Lockset with secondary protection function and air conditioning unit

Abstract

The utility model relates to a lock with secondary protection function and an air conditioning unit, the lock comprises a lock body, a first spring bolt and a second spring bolt, one end of the first spring bolt and one end of the second spring bolt are respectively connected to the lock body, and an included angle is formed between the first spring bolt and the second spring bolt. When torsion is applied to the lock body, the first spring bolt and the second spring bolt are driven to rotate at the same time, so that the first spring bolt is switched between a locking state and an opening state, and the second spring bolt is switched between a secondary protection opening state and a secondary protection unlocking state. According to the utility model, two functions of automatic locking and secondary protection can be realized at the same time, missed operation and misoperation can be effectively avoided, and safe and reliable use is ensured.

Description

Technical Field

[0001] The utility model relates to the field of lock technology, in particular to a lock with secondary protection function and an air-conditioning unit. Background Art

[0002] Urban rail vehicles typically have two air conditioning units per passenger compartment. These units typically utilize a modular design and are mounted on the roof of the vehicle. The units consist of a housing housing the evaporator, evaporator fan, electric heater, condenser, condenser fan, compressor, and other components. To facilitate routine maintenance, a retractable cover is typically installed on the top panel of the housing. Due to the high speeds and complex operating environments of rail vehicles, the cover must remain secure and reliable throughout operation to prevent potential hazards.

[0003] Currently, a secondary protection device is provided between the top cover and the shell of the air-conditioning unit. When the fixing method between the top cover and the shell fails or is removed, the device can temporarily tighten and protect the top cover.

[0004] Conventional secondary protection methods for the top cover of air conditioner units mainly include the use of hooks and latches, but the currently used protection structures each have different disadvantages, as follows:

[0005] The hook method takes up a large amount of space inside the air conditioner. The top cover needs to be opened to a certain angle, and then the operator needs to reach into the bottom of the top cover to touch the hook handle before the operation can be carried out. The handle is located deep and cannot be seen. It is very difficult for maintenance personnel with a fat body to reach out and operate. At the same time, the hook method also has requirements for the installation direction. The handle must be set near the edge of the top cover to operate. Although the structure is simple, the operation is relatively difficult.

[0006] The latch method requires manual operation and is prone to operator omissions. In addition, the overlap size is small, which makes it easy for the latch to fail or cause scratching and interference when opening. It occupies a large space on the side panels of the beam, compresses the maintenance space of the top cover, and affects the maintenance of internal components. Utility Model Content

[0007] The main technical problem solved by the utility model is to provide a lock with a simple structure, low cost, and the ability to simultaneously realize automatic locking and secondary protection functions to ensure safe and reliable use, and at the same time provide an air-conditioning unit using the lock.

[0008] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0009] A lock with a secondary protection function includes a lock body, a first lock tongue and a second lock tongue, one end of the first lock tongue and the second lock tongue are respectively connected to the lock body, and an angle is formed between the first lock tongue and the second lock tongue. When a torsional force is applied to the lock body, the first lock tongue and the second lock tongue are driven to rotate simultaneously, so that the first lock tongue is switched between a locked state and an open state, and the second lock tongue is switched between a secondary protection state and a secondary protection unlocked state.

[0010] Furthermore, a connection point between the first lock tongue and the lock body and a connection point between the second lock tongue and the lock body are located at different heights of the lock body.

[0011] Furthermore, the angle between the first lock tongue and the second lock tongue is 90°.

[0012] Furthermore, the lock body includes a lock shell, a locking device and a lock core, the locking device includes a sleeve, the central axis of the lock core is placed in the sleeve, the periphery of the sleeve is provided with a spiral groove, and a limiting shaft protruding outward is provided on the central axis of the lock core, the limiting shaft is inserted into the spiral groove, and the spiral groove has three sections, which are, from top to bottom, an unlocking section, an inclined section and a horizontal sliding section, and the unlocking section is formed by the top of the inclined section bending downward.

[0013] Furthermore, the second lock tongue consists of a fixed lock tongue and a movable lock tongue. One end of the fixed lock tongue is fixedly connected to the lock body, and the other end of the fixed lock tongue is rotatably connected to the movable lock tongue through a one-way rotation structure. The one-way rotation structure is configured to enable the movable lock tongue to rotate upward in one direction from an initial position under the action of a shell limit member and return to the initial position after passing the shell limit member.

[0014] Furthermore, the one-way rotation structure includes a rotating shaft and a limiting structure arranged between the movable lock tongue and the fixed lock tongue for limiting the initial position of the movable lock tongue.

[0015] Furthermore, the limiting structure is a protruding portion extending from the end surface of the movable lock tongue toward the fixed lock tongue. In the initial position, the end surface of the protruding portion of the movable lock tongue is in contact with the end surface of the fixed lock tongue.

[0016] Furthermore, the one-way rotation structure also includes a reset spring installed between the fixed lock tongue and the movable lock tongue. During the one-way rotation process, the reset spring is compressed, and after rotating into place, the movable lock tongue automatically resets to its initial position.

[0017] Furthermore, an upwardly bent limiting portion is provided at the outer end portion of the movable locking tongue, and after being rotated into position, the housing limiting member is confined within the limiting portion.

[0018] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0019] An air-conditioning unit comprises a shell and a cover plate, wherein the cover plate is fixed to the shell by a lock. The lock is the lock with a secondary protection function as described above.

[0020] In summary, the lock and air conditioner unit with secondary protection function provided by the present invention have the following advantages over the prior art:

[0021] (1) The utility model can realize the two functions of automatic locking and secondary protection at the same time, and can effectively avoid missed operation and wrong operation, and ensure safe and reliable use.

[0022] (2) The utility model has a simple structure, is easy to operate, has a compact size, and is low in cost. Moreover, the size of the utility model is similar to that of conventional tension locks on the market, and it does not occupy internal space. It is suitable for air-conditioning units with high space requirements and is convenient for the layout of internal components.

[0023] The specific implementation of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0025] In the attached figure:

[0026] Figure 1 This is a schematic diagram of the structure of the utility model lock;

[0027] Figure 2 This is a schematic diagram of the structure of the utility model lock (without the lock shell);

[0028] Figure 3 yes Figure 2 lateral view of;

[0029] Figure 4 This is a schematic diagram of the structure of the movable lock tongue of the utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the utility model lock in the locked state;

[0031] Figure 6 This is a schematic diagram of the structure of the utility model lock in the secondary protection state;

[0032] Figure 7This is a schematic diagram of the structure of the utility model lock in a fully open state;

[0033] Figure 8 It is a structural schematic diagram of the lock of the utility model in the state of the cover closing process.

[0034] In the picture:

[0035] Limiting member 1, lock body 2, lock housing 21, locking device 22, sleeve 221, spiral slide 222, unlocking section 2221, inclined section 2222, transverse sliding section 2223, limiting shaft 223, spring 224, lock cylinder 23, key block 231, sealing portion 232, central shaft 233, mounting hole 24;

[0036] First lock tongue 3;

[0037] Second lock tongue 4, fixed lock tongue 41, movable lock tongue 42, limiting portion 421, one-way rotation structure 43; rotating shaft 431, limiting structure 432, extending portion 4321, return spring 433;

[0038] Handle 5.

[0039] It should be noted that the drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0042] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0043] like Figures 1 to 3 As shown, the utility model provides a lock with a secondary protection function, which is installed on an air-conditioning unit. The air-conditioning unit includes a shell and a cover plate (not shown in the figure). One side of the cover plate is rotatably connected to the shell by a hinge, and the other side of the cover plate is locked by the lock. A limit member 1 is also provided on the shell. The limit member 1 is a limit plate or a limit rod fixed to the shell of the air-conditioning unit. In this embodiment, the limit member 1 is preferably a limit rod. The cover plate and the limit member 1 on the shell are connected and matched by the lock to realize the locking function of the air-conditioning unit cover plate. At the same time, it can also play a secondary protection role of temporarily tightening the cover plate when the lock fails or the cover plate does not need to be fully opened.

[0044] like Figures 1 to 3 As shown, the lock with a secondary protection function provided in this embodiment includes a lock body 2, a first lock tongue 3 and a second lock tongue 4. One end of the first lock tongue 3 and the second lock tongue 4 are respectively connected to the lock body 2, and there is an angle between the first lock tongue 3 and the second lock tongue 4 (not marked in the figure). Among them, the first lock tongue 3 is used to realize the locking function of the lock, and the second lock tongue 4 is used to realize the secondary protection function. When a torque is applied to the lock body 2, the first lock tongue 3 and the second lock tongue 4 are driven to rotate simultaneously, so that the first lock tongue 3 and the limit member 1 cooperate to switch between the locked state and the open state, and the second lock tongue 4 and the limit member 1 cooperate to switch between the secondary protection state and the secondary protection unlocked state.

[0045] In order to prevent the first lock tongue 3 and the second lock tongue 4 from competing with each other when cooperating with the limit member 1 to achieve the working state conversion, it is further preferred in this embodiment that the angle between the first lock tongue 3 and the second lock tongue 4 is 90°, and more preferably the first lock tongue 3 is located in the direction of 90° clockwise rotation of the second lock tongue 4.

[0046] In this embodiment, the connection point between the first lock tongue 3 and the lock body 2 and the connection point between the second lock tongue 4 and the lock body 2 are located at different heights of the lock body 2. More preferably, the connection point between the first lock tongue 3 and the lock body 2 is located above the connection point between the second lock tongue 4 and the lock body 2.

[0047] In this embodiment, the structure of the lock body 2 can adopt the structure of a tension lock in the prior art, specifically including a lock housing 21, a locking device 22, and a lock core 23. The lock housing 21 is provided with a mounting hole 24, in which the lock core 23 is mounted. The first and second lock tongues 3 and 4 are arranged at the bottom of the lock body 2 and extend to one side from the lock body 2. The locking device 22 is arranged between the lock core 23 and the first and second lock tongues 3 and 4. By operating the locking device 22, the first and second lock tongues 3 and 4 are rotated simultaneously.

[0048] The top of the lock cylinder 23 has a key block 231, which is connected to a sealing portion 232 and a central shaft 233. The sealing portion 232 includes multiple sealing grooves and sealing rings (not shown) installed within the sealing grooves. The sealing ring cooperates with the lock housing 21 to seal the lock, preventing dust and rainwater from entering the lock housing 21 through the top of the lock housing 21, thus providing a waterproof seal. To facilitate the application of torque to the key block 231, a handle 5 for the operator to grasp is preferably installed above the key block 231.

[0049] In this embodiment, the locking device 22 includes a sleeve 221, the central axis 233 of the lock core 23 is placed in the sleeve 221, a spiral groove 222 is provided on the periphery of the sleeve 221, and a limiting shaft 223 protruding outward is provided on the central axis 233 of the lock core 23, the end of the limiting shaft 223 is inserted into the spiral groove 222, and the spiral groove 222 limits the movement trajectory of the limiting shaft 223 when it rotates with the key block 231.

[0050] A spring 224 is provided in the sleeve 221, one end of the spring 224 rests against the bottom end of the central shaft 233, and the other end of the spring 224 is connected to the bottom of the sleeve 221. A mounting block (not shown in the figure) is provided at one end of the sleeve 221 corresponding to the first lock tongue 3 and the second lock tongue 4. One end of the first lock tongue 3 and the second lock tongue 4 are both sleeved on the mounting block and fixedly connected to the mounting block by bolts.

[0051] In this embodiment, preferably, the spiral chute 222 has three sections, namely, an unlocking section 2221, an inclined section 2222, and a transverse sliding section 2223, from top to bottom. The unlocking section 2221 is formed by the top of the inclined section 2222 being slightly bent downward. When the limiting shaft 223 is stuck in the unlocking section 2221, it can prevent it from falling out of the unlocking end. The transverse sliding section 2223 is longer and serves as the locking end. When the limiting shaft 223 is placed at the locking end of the inclined section 2222 (i.e., the bottom end of the inclined section 2222), it will continue to move along the transverse sliding section 2223. The length of the transverse sliding section 2223 must ensure that the first lock tongue 3 and the second lock tongue 4 can continue to rotate 90°. The inclination angle of the inclined section 2222 limits the distance that the first lock tongue 3 and the second lock tongue 4 can move in the axial direction and the angle of 90° rotation in the horizontal direction.

[0052] When the lock core 23 is in the locked and tensioned state, the lock core 23 rotates, driving the limiting shaft 223 from the unlocking section 2221 downward along the inclined section 2222 and into the transverse sliding section 2223. When the lock core 23 is in the unlocking state, the lock core 23 rotates, driving the limiting shaft 223 from the transverse sliding section 2223 upward along the inclined section 2222 and into the unlocking section 2221, where it remains unchanged.

[0053] The operator cooperates with the handle 5 and the key block 231 to apply torque to the key block 231, driving the limit shaft 223 to slide in the spiral groove 222 and switch between the unlocking end and the locking end, thereby driving the first lock tongue 3 and the second lock tongue 4 at the bottom to switch between different working states.

[0054] like Figures 1 to 3 As shown, in this embodiment, the second lock tongue 4 consists of a fixed lock tongue 41 and a movable lock tongue 42. One end of the fixed lock tongue 41 is fixedly connected to the mounting block in the locking device 22, and the other end of the fixed lock tongue 41 is rotatably connected to the movable lock tongue 42 via a one-way rotation structure 43. The one-way rotation structure 43 is configured so that the movable lock tongue 42 can only rotate upward from its initial position (i.e., rotate in a direction away from the engagement) under the action of the housing stopper 1 and return to its initial position after passing the housing stopper 1, but cannot rotate downward from its initial position. In this initial position, the main body 42a of the movable lock tongue 42 and the fixed lock tongue 41 are on the same horizontal plane.

[0055] As the cover is buckled downward, the movable lock tongue 42, under the action of the housing stopper 1, rotates upward from its initial position until it passes over the housing stopper 1. After passing over, it returns to its initial position and is positioned below the housing stopper 1, where it is restrained below the housing stopper 1. Because the movable lock tongue 42 cannot rotate downward from its initial position, if the cover is subjected to an upward force at this time, the movable lock tongue 42 will be stuck below the housing stopper 1, preventing the cover from opening, thereby achieving the cover's secondary protection function. Only when the operator manually operates the locking device 22 and rotates the second lock tongue 4 to the secondary protection unlocked state can the second lock tongue 4 be disengaged from the housing stopper 1, releasing the secondary protection state.

[0056] In this embodiment, the one-way rotation structure 43 preferably includes a rotating shaft 431 and a limiting structure 432 disposed between the movable lock tongue 42 and the fixed lock tongue 41 for limiting the initial position of the movable lock tongue 42. The one-way rotation structure 43 allows the movable lock tongue 42 to rotate under force to avoid the housing limiter 1 when the lock is naturally lowered (i.e., the cover is buckled downward). When the lock is lifted, the limiting effect is achieved, preventing the movable lock tongue 42 from rotating in the opposite direction, thereby preventing the cover from being opened.

[0057] like Figure 4As shown, in this embodiment, it is further preferred that the limiting structure 432 is a protrusion 4321 extending from the end surface of the movable lock tongue 42 toward the fixed lock tongue 41. In the initial position, the end surface of the protrusion 4321 of the movable lock tongue 42 abuts against the end surface of the fixed lock tongue 41. This prevents the movable lock tongue 42 from further rotating downward, preventing the movable lock tongue 42 from excessively rotating and causing the movable lock tongue 42 to escape from the restriction between the housing limiter 1.

[0058] In this embodiment, the one-way rotation structure 43 further includes a return spring 433 mounted between the fixed lock tongue 41 and the movable lock tongue 42. More preferably, the return spring 433 is a torsion spring mounted on the rotating shaft 431. The rotating shaft 431 and the return spring 433 are both mounted on the upper surfaces of the movable lock tongue 42 and the fixed lock tongue 41. The ends of the return spring 433 are respectively connected to the upper surfaces of the movable lock tongue 42 and the fixed lock tongue 41. The return spring 433 is compressed during the closing process of the cover. After the cover is closed, the return spring 433 returns the movable lock tongue 42 to its initial position under the action of the return spring 433.

[0059] In this embodiment, preferably, the outer end of the movable lock tongue 42 is provided with a limit portion 421 that is bent upward (i.e., in the direction of rotation), and further preferably, the limit portion 421 is integrally formed by the upwardly inclined edge of the main body 42a of the movable lock tongue 42. After the cover is buckled into place, the housing limit member 1 is confined within the limit portion 421. The limit portion 421 adopts a structure formed by the main body 42a of the movable lock tongue 42 being bent outward, which not only serves to limit the housing limit member 1, but also helps to reduce the rotation angle of the movable lock tongue 42 over the housing limit member 1, allowing the movable lock tongue 42 to quickly cross the housing limit member 1 within the travel range of the cover buckling to achieve locking.

[0060] In this embodiment, it is further preferred that the inclination angle of the limiting portion 421 relative to the main body 42a of the movable locking tongue 42 is 100-170°, and even more preferably, the inclination angle of the limiting portion 421 relative to the main body 42a is 135°.

[0061] The lock with secondary protection function provided by the utility model has the following operation process when locked:

[0062] like Figure 5 As shown, it is a locked state. In this state, the first lock tongue 3 overlaps with the limit member 1 (that is, the first lock tongue 3 is perpendicular to the limit member 1), which is consistent with the locking principle of the conventional tension lock. The limit shaft 223 is clamped in the unlocking section 2221 at the top of the spiral slide groove 222, and the first lock tongue 3 is restricted in the locked state by clamping the spiral slide groove 222. In this state, the return spring 433 in the second lock tongue 4 is not subjected to force, the second lock tongue 4 does not work, and the second lock tongue 4 remains on the side parallel to the limit member 1.

[0063] like Figure 6 As shown, this is the secondary protection state. In this state, based on the above-mentioned locked state, a torque is applied to the handle 5 to slide the limit shaft 223 out of the unlocking section 2221 of the spiral slide 222, and under the action of the internal hidden spring 224, it is rotated to the position of the horizontal sliding section 2223 at the bottom of the spiral slide 222. At this time, the second lock tongue 4 is acted upon by the spring 224, and the limit shaft 223 is located at the rightmost end of the horizontal sliding section 2223 (the end connected to the inclined section 2222). During this process, the first lock tongue 3 and the second lock tongue 4 rotate synchronously by 90° and move downward in the axial direction for a certain distance. In this state, the first lock tongue 3 does not work, and the first lock tongue 3 remains on the side parallel to the limit member 1. The second lock tongue 4 is perpendicular to the limit member 1 and is placed below the limit member 1. At this time, if the cover is lifted upward again, the movable lock tongue 42 cannot rotate downward in the opposite direction under the action of the limit structure 432, ensuring that the movable lock tongue 42 remains in the horizontal state of the initial position, and the movable lock tongue 42 cannot pass through the shell limit member 1 again, and the cover cannot be fully opened, thereby playing a secondary protection role.

[0064] like Figure 7 As shown, it is a fully open state. In this state, it is necessary to continue to apply torque to the handle 5. The limit shaft 223 slides from the rightmost end of the horizontal sliding section 2223 to the leftmost section of the horizontal sliding section 2223. At this time, the first lock tongue 3 and the second lock tongue 4 continue to rotate 90° to prevent the limit member 1 from being in an inoperative state. In this state, the spring 224 is stressed, and the top cover can be opened normally. Once the torque is stopped on the handle 5, the tension lock will return to the state as shown in the figure below under the action of the spring 224. Figure 5 Secondary protection status shown.

[0065] like Figure 8 As shown in the figure, it is the state of the cover closing process. When the cover is buckled downward, the lock moves downward together with it. In this state, the movable lock tongue 42 contacts the limit member 1 during the falling process of the second lock tongue 4. The movable lock tongue 42 is supported from bottom to top by the housing limit member 8. The movable lock tongue 42 is in a state of being forced to rotate upward. The return spring 433 is stressed. After the movable lock tongue 42 rotates, it bypasses the limit member 1 and is placed under the housing limit member 8. Under the action of the return spring 433, the movable lock tongue 42 is flattened and returns to the position shown in the figure. Figure 5 The secondary protection state shown can be restored by applying a torque to the handle 5 in the opposite direction and then tightening the lock. Figure 4 At this time, if the lock is lifted upward (i.e., the cover is opened upward), the movable lock tongue 42 cannot rotate downward due to the action of the limiting structure 432, ensuring that the movable lock tongue 42 remains in the horizontal state at the initial position and cannot pass through the housing limiter 1 again, thereby achieving secondary protection of the cover.

[0066] The beneficial effects of adopting the above technical solution are:

[0067] 1. It can realize the two functions of automatic locking and secondary protection at the same time, effectively avoid missed operation and misoperation, and ensure safe and reliable use.

[0068] 2. It has simple structure, easy operation, compact size, low cost, and is similar in size to conventional tension locks on the market. It does not occupy internal space and is suitable for air-conditioning units with high space requirements, facilitating the layout of internal components.

[0069] 3. The lock has a flexible position in the rail air-conditioning unit and is not affected by the installation direction. The installation position can be flexibly adjusted according to the internal layout of the air-conditioning unit.

[0070] 4. All operating parts of the lock are visible, which is convenient for staff to operate manually without groping. The operation is more humane, safer and more reliable.

[0071] 5. The lock can be locked automatically without manual intervention. It needs manual operation to open. It has high security and greatly reduces the risk of misoperation and missed operation. It is safe and reliable to use.

[0072] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments with equivalent changes using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A lock with a secondary protection function, characterized in that: The utility model comprises a lock body, a first lock tongue and a second lock tongue, wherein one end of the first lock tongue and the second lock tongue are respectively connected to the lock body, and an angle is formed between the first lock tongue and the second lock tongue. When a torque is applied to the lock body, the first lock tongue and the second lock tongue are driven to rotate simultaneously, so that the first lock tongue is switched between a locked state and an open state, and the second lock tongue is switched between a secondary protection state and a secondary protection unlocked state.

2. The lock with secondary protection function according to claim 1, characterized in that: The connection point between the first lock tongue and the lock body and the connection point between the second lock tongue and the lock body are located at different heights of the lock body.

3. The lock with secondary protection function according to claim 1, characterized in that: The included angle between the first locking tongue and the second locking tongue is 90°.

4. The lock with secondary protection function according to claim 1, characterized in that: The lock body includes a lock shell, a locking device and a lock core. The locking device includes a sleeve. The central axis of the lock core is placed in the sleeve. A spiral groove is provided on the periphery of the sleeve. A limiting shaft protruding outward is provided on the central axis of the lock core. The limiting shaft is inserted into the spiral groove. The spiral groove has three sections, which are, from top to bottom, an unlocking section, an inclined section and a horizontal sliding section. The unlocking section is formed by the top of the inclined section bending downward.

5. The lock with secondary protection function according to any one of claims 1 to 4, characterized in that: The second lock tongue consists of a fixed lock tongue and a movable lock tongue. One end of the fixed lock tongue is fixedly connected to the lock body, and the other end of the fixed lock tongue is rotatably connected to the movable lock tongue through a one-way rotation structure. The one-way rotation structure is configured to enable the movable lock tongue to rotate upward in one direction from an initial position under the action of a shell limit member and return to the initial position after passing the shell limit member.

6. The lock with secondary protection function according to claim 5, characterized in that: The one-way rotation structure includes a rotating shaft and a limiting structure arranged between the movable lock tongue and the fixed lock tongue for limiting the initial position of the movable lock tongue.

7. The lock with secondary protection function according to claim 6, characterized in that: The limiting structure is a protruding portion extending from the end surface of the movable lock tongue toward the fixed lock tongue. In the initial position, the end surface of the protruding portion of the movable lock tongue abuts against the end surface of the fixed lock tongue.

8. The lock with secondary protection function according to claim 6, characterized in that: The one-way rotation structure also includes a return spring installed between the fixed lock tongue and the movable lock tongue. The return spring is compressed during the one-way rotation process, and the movable lock tongue is automatically returned to its initial position after being rotated into place.

9. The lock with secondary protection function according to claim 5, characterized in that: An upwardly bent limiting portion is provided at the outer end portion of the movable locking tongue. After being rotated into position, the housing limiting member is confined within the limiting portion.

10. An air conditioning unit comprising a housing and a cover plate, wherein the cover plate is fixed to the housing by a lock, characterized in that: The lock is a lock with a secondary protection function as described in any one of claims 1 to 9.

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