Key unit and fire fighting device

Abstract

The utility model provides a button unit and a fire-fighting device, the button unit comprises a circuit board, a light-emitting element, a switch and an outer cover, and the light-emitting element is arranged on the circuit board and is electrically connected with the circuit board. The switch is arranged on the circuit board, electrically connected with the circuit board and arranged in the circumferential direction of the light-emitting element in a surrounding mode. The outer cover comprises a connecting part, a trigger part, a deformation part and a contact part, and the connecting part is attached to the circuit board and surrounds the circumferential outer side of the switch. And the trigger part is positioned above the switch. The deformation part is located between the connecting part and the triggering part and can elastically deform so that the triggering part can be close to or away from the switch. The contact part is located above the light-emitting element, and at least part of the contact part is of a transparent structure. According to the embodiment of the utility model, the key unit is simple in structure, the light-emitting element is surrounded by the outer cover, light leakage can be reduced, sealing and dust prevention are facilitated, the working performance is stable, the service life is long, and the key unit is suitable for being applied to fire fighting devices.

Description

Technical Field

[0001] The utility model generally relates to the technical field of fire fighting equipment, in particular to a key unit and a fire fighting device. Background Art

[0002] Illuminated keys can not only improve the user's visual experience, but also indicate the position of the keys in an environment with poor brightness, which is conducive to the user's quick identification and use. Existing luminous keys mainly include two implementation methods, one of which is to set a light source between the keycap and the circuit board, such as a backlit keyboard, and the other is to form a self-luminous coating on the keycap.

[0003] However, both of the above methods have defects and are difficult to be directly applied in fire-fighting equipment. The structure of the luminous key with a light source is complex, so a longer key travel is required to provide space for the key structure. However, increasing the key travel is likely to cause light leakage, affecting the visual clarity of the luminous key, and the dust and deformation resistance are poor, so it is not suitable for use in fire-fighting equipment under harsh working conditions. The key structure with a self-luminous coating is relatively simple, but the stability of the self-luminous coating is poor, the service life is short, and the self-luminous coating is limited by the material, the brightness is low, and the visual effect is not obvious.

[0004] The contents of the background technology section are merely the technologies known to the inventors and do not necessarily represent the prior art in the field. Utility Model Content

[0005] In view of one or more defects in the prior art, the utility model provides a key unit, comprising:

[0006] Circuit boards;

[0007] A light emitting element, wherein the light emitting element is disposed on the circuit board and is electrically connected to the circuit board;

[0008] A switch, the switch is disposed on the circuit board and electrically connected to the circuit board, and the switch is disposed around the circumference of the light emitting element; and

[0009] An outer cover, the outer cover comprising:

[0010] A connecting portion, the connecting portion is attached to the circuit board, and the position where the connecting portion and the circuit board are attached is located around the circumferential outer side of the switch;

[0011] A trigger portion, the trigger portion being located above the switch;

[0012] a deformation portion, the deformation portion being located between the connecting portion and the trigger portion and being configured to be elastically deformable so as to make the trigger portion approach or move away from the switch; and

[0013] A contact portion is located above the light emitting element and at least part of the contact portion is a transparent structure.

[0014] According to one aspect of the utility model, a first cavity is provided between the outer cover and the circuit board, the trigger portion is suspended above the switch, and the first cavity is located between the trigger portion and the switch.

[0015] According to one aspect of the utility model, after the outer cover is compressed, the trigger portion approaches the switch, and the deformation portion undergoes elastic deformation to obtain elastic potential energy.

[0016] According to one aspect of the utility model, a second cavity is further provided between the outer cover and the circuit board, and the outer cover further comprises a side wall, wherein the side wall is located between the trigger portion and the contact portion, and the side wall circumferentially surrounds the second cavity.

[0017] According to one aspect of the present invention, the first cavity is communicated with the second cavity.

[0018] According to one aspect of the utility model, a step structure is provided between the side wall and the contact portion, and the circumferential dimension of the side wall is larger than the circumferential dimension of the contact portion.

[0019] According to one aspect of the utility model, the contact portion comprises:

[0020] a light incident surface, the light incident surface facing the light emitting element; and

[0021] A light emitting surface, the light emitting surface faces a side opposite to the light incident surface, and the surface of the light emitting surface has a transparent area of ​​a preset shape.

[0022] According to one aspect of the utility model, the outer cover is integrally formed, and the outer cover also includes a positioning portion, which is arranged on a side of the outer cover facing the circuit board, and a positioning hole matching the positioning portion is arranged on the circuit board, and the positioning portion is embedded in the positioning hole.

[0023] According to one aspect of the utility model, the connecting portion and the circuit board are bonded and fixed.

[0024] According to one aspect of the utility model, the stroke of the switch is no greater than 2 mm.

[0025] According to one aspect of the utility model, the utility model also includes a fire fighting device, the fire fighting device comprising:

[0026] shell;

[0027] At least one key unit as described above, wherein the circuit board in the key unit is arranged on one side of the housing, and the contact portion in the key unit extends to the other side of the housing.

[0028] According to one aspect of the utility model, the outer cover also includes a side wall, a step structure is provided between the side wall and the contact portion, and the shell is clamped at the step structure; the height of the contact portion extending to one side of the shell is greater than the stroke of the switch in the button unit.

[0029] According to one aspect of the utility model, the fire fighting device comprises a plurality of the button units, the plurality of the button units share one circuit board, and the outer covers of the plurality of the button units are integrally formed.

[0030] Compared with the prior art, the embodiment of the utility model provides a key unit, in which the light-emitting element and the switch are both enclosed within the range of the outer cover, and the on-off state of the switch is changed by the cooperation of the trigger part and the deformation part in the outer cover, thereby simplifying the structure of the key unit. The key unit in this embodiment has a simple structure, and the light-emitting element is surrounded by the outer cover, which can reduce light leakage, is conducive to sealing and dustproofing, and has stable working performance and prolonged service life, and is suitable for use in fire-fighting equipment. The utility model also includes an embodiment of a fire-fighting device, which uses the aforementioned key unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 is a cross-sectional view of a key unit in some embodiments of the utility model;

[0033] Figure 2 is a cross-sectional view of a key unit including a first cavity in some embodiments of the utility model;

[0034] Figure 3 is a cross-sectional view of a key unit including a side wall in some embodiments of the utility model;

[0035] Figure 4 is a top view of a key unit in some embodiments of the utility model;

[0036] Figure 5 is a cross-sectional view of a key unit including a positioning portion in some embodiments of the utility model;

[0037] Figure 6 is a cross-sectional view of a fire fighting device in some embodiments of the utility model;

[0038] Figure 7 It is a top view of the fire fighting device in some embodiments of the present utility model. DETAILED DESCRIPTION

[0039] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0040] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0041] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0044] The following describes embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0045] Figure 1 The specific structure of the key unit 100 in some embodiments of the present utility model is shown below. Figure 1 The key unit 100 will be described.

[0046] like Figure 1 As shown, the key unit 100 includes a circuit board 110, a light emitting element 120, a switch 130 and an outer cover 140, wherein the circuit board 110 may be provided with a circuit preset according to actual usage requirements to achieve specific functions.

[0047] The light emitting element 120 is disposed on the circuit board 110 and is electrically connected to the circuit board 110. In some embodiments of the present invention, the light emitting element 120 may be partially or completely embedded in the circuit board 110 to avoid the situation where the switch 130 is not triggered sensitively due to the obstruction of the movement of the outer cover 140. Specifically, a countersunk hole or a through hole may be opened in the circuit board 110, and the light emitting element 120 may be installed in the countersunk hole or the through hole.

[0048] The light emitting element 120 may specifically include a light emitting diode and a control circuit of the light emitting diode, and is electrically connected to the circuit board 110, and can be powered by the circuit board 110. In different embodiments of the present invention, the light emitting element 120 may be set to be always on, or to be controllably lit and extinguished, for example, the lighting and extinguishing of the light emitting element 120 are associated with the switching state of the switch 130, when the switch 130 is closed, the light emitting element 120 may be set to be lit, and when the switch 130 is disconnected, the light emitting element 120 may be set to be extinguished.

[0049] The switch 130 is disposed on the circuit board 110 and is electrically connected to the circuit board 110. The switch 130 is configured to switch between switch states (closed state and open state) and cooperate with the circuit board 110 to realize different functions, such as starting a device, cutting off power, switching or isolating a device, etc. Specifically, the switch 130 includes an elastic sheet made of metal, which is triggered when pressed and rebounds after the pressure is removed, or is triggered when pressed and rebounds when pressed again.

[0050] The switch 130 is disposed around the circumference of the light emitting element 120. Preferably, the switch 130 is substantially disposed in a ring shape, surrounding the circumference of the light emitting element 120, for example, the light emitting element 120 is disposed at the center of the ring. The switch 130 may also be disposed in an open shape, for example, the switch 130 includes a plurality of conductive structures disposed at intervals, uniformly disposed around the circumference of the light emitting element 120.

[0051] The outer cover 140 is arranged outside the light emitting element 120 and the switch 130. Preferably, the outer cover 140 is arranged to cooperate with the circuit board 110 to seal the light emitting element 120 and the switch 130. In this embodiment, the outer cover 140 includes a connecting portion 141, a triggering portion 142, a deforming portion 143 and a contact portion 144. According to a preferred embodiment of the utility model, the connecting portion 141, the triggering portion 142, the deforming portion 143 and the contact portion 144 in the outer cover 140 can be integrally formed. For example, the outer cover 140 is made of silicone and is formed by a solid-state hot pressing process.

[0052] The connection portion 141 is attached to the circuit board 110, and the position where the connection portion 141 and the circuit board 110 are attached surrounds the circumferential outer side of the switch 130. The connection portion 141 can be connected to the circuit board 110 in a variety of ways, such as adhesive fixation, snap fixation, vacuum adsorption, etc., which are not specifically limited. In this embodiment, the connection portion 141 can completely cover the switch 130 and the light-emitting element 120, can protect the switch 130 and the light-emitting element 120, and when part of the structure in the outer cover 140 is set to be opaque, it can also prevent light leakage.

[0053] The trigger portion 142 is located above the switch 130, specifically, it can be directly above or obliquely above, where the above means Figure 1The up and down directions shown in . Figure 1 As shown in , the trigger part 142 can be arranged to be close to or attached to the switch 130, and the switch 130 can be arranged to change the switch state under pressure, for example, by applying a slight pressure to the switch 130 through the trigger part 142, the switch state of the switch 130 can be changed. In other embodiments of the utility model, the trigger part 142 can also be suspended relative to the switch 130, which will be described in detail in the subsequent embodiments in conjunction with the drawings.

[0054] The deformation part 143 is located between the connecting part 141 and the trigger part 142, and the deformation part 143 is configured to be elastically deformable so as to make the trigger part 142 approach or move away from the switch 130. In different embodiments of the present invention, the deformation part 143 can be configured to generate elastic force by relying on the elasticity of the material structure itself, for example Figure 1 As shown in , the connecting portion 141, the deforming portion 143 and the triggering portion 142 are integrally formed, the cross-sectional size of the deforming portion 143 can be set to be slightly reduced, and has a suspended deformation space, when the outer cover 140 is pressurized, the deforming portion 143 undergoes elastic deformation, which can make the triggering portion 142 close to the switch 130, and when the pressure is removed, the deforming portion 143 restores the deformation, which can make the triggering portion 142 away from the switch 130. In different embodiments of the utility model, the deforming portion 143 can also be set in other forms, for example, the deforming portion 143 is set as an elastic member to provide elastic force.

[0055] The contact portion 144 is located above the light emitting element 120, and can be directly above or obliquely above, and the contact portion 144 is configured to be at least partially transparent. In this embodiment, the contact portion 144 can be used for contact by a user, for example, the contact portion 144 includes a pressing surface, and the contact portion 144 and the connecting portion 141, the deformable portion 143, and the trigger portion 144 are all integrally formed, and the user can control the switch state of the switch 130 by pressing the contact portion 144.

[0056] In different embodiments of the present invention, a conductive structure may be provided on the circuit board 110, and conductive particles may be provided on the outer cover 140, for example, they may be provided at one end of the trigger portion 142 facing the circuit board 110. When the outer cover 140 is pressed, the trigger portion 142 approaches the circuit board 110, and the conductive particles and the conductive structure cooperate with each other to change the switching state of the switch 130.

[0057] At least part of the contact portion 144 is a transparent structure. When the light emitting element 120 is lit, the light beam can pass through the transparent structure of the contact portion 144. This embodiment can control the emission position of the light beam emitted by the light emitting element 120, and the circumferential surrounding structure in this embodiment can effectively control light leakage and prevent the external environment from affecting the light emitting element 120 and the switch 130. At the same time, the structure of the deformation portion 143 in this embodiment is simple, which simplifies the mechanical structure of the key unit 100, is conducive to improving the service life, and reduces the production cost.

[0058] According to a preferred embodiment of the present utility model, Figure 2 As shown, there is a first cavity 145 between the outer cover 140 and the circuit board 110. The trigger part 142 is suspended above the switch 130, and the first cavity 145 is located between the trigger part 142 and the switch 130. The trigger part 142 in this embodiment is suspended relative to the switch 130, which can provide a larger travel for the key unit 130 and also prevent accidental touches. Figure 2 As shown, the deformation portion 143 can be arranged at an angle. When the contact portion 144 is pressed, the deformation portion 143 bends and deforms to obtain elastic potential energy, and the trigger portion 142 approaches the switch 130. When the pressure is removed, the deformation portion 143 returns to Figure 2 The contact portion 144 is reset. In this embodiment, the key unit 100 is triggered by pressing, and the outer cover 140 is reset by elastic deformation of the deformation portion 143, which is conducive to simplifying the structure of the key unit 100.

[0059] Preferably, the stroke of the switch 130 is set to be no greater than 2 mm, for example, 1.5 mm. Too large a stroke of the switch 130 may cause the structural stability of the key unit 100 to decrease, and a higher requirement on the structural strength of the deformation portion 143.

[0060] In a preferred embodiment of the present invention, Figure 3 As shown, there is a second cavity 146 between the outer cover 140 and the circuit board 110, and the outer cover 140 also includes a side wall 147, the side wall 147 is located between the trigger portion 142 and the contact portion 144, and the side wall 147 is arranged to surround the second cavity 146. In this embodiment, the provision of the side wall 147 can increase the overall height of the key unit 100, which is beneficial to expand the space between the circuit board 110 and the housing, which will be explained in detail in subsequent embodiments. On the other hand, in this embodiment, the provision of the side wall 147 and the second cavity 146 is also beneficial to match the divergence angle of the light-emitting element 120, so that the light beam emitted by the light-emitting element 120 can cover the transparent structure area in the contact portion 144. Preferably, the height of the side wall 147 can be selected according to the divergence angle of the light-emitting element 120.

[0061] Furthermore, the first cavity 145 and the second cavity 146 may be arranged to be interconnected. In this embodiment, the second cavity 146 can provide a space for the light emitting element 120. Figure 3 As shown, the light emitting element 120 can be arranged to protrude from the circuit board 110. In this embodiment, when the outer cover 140 is pressed, the contact portion 144 will not press the light emitting element. In addition, the first cavity 145 and the second cavity 146 can reduce the optical path of the light beam emitted by the light emitting element 120 in the structure of the outer cover 140, reduce the light beam energy absorbed by the structure of the outer cover 140, and help to improve the brightness of the light emitting area in the key unit 100.

[0062] like Figure 3 As shown, in a preferred embodiment of the present invention, there is a step structure between the side wall 147 and the contact portion 144, and the circumferential dimension of the side wall 147 is larger than the circumferential dimension of the contact portion 144, and the side wall 147 is arranged to face the circumferential outside and slightly protrude from the contact portion 144. The step structure can cooperate with the shell of the fire fighting device and can be used to limit the movement direction of the key unit 100 to prevent tilting, which will be described in detail in the subsequent embodiments. The side wall 147 can also be arranged to be slightly tilted to the outside, which is conducive to improving the structural stability of the key unit 100.

[0063] According to a preferred embodiment of the utility model, the contact portion 144 includes a light incident surface 1441 and a light emitting surface 1442, wherein the light incident surface 1441 is the surface of the contact portion 144 facing the circuit board 110 side, facing the light emitting element 120, and the light beam emitted by the light emitting element 120 can be irradiated onto the light incident surface 1441.

[0064] The light emitting surface 1442 faces the side opposite to the light incident surface 1441. Figure 3 and Figure 4 As shown in FIG. 1 , the light emitting surface 1442 faces the outside of the key unit 100, and a transparent area of ​​a preset shape is provided on the surface of the light emitting surface 1442. The transparent area can be provided according to the function of the key unit 100 to present the specific function or working state of the key unit 100 to the user.

[0065] In a preferred embodiment of the utility model, the outer cover 140 can be set as an integrally formed transparent structure, and a light shielding layer is set on the outer surface or the inner surface of the outer cover 140, for example, a light-proof material is brushed or deposited on the outer surface of the outer cover 140. A transparent area is processed at the light emitting surface 1442 so that the light beam emitted by the light emitting element 120 can form a preset irradiation range. Specifically, the transparent area on the surface of the light emitting surface 1442 can be formed by laser etching, chemical etching, etc., or the transparent area can be formed by blocking when forming the light shielding layer.

[0066] like Figure 5As shown, according to a preferred embodiment of the present invention, the outer cover 140 is integrally formed and further includes a positioning portion 148, which is disposed on a side of the outer cover 140 facing the circuit board 110, and specifically, for example, the positioning portion 148 protrudes toward the circuit board 110. A positioning hole 111 matching the positioning portion 148 is disposed on the circuit board 110, and the positioning portion 148 can be embedded in the positioning hole 111 to further improve the combination stability of the outer cover 140 and the circuit board 110, and can also provide positioning for the assembly position of the outer cover 140, so that the outer cover 140 can be aligned with the light emitting element 120 and the switch 130.

[0067] Furthermore, the material of the outer cover 140 preferably has a certain elasticity, such as silicone, and the positioning portion 148 can be configured to have an interference fit with the positioning hole 111 to improve the tightness of the combination of the outer cover 140 and the circuit board 110 .

[0068] The utility model also includes an embodiment of a fire fighting device 1, such as Figure 6 As shown, the fire fighting device 1 comprises a housing 200 and at least one button unit 100 as described in the above embodiments.

[0069] In this embodiment, the circuit board 110 is arranged on one side of the housing 200, and the contact portion 144 in the key unit 100 extends to the other side of the housing 200. The housing 200 can be used to protect the circuit board 110, the light-emitting element 120 and the switch 130 inside. Specifically, a plurality of through holes can be provided on the housing 200, and the contact portion 144 in the key unit 100 can extend outward from the through holes. According to the structure of the key unit 100 in the aforementioned embodiment, when the user operates the fire fighting device 1, the user can press the contact portion 144 on the outward side of the housing 200 to change the switch state of the switch 130.

[0070] In a preferred embodiment of the utility model, the outer cover 140 includes a side wall 147, and a step structure is provided between the side wall 147 and the contact portion 144, and the circumferential dimension of the side wall 147 is set to be larger than the circumferential dimension of the contact portion 144, and the housing 200 is configured to be able to be snapped at the step structure. The step structure can prevent the outer cover 140 and the circuit board 110 from being separated, and the outer cover 140 is squeezed into the space between the circuit board 110 and the housing 200. The circuit board 110 and the housing 200 are both hard structures, and the dimensional accuracy is easy to control. The position and height of the outer cover 140 are limited by the step structure, which is conducive to reducing the requirements for the processing accuracy of the outer cover 140. Further, the outer cover 140 can be squeezed by the housing 200 and the circuit board 110, so that the deformation portion 143 has a preloaded deformation amount, so that the outer cover 140 and the circuit board 110 are closely fitted, and the fixed connection form between the outer cover 140 and the circuit board 110 can be simplified.

[0071] In this embodiment, the height of the contact portion 144 extending to one side of the housing 200 is greater than the stroke of the switch 130 in the key unit 100, so as to prevent the contact portion 144 from being completely sunken into the space between the housing 200 and the circuit board 110 when the outer cover 140 is pressed, resulting in the contact portion 144 being unable to be removed, affecting the normal use of the key unit 100.

[0072] like Figure 6 and Figure 7 As shown, according to a preferred embodiment of the present utility model, the fire-fighting device 1 includes a plurality of button units 100 , and the circuit boards 110 in the plurality of button units 100 can share one circuit board 110 to simplify the internal structure of the fire-fighting device 1 .

[0073] Furthermore, the outer covers 140 in the plurality of key units 100 may also be arranged to be integrally formed, for example, the connection parts 141 of the outer covers 140 of the plurality of key units 100 are connected to each other, and a mold is opened according to the setting position of the switch 130 in the circuit board 110 to obtain an integral outer cover 140 that matches the positions of the plurality of light-emitting elements 120 and the switch 130. Preferably, positioning can be performed through the positioning part 148 and the positioning hole 111 on the circuit board 110.

[0074] In a preferred embodiment of the present invention, the light emitting elements 120 in the plurality of button units 100 of the fire fighting device 1 can be configured to emit light beams of different colors, so that the user can distinguish the button units 100 according to different colors.

[0075] Preferably, for example Figure 7 As shown in , the structures, shapes and sizes of the plurality of key units 100 may be set to be the same or different.

[0076] Finally, it should be noted that the above description is only an embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A key unit, characterized in that: include: Circuit boards; A light emitting element, wherein the light emitting element is disposed on the circuit board and is electrically connected to the circuit board; A switch, the switch is disposed on the circuit board and electrically connected to the circuit board, and the switch is disposed around the circumference of the light-emitting element; and An outer cover, the outer cover comprising: A connecting portion, the connecting portion is attached to the circuit board, and the position where the connecting portion and the circuit board are attached is located around the circumferential outer side of the switch; A trigger portion, the trigger portion being located above the switch; a deformation portion, the deformation portion being located between the connecting portion and the trigger portion and being configured to be elastically deformable so as to make the trigger portion approach or move away from the switch; and A contact portion is located above the light emitting element and at least part of the contact portion is a transparent structure.

2. The key unit according to claim 1, characterized in that: A first cavity is provided between the outer cover and the circuit board, the trigger portion is suspended above the switch, and the first cavity is located between the trigger portion and the switch.

3. The key unit according to claim 2, characterized in that: After the outer cover is compressed, the trigger portion approaches the switch, and the deformation portion undergoes elastic deformation to obtain elastic potential energy.

4. The key unit according to claim 2, characterized in that: A second cavity is further defined between the outer cover and the circuit board. The outer cover further includes a side wall, which is located between the trigger portion and the contact portion and circumferentially surrounds the second cavity.

5. The key unit according to claim 4, characterized in that: The first cavity is communicated with the second cavity.

6. The key unit according to claim 4, characterized in that: A step structure is provided between the side wall and the contact portion, and a circumferential dimension of the side wall is greater than a circumferential dimension of the contact portion.

7. The key unit according to any one of claims 1 to 6, characterized in that: The contact portion comprises: a light incident surface, the light incident surface facing the light emitting element; and A light emitting surface, the light emitting surface faces a side opposite to the light incident surface, and the surface of the light emitting surface has a transparent area of ​​a preset shape.

8. The key unit according to any one of claims 1 to 6, characterized in that: The outer cover is integrally formed, and further comprises a positioning portion, which is arranged on a side of the outer cover facing the circuit board, a positioning hole matching the positioning portion is arranged on the circuit board, and the positioning portion is embedded in the positioning hole.

9. The key unit according to any one of claims 1 to 6, characterized in that: The connecting portion and the circuit board are bonded and fixed.

10. The key unit according to any one of claims 1 to 6, characterized in that: The travel of the switch is no more than 2 mm.

11. A fire fighting device, characterized in that: include: shell; At least one key unit according to any one of claims 1 to 10, wherein a circuit board in the key unit is arranged on one side of the housing, and a contact portion in the key unit extends to the other side of the housing.

12. The fire fighting device according to claim 11, characterized in that: The outer cover also includes a side wall, a step structure is provided between the side wall and the contact portion, and the shell is clamped at the step structure; the height of the contact portion extending to one side of the shell is greater than the stroke of the switch in the key unit.

13. The fire fighting device according to claim 11 or 12, characterized in that: It comprises a plurality of the key units, the plurality of the key units share one circuit board, the outer covers of the plurality of the key units are integrally formed; the light beams emitted by the light emitting elements in the plurality of the key units have the same or different colors.

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