Vertical two-way mixed-flow pump flow guide device

Abstract

The invention relates to the technical field of mixed-flow pumps, and particularly discloses a vertical two-way mixed-flow pump flow guide device which comprises a mixed-flow pump body, a water outlet flow guide device is arranged above the mixed-flow pump body, a water inlet flow guide device is arranged below the mixed-flow pump body, and the water inlet flow guide device comprises a flow guide cone. A cover plate is arranged on the upper side of the flow guide cone, a plurality of reserved holes are evenly formed in the circumferential side of the flow guide cone, and a water inlet horn corresponding to the water inlet flow guide device is arranged on the lower portion of the mixed-flow pump body. Water flow is optimized through the box culvert type water inlet flow channel and the water inlet flow guiding device, it is ensured that the two-way water inlet flow state is uniform and smooth, bad flow states are reduced, the operation stability of the mixed-flow pump is improved, kinetic energy loss is reduced through the two-way elbow water outlet flow guiding device, a diffusion pipe is prolonged, the water outlet effect and efficiency are improved, meanwhile turbulent flow and vibration are avoided, and the flow guiding device is simple in structure and low in cost. The construction difficulty is low, installation and maintenance are convenient, and the overall construction and production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mixed flow pumps, and in particular to a vertical bidirectional mixed flow pump guide device. Background Art

[0002] A mixed flow pump is a fluid machine between a centrifugal pump and an axial flow pump. It combines the working principles of these two pumps and is suitable for situations that require higher flow and lower head. The fluid flow direction of the mixed flow pump is between the axial and radial directions. The fluid is affected by both centrifugal force and axial force, so its flow direction presents a certain angle. The mixed flow pump is suitable for large flow and low head delivery tasks, such as water treatment, farmland irrigation, urban drainage, ships and some industrial water delivery.

[0003] At present, mixed flow pumps are generally equipped with water inlet and outlet diversion structures when in use. The diversion structure can optimize the entry and outflow of water flow, reduce energy loss, improve efficiency, and reduce equipment wear and vibration. However, the design of the water inlet flow channel of the existing mixed flow pump diversion device has the problem of uneven water flow contraction and uneven flow, resulting in poor water inlet flow state, easy to produce vortex and bad flow state, thus affecting the safe and stable operation of the pump, and the water outlet diversion device fails to effectively control the direction of the water flow, resulting in unstable water outlet flow state, low efficiency of kinetic energy conversion into pressure energy, resulting in large kinetic energy loss, and the shape of the water inlet flow channel used in the existing mixed flow pump is relatively complex, such as elbow-shaped water inlet flow channel or dustpan-shaped water inlet flow channel, which requires relatively complex concrete formwork and installation process during construction, and the complex structure will also increase the difficulty of production and processing. Therefore, the present invention proposes a vertical bidirectional mixed flow pump diversion device to solve the problems mentioned in the above background technology. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a vertical bidirectional mixed flow pump guide device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A vertical bidirectional mixed flow pump guide device comprises a mixed flow pump body, a water outlet guide device is arranged above the mixed flow pump body, and a water inlet guide device is arranged below the mixed flow pump body;

[0007] The water inlet diversion device comprises a diversion cone, a cover plate is arranged on the upper side of the diversion cone, and a plurality of reserved holes are evenly opened around the diversion cone, a water inlet horn corresponding to the water inlet diversion device is arranged at the lower part of the mixed flow pump body, the interior of the diversion cone is a hollow cavity, and an opening corresponding to the cavity is opened at the top of the diversion cone, and the opening and the plurality of reserved holes around the diversion cone are used for pouring concrete into the cavity of the diversion cone;

[0008] The water outlet diversion device comprises a diversion water outlet body, and water outlets are provided on the left and right sides of the upper side of the diversion water outlet body.

[0009] Preferably, an embedded steel plate is welded below the water inlet diversion device, anchoring steel bars are welded to the lower part of the embedded steel plate, and the diversion cone is welded and fixed to the upper cover plate, the embedded steel plate and the anchoring steel bars are welded on site, and a casting groove preset for embedding the anchoring steel bars is poured, and then the diversion cone is welded to the embedded steel plate, and concrete is poured into the diversion cone through the top opening and the reserved holes.

[0010] Preferably, the guide cone is in the shape of a symmetrical annular volcano, and the upper cover plate of the guide cone is in the shape of a hemisphere. Viewed from the side, the slope of the lower third of the guide cone is gentle, the slope of the upper two-thirds of the guide cone is steeper, and the upper and lower parts of the guide cone are seamlessly and smoothly connected by an arc.

[0011] Preferably, the guide cone is made of stainless steel module groups that are precision welded in sections, the cover plate is made of stainless steel integral die-casting, the gap between the guide cone and the upper water inlet horn is the water inlet, the opening angle of the water inlet horn is between 10° and 15°, stainless steel has high corrosion resistance, and the guide cone and the cover plate surface are provided with an anti-corrosion coating to extend the service life. The guide cone welded in sections has lower processing difficulty, which is conducive to high-efficiency production, and precision welding ensures the smoothness of the welding parts.

[0012] Preferably, the side of the diverted water body is in the shape of the letter "Y", and the two water outlets correspond to the two ends of the letter "Y" respectively. The inner diameter of the water outlet is less than or equal to the inner diameter of the inlet end of the diverted water body to reduce the acceleration effect of the water flow and avoid uneven flow.

[0013] Preferably, the diversion water body is made of stainless steel module groups that are precisely welded in sections, and the curved pipe part of the diversion water body is manufactured using a cold bending process. The radius of the curved pipe part is twice the diameter of the straight pipe of the diversion water body. Too small a bending radius may cause unnecessary pressure loss and turbulence in the water flow.

[0014] Preferably, the embedded steel plate is 6-10 mm thick and is cast from low alloy steel. The anchoring steel bars are made of high strength steel bars. Low alloy steel ensures good welding performance and bearing capacity. The diameter and arrangement of the anchoring steel bars are designed based on the load requirements and the stability requirements of the pump body.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention adopts a box culvert type water inlet channel in combination with a water inlet guide device, which is more reasonable. The two-way water inlet is achieved by controlling the gate. The water inlet guide device is arranged under the water inlet horn to ensure that the water flow in the water inlet channel shrinks evenly and flows smoothly. The water inlet flow pattern is further optimized, reducing the generation of vortices and other undesirable flow patterns in the water inlet channel, and providing a more ideal flow pattern for the safe and stable operation of the two-way water inlet and outlet mixed flow pump;

[0017] 2. The bidirectional elbow water outlet diversion device of the present invention can effectively ensure the stability of the water outlet flow state, effectively reduce the kinetic energy loss of the water outlet, thereby improving the efficiency of the device, and at the same time ensure the stability of the water outlet flow state. While meeting the symmetry requirements, the length of the water outlet diffusion pipe is increased, which is beneficial to the conversion of kinetic energy into pressure energy, reduces kinetic energy loss, has a good water outlet effect, and improves the efficiency of the device. The height from the water outlet elbow to the bottom of the water outlet flow channel is relatively high, which can avoid the generation of turbulence and the occurrence of harmful vibrations;

[0018] 3. The bidirectional water inlet and outlet mixed flow pump adopted by the present invention has simple water inlet and outlet flow channel profiles and water pump structure, low construction difficulty, and convenient installation and maintenance of the water pump unit. The box culvert type water inlet flow channel is simpler in shape than the elbow-shaped water inlet flow channel or the dustpan-shaped water inlet flow channel, the concrete formwork is relatively simple, the construction difficulty is low, and the construction cost is also low. The shape of the concrete part of the water outlet flow channel is simpler and easy to produce and process.

[0019] In summary, the present invention optimizes the water flow through the box culvert type water inlet channel and the water inlet diversion device, ensures that the two-way water inlet flow is uniform and smooth, reduces undesirable flow states, and improves the operating stability of the mixed flow pump. The two-way curved pipe water outlet diversion device reduces kinetic energy loss, extends the diffuser, and improves the water outlet effect and efficiency while avoiding turbulence and vibration. The diversion device has a simple structure, low construction difficulty, and is easy to install and maintain, thereby reducing the construction and production costs as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the assembly structure of a vertical bidirectional mixed flow pump guide device proposed by the present invention;

[0021] Figure 2 It is a structural schematic diagram of a water inlet flow guiding device in a vertical bidirectional mixed flow pump flow guiding device proposed by the present invention;

[0022] Figure 3 The present invention provides a schematic structural diagram of a water outlet diversion device in a vertical bidirectional mixed flow pump diversion device.

[0023] In the figure: 1. Mixed flow pump body;

[0024] 2. water inlet diversion device; 201. diversion cone; 202. cover plate; 203. reserved hole;

[0025] 3. water outlet diversion device; 301. diversion water body; 302. water outlet;

[0026] 4. Embedded steel plate; 5. Anchor steel bars; 6. Water inlet horn. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Reference Figure 1-3 , a vertical bidirectional mixed flow pump guide device, comprising a mixed flow pump body 1, a water outlet guide device 3 is arranged above the mixed flow pump body 1, and a water inlet guide device 2 is arranged below the mixed flow pump body 1, and bidirectional water inlet is realized by controlling the gate, and the water inlet guide device ensures that the water flow in the water inlet channel shrinks evenly and flows smoothly, and the water inlet flow state is further optimized, reducing the generation of vortices and other undesirable flow states in the water inlet channel, and can provide a more ideal flow state for the safe and stable operation of the bidirectional inlet and outlet mixed flow pumps. The bidirectional elbow water outlet guide device can effectively ensure the stability of the water outlet flow state, effectively reduce the loss of water outlet kinetic energy, thereby improving the efficiency of the device, and at the same time ensure the stability of the water outlet flow state, while adapting to the symmetry requirements, increasing the length of the water outlet diffuser, which is beneficial to the conversion of kinetic energy into pressure energy, reducing kinetic energy loss, and having a good water outlet effect, improving the efficiency of the device, and the height from the water outlet elbow to the bottom of the water outlet channel is relatively high, which can avoid the generation of turbulence and the occurrence of harmful vibrations;

[0029] Furthermore, the water inlet diversion device 2 includes a diversion cone 201, a cover plate 202 is provided on the upper side of the diversion cone 201, and a plurality of reserved holes 203 are evenly provided around the diversion cone 201, a water inlet horn 6 corresponding to the water inlet diversion device 2 is provided at the lower part of the mixed flow pump body 1, the interior of the diversion cone 201 is a hollow cavity, and an opening corresponding to the cavity is provided at the top of the diversion cone 201, and the opening and the plurality of reserved holes 203 on the peripheral side are used to pour concrete into the cavity of the diversion cone 201, an embedded steel plate 4 is welded below the water inlet diversion device 2, an anchor steel bar 5 is welded at the lower part of the embedded steel plate 4, and the diversion cone 201 is welded and fixed to the upper cover plate 202, the embedded steel plate 4 is welded to the anchor steel bar 5 on site, and a casting trough for embedding the anchor steel bar 5 preset in advance is poured, and then the diversion cone 201 is welded to the embedded steel plate 4;

[0030] Furthermore, concrete is poured into the guide cone 201 through the top opening and the reserved hole 203. The embedded steel plate 4 is 6-10 mm thick and is cast with low alloy steel. This selection has good welding performance and high bearing capacity, and can effectively support the installation and stability of the water inlet guide device. The anchor steel bar 5 is made of high-strength steel bars. Low alloy steel ensures good welding performance and bearing capacity. The diameter and arrangement of the anchor steel bar 5 are designed according to the load requirements and the stability requirements of the pump body. Concrete is poured into the cavity. The pouring of concrete enhances the strength of the structure, and the gravity of the concrete can be used to further improve the fluid stability.

[0031] Furthermore, the guide cone 201 is in the shape of a volcano with a symmetrical ring, and the cover plate 202 at the upper end of the guide cone 201 is in the shape of a hemisphere. When viewed from the side, the slope of the lower third of the guide cone 201 is gentle, and the slope of the upper two-thirds of the guide cone 201 is steep. The upper and lower parts of the guide cone 201 are seamlessly connected in a smooth arc, ensuring that the water flow is properly guided before entering the pump body, reducing turbulence and ensuring the stability of the fluid. The guide cone 201 is made of stainless steel module groups and is precisely welded in sections. The cover plate 202 is made of stainless steel integral die-casting. The hemispherical cover plate 202 is used to smoothly transition the water flow direction and reduce the turbulence of the water flow in the flow. The pressure loss generated when entering the pump body, the gap between the guide cone 201 and the upper water inlet horn 6 is the water inlet, the opening angle of the water inlet horn 6 is between 10° and 15°, this angle is conducive to the uniform distribution of the fluid, reduces the vortex phenomenon of the water flow, and improves the efficiency of the pump. The horn-shaped opening also effectively reduces the shear effect of the fluid and reduces the local loss of the pump body. Stainless steel has high corrosion resistance, and the surfaces of the guide cone 201 and the cover plate 202 are provided with an anti-corrosion coating to extend the service life. The guide cone 201 welded in sections is easier to process, which is conducive to high-efficiency production, and precision welding ensures smooth welding parts.

[0032] Furthermore, the water outlet diversion device 3 includes a diversion water body 301, and water outlets 302 are opened on the left and right sides of the upper side of the diversion water body 301. The side of the diversion water body 301 is in the shape of the letter "Y", and the two water outlets 302 correspond to the two ends of the letter "Y" respectively. The inner diameter of the water outlet 302 is less than or equal to the inner diameter of the inlet end of the diversion water body 301 to reduce the acceleration effect of the water flow and avoid uneven flow. The diversion water body 301 is made of stainless steel module groups that are precisely welded in sections. The curved pipe part of the diversion water body 301 is manufactured by cold bending technology. The radius of the curved pipe part is twice the diameter of the straight pipe of the diversion water body 301. Too small bending radius may cause unnecessary pressure loss and turbulence in the water flow. The pipe manufactured by cold bending technology can ensure the accuracy and shape stability of the pipe, which helps to reduce the risk of leakage or uneven flow at the pipe connection.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vertical bidirectional mixed flow pump diversion device, comprising a mixed flow pump body (1), characterized in that: A water outlet guide device (3) is provided above the mixed flow pump body (1), and a water inlet guide device (2) is provided below the mixed flow pump body (1); The water inlet guide device (2) comprises a guide cone (201), a cover plate (202) is arranged on the upper side of the guide cone (201), and a plurality of reserved holes (203) are evenly arranged around the guide cone (201), a water inlet horn (6) corresponding to the water inlet guide device (2) is arranged at the lower part of the mixed flow pump body (1), the interior of the guide cone (201) is a hollow cavity, and an opening corresponding to the cavity is arranged at the top of the guide cone (201), and the opening and the plurality of reserved holes (203) on the circumference are used for pouring concrete into the cavity of the guide cone (201); The water outlet diversion device (3) comprises a diversion outlet water body (301), and water outlets (302) are provided on the upper and left sides of the diversion outlet water body (301).

2. The vertical bidirectional mixed flow pump guide device according to claim 1, characterized in that: An embedded steel plate (4) is welded below the water inlet guide device (2), an anchoring steel bar (5) is welded below the embedded steel plate (4), and the guide cone (201) is fixedly welded to the upper cover plate (202).

3. The vertical bidirectional mixed flow pump guide device according to claim 1, characterized in that: The guide cone (201) is in the shape of a symmetrical annular volcano, and the cover plate (202) at the upper end of the guide cone (201) is in the shape of a hemisphere.

4. The vertical bidirectional mixed flow pump guide device according to claim 1, characterized in that: The guide cone (201) is formed by precision welding of stainless steel module groups in sections, the cover plate (202) is formed by integral stainless steel die-casting, the gap between the guide cone (201) and the upper water inlet horn (6) is the water inlet, and the opening angle of the water inlet horn (6) is between 10° and 15°.

5. The vertical bidirectional mixed flow pump flow guiding device according to claim 1, characterized in that: The side surface of the diverted water body (301) is in the shape of the letter "Y", and the two water outlets (302) correspond to the two ends of the letter "Y" respectively. The inner diameter of the water outlet (302) is less than or equal to the inner diameter of the inlet end of the diverted water body (301).

6. The vertical bidirectional mixed flow pump flow guiding device according to claim 1, characterized in that: The diversion water body (301) is made of stainless steel module groups that are segmented and precisely welded. The curved pipe portion of the diversion water body (301) is manufactured using a cold bending process, and the radius of the curved pipe portion is twice the diameter of the straight pipe of the diversion water body (301).

7. The vertical bidirectional mixed flow pump flow guiding device according to claim 1, characterized in that: The embedded steel plate (4) has a thickness of 6-10 mm, and the embedded steel plate (4) is cast with low alloy steel, and the anchoring steel bar (5) is made of high-strength steel bar.

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