A centrifugal sewage pump impeller dynamic balance test device

Abstract

The invention discloses a centrifugal sewage pump impeller dynamic balance test device, and relates to the technical field of impeller dynamic balance test devices. A centrifugal sewage pump impeller dynamic balance test device comprises a mounting platform, and also comprises: a fixed plate, which is fixedly connected to the mounting platform, and a plurality of dynamic balance test workstations are arranged on the circumference of the fixed plate, and each of the dynamic balance test workstations is provided with a sleeve, and the sleeve is respectively provided with an inlet pipe and an outlet pipe fitting, and a flow meter is installed on the outlet pipe fitting; the present invention can effectively simulate the dynamic balance performance of multiple impellers when rotating on the shaft, and the dynamic balance performance of the impellers when they are located at different positions on the shaft by arranging a pad test assembly between multiple impellers on the shaft, and then effectively judge the impeller dynamic balance test result, meet the demand of being able to perform dynamic balance tests on multiple impellers at one time, improve the performance of the sewage pump, and make it more suitable for use in ultrafiltration, reverse osmosis water treatment processes and water treatment transportation and management complete sets of equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of impeller dynamic balance testing devices, and in particular relates to a centrifugal sewage pump impeller dynamic balance testing device. Background Art

[0002] In ultrafiltration, reverse osmosis water treatment processes and supporting water treatment and transportation equipment, sewage pumps can be used as important equipment for water lifting and power transmission in some water treatment processes. At the same time, sewage pumps are often used in regional smart water operation and maintenance management and wastewater collection and recycling and other process supporting treatments. Compared with ordinary centrifugal water pumps, vertical centrifugal sewage pumps in sewage pumps have added filter group accessories in wastewater treatment systems, and have carried out targeted adaptive design of filter group accessories according to different water pollutants or particulate matter content, making centrifugal sewage pumps widely used in ultrafiltration and reverse osmosis water treatment processes.

[0003] To sum up, as a type of sewage pump, the centrifugal sewage pump is an important component of the regional water treatment intelligent operation and maintenance management system; the impeller is an important component in the production of centrifugal sewage pumps, and the dynamic balance performance of the impeller determines the liquid delivery head and working performance. If multiple impellers on the shaft vibrate during rotation, it will cause overall shaking of the centrifugal sewage pump, increased noise, reduced liquid delivery distance and other disadvantages. The existing impeller dynamic balance test equipment is mainly used to test the dynamic balance of a single impeller on the shaft, and the centrifugal sewage pump is composed of two or more impellers, all of which are installed on one shaft. Therefore, the existing test equipment is difficult to meet the dynamic balance test of multiple impellers on the same shaft. For this reason, a centrifugal sewage pump impeller dynamic balance test device is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a centrifugal sewage pump impeller dynamic balancing test device that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a centrifugal sewage pump impeller dynamic balance test device, including a mounting platform, and also including: a fixed plate, fixedly connected to the mounting platform, a plurality of dynamic balance test workstations are arranged circumferentially on the fixed plate, each of the dynamic balance test workstations is provided with a sleeve, the sleeve is respectively provided with an inlet pipe and an outlet pipe fitting, a flow meter is installed on the outlet pipe fitting for testing dynamic balance; a rotating shaft, rotatably connected to the bottom of the sleeve; a spline shaft, one end of which is detachably connected to the rotating shaft, and a plurality of impellers are sleeved on the spline shaft; a support spring, sleeved on the spline shaft and located on the bottom wall of the sleeve, and the impeller is located on the support spring; a driving assembly, used to drive the rotating shaft to rotate; a push rod, arranged above the sleeve; a pad test assembly, arranged between the plurality of impellers, for testing the dynamic balance of the impeller on the spline shaft.

[0006] Preferably, the pad test assembly includes a first test piece, which includes a long limit sleeve with a first support sleeve and a first gasket ring connected at both ends, and the first support sleeve, the long limit sleeve and the first gasket ring are located between adjacent impellers. When the first test piece is arranged between multiple impellers on the spline shaft, it is used to test the dynamic balance of the impeller when the spacing is regularly displaced.

[0007] Preferably, the pad test assembly includes a second test piece, the second test piece includes a test spring with a second support sleeve and a second gasket ring connected at both ends, a short limit sleeve is fixedly connected to the second gasket ring, the second support sleeve, the test spring, the second gasket ring and the short limit sleeve are located between adjacent impellers. When the second test piece is arranged between multiple impellers on the spline shaft, it is used to test the dynamic balance of the impeller when the spacing is displaced by a fixed value.

[0008] Preferably, the pad test assembly includes a third test piece, and the third test piece includes multiple groups of coarse springs and thin springs with third support sleeves and third gasket rings connected at both ends respectively. The third support sleeve, coarse spring, third gasket ring and third support sleeve, thin spring and third gasket ring are layered between adjacent impellers. When the third test piece is arranged between multiple impellers on the spline shaft, it is used to test the dynamic balance of the impeller when the spacing is irregularly displaced.

[0009] Preferably, a threaded sleeve is fixedly connected to the bottom circumference of the sleeve, and the threaded sleeve is mounted on the fixed plate by bolts.

[0010] Furthermore, a fixing groove is provided at one end of the rotating shaft, a plane groove is provided on the outer periphery of the end of the spline shaft, a locking screw is threadedly connected to one side of the rotating shaft, one end of the locking screw passes through the fixing groove and abuts against the plane groove; an upper cover is threadedly connected to the sleeve, the water outlet pipe fitting is connected to the upper cover, a positioning sleeve is fixedly connected to the bottom surface of the upper cover, the top end of the spline shaft is located in the positioning sleeve, a socket is provided on the upper cover, and the socket corresponds to the push rod; it also includes a compression sleeve sleeved on the top end of the spline shaft, and a locking nut is threadedly connected to the top end of the spline shaft.

[0011] Preferably, the driving assembly comprises a toothed disc and a spur gear, the toothed disc is rotatably connected to the mounting platform via a motor, the spur gear is mounted on a rotating shaft, and the rotating shaft is meshed with the toothed disc.

[0012] Preferably, a connecting frame is installed on the mounting platform, a servo motor is installed on the connecting frame, and a cross mounting frame is also included, electric push rods are installed on the four straight sides of the cross mounting frame, the push rod is installed on the telescopic end of the electric push rod, and the cross mounting frame is installed on the output end of the servo motor.

[0013] Furthermore, the sleeve is connected to a connecting pipe, both ends of which lead to the upper and lower ends of the sleeve respectively, the connecting pipe is equipped with a connecting nozzle, and the connecting nozzle is equipped with a switching valve for injecting air into the sleeve through the connecting pipe during the dynamic balancing test.

[0014] Furthermore, the end of the rotating shaft is fixedly connected to a mounting plate, an eccentric rod is fixedly connected to the mounting plate, a piston cylinder is installed on the bottom surface of the mounting platform, a piston rod is slidably connected in the piston cylinder, one end of the piston rod is rotatably connected to the eccentric rod, an air inlet pipe and an air outlet pipe are respectively provided on the piston cylinder, and a one-way valve is provided on the air inlet pipe and the connecting pipe.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] 1. The centrifugal sewage pump impeller dynamic balancing test device can effectively simulate the dynamic balancing performance of multiple impellers when rotating on the spline shaft and the dynamic balancing performance of the impellers at different positions on the spline shaft by setting a pad test assembly between multiple impellers on the spline shaft, thereby effectively judging the dynamic balancing test results of the impellers and meeting the demand for dynamic balancing tests on multiple impellers at one time;

[0017] 2. The centrifugal sewage pump impeller dynamic balance test device, when the pad test assembly adopts the first test piece, can make the spacing between adjacent impellers be changed on the spline shaft with a fixed value, and then test the dynamic balance performance of the impeller on the spline shaft, so that the technician can easily replace the impeller on the spline shaft according to the test results to meet the dynamic balance requirements of multiple impellers on the spline shaft;

[0018] 3. The centrifugal sewage pump impeller dynamic balance test device, when the cushion block test assembly adopts the second test piece, the electric push rod drives the push rod to push the impeller, the test spring is squeezed between the impellers, and the short limit sleeve can limit the spacing between adjacent impellers, so that the dynamic balance of multiple impellers on the spline shaft can be judged when the impellers reduce the spacing by a fixed value on the spline shaft;

[0019] 4. The centrifugal sewage pump impeller dynamic balance test device, when the pad test assembly adopts the third test piece, multiple impellers will be displaced at irregular positions on the spline shaft, and the spacing between adjacent impellers will also change irregularly, thereby performing a dynamic balance performance test of multiple impellers on the spline shaft. In addition, the setting of the third test piece can also simulate the failure of the centrifugal sewage pump. When the impeller moves irregularly on the spline shaft, the centrifugal sewage pump can maintain effective operation for a long time, which is convenient for analyzing the working state of the centrifugal sewage pump;

[0020] 5. The centrifugal sewage pump impeller dynamic balance test device injects gas into the sleeve through the connecting pipe when water enters the sleeve. The injected gas forms air cavities and bubbles in the sleeve to increase the load on the rotation of the impeller. Secondly, it is used to simulate the dynamic balance of the impeller rotation when gas is pumped into the centrifugal sewage pump during the water pumping process.

[0021] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1 A schematic diagram of the three-dimensional structure of a centrifugal sewage pump impeller dynamic balance test device proposed by the present invention;

[0024] Figure 2 A schematic diagram of the structure of a toothed disc and a spur gear of a centrifugal sewage pump impeller dynamic balance test device proposed by the present invention;

[0025] Figure 3 A schematic structural diagram of a cross mounting frame, an electric push rod, and a push rod of a centrifugal sewage pump impeller dynamic balancing test device proposed by the present invention;

[0026] Figure 4A schematic structural diagram of a sleeve of a centrifugal sewage pump impeller dynamic balance test device proposed by the present invention;

[0027] Figure 5 A centrifugal sewage pump impeller dynamic balance test device proposed by the present invention Figure 4 The structural diagram at A in the middle;

[0028] Figure 6 A top view of a centrifugal sewage pump impeller dynamic balance test device proposed by the present invention;

[0029] Figure 7 This is a structural schematic diagram of a connecting pipe and a piston cylinder of a centrifugal sewage pump impeller dynamic balance test device proposed by the present invention;

[0030] Figure 8 A centrifugal sewage pump impeller dynamic balance test device proposed by the present invention Figure 7 The structural diagram at B in the middle;

[0031] Fig. 9 A schematic diagram of the structure of a coarse spring and a thin spring of a centrifugal sewage pump impeller dynamic balance test device proposed by the present invention;

[0032] Fig.10 A centrifugal sewage pump impeller dynamic balance test device proposed by the present invention Fig. 9 The structural diagram at C in the middle;

[0033] Fig.11 The present invention is a schematic structural diagram of an upper cover of a centrifugal sewage pump impeller dynamic balance test device.

[0034] In the figure: 1, mounting table; 10, flow meter; 11, fixing plate; 111, toothed plate; 112, spur gear; 113, motor; 12, sleeve; 121, upper cover; 1211, positioning sleeve; 122, water outlet pipe; 123, spline shaft; 1231, compression sleeve; 1232, locking nut; 124, impeller; 125, rotating shaft; 1251, fixing groove; 1252, locking screw; 126, supporting top sleeve; 1261, supporting spring; 1262, contact sleeve; 127, water inlet pipe; 128, jack; 13, first test piece; 131, long limit sleeve; 132, first support Sleeve; 133, first gasket ring; 14, second test piece; 141, test spring; 142, second support sleeve; 143, second gasket ring; 144, short limit sleeve; 15, third test piece; 150, thick spring; 1500, thin spring; 151, third support sleeve; 152, third gasket ring; 2, connecting pipe; 21, connecting nozzle; 22, switching valve; 3, connecting frame; 31, cross mounting frame; 32, electric push rod; 33, push rod; 34, servo motor; 4, piston cylinder; 41, piston rod; 42, mounting plate; 421, eccentric rod; 43, air inlet pipe; 44, air outlet pipe. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0036] The following is combined with Figure 1 -Attached Fig.11 , describes in detail the technical solutions provided by each embodiment of the present invention.

[0037] Example 1: Reference Figure 1-Figure 11A centrifugal sewage pump impeller dynamic balance test device includes a mounting platform 1, and also includes: a fixed plate 11, fixedly connected to the mounting platform 1, a plurality of dynamic balance test workstations are arranged on the circumference of the fixed plate 11, each dynamic balance test workstation is provided with a sleeve 12, the sleeve 12 is respectively provided with an inlet pipe 127 and an outlet pipe 122, and a flow meter 10 is installed on the outlet pipe 122 for testing dynamic balance; a rotating shaft 125, rotatably connected to the bottom of the sleeve 12; a spline shaft 123, one end of which is detachably connected to the rotating shaft 125, and a plurality of spline shafts 123 are provided on the rotating shaft 125. The impeller 124 is sleeved on the spline shaft 123; the support spring 1261 is sleeved on the spline shaft 123 and located on the bottom wall of the sleeve 12, and the impeller 124 is located on the support spring 1261; the driving assembly is used to drive the rotating shaft 125 to rotate; the push rod 33 is arranged above the sleeve 12; the pad test assembly is arranged between the multiple impellers 124 to test the dynamic balance of the impeller 124 on the spline shaft 123; the bottom circumference of the sleeve 12 is fixedly connected with a threaded sleeve 120, and the threaded sleeve 120 is installed on the fixed plate 11 through bolts 1201;

[0038] A fixing groove 1251 is provided at one end of the rotating shaft 125, and a flat groove is provided on the outer periphery of the end of the spline shaft 123. A locking screw 1252 is threadedly connected to one side of the rotating shaft 125, and one end of the locking screw 1252 penetrates into the fixing groove 1251 and abuts against the flat groove; the upper cover 121 is threadedly connected to the sleeve 12, and the water outlet pipe 122 is connected to the upper cover 121. The material of the water outlet pipe 122 is a hose, which is convenient for moving the upper cover 121 to one side of the sleeve 12 The bottom surface of the upper cover 121 is fixedly connected with a positioning sleeve 1211, the top of the spline shaft 123 is located in the positioning sleeve 1211, and a plug hole 128 is opened on the upper cover 121, and the plug hole 128 corresponds to the push rod 33. The end of the push rod 33 is movably connected with a ball to reduce the friction with the surface of the impeller 124; it also includes a compression sleeve 1231 sleeved on the top of the spline shaft 123, and the top of the spline shaft 123 is threadedly connected with a locking nut 1232;

[0039] The driving assembly includes a toothed disc 111 and a spur gear 112. The toothed disc 111 is rotatably connected to the mounting platform 1 through a motor 113. The spur gear 112 is mounted on a rotating shaft 125, and the rotating shaft 125 is meshed with the toothed disc 111. A connecting frame 3 is mounted on the mounting platform 1, and a servo motor 34 is mounted on the connecting frame 3. The cross mounting frame 31 also includes an electric push rod 32, and the four straight sides of the cross mounting frame 31 are all mounted with an electric push rod 32. The push rod 33 is mounted on the telescopic end of the electric push rod 32. The cross mounting frame 31 is mounted on the output end of the servo motor 34. The setting of the servo motor 34 can drive the electric push rod 32 on the cross mounting frame 31 to move to the corresponding side of the sleeve 12, so as to prevent the electric push rod 32 from blocking the upper part of the sleeve 12, thereby facilitating the installation of the spline shaft 123, the impeller 124, and the pad test assembly into the sleeve 12.

[0040] This embodiment can effectively simulate the dynamic balancing performance of the multiple impellers 124 when rotating on the spline shaft 123 and the dynamic balancing performance of the impellers 124 at different positions on the spline shaft 123 by arranging a pad test assembly between the multiple impellers 124 on the spline shaft 123, thereby meeting the demand for dynamic balancing test of multiple impellers 124 at one time;

[0041] Specifically, one end of the spline shaft 123 is inserted into the sleeve 12, and the end is inserted into the fixing groove 1251 of the rotating shaft 125, and the locking screw 1252 is tightened so that one end of the locking screw 1252 is against the flat groove at the end of the spline shaft 123, so that the spline shaft 123 is connected to the rotating shaft 125, and then the support spring 1261, which is respectively connected to the supporting top sleeve 126 and the contact sleeve 1262 at both ends, is sleeved on the spline shaft 123, and the contact sleeve 1262 is made to contact with the bottom of the sleeve 12, and then the impeller 124 is sleeved on the spline shaft 123, and a pad test assembly is placed between adjacent impellers 124, and the upper cover 121 is tightened on the sleeve 12, and then the electric push rod 32 is used to push the push rod 33 downward, and insert it into the socket 128 to block the socket 128;

[0042] Then, the motor 113 drives the toothed disc 111 to rotate, and the toothed disc 111 engages with the spur gear 112 to drive the rotating shaft 125 to rotate, thereby driving the spline shaft 123 to rotate in the sleeve 12;

[0043] During the test, when there is no water in the sleeve 12, that is, when the impeller 124 is in a no-load state, the technician can first judge the dynamic balance of the impeller 124 during the rotation of the spline shaft 123 by hearing, and whether there is abnormal shaking or noise;

[0044] Then, the water inlet pipe 127 is placed in a water tank containing water, and the impeller 124 is driven to rotate by the spline shaft 123 to suck water into the sleeve 12, or an external water pump is connected to the water inlet pipe 127 to pump water into the sleeve 12. When the water enters the sleeve 12, it is used to simulate the dynamic balancing performance of multiple impellers 124 on the spline shaft 123 during the pumping process;

[0045] Secondly, the device is provided with a pad test assembly between adjacent impellers 124. When the spline shaft 123 rotates, the telescopic end of the electric push rod 32 moves up and down reciprocatingly, so that the end of the push rod 33 pushes the impeller 124 located at the top of the spline shaft 123. At this time, since the pad test assembly is provided between the impellers 124, the impeller 124 moves up and down reciprocatingly on the spline shaft 123. This makes it possible to perform a dynamic balance test on the impeller 124 without the impeller 124 being located at only a single position on the spline shaft 123. Therefore, the pad test assembly provided in the device is mainly used to test whether the force borne by the impeller 124 during rotation can meet the dynamic balance requirements when multiple impellers 124 are located at different positions of the spline shaft 123.

[0046] In this embodiment, the dynamic balance test is performed by observing and judging the flow meter 10 installed on the water outlet pipe 122. When the sleeve 12 discharges water to the outside through the water outlet pipe 122, the flow meter 10 will display the flow value and the waveform represented by the value on the display screen external to the flow meter 10;

[0047] When the dynamic balancing test is stable, the values ​​and waveforms are stable and regular; when the dynamic balancing of the impeller 124 is unqualified, the impeller 124 will shake, the pumping efficiency will change, and the water output will fluctuate unstably. Therefore, the values ​​and waveforms of the flow meter 10 are unstable, irregular, and abnormally fluctuating, which makes it convenient for technicians to judge the dynamic balancing results of the impeller 124.

[0048] Example 2: Reference Figure 5 , a centrifugal sewage pump impeller dynamic balance test device, which is basically the same as embodiment 1, and further: the pad test assembly includes a first test piece 13, the first test piece 13 includes a long limit sleeve 131 with a first support sleeve 132 and a first gasket ring 133 connected at both ends, the first support sleeve 132, the long limit sleeve 131, and the first gasket ring 133 are located between adjacent impellers 124, when the first test piece 13 is arranged between multiple impellers 124 on the spline shaft 123, it is used to test the dynamic balance of the impeller 124 when the spacing is regularly displaced;

[0049] The first support sleeve 132, the long limit sleeve 131, and the first cushion ring 133 in the first test piece 13 can make the spacing between adjacent impellers 124 a fixed value. Therefore, when the electric push rod 32 drives the push rod 33 to reciprocate and push the impeller 124 on the spline shaft 123 to move up and down, the spacing between adjacent impellers 124 can be changed on the spline shaft 123 with a fixed value, thereby testing the dynamic balancing performance of the impeller 124 on the spline shaft 123. This enables technicians to conveniently replace the impeller 124 on the spline shaft 123 according to the test results to meet the dynamic balancing requirements of multiple impellers 124 on the spline shaft 123.

[0050] During the test, when the push rod 33 reciprocates to push the impeller 124 to move, by observing the value of the flow meter 10, if the waveform corresponding to the value calculated by the flow meter 10 is regular, it means that the dynamic balance test is qualified. If the waveform is irregular or fluctuates abnormally, it means that the test is unqualified.

[0051] Example 3: Reference Figure 7 , Figure 8 , a centrifugal sewage pump impeller dynamic balance test device, which is basically the same as embodiment 1, and further: the pad test assembly includes a second test piece 14, the second test piece 14 includes a test spring 141 with a second support sleeve 142 and a second gasket ring 143 connected at both ends, a short limit sleeve 144 is fixedly connected to the second gasket ring 143, the second support sleeve 142, the test spring 141, the second gasket ring 143, and the short limit sleeve 144 are located between adjacent impellers 124, when the second test piece 14 is arranged between multiple impellers 124 on the spline shaft 123, it is used to test the dynamic balance of the impeller 124 when the spacing is displaced by a fixed value;

[0052] In this embodiment, it is mainly used to achieve the dynamic balance of multiple impellers 124 on the spline shaft 123 when the spacing between adjacent impellers 124 is reduced to a fixed value;

[0053] Specifically, the test spring 141 is used to support adjacent impellers 124, so that there is a certain distance between adjacent impellers 124. When the spline shaft 123 rotates, the electric push rod 32 drives the push rod 33 to push the impeller 124, and the test spring 141 is squeezed between the impellers 124. The short limit sleeve 144 can limit the distance between adjacent impellers 124. Therefore, when the impeller 124 reduces the distance on the spline shaft 123 by a fixed value, the dynamic balance of multiple impellers 124 on the spline shaft 123 can be determined.

[0054] In this embodiment, the judgment of the dynamic balancing result is basically the same as that in Embodiment 2, and both involve observing whether the numerical value and waveform displayed by the flow meter 10 are stable and regular.

[0055] Example 4: Reference Fig. 9 , Fig.10 , Fig.11, a centrifugal sewage pump impeller dynamic balance test device, which is basically the same as embodiment 1, and further: the pad test assembly includes a third test piece 15, the third test piece 15 includes a plurality of groups of coarse springs 150 and fine springs 1500 respectively connected with a third support sleeve 151 and a third gasket ring 152 at both ends, the third support sleeve 151, the coarse spring 150, the third gasket ring 152 and the third support sleeve 151, the fine spring 1500, and the third gasket ring 152 are arranged between adjacent impellers 124 in an upper and lower layered shape, and when the third test piece 15 is arranged between multiple impellers 124 on the spline shaft 123, it is used to test the dynamic balance of the impeller 124 when the spacing is irregularly displaced;

[0056] In this embodiment, by setting a third test piece 15, the third test piece 15 is composed of multiple groups of thick springs 150 and thin springs 1500, and the thick springs 150 and the thin springs 1500 are respectively sleeved between adjacent impellers 124. Since the supporting forces of the thick springs 150 and the thin springs 1500 are different, when the push rod 33 reciprocates to push the impeller 124 to displace in the sleeve 12, the multiple impellers 124 will be displaced at irregular positions on the spline shaft 123, and the spacing between adjacent impellers 124 will also change irregularly, thereby performing a dynamic balancing performance test of the multiple impellers 124 on the spline shaft 123. In addition, the setting of the third test piece 15 can also simulate the failure of the centrifugal sewage pump. When the impeller 124 moves irregularly on the spline shaft 123, the centrifugal sewage pump can maintain effective operation for a long time, which is convenient for analyzing the working state of the centrifugal sewage pump.

[0057] It should be noted that the material, number of turns, and inner diameter of the thick spring 150 and the thin spring 1500 are the same;

[0058] In one embodiment, the number of thick springs 150 and thin springs 1500 sleeved on the spline shaft 123 is averaged;

[0059] In another embodiment, the number of the thick springs 150 and the thin springs 1500 sleeved on the spline shaft 123 is averaged. If the average cannot be taken, the number of the thick springs 150 is greater than the number of the thin springs 1500.

[0060] In another embodiment, the number of the coarse springs 150 and the thin springs 1500 sleeved on the spline shaft 123 is averaged. If the average cannot be taken, the number of the thin springs 1500 is greater than the number of the coarse springs 150 .

[0061] Example 5: Reference Figure 7, a centrifugal sewage pump impeller dynamic balance test device, which is basically the same as embodiments 2, 3, and 4, and further: a connecting pipe 2 is connected to the sleeve 12, and both ends of the connecting pipe 2 lead to the upper and lower ends of the sleeve 12 respectively, and a connecting nozzle 21 is installed on the connecting pipe 2, and a switching valve 22 is installed on the connecting nozzle 21, which is used to inject air into the sleeve 12 through the connecting pipe 2 during the dynamic balance test;

[0062] During the test, when water is taken in by the sleeve 12, gas is injected into the sleeve 12 through the connecting pipe 2. The injected gas forms air cavities and bubbles in the sleeve 12 to increase the load on the rotation of the impeller 124. Secondly, it is used to simulate the dynamic balance of the impeller 124 rotating when gas is pumped into the centrifugal sewage pump during the pumping process.

[0063] Example 6: Reference Figure 7 , a centrifugal sewage pump impeller dynamic balance test device, which is basically the same as Example 5, and further: the end of the rotating shaft 125 is fixedly connected with a mounting plate 42, and the mounting plate 42 is fixedly connected with an eccentric rod 421, and a piston cylinder 4 is installed on the bottom surface of the mounting platform 1, and a piston rod 41 is slidably connected in the piston cylinder 4, and one end of the piston rod 41 is rotatably connected to the eccentric rod 421, and an air inlet pipe 43 and an air outlet pipe 44 are respectively provided on the piston cylinder 4, and a one-way valve is provided on the air inlet pipe 43 and the connecting pipe 2;

[0064] When the rotating shaft 125 rotates, the mounting plate 42 is driven to rotate, and then the eccentric rod 421 reciprocates to pull and push the piston rod 41 to slide in the piston cylinder 4, and air is introduced into the piston cylinder 4 through the air inlet pipe 43, and injected into the connecting pipe 2 through the air outlet pipe 44, so that no additional air pump is required;

[0065] Furthermore, the arrangement of the piston cylinder 4 can also enable the connecting pipe 2 to intermittently inject air into the sleeve 12, so as to further realistically simulate the air intake condition of the centrifugal sewage pump when pumping water;

[0066] When there is no need to inject gas into the sleeve 12 , the switching valve 22 on the connecting pipe 2 is switched to directly discharge the gas pumped by the piston cylinder 4 .

[0067] The present invention can effectively simulate the dynamic balance performance of multiple impellers 124 when rotating on the spline shaft 123 and the dynamic balance performance of the impellers 124 when they are located at different positions on the spline shaft 123 by setting a pad test assembly between multiple impellers 124 on the spline shaft 123, thereby effectively judging the dynamic balance test results of the impellers 124 and meeting the demand for dynamic balance tests on multiple impellers 124 at one time. Centrifugal sewage pump products manufactured by impeller 124 assemblies that pass the test of the present invention can ensure that their liquid delivery head and working performance meet the standards, avoid the overall shaking and low noise of the centrifugal sewage pump, improve the performance of the sewage pump, and make it more suitable for use in ultrafiltration, reverse osmosis water treatment processes and water treatment transportation and management complete sets of equipment.

[0068] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A centrifugal sewage pump impeller dynamic balance test device, comprising a mounting platform (1), characterized in that: Also includes: A fixed plate (11) is fixedly connected to the mounting platform (1), a plurality of dynamic balance test workstations are arranged on the circumference of the fixed plate (11), each of the dynamic balance test workstations is provided with a sleeve (12), a water inlet pipe (127) and a water outlet pipe fitting (122) are respectively provided on the sleeve (12), and a flow meter (10) is installed on the water outlet pipe fitting (122) for testing dynamic balance; A rotating shaft (125) rotatably connected to the bottom of the sleeve (12); A spline shaft (123), one end of which is detachably connected to the rotating shaft (125), and a plurality of impellers (124) are sleeved on the spline shaft (123); A support spring (1261) is sleeved on the spline shaft (123) and is located on the bottom wall of the sleeve (12); the impeller (124) is located on the support spring (1261); A driving assembly, used to drive the rotating shaft (125) to rotate; A push rod (33) disposed above the sleeve (12); A pad test assembly is arranged between the plurality of impellers (124) and is used to test the dynamic balance of the impellers (124) on the spline shaft (123).

2. A centrifugal sewage pump impeller dynamic balance test device according to claim 1, characterized in that: The pad test assembly comprises a first test piece (13), the first test piece (13) comprising a long limit sleeve (131) having a first support sleeve (132) and a first gasket ring (133) connected at both ends, the first support sleeve (132), the long limit sleeve (131), and the first gasket ring (133) being located between adjacent impellers (124). When a first test piece (13) is arranged between a plurality of impellers (124) on the spline shaft (123), it is used to test the dynamic balance of the impellers (124) when the impellers (124) are displaced at regular intervals.

3. A centrifugal sewage pump impeller dynamic balance test device according to claim 1, characterized in that: The cushion block test assembly comprises a second test piece (14), the second test piece (14) comprising a test spring (141) having a second support sleeve (142) and a second cushion ring (143) connected at both ends, a short limit sleeve (144) being fixedly connected to the second cushion ring (143), the second support sleeve (142), the test spring (141), the second cushion ring (143) and the short limit sleeve (144) being located between adjacent impellers (124), When a second test piece (14) is arranged between a plurality of impellers (124) on the spline shaft (123), it is used to test the dynamic balance of the impellers (124) when the spacing is displaced at a fixed value.

4. A centrifugal sewage pump impeller dynamic balance test device according to claim 1, characterized in that: The pad test assembly comprises a third test piece (15), the third test piece (15) comprising a plurality of groups of thick springs (150) and thin springs (1500) with third support sleeves (151) and third gasket rings (152) respectively connected at both ends, the third support sleeve (151), the thick spring (150), the third gasket ring (152), and the third support sleeve (151), the thin spring (1500), and the third gasket ring (152) being located between adjacent impellers (124) in an upper and lower layered manner, When a third test piece (15) is arranged between the plurality of impellers (124) on the spline shaft (123), it is used to test the dynamic balance of the impellers (124) when the spacing is irregularly displaced.

5. A centrifugal sewage pump impeller dynamic balance test device according to claim 2, 3 or 4, characterized in that: A threaded sleeve (120) is fixedly connected to the bottom circumference of the sleeve (12), and the threaded sleeve (120) is mounted on the fixed plate (11) via bolts (1201).

6. A centrifugal sewage pump impeller dynamic balance test device according to claim 2, 3 or 4, characterized in that: A fixing groove (1251) is formed at one end of the rotating shaft (125), a plane groove is formed on the outer periphery of the end of the spline shaft (123), a locking screw (1252) is threadedly connected to one side of the rotating shaft (125), and one end of the locking screw (1252) penetrates the fixing groove (1251) and abuts against the plane groove; The sleeve (12) is threadedly connected to an upper cover (121), the water outlet pipe (122) is connected to the upper cover (121), a positioning sleeve (1211) is fixedly connected to the bottom surface of the upper cover (121), the top end of the spline shaft (123) is located in the positioning sleeve (1211), and a plug hole (128) is provided on the upper cover (121), and the plug hole (128) corresponds to the push rod (33); It also comprises a compression sleeve (1231) sleeved on the top end of the spline shaft (123), and a locking nut (1232) is threadedly connected to the top end of the spline shaft (123).

7. A centrifugal sewage pump impeller dynamic balance test device according to claim 1, characterized in that: The driving assembly comprises a toothed disc (111) and a spur gear (112); the toothed disc (111) is rotatably connected to the mounting platform (1) via a motor (113); the spur gear (112) is mounted on a rotating shaft (125); and the rotating shaft (125) is meshed with the toothed disc (111).

8. A centrifugal sewage pump impeller dynamic balance test device according to claim 6, characterized in that: A connecting frame (3) is mounted on the mounting platform (1), and a servo motor (34) is mounted on the connecting frame (3). It also comprises a cross mounting frame (31), wherein electric push rods (32) are mounted on four straight sides of the cross mounting frame (31), the push rod (33) is mounted on the telescopic end of the electric push rod (32), and the cross mounting frame (31) is mounted on the output end of the servo motor (34).

9. A centrifugal sewage pump impeller dynamic balance test device according to claim 2, 3 or 4, characterized in that: The sleeve (12) is connected to a connecting pipe (2), the two ends of the connecting pipe (2) respectively lead to the upper and lower ends of the sleeve (12), the connecting pipe (2) is installed with a connecting nozzle (21), and the connecting nozzle (21) is installed with a switching valve (22) for injecting air into the sleeve (12) through the connecting pipe (2) during a dynamic balancing test.

10. A centrifugal sewage pump impeller dynamic balance test device according to claim 9, characterized in that: The end of the rotating shaft (125) is fixedly connected to a mounting plate (42), an eccentric rod (421) is fixedly connected to the mounting plate (42), a piston cylinder (4) is mounted on the bottom surface of the mounting platform (1), a piston rod (41) is slidably connected to the piston cylinder (4), one end of the piston rod (41) is rotatably connected to the eccentric rod (421), an air inlet pipe (43) and an air outlet pipe (44) are respectively provided on the piston cylinder (4), and a one-way valve is provided on the air inlet pipe (43) and the connecting pipe (2).

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