Smoke detector

Abstract

The utility model relates to the technical field of fire-fighting appliances, and provides a smoke detector. The smoke detector comprises a cover assembly, an assembling base and a circuit board group, the cover assembly is provided with an assembling cavity and a flow guide channel, the flow guide channel penetrates through the assembling cavity and the cover assembly, and the flow guide channel is not communicated with the assembling cavity; the assembling base is connected to the cover assembly, a wiring space is arranged between the assembling base and the cover assembly, and the assembling base is provided with an assembling through hole communicated with the wiring space; the circuit board group is arranged in the assembly cavity, and the diversion channel is arranged on the peripheral side of the circuit board group and communicated with the wiring space. According to the smoke detector provided by the invention, the accumulated liquid gathered to the smoke detector can be conveniently discharged, the infiltration amount is reduced, and the protection performance on internal electrical components is improved.

Description

Technical Field

[0001] The present application relates to the technical field of fire-fighting equipment, and in particular to a smoke detector. Background Art

[0002] Smoke detectors, also known as smoke detectors, are primarily used in fire protection systems. They primarily detect smoke concentration to prevent fires. They can be categorized as ionization smoke detectors, photoelectric smoke detectors, infrared beam smoke detectors, and gas detectors. They respond to visible or invisible smoke particles, converting changes in smoke concentration detected at the detection site into electrical signals to generate an alarm.

[0003] In practice, smoke detectors are typically installed exposed to the elements to ensure timely smoke detection. This arrangement not only causes moisture in the air to easily accumulate near the smoke detector, but also allows water sprayed from firefighting to soak the detector. If this water isn't promptly drained away, it can seep into the detector, affecting its components and even damaging them.

[0004] Therefore, it is urgent to provide a smoke detector that can facilitate drainage. Utility Model Content

[0005] Based on this, it is necessary to provide a smoke detector that can facilitate the discharge of accumulated liquid in the smoke detector, reduce the amount of infiltration, and improve the protection of internal electrical components.

[0006] A smoke detector comprises a cover assembly, an assembly base and a circuit board group; the cover assembly is provided with an assembly cavity and a guide channel, the guide channel is arranged in the assembly cavity and passes through the cover assembly, and the guide channel is not connected to the assembly cavity; the assembly base is connected to the cover assembly and a wiring space is provided between the assembly base and the cover assembly, and the assembly base is provided with an assembly through hole connected to the wiring space; the circuit board group is arranged in the assembly cavity, wherein the guide channel is arranged on the outer peripheral side of the circuit board group and is connected to the wiring space.

[0007] It can be understood that the assembly base can install the smoke detector at the target position, and through the setting of the assembly through-hole, it is convenient to introduce the external wire to electrically connect with the circuit board group to realize the detection function of the smoke detector. The circuit board group is installed in the assembly cavity surrounded by the cover assembly to play a protective role. The water flow that penetrates through the assembly through-hole can be collected in the wiring space and discharged from the side of the cover assembly away from the assembly base through the guide channel, thereby reducing the moisture collected in the wiring space and further reducing the moisture that penetrates into the assembly cavity. At the same time, it is precisely because the guide channel is not connected to the assembly cavity that the amount of water that penetrates into the assembly cavity is further reduced; and the guide channel is located on the outer peripheral side of the circuit board group, which can make the water flow not pass through the circuit board group and be discharged from a position away from the circuit board group, further improving the protection of the circuit board group.

[0008] In some embodiments, the cover assembly is provided with a water retaining rib protruding from the wiring space, and the water retaining rib is arranged around the outer periphery of the guide channel.

[0009] In some embodiments, a concave cavity is provided on a side of the assembly base facing the cover assembly, a portion of the cover assembly extends into the concave cavity, and an outer peripheral side of the water retaining rib is in contact with a cavity wall of the concave cavity.

[0010] In some embodiments, the cover assembly is tilted toward a side wall of the wiring space and toward a direction close to the guide channel.

[0011] In some embodiments, the cover assembly includes an upper cover and a lower cover, which are snap-fitted and together enclose the assembly cavity, the upper cover is located between the assembly base and the lower cover, and together with the assembly base enclose the wiring space, the upper cover and / or the lower cover are connected to the assembly base; wherein, the guide channel is arranged through the upper cover and the lower cover.

[0012] In some embodiments, water-guiding columns are protruding from the opposite sides of the upper cover and the lower cover, the two water-guiding columns are connected and each has a through hole, and the two through holes are connected and jointly define the diversion channel.

[0013] In some embodiments, one of the upper cover and the lower cover is provided with a through hole extending through the upper cover along its thickness direction, and the other cover is provided with a protruding water-conducting column, which is connected to the one provided with the through hole; the water-conducting column is provided with a through hole extending through the upper cover, which is connected with the through hole and jointly defines the diversion channel.

[0014] In some embodiments, the smoke detector further includes a wire pressing structure provided on the assembly base, and the wire pressing structure is located in the wiring space.

[0015] In some embodiments, the wire pressing structure includes a wiring lug and an elastic arm, the wiring lug is provided on the assembly base, and the elastic arm is elastically connected to the assembly base and can be pressed on the wiring lug.

[0016] In some embodiments, the assembly base is provided with a guide portion; the elastic arm includes a pressing portion and an elastic body, the pressing portion is slidably connected to the guide portion, and the elastic body is pressed between the pressing portion and the assembly base, for applying a force to the pressing portion to move toward the wiring piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A cross-sectional view of a smoke detector provided in one embodiment of the present application;

[0019] Figure 2 An exploded view of a smoke detector provided in one embodiment of the present application;

[0020] Figure 3 A schematic diagram of an upper cover of a smoke detector provided in one embodiment of the present application;

[0021] Figure 4 A cross-sectional view of an upper cover of a smoke detector provided in one embodiment of the present application;

[0022] Figure 5 A schematic diagram of the assembly base of a smoke detector provided in one embodiment of the present application;

[0023] Figure 6 for Figure 5 A cross-sectional view of the smoke detector assembly is provided.

[0024] Figure numerals: 10, cover assembly; 11, upper cover; 12, lower cover; 13, water-guiding column; 13a, first water-guiding column; 13b, second water-guiding column; 20, assembly base; 21, assembly protrusion; 30, circuit board group; 50, wire pressing structure; 51, wiring piece; 52, elastic arm; 60, light-guiding column; 101, assembly cavity; 102, diversion channel; 103, water-retaining rib; 104, assembly groove; 111, limiting structure; 131, through hole; 131a, first through hole; 131b, second through hole; 201, assembly through hole; 202, concave cavity; 203, guide part; 401, wiring space; 521, pressing part; 522, elastomer; 522a, first elastomer; 522b, second elastomer. DETAILED DESCRIPTION

[0025] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0026] It should be noted that when a component is referred to as being "fixed to" or "provided on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0028] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0030] See also Figure 1 and Figure 2 , an embodiment of the present application provides a smoke detector, including a cover assembly 10, an assembly base 20 and a circuit board group 30. Among them, the cover assembly 10 is provided with an assembly cavity 101 and a guide channel 102, the guide channel 102 is provided in the assembly cavity 101 and passes through the cover assembly 10, and the guide channel 102 is not connected to the assembly cavity 101. The assembly base 20 is connected to the cover assembly 10, and a wiring space 401 is provided between the assembly base 20 and the cover assembly 10. The assembly base 20 is provided with an assembly through hole 201 connected to the wiring space 401. The circuit board group 30 is provided in the assembly cavity 101. The guide channel 102 is provided on the outer peripheral side of the circuit board group 30 and is connected to the wiring space 401. Among them, Figure 1 The arrow in the middle indicates the direction of water flow.

[0031] As can be understood, the assembly base 20 can be used to install the smoke detector at the target location. The assembly through-hole 201 facilitates the insertion of external wires for electrical connection to the circuit board assembly 30 within the assembly cavity 101, thereby achieving a smoke detection effect. Furthermore, the assembly cavity 101 protects the circuit board assembly 30, preventing external impurities, water mist, and the like from affecting the circuit board assembly 30, thereby reducing interference with the assembly base 20 at the target location. Because the assembly through-hole 201 is provided on the assembly base 20, moisture from the external environment can enter the wiring space 401 through the assembly through-hole 201. At this time, the provision of the guide channel 102 causes the moisture within the wiring space 401 to flow along the guide channel 102 under the action of gravity. Furthermore, because the guide channel 102 extends through the cover assembly 10, moisture in the wiring space 401 is fully drained, reducing the amount of moisture that accumulates in the wiring space 401 and, in turn, reducing the amount of moisture that infiltrates into the assembly cavity 101. At the same time, precisely because the guide channel 102 is not connected to the assembly cavity 101, the amount of water infiltrating into the assembly cavity 101 is further reduced; and, the guide channel 102 is located on the outer peripheral side of the circuit board group 30, so that the water flow does not pass through the circuit board group 30 and is discharged from a position away from the circuit board group 30, further improving the protection of the circuit board group 30.

[0032] The side of the cover assembly 10 facing the wiring space 401 is provided with a through hole for the wires to pass through. A sealing ring is provided on the wall of the through hole to form a seal when the wires are passed through, reducing moisture infiltration from the wiring space 401. Furthermore, a light guide 60 is provided on the side of the cover assembly 10 facing away from the assembly base 20. This light guide 60 is electrically connected to the circuit board assembly 30.

[0033] like Figure 1 As shown, the guide channel 102 is further provided through the cover assembly 10 along the axial direction of the assembly through hole 201, ensuring that the guide channel 102 can be along the direction of gravity, which facilitates water diversion. Alternatively, the guide channel 102 can be provided at an angle, sloping radially outward from top to bottom along the assembly through hole 201, ensuring that the distance between the guide channel 102 and the circuit board assembly 30 gradually increases, with the distance at the end being the largest.

[0034] In actual use, multiple diversion channels 102 are provided, spaced apart and located around the periphery of the circuit board. The provision of multiple diversion channels 102 improves drainage efficiency and facilitates timely drainage. For example, multiple diversion channels 102 are spaced apart circumferentially around the assembly through-holes 201, surrounding the periphery of the circuit board assembly 30. This allows any moisture that enters the wiring space 401 at any point along its circumference to be drained through the corresponding diversion channel 102, facilitating adequate drainage.

[0035] In some specific embodiments, the cover assembly 10 is provided with two flow guiding channels 102 , which are arranged 180 degrees apart.

[0036] Furthermore, a side wall of the cover assembly 10, facing the wiring space 401, is tilted toward the direction near the guide channel 102. Since the wiring space 401 is enclosed by the cover assembly 10 and the assembly base 20, taking the smoke detector assembled vertically as an example, the upper side wall of the cover assembly 10 can serve as the bottom of the wiring space 401. Therefore, the upper side wall is tilted toward the guide channel 102 to guide accumulated water, facilitating its timely flow into the guide channel 102 and improving the adequacy and timeliness of drainage. In particular, since the guide channel 102 is located on the outer periphery of the circuit board assembly 30, the upper side wall of the cover assembly 10, corresponding to the circuit board assembly 30, is tilted downward toward the side.

[0037] See also Figures 1 to 4 For example, the cover assembly 10 is provided with a water-retaining rib 103 protruding from the wiring space 401 and surrounding the outer periphery of the diversion channel 102. In other words, the water-retaining rib 103 defines an area for accumulated water to collect, preventing it from flowing outward and seeping into the assembly cavity 101. Furthermore, the water-retaining rib 103 exerts an inward force on the water flow, further ensuring that accumulated water flows fully into the diversion channel 102 for drainage.

[0038] like Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, further, a concave cavity 202 is provided on the side of the assembly base 20 facing the cover assembly 10, and a portion of the cover assembly 10 extends into the concave cavity 202. Such an arrangement can reduce the distance between the circuit board group 30 in the cover assembly 10 and the assembly through hole 201, and can achieve connection with a shorter wire, thereby improving the structural compactness of the entire smoke detector. Among them, the portion of the cover assembly 10 extending into the concave cavity 202 is in contact with the cavity wall of the concave cavity 202, so that there is an overlapping area between the assembly base 20 and the cover assembly 10 in the vertical direction, ensuring the contact area at the connection, and further improving the connection reliability and sealing effect. Moreover, such an arrangement allows the water-retaining rib 103 protruding from the cover assembly 10 to also extend into the concave cavity 202, thereby improving the water-retaining effect.

[0039] Specifically, the outer periphery of the water retaining rib 103 abuts against the wall of the cavity 202. This arrangement, on the one hand, increases the water retaining range, allowing the aforementioned flow guide channel 102 to be located as far away from the circuit board assembly 30 as possible, thereby reducing the flow of water toward the circuit board assembly 30; on the other hand, the water retaining rib 103 increases the mating area between the cover assembly 10 and the assembly base 20, thereby improving the sealing effect.

[0040] See also Figures 1 to 4In some embodiments, the cover assembly 10 includes an upper cover 11 and a lower cover 12, which are fastened together to form an assembly cavity 101. The upper cover 11 is located between the assembly base 20 and the lower cover 12, and together with the assembly base 20, they form a wiring space 401. The upper cover 11 and the lower cover 12 are both connected to the assembly base 20, and the guide channel 102 is provided through the upper cover 11 and the lower cover 12. The aforementioned light guide column 60 is provided on the side of the lower cover 12 facing away from the upper cover 11.

[0041] Among them, the upper cover 11 and the lower cover 12 are jointly provided with an assembly groove 104 on the side facing the assembly base 20, and the assembly base 20 is correspondingly provided with an assembly protrusion 21. The assembly protrusion 21 is inserted into the assembly groove 104, which not only meets the assembly requirements but also improves the sealing performance. The upper cover 11 and the lower cover 12 are both snap-fitted or adhesively fitted with the assembly base 20. In addition, the assembly base 20 is provided with a limiting end surface on the outer periphery of the assembly protrusion 21 for the end of the lower cover 12 to abut. A limiting structure 111 is convexly provided on the side of the upper cover 11 away from the assembly base 20 for connecting the circuit board assembly 30. The upper cover 11 and the lower cover 12 can be snap-fitted or adhesively fitted.

[0042] like Figures 1 to 3 As shown, water-guiding columns 13 are protruding from the facing sides of the upper cover 11 and the lower cover 12. The two water-guiding columns 13 are connected and each has a through-hole 131 extending therethrough. The two through-holes 131 communicate with each other and together define a diversion channel 102. The upper cover 11 corresponds to the first water-guiding column 13a, and the lower cover 12 corresponds to the second water-guiding column 13b. The first water-guiding column 13a and the second water-guiding column 13b are pluggable and mated. Specifically, the first water-guiding column 13a corresponds to the first through-hole 131a, and the second water-guiding column 13b corresponds to the second through-hole 131b. The diameter of the first through-hole 131a is larger than the diameter of the second through-hole 131b, and the outer diameter of the first water-guiding column 13a is larger than the outer diameter of the second water-guiding column 13b. The first water-guiding column 13a has a stepped section at the end facing the lower cover 12, facilitating the insertion and position-limiting of the end of the second water-guiding column 13b. A sealing ring is pressed between the first water-conducting column 13a and the second water-conducting column 13b to ensure tightness. The number of sealing rings can be one or two, depending on the length of the mating joint. Furthermore, the presence of two water-conducting columns 13 effectively isolates the flow channel 102 from the assembly cavity 101, further reducing the amount of water that seeps into the assembly cavity 101.

[0043] First through-hole 131a of first water-conducting column 13a extends through upper cover 11 along its thickness, ensuring communication between first through-hole 131a and wiring space 401. Second through-hole 131b of second water-conducting column 13b extends through lower cover 12 along its thickness, ensuring water flow is directed outward. Both first water-conducting column 13a and second water-conducting column 13b are located on the outer periphery of circuit board assembly 30.

[0044] A second water-guiding column 13 b may also be protruded from the side of the lower cover 12 facing away from the upper cover 11 to extend the flow path and reduce the possibility of direct contact between the water flow and the lower cover 12 .

[0045] In other embodiments, the upper cover 11 is provided with a through-hole extending through its thickness, and the lower cover 12 is provided with a water-conducting column 13 (i.e., a second water-conducting column 13b) having a second through-hole 131b extending therethrough. The second through-hole 131b communicates with the through-hole in the upper cover 11 and together define the diversion channel 102. In this case, the second water-conducting column 13b extends toward the upper cover 11 and can abut against it, with a sealing ring pressed between it and the upper cover 11. Alternatively, the second water-conducting column 13b can be inserted through the through-hole, with a sealing ring pressed between it and the wall of the through-hole. The second water-conducting column 13b does not protrude from the through-hole, thereby facilitating water diversion.

[0046] Alternatively, the lower cover 12 may be provided with a through hole extending through its thickness, and the upper cover 11 may be provided with a water-guiding column 13 (i.e., a first water-guiding column 13a) having a first through hole 131a extending therethrough. The first through hole 131a communicates with the through hole on the lower cover 12 and together define the diversion channel 102. The first water-guiding column 13a extends toward the lower cover 12 and may abut against the inner side wall of the lower cover 12, with a sealing ring pressed between the lower cover 12 and the first water-guiding column 13a. Alternatively, the first water-guiding column 13a may be provided through the through hole of the lower cover 12, with a sealing ring pressed between the first water-guiding column 13a and the wall of the through hole. The first water-guiding column 13a may or may not protrude from the through hole, as long as it satisfies the requirement of guiding water to reduce the amount of infiltration relative to the assembly cavity 101.

[0047] Another alternative is that both the upper cover 11 and the lower cover 12 are provided with a through hole extending through the thickness direction, and a pipe is connected between the two through holes to form the aforementioned guide channel 102, which only needs to be able to fully and timely discharge the accumulated water collected in the wiring space 401.

[0048] See also Figure 1 、 Figure 5 and Figure 6 As an example, the smoke detector further includes a wire pressing structure 50 disposed on the assembly base 20. The wire pressing structure 50 is located in the wiring space 401 and is used to connect wires. The wire pressing structure 50 is electrically connected to the circuit board assembly 30 within the assembly cavity 101 to achieve circuit conduction. The wire pressing structure 50 is described in detail below.

[0049] Optionally, the wire pressing structure 50 includes a terminal lug 51 and an elastic arm 52, wherein the terminal lug 51 is provided on the assembly base 20, and the elastic arm 52 is elastically connected to the assembly base 20 and can be pressed onto the terminal lug 51. The terminal lug 51 is connected to the circuit board assembly 30, and the elastic arm 52 can be driven to move relative to the terminal lug 51 so that the wire contacts the terminal lug 51, and then the elastic arm 52 can be pressed onto the terminal lug 51 under the elastic action to achieve wiring. In particular, when wiring, it is necessary to open the rubber sleeve of the wire so that the internal metal wire (such as copper wire, etc.) is crimped onto the terminal lug 51. The setting of the elastic arm 52, by utilizing its own elastic action, facilitates the disassembly and assembly of the wire.

[0050] Specifically, the elastic arm 52 includes a pressing portion 521 and an elastic body 522. The pressing portion 521 is slidably connected to the assembly base 20, and the elastic body 522 is pressed between the pressing portion 521 and the assembly base 20 to apply a force to the pressing portion 521 to move toward the terminal lug 51. For example, when the pressing portion 521 is located above the terminal lug 51, when a wire needs to be connected, the pressing portion 521 is pressed in a direction away from the terminal lug 51 to separate the pressing portion 521 from the terminal lug 51 and the elastic body 522 is squeezed. After the wire is placed on the terminal lug 51, the pressing portion 521 is released, and the pressing portion 521 moves toward the terminal lug 51 under the action of the elastic body 522 and is pressed against the terminal lug 51 to achieve wire connection. To disassemble, continue pressing the pressing portion 521.

[0051] The assembly base 20 is provided with a guide portion 203, and the pressing portion 521 is slidably connected to the guide portion 203 to guide the movement of the pressing portion 521. For example, the guide portion 203 may be provided with a guide groove, and the pressing portion 521 may be inserted into the guide groove; or the pressing portion 521 may be provided with a guide hole, and the guide portion 203 may be inserted into the guide hole. The guide portion 203 may also divide the pressing portion 521 into two parts, each of which corresponds to an elastic body 522, namely a first elastic body 522a and a second elastic body 522b. Figure 6 As shown, the portion located on the right side of the guide portion 203 is in direct contact with the terminal piece 51 and is engaged with the second elastic body 522b; and the portion located on the left side of the guide portion 203 is inserted into the groove on the assembly base 20 and is engaged with the first elastic body 522a.

[0052] In some specific embodiments, the two elastic bodies 522 are both compression springs, and the assembly base 20 and the compression portion 521 are both correspondingly provided with guide pillars, and the two guide pillars are located on opposite sides of the guide portion 203 to respectively sleeve a compression spring.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A smoke detector, characterized in that: include: A cover assembly (10) is provided with an assembly cavity (101) and a guide channel (102), wherein the guide channel (102) is provided in the assembly cavity (101) and runs through the cover assembly (10), and the guide channel (102) is not connected to the assembly cavity (101); An assembly base (20) is connected to the cover assembly (10) and a wiring space (401) is provided between the assembly base (20) and the cover assembly (10), and an assembly through hole (201) is provided on the assembly base (20) that is connected to the wiring space (401); A circuit board assembly (30) is provided in the assembly cavity (101), The guide channel (102) is provided on the outer peripheral side of the circuit board assembly (30) and is in communication with the wiring space (401).

2. The smoke detector according to claim 1, wherein: The cover assembly (10) is provided with a water retaining rib (103) protruding from the wiring space (401), and the water retaining rib (103) is arranged around the outer peripheral side of the guide channel (102).

3. The smoke detector according to claim 2, characterized in that A concave cavity (202) is provided on a side of the assembly base (20) facing the cover assembly (10), a portion of the cover assembly (10) extends into the concave cavity (202), and the outer peripheral side of the water retaining rib (103) is in contact with the cavity wall of the concave cavity (202).

4. The smoke detector according to claim 1, wherein: The cover assembly (10) is tilted toward a side wall of the wiring space (401) and toward a direction close to the guide channel (102).

5. The smoke detector according to claim 1, wherein: The cover assembly (10) includes an upper cover (11) and a lower cover (12), which are buckled together to enclose the assembly cavity (101), the upper cover (11) is located between the assembly base (20) and the lower cover (12), and together with the assembly base (20) enclose the wiring space (401), and the upper cover (11) and / or the lower cover (12) are connected to the assembly base (20); Wherein, the guide channel (102) is provided through the upper cover (11) and the lower cover (12).

6. The smoke detector according to claim 5, characterized in that A water-guiding column (13) is protruded from one side of the upper cover (11) and the lower cover (12) facing each other. The two water-guiding columns (13) are connected and each is provided with a through hole (131) therethrough. The two through holes (131) are connected and jointly define the diversion channel (102).

7. The smoke detector according to claim 5, characterized in that One of the upper cover (11) and the lower cover (12) is provided with a through hole penetrating along the thickness direction thereof, and the other is provided with a water guide column (13) protruding therefrom, and the water guide column (13) is connected to the one provided with the through hole; the water guide column (13) is provided with a through hole (131) penetrating therethrough, and the through hole (131) is communicated with the through hole and jointly defines the diversion channel (102).

8. The smoke detector according to claim 1, wherein: The smoke detector further comprises a wire pressing structure (50) provided on the assembly base (20), and the wire pressing structure (50) is located in the wiring space (401).

9. The smoke detector according to claim 8, characterized in that The wire pressing structure (50) comprises a wiring piece (51) and an elastic arm (52), wherein the wiring piece (51) is arranged on the assembly base (20), and the elastic arm (52) is elastically connected to the assembly base (20) and can be pressed on the wiring piece (51).

10. The smoke detector according to claim 9, characterized in that The assembly base (20) is provided with a guide portion; The elastic arm (52) comprises a pressing portion (521) and an elastic body (522), wherein the pressing portion (521) is slidably connected to the guide portion, and the elastic body (522) is pressed between the pressing portion (521) and the assembly base (20) and is used to apply a force to the pressing portion (521) to move toward the wiring piece (51).

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