阅读说明：本技术 前置竖井式贯流泵装置系列出水流道及其应用方法 (Series water outlet flow passage of front-located shaft type tubular pump device and application method thereof ) 是由 陆林广 徐磊 陆伟刚 刘军 施伟 孙世宏 于 2019-09-11 设计创作，主要内容包括：本发明公开了前置竖井式贯流泵装置系列出水流道及其应用方法,属于水利工程泵站技术领域。其特征是：提供前置竖井式贯流泵装置系列出水流道12种方案的断面位置图和断面数据表；根据拟应用本发明的泵站的出水流道出口断面宽度和水泵名义平均流速在所提供的系列出水流道方案中确定适合的出水流道方案；本发明提供的系列出水流道不仅水力性能优异、应用方便,而且适应性强、覆盖面宽,可适用于各种不同出水流道出口宽度与不同水泵名义平均流速的多种组合情况,流道扩散段底边倾角、流道闸门段长度和中隔墩尺寸等可根据泵站的实际需要进行必要调整。本发明对保证前置竖井式贯流泵装置出水流道的水力设计质量,确保泵站的稳定和高效运行具有重要意义。(The invention discloses a series of water outlet flow passages of a front-located shaft type tubular pump device and an application method thereof, belonging to the technical field of hydraulic engineering pump stations. The method is characterized in that: providing a section position diagram and a section data table of 12 schemes of the water outlet flow passage of the series of the front shaft type tubular pump devices; determining a proper outlet flow channel scheme in the provided series of outlet flow channel schemes according to the outlet cross section width of the outlet flow channel of the pump station and the nominal average flow speed of the water pump; the series water outlet flow channel provided by the invention has the advantages of excellent hydraulic performance, convenient application, strong adaptability and wide coverage surface, can be suitable for various combination conditions of different water outlet flow channel outlet widths and different nominal average flow rates of water pumps, and the bottom edge inclination angle of the flow channel diffusion section, the length of the flow channel gate section, the size of the partition pier and the like can be adjusted as necessary according to the actual needs of a pump station. The invention has important significance for ensuring the hydraulic design quality of the water outlet flow channel of the front-located shaft type tubular pump device and ensuring the stable and efficient operation of a pump station.)

1. The serial water outlet flow passage of the preposed shaft type tubular pump device is characterized in that the geometric dimension of the water outlet flow passage of the preposed shaft type tubular pump device is represented by relative value taking the diameter D of a water pump impeller as a reference value; dividing a water outlet flow channel of the front-mounted shaft type tubular pump device into a circular platform section, a diffusion section and a gate section; the shape characteristics of the circular table section: the section shape is round, and the generatrix is a linear diffusion-shaped circular table; the shape characteristics of the diffusion section are as follows: the shape of the cross section is gradually changed from round to rectangle, and the area of the cross section is gradually enlarged; the physical characteristics of the gate section: the molded lines of the plane and the vertical surface of the runner are both straight lines, and the section of the runner is rectangular; the circular truncated cone section receives water flow with a high flow rate flowing out of the guide vane body, the water flow enters the diffusion section after preliminary diffusion and deceleration, the water flow is fully diffused and decelerated in the diffusion section along with the gradual expansion of the cross section area of the flow channel, and finally smoothly flows into the gate section at a low flow rate and flows into the water outlet pool through the gate section; the gate section is used for arranging a working gate and an accident gate;

counting hydraulic design parameters and geometric dimensions of dozens of built pump stations, determining main hydraulic design parameters and geometric dimension value ranges of outlet channels of the front-located shaft type tubular pump device according to the counting and analyzing results, providing key hydraulic design parameters of hydraulic design of the outlet channels of the front-located shaft type tubular pump device, selecting outlet section width of the outlet channels and nominal average flow rate of a water pump as two key parameters of the outlet channels of the series of front-located shaft type tubular pump devices, and determining inlet section diameter D of a circular table section_yjLength L of the circular table section_ytAnd the diameter D of the outlet section of the circular truncated cone section_ycPlane diffusion angle theta of the diffusion section_pmLength L of gate section_zm；

The relative value of the height of the cross section of the outlet of the runner is obtained by calculation according to the nominal average flow speed of the water pump, the flow speed control requirement of the cross section of the outlet of the runner and the relative value of the width of the cross section of the outlet; on the premise of meeting the practical requirements of engineering application and having no more than various grading schemes, the width B of the outlet section of the water outlet flow channel is adjusted within a common range_cGrading, namely grading the nominal average flow speed of the water pump; combining the width of the outlet section and the nominal average flow velocity of the water pump in pairs to obtain a plurality of combination schemes of the water outlet flow channel; in a plurality of combination schemes of the water outlet flow passage, the vertical surface diffusion angle theta of the diffusion section is determined_lmNot less than 0 and a diffusion section equivalent diffusion angle theta_dlRejecting unqualified schemes according to the requirement of less than or equal to 12 degrees to obtain a water outlet channel combination scheme according with the basic requirement of the water outlet channel of the front-located shaft type tubular pump device, and then calculating the height H of the outlet section of the water outlet channel in each scheme according with the requirement_c。

2. The series of outlet channels of a front-located shaft type tubular pump unit as set forth in claim 1, wherein the inlet cross-sectional straight section of the circular truncated cone section is determined based on design experience and statistical resultsDiameter D_yjIs 1.052D, length L of the truncated cone section_ytIs 0.5D and the diameter D of the outlet section of the circular table section_yc1.156D, planar diffusion Angle θ of the diffuser section_pmIs 17 degrees, the length L of the gate section_zmIs 2.2D;

width B of outlet section of water outlet channel_cDividing the nominal average flow speed of the water pump into 2.3D, 2.4D, 2.5D, 2.6D and 2.7D 5 grades, and dividing the nominal average flow speed of the water pump into 3.0m/s, 3.5m/s, 4.0m/s and 4.5m/s 4 grades; combining the width of the section of the outlet with the 5 th grade and the nominal average flow rate of the water pump with the 4 th grade two by two to obtain 20 combination schemes of the water outlet flow channel; in 20 combination schemes of the water outlet flow passage, the vertical surface diffusion angle theta of the diffusion section is adopted_lmNot less than 0 and a diffusion section equivalent diffusion angle theta_dlRejecting unqualified schemes according to the requirement of less than or equal to 12 degrees to obtain 12 effluent channel combination schemes meeting the basic requirements of effluent channels of the front-located shaft type tubular pump device, wherein the combination modes and corresponding numbers of the 12 effluent channel schemes are shown in table 1; the outlet section height H of the water outlet flow channel with 12 schemes_cSee table 2;

TABLE 1 numbering of series outlet flow channel schemes corresponding to 12 combinations of flow channel outlet section width and nominal average water pump flow velocity

Table 212 outlet section height of outlet flow passage

3. The series of outlet channels of the front-located shaft type tubular pump device according to claim 2, wherein the optimum hydraulic design of the channel profile is performed on the 12 combination schemes of the outlet channels respectively under the condition that the average flow rate of the outlet section of the outlet channels meets the requirement, so that the hydraulic performance of each outlet channel scheme is optimized, and finally the series of outlet channels of the front-located shaft type tubular pump device composed of the 12 schemes is obtained.

4. The pre-shaft tubular pump device series water outlet flow passage of claim 3, wherein 12 schemes of three-dimensional shapes of the pre-shaft tubular pump device series water outlet flow passage provide a section position diagram of a flow passage diffusion section and a corresponding section data table, and data in the section data table comprise a section number of the flow passage diffusion section and a longitudinal section upper edge line coordinate (X-ray coordinate)₁，Y₁) Longitudinal section lower line coordinate (X)₂，Y₂) Height of cross section H_wWidth of cross section B_wAnd the radius R of a transition circle with the cross section shape gradually changed from a circle to a rectangle_w(ii) a The 12 schemes of water outlet flow channel data are relative values taking the diameter D of the water pump impeller as a reference value, wherein:

the No. 1 scheme is SC13, the width of the corresponding runner outlet section is 2.3D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the outlet runner diffusion section is listed in Table 3;

the No. 2 scheme is SC14, the width of the corresponding runner outlet section is 2.3D, the nominal average flow rate of the water pump is 3.0m/s, and the section data of the outlet runner diffusion section is listed in Table 4;

the No. 3 scheme is SC22, the corresponding cross section width of the outlet of the flow channel is 2.4D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffusion section of the water outlet flow channel are listed in Table 5;

the No. 4 scheme is SC23, the corresponding cross section width of the outlet of the flow channel is 2.4D, the nominal average flow velocity of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet flow channel are listed in Table 6;

the No. 5 scheme is SC32, the corresponding cross section width of the outlet of the runner is 2.5D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 7;

the number of the 6 th scheme is SC33, the width of the corresponding runner outlet section is 2.5D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the outlet runner diffusion section is listed in Table 8;

the 7 th scheme is numbered as SC41, the width of the corresponding runner outlet section is 2.6D, the nominal average flow speed of the water pump is 4.5m/s, and the section data of the outlet runner diffusion section is listed in Table 9;

the 8 th scheme is numbered as SC42, the width of the corresponding runner outlet section is 2.6D, the nominal average flow rate of the water pump is 4.0m/s, and the section data of the outlet runner diffusion section is listed in Table 10;

the 9 th scheme is numbered as SC43, the corresponding cross section width of the outlet of the flow channel is 2.6D, the nominal average flow velocity of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet flow channel are listed in Table 11;

the No. 10 scheme is SC51, the corresponding cross section width of the outlet of the runner is 2.7D, the nominal average flow velocity of the water pump is 4.5m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 12;

the 11 th scheme is numbered as SC52, the corresponding cross section width of the outlet of the runner is 2.7D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffuser section are listed in Table 13;

the 12 th scheme is numbered as SC53, the width of the corresponding runner outlet section is 2.7D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the outlet runner diffusion section is listed in Table 14;

the flow channel head loss delta h is less than 0.15m when the flow is designed for the water outlet flow channels of the 12 schemes;

TABLE 3 Outlet flow passage diffuser section data sheet with scheme number SC13

TABLE 4 Outlet flow passage diffuser section data sheet with scheme number SC14

TABLE 5 Outlet flow passage diffuser section data sheet with scheme number SC22

TABLE 6 Outlet flow passage diffuser section data sheet with scheme number SC23

TABLE 7 Outlet flow passage diffuser section data sheet with scheme number SC32

TABLE 8 Outlet flow passage diffuser section data sheet with scheme number SC33

TABLE 9 Outlet flow passage diffuser section data sheet with scheme number SC41

TABLE 10 Outlet flow passage diffuser section data sheet with scheme number SC42

TABLE 11 Outlet flow passage diffuser section data sheet with scheme number SC43

TABLE 12 Outlet flow passage diffuser section data sheet with scheme number SC51

TABLE 13 Outlet flow passage diffuser section data sheet with scheme number SC52

TABLE 14 Outlet flow passage diffuser section data sheet with plan number SC53

5. The application method of the series water outlet flow passage of the preposed shaft type tubular pump device is characterized by comprising the following steps:

(1) the geometric dimensions of the series of water outlet flow channels are all represented by relative values with the diameter D of the water pump impeller as a reference value; dividing a water outlet flow channel of the front-mounted shaft type tubular pump device into a circular platform section, a diffusion section and a gate section; the shape characteristics of the circular table section: the section shape is round, and the generatrix is a linear diffusion-shaped circular table; the shape characteristics of the diffusion section are as follows: the shape of the cross section is gradually changed from round to rectangle, and the area of the cross section is gradually enlarged; the physical characteristics of the gate section: the molded lines of the plane and the vertical surface of the runner are both straight lines, and the section of the runner is rectangular; the circular truncated cone section receives water flow with a high flow rate flowing out of the guide vane body, the water flow enters the diffusion section after preliminary diffusion and deceleration, the water flow is fully diffused and decelerated in the diffusion section along with the gradual expansion of the cross section area of the flow channel, and finally smoothly flows into the gate section at a low flow rate and flows into the water outlet pool through the gate section; the gate section is used for arranging a working gate and an accident gate;

counting hydraulic design parameters and geometric dimensions of dozens of built pump stations, determining main hydraulic design parameters and the value range of the geometric dimensions of a water outlet flow passage of the front-located shaft type tubular pump device according to the counting and analyzing results, providing key hydraulic design parameters of hydraulic design of the water outlet flow passage of the front-located shaft type tubular pump device, and selecting the outlet section width of the water outlet flow passage and the nominal average flow rate of a water pump as two key parameters of the water outlet flow passage of the series of front-located shaft type tubular pump devices; determining the diameter D of the inlet cross-section of the circular truncated cone section_yjIs 1.052D, length L of the truncated cone section_ytIs 0.5D and the diameter D of the outlet section of the circular table section_yc1.156D, planar diffusion Angle θ of the diffuser section_pmIs 17 degrees, the length L of the gate section_zmIs 2.2D;

the relative value of the height of the cross section of the outlet of the runner is obtained by calculation according to the nominal average flow speed of the water pump, the flow speed control requirement of the cross section of the outlet of the runner and the relative value of the width of the cross section of the outlet; on the premise of meeting the practical requirements of engineering application and no need of more than various grading schemes, the width B of the outlet section of the water outlet flow passage is adjusted within a common range_cDividing the nominal average flow speed of the water pump into 2.3D, 2.4D, 2.5D, 2.6D and 2.7D 5 grades, and dividing the nominal average flow speed of the water pump into 3.0m/s, 3.5m/s, 4.0m/s and 4.5m/s 4 grades; combining the width of the section of the outlet with the 5 th grade and the nominal average flow rate of the water pump with the 4 th grade two by two to obtain 20 combination schemes of the water outlet flow channel; in 20 combination schemes of the water outlet flow passage, the vertical surface diffusion angle theta of the diffusion section is adopted_lmNot less than 0 and a diffusion section equivalent diffusion angle theta_dlRejecting unqualified schemes under the requirement of less than or equal to 12 degrees to obtain the scheme meeting the basic requirement of the water outlet flow passage of the preposed shaft type tubular pump deviceThe combination schemes of the 12 water outlet flow channel schemes are obtained, and the combination modes and the corresponding numbers of the 12 water outlet flow channel schemes are shown in a table 1; the outlet section height H of the water outlet flow channel with 12 schemes_cSee table 2;

under the condition that the average flow velocity of the outlet section of the water outlet flow channel meets the requirement, the optimal hydraulic design of the flow channel profile is respectively carried out on the 12 combined schemes of the water outlet flow channel, so that the hydraulic performance of each water outlet flow channel scheme is optimal, and finally the series water outlet flow channels of the front-mounted shaft type tubular pump device consisting of the 12 schemes are obtained;

the three-dimensional body of 12 schemes of the water outlet flow passage of the series of the preposed shaft type tubular pump device provides a section position diagram of a flow passage diffusion section and a corresponding section data table, and the data in the section data table comprises the section number of the flow passage diffusion section and the edge line coordinate (X) on the longitudinal section₁，Y₁) Longitudinal section lower line coordinate (X)₂，Y₂) Height of cross section H_wWidth of cross section B_wAnd the radius R of a transition circle with the cross section shape gradually changed from a circle to a rectangle_w(ii) a The 12 schemes of water outlet flow channel data are relative values taking the diameter D of the water pump impeller as a reference value, wherein:

the No. 1 scheme is SC13, the width of the corresponding runner outlet section is 2.3D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the outlet runner diffusion section is listed in Table 3; the No. 2 scheme is SC14, the width of the corresponding runner outlet section is 2.3D, the nominal average flow rate of the water pump is 3.0m/s, and the section data of the outlet runner diffusion section is listed in Table 4; the No. 3 scheme is SC22, the corresponding cross section width of the outlet of the flow channel is 2.4D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffusion section of the water outlet flow channel are listed in Table 5; the No. 4 scheme is SC23, the corresponding cross section width of the outlet of the flow channel is 2.4D, the nominal average flow velocity of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet flow channel are listed in Table 6; the No. 5 scheme is SC32, the corresponding cross section width of the outlet of the runner is 2.5D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 7; the number of the 6 th scheme is SC33, the width of the corresponding runner outlet section is 2.5D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the outlet runner diffusion section is listed in Table 8; the 7 th scheme is numbered as SC41, the width of the corresponding runner outlet section is 2.6D, the nominal average flow speed of the water pump is 4.5m/s, and the section data of the outlet runner diffusion section is listed in Table 9; the 8 th scheme is numbered as SC42, the width of the corresponding runner outlet section is 2.6D, the nominal average flow rate of the water pump is 4.0m/s, and the section data of the outlet runner diffusion section is listed in Table 10; the 9 th scheme is numbered as SC43, the corresponding cross section width of the outlet of the flow channel is 2.6D, the nominal average flow velocity of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet flow channel are listed in Table 11; the No. 10 scheme is SC51, the corresponding cross section width of the outlet of the runner is 2.7D, the nominal average flow velocity of the water pump is 4.5m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 12; the 11 th scheme is numbered as SC52, the corresponding cross section width of the outlet of the runner is 2.7D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffuser section are listed in Table 13; the 12 th scheme is numbered as SC53, the width of the corresponding runner outlet section is 2.7D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the outlet runner diffusion section is listed in Table 14; the flow channel head loss delta h is less than 0.15m when the flow is designed for the water outlet flow channels of the 12 schemes;

(2) determining the width B of the water flow channel outlet section according to the unit center distance of the pump station to be applied and the determined width of the water inlet flow channel inlet section_cIs a suitable value;

(3) calculating the nominal average flow speed of the water pump according to the following formula according to the design flow of the single pump of the pump station and the diameter of the impeller of the water pump:

in the formula (I), the compound is shown in the specification,-nominal average flow rate of the water pump, m/s;

q- -design flow of Single Pump, m³/s；

D-water pump impeller diameter, m;

(4) selecting the number of the corresponding outlet flow channel scheme in the table 1 according to the determined outlet cross section width of the outlet flow channel of the pump station and the nominal average flow rate of the water pump;

(5) according to the serial number of the selected effluent channel scheme, finding a corresponding channel elevation map and a section position line and a section data table in a series of effluent channels consisting of 12 schemes;

(6) multiplying the relative values of the geometric sizes of the flow channel elevation map found in the step (5), including the section position line, the plan map, the section position line and the section data table by the diameter D of the water pump impeller to be adopted by the pump station for conversion to obtain the actual required size of the water outlet flow channel of the pump station;

(7) the bottom edge of the serial water outlet flow channel diffusion section is flat, and according to the actual requirement of the arrangement of the pump station water outlet pool wing wall, the bottom edge of the water outlet flow channel diffusion section converted in the step (6) can be properly lifted up under the condition that the height of the outlet section of the diffusion section and the size of the flow channel plane are not changed;

(8) the length L of the gate section of the series of water outlet flow channels_zm2.2D, according to the actual requirement of the upper structure arrangement of the pump station, the length L of the gate section converted in the step (6)_zmAdjusting the length L of the gate segment_zmThe width and the height of the gate section are kept unchanged;

(9) the serial water outlet flow channels are not provided with middle separation piers, and the middle separation piers with proper sizes can be additionally arranged in the water outlet flow channels according to the requirements of the pump house of the pump station and the structural design of the gate;

(10) and drawing a water outlet flow channel single line diagram which can be adopted by pump station engineering design in CAD drawing software according to the converted and adjusted actual geometric dimension of the water outlet flow channel.

Technical Field

The invention belongs to the technical field of hydraulic engineering pump stations, and particularly relates to a series of water outlet runners applied to a front-located shaft type tubular pump device and an application method thereof, which are mainly used for ensuring the hydraulic design quality of the water outlet runners of the front-located shaft type tubular pump device of a large and medium-sized pump station.

Background

The front-located shaft type tubular pump device has the advantages of excellent hydraulic performance, simple structure, better ventilation and heat dissipation conditions of the motor, more convenient installation and maintenance, less investment and the like, and is widely applied to large and medium-sized low-lift pump stations with the net lift of less than 3m in nearly 10 years. The outlet flow passage of the front shaft type tubular pump device has the function of guiding water flow to be smoothly diffused in the process of flowing from the outlet of the guide vane body of the water pump to the outlet pool so as to recover water flow energy as much as possible, reduce the water head loss of the outlet flow passage and improve the efficiency of the pump device. For large and medium-sized low-lift pump stations with the net lift below 3m, the proportion of the water outlet runner head loss relative to the net lift of the pump station is large, so that the design of the water outlet runner with excellent hydraulic performance is a necessary condition for obtaining higher pump device efficiency. The application range of the front vertical well type tubular pump device is large, the difference between the lift and the flow of an applied pump station is large, the difference between the diameters of impeller and the size of a flow passage of the water pump is large, and various different combinations exist between the width of the cross section of an outlet of a water outlet flow passage and the nominal average flow velocity of the water pump. Meanwhile, the difference of the degree of the designers of various design houses mastering the hydraulic design method of the water outlet flow channel of the front-located shaft type tubular pump device is large, so that the efficiency of the water outlet flow channel of some pump stations and the efficiency of the pump device are low, the difference is large compared with the high level to be reached, and the safety, stability and high-efficiency operation of the pump stations are influenced to different degrees.

Disclosure of Invention

The invention aims to solve the problems in the engineering application of the front-located shaft type tubular pump device, and performs statistics and analysis on main hydraulic design parameters and geometric dimensions of ten established pump stations; determining main hydraulic design parameters and the value range of the geometric dimension of the outlet flow channel of the front-located shaft type tubular pump device according to the statistical and analysis results, and providing key hydraulic design parameters of the hydraulic design of the outlet flow channel of the front-located shaft type tubular pump device; on the premise of meeting the actual requirements of engineering application and not exceeding various grading schemes, the hydraulic design series schemes of the water outlet flow channel are reasonably graded to obtain 12 schemes of hydraulic design seriation of the water outlet flow channel; the 12 schemes are subjected to optimization hydraulic design research of runner molded lines one by one, so that the hydraulic performance of the runner molded lines is optimal. The series of water inlet flow passages formed by the 12 schemes not only has excellent hydraulic performance, convenient application, strong adaptability and wide coverage, but also can be suitable for various combination conditions of different water outlet flow passage outlet section widths and different water pump nominal average flow rates, and has important significance for ensuring the hydraulic design level of the water outlet flow passage of the low-lift pump station prepositive vertical shaft type tubular pump device with large area and large capacity and realizing the goal of stable and efficient operation of the pump station.

The first purpose of the invention is realized by the following technical scheme:

the geometric dimension of the water outlet flow passage of the front-located shaft type tubular pump device is represented by a relative value taking the diameter D of a water pump impeller as a reference value; dividing a water outlet flow channel of the front-located shaft type tubular pump device into a circular platform section, a diffusion section and a gate section; the shape characteristics of the circular table section: the section shape is round, and the generatrix is a linear diffusion-shaped circular table; the shape characteristics of the diffusion section are as follows: the shape of the cross section is gradually changed from round to rectangle, and the area of the cross section is gradually enlarged; the physical characteristics of the gate section: the molded lines of the plane and the vertical surface of the runner are both straight lines, and the section of the runner is rectangular; the circular truncated cone section receives water flow with a high flow rate flowing out of the guide vane body, the water flow enters the diffusion section after preliminary diffusion and deceleration, the water flow is fully diffused and decelerated in the diffusion section along with the gradual expansion of the cross section area of the flow channel, and finally flows smoothly into the gate section at a low flow rate and flows into the water outlet pool through the gate section; the gate section is used for arranging a working gate and an accident gate;

counting hydraulic design parameters and geometric dimensions of dozens of built pump stations, and determining the parameters according to the counting and analyzing resultsSetting main hydraulic design parameters and the value range of the geometric dimension of the water outlet flow passage of the shaft tubular pump device, providing key hydraulic design parameters of the hydraulic design of the water outlet flow passage of the front shaft tubular pump device, selecting the width of the outlet section of the water outlet flow passage and the nominal average flow speed of the water pump as two key parameters of the water outlet flow passage of the series of the front shaft tubular pump device, and determining the diameter D of the inlet section of the circular platform section_yjIs 1.052D, length L of the truncated cone section_ytIs 0.5D and the diameter D of the outlet section of the circular table section_yc1.156D, planar diffusion Angle θ of the diffuser section_pmIs 17 degrees, the length L of the gate section_zmIs 2.2D;

the relative value of the height of the cross section of the outlet of the runner is obtained by calculation according to the nominal average flow speed of the water pump, the flow speed control requirement of the cross section of the outlet of the runner and the relative value of the width of the cross section of the outlet; on the premise of meeting the practical requirements of engineering application and having no more than various grading schemes, the width B of the outlet section of the water outlet flow channel is adjusted within a common range_cDividing the nominal average flow speed of the water pump into 2.3D, 2.4D, 2.5D, 2.6D and 2.7D 5 grades, and dividing the nominal average flow speed of the water pump into 3.0m/s, 3.5m/s, 4.0m/s and 4.5m/s 4 grades; combining the width of the section of the outlet with the 5 th grade and the nominal average flow rate of the water pump with the 4 th grade two by two to obtain 20 combination schemes of the water outlet flow channel; in 20 combination schemes of the water outlet flow passage, the vertical surface diffusion angle theta of the diffusion section is adopted_lmNot less than 0 and a diffusion section equivalent diffusion angle theta_dlRejecting unqualified schemes according to the requirement of less than or equal to 12 degrees to obtain 12 effluent channel combination schemes meeting the basic requirements of effluent channels of the front-located shaft type tubular pump device, wherein the combination modes and corresponding numbers of the 12 effluent channel schemes are shown in table 1; then calculating the height H of the outlet section of the water outlet flow passage meeting the requirements of 12 schemes_cSee table 2;

TABLE 1 numbering of series outlet flow channel schemes corresponding to 12 combinations of flow channel outlet section width and nominal average water pump flow velocity

Table 212 outlet section height of outlet flow passage

Further, under the condition that the average flow velocity of the outlet section of the water outlet channel meets the requirement, the optimization hydraulic design of the channel profile is respectively carried out on the 12 combined schemes of the water outlet channel (the optimization calculation method is shown in a three-dimensional body flow surface design method of the water outlet channel of the high-performance large-flow pump station, a patent number is ZL201610018693.6, of Chinese invention patent applied to 2016, 5, 25 and 25 th of Yangzhou university), so that the hydraulic performance of each water outlet channel scheme is optimized, and finally the series water outlet channels of the front vertical shaft type tubular pump device consisting of the 12 schemes are obtained.

Furthermore, the three-dimensional body of 12 schemes of the water outlet flow passage of the preposed shaft type tubular pump device series provides a section position diagram of the flow passage diffusion section and a corresponding section data table, and the data in the section data table comprises the section number of the flow passage diffusion section and the edge line coordinate (X) on the longitudinal section₁，Y₁) Longitudinal section lower line coordinate (X)₂，Y₂) Height of cross section H_wWidth of cross section B_wAnd the radius R of a transition circle with the cross section shape gradually changed from a circle to a rectangle_w(ii) a The 12 schemes of water outlet flow channel data are relative values taking the diameter D of the water pump impeller as a reference value, wherein:

the No. 1 scheme is SC13, the width of the corresponding runner outlet section is 2.3D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the water outlet runner diffusion section is listed in Table 3;

the No. 2 scheme is SC14, the width of the corresponding runner outlet section is 2.3D, the nominal average flow rate of the water pump is 3.0m/s, and the section data of the outlet runner diffusion section is listed in Table 4;

the No. 3 scheme is SC22, the corresponding cross section width of the outlet of the runner is 2.4D, the nominal average flow rate of the water pump is 4.0m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 5;

the No. 4 scheme is SC23, the corresponding cross section width of the outlet of the runner is 2.4D, the nominal average flow rate of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 6;

the No. 5 scheme is SC32, the corresponding cross section width of the outlet of the runner is 2.5D, the nominal average flow rate of the water pump is 4.0m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 7;

the number of the 6 th scheme is SC33, the width of the corresponding runner outlet section is 2.5D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the water outlet runner diffusion section is listed in Table 8;

the 7 th scheme is numbered as SC41, the width of the corresponding runner outlet section is 2.6D, the nominal average flow rate of the water pump is 4.5m/s, and the section data of the outlet runner diffusion section is listed in Table 9;

the 8 th scheme is numbered as SC42, the width of the corresponding runner outlet section is 2.6D, the nominal average flow rate of the water pump is 4.0m/s, and the section data of the water outlet runner diffusion section is listed in Table 10;

the 9 th scheme is numbered as SC43, the width of the corresponding runner outlet section is 2.6D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the outlet runner diffusion section is listed in Table 11;

the No. 10 scheme is SC51, the corresponding cross section width of the outlet of the runner is 2.7D, the nominal average flow velocity of the water pump is 4.5m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 12;

the 11 th scheme is numbered as SC52, the corresponding cross section width of the outlet of the runner is 2.7D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffuser section are listed in Table 13;

the 12 th scheme is numbered as SC53, the width of the corresponding runner outlet section is 2.7D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the outlet runner diffusion section is listed in Table 14;

the flow channel head loss delta h is less than 0.15m when the flow is designed for the water outlet flow channels of the 12 schemes;

TABLE 3 Outlet flow passage diffuser section data sheet with scheme number SC13

TABLE 4 Outlet flow passage diffuser section data sheet with scheme number SC14

TABLE 5 Outlet flow passage diffuser section data sheet with scheme number SC22

TABLE 6 Outlet flow passage diffuser section data sheet with scheme number SC23

TABLE 7 Outlet flow passage diffuser section data sheet with scheme number SC32

TABLE 8 Outlet flow passage diffuser section data sheet with scheme number SC33

TABLE 9 Outlet flow passage diffuser section data sheet with scheme number SC41

TABLE 10 Outlet flow passage diffuser section data sheet with scheme number SC42

TABLE 11 Outlet flow passage diffuser section data sheet with scheme number SC43

TABLE 12 Outlet flow passage diffuser section data sheet with scheme number SC51

TABLE 13 Outlet flow passage diffuser section data sheet with scheme number SC52

TABLE 14 Outlet flow passage diffuser section data sheet with plan number SC53

The second purpose of the invention is realized by the following technical scheme, and the application method of the series water outlet flow channel with excellent hydraulic performance further comprises the following steps on the basis of the scheme:

(1) determining the width B of the section of the outlet of the water flow channel according to the center distance of the unit of the pump station to be applied and the determined width of the section of the inlet of the water inlet flow channel_cIs a suitable value;

(2) calculating the name-mean average flow rate of the water pump according to the designed flow of the single pump of the pump station and the diameter of the impeller of the water pump and the following formula:

in the formula (I), the compound is shown in the specification,-nominal average flow rate of the water pump, m/s;

q- -design flow of Single Pump, m³/s；

D-water pump impeller diameter, m;

(3) selecting the number of the corresponding outlet flow channel scheme in the table 1 according to the determined outlet cross section width of the outlet flow channel of the pump station and the nominal average flow rate of the water pump;

(4) according to the serial number of the selected effluent channel scheme, finding a corresponding flow channel elevation map (containing a section position line), a plane map (containing a section position line) and a section data table in the series of effluent channels;

(5) multiplying the relative values of the geometric sizes in the flow channel elevation (including the section position line), the plane diagram (including the section position line) and the section data table found in the step (5) by the diameter D of the water pump impeller to be adopted by the pump station for conversion to obtain the actual required size of the water outlet flow channel of the pump station;

(6) the bottom edge of the serial water outlet flow channel diffusion section is flat, and according to the actual requirement of the pump station water outlet pool wing wall arrangement, the bottom edge of the water outlet flow channel diffusion section converted in the step (5) can be lifted up properly under the condition that the height of the section of the outlet of the diffusion section and the size of the plane of the flow channel are not changed;

(7) what is needed isLength L of gate section of said series water outlet flow passage_zm2.2D, the length L of the gate section converted in the step (5) can be adjusted according to the actual requirement of the upper structure arrangement of the pump station_zmAdjusting the length L of the gate section_zmThe width and the height of the gate section are kept unchanged;

(8) the serial water outlet flow channels are not provided with middle separation piers, and the middle separation piers with proper sizes can be additionally arranged in the water outlet flow channels according to the requirements of the pump house of the pump station and the structural design of the gate;

(9) and drawing a water outlet flow channel single line diagram which can be adopted by pump station engineering design in CAD drawing software according to the converted and adjusted actual geometric dimension of the water outlet flow channel.

The invention provides a section position diagram and a section data table of 12 schemes of a series water outlet flow passage of a front shaft type tubular pump device; and determining a proper outlet flow channel scheme in the provided series of outlet flow channel schemes according to the outlet section width of the outlet flow channel of the pump station and the nominal average flow rate of the water pump. Compared with the prior art, the invention has the following beneficial effects:

firstly, the series of water outlet flow passages formed by 12 schemes provided by the invention has strong adaptability and wide application range, and can be suitable for various combination conditions of different water outlet flow passage outlet section widths and different water pump nominal average flow rates; all the sizes of the series water outlet flow passages of the preposed shaft type tubular pump device are expressed by relative values, and the actually required flow passage size can be obtained by multiplying the relative values by the diameter D of the water pump impeller; the inclination angle of the bottom edge of the diffusion section, the length of the gate section and the partition pier can be adjusted as necessary according to the actual needs of the pump station;

secondly, through the research of the optimized hydraulic design of the system, the series of water outlet channels consisting of 12 schemes provided by the invention have excellent hydraulic performance, and the channel head loss delta h is less than 0.15m when the flow is designed;

thirdly, the application method of the series water outlet flow passage consisting of the 12 schemes provided by the invention is simple, is convenient for the majority of engineering technicians to adopt, avoids a great deal of repeated research work such as optimized hydraulic design calculation and model test on the water outlet flow passage of the front-located shaft type tubular pump device, improves the engineering design quality, shortens the design work period, and has important significance for ensuring the high quality of the hydraulic design of the water outlet flow passage of the front-located shaft type tubular pump device and the safe, stable and efficient operation of a pump station.

Drawings

FIG. 1(a) is a schematic view of the dimensions of the vertical surface of the outlet channel provided by the present invention;

FIG. 1(b) is a schematic view of the dimension of the outlet channel in the plane of the outlet channel provided by the present invention;

FIG. 1(c) is A in FIG. 1(a) and FIG. 1(b)_i—A_iA cross-sectional view;

FIG. 2(a) is a sectional view of a water outlet channel according to the present invention;

FIG. 2(b) is a sectional view of the outlet channel (plan view) according to the present invention;

FIG. 3(a) is a schematic view of the bottom edge of the diffuser section of the outlet flow channel raised (in elevation);

FIG. 3(b) is a schematic view (plan view) of the bottom edge of the diffuser section of the outlet flow channel;

FIG. 4(a) is a schematic view (elevation) illustrating the adjustment of the length of the gate section of the outlet channel;

FIG. 4(b) is a schematic view (plan view) of the adjustment of the length of the gate section of the outlet channel;

FIG. 5(a) is a schematic view (elevation view) of a middle partition pier additionally arranged in a water outlet runner;

FIG. 5(b) is a schematic view (plan view) of the middle partition pier additionally arranged in the water outlet runner;

FIG. 6(a) is a single line diagram (elevation view) of the outlet flow path after conversion and adjustment;

FIG. 6(b) is a single line diagram (plan view) of the converted and adjusted outlet flow path;

in the figure: 1 round platform section, 2 diffuser segments, 3 gate segments, 4 longitudinal section upper side lines, 5 longitudinal section lower side lines, 6 plane width side lines, 7 transition circle center track lines with the section shape gradually changed from a circle to a rectangle, and 8 middle partition piers.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

1. the technical scheme of the invention;

(1) the geometric dimension of the water outlet flow channel of the front-located shaft type tubular pump device is represented by a relative value taking the diameter D of a water pump impeller as a reference value;

(2) dividing a water outlet flow channel of the front-located shaft type tubular pump device into a circular platform section 1, a diffusion section 2 and a gate section 3, as shown in figures 1a and 1 b;

(3) determining the diameter D of the inlet section of the circular platform section 1 according to design experience and statistical results_yjIs 1.052D, the length L of the round section 1_ytIs 0.5D and the diameter D of the outlet section of the circular truncated cone section 1_yc1.156D, planar diffusion Angle θ of diffuser 2_pmIs 17 DEG, the length L of the gate section 3_zmIs 2.2D; calculating the relative value of the height of the cross section of the outlet of the flow channel according to the nominal average flow speed of the water pump, the flow speed control requirement of the cross section of the outlet of the flow channel and the relative value of the width of the cross section of the outlet;

(4) according to the statistical result, in the common range, the outlet section width B of the water outlet flow passage_cDividing the nominal average flow speed of the water pump into 2.3D, 2.4D, 2.5D, 2.6D and 2.7D 5 grades, and dividing the nominal average flow speed of the water pump into 3.0m/s, 3.5m/s, 4.0m/s and 4.5m/s 4 grades; combining the width of the section of the outlet with the 5 th grade and the nominal average flow rate of the water pump with the 4 th grade two by two to obtain 20 combination schemes of the water outlet flow channel;

(5) in 20 combination schemes of the water outlet flow passage, the vertical surface diffusion angle theta of the diffusion section is adopted_lmNot less than 0 and a diffusion section equivalent diffusion angle theta_dlRejecting unqualified schemes with the requirement of less than or equal to 12 degrees to obtain 12 water outlet flow channel combination schemes (see table 1) meeting the requirement of the water outlet flow channel of the front-located shaft type tubular pump device, wherein the height H of the section of the outlet of the water outlet flow channel of the 12 schemes_cSee table 2;

(6) respectively carrying out special optimization hydraulic design research on an upper side line 4 of a longitudinal section, a lower side line 5 of the longitudinal section, a plane width side line 6 and a central track line 7 of a transition circle of which the section shape is changed from a circle to a rectangle gradually under the condition that the average flow velocity of the outlet section of the water outlet flow passage meets the requirement, so that the hydraulic performance of the upper side line, the lower side line, the plane width side line and the central track line is optimal, and the serial water inlet flow passages formed by 12 schemes are obtained;

(7) the diffusion section 2 of the series of water outlet flow channels provides detailed section positions and section data;

(8) selecting the number of a corresponding outlet flow channel scheme in a series of outlet flow channels according to the outlet section width of the outlet flow channel of the pump station and the nominal average flow speed of the water pump to be applied;

(9) multiplying the relative value of each geometric dimension of the corresponding numbered water outlet flow channel scheme by the diameter D of a water pump impeller to be adopted by the pump station to obtain the actual required dimension of the water outlet flow channel of the pump station;

(10) the parameters of the diffusion section 2 and the gate section 3 of the corresponding numbered water outlet flow channel scheme can be adjusted within a certain range according to the actual needs of the pump station;

2. the series of water outlet flow channels have excellent hydraulic performance;

(1) according to the actual application requirement of the water outlet flow channel, the water outlet flow channel is obtained through special optimization hydraulic design research;

(2) the main hydraulic performance indexes are as follows: the flow passage head loss delta h is less than 0.15m when the flow is designed.

3. The expression mode of the geometric shape of the series of water outlet flow channels is provided;

(1) dividing a water outlet flow channel of the front-located shaft type tubular pump device into a circular platform section 1, a diffusion section 2 and a gate section 3, as shown in a figure 1(a) and a figure 1 (b);

(2) the diffusion section 2 is a core part of a water outlet flow channel design and has the function of enabling water flow to be diffused smoothly, the width of the flow channel of the section is increased gradually, meanwhile, the shape of the cross section is changed from a circular cross section of an inlet to a rectangular cross section of an outlet, and an upper side line 4 of a longitudinal section, a lower side line 5 of the longitudinal section and a plane width side line 6 of the diffusion section 2 start from the outlet cross section of the circular truncated cone section 1 and end at the inlet cross section of the gate section 3; in order to accurately express the three-dimensional shape of the segment, a cross-sectional position diagram of the diffuser segment 2, which is shown in fig. 2a and 2b, and a cross-sectional data table, in which data including the coordinates (X) of the borderline 4 on the longitudinal section of the diffuser segment 2, are provided₁， Y₁) The coordinate (X) of the lower edge line 5 of the longitudinal section₂，Y₂) Height of cross section H_wWidth of cross section B_wRadius of cross-section transition circle R_wThe cross section of the flow channel is shown in figure 1 c;

(3) the circular platform section 1 is positioned in front of the inlet section of the diffusion section 2 and is a transition section between the guide vane body of the water pump and the diffusion section 2; the section of the circular platform section 1 is circular, and the circular platform section is used for receiving water flow with high flow rate flowing out of the water pump guide vane body, and the water flow enters the diffusion section 2 after preliminary diffusion and deceleration; the geometric parameters of the circular platform section 1 comprise the diameter D of the inlet section_yjLength L of_ytDiameter D of outlet cross section_ycAs shown in fig. 1(a) and 1 (b);

(4) the gate section 3 is positioned behind the outlet section of the diffusion section 2, the gate section 3 is used for arranging a working gate and an accident gate, the plane and vertical molded lines of the gate section 3 are both straight lines, and the section of the flow channel is rectangular; the geometric parameters of the gate segments 3 include the length L_zmHeight H of section of outlet of flow passage_cAnd the width B of the cross section of the outlet of the flow channel_cAs shown in FIGS. 1(a) and 1 (b);

(5) the series of water outlet flow passages are divided into 12 schemes, and the geometric dimensions of the series of water outlet flow passages are relative values taking the diameter D of a water pump impeller as a reference value; wherein: the No. 1 scheme is SC13, the corresponding cross section width of the outlet of the runner is 2.3D, the nominal average flow velocity of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 3; the No. 2 scheme is SC14, the width of the corresponding runner outlet section is 2.3D, the nominal average flow rate of the water pump is 3.0m/s, and the section data of the outlet runner diffusion section is listed in Table 4; the 3 rd scheme is numbered as SC22, the width of the corresponding runner outlet section is 2.4D, the nominal average flow rate of the water pump is 4.0m/s, and the section data of the water outlet runner diffusion section is listed in Table 5; the No. 4 scheme is SC23, the corresponding cross section width of the outlet of the flow channel is 2.4D, the nominal average flow velocity of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet flow channel are listed in Table 6; the No. 5 scheme is SC32, the corresponding cross section width of the outlet of the runner is 2.5D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 7; the number of the 6 th scheme is SC33, the corresponding cross section width of the outlet of the flow channel is 2.5D, the nominal average flow velocity of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet flow channel is listed in Table 8; the 7 th scheme is numbered as SC41, the width of the corresponding runner outlet section is 2.6D, the nominal average flow speed of the water pump is 4.5m/s, and the section data of the outlet runner diffusion section is listed in Table 9; the 8 th scheme is numbered as SC42, the width of the corresponding runner outlet section is 2.6D, the nominal average flow rate of the water pump is 4.0m/s, and the section data of the outlet runner diffusion section is listed in Table 10; the 9 th scheme is numbered as SC43, the width of the corresponding runner outlet section is 2.6D, the nominal average flow rate of the water pump is 3.5m/s, and the section data of the water outlet runner diffusion section are listed in Table 11; the No. 10 scheme is SC51, the corresponding cross section width of the outlet of the runner is 2.7D, the nominal average flow velocity of the water pump is 4.5m/s, and the cross section data of the diffusion section of the water outlet runner are listed in Table 12; the 11 th scheme is numbered as SC52, the corresponding cross section width of the outlet of the runner is 2.7D, the nominal average flow velocity of the water pump is 4.0m/s, and the cross section data of the diffusion section is listed in Table 13; the 12 th scheme is numbered as SC53, the corresponding cross section width of the outlet of the flow channel is 2.7D, the nominal average flow velocity of the water pump is 3.5m/s, and the cross section data of the diffusion section of the water outlet flow channel are listed in Table 14;

4. application method of serial water outlet flow channel;

(1) selecting the number of a corresponding outlet flow channel scheme in the table 1 according to the outlet section width of the outlet flow channel of the pump station to be applied and the nominal average flow speed of the water pump;

(2) according to the number of the selected effluent channel scheme, finding out an elevation map (containing a section position line), a plan map (containing a section position line) and a section data table of the corresponding effluent channel scheme in the series of effluent channels;

(3) multiplying the relative values of the geometric sizes of the effluent channel elevation map (including the position line of the section), the plan map (including the position line of the section) and the section data table found in the step (2) by the diameter D of the impeller of the water pump to be adopted by the pump station for conversion to obtain the actual required size of the effluent channel of the pump station;

(4) according to the actual situation of the arrangement of the water outlet pool wing walls of the pump station, under the condition that the outlet section height and the flow channel plane size of the water outlet flow channel diffusion section 2 corresponding to the numbering scheme are kept unchanged, the bottom edge of the diffusion section 2 can be lifted properly on the basis of the existing size;

(5) according to the actual need of the pump station upper structure arrangement, the length L of the water outlet flow passage gate section 3 corresponding to the numbering scheme_zmCan be increased or decreased on the basis of the existing size; adjusting the length L of the gate section 3_zmThe width and height of the gate section 3 are kept unchanged;

(6) according to the requirements of the pump station pump room and the gate structure design, a middle partition pier 8 with a proper size can be additionally arranged in the water outlet flow channel corresponding to the numbering scheme;

(7) and (4) drawing a water outlet flow channel single line diagram which can be adopted by the pump station engineering design in CAD drawing software according to the actual geometric dimension of the water outlet flow channel which is converted in the step (3) and adjusted in the steps (4), (5) and (6).