Large flow axial flow pump and drainage vehicle

Abstract

The application discloses a large-flow axial flow pump and a drainage vehicle, the large-flow axial flow pump comprises an impeller and a guide wheel, and through reasonable design of various parameters of the impeller and the guide wheel, the large-flow axial flow pump has the advantages of large flow, high efficiency, compact size and the like, and can solve the problems of insufficient drainage operation capacity and low efficiency in rescue and emergency rescue.

Description

Technical Field

[0001] This invention belongs to the field of axial flow pump technology, specifically relating to a high-flow axial flow pump and a drainage vehicle. Background Technology

[0002] In recent years, with the frequent occurrence of extreme rainfall in various regions, urban flooding and other disasters have also occurred frequently. Currently, drainage operations are mainly carried out using pumps and drainage trucks equipped with small water pumps (such as mixed-flow pumps and self-priming pumps). However, the efficiency and capacity of these operations are not high, making it difficult to meet the needs of urgent rescue and flood drainage operations.

[0003] Axial flow pumps, with their large flow rate, low head, and high efficiency, play an important role in urban flood control and drainage, agricultural irrigation, and other fields where the drop is not too large (<10m). However, existing axial flow pumps are generally large and bulky, making them difficult to install in drainage vehicles with limited space. Therefore, there is an urgent need to develop vehicle-mounted, high-efficiency, high-flow-rate, and compact axial flow pumps. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a high-flow axial flow pump and drainage vehicle, which has the advantages of high flow rate, high efficiency, and compact size, and can solve the problems of insufficient capacity and low efficiency in rescue and disaster relief drainage operations.

[0005] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0006] In a first aspect, the present invention provides a high-flow-rate axial flow pump, including an impeller;

[0007] The impeller rim diameter is D2 mm, and the blade tip clearance is (0.5~1.5)*10. -3 *D2mm;

[0008] The impeller hub diameter D1 is (0.48±0.03)*D2mm;

[0009] The distance L1 between the end point of the impeller blade rim and the axial direction of the pump is (0.17±0.03)*D2mm;

[0010] The distance L2 between the impeller blade hub end point and the pump axial direction is (0.21±0.03)*D2mm;

[0011] The lateral chord length L of the impeller blade rim is (0.66±0.05)*D2mm;

[0012] The impeller blade's intermediate flow surface is evenly divided into 5 sections from the hub to the rim. The inlet and outlet angles of each section are:

[0013] The first cross-section of the impeller blade has an inlet angle β11 = 20° to 25° and an outlet angle β21 = 25° to 35°.

[0014] The second cross section of the impeller blade has an inlet angle β12 = 15°~20° and an outlet angle β22 = 17°~24°.

[0015] The third section of the impeller blade has an inlet angle β13 = 12°~17° and an outlet angle β23 = 15°~18°.

[0016] The fourth section of the impeller blade has an inlet angle β14 = 10° to 14° and an outlet angle β24 = 14° to 18°.

[0017] The impeller blades have an inlet angle β15 of 5° to 10° and an outlet angle β25 of 7° to 12° at the fifth cross section.

[0018] Optionally, the impeller rim diameter is D2 mm and the blade tip clearance is 10 mm. -3 *D2mm;

[0019] The impeller hub diameter D1 is 0.48 * D2 mm;

[0020] The distance L1 between the end point of the impeller blade rim and the axial direction of the water pump is 0.17*D2mm;

[0021] The distance L2 between the impeller blade hub end point and the pump axial direction is 0.21*D2mm;

[0022] The lateral chord length L of the impeller blade rim is 0.66 * D2 mm;

[0023] The impeller blade's intermediate flow surface is evenly divided into 5 sections from the hub to the rim. The inlet and outlet angles of each section are: the first section of the impeller blade has an inlet angle β11 of 20° to 25° and an outlet angle β21 of 25° to 35°.

[0024] The second cross section of the impeller blade has an inlet angle β12 = 15°~20° and an outlet angle β22 = 17°~24°.

[0025] The third section of the impeller blade has an inlet angle β13 = 12°~17° and an outlet angle β23 = 15°~18°.

[0026] The fourth section of the impeller blade has an inlet angle β14 = 10° to 14° and an outlet angle β24 = 14° to 18°.

[0027] The impeller blades have an inlet angle β15 of 5° to 10° and an outlet angle β25 of 7° to 12° at the fifth cross section.

[0028] Optionally, the impeller has 4 to 5 blades.

[0029] Optionally, the impeller has 4 blades.

[0030] Optionally, the aforementioned high-flow-rate axial flow pump further includes a guide wheel.

[0031] The distance L3 between the end point of the guide vane hub and the axial direction of the water pump is (0.22±0.03)*D2mm;

[0032] The distance L4 between the end point of the guide vane rim and the axial direction of the water pump is (0.26±0.03)*D2mm;

[0033] The chord length L of the guide vane blade rim side end point is (0.27±0.05)*D2mm;

[0034] The diffusion angle θ of the guide wheel cone section is 1.5°~4.5°;

[0035] The guide vane's intermediate flow surface is evenly divided into 5 sections from the hub to the rim. The inlet and outlet angles of each section are:

[0036] The first cross section of the guide vane has an inlet angle β31 = 32°~40° and an outlet angle β41 = 88°~93°.

[0037] The second cross section of the guide vane has an inlet angle β32 = 40°~48° and an outlet angle β42 = 88°~93°.

[0038] The guide vane blade has an inlet angle β33 = 48°~55° and an outlet angle β43 = 88°~93° at the third cross section.

[0039] The guide vane blade has an inlet angle β34 of 50° to 58° and an outlet angle β44 of 88° to 93° at the fourth cross section.

[0040] The fifth section of the guide vane has an inlet angle β35 = 58°~72° and an outlet angle β45 = 88°~93°.

[0041] Optionally, the distance L3 between the hub end point of the guide vane and the axial direction of the water pump is 0.22*D2mm;

[0042] The distance L4 between the end point of the guide vane rim and the axial direction of the water pump is 0.26*D2mm;

[0043] The chord length L of the guide vane rim side end point is 0.27*D2mm;

[0044] The diffusion angle θ of the guide wheel cone section is 1.5°~4.5°;

[0045] The flow surface of the guide vane is evenly divided into 5 sections from the hub to the rim, and the inlet and outlet angles of each section are:

[0046] The first cross section of the guide vane has an inlet angle β31 = 32°~40° and an outlet angle β41 = 88°~93°.

[0047] The second cross section of the guide vane has an inlet angle β32 = 40°~48° and an outlet angle β42 = 88°~93°.

[0048] The guide vane blade has an inlet angle β33 = 48°~55° and an outlet angle β43 = 88°~93° at the third cross section.

[0049] The guide vane blade has an inlet angle β34 of 50° to 58° and an outlet angle β44 of 88° to 93° at the fourth cross section.

[0050] The fifth section of the guide vane has an inlet angle β35 = 58°~72° and an outlet angle β45 = 88°~93°.

[0051] Optionally, the guide wheel has 6 to 9 blades.

[0052] Optionally, the number of guide wheel blades and the number of impeller blades are coprime numbers.

[0053] Optionally, the guide wheel has 7 blades.

[0054] In a second aspect, the present invention provides a drainage vehicle, comprising the high-flow axial flow pump described in any one of the first aspects.

[0055] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0056] This invention provides a vehicle-mounted axial flow drainage pump suitable for drainage trucks through forward design and parameter optimization. It has the advantages of high efficiency, large flow rate and compact size. The axial flow pump and drainage truck are particularly suitable for urban flooding with small elevation differences and agricultural irrigation in low-lying plains, which can bring good economic and social value. Attached Figure Description

[0057] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0058] Figure 1 This is a schematic diagram of the overall structure of a drainage pump according to an embodiment of the present invention;

[0059] Figure 2 This is a axial view of the working wheel according to an embodiment of the present invention;

[0060] Figure 3 This is a schematic diagram of the impeller shape according to an embodiment of the present invention;

[0061] Figure 4 This is a schematic diagram of the guide wheel's external shape according to an embodiment of the present invention;

[0062] Figure 5 This is a comparison graph of the performance curves of one embodiment of the present invention and a common water pump of the same model.

[0063] Among them: 1-inlet section, 2-impeller, 3-guide wheel, 4-outlet guide cap, 5-outlet bend section, 6-transmission device. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of protection of the invention.

[0065] The application principle of the present invention will be described in detail below with reference to the accompanying drawings.

[0066] Example 1

[0067] Axial flow pumps, with their large flow rate, low head, and high efficiency, play an important role in urban flood control and drainage, agricultural irrigation, and other fields where the drop is not too large (<10m). However, existing axial flow pumps are generally large and bulky, making them difficult to install in drainage vehicles with limited space. To address this, this invention develops a vehicle-mounted, high-efficiency, high-flow-rate, and compact axial flow pump.

[0068] This invention provides a high-flow-rate axial flow pump, comprising an inlet section, an impeller, a guide wheel, an outlet guide cap, an outlet bend section, and a transmission device connected in sequence. The inlet section 1 includes a tapered pipe and a straight pipe. The impeller 2 includes an arc-shaped inlet guide cap connected to a hub and impeller blades. The guide wheel 3 includes a hub, a gradually expanding outer cylinder, and guide wheel blades connecting the two. The outlet guide cap 4 is connected to the tail end face of the guide wheel 3. The outlet bend section 5 is connected to the gradually expanding outer cylinder end face of the guide wheel 3. The outlet guide cap 4 and the outlet bend section 5 together form a water guiding channel, minimizing pressure loss when the fluid flows out of the bend. The impeller 2 is connected to a power source via a transmission device 6. See details below. Figure 1 , Figure 3 and Figure 4 The impeller 2 and guide wheel 3 together constitute the working wheel, see details below. Figure 2 , Figure 2 In this context, β1 is the impeller inlet angle, β1i represents the impeller inlet angle of the i-th section, β2 represents the impeller outlet angle, β1i represents the impeller outlet angle of the i-th section, β3 is the guide wheel inlet angle, β3i represents the guide wheel inlet angle of the i-th section, β4 is the guide wheel outlet angle, and β4i represents the guide wheel outlet angle of the i-th section.

[0069] The impeller rim diameter is D2 mm, and the blade tip clearance is (0.5~1.5)*10.-3 *D2mm;

[0070] The impeller hub diameter D1 is (0.48±0.03)*D2mm;

[0071] The distance L1 between the end point of the impeller blade rim and the axial direction of the pump is (0.17±0.03)*D2mm;

[0072] The distance L2 between the impeller blade hub end point and the pump axial direction is (0.21±0.03)*D2mm;

[0073] The lateral chord length L of the impeller blade rim is (0.66±0.05)*D2mm;

[0074] The impeller blade's intermediate flow surface is evenly divided into 5 sections from the hub to the rim. The inlet and outlet angles of each section are:

[0075] The first cross-section of the impeller blade has an inlet angle β11 = 20° to 25° and an outlet angle β21 = 25° to 35°.

[0076] The second cross section of the impeller blade has an inlet angle β12 = 15°~20° and an outlet angle β22 = 17°~24°.

[0077] The third section of the impeller blade has an inlet angle β13 = 12°~17° and an outlet angle β23 = 15°~18°.

[0078] The fourth section of the impeller blade has an inlet angle β14 = 10° to 14° and an outlet angle β24 = 14° to 18°.

[0079] The fifth section of the impeller blade has an inlet angle β15 = 5° to 10° and an outlet angle β25 = 7° to 12°.

[0080] The distance L3 between the end point of the guide vane hub and the axial direction of the water pump is (0.22±0.03)*D2mm;

[0081] The distance L4 between the end point of the guide vane rim and the axial direction of the water pump is (0.26±0.03)*D2mm;

[0082] The chord length L of the guide vane blade rim side end point is (0.27±0.05)*D2mm;

[0083] The diffusion angle θ of the guide wheel cone section is 1.5°~4.5°;

[0084] The flow surface of the guide vane is evenly divided into 5 sections from the hub to the rim, and the inlet and outlet angles of each section are:

[0085] The first cross section of the guide vane has an inlet angle β31 = 32°~40° and an outlet angle β41 = 88°~93°.

[0086] The second cross section of the guide vane has an inlet angle β32 = 40°~48° and an outlet angle β42 = 88°~93°.

[0087] The guide vane blade has an inlet angle β33 = 48°~55° and an outlet angle β43 = 88°~93° at the third cross section.

[0088] The guide vane blade has an inlet angle β34 of 50° to 58° and an outlet angle β44 of 88° to 93° at the fourth cross section.

[0089] The fifth section of the guide vane has an inlet angle β35 = 58°~72° and an outlet angle β45 = 88°~93°.

[0090] In this embodiment of the invention, a vehicle-mounted axial flow drainage pump suitable for drainage trucks is obtained through forward design and parameter optimization. It has the advantages of high efficiency, large flow rate and compact size. The axial flow pump and drainage truck are particularly suitable for urban flooding with small elevation differences and agricultural irrigation in low-lying plains, which can bring good economic and social value.

[0091] In a preferred embodiment of the present invention, the impeller rim diameter is D2 mm and the blade tip clearance is 10 mm. -3 *D2mm;

[0092] The impeller hub diameter D1 is 0.48 * D2 mm;

[0093] The distance L1 between the end point of the impeller blade rim and the axial direction of the water pump is 0.17*D2mm;

[0094] The distance L2 between the impeller blade hub end point and the pump axial direction is 0.21*D2mm;

[0095] The lateral chord length L of the impeller blade rim is 0.66 * D2 mm;

[0096] The impeller blade's intermediate flow surface is evenly divided into 5 sections from the hub to the rim. The inlet and outlet angles of each section are:

[0097] The first cross-section of the impeller blade has an inlet angle β11 = 20° to 25° and an outlet angle β21 = 25° to 35°.

[0098] The second cross section of the impeller blade has an inlet angle β12 = 15°~20° and an outlet angle β22 = 17°~24°.

[0099] The third section of the impeller blade has an inlet angle β13 = 12°~17° and an outlet angle β23 = 15°~18°.

[0100] The fourth section of the impeller blade has an inlet angle β14 = 10° to 14° and an outlet angle β24 = 14° to 18°.

[0101] The impeller blades have an inlet angle β15 of 5° to 10° and an outlet angle β25 of 7° to 12° at the fifth cross section.

[0102] In a preferred embodiment of the present invention, the distance L3 between the hub end point of the guide vane and the axial direction of the water pump is 0.22*D2mm;

[0103] The distance L4 between the end point of the guide vane rim and the axial direction of the water pump is 0.26*D2mm;

[0104] The chord length L of the guide vane rim side end point is 0.27*D2mm;

[0105] The diffusion angle θ of the guide wheel cone section is 1.5°~4.5°;

[0106] The flow surface of the guide vane is evenly divided into 5 sections from the hub to the rim, and the inlet and outlet angles of each section are:

[0107] The first cross section of the guide vane has an inlet angle β31 = 32°~40° and an outlet angle β41 = 88°~93°.

[0108] The second cross section of the guide vane has an inlet angle β32 = 40°~48° and an outlet angle β42 = 88°~93°.

[0109] The guide vane blade has an inlet angle β33 = 48°~55° and an outlet angle β43 = 88°~93° at the third cross section.

[0110] The guide vane blade has an inlet angle β34 of 50° to 58° and an outlet angle β44 of 88° to 93° at the fourth cross section.

[0111] The fifth section of the guide vane has an inlet angle β35 = 58°~72° and an outlet angle β45 = 88°~93°.

[0112] In a preferred embodiment of the present invention, the number of impeller blades is 4 to 5, the number of guide wheel blades is 6 to 9, and the number of guide wheel blades and the number of impeller blades are coprime to prevent resonance.

[0113] In a preferred embodiment, the impeller has 4 blades. The guide wheel has 7 blades.

[0114] The design of the high-flow axial flow pump in this embodiment of the invention will be described in detail below with reference to a specific implementation method, and its effect will be verified.

[0115] Due to the working characteristics of turbomachinery, a series of pump design parameters, either scaled up or scaled down, can be obtained based on a fundamental model while maintaining a constant specific speed. This embodiment illustrates a parameter combination for an axial flow pump with an impeller diameter of 560mm and an operating point parameter of 5000m³ / h. 3 / h, head 12.2m.

[0116] When the impeller rim diameter D2 is 560mm, the optimized structural parameters are as follows:

[0117] Blade tip clearance: 0.28–0.84 mm;

[0118] The impeller hub diameter D1 is 252–285.6 mm;

[0119] The distance L1 between the end point of the impeller blade rim and the axial direction of the water pump is 78.4–112 mm;

[0120] The distance L2 between the impeller blade hub end point and the pump axial direction is 100.8–134.4 mm;

[0121] The lateral chord length L of the impeller blade rim is 341.6–397.6 mm;

[0122] The impeller blade's intermediate flow surface is evenly divided into 5 sections from the hub to the rim. The inlet and outlet angles of each section are: the first section of the impeller blade has an inlet angle β11 of 20° to 25° and an outlet angle β21 of 25° to 35°.

[0123] The second cross section of the impeller blade has an inlet angle β12 = 15°~20° and an outlet angle β22 = 17°~24°.

[0124] The third section of the impeller blade has an inlet angle β13 = 12°~17° and an outlet angle β23 = 15°~18°.

[0125] The fourth section of the impeller blade has an inlet angle β14 = 10° to 14° and an outlet angle β24 = 14° to 18°.

[0126] The fifth section of the impeller blade has an inlet angle β15 = 5° to 10° and an outlet angle β25 = 7° to 12°.

[0127] The diffusion angle θ of the guide wheel cone section is 1.5°~4.5°;

[0128] The distance L3 between the end point of the guide vane hub side and the pump axial direction is 106.4 to 140 mm;

[0129] The distance L4 between the end point of the guide vane rim and the axial direction of the water pump is 128.8–162.4 mm;

[0130] The chord length L of the guide vane blade rim side end point is 123.2–179.2 mm;

[0131] The flow surface of the guide vane is evenly divided into 5 sections from the hub to the rim, and the inlet and outlet angles of each section are:

[0132] The first cross section of the guide vane has an inlet angle β31 = 32°~40° and an outlet angle β41 = 88°~93°.

[0133] The second cross section of the guide vane has an inlet angle β32 = 40°~48° and an outlet angle β42 = 88°~93°.

[0134] The guide vane blade has an inlet angle β33 = 48°~55° and an outlet angle β43 = 88°~93° at the third cross section.

[0135] The guide vane blade has an inlet angle β34 of 50° to 58° and an outlet angle β44 of 88° to 93° at the fourth cross section.

[0136] The fifth section of the guide vane has an inlet angle β35 = 58°~72° and an outlet angle β45 = 88°~93°.

[0137] The impeller has 4 blades, and the guide wheel has 7 blades.

[0138] Further design of the parameters for the high-flow axial flow pump yielded an optimal parameter combination:

[0139] The impeller rim diameter is 560 mm, and the blade tip clearance is 0.56 mm.

[0140] The impeller hub diameter D1 is 268.8 mm;

[0141] The distance L1 between the end point of the impeller blade rim and the axial direction of the water pump is 95.2 mm;

[0142] The distance L2 between the impeller blade hub end point and the pump axial direction is 117.6 mm;

[0143] The lateral chord length L of the impeller blade rim is 369.6 mm;

[0144] The impeller blade's intermediate flow surface is evenly divided into 5 sections from the hub to the rim. The inlet and outlet angles of each section are: the first section of the impeller blade has an inlet angle β11 of 20° to 25° and an outlet angle β21 of 25° to 35°.

[0145] The second cross section of the impeller blade has an inlet angle β12 = 15°~20° and an outlet angle β22 = 17°~24°.

[0146] The third section of the impeller blade has an inlet angle β13 = 12°~17° and an outlet angle β23 = 15°~18°.

[0147] The fourth section of the impeller blade has an inlet angle β14 = 10° to 14° and an outlet angle β24 = 14° to 18°.

[0148] The fifth section of the impeller blade has an inlet angle β15 = 5° to 10° and an outlet angle β25 = 7° to 12°.

[0149] The diffusion angle θ of the guide wheel cone section is 1.5°~4.5°;

[0150] The distance L3 between the hub end point of the guide vane and the axial direction of the water pump is 123.2 mm;

[0151] The distance L4 between the end point of the guide vane rim and the axial direction of the water pump is 145.6 mm;

[0152] The chord length L at the side end of the guide vane rim is 151.2 mm;

[0153] The flow surface of the guide vane is evenly divided into 5 sections from the hub to the rim, and the inlet and outlet angles of each section are:

[0154] The first cross section of the guide vane has an inlet angle β31 = 32°~40° and an outlet angle β41 = 88°~93°.

[0155] The second cross section of the guide vane has an inlet angle β32 = 40°~48° and an outlet angle β42 = 88°~93°.

[0156] The guide vane blade has an inlet angle β33 = 48°~55° and an outlet angle β43 = 88°~93° at the third cross section.

[0157] The guide vane blade has an inlet angle β34 of 50° to 58° and an outlet angle β44 of 88° to 93° at the fourth cross section.

[0158] The fifth section of the guide vane has an inlet angle β35 = 58°~72° and an outlet angle β45 = 88°~93°.

[0159] The impeller has 4 blades, and the guide wheel has 7 blades.

[0160] The maximum thickness of the impeller blades at the hub is no more than 16 mm, and the maximum thickness at the rim is no more than 10 mm; the maximum thickness of the guide vane blades is no more than 12 mm. The normal thickness of the impeller blades and guide vane blades at the inlet and outlet is 4 mm.

[0161] The axial flow pump designed according to the above parameters has a maximum length of less than 1.3 meters, a minimum suction height of less than 0.3 meters, and a maximum flow rate of 6500 m³ / h. 3With a maximum efficiency of 85% and superior length and minimum suction height compared to existing commercial water pumps, it is especially suitable as a vehicle-mounted water pump for emergency rescue drainage vehicles.

[0162] like Figure 5 The figure shown is a comparison of the results of this embodiment (i.e., this case) with the performance curves of a common water pump of the same model. It can be seen that the efficiency and head of this embodiment are significantly better than those of the common water pump in the high flow range.

[0163] Example 2

[0164] This invention provides a drainage vehicle, including the high-flow axial flow pump described in any one of Embodiment 1.

[0165] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A high-flow-rate axial flow pump, comprising an impeller; characterized in that: The impeller rim diameter is D2 mm, and the blade tip clearance is (0.5~1.5)*10. -3 *D2mm; The impeller hub diameter D1 is (0.48±0.03)*D2mm; The distance L1 between the end point of the impeller blade rim and the axial direction of the pump is (0.17±0.03)*D2mm; The distance L2 between the impeller blade hub end point and the pump axial direction is (0.21±0.03)*D2mm; The lateral chord length L of the impeller blade rim is (0.66±0.05)*D2mm; The impeller blade's intermediate flow surface is evenly divided into 5 sections from the hub to the rim. The inlet and outlet angles of each section are: The first cross-section of the impeller blade has an inlet angle β11 = 20°~25° and an outlet angle β21 = 25°~35°. The second cross-section of the impeller blade has an inlet angle β12 = 15°~20° and an outlet angle β22 = 17°~24°. The third section of the impeller blade has an inlet angle β13 = 12°~17° and an outlet angle β23 = 15°~18°. The fourth section of the impeller blade has an inlet angle β14 = 10°~14° and an outlet angle β24 = 14°~18°. The fifth section of the impeller blade has an inlet angle β15 = 5°~10° and an outlet angle β25 = 7°~12°. The distance L3 between the end point of the guide vane hub and the pump axial direction is (0.22±0.03)*D2mm; The distance L4 between the end point of the guide vane rim and the axial direction of the water pump is (0.26±0.03)*D2mm; The chord length L' of the guide vane blade rim side end point is (0.27±0.05)*D2mm; The diffusion angle θ of the guide wheel cone section is 1.5°~4.5°; The flow surface of the guide vane is evenly divided into 5 sections from the hub to the rim, and the inlet and outlet angles of each section are: The first cross-section of the guide vane has an inlet angle β31 of 32°~40° and an outlet angle β41 of 88°~93°. The second cross section of the guide vane has an inlet angle β32 = 40°~48° and an outlet angle β42 = 88°~93°. The guide vane blade has an inlet angle β33 = 48°~55° and an outlet angle β43 = 88°~93° at the third cross section. The guide vane blade has an inlet angle β34 = 50°~58° and an outlet angle β44 = 88°~93° at the fourth section. The fifth section of the guide vane has an inlet angle β35 = 58°~72° and an outlet angle β45 = 88°~93°.

2. The high-flow-rate axial flow pump according to claim 1, characterized in that: The impeller rim diameter is D2 mm, and the blade tip clearance is 10 mm. -3 *D2mm; The impeller hub diameter D1 is 0.48 * D2 mm; The distance L1 between the end point of the impeller blade rim and the axial direction of the water pump is 0.17*D2mm; The distance L2 between the impeller blade hub end point and the pump axial direction is 0.21*D2mm; The lateral chord length L of the impeller blade rim is 0.66 * D2 mm.

3. A high-flow-rate axial flow pump according to claim 1 or 2, characterized in that: The impeller has 4 to 5 blades.

4. A high-flow-rate axial flow pump according to claim 1, characterized in that: The distance L3 between the end point of the guide vane hub and the pump axial direction is 0.22*D2mm; The distance L4 between the end point of the guide vane rim and the axial direction of the water pump is 0.26*D2mm; The chord length L' of the guide vane blade rim side end point is 0.27*D2mm.

5. A high-flow-rate axial flow pump according to claim 1, characterized in that: The guide wheel has 6 to 9 blades.

6. A high-flow-rate axial flow pump according to claim 5, characterized in that: The number of guide wheel blades and the number of impeller blades are coprime numbers.

7. A high-flow-rate axial flow pump according to claim 5, characterized in that: The guide wheel has 7 blades.

8. A drainage vehicle, characterized in that, The high-flow axial flow pump includes any one of claims 1-7.

Images