A range hood

Abstract

This utility model discloses a range hood, comprising: a first housing; a second housing, wherein the first housing is at least partially located below the second housing and covers the outer periphery of the second housing, and the first housing is movable relative to the second housing; a fan system disposed within the second housing, the axis of the fan system extending forward and backward; a smoke collection hood disposed at the bottom of the first housing, the smoke collection hood having a smoke inlet; a first ventilation component disposed at the smoke inlet; and a second ventilation component located downstream of the first ventilation component in the smoke flow path; in a horizontal projection, the second ventilation component is connected to the bottom of the second housing, the second ventilation component comprising a first ventilation component body and a second ventilation component body arranged forward and backward, the first ventilation component body gradually tilting downward from front to back, and the second ventilation component body extending backward from the rear end of the first ventilation component body.

Description

Technical Field

[0001] This utility model relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. Generally, range hoods include top-mounted and side-mounted types. Top-mounted range hoods are increasingly widely used due to their neat appearance, lightweight design, and small footprint. A typical top-mounted range hood consists of a smoke collection hood, a fan housing located on top of the hood, and inside the fan housing are a volute, an impeller, and a motor that drives the impeller.

[0003] Due to the requirements of the oil circuit, top-mounted range hoods usually need to be equipped with double-layer mesh (or one layer is a plate) to prevent oil from dripping through the filter screen inside the casing. For example, the Chinese patent application number 202321376010.6 disclosed by the applicant discloses a lifting range hood, which includes a fan frame and an outer casing. The bottom of the outer casing has a smoke inlet, and a lower plate is installed at the smoke inlet. The lower plate has a lower air inlet hole. An upper plate is fixed to the bottom of the fan frame. The upper plate has an upper air inlet hole. Both the upper and lower plates have a concave structure from the left and right sides towards the middle, and the vertical projections of the upper and lower air inlets are offset from each other. The outer casing can move up and down relative to the fan frame under the drive of the drive mechanism. When the machine is turned on, the outer casing descends to form a smoke inlet chamber between the upper and lower plates. When the machine is turned off, the outer casing rises so that the lower plate is close to the upper plate.

[0004] This type of range hood has a dual-intake fan system, with the filter (plate) recessed from the middle of both sides. The filter guide is not aligned with the axis of the fan system, which prevents the filter from effectively guiding the rising airflow into the fan system through the front and rear intakes. Furthermore, since the inner first ventilation components (upper and lower plates) are recessed from the middle of both sides with the same extension direction and consistent spacing at all positions, the air intake resistance is high when the descent distance is short, further hindering the entry of fumes into the front intake of the fan system. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a range hood that promotes the entry of oil fumes into the intake port at the front of the fan system, thereby improving the oil fume extraction effect.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a range hood, comprising:

[0007] First shell;

[0008] The second housing, wherein the first housing is at least partially located below the second housing and covers the outer periphery of the second housing, and the first housing is capable of being raised and lowered relative to the second housing;

[0009] A fan system is housed within a second housing, with the fan system's axis extending forward and backward.

[0010] A smoke collection hood is located at the bottom of the first housing, and the smoke collection hood is provided with a smoke inlet;

[0011] A first ventilation component is disposed at the smoke inlet; and

[0012] The second ventilation component is located downstream of the first ventilation component in the oil fume flow path;

[0013] Its features are:

[0014] The second ventilation component is connected to the bottom of the second housing. The second ventilation component includes a first ventilation component body and a second ventilation component body arranged front to back. The first ventilation component body gradually slopes downward from front to back, and the second ventilation component body extends backward from the rear end of the first ventilation component body.

[0015] By setting up two layers of mesh, a second ventilation component and a first ventilation component, that can rise and fall relative to each other, and by having the second ventilation component wrap around the bottom edge of the second housing, and by having the second ventilation component consist of at least two parts in the front-to-back direction, with the first ventilation component body located at the front gradually tilting downwards from front to back, the oil flowing down the inner wall of the second housing can be caught by the second ventilation component and guided to the side wall of the housing, thus preventing the first ventilation component from dripping through it when it is lowered. Simultaneously, the tilted arrangement of the first ventilation component body matches the arrangement of the fan system, not only guiding the fumes forward and upward to the intake port at the front of the fan system when passing through this point, but also increasing the distance between it and the first ventilation component, reducing air resistance during air intake, and further facilitating the intake of fumes into the intake port at the front of the fan system.

[0016] Preferably, a smoke collection chamber is formed inside the smoke collection hood, and the smoke inlet is formed at the top of the smoke collection chamber. By forming an upward-converging smoke collection chamber, the smoke can be collected to prevent the fumes from escaping when they come into contact with the smoke collection hood. Moreover, because it is upward-converging, it avoids being exposed at the bottom of the smoke collection hood, thus better concealing the lifting smoke machine.

[0017] Furthermore, the second ventilation component body of the second ventilation component gradually slopes downwards from the rear end of the first ventilation component body. The smoke collection hood has at least two sidewalls constituting the smoke collection chamber. At least one of these sidewalls slopes in the same direction as the second ventilation component body of the second ventilation component. By making the second ventilation component body of the second ventilation component also slope downwards, the oil collected by the second ventilation component can be guided backwards to enter the oil cup, which is usually located at the rear, thus preventing the oil on the second ventilation component from dripping downwards in the middle. Moreover, the inner first ventilation component has a similarly sloped portion, which allows the first housing to be as close as possible to the second housing when it rises, resulting in a smaller height and a more compact overall design for the range hood in this state (usually the off state).

[0018] Preferably, the fan system includes a first intake port located at the rear as the main intake port and a second intake port located at the front as the auxiliary intake port. A first air intake channel is formed between the first intake port of the fan system and the rear wall of the second housing, and a second air intake channel is formed between the second intake port of the fan system and the front wall of the second housing. The depth of the first air intake channel in the front-rear direction is greater than the depth of the second air intake channel in the front-rear direction. The convex shape of the smoke collection chamber, in coordination with the dual air intake of the fan system, protrudes downward relative to the smoke collection chamber, reducing the backward flow of oil fumes when passing through the smoke collection chamber, allowing them to pass directly upward through the smoke collection chamber, thereby facilitating the entry of oil fumes from the first intake port at the rear.

[0019] Furthermore, the second ventilation component body of the second ventilation component gradually tilts downwards from the rear end of the first ventilation component body. The tilt angle of the first ventilation component body is greater than the tilt angle of the second ventilation component body. This allows the oil received by the second ventilation component to be guided backwards into the oil cup, which is usually located at the rear, thus preventing the oil on the second ventilation component from dripping downwards in the middle. Moreover, the tilt angle of the second ventilation component body is smaller than that of the first ventilation component body, which reduces the tendency of the oil fumes to be guided forward, so as to guide the oil fumes to the intake port at the rear of the fan system.

[0020] Preferably, the fan system includes a volute, and in the horizontal projection, the front end of the second ventilation component is located on the front side of the volute of the fan system, thereby minimizing its impact on the flow of oil fumes to the rear intake while ensuring that the oil fumes are guided into the front intake of the fan system.

[0021] Furthermore, to facilitate the lifting and lowering of the first housing, the range hood also includes a motion mechanism for driving the lifting and lowering of the first housing. The motion mechanism includes a motor, a lead screw driven by the motor, and a nut threaded onto and connected to the lead screw. The nut thread is directly or indirectly connected to the first housing. The lead screw is arranged on the rear side of the second housing, and a protective shell is provided on the outside of the lead screw. Since the range hood is usually mounted on the wall on the rear side, placing the motion mechanism on the rear side can take advantage of the relatively stable characteristics of the rear side and avoid the instability that exists on the front side, or even the risk of the range hood tipping forward.

[0022] Furthermore, the fan system includes a first intake port located at the rear as the main intake port and a second intake port located at the front as the auxiliary intake port. A first air intake channel is formed between the first intake port of the fan system and the rear wall of the second housing, and a second air intake channel is formed between the second intake port of the fan system and the front wall of the second housing. The depth of the first air intake channel in the front-rear direction is greater than the depth of the second air intake channel in the front-rear direction. Since the moving mechanism is located at the rear, it will occupy a certain space in the air intake channel. If the auxiliary intake port is opposite to the moving mechanism, the moving mechanism will occupy too much space in the air intake channel, causing greater resistance to the flow of oil fumes. Therefore, the main intake port of the fan system is opposite to the moving mechanism, and the depth of the air intake channel is much greater than the depth of the moving mechanism, reducing the impact of the moving mechanism.

[0023] Compared with the prior art, the advantages of this utility model are as follows: By setting two layers of nets, a second ventilation component and a first ventilation component, which can be raised and lowered relative to each other, and by having the second ventilation component wrap around the bottom edge of the second housing, and by having the second ventilation component consist of at least two parts in the front-to-back direction, with the body of the first ventilation component located at the front gradually tilting downwards from front to back, the oil flowing down the inner wall of the second housing can be received by the second ventilation component and guided to the side wall of the housing, thus preventing the first ventilation component from dripping through the inner first ventilation component when it is lowered; at the same time, the tilting of the body of the first ventilation component matches the arrangement of the fan system, which not only guides the fumes forward and upward to the intake port at the front of the fan system when they pass through this point, but also increases the distance between it and the first ventilation component, reduces the resistance during air intake, and further facilitates the intake of fumes into the intake port at the front of the fan system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram (second state) of a range hood according to an embodiment of the present utility model;

[0025] Figure 2This is a schematic diagram of a range hood according to an embodiment of the present utility model (second state, viewed from back to front, with the second housing portion hidden);

[0026] Figure 3 This is an exploded structural diagram of the range hood according to an embodiment of the present utility model;

[0027] Figure 4 This is a cross-sectional view (second state, front and rear section) of the range hood according to an embodiment of the present utility model;

[0028] Figure 5 for Figure 4 A magnified schematic diagram of part I;

[0029] Figure 6 This is a schematic diagram of the second ventilation component of the range hood according to an embodiment of the present utility model;

[0030] Figure 7 This is a cross-sectional view (left-right section) of the second housing, motion mechanism, and second ventilation component of the range hood according to an embodiment of the present utility model;

[0031] Figure 8 for Figure 7 A magnified schematic diagram of part II;

[0032] Figure 9 This is a schematic diagram (first state) of a range hood according to an embodiment of the present utility model;

[0033] Figure 10 This is a cross-sectional view (first state, front and back section) of the range hood according to an embodiment of the present utility model. Detailed Implementation

[0034] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0036] See Figures 1-10 A range hood, specifically a top-mounted range hood, includes an outer casing comprising a first housing 11 and a second housing 12. The first housing 11 at least partially covers the outer periphery of the second housing 12 and is at least partially located below the second housing 12. The second housing 12 can be fixed to an external mounting base, such as a wall, while the first housing 11 can be raised and lowered relative to the second housing 12. Both the first housing 11 and the second housing 12 are hollow structures, fluidly connected to each other, and preferably have rectangular horizontal cross-sections. Both the first housing 11 and the second housing 12 are generally hollow cuboids, with their width and depth being substantially the same in the height direction. The dimensions (width and depth) of the first housing 11 and the second housing 12 are also similar, sufficient to satisfy the installation clearance and the ability of the first housing 11 to be raised and lowered relative to the second housing 12. A smoke collection hood 6 is provided at the bottom of the first housing 11, within which a smoke collection chamber 61 is formed that rises upwards from the bottom surface. A smoke inlet 62 is formed at the top of the smoke collection chamber 61. By forming an upward-converging smoke collection chamber 61, the smoke can be collected, preventing the fumes from escaping when they come into contact with the smoke collection hood 6. Moreover, because it is upward-converging, it avoids being exposed at the bottom of the smoke collection hood 6, thus better concealing the lifting smoke machine.

[0037] The range hood also includes a fan system 2 and a ventilation assembly. The fan system 2 is at least partially housed within the second housing 12. In this embodiment, the fan system 2 is a centrifugal fan with its axis extending forward and backward (X). The fan system 23 includes a volute 23. In this embodiment, the volute 23 has a first intake 21 serving as the main intake and a second intake 22 serving as the auxiliary intake. The first intake 21 is located at the rear, while the second intake 22 is located at the front. A first air intake channel 121 is formed between the first intake 21 of the fan system 2 and the rear wall of the second housing 12. A second air intake channel 122 is formed between the second intake 22 of the fan system 2 and the front wall of the second housing 12. The depth of the first air intake channel 121 in the forward and backward direction is greater than the depth of the second air intake channel 122 in the forward and backward direction. Optionally, the depth of the first air intake channel 121 is 200 mm, while the depth of the second air intake channel 122 is 70 mm.

[0038] The ventilation assembly includes a first ventilation component 31 and a second ventilation component 32. The first ventilation component 31 is located at the smoke inlet 62, while the second ventilation component 32 is located at the bottom of the second housing 12 and is connected to the bottom of the second housing 12, thereby collecting oil flowing down from the inner wall of the second housing 12 and the fan system 2. The second ventilation component 32 and the second housing 12 can be directly or indirectly connected, either inside or outside the second housing 12. To ensure that the second ventilation component 32 can collect oil flowing down from the inner wall of the second housing 12, when the connection point is inside the second housing 12, the second ventilation component 32 or an additional connecting piece contacts the inner wall of the second housing 12; when the connection point is outside the second housing 12, the second ventilation component 32 or the additional connecting piece at least partially covers the bottom edge of the second housing 12 in the horizontal projection. In this embodiment, the front and rear sides of the second ventilation component 32 are connected to the inner side of the second housing 12, while the left and right sides are connected to the lower side of the second housing 12. See [reference needed]. Figure 5 The connection point on the front side of the second ventilation component 32 is located on the rear side of the front wall of the second housing 12, and the two can be fixed by screws extending forward and backward. See also Figure 8 The connection point on the right side of the second ventilation component 32 is located below the right side wall of the second housing 12 (a flange can be formed here), and the two can be fixed by screws extending vertically.

[0039] An oil cup 4 is provided at the bottom rear side of the first housing 11 to collect oil flowing down from the inner wall of the housing, ventilation components and fan system 2.

[0040] The smoke hood 6 has at least two sidewalls constituting the smoke collection chamber 61. In this embodiment, the smoke collection chamber 61 is formed by a front sidewall 611, a rear sidewall 612, a left sidewall 613, and a right sidewall 614. The front sidewall 611 extends upwards gradually from front to rear, the rear sidewall 612 extends downwards gradually from the rear end of the front sidewall 611, the left sidewall 613 is located at the left end of the front sidewall 611 and the rear sidewall 612, and the right sidewall 614 is located at the right end of the front sidewall 611 and the rear sidewall 612. The smoke inlet 62 is located on the rear sidewall 612. The left sidewall 613 and the right sidewall 614 gradually slope upwards towards each other. Alternatively, the smoke inlet 62 may be provided on at least one of the front sidewall 611, the rear sidewall 612, the left sidewall 613, and the right sidewall 614. Each sidewall may be a flat plate or a curved plate. In the horizontal projection, the front end of the front side wall 611 is located in front of the first housing 11, the left end of the left side wall 613 is located on the left side of the first housing 11, and the right end of the right side wall 614 is located on the right side of the first housing 11.

[0041] In this embodiment, the first ventilation component 31 is generally flat, and the second ventilation component 32 includes a first ventilation component body 321 and a second ventilation component body 322 arranged front to back. The upper end of the first ventilation component body 321 can extend to the bottom of the second housing 12 and be fixed thereto. The first ventilation component body 321 gradually slopes downward from front to back, and the second ventilation component body 322 extends downward from the rear end of the first ventilation component body 321. The rear sidewall 612 constituting the smoke collection chamber 61 can slope in the same direction as the second ventilation component body 322, and the two can be parallel to each other or have a small angle between them. The slope angle of the second ventilation component body 322 is smaller than that of the first ventilation component body 321, which can reduce the tendency of the oil fume to be guided forward, so as to guide the oil fume to the second intake port 21 at the rear of the fan system 2. Preferably, the rear end of the first ventilation component body 321 is located on the front side of the volute 23, thereby minimizing its impact on the flow of oil fumes to the rear first intake 21 while ensuring that the oil fumes are guided into the second intake 22 at the front of the fan system 2. In this embodiment, both the first ventilation component 31 and the second ventilation component 32 are filters, but alternatively, they can be formed by openings in a plate.

[0042] Range hoods should have at least two of the following states, see below. Figure 9 and Figure 10At this time, the range hood is in its first state, which is usually a non-working state. The first housing 11 rises, and the second ventilation component 32 and the first ventilation component 31 are in close proximity. Because the inner first ventilation components have the same inclined portion (the second ventilation component body 321 of the first ventilation component 31 and the second ventilation component 32), the first housing 11 can be brought as close as possible to the second housing 12 when it rises, resulting in a smaller height and a more compact overall design for the range hood in this state (usually the off state). See also Figures 1-4 At this time, the range hood is in the second state, which is usually the working state. The first housing 11 is lowered, the second ventilation component 32 and the first ventilation component 31 are separated, and the effective ventilation area of ​​the second ventilation component 32 and the first ventilation component 31 is increased, which helps to reduce the air intake resistance and improve the smoke extraction effect.

[0043] In this invention, the second ventilation component 32 is composed of at least two parts in the front-to-back direction, which matches the arrangement of the fan system 2. The inclined arrangement of the first ventilation component body 321 located at the front not only allows the fumes to be guided forward and upward to the second intake port 22 at the front of the fan system 2 when passing through this point, but also increases the distance between it and the first ventilation component 31, reduces the resistance when the air is inlet, and further helps the fumes to be drawn into the second intake port 22 at the front of the fan system 2.

[0044] The range hood also includes a motion mechanism for driving the first housing 11 (along with the smoke collection hood 6 and the first ventilation component 31) to rise and fall. The motion mechanism includes a motor 71 and a lead screw 72. The motor 71 can be fixedly mounted on the top of the second housing 12, while the lead screw 72 extends vertically and is rotatably mounted on the rear wall of the second housing 12. The lead screw 72 can be driven by the motor 71 to rotate around its own axis. The first housing 11 can be directly or indirectly threadedly connected to the lead screw 72, such as by fixing a nut 73 to the first housing 11. The motor 71, lead screw 72, and nut 73 constitute a linear drive module. The nut 73 is sleeved on and threadedly connected to the lead screw 72, thus, when the lead screw 72 rotates, the nut 73 drives the first housing 11 to rise and fall. To ensure stable operation of the first housing 11, guide rail assemblies 75 are typically provided on the left and right sides of the second housing 12 and the first housing 11.

[0045] To improve the reliability of the lead screw 72, it is generally prevented from contacting the oil fumes inside the range hood. Therefore, the moving mechanism also includes a protective shell 74. The protective shell 74 has a "U"-shaped cross-section. The protective shell 74 mates with the rear wall of the second shell 12, enclosing the lead screw 72 within it, thereby isolating the lead screw 72 from the oil fumes inside the second shell 12. The upper end of the lead screw 72 is rotatably connected to the top of the second shell 12, and the lower end of the lead screw 72 can be rotatably connected to the lower front end of the protective shell 74 (a mounting seat can be provided inside the protective shell 74). The upper end of the protective shell 74 can be equipped with a limiting component or can be directly fixed to the second shell 12 by fasteners.

[0046] The sports apparatus may be the same as the applicant's prior application cited in the background section, and will not be described again here.

[0047] Since range hoods are typically mounted on the wall at the rear, placing the motion mechanism there also utilizes the relative stability of the rear, avoiding the instability and risk of the range hood tipping forward that can occur with a front-mounted mechanism. Because the motion mechanism is at the rear, it occupies space in the air intake duct, typically about 60mm deep. If the secondary intake inlet were positioned opposite the motion mechanism, it would result in the motion mechanism occupying too much space in the air intake duct, creating significant resistance to the flow of cooking fumes. Therefore, by positioning the main intake inlet of the fan system 2 opposite the motion mechanism, the depth of the air intake duct is much greater than the depth of the motion mechanism, minimizing the impact of the motion mechanism on the air intake.

[0048] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A range hood, comprising: First shell (11); The second housing (12) is provided, wherein the first housing (11) is at least partially located below the second housing (12) and covers the outer periphery of the second housing (12), and the first housing (11) is capable of being raised and lowered relative to the second housing (12); A fan system (2) is disposed within a second housing (12), the axis (X) of which extends forward and backward; A smoke hood (6) is provided at the bottom of the first housing (11), and a smoke inlet (62) is provided on the smoke hood (6); A first ventilation component (31) is disposed at the smoke inlet (62); and The second ventilation component (32) is located downstream of the first ventilation component (31) in the oil fume flow path; Its features are: The second ventilation component (32) is connected to the bottom of the second housing (12). The second ventilation component (32) includes a first ventilation component body (321) and a second ventilation component body (322) arranged front to back. The first ventilation component body (321) gradually slopes downward from front to back, and the second ventilation component body (322) extends backward from the rear end of the first ventilation component body (321).

2. The range hood according to claim 1, characterized in that: The smoke collection hood (6) has a smoke collection chamber (61) inside, and the smoke inlet (62) is formed at the top of the smoke collection chamber (61).

3. The range hood according to claim 2, characterized in that: The second ventilation component body (322) of the second ventilation component (32) gradually slopes downward from the rear end of the first ventilation component body (321), and the smoke hood (6) has at least two sidewalls constituting the smoke collection chamber (61), at least one of which is inclined in the same direction as the second ventilation component body (322) of the second ventilation component (32).

4. The range hood according to claim 1, characterized in that: The fan system (2) includes a first intake port (21) located on the rear side as the main intake port and a second intake port (22) located on the front side as the auxiliary intake port. A first air intake channel (121) is formed between the first intake port (21) of the fan system (2) and the rear wall of the second housing (12). A second air intake channel (122) is formed between the second intake port (22) of the fan system (2) and the front wall of the second housing (12). The depth of the first air intake channel (121) in the front-back direction is greater than the depth of the second air intake channel (122) in the front-back direction.

5. The range hood according to claim 1, characterized in that: The second ventilation component body (322) of the second ventilation component (32) gradually tilts downward from the rear end of the first ventilation component body (321), and the tilt angle of the first ventilation component body (321) is greater than the tilt angle of the second ventilation component body (322).

6. The range hood according to claim 5, characterized in that: The fan system (2) includes a volute (23), and in a horizontal projection, the front end of the second ventilation component (32) is located on the front side of the volute (23) of the fan system (2).

7. The range hood according to claim 1, characterized in that: The range hood also includes a motion mechanism for driving the first housing (11) to rise and fall. The motion mechanism includes a motor (71), a lead screw (72) driven by the motor (71) to rotate, and a nut (73) sleeved on the lead screw (72) and threadedly connected to the lead screw (72). The nut (73) is directly or indirectly connected to the first housing (11). The lead screw (72) is arranged on the rear side of the second housing (12). A protective shell (74) is provided outside the lead screw (72).

8. The range hood according to claim 7, characterized in that: The fan system (2) includes a first intake port (21) located on the rear side as the main intake port and a second intake port (22) located on the front side as the auxiliary intake port. A first air intake channel (121) is formed between the first intake port (21) of the fan system (2) and the rear wall of the second housing (12). A second air intake channel (122) is formed between the second intake port (22) of the fan system (2) and the front wall of the second housing (12). The depth of the first air intake channel (121) in the front-back direction is greater than the depth of the second air intake channel (122) in the front-back direction.

Images