Ceiling type range hood and air inlet ring control method thereof

Abstract

The invention relates to a ceiling type range hood and its air inlet ring control method, wherein the ceiling type range hood comprises a fume collecting cover with an air inlet and an air outlet, a fume blocking plate assembly movably connected to the air inlet side of the fume collecting cover, and a fan system connected to the air outlet of the fume collecting cover, wherein the fan system is installed in a ceiling type in the kitchen, and the fan system comprises a horizontally installed air inlet ring, an impeller arranged at the rear side of the air inlet ring, and a fan for driving the impeller to rotate, wherein an oil leakage hole is arranged on the air inlet ring, and the fan system is further provided with a driving device for driving the air inlet ring to rotate so as to change the position of the oil leakage hole. Compared with the prior art, the driving device can adjust the position of the oil leakage hole in the air inlet ring.

Description

TECHNICAL FIELD

[0001] The present application relates to a ceiling type range hood and a method for controlling an air inlet ring thereof. BACKGROUND

[0002] Since the range hood entered China in the 1990s, it has become an essential kitchen appliance for the people. Its main function is to suck the oil fume generated by the user during cooking into the air inlet of the range hood through the impeller of the fan system, filter the oil fume by the air inlet filter screen and the impeller, and then discharge the filtered oil fume from the air outlet of the range hood, thereby completing the purification of the kitchen environment.

[0003] At present, the installation positions of the range hood on the market are ceiling type, cabinet type and integrated type. For the ceiling type range hood, due to the limitation of the ceiling space, the installation position is mostly in a downward installation mode of the air inlet of the fan system. This installation mode causes the curved part of the air inlet ring of the fan system to become the lowest point of the fan system in the same horizontal plane, so that the oil leakage hole needs to be arranged on the air inlet ring of the fan system. This will cause a problem that due to the installation, the air inlet ring cannot be completely horizontal, so there will always be some accumulated oil left in the air inlet ring. After a period of use, this part of the accumulated oil will solidify on the air inlet ring, not only affecting the subsequent outflow of the accumulated oil, but also causing the curved shape of the air inlet ring to deviate from the design, which will have a great impact on the performance of the fan system, and the longer the time, the greater the impact on the user's experience. At present, there is no good solution to the above problem on the market, and most manufacturers use fan system self-cleaning technology to improve it, but this method cannot completely solve the problem, and for specific installation conditions, the problem will still be very serious. The technical scheme provides a range hood and a method for controlling the air inlet ring. The pressure monitoring device arranged on the existing range hood can realize real-time monitoring of the accumulated oil in the air inlet ring, and adjust the air inlet ring according to different working conditions, so that the accumulated oil problem in the air inlet ring is completely solved, and different oil leakage hole positions can be matched with the fan, thereby improving the user's experience. SUMMARY

[0004] The first technical problem to be solved by the present application is to provide a ceiling type range hood with an adjustable and changeable oil leakage hole position in the air inlet ring.

[0005] The second technical problem to be solved by the present application is to provide a ceiling type range hood which can realize real-time monitoring of the accumulated oil in the air inlet ring of the fan system, and can adjust and change the position of the oil leakage hole in the air inlet ring according to different accumulated oil states in the air inlet ring.

[0006] The third technical problem solved by the present application is to provide an air inlet ring control method for the ceiling type range hood, which can monitor the oil accumulation in the air inlet ring in real time and adjust the position of the air inlet ring according to different oil accumulation states.

[0007] The technical solution adopted by the present application to solve the first technical problem is a ceiling type range hood, which comprises a fume collecting hood having an air inlet and an air outlet, a fume blocking plate assembly movably connected to the air inlet side of the fume collecting hood, and a fan system connected to the air outlet of the fume collecting hood, wherein the fan system is installed in a ceiling type in the kitchen, the fan system comprises a horizontal air inlet ring, an impeller arranged at the rear side of the air inlet ring, and a fan for driving the impeller to rotate, and the air inlet ring is provided with an oil leakage hole, and characterized in that the fan system is further provided with a driving device for driving the air inlet ring to rotate so as to change the position of the oil leakage hole.

[0008] As an improvement, the driving device comprises a driving motor, a gear connected to the output shaft of the driving motor, and a gear rack arranged on the wall of the air inlet ring and engaged with the gear, wherein when the driving motor drives the gear to rotate, the gear is engaged with the gear rack on the air inlet ring, thereby driving the air inlet ring to rotate and changing the position of the oil leakage hole on the air inlet ring.

[0009] The technical solution adopted by the present application to solve the second technical problem is that, based on the above structure, the fan system is further provided with a pressure monitoring device for monitoring the oil accumulation in the air inlet ring in real time, and the driving device is arranged to adjust and change the position of the oil leakage hole in the air inlet ring according to the oil accumulation in the air inlet ring detected by the pressure monitoring device.

[0010] As an improvement, the pressure monitoring device comprises a plurality of pressure sensors for monitoring the oil accumulation at different positions in the air inlet ring in real time, and the driving device is arranged to adjust the position of the oil leakage hole in the air inlet ring to the position where the oil accumulation is the most serious according to the oil accumulation in the air inlet ring detected by the pressure monitoring device.

[0011] Further improvement, the air inlet ring is connected and fixed with a volute base, and the peripheral wall of the air inlet ring is connected with the volute base through a bearing and a pressure sensor at different positions.

[0012] Further improvement, the driving device is installed on the volute base.

[0013] As a preferred, the pressure sensor is provided with four, and the four pressure sensors are connected to each other to form a square and are uniformly distributed at four different directions of the air inlet ring.

[0014] The first technical solution for solving the third technical problem is: based on the above structure, the air inlet ring control method of the ceiling type range hood, characterized by: establishing a coordinate system with the plane where the air inlet ring is located, taking the center of the air inlet ring as the origin, setting the four pressure sensors as the first pressure sensor, the second pressure sensor, the third pressure sensor, and the fourth pressure sensor, respectively, taking the position of the first pressure sensor as the positive direction of the Y coordinate, taking the position of the second pressure sensor as the positive direction of the X coordinate, taking the position of the third pressure sensor as the negative direction of the X coordinate, and taking the position of the fourth pressure sensor as the negative direction of the Y coordinate;

[0015] The air inlet ring control method includes the following steps:

[0016] S1, the user starts the range hood, and the driving device drives the air inlet ring to be located at the initial position, at which time the oil leakage hole on the air inlet ring is located at the initial position;

[0017] S2, four pressure sensor data p11, p12, p13, and p14 are obtained, respectively, and the pressure differences dep1, dep2, dep3, and dep4 with the last recorded four pressure values p01, p02, p03, and p04 are calculated, wherein dep1=p11-p01, dep2=p12-p02, dep3=p13-p03, and dep4=p14-p04, the angle value k1 at which the most oil accumulation in the air inlet ring is located is determined according to the pressure differences dep1, dep2, dep3, and dep4, k1 is the included angle between the line connecting the position where the most oil accumulation in the air inlet ring is located and the center of the air inlet ring and the positive and negative directions of the X axis, The oil accumulation amount m1 in the air inlet ring is calculated, m1=(dep1+dep2+dep3+dep4)*s, wherein s is the area of the contact part of the pressure sensor and the volute base, and the current time t1 is recorded;

[0018] S3, the driving device is started to work, and according to the calculated k1 value, the driving device drives the oil leakage hole in the air inlet ring to adjust to the position of the most oil accumulation in the air inlet ring;

[0019] S4, it is judged whether the user turns off the range hood, if yes, S5 is entered, and if not, S2 is entered after a preset time t2;

[0020] S5, the fan stops rotating, and after the time length from the fan stopping rotating reaches t3, the data of each pressure sensor is recorded and p0 is updated, t3 is a preset stop working time threshold.

[0021] The second technical solution for solving the third technical problem is: on the basis of the above structure, a coordinate system is established with the plane of the air inlet ring as the coordinate system, the center of the air inlet ring as the origin, the four pressure sensors are respectively set as a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor, the position of the first pressure sensor is set as the positive direction of the Y coordinate, the position of the second pressure sensor is set as the positive direction of the X coordinate, the position of the third pressure sensor is set as the negative direction of the X coordinate, and the position of the fourth pressure sensor is set as the negative direction of the Y coordinate;

[0022] The air inlet ring control method comprises the following steps:

[0023] S1, the user starts the range hood, and the driving device drives the air inlet ring to be located at an initial position, at this time, the oil leakage hole on the air inlet ring is located at the initial position, the initial position is located at the negative direction of the Y coordinate, parameters m and n are set, and m=0 and n=360;

[0024] S2, the fan speed r1 is obtained;

[0025] S3, the data p11, p12, p13 and p14 of the four pressure sensors are respectively obtained, and the pressure differences dep1, dep2, dep3 and dep4 between the four pressure values p01, p02, p03 and p04 recorded last time are calculated, wherein dep1=p11-p01, dep2=p12-p02, dep3=p13-p03 and dep4=p14-p04, the angle value k1 of the position where the most oil is accumulated in the air inlet ring is determined according to the pressure differences dep1, dep2, dep3 and dep4, k1 is the included angle between the line connecting the position where the most oil is accumulated in the air inlet ring and the center of the air inlet ring and the positive and negative directions of the X axis, The oil accumulation amount m1 in the air inlet ring is calculated, m1=(dep1+dep2+dep3+dep4)*s, wherein s is the area of the contact part of the pressure sensor and the volute base, and the current time t1 is recorded;

[0026] S4, whether r1 is greater than r0 is judged, wherein r0 is a preset working frequency threshold, if yes, S5 is entered, and if no, S6 is entered;

[0027] S5, m=180° and n=360° are set, and S6 is entered;

[0028] S6, whether k1 belongs to [m, n] is judged, if yes, S7 is entered, and if no, S14 is entered;

[0029] S7, the driving device is started to work, the position of the oil leakage hole in the air inlet ring is adjusted to the position where the most oil is accumulated in the air inlet ring according to the calculated k1 value, and S8 is entered;

[0030] S8, reacquire the latest m1, t1 by the method of step S3, acquire the change value dem1 of the re-calculated m1 from the last m1, acquire the change value det1 of the re-calculated t1 from the last t1, calculate the oil production rate v1 according to dem1, det1, enter S9;

[0031] S9, judge whether v1 is greater than v0, if yes, enter S10, if not, enter S11, wherein v0 is a preset oil production rate threshold value;

[0032] S10, drive the oil leakage hole position in the air inlet ring to remain unchanged, and enter S12;

[0033] S11, drive the air inlet ring to rotate, and change the angle between the oil leakage hole and the X-axis positive direction connected with the center to a function k(t)=sin(w1*t), enter S12, wherein w1 is a preset swing angular velocity value;

[0034] S12, acquire the time length t2 that the angle between the oil leakage hole and the X-axis positive direction connected with the center remains from k1 to the current time, and enter S13;

[0035] S13, judge whether t2 is greater than t3, if yes, enter S19, if not, enter S8; t3 is a preset unit working time threshold value;

[0036] S14, calculate the oil production m2 in the angle [m, n] in the air inlet ring according to dep1, dep2, dep3, dep4, and then enter S15; wherein

[0037] m2=a1*k1*dep1 c1 *dep2 c2 *dep3 c3 *dep4 c4 +a2*k1*dep1 c5 *dep2 c6 , wherein

[0038] a1, a2, c1, c2, c3, c4, c5, c6 are constants;

[0039] S15, drive the air inlet ring to rotate, and make the angle between the oil leakage hole and the X-axis positive direction connected with the center rotate at an angular velocity w2 within the angle [m, n], and rotate at w3 within the remaining angle range, wherein w2 / w3=m2 / (m1-m2); enter S16;

[0040] S16, acquire the time length t4 that the air inlet ring is used from the start of rotation to the current time;

[0041] S17, judge whether t4 is greater than t3, if yes, enter S18, if not, enter S15;

[0042] S18, the driving device drives the rotation of the air inlet ring, so that the oil leakage hole on the air inlet ring is located at the initial position, and S19 is entered;

[0043] S19, the driving device drives the oil leakage hole in the air inlet ring to remain unchanged, and S20 is entered;

[0044] S20, judge whether the user closes the range hood, if yes, enter S21, if not, enter S2;

[0045] S21, the fan stops rotating, and records the data of each pressure sensor and updates p0 after the time length used since the fan stops rotating reaches t5, t5 is a preset stop working time threshold.

[0046] Compared with the prior art, the advantages of the present application are that: by setting the driving device capable of driving the rotation of the air inlet ring in the fan system, the driving device can be manually started or automatically started, so that the position of the oil leakage hole in the air inlet ring can be manually adjusted or automatically adjusted; in the improved scheme, by setting the pressure monitoring device, the accumulated oil in the air inlet ring of the fan system can be monitored in real time, and the driving device can adjust the position of the oil leakage hole in the air inlet ring according to different accumulated oil states in the air inlet ring, so that the outflow of the accumulated oil is more smooth, the solidified accumulated oil is greatly reduced, and the performance loss during the operation of the fan system is reduced; in the further improved scheme, the oil leakage hole is located at the position where the most accumulated oil is generated, the flow distance of the accumulated oil is reduced, and more accumulated oil is easily discharged; the adaptability of the fan system to operating conditions is improved. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 It is a structure schematic diagram of the ceiling type range hood in the embodiment of the present application.

[0048] Figure 2 It is a structure schematic diagram of the ceiling type range hood in the embodiment of the present application.

[0049] Figure 3 It is a structure schematic diagram of the ceiling type range hood in the embodiment of the present application.

[0050] Figure 4 It is a structure schematic diagram of the ceiling type range hood in the embodiment of the present application.

[0051] Figure 5 It is a structure schematic diagram of the ceiling type range hood in the embodiment of the present application.

[0052] Figure 6 It is a structure schematic diagram of the ceiling type range hood in the embodiment of the present application.

[0053] Figure 7 This is a schematic diagram showing the distribution of the four pressure sensors in an embodiment of the present invention.

[0054] Figure 8 This is a first flowchart of the air inlet ring control method for a ceiling-mounted range hood in an embodiment of the present invention;

[0055] Figure 9 This is a second flowchart of the air inlet ring control method for a ceiling-mounted range hood in an embodiment of the present invention; Detailed Implementation

[0056] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0057] like Figure 1 The ceiling-mounted range hood shown includes a smoke hood 1 with an air inlet and an air outlet, a smoke baffle assembly 2 movably connected to the air inlet side of the smoke hood, and a fan system 3 connected to the air outlet of the smoke hood 1 via a smoke pipe. The fan system 3 is ceiling-mounted in the kitchen and includes a horizontally mounted air inlet ring 31, an impeller 32 located behind the air inlet ring, a fan 33 driving the impeller, and a volute 34 located outside the impeller. (See attached image.) Figure 2 As shown.

[0058] The air inlet ring 31 is annular, with a downward-facing oil accumulation groove formed in the center. An oil drain hole 311 is located at the bottom of the oil accumulation groove. The fan system also includes a drive device 4 for rotating the air inlet ring 31 to change the position of the oil drain hole. In this embodiment, the drive device 4 includes a drive motor 41 and a gear 42 connected to the output shaft of the drive motor 41. A rack 312 meshes with the gear on the ring wall of the air inlet ring 31. When the drive motor 41 drives the gear 42 to rotate, the gear 42 meshes with the rack on the air inlet ring, thereby rotating the air inlet ring 31 and changing the position of the oil drain hole 311 on the air inlet ring. (See also...) Figure 4 , 5 As shown in Figure 6.

[0059] The fan system also includes a pressure monitoring device for real-time monitoring of oil accumulation in the air inlet ring. The drive device is configured to adjust the position of the oil leakage hole in the air inlet ring based on the oil accumulation detected by the pressure monitoring device. The pressure monitoring device includes multiple pressure sensors that monitor the oil accumulation at different locations within the air inlet ring in real time. The drive device is configured to adjust the position of the oil leakage hole in the air inlet ring to the location of the most severe oil accumulation based on the oil accumulation detected by the pressure monitoring device.

[0060] In this embodiment, four pressure sensors are provided, which are respectively denoted as 61, 62, 63 and 64. The four pressure sensors are connected to each other to form a square shape and are uniformly distributed at four different positions of the air inlet ring. The air inlet ring 31 is connected and fixed to the volute base 341, and the peripheral wall of the air inlet ring 31 is connected to the volute base 341 at four different positions through a bearing 5 and a pressure sensor. The driving device 4 is installed on the volute base 341, as shown in Figure 4 .

[0061] There are two kinds of air inlet ring control methods for the ceiling type range hood described above. One of them is shown in Figure 6 , which includes the following steps:

[0062] A coordinate system is established on the plane where the air inlet ring is located, and the center of the air inlet ring is taken as the origin. The four pressure sensors are respectively set as the first pressure sensor 61, the second pressure sensor 62, the third pressure sensor 63 and the fourth pressure sensor 64. The position of the first pressure sensor 61 is taken as the positive direction of the Y coordinate, the position of the second pressure sensor 62 is taken as the positive direction of the X coordinate, the position of the third pressure sensor 63 is taken as the negative direction of the X coordinate, and the position of the fourth pressure sensor 64 is taken as the negative direction of the Y coordinate, as shown in Figure 7 .

[0063] The air inlet ring control method includes the following steps:

[0064] S1, the user starts the range hood, and the driving device drives the air inlet ring to be located at the initial position. At this time, the oil leakage hole on the air inlet ring is located at the initial position. The initial position can be any position. In this embodiment, the initial position is located at the negative direction of the Y coordinate.

[0065] S2, the data p11, p12, p13 and p14 of the four pressure sensors are respectively acquired, and the pressure differences dep1, dep2, dep3 and dep4 between the four pressure values p01, p02, p03 and p04 recorded last time are calculated, wherein dep1=p11-p01, dep2=p12-p02, dep3=p13-p03 and dep4=p14-p04. According to the pressure differences dep1, dep2, dep3 and dep4, the angle value k1 of the position where the most oil is accumulated in the air inlet ring is determined, k1 is the included angle between the line connecting the position where the most oil is accumulated in the air inlet ring and the X axis positive and negative directions, The oil accumulation amount m1 in the air inlet ring is calculated, m1=(dep1+dep2+dep3+dep4)*s, wherein s is the area of the contact part of the pressure sensor and the volute base, and the current time t1 is recorded.

[0066] S3, the driving device is started to work, according to the k1 value obtained by calculation, the driving device drives the oil leakage hole position in the air inlet ring to adjust to the most oil accumulation position in the air inlet ring;

[0067] S4, whether the user closes the range hood is judged, if yes, S5 is entered, if not, after interval preset time t2, S2 is entered;

[0068] S5, the fan stops rotating, the data of each pressure sensor is recorded and p0 is updated after the time length used since the fan stops rotating reaches t3, and t3 is a preset stop working time threshold.

[0069] The air inlet ring control method three of the ceiling type range hood is another kind of Figure 7 As shown in the figure, it includes the following steps:

[0070] A coordinate system is established in the plane where the air inlet ring is located, the center of the air inlet ring is taken as the origin, four pressure sensors are respectively set as the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor, the position of the first pressure sensor is taken as the positive direction of Y coordinate, the position of the second pressure sensor is taken as the positive direction of X coordinate, the position of the third pressure sensor is taken as the negative direction of X coordinate, and the position of the fourth pressure sensor is taken as the negative direction of Y coordinate;

[0071] The air inlet ring control method includes the following steps:

[0072] S1, the user starts the range hood, the driving device drives the air inlet ring to be located at the initial position, at this time, the oil leakage hole on the air inlet ring is located at the initial position, the initial position is located at the negative direction of Y coordinate, parameters m and n are set, and m=0 and n=360 are set;

[0073] S2, the fan speed r1 is obtained;

[0074] S3, four pressure sensor data p11, p12, p13 and p14 are obtained respectively, and the pressure differences dep1, dep2, dep3 and dep4 of the four pressure values p01, p02, p03 and p04 recorded last time are calculated, wherein dep1=p11-p01, dep2=p12-p02, dep3=p13-p03 and dep4=p14-p04, the angle value k1 where the most oil accumulation position in the air inlet ring is located is determined according to the pressure differences dep1, dep2, dep3 and dep4, k1 is the included angle between the line connecting the most oil accumulation position in the air inlet ring and the center of the air inlet ring and the positive and negative directions of X axis, The oil accumulation amount m1 in the air inlet ring is calculated, m1=(dep1+dep2+dep3+dep4)*s, wherein s is the area of the contact part of the pressure sensor and the volute base, and the current time t1 is recorded;

[0075] S4, judge whether r1 is greater than r0, wherein r0 is a preset working frequency threshold, if yes, go to S5, if no, go to S6;

[0076] S5, let m=180°, n=360°, go to S6;

[0077] S6, judge whether k1 belongs to [m, n], if yes, go to S7, if no, go to S14;

[0078] S7, drive the device to work, according to the calculated k1 value, the drive device drives the oil leakage hole position in the air inlet ring to adjust to the place where the oil accumulation in the air inlet ring is the most, and goes to S8;

[0079] S8, reacquire the latest m1, t1 by using the method of step S3, acquire the change value dem1 of the re-calculated m1 and the last m1, acquire the change value det1 of the re-calculated t1 value and the last t1 value, calculate the oil accumulation rate v1 according to dem1 and det1, go to S9;

[0080] S9, judge whether v1 is greater than v0, if yes, go to S10, if no, go to S11, wherein v0 is a preset oil accumulation rate threshold;

[0081] S10, the drive device keeps the oil leakage hole position in the air inlet ring unchanged, and goes to S12;

[0082] S11, the drive device drives the air inlet ring to rotate, and changes the angle between the oil leakage hole and the X-axis positive direction connected with the center to a function k(t)=sin(w1*t), goes to S12, wherein w1 is a preset swing angular velocity value;

[0083] S12, acquire the time length t2 that the angle between the oil leakage hole and the X-axis positive direction connected with the center reaches k1 to the current time, and goes to S13;

[0084] S13, judge whether t2 is greater than t3, if yes, go to S19, if no, go to S8; t3 is a preset unit working time threshold;

[0085] S14, calculate the oil accumulation amount m2 in the angle [m, n] in the air inlet ring according to dep1, dep2, dep3 and dep4, and then go to S15; wherein

[0086] m2=a1*k1*dep1 c1 *dep2 c2 *dep3 c3 *dep4 c4 +a2*k1*dep1 c5 *dep2 c6wherein a1, a2, c1, c2, c3, c4, c5, c6 are constants;

[0087] S15, the driving device drives the air inlet ring to rotate, and the angle between the oil leakage hole and the center connection and the positive direction of the X axis is within [m, n] to rotate at an angular velocity w2, and the remaining angle range rotates at w3, wherein w2 / w3=m2 / (m1-m2); enter S16;

[0088] S16, obtain the time length t4 used by the air inlet ring from the start of rotation to the current time;

[0089] S17, judge whether t4 is greater than t3, if yes, enter S18, if not, enter S15;

[0090] S18, the driving device drives the air inlet ring to rotate, so that the oil leakage hole on the air inlet ring is located at the initial position, and enters S19;

[0091] S19, the driving device drives the air inlet ring to rotate, so that the oil leakage hole on the air inlet ring is located at the initial position, and enters S19;

[0092] S20, judge whether the user closes the range hood, if yes, enter S21, if not, enter S2;

[0093] S21, the fan stops rotating, and records the data of each pressure sensor and updates p0 after the time length t5 used since the fan stops rotating reaches t5, t5 is a preset stop working time threshold.

Claims

1. A ceiling-mounted range hood, comprising a fume collecting cover with an air inlet and an air outlet, a fume baffle assembly movably connected to the air inlet side of the fume collecting cover, and a fan system connected to the air outlet of the fume collecting cover, wherein the fan system is mounted in a ceiling of a kitchen, and comprises a horizontally mounted air inlet ring, an impeller arranged at the rear side of the air inlet ring, and a fan for driving the impeller to rotate, and wherein an oil leakage hole is arranged on the air inlet ring, characterized in that: The fan system is further provided with a driving device for driving the rotation of the air inlet ring to change the position of the oil leakage hole.

2. The ceiling-mounted range hood according to claim 1, characterized in that: The driving device comprises a driving motor, a gear connected with the output shaft of the driving motor, and a rack on the wall of the air inlet ring engaged with the gear. When the driving motor drives the gear to rotate, the gear is engaged with the rack on the air inlet ring, thereby driving the rotation of the air inlet ring and changing the position of the oil leakage hole on the air inlet ring.

3. The ceiling-mounted range hood according to claim 1, characterized in that: The fan system is further provided with a pressure monitoring device for monitoring the oil accumulation in the air inlet ring in real time. The driving device is arranged to adjust the position of the oil leakage hole in the air inlet ring according to the oil accumulation in the air inlet ring detected by the pressure monitoring device.

4. The ceiling-mounted range hood according to claim 3, characterized in that: The pressure monitoring device comprises a plurality of pressure sensors for monitoring the oil accumulation at different positions in the air inlet ring in real time. The driving device is arranged to adjust the position of the oil leakage hole in the air inlet ring to the position with the most serious oil accumulation according to the oil accumulation in the air inlet ring detected by the pressure monitoring device.

5. The ceiling-mounted range hood according to claim 4, characterized in that: The air inlet ring is connected and fixed with the volute base, and the peripheral wall of the air inlet ring is connected with the volute base at different positions through a bearing and a pressure sensor.

6. The ceiling-mounted range hood according to claim 5, characterized in that: The driving device is installed on the volute base.

7. The ceiling-mounted range hood according to claim 4, characterized in that: The pressure sensor is provided with four pressure sensors connected in a square shape and uniformly distributed at four different positions of the air inlet ring.

8. A method of controlling the air inlet bezel of a ceiling mounted range hood as defined in claim 7, characterized in that: A coordinate system is established on the plane of the air inlet ring, the center of the air inlet ring is taken as the origin, the four pressure sensors are respectively taken as the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor, the position of the first pressure sensor is taken as the positive direction of the Y coordinate, the position of the second pressure sensor is taken as the positive direction of the X coordinate, the position of the third pressure sensor is taken as the negative direction of the X coordinate, and the position of the fourth pressure sensor is taken as the negative direction of the Y coordinate. The air inlet ring control method comprises the following steps: S1, the user starts the range hood, the driving device drives the air inlet ring to be located at the initial position, at this time the oil leakage hole on the air inlet ring is located at the initial position; S2, respectively acquire four pressure sensor data p11, p12, p13, p14, and calculate the pressure difference dep1, dep2, dep3, dep4 with the last recorded four pressure values p01, p02, p03, p04, wherein dep1=p11-p01, dep2=p12-p02, dep3=p13-p03, dep4=p14-p04, determine the angle value k1 where the most accumulated oil in the inlet ring is located according to the pressure difference dep1, dep2, dep3, dep4, k1 is the included angle between the line connecting the position where the most accumulated oil in the inlet ring is located and the center of the inlet ring and the positive and negative directions of the X axis, Calculate the accumulated oil production m1 in the inlet ring, m1=(dep1+dep2+dep3+dep4)*s, wherein s is the area of the contact part of the pressure sensor and the volute base, record the current time t1; S3, the driving device is started, according to the k1 value obtained by calculation, the driving device drives the position of the oil leakage hole in the air inlet ring to the position with the most oil accumulation in the air inlet ring; S4, it is judged whether the user turns off the range hood, if yes, it enters S5, if not, it enters S2 after a preset time t2; S5, the fan stops rotating, the data of each pressure sensor is recorded and p0 is updated after the time length reaches t3 since the fan stops rotating, t3 is a preset stop working time threshold.

9. A method of controlling the air inlet bezel of a ceiling mounted range hood as defined in claim 7, characterized in that: A coordinate system is established on the plane of the air inlet ring, the center of the air inlet ring is taken as the origin, the four pressure sensors are respectively taken as the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor, the position of the first pressure sensor is taken as the positive direction of the Y coordinate, the position of the second pressure sensor is taken as the positive direction of the X coordinate, the position of the third pressure sensor is taken as the negative direction of the X coordinate, and the position of the fourth pressure sensor is taken as the negative direction of the Y coordinate. The air inlet ring control method comprises the following steps: S1, the user starts the range hood, the driving device drives the air inlet ring to be located at the initial position, at this time the oil leakage hole on the air inlet ring is located at the initial position, the initial position is located at the Y coordinate reverse direction, parameters m and n are set, and m=0 and n=360; S2, the fan speed r1 is obtained; S3, respectively acquire four pressure sensor data p11, p12, p13, p14, and calculate the pressure difference dep1, dep2, dep3, dep4 with the last recorded four pressure values p01, p02, p03, p04, wherein dep1=p11-p01, dep2=p12-p02, dep3=p13-p03, dep4=p14-p04, determine the angle value k1 where the most accumulated oil in the inlet ring is located according to the pressure difference dep1, dep2, dep3, dep4, k1 is the included angle between the line connecting the position where the most accumulated oil in the inlet ring is located and the center of the inlet ring and the positive and negative directions of the X axis, Calculate the amount of accumulated oil generated in the inlet ring m1, m1=(dep1+dep2+dep3+dep4)*s, wherein s is the area of the contact part of the pressure sensor and the volute base, record the current time t1; S4, it is judged whether r1 is greater than r0, wherein r0 is a preset working frequency threshold, if yes, S5 is entered, if not, S6 is entered; S5, m=180° and n=360° are set, and S6 is entered; S6, it is judged whether k1 belongs to [m, n], if yes, S7 is entered, if not, S14 is entered; S7, the driving device is started to work, according to the calculated k1 value, the driving device drives the oil leakage hole position in the air inlet ring to adjust to the position where the most oil accumulates in the air inlet ring, and S8 is entered; S8, using the method of step S3, reacquire the latest m1, t1, acquire the change value dem1 of the newly calculated m1 from the last m1, acquire the change value det1 of the newly calculated t1 value from the last t1 value, calculate the oil production rate v1 according to dem1, det1, Enter S9; S9, it is judged whether v1 is greater than v0, if yes, S10 is entered, if not, S11 is entered, wherein v0 is a preset oil accumulation rate threshold; S10, the driving device drives the oil leakage hole position in the air inlet ring to remain unchanged, and S12 is entered; S11, the driving device drives the air inlet ring to rotate, and the angle between the oil leakage hole and the X axis positive direction is changed according to the function k(t)=sin(w1*t), and S12 is entered, wherein w1 is a preset swing angular velocity value; S12, the time t2 that the angle between the oil leakage hole and the X axis positive direction reaches k1 to the current time is obtained, and S13 is entered; S13, it is judged whether t2 is greater than t3, if yes, S19 is entered, if not, S8 is entered; t3 is a preset unit working time threshold; S14, the oil accumulation amount m2 in the angle [m, n] in the air inlet ring is calculated according to dep1, dep2, dep3 and dep4, and then S15 is entered; Wherein m2 = a1 * k1 * dep1 c1 *dep2 c2 *dep3 c3 *dep4 c4 +a2 * k1 * dep1 c5 *dep2 c6 wherein a1, a2, c1, c2, c3, c4, c5 and c6 are constants; S15, the driving device drives the air inlet ring to rotate, and the angle between the oil leakage hole and the X axis positive direction is rotated at an angular velocity w2 in the angle [m, n], and is rotated at w3 in the remaining angle range, wherein w2 / w3=m2 / (m1-m2); S16 is entered; S16, the time t4 that the air inlet ring is used from starting to rotate to the current time is obtained; S17, it is judged whether t4 is greater than t3, if yes, S18 is entered, if not, S15 is entered; S18, the driving device drives the air inlet ring to rotate, so that the oil leakage hole on the air inlet ring is located at the initial position, and S19 is entered; S19, the driving device drives the oil leakage hole position in the air inlet ring to remain unchanged, and S20 is entered; S20, it is judged whether the user turns off the range hood, if yes, S21 is entered, if not, S2 is entered; S21, the fan stops rotating, and the pressure sensor data is recorded and p0 is updated after the time t5 that the fan stops rotating is reached, t5 is a preset stop working time threshold.

Images