Air outlet connector and air draft device with same
The outflow opening with an integrated oil shield redirects oil droplets away from the suction path, addressing the issue of oil dripping onto the stove or cooktop, thereby improving user experience and hygiene.
Patent Information
- Application Number
- CN202422092942.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-27
AI Technical Summary
In existing exhaust devices, oil can easily flow downward along the connecting pipe and drip onto the stove or cooker when the power component stops running, affecting the user experience.
A air outlet joint is designed, with an oil barrier plate and an oil guide structure inside. The oil barrier plate covers the air suction port. The oil guide structure guides the oil into the air collecting chamber to prevent oil from dripping.
It effectively prevents oil from dripping from the suction port to the stove or cookware, improving the hygienic performance of the exhaust device.
Smart Images
Figure CN223106125U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of range hoods, and particularly to an air outlet joint and an air extraction device having the same. Background Art
[0002] The range hood is arranged above the kitchen stove and is used to extract and discharge the oil fume generated during the cooking process when the user cooks food. The air extraction device includes an air collection component, a connecting pipe, and a power component. The air outlet of the air collection component is connected to the power component through the connecting pipe. The air collection component is provided with an air inlet and an air outlet, and the downward projection of the air outlet covers part of the air inlet. When the air extraction device is working, the power component is started, and a negative pressure is formed in the air collection component by the power component. External oil fume is sucked in through the air suction port of the air collection component and discharged to the connecting pipe through the air outlet. When the air extraction device is shut down, the oil in the power component and the oil in the connecting pipe will flow downward along the connecting pipe. When entering the air outlet of the air collection component, it will be guided by the air outlet into the smoke collection cavity of the air collection box component, and then discharged through the oil guide hole at the bottom of the smoke collection cavity. However, when the air outlet joint guides oil, oil droplets will drip downward through the air outlet, and then drip through the part where the air outlet is aligned with the air suction port. When the oil droplets fall on the stove or cooking utensils, it affects the user experience. Summary of the Utility Model
[0003] The purpose of the utility model is to provide an air outlet joint and an air extraction device having the same, which are used to solve the above technical problems.
[0004] According to an embodiment of the utility model, an air outlet joint for an air extraction device is disclosed, including: a joint body, which has an air outlet channel inside, and a first support part and a second support part are provided on the inner side wall surface of the air outlet channel; an oil baffle, whose two ends are connected to the first support part and the second support part, and the downward projection of the oil baffle covers the air suction port of the air extraction device.
[0005] According to an embodiment of the utility model, the two ends of the oil baffle are arcs adapted to the inner wall surface of the air outlet channel. After the two ends of the oil baffle are connected to the first support part and the second support part, the corresponding sides are in contact with the inner wall surface of the air outlet channel.
[0006] According to an embodiment of the utility model, positioning parts and connecting parts are provided on both the first support part and the second support part. Avoidance parts are provided at both ends of the oil baffle to avoid the positioning parts and the connecting parts. The connecting parts are connected to the connecting parts, and the corresponding sides of the oil baffle are pressed between the connecting parts and the connecting parts to fix the oil baffle to the first support part and the second support part.
[0007] According to an embodiment of the present utility model, a first oil guiding portion extends backward from the rear side edge of the oil baffle. The width of the first oil guiding portion in the left-right direction is smaller than the width of the corresponding position of the air outlet channel. After the oil baffle is installed in the air outlet channel, air passing gaps are formed between both sides of the first oil guiding portion and the air outlet channel.
[0008] According to an embodiment of the present utility model, a second oil guiding portion extends from the rear side edge of the first oil guiding portion. The second oil guiding portion is inclined downward from front to rear, and there is an air passing gap between the second oil guiding portion and the air outlet channel.
[0009] The present utility model also provides an air extraction device that uses the above-mentioned air outlet joint. The air extraction device includes a power assembly, a wind collection assembly, and a connecting pipe. The wind collection assembly is provided with an air suction port and an air outlet. The joint body is connected to the air outlet, and the downward projection of the oil baffle covers the air suction port. The power assembly has an air inlet and an air outlet. The air inlet end of the connecting pipe is connected to the joint body, and the air outlet end of the connecting pipe is connected to the air inlet of the power assembly.
[0010] According to an embodiment of the present utility model, a first annular wall extends upward from the outlet end of the air outlet channel of the joint body. A second annular wall that surrounds the first annular wall and a third annular wall that surrounds the second annular wall extend upward from the upper surface of the joint body. A first oil guiding groove is formed between the first annular wall and the second annular wall, and a second oil guiding groove is formed between the second annular wall and the third annular wall. The second oil guiding groove is communicated with the first oil guiding groove, and the first oil guiding groove is communicated with the wall surface of the air outlet channel. The connecting pipe is connected between the second annular wall and the third annular wall.
[0011] According to an embodiment of the present utility model, the first oil guiding groove has an oil outlet, and first diversion grooves extend downward along the inner side wall surface of the air outlet channel on both sides of the oil outlet.
[0012] According to an embodiment of the present utility model, the wall surface of the air outlet channel between the outlets of the first oil guiding groove forms an oil guiding surface, and the downward projection of the oil guiding surface is located behind the air suction port.
[0013] According to an embodiment of the present utility model, an oil outlet hole is provided at the portion of the second annular wall corresponding to the outlet of the first oil guiding groove. The oil outlet hole communicates the second oil guiding groove with the oil guiding surface, and a second diversion groove is provided at the portion of the oil guiding surface corresponding to the oil outlet hole.
[0014] Compared with the prior art, the air outlet joint of the present utility model has the following advantages:
[0015] When the air outlet joint of the present utility model is applied to an exhaust device, the part of the downward projection of the air outlet joint that aligns with the air suction port of the exhaust device is covered by an oil baffle. When the oil in the connecting pipe drips downward through the air outlet joint, at the part that aligns with the oil baffle, the oil droplets are blocked by the oil baffle and cannot drip through the air suction port, which can prevent the oil droplets in the connecting pipe from dripping onto the stove or cooking utensils through the air suction port. Description of the Drawings
[0016] Figure 1 It is a schematic structural diagram of the air outlet joint of the present utility model;
[0017] Figure 2 It is an exploded schematic structural diagram of the air outlet joint of the present utility model;
[0018] Figure 3 It is a schematic structural diagram of a range hood with the air outlet joint of the present utility model;
[0019] Figure 4 For Figure 3 Another perspective structural diagram of the range hood in
[0020] Figure 5 For Figure 4 The sectional view along the line I-I in
[0021] Explanation of the reference numerals in the drawings: 1 - joint body; 1a - first annular wall; 1b - second annular wall; 1c - third annular wall; 11 - first support part; 12 - second support part; 13 - positioning part; 14 - connecting part; 15 - first oil guiding groove; 16 - second oil guiding groove; 17 - first diversion groove; 18 - oil outlet hole; 19 - second diversion groove; 2 - oil baffle; 21 - avoidance part; 22 - first oil guiding part; 23 - second oil guiding part; 3 - power assembly; 4 - air collecting assembly; 41 - air suction port; 5 - connecting pipe.
[0022] The realization and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments
[0023] Hereinafter, multiple embodiments of the present utility model will be disclosed with reference to the drawings. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details are not used to limit the present utility model. That is to say, in some embodiments of the present utility model, these practical details are unnecessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in a simple schematic manner in the drawings.
[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.
[0025] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the meaning of order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0026] To further understand the content, characteristics and effects of the present utility model, the following embodiments are exemplified and described in detail with reference to the attached drawings as follows:
[0027] The present utility model discloses an air outlet joint and an air extraction device having the same. Please refer to Figure 3 and Figure 4 , the air extraction device includes a power component 3, a wind collection component 4 and a connecting pipe 5. The upper part of the wind collection component 4 is provided with an air suction port 41 and an air outlet. The joint body 1 is connected to the air outlet. The power component 3 has an air inlet and an air outlet. The air inlet end of the connecting pipe 5 is connected to the joint body 1, and the air outlet end of the connecting pipe 5 is connected to the air inlet of the power component 3. The wind collection component 4 has a wind collection cavity, and the air suction port 41 and the air outlet are communicated with the wind collection cavity. When the air extraction device works, the power component 3 operates, and the air flow enters the wind collection component 4 from the air suction port 41 and then is discharged through the air outlet, and flows along the joint body 1 and the connecting pipe 5, and finally enters the power component 3 through the air outlet end of the connecting pipe, and then is discharged by the power component 3. During the process of the air extraction device sucking oil fume, when the oil fume flows along the joint body 1 and the connecting pipe, the mixture of oil and water in the oil fume will adhere to the inner wall of the joint body 1 and the inner wall surface of the connecting pipe, and then flow downward. The power component 3 has a turbine cavity. When the power component 3 works, the mixture of oil and water in the oil fume will be thrown to the inner wall of the turbine cavity. When the power component 3 stops operating, the mixture of oil and water will be discharged into the connecting pipe along the outlet of the turbine cavity, and then flow downward along the connecting pipe.
[0028] Among them, please refer to Figure 1 and Figure 2, the air outlet joint disclosed in the present application includes a joint body 1 and an oil baffle 2. The interior of the joint body 1 has an air outlet passage, and the inner side wall surface of the air outlet passage is provided with a first support portion 11 and a second support portion 12. Both ends of the oil baffle 2 are connected to the first support portion 11 and the second support portion 12 to be fixed within the air outlet passage. When the air outlet joint of the present utility model is applied to an exhaust device, the part of the downward projection of the air outlet passage that aligns with the air suction port 41 of the exhaust device is covered by the oil baffle 2. When the oil liquid in the connecting pipe drips downward through the air outlet passage, at the part that aligns with the oil baffle 2, the oil droplets are blocked by the oil baffle 2 and cannot drip through the air suction port 41, which can prevent the oil droplets in the connecting pipe from dripping onto the cooking range or cooking utensils through the air suction port 41.
[0029] In the air outlet joint of the present application, an oil baffle 2 is provided within the air outlet passage of the joint body 1. The oil baffle 2 is located above the air suction port 41 of the exhaust device, and the downward projection of the oil baffle 2 covers the air suction port 41. Therefore, when the oil droplets in the air outlet passage fall downward, the part of the air outlet passage that aligns with the air suction port 41 is blocked by the oil baffle 2, preventing the oil droplets from falling out through the air suction port 41. The hygienic performance of the exhaust device during use is improved.
[0030] Please refer to Figure 2 , in the air outlet joint of the present utility model, both ends of the oil baffle 2 are arcs adapted to the inner wall surface of the air outlet passage. After both ends of the oil baffle 2 are connected to the first support portion 11 and the second support portion 12, the corresponding sides are in contact with the inner wall surface of the air outlet passage. It can be understood that making both ends of the oil baffle 2 be arcs adapted to the inner wall surface of the air outlet passage is to better fit the oil baffle 2 with the inner wall of the air outlet passage and avoid large gaps that may cause oil droplets to drip onto the air suction port 41. In addition, as long as it is for the cooperation between the oil baffle 2 and the wall surface of the air outlet passage, other simple replacements of the two ends of the oil baffle 2 also fall within the protection scope of the present application.
[0031] Please refer to Figure 2, in the air outlet joint of the present utility model, positioning members 13 and connecting portions 14 are provided on both the first supporting portion 11 and the second supporting portion 12. Avoidance portions 21 are provided at both ends of the oil baffle 2. The avoidance portions 21 avoid the positioning members 13 and the connecting portions 14. The connecting member is connected to the connecting portion 14 and presses the corresponding side of the oil baffle 2 between the connecting member and the connecting portion 14 to fix the oil baffle 2 to the first supporting portion 11 and the second supporting portion 12. In the illustrated embodiment, the avoidance portion 21 is a through hole or a notch provided on the side edge of the oil baffle 2. The avoidance portion 21 is a notch, which is more convenient for the avoidance portion to be positioned by the positioning member 13. When installing the oil baffle 2 into the air outlet passage, after aligning the avoidance portion 21 on the oil baffle 2 with the positioning member 13, adjust the positions of both ends of the oil baffle 2 on the first supporting portion 11 and the second supporting portion 12, and the avoidance portion 21 can be aligned with the corresponding connecting portion 14. In the illustrated embodiment, the connecting portion 14 is a screw hole provided on the first supporting portion 11 and the second supporting portion 12. Screw the screw into the screw hole so that the nut of the screw presses the part of the oil baffle 2 outside the avoidance portion 21, and the oil baffle 2 can be fixed on the first supporting portion 11 and the second supporting portion 12.
[0032] Please refer to Figure 1 and Figure 3 , in the air outlet joint of the present utility model, a first oil guiding portion 22 extends backward from the rear side edge of the oil baffle 2. The width of the first oil guiding portion 22 in the left-right direction is smaller than the width of the corresponding position of the air outlet passage. After the oil baffle 2 is installed into the air outlet passage, an air passing gap is formed between both sides of the first oil guiding portion 22 and the air outlet passage. If the width of the oil baffle 2 in the front-rear direction is too large, it will block the entry of the oil fume in the air collecting cavity into the air outlet passage, resulting in too large air resistance in the air outlet passage and affecting the effect of the smoke extraction device for extracting oil fume. Therefore, the width of the part of the oil baffle 2 blocking the air suction port 41 only needs to be adapted to the air suction port 41. However, after the oil liquid dripping onto the oil baffle 21 accumulates to a certain amount, it will drip downward from the edge of the oil baffle 2. In order to prevent the oil liquid from splashing out from the air suction port 41, a first oil guiding portion 22 extends backward from the edge of the oil baffle 2. The first oil guiding portion 22 guides the oil liquid on the oil baffle 2 to one side of the air suction port 41, and the width of the first oil guiding portion 22 in the left-right direction is smaller than the width of the corresponding position of the air outlet passage. While guiding the oil, the air resistance formed by the first oil guiding portion 22 in the air outlet passage is reduced as much as possible. Therefore, an air passing gap is formed between both sides of the first oil guiding portion 22 and the air outlet passage to ensure the air intake effect.
[0033] Please refer to Figure 2, in the air outlet joint of the present utility model, a second oil guiding portion 23 extends from the rear side edge of the first oil guiding portion 22. The second oil guiding portion 23 is arranged to slope downward from front to back, and there is an air passing gap between the second oil guiding portion 23 and the air outlet passage. In order to reduce the influence of the first oil guiding portion 22 on the air resistance in the air outlet passage, the width of the first oil guiding portion 22 in the front-back direction needs to be as small as possible. At the same time, in order to prevent the oil droplets dripping from the baffle 2 from splashing out through the air suction port 41, a downward-sloping second oil guiding portion 23 is provided at the rear edge of the first oil guiding portion 22. The second oil guiding portion 23 guides the oil on the baffle 2 downward, and when the oil drops into the air collecting cavity, it drips onto the rear side of the air suction port 41. At the same time, there is an air passing gap between the second oil guiding portion 23 and the air outlet passage, which can reduce the air resistance formed by the second oil guiding portion 23 in the air outlet passage as much as possible.
[0034] That is to say, in the air outlet joint of the present utility model, the rear edge of the oil guiding plate 2 is successively provided with a first oil guiding portion 22 and a second oil guiding portion 23. The widths of the first oil guiding portion 22 and the second oil guiding portion in the left-right direction gradually decrease in turn. While guiding the oil on the baffle 2 downward, the air resistance formed by the oil guiding plate 2, the first oil guiding portion 22 and the second oil guiding portion 23 in the air outlet passage is reduced as much as possible.
[0035] Please refer to Figures 3 to 5 , the present utility model also proposes an air extraction device using the above air outlet joint. The air extraction device includes a power component 3, an air collecting component 4 and a connecting pipe 5. The air collecting component 4 is provided with an air suction port 41 and an air outlet. The joint body 1 is connected to the air outlet of the air collecting component 4. The downward projection of the baffle 2 covers the air suction port 41. The power component 3 has an air inlet and an air outlet. The air inlet end of the connecting pipe 5 is connected to the joint body 1, and the air outlet end of the connecting pipe 5 is connected to the air inlet of the power component 3. When the air extraction device works, the power component 3 operates, and the air flow is inhaled from the air suction port 41 of the air collecting component 4, then successively passes through the joint body 1 and the connecting pipe 5, and finally is discharged from the air outlet of the power component 3. Since the baffle 2 is provided in the joint body of the air outlet joint, when the oil in the power component 3 drips downward through the connecting pipe 5 and the air outlet passage of the joint body 1, the part of the air suction port 41 aligned with the baffle 2 is blocked by the baffle 2, and no oil will directly drip from the air suction port 41 to the outside of the air extraction device.
[0036] Please refer to Figure 1 and Figure 2, in the exhaust device of the present utility model, a first annular wall 1a extends upward from the outlet end of the air outlet channel of the joint body 1. A second annular wall 1b is arranged around the first annular wall 1a and a third annular wall 1c is arranged around the second annular wall 1b, both of which extend upward from the upper surface of the joint body 1. A first oil guiding groove 15 is formed between the first annular wall 1a and the second annular wall 1b, and a second oil guiding groove 16 is formed between the second annular wall 1b and the third annular wall 1c. The second oil guiding groove 16 communicates with the first oil guiding groove 15, and the first oil guiding groove 15 communicates with the wall surface of the air outlet channel. The connecting pipe 5 is connected between the second annular wall 1b and the third annular wall 1c. When the connecting pipe 5 is connected between the first annular wall 1a and the second annular wall 1b, after the exhaust device completes the operation of sucking oil fume, the oil liquid generated in the power assembly 3 flows downward along the connecting pipe 5. The oil liquid flowing downward along the wall surface of the connecting pipe 5 enters the second oil guiding groove 16, then enters the first oil guiding groove 15 through the second oil guiding groove 16, and then flows out through the first oil guiding groove 15 and flows along the inner wall surface of the air outlet channel, and finally drips into the air collecting cavity of the air collecting assembly 4 through the lower edge of the air outlet channel, and is finally led out through the oil guiding hole on the bottom plate of the air collecting cavity 4 and received by the oil cup connected to the air collecting assembly 4.
[0037] Please refer to Figure 1 and Figure 2 , in the exhaust device of the present utility model, the first oil guiding groove 15 has an oil outlet, and two sides of the oil outlet extend downward along the inner side wall surface of the air outlet channel to form first diversion grooves 17. After the oil liquid in the second oil guiding groove 16 enters the first oil guiding groove 15, it flows along the first oil guiding groove 15 and converges towards the oil outlet of the first oil guiding groove 15, and then flows into the first diversion grooves 17 through the oil outlet of the first oil guiding groove 15. The first diversion grooves 17 can concentrate the oil liquid and direct it to one side of the air collecting cavity. In practical applications, an oil guiding hole is provided on the bottom plate of the air collecting assembly 4. After the first diversion grooves 17 concentrate the oil liquid and direct it to the bottom plate of the air collecting assembly 4, the oil guiding hole discharges the oil liquid. In practical applications, the projection of the first diversion grooves 17 on the bottom of the air collecting cavity is located behind the air suction port 41, and the oil guiding hole is located behind the air suction port 41. The first diversion grooves 17 concentrate the oil liquid and direct it to the rear side of the air outlet 41, and then the oil guiding hole discharges the oil liquid.
[0038] Please refer to Figure 1 and Figure 2 , in the exhaust device of the present utility model, the wall surface of the air outlet channel between the outlets of the first oil guiding groove 15 forms an oil guiding surface, and the downward projection of the oil guiding surface is located behind the air suction port 41. The first diversion grooves 17 are located on both sides of the outlet of the first oil guiding groove 15. In practical applications, the projection of the first diversion grooves 17 on the bottom of the air collecting cavity is located behind the air suction port 41. Therefore, the downward projection of the oil guiding surface is located behind the air suction port, so that when the oil liquid flows downward along the wall surface of the air outlet channel, it all concentrates and flows to the rear side of the air outlet.
[0039] Please refer to Figure 1 and Figure 2, in the air extraction device of the present utility model, an oil outlet hole 18 is provided at a portion of the second annular wall 1b corresponding to the outlet of the first oil guide groove 15. The oil outlet hole 18 communicates the second oil guide groove 16 with the oil guide surface, and a second diversion groove 19 is provided at a portion of the oil guide surface corresponding to the oil outlet hole 18. A part of the oil liquid in the second oil guide groove 16 enters the first oil guide groove 15 through the connection portion between the second oil guide groove 16 and the bottom oil guide groove 15, and then is discharged through the first diversion groove 17. Another part enters the second diversion groove 19 through the oil outlet hole 18, flows out along the second diversion groove 19, and finally drips onto the portion of the bottom plate of the air collecting cavity located behind the air suction port 41 along the lower edge of the diversion surface.
[0040] In practical applications, the connection portion between the second oil guide groove 16 and the first oil guide groove 15 is a through hole provided on the second annular wall 1b. The height of the through hole is lower than the depth of the second oil guide groove 16, and the oil liquid in the second oil guide groove 16 can smoothly enter the first oil guide groove 15 through the through hole.
[0041] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. An air outlet joint for an air extraction device, characterized in that, Comprising: A joint body (1) having an air outlet channel inside, and a first support portion (11) and a second support portion (12) are provided on the inner side wall surface of the air outlet channel; An oil baffle (2) whose two ends are connected to the first support portion (11) and the second support portion (12), and the downward projection of the oil baffle (2) covers the air suction port of the air extraction device.
2. The air outlet joint according to claim 1, wherein The two ends of the oil baffle (2) are arcs adapted to the inner wall surface of the air outlet channel. After the two ends of the oil baffle (2) are connected to the first support portion (11) and the second support portion (12), the corresponding sides are in contact with the inner wall surface of the air outlet channel.
3. The air outlet joint according to claim 1, wherein, Positioning members (13) and connecting portions (14) are provided on both the first support portion (11) and the second support portion (12). Avoidance portions (21) are provided at the two ends of the oil baffle (2). The avoidance portions (21) avoid the positioning members (13) and the connecting portions (14). A connecting member is connected to the connecting portion (14) and presses the corresponding side of the oil baffle (2) between the connecting member and the connecting portion (14) to fix the oil baffle (2) to the first support portion (11) and the second support portion (12).
4. The air outlet joint according to claim 1, characterized in that A first oil guiding portion (22) extends backward from the rear side edge of the oil baffle (2). The width of the first oil guiding portion (22) in the left-right direction is smaller than the width of the corresponding position of the air outlet channel. After the oil baffle (2) is installed in the air outlet channel, an air passing gap is formed between the two sides of the first oil guiding portion (22) and the air outlet channel.
5. The air outlet joint according to claim 4, characterized in that, A second oil guiding portion (23) extends from the rear side edge of the first oil guiding portion (22). The second oil guiding portion (23) is inclined downward from front to back. There is an air passing gap between the second oil guiding portion (23) and the air outlet channel.
6. An air extraction device, which uses the air outlet joint described in any one of claims 1 to 5, is characterized in that Comprising a power assembly (3), a wind collecting assembly (4) and a connecting pipe (5). An air suction port (41) and an air outlet are provided on the wind collecting assembly (4). The joint body (1) is connected to the air outlet. The downward projection of the oil baffle (2) covers the air suction port (41). The power assembly (3) has an air inlet and an air outlet. The air inlet end of the connecting pipe (5) is connected to the joint body (1), and the air outlet end of the connecting pipe (5) is connected to the air inlet of the power assembly (3).
7. The exhaust device according to claim 6, characterized in that A first annular wall (1a) extends upward from the outlet end of the air outlet channel of the joint body (1). A second annular wall (1b) surrounding the first annular wall (1a) and a third annular wall (1c) surrounding the second annular wall (1b) extend upward from the upper surface of the joint body (1). A first oil guiding groove (15) is formed between the first annular wall (1a) and the second annular wall (1b). A second oil guiding groove (16) is formed between the second annular wall (1b) and the third annular wall (1c). The second oil guiding groove (16) is communicated with the first oil guiding groove (15). The first oil guiding groove (15) is communicated with the wall surface of the air outlet channel. The connecting pipe (5) is connected between the second annular wall (1b) and the third annular wall (1c).
8. The exhaust device according to claim 7, wherein The first oil guide groove (15) has an oil outlet, and on both sides of the oil outlet, first diversion grooves (17) extend downward along the inner side wall of the air outlet passage.
9. The exhaust device according to claim 8, characterized in that, The wall surface of the air outlet passage between the outlets of the first oil guide groove (15) forms an oil guide surface, and the downward projection of the oil guide surface is located behind the air suction port (41).
10. The exhaust device according to claim 9, wherein An oil outlet hole (18) is provided at a portion of the second annular wall (1b) corresponding to the outlet of the first oil guide groove (15). The oil outlet hole (18) connects the second oil guide groove (16) with the oil guide surface, and a second diversion groove (19) is provided at a portion of the oil guide surface corresponding to the oil outlet hole (18).