Electric air door and transmission mechanism

Abstract

The invention discloses an electric air door and a transmission mechanism, a driving tooth part of the transmission mechanism is provided with a guide part, the guide part is connected with a first tooth of the driving tooth part for driving an output gear to rotate in the circumferential direction, the outer circumferential surface of the guide part is in continuous transition with the tooth top surface of the first tooth of the driving tooth part, and the guide part is configured to rotate when the driving output gear rotates. And the front end of the guide part is positioned between the adjacent teeth of the main tooth part and the guide tooth part at the starting moment when the locking surface and the outer side tooth crest of the main tooth part are released from pressing and locking. By means of the scheme, it can be ensured that the driving tooth part crosses the first teeth of the main tooth part, and then the ideal normal meshing state is achieved. According to the electric air door applying the transmission structure, the corresponding output gear has good rotation output precision, so that the door plate can be accurately opened and closed in place, the opening degree of the door plate can be accurately adjusted, and good cold air volume adjusting precision is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and particularly to an electric air door and a transmission mechanism. Background Art

[0002] Please refer to Figure 1 , which shows a schematic structural diagram of a typical electric air door.

[0003] This electric air door is usually applied to the air duct system of an air-cooled refrigeration device to control the cold air flow blown by the fan to enter the refrigerating chamber through the air duct system. As Figure 1 shown, the transmission mechanism in the control box 10 drives the two door panels 20 and 30 to rotate relative to the door frame respectively, adjusts the opening and closing states of the first door panel 20 and the second door panel 30 in sequence, and realizes the adjustment of the through-flow rate of the first channel 40 and the second channel 50 by adjusting the opening degree of the corresponding door panel. For details, please further refer to Figure 2 and Figure 3 , where Figure 2 is Figure 1 the A-A cross-sectional view of Figure 3 and Figure 1 is the schematic diagram of the internal transmission structure of the control box shown in

[0004] During the working process, the stepping motor 101 drives the meshing input gear 102 and driving wheel 103 to rotate, and uses the multi-stage reduction respectively constructed between the driving wheel 103 and the first door panel output gear 105 and the second door panel output gear 106 to realize the transmission of the power for opening and closing the door panel. Based on the requirement of the working stability of the electric air door, this transmission mechanism has a door panel locking function. As shown in Figure 4 and Figure 5 , the stop wheel 104 is coaxially arranged with the driving wheel 103, its stop block 1041 is adapted to the driving wheel 103, and after the driving wheel 103 rotates a certain angle, it can circumferentially press against the stop block 1041, thereby driving the stop wheel 104 to rotate intermittently. The outer circumferential stop surface 1042 of the stop wheel 104 has a groove 1043 adapted to the tooth part 1062 of the output gear 106.

[0005] As Figure 4 shown, when the second door panel is in the closed state, the stop surface 1042 on one side of the groove 1043 of the stop wheel 104 radially presses against the tooth part 1062 of the output gear 106 to realize the reliable locking of the door panel. Similarly, when the second door panel is in the open state, the stop surface 1042 on the other side of the groove 1043 of the stop wheel 104 radially presses against the working tooth 1062 of the output gear 106, thereby preventing the door panel from shaking. Please refer to Figure 6, the figure shows a schematic diagram of the cooperation relationship between the stop wheel 104, the output gear 106, and the drive wheel 103 when the first door panel is fully opened and the second door panel is in the locked state before opening. When the second door panel is opened in this state and the drive wheel 103 drives the stop wheel 104 to rotate clockwise, the locked state between the stop wheel 104 and the output gear 106 is eliminated. The first tooth of the tooth part 1034 of the drive wheel 103 crosses the third tooth of the tooth part 1062 of the output gear 106 and meshes with the first tooth of the tooth part 1063, as specifically shown in Figure 7 . Thus, the output gear 106 can be driven to rotate, and the second door panel opens.

[0006] However, the outer diameter of the stop surface 1042 of the stop wheel 104 is larger than the outer diameter of the tooth top circle of the tooth part 1034 of the drive wheel 103. In the Figure 6 shown locked state, the output gear 106 deflects towards the output gear 106 side along the line connecting the center and the locking point. Therefore, at the moment when the stop wheel 104 is released, the output gear 106 that loses the locking constraint moves freely, resulting in uncertainty in gear meshing.

[0007] For example Figure 8 In a non-ideal state shown, the first tooth of the tooth part 1034 does not cross the third tooth of the tooth part 1062, and the first tooth of the tooth part 1034 meshes with the third tooth of the tooth part 1062, driving the output gear 106 to rotate. In this case, the second door panel can rotate, but there is a slight deviation in the angle.

[0008] Another example Figure 9 In the stuck state shown, the tooth top of the first tooth of the fourth gear 1034 abuts against the tooth top of the third tooth of the tooth part 1062, resulting in the entire gear set being stuck and the second door panel being unable to open. Summary of the Invention

[0009] To solve the above technical problems, the present invention provides an electric air door and a transmission mechanism to effectively avoid the meshing deviation that may occur between the tooth parts that are adapted at the moment of unlocking.

[0010] The present invention provides a transmission mechanism, including a driving wheel and an output gear that are adapted to each other, and a stop wheel; wherein, the output gear has a guiding tooth portion and a main tooth portion that are arranged in sequence in the circumferential direction, and the tooth profile of the main tooth portion extends axially to be circumferentially continuous with at least a part of the guiding tooth portion; the stop wheel is coaxially arranged with the driving wheel, and a stop surface for locking the output gear is provided on its outer circumference, and the addendum circle of the driving wheel is located radially inside the outer contour of the stop surface; the stop wheel can be intermittently rotated by the driving wheel and is configured as follows: when the stop wheel is in a non-rotating state, the stop surface presses against and locks the outer addendum of the main tooth portion of the output gear to lock the output gear; when the stop wheel is in a rotating state, the driving tooth portion can mesh with the tooth adjacent to the main tooth portion of the guiding tooth portion and the main tooth portion to drive the output gear to rotate; wherein, the driving tooth portion has a guiding portion, the guiding portion is circumferentially connected to the first tooth of the driving tooth portion that drives the output gear to rotate, and the outer circumferential surface of the guiding portion is continuously transitioned with the tooth top surface of the first tooth of the driving tooth portion and is configured as follows: at the starting moment when the output gear is driven to rotate and the stop surface is disengaged from pressing against and locking the outer addendum of the main tooth portion, the front end of the guiding portion is located between the main tooth portion and the adjacent tooth of the guiding tooth portion.

[0011] Compared with the background art, in view of the problem that it is necessary to ensure the meshing accuracy between the main tooth portion and the driving tooth portion of the output gear after releasing the pressing and locking of the output gear, a guiding portion is provided on the driving tooth portion in this solution. The outer circumferential surface of the guiding portion is continuously transitioned with the tooth top surface of the first tooth of the driving tooth portion and is configured as follows: at the starting moment when the output gear is driven to rotate and the stop surface is disengaged from pressing against and locking the outer addendum of the main tooth portion, the front end of the guiding portion is located between the main tooth portion and the adjacent tooth of the guiding tooth portion, so as to ensure that the driving tooth portion crosses the first tooth of the main tooth portion and further achieve an ideal normal meshing state. For an electric air damper applying this transmission structure, the good rotation output accuracy of the corresponding output gear can ensure that the opening and closing state of the door panel is in place accurately, and at the same time, the opening degree of the door panel can be accurately adjusted to obtain good cold air volume adjustment accuracy. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of a typical electric air damper described in the background art;

[0013] Figure 2 is Figure 1 the A-A cross-sectional view of

[0014] Figure 3 is Figure 1 the internal transmission structure schematic diagram of the control box shown in

[0015] Figure 4Schematic diagram of the positional relationship between some transmission components at the moment when the first door panel is fully opened and the second door panel is about to be opened;

[0016] Figure 5 It is Figure 3 and Figure 4 Schematic diagram of the stop wheel shown in;

[0017] Figure 6 It is Figure 4 Axial schematic diagram of the positional relationship between some transmission components in the locked state shown in;

[0018] Figure 7 Schematic diagram of the ideal meshing relationship between transmission components after unlocking;

[0019] Figure 8 and Figure 9 Respectively show two typical schematic diagrams of the non-ideal meshing relationship between transmission components after unlocking;

[0020] Figure 10 Overall structure schematic diagram of the drive wheel described in Embodiment 1;

[0021] Figure 11 It is Figure 10 Bottom view of the drive wheel shown in;

[0022] Figure 12 Front view of the second output gear;

[0023] Figure 13 Shows the schematic diagram of the adaptation positional relationship of the guiding part in the locked state;

[0024] Figure 14 Three-dimensional diagram of the adaptation positional relationship of the guiding part in the locked state;

[0025] Figure 15 Shows the schematic diagram of the adaptation positional relationship of the guiding part in the normal meshing state;

[0026] Figure 16 Three-dimensional diagram of the adaptation positional relationship of the guiding part in the normal meshing state;

[0027] Figure 17 Schematic diagram of the adaptation positional relationship of the guiding part of the transmission structure described in Embodiment 2;

[0028] Figure 18 Three-dimensional diagram of the adaptation positional relationship of the guiding part in the locked state of Embodiment 2.

[0029] In the figure:

[0030] Control box 1, first door panel 2, first door frame 4, first channel 5, second door panel 6, second door frame 8, second channel 9;

[0031] Stepper motor 101;

[0032] Input gear 102;

[0033] Drive wheel 103, first tooth part 1031, second tooth part 1032, third tooth part 1033, fourth tooth part 1034, guiding part 1035;

[0034] Stopper wheel 104, stopper 1041, stopping surface 1042, groove 1043;

[0035] First output gear 105, fifth tooth part 1051;

[0036] Second output gear 106, sixth tooth part 1061, seventh tooth part 1062, eighth tooth part 1063;

[0037] Drive wheel 103', drive tooth part 1034', guiding part 1035', stopper wheel 104', stopping surface 1042', output gear 106', main tooth part 1062', guiding tooth part 1063'. Specific implementation mode

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Embodiment 1:

[0040] Without loss of generality, this embodiment takes Figure 1 The shown typical electric air damper as the description subject, and details the meshing relationship guiding structure after unlocking in the transmission mechanism. It should be understood that other functional components and cooperation relationships of the transmission mechanism do not constitute a substantial limitation to the technical solution claimed in this application. It should be noted that in this embodiment, the same reference numerals are used as those in the background art part to mark components or structures, so as to clearly show the power transmission relationship. Here, the use of the corresponding reference numerals also does not constitute a substantial limitation to the technical solution claimed in this application.

[0041] As Figure 1 shown, the electric air damper has two cooling capacity control channels. Specifically, the first door panel 2 hinged to the first door frame 4 adjusts the flow state of the first channel 5, and the second door panel 6 hinged to the second door frame 8 adjusts the flow state of the second channel 9. Among them, the opening and closing and the adjustment of the opening degree of the two door panels are respectively driven by the two output ends of the control box 1. Combining Figure 2 and Figure 3As shown in the figure, a transmission mechanism is arranged in the control box 1. The first output gear 105 and the second output gear 106 of the transmission mechanism output corresponding driving forces through two output ends respectively. That is to say, the first output gear 105 drives the first door panel 2 to move, and the second output gear 106 drives the second door panel to move.

[0042] Among them, the transmission mechanism includes a driving wheel 103 that can be driven by a power source. Specifically, a stepping motor built in the control box can be used as the power source. Of course, an external power source can also be used for driving. For example, but not limited to the way shown in the figure, the input gear 102 arranged at the shaft end of the stepping motor 101 meshes with the first tooth part 1031 on the driving wheel 103 to form a first-stage transmission meshing relationship for power input.

[0043] Please refer to Figure 10 and Figure 11 , Figure 10 which is the overall structural schematic diagram of the driving wheel described in this embodiment. Figure 11 is Figure 10 the bottom view of the driving wheel shown in the figure.

[0044] The driving wheel 103 is also provided with a third tooth part 1033 and a fourth tooth part 1034. Among them, the third tooth part 1033 is adapted to the sixth tooth part 1061 and the seventh tooth part 1062 on the second output gear 106 to form a third-stage transmission meshing relationship for closing the second door panel 6; the fourth tooth part 1034 is adapted to the seventh tooth part 1062 and the eighth tooth part 1063 on the second output gear 106 to form a fourth-stage transmission meshing relationship for opening the second door panel 6.

[0045] In addition, the second tooth part 1032 arranged on the driving wheel 103 is used to be adapted to the fifth tooth part 1051 on the first output gear 105 to form a second-stage transmission meshing relationship for opening and closing the first door panel 2. The first output gear 105 and the second output gear 106 are coaxially arranged, and the relative ends of the two are pivotally connected. Specifically, the second tooth part 1032 can mesh with the fifth tooth part 1051 to drive the first output gear 105 to rotate so that the opening and closing actions of the two door panels are independent of each other.

[0046] Here, the second tooth part 1032, the third tooth part 1033 and the fourth tooth part 1034 are respectively meshing tooth groups, and are preferably circumferentially arranged at equal intervals and axially staggered respectively to meet the specific functional operations such as opening and closing of the two door panels.

[0047] Correspondingly, the second output gear 106 has a sixth tooth part 1061, a seventh tooth part 1062 and an eighth tooth part 1063 arranged in sequence in the circumferential direction, and the sixth tooth part 1061 and the eighth tooth part 1063 are axially staggered. Combining Figure 12As shown, this figure is the front view of the second output gear. Among them, the tooth profile of the seventh tooth part 1062 extends axially and is continuously tooth-shaped in the circumferential direction with at least part of the sixth tooth part 1061 and at least part of the eighth tooth part 1063 respectively; it can be understood that the entire tooth length of the sixth tooth part 1061 and the eighth tooth part 1063 shown in the figure is continuously tooth-shaped with the seventh tooth part 1062 in the circumferential direction. As an optimal solution, the meshing strength and performance are taken into account.

[0048] The stop wheel 104 coaxially arranged with the driving wheel 103 has a stop surface 1042 on its outer periphery for locking the second output gear 106. Combining Figure 5 and Figure 6 As shown, the pitch circle of the driving wheel 103 is located radially inside the outer contour of the stop surface 1042. Thus, when the stop wheel 104 rotates to the locking working position, the stop surface 1042 presses against the outer tooth tip B of the second output gear 106; the stop wheel 104 can be intermittently rotated by the driving wheel 103.

[0049] Specifically, combining Figure 6 and Figure 7 As shown, when the stop wheel 104 is in the non-rotating state, the stop surface 1042 presses against and locks the outer tooth tip B of the seventh tooth part 1062 of the second output gear 106 to lock the second output gear 106, thereby keeping the working posture of the door panel stable; when the stop wheel 104 is in the rotating state, the fourth tooth part 1034 can mesh with the tooth adjacent to the seventh tooth part 1062 of the eighth tooth part 1063 and the seventh tooth part 1062 to drive the second output gear 106 to rotate in the first direction (clockwise) so as to drive the second door panel 6 to open as Figure 7 shown. The third tooth part 1033 can mesh with the tooth adjacent to the seventh tooth part 1062 of the sixth tooth part 1061 and the seventh tooth part 1062 to drive the second output gear 106 to rotate in the second direction (counterclockwise) to drive the second door panel 6 to close.

[0050] In this solution, the fourth tooth part 1034 further has a guiding part 1035. Combining Figure 10 and Figure 11 As shown, the guiding part 1035 is circumferentially connected to the first tooth C of the fourth tooth part 1034 that drives the second output gear 106 to rotate in the first direction. Here, the "first tooth" refers to the "tooth" located on the front side of the rotation in the first direction.

[0051] At the same time, the outer peripheral surface of the guiding part 1035 is continuously transitioned with the tooth top surface of the first tooth of the fourth tooth part 1034 and is configured such that: at the starting moment when the second output gear 106 rotates in the second direction and the stop surface 1042 is released from pressing and locking with the outer tooth tip of the seventh tooth part 1062, the front end of the guiding part 1035 is located between the adjacent teeth of the seventh tooth part 1062 and the eighth tooth part 1063. Please refer toFigure 13 and Figure 14 , wherein Figure 13 shows a schematic diagram of the fitting position relationship of the guiding part in the locked state Figure 14 is a three-dimensional view of the fitting position relationship of the guiding part in the locked state. In order to clearly show the specific cooperation relationship of the guiding part, the part above the fourth tooth part 1034 of the driving wheel 103 in the figure is not shown

[0052] In this state, the first door panel 2 is opened, and at the starting moment when the closed second door panel 6 is opened, that is, the starting moment when the pressing and locking between the stopping surface 1042 and the seventh tooth part 1062 is released. As the driving wheel 103 drives the stopping wheel 104 to rotate in the first direction (clockwise), the guiding part 1035 constitutes a limit to the seventh tooth part 1062, so as to ensure that the first tooth of the fourth tooth part 1034 can smoothly and reliably cross the seventh tooth part 1062 at the meshing moment, ensuring an ideal normal meshing state. For details, please refer to Figure 15 and Figure 16 .

[0053] Wherein Figure 15 shows a schematic diagram of the fitting position relationship of the guiding part in the normal meshing state Figure 16 is a three-dimensional view of the fitting position relationship of the guiding part in the normal meshing state. With such a setting, for the electric air damper applying this transmission structure, the good rotation output accuracy of the corresponding output gear can ensure the accurate in-place state of the door panel opening and closing, and at the same time, it can accurately adjust the opening degree of the door panel, obtaining good cold air volume adjustment accuracy

[0054] In order to further improve the structural compactness, preferably, the guiding part 1035 is located on the tooth end side away from the fourth tooth part 1034 of the stopping wheel 104. Thus, the dimensional space between the fourth tooth part 1034 and the third tooth part 1033 in the axial direction can be fully utilized to realize this guiding function

[0055] In addition, the outer peripheral surface of the guiding part 1035 can be an arc surface with the same curvature as the tooth top surface of the fourth tooth part 1034. On the one hand, it can save the process cost, and at the same time, it can make the relative displacement between the two more smooth and avoid jamming

[0056] It should be noted that based on the setting sequence of the door panel actions, different fitting structures can be adopted to realize the corresponding dynamic cooperation relationship. For the axially relatively arranged stopping wheel 104 and driving wheel 103, for example but not limited to, an axially extending block 1041 is arranged on the end surface of the stopping wheel 104, and correspondingly, an arc-shaped groove (not shown in the figure) adapted to the block 1041 is arranged on the end surface of the driving wheel 103. The arc-shaped groove has a second preset circumferential length forming the displacement stroke of the block 1041 in the arc-shaped groove, so that the stopping wheel 104 can be intermittently rotated by the driving wheel 103

[0057] Of course, the matching stopper 1041 and the arc-shaped groove can also be arranged in the reverse way, that is, the arc-shaped groove is arranged on the matching end face of the stop wheel 104, and the stopper is arranged on the matching end face of the driving wheel. Similarly, on the basis of meeting the intermittent displacement stroke, the driving wheel 103 can drive the stop wheel 104 to rotate intermittently.

[0058] Furthermore, the tooth shape of the seventh tooth part 1062 preferably extends to the side of the driving wheel 103 axially away from the first output gear 105 to form a part that is pressure-contact locked and matched with the stop wheel 104; that is to say, the locking part of the seventh tooth part 1062 is located at the position radially opposite to the stop wheel 104 on the driving wheel 103. Correspondingly, the outer periphery of the stop wheel 104 has a groove 1043, and the groove 1043 is configured to have a second preset circumferential length to accommodate the seventh tooth part 1062 that releases the pressure-contact lock. With such a setting, when the pressure-contact lock is released, as the stop wheel 104 rotates, after the driving wheel 103 is reset, the seventh tooth part 1062 is placed in the groove 1043, and then the subsequent rotation and meshing actions can be smoothly executed to complete the opening degree adjustment of the second door panel 6.

[0059] It should be noted that the second tooth part 1032, the third tooth part 1033, and the fourth tooth part 1034 that are circumferentially spaced and evenly distributed. As shown in the figure, the sixth tooth part 1061, the seventh tooth part 1062, and the eighth tooth part 1063 all have 3 teeth, and the second tooth part 1032, the third tooth part 1033, and the fourth tooth part 1034 all have 4 teeth. Here, the number of teeth of each meshing tooth group can be selected according to the overall design requirements of different products, such as but not limited to the preferred examples shown in the figure. That is to say, the sixth tooth part 1061, the seventh tooth part 1062, and the eighth tooth part 1063 all have N teeth, and N is a plural number; correspondingly, the second tooth part 1032, the third tooth part 1033, and the fourth tooth part 1034 all have at least N + 1 teeth to meet the corresponding rotational function meshing requirements.

[0060] In addition to the foregoing transmission mechanism, this embodiment also provides an electric air door. Combining Figure 1 As shown, the first door panel 2 of the electric air door is hinged to the first door frame 4, and the second door panel 6 is hinged to the second door frame 8 to respectively control the flow states of the first channel 5 and the second channel 9; the foregoing transmission mechanism is arranged in the control box 1, and its two output ends respectively drive the first door panel 2 and the second door panel 6 to rotate; specifically, the first output gear 105 and the second output gear 106 of the transmission mechanism output driving forces through the two output ends respectively.

[0061] Embodiment Two:

[0062] Please refer to Figure 17 and Figure 18 wherein, Figure 17Schematic diagram of the adapted position relationship of the guiding part of the transmission structure described in this embodiment; Figure 18 Isometric view of the adapted position relationship of the guiding part in the locked state.

[0063] The core concept of this solution is the same as that of the first embodiment. A guiding part is provided on the driving gear to ensure the reliable accuracy of the meshing transmission relationship after unlocking. As shown in the figure, the transmission mechanism includes a driving wheel 103' having a driving tooth part 1034'. The adapted output gear 106' has a guiding tooth part 1063' and a main tooth part 1062' arranged circumferentially in sequence. The tooth profile of the main tooth part 1062' extends axially to be circumferentially continuous with at least part of the guiding tooth part 1063'. A stop wheel 104' coaxially arranged with the driving wheel 103' is used to lock the output gear 106' based on functional requirements. The outer circumference of the stop wheel 104' has a stop surface 1042' for locking the output gear 106'. The pitch circle of the driving wheel 103' is located radially inside the outer contour of the stop surface 1042'. The stop wheel 104' can be intermittently rotated by the driving wheel 103' and is configured such that when the stop wheel 104' is in a non-rotating state, the stop surface 1042' presses against the outer tooth tip of the main tooth part 1062' of the output gear 106' to lock the output gear 106'. When the stop wheel 104' is in a rotating state, the driving tooth part 1034' can mesh with the tooth adjacent to the main tooth part 1062' of the guiding tooth part 1063' and the main tooth part 1062' to drive the output gear 106' to rotate;

[0064] Among them, the driving tooth part 1034' has a guiding part 1035'. The guiding part 1035' is circumferentially connected to the first tooth of the driving tooth part 1034' that drives the output gear 106' to rotate. The outer peripheral surface of the guiding part 1035' is continuously transitioned with the tooth top surface of the first tooth of the driving tooth part 1034' and is configured such that when the output gear 106' rotates and at the starting moment when the stop surface 1042' releases the pressing and locking against the outer tooth tip of the main tooth part 1062', the front end of the guiding part 1035' is located between the adjacent teeth of the main tooth part 1062' and the guiding tooth part 1063'.

[0065] Similarly, preferably, the outer peripheral surface of the guiding part 1035' is an arc surface with the same curvature as the tooth top surface of the main tooth part 1062'. The other functional principles are the same as those of the first embodiment and will not be elaborated here.

[0066] It should be noted that for the above embodiments provided in this implementation manner, the other functional components of the transmission mechanism are not the core inventive points of this application, so they will not be elaborated here. Moreover, the number of teeth of each tooth part of the transmission mechanism is only for illustrative purposes in the figure. It should be understood that as long as the technical means are consistent with the core concept of this solution, they are within the scope of protection requested by this application.

[0067] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A transmission mechanism, characterized in that, Comprising: A driving wheel (103'), having a driving tooth portion (1034'); An output gear (106'), having a guiding tooth portion (1063') and a main tooth portion (1062') arranged circumferentially in sequence, and the tooth profile of the main tooth portion (1062') extends axially to be circumferentially continuous with at least part of the guiding tooth portion (1063'); A stop wheel (104'), coaxially arranged with the driving wheel (103), and having a stop surface (1042) on its outer periphery for locking the output gear (106'), and the pitch circle of the driving wheel (103') is located radially inside the outer contour of the stop surface (1042'); the stop wheel (104') can be intermittently rotated by the driving wheel (103), and is configured such that when the stop wheel (104') is in a non-rotating state, the stop surface (1042') presses against and locks the outer tooth tip of the main tooth portion of the output gear (106') to lock the output gear (106'); when the stop wheel (104') is in a rotating state, the driving tooth portion (1034') can mesh with the tooth adjacent to the main tooth portion (1062') of the guiding tooth portion (1063') and the main tooth portion (1062') to drive the output gear (106') to rotate; Wherein, the driving tooth portion (1034') has a guiding portion (1035'), the guiding portion (1035') is circumferentially connected to the first tooth of the driving tooth portion (1034') for driving the output gear (106') to rotate, and the outer peripheral surface of the guiding portion (1035') is continuously transitioned with the tooth top surface of the first tooth of the driving tooth portion (1034'), and is configured such that at the starting moment when the output gear (106') is driven to rotate and the stop surface (1042') is released from pressing against and locking the outer tooth tip of the main tooth portion (1062'), the front end of the guiding portion (1035') is located between the adjacent teeth of the main tooth portion (1062') and the guiding tooth portion (1063').

2. The transmission mechanism according to claim 1, characterized in that, The outer peripheral surface of the guiding portion (1035') is an arc surface having the same curvature as the tooth top surface of the main tooth portion (1062').

3. A transmission mechanism, characterized in that, Comprising: A driving wheel (103) that can be driven by a power source, having a third tooth portion (1033) and a fourth tooth portion (1034) arranged circumferentially and separated, and the third tooth portion (1033) and the fourth tooth portion (1034) are axially offset; A second output gear (106), having a sixth tooth portion (1061), a seventh tooth portion (1062) and an eighth tooth portion (1063) arranged circumferentially in sequence, and the sixth tooth portion (1061) and the eighth tooth portion (1063) are axially offset; the tooth profile of the seventh tooth portion (1062) extends axially to be circumferentially continuous with at least part of the sixth tooth portion (1061) and at least part of the eighth tooth portion (1063) respectively; The stop wheel (104) is coaxially arranged with the driving wheel (103), and its outer periphery has a stop surface (1042) for locking the second output gear (106). The addendum circle of the driving wheel (103) is located radially inside the outer contour of the stop surface (1042). The stop wheel (104) can be intermittently rotated by the driving wheel (103) and is configured such that when the stop wheel (104) is in a non-rotating state, the stop surface (1042) presses against and locks the outer addendum of the seventh tooth part (1062) of the second output gear (106) to lock the second output gear (106). When the stop wheel is in a rotating state, the fourth tooth part (1034) can mesh with the tooth adjacent to the seventh tooth part (1062) of the eighth tooth part (1063) and the seventh tooth part (1062) to drive the second output gear (106) to rotate in the first direction, and the third tooth part (1033) can mesh with the tooth adjacent to the seventh tooth part (1062) of the sixth tooth part (1061) and the seventh tooth part (1062) to drive the second output gear (106) to rotate in the second direction. Wherein, the fourth tooth part (1034) has a guiding part (1035). The guiding part (1035) is circumferentially connected to the first tooth of the fourth tooth part (1034) that drives the second output gear (106) to rotate in the first direction. The outer peripheral surface of the guiding part (1035) is continuously transitioned with the tooth top surface of the first tooth of the fourth tooth part (1034) and is configured such that at the starting moment when driving the second output gear (106) to rotate in the second direction and the stop surface (1042) releases the pressing and locking with the outer addendum of the seventh tooth part (1062), the front end of the guiding part (1035) is located between the adjacent teeth of the seventh tooth part (1062) and the eighth tooth part (1063).

4. The transmission mechanism according to claim 3, wherein, The guiding part (1035) is located on the tooth end side of the fourth tooth part (1034) away from the stop wheel (104).

5. The transmission mechanism according to claim 4, wherein The outer peripheral surface of the guiding part (1035) is an arc surface with the same curvature as the tooth top surface of the fourth tooth part (1034).

6. The transmission mechanism according to claim 3, characterized in that, The stop wheel (104) and the driving wheel (103) are axially oppositely arranged. An axially extending stop block (1041) is provided on the end surface of one of them, and an arc-shaped groove adapted to the stop block (1041) is provided on the end surface of the other. The arc-shaped groove is configured to have a second preset circumferential length forming the displacement stroke of the stop block (1041) in the arc-shaped groove, so that the stop wheel (104) can be intermittently rotated by the driving wheel (103).

7. The transmission mechanism according to any one of claims 3 to 6, characterized in that, The transmission mechanism further includes: A first output gear (105) having a fifth tooth part (1051). The first output gear (105) is coaxially arranged with the second output gear (106), and their relative ends are pivotally connected. The driving wheel (103) further has a second tooth portion (1032), and the second tooth portion (1032) is axially offset from the third tooth portion (1033) and the fourth tooth portion (1034) respectively, and is circumferentially spaced apart; The second tooth portion (1032) can be engaged with the fifth tooth portion (1051) to drive the first output gear (105) to rotate.

8. The transmission mechanism according to claim 7, wherein, The tooth profile of the seventh tooth portion (1062) extends to the side of the driving wheel (103) axially away from the first output gear (105) to form a portion adapted to press and lock with the stop wheel (104); correspondingly, the outer periphery of the stop wheel (104) has a groove (1043), and the groove (1043) is configured to have a second preset circumferential length to accommodate the seventh tooth portion (1062) that releases the press and lock.

9. The transmission mechanism according to claim 8, characterized in that, The second tooth portion (1032), the third tooth portion (1033) and the fourth tooth portion (1034) are circumferentially spaced and evenly distributed.

10. The transmission mechanism according to claim 9, characterized in that, The sixth tooth portion (1061), the seventh tooth portion (1062) and the eighth tooth portion (1063) all have N teeth, where N is a plural number; the second tooth portion (1032), the third tooth portion (1033) and the fourth tooth portion (1034) all have at least N + 1 teeth.

11. An electric air damper, characterized in that, It includes a first door panel (2), a second door panel (6) and a control box (1). The first door panel (2) and the second door panel (6) are respectively hinged to a first door frame (4) and a second door frame (8) to respectively control the flow states of a first channel (5) and a second channel (9); the control box (1) has two output ends that respectively drive the first door panel (2) and the second door panel (6) to rotate; a transmission mechanism is arranged in the control box (1), and two output gears (105, 106) of the transmission mechanism output driving forces through the two output ends respectively, and the transmission mechanism adopts the transmission mechanism according to any one of claims 3 to 10.

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