Range hood

Abstract

The application discloses a range hood, comprising a fan assembly and a fan frame, the fan assembly comprising an impeller body, a motor and a volute, the volute being provided with an opening for the impeller body to enter and exit, the axial projection of the impeller body along the axial projection of the fan frame having an overlap, the side plate of the fan frame close to the opening being provided with a recess, the recess extending upward from the bottom of the fan frame; along the direction of the opening inside the volute, the motor comprising a first shaft section and a second shaft section, the diameter of the first shaft section being greater than that of the second shaft section, the length of the first shaft section being A, the length of the second shaft section being B, the distance between the side of the volute provided with the opening and the side of the fan frame provided with the recess being E, wherein A < E < A + B. When the impeller body needs to be removed, the impeller body is first moved horizontally outward to the second shaft section, then moved downward by a distance, and the impeller body is turned in the direction of the recess, so that the impeller body can be removed.

Description

Technical Field

[0001] This invention relates to a range hood. Background Technology

[0002] Currently, people have increasingly higher demands for range hoods, such as good oil fume extraction, low noise, small footprint, and easy disassembly and cleaning. To achieve better oil fume extraction, the fan system can be placed inside the range hood housing, bringing the air inlet closer to the oil fumes. However, due to size limitations, the fan size is restricted, and the closer proximity of the noise source to the user also leads to higher noise levels. To achieve lower noise levels, the fan can be placed on top within a fan bracket, but this usually requires a larger smoke collection area to prevent oil fumes from spreading (i.e., the oil fume extraction effect is generally lower). Balancing oil fume extraction performance with noise levels remains a challenge in current technology. Furthermore, existing range hood technology cannot simultaneously satisfy the requirements of ensuring sufficient fan size, reducing the overall footprint of the range hood, and enabling the fan to be disassembled and cleaned. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a range hood.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A range hood includes a fan assembly and a fan frame, the fan frame being disposed above the fan assembly;

[0006] The fan assembly includes an impeller body, a motor, and a volute. The volute has an opening for the impeller body to enter and exit. The motor drives the impeller body. The orthographic projection of the impeller body along its axial direction overlaps with the orthographic projection of the fan frame along its axial direction. A clearance groove is provided on one side plate of the fan frame near the opening. The clearance groove extends upward from the bottom of the fan frame.

[0007] Along the direction from the inside of the volute toward the opening, the motor includes a first shaft segment and a second shaft segment. The diameter of the first shaft segment is greater than the diameter of the second shaft segment. The length of the first shaft segment is A, and the length of the second shaft segment is B. The distance between the side of the volute with the opening and the side of the fan frame with the clearance groove is E, where A < E < A + B.

[0008] In this design, the orthographic projection of the impeller body along its axial direction overlaps with the orthographic projection of the fan frame along its axial direction. In other words, a portion of the impeller body is located within the fan frame. Compared to a design where the entire impeller body is located inside the volute, this design cleverly utilizes the space of the fan frame to house part of the impeller body, thereby reducing the overall dimensions in the height direction. This ensures the fan size while reducing the overall size of the range hood. An clearance groove is also provided on the side of the fan frame near the opening, and the motor is configured with a first shaft segment and a second shaft segment with different diameters. The distance E between the side of the volute with the opening and the side plate of the fan frame with the clearance groove is greater than the length A of the first shaft segment. Therefore, when it is necessary to remove the impeller body, the impeller body can be moved horizontally outward to the second shaft segment. Since the diameter of the second shaft segment is smaller than the diameter of the first shaft segment, the impeller body can be moved downward a small distance after being moved to the second shaft segment. Then, the impeller body can be flipped in the direction of the clearance groove, and the impeller body can be removed through the opening and the clearance groove, thus realizing the detachable cleaning of the impeller body.

[0009] Preferably, the side plate of the wind turbine frame has an inner side and an outer side, and the clearance groove extends gradually from the outer side to the inner side towards the top of the side plate.

[0010] In this solution, the above-mentioned structural form is adopted. When the impeller body is flipped in the direction of the clearance groove, the clearance groove is more in line with the flipping path of the impeller body, which helps to ensure the smooth flipping of the impeller body and thus ensures the smooth disassembly of the impeller body. On the other hand, it can also ensure the overall strength of the wind turbine frame. If the size of the clearance groove is large in order to facilitate the smooth disassembly of the impeller body, although the smooth flipping of the impeller body is ensured, it will affect the strength of the wind turbine frame.

[0011] Preferably, the angle between the clearance groove and the opening is α, the diameter of the first shaft segment is C, and the diameter of the second shaft segment is D, where π / 2-α≤arctan((CD) / (2*B)).

[0012] Preferably, the cross-section of the clearance groove is arc-shaped, and the orthographic projection of the center of the clearance groove along the axial direction of the impeller body coincides with the orthographic projection of the center of the impeller body along the axial direction of the impeller body. The radius of the clearance groove is R1, and the diameter of the impeller body is Z, where Z / (2*R1)≤0.95.

[0013] In this scheme, the clearance groove is concentrically set with the impeller body. When the radius R1 of the clearance groove and the diameter Z of the impeller body satisfy the above relationship, it is ensured that the curvature of the clearance groove is greater than the curvature of the impeller body, thereby preventing interference during the movement and rotation of the impeller body.

[0014] Preferably, the wall of the opening is formed by at least two arc segments with different radii, and the radius of the arc segment closer to the clearance groove is greater than the radius of the arc segment farther away from the clearance groove.

[0015] In this design, the opening, using the aforementioned structural form, will be elliptical or other irregular in shape. Compared to a circle, an elliptical or other irregular shape increases the opening area, which facilitates the smooth removal of the impeller body from the opening. Since the impeller body will flip during removal, the radius of the arc segment near the clearance groove is set relatively large, providing sufficient space for the impeller body to flip, ensuring that the impeller body does not interfere with the wall of the opening during the flipping process.

[0016] Preferably, the wall of the opening is formed by a first arc segment and a second arc segment, the radius of the first arc segment is R2, the radius of the second arc segment is R3, and the diameter of the impeller body is Z, where R2=Z / 2+3mm, Z / (2*R3)≤0.95.

[0017] In this scheme, when the radius R2 of the first arc segment and the radius R3 of the second arc segment satisfy the above relationship, the impeller body can prevent interference with the wall of the opening when it is flipped.

[0018] Preferably, the length of the overlap between the orthographic projection of the impeller body along the axial direction of the impeller body and the orthographic projection of the fan frame along the axial direction of the impeller body is L1, and the distance between the center of the first arc segment and the center of the second arc segment is L2, where L2 > L1 + 2 mm.

[0019] Preferably, the volute includes a rear cover facing away from the opening, and along the axial direction of the impeller body, the gap between the impeller body and the rear cover is greater than or equal to 8 mm; the dimension of the volute along the axial direction of the impeller body is W, and the dimension of the impeller body along the axial direction of the impeller body is H, wherein W≤135 mm and H≤W-8 mm.

[0020] In this design, reducing the volute thickness W leads to a decrease in the impeller height H, especially when W is less than 135mm, which results in a significant performance degradation of the fan assembly. When W ≤ 135mm, ensuring the impeller height H ≤ W - 8mm allows the impeller to reach its maximum size within that volute thickness, thus maintaining the impeller's overall volume and achieving optimal performance.

[0021] Preferably, the range hood further includes a mounting platform, which is disposed on the side of the volute housing where the opening is located. The mounting platform extends from the side of the volute housing away from the volute housing and is used to install an air inlet ring. An oil filter is installed at the opening.

[0022] In this solution, the air inlet ring is installed using an installation platform, which ensures a smooth and flush fit between the air inlet ring and the air inlet. On the other hand, the installation platform also ensures that the air inlet ring does not come into contact with the oil filter, thus guaranteeing a high filtration effect.

[0023] Preferably, the volute has a cover portion located inside the fan frame, and there is a gap between the outer wall of the cover portion and the inner wall of the fan frame, the gap being greater than or equal to 3 mm.

[0024] The positive and progressive effects of this invention are as follows:

[0025] This invention achieves an overlap between the orthographic projection of the impeller body along its axial direction and the orthographic projection of the fan frame along its axial direction. In other words, a portion of the impeller body is located within the fan frame. Compared to a design where the entire impeller body is located inside the volute, this invention cleverly utilizes the space within the fan frame to house a portion of the impeller body. This helps reduce the overall dimensions in the height direction, thus reducing the size of the range hood while maintaining the fan's overall volume.

[0026] This invention also includes a clearance groove on the side of the fan frame near the opening, and sets the motor to have a first shaft segment and a second shaft segment with different diameters. The distance E between the side of the volute with the opening and the side plate of the fan frame with the clearance groove is greater than the length A of the first shaft segment. Therefore, when the impeller body needs to be removed, it can be moved horizontally outward to the second shaft segment. Since the diameter of the second shaft segment is smaller than that of the first shaft segment, the impeller body can move downward a short distance after translating to the second shaft segment. Then, the impeller body can be flipped towards the clearance groove, and removed through the opening and clearance groove, thus achieving detachable cleaning of the impeller body. E < A + B makes the range hood structure more compact, thereby reducing the overall front-to-back dimensions. If E > A + B, the impeller body can be removed after horizontal and vertical translation, without rotation; however, this does not improve the structural compactness and therefore cannot reduce the overall size of the range hood. This invention's range hood maintains the fan volume, reduces the size of the range hood, and also allows for detachable cleaning of the impeller body. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a range hood according to a preferred embodiment of the present invention.

[0028] Figure 2This is a schematic diagram of the structure of the wind turbine frame according to a preferred embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the volute casing according to a preferred embodiment of the present invention, in which the rear cover is hidden.

[0030] Figure 4 This is a partial enlarged view of a range hood according to a preferred embodiment of the present invention.

[0031] Figure 5 This is a cross-sectional structural diagram of a range hood according to a preferred embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the structure of a motor according to a preferred embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures

[0034] 100 range hoods

[0035] Fan assembly 1

[0036] Impeller body 11

[0037] Motor 12

[0038] First section 121

[0039] Second section 122

[0040] 13 worm shell

[0041] Opening 131

[0042] First arc segment 1311

[0043] Second arc segment 1312

[0044] Back cover 132

[0045] Wind turbine frame 2

[0046] Side panel 21

[0047] 211 clearance slot

[0048] Mounting Platform 3 Detailed Implementation

[0049] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0050] like Figures 1-6As shown, this embodiment discloses a range hood 100, including a fan assembly 1 and a fan frame 2, with the fan frame 2 surrounding the fan assembly 1. The fan assembly 1 includes an impeller body 11, a motor 12, and a volute 13. The volute 13 has an opening 131 for the impeller body 11 to enter and exit. The motor 12 drives the impeller body 11. The orthographic projection of the impeller body 11 along its axial direction overlaps with the orthographic projection of the fan frame 2 along its axial direction. The side plate of the fan frame 2 near the opening 131... 21 is provided with a clearance groove 211, which extends upward from the bottom of the fan frame 2; along the inside of the volute 13 toward the opening 131, the motor 12 includes a first shaft section 121 and a second shaft section 122. The diameter of the first shaft section 121 is larger than the diameter of the second shaft section 122. The length of the first shaft section 121 is A, the length of the second shaft section 122 is B, and the distance between the side of the volute 13 with the opening 131 and the side of the fan frame 2 with the clearance groove 211 is E, where A < E < A + B.

[0051] By making the orthographic projection of the impeller body 11 along the axial direction of the impeller body 11 overlap with the orthographic projection of the fan frame 2 along the axial direction of the impeller body 11, that is, a part of the impeller body 11 is located inside the fan frame 2. Compared with the impeller body 11 being entirely located inside the volute 13, this embodiment cleverly utilizes the space of the fan frame 2 to set part of the impeller body 11, which helps to reduce the overall size in the height direction, thus reducing the size of the range hood 100 while ensuring the size of the fan body.

[0052] In this embodiment, a clearance groove 211 is also provided on the side of the fan frame 2 near the opening 131, and the motor 12 is configured with a first shaft segment 121 and a second shaft segment 122 with different diameters (e.g., Figure 5 and Figure 6As shown), the distance E between the side of the volute 13 with the opening 131 and the side plate 21 of the fan frame 2 with the clearance groove 211 is greater than the length A of the first shaft section 121. Therefore, when it is necessary to remove the impeller body 11, the impeller body 11 can be moved horizontally outward to the second shaft section 122. Since the diameter of the second shaft section 122 is smaller than the diameter of the first shaft section 121, the impeller body 11 can be moved downward a short distance after being moved to the second shaft section 122. Then, the impeller body 11 can be flipped in the direction of the clearance groove 211, and the impeller body 11 can be removed through the opening 131 and the clearance groove 211 (that is, the top of the impeller body 11 extends out from the opening 131 and the clearance groove 211, and the bottom of the impeller body 11 moves in the opposite direction as the top moves). This achieves the detachable cleaning of the impeller body 11. E < A + B makes the structure of the range hood 100 more compact, thereby reducing the overall front and rear dimensions of the machine. If E is greater than A+B, the impeller body 11 can be removed after horizontal and vertical translation, meaning it can be removed without rotation. However, this does not improve the structural compactness, and therefore the overall size of the range hood 100 cannot be reduced. In this embodiment, the range hood 100 maintains the fan volume, reduces the size of the range hood 100, and also allows the impeller body 11 to be disassembled and cleaned.

[0053] like Figure 5 As shown, the angle between the clearance groove 211 and the opening 131 is α, the diameter of the first shaft segment 121 is C, and the diameter of the second shaft segment 122 is D, where π / 2-α≤arctan((CD) / (2*B)). Specifically, the angle between the highest point of the clearance groove 211 and the highest point of the opening 131 is α, and at this angle, the impeller body 11 can be easily disassembled.

[0054] The length A of the first shaft segment 121 is 29.5 mm, the diameter C of the first shaft segment 121 is 12 mm, the length A of the second shaft segment 122 is 11 mm, the diameter D of the second shaft segment 122 is 8 mm, and the range of E is 30≤E≤42.

[0055] The side plate 21 of the fan frame 2 has an inner side and an outer side. The clearance groove 211 extends gradually from the outer side to the inner side towards the top of the side plate 21. That is, the clearance groove 211 is inclined, and the clearance groove 211 is deeper on the side closer to the impeller body 11 (i.e., closer to the top of the side plate 21), while the clearance groove 211 is shallower on the side away from the impeller body 11. Therefore, when the impeller body 11 is flipped in the direction of the clearance groove 211, the inclined clearance groove 211 fits the flipping path of the impeller body 11 more closely, which helps to ensure the smooth flipping of the impeller body 11 and thus ensures the smooth disassembly of the impeller body 11. On the other hand, setting the clearance groove 211 to be inclined can also ensure the overall strength of the fan frame 2. If the size of the clearance groove 211 is large in order to make the impeller body 11 easy to disassemble, although the smooth flipping of the impeller body 11 is ensured, it will affect the strength of the fan frame 2.

[0056] The cross-section of the clearance groove 211 is arc-shaped. The orthographic projection of the center of the clearance groove 211 along the axial direction of the impeller body 11 coincides with the orthographic projection of the center of the impeller body 11 along the axial direction of the impeller body 11. The radius of the clearance groove 211 is R1, and the diameter of the impeller body 11 is Z, where Z / (2*R1)≤0.95. That is, the clearance groove 211 and the impeller body 11 are concentrically arranged. When the radius R1 of the clearance groove 211 and the diameter Z of the impeller body 11 satisfy the above relationship, it ensures that the curvature of the clearance groove 211 is greater than the curvature of the impeller body 11, thereby preventing interference during the movement and rotation of the impeller body 11. The above values ​​take into account machining and assembly errors. If errors occur during machining and assembly, they will not cause interference between the impeller body 11 and the clearance groove 211.

[0057] The wall of opening 131 can be formed by at least two arc segments with different radii. The radius of the arc segment closer to the clearance groove 211 is larger than the radius of the arc segment farther from the clearance groove 211. This results in opening 131 being elliptical or other irregular shapes. Compared to a circle, an elliptical or other irregular shape increases the area of ​​opening 131, which facilitates the smooth removal of the impeller body 11 from opening 131. Since the impeller body 11 in this embodiment will be flipped during removal, setting the radius of the arc segment closer to the clearance groove 211 to be larger provides space for the impeller body 11 to flip, preventing interference between the impeller body 11 and the wall of opening 131 during the flipping process.

[0058] In this embodiment, the wall of the opening 131 is formed by a first arc segment 1311 and a second arc segment 1312. The radius of the first arc segment 1311 is R2, the radius of the second arc segment 1312 is R3, and the diameter of the impeller body 11 is Z, where R2 = Z / 2 + 3 mm, and Z / (2*R3) ≤ 0.95. When the radius R2 of the first arc segment 1311 and the radius R3 of the second arc segment 1312 satisfy the above relationship, the impeller body 11 can prevent interference with the wall of the opening 131 when it flips. The above values ​​take into account machining and assembly errors. If errors occur during machining and assembly, they will not cause interference between the impeller body 11 and the opening 131. In other embodiments, the wall of the opening 131 can also be formed by more arc segments.

[0059] like Figure 2 and Figure 5 As shown, the length of the overlap between the orthographic projection of the impeller body 11 along the axial direction of the impeller body 11 and the orthographic projection of the fan frame 2 along the axial direction of the impeller body 11 is L1, that is, the distance by which the impeller body 11 is covered by the fan frame 2 is L1. The distance between the center of the first arc segment 1311 and the center of the second arc segment 1312 is L2, where L2 > L1 + 2mm. Only when the eccentricity satisfies this relationship can the impeller body 11 be successfully removed.

[0060] In this embodiment, the volute tongue clearance is greater than 12mm, which helps to prevent oil clogging, thereby helping to avoid impeller body 11 failure and extending the service life of impeller body 11.

[0061] The volute 13 includes a rear cover 132 facing away from the opening 131. Along the axial direction of the impeller body 11, the gap between the impeller body 11 and the rear cover 132 is greater than or equal to 8 mm. The dimension of the volute 13 along the axial direction of the impeller body 11 is W (i.e., volute thickness), and the dimension of the impeller body 11 along the axial direction of the impeller body 11 is H (i.e., impeller height), where W ≤ 135 mm and H ≤ W - 8 mm. A decrease in the volute thickness W leads to a decrease in the height H of the impeller body 11, especially when the volute thickness W is less than 135 mm, which causes a significant performance degradation in the fan assembly 1. When W ≤ 135 mm, ensuring that the height H of the impeller body 11 is ≤ W - 8 mm allows the impeller body 11 to reach its maximum size at that volute thickness, thus guaranteeing the volume of the impeller body 11 at that volute thickness and achieving optimal performance at that volute thickness.

[0062] The range hood 100 also includes a mounting platform 3, which is located on the side of the volute 13 with an opening 131. The mounting platform 3 extends from the side of the volute 13 away from it and is used to install the air inlet ring. An oil filter is installed at the opening 131. Installing the air inlet ring using the mounting platform 3 ensures a smooth and flush fit between the air inlet ring and the air inlet. Furthermore, the mounting platform 3 prevents the air inlet ring from contacting the oil filter, guaranteeing a high filtration effect. Additionally, since the oil filter and air inlet ring have different spacing in different areas, the height of the mounting platform 3 can be set relatively small, allowing the closest distance between the oil filter and the air inlet ring to be approximately zero. This means that while there is a gap between the oil filter and the air inlet ring, this gap is compressed to near zero, thus simultaneously meeting the requirements of high filtration effect and optimal size and performance.

[0063] like Figure 1 As shown, the spacing between different areas of the oil filter and the air inlet ring is related to the air intake volume of different areas of the volute 13. With the eccentric setting of the volute 13 and the impeller body 11, the range hood can achieve a good oil fume extraction effect and a high oil fume separation effect on both the left and right stoves.

[0064] The volute 13 has a covering portion located inside the fan frame 2. There is a gap between the outer wall of the covering portion and the inner wall of the fan frame 2, which is greater than or equal to 3mm, so that the volute 13 and the fan frame 2 will not interfere with each other. The width of the fan frame 2 can be 480mm-500mm.

[0065] The range hood 100 includes a rear panel. The distance between the rear cover 132 of the volute 13 and the rear panel is F. In order to meet the installation requirements of the volute 13 and the gap between the motor 12 and the rear panel is greater than or equal to 3mm, the range of distance F is 15≤F≤20.

[0066] The fan assembly 1 and the range hood 100 in this embodiment, through the above-mentioned dimensions, achieve a significant reduction in the overall front and rear dimensions of the machine while meeting performance requirements. At the same time, they ensure the fan size, reduce the size of the range hood 100, and allow the impeller body 11 to be disassembled and cleaned.

[0067] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A range hood, characterized in that, It includes a fan assembly and a fan frame, the fan frame being arranged above the fan assembly; The fan assembly includes an impeller body, a motor, and a volute. The volute has an opening for the impeller body to enter and exit. The motor drives the impeller body. The orthographic projection of the impeller body along its axial direction overlaps with the orthographic projection of the fan frame along its axial direction. A clearance groove is provided on one side plate of the fan frame near the opening. The clearance groove extends upward from the bottom of the fan frame. Along the direction from the inside of the volute toward the opening, the motor includes a first shaft segment and a second shaft segment. The diameter of the first shaft segment is greater than the diameter of the second shaft segment. The length of the first shaft segment is A, and the length of the second shaft segment is B. The distance between the side of the volute with the opening and the side of the fan frame with the clearance groove is E, where A < E < A + B.

2. The range hood as claimed in claim 1, characterized in that, The angle between the clearance groove and the opening is α, the diameter of the first shaft segment is C, and the diameter of the second shaft segment is D, where π / 2-α≤arctan((CD) / (2*B)).

3. The range hood as claimed in claim 1, characterized in that, The side plate of the wind turbine frame has an inner side and an outer side, and the clearance groove extends gradually from the outer side to the inner side towards the top of the side plate.

4. The range hood as claimed in claim 1, characterized in that, The cross-section of the clearance groove is arc-shaped. The orthographic projection of the center of the clearance groove along the axial direction of the impeller body coincides with the orthographic projection of the center of the impeller body along the axial direction of the impeller body. The radius of the clearance groove is R1, and the diameter of the impeller body is Z, where Z / (2*R1)≤0.

95.

5. The range hood as claimed in claim 1, characterized in that, The wall of the opening is formed by at least two arc segments with different radii, and the radius of the arc segment closer to the clearance groove is greater than the radius of the arc segment farther away from the clearance groove.

6. The range hood as claimed in claim 1, characterized in that, The wall of the opening is formed by a first arc segment and a second arc segment, the radius of the first arc segment is R2, the radius of the second arc segment is R3, and the diameter of the impeller body is Z, where R2=Z / 2+3mm, Z / (2*R3)≤0.

95.

7. The range hood as claimed in claim 6, characterized in that, The length of the overlap between the orthographic projection of the impeller body along the axial direction of the impeller body and the orthographic projection of the fan frame along the axial direction of the impeller body is L1, and the distance between the center of the first arc segment and the center of the second arc segment is L2, where L2 > L1 + 2mm.

8. The range hood as claimed in claim 1, characterized in that, The volute includes a rear cover facing away from the opening. Along the axial direction of the impeller body, the gap between the impeller body and the rear cover is greater than or equal to 8 mm. The dimension of the volute along the axial direction of the impeller body is W, and the dimension of the impeller body along the axial direction of the impeller body is H, where W≤135 mm and H≤W-8 mm.

9. The range hood as claimed in claim 1, characterized in that, The range hood also includes a mounting platform, which is located on the side of the volute housing with an opening. The mounting platform extends from the side of the volute housing away from the volute housing and is used to install an air inlet ring. An oil filter is installed at the opening.

10. The range hood as claimed in claim 1, characterized in that, The volute has a covering portion located inside the fan frame, and there is a gap between the outer wall of the covering portion and the inner wall of the fan frame, the gap being greater than or equal to 3 mm.

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