Prefabricated pump station

Abstract

The large-flow prefabricated pump station comprises a cylinder bottom, a cylinder body with a liquid inlet, a partition plate and a rectifying device, and a submersible pump unit is installed at the cylinder bottom. The two sides of the partition plate are fixed to the barrel, the top end of the partition plate is not lower than the lower edge of the liquid inlet, and the partition plate divides the inner space of the barrel into a pump cavity and a water gushing cavity. The rectifying device is arranged in the water gushing cavity. The rectifying device comprises an upper guide plate, the upper guide plate is fixed to the upper portion of the partition plate and located below the liquid inlet, and a first circulation opening allowing fluid to pass through is formed between the side, away from the center line of the barrel, of the upper guide plate and the barrel. The influence of non-uniform flow state of fluid at the liquid inlet on the operation of the submersible pump can be effectively avoided or reduced, a good water inlet condition is created for the submersible pump, and the submersible pump can adapt to a high-flow working condition without parallel connection of multiple cylinders.

Description

Technical Field

[0001] The present invention generally relates to a pump station for conveying liquids, and more particularly, to a prefabricated pump station. Background Art

[0002] Traditional large-flow pump stations usually adopt two solutions: one is to use axial flow pump stations, but axial flow pumps generally have low head and are not suitable for pumping media with high solid content; the other is to use concrete pump stations, but concrete pump stations are not only expensive and occupy a large area, but also have a long construction period.

[0003] The existing integrated prefabricated pump station has a small volume and a small flow rate per unit time. The flow rate of a single cylinder is generally within 1m 3 / s or less. Under high flow conditions, the current solution is to use multiple cylinders in parallel, which not only increases the project construction cost, but also multiplies the floor space of the pump station. Summary of the invention

[0004] One object of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a prefabricated pump station with a large single-cylinder flow rate.

[0005] Another object of the present invention is to provide a prefabricated pump station with good energy dissipation function, so that the flow of the fluid entering the suction port of the submersible pump is uniform, preventing the generation of vortices and the introduction of air, creating good water inlet conditions for the submersible pump, and improving the stability of the submersible pump operation.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] The prefabricated pump station disclosed in the present invention comprises a cylinder bottom and a cylinder body arranged on the cylinder bottom, a partition and a rectifying device, a liquid inlet is arranged on the cylinder body, and a submersible pump unit is installed on the cylinder bottom. The partition has two opposite sides and opposite top and bottom ends, the top end of the partition is not lower than the lower edge of the liquid inlet, the bottom end is higher than the upper surface of the cylinder bottom, and the two sides are fixed to the cylinder body respectively, and the partition divides the internal space of the cylinder body into a pump chamber away from the liquid inlet and a water gushing chamber close to the liquid inlet. The submersible pump unit is installed in the pump chamber, and the rectifying device is arranged in the water gushing chamber. The rectifying device comprises an upper guide plate, which is fixed to the upper part of the partition plate and is located below the liquid inlet, and a first flow port for fluid to pass through is formed between the end of the upper guide plate away from the center line of the cylinder and the cylinder.

[0008] According to one embodiment of the present invention, the top end of the partition is located between the center line of the liquid inlet and the upper edge of the liquid inlet.

[0009] According to one embodiment of the present invention, the upper guide plate has opposite upper and lower ends and opposite two sides, the upper end is fixed to the partition, the two sides of the upper guide plate are fixed to the cylinder, and the first flow port is formed between the lower end and the cylinder.

[0010] According to one embodiment of the present invention, the distance between the upper end and the lower end of the upper guide plate is 0.1D-0.3D.

[0011] According to one embodiment of the present invention, the angle between the upper guide plate and the partition plate is 30°-90°.

[0012] According to one embodiment of the present invention, the rectifying device also includes a lower guide plate, which is fixed to the bottom end of the partition and is higher than the upper surface of the bottom of the cylinder. A second flow port for fluid to pass through is formed between the side of the lower guide plate away from the center line of the cylinder and the cylinder.

[0013] According to one embodiment of the present invention, the lower guide plate has opposite upper and lower ends and opposite two sides, the upper end is fixed to the partition, the two sides of the upper guide plate are fixed to the cylinder, and the second flow port is formed between the lower end and the cylinder.

[0014] According to one embodiment of the present invention, the distance between the upper end and the lower end of the lower guide plate is 0.1D-0.3D.

[0015] According to an embodiment of the present invention, the lower guide plate is inclined toward the bottom of the cylinder along a direction away from the center line of the cylinder, and an angle between the lower guide plate and the partition is 45°-85°.

[0016] According to one embodiment of the present invention, the rectifying device further comprises a baffle fixed to the partition and / or the cylinder, the baffle being located below the upper guide plate, a flow passage being provided on the baffle, and the flow passage being close to the partition.

[0017] According to an embodiment of the present invention, the baffle is close to the lower end of the partition.

[0018] According to an embodiment of the present invention, the baffle has an arc-shaped edge and a straight edge connecting two ends of the arc-shaped edge, and the arc-shaped edge is fixed to the cylinder.

[0019] According to an embodiment of the present invention, a protrusion extends outward from the middle of the straight edge of the baffle, the protrusion is fixedly connected to the partition, and the gap between the straight edges on both sides of the protrusion and the partition forms the flow channel.

[0020] According to one embodiment of the present invention, the gap is 100-300 mm.

[0021] According to one embodiment of the present invention, the rectifying device further comprises a baffle fixed to the partition and / or the cylinder, a flow passage is provided on the baffle, and the baffle is located above the lower guide plate, and the distance between the two is 100-300 mm.

[0022] According to one embodiment of the present invention, the diameter of the cylinder is greater than or equal to 3.8 m; and / or the distance between the center line of the liquid inlet and the lower surface of the cylinder bottom is 1D-3D, where D is the diameter of the cylinder.

[0023] According to an embodiment of the present invention, the partition is parallel to the center line of the cylinder, and the distance between the partition and the center line of the cylinder is 0.2D-0.3D; the height of the partition is 0.4D-0.6D.

[0024] According to one embodiment of the present invention, the cylinder bottom includes a cylindrical cylinder bottom side wall and a first step and a second step which are arranged in the cylinder bottom side wall and are relatively arranged, the space between the first step and the second step is a suction pit, the submersible pump unit is installed on the second step, includes at least one submersible pump, and the suction port of the submersible pump is located in the suction pit.

[0025] According to one embodiment of the present invention, the first step is located below the water gushing chamber, and includes a first step top wall and a first step side wall which are interconnected at one end, the other end of the first step top wall is fixed to the cylinder bottom side wall, and the other end of the first step side wall is fixed to the bottom of the cylinder.

[0026] According to one embodiment of the present invention, the top wall of the first step includes a horizontal wall portion and an inclined wall portion which are interconnected at one end, the other end of the horizontal wall portion is fixed to the bottom side wall of the cylinder, and the other end of the inclined wall portion is fixed to the first step side wall), and the inclined wall portion is inclined upward from the horizontal wall portion to the first step side wall, forming an obtuse angle between the two, and the obtuse angle is 160°-178°.

[0027] It can be seen from the above technical solution that the advantages and positive effects of the present invention are:

[0028] The prefabricated pump station of the present invention is provided with a partition and a rectifying device. The partition divides the internal space of the cylinder into a relatively independent pump chamber and a water gushing chamber. The pump chamber is far away from the liquid inlet, and the water pump unit is installed in the pump chamber; the water gushing chamber is close to the liquid inlet, and the rectifying device is arranged in the water gushing chamber. The rectifying device includes an upper guide plate fixed to the partition, and a first flow port is arranged between the upper guide plate and the cylinder. The fluid flowing into the cylinder from the liquid inlet enters the water gushing chamber, and the fluid entering the water gushing chamber first hits the partition, consuming part of the energy; then it is guided to the cylinder by the upper guide plate, and in the process of the collision between the fluid and the cylinder, part of the energy is consumed again; then the fluid passes through the first flow port, and part of the fluid flows to the partition again, hits the partition, and consumes part of the energy again. The fluid in the water gushing chamber changes its flow direction many times like a surge and hits the cylinder and the partition, effectively dissipating the energy therein, so that the flow state of the fluid flowing into the suction pit is uniform. Therefore, the prefabricated pump station of the present invention can greatly increase the flow rate of a single cylinder while ensuring the normal operation of the submersible pump.

[0029] At the same time, the fluid entering the water gushing chamber is rectified by a rectifier device such as an upper guide plate, which extends the flow path. It can not only further dissipate the energy therein and improve the uniformity of the flow state of the fluid flowing into the suction pit; it is also beneficial to disperse the gas mixed in the fluid and reduce the gas entering the suction port, thereby helping to reduce cavitation, vibration and noise of the submersible pump.

[0030] Under the action of the water gushing chamber and the rectifying device, the present invention can effectively avoid or reduce the influence on the operation of the submersible pump caused by the uneven flow state of the fluid at the liquid inlet, and can create good water inlet conditions for the submersible pump. Therefore, it is not necessary to connect multiple cylinders in parallel to adapt to the working conditions of large flow.

[0031] The above and other objects, features and advantages of the present invention will become more apparent from the following description of preferred embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the three-dimensional exploded structure of the prefabricated pump station of the present invention;

[0033] Figure 2 It is a schematic diagram of the three-dimensional exploded structure of the prefabricated pump station of the present invention observed from another angle, wherein the cylinder is not shown;

[0034] Figure 3 is a cross-sectional schematic diagram of the prefabricated pump station of the present invention;

[0035] Figure 4 yes Figure 3 Sectional view along the AA plane;

[0036] Figure 5 yes Figure 3 Sectional view along plane BB;

[0037] Figure 6 yes Figure 3 An enlarged view of the lower portion of the prefabricated pump station is shown;

[0038] 7A and Figure 7B They are respectively simulation diagrams of the fluid flow patterns in the bottom area of ​​the prefabricated pump station of the comparative example and the present invention;

[0039] 8A and Figure 8B They are respectively simulation diagrams of gas distribution in the liquid suction pit of the prefabricated pump station of the comparative example and the present invention;

[0040] 9A and Fig. 9B They are respectively simulation diagrams of the flow field distribution inside the suction pit of the prefabricated pump station and the gas volume fraction distribution of the comparative example and the present invention;

[0041] 10A and Fig. 10B They are respectively simulation diagrams of gas precipitation during fluid flow in the prefabricated pump station of the comparative example and the present invention;

[0042] 11A and Fig. 11B They are respectively simulation diagrams of energy consumption during fluid flow of the prefabricated pump station of the comparative example and the present invention;

[0043] Fig.12 It is a schematic diagram of the pre-swirl angle of the water pump inflow of the prefabricated pump station of the comparative example and the present invention;

[0044] Fig.13 It is a schematic diagram of the offset of the average axial velocity of the suction port of the prefabricated pump station of the comparative example and the present invention. DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described here are only for illustration and are not intended to limit the present invention.

[0046] like Figure 1 , Figure 2 and Figure 3 As shown, the prefabricated pump station of the present invention includes a cylinder bottom 1, a cylinder body 2, a submersible pump unit, a partition 5 and a rectifier. The submersible pump unit includes one or more submersible pumps 3, and three submersible pumps 3 are shown in the figure. In some other embodiments, the number of submersible pumps 3 is not limited to 3, and can be appropriately increased or decreased according to actual applications.

[0047] In the prefabricated pump station of the present invention, the cylinder bottom 1 and the cylinder body 2 can be an integral structure formed in one piece, or a split structure connected together. When the two are split structures, the submersible pump unit can be installed on the cylinder bottom 1 first, and then the cylinder body 2 can be installed on the cylinder bottom 1, which is more convenient to install.

[0048] like Figure 3As shown, the cylinder bottom 1 can be made of a plate, such as a glass fiber reinforced plastic plate or a metal plate. The cylinder body 2 is provided with a liquid inlet 21, and the external fluid enters the pump station through the liquid inlet 21. The distance P between the center line M of the liquid inlet 21 and the lower surface of the cylinder bottom 1 can be 1D-3D, where D is the diameter of the cylinder body 2.

[0049] like Figure 6 As shown, the cylinder bottom 1 comprises a cylinder bottom side wall 10, a first step 11 and a second step 14. The first step 11 and the second step 14 are arranged opposite to each other, and a liquid suction pit 12 is formed in the space between the first step 11 and the second step 14.

[0050] The cylinder bottom side wall 10 is in a cylinder shape, for example, a cylindrical shape. The bottom ends of the cylinder bottom side wall 10 are on the same plane.

[0051] The first step 11 includes a first step top wall 111 and a first step side wall 112 which are interconnected or integrally formed at one end; the other end of the first step top wall 111 is connected to the bottom side wall 10 of the cylinder by welding or integrally forming, and the other end of the first step side wall 112 is connected to the bottom of the cylinder 2 by welding or integrally forming.

[0052] In one embodiment, the first step top wall 111 includes a horizontal wall portion 1111 and an inclined wall portion 1112 connected to each other at one end, the other end of the horizontal wall portion 1111 is fixed to the cylinder bottom side wall 10, and the other end of the inclined wall portion 1112 is fixed to the first step side wall 112, and the inclined wall portion 1112 is inclined upward from the horizontal wall portion 1111 to the first step side wall 112, so that the inclined wall portion 1112 forms an obtuse angle γ with the horizontal wall portion 1111, and the obtuse angle γ can be 160°-178°. The inclined wall portion 1112 can be a flat plate, or an arc plate, etc.

[0053] The second step 14 includes a second step top wall 141 and a second step side wall 142 which are mutually connected or integrally formed at one end; the other end of the second step top wall 141 is connected to the top end of the cylinder bottom side wall 10 by welding or integrally forming, and the other end of the second step side wall 142 is connected to the bottom of the cylinder bottom 2 by welding or integrally forming.

[0054] The three submersible pumps 3 are installed on the second step top wall 141 of the second step 14 , and the liquid suction ports of the submersible pumps 3 are located in the liquid suction pit 12 .

[0055] like Figure 1 and Figure 3As shown, the partition 5 in the prefabricated pump station of the present invention is arranged in the cylinder 2, and the partition 5 has two opposite sides and opposite top and bottom ends. The two sides of the partition 5 are respectively fixed to the cylinder 2, and the partition 5 can be parallel to the center line X of the cylinder 2. The distance E between the partition 5 and the center line X of the cylinder 2 can be between 0.2D and 0.3D. The partition 5 divides the internal space of the cylinder 2 into a pump chamber 300 and a water gushing chamber 200, wherein the pump chamber 300 is far away from the liquid inlet 21, and the submersible pump unit is installed in the pump chamber 300; the water gushing chamber 200 is close to the liquid inlet 21, and the rectifying device is arranged in the water gushing chamber 200. The rectifying device prolongs the path of the fluid flowing into the cylinder 2 from the liquid inlet 21 and reduces the fluid energy.

[0056] The top of the partition 5 is not lower than the lower edge 211 of the liquid inlet 21, so that the fluid can enter the water gushing chamber 200; the top of the partition 5 is not higher than the upper edge 212 of the liquid inlet 21, so that under the condition of extremely large flow, a part of the fluid can pass over the top of the partition 5 and directly enter the pump chamber 300 to prevent the fluid from being blocked by the partition 5. In one embodiment, the top of the partition 5 can be slightly higher than the center line M of the liquid inlet 21. The bottom end of the partition 5 is higher than the upper surface of the bottom 1 of the cylinder, that is, higher than the upper surface of the top wall 111 of the first step. Further, the bottom end of the partition 5 can be slightly higher than the top of the submersible pump 3. The height H of the partition 5 can be in the range of 0.4D-0.6D.

[0057] like Figures 1 to 5 As shown, the rectifying device in the present invention comprises an upper guide plate 6, a lower guide plate 7 and a baffle 8.

[0058] like Figure 3 As shown, the upper guide plate 6 is fixed to the upper part of the partition plate 5 and is located below the liquid inlet 21. A first flow opening 60 for fluid to pass through is formed between the side of the upper guide plate 6 away from the center line of the cylinder 2 and the cylinder 2. The upper guide plate 6 is inclined toward the cylinder bottom 1 along the direction away from the center line X of the cylinder 2. The angle α between the upper guide plate 6 and the partition plate 5 is 45°, and the angle α is feasible in the range of 30°-90°.

[0059] like Figure 3 and Figure 4 As shown, the upper guide plate 6 has an upper end and a lower end opposite to each other, and two opposite sides respectively connected to the upper end and the lower end, the upper end is fixed to the partition plate 5, the two sides of the upper guide plate 6 are fixed to the cylinder 2, and the first flow opening 60 is formed between the lower end and the cylinder 2. The distance between the upper end and the lower end of the upper guide plate 6 is 0.1D-0.3D. The lower end of the upper guide plate 6 can be straight, wavy or sawtooth.

[0060] like Figures 1 to 3As shown, the lower guide plate 7 is fixed to the bottom end of the partition plate 5 and is higher than the upper surface of the cylinder bottom 1. A second flow opening 70 for fluid to pass through is formed between the side of the lower guide plate 7 away from the center line X of the cylinder 2 and the cylinder 2. The flow area of ​​the second flow opening 70 can be smaller than that of the first flow opening 60.

[0061] like Figure 3 As shown, the lower guide plate 7 is inclined toward the cylinder bottom 1 along the direction X away from the center line of the cylinder 2, and the angle β between the lower guide plate 7 and the partition plate 5 is 60°, and the angle β is feasible in the range of 45°-85°.

[0062] like Figure 2 As shown, the lower guide plate 7 has an upper end and a lower end opposite to each other and two opposite sides, the upper end is fixed to the partition plate 5, the two sides of the upper guide plate 6 are fixed to the cylinder 2, and the second flow opening 70 is formed between the lower end and the cylinder 2. The distance between the upper end and the lower end of the lower guide plate 7 is 0.1D-0.3D. The lower end of the lower guide plate 7 can be straight, wavy or sawtooth.

[0063] In this embodiment, the structure of the lower guide plate 7 is the same as that of the upper guide plate 6. In some other embodiments, the structure of the lower guide plate 7 and the upper guide plate 6 may also be different.

[0064] like Figure 2 As shown, the baffle 8 is located between the upper guide plate 6 and the lower guide plate 7. In this embodiment, the baffle 8 is located close to the lower guide plate 7, and the distance S between the baffle 8 and the lower guide plate 7 can be in the range of 100-300 mm. The angle θ between the baffle 8 and the partition 5 can be 90°, that is, the baffle 8 is perpendicular to the partition 5.

[0065] like Figure 5 As shown, the baffle 8 has an arcuate edge and a straight edge connecting the two ends of the arcuate edge, a protrusion 81 extends outward from the middle of the straight edge of the baffle 8, the protrusion 81 is fixedly connected to the partition 5, and the arcuate edge is fixed to the cylinder 2. The gap between the straight edges on both sides of the protrusion 81 of the baffle 8 and the partition 5 forms a flow passage 80, and the gap can be in the range of 100-300mm. The position of the flow passage 80 on the baffle 8 is not limited to this, and it is feasible to be close to the partition 5.

[0066] In this embodiment, the baffle 8 is fixed to both the partition 5 and the cylinder 2 . In other embodiments, the baffle 8 may be fixed only to the partition 5 , or only to the cylinder 2 .

[0067] The above-mentioned rectifying device includes the upper guide plate 6, the lower guide plate 7 and the baffle plate 8. In some other embodiments, the rectifying device may include only one of the upper guide plate 6, the lower guide plate 7 and the baffle plate 8, or any combination of any two of them.

[0068] The fluid flowing into the barrel 2 from the liquid inlet 21 does not directly enter the pump chamber 300 , but enters the water gushing chamber 200 . The fluid first hits the baffle 5, consuming part of its energy; then it is guided by the upper guide plate 6 to the wall of the cylinder 2, and in the process of the fluid colliding with the cylinder wall, part of its energy is consumed again; then part of the fluid flows along the cylinder wall to the baffle 8, and another part of the fluid flows to the baffle 5 again, collides with the baffle 5, and consumes part of its energy again, falls along the baffle to the baffle 8 or drips onto the baffle 8; when the fluid hits the baffle 8, part of its energy is dissipated again; then the fluid passes through the flow channel 80 of the baffle 8, and is immediately guided by the lower guide plate 7 to the wall of the cylinder 2, and when the fluid collides with the cylinder wall, part of its energy is dissipated again; the fluid that has almost exhausted its energy reaches the first step top wall 111 of the cylinder bottom 2 through the second flow port 70, and is combed and rectified in the process of flowing along the horizontal wall portion 1111 and the slightly upturned inclined wall portion 1112, and finally enters the suction pit 12 in a stable and uniform flow state, providing good water inlet conditions for the submersible pump 3 and improving the stability of the operation of the submersible pump 3.

[0069] The present invention effectively consumes the energy of the fluid entering the pump station through the gushing chamber 200 and the rectifying device. The fluid in the gushing chamber changes its flow direction many times like a surge and hits the cylinder, partition, upper guide plate, lower guide plate, and baffle, which can effectively dissipate a large amount of energy in the fluid, making the fluid flow at the liquid inlet of the submersible pump 3 uniform and stable. Therefore, the present invention can effectively expand the capacity without occupying more civil construction area and without using an axial flow pump. For example, the cylinder diameter can reach 3.8m, providing about 1.5m 3 / s single cylinder flow rate; at the same time, because the rectifying device extends the fluid path, the gas in the fluid can be fully analyzed during the flow process, and the gas content in the fluid reaching the suction pit is small, which avoids the fluid directly falling and entraining gas and air and causing other adverse hydraulic phenomena such as water pump cavitation. Therefore, the elevation of the liquid inlet pipe 21 of the prefabricated pump station of the present invention (the distance P from the center line M of the liquid inlet pipe 21 to the bottom of the cylinder) can reach a relatively high height, and still meet the hydraulic conditions of the full-time operation of the water pump, reducing the operation and maintenance costs of the pump station.

[0070] The present invention is shown below Figure 3 The various effect diagrams of the hydraulic conditions of the prefabricated pump station of the embodiment shown in the figure, wherein the cylinder diameter is 3.8m, the elevation of the liquid inlet pipe 21 (the bottom of the cylinder is marked as zero) is 11.4m, and the flow rate is 1.5m3 / s. Since there is no prefabricated pump station with a cylinder diameter of 3.8m, an elevation of the liquid inlet pipe 21 of 11.4m, and a flow rate of 1.5m3 / s in the prior art, the following is a prefabricated pump station with a cylinder diameter of 3.8m, an elevation of the liquid inlet pipe 21 of 11.4m, and a flow rate of 1.5m3 / s. Figure 3 The structures shown are basically the same, but only a partition 5 is provided in the cylinder, and a prefabricated pump station without a rectifier is used as a comparative example to assist in the explanation.

[0071] See also Fig. 7A and Figure 7B , Fig. 7A This is a simulation diagram of the fluid flow pattern in the bottom area of ​​the prefabricated pump station of the comparative example. As shown in the figure, there are many turbulent streamlines and obvious vortices in the bottom area of ​​the pump station; Figure 7B For the present invention Figure 3 The simulation diagram of the fluid flow pattern in the bottom area of ​​the prefabricated pump station of the embodiment is shown in the figure. As shown in the figure, the fluid streamlines in the bottom area of ​​the pump station are smooth and evenly distributed without obvious vortices.

[0072] See also Fig. 8A and Figure 8B , Fig. 8A This is a simulated flow diagram of the gas distribution in the suction pit of the prefabricated pump station of the comparative example. As shown in the figure, there is a lot of gas in the suction pit; Figure 8B For the present invention Figure 3 The simulated flow diagram of the gas distribution of the prefabricated pump station of the embodiment is shown in the figure. There is less gas in the fluid in the suction pit.

[0073] See also Fig. 9A and Fig. 9B , Fig. 9A The simulation diagram of the flow field distribution and gas volume fraction distribution inside the prefabricated pump station for comparison is shown in the figure. As shown in the figure, the fluid in the suction pit still has a large amount of water inflow energy that cannot be dissipated, and entrains a certain amount of gas, which has a negative impact on the long-term operation of the water pump, such as cavitation, vibration, performance degradation, etc. Fig. 9B For the present invention Figure 3 The simulation diagram of the flow field distribution and gas volume fraction distribution inside the prefabricated pump station of the embodiment, as shown in the figure, greatly improves the above situation, eliminates the water inlet energy and greatly reduces the risk of gas entrapment.

[0074] See also Fig. 10A and Fig. 10B , Fig. 10A This is a simulation diagram of gas precipitation during the fluid flow of the prefabricated pump station of the comparative example. It can be seen from the figure that almost no gas is precipitated during the process of the fluid flowing from the liquid inlet to the suction pit, and the fluid reaching the suction pit still contains a large amount of gas; Fig. 10B The present invention Figure 3 The simulation diagram of gas precipitation during the fluid flow of the prefabricated pump station of the embodiment shows that a large amount of gas is precipitated in the water gushing cavity during the process of the fluid flowing from the liquid inlet to the suction pit, and only a very small amount of gas reaches the suction pit with the fluid.

[0075] See also Fig.11A and Fig. 11B , Fig.11AThis is a simulation diagram of energy consumption during the fluid flow process of the prefabricated pump station of the comparative example. It can be seen from the figure that the gas consumes less energy during the process of the fluid flowing from the liquid inlet to the suction pit, and the fluid reaching the suction pit still has a large amount of energy; Fig. 11B The present invention Figure 3 The simulation diagram of energy consumption during fluid flow of the prefabricated pump station of the embodiment shows that a large amount of energy is consumed in the water gushing cavity during the process of the fluid flowing from the liquid inlet to the suction pit, and the fluid reaching the suction pit has only a small amount of energy.

[0076] From the above comparison, it can be seen that the rectifying device in the present invention can obviously consume fluid energy and remove gas in the fluid, so that the fluid flow reaching the suction pit is uniform and stable, with low gas content, creating good conditions for the normal operation of the submersible pump.

[0077] See also Fig.12 , Fig.12 Schematic diagram of the pre-swirl angle of the water pump inlet of the prefabricated pump station of the comparative example and the present invention. The 2018 edition of the American Hydraulic Association Pump Station Design Standard stipulates that the pre-swirl angle of the water pump inlet under long-term operation conditions shall not exceed 5 degrees. Fig.12 As shown, the inflow pre-swirl angle B0 in the above comparative example is 15.23 degrees, which fails to meet the standard; the inflow pre-swirl angle of the prefabricated pump station of the present invention is only 2.54 degrees, which is far below the requirement of the standard.

[0078] See also Fig.13 , Fig.13 The figure is a schematic diagram of the offset of the average axial velocity of the suction port of the prefabricated pump station of the comparative example and the present invention. According to the 2018 edition of the American Hydraulic Association Pump Station Design Standard, the offset of the average axial velocity of the suction port of the pump under long-term operation conditions shall not exceed 10%. Fig.13 As shown, the offset B0 data of the average axial velocity of some suction ports in the comparative example has exceeded the design standard by 20%, which cannot meet the long-term operation conditions of the water pump; the offset B11 of the average axial velocity of the suction port of the prefabricated pump station of the present invention is basically within the range of 10%, which meets the requirements of the standard.

[0079] The prefabricated pump station of the present invention is not only applicable to the fields of sewage transportation, rainwater transportation, lake water, river water, surface water, groundwater and other raw water transportation, but also applicable to other fields requiring fluid transportation.

[0080] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A prefabricated pump station, comprising a cylinder bottom (1) and a cylinder body (2) arranged on the cylinder bottom (1), wherein the cylinder body (2) is provided with a liquid inlet (21), and a submersible pump unit is installed on the cylinder bottom (1), characterized in that: It also comprises a partition (5) and a rectifying device, wherein the partition (5) has two opposite sides and an opposite top and bottom, the top of the partition (5) is not lower than the lower edge of the liquid inlet (21), the bottom is higher than the upper surface of the cylinder bottom (1), the two sides are respectively fixed to the cylinder body (2), and the partition (5) divides the internal space of the cylinder body (2) into a pump chamber (300) away from the liquid inlet (21) and a water gushing chamber (200) close to the liquid inlet (21). 00), the submersible pump unit is installed in the pump chamber (300), the rectifying device is arranged in the water gushing chamber (200), the rectifying device comprises an upper guide plate (6), the upper guide plate (6) is fixed to the upper part of the partition (5) and is located below the liquid inlet (21), and a first flow opening (60) for fluid to pass through is formed between the end of the upper guide plate (6) away from the center line (X) of the cylinder (2) and the cylinder (2).

2. The prefabricated pump station according to claim 1, characterized in that: The top end of the partition (5) is located between the center line of the liquid inlet (21) and the upper edge of the liquid inlet (21).

3. The prefabricated pump station according to claim 1, characterized in that: The upper guide plate (6) has an upper end and a lower end opposite to each other and two opposite sides, the upper end is fixed to the partition plate, the two sides of the upper guide plate (6) are fixed to the cylinder (2), and the first flow port (60) is formed between the lower end and the cylinder (2).

4. The prefabricated pump station according to claim 3, characterized in that: The distance between the upper end and the lower end of the upper guide plate (6) is 0.1D-0.3D.

5. The prefabricated pump station according to claim 1, characterized in that: The included angle (α) between the upper guide plate (6) and the partition plate (5) is 30°-90°.

6. The prefabricated pump station according to claim 1, characterized in that: The rectifying device further comprises a lower guide plate (7), which is fixed to the bottom end of the partition plate (5) and is higher than the upper surface of the cylinder bottom (1), and a second flow opening (70) for fluid to pass through is formed between the cylinder (2) and the side of the lower guide plate (7) away from the center line (X) of the cylinder (2).

7. The prefabricated pump station according to claim 6, characterized in that: The lower guide plate (7) has an upper end and a lower end opposite to each other and two opposite sides, the upper end is fixed to the partition plate (5), the two sides of the upper guide plate (6) are fixed to the cylinder (2), and the second flow port (70) is formed between the lower end and the cylinder (2).

8. The prefabricated pump station according to claim 7, characterized in that: The distance between the upper end and the lower end of the lower guide plate (7) is 0.1D-0.3D.

9. The prefabricated pump station according to claim 6, characterized in that: The lower guide plate (7) is inclined toward the cylinder bottom (1) in a direction away from the center line (X) of the cylinder body (2), and the angle (β) between the lower guide plate (7) and the partition plate (5) is 45°-85°.

10. The prefabricated pump station according to any one of claims 1 to 9, characterized in that: The rectifying device further comprises a baffle (8) fixed to the partition (5) and / or the cylinder (2), the baffle (8) being located below the upper guide plate (6), the baffle (8) being provided with a flow passage (80), the flow passage (80) being close to the partition (5).

11. The prefabricated pump station according to claim 10, characterized in that: The baffle (8) is close to the lower end of the partition (5).

12. The prefabricated pump station according to claim 10, characterized in that: The baffle (8) has an arcuate edge and a straight edge connecting two ends of the arcuate edge, and the arcuate edge is fixed to the cylinder (2).

13. The prefabricated pump station according to claim 10, characterized in that: A protrusion (81) extends outward from the middle of the straight edge of the baffle (8), and the protrusion (81) is fixedly connected to the partition (5), and the gap between the straight edges on both sides of the protrusion (81) and the partition (5) forms the flow channel (80).

14. The prefabricated pump station according to claim 13, characterized in that: The gap is 100-300mm.

15. The prefabricated pump station according to claim 10, characterized in that: The rectifying device further comprises a baffle (8) fixed to the partition (5) and / or the cylinder (2), the baffle (8) being provided with a flow passage (80), the baffle (8) being located above the lower guide plate (7), and the distance (S) between the two being 100-300 mm.

16. The prefabricated pump station according to any one of claims 1 to 9, characterized in that: The diameter (D) of the cylinder (2) is greater than or equal to 3.8 m; and / or the distance (P) between the center line (M) of the liquid inlet (21) and the lower surface of the cylinder bottom (1) is 1D-3D, where D is the diameter of the cylinder (2).

17. The prefabricated pump station according to any one of claims 1 to 9, characterized in that: The partition (5) is parallel to the center line (X) of the cylinder (2), and the distance (E) between the partition (5) and the center line (X) of the cylinder (2) is 0.2D-0.3D; the height (H) of the partition (5) is 0.4D-0.6D.

18. The prefabricated pump station according to any one of claims 1 to 9, characterized in that: The cylinder bottom (1) comprises a cylindrical cylinder bottom side wall (10) and a first step (11) and a second step (12) which are arranged in the cylinder bottom side wall (10) and are arranged opposite to each other. The space between the first step (11) and the second step (12) is a liquid suction pit (12). The submersible pump unit is installed on the second step (11) and comprises at least one submersible pump. The liquid suction port of the submersible pump is located in the liquid suction pit (12).

19. The prefabricated pump station according to claim 18, characterized in that: The first step (11) is located below the water gushing chamber (200), and comprises a first step top wall (111) and a first step side wall (112) which are connected to each other at one end, the other end of the first step top wall (111) is fixed to the cylinder bottom side wall (10), and the other end of the first step side wall (112) is fixed to the bottom of the cylinder body (2).

20. The prefabricated pump station according to claim 19, characterized in that: The first step top wall (111) includes a horizontal wall portion (1111) and an inclined wall portion (1112) which are connected to each other at one end, the other end of the horizontal wall portion (1111) is fixed to the cylinder bottom side wall (10), and the other end of the inclined wall portion (1112) is fixed to the first step side wall (112), and the inclined wall portion (1112) is inclined upward from the horizontal wall portion (1111) to the first step side wall (112), and an obtuse angle (γ) is formed between the two, and the obtuse angle (γ) is 160°-178°.

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