Water weir measurement pump performance test device, test method and construction method

Abstract

The invention belongs to the technical field of pump performance detection, and provides a weir measurement pump performance test device, a test method and a construction method.The test device comprises a water inlet pool, a water outlet pool, a vertical pump, a first measurement channel and a plurality of second measurement channels; the inlet end of the first measuring channel is communicated with the water inlet tank, the outlet end is communicated with the water outlet tank, and a horizontal pump is mounted in the first measuring channel; the n second measuring channels are arranged in parallel, the inlet ends of the second measuring channels are communicated with the water outlet tank, the outlet ends are communicated with the water inlet tank, and n > = 2; the vertical pump is installed at the inlet end of the second measuring channel. According to the test device, the first test channel and the plurality of second test channels are adopted, and when a pump performance test is carried out, water flow can be introduced into one or more test channels according to the flow of the pump, so that the test range of the test device is enlarged, and the ultra-large-flow low-lift pump can be measured.

Description

Technical Field

[0001] The present invention belongs to the technical field of pump performance detection, and in particular relates to a water weir pump performance measurement test device, a test method and a construction method. Background Art

[0002] There are many ways to measure pump flow, especially with the development of electronic technology, a large number of new technologies and products such as electromagnetic flowmeters and ultrasonic flowmeters have been applied to the field of pump testing technology. However, these flow measurement methods have limitations in scale. For some large flow and ultra-large flow pumps, especially in the water conservancy industry, the pump flow is particularly large, reaching tens of tons per second or even more. It is impossible to use these flow meters usually installed on pipelines to measure the flow of the pump. The water weir method is a method based on the basic principles of fluid mechanics, which calculates the flow of the fluid by measuring the head of the water flowing through a specific device.

[0003] The water weir method has been widely used in the measurement of water conservancy projects such as channels, reservoirs, canals and flood drainage ditches. However, in large pump manufacturing companies, there are relatively few test devices for measuring such large water pumps, especially since such pump test devices occupy a large area and require a lot of investment. The existing water weir method measurement devices have a limited applicable measurement range and low measurement accuracy. In addition, the existing water weir method measurement devices have a large liquid level difference and flow resistance at the inlet and outlet of the test pump, and cannot measure some ultra-large flow and low-head pumps. Summary of the invention

[0004] In order to solve the problems in the background technology, the present invention proposes a water weir measuring pump performance test device, a test method and a construction method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A water weir measuring pump performance test device comprises a water inlet pool, a water outlet pool, a vertical pump, a first measuring channel, a weir and a plurality of second measuring channels; The inlet end of the first measuring channel is connected to the water inlet pool, the outlet end is connected to the water outlet pool, and a horizontal pump is installed in the first measuring channel; n second measurement channels are arranged in parallel, and the inlet end of the second measurement channel is connected to the water outlet pool, and the outlet end is connected to the water inlet pool, and n≥2; The vertical pump is installed at one side of the inlet end of the second measuring channel, and is used to draw water from the water inlet pool and transport it to the corresponding second measuring channel; A third gate is installed at the inlet end of each of the second measuring channels, and the third gate is located on one side of the vertical pump; The weir is installed at the outlet end of the second measurement channel.

[0006] Preferably, the first measuring channel further includes an inlet flow channel, a first gate, a first reducing flange, a second reducing flange, a second gate and an outlet flow channel; Along the water flow direction, the water inlet flow channel, the first gate, the first reducing flange, the horizontal pump, the second reducing flange, the second gate and the outlet flow channel are connected in sequence.

[0007] Preferably, along the water flow direction: The water inlet channel is a tapered structure; The outlet flow channel is a diffusion structure.

[0008] Preferably, the second measuring channel is a weir; Along the first direction, the vertical pump is installed at the inlet end of the weir groove, and the weir groove is a linear structure; Along a second direction perpendicular to the first direction, the third gate is installed at the end of the groove wall of the first weir groove closest to the water outlet pool, and the first weir groove is the weir groove closest to the water outlet pool; Along the second direction, adjacent weir grooves share a groove wall, and the third gate is installed at the end of the shared groove wall.

[0009] Preferably, the bottom plate of the weir groove is installed with a weir plate and a rectifying grid; The weir plate is installed on the bottom plate at the outlet end of the weir groove, and the two ends of the weir plate are respectively against the groove wall of the weir groove; The weir plate is the weir of the second measuring channel, and the area above the top of the weir plate is the upper weir; The rectifying grid is mounted on the bottom plate at the inlet end of the weir.

[0010] Preferably, the vertical pump is provided with an extraction pipe and a discharge pipe; The extraction pipe is located in the water inlet pool, and the discharge pipe is located at one side of the inlet end of the second measuring channel.

[0011] Preferably, the water inlet tank is also connected to a regulating water tank.

[0012] Preferably, two second measuring channels are provided.

[0013] A water weir measuring pump performance test method, applied to the above-mentioned water weir measuring pump performance test device, comprises the following steps: The first measuring channel, the water outlet pool and the m second measuring channels are kept connected, and the flow rate of the horizontal pump is tested by the liquid level heights of the m second measuring channels, where n≥m≥1; Or, the first measuring channel is closed and the adjacent second measuring channel is isolated by a third gate, water from the water inlet pool is pumped out by a single vertical pump and delivered to a single second measuring channel, and then the flow rate of the single vertical pump is measured by the liquid level height of the single second measuring channel; Alternatively, close the first measuring channel and control the third gate to connect the k second measuring channels, draw water from the water inlet pool through a single vertical pump and deliver it to the k second measuring channels, and then measure the flow rate of the single vertical pump through the liquid level heights of the k second measuring channels, n≥k≥1.

[0014] Preferably, the flow rate formula is as follows: Q=C d ×2 / 3×(2×g) 1 / 2 ×b×h 3 / 2 ; In the formula, the flow coefficient C d =0.602+0.075×h / E; h is the water head on the weir of the second measuring channel, in m; E is the height of the weir of the second measuring channel; g is the acceleration of gravity; b is the width of the weir used.

[0015] Preferably: when the flow rate of the horizontal pump is 15.3m 3 / s≤Q≤30.6m 3 / s, m=2; When the flow rate of the horizontal pump is 3.05m 3 / s≤Q≤15.3m 3 / s, m=1; When the flow rate of the vertical pump is 3.05m 3 / s≤Q≤15.3m 3 / s, k=1; When the flow rate of the vertical pump is 15.3m 3 / s≤Q≤30.6m 3 / s, k=2.

[0016] A construction method for the above-mentioned weir pump performance test device comprises the following steps: Setting the maximum flow rate of the pump to be tested and the design water head of the weir, wherein the pump to be tested is a horizontal pump or a vertical pump; Calculate the width of the weir based on the maximum flow of the pump to be tested and the design head of the weir; The number of second measurement channels and the length of the second measurement channels are set based on the width of the weir.

[0017] Preferably, the width of the weir is calculated based on the maximum flow of the pump to be tested and the design water head of the weir to satisfy: Q 设定 =C d ×2 / 3×(2×g)1 / 2 ×b1×h 设定 3 / 2 ; In the formula, the flow coefficient Cd = 0.602 + 0.075 × h 设定 / E;h 设定 is the water head on the weir of the second measurement channel, E is the height of the weir of the second measurement channel; g is the acceleration of gravity; b1 is the width of the weir during measurement; Q 设定 is the maximum flow rate of the pump to be tested.

[0018] Preferably, the length of the second measurement channel is greater than ten times the weir width.

[0019] Beneficial effects of the present invention: 1. The present invention adopts a first test channel and multiple second test channels. When conducting a pump performance test, water flow can be introduced into one or more test channels according to the flow rate of the pump, thereby increasing the test range of the test device and being able to measure pumps with ultra-large flow and low head; 2. The test method of the present invention arranges parallel weirs and troughs above a connected water reservoir (water inlet tank + regulating tank), and through a combined design with a gate, the test device can be used to test horizontal pumps and vertical pumps, which expands the use of the test device, greatly reduces the floor space of the test device, and also reduces the amount of earth excavation, thereby reducing the construction cost of the test device.

[0020] 3. The single and double weir measurement modes designed by the construction method of the present invention broaden the flow range of the pump test, and at the same time, the single and double weirs are reasonably distributed through calculation, so that the test results are more accurate.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A top view of a water weir measuring pump performance test device of the present invention is shown; Figure 2It shows a structural diagram below the weir groove of a water weir measuring pump performance test device of the present invention; Figure 3 A flow chart showing a water weir measuring pump performance test method of the present invention; Figure 4 A flow chart of a construction method of the present invention is shown.

[0024] In the figure: 1, water inlet pool; 2, water inlet flow channel; 3, first gate; 4, first reducing flange; 5, horizontal pump; 6, second reducing flange; 7, second gate; 8, outlet flow channel; 9, water outlet pool; 10, third gate; 11, weir plate; 12, vertical pump; 1201, extraction pipe; 1202, discharge pipe; 13, regulating pool; 14, rectifying grid; 15, weir trough. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] A test device for measuring the performance of a pump in a water weir comprises a water inlet pool 1, a water outlet pool 9, a vertical pump 12, a first measuring channel, a weir and a plurality of second measuring channels.

[0027] The inlet end of the first measuring channel is connected to the water inlet pool 1, and the outlet end is connected to the water outlet pool 9, and a horizontal pump 5 is installed in the channel. There are n second measuring channels (n≥2), and they are arranged in parallel. The inlet end of each second measuring channel is connected to the water outlet pool 9, and the outlet end is connected to the water inlet pool 1. The vertical pump 12 is arranged on one side of the inlet end of the second measuring channel, and its function is to extract water from the water inlet pool 1 and transport the water to the corresponding second measuring channel. The weir is installed at the outlet end of the second measuring channel; in addition, the inlet end of each second measuring channel is installed with a third gate 10, which is located on one side of the vertical pump 12. The third gate 10 can control the opening and closing between the water outlet pool 9 and the corresponding second measuring channel, and can also isolate each second measuring channel.

[0028] Combine the following Figure 1 and Figure 2 The above structure is further described, wherein n=2, so there are two second measurement channels in total.

[0029] like Figure 1As shown, the first measuring channel includes an inlet channel 2, a first gate 3, a first reducing flange 4, a horizontal pump 5, a second reducing flange 6, a second gate 7 and an outlet channel 8. Along the flow direction of the medium, the components are connected in sequence, specifically: the inlet channel 2 is in the front, followed by the first gate 3, the first reducing flange 4, the horizontal pump 5, the second reducing flange 6, the second gate 7, and the outlet channel 8 is at the end.

[0030] In addition, along the medium flow path, the inner diameter of the water inlet channel 2 gradually decreases, which is a tapered structure; the inner diameter of the outlet channel 8 gradually increases, which is a diffusion type; the inner diameter of the first variable diameter flange 4 also changes from large to small (or adopts a constant diameter structure), and the inner diameter of the second variable diameter flange 6 gradually increases from a smaller size (or adopts a constant diameter structure). This inner diameter change design plays a key role in regulating the flow rate and pressure of the medium in the channel, and thus affects the accuracy and stability of the entire pump performance test.

[0031] like Figure 1 As shown, the second measuring channel is a weir groove 15. Figure 1 In the horizontal direction, i.e., the first direction, the vertical pump 12 is installed at the inlet of the weir groove 15, and the weir groove 15 is in a linear structure as a whole. In the second direction perpendicular to the first direction, the third gate 10 is installed at the end of the groove wall of the first weir groove 15 close to the outlet pool 9, and the first weir groove 15 is the weir groove 15 closest to the outlet pool 9; in the second direction, the adjacent weir grooves 15 share the groove wall, and the third gate 10 is installed at the end of the shared groove wall. When viewed along the second direction, the outlet pool 9 and the weir groove 15 are connected to each other.

[0032] It should be noted that Figure 1 It can be seen from the structure that the two weirs 15 are arranged in parallel, and the distances between each weir 15 and the outlet pool 9 are different. Among them, the weir 15 closest to the outlet pool 9 needs to be installed with a third gate 10 between it and the outlet pool 9 to control the opening and closing of the weir 15. For the second weir 15, another third gate 10 needs to be installed between it and the first weir 15, and this gate can adjust the on-off state between the two adjacent weirs 15. When the second third gate 10 is closed, it actually has the effect of extending the wall of the weir 15, and its function is to separate the adjacent weirs 15 from each other. In addition, the vertical pump 12 has a stable pumping capacity and can always pump water from the inlet pool 1 into the weir 15. The opening and closing state of the third gate 10 will not affect the pumping operation of the vertical pump 12.

[0033] Furthermore, a weir plate 11 and a rectifying grid 14 are installed at the bottom of the weir groove 15. The weir plate 11 is located on the bottom plate at the outlet end of the weir groove 15. It serves as the weir of the second measurement channel. The weir plate 11 can form a water tongue at the outlet position of the weir groove 15. The formation of the water tongue helps to establish a stable relationship between water head and flow. When the water flows through the weir plate 11 to form a water tongue, the water flow shape is relatively stable. According to relevant hydraulic principles and formulas, by measuring parameters such as the water head on the weir (i.e., the vertical distance from the top of the water tongue to the top of the weir plate 11), the flow rate of the water flow can be calculated more accurately. The rectifying grid 14 is located on the bottom plate at the inlet end of the weir groove 15, which can rectify the water flow flowing into the weir groove 15.

[0034] It should be noted that the top of the weir plate 11 is the weir mouth, and the area above the weir mouth is the upper weir area.

[0035] like Figure 2 As shown, the vertical pump 12 is provided with an extraction pipe 1201 and a discharge pipe 1202, wherein the extraction pipe 1201 is located in the water inlet tank 1, and the discharge pipe 1202 is located at the inlet of the second measuring channel. Therefore, when the vertical pump 12 is working, water can be drawn from the water inlet tank 1 through the extraction pipe 1201 at the bottom, and then delivered to the weir 15 through the discharge pipe 1202.

[0036] Combination Figure 1 and Figure 2 It can be seen that the water inlet pool 1 is also connected to a regulating water pool 13. The regulating water pool 13 is Figure 1 The outside of the neutral pump 12 and the bottom are connected with the water inlet pool 1, and the two are equivalent to a communicating vessel. When the amount of water in the water inlet pool 1 decreases, the regulating water pool 13 can replenish water to the water inlet pool 1 to avoid the water level of the water inlet pool 1 being too low. Conversely, when the amount of water in the water inlet pool 1 increases, the regulating water pool 13 can prevent the water level of the water inlet pool 1 from being too high or increasing too fast.

[0037] It should be noted that Figure 1 and Figure 2 The device arranges two parallel weirs 15 above the interconnected water storage tank (water inlet tank 1 + regulating water tank 13), and through the combined design with the gate, the test device can be used to test the horizontal pump 5 and the vertical pump 12, which expands the use of the test device, greatly reduces the floor space of the test device, and also reduces the amount of earth excavation, thereby reducing the construction cost of the test device.

[0038] like Figure 3 As shown, a water weir measuring pump performance test method is applied to the above-mentioned water weir measuring pump performance test device, which can perform any steps S1-S3 according to the situation, as follows: S1: Keep the first measuring channel, the water outlet pool 9 and the m second measuring channels connected, and test the flow rate of the horizontal pump 5 through the liquid level heights of the m second measuring channels, n≥m≥1.

[0039] S2: The first measuring channel is closed and the adjacent second measuring channel is isolated by the third gate 10, and the water of the water inlet pool 1 is pumped by the single vertical pump 12 and transported to the single second measuring channel, and then the flow rate of the single vertical pump 12 is measured by the liquid level height of the single second measuring channel; S3: Close the first measuring channel and control the third gate to connect the k second measuring channels, draw water from the water inlet pool 1 through a single vertical pump 12 and transport it to the k second measuring channels, and then measure the flow rate of the single vertical pump 12 through the liquid level height of the k second measuring channels, n≥k≥1.

[0040] It should be noted that, through the above steps, it can be known that the first measurement channel and the second measurement channel of the present invention need to work together when conducting the test. In the entire process of the water flow (the path of the first measurement channel + the outlet pool 9 + the second measurement channel), the water flow will generate resistance, and the horizontal pump 5 or the vertical pump 12 being tested must not only overcome the resistance, but also overcome the force required for the water flow to be lifted from the inlet pool 1 and submerge the weir of the second measurement channel (i.e., the weir plate 11 in the weir groove 15). Therefore, it is necessary to measure the minimum head of the horizontal pump 5 and the vertical pump 12, and at the same time, it is necessary to measure the water flow rate drawn from the inlet pool 1 (to determine the pump flow rate).

[0041] The water weir pump performance test method is described below in conjunction with the specific flow rates of the horizontal pump 5 and the vertical pump 12 .

[0042] For example, when the flow rate of horizontal pump 5 is 15.3m 3 / s≤Q≤30.6m 3 / s, n=2, m=2, at this time, the first gate 3, the second gate 7 and all the third gates 10 can be opened (at this time, there are two parallel weirs 15, so there are two third gates 10 in total). When working, the horizontal pump 5 can pump water from the water inlet pool 1 and transport it to the water outlet pool 9, and then the water in the water outlet pool 9 enters the two parallel weirs 15, and finally the minimum lift of the horizontal pump 5 is calculated by observing the liquid level height of the weir 15.

[0043] When measuring the minimum head: At maximum flow rate 30m 3 / s as an example, the total area of ​​the pool and the weir 15 is A 总 =1226.4m 2 (including the regulating area of ​​the regulating pool 13), the head volume on the weir (on the weir groove 15) at the maximum flow rate is: V 堰上 =b×L堰槽 ×h=772.3m 3 ; (1) In the formula, b is the width of the weir; h is the height from the weir mouth to the top of the water tongue on the weir (i.e., the water head on the weir), where the weir mouth is the top of the weir plate 11; and L is the length of the weir groove 15.

[0044] It should be noted that the width of the weir corresponds to the surface that bears the direct impact of the water flow. Figure 1 In the figure, it is the surface perpendicular to the flow direction of the water. In addition, not all weirs 15 will be used during measurement, so b should calculate the weir plates 11 that have been used. In addition, when calculating the width of the weir used, if there is only one second measurement channel, only the width of the weir plate 11 in the channel is calculated. If there are multiple channels, the total width of the weir plates 11 in multiple channels is calculated.

[0045] The volume of the pool where the water level drops from the rim to the bottom of the weir 15 is V 堰底 =613.5m 3 , so the water level below the weir plate 11 drops to: ⊿H 堰下 =(V 堰上+ V 堰底 ) / A 总 =1.13m; (2) The total resistance drop ∑h at maximum flow rate is obtained by formulas (1) and (2): ƒ =⊿H 堰下 +h f =1.4m, where h f See formula (5).

[0046] Through the above calculation process, it can be known that the head of the tested pump must be greater than the total resistance drop, which can be used to obtain the minimum head that can be measured at the maximum flow rate of the tested pump. Similarly, the minimum measured head corresponding to each flow point can be calculated. This makes the minimum head that can be measured by the test device lower, solves the problem that it is difficult to test ultra-large flow and low-head pumps, and also broadens the test range of water weir testing large pump performance parameters.

[0047] It should be noted that when conducting a large-flow, low-lift pump test, the water in the regulating pool 13 can be directed to the inlet pool 1 to reduce the water level difference of the inlet pool 1; at the same time, the contraction angle of the inlet channel 2 is designed to 8°, and the diffusion angle of the outlet channel 8 is designed to 10° to reduce the along-the-way losses of the pump inlet and outlet channels 8. In this way, according to the fluid energy equation, the minimum lift of the measured pump can be minimized.

[0048] When measuring flow: The following is the maximum flow of 30m 3 Taking a horizontal pump 5 with a capacity of 1000 rpm and two weirs 15 as an example, the design process is described.

[0049] (1) Set the maximum flow rate of horizontal pump 5 to 30m 3 / s, designed maximum water head of full width weir h max =1.5m, based on engineering experience, the design water head h on the weir is taken d =0.8h max =1.2m.

[0050] (2) Based on the full-width weir flow calculation formula: Q=C d ×2 / 3×(2×g) 1 / 2 ×b×h 3 / 2 ; (3) In the formula, the flow coefficient C d =0.602+0.075×h / E, h is the water head on the weir of the second measuring channel (i.e., weir slot 15), in m; E is the height of the weir (i.e., weir plate 11) of the second measuring channel, in m. Gravitational acceleration g=9.81, substituting it into the measured weir width b=10.82≈11m, the designed length of weir slot 15 is 65m. It can be known from the water tongue formation condition that the minimum water head on the weir h min =0.44m, substituting into the above flow calculation formula, the minimum measured flow and maximum flow of a single weir are 3.05m 3 / s and 15.3m 3 / s.

[0051] Therefore, when measuring the minimum head, the weir and flume 15 combinations are reasonably distributed according to the flow rate of the measured pump to carry out the test, which can make the measurement more accurate.

[0052] It should be noted that in the design process, the different relationships between the Xie Cai coefficient C and the flow channel resistance coefficient λ and the flow channel roughness coefficient n need to be considered, such as: C=R 1 / 6 / n,λ=8×g / C 2 ; (4) The calculation formula of the resistance along the weir groove 15 is summarized as follows: h ƒ =L×ν 2 ×N 2 ×(1 / h+2 / b) 4 / 3 ; (5) Among them, h f It represents the head loss of water flowing along the process flow, and the unit is m; the process flow is the length of water flowing from the inlet of the first measuring channel to the outlet of the second measuring channel; L is the process flow; ν is the flow velocity of the water flow; N represents the roughness coefficient of the second measuring channel.

[0053] Hydraulic radius R = A / x = b×h / (b+2h), A is the cross-sectional area of ​​the water flow, unit: m 2 , x is the wetted perimeter of the water-passing section and the weir 15, and x=2h+b, in m.

[0054] According to the above formulas (3)-(5), the flow channel design can be optimized and the flow velocity can be reduced to reduce the resistance along the measuring weir. At the same time, the level difference ⊿H between the inlet and outlet pools under the measured flow rate can be reduced by a unique regulating pool, so that the total resistance is reduced by ∑h ƒ =h ƒ +⊿H is the smallest.

[0055] For example, when the flow rate of horizontal pump 5 is 3.05m 3 / s≤Q≤15.3m 3 / s, n=2, m=1. At this time, the first gate 3, the second gate 7 and the third gate 10 of the weir trough 15 closest to the outlet pool 9 can be opened. When working, the horizontal pump 5 can pump water from the inlet pool 1 and transport it to the outlet pool 9, and then the water in the outlet pool 9 enters the weir trough 15 closest to the outlet pool 9. Finally, the flow rate and minimum lift of the horizontal pump 5 are calculated by observing the liquid level height of the weir trough 15.

[0056] For example, when the flow rate of the vertical pump 12 is 3.05m 3 / s≤Q≤15.3m 3 / s, n=2. At this time, the first measuring channel is closed and the adjacent weir slots 15 are separated by the third gate 10, and the water of the water inlet pool 1 is pumped by a single vertical pump 12 and transported to the single weir slot 15, and then the flow rate and the minimum head of the single vertical pump 12 are measured by the liquid level height of the single weir slot 15.

[0057] For example, when the flow rate of the vertical pump 12 is 15.3m 3 / s≤Q≤30.6m 3 / s, n=2, k=2. At this time, the first measuring channel can be closed and the third gate 10 between the two weir grooves 15 can be opened to ensure that the two weir grooves 15 are connected to each other at the inlet end (the third gate between the first weir groove 15 and the outlet pool 9 is not opened), and then the single vertical pump 12 draws water from the inlet pool 1 and transports the water to the two second measuring channels, and then the flow rate and minimum head of the single vertical pump 12 are measured through the liquid level height of the two second measuring channels.

[0058] like Figure 4 As shown, a construction method can be used to calculate the size of the weir 15 according to the flow rate, as follows: A1: Set the maximum flow rate of the pump to be tested and the design water head of the weir, the pump to be tested is a horizontal pump 5 or a vertical pump 12; A2: Calculate the width of the weir based on the maximum flow of the pump to be tested and the design head of the weir. The calculation formula is as follows: Q 设定 =C d ×2 / 3×(2×g) 1 / 2 ×b1×h 设定 3 / 2 ; (6) In the formula, the flow coefficient Cd = 0.602 + 0.075 × h 设定 / E;h 设定 is the water head on the weir of the second measurement channel, E is the height of the weir of the second measurement channel; g is the acceleration of gravity; b1 is the width of the weir during measurement; Q 设定 is the maximum flow rate of the pump to be tested.

[0059] A3: The number and length of the second measurement channels are set based on the width of the weir, and the length of the second measurement channel is greater than ten times the width of the weir.

[0060] It should be noted that, in the above design process, two parallel weirs 15 are arranged above the interconnected water storage tank (water inlet tank 1 + regulating water tank 13), and through the combined design with the gate, the test device can be used to test the horizontal pump 5 and the vertical pump 12, which expands the use of the test device, greatly reduces the floor space of the test device, and also reduces the amount of earth excavation, thereby reducing the construction cost of the test device.

[0061] Combination Figure 1-Figure 4 The single and double weir measurement modes designed by the construction method of the present invention broaden the flow range of the pump test, and at the same time, the single and double weirs are reasonably distributed through calculation, so that the test result accuracy is higher; secondly, the unique regulating water tank 13 and water circulation system designed greatly reduce the inlet and outlet water level difference and flow resistance when testing the pump, so that the testable head is lower, broadening the range of pump test performance parameters, and solving the problem of difficulty in testing ultra-large flow and ultra-low head pumps; finally, a water weir method pump test device is constructed in a limited space through a combination of flow channel design to meet the performance test of different pump types such as horizontal and vertical pumps, expand the use of the test device, and greatly save the land resources and construction costs of factories and enterprises.

[0062] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water weir pump performance test device, characterized in that: It comprises a water inlet pool (1), a water outlet pool (9), a vertical pump (12), a first measuring channel, a weir and a plurality of second measuring channels; The inlet end of the first measuring channel is in communication with the water inlet pool (1), and the outlet end is in communication with the water outlet pool (9), and a horizontal pump (5) is installed in the first measuring channel; n second measurement channels are arranged in parallel, and the inlet end of the second measurement channel is connected to the water outlet pool (9), and the outlet end is connected to the water inlet pool (1), and n≥2; The vertical pump (12) is installed on one side of the inlet end of the second measuring channel, and is used to draw water from the water inlet pool (1) and transport it to the corresponding second measuring channel; A third gate (10) is installed at the inlet end of each of the second measuring channels, and the third gate is located on one side of the vertical pump (12); The weir is installed at the outlet end of the second measurement channel.

2. A water weir measuring pump performance test device according to claim 1, characterized in that: The first measuring channel further comprises a water inlet channel (2), a first gate (3), a first reducing flange (4), a second reducing flange (6), a second gate (7) and an outlet channel (8); Along the water flow direction, the water inlet channel (2), the first gate (3), the first reducing flange (4), the horizontal pump (5), the second reducing flange (6), the second gate (7) and the outlet channel (8) are connected in sequence.

3. A water weir measuring pump performance test device according to claim 2, characterized in that: Along the flow direction: The water inlet channel (2) is a tapered structure; The outlet flow channel (8) is a diffusion structure.

4. A water weir measuring pump performance test device according to claim 1, characterized in that: The second measuring channel is a weir (15); Along the first direction, the vertical pump (12) is installed at the inlet end of the weir groove (15), and the weir groove (15) is a linear structure; Along a second direction perpendicular to the first direction, the third gate (10) is installed at the end of the groove wall of the first weir groove (15) closest to the water outlet pool (9), and the first weir groove (15) is the weir groove (15) closest to the water outlet pool (9); Along the second direction, adjacent weir grooves (15) share a groove wall, and the third gate (10) is installed at the end of the shared groove wall.

5. A water weir measuring pump performance test device according to claim 4, characterized in that: The bottom plate of the weir groove (15) is provided with a weir plate (11) and a rectifying grid (14); The weir plate (11) is mounted on the bottom plate at the outlet end of the weir groove (15), and both ends of the weir plate (11) are respectively against the groove wall of the weir groove (15); The weir plate (11) is a weir of the second measuring channel, and the area above the top of the weir plate (11) is the upper weir; The rectifying grid (14) is mounted on the bottom plate at the inlet end of the weir (15).

6. A water weir measuring pump performance test device according to claim 1, characterized in that: The vertical pump (12) is provided with an extraction pipe (1201) and a discharge pipe (1202); The extraction pipe (1201) is located in the water inlet pool (1), and the discharge pipe (1202) is located on one side of the inlet end of the second measurement channel.

7. A water weir measuring pump performance test device according to any one of claims 1 to 6, characterized in that: The water inlet pool (1) is also connected to a regulating water pool (13).

8. A water weir pump performance test device according to any one of claims 1 to 6, characterized in that: Two second measurement channels are provided.

9. A water weir measuring pump performance test method, applied to a water weir measuring pump performance test device according to any one of claims 1 to 8, characterized in that: The following steps are involved: The first measuring channel, the water outlet pool (9) and the m second measuring channels are kept in communication, and the flow rate of the horizontal pump (5) is tested by the liquid level heights of the m second measuring channels, where n≥m≥1; Alternatively, the first measuring channel is closed and the adjacent second measuring channel is isolated by a third gate (10), water from the water inlet pool (1) is pumped by a single vertical pump (12) and transported to a single second measuring channel, and the flow rate of the single vertical pump (12) is measured by the liquid level height of the single second measuring channel; Alternatively, the first measuring channel is closed and the third gate is controlled to connect the k second measuring channels, water is drawn from the water inlet pool (1) by a single vertical pump (12) and delivered to the k second measuring channels, and the flow rate of the single vertical pump (12) is then measured by the liquid level heights of the k second measuring channels, where n≥k≥1.

10. A water weir measuring pump performance test method according to claim 9, characterized in that: The flow rate formula is as follows: Q=C d ×2 / 3×(2×g) 1 / 2 ×b×h 3 / 2 ; In the formula, the flow coefficient C d =0.602+0.075×h / E; h is the water head on the weir of the second measuring channel, in m; E is the height of the weir of the second measuring channel; g is the acceleration of gravity; b is the width of the weir used.

11. A water weir pump performance test method according to claim 9, characterized in that: When the flow rate of the horizontal pump (5) is 15.3m 3 / s≤Q≤30.6m 3 / s, m=2; When the flow rate of the horizontal pump (5) is 3.05m 3 / s≤Q≤15.3m 3 / s, m=1; When the flow rate of the vertical pump (12) is 3.05m 3 / s≤Q≤15.3m 3 / s, k=1; When the flow rate of the vertical pump (12) is 15.3m 3 / s≤Q≤30.6m 3 / s, k=2.

12. A construction method for constructing a water weir measuring pump performance test device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Setting the maximum flow rate of the pump to be tested and the design water head of the weir, wherein the pump to be tested is a horizontal pump (5) or a vertical pump (12); Calculate the width of the weir based on the maximum flow of the pump to be tested and the design head of the weir; The number of second measurement channels and the length of the second measurement channels are set based on the width of the weir.

13. A construction method according to claim 12, characterized in that: The width of the weir is calculated based on the maximum flow of the pump to be tested and the design head of the weir to meet the following requirements: Q 设定 =C d ×2 / 3×(2×g) 1 / 2 ×b1×h 设定 3 / 2 ; In the formula, the flow coefficient Cd = 0.602 + 0.075 × h 设定 / E;h 设定 is the water head on the weir of the second measurement channel, E is the height of the weir of the second measurement channel; g is the acceleration of gravity; b1 is the width of the weir during measurement; Q 设定 is the maximum flow rate of the pump to be tested.

14. A construction method according to claim 13, characterized in that: The length of the second measuring channel is greater than ten times the weir width.

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