Air outlet connector

Abstract

The utility model relates to the technical field of connectors, in particular to an air outlet connector. The smoke pipe connector is connected to an air outlet of an air collecting box assembly and used for being connected with a smoke pipe and comprises a connector body, the connector body is provided with an air outlet channel, the upper edge of the air outlet channel extends upwards to form a first annular wall located on the upper surface of the connector body, and the upper surface of the connector body is further provided with a second annular wall located on the outer side of the first annular wall. A first oil guide groove is formed between the first ring wall and the second ring wall and communicates with the air outlet channel, and oil in the first oil guide groove flows downwards along the inner wall face of the air outlet channel. The utility model aims to solve the problems that oil in a smoke pipe flows to an air collection box assembly along the inner wall of the smoke pipe, an existing air outlet joint is difficult to guide the oil in the smoke pipe, the oil is difficult to smoothly flow downwards along the inner pipe wall of the smoke pipe when a user uses the smoke exhaust ventilator for a long time, and oil is easily collected in a pipeline of the smoke pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of connection joints, and particularly relates to an air outlet joint. Background Art

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. It is usually installed above the kitchen stove. Its main function is to quickly extract and discharge the waste generated by the stove combustion and the harmful cooking fumes to the outside, and at the same time condense and collect the cooking fumes to reduce the harm to the kitchen environment and human health.

[0003] At present, the range hood mainly includes an air collecting box assembly, an exhaust system, a control system, an oil fume collection system, etc. Among them, the air outlet of the air collecting box assembly is connected to the smoke pipe through an air outlet joint. The air outlet of the air collecting box assembly is vertically opened. The existing air outlet joint is difficult to guide the oil liquid in the smoke pipe, so that during the long-term use of the range hood by the user, the oil liquid is difficult to flow smoothly downward along the inner wall of the smoke pipe, resulting in easy oil collection in the pipeline of the smoke pipe, and the cooking fumes are likely to be blocked after entering the smoke pipe, thus affecting the service life of the range hood. Summary of the Utility Model

[0004] An air outlet joint provided by the utility model is used to solve the problem that the existing air outlet joint is difficult to guide the oil liquid in the smoke pipe, so that during the long-term use of the range hood by the user, the oil liquid is difficult to flow smoothly downward along the inner wall of the smoke pipe, resulting in easy oil collection in the pipeline of the smoke pipe.

[0005] To achieve the above object, the utility model adopts the following technical scheme: An air outlet joint is connected to the air outlet of the air collecting box assembly and is used to be connected to the smoke pipe. It includes a joint body. The joint body has an air outlet channel. The upper edge of the air outlet channel extends upward to form a first annular wall on the upper surface of the joint body. The upper surface of the joint body is also provided with a second annular wall outside the first annular wall. A first oil guiding groove is formed between the first annular wall and the second annular wall. The first oil guiding groove is communicated with the air outlet channel. The oil liquid in the first oil guiding groove flows downward along the inner wall surface of the air outlet channel.

[0006] According to an embodiment of the utility model, the air outlet channel includes an upper air duct surrounded by the first annular wall and a lower air duct located below the upper air duct. The inner wall surface of the lower air duct is an arc surface. The inner diameter of the lower air duct gradually decreases from bottom to top, so that the upper edge of the lower air duct forms a step surface at the lower end of the upper air duct. The step surface is an oil guiding surface sunken into the air outlet channel. The oil guiding surface is used to receive the oil liquid flowing down from the upper air duct. The oil guiding surface is communicated with the lower air duct.

[0007] According to an embodiment of the present utility model, the oil guiding surface has a notch, a liquid guiding surface is provided on the lower air duct, the upper edge of the liquid guiding surface is connected to the notch, the liquid guiding surface is inclined and the lower edge extends to the lower edge of the lower air duct.

[0008] According to an embodiment of the present utility model, the liquid guiding surfaces are provided on both sides of the notch, the inner wall surface of the upper air duct extends downward to the part between the two liquid guiding surfaces and forms a liquid guiding surface, and the oil liquid on the inner wall surface of the part of the upper air duct corresponding to the notch flows to the liquid guiding surface through the notch.

[0009] According to an embodiment of the present utility model, a first liquid guiding port is provided on the wall surface of the part of the first annular wall corresponding to the notch, and the oil liquid in the first oil guiding groove flows out through the first liquid guiding port and flows downward along the liquid guiding surface.

[0010] According to an embodiment of the present utility model, a second liquid guiding port is provided on the first annular wall, and the oil liquid in the first oil guiding groove enters the oil guiding surface through the first liquid guiding port, and then enters the liquid guiding surface along the notch.

[0011] According to an embodiment of the present utility model, a third annular wall extends upward from the upper edge of the lower air duct, the first annular wall, the oil guiding surface and the third annular wall enclose a second oil guiding groove, and the third annular wall extends along the outer edge of the liquid guiding surface at the notch of the oil guiding surface.

[0012] According to an embodiment of the present utility model, the lower end of the inner wall surface of the third annular wall has a connecting surface that is connected and tangent to the upper end of the inner wall surface of the lower air duct, and the connecting surface is an arc surface protruding toward the upper air duct.

[0013] According to an embodiment of the present utility model, a sealing groove is provided on the lower surface of the joint body, and a part between the inner side wall surface of the sealing groove and the inner side wall of the part of the air outlet channel located on the lower surface of the joint body forms a fourth annular wall.

[0014] According to an embodiment of the present utility model, a clamping groove is provided on the second annular wall, and a clamping block is provided on the inner wall surface of the second annular wall.

[0015] Compared with the prior art, an air outlet joint of the present utility model has the following advantages:

[0016] An air outlet joint of the present utility model, through the settings of a joint body with an air outlet channel, a first annular wall, a second annular wall, and a first oil guiding groove, when both ends of the air outlet joint are respectively installed at the air outlet of the air collecting box and connected to the smoke pipe, when a user uses a range hood with the air outlet joint, the oil liquid remaining on the inner wall of the smoke pipe flows into the first oil guiding groove between the first annular wall and the second annular wall, the oil liquid in the first oil guiding groove is collected, and then the oil liquid in the first oil guiding groove flows downward along the inner wall surface of the air outlet channel, so as to realize guiding the oil liquid remaining on the inner wall of the smoke pipe, and realize that the air outlet joint guides the oil liquid to smoothly flow out from the bottom of the pipeline, avoid oil accumulation in the pipeline, and realize that the smoke pipe can discharge oil fume smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present utility model, the drawings required for use in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts do not necessarily draw according to the actual proportion.

[0018] Figure 1 FIG. 9 is a schematic diagram of the overall structure of an air outlet joint of the present utility model.

[0019] Figure 2 FIG. 13 is a top view of an air outlet joint of the present utility model.

[0020] Figure 3 FIG. 17 is a cross-sectional view of an air outlet joint of the present utility model.

[0021] Figure 4 FIG. 21 is a schematic diagram of the overall structure of an air outlet joint of the present utility model assembled in an air collecting box assembly and a smoke pipe.

[0022] Figure 5 FIG. 25 is a cross-sectional view of an air outlet joint of the present utility model assembled in an air collecting box assembly and a smoke pipe.

[0023] Reference numerals:

[0024] Joint body 1, air outlet channel 11, upper air duct 111, liquid guiding surface 1111, lower air duct 112, oil guiding surface 1121, liquid guiding surface 1122, first annular wall 12, first liquid guiding port 121, second liquid guiding port 122, second annular wall 13, clamping groove 131, clamping block 132, first oil guiding groove 14, third annular wall 15, connecting surface 151, second oil guiding groove 16, sealing groove 17, air collecting box assembly 2, smoke pipe 3. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will disclose multiple embodiments of the present utility model with diagrams. For the sake of clear illustration, many practical details will be described together in the following narrative. 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 diagrams, some conventional structures and components will be illustrated in a simple schematic manner in the diagrams.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indication will also change accordingly.

[0027] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes, not specifically referring to the order or sequence, nor are they used to limit the present utility model. They are merely 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.

[0028] To further understand the content, features, and effects of the present utility model, the following embodiments are exemplified and described in detail with reference to the attached drawings as follows:

[0029] Please refer to Figures 1 to 5 , the present utility model provides an air outlet joint, which is connected to the air outlet of the air collecting box assembly 2 and is used to connect with the smoke pipe 3. It includes a joint body 1. The joint body 1 has an air outlet passage 11. The upper edge of the air outlet passage 11 extends upward to form a first ring wall 12 on the upper surface of the joint body 1. The upper surface of the joint body 1 is also provided with a second ring wall 13 outside the first ring wall 12. A first oil guiding groove 14 is formed between the first ring wall 12 and the second ring wall 13. The first oil guiding groove 14 is communicated with the air outlet passage 11, and the oil liquid in the first oil guiding groove 14 flows downward along the inner wall surface of the air outlet passage 11.

[0030] An air outlet joint of the present utility model. When the two ends of the air outlet joint are respectively installed at the air outlet of the air collecting box and connected to the smoke pipe 3, when the user uses a range hood with the air outlet joint, the oil liquid remaining on the inner wall of the smoke pipe 3 flows into the first oil guiding groove 14 between the first annular wall 12 and the second annular wall 13. The first oil guiding groove 14 catches the oil liquid flowing down from various positions on the inner wall of the smoke pipe. The first oil guiding groove 14 collects the oil liquid, so that the oil liquid remaining on the inner wall of the smoke pipe 3 accumulates in the first oil guiding groove 14. The oil liquid in the first oil guiding groove 14 flows downward along the inner wall surface of the air outlet passage 11, thereby realizing the guiding of the oil liquid remaining on the inner wall of the smoke pipe 3. The air outlet joint guides the oil liquid to flow smoothly downward, and the oil liquid flows out smoothly from the bottom of the pipe, avoiding oil collection in the pipe and realizing that the oil fume can be discharged smoothly from the smoke pipe.

[0031] On the basis of the above embodiments, please also refer to Figure 1 and Figure 2 , in some other embodiments, the air outlet passage 11 includes an upper air duct 111 surrounded by the first annular wall 12 and a lower air duct 112 located below the upper air duct 111. The inner wall surface of the lower air duct 112 is an arc surface, and the inner diameter of the lower air duct 112 gradually decreases from bottom to top, so that the upper edge of the lower air duct 112 forms a step surface at the lower end of the upper air duct 111. The step surface is an oil guiding surface 1121 that is concave into the air outlet passage 11. The oil guiding surface 1121 is used to receive the oil liquid flowing down from the upper air duct 111, and the oil guiding surface 1121 is communicated with the lower air duct 112. By setting the air outlet passage 11 as the upper air duct 111 and the lower air duct 112 with an arc-shaped inner wall surface; at the same time, the upper edge of the lower air duct 112 with an inner diameter gradually decreasing from bottom to top forms a step surface as the oil guiding surface 1121 at the lower end of the upper air duct 111. When the user uses a range hood with an air outlet joint of the present utility model, the oil liquid remaining on the inner wall of the smoke pipe 3 flows into the first oil guiding groove 14 between the first annular wall 12 and the second annular wall 13. The first oil guiding groove 14 catches the oil liquid remaining on the inner wall of the smoke pipe 3, and the first oil guiding groove 14 collects the oil liquid. The oil liquid in the first oil guiding groove 14 flows into the oil guiding surface 1121 after passing through the upper air duct 111, and then the oil guiding surface 1121 guides the oil liquid, so as to better catch the oil liquid in the smoke pipe, guide the oil liquid to flow smoothly downward, avoid oil collection in the pipe, and realize that the smoke pipe can discharge the oil fume smoothly. At the same time, the inner diameter of the air outlet passage 11 gradually decreases from bottom to top, thereby increasing the flow velocity of the air outlet and facilitating the oil fume to enter the smoke pipe 3 faster.

[0032] On the basis of the above embodiments, please also refer to Figures 1 to 3, in some other embodiments, the oil guiding surface 1121 has a notch, and a liquid guiding surface 1122 is provided on the lower air duct 112. The upper edge of the liquid guiding surface 1122 is connected to the notch. The liquid guiding surface 1122 is inclined and its lower edge extends to the lower edge of the lower air duct 112. When the user uses the range hood, the oil liquid left on the inner wall of the smoke pipe 3 flows into the first oil guiding groove 14 between the first annular wall 12 and the second annular wall 13, and the oil liquid is collected through the first oil guiding groove 14. The oil liquid in the first oil guiding groove 14 flows into the oil guiding surface 1121 through the upper air duct 111, and then the oil liquid flows to the liquid guiding surface 1122 through the notch of the oil guiding surface 1121. The liquid guiding surface 1122 which is inclined and whose lower edge extends to the lower edge of the lower air duct 112 guides the oil liquid. When the user uses the range hood for ventilation, the oil liquid flowing down from various positions on the inner wall of the smoke pipe is received by the first oil guiding groove 14, avoiding the formation of oil accumulation at various positions on the inner wall of the smoke pipe. Through the notch of the oil guiding surface 1121 and the setting of the liquid guiding surface 1122 on the lower air duct 112, the oil liquid can be better guided to flow downward, so that the oil fume can smoothly discharge from the smoke pipe.

[0033] Based on the above embodiments, please refer to Figures 1 to 3 , in some other embodiments, liquid guiding surfaces 1122 are provided on both sides of the notch. The inner wall surface of the upper air duct 111 extends downward to the part between the two liquid guiding surfaces 1122 and forms a liquid guiding surface 1111. The oil liquid on the inner wall surface of the part of the upper air duct 111 corresponding to the notch flows to the liquid guiding surface 1111 through the notch. When the user uses the range hood, the oil liquid left on the inner wall of the smoke pipe 3 flows into the first oil guiding groove 14 between the first annular wall 12 and the second annular wall 13 through the first oil guiding groove 14 to collect the oil liquid; at the same time, the oil liquid in the first oil guiding groove 14 flows into the oil guiding surface 1121 through the upper air duct 111, and then the oil liquid flows to the liquid guiding surfaces 1122 on both sides of the notch through the notch of the oil guiding surface 1121, so that the oil liquid on the inner wall surface of the part of the upper air duct 111 corresponding to the notch flows to the liquid guiding surface 1111. When the user uses the range hood and the oil fume is relatively strong, the oil liquid is guided by the liquid guiding surfaces 1122 and the liquid guiding surface 1111. Not only can the oil liquid flowing down from various positions on the inner wall of the smoke pipe be received by the first oil guiding groove 14, but also it can be ensured that the oil liquid will be guided away at the air outlet of the air collecting box assembly 2, so that the oil liquid is guided, the oil liquid can flow downward better, avoiding the formation of oil accumulation at various positions on the inner wall of the smoke pipe, and the oil fume can discharge more smoothly from the smoke pipe.

[0034] Based on the above embodiments, please refer to Figures 1 to 3, in some other embodiments, a first liquid guide port 121 is provided on the wall surface of the part of the first annular wall 12 corresponding to the notch. The oil liquid in the first oil guide groove 14 flows out through the first liquid guide port 121 and flows downward along the liquid guide surface 1111. Through the arrangement of the first liquid guide port 121, when the user uses the range hood, the oil liquid left on the inner wall of the smoke pipe 3 flows into the first oil guide groove 14 between the first annular wall 12 and the second annular wall 13. After the oil liquid in the first oil guide groove 14 is collected, it flows out through the first liquid guide port 121. Then the oil liquid flows into the oil guide surface 1121 through the upper air duct 111, and then flows to the liquid guide surfaces 1122 on both sides of the notch through the notch of the oil guide surface 1121, so that the oil liquid on the inner wall surface of the part of the upper air duct 111 corresponding to the notch flows to the liquid guide surface 1111 through the notch. Thus, the oil liquid is guided by the liquid guide surfaces 1122 and 1111, so that the oil liquid can be better collected. At the same time, when the user stops ventilation, the oil liquid collected in the first oil guide groove 14 can also flow out through the first liquid guide port 121, so as to guide the oil liquid to flow downward smoothly, make the oil liquid flow downward more quickly, realize the export of the oil liquid from the air outlet of the air collecting box assembly 2, prevent the oil liquid from forming oil accumulation in the pipeline of the smoke pipe, and realize the smoothness of the smoke pipe.

[0035] Based on the above embodiments, please refer to Figure 1 and Figure 2 , in some other embodiments, a second liquid guide port 122 is provided on the first annular wall 12. The oil liquid in the first oil guide groove 14 enters the oil guide surface 1121 through the first liquid guide port 121 and then enters the liquid guide surface 1122 along the notch. Through the arrangement of the second liquid guide port 122, when the user uses the range hood, the oil liquid left on the inner wall of the smoke pipe 3 flows into the first oil guide groove 14 between the first annular wall 12 and the second annular wall 13. The collected oil liquid in the first oil guide groove 14 can flow out through the first liquid guide port 121 and the second liquid guide port 122, so as to increase the outflow speed of the oil liquid in the first oil guide groove 14. Then the oil liquid flows into the oil guide surface 1121 through the upper air duct 111, and then flows to the liquid guide surfaces 1122 on both sides of the notch through the notch of the oil guide surface 1121, so that the oil liquid on the inner wall surface of the part of the upper air duct 111 corresponding to the notch flows to the liquid guide surface 1111 through the notch. Thus, the oil liquid is guided by the liquid guide surfaces 1122 and 1111. At the same time, in the case of strong oil fume, the oil liquid collected in the first oil guide groove 14 can also flow out more quickly through the first liquid guide port 121 and the second liquid guide port 122, so as to guide the oil liquid to flow downward smoothly. Through the first liquid guide port 121 and the second liquid guide port 122, the oil liquid can be guided to flow downward smoothly more quickly, make the oil liquid flow downward more quickly, realize the export of the oil liquid from the air outlet of the air collecting box assembly 2, and realize that the oil fume can be discharged more smoothly through the smoke pipe.

[0036] Based on the above embodiments, please refer toFigure 1 , Figure 2 and Figure 3 , in some other embodiments, a third annular wall 15 extends upward from the upper edge of the lower air duct 112. The first annular wall 12, the oil guiding surface 1121 and the third annular wall 15 enclose a second oil guiding groove 16. The third annular wall 15 extends along the outer edge of the liquid guiding surface 1122 at the notch of the oil guiding surface 1121. When the user uses the range hood, the oil left on the inner wall of the smoke pipe 3 can not only flow into the first oil guiding groove 14 between the first annular wall 12 and the second annular wall 13. The oil in the first oil guiding groove 14 converges and flows out through the first liquid guiding port 121. The oil then flows through the upper air duct 111 and into the oil guiding surface 1121. The oil then flows through the notch of the oil guiding surface 1121 and flows to the liquid guiding surfaces 1122 on both sides of the notch. Moreover, the second oil guiding groove 16 catches the oil flowing down or dripping from the inner wall of the smoke pipe 3. The oil is collected through the second oil guiding groove 16. The third annular wall 15 extending along the outer edge of the liquid guiding surface 1122 at the notch of the oil guiding surface 1121 limits the oil, so that the oil in the second oil guiding groove 16 flows out along the liquid guiding surface 1122. Thus, the first oil guiding groove 14 and the second oil guiding groove 16 jointly guide the oil, so that the oil on the inner wall surface of the part of the upper air duct 111 corresponding to the notch flows to the liquid guiding surface 1111 through the notch. Thus, the oil is guided and collected through the liquid guiding surface 1122 and the liquid guiding surface 1111. At the same time, through the joint setting of the first oil guiding groove 14 and the second oil guiding groove 16, when the user uses the range hood or stops the range hood from ventilating, not only the first oil guiding groove 14 and the second oil guiding groove 16 guide the oil respectively, but also can more quickly guide the oil to flow smoothly downward, so that the oil can flow downward more quickly, realizing the export of the oil from the air outlet of the air collecting box assembly 2, and realizing that the oil fume can be discharged more smoothly through the smoke pipe. Moreover, the first oil guiding groove 14 and the second oil guiding groove 16 can better catch the oil dripping from the smoke pipe, avoid the oil from dripping out of the air inlet of the air collecting box assembly 2, reduce the oil from dripping on the stove top, and thus improve the user experience.

[0037] On the basis of the above embodiments, please refer to Figure 1 , Figure 2 and Figure 3 , in some other embodiments, the lower end of the inner wall surface of the third annular wall 15 has a connecting surface 151 that is connected and tangent to the upper end of the inner wall surface of the lower air duct 112. The connecting surface 151 is an arc surface protruding upward into the upper air duct 111. By setting the arc surface protruding upward into the upper air duct 111 as the connecting surface 151, the connecting surface 151 increases the height of the second oil guiding groove 16, so as to facilitate the second oil guiding groove 16 to better receive the oil flowing down from the inner wall of the smoke pipe 3. When the user uses it, the connecting surface 151 guides the oil, so that the oil can be better collected and prevented from entering the internal gaps of the air collecting box assembly 2.

[0038] Based on the above embodiments, please also refer to Figure 1 、 Figure 2 and Figure 3 . In some other embodiments, a sealing groove 17 is provided on the lower surface of the joint body 1. A part between the inner side wall surface of the sealing groove 17 and the inner side wall of the part of the air outlet passage 11 located on the lower surface of the joint body 1 forms a fourth annular wall. Through the arrangement of the sealing groove 17 and the fourth annular wall, the fourth annular wall shields the oil liquid in the sealing groove 17. When the user is using, the oil liquid flowing down from the inner wall of the smoke pipe 3 is guided and collected by the liquid guiding surface 1122 and the guiding liquid surface 1111 and then flows to the fourth annular wall, and then the oil liquid is guided to flow out of the air outlet passage 11, so that the oil liquid can be better collected.

[0039] Based on the above embodiments, please also refer to Figure 1 、 Figure 4 and Figure 5 . In some other embodiments, a clamping groove 131 is provided on the second annular wall 13, and a clamping block 132 is provided on the inner wall surface of the second annular wall 13. In this embodiment, the clamping groove 131 is in a "7" shape. Through the arrangement of the clamping groove 131 and the clamping block 132, it is convenient for the user to better clamp the air outlet joint on the smoke pipe 3 during installation. At the same time, mounting holes are provided on the mounting surface at the bottom of the air outlet joint, and fixing members such as fixing screws or fixing bolts are fixed at the air outlet of the air collecting box assembly 2 through the mounting holes, so as to quickly mount the air outlet joint on the air collecting box assembly 2.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. An air outlet connector, connected to the air outlet of the air collecting box assembly, used to connect to the smoke pipe, characterized in that: The joint body (1) comprises a joint body (1), the joint body (1) having an air outlet channel (11), the upper edge of the air outlet channel (11) extending upward to form a first annular wall (12) located on the upper surface of the joint body (1), the upper surface of the joint body (1) also being provided with a second annular wall (13) located outside the first annular wall (12), a first oil guide groove (14) being formed between the first annular wall (12) and the second annular wall (13), the first oil guide groove (14) being connected to the air outlet channel (11), the oil in the first oil guide groove (14) flowing downward along the inner wall surface of the air outlet channel (11), and a second liquid guide port (122) being provided on the first annular wall (12).

2. The air outlet connector according to claim 1, characterized in that: The air outlet channel (11) comprises an upper air channel (111) surrounded by the first annular wall (12) and a lower air channel (112) located below the upper air channel (111); the inner wall surface of the lower air channel (112) is an arc surface; the inner diameter of the lower air channel (112) gradually decreases from bottom to top, so that the upper edge of the lower air channel (112) forms a step surface at the lower end of the upper air channel (111); the step surface is an oil guide surface (1121) recessed into the air outlet channel (11); the oil guide surface (1121) is used to receive oil flowing down from the upper air channel (111); and the oil guide surface (1121) is connected to the lower air channel (112).

3. The air outlet connector according to claim 2, characterized in that: The oil guiding surface (1121) has a notch, and the lower air duct (112) is provided with a liquid guiding surface (1122), the upper edge of the liquid guiding surface (1122) is connected to the notch, and the liquid guiding surface (1122) is inclined and the lower edge extends to the lower edge of the lower air duct (112).

4. The air outlet connector according to claim 3, characterized in that: The liquid guiding surfaces (1122) are provided on both sides of the notch, and the inner wall surface of the upper air channel (111) extends downward to the portion between the two liquid guiding surfaces (1122) to form a liquid guiding surface (1111), and the oil on the inner wall surface of the portion of the upper air channel (111) corresponding to the notch flows to the liquid guiding surface (1111) through the notch.

5. The air outlet connector according to claim 4, characterized in that: A first liquid guide port (121) is provided on the wall surface of the portion of the first annular wall (12) corresponding to the notch, and the oil in the first oil guide groove (14) flows out through the first liquid guide port (121) and flows downward along the liquid guide surface (1111).

6. The air outlet connector according to claim 4, characterized in that: The oil in the first oil guide groove (14) enters the oil guide surface (1121) through the first oil guide port (121), and then enters the liquid guide surface (1122) along the notch.

7. The air outlet connector according to claim 3, characterized in that: A third annular wall (15) extends upward from the upper edge of the lower air duct (112); the first annular wall (12), the oil guiding surface (1121) and the third annular wall (15) form a second oil guiding groove (16); the third annular wall (15) extends along the outer edge of the liquid guiding surface (1122) at the notch of the oil guiding surface (1121).

8. The air outlet connector according to claim 7, characterized in that: The lower end of the inner wall surface of the third annular wall (15) has a connection surface (151) that is connected to and tangent to the upper end of the inner wall surface of the lower air duct (112); the connection surface (151) is an arc surface that protrudes toward the upper air duct (111).

9. The air outlet connector according to claim 1, characterized in that: The lower surface of the joint body (1) is provided with a sealing groove (17), and the portion between the inner wall surface of the sealing groove (17) and the inner wall of the portion of the air outlet channel (11) located on the lower surface of the joint body (1) forms a fourth annular wall.

10. The air outlet connector according to claim 1, characterized in that: A clamping groove (131) is provided on the second annular wall (13), and a clamping block (132) is provided on the inner wall surface of the second annular wall (13).

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