Range hood and impeller dynamic balance correction method thereof

Abstract

The present invention discloses a range hood and a method for correcting the dynamic balance of its impeller. The range hood includes a fan system, which includes a volute, an impeller, and a motor for driving the impeller to rotate. The impeller includes at least two blades. The range hood is characterized in that the fan system also includes an optical transceiver arranged on the inner side of the volute for detecting the dynamic balance state of the impeller. The optical transceiver includes a light emitting device. Each blade of the impeller is provided with a reflective mark capable of reflecting light emitted by the light emitting device. The light transceiver also includes a light receiving device capable of receiving light reflected by the reflective mark.

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a range hood and a method for correcting the dynamic balance of an impeller of the range hood. Background Art

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate based on the principles of fluid dynamics, using a centrifugal fan installed inside the hood to draw in and exhaust cooking fumes, while a filter removes some grease particles. A centrifugal fan consists of a volute, an impeller mounted within the volute, and a motor that drives the impeller. As the impeller rotates, negative pressure is generated at the fan's center, drawing cooking fumes from beneath the hood into the fan. After being accelerated by the fan, the volute collects them and guides them out of the room.

[0003] After long-term use of the range hood, a large amount of oil and dirt will stick to the fan, especially the impeller of the fan. Due to the influence of oil and dirt, the dynamic balance of the impeller is poor, which in turn causes the impeller to vibrate greatly during rotation, causing the fan frame to vibrate through the transmission path, resulting in problems such as vibration, which will lead to a poor user experience.

[0004] In order to solve the above-mentioned impeller jitter problem, the applicant's prior application (application number 202010123978.2) disclosed a method for correcting the dynamic balance of the impeller of the centrifugal fan of the range hood. The dynamic balance of the impeller is detected based on the deformation displacement generated by the strain gauge, and the correction method is performed by rotating the impeller 180° from its original position.

[0005] First, this method can only be used for vertical fans, because this form will cause more oil to accumulate in the lower part, and cannot be used for horizontal fans; secondly, the poor dynamic balance is not only affected by liquid oil, but also by solid particles attached to it, which cannot be obtained by the above-mentioned rotating impeller method, so the correction effect cannot achieve the expected effect. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a range hood that can expand the scope of application of dynamic balance correction in response to the deficiencies in the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a method for correcting the dynamic balance of the impeller of the above-mentioned range hood.

[0008] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a range hood, including a fan system, the fan system including a volute, an impeller and a motor for driving the impeller to rotate, the impeller including at least two blades, characterized in that: the fan system also includes an optical transceiver arranged on the inner side of the volute for detecting the dynamic balance state of the impeller, the optical transceiver includes a light emitting device, each blade of the impeller is provided with a reflective mark capable of reflecting the light emitted by the light emitting device, and the optical transceiver also includes a light receiving device capable of receiving the light reflected by the reflective mark.

[0009] The dynamic balance state of the impeller is detected by using an optical transceiver to transmit and receive reflected light. The method is applicable to vertical and horizontal fans and has a wide range of applications.

[0010] Furthermore, in order to facilitate the removal of solid particles on the impeller and obtain a better correction effect, the fan system also includes an auxiliary mechanism for removing solid particles on the impeller, and the auxiliary mechanism includes a brush and a driving mechanism for driving the brush to move relative to the impeller.

[0011] Preferably, in order to have a larger cleaning range, the driving mechanism includes a rotation driving module and a linear driving module to drive the brush to move along the axial direction of the impeller and rotate relative to the impeller.

[0012] In order to reduce the influence of the auxiliary mechanism on the performance of the fan, a groove for accommodating a brush is formed on the volute.

[0013] The technical solution adopted by the present invention to solve the second technical problem is: a method for correcting the dynamic balance of the impeller of the range hood as described above, characterized in that a reflective mark on one of the blades of the impeller is recorded as a marking point, and the correction method comprises the following steps:

[0014] 1) Turn on the range hood and start the fan system;

[0015] 2) The optical transceiver starts to emit detection light along the radial direction of the impeller, with the center point of the emitted light being O2;

[0016] 3) When the fan system reaches stable operation, within one revolution of the impeller, the position of the emitted light is recorded uniformly M times at intervals of time t starting from the marked point, thereby obtaining M L values, where L is the axial distance between the radial planes where the center points O1 and O2 of the light reflected by the reflection marker are located;

[0017] 4) Compare the current motor speed N with the preset speed threshold N1 and perform corresponding operations based on the comparison result:

[0018] 4.1) When N≤N1, if all L<L1 are satisfied, it indicates that the dynamic balance state is normal within this speed range, and the process ends; if not, proceed to step 5); L1 is the preset distance value;

[0019] 4.2) When N>N1, if there exists a portion of L satisfying L≤L0, and the number m of L satisfying the above relationship satisfies m>m0, where L0 is a preset distance value, and L0>L1, and m0 is a preset number that does not exceed the normal value, then if the above conditions are met, it indicates that the dynamic balance is normal within this speed range, and the process ends. If there exists a portion of L satisfying L>L0, and the number m′ of L satisfying the above relationship satisfies m′>m0′, then proceed to step 5), where m0′ is the preset number of abnormal values, and m0+m′0>m;

[0020] 5) The impeller dynamic balance exceeds the normal range and the oil pollution needs to be treated. Go to step 6);

[0021] 6) Remove oil from the impeller;

[0022] 7) Restart the fan system and record the position of the emitted light M times at intervals of time t starting from the marked point, thereby obtaining M Ls;

[0023] 8) Compare the current motor speed N with N1 and perform corresponding operations based on the comparison results:

[0024] 8.1) When N≤N1, if all L<L1 are satisfied, it indicates that the dynamic balance is normal within this speed range, and the process ends; if not, proceed to step 9);

[0025] 8.2) When N>N1, if there is a portion of L that satisfies L≤L0, and the number q of L that satisfies the above relationship satisfies q>m0, then it indicates that the dynamic balance is normal within this speed range, and the process ends. If there is a portion of L that satisfies L>L0, and the number q′ of L that satisfies the above relationship satisfies q′>m0′, then proceed to step 9);

[0026] 9) Record the time t corresponding to the L value that does not meet the requirement of not greater than L1 or L0 不满足 Calculate the leaf position corresponding to this time as Y 叶片 ;

[0027] 10) For the 叶片 Clean the blades again and return to step 7).

[0028] By comprehensively considering the different effects of dynamic balance at different speeds, impeller imbalance will not cause a major impact at low speeds, but will cause a great impact at high speeds. Different correction operations are performed to achieve good correction effects and high correction efficiency.

[0029] Furthermore, in order to facilitate the removal of solid particles on the impeller and obtain a better correction effect, the fan system also includes an auxiliary mechanism for removing solid particles on the impeller (2), and the auxiliary mechanism includes a brush and a driving mechanism for driving the brush to move.

[0030] Specifically, to achieve comprehensive cleaning, step 6) includes the following steps:

[0031] 6.1) Stop the fan system, start the drive mechanism, and control the brush to move along the blade axis; stop the movement when the movement distance reaches l1, and l1 does not exceed the distance between the brush's initial position on the volute and the end of the corresponding blade away from the brush;

[0032] 6.2) Then drive the brush to rotate a certain angle, and then drive the brush to move along the axial direction of the blade to clean the oil stains on the impeller;

[0033] 6.3) After cleaning one blade, start the fan system to rotate the impeller 360 / n, then stop, where n is the number of blades; drive the brush to move along the blade axis to clean the oil stains on the blade; until the impeller rotates 360° and all blades are cleaned, the auxiliary mechanism returns to its initial position.

[0034] Furthermore, in order to improve the correction effect, in step 10), the 叶片 The way to clean the blades again is to change the 叶片 The blade moves to the position corresponding to the brush and stops, and the brush is controlled to move axially to clean the blade again.

[0035] Compared with the prior art, the advantages of the present invention are: by utilizing an optical transceiver to transmit and receive reflected light, the dynamic balance state of the impeller is detected, and it can be applied to vertical and horizontal fans, with a wide range of applications; by comprehensively considering the different effects of dynamic balance at different speeds, impeller imbalance will not cause a major impact at low speeds, but will cause a great impact at high speeds, and different correction operations are performed, so that the correction effect is good and the correction efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a schematic diagram of a fan system of a range hood according to an embodiment of the present invention;

[0037] Figure 2 2 is a cross-sectional view (radial cross-section) of a fan system of a range hood according to an embodiment of the present invention;

[0038] Figure 3 A side view of an impeller and a portion of a volute of a fan system of a range hood according to an embodiment of the present invention;

[0039] Figure 4 2 is a cross-sectional view (axial cross-section) of a fan system of a range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0042] See also Figures 1 to 4 , shows a fan system for a range hood according to a preferred embodiment of the present invention. This system is a centrifugal fan comprising a volute 1, an impeller 2 disposed within the volute 1, and a motor 5 for driving the impeller 2. The range hood can be of any configuration, including top-draft, side-draft, and low-draft. The impeller 2 is a centrifugal fan having at least two blades 21. The impeller 2 can be conventionally manufactured.

[0043] The fan system also includes an auxiliary mechanism 3 for removing solid particles from the impeller 2. In this embodiment, preferably, the auxiliary mechanism 3 includes a brush 31 and a driving mechanism 32 for driving the brush 31 to move. The driving mechanism 32 includes a rotation driving module and a linear driving module, wherein the output end of one driving module is connected to the other driving module, and the output end of the other driving module is connected to the brush 31. The linear motion of the linear driving module is along the axial direction of the impeller 2, and the rotation axis of the brush 31 is perpendicular to the axis of the impeller 2, as shown in FIG. Figure 3 The brush 31 can contact the blades 21 of the impeller 2 to remove solid particles on the blades 21. When the fan system is operating normally, the brush 31 can be placed in the groove 11 formed on the volute 1 to avoid affecting the fan performance.

[0044] The fan system also includes an optical transceiver 4, which can be set on the inner side of the volute 1, including a light emitting device and a light receiving device (not shown in the drawings, an existing optical transceiver can be used), which can emit light for detection and receive light reflected by the blades 21. The light receiving device can receive the reflected light at the position of the light emitting device and at the two opposite sides of the light emitting device along the axial direction of the impeller 2. A reflective mark 211 is provided on each blade 21 of the impeller 2. The mark is made of a reflective material and has no shape limit. It is used to reflect the light emitted by the optical transceiver 4. The reflective mark 211 and the light emitting device of the optical transceiver 4 are located at the same position in the axial direction of the impeller 2. If the impeller 2 is in good dynamic balance, the angle α between the light reflected by the reflective mark 211 and the light emitted by the optical transceiver 4 is 0° or close to 0°; if the impeller 2 loses its dynamic balance, it means that the rotation center of the impeller 2 is offset, so the light reflected by the reflective mark 211 will form an angle with the light emitted by the optical transceiver 4. α The angle is greater than 0°. After the reflected light is received by the light receiving device, the axial distance L between the center O1 of the reflected light (on the blade 21) and the center O2 of the emitted light, respectively, on the radial plane of the impeller 2 can be calculated (for example, it can be half the axial distance between the receiving position and the emitting position, where the axial direction refers to the axial direction of the impeller 2). The reflective mark 211 on a particular blade 21 is used as the marking point P. For example, the reflective mark 211 can be made different from the reflective marks 211 on other blades 21.

[0045] The present invention provides a range hood having the above-mentioned fan system, and a method for correcting the dynamic balance of its impeller, comprising the following steps:

[0046] 1) Turn on the range hood and start the fan system;

[0047] 2) The optical transceiver 4 begins to emit detection light in the radial direction of the impeller 2. The detection light has a certain coverage range. The certain coverage range means that when it reaches the blade 21, it has a certain range in the axial direction of the impeller 2 and a certain range in the direction perpendicular to the axial direction, forming a rectangular light coverage range. The center point of the emitted light is O2;

[0048] 3) When the operating speed is stable, whether the fan system has reached a stable state can be determined by detecting the current of the motor 5. Within one rotation of the impeller 2, the position of the emitted light is evenly recorded M times at intervals of time t starting from the marked point P, thereby obtaining M L values (the M L values may be the same or different);

[0049] 4) Continuously detect the rotation speed of the motor 5, compare the current rotation speed N of the motor 5 with a preset rotation speed threshold N1, and perform corresponding operations based on the comparison result. N1 can be obtained through experiments or set based on empirical values. For example, if a range hood has two gears, a low gear and a high gear, the critical value between the two gears is set as N1:

[0050] 4.1) When N ≤ N1, if all L < L1 are satisfied, it indicates that the dynamic balance is normal within this speed range and the process ends; if not, proceed to step 5); where L1 is a preset distance value, which can be obtained through multiple experiments in advance and is the critical value at which the vibration of impeller 2 reaches an unacceptable level at low speeds;

[0051] 4.2) When N>N1, if there is a portion of L that satisfies L≤L0, and the number m of L that satisfies the above relationship satisfies m>m0, where L0 is also a preset distance value, which can be obtained in advance through multiple experiments, and is the critical value when the impeller 2 jitter reaches an unacceptable value when the speed is high, and satisfies L0>L1, m0 is the preset number that needs to reach no more than the normal value (satisfying L≤L0 is normal). When the above conditions are met, it indicates that the dynamic balance is still normal within this speed range at this time, and the process ends; if there is a portion of L that satisfies L>L0, and the number m′ of L that satisfies the above relationship satisfies m′>m0′, then proceed to step 5), where m0′ is the preset number of acceptable abnormal values (satisfying L>L0 is abnormal), and m0+m′0>m;

[0052] 5) The dynamic balance of impeller 2 exceeds the normal range and the oil pollution needs to be treated. Go to step 6);

[0053] 6) Remove oil from impeller 2:

[0054] 6.1) Stop the fan system, start the drive mechanism 32, and control the brush 31 to move along the axial direction of the blade 21; stop the movement when the movement distance reaches l1, where l1 does not exceed the distance between the brush 31's initial position on the volute 1 (in the groove 11) and the end of the corresponding blade 21 away from the brush 31;

[0055] 6.2) Then drive the brush 31 to rotate a certain angle, such as 90°, and then drive the brush 31 to move along the axial direction of the blade 21 to clean the oil stains on the impeller 2;

[0056] 6.3) After cleaning one blade 21, the fan system is started to rotate the impeller 2 360° / n, then stops, where n is the number of blades 21. The brush 31 is driven to move along the axial direction of the blade 21 to clean the oil stains on the blade 21. This continues until the impeller 2 rotates 360° and all blades 21 are cleaned. The auxiliary mechanism 3 returns to its initial position.

[0057] 7) Restart the fan system and record the position of the emitted light M times at intervals of time t starting from the marked point P, thereby obtaining M Ls;

[0058] 8) Continuously detect the speed of the motor 5, compare the current speed N of the motor 5 with N1, and perform corresponding operations based on the comparison result:

[0059] 8.1) When N≤N1, if all L<L1 are satisfied, it indicates that the dynamic balance is normal within this speed range, and the process ends; if not, proceed to step 9);

[0060] 8.2) When N>N1, if there is a portion of L that satisfies L≤L0, and the number q of L that satisfies the above relationship satisfies q>m0, then it indicates that the dynamic balance is normal within this speed range, and the process ends. If there is a portion of L that satisfies L>L0, and the number q′ of L that satisfies the above relationship satisfies q′>m0′, then proceed to step 9);

[0061] 9) Record the time t corresponding to the L value that does not meet the requirement of not greater than L1 or L0 不满足 Calculate the position of blade 21 corresponding to this time as Y 叶片 , proceed to step 10);

[0062] 10) Mark as Y 叶片 The blade 21 moves to the position corresponding to the brush 31 and stops, and the brush 31 is controlled to move axially to clean the blade 21 again; return to step 7).

[0063] The method of the present invention can be applied not only to vertical fans, but also to horizontal fans. In addition, the method takes into account the different effects of dynamic balance at different speeds. Impeller imbalance will not cause a significant impact at low speeds, but will cause a significant impact at high speeds. Therefore, it is necessary to consider the effects of dynamic imbalance at different speeds.

Claims

1. A method for correcting the dynamic balance of an impeller of a range hood, wherein the range hood comprises a fan system, the fan system comprising a volute (1), an impeller (2), and a motor (5) for driving the impeller (2) to rotate, the impeller (2) comprising at least two blades (21), and characterized in that: The fan system further comprises an optical transceiver (4) arranged inside the volute (1) for detecting the dynamic balance state of the impeller (2), the optical transceiver (4) comprising a light emitting device, each blade (21) of the impeller (2) being provided with a reflective mark (211) capable of reflecting light emitted by the light emitting device, and the optical transceiver (4) further comprising a light receiving device capable of receiving light reflected by the reflective mark (211); A reflective mark (211) on one of the blades (21) of the impeller (2) is recorded as a marking point (P), and the calibration method comprises the following steps: 1) Turn on the range hood and start the fan system; 2) The optical transceiver (4) starts to emit detection light along the radial direction of the impeller (2), with the center point of the emitted light being O2; 3) When the fan system reaches stable operation, within one rotation of the impeller (2), the position of the emitted light is recorded M times uniformly starting from the mark point (P) at intervals of time t, thereby obtaining M Ls, where L is the axial distance between the radial planes where the center points O1 and O2 of the light reflected by the reflective mark (211) are located; 4) Compare the current speed N of the motor (5) with the preset speed threshold N1, and perform corresponding operations according to the comparison result: 4.1) When N≤N1, if all L<L1 are satisfied, it indicates that the dynamic balance state is normal within this speed range, and the process ends; if not, proceed to step 5); L1 is the preset distance value; 4.2) When N>N1, if there is a part of L that satisfies L≤L0, and the number m of L that satisfies the above relationship satisfies m>m0, L0 is the preset distance value, and satisfies L0>L1, m0 is the preset number that does not exceed the normal value, when the above conditions are met, it indicates that the dynamic balance is still normal within this speed range, and the process ends; if there is a part of L that satisfies L>L0, and the number m′ of L that satisfies the above relationship satisfies m′>m0′, then go to step 5), where m0′ is the preset number of abnormal values, and m0+m ′ 0>m; 5) The dynamic balance of impeller (2) exceeds the normal range and needs to be treated for the oil contamination, and then proceed to step 6); 6) Degreasing the impeller (2); 7) Restart the fan system and record the position of the emitted light M times at intervals of time t starting from the marked point (P), thereby obtaining M Ls; 8) Compare the current speed N of the motor (5) with N1 and perform corresponding operations according to the comparison result: 8.1) When N≤N1, if all L<L1 are satisfied, it indicates that the dynamic balance is normal within this speed range, and the process ends; if not, proceed to step 9); 8.2) When N>N1, if there is a portion of L that satisfies L≤L0, and the number q of L that satisfies the above relationship satisfies q>m0, then it indicates that the dynamic balance is normal within this speed range, and the process ends; if there is a portion of L that satisfies L>L0, and the number q′ of L that satisfies the above relationship satisfies q′>m0′, then proceed to step 9); 9) Record the time t corresponding to the L value that does not meet the requirement of not greater than L1 or L0 不满足 Calculate the position of the blade (21) corresponding to the time as Y 叶片 ; 10) For the 叶片 The blade (21) is cleaned again and the process returns to step 7).

2. The range hood impeller dynamic balance correction method according to claim 1, characterized in that: The fan system further comprises an auxiliary mechanism (3) for removing solid particles on the impeller (2), wherein the auxiliary mechanism (3) comprises a brush (31) and a driving mechanism (32) for driving the brush (31) to move.

3. The range hood impeller dynamic balance correction method according to claim 2, characterized in that: In step 6), the following steps are included: 6.1) Stop the fan system, start the drive mechanism (32), and control the brush (31) to move along the axial direction of the blade (21); stop the movement when the movement distance reaches l1, and l1 does not exceed the distance between the brush (31) from the initial position on the volute (1) to the end of the corresponding blade (21) away from the brush (31); 6.2) Then drive the brush (31) to rotate a certain angle, and then drive the brush (31) to move along the axial direction of the blade (21) to clean the oil stains on the impeller (2); 6.3) After cleaning one blade (21), the fan system is started to rotate the impeller (2) 360 / b, and then stops, where b is the number of blades (21); the brush (31) is driven to move along the axial direction of the blade (21) to clean the oil stains on the blade (21); until the impeller (2) rotates 360 degrees and all blades (21) are cleaned; the auxiliary mechanism (3) returns to its initial position.

4. The range hood impeller dynamic balance correction method according to claim 2, characterized in that: In step 10), the 叶片 The blade (21) is cleaned again by removing the blade marked with Y 叶片 The blade (21) moves to a position corresponding to the brush (31) and then stops, and the brush (31) is controlled to move axially to clean the blade (21) again.

5. The range hood impeller dynamic balance correction method according to claim 1, characterized in that: The fan system further comprises an auxiliary mechanism (3) for removing solid particles on the impeller (2), wherein the auxiliary mechanism (3) comprises a brush (31) and a driving mechanism (32) for driving the brush (31) to move relative to the impeller (2).

6. The range hood impeller dynamic balance correction method according to claim 5, characterized in that: The driving mechanism (32) comprises a rotation driving module and a linear driving module, so as to drive the brush (31) to move along the axial direction of the impeller (2) and to rotate relative to the impeller (2).

7. The range hood impeller dynamic balance correction method according to claim 5, characterized in that: A groove (11) for accommodating a brush (31) is formed on the volute (1).

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