeller group and the lower impeller group are fixedly connected with extension rods, the tail ends of the guide blades are respectively rotatably connected between the extension rods and between the support rods, and the limiting rods are also fixedly connected in groups between the extension rods and between the support rods.

[0010] As a further solution of the present invention, a mounting groove is provided at the top of the guide vane, a rounded slide groove is provided at the bottom of the mounting groove, a slide rod is fixedly connected to the bottom of the control ring, the slide rod is located in the rounded slide groove and the two are slidably matched, the length of the mounting groove is greater than the ring width of the control ring, and the control ring is located below the top ring and at the mounting groove.

[0011] As a further solution of the present invention, a positioning ring is provided above the top ring, and an insertion rod and an inner rod are fixedly connected to the bottom of the positioning ring. The inner rod passes through the control ring and slides with the control ring. A plurality of positioning holes are opened on the top of the top ring, and the insertion rod is plugged into the positioning holes.

[0012] As a further solution of the present invention, a control motor is installed on the top of the top ring, a gear ring is provided on the inner side of the control ring, and the output end of the control motor is meshed with the gear ring of the control ring.

[0013] A method for installing a pump station diversion device comprises the following steps: Install the center column under the water suction pipe through the chassis, and then install the deflector cover; The lower wheel assembly is sleeved outside the air deflector, and the lower wheel assembly is pressed and installed outside the air deflector through an open ring at the middle positioning groove; The upper rotating wheel assembly is sleeved outside the air deflector, and the upper rotating wheel assembly is pressed and installed outside the air deflector through an open ring at the top positioning groove; According to the water inlet direction of the water suction pipe at the water inlet pool, the control ring is rotated, and the front end of the guide blade is pulled by the inserted rod to cause deformation and bending, and the bending degree of the guide blades of the upper impeller group and the lower impeller group is adjusted respectively according to the flow velocity of the surface layer and the bottom layer; Once the installation is complete, it can be put into use.

[0014] As a further embodiment of the present invention,.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention has a simple overall structure, is easy to install, disassemble, and replace, is easy to use, and is located at the inlet of the water inlet pipe, directly changing the inlet flow state, has a more obvious effect, and can be applied to more types of pump stations.

[0016] The guide vanes can deform, bend and adjust the bending direction, and can select the appropriate state according to the flow state, thereby effectively uniforming the flow velocity and flow state, guiding more water flow to the middle part, and avoiding the formation of cyclones in the middle.

[0017] Because of the gear ring and reverse gear provided between the upper and lower wheel assemblies, the upper and lower rotating wheel assemblies can only rotate in opposite directions but not in the same direction. Under the impact of water flow, the upper and lower rotating wheel assemblies can maintain a relatively stable state, and always guide the incoming water flow to a uniform speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial cross-sectional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from a bottom-up perspective; Figure 3 It is a schematic diagram of the rotational cross-sectional structure of the overall structure of the present invention; Figure 4 It is a schematic diagram of the overall structure of the present invention from a top view perspective; Figure 5 It is a schematic diagram of a half-section structure of a rotating wheel assembly in a top-down perspective of the present invention; Figure 6 It is a schematic diagram of the right side bending of the half-section guide blade of the runner assembly in a top-down view of the present invention; Figure 7 It is a schematic diagram of the left side bending of the half-section guide blade of the runner assembly in a top-down view of the present invention; Figure 8 It is a schematic diagram of the structure of the present invention from a front and side perspective; Fig. 9 It is a schematic diagram of the overall structure of the present invention from a side plan view; Fig.10 This is a schematic diagram of the installation position used in the present invention; Fig.11 This is a schematic diagram of the flow state of the water inlet forebay of the present invention; Fig.12 This is a schematic diagram of the enlarged flow state at the water inlet pipe of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Center column; 2. Air deflector; 3. Top ring; 4. Bottom ring; 5. Fixed cylinder; 6. Guide vane; 7. Limit rod; 8. Control ring; 9. Gear ring; 10. Reverse gear; 11. Bearing; 12. Middle positioning groove; 13. Top positioning groove; 14. Open ring; 15. Extension rod; 16. Support rod; 17. Mounting groove; 18. Rounded slide groove; 19. Positioning ring; 20. Insert rod; 21. Inner rod; 22. Positioning hole; 23. Control motor; 24. Slide rod. DETAILED DESCRIPTION

[0020] See also Figure 1-10 The working principle of the technical solution provided by the present invention is as follows: First, install the center column 1 below the pump body suction pipe of the water inlet pool. The center column 1 can be a steel column installed on the bottom of the pool through a chassis, or a column made of other materials. Then put on the deflector 2, and then install the lower wheel group, the middle open ring 14, the upper wheel group and the upper open ring 14 in sequence to complete the basic installation work. Under the gravity of the two wheel groups and the deflector 2, the entire device can be stably installed outside the center column 1. The overall structure of the present invention is simple, easy to install, disassemble, replace, etc., and easy to use; and located at the inlet of the water inlet pipe, it directly changes the inlet flow state, the effect is more obvious, and it can be applied to more types of pumping stations.

[0021] Since the fixing tubes 5 of the upper and lower rotating wheel assemblies are both conical tubes matching the air duct 2 , the fixing tubes 5 of the upper and lower rotating wheel assemblies can be tightly sleeved and fixed outside the air duct 2 under the tightening pressure of the open ring 14 .

[0022] Before use, the bending deformation direction and degree of the guide vane 6 should be adjusted according to the flow state of the entire device. The top positioning ring 19 is pulled up and the insertion rod 20 is pulled up to disengage the positioning hole 22, and then the positioning ring 19 is rotated. The control ring 8 is driven to rotate together with the connection of the inner rod 21. Since the limiting rod 7 blocks the guide vane 6 from tilting and moving, the control ring 8 rotates and then pulls the front end of the guide vane 6 to bend and deform to one side through the sliding rod 24 at its bottom under the restriction of the limiting rod 7. At the same time, the sliding rod 24 slides in the rounded groove 18 and rotates with the control ring 8. The guide vane 6 can be made of thin-walled metal or other deformable materials, so it can adapt to the deformation state and maintain a relatively stable state after deformation.

[0023] Specifically, if the installation location is Fig.11 , Fig.12 At the right side of the middle, the flow pattern of water entering the lower part of the water inlet pipe is biased to the right, so the deflection direction of the guide vane 6 is adjusted to Figure 7 In the direction shown, the flow state of water when entering the lower part of the water inlet pipe is biased to the left, so the deflection direction of the guide vane 6 is adjusted to Figure 6In the direction shown, the guide blade 6 at this time has better water cutting and water gathering capabilities, can greatly reduce the faster flow rate, guide the water flow, and make the flow state entering the lower part of the water inlet pipe tend to be stable; the guide blade 6 can be deformed and bent and adjust the bending direction, and can select a suitable state according to the flow state, so as to effectively even out the flow rate and flow state; Figure 7 Taking the middle deflection direction as an example, when the water flows in from the right direction, the guide blade 6 and the impact of water will make the runner group tend to rotate to the right. Since the upper and lower runner groups receive the same water flow direction, they will have a tendency to rotate to the right. However, due to the gear ring 9 and the reverse gear 10 provided between the upper and lower wheel groups, the upper and lower runner groups can only rotate in opposite directions but not in the same direction, thereby generating resistance through the impact of the water flow. Under the impact of the water flow, the upper and lower runner groups can maintain a relatively stable state, and always guide the incoming water flow to a uniform speed. At the same time, more water flow is guided and gathered to the middle part to avoid cavitation and cyclone generation in the middle part. The flow velocities of the surface layer and the bottom layer are uneven. The use of guide vanes 6 with different areas or different deflection angles in the upper and lower impeller groups can make the upper and lower impeller groups rotate due to uneven forces. When rotating, the rotation directions of the upper and lower impeller groups are inconsistent. If the upper impeller group turns right, the lower impeller group turns left. Under the guidance of the rotation of the guide vanes 6, the flow state of the bottom layer will be immediately changed, making the flow states of the upper and lower layers inconsistent. The upper and lower water flows can be guided to a gentle and uniform state, thereby avoiding the formation of vortices, achieving strong active interference, achieving a uniform flow state, and avoiding the formation of vortices, which is greatly beneficial to the operation of the pump body. The state of the guide blade 6 and the coordination between the gear ring 9 and the reverse gear 10 can make the upper and lower impeller groups have different working states, and can adapt to different working states such as stable, complex or high-intensity. If the flow state at the water inlet pipe is highly uneven and the flow velocity is high, the active interference mode can be selected; if it is relatively stable, a relatively stable state can be selected to continue working.

[0024] If the control loop 8 adopts Fig. 9 If the control motor 23 is driven, the rotation of the control ring 8 can be controlled in real time to change the state of the guide vane 6, thereby realizing the function of follow-up control. It can be adjusted in time according to the flow state and the working condition of the pump body, and has a more timely regulating and guiding effect on the water flow; if a guide pier, a bottom sill or other diversion measures are added to the water inlet front pool, it is necessary to select the state of the guide vane 6 according to the actual situation in order to achieve better results.

[0025] The guide blade 6 is bent by the movement of the control ring 8. A greater force acts on the upper end of the guide blade 6, so the deformation degree is greater. The upper end of the guide blade 6 has a greater displacement, and the lower end of the guide blade 6 has a smaller deformation and displacement. Therefore, the guide blade 6 will show an oblique, tilted and torsional deformation, tending to the shape of a turbine blade, and the upper end has a larger deformation, which helps to guide the upper water flow to the lower layer, thereby playing a role in uniforming the flow velocities of the upper and lower layers, and thus making the water inlet pipe have a more stable flow state.

[0026] The conical flow guide cover 2 has a good vortex elimination effect. The water flow gathered to the middle by the guide blades 6 can enter the water inlet pipe in a stable and concentrated flow state under the guidance of the flow guide cover 2, thereby greatly avoiding cavitation and vibration.

Claims

1. A pump station diversion device, characterized in that: It comprises a central column (1), the central column (1) is provided with a flow guide cover (2) on its outer cover, and the flow guide cover (2) is provided with an upper rotating wheel group and a lower rotating wheel group on its outer cover; The upper impeller group and the lower impeller group have the same structure and rotate in opposite directions, so as to prevent the formation of vortices; The upper rotating wheel assembly and the lower rotating wheel assembly each comprise a top ring (3), a bottom ring (4) and a fixed cylinder (5); the top ring (3) and the bottom ring (4) are both fixedly connected to the fixed cylinder (5) via a support rod (16); a plurality of guide vanes (6) are rotatably mounted between the top ring (3) and the bottom ring (4); a plurality of groups of limiting rods (7) are fixedly connected between the top ring (3) and the bottom ring (4); the limiting rods (7) correspond one to one with the guide vanes (6) and are located on both sides of the middle of the guide vanes (6); The bottom of the top ring (3) is rotatably connected to a control ring (8), and the control ring (8) is rotatably connected to the front end of the guide vane (6). The control ring (8) rotates under the restriction of the restriction rod (7) so that the guide vane (6) is deformed and bent.

2. A pump station diversion device according to claim 1, characterized in that: A gear ring (9) is fixedly connected to the bottom ring (4) of the upper rotating wheel group and the top ring (3) of the lower rotating wheel group at one end close to each other, and a reverse gear (10) is installed between the gear rings (9) of the upper rotating wheel group and the lower rotating wheel group, and the reverse gear (10) is meshed with the gear rings (9) on both sides.

3. A pump station diversion device according to claim 1, characterized in that: A bearing (11) is installed between the central column (1) and the air guide cover (2); a middle positioning groove (12) and a top positioning groove (13) are provided on the outer side of the air guide cover (2); an open ring (14) is installed in the middle positioning groove (12) and the top positioning groove (13); the open ring (14) is used to define a lower rotating wheel group and an upper rotating wheel group, respectively; the air guide cover (2) is conical and has a dome on the top.

4. A pump station diversion device according to claim 1, characterized in that: The inner sides of the top ring (3) and the bottom ring (4) of the upper rotating wheel group and the lower rotating wheel group are fixedly connected with extension rods (15), the tail ends of the guide blades (6) are rotatably connected between the extension rods (15) and between the support rods (16), and the limiting rods (7) are also fixedly connected in groups between the extension rods (15) and between the support rods (16).

5. A pump station diversion device according to claim 1, characterized in that: The guide vane (6) is provided with a mounting groove (17) at the top, and a rounded sliding groove (18) is provided at the bottom of the mounting groove (17). A sliding rod (24) is fixedly connected to the bottom of the control ring (8). The sliding rod (24) is located in the rounded sliding groove (18) and the two are slidably matched. The length of the mounting groove (17) is greater than the ring width of the control ring (8). The control ring (8) is located below the top ring (3) and at the mounting groove (17).

6. A pump station diversion device according to claim 5, characterized in that: A positioning ring (19) is provided above the top ring (3); an insertion rod (20) and an inner rod (21) are fixedly connected to the bottom of the positioning ring (19); the inner rod (21) passes through the control ring (8) and slidably cooperates with the control ring; a plurality of positioning holes (22) are provided at the top of the top ring (3); the insertion rod (20) is plugged into and cooperates with the positioning holes (22).

7. A pump station diversion device according to claim 1, characterized in that: A control motor (23) is mounted on the top of the top ring (3), a gear ring is provided on the inner side of the control ring (8), and the output end of the control motor (23) meshes with the gear ring of the control ring (8).

8. A method for installing a flow diversion device of a pump station, comprising the flow diversion device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Install the central column (1) below the water suction pipe through the chassis, and then install the deflector cover (2); S2: The lower wheel assembly is sleeved outside the air guide cover (2), and the lower wheel assembly is pressed and installed outside the air guide cover (2) through an open ring (14) at the middle positioning groove (12); S3: The upper rotating wheel assembly is sleeved outside the air guide cover (2), and the upper rotating wheel assembly is pressed and installed outside the air guide cover (2) through the opening ring (14) at the top positioning groove (13); S4: according to the water inflow direction of the water suction pipe at the water inlet pool, the control ring (8) is rotated, and the front end of the guide blade (6) is pulled by the insertion rod (20) to cause deformation and bending, and the bending degrees of the guide blades (6) of the upper impeller group and the lower impeller group are adjusted according to the flow velocity of the surface layer and the bottom layer; S5: Once the installation is complete, it can be put into use.

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