Fire-fighting detector

Abstract

The utility model provides a fire-fighting detector. The fire-fighting detector comprises a base, a middle buckle, a temperature sensing disc, a circuit board and an upper cover, the base is configured to be mounted on a supporting surface and allow a cable to pass through. The middle buckle is located on the side, away from the supporting face, of the base and comprises a wiring terminal, the wiring terminal penetrates through the middle buckle, one end of the wiring terminal is electrically connected with the cable, and the other end of the wiring terminal extends to the side, away from the base, of the middle buckle. The temperature sensing disc is connected with the middle buckle, and the temperature sensing disc and the middle buckle jointly define a cavity. The temperature sensing disc comprises a first through hole. And the circuit board is sealed in the cavity and is electrically connected with the wiring terminal. The circuit board comprises a temperature sensing resistor, and the temperature sensing resistor extends from the position of the first through hole to the side, away from the middle buckle, of the temperature sensing disc. And the upper cover is buckled on the temperature sensing disc and is connected with the base. The fire-fighting detector provided by the embodiment of the utility model has better waterproof performance, can keep stable performance in a severe environment, and does not influence the detection accuracy of environment temperature.

Description

Technical Field

[0001] This utility model relates to the field of fire protection equipment technology, and in particular to a fire detector. Background Technology

[0002] Fire detection devices are an important component of fire protection systems, used to detect fire alarms within their range. Common fire detection devices include temperature monitoring devices and delayed detection devices. Typically, fire detection devices are installed in fixed locations within the premises and communicate with fire extinguishing systems to facilitate a rapid response from these systems.

[0003] However, fire detection devices operate in harsh environments, especially when using fire sprinklers for fire suppression. When a fire sprinkler is triggered, the ambient humidity is high, and liquids may directly enter the fire detection device, affecting its performance. Fire detection devices have poor adaptability to harsh environments, are easily damaged, and further increase the material costs of the fire protection system.

[0004] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Utility Model Content

[0005] To address one or more deficiencies in the prior art, this utility model provides a fire detector, the fire detector comprising:

[0006] A base, configured to be mounted on a support surface and to allow cables to pass through;

[0007] The center clip is located on the side of the base away from the support surface; the center clip includes a terminal block that passes through the center clip, one end of the terminal block is electrically connected to the cable, and the other end of the terminal block extends to the side of the center clip away from the base;

[0008] A temperature sensing plate is connected to the central buckle and together with the central buckle defines a cavity; the temperature sensing plate includes a first through hole;

[0009] A circuit board, sealed within the cavity and electrically connected to the terminals; the circuit board includes a temperature-sensing resistor extending from the first through-hole to the side of the temperature-sensing plate away from the central buckle; and

[0010] The top cover is fastened to the temperature sensing plate and connected to the base.

[0011] According to one aspect of the present invention, the fire detector further includes:

[0012] A first sealing ring is disposed between the base and the upper cover;

[0013] The second sealing ring is disposed between the temperature sensing plate and the upper cover;

[0014] The upper cover is interference-fitted with the first sealing ring and the second sealing ring.

[0015] According to one aspect of the present invention, the base is provided with a first groove around its circumference, and the first sealing ring is embedded in the first groove; the upper cover is threadedly connected to or snap-fitted to the base, and the inner side of the upper cover presses against the first sealing ring.

[0016] According to one aspect of the present invention, a first protrusion is provided on the side of the upper cover facing the temperature sensing plate, the position of the first protrusion corresponds to the position of the second sealing ring, and when the upper cover is fastened to the temperature sensing plate, the first protrusion presses against the second sealing ring.

[0017] According to one aspect of the present invention, a mounting groove is provided on the side of the buckle away from the base, the circuit board is embedded in the mounting groove, and a first encapsulation layer is filled between the mounting groove and the circuit board.

[0018] According to one aspect of the present invention, a second encapsulation layer is filled between the first through hole and the temperature sensing resistor; the top cover includes a perforated grid, the perforated grid being configured to allow the temperature sensing resistor to communicate with the outside air.

[0019] According to one aspect of the present invention, the fire detector further includes a light guide column; the temperature sensing plate further includes:

[0020] The second through hole, in which the light guide post is embedded;

[0021] A sealing groove is provided, the position of which corresponds to the position of the second through hole and surrounds the circumference of the light guide post. A third encapsulation layer is filled between the sealing groove and the light guide post.

[0022] According to one aspect of the present invention, the upper cover further includes a third through hole, and the light guide extends from the third through hole to the side of the upper cover away from the temperature sensing plate.

[0023] According to one aspect of the present invention, the base includes:

[0024] At least one flexible through-hole through which the cable passes and which covers the circumference of the cable.

[0025] According to one aspect of the present invention, the fire detector further includes:

[0026] An embedded box is disposed within the supporting surface, and the base is fixedly connected to the embedded box and fits against the supporting surface.

[0027] Compared with existing technologies, the embodiments of this utility model provide a fire detector in which the upper cover and base are connected, and a cavity is further formed between the middle cover and the temperature sensing plate. The circuit board, which is easily affected by harsh environments, is placed inside the cavity, which helps protect the components on the circuit board. The temperature sensing resistor is extended only to the side of the temperature sensing plate away from the middle cover, thereby improving the accuracy and timeliness of ambient temperature detection. The fire detector in this embodiment has good waterproof performance, can maintain stable performance in harsh environments, and does not affect the accuracy of ambient temperature detection. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 An explosion diagram of a fire detector in some embodiments of this utility model is shown;

[0030] Figure 2 The following are schematic diagrams of the structure of the fire detector in some embodiments of this utility model;

[0031] Figure 3 The following are schematic diagrams of the base structure in some embodiments of this utility model;

[0032] Figure 4 A schematic diagram showing the combination of the temperature sensing plate and the central buckle in some embodiments of this utility model is shown;

[0033] Figure 5 The diagram shows a schematic representation of the structure of the top cover in some embodiments of this utility model;

[0034] Figure 6 A cross-sectional schematic diagram of the fire detector in some embodiments of the present invention is shown;

[0035] Figure 7 The diagram shows a combination of the buckle and the circuit board in some embodiments of this utility model. Detailed Implementation

[0036] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. 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 technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0041] The embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0042] Figure 1 and Figure 2 The structure of the fire detector 100 according to some embodiments of the present invention is shown below, in conjunction with... Figure 1 and Figure 2 Please provide an explanation.

[0043] like Figure 1 As shown, the fire detector 100 includes a base 110, a middle clip 120, a temperature sensing plate 130, a circuit board 140, and a top cover 150.

[0044] like Figure 2 As shown, the base 110 can be mounted on a support surface and allows cables to pass through. The support surface can be a horizontal plane, a vertical plane, or a plane at any other angle, such as a roof or wall. The cables can be power cables and signal cables for the fire detector 100. In some embodiments, the cables are pre-embedded in the support surface and can pass through the base 110 and extend into the interior of the fire detector 100.

[0045] According to a preferred embodiment of the present invention, the base 110 and the support surface can be sealed, for example, by applying adhesive to the circumferential edge of the base 110 to reduce the penetration of liquid along the joint surface between the base 110 and the support surface into the interior of the fire detector 100, while also protecting the support surface.

[0046] The central buckle 120 is located on the side of the base 110 away from the support surface. In some embodiments, the side of the base 110 away from the support surface includes a groove structure or a stepped structure, and the central buckle 120 can be placed inside the groove structure or the stepped structure.

[0047] like Figure 1As shown, the snap-fit ​​120 includes a terminal block 121. The terminal block 121 extends through the snap-fit ​​120, one end of which can be electrically connected to a cable passing through the base 110, and the other end of which extends to the side of the snap-fit ​​120 away from the base. The terminal block 121 enables electrical connection between the cable and the circuit board 140. In some embodiments, the snap-fit ​​120 may be made of plastic and have a through hole, through which the terminal block 121 passes. Alternatively, the terminal block 121 may be embedded inside the snap-fit ​​120. Preferably, both ends of the terminal block 121 may be configured for easy electrical connection, such as providing pluggable ports or a structure that facilitates soldering.

[0048] The temperature sensing plate 130 and the middle buckle 120 are connected, and the temperature sensing plate 130 and the middle buckle 120 together define a cavity. Preferably, the temperature sensing plate 130 is located on the side of the middle buckle 120 away from the base 110, and is fixedly connected to the middle buckle 120, such as by snap-fit, adhesive, or bolt connection.

[0049] In this embodiment, the temperature sensing plate 130 and the central buckle 120 cooperate to form a cavity for accommodating the sealed circuit board 140, which is beneficial for protecting the circuit board 140. According to a preferred embodiment of this utility model, the temperature sensing plate 130 can also be configured to improve the accuracy of the fire detector 100 in detecting ambient temperature. For example, the temperature sensing plate 130 can communicate with the circuit board 140, for example, by emitting an electrical signal when the temperature reaches a threshold through different coefficients of thermal expansion. Alternatively, in some embodiments, the circuit board 140 includes a temperature-sensing resistor 141, and the temperature sensing plate 130 is configured to cooperate with the temperature-sensing resistor 141. For example, the temperature sensing plate 130 is temperature-sensitive to improve the detection accuracy of the temperature-sensing resistor 141.

[0050] The circuit board 140 is sealed within the cavity defined between the middle buckle 120 and the temperature sensing plate 130, and the circuit board 140 is electrically connected to the terminal block 121, for example, the circuit board 140 is soldered to the terminal block 121.

[0051] like Figure 1 As shown, the circuit board 140 includes a temperature-sensing resistor 141, and the temperature-sensing disk 130 includes a first through-hole 131. The first through-hole 131 penetrates the temperature-sensing disk 130 and extends into the cavity jointly defined by the temperature-sensing disk 130 and the center buckle 120. The temperature-sensing resistor 141 extends from the location of the first through-hole 131 to the side of the temperature-sensing disk 130 away from the center buckle 120. Specifically, for example, the temperature-sensing resistor 141 has longer pins and protrudes a greater height relative to the plane of the circuit board 140, so that the temperature-sensing resistor 141 can extend to the side of the temperature-sensing disk 130 away from the center buckle 120.

[0052] The temperature-sensing resistor 141 may include a thermistor, the resistance of which changes with the ambient temperature. By detecting the resistance, current flowing through, or voltage across the temperature-sensing resistor 141, the ambient temperature can be sensed, for example, to issue an alarm signal or trigger a fire extinguishing device when the temperature exceeds a threshold.

[0053] The top cover 150 is fastened onto the temperature sensing plate 130 and connected to the base 110. The top cover 150 protects the temperature sensing plate 130 and the extended temperature sensing resistor 141, reducing the risk of damage from impacts. Furthermore, the top cover 150 can be generally configured as a hollow structure to accommodate the temperature sensing plate 130 and the temperature sensing resistor 141. Reinforcing ribs can also be provided on the outer or inner surface of the top cover 150 to improve the structural strength of the top cover 150, thereby enhancing the protective effect on the temperature sensing plate 130 and the temperature sensing resistor 141.

[0054] In this embodiment of the fire detector 100, the circuit board 140 is sealed between the central latch 120 and the temperature sensing plate 130, which protects the electronic components in the circuit board 140 and reduces the impact of ambient liquids on the electronic components. Simultaneously, the temperature sensing resistor 141 extends to the side of the temperature sensing plate 130 away from the central latch 120, without affecting the temperature sensing capability of the resistor 141. The fire detector 100 in this embodiment has good waterproof performance and is suitable for harsh environments. Even if the fire extinguishing device is triggered, the fire detector 100 can maintain stable performance.

[0055] like Figure 1 As shown, according to a preferred embodiment of the present invention, the fire detector 100 further includes a first sealing ring 160 and a second sealing ring 170.

[0056] The first sealing ring 160 is disposed between the base 110 and the upper cover 150. The first sealing ring 160 can be made of an elastic material, such as rubber or silicone. The upper cover 150 and the first sealing ring 160 are interference-fitted. When the upper cover 150 is fastened onto the temperature sensing plate 130 and connected to the base 110, the first sealing ring 160 can fill the gap between the upper cover 150 and the base 110, improving the sealing effect and reducing the leakage of liquid into the interior of the fire detector 100 from the connection point between the upper cover 150 and the base 110.

[0057] According to a preferred embodiment of the present invention, such as Figure 3 As shown, a first groove 111 is provided around the base 110, and a first sealing ring 160 can be embedded in the first groove 111. The upper cover 150 and the base 110 are fixedly connected, for example, by threaded connection or snap-fit, etc. When the upper cover 150 and the base 110 are connected, the inner side of the upper cover 150 is pressed against the first sealing ring 160.

[0058] The first groove 111 can position the first sealing ring 160 to prevent the first sealing ring 160 from shifting due to the pressure of the upper cover 150 and the base 110, thus affecting the sealing effect.

[0059] The second sealing ring 170 is disposed between the temperature sensing plate 130 and the upper cover 150, and the upper cover 150 and the second sealing ring 170 are interference-fitted. For example, the upper cover 150 has a mating surface on the side facing the temperature sensing plate 130. The mating surface can be a stepped structure or a raised edge. The second sealing ring 170 is disposed on the temperature sensing plate 130, and when the upper cover 150 is fastened on the temperature sensing plate 130, the mating surface and the temperature sensing plate 130 are pressed together on the second sealing ring 170 to form an annular sealing range at the joint position of the temperature sensing plate 130 and the upper cover 150.

[0060] Specifically, such as Figure 4 and Figure 5 As shown, a mating structure can be provided on the temperature sensing plate 130 and / or the upper cover 150 to ensure that the second sealing ring 170 is fully filled between the upper cover 150 and the temperature sensing plate 130, thereby improving the sealing effect of the second sealing ring 170.

[0061] For example Figure 4 As shown, a groove or step is provided on the side of the temperature sensing plate 130 facing the upper cover 150. The second sealing ring 170 can be embedded in the groove or sleeved around the step. When the upper cover 150 is fastened on the temperature sensing plate 130, the inner wall of the upper cover 150 is pressed against the second sealing ring 170.

[0062] Or, such as Figure 5 As shown, a first protrusion 151 is provided on the side of the upper cover 150 facing the temperature sensing plate 130. The position of the first protrusion 151 corresponds to the position of the second sealing ring 170. When the upper cover 150 is fastened on the temperature sensing plate 130, the first protrusion 151 presses against the second sealing ring 170.

[0063] Preferred, such as Figure 6 As shown, in this embodiment, the first sealing ring 160 and the second sealing ring 170 form a sealed protection on both sides of the central buckle 120 and the temperature sensing plate 130. The circuit board 140 is located between the central buckle 120 and the temperature sensing plate 130, which can further improve the sealing protection effect of the circuit board 140. Furthermore, the first sealing ring 160 can protect the support surface, the cable passing through the base 110, and the wiring terminal 121. This embodiment, through multi-layered protection, isolates environmental factors from the influence of electronic components in the fire detector 100, thereby improving the protection effect.

[0064] In a preferred embodiment of this utility model, such as Figure 7As shown, a mounting groove 122 is provided on the side of the clip 120 away from the base 110. The circuit board 140 is embedded in the mounting groove 122, and a first encapsulation layer is filled between the mounting groove 122 and the circuit board 140. The first encapsulation layer can be a curable material, such as epoxy resin. After the circuit board 140 is mounted on the clip 120, the first encapsulation layer isolates the circuit board 140 from the external environment, reducing the impact of the environment on the circuit board 140. In this embodiment, the mounting groove 122 can fix the circuit board 140 and facilitate the formation of the first encapsulation layer, preventing the first encapsulation layer from contaminating other parts of the fire detector 100 due to its fluidity before curing.

[0065] According to a preferred embodiment of the present invention, the mounting groove 122 may include ribs protruding from the surface of the central buckle 120, forming a circumferentially surrounding groove. The size and shape of the mounting groove 122 match the size and shape of the circuit board 140, so that the circuit board 140 can be placed in the mounting groove 122. Preferably, the circuit board 140 has a through hole, and the wiring terminal 121 passes through the through hole and extends to the side of the circuit board 140 away from the central buckle 120, so as to facilitate electrical connection between the wiring terminal 121 and the circuit board 140.

[0066] Furthermore, the mounting groove 122 may be provided with a glue injection port. For example, the circumferential portion of the mounting groove 122 may be larger than the circumferential dimension of the circuit board 140, facilitating the filling of curable material into the mounting groove 122 through the glue injection port to form a first encapsulation layer. Preferably, the first encapsulation layer completely covers the circuit board 140. For example, the height of the mounting groove 122 protruding from the retainer 120 may be greater than the thickness of the circuit board 140, and the first encapsulation layer formed by the curable material may be flush with the height of the mounting groove 122, completely burying the circuit board 140 within the first encapsulation layer.

[0067] According to a preferred embodiment of the present invention, a second encapsulation layer is filled between the first through-hole 131 and the temperature sensing resistor 141. For example... Figure 4 As shown, the size of the first through-hole 131 is slightly larger than the size of the temperature-sensing resistor 141, so that the temperature-sensing resistor 141 can pass through the first through-hole 131, reducing the requirements for processing accuracy and assembly difficulty. To prevent liquid from passing through the gap between the first through-hole 131 and the temperature-sensing resistor 141, a second encapsulation layer is filled between the first through-hole 131 and the temperature-sensing resistor 141. The second encapsulation layer can be formed by curing a curable material, for example, by dispensing adhesive at the first through-hole 131.

[0068] In some embodiments, the second encapsulation layer may be formed by curing the same curable material as the first encapsulation layer. Furthermore, the second and first encapsulation layers may be connected so that the curable material of the second encapsulation layer is supported by the first encapsulation layer when uncured, preventing the curable material from overflowing and contaminating other parts of the fire detector 100.

[0069] like Figure 2 As shown, the upper cover 150 in this embodiment also includes a perforated grille 152, which allows the temperature-sensing resistor 141 to communicate with the outside air, enabling the detection of the external environment's temperature through the external space. The perforated grille 152 is preferably disposed on the circumferential side of the upper cover 150, which helps to improve air circulation and prevents external objects from directly contacting the temperature-sensing resistor 141.

[0070] like Figure 1 As shown, according to a preferred embodiment of the present invention, the fire detector 100 further includes a light guide column 180. The fire detector 100 in this embodiment can emit light signals. For example, a light emitter is integrated on the circuit board 140, which can emit different light beams at different ambient temperatures, or emit an alarm signal when the ambient temperature exceeds a threshold. The light guide column 180 allows the light signal to pass through. For example, the light guide column 180 is a transparent structure, and after the light emitter integrated on the circuit board 140 emits a light signal, the light signal can propagate through the light guide column 180 to the outside of the fire detector 100. The light guide column 180 can confine the light signal within itself, which is beneficial for light signal concentration and reduces signal loss.

[0071] Specifically, such as Figure 1 and Figure 4 As shown, the temperature sensing plate 130 also includes a second through hole 132, and a light guide post 180 is embedded in the second through hole 132. One end of the light guide post 180 extends from the position of the second through hole 132 into the cavity defined by the temperature sensing plate 130 and the central buckle 120. Preferably, the positions of the second through hole 132 and the light guide post 180 correspond to the positions of the light emitters on the circuit board 140.

[0072] The temperature sensing plate 130 also includes a sealing groove 133, which corresponds to the position of the second through hole 132 and surrounds the circumference of the light guide post 180. A third encapsulation layer is filled between the sealing groove 133 and the light guide post 180. The light guide post 180 passes through the temperature sensing plate 130 through the second through hole 132 to facilitate the transmission of light signals to the outside. Simultaneously, the sealing groove 133 and the third encapsulation layer seal the circumference of the light guide post 180, preventing liquid from extending from the gap between the light guide post 180 and the second through hole 132 into the cavity between the central buckle 120 and the temperature sensing plate 130. Specifically, the third encapsulation layer is formed by curing a curable material, which can be the same material as the first and second encapsulation layers. The sealing groove 133 can define the extent of the third encapsulation layer, reducing the amount of curable material used and preventing contamination by the curable material. In some embodiments, the third encapsulation layer contacts the light guide post 180, and the third encapsulation layer is selected from materials that have minimal impact on the optical performance of the light guide post 180.

[0073] like Figure 2 As shown, further, according to a preferred embodiment of the present invention, the light guide post 180 extends to the outer side of the upper cover 150. For example, the upper cover 150 includes a third through hole 153, and the light guide post 180 extends from the third through hole 153 to the side of the upper cover 150 away from the temperature sensing plate 130. Furthermore, the light guide post 180 protrudes from the side of the upper cover 150 away from the temperature sensing plate 130 to facilitate the transmission of light signals to the outside. In this embodiment, the light signal is transmitted outward through the light guide post 180, eliminating the need for the upper cover 150 to be a light-transmitting structure. This helps to concentrate the light signal and prevents external ambient light from having an excessive impact on the temperature sensing resistor 141, thus reducing the accuracy of the temperature sensing resistor 141 in detecting the external temperature.

[0074] According to a preferred embodiment of the present invention, such as Figure 3 As shown, the base 110 also includes at least one resilient wire-passing hole 112 through which a cable can pass, extending from the outside of the fire detector 100 to its interior, and electrically connecting to the terminal block 121. The resilient wire-passing hole 112 is elastic, allowing it to wrap around the circumference of the cable as it passes through. Specifically, for example, the resilient wire-passing hole 112 may have sidewalls made of rubber or silicone, and its radial dimension is slightly smaller than that of the cable. When the cable passes through the resilient wire-passing hole 112, the sidewalls of the resilient wire-passing hole 112 press against the circumference of the cable, which helps prevent liquid from seeping into the interior of the fire detector 100 along the edge of the cable. In some embodiments, the fire detector 100 connects to multiple cables, such as power cables and signal cables, and the base 110 may be provided with multiple resilient wire-passing holes 112, each corresponding to one cable. Furthermore, the resilient wire hole 112 is configured to be closable, meaning that the resilient wire hole 112 can be closed when no cable passes through it, for example, the resilient wire hole 112 includes resilient flaps.

[0075] In a preferred embodiment of this utility model, such as Figure 2 and Figure 6 As shown, the fire detector 100 also includes a pre-embedded box 190. The pre-embedded box 190 is disposed within the support surface, and the base 110 and the pre-embedded box 190 are fixedly connected, with the base 110 fitting snugly against the support surface. The pre-embedded box 190 can be used to house and accommodate cables, improving the stability of the connection between the fire detector 100 and the support surface, and further enhancing the waterproof protection of the fire detector 100 by ensuring the base 110 fits snugly against the support surface.

[0076] Finally, it should be noted that the above descriptions are merely embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fire detector, characterised in that, The fire detector comprises: a base configured to be mounted on a support surface and through which a cable passes; a middle buckle located on a side of the base away from the support surface; the middle buckle comprises a terminal which penetrates the middle buckle, one end of the terminal is electrically connected with the cable, and the other end of the terminal extends to a side of the middle buckle away from the base; a temperature sensing disc connected with the middle buckle and defining a cavity together with the middle buckle; the temperature sensing disc comprises a first through hole; a circuit board sealed in the cavity and electrically connected with the terminal; the circuit board comprises a temperature sensing resistor which extends from the position of the first through hole to a side of the temperature sensing disc away from the middle buckle; and an upper cover which is buckled on the temperature sensing disc and connected with the base.

2. The fire detector of claim 1, wherein, The fire detector further comprises: a first sealing ring arranged between the base and the upper cover; a second sealing ring arranged between the temperature sensing disc and the upper cover; wherein the upper cover is in interference fit with the first sealing ring and the second sealing ring.

3. The fire detector of claim 2, wherein, The base is circumferentially provided with a first groove, and the first sealing ring is embedded in the first groove; the upper cover is threadedly connected or clamped fixedly with the base, and an inner side surface of the upper cover extrudes the first sealing ring.

4. The fire detector of claim 2, wherein A first protrusion is arranged on a side of the upper cover facing the temperature sensing disc, the position of the first protrusion corresponds to the position of the second sealing ring, and the first protrusion extrudes the second sealing ring when the upper cover is buckled on the temperature sensing disc.

5. The fire detector of claim 1, wherein A mounting groove is arranged on a side of the middle buckle away from the base, the circuit board is embedded in the mounting groove, and a first encapsulation layer is filled between the mounting groove and the circuit board.

6. The fire detector of claim 5, wherein, A second encapsulation layer is filled between the first through hole and the temperature sensing resistor; the upper cover comprises a hollow lattice configured to enable the temperature sensing resistor to communicate with external air.

7. The fire detector according to claim 6, wherein The fire detector further comprises a light guide column; the temperature sensing disc further comprises: a second through hole in which the light guide column is embedded; a sealing groove which is circumferentially arranged around the light guide column and corresponds to the position of the second through hole, and a third encapsulation layer is filled between the sealing groove and the light guide column.

8. The fire detector of claim 7, wherein, The upper cover further comprises a third through hole, and the light guide column extends to a side of the upper cover away from the temperature sensing disc through the third through hole.

9. The fire detector according to any one of claims 1-8, wherein, The base comprises: at least one elastic threading hole through which the cable passes and which is circumferentially wrapped around the cable.

10. The fire detector according to any one of claims 1-8, wherein, The fire detector further comprises: a pre-embedded box arranged in the support surface, the base is fixedly connected with the pre-embedded box and is attached to the support surface.

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