Dynamic balance detection system of fan impeller

Abstract

The invention relates to the technical field of impeller detection, discloses a dynamic balance detection system of a fan impeller, and solves the problem of inconvenience in actual operation caused by repeated start and stop of a test host and surface treatment of the impeller in dynamic balance detection of a conventional impeller. The unbalance amount of the impeller and the corresponding direction of the impeller are detected through the analysis system, measured data are sent to the control system, the control system controls the liquid separation unit to rotate to the corresponding angle, the balance weight liquid with the weight corresponding to the unbalance amount is discharged, then the balance weight liquid flows into the corresponding balance weight cavity through the flow guide cavity under the action of centrifugal force, and the balance weight liquid is discharged. By simulating counterweight compensation on a plurality of point positions on the surface during rotation of the impeller, required compensation weights of the plurality of point positions are obtained, then impeller surface treatment is performed in a concentrated manner, the time for repeatedly starting and stopping a test host and the step of treating the surface of the impeller for multiple times are saved, and the time for repairing the impeller is greatly saved.

Description

Technical Field

[0001] The invention relates to the technical field of impeller detection, and in particular to a dynamic balance detection system for a fan impeller. Background Art

[0002] The dynamic balancing test of the impeller is a technology used to ensure that the rotating mechanical parts (such as the impeller) remain balanced during rotation. The dynamic balancing test system for the fan impeller includes a test host and an analysis system. The test host is generally composed of an electric motor, a balancing shaft (hereinafter referred to as a rotor), bearings, and sensors. The impeller is installed on the surface of the rotor, and the motor drives the rotor to rotate. The sensor accurately captures the tiny vibration signal generated by the rotor during rotation, and transmits the electrical signal to the analysis system. The algorithm extracts the frequency components related to the imbalance, thereby determining the size and position of the imbalance.

[0003] After detecting the impeller is unbalanced, it is necessary to perform surface treatment according to the unbalanced part of the impeller, which includes coating with glue to increase weight or cutting to reduce weight. The weight increase and weight reduction parts are generally symmetrical. In actual operation, the dynamic balancing test and surface treatment of the impeller often need to be performed alternately for multiple times. The reason is that the imbalance of the impeller is not completely symmetrical, so the position of weight increase or weight reduction also needs to be adjusted according to the specific imbalance. This means that different degrees of weight increase or weight reduction are required at different positions of the impeller to ensure that the impeller is balanced when rotating. The analysis system cooperates with the test host in a single test. Generally, it only provides the imbalance in one direction. Therefore, the actual test requires repeated starting and stopping of the test host and surface treatment of the impeller, which makes it inconvenient in actual operation. Summary of the invention

[0004] The purpose of the present invention is to provide a dynamic balance detection system for a fan impeller, which solves the problem that in the dynamic balance detection of a conventional impeller, repeated starting and stopping of a test host and surface treatment of the impeller are required, which causes inconvenience in actual operation.

[0005] To achieve the above object, the present invention provides the following technical solution: a dynamic balance detection system for a fan impeller, comprising a test host and an analysis system, wherein the test host has a rotor for rotating the impeller, and further comprises a control system and a weight-increasing mechanism coaxially arranged on the surface of the rotor, wherein the weight-increasing mechanism comprises: A storage component is coaxially mounted on the surface of the rotor, wherein a weight liquid is stored inside the storage component; A directional liquid-dispensing assembly movably assembled on the annular surface of the storage assembly, the directional liquid-dispensing assembly comprising an annular cover fixed on the outer surface of the storage assembly, and a liquid-dispensing unit annularly movable inside the annular cover, a plurality of alignment holes circumferentially opened on the outer surface of the annular cover, the liquid-dispensing unit being used to quantitatively discharge the weight liquid at the corresponding alignment holes; A counterweight ring is arranged near the side surface of the impeller, wherein a plurality of counterweight cavities which are not connected to each other are opened in the circumferential direction inside the counterweight ring; A flow guide cover connected between the counterweight ring and the annular cover, wherein a plurality of flow guide cavities are circumferentially opened inside the flow guide cover, wherein the flow guide cavities are used to connect the counterweight cavity and the alignment hole, and the plurality of the flow guide cavities, the counterweight cavity and the alignment hole correspond to each other one by one; The control system controls the liquid dispensing unit to discharge corresponding weight of the balancing liquid through electrical signals based on the measurement data of the analysis system, and then discharges the balancing liquid into the balancing liquid cavity through the corresponding guide cavity.

[0006] As a further description of the above technical solution: the liquid separation unit includes an annular block rotatably installed on the inner side of the annular cover, one side of the annular block is coaxially fixedly connected with a gear ring, and a control motor for driving the gear ring to rotate, the output end of the control motor is provided with a gear meshing with the gear ring, the control motor is fixedly installed on the outer surface of the storage component, a metering pump is fixedly installed inside the annular block, the liquid inlet end of the metering pump is connected to the inner side of the storage component, and the liquid outlet end of the metering pump is movably connected to the alignment hole.

[0007] As a further description of the above technical solution: a liquid inlet cavity is opened on one side of the annular block close to the storage component, the liquid inlet end of the metering pump is connected to the inner side of the liquid inlet cavity, the liquid outlet end of the metering pump is connected to a rubber tube, an extrusion block is extruded on one side of the rubber tube, and a second spring is provided on one side of the extrusion block to push it to the surface of the rubber tube.

[0008] As a further description of the above technical solution: the storage component includes an inner cylinder fixedly assembled on the rotor surface, the outer surface of the inner cylinder is fixedly connected to the outer cylinder, an annular cavity with an opening on one side is formed between the inner cylinder and the outer cylinder, the annular cavity is used to store the balancing liquid, a piston disk for closing the opening of the annular cavity is slidably arranged on the surface of the inner cylinder, a fixing ring is fixedly arranged on the side of the inner cylinder away from the annular cavity, a first push spring is arranged between the piston disk and the fixing ring to push the piston disk to move into the annular cavity, and an injection valve connected to the annular cavity is also arranged on the outer surface of the outer cylinder.

[0009] As a further description of the above technical solution: a plurality of liquid outlets connected to the annular cavity are axially opened on the surface of the outer cylinder, and the liquid outlets are movably connected to the liquid inlet cavity. The surfaces of the outer cylinder in sliding contact with the annular block are also respectively provided with sealing rings and electrode rings. The sealing rings are used for rotating and sealing the gap between the outer cylinder and the annular block. The position of the annular block corresponding to the electrode ring is also provided with a brush that slides and is in electrical contact with the electrode ring. The brush is used to power the metering pump.

[0010] As a further description of the above technical solution: a sealing component for movably closing the entrance of the guide chamber connected to the counterweight chamber is provided, the sealing component includes a sealing plate sliding on the inner wall of the counterweight chamber, the movable direction points to the direction of the rotor, the sealing plate movably blocks the entrance of the guide chamber and the counterweight chamber, the two sides of the sealing plate are fixedly connected with sliding rods along the movable direction of the sealing plate, the sliding rods are movably inserted into the counterweight ring, one end of the sliding rod is fixedly connected with a counterweight block B, and the surface of the sliding rod is also sleeved with a third spring that urges the sealing plate to close the entrance of the guide chamber and the counterweight chamber under normal conditions; The inlet of the flow guide cavity connected to the counterweight cavity is close to the direction where the rotor is located.

[0011] As a further description of the above technical solution: the outer annular surface of the counterweight ring is slidably and sealedly connected to a collecting cover, the collecting cover is provided with an annular collecting chamber on the side close to the counterweight ring, the inner wall of the counterweight chamber close to the collecting chamber is equipped with a one-way valve, the counterweight chamber is connected to the inner side of the collecting chamber in one direction through the one-way valve, a plurality of closing blocks are axially arranged on the inner wall of the collecting chamber, the plurality of closing blocks cover the one-way valve in one-to-one correspondence, a drain valve is provided on the outer surface of the collecting cover, two positioning nuts B are fixedly connected to the side surface of the collecting cover, the counterweight ring is fixedly connected with a positioning nut A on the side close to the positioning nut B, a bolt is provided in the positioning nut A and is threadedly fixedly connected to the single positioning nut B.

[0012] As a further description of the above technical solution: a ventilation cavity is opened on one side of the diversion cavity and is connected with it for multiple times, and the angle between the ventilation cavity and the connecting inlet of the diversion cavity and the flow direction of the counterweight liquid in the diversion cavity is set to be an acute angle.

[0013] As a further description of the above technical solution: the deflector cover includes a first composite plate and a second composite plate that are tightly combined, the deflector cavity is opened on the surface of the first composite plate or the second composite plate, and a plurality of support frames for rigidly supporting the counterweight ring are fixedly arranged circumferentially on the side surface of the annular cover.

[0014] As a further description of the above technical solution: a counterweight block A and a battery block are fixedly arranged on the side of the outer cylinder away from the control motor, the battery block is electrically connected to the control motor, and the battery block is also electrically connected to the electrode ring.

[0015] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: the unbalance amount of the impeller and its corresponding direction are detected by the analysis system, and the measurement data is sent to the control system, the control system controls the liquid separation unit to rotate to the corresponding angle, discharges the balancing liquid of the weight corresponding to the unbalance amount, and then the balancing liquid flows into the corresponding balancing cavity through the guide cavity under the action of centrifugal force, and the balancing compensation is performed on multiple points on the surface by simulating the rotation of the impeller, and the required compensation weights of multiple points are obtained, and then the impeller surface is treated centrally, saving the time of repeatedly starting and stopping the test host, and the steps of treating the impeller surface multiple times, thereby greatly saving the time of repairing the impeller; for one side of the guide cavity, a ventilation cavity connected to it is opened, the ventilation cavity promotes the air circulation in the guide cavity, accelerates the flow of the balancing liquid in the guide cavity, and makes the balancing liquid flow faster and in sufficient quantity to the corresponding balancing cavity, further reducing the time used for detection, and avoiding the inconvenience of some balancing liquid entering the balancing cavity in time due to air pressure reasons, causing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the first cross-sectional structure of the weight-increasing mechanism of the present invention; Figure 3 It is a schematic diagram of the second cross-sectional structure of the weight-increasing mechanism of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of A in the figure; Figure 5 For the present invention Figure 3 Schematic diagram of B in the figure; Figure 6 It is a schematic diagram of the exploded structure of the weight-increasing mechanism of the present invention; Figure 7 A schematic diagram of the local anatomical structure of the storage component of the present invention; Figure 8 It is a schematic diagram of the blown-up structure of the deflector cover of the present invention; Fig. 9 For the present invention Figure 8 Schematic diagram of C in the middle; Fig.10 It is a schematic diagram of the planar structure of the flow guide cavity and the ventilation cavity of the present invention.

[0017] In the figure: 10, weight-increasing mechanism; 20, storage assembly; 21, outer cylinder; 211, liquid outlet; 212, sealing ring; 213, electrode ring; 22, inner cylinder; 23, piston plate; 24, first push spring; 25, fixing ring; 26, liquid injection valve; 27, counterweight block A; 28, battery block; 30, directional liquid separation assembly; 31, annular cover; 311, alignment hole; 312, support frame; 32, annular block; 321, liquid inlet chamber; 33, metering pump; 331, brush; 332, rubber tube; 34, Extrusion block; 35, gear ring; 36, control motor; 40, deflector cover; 401, first joint plate; 402, second joint plate; 41, deflector chamber; 411, ventilation chamber; 50, counterweight ring; 51, counterweight chamber; 52, closing assembly; 521, sealing plate; 522, sliding rod; 523, third spring; 524, counterweight block B; 53, one-way valve; 54, positioning nut A; 55, bolt; 60, collecting cover; 61, collecting chamber; 62, closing block; 63, drain valve; 64, positioning nut B. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0019] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0020] In the impeller dynamic balancing detection operation, there are multiple unbalanced points on the impeller surface, and they are not on the same rotating plane. The geometric center of gravity of the multiple unbalanced points corresponds to the position of the unbalanced amount. The unbalanced amount is located inside the impeller, and the digging or filling point for the unbalanced amount is on the impeller surface. It does not coincide with the position of the unbalanced amount in the axial direction of the impeller. Therefore, after the actual digging or filling, new unbalanced amounts will still appear. Therefore, in actual operation, it is necessary to start and stop the machine many times, and to carry out digging or filling many times, which is inconvenient.

[0021] Combination Figure 1-Figure 10 The dynamic balance detection system of the fan impeller includes a test host and an analysis system. The test host has a rotor for rotating the impeller, a control system, and a weight-increasing mechanism 10 coaxially arranged on the surface of the rotor. The weight-increasing mechanism 10 includes: A storage assembly 20 is coaxially mounted on the rotor surface, and a weight liquid is stored in the storage assembly 20; A directional liquid dispensing assembly 30 is movably assembled on the annular surface of the storage assembly 20, and the directional liquid dispensing assembly 30 includes an annular cover 31 fixed on the outer surface of the storage assembly 20, and a liquid dispensing unit that moves annularly inside the annular cover 31. A plurality of alignment holes 311 are circumferentially opened on the outer surface of the annular cover 31, and the liquid dispensing unit is used to quantitatively discharge the weight liquid at the corresponding alignment holes 311; A counterweight ring 50 is arranged near the side surface of the impeller, and a plurality of counterweight cavities 51 which are not connected to each other are circumferentially opened inside the counterweight ring 50; A flow guide cover 40 connected between the counterweight ring 50 and the annular cover 31, wherein a plurality of flow guide cavities 41 are circumferentially provided inside the flow guide cover 40, and the flow guide cavities 41 are used to connect the counterweight cavity 51 and the alignment hole 311, and the plurality of flow guide cavities 41, the counterweight cavity 51, and the alignment hole 311 correspond to each other one by one; Based on the measurement data of the analysis system, the control system controls the liquid dispensing unit through an electrical signal to discharge the corresponding weight of the balancing liquid, and then discharges it into the balancing weight cavity 51 through the corresponding guide cavity 41 .

[0022] In view of the fact that the actual detection of the impeller dynamic balance mentioned above requires repeated starting and stopping of the test host and surface treatment of the impeller, which makes the actual operation inconvenient, the present embodiment first sets the storage assembly 20 and the impeller to be detected coaxially on the rotor surface, and then starts the rotor to rotate, so that the counterweight ring 50 and the impeller rotate coaxially. During the rotation, the analysis system detects the unbalance amount of the impeller and its corresponding direction, and sends the measurement data to the control system, and then the control system controls the liquid separation unit to rotate to the corresponding angle in the annular cover 31, and then discharges the counterweight liquid of the corresponding weight to the unbalance amount, and then the counterweight liquid flows into the corresponding counterweight cavity 51 through the guide cavity 41 under the action of centrifugal force, so as to complete the counterweight compensation for the impeller unbalance amount. The analysis system will then continue to analyze the dynamic balance test of the impeller. When a new imbalance occurs, the above steps are repeated until the dynamic balance test of the impeller meets the requirements. Subsequently, the weight of the corresponding weight increase or weight reduction treatment required for the corresponding direction of the impeller surface can be obtained based on the angle of the weight liquid discharged by the liquid separation unit and the weight of the weight liquid discharged. The device simulates the weight compensation of multiple points on the surface during the rotation of the impeller, thereby obtaining the required compensation weight of multiple points, and then centrally treats the impeller surface. This saves the time of repeatedly starting and stopping the test host and the steps of repeatedly treating the impeller surface, thereby greatly saving the time of repairing the impeller, reducing the number of times the test host is repeatedly started and stopped, and increasing the service life of the test host to a certain extent.

[0023] Further, the liquid separation unit includes an annular block 32 rotatably mounted inside the annular cover 31, a gear ring 35 is coaxially fixedly connected to one side of the annular block 32, and a control motor 36 for driving the gear ring 35 to rotate, a gear is provided at the output end of the control motor 36 to mesh with the gear ring 35, the control motor 36 is fixedly mounted on the outer surface of the storage assembly 20, a metering pump 33 is fixedly mounted inside the annular block 32, a liquid inlet end of the metering pump 33 is connected to the inner side of the storage assembly 20, and a liquid outlet end of the metering pump 33 is movably connected to the alignment hole 311; The control motor 36 is preferably a servo motor, and the metering pump 33 is preferably a Comet micro pump. The control motor 36 is first used to drive the annular block 32 to rotate inside the annular cover 31, and the metering pump 33 is controlled to be connected to the alignment hole 311 in the corresponding orientation, and then the metering pump 33 is controlled to output the corresponding weight of the balancing liquid.

[0024] Furthermore, a liquid inlet cavity 321 is provided on one side of the annular block 32 close to the storage assembly 20, a liquid inlet end of the metering pump 33 is connected to the inner side of the liquid inlet cavity 321, a liquid outlet end of the metering pump 33 is connected to a rubber tube 332, a squeeze block 34 is provided on one side of the rubber tube 332, and a second spring is provided on one side of the squeeze block 34 to push it to squeeze against the surface of the rubber tube 332; By setting the liquid inlet chamber 321, the liquid inlet end of the metering pump 33 is at a height with the outer surface of the storage assembly 20, so that the liquid can better enter the inner side of the metering pump 33, and the rubber tube 332 at the liquid outlet end of the metering pump 33 is elastically squeezed by the squeezing block 34. The purpose of setting it is to squeeze the rubber tube 332 by the squeezing block 34 so that the liquid outlet end of the metering pump 33 is closed to prevent the remaining balancing liquid in the liquid outlet pipe of the metering pump 33 from being thrown into the guide chamber 41 under the action of centrifugal force, and then entering the interior of the balancing weight chamber 51, resulting in errors in the simulated quantitative balancing weight. When the metering pump 33 is working and pumping out the liquid, the squeezing block 34 can be pushed to one side by the pressure of the liquid, so that the balancing weight liquid can be discharged smoothly. After the metering pump 33 stops working, the squeezing block 34 will restore the clamping and sealing of the rubber tube 332 under the action of the second spring.

[0025] Further, the storage assembly 20 includes an inner cylinder 22 fixedly assembled on the surface of the rotor, the outer surface of the inner cylinder 22 is fixedly connected to the outer cylinder 21, an annular cavity with one side open is formed between the inner cylinder 22 and the outer cylinder 21, the annular cavity is used to store the weight liquid, a piston disk 23 for closing the opening of the annular cavity is slidably arranged on the surface of the inner cylinder 22, a fixing ring 25 is fixedly arranged on the side of the inner cylinder 22 away from the annular cavity, a first push spring 24 is arranged between the piston disk 23 and the fixing ring 25 to push the piston disk 23 to move into the annular cavity, and a liquid injection valve 26 connected to the annular cavity is also arranged on the outer surface of the outer cylinder 21; Furthermore, the weight liquid is stored in the annular cavity, and the interior is filled with the weight liquid without air. When the weight liquid is discharged through the metering pump 33, the volume of the weight liquid in the annular cavity will decrease. At this time, the first push spring 24 squeezes the piston plate 23 to change the volume of the annular cavity so as to automatically adapt to the change of the weight liquid volume in the annular cavity. In this way, the weight liquid in the annular cavity is fixed in state to prevent it from rotating unbalancedly with the rotor. The injection valve 26 is used to add the weight liquid into the annular cavity. The weight liquid includes water, and the inner wall of the cavity structure for water flow is covered with hydrophobic material.

[0026] Combination Figure 3-Figure 7 In the previous embodiment, a plurality of liquid outlets 211 connected to the annular cavity are axially opened on the surface of the outer cylinder 21, and the liquid outlets 211 are movably connected to the liquid inlet cavity 321. The surfaces of the outer cylinder 21 and the annular block 32 that are in sliding contact are also provided with sealing rings 212 and electrode rings 213, respectively. The sealing ring 212 is used to rotate and seal the gap between the outer cylinder 21 and the annular block 32. The position of the annular block 32 corresponding to the electrode ring 213 is also provided with a brush 331 that is in sliding and electrically contacting with the electrode ring 213. The brush 331 is used to supply power to the metering pump 33. A sealing assembly 52 for movably closing the entrance of the guide chamber 41 connecting to the counterweight chamber 51 is provided. The sealing assembly 52 includes a sealing plate 521 sliding on the inner wall of the counterweight chamber 51, and the moving direction points to the direction of the rotor. The sealing plate 521 movably blocks the entrance of the guide chamber 41 connecting to the counterweight chamber 51. Slide rods 522 along the moving direction of the sealing plate 521 are fixedly connected on both sides of the sealing plate 521. The slide rods 522 are movably inserted into the counterweight ring 50. A counterweight block B524 is fixedly connected to one end of the slide rod 522. A third spring 523 is also sleeved on the surface of the slide rod 522 to force the sealing plate 521 to close the entrance of the guide chamber 41 connecting to the counterweight chamber 51 under normal conditions. The inlet of the flow guide cavity 41 connected to the counterweight cavity 51 is close to the direction where the rotor is located; When the counterweight ring 50 rotates with the rotor, the counterweight block B524, under the action of centrifugal force, overcomes the elastic force of the third spring 523 and lifts up the sealing plate 521 in the direction of the centrifugal force through the slide rod 522, so that the guide chamber 41 and the counterweight chamber 51 are connected, so that the counterweight liquid can smoothly enter the counterweight chamber 51 through the guide chamber 41. When the counterweight ring 50 reduces the speed of the rotor, the centrifugal force of the counterweight block B524 gradually decreases. By setting the elastic limit of the third spring 523 accordingly, the counterweight water is still collected at the top of the counterweight chamber 51 under the action of centrifugal force. The third spring 523 overcomes the reduced centrifugal force of the counterweight block B524, so that the sealing plate 521 re-seals the entrance connecting the guide chamber 41 to the counterweight chamber 51. In this way, after the counterweight ring 50 stops rotating, the counterweight liquid in the counterweight chamber 51 will not flow back into the guide chamber 41, making cleaning difficult and affecting the accuracy of subsequent counterweight compensation.

[0027] Combination Figure 3-Figure 9 In the previous embodiment, the outer annular surface of the counterweight ring 50 is slidably and sealedly connected with a collecting cover 60, and an annular collecting chamber 61 is provided on the collecting cover 60 near the counterweight ring 50. The inner wall of the counterweight chamber 51 near the collecting chamber 61 is equipped with a one-way valve 53, and the counterweight chamber 51 is connected to the inner side of the collecting chamber 61 in one direction through the one-way valve 53. A plurality of closing blocks 62 are axially arranged on the inner wall of the collecting chamber 61, and the plurality of closing blocks 62 cover the one-way valve 53 in one-to-one correspondence. A drain valve 63 is provided on the outer surface of the collecting cover 60, and two positioning nuts B64 are fixedly connected to the side surface of the collecting cover 60. A positioning nut A54 is fixedly connected to the side of the counterweight ring 50 near the positioning nut B64, and a bolt 55 is provided in the positioning nut A54 and is threadedly fixedly connected to the single positioning nut B64. The collecting cover 60 is rotated on the arc surface of the counterweight ring 50 so that the two positioning nuts B64 are respectively docked with the positioning nuts A54, and the bolts 55 are used to fix the docking position of the positioning nuts B64 and the positioning nuts A54. When one positioning nut B64 is docked with the positioning nut A54, the closing block 62 covers the top of the one-way valve 53 to cut off the connection between the counterweight chamber 51 and the collecting chamber 61, which is used in the counterweight simulation compensation of the impeller by the counterweight ring 50; and when the other positioning nut B64 is docked with the positioning nut A54, the counterweight chamber 51 is connected with the collecting chamber 61 through the one-way valve 53. At this time, by driving the counterweight ring 50 to rotate again, the counterweight liquid in the multiple counterweight chambers 51 will flow into the collecting chamber 61 through the one-way valve 53 for collection. Finally, the rotation of the counterweight ring 50 is stopped, and the counterweight liquid collected in the collecting chamber 61 can be discharged through the drain valve 63.

[0028] Combination Fig.10In the previous embodiment, a ventilation cavity 411 is provided on one side of the flow guiding cavity 41 and is connected to the ventilation cavity 411 for multiple times. The angle between the ventilation cavity 411 and the connecting inlet of the flow guiding cavity 41 and the flow direction of the weight liquid in the flow guiding cavity 41 is set to be an acute and obtuse angle. When the counterweight liquid flows in the guide chamber 41 due to centrifugal force, the ventilation chamber 411 can promote the circulation of air in the guide chamber 41 to prevent the air pressure from causing the counterweight liquid to flow slowly in the guide chamber 41. The setting of the connecting angle between the ventilation chamber 411 and the guide chamber 41 prevents the counterweight liquid from accidentally entering the ventilation chamber 411 during flow, thereby blocking the circulation of air in the guide chamber 41.

[0029] Combination Figure 6-Figure 8 In the previous embodiment, the air guide cover 40 includes a first plywood 401 and a second plywood 402 that are tightly combined, the air guide cavity 41 is opened on the surface of the first plywood 401 or the second plywood 402, and a plurality of support frames 312 for rigidly supporting the counterweight ring 50 are fixedly arranged on the side surface of the annular cover 31 in a circumferential direction; When processing and producing the guide cover 40, a guide cavity 41 for the flow of the counterweight liquid is first opened on the surface of the first plywood 401 or the second plywood 402, and covered with a hydrophobic material, and then the first plywood 401 and the second plywood 402 are tightly merged, thereby simplifying the steps and difficulty of producing the guide cover 40. The support frame 312 is preferably made of a rigid alloy material to provide rigid support for the counterweight ring 50.

[0030] Combination Figure 3-Figure 6 In the previous embodiment, a counterweight block A27 and a battery block 28 are fixedly provided on the side of the outer cylinder 21 away from the control motor 36. The battery block 28 and the control motor 36 are electrically connected. The battery block 28 is also conductively connected to the electrode ring 213. The battery block 28 is used to supply power to the rotating control motor 36, and also supplies power to the metering pump 33 through the conductive contact between the electrode ring 213 and the brush 331. The counterweight block A27 is used for dynamic balance of the overall balancing device.

[0031] Working principle: firstly, the storage component 20 and the impeller to be tested are coaxially arranged on the rotor surface, and then the positioning nut B64 is adjusted to dock with the positioning nut A54 so that the closing block 62 covers the top of the one-way valve 53, and the communication between the counterweight chamber 51 and the collecting chamber 61 is cut off. Then, the rotor is started to rotate so that the counterweight ring 50 and the impeller rotate coaxially. During the rotation, the analysis system detects the unbalance amount of the impeller and its corresponding direction, and sends the measurement data to the control system. Then, the control system controls the control motor 36 to drive the annular block 32 to rotate to the corresponding angle in the annular cover 31, and then the metering pump 33 discharges the counterweight liquid of the weight corresponding to the unbalance amount. Then, the counterweight liquid flows into the corresponding counterweight chamber 51 through the guide chamber 41 under the action of centrifugal force, so as to complete the counterweight compensation for the unbalance amount of the impeller. Then, the analysis system continues to analyze the dynamic balance detection of the impeller. When a new unbalance amount appears, the above steps are repeated until the dynamic balance detection of the impeller meets the requirements. When it is necessary to discharge the weight liquid in the weight chamber 51, by docking another positioning nut B64 with the positioning nut A54, the weight chamber 51 is connected to the collecting chamber 61 through the one-way valve 53, and the weight ring 50 is driven to rotate again. At this time, the weight liquid in multiple weight chambers 51 flows into the collecting chamber 61 through the one-way valve 53 under the action of centrifugal force to be collected. Finally, the rotation of the weight ring 50 is stopped, and the weight liquid collected in the collecting chamber 61 is discharged through the drain valve 63.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic balance detection system for a fan impeller, comprising a test host and an analysis system, wherein the test host has a rotor for rotating the impeller, and is characterized in that: It also includes a control system and a weight-increasing mechanism (10) coaxially arranged on the surface of the rotor, wherein the weight-increasing mechanism (10) includes: A storage component (20) is coaxially mounted on the surface of the rotor, wherein a weight liquid is stored inside the storage component (20); A directional liquid dispensing component (30) movably mounted on the annular surface of the storage component (20), the directional liquid dispensing component (30) comprising an annular cover (31) fixed to the outer surface of the storage component (20), and a liquid dispensing unit that moves in an annular manner inside the annular cover (31), a plurality of alignment holes (311) being circumferentially formed on the outer surface of the annular cover (31), the liquid dispensing unit being used to quantitatively discharge the weight liquid from the corresponding alignment holes (311); A counterweight ring (50) is arranged adjacent to the side surface of the impeller, wherein a plurality of counterweight cavities (51) which are not connected to each other are circumferentially formed inside the counterweight ring (50); a flow guide cover (40) connected between the counterweight ring (50) and the annular cover (31), wherein a plurality of flow guide cavities (41) are circumferentially formed inside the flow guide cover (40), wherein the flow guide cavities (41) are used to connect the counterweight cavity (51) and the alignment hole (311), and the plurality of flow guide cavities (41), the counterweight cavity (51), and the alignment hole (311) correspond to each other one by one; The control system controls the liquid dispensing unit through an electrical signal based on the measurement data of the analysis system to discharge a corresponding weight of the balancing liquid, and then discharges the balancing liquid into the balancing liquid cavity (51) through the corresponding flow guide cavity (41).

2. The dynamic balance detection system for a fan impeller according to claim 1, characterized in that: The liquid separation unit comprises an annular block (32) rotatably mounted inside an annular cover (31), a gear ring (35) being coaxially fixedly connected to one side of the annular block (32), and a control motor (36) for driving the gear ring (35) to rotate, a gear being provided at an output end of the control motor (36) and meshingly connected to the gear ring (35), the control motor (36) being fixedly mounted on the outer surface of the storage assembly (20), a metering pump (33) being fixedly mounted inside the annular block (32), a liquid inlet end of the metering pump (33) being connected to the inner side of the storage assembly (20), and a liquid outlet end of the metering pump (33) being movably connected to the alignment hole (311).

3. The dynamic balance detection system for a fan impeller according to claim 2, characterized in that: A liquid inlet cavity (321) is provided on a side of the annular block (32) close to the storage assembly (20); a liquid inlet end of the metering pump (33) is connected to the inside of the liquid inlet cavity (321); a liquid outlet end of the metering pump (33) is connected to a rubber tube (332); an extrusion block (34) is extruded on one side of the rubber tube (332); and a second spring is provided on one side of the extrusion block (34) for pushing it to be extruded toward the surface of the rubber tube (332).

4. The dynamic balance detection system for a fan impeller according to claim 3, characterized in that: The storage assembly (20) comprises an inner cylinder (22) fixedly mounted on the surface of the rotor, the outer surface of the inner cylinder (22) being fixedly connected to the outer cylinder (21), an annular cavity with an opening on one side being formed between the inner cylinder (22) and the outer cylinder (21), the annular cavity being used to store a weight liquid, a piston disk (23) being slidably disposed on the surface of the inner cylinder (22) for closing the opening of the annular cavity, a fixing ring (25) being fixedly disposed on the side of the inner cylinder (22) away from the annular cavity, a first push spring (24) being disposed between the piston disk (23) and the fixing ring (25) for pushing the piston disk (23) to move into the annular cavity, and a liquid injection valve (26) being connected to the annular cavity being further disposed on the outer surface of the outer cylinder (21).

5. The dynamic balance detection system for a fan impeller according to claim 4, characterized in that: A plurality of liquid outlets (211) connected to the annular cavity are axially provided on the surface of the outer cylinder (21), the liquid outlets (211) being movably connected to the liquid inlet cavity (321), and sealing rings (212) and electrode rings (213) being respectively provided on the surfaces of the outer cylinder (21) and the annular block (32) in sliding contact, the sealing ring (212) being used to rotate and seal the gap between the outer cylinder (21) and the annular block (32), and brushes (331) being in sliding and electrically contacting with the electrode ring (213) being provided at the position of the annular block (32) corresponding to the electrode ring (213), the brushes (331) being used to supply power to the metering pump (33).

6. The dynamic balance detection system for a fan impeller according to claim 1, characterized in that: A sealing component (52) for movably closing the entrance of the guide cavity (41) connected to the counterweight cavity (51) is provided at the entrance, the sealing component (52) comprising a sealing plate (521) sliding on the inner wall of the counterweight cavity (51), the movable direction pointing to the direction of the rotor, the sealing plate (521) movably blocks the entrance of the guide cavity (41) and the counterweight cavity (51), the two sides of the sealing plate (521) are fixedly connected with sliding rods (522) along the movable direction of the sealing plate (521), the sliding rods (522) are movably inserted into the counterweight ring (50), one end of the sliding rod (522) is fixedly connected with a counterweight block B (524), and the surface of the sliding rod (522) is also sleeved with a third spring (523) for urging the sealing plate (521) to close the entrance of the guide cavity (41) and the counterweight cavity (51) under normal conditions; The inlet of the flow guide cavity (41) connected to the counterweight cavity (51) is close to the direction where the rotor is located.

7. The dynamic balance detection system for a fan impeller according to claim 6, characterized in that: The outer annular surface of the counterweight ring (50) is slidably and sealingly connected to a collecting cover (60); an annular collecting chamber (61) is provided on the collecting cover (60) near the counterweight ring (50); a one-way valve (53) is mounted on the inner wall of the counterweight chamber (51) near the collecting chamber (61); the counterweight chamber (51) is in one-way communication with the inner side of the collecting chamber (61) via the one-way valve (53); a plurality of closing blocks (62) are axially arranged on the inner wall of the collecting chamber (61); the plurality of closing blocks (62) cover the one-way valve (53) in a one-to-one correspondence; a drain valve (63) is provided on the outer surface of the collecting cover (60); two positioning nuts B (64) are fixedly connected to the side surface of the collecting cover (60); a positioning nut A (54) is fixedly connected to the side of the counterweight ring (50) near the positioning nut B (64); a bolt (55) is provided inside the positioning nut A (54) and is threadedly fixedly connected to the single positioning nut B (64).

8. The dynamic balance detection system for a fan impeller according to claim 7, characterized in that: A ventilation cavity (411) is provided on one side of the guide cavity (41) and is connected thereto for multiple times. The angle between the ventilation cavity (411) and the connecting inlet of the guide cavity (41) and the flow direction of the weight liquid in the guide cavity (41) is set to be an acute angle.

9. The dynamic balance detection system for a fan impeller according to claim 1, characterized in that: The air guide cover (40) comprises a first joint plate (401) and a second joint plate (402) which are tightly combined, the air guide cavity (41) is opened on the surface of the first joint plate (401) or the second joint plate (402), and a plurality of support frames (312) for rigidly supporting the counterweight ring (50) are fixedly arranged circumferentially on the side surface of the annular cover (31).

10. The dynamic balance detection system for a fan impeller according to claim 5, characterized in that: A counterweight block A (27) and a battery block (28) are fixedly arranged on one side of the outer cylinder (21) away from the control motor (36); the battery block (28) and the control motor (36) are electrically connected, and the battery block (28) is also electrically connected to the electrode ring (213).

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