Flip cover structure for breathing machine

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a flip cover structure for a breathing machine. The flip cover structure for the breathing machine comprises a box body, an upper cover and a locking structure, a hinge side and a clamping side are formed on the two opposite sides of the upper cover respectively, the hinge side is hinged to the box body, a torsional spring is installed between the hinge side and the box body, an installation bin is arranged in the box body, and an installation opening is formed in a top plate of the box body; the locking structure comprises a clamping tongue, a key, a first reset piece and a second reset piece, the key is installed in the installation bin in a sliding mode in the first direction, the clamping tongue is installed in the installation bin in a sliding mode in the second direction, and the key can overcome the elastic force of the second reset piece to move and drive the clamping tongue to overcome the elastic force of the first reset piece to move so as to relieve clamping connection between the clamping tongue and the clamping connection side; a matching hole is formed in the clamping tongue, a stopping part is arranged at the bottom end of the key, a limiting structure is arranged between the stopping part and the clamping tongue, and the stopping part can be matched with the limiting structure in a stopping manner when the key is reset; the first direction is the opening direction of the mounting opening.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, in particular to a flip cover structure for a ventilator. Background Art

[0002] A positive pressure ventilation machine is a type of ventilator. A humidifier heater is installed in the box of the positive pressure ventilation machine. The upper cover of the positive pressure ventilation machine is buckled on the box. When it is necessary to add water to the water tank of the humidifier heater or remove the water tank, the upper cover is opened.

[0003] The common structural form between the upper cover and the box body is: one end of the upper cover is hinged on the box body, and the other end of the upper cover is locked with the box body through a snap-fit ​​structure. A button that can drive the snap to unlock is set on the box body, and the upper cover can be flipped over by pressing the button.

[0004] However, the existing positive pressure ventilation ventilator generally sets the button on the side of the box. When opening the upper cover, one hand presses the button and the other hand presses the box to keep it still. This requires two hands to operate, making it inconvenient to unlock the upper cover. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide a flip cover structure for a respirator in view of the problem that it is inconvenient to unlock the upper cover of the existing respirator.

[0006] In order to solve the above technical problems, the embodiment of the utility model provides a flip cover structure for a ventilator, comprising a box body, an upper cover and a locking structure, wherein the upper cover has two opposite sides respectively forming a hinged side and a clamping side, the hinged side is hinged to the box body, a torsion spring is installed between the hinged side and the box body, an installation bin is arranged in the box body, and an installation port communicating with the installation bin is formed on the top plate of the box body;

[0007] The locking structure comprises a latch tongue, a button, a first reset member and a second reset member, the latch tongue can be locked on the locking side when the upper cover is closed, the button is slidably installed in the installation bin along a first direction, the latch tongue is slidably installed in the installation bin along a second direction perpendicular to the first direction, and the button can overcome the elastic force of the second reset member when pressed and drive the latch tongue to overcome the elastic force of the first reset member and move, so as to release the locking connection between the latch tongue and the locking side;

[0008] A through fitting hole is provided on the latch tongue, a stopping portion passing through the fitting hole is provided at the bottom end of the button, a limiting structure is provided between the stopping portion and the latch tongue, and the stopping portion can cooperate with the limiting structure when the button is reset; wherein the first direction is the opening direction of the installation port.

[0009] Optionally, the button includes a push rod and a pressing plate connected to the top end of the push rod, the push rod is inserted into the matching hole, and the stop portion is formed on the push rod.

[0010] Optionally, a stopping step protruding radially outward is formed on the push rod, and the stopping step constitutes the stopping portion.

[0011] Optionally, the limiting structure includes two limiting plates extending horizontally along the second direction and spaced apart, the two limiting plates are fixed on the mounting bin, the push rod passes through the space formed between the two limiting plates, the bottom surface of the limiting plate can cooperate with the stopping step, and the top surface of the limiting plate supports the latch.

[0012] Optionally, a guide hole opening in a direction away from the pressing plate is provided at the bottom end of the push rod, and the top end of the second reset member is inserted into the guide hole.

[0013] Optionally, a card slot is provided on the card connection side of the upper cover, and the end of the card tongue has a card hook extending out of the installation compartment along the second direction, and the card hook can be stuck in the card slot when the upper cover is closed.

[0014] Optionally, the locking structure also includes a fixed seat, and a side of the installation bin away from the locking tongue and the locking side is an open structure, and the fixed seat includes a first fixed plate, an extension arm and a second fixed plate, the first fixed plate and the second fixed plate are arranged in parallel and spaced apart along the second direction, the extension arm extends along the second direction and connects the first fixed plate and the second fixed plate, the first fixed plate is fixed on the open side of the installation bin, and the end of the first reset member away from the locking tongue is fixed to the second fixed plate.

[0015] Optionally, a guide groove penetrating along the second direction is provided on the first fixing plate, the longitudinal cross-sectional shape of the guide groove is the same as the longitudinal cross-sectional shape of the latch tongue, and the latch tongue can be guided and moved in the guide groove.

[0016] Optionally, a guide structure extending along the second direction is provided on the latch tongue, and the first resetting member cooperates with the guide structure sleeve to guide the first resetting member.

[0017] Optionally, a notch is provided on the outer wall of the button, and the side wall of the notch away from the stopping portion is inclined in a direction away from the stopping portion to form a first inclined surface; the hole opening of the mating hole away from the stopping portion is provided with an inner chamfer to form a second inclined surface, and the first inclined surface can drive the tongue to disengage from the engaging side through the second inclined surface when the button is pressed.

[0018] In the flip cover structure for a ventilator of the utility model, the hinged side of the upper cover is hinged to the box body, the mounting port on the top plate of the box body is connected to the mounting bin, and the button is slidably mounted in the mounting bin along the opening direction of the mounting port. When the upper cover needs to be opened, only one hand is needed to press the button downward, so that the button overcomes the elastic force of the second reset member and moves, and pushes the latch to overcome the first reset member and move in a direction perpendicular to the moving direction of the button, so that the latch is released from the latching side of the upper cover, so that the upper cover can be automatically flipped under the action of the torsion spring, thereby avoiding the situation in the prior art where the upper cover needs to be opened with two hands, making it easier for the user to open the upper cover, and improving the convenience of opening the upper cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a flip cover structure for a ventilator provided by an embodiment of the utility model;

[0020] Figure 2 yes Figure 1 A longitudinal cross-section when the key is pressed;

[0021] Figure 3 yes Figure 1 A longitudinal cross-sectional view of the button being reset after the upper cover is opened;

[0022] Figure 4 yes Figure 1 Schematic diagram of the structure after hiding part of the cabinet;

[0023] Figure 5 yes Figure 4 A structural diagram from another perspective;

[0024] Figure 6 yes Figure 4 Explosion diagram of

[0025] Figure 7 yes Figure 4 Schematic diagram of the structure of the middle button;

[0026] Figure 8 yes Figure 4 Schematic diagram of the structure of the middle tab.

[0027] The reference numerals in the specification are as follows:

[0028] 1. Box body; 11. Installation compartment; 12. Installation port; 13. Limit plate; 14. Connecting column; 2. Upper cover; 21. Card slot; 3. Button; 31. Press plate; 32. Push rod; 33. First inclined surface; 34. Stopper; 35. Notch; 4. Card tongue; 41. Matching hole; 42. Guide structure; 43. Second inclined surface; 44. Card hook; 45. Third inclined surface; 46. Fourth inclined surface; 5. First reset member; 6. Second reset member; 7. Fixed seat; 71. First fixed plate; 72. Extension arm; 73. Second fixed plate; 74. Guide slot; 8. Rotating axis; 9. Torsion spring. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] The utility model provides a flip cover structure for a breathing machine, which is used for buckling an upper cover 2 on a box body 1 and flipping open the upper cover 2 when needed.

[0031] The flip cover structure for a ventilator in one embodiment of the utility model is applied to a positive pressure ventilation ventilator. A humidification heater is installed in the box body 1 of the positive pressure ventilation ventilator. When the upper cover 2 is closed, the upper cover 2 covers the top opening of the water tank of the humidification heater. When it is necessary to add water to the water tank of the humidification heater or remove the water tank, the upper cover 2 is flipped open.

[0032] like Figure 1 and Figure 2 As shown, a flip cover structure for a ventilator provided by an embodiment of the utility model comprises a box body 1, an upper cover 2 and a locking structure, wherein the upper cover 2 has a hinged side and a clamping side formed on opposite sides thereof, the hinged side is hinged to the box body 1, and a torsion spring 9 is installed between the hinged side and the box body 1, so that the upper cover 2 can be automatically flipped open under the action of the torsion spring 9. An installation bin 11 is provided in the box body 1, and an installation port 12 communicating with the installation bin 11 is formed on the top plate of the box body 1.

[0033] The locking structure includes a latch 4, a button 3, a first reset member 5, and a second reset member 6. The latch 4 can be locked at the locking side when the upper cover 2 is closed to lock the upper cover 2 and the box body 1. The button 3 is slidably installed in the installation chamber 11 along a first direction, and the latch 4 is slidably installed in the installation chamber 11 along a second direction perpendicular to the first direction, wherein the first direction is the opening direction of the installation opening 12. Figure 2 As shown, the button 3 can overcome the elastic force of the second reset member 6 and drive the latch tongue 4 to overcome the elastic force of the first reset member 5 when pressed, so as to release the latch tongue 4 from the latching side, thereby enabling the upper cover 2 to be opened.

[0034] like Figure 3 and Figure 6 As shown, the latch tongue 4 is provided with a through mating hole 41, the bottom end of the button 3 is provided with a stopper 34 passing through the mating hole 41, a limiting structure is provided between the stopper 34 and the latch tongue 4, and the stopper 34 can be matched with the limiting structure when the button 3 is reset.

[0035] Since an installation opening 12 is formed on the top plate of the box body 1, the button 3 is slidably installed in the installation compartment 11 along the opening direction of the installation opening 12. Therefore, when the upper cover 2 needs to be opened, only one hand is needed to press the button 3 downward on the top of the box body 1, so that the button 3 drives the latch 4 to release the latching side of the upper cover 2, so that the upper cover 2 can be automatically opened under the action of the torsion spring 9, avoiding the situation in the prior art that the upper cover 2 needs to be opened with two hands, making it convenient for the user to open the upper cover 2.

[0036] like Figure 3 As shown, after the upper cover 2 is opened, the button 3 is released, the second reset member 6 is deformed again, and the button 3 moves in the opposite direction under the action of the second reset member 6 until the stopper 34 on the button 3 is engaged with the limit structure, and the button 3 is reset to its original position. During the reset process of the button 3, the latch tongue 4 is restored to its original position under the action of the first reset member 5, so that the latch tongue 4 can be locked on the upper cover 2 again when the upper cover 2 is closed.

[0037] When the button 3 is reset, the stop portion 34 cooperates with the stop structure to limit the reset position of the button 3 after the second reset member 6 recovers its deformation, thereby preventing the button 3 from popping out of the installation opening 12 after the second reset member 6 releases its elastic potential energy.

[0038] In the flip cover structure for the ventilator of the utility model, the hinged side of the upper cover 2 is hinged to the box body 1, the installation port 12 on the top plate of the box body 1 is connected to the installation bin 11, and the button 3 is slidably installed in the installation bin 11 along the opening direction of the installation port 12. When it is necessary to open the upper cover 2, only one hand is needed to press the button 3 downward, so that the button 3 overcomes the elastic force of the second reset member 6 and moves, and pushes the latch 4 to overcome the first reset member 5 and move in a direction perpendicular to the moving direction of the button 3, so that the latch 4 is released from the latching side of the upper cover 2, so that the upper cover 2 can be automatically flipped under the action of the torsion spring 9, avoiding the situation in the prior art that the upper cover 2 needs to be flipped with two hands, making it easier for users to open the upper cover 2, and improving the convenience of opening the upper cover 2.

[0039] In one embodiment, a support ear is formed on the hinged side of the upper cover 2, a through hole is formed on the support ear, a rotating shaft 8 is installed in the through hole, the rotating shaft 8 cooperates with the shaft hole of the through hole, mounting holes are formed at both ends of the rotating shaft 8 on the box body 1, both ends of the rotating shaft 8 pass through the through holes and cooperate with the corresponding shaft holes of the mounting holes, a torsion spring 9 is sleeved on both ends of the rotating shaft 8 passing through the through holes, and one end of the torsion spring 9 is fixed on the rotating shaft 8.

[0040] In one embodiment, the button 3 includes a push rod 32 and a pressing plate 31 connected to the top of the push rod 32. The push rod 32 is inserted into the matching hole 41, and the stopper 34 is formed on the push rod 32. When the upper cover 2 needs to be opened, the pressing plate 31 is pressed downward.

[0041] The cross-sectional area of ​​the pressing plate 31 is larger than that of the push rod 32, so as to increase the pressing area while reducing the size of the portion of the button 3 that passes through the matching hole 41, thereby reducing the size of the matching hole 41, and further reducing the volume of the tongue 4 and the space occupied by the locking structure.

[0042] like Figure 1 and Figure 3 The shape of the mounting opening 12 is the same as that of the pressing plate 31 . When the button 3 is reset, the pressing plate 31 is located at the mounting opening 12 , and there is a small gap between the outer peripheral edge of the pressing plate 31 and the mounting opening 12 .

[0043] In one embodiment, if Figure 6 As shown, a stop step protruding radially outward is formed on the push rod 32, and the stop step constitutes the stop portion 34. The stop step is integrally formed with the push rod 32, and the structure is simple and convenient. Moreover, the stop step has a high structural strength and a long service life.

[0044] In one embodiment, the limiting structure includes two limiting plates 13 extending horizontally along the second direction. The two limiting plates 13 are spaced apart along their extending direction and fixed on the installation bin 11. The push rod 32 passes through the gap formed between the two limiting plates 13. The bottom surface of the limiting plate 13 is engaged with the stopping step, and the top surface of the limiting plate 13 supports the latch 4.

[0045] In one embodiment, a guide hole opening in a direction away from the pressing plate 31 is provided at the bottom end of the push rod 32, and one end of the second reset member 6 is inserted into the guide hole. The hole wall of the guide hole contacts the outer wall of the second reset member 6. The guide hole can guide when the second reset member 6 is elastically deformed to avoid the second reset member 6 from tilting when the key 3 is pressed, thereby causing the key 3 to tilt.

[0046] Moreover, compared with the guide structure provided on the pressing plate 31 for guiding the second reset member 6, which is easy for the second reset member 6 to interfere with the limit plate 13, the guide hole is provided at the bottom end of the push rod 32 passing through the gap formed between the two limit plates 13, which can avoid the interference of the second reset member 6 with the limit plate 13.

[0047] In one embodiment, a positioning groove is provided on the bottom wall of the installation chamber 11, and the bottom end of the second restoring member 6 is fixed in the positioning groove.

[0048] In one embodiment, the second restoring member 6 is a spring.

[0049] In other embodiments, the second restoring member 6 may be a rubber member.

[0050] In one embodiment, if Figures 3 to 5 As shown, a card slot 21 is provided on the card connection side of the upper cover 2, and the end of the card tongue 4 has a card hook 44 extending out of the installation chamber 11 along the second direction, and the card hook 44 can be stuck in the card slot 21 when the upper cover 2 is closed.

[0051] In one embodiment, if Figure 5 As shown, the hook 44 is formed by the horizontal extension of the tongue 4 along the second direction, and a third inclined surface 45 and a fourth inclined surface 46 located below the third inclined surface 45 are provided on the end surface of the tongue 4, the third inclined surface 45 is connected to the top surface of the tongue 4, and the fourth inclined surface 46 is connected to the bottom surface of the tongue 4, and the third inclined surface 45 and the fourth inclined surface 46 both have an angle with the moving direction of the tongue 4 and are inclined toward the direction of the first reset member 5.

[0052] When the upper cover 2 is closed downward, the upper cover 2 rests on the third inclined surface 45 and pushes the latch 4 to move into the installation chamber 11 through the third inclined surface 45 until the latch 4 completely enters the installation chamber 11. The upper cover 2 is closed on the box body 1, and the compressed first reset member 5 releases its elastic potential energy, so that the hook 44 extends out of the installation chamber 11 and is inserted into the slot 21.

[0053] When the button 3 is pressed, the torsion spring 9 applies an upward flipping force to the upper cover 2, and the upper cover 2 pushes the latch 4 to move into the installation chamber 11 through the fourth inclined surface 46 until the hook 44 is disengaged from the slot 21, and the latching side of the upper cover 2 is released from the latch 4, and the upper cover 2 can be automatically flipped.

[0054] In one embodiment, as 4 and Figure 6 As shown, the locking structure also includes a fixing seat 7, and the side of the mounting bin 11 away from the latch tongue 4 and the engaging side engaging position is an open structure, and the fixing seat 7 includes a first fixing plate 71, an extending arm 72 and a second fixing plate 73, the first fixing plate 71 is fixed to the opening side of the mounting bin 11, the first fixing plate 71 and the second fixing plate 73 are arranged in parallel and spaced apart along the second direction, the extending arm 72 extends along the second direction and connects the first fixing plate 71 and the second fixing plate 73, and the end of the first reset member 5 away from the latch tongue 4 is fixed to the second fixing plate 73.

[0055] In one embodiment, the top of the side panel of the box body 1 extends in a direction away from the hinged side of the upper cover 2 to form a surrounding panel, and the surrounding panel encloses to form a square installation compartment 11.

[0056] In one embodiment, connecting holes that penetrate along the thickness direction are provided at both ends of the first fixing plate 71, and corresponding connecting columns 14 are provided on the installation bin 11. The connecting columns 14 are provided with internal threaded holes. One end of the screw passes through the connecting hole and is threadedly connected to the internal threaded hole to fix the first fixing plate 71 on the opening side of the installation bin 11.

[0057] In other embodiments, the first fixing plate 71 may be fixed to the installation bin 11 by clamping, welding, riveting, or the like.

[0058] In one embodiment, a guide groove 74 penetrating along the second direction is provided on the first fixing plate 71, and the longitudinal cross-sectional shape of the guide groove 74 is the same as the longitudinal cross-sectional shape of the latch tongue 4. The side wall of the guide groove 74 contacts the outer wall of the latch tongue 4, so that the latch tongue 4 can be guided and moved in the guide groove 74, thereby improving the stability of the latch tongue 4 during movement, and further improving the reliability of the latch tongue 4 being released from the upper cover 2 and the latch tongue 4 being engaged with the upper cover 2.

[0059] In one embodiment, a guide structure 42 extending along the second direction is provided on the tongue 4, and the first reset member 5 is plugged into the guide structure 42. The guide structure 42 can guide the first reset member 5 so that the first reset member 5 is elastically deformed along the second direction, thereby being able to apply a force to the tongue 4 along its movement direction, which is beneficial to the stability of the movement of the tongue 4.

[0060] In one embodiment, the first restoring member 5 is a spring.

[0061] In other embodiments, the first restoring member 5 may be a rubber member.

[0062] In one embodiment, a guide cylinder extending along its moving direction is provided on one side of the latch tongue 4, and the first reset member 5 is inserted in the guide cylinder. The inner diameter of the guide cylinder is adapted to the outer diameter of the second reset member 6, and one end of the first reset member 5 is against the bottom wall of the guide cylinder, and the other end of the first reset member 5 extends out of the guide cylinder and is fixed on the second fixed plate 73, and the guide cylinder constitutes the above-mentioned guide structure 42.

[0063] In other embodiments, a first guide column extending along the second direction may be provided on the latch tongue 4 , and the first resetting member 5 may be sleeved on the first guide column, and the first guide column constitutes the above-mentioned guide structure 42 .

[0064] In one embodiment, if Figures 6 to 8As shown, a notch 35 is provided on the outer wall of the push rod 32, and the side wall of the notch 35 away from the stop portion 34 is inclined in a direction away from the stop portion 34 to form a first inclined surface 33. The opening of the matching hole 41 away from the stop portion 34 is provided with an inner chamfer to form a second inclined surface 43, and the first inclined surface 33 can drive the tongue 4 to move in a direction perpendicular to the moving direction of the key 3 through the second inclined surface 43 when the key 3 is pressed.

[0065] In one embodiment, if Figure 2 and Figure 7 As shown, the side wall of the notch 35 close to the stopping portion 34 is perpendicular to the moving direction of the button 3. When the latch 4 is latched on the latching side of the upper cover 2, the first inclined surface 33 is attached to the second inclined surface 43, and the side wall of the notch 35 close to the stopping portion 34 is latched with the bottom surface of the latch 4 to lock the button 3 and the latch 4, so that the user can no longer press the button 3, so as to remind the user to press it into place.

[0066] In other embodiments, the button 3 may only include the push rod 32 , and when the upper cover 2 needs to be opened, the top of the push rod 32 may be pressed to move the button 3 downward.

[0067] In other embodiments, the stopping portion 34 may be a limiting protrusion formed on the push rod 32 and protruding radially outward, or the stopping portion 34 may be a limiting pin or a screw fixed on the push rod 32 and extending radially along the push rod 32 .

[0068] In other embodiments, the limiting structure may be a limiting pin or a screw fixed on the installation bin 11 and extending along the second direction, or may be a plurality of limiting members fixed at the bottom of the latch tongue 4, such as a hemispherical protrusion.

[0069] In other embodiments, a second guide column extending along the first direction can be provided on the side of the pressing plate 31 facing the installation bin 11, and the second reset member 6 is sleeved on the second guide column. The top end of the second reset member 6 rests on the pressing plate 31, and the bottom end is fixed on the installation bin 11.

[0070] In other embodiments, a hook 44 may be provided on the engaging side of the upper cover 2 , and correspondingly, a slot 21 opening in a direction away from the installation compartment 11 may be provided on the end of the latch tongue 4 .

[0071] In other embodiments, the fixing seat 7 may be omitted, the installation chamber 11 may be a box body 1 structure with an opening facing upward, and the end of the first restoring member 5 away from the latch tongue 4 is fixed to the installation chamber 11 .

[0072] In other embodiments, an arc-shaped protrusion can be provided on the outer wall of the button 3, and a chamfer can be provided at the opening of the matching hole 41. When the button 3 is pressed, the arc-shaped protrusion gradually enters the matching hole 41, pushing the latch tongue 4 to compress the first reset member 5 and move along the second direction, so that the latch tongue 4 is released from the locking side of the upper cover 2.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flip cover structure for a ventilator, It is characterized in that The invention comprises a box body (1), an upper cover (2) and a locking structure, wherein two opposite sides of the upper cover (2) respectively form a hinged side and a clamping side, the hinged side is hinged to the box body (1), a torsion spring (9) is installed between the hinged side and the box body (1), an installation bin (11) is arranged in the box body (1), and an installation opening (12) communicating with the installation bin (11) is formed on the top plate of the box body (1); The locking structure comprises a latch tongue (4), a button (3), a first reset member (5) and a second reset member (6); the latch tongue (4) can be latched on the latching side when the upper cover (2) is closed; the button (3) is slidably installed in the installation chamber (11) along a first direction; the latch tongue (4) is slidably installed in the installation chamber (11) along a second direction perpendicular to the first direction; when the button (3) is pressed, it can overcome the elastic force of the second reset member (6) and drive the latch tongue (4) to overcome the elastic force of the first reset member (5) and move, so as to release the latch tongue (4) from being latched on the latching side; The latch tongue (4) is provided with a through fitting hole (41), the bottom end of the button (3) is provided with a stopper (34) passing through the fitting hole (41), a limiting structure is provided between the stopper (34) and the latch tongue (4), and the stopper (34) can be engaged with the limiting structure when the button (3) is reset; wherein the first direction is the opening direction of the mounting opening (12).

2. The flap structure for a ventilator according to claim 1, It is characterized in that The button (3) comprises a push rod (32) and a pressing plate (31) connected to the top end of the push rod (32); the push rod (32) is inserted into the matching hole (41); and the stopper (34) is formed on the push rod (32).

3. The flap structure for a ventilator according to claim 2, It is characterized in that The push rod (32) is formed with a stop step protruding radially outward, and the stop step constitutes the stop portion (34).

4. The flap structure for a ventilator according to claim 3, It is characterized in that The limiting structure comprises two limiting plates (13) extending horizontally along the second direction and spaced apart, the two limiting plates (13) being fixed on the mounting bin (11), the push rod (32) passing through the space formed between the two limiting plates (13), the bottom surface of the limiting plate (13) being able to cooperate with the stopping step, and the top surface of the limiting plate (13) supporting the latching tongue (4).

5. The flap structure for a ventilator according to claim 4, It is characterized in that The bottom end of the push rod (32) is provided with a guide hole which opens in a direction away from the pressing plate (31), and the top end of the second reset member (6) is inserted into the guide hole.

6. The flap structure for a ventilator according to claim 1, It is characterized in that A card slot (21) is provided on the card connection side of the upper cover (2), and an end of the card tongue (4) has a card hook (44) extending out of the installation compartment (11) along the second direction, and the card hook (44) can be locked in the card slot (21) when the upper cover (2) is closed.

7. The flap structure for a ventilator according to any one of claims 1 to 6, It is characterized in that The locking structure also includes a fixing seat (7), and a side of the installation bin (11) away from the engaging position of the latch tongue (4) and the engaging side is an open structure. The fixing seat (7) includes a first fixing plate (71), an extending arm (72) and a second fixing plate (73). The first fixing plate (71) and the second fixing plate (73) are arranged in parallel and spaced apart along the second direction. The extending arm (72) extends along the second direction and connects the first fixing plate (71) and the second fixing plate (73). The first fixing plate (71) is fixed to the opening side of the installation bin (11), and an end of the first reset member (5) away from the latch tongue (4) is fixed to the second fixing plate (73).

8. The flip cover structure for a ventilator according to claim 7, It is characterized in that The first fixing plate (71) is provided with a guide groove (74) penetrating along the second direction, the longitudinal cross-sectional shape of the guide groove (74) is the same as the longitudinal cross-sectional shape of the latch tongue (4), and the latch tongue (4) can be guided and moved in the guide groove (74).

9. The flap structure for a ventilator according to any one of claims 1 to 6, It is characterized in that The latch tongue (4) is provided with a guide structure (42) extending along the second direction, and the first reset member (5) is sleeved and matched with the guide structure (42) to guide the first reset member (5).

10. The flap structure for a ventilator according to any one of claims 1 to 6, It is characterized in that A notch (35) is provided on the outer wall of the button (3), and a side wall of the notch (35) away from the stop portion (34) is inclined in a direction away from the stop portion (34) to form a first inclined surface (33); an opening of the matching hole (41) away from the stop portion (34) is provided with an inner chamfer to form a second inclined surface (43), and the first inclined surface (33) can drive the latching tongue (4) to release the latching connection with the latching side through the second inclined surface (43) when the button (3) is pressed.

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