Range hood impeller dynamic balance detection tool and method

Abstract

The invention discloses a tool and method for detecting the dynamic balance of an impeller of a range hood, and the tool comprises a table-board, the table-board is provided with a detection clamp used for placing the impeller and a volute, the detection clamp is provided with a rotating shaft and a motor, the impeller is detachably connected to the rotating shaft, the motor drives the rotating shaft to rotate, and the motor drives the impeller to rotate. The table top is also provided with a first positioning part and a second positioning part; the first positioning part can move up, down, left and right relative to the detection clamp and is propped against the top of the volute; the second positioning part can perform up-down and left-right movement adjustment relative to the detection clamp, and the second positioning part abuts against and supports the bottom of the volute; the third positioning part can be moved and adjusted back and forth relative to the detection clamp, and the third positioning part abuts against the side part of the volute; and the volute is jointly locked and positioned on the detection fixture through the first positioning part, the second positioning part and the third positioning part. According to the invention, a similar three-axial movement positioning structure is formed to position volutes with different sizes, and a balance test is carried out through a balancing machine.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and in particular to a dynamic balance detection tool and method for a range hood impeller. Background Art

[0002] The power source of the range hood is usually a multi-blade centrifugal fan, which is mainly composed of a spiral volute, a multi-blade centrifugal impeller and a motor. Its working principle is that when the impeller rotates, it accelerates the airflow at the fan inlet, and then the airflow is collected by the volute and discharged after deceleration and pressure increase. During the use of the range hood, impurities such as grease and water vapor are easily adhered to the surface of the impeller, which will cause the dynamic balance performance of the impeller to deteriorate, causing the impeller to produce greater vibration and abnormal noise when working, and then affect the fan frame through the transmission path, causing it to vibrate, ultimately reducing the user experience. Therefore, it is necessary to perform dynamic balancing test and calibration on the impeller. The impeller of the prior art measures the imbalance amount and position on the balancing machine, and balances the imbalance amount of the impeller by the matching method to achieve calibration. The test and calibration method follows the industry standard JB / T 9101-1999, that is, the impeller is fixed on the fixture, and the relevant parameters and standard values ​​are set according to the test procedure requirements of the balancing machine. The speed of the impeller is generally set to 1200rpm. If the measured imbalance data exceeds the standard value, it is necessary to add the corresponding counterweight sheet to the corresponding position of the impeller to achieve counterweighting. The counterweight operation usually uses glue to stick the counterweight sheet on the position of the impeller imbalance, and then repeat the test and counterweighting until the data meets the standard value requirements. At present, in the test process, the impeller is usually placed alone on the fixture for the imbalance test. During the rotation of the impeller, only the imbalance caused by the radial and axial runout of the impeller's own structure is considered, while the imbalance effect of the airflow load on the impeller is ignored. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned technology and to provide a tool and method for detecting the dynamic balance of a range hood impeller.

[0004] The present invention provides a dynamic balance detection tool for a range hood impeller, comprising a table, the table is provided with a detection fixture for placing an impeller and a volute, the detection fixture is provided with a rotating shaft and a motor, the impeller is detachably connected to the rotating shaft, the motor drives the rotating shaft to rotate, and the table is also provided with:

[0005] A first positioning portion that can be adjusted to move up, down, left, and right relative to the detection fixture, the first positioning portion abuts against the top of the volute;

[0006] A second positioning portion that can be adjusted to move up, down, left, and right relative to the detection fixture, the second positioning portion abuts against and supports the bottom of the volute;

[0007] A third positioning portion that can be adjusted to move forward and backward relative to the detection fixture, the third positioning portion abutting against the side of the volute;

[0008] The volute is locked and positioned on the detection fixture by the first positioning portion, the second positioning portion and the third positioning portion.

[0009] Preferably, the table top includes a horizontal surface and a support frame connected to the horizontal surface, the support frame is provided with a fixed plate 1 which moves up and down relative to the detection fixture, the second positioning portion is slidably connected to the fixed plate 1, the third positioning portion is slidably connected to the fixed plate 1, the fixed plate 1 is provided with a fixed plate 2, and the first positioning portion is slidably connected to the fixed plate 2.

[0010] Further optimized, the second positioning portion includes two second adjustment arms, which are respectively located at the left and right radial ends of the bottom surface of the volute, one end of each second adjustment arm is slidably connected to the fixing plate 1 by the cooperation of the slider and the slide rail, and the other end is supported as a support end at the radial ends of the bottom surface of the volute;

[0011] The third positioning portion includes an adjusting rod screwed to the fixing plate 1, the tail end of the adjusting rod serves as a hand-screw end, and the top end serves as a contact end against the rear side wall of the volute;

[0012] The first positioning portion includes two first adjustment arms, one end of each first adjustment arm is slidably connected to the second fixing plate through the cooperation of a slider and a slide rail, and the other end serves as a downward pressing end corresponding to the supporting end of the second adjustment arm and abuts against the top surface of the volute.

[0013] Further optimized, a first support rod is provided between the first adjustment arm and the second fixing plate, one end of the first support rod is fixedly connected to the first adjustment arm, and the other end is slidably connected to the second fixing plate, so that the first support rod slides along the second fixing plate with the first adjustment arm;

[0014] A second support rod is provided between the second adjustment arm and the first fixing plate. One end of the second support rod is fixedly connected to the second adjustment arm, and the other end is slidably connected to the first fixing plate, so that the second support rod slides along the first fixing plate with the second adjustment arm.

[0015] According to further optimization, a guide groove 1 extending left and right is provided on the fixing plate 1 and the fixing plate 2, and one end of the first support rod and the second support rod are connected to the corresponding guide groove 1 through a locking bolt 1, and one end of the locking bolt 1 is connected to the end of the first support rod and the second support rod, and the other end passes through the guide groove 1 and is screwed to the locking nut, so that the first support rod and the second support rod are slidably connected in the guide groove 1 and can be locked in position by the locking nut.

[0016] Further optimization is that a movable mounting arm is provided on the downward pressing end of the first adjusting arm, one end of the mounting arm is connected to the first adjusting arm and a locking structure for locking the mounting arm is provided between the mounting arm and the first adjusting arm, and the other end of the mounting arm is provided with a downward pressing head which is pressed down to the top surface of the volute.

[0017] Further optimization, the pressure head includes a connecting rod and a rubber head located at the bottom end of the connecting rod, the end of the mounting arm is bent to form a guide groove 2 extending left and right, the connecting rod is vertically inserted into the guide groove 2, and two positioning plates are sleeved on the connecting rod, and the two positioning plates respectively abut against the upper and lower end surfaces of the guide groove 2. A nut is screwed on the connecting rod to tighten the positioning plate, and the side edges of each positioning plate are bent downward to form a limit with the edge of the mounting arm.

[0018] Further optimization, the supporting end of the second adjusting arm and the contact end of the third adjusting arm that contact the volute are both provided with rubber pads; the pressing head of the first adjusting arm is made of rubber or a rubber pad is provided at the bottom of the pressing head.

[0019] The tooling includes a detection fixture, and the impeller and the volute are installed on the detection fixture at the same time. The first positioning portion, the second positioning portion and the third positioning portion contact the top, bottom and side surfaces of the volute respectively to form a clamping positioning. The positions of the first positioning portion, the second positioning portion and the third positioning portion relative to the volute are adjustable to form a similar three-axial movement to position volutes of different sizes, so that fan systems of different sizes can be detected. Not only is the structure simple and easy to operate, but the positioning is stable and the versatility is strong, which greatly improves the test efficiency.

[0020] The present invention also provides a range hood impeller dynamic balance detection method, which is characterized by comprising the following steps:

[0021] S1, installing the volute with the impeller on any one of the range hood impeller dynamic balancing detection tools as claimed in claims 1 to 8, and turning on the balancing machine to control the rotation of the impeller;

[0022] S2, control the impeller to rotate twice, rotate twice to relative positions, and the balancing machine measures the position and size of the unbalanced part according to the unbalanced vibration signal generated by the two rotations;

[0023] S3, calculating the unbalanced phase angle and unbalanced amount, i.e. the position and mass to be compensated, according to the phase difference and amplitude difference of the unbalanced vibration signal;

[0024] S4, calculating the radius value of the unbalanced position from the impeller center according to the unbalanced phase angle, and calculating the mass of the counterweight according to the unbalanced amount and the radius value;

[0025] S5, obtaining the position of the counterweight along the direction of the radius at the opposite position of the unbalanced phase angle, and performing a counterweight operation;

[0026] S6: After the weight balancing is completed, repeat S2 and S3 to verify the weight balancing effect;

[0027] S7, if the unbalance amount is less than or equal to the preset standard value, the process ends; if the unbalance amount is less than the preset standard value, S5 is repeated until the measured unbalance amount is less than or equal to the preset standard value.

[0028] Preferably, in S1, after the volute and the impeller are installed, an air inlet ring is installed at the air inlet of the volute, and finally the rotation of the impeller is controlled by a balancing machine.

[0029] This detection method performs a dynamic balancing test on the entire fan system, namely the impeller, volute and motor, which is closer to the actual use scenario of the range hood. At the same time, it calibrates the unbalanced force on the impeller caused by the airflow and structural behavior tolerance, such as asymmetric airflow, or impeller imbalance caused by improper impeller structure and assembly, or impeller imbalance caused by improper motor stator and rotor structure and assembly. The size and position of the unbalanced mass are determined by measuring the unbalanced vibration signal, and then the size and position of the compensating mass that needs to be counterweighted are calculated based on the phase difference and amplitude difference of the unbalanced vibration signal. Ultimately, the dynamic balancing accuracy of the impeller during actual rotation is greatly improved, the vibration and noise of the impeller are reduced, and the service life of the range hood is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the overall structure diagram of the inspection tooling after the impeller and volute are installed;

[0031] Figure 2 It is the overall structure diagram of the inspection tooling;

[0032] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0033] Figure 4 This is another perspective of the overall structure of the inspection tooling;

[0034] Figure 5 This is another perspective of the overall structure of the inspection tooling.

[0035] In the figure: 1. impeller; 2. volute; 3. testing fixture; 4. rotating shaft; 5. horizontal platform; 6. support frame; 7. fixing plate 1; 8. fixing plate 2; 9. guide groove 1; 10. locking bolt 1;

[0036] 11. First positioning part; 11-1. First adjusting arm; 11-2. First supporting rod; 11-3. Mounting arm; 11-4. Locking structure; 11-5. Pressing head; 11-5-1. Connecting rod; 11-5-2. Rubber head; 11-5-3. Second guide groove; 11-5-4. Positioning sheet; 11-6. Slide rail 1; 11-7. Slider 1;

[0037] 12. Second positioning part; 12-1. Second adjusting arm; 12-2. Second supporting rod; 12-3. Second slide rail; 12-4. Second slide block;

[0038] 13. Third positioning part; 13-1. Adjustment rod; 13-2. Hand-rotation end; 13-3. Resistance end;

[0039] 14. Guide groove three; 15. Locking bolt three; 16. Screw pair. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying 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 belong to the scope of protection of the present invention.

[0041] The present invention provides a dynamic balancing detection tool for a range hood fan impeller, which comprises a table top, on which a detection fixture 3 is provided. In this embodiment, a rotating shaft 4 is provided on the detection fixture 3, and a motor for driving the rotating shaft 4 to rotate is also provided on the detection fixture 3. The motor is connected to a balancing machine, and the rotation of the motor is controlled by the balancing machine, thereby controlling the number of rotations and the rotation speed of the impeller 1.

[0042] The table top is provided with a first positioning portion 11, a second positioning portion 12 and a third positioning portion 13. The table top includes a horizontal table surface 5 and a support frame 6 connected to the horizontal table surface 5. The support frame 6 is perpendicular to the horizontal table surface 5. A fixing plate 17 is provided on the support frame 6. A fixing plate 28 is provided on the fixing plate 7. Both the fixing plate 17 and the fixing plate 28 are perpendicular to the horizontal table surface 5. A lead screw pair 16 is provided between the fixing plate 7 and the support frame 6. The lead screw of the lead screw pair 16 is rotatably connected to the support frame 6 and is perpendicular to the horizontal table surface 5. The nut of the lead screw pair 16 is connected to the fixing plate 7. Lead screw pairs 16 are provided on both sides of the fixing plate 7. Each lead screw pair 16 has two nuts, which are respectively connected to the upper and lower positions of the fixing plate 7. That is, the four corners of the fixing plate 7 are matched with the lead screw through nuts, so that the fixing plate 7 can stably move up and down along the support frame 6, that is, the fixed plate 7 can be adjusted relative to the support frame 6 in the up and down direction.

[0043] The fixing plate 28 is slidably connected to the fixing plate 17. The fixing plate 17 is provided with a guide groove 3 14 extending up and down. Connecting seats are symmetrically provided on both sides of the back of the fixing plate 28. Two locking bolts 3 15 are distributed above and below each connecting seat. The locking bolts 3 15 pass through the guide groove 3 14 and are screwed with locking nuts, so that the fixing plate 28 is slidably connected to the guide groove 3 14 of the fixing plate 17 and is locked in place by the locking nuts. A connecting block is provided between the nut of the screw pair 16 and the fixing plate 17. A through hole is provided on the connecting block. The nut is connected to the connecting block through the through hole. The side of the connecting block is connected to the fixing plate 17. The connecting block or the fixing plate 17 is designed as an integral unit. The screw pair 16 structure is adopted to isolate the vibration between the fixing plate 17 and the support frame 6, so that the positioning of each positioning part is more stable, which is conducive to detection.

[0044] The second positioning portion 12 includes two second adjustment arms 12-1, and the two second adjustment arms 12-1 are symmetrically located at the left and right radial ends of the bottom surface of the volute 2. One end of the second adjustment arm 12-1 is slidably connected to the fixed plate 7 by the cooperation of the slider and the slide rail, that is, the fixed plate 7 is provided with a slide rail 12-3, the slide rail 12-3 is parallel to the horizontal platform 5 and extends left and right, and the slide rail 12-3 is slidably matched with a slider 12-4, the second adjustment arm 12-1 is fixed to the slider 12-4, and the other end of the second adjustment arm 12-1 is supported as a supporting end at the radial ends of the bottom surface of the volute 2.

[0045] In this embodiment, the second adjusting arm 12-1 is parallel to the horizontal platform 5, and the slider 12-4 is fixed to the upper surface of one end of the second adjusting arm 12-1. The groove body of the slider 12-4 is located at the top of the slider 12-4, and the slide rail 12-3 is located at the bottom end of the fixed plate 7 and extends left and right. The slider 12-4 cooperates with the slide rail 12-3 through the groove body to form a sliding connection. A rubber block is provided on the upper surface of the other end of the second adjusting arm 12-1 as a supporting end. The bottom surface of the rubber block is fixed to the upper surface of the second adjusting arm 12-1, and the top surface of the rubber block supports and rests on the bottom surface of the volute 2, that is, the rubber block supports the volute 2 from bottom to top, so that the two ends of the horizontal second adjusting arm 12-1 are in contact from bottom to top, so that the two ends are in balance, and the horizontal sliding of the second adjusting arm 12-1 is more stable.

[0046] The first positioning part 11 includes two first adjustment arms 11-1, which are symmetrically located at the left and right radial ends of the top surface of the volute 2. One end of the first adjustment arm 11-1 is also slidably connected to the fixing plate 2 8 by the cooperation of the slider and the slide rail.

[0047] That is, a slide rail 11-6 is provided on the fixed plate 28, and the slide rail 11-6 is parallel to the horizontal platform surface 5 and extends left and right. A slider 11-7 is slidably matched on the slide rail 11-6. The first adjusting arm 11-1 is fixed to the slider 11-7, so that the first adjusting arm 11-1 can slide back and forth horizontally along the fixed plate 28. The other end of the first adjusting arm 11-1 serves as a downward pressing end to contact and press down the top surface of the volute 2. The downward pressing end of the first adjusting arm 11-1 and the supporting end of the second adjusting arm 12-1 correspond to each other up and down respectively.

[0048] A second support rod 12-2 is provided between the second adjustment arm 12-1 and the fixed plate 7, one end of the second support rod 12-2 is fixedly connected to the central position of the second adjustment arm 12-1, and the other end is slidably connected to the fixed plate 7. The sliding mode between the second support rod 12-2 and the fixed plate 7 adopts the form of a guide groove and a guide block, that is, the fixed plate 7 is provided with a guide groove 9, and the guide groove 9 is consistent with the extension direction of the slide rail. A locking bolt 10 is provided at the end of the second support rod 12-2, one end of the locking bolt 10 is connected to the end of the second support rod 12-2, and the other end passes through the guide groove 9 and is screwed A locking nut is connected, so that the second support rod 12-2 is slidably connected to the guide groove 9 of the fixed plate 7 and can be locked in place by the locking nut; a first support rod 11-2 is provided between the first adjusting arm 11-1 and the fixed plate 8, and the structure and connection method of the first support rod 11-2 are the same as the second support rod 12-2, so that the first support rod 11-2 is slidably connected to the guide groove 9 of the fixed plate 8 and can be locked in place by the locking nut; the first support rod 11-2 and the second support rod 12-2 play a guiding and stabilizing role in the sliding of the first adjusting arm 11-1 and the second adjusting arm 12-1.

[0049] It should be noted that the movement of the sliders of the first adjusting arm 11 - 1 and the second adjusting arm 12 - 1 may be driven manually or automatically by setting a motor.

[0050] The third positioning portion 13 includes an adjusting rod 13-1, and the outer peripheral wall of the adjusting rod 13-1 is provided with a thread, that is, the adjusting rod 13-1 adopts a screw structure, a screw hole is opened on the fixing plate 7, and the adjusting rod 13-1 is screwed into the screw hole. The tail end of the adjusting rod 13-1 serves as a hand-screw end 13-2, and the top end of the adjusting rod 13-1 passes through the screw hole as a contact end 13-3 against the side wall of the volute 2. The adjusting rod 13-1 is located between the two first adjusting arms 11-1 or the two second adjusting arms 12-1. The first adjusting arm 11-1 is symmetrically pressed down to the top surface of the volute 2, and the second adjusting arm 12-1 is symmetrically supported on the bottom surface of the volute 2, and the adjusting rod 13-1 contacts the rear side surface of the volute 2, that is, the volute 2 is locked and positioned on the detection fixture 3 by the first positioning portion 11, the second positioning portion 12 and the third positioning portion 13.

[0051] A movable mounting arm 11-3 is provided on the downward pressing end of the first adjusting arm 11-1, one end of the mounting arm 11-3 is connected to the first adjusting arm 11-1 and a locking structure 11-4 for locking the mounting arm 11-3 is provided between the mounting arm 11-3 and the first adjusting arm 11-1, and the other end of the mounting arm 11-3 is provided with a downward pressing head 11-5 pressed down to the top surface of the volute 2, and the mounting arm 11-3 can lock the downward pressing head 11-5 through the locking structure 11-4, so that the downward pressing head 11-5 is locked in the downward pressing position.

[0052] Furthermore, the pressure head 11-5 includes a connecting rod 11-5-1 and a rubber head 11-5-2 located at the bottom end of the connecting rod 11-5-1. The end of the mounting arm 11-3 is bent to form a guide groove 11-5-3 extending left and right. The upper and lower ends of the guide groove 11-5-3 are open. The connecting rod 11-5-1 is vertically inserted into the guide groove 11-5-3. The outer peripheral wall of the connecting rod 11-5-1 is provided with an external thread. The connecting rod 11-5-1 is sleeved with a There are two positioning plates 11-5-4, which respectively abut against the upper and lower end surfaces of the second guide groove 11-5-3. A nut is screwed on the connecting rod 11-5-1 to tighten the positioning plates 11-5-4. The sides of the two positioning plates 11-5-4 are bent in the direction of the second guide groove 11-5-3 to form a snap limit with the edge of the mounting arm 11-3, so that the lower pressure head 11-5 can be stably installed on the mounting arm 11-3 and is convenient for loading and unloading.

[0053] The above tooling has a simple structure, is easy to load and unload and position the impeller 1 and the volute 2, and is applicable to impellers 1 and volutes 2 of different sizes, which is very convenient.

[0054] The present invention also provides a range hood impeller dynamic balance detection method, comprising the following steps:

[0055] S1, install the volute 2 with the impeller 1 on the above-mentioned detection fixture 3, the impeller 1 cooperates with the rotating shaft 4, and the motor is connected to the balancing machine. The balancing machine is provided with a dynamic balancing test program. The balancing machine controls the impeller 1 to rotate, and the rotation speed is usually equal to the normal working speed of the range hood impeller 1. In this step, an air inlet ring can be installed on the volute 2, which can more accurately simulate the actual working scene of the impeller 1.

[0056] S2, control the impeller 1 to rotate twice, and the two rotations are respectively rotated to relative positions, that is, to the positions at both ends of the diameter of the impeller 1. Because when there is an unbalanced mass in a mechanical system, the unbalanced mass will generate torque during the rotation process, and at the same time generate vibration and noise. The two rotations are convenient for accurately sensing the unbalanced vibration signal, and there is no need to continuously rotate and sample to take the average value. The sensor on the balancing machine measures the position and size of the unbalanced part according to the unbalanced vibration signal generated by the two rotations.

[0057] It should be noted that a sensor can be set on the detection fixture or the rotor of the motor to detect the vibration caused by imbalance. The sensor can be an acceleration sensor, a velocity sensor or a displacement sensor. After the sensor converts the sensed unbalanced vibration signal into an electrical signal, it is collected through a data acquisition system (such as a data acquisition card, a data acquisition instrument, etc.). The spectrum analysis technology is used to convert the unbalanced vibration signal from the time domain to the frequency domain, and the frequency component of the vibration signal is analyzed. The unbalanced vibration signal is usually manifested in the spectrum diagram as an amplitude with a prominent peak relative to the motor speed frequency, thereby determining the phase difference and amplitude difference of the unbalanced vibration signal.

[0058] The acceleration sensor detects the difference in rotational acceleration caused by unbalanced vibration when the impeller rotates twice;

[0059] The speed sensor senses and detects the speed difference caused by unbalanced vibration when the impeller rotates twice;

[0060] The displacement sensor senses and detects the position difference caused by unbalanced vibration when the impeller rotates twice. In other words, the unbalanced vibration signal can be an acceleration, velocity or displacement signal, which can be selected and applied according to actual conditions.

[0061] S3, the test program calculates the unbalanced phase angle φ and the unbalanced amount U, i.e. the position and mass to be compensated, according to the phase difference and amplitude difference of the unbalanced vibration signal;

[0062] S4, calculate the radius r of the unbalanced position from the center of the impeller 1 according to the unbalanced phase angle, that is, the distance from the center of mass of the unbalanced position to the central axis of the impeller 1, and calculate the mass M of the counterweight according to the unbalanced amount and the radius value, and the calculation formula is M=U / r;

[0063] S5, obtaining the position of the counterweight along the direction of the radius at the opposite position of the unbalanced phase angle, and performing the counterweight operation. The counterweight is usually a metal insert, the mass and shape of which are customized according to actual needs, and the shape and size of which cannot interfere with the rotation of the impeller 1. The metal insert is inserted into the root or end of the blade of the impeller 1 to form a fixation;

[0064] S6, after the weight balancing is completed, the unbalanced vibration signal is re-detected to verify the weight balancing effect;

[0065] S7, if the unbalance amount is less than or equal to the preset standard value, the process ends; if the unbalance amount is less than the preset standard value, S5 is repeated until the measured unbalance amount is less than or equal to the preset standard value.

[0066] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. The dynamic balance detection tool for the range hood impeller is characterized by: The invention comprises a table top, wherein the table top is provided with a detection fixture (3) for placing an impeller (1) and a volute (2), wherein the detection fixture (3) comprises a rotating shaft (4) and a motor, wherein the impeller (1) is detachably connected to the rotating shaft (4), and the motor drives the rotating shaft (4) to rotate, and the table top is also provided with: A first positioning portion (11) that is movable up, down, left, and right relative to the detection fixture (3), the first positioning portion (11) being against the top of the volute (2); A second positioning portion (12) capable of being adjusted to move up, down, left, and right relative to the detection fixture (3), the second positioning portion (12) abutting against and supporting the bottom of the volute (2); A third positioning portion (13) capable of being adjusted to move forward and backward relative to the detection fixture (3), wherein the third positioning portion (13) abuts against a side of the volute (2); The volute (2) is locked and positioned on the detection fixture (3) through the first positioning portion (11), the second positioning portion (12) and the third positioning portion (13).

2. The range hood impeller dynamic balance detection tooling according to claim 1, characterized in that: The table top comprises a horizontal table top (5) and a support frame (6) connected to the horizontal table top (5); a fixing plate (7) is provided on the support frame (6) and is movable up and down relative to the detection fixture (3); the second positioning portion (12) is slidably connected to the fixing plate (7) left and right; the third positioning portion (13) is slidably connected to the fixing plate (7) front and back; a fixing plate (8) is provided on the fixing plate (7); the fixing plate (8) is slidably connected to the fixing plate (7) up and down; and the first positioning portion (11) is slidably connected to the fixing plate (8) left and right.

3. The range hood impeller dynamic balance detection tooling according to claim 2, characterized in that: The second positioning portion (12) comprises two second adjustment arms (12-1), the two second adjustment arms (12-1) being respectively located at the left and right radial ends of the bottom surface of the volute (2), one end of each second adjustment arm (12-1) being slidably connected to a fixing plate (7) on the left and right sides, and the other end being supported as a support end at the radial ends of the bottom surface of the volute (2); The third positioning portion (13) comprises an adjusting rod (13-1) screwed to the fixing plate (7), the rear end of the adjusting rod (13-1) serving as a hand-screw end (13-2), and the top end serving as a contact end (13-3) abutting against the rear side wall of the volute (2); The first positioning portion (11) comprises two first adjustment arms (11-1), one end of each first adjustment arm (11-1) being slidably connected to the second fixing plate (8) in a left-right manner, and the other end serving as a downward pressing end corresponding to the supporting end of the second adjustment arm (12-1) and abutting against the top surface of the volute (2).

4. The range hood impeller dynamic balance detection tooling according to claim 3, characterized in that: A first support rod (11-2) is provided between the first adjustment arm (11-1) and the second fixing plate (8); one end of the first support rod (11-2) is fixedly connected to the first adjustment arm (11-1), and the other end is slidably connected to the second fixing plate (8) so that the first support rod (11-2) slides back and forth along the second fixing plate (8) along with the first adjustment arm (11-1); A second support rod (12-2) is provided between the second adjustment arm (12-1) and the fixed plate (7); one end of the second support rod (12-2) is fixedly connected to the second adjustment arm (12-1), and the other end is slidably connected to the fixed plate (7) so that the second support rod (12-2) slides back and forth along the fixed plate (7) along the second adjustment arm (12-1).

5. The range hood impeller dynamic balance detection tooling according to claim 4, characterized in that: The fixing plate 1 (7) and the fixing plate 2 (8) are both provided with a guide groove 1 (9) extending in the left-right direction. One end of the first support rod (11-2) and the second support rod (12-2) are connected to the corresponding guide groove 1 (9) through a locking bolt 1 (10). One end of the locking bolt 1 (10) is connected to the end of the first support rod (11-2) and the second support rod (12-2), and the other end passes through the guide groove 1 (9) and is screwed to the locking nut, so that the first support rod (11-2) and the second support rod (12-2) are slidably connected in the guide groove 1 (9) and can be locked and positioned by the locking nut.

6. The range hood impeller dynamic balance detection tooling according to claim 4, characterized in that: A movable mounting arm (11-3) is provided on the downward pressing end of the first adjusting arm (11-1); one end of the mounting arm (11-3) is connected to the first adjusting arm (11-1); a locking structure (11-4) capable of locking the mounting arm (11-3) is provided between the mounting arm (11-3) and the first adjusting arm (11-1); and the other end of the mounting arm (11-3) is provided with a downward pressing head (11-5) that is pressed downward to the top surface of the volute (2).

7. The range hood impeller dynamic balance detection tooling according to claim 6, characterized in that: The pressing head (11-5) comprises a connecting rod (11-5-1) and a rubber head (11-5-2) located at the bottom end of the connecting rod (11-5-1); the end of the mounting arm (11-3) is bent to form a second guide groove (11-5-3) extending in the left and right directions; the connecting rod (11-5-1) is vertically inserted into the second guide groove (11-5-3); two positioning pieces (11-5-4) are sleeved on the connecting rod (11-5-1); the two positioning pieces (11-5-4) respectively abut against the upper and lower end surfaces of the second guide groove (11-5-3); a nut is screwed on the connecting rod (11-5-1) to press the positioning piece (11-5-4); and the side edges of each positioning piece (11-5-4) are bent downward to form a limit with the edge of the mounting arm (11-3).

8. The range hood impeller dynamic balance detection tooling according to claim 7, characterized in that: The supporting end of the second adjusting arm (12-1) and the contact end (13-3) of the third adjusting arm, which are in contact with the volute (2), are both provided with rubber pads; the pressing head (11-5) of the first adjusting arm (11-1) is made of rubber material or a rubber pad is provided at the bottom of the pressing head (11-5).

9. A range hood impeller dynamic balance detection method, characterized in that: The steps include: S1, installing the volute (2) with the impeller (1) on any one of the range hood impeller (1) dynamic balancing detection tools as claimed in claims 1 to 8, and turning on the balancing machine to control the rotation of the impeller (1); S2, controlling the impeller (1) to rotate twice, the two rotations reaching relative positions, and the balancing machine measuring the position and size of the unbalanced portion according to unbalanced vibration signals generated by the two rotations; S3, calculating the unbalanced phase angle and unbalanced amount, i.e. the position and mass to be compensated, according to the phase difference and amplitude difference of the unbalanced vibration signal; S4, calculating the radius of the unbalanced position from the center of the impeller (1) according to the unbalanced phase angle, and calculating the mass of the counterweight according to the unbalanced amount and the radius value; S5, obtaining the position of the counterweight along the direction of the radius at the opposite position of the unbalanced phase angle, and performing a counterweight operation; S6: After the weight balancing is completed, repeat S2 and S3 to verify the weight balancing effect; S7, if the unbalance amount is less than or equal to the preset standard value, the process ends; if the unbalance amount is less than the preset standard value, S5 is repeated until the measured unbalance amount is less than or equal to the preset standard value.

10. The range hood impeller dynamic balance detection method according to claim 9, characterized in that: In S1, the volute (2) and the impeller (1) are first installed, and then an air inlet ring is installed at the air inlet of the volute (2), and finally the rotation of the impeller (1) is controlled by a balancing machine.

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