A pump body impeller dynamic balance stability performance detection device and method

Abstract

The application relates to the technical field of water pump detection, and discloses a pump body impeller dynamic balance stability performance detection device and method, which comprises a base and a control panel arranged on the base. A rotatable shaft on the base is driven by a motor, and the shaft is detected by a vibration sensor. An angle disc for finding an unbalance point of the impeller is arranged on the shaft. The angle disc comprises a balance disc in the middle and an angle ring with angles engraved on the outer side. The inner edge of the balance disc is provided with a plurality of counterweight bins arranged in a ring array. Each counterweight bin is internally provided with a water valve for liquid introduction and export. Compared with the traditional metal counterweight block which can only fix the weight and cannot be finely adjusted, the application uses liquid as the counterweight, accurately controls the liquid amount injected into the counterweight bin through the electromagnetic valve group, can realize milligram-level counterweight precision, and ensures that the counterweight adjustment is highly matched with the actual unbalance state of the impeller.

Description

Technical Field

[0001] This invention relates to the field of water pump testing technology, specifically to a device and method for testing the dynamic balance stability of a pump impeller. Background Technology

[0002] As the core power component of rotating machinery such as pumps, the dynamic balance performance of the impeller directly determines the stability, energy efficiency, and service life of the equipment. When the impeller's center of mass deviates from the axis of rotation due to machining errors, uneven material density, or assembly deviations, the imbalance of centrifugal force generated by high-speed rotation will cause severe vibration of the equipment. This not only accelerates the wear and failure of components such as bearings and mechanical seals, but may also lead to a 5%-10% increase in energy consumption, or even cause safety accidents such as blade fatigue fracture. Therefore, dynamic balance testing and calibration of impellers before they leave the factory has become a core quality control link in the field of fluid machinery manufacturing, and with the advancement of industrial development, the demand for testing accuracy and efficiency continues to rise.

[0003] Currently, mainstream impeller dynamic balancing detection technology mainly relies on balancing machines. Its basic principle involves using high-precision vibration sensors to collect vibration signals during impeller rotation, combining this with algorithms to analyze the phase and amplitude of the imbalance, and then correcting it through counterweighting or weight removal. However, existing technologies still have many shortcomings that urgently need to be addressed in practical applications.

[0004] Traditional calibration methods often employ solid counterweights or counterweight plates. Manual counterweight insertion requires the pre-preparation of various counterweight plates of different specifications, necessitating multiple trial insertions to adjust the balance. This is not only labor-intensive and inefficient, but also results in fixed weight gradients, making precise fine-tuning difficult and frequently leading to over- or under-weighting. Even automated counterweight mechanisms require multiple vibratory feeders to deliver counterweight plates of different specifications. This not only results in complex equipment structures and high production costs, but the vibrations generated by the vibratory feeders can also interfere with the balancing machine's detection accuracy, causing calibration deviations. More importantly, the solid counterweights protrude from the impeller surface, generating significant wind resistance during high-speed rotation. Fluctuations in wind resistance distort the raw data collected by the vibration sensor, making it difficult for the detection system to distinguish between the impeller's own unbalanced vibration and wind resistance interference vibrations, severely affecting the accuracy of the detection results. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a device and method for detecting the dynamic balance stability of a pump impeller. This device enables precise weight distribution, interference-free detection, and full-process automation of dynamic balance detection, solving the core problems of insufficient accuracy, low efficiency, and significant interference in traditional technologies.

[0006] This invention provides the following technical solution: a pump impeller dynamic balance stability performance detection device, including a base and a control panel mounted thereon, a rotatable shaft on the base driven by a motor, and the shaft is detected by a vibration sensor, the shaft is provided with an angle disk for finding the impeller imbalance point, the angle disk includes a balance disk in the middle and an angle ring with an angle engraved on its outer side, the inner edge of the balance disk is provided with a plurality of counterweight chambers arranged in a ring array, and each counterweight chamber is provided with a water valve for liquid introduction and export;

[0007] The base has a movable plate inside, and the movable plate has a docking nozzle for connecting each water valve. The movable plate is raised and lowered by an electric cylinder so that all the docking nozzles on the movable plate connect with the bottom of each water valve. Liquid is injected into the counterweight chamber at a designated position on the balance plate through the docking nozzle at a designated position to add counterweight at the designated position on the balance plate. By using liquid as counterweight, the weight of the counterweight can be precisely controlled and the wind resistance caused by the counterweight can be avoided.

[0008] The bottom of the balance disc and the top of the movable disc are provided with alignment structures for docking, which make the water valve on the balance disc and the docking nozzle on the movable disc correspond vertically.

[0009] Preferably, the bottom of the counterweight chamber is provided with a settling zone, so that the liquid is concentrated in the settling zone, and the water valve is located in the settling zone.

[0010] Preferably, the water valve includes a waterproof sleeve embedded in the bottom of the counterweight chamber. The waterproof sleeve has a slidable valve stem inside. The valve stem has a positioning ring located above the waterproof sleeve. The bottom of the valve stem extends from the bottom of the waterproof sleeve. The side of the waterproof sleeve has a ring of water guide holes. The bottom of the valve stem has a water guide structure for sealing. The connecting nozzle connects with the water guide structure to guide the counterweight liquid into the counterweight chamber.

[0011] Preferably, the water guiding structure includes a water guide nozzle installed at the bottom of the valve stem. The bottom of the valve stem is provided with a water tank for connecting the water guide nozzle. A ring of holes for drainage is provided on the side of the bottom of the valve stem. Two A-sealing rings are installed on the valve stem at positions above and below the holes. In the normal state, the water guide hole is located above the two A-sealing rings, preventing the water guide hole and the holes from communicating. When the connecting nozzle is connected to the water guide nozzle, the connecting nozzle is moved upward and pressed against the waterproof sleeve. At this time, the valve stem moves the two A-sealing rings upward and the water guide hole enters between the two A-sealing rings, allowing the holes to communicate with the water guide hole for the introduction and export of counterweight liquid.

[0012] Preferably, the water valve includes an exhaust sleeve embedded in the top of the counterweight chamber, and the top of the valve stem extends into the exhaust sleeve and abuts against the return spring. The top of the exhaust sleeve is provided with an air port, and the side of the exhaust sleeve is provided with a ring of exhaust ports. The side of the top of the valve stem is provided with an air-closing mechanism, and the connecting nozzle is connected to the water guiding structure to drive the air-closing mechanism on the valve stem to adjust the internal air pressure.

[0013] Preferably, the air-sealing mechanism includes an air groove on the top of the valve stem and an exhaust port on the side of the valve stem, with the exhaust port communicating with the air groove. Three B-seal rings are provided on the top side of the valve stem, and the exhaust port is located between the second and third B-seal rings. In the normal state, the exhaust port is located between the first and second B-seal rings, while the exhaust port is located between the second and third B-seal rings, so that the air-sealing mechanism achieves a sealed state. When the connecting nozzle is connected to the water guide nozzle, the valve stem drives the three B-seal rings on it to move upward, so that the exhaust port moves between the second and third B-seal rings, and the exhaust port and exhaust port are connected, allowing the inside and outside of the counterweight chamber to be connected for air pressure adjustment.

[0014] Preferably, the bottom of each docking nozzle is connected to a corresponding solenoid valve assembly via a pipe. The solenoid valve assembly is connected to the infusion system and the extraction system via pipes. The solenoid valve assembly controls the operation of the docking nozzle at a designated position to export and import the counterweight liquid.

[0015] Preferably, the alignment structure includes several sets of iron plates arranged in a circular array at the bottom of the balance disc, and several sets of electromagnets arranged in a circular array at the top of the movable disc. The number of electromagnets and iron plates are the same both vertically. When the electromagnets are energized, maintaining the distance between the balance disc and the movable disc, the electromagnets will attract the iron plates for alignment. Several sets of positioning sleeves are provided at the bottom of the balance disc, and several sets of needle positioning posts are installed at the top of the movable disc. Orientation is calibrated by electromagnets and iron plates, and precise positioning is achieved by inserting the needle positioning posts into the positioning sleeves, so that the connecting nozzle and the water valve are connected.

[0016] A method for detecting the dynamic balance stability performance of a pump impeller, the specific operation of which is as follows:

[0017] S1. Install the impeller of the pump body on the shaft end of the balance disc, drive the balance disc to rotate by the motor, and use a vibration sensor to detect the vibration of the shaft while the impeller is rotating to analyze the direction of impeller imbalance.

[0018] S2. Turn off the motor. Before the balance disc comes to a stop, push the movable disc upward with the electric cylinder and keep the balance disc and the movable disc at a distance. Under the locating structure, drive the balance disc to find the right position and align it with the movable disc, and complete the docking between the docking nozzle and the water valve.

[0019] S3. Control the docking nozzle at the corresponding position to introduce counterweight liquid into the counterweight chamber in the unbalanced direction. According to the analysis results, introduce the corresponding amount of counterweight liquid. Finally, the electric cylinder controls the separation of the balance plate and the moving plate.

[0020] S4. Next, continue to control the balance disc to drive the impeller to rotate and check if it is balanced. If it is not balanced, continue to repeat the above operation. If it is balanced, control the movable disc to connect with the balance disc so that the connecting nozzle can draw out the liquid in the counterweight chamber and keep the balance disc balanced.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) Compared with the shortcomings of traditional metal counterweights that “can only fix the weight and cannot be finely adjusted”, this invention uses liquid as counterweight and precisely controls the amount of liquid injected into the counterweight chamber through electromagnetic valve group, which can achieve milligram-level counterweight accuracy and ensure that the counterweight adjustment is highly matched with the actual unbalanced state of the impeller.

[0023] (2) Traditional solid counterweights generate wind resistance when the impeller rotates, and the fluctuation of wind resistance can easily lead to distortion of the detection data collected by the vibration sensor. In this invention, liquid is used as the counterweight. The liquid is completely contained in the closed counterweight chamber, and there is no additional protruding structure that generates wind resistance. This allows the vibration sensor to accurately collect the vibration signal caused by the impeller's own imbalance, and the authenticity and reliability of the detection data are significantly improved.

[0024] (3) Through the dual alignment structure of “preliminary calibration by electromagnet adsorption of iron sheet + precise positioning by needle positioning column insertion into positioning sleeve”, and with the electric cylinder driving the moving plate to lift, the azimuth alignment of the balance plate and the moving plate and the coaxial docking of the water valve and the docking nozzle can be automatically completed without manual adjustment of alignment, solving the problems of low efficiency and large deviation of traditional manual docking, and shortening the single docking time to the second level.

[0025] (4) The control panel can automatically analyze the data collected by the vibration sensor and combine the angle information fed back by the angle loop to quickly locate the impeller imbalance point; then automatically control the solenoid valve group to inject a quantitative liquid to complete the counterweight adjustment; after adjustment, the detection and verification will be automatically started again to form a closed-loop automated process of "detection → analysis → counterweight → verification". Compared with the traditional manual counterweight and multiple trial and error mode, the operation steps are greatly reduced, the detection time of a single impeller is shortened by more than 50%, and the detection error caused by human judgment error is avoided. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the angle disk and movable disk of the present invention;

[0028] Figure 3 For the present invention Figure 2 A schematic diagram of the split structure;

[0029] Figure 4 This is a schematic diagram of the bottom structure of the angle disk of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the water valve of the present invention;

[0031] Figure 6 For the present invention Figure 5 A schematic diagram of the split structure;

[0032] Figure 7 This is a schematic diagram of the conventional sealing structure of the water valve of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of the water valve after it is opened according to the present invention.

[0034] In the diagram: 1. Base; 2. Control panel; 3. Angle disc; 4. Balance disc; 5. Angle ring; 6. Counterweight chamber; 7. Water valve; 8. Movable disc; 91. Iron sheet; 92. Electromagnet; 93. Positioning sleeve; 94. Needle positioning post; 10. Connecting nozzle; 61. Settling zone; 71. Waterproof sleeve; 72. Vent sleeve; 73. Valve stem; 74. Return spring; 75. Positioning ring; 76. Water guide hole; 77. Water guide structure; 78. Air port; 79. Air-sealing mechanism; 710. Vent; 771. Water guide nozzle; 772. Water tank; 773. Hole; 774. A sealing ring; 791. Air groove; 792. Vent hole; 793. B sealing ring. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. In order to keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of known functions and known components are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0036] Please see Figure 1 The base 1 has a shock-absorbing pad (not shown) at its bottom, which can reduce the transmission of equipment vibration to the ground during the testing process and ensure the stability of its own structure. The control panel 2 is embedded in the front of the base 1 and has a built-in PLC control system and touch screen. It can display parameters such as shaft speed, vibration sensor data, and counterweight liquid flow rate in real time, and supports manual / automatic mode switching. Operators can set parameters such as detection speed and balance threshold through the panel.

[0037] The base 1 is equipped with a drive motor (not shown). The motor output is connected to the shaft via a coupling. The shaft passes through the top of the base 1 and can rotate freely. An angle plate 3 is fitted in the middle of the shaft, and a vibration sensor (a piezoelectric vibration sensor) is fixed near the impeller mounting end of the shaft. The sensor signal is transmitted to the control panel 2 via wires to collect the vibration amplitude and frequency when the impeller rotates, and then analyze the location of the imbalance point.

[0038] See Figure 3 and Figure 4 The angle disc 3 consists of a central balance disc 4 and an outer angle ring 5. The scale of the angle ring 5 can quickly locate the circumferential position of the impeller imbalance point, providing an orientation reference for subsequent counterweighting. Several sets of counterweight chambers 6 arranged in a ring around the edge of the balance disc 4, together with the movable disc 8, the docking nozzle 10, and the solenoid valve group in the base 1, constitute a complete counterweight adjustment system. When the vibration sensor detects the unbalanced vibration when the impeller rotates, the angle ring 5 locates the direction of the imbalance point, and the corresponding counterweight chamber 6 is connected to the docking nozzle 10 of the movable disc 8 through the water valve 7. The solenoid valve group controls the infusion system to inject a quantitative amount of liquid into the counterweight chamber 6.

[0039] The core advantage of this combination is that it uses liquid as a counterweight. Compared with traditional metal counterweights, the injection volume can be precisely controlled by the solenoid valve group to achieve milligram-level counterweight accuracy. At the same time, the liquid is concentrated in the settling zone 61 at the bottom of the counterweight chamber 6, which facilitates the liquid discharge. Moreover, there is no wind resistance generated by solid counterweights, which eliminates the interference of wind resistance on vibration detection results and ensures that the detection data is true and reliable.

[0040] The movable plate 8 is located inside the base 1. It is a circular metal plate with 8 sets of docking nozzles 10 evenly installed on the top along the circumference, which is the same number as the counterweight chamber 6. Each set of docking nozzles 10 is a tubular structure with an open top and a sealing ring on the inner wall, which can fit tightly with the water guide nozzle 771 to prevent liquid leakage.

[0041] The bottom of each connector 10 is connected to a solenoid valve assembly (not shown) via an independent pipe. The solenoid valve assembly is integrated inside the base 1 and is divided into an "infusion branch" and an "extraction branch".

[0042] Infusion branch: It is connected to an external storage tank containing deionized water through a pipeline. The branch is equipped with a flow sensor and a miniature infusion pump, which can accurately control the volume of liquid introduced into the counterweight chamber 6 with an accuracy of up to 0.1mL.

[0043] Extraction branch: Connected to the waste liquid recovery tank through a pipeline, the branch is equipped with a miniature liquid pump, which is used to extract the liquid in the counterweight chamber 6 after the balance test is completed, so that the balance plate 4 can be restored to the initial balance state.

[0044] The bottom of the movable plate 8 is connected to the output end of the electric cylinder (not shown). The electric cylinder can drive the movable plate 8 to rise and fall vertically, so as to connect and disconnect the docking nozzle 10 and the water valve 7.

[0045] See Figure 5 and Figure 6 The water valve 7 is key to achieving precise liquid control, and includes a waterproof sleeve 71, an air vent sleeve 72, a valve stem 73, a return spring 74, a water guiding structure 77, and an air-tightening mechanism 79. Its specific structure and working principle are as follows:

[0046] Waterproof sleeve 71: It is embedded in the bottom of the counterweight chamber 6 and is made of corrosion-resistant engineering plastic. The inner wall is smooth to ensure smooth sliding of valve stem 73. A ring of water guide holes 76 is opened on the side of the sleeve near the top. The water guide holes 76 are connected to the inside of the counterweight chamber 6 for liquid inlet and outlet.

[0047] Exhaust sleeve 72: Installed at the top center of the counterweight chamber 6, coaxial with the waterproof sleeve 71, hollow inside and with an air port 78 at the top and an exhaust port 710 on the side; the exhaust sleeve 72 contains a return spring 74, the lower end of the return spring 74 abuts against the top of the valve stem 73, providing a downward return force for the valve stem 73.

[0048] Valve stem 73: passes through the waterproof sleeve 71 and the vent sleeve 72, and can slide axially; a positioning ring 75 is provided in the middle of the stem body to limit the downward stroke of the valve stem 73 and prevent the water guiding structure 77 from detaching from the waterproof sleeve 71.

[0049] Water guiding structure 77: Located at the bottom of valve stem 73, including water guide nozzle 771, water tank 772 and hole 773: Water guide nozzle 771 is a conical structure, which facilitates precise docking with docking nozzle 10; Water tank 772 is a blind hole opened at the bottom of valve stem 73, which communicates with hole 773 on the side; Two A sealing rings 774 are fitted on the outer side of the bottom of valve stem 73. In the normal state when not docked, water guide hole 76 is located above the two A sealing rings 774, and hole 773 is sealed by the lower A sealing ring 774, so liquid cannot enter or exit; When docking nozzle 10 pushes water guide nozzle 771 upward, valve stem 73 moves upward, water guide hole 76 enters between the two A sealing rings 774, hole 773 and water guide hole 76 are connected, and liquid can enter counterweight chamber 6 through docking nozzle 10 → water guide nozzle 771 → water tank 772 → hole 773 → water guide hole 76, or be discharged in the opposite direction.

[0050] Air-sealing mechanism 79: Located at the top of valve stem 73, it includes air groove 791, vent hole 792, and three B-seal rings 793. Air groove 791 is an annular groove at the top of valve stem 73, communicating with vent hole 792. Vent hole 792 is located between the second and third B-seal rings 793. Under normal conditions, vent port 710 of vent sleeve 72 is located between the first and second B-seal rings 793, and air-sealing mechanism 79 seals to prevent liquid leakage in counterweight chamber 6. When valve stem 73 moves upward, vent hole 792 moves with valve stem 73 to the corresponding position of vent port 710. Counterweight chamber 6 is connected to the outside through vent hole 792 → air groove 791 → air port 78, balancing the air pressure in the chamber and ensuring smooth liquid introduction or export to avoid air resistance causing poor liquid flow.

[0051] See Figure 7 and Figure 8 The waterproof sleeve 71, valve stem 73, and water guiding structure 77 of the water valve 7, together with the docking nozzle 10 of the movable disc 8, form a coordinated mechanism of "docking-conduction-sealing". Under normal conditions, the valve stem 73 is kept in a low position under the action of the return spring 74. The two A-sealing rings 774 of the water guiding structure 77 isolate the water guiding hole 76 of the waterproof sleeve 71 from the hole 773 of the valve stem 73, thereby sealing the counterweight chamber 6 and preventing liquid leakage. When the movable disc 8 moves upward, the docking nozzle 10 lifts the water guiding nozzle 771, causing the valve stem 73 to move upward, so that the water guiding hole 76 enters between the two A-sealing rings 774. The hole 773 and the water guiding hole 76 are connected, and liquid can be injected into the counterweight chamber 6 through the docking nozzle 10, the water guiding nozzle 771, the water chamber 772, the hole 773, and the water guiding hole 76.

[0052] Simultaneously, the vent sleeve 72 at the top of the water valve 7 cooperates with the air-sealing mechanism 79 of the valve stem 73 to solve the problem of air pressure obstruction during liquid injection: when the valve stem 73 moves upward, the vent hole 792 of the air-sealing mechanism 79 and the vent port 710 of the vent sleeve 72 are connected, and the air in the counterweight chamber 6 is discharged through the vent hole 792, the vent port 710, and the air port 78, ensuring smooth liquid injection; after injection, the valve stem 73 returns to its original position, and the vent hole 792 and the vent port 710 are isolated to prevent liquid leakage from the venting channel. This structural combination achieves synchronous control of "liquid flow conduction" and "air pressure balance," ensuring the stability of counterweight adjustment.

[0053] The iron plate 91 and positioning sleeve 93 at the bottom of the balance disc 4, together with the electromagnet 92, needle positioning post 94, and electric cylinder driving the movement of the movable disc 8, form a dual positioning system. Before the balance disc 4 comes to a stop, the electric cylinder pushes the movable disc 8 upward. First, the electromagnet 92 is energized to attract the iron plate 91 at the corresponding position, achieving preliminary orientation calibration between the balance disc 4 and the movable disc 8, ensuring that the water valve 7 and the docking nozzle 10 are roughly aligned. Then, the movable disc 8 continues to move upward, and the needle positioning post 94 is inserted into the positioning sleeve 93 to complete precise positioning, making each docking nozzle 10 completely coaxially connected with the corresponding water valve 7, avoiding liquid leakage or poor conductivity caused by docking deviation.

[0054] This combination solves the problems of low efficiency and large deviation in traditional manual docking: the attraction force of the electromagnet 92 can quickly correct the slight deflection of the balance disk 4, and the rigid fit between the positioning sleeve 93 and the needle positioning post 94 ensures millimeter-level docking accuracy. The two work together to make the docking process unnecessary for manual intervention, greatly improving the efficiency and reliability of operation.

[0055] Dynamic balance detection and adjustment process

[0056] Imbalance point detection stage

[0057] The impeller of the pump to be tested is installed on the shaft end of the balance disc 4. The motor is started through the control panel 2, driving the shaft to rotate the balance disc 4 and the impeller. During the rotation, the vibration sensor on the shaft collects vibration data in real time and transmits the data to the analysis system of the control panel 2. The angle ring 5 provides real-time feedback on the rotation angle of the balance disc 4. Combined with the angle at which the vibration data peak occurs, the circumferential direction of the impeller imbalance point is quickly located, providing a directional basis for subsequent counterweighting.

[0058] counterweight adjustment stage

[0059] After the motor is turned off, before the balance disc 4 stops rotating, the electric cylinder pushes the movable disc 8 upward: first, the electromagnet 92 is energized to attract the iron piece 91, completing the initial orientation calibration; then the needle positioning post 94 is inserted into the positioning sleeve 93 to achieve precise docking of the water valve 7 and the docking nozzle 10. At the same time, the docking nozzle 10 lifts the water guide nozzle 771, so that the water valve 7 is connected and the exhaust channel is opened.

[0060] Control panel 2 calculates the required amount of counterweight liquid based on the vibration amplitude of the imbalance point, and then controls the solenoid valve group corresponding to the imbalance point to open the liquid delivery system. The liquid is injected into the corresponding counterweight chamber 6 through the docking nozzle 10 and water valve 7. After injection, the electric cylinder drives the movable plate 8 to move down, the valve stem 73 is reset under the action of the return spring 74, and the water valve 7 and the exhaust channel close synchronously, completing one counterweight adjustment.

[0061] Balance verification and reset phase

[0062] The motor is restarted to drive the impeller to rotate, and the vibration sensor collects vibration data a second time. If the vibration data is lower than the set threshold, it means that the impeller has reached dynamic balance; if the vibration data still exceeds the standard, the above "detection-counterweight" process is repeated until the balance is achieved.

[0063] After the balance verification is completed, the movable disc 8 is moved up again and connected to the water valve 7 by the control panel 2. At this time, the solenoid valve group is switched to the extraction system, and the liquid in each counterweight chamber 6 is extracted through the docking nozzle 10, so that the balance disc 4 is restored to the initial balance state, so as to carry out the next impeller test.

[0064] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A device for detecting the dynamic balance stability of a pump impeller, comprising a base (1) and a control panel (2) thereon, wherein a rotatable shaft on the base (1) is driven by a motor and the shaft is detected by a vibration sensor, and an angle disk (3) for finding the impeller imbalance point is provided on the shaft, characterized in that: The angle disk (3) includes a balance disk (4) in the middle and an angle ring (5) with an angle engraved on its outer side. The inner edge of the balance disk (4) is provided with a number of counterweight chambers (6) arranged in a ring array. Each counterweight chamber (6) is provided with a water valve (7) for liquid introduction and export. The base (1) is provided with a movable plate (8) inside, and the movable plate (8) is provided with a docking nozzle (10) for connecting each water valve (7). The movable plate (8) is raised and lowered by an electric cylinder so that all the docking nozzles (10) on the movable plate (8) are connected to the bottom of each water valve (7). Liquid is injected into the counterweight chamber (6) at a specified position on the balance plate (4) through the docking nozzle (10) at a specified position, and counterweight is applied to the specified position on the balance plate (4). The liquid is used as a counterweight to accurately control the weight of the counterweight and avoid the counterweight causing wind resistance. The water valve (7) includes a waterproof sleeve (71) embedded in the bottom of the counterweight chamber (6). The inside of the waterproof sleeve (71) is provided with a slidable valve stem (73). The valve stem (73) is provided with a positioning ring (75) located above the waterproof sleeve (71). The bottom of the valve stem (73) extends from the bottom of the waterproof sleeve (71). The side of the waterproof sleeve (71) is provided with a ring of water guide holes (76). The bottom of the valve stem (73) is provided with a water guide structure (77) for sealing. The docking nozzle (10) docks with the water guide structure (77) to introduce the counterweight liquid into the counterweight chamber (6).

2. The pump impeller dynamic balance stability testing device according to claim 1, characterized in that: The bottom of the counterweight chamber (6) is provided with a settling zone (61) so that the liquid is concentrated in the settling zone (61), and the water valve (7) is set in the settling zone (61).

3. The pump impeller dynamic balance stability testing device according to claim 1, characterized in that: The water guiding structure (77) includes a water guide nozzle (771) installed at the bottom of the valve stem (73). The bottom of the valve stem (73) is provided with a water tank (772) for connecting the water guide nozzle (771). The side of the bottom of the valve stem (73) is provided with a ring of holes (773) for drainage. Two A-sealing rings (774) are installed on the valve stem (73) at the upper and lower positions of the holes (773). In normal state, the water guide hole (76) is located at the two A-sealing rings. Above the ring (774), the water guide hole (76) and the hole (773) cannot be connected. When the docking nozzle (10) is connected to the water guide nozzle (771), the docking nozzle (10) is moved upward and pressed against the waterproof sleeve (71). At this time, the valve stem (73) moves the two A sealing rings (774) on it upward and makes the water guide hole (76) enter between the two A sealing rings (774), so that the hole (773) and the water guide hole (76) are connected, and the counterweight liquid is introduced and discharged.

4. The pump impeller dynamic balance stability testing device according to claim 1, characterized in that: The water valve (7) includes an exhaust sleeve (72) embedded in the top of the counterweight chamber (6), and the top of the valve stem (73) extends into the exhaust sleeve (72) and abuts against the return spring (74). The top of the exhaust sleeve (72) is provided with an air port (78), and the side of the exhaust sleeve (72) is provided with a ring of exhaust ports (710). The side of the top of the valve stem (73) is provided with an air-closing mechanism (79). The connecting nozzle (10) is connected to the water guiding structure (77) to drive the air-closing mechanism (79) on the valve stem (73) to adjust the internal air pressure.

5. The pump impeller dynamic balance stability testing device according to claim 4, characterized in that: The air-sealing mechanism (79) includes an air groove (791) on the top of the valve stem (73) and an exhaust port (792) on the side of the valve stem (73), with the exhaust port (792) communicating with the air groove (791). Three B-seal rings (793) are provided on the top side of the valve stem (73), and the exhaust port (792) is located between the second and third B-seal rings (793). In normal operation, the exhaust port (710) is located between the first and second B-seal rings (793). The vent (792) is located between the second and third B sealing rings (793), so that the air-sealing mechanism (79) reaches a sealed state. When the docking nozzle (10) docks with the water guide nozzle (771), the valve stem (73) drives the three B sealing rings (793) on it to move upward, so that the vent (710) moves between the second and third B sealing rings (793). The vent (792) and the vent (710) are connected, so that the counterweight chamber (6) is connected inside and outside for air pressure adjustment.

6. The pump impeller dynamic balance stability testing device according to claim 1, characterized in that: The bottom of each docking nozzle (10) is connected to the corresponding solenoid valve group through a pipe. The solenoid valve group is connected to the infusion system and the extraction system through pipes. The solenoid valve group controls the docking nozzle (10) at the specified position to conduct and operate, and to export and import the counterweight liquid.

7. The pump impeller dynamic balance stability testing device according to claim 1, characterized in that: The bottom of the balance disc (4) and the top of the movable disc (8) are provided with a docking alignment structure. The docking structure makes the water valve (7) on the balance disc (4) and the docking nozzle (10) on the movable disc (8) correspond vertically. The docking structure includes several sets of iron plates (91) arranged in a ring array at the bottom of the balance disc (4), and several sets of electromagnets (92) arranged in a ring array at the top of the movable disc (8). The number of electromagnets (92) and iron plates (91) are the same vertically. After the electromagnet (92) is energized, the distance between the balance disk (4) and the movable disk (8) is maintained. The electromagnet (92) will attract the iron piece (91) for alignment. The bottom of the balance disk (4) is provided with several sets of positioning sleeves (93), and the top of the movable disk (8) is provided with several sets of needle positioning posts (94). The orientation is calibrated by the electromagnet (92) and the iron piece (91), and the needle positioning post (94) is inserted into the positioning sleeve (93) for precise positioning, so that the docking nozzle (10) and the water valve (7) are connected.

8. A method for detecting the dynamic balance stability performance of a pump impeller, characterized in that, The pump impeller dynamic balance stability testing device according to any one of claims 1-7 is operated as follows: S1. Install the impeller of the pump body on the shaft end of the balance disc (4), drive the balance disc (4) to rotate by the motor, and use the vibration sensor to detect the vibration of the shaft under the rotation of the impeller and analyze the direction of impeller imbalance. S2. Turn off the motor. Before the balance disc (4) stops, push the movable disc (8) upward by the electric cylinder and keep the balance disc (4) and the movable disc (8) at a distance. The balance disc (4) finds the right position and aligns with the movable disc (8), and completes the docking between the docking nozzle (10) and the water valve (7). S3. Control the docking nozzle (10) at the corresponding position to introduce counterweight liquid into the counterweight chamber (6) in the unbalanced direction. According to the analysis results, introduce the corresponding amount of counterweight liquid. Finally, the electric cylinder controls the balance plate (4) to separate from the moving plate (8). S4. Next, continue to control the balance disk (4) to drive the impeller to rotate and check whether it is balanced. If it is not balanced, continue to repeat the above operation. If it is balanced, control the movable disk (8) to connect with the balance disk (4) so ​​that the docking nozzle (10) will draw out the liquid in the counterweight chamber (6) so that the balance disk (4) is balanced as a whole.

Images