A push-button type automobile air conditioner air outlet

Abstract

The application relates to the technical field of automobile air conditioning systems, in particular to a button type automobile air conditioner air outlet, which comprises an air outlet assembly, an air outlet channel is formed on the air outlet assembly, a baffle is located in the air outlet channel and rotationally connected with the air outlet assembly, a posture control assembly is installed on the air outlet assembly, the position control assembly is connected with the baffle, a control button is slidably connected with the air outlet assembly, the control button is connected with the posture control assembly, the control button is slid to switch the baffle between an opening position and a closing position through the posture control assembly, and the baffle blocks the air outlet channel when the baffle is in the closing position. The application has the effect of enabling the automobile air outlet to be opened and closed and quickly restored to the state before being closed, so that the use experience of the driver and the passenger is improved.

Description

Technical Field

[0001] This application relates to the field of automotive air conditioning system technology, and in particular to a button-type automotive air conditioning vent. Background Technology

[0002] Automobiles are a widely used means of transportation, and they are usually equipped with an air conditioning system to control the temperature inside the car or to ventilate and purify the air inside the car to improve the comfort of passengers. The car air conditioning system mainly includes a compressor, condenser, blower, gas delivery pipes and air outlets. By adjusting the opening and closing of the air outlets, parameters such as the direction and size of the airflow can be changed.

[0003] The prior art discloses a detachable car air vent knob and air conditioning vent, which includes a knob, a base and a fork. The knob has a receiving cavity, and the two side walls of the knob have connecting grooves that engage with the transverse blades. The middle of the two end faces of the knob extends outward to form connecting wings. The two end faces of the knob connected to the connecting wings have slots, and the connecting wings have slots. The connecting wings have slots, and the transverse blades have sliding grooves. The two sides of the end face of the base extend outward to form connecting blocks. The end face of the connecting blocks has slots that fit with the slots. The end face of the base between the two connecting blocks has a slot that fits with the slots. The end face of the base has a lever that fits with the slots. The end face of the base has a lever that is inserted into the sliding groove.

[0004] Regarding the aforementioned technologies, the method of continuously pushing a knob to move the blades to adjust the air outlet angle and air volume, and control the opening and closing of the air outlet, while simple in structure, requires continuous pushing and turning by the driver and passengers, resulting in low operational efficiency. Moreover, after the car's air conditioning vents are reopened, they cannot quickly return to the state before they were closed, and further adjustment of the blades is still required to achieve the airflow direction and volume before the car's air conditioning vents were closed, leading to a poor user experience in actual use. Utility Model Content

[0005] In order to improve the user experience of drivers and passengers by quickly restoring the car air vent to its previous state while opening and closing the vent, this application provides a button-type car air conditioning vent.

[0006] The technical solution for a button-type automotive air conditioning vent provided in this application is as follows:

[0007] A push-button car air conditioning vent, comprising:

[0008] An air outlet assembly, wherein an air outlet channel is formed on the air outlet assembly;

[0009] A baffle, which is located in the air outlet channel and is rotatably connected to the air outlet assembly;

[0010] An attitude control assembly is mounted on the air outlet assembly, and the position control assembly is connected to the baffle.

[0011] The control button is slidably connected to the air outlet assembly and is also connected to the attitude control assembly. When the control button is slid, the attitude control assembly switches the baffle between an open position and a closed position. When the baffle is in the closed position, it blocks the air outlet channel.

[0012] By adopting the above technical solution, when it is necessary to block the air outlet duct, force is applied to the control button, causing the control button to slide relative to the air outlet assembly. During the sliding process, force is applied to the attitude control assembly, which in turn applies force to the baffle, causing the baffle to switch from the open position to the closed position, thus blocking the air outlet duct. When it is necessary to open the air outlet duct, the control button is pressed again, and the attitude control assembly applies force to the baffle again, causing the baffle to rotate and switch from the closed position to the open position, thus opening the air outlet duct. The designed button-type automotive air conditioning vent, through air outlet... The air vent assembly facilitates the formation of an air outlet channel, enabling directional air delivery in conjunction with the front-end automotive air conditioning system. A baffle can be switched between open and closed positions to block or open the air outlet channel. Force can be applied to the attitude control assembly via control buttons, allowing the baffle to switch between open and closed positions. Since passengers only need to press the control buttons to open and close the air vents, and can easily and quickly return the vents to their previous closed state, the user experience is greatly enhanced.

[0013] In one specific implementation, the attitude control assembly includes:

[0014] The lock body is connected to the control button, and a return spring is provided between the lock body and the air outlet assembly. One end of the return spring is connected to the lock body, and the other end is connected to the air outlet assembly.

[0015] The latching part is connected to the air outlet assembly, and the latch on the lock body can extend into the inner cavity of the latching part and achieve a locking and limiting action with the latching part;

[0016] A connecting plate, one end of which is rotatably connected to the lock body and the other end of which is rotatably connected to the baffle, and the rotation axis of the connecting plate is in the same direction as the rotation axis of the baffle.

[0017] By adopting the above technical solution, when the driver or passenger presses the control button, the control button applies force to the lock body, causing the lock body to overcome the elastic force of the return spring and move towards the latch until the latch tongue on the lock body extends into the inner cavity of the latch, thus achieving the latch engagement limit. At the same time, the lock body moves towards the baffle through the connecting plate, causing the baffle to rotate and switch between the open and closed positions. The designed posture control assembly facilitates the single press action of the control button through the lock body and the latch, and the connecting plate can transmit the movement of the lock body to the baffle to achieve the switching of the baffle between the open and closed positions.

[0018] In one specific implementation, a connector is connected to one end of the baffle, and the connector is rotatably connected to the end of the connecting plate away from the lock body, and the rotation axis of the baffle is offset from the rotation axes of the connector and the connecting plate.

[0019] By adopting the above technical solution, the designed connector can serve as an intermediate connecting structure to transmit external forces between the connecting plate and the baffle, and the baffle can be rotated by the cooperation of the connecting plate and the connector when the lock body slides.

[0020] In one specific implementation, the baffle has a protective edge extending outward, and the air outlet assembly has a sealing frame that matches the shape of the protective edge. The protective edge and the sealing frame are fitted together to seal the air outlet channel.

[0021] By adopting the above technical solutions, the designed edge protector and sealing frame can improve the reliability of the air outlet channel sealing. At the same time, the air outlet channel and the edge protector can be fitted together to limit the rotation angle of the baffle.

[0022] In one specific implementation scheme, the air outlet assembly includes:

[0023] Mounting base, the control button is slidably connected to the mounting base, and an inner decorative shell is rotatably connected to the mounting base;

[0024] An outer decorative shell is connected to the mounting base, and the outer decorative shell has an air outlet and a clearance hole for the control button to pass through.

[0025] An air outlet housing is connected to the mounting base, and the air outlet housing is hollow with openings at both ends to form an air outlet channel. The baffle is rotatably connected to the air outlet housing.

[0026] By adopting the above technical solution, the designed air outlet assembly can serve as the mounting base for control buttons, inner decorative shell, and outer decorative shell, and can form an air outlet channel through the air outlet shell.

[0027] In one specific implementation, an airflow control assembly is connected to the inner trim shell, the airflow control assembly comprising:

[0028] A lever, which is slidably connected to the inner decorative shell and slides along the rotation axis of the inner decorative shell;

[0029] Multiple air outlet blades, the air outlet blades are rotatably connected to the air outlet housing, and an air outlet guide gap is formed between two adjacent air outlet blades;

[0030] A linkage control component is connected to the toggle block and to the air outlet blades, used to make multiple air outlet blades rotate synchronously.

[0031] By adopting the above technical solution, the designed airflow control assembly can achieve synchronous rotation of multiple air outlet blades by applying force to the lever block and causing it to slide along the rotation axis of the inner decorative shell, thereby adjusting the airflow direction. By applying an external force to the lever block in the circumferential direction around the rotation axis of the inner decorative shell, the overall angle of the inner decorative shell can be adjusted, thereby changing the airflow direction.

[0032] In one specific implementation scheme, the linkage control component includes:

[0033] A transmission plate is connected to the lever block, and a strip-shaped sliding groove is formed on the transmission plate. Any of the air outlet blades extends into the strip-shaped sliding groove and is slidably connected to the transmission plate.

[0034] A linkage plate is simultaneously rotatably connected to multiple air outlet blades, and the connecting line formed by the rotatable connection between the linkage plate and the multiple air outlet blades is arranged parallel to the connecting line formed by the rotatable connection between the air outlet housing and the multiple air outlet blades.

[0035] By adopting the above technical solution, the designed linkage control component can cooperate with any air outlet blade through the transmission plate to realize the rotation of the air outlet blade connected to it, and can realize the synchronous rotation of multiple air outlet blades through the linkage plate.

[0036] In one specific implementation, the mounting base is connected to two rotation limiting blocks, the rotation limiting blocks are formed with an arc-shaped limiting groove coaxial with the rotation axis of the inner decorative shell, and the inner decorative shell is formed with a protrusion that extends into the arc-shaped limiting groove.

[0037] By adopting the above technical solution, the designed rotation limit block can restrict the rotation angle of the inner decorative shell.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. The designed button-type automotive air conditioning vent facilitates the formation of an air outlet channel through the vent assembly, thereby enabling directional air delivery in conjunction with the front-end automotive air conditioning system. The baffle can switch between an open and closed position to block or open the air outlet channel. The control button can apply force to the attitude control assembly, thereby switching the baffle between the open and closed positions. Since the driver and passengers only need to press the control button to control the opening and closing of the air outlet, and can also easily and quickly reset the air outlet to its previous closed state, it can greatly improve the user experience for the driver and passengers.

[0040] 2. The designed push-button car air conditioning vent uses a locking body to facilitate the single press of the control button in conjunction with the latch. The connecting plate can transmit the movement of the locking body to the baffle to switch the baffle between the open and closed positions.

[0041] 3. The designed button-type car air conditioning vent, when force is applied to the lever to make the lever slide along the rotation axis of the inner trim shell, can work with the linkage control component to realize the synchronous rotation of multiple air vent blades, thereby realizing the adjustment of the air outlet direction. By applying an external force to the lever in the circumferential direction around the rotation axis of the inner trim shell, the angle of the entire inner trim shell can be adjusted, thereby changing the air outlet direction. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of a button-type automotive air conditioning vent according to an embodiment of this application.

[0043] Figure 2 yes Figure 1 Another angle of the diagram is used to show the relative positional relationship between the air vent assembly and the baffle.

[0044] Figure 3 yes Figure 2 The partial structural diagram is mainly used to show the connection relationship between the air outlet housing and the attitude control assembly.

[0045] Figure 4 yes Figure 3 The schematic diagram in the image is mainly used to illustrate the connection relationship between the attitude control assembly and the baffle.

[0046] Figure 5 This is a three-dimensional structural diagram of the inner decorative shell and the wind direction control assembly in the embodiments of this application.

[0047] Figure 6 yes Figure 5 Another perspective of the diagram is used to show the specific structure of the linkage control components.

[0048] Explanation of reference numerals in the attached drawings: 1. Air outlet assembly; 11. Mounting base; 12. Inner decorative shell; 13. Outer decorative shell; 14. Air outlet housing; 141. Air outlet channel; 15. Sealing frame; 2. Baffle; 21. Edge protector; 3. Attitude control assembly; 31. Lock body; 32. Return spring; 33. Locking buckle; 34. Connecting plate; 4. Control button; 5. Connector; 6. Air direction control assembly; 61. Toggle block; 62. Air outlet blade; 63. Linkage control component; 631. Transmission plate; 632. Linkage plate; 7. Rotation limit block. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0050] This application discloses a button-type automotive air conditioning vent.

[0051] Reference Figure 1 and Figure 2 A push-button type automotive air conditioning vent includes an air vent assembly 1, a baffle 2, a posture control assembly 3, and a control button 4. The air vent assembly 1 has an air outlet channel 141 connected to the front end of the automotive air conditioning vent. The baffle 2 is located within the air outlet channel 141 and is rotatably connected to the air vent assembly 1. The posture control assembly 3 is mounted on the air vent assembly 1 and connected to the baffle 2. The control button 4 is slidably connected to the air vent assembly 1 and connected to the posture control assembly 3. When the control button 4 slides, the posture control assembly 3 causes the baffle 2 to be in an open or closed position. When switching between positions, and the baffle 2 is in the closed position, the air outlet duct 141 is blocked. When it is necessary to block the air outlet duct 141, force is applied to the control button 4 to make the control button 4 slide relative to the air outlet assembly 1. During the sliding process, the control button 4 applies force to the attitude control assembly 3, and the attitude control assembly 3 applies force to the baffle 2 to make the baffle 2 switch from the open position to the closed position, thereby blocking the air outlet duct 141. When it is necessary to open the air outlet duct 141, the control button 4 is pressed again, and the attitude control assembly 3 applies force to the baffle 2 again to make the baffle 2 rotate and switch from the closed position to the open position, thereby opening the air outlet duct 141.

[0052] Reference Figure 1 and Figure 2Specifically, the air outlet assembly 1 includes a mounting base 11, an inner decorative shell 12, an outer decorative shell 13, and an air outlet housing 14. The control button 4 slides with the mounting base 11, and the outer decorative shell 13 is snapped and fixed to the mounting base 11. The outer decorative shell 13 has an air outlet hole and a clearance hole. The inner decorative shell 12 is rotatably connected to the mounting base 11. Specifically, in order to limit the rotation angle of the inner decorative shell 12, two rotation limit blocks 7 are fixedly connected to the mounting base 11. The rotation limit blocks 7 have an arc-shaped limit groove. The central axis of the arc-shaped limit groove is coaxial with the rotation axis of the inner decorative shell 12. The inner decorative shell 12 has a protruding part that extends into the arc-shaped limit groove and is slidably connected to the rotation limit block 7.

[0053] Reference Figure 1 and Figure 2 The air outlet housing 14 is snapped and fixed to the mounting base 11, and the air outlet housing 14 is hollow. The two ends of the air outlet housing 14 are opened to form an air outlet channel 141, which is connected to the air outlet hole. The inner decorative shell 12 also has a cavity that connects the air outlet channel 141 and the air outlet hole. The baffle 2 is rotatably connected to the air outlet housing 14.

[0054] Reference Figure 3 Furthermore, a protective edge 21 is formed around the perimeter of the baffle 2, and a sealing frame 15 that matches the shape of the protective edge 21 is formed on the inner wall of the air outlet housing 14. When the baffle 2 rotates, it drives the protective edge 21 to rotate synchronously until the protective edge 21 and the sealing frame 15 are fitted together to block the air outlet channel 141. This can improve the reliability of the sealing of the air outlet channel 141. At the same time, the fit between the air outlet channel 141 and the protective edge 21 can also limit the rotation angle of the baffle 2.

[0055] Reference Figure 4Specifically, the attitude control assembly 3 includes a lock body 31, a latch 33, and a connecting plate 34. The lock body 31 is snapped and fixed to the control button 4, and the lock body 31 is slidably connected to the mounting base 11. A return spring 32 is provided between the lock body 31 and the mounting base 11. One end of the return spring 32 abuts against the lock body 31, and the other end abuts against the mounting base 11, which is used to reset the control button 4 after it is pressed. The latch 33 is snapped and fixed to the mounting base 11, and the latch on the lock body 31 can extend into the inner cavity of the latch 33. The connecting plate 34 is rotatably connected to the lock body 31 at one end and to the baffle 2 at the other end. The rotation axis of the connecting plate 34 is parallel to the rotation axis of the baffle 2. When the driver or passenger presses the control button 4, the control button 4 applies force to the lock body 31, causing the lock body 31 to move towards the lock latch 33 against the elastic force of the return spring 32, until the latch tongue on the lock body 31 extends into the inner cavity of the lock latch 33 to achieve the locking and limiting of the latch. At the same time, the lock body 31 moves towards the baffle 2 through the connecting plate 34, causing the baffle 2 to rotate and switch between the open and closed positions. The lock body 31 facilitates the locking and latch 33 to receive the single press action of the control button 4. The connecting plate 34 can transmit the movement of the lock body 31 to the baffle 2 to achieve the switching of the baffle 2 between the open and closed positions.

[0056] Reference Figure 4 More specifically, one end of the baffle 2 is integrally formed with a protruding rotating shaft, and the other end is snapped and fixed with a connector 5. The baffle 2 achieves a rotatable connection with the air outlet housing 14 through the protruding rotation and the connector 5. The connector 5 and the connecting plate 34 are rotatably connected at the end away from the lock body 31. The rotation axis of the baffle 2 is offset from the rotation axis of the connector 5 and the connecting plate 34. In this application, the connector 5 and the connecting plate 34 can be rotatably connected by a pin or by a ball joint. In this embodiment, the connector 5 and the connecting plate 34 are preferably connected by a ball joint.

[0057] Reference Figure 5 Furthermore, to facilitate the adjustment of the airflow direction, the push-button car air conditioning vent also includes an airflow control assembly 6. The airflow control assembly 6 includes a lever 61, an air outlet blade 62, and a linkage control component 63. A through groove is formed on the central guide post of the inner decorative shell 12. The lever 61 passes through the through groove and is connected to a lower buckle. The lever 61 and the lower buckle cooperate to improve the sliding stability of the lever 61 on the central guide post of the inner decorative shell 12, and the lever 61 slides along the rotation axis of the inner decorative shell 12.

[0058] Reference Figure 5There are multiple air outlet blades 62. The air outlet blades 62 are rotatably connected to the air outlet housing 14, and an air outlet guide gap is formed between two adjacent air outlet blades 62. The air outlet blades 62 are located in the air outlet channel 141. The linkage control component 63 is connected to the toggle block 61 and the linkage control component 63 is connected to the air outlet blades 62 to make multiple air outlet blades 62 rotate synchronously.

[0059] Reference Figure 5 and Figure 6 Specifically, the linkage control component 63 includes a transmission plate 631 and a linkage plate 632. The transmission plate 631 is engaged and fixed with the toggle block 61, and a strip-shaped sliding groove with one open end is formed on the transmission plate 631. One of the multiple air outlet blades 62 is the active air outlet blade 62, and the others are passive air outlet blades 62. The active air outlet blade 62 has a force-bearing column, which passes through the strip-shaped sliding groove and is slidably connected to the transmission plate 631. The force-bearing column can rotate relative to the transmission plate 631. 32 is rotatably connected to multiple air outlet blades 62, and the connecting line formed by the rotating connection of the linkage plate 632 and the multiple air outlet blades 62 is parallel to the connecting line formed by the rotating connection of the air outlet housing 14 and the multiple air outlet blades 62. By applying force to the lever 61, the lever 61 drives the active air outlet blades 62 to rotate through the transmission plate 631. The active air outlet blades 62 rotate around the rotation axis of the air outlet housing 14 and apply force to the linkage plate 632, so that the driven air outlet blades 62 rotate synchronously, thereby completing the adjustment of the air outlet direction.

[0060] The implementation principle of a button-type automotive air conditioning vent in this embodiment is as follows: When it is necessary to block the air outlet duct 141, force is applied to the control button 4, causing the control button 4 to slide relative to the air outlet assembly 1. During the sliding process, the control button 4 applies force to the attitude control assembly 3, which in turn applies force to the baffle 2, causing the baffle 2 to switch from the open position to the closed position, thus blocking the air outlet duct 141. When it is necessary to open the air outlet duct 141, the control button 4 is pressed again, and the attitude control assembly 3 applies force to the baffle 2 again, causing the baffle 2 to rotate and switch from the closed position to the open position, thus opening the air outlet duct 141. The air outlet assembly 1 facilitates the formation of an air outlet channel 141, thereby enabling directional air delivery in conjunction with the front-end automotive air conditioning system. The baffle 2 can be switched between an open and closed position to block or open the air outlet channel 141. The control button 4 can apply force to the attitude control assembly 3, thereby enabling the baffle 2 to switch between the open and closed positions. Since the driver and passengers only need to press the control button 4 to control the opening and closing of the air outlet, and can also easily and quickly reset the air outlet to its previous closed state, the user experience of the driver and passengers can be greatly improved.

[0061] When it is necessary to adjust the air outlet direction, by applying force to the lever 61 to make the lever 61 slide along the rotation axis of the inner decorative shell 12, the linkage control component 63 can be used to realize the synchronous rotation of multiple air outlet blades 62, thereby realizing the adjustment of the air outlet direction. By applying an external force to the lever 61 in the circumferential direction around the rotation axis of the inner decorative shell 12, the overall angle of the inner decorative shell 12 can be adjusted, thereby changing the air outlet direction.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A button-operated automotive air conditioning vent, characterized in that: include: An air outlet assembly (1) is provided, wherein an air outlet channel (141) is formed on the air outlet assembly (1); Baffle (2), the baffle (2) is located in the air outlet channel (141) and is rotatably connected to the air outlet assembly (1); An attitude control assembly (3) is mounted on the air outlet assembly (1) and is connected to the baffle (2); The control button (4) is slidably connected to the air outlet assembly (1) and connected to the attitude control assembly (3). After the control button (4) slides, the attitude control assembly (3) switches the baffle (2) between the open position and the closed position. When the baffle (2) is in the closed position, it blocks the air outlet channel (141).

2. The button-type automotive air conditioning vent according to claim 1, characterized in that: The attitude control assembly (3) includes: Lock body (31), the lock body (31) is connected to the control button (4), and a return spring (32) is provided between the lock body (31) and the air outlet assembly (1). One end of the return spring (32) is connected to the lock body (31), and the other end is connected to the air outlet assembly (1). The latch (33) is connected to the air outlet assembly (1), and the latch tongue on the lock body (31) can extend into the inner cavity of the latch (33) and achieve a snap-fit ​​and limit with the latch (33); A connecting plate (34) is rotatably connected at one end to the lock body (31) and at the other end to the baffle (2), and the rotation axis of the connecting plate (34) is in the same direction as the rotation axis of the baffle (2).

3. The button-type automotive air conditioning vent according to claim 2, characterized in that: One end of the baffle (2) is connected to a connector (5), which is rotatably connected to the end of the connecting plate (34) away from the lock body (31), and the rotation axis of the baffle (2) is offset from the rotation axis of the connector (5) and the connecting plate (34).

4. The button-type automotive air conditioning vent according to claim 1, characterized in that: The baffle (2) has an outer edge (21) and the air outlet assembly (1) has a sealing frame (15) that matches the shape of the edge (21). The edge (21) and the sealing frame (15) are fitted together to seal the air outlet channel (141).

5. The push-button type automotive air conditioning vent according to any one of claims 1-4, characterized in that: The air outlet assembly (1) includes: Mounting base (11), the control button (4) is slidably connected to the mounting base (11), and an inner decorative shell (12) is rotatably connected to the mounting base (11); An outer decorative shell (13) is connected to the mounting base (11), and an air outlet and a clearance hole for the control button (4) to pass through are formed on the outer decorative shell (13); An air outlet housing (14) is connected to the mounting base (11), and the air outlet housing (14) is hollow and has openings at both ends to form an air outlet channel (141). The baffle (2) is rotatably connected to the air outlet housing (14).

6. The button-type automotive air conditioning vent according to claim 5, characterized in that: An airflow control assembly (6) is connected to the inner decorative shell (12), the airflow control assembly (6) comprising: A lever (61) is slidably connected to the inner decorative shell (12), and the lever (61) slides along the rotation axis of the inner decorative shell (12); Multiple air outlet blades (62) are rotatably connected to the air outlet housing (14), and an air outlet guide gap is formed between two adjacent air outlet blades (62). A linkage control component (63) is connected to the toggle block (61) and the air outlet blades (62) to enable multiple air outlet blades (62) to rotate synchronously.

7. The push-button type automotive air conditioning vent according to claim 6, characterized in that: The linkage control component (63) includes: A transmission plate (631) is connected to the toggle block (61), and a strip-shaped sliding groove is formed on the transmission plate (631). Any of the air outlet blades (62) extends into the strip-shaped sliding groove and is slidably connected to the transmission plate (631). A linkage plate (632) is rotatably connected to multiple air outlet blades (62), and the connecting line formed by the rotatable connection of the linkage plate (632) and the multiple air outlet blades (62) is arranged parallel to the connecting line formed by the rotatable connection of the air outlet housing (14) and the multiple air outlet blades (62).

8. The push-button type automotive air conditioning vent according to claim 5, characterized in that: Two rotation limiting blocks (7) are connected to the mounting base (11). The rotation limiting blocks (7) have an arc-shaped limiting groove that is coaxial with the rotation axis of the inner decorative shell (12). The inner decorative shell (12) has a protrusion that extends into the arc-shaped limiting groove.

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