Composite fire detector

Abstract

The invention provides a composite fire detector, and belongs to the technical field of fire alarms. The composite fire detector comprises a shell, a visible light camera module and at least one of an infrared detection module and an ultraviolet detection module are arranged in the shell, the shell is provided with detection walls corresponding to the modules, the detection walls are provided with detection ports in one-to-one correspondence with the modules, and sealing gaskets are arranged on the inner sides of the detection walls. The sealing gasket is provided with positioning holes in one-to-one correspondence with the detection ports, light-transmitting glass is adaptively mounted in each positioning hole, the inner side of the sealing gasket is provided with a pressing plate fixedly connected with the shell, the pressing plate is provided with through holes in one-to-one correspondence with the light-transmitting glass, and the thicknesses of the sealing gasket and the light-transmitting glass meet the requirement that the sealing gasket and the light-transmitting glass can be simultaneously pressed on the detection wall by the pressing plate. According to the invention, each piece of light-transmitting glass is pressed and fixed through one pressing plate, the number of parts is reduced, the assembly operation is convenient, and the pressing plate simultaneously presses the sealing pad, so that each detection port is sealed, external water vapor is prevented from entering the shell, and the sealing performance is ensured.

Description

Technical Field

[0001] The invention relates to a composite fire detector, belonging to the technical field of fire alarms. Background Art

[0002] A fire detector is a device used in the automatic fire alarm system to detect fires on site. There are many types of fire detectors, such as temperature detection, smoke detection, light detection, gas detection, and composite detection. For example, the flame detector disclosed in the Chinese utility model patent with the authorization announcement number CN219626111U is a composite fire detector, including a housing and a visible light camera for obtaining image information of the target area, an infrared thermal imaging probe for obtaining infrared thermal imaging information of the target area, and an ultraviolet monitoring probe for obtaining ultraviolet light information of the target area, and a circuit board connected to each probe. Each probe is exposed through a hole in the housing. Although a brim structure is provided on the top of the housing, the sealing and protection are very poor. Impurities such as water vapor and dust will enter the housing through the hole, affecting the normal operation of the probe and the circuit board. And when used in an explosive hazardous environment, the fragments generated by the explosion will directly pass through the hole and impact the probe, and the explosion-proof effect is relatively poor.

[0003] Of course, there are fire detectors with protective glass in the prior art. For example, the Chinese utility model patent with authorization announcement number CN212229785U discloses an explosion-proof red-ultraviolet flame detector housing, which includes a housing body and a lower cover body. The lower cover body is provided with a detection port, and a ring groove is provided at the detection port. A glass cover is installed in the ring groove. The lower cover body is connected with a glass end cover by screws, and the glass end cover is pressed on the glass cover to fix the glass cover. The glass cover can protect the internal probe. However, this method belongs to the single-piece glass protection form. If it is used in the fire detector of patent CN219626111U, it is necessary to open a large detection port on the side wall of the shell and install a whole piece of glass, which will affect the structural strength of the shell. If the structural strength of the shell is to be guaranteed, the shell wall thickness or the glass wall thickness needs to be increased, which will increase the weight and cost. In addition, too thick glass will cause infrared radiation and ultraviolet radiation to attenuate, affecting the detection accuracy.

[0004] Therefore, without increasing weight and cost and without affecting detection accuracy, only one corresponding detection port can be set for each probe to reduce the material removed from the shell and ensure the basic strength of the shell, and then glass is installed at each detection port. However, since each glass needs to be positioned and pressed and fixed, if a ring groove and end cap are set for each glass as in patent CN212229785U, the shell wall thickness will be large and the structure will be complex. In addition, the number of end caps is large, and each end cap needs to be fixed, which is cumbersome. In addition, the end cap only realizes the compression of the glass, but cannot achieve sealing. How to ensure the sealing of the detection port and isolate water vapor from entering is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The object of the present invention is to provide a composite fire detector to solve the problems in the prior art that when a corresponding detection port is provided for each probe and glass is installed at each detection port, an annular groove needs to be provided on the shell to position the glass, resulting in a thick shell wall and a complex structure, a large number of end covers, cumbersome fixing operations, and the end covers can only press the glass but cannot achieve sealing.

[0006] To achieve the above purpose, the composite fire detector in the present invention adopts the following technical solutions: A composite fire detector comprises a shell, in which a visible light camera module and at least one of an infrared detection module and an ultraviolet detection module are arranged, the shell has a detection wall corresponding to each module, the detection wall is provided with a detection port corresponding to the detection end of each module, a sealing gasket is arranged on the inner side of the detection wall, a positioning hole corresponding to each detection port and having a size larger than the corresponding detection port is formed on the sealing gasket, a light-transmitting glass is adapted to be installed in each positioning hole, a pressing plate fixedly connected to the shell is provided on the inner side of the sealing gasket, a through hole corresponding to each light-transmitting glass and having a size larger than the corresponding light-transmitting glass is formed on the pressing plate, and the thickness of the sealing gasket and each light-transmitting glass is sufficient to be pressed against the detection wall by the pressing plate at the same time.

[0007] The beneficial effect of the above technical solution is that: the present invention is a pioneering invention, and the shell of the composite fire detector provided by the present invention is provided with a visible light camera module and at least one of an infrared detection module and an ultraviolet detection module, that is, at least two modules are provided in the shell, but it definitely includes a visible light camera module, which can take pictures to visually observe the fire situation, and at least one of the infrared detection module and the ultraviolet detection module can detect the invisible light radiation generated during combustion, so that the detector detection is more accurate. The detection wall of the shell is provided with a detection port corresponding to the detection end of each module, and the inner side of the detection wall is provided with a sealing gasket, and the sealing gasket is provided with a positioning hole corresponding to each detection port and having a size larger than the corresponding detection port size, and each positioning hole is adapted to be installed with a light-transmitting glass, and the positioning of each light-transmitting glass is realized by the sealing gasket, and there is no need to set a ring groove on the shell, which can reduce the shell wall thickness and simplify the shell structure. At the same time, the inner side of the sealing gasket is provided with a pressing plate fixedly connected to the shell, and the pressing plate is provided with a through hole corresponding to each light-transmitting glass and having a size larger than the corresponding light-transmitting glass size, so as to ensure the normal detection function of each module. At the same time, the thickness of the sealing gasket and each light-transmitting glass is sufficient to be pressed against the detection wall by the pressing plate at the same time. In this way, each light-transmitting glass can be pressed and fixed at the same time by one pressing plate, which reduces the number of parts and facilitates assembly operations. The pressing plate also presses the sealing gasket at the same time to achieve sealing of each detection port, which can prevent external water vapor from entering the shell and ensure sealing.

[0008] Furthermore, a positioning protrusion is provided on the inner wall of the shell, and a positioning groove is provided on the edge of the sealing gasket for the positioning protrusion to extend into so as to position the sealing gasket.

[0009] Furthermore, there are more than two positioning protrusions, the pressure plate is fixedly connected to the shell through locking screws, the locking screws correspond to the positioning protrusions one by one, and each positioning protrusion is provided with a threaded hole that cooperates with the locking screw.

[0010] Furthermore, a mounting plate is fixed in the shell, and each module is fixed on the mounting plate. A plurality of mounting protrusions are provided at intervals on the inner wall of the shell. The mounting plate is fixed to each mounting protrusion by fixing screws, and each mounting protrusion and each positioning protrusion are staggered in a direction perpendicular to the detection wall.

[0011] Furthermore, a mounting plate is fixed in the shell, each module is fixed on the mounting plate, and a support column is provided between at least one module and the mounting plate, and the distance from the detection end of each module to the corresponding light-transmitting glass is equal.

[0012] Furthermore, a plurality of mounting protrusions are provided at intervals on the inner wall of the shell, and the mounting plate is fixed to each mounting protrusion by means of fixing screws.

[0013] Furthermore, an end cover is detachably connected to a side of the shell away from the detection wall, and a sealing ring is arranged between the end cover and the shell.

[0014] Furthermore, an explosion-proof connector for connecting an explosion-proof hose for the line to pass through is installed on the shell.

[0015] Furthermore, the mounting plate and the housing are both made of aluminum.

[0016] Furthermore, an infrared detection module and an ultraviolet detection module are provided in the shell at the same time, and the light-transmitting glass corresponding to the ultraviolet detection module and the visible light camera module are both calcium fluoride glass, and the glass corresponding to the infrared detection module is germanium glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of an embodiment of a composite fire detector of the present invention; Figure 2 It is a cross-sectional view of an embodiment of the composite fire detector of the present invention (the section plane is parallel to the detection wall and cuts to the sealing gasket); Figure 3 It is a cross-sectional view of an embodiment of the composite fire detector of the present invention (the section plane is parallel to the detection wall and cuts to the pressure plate); Figure 4 It is a cross-sectional view of an embodiment of the composite fire detector of the present invention (the section plane is parallel to the detection wall and the sealing gasket and the pressure plate are just cut away); Figure 5 It is a cross-sectional view of an embodiment of the composite fire detector of the present invention (the section plane is parallel to the detection wall and cuts to the explosion-proof joint); Figure 6 It is a cross-sectional view of an embodiment of the composite fire detector of the present invention (the section plane is perpendicular to the detection wall and cuts to the installation interface); Figure 7 It is a cross-sectional view of an embodiment of the composite fire detector of the present invention (the section plane is perpendicular to the detection wall and cuts through the visible light camera module, but does not cut through the infrared detection module); Figure 8 A three-dimensional diagram of a housing in an embodiment of a composite fire detector of the present invention; Fig. 9 It is an assembly diagram of a pressure plate, a sealing gasket and each light-transmitting glass in an embodiment of a composite fire detector of the present invention; Fig.10 A three-dimensional diagram of a sealing gasket in an embodiment of a composite fire detector of the present invention; Fig.11 It is a three-dimensional diagram of a pressure plate in an embodiment of a composite fire detector of the present invention.

[0018] In the figure: 1, shell; 1-0, detection wall; 1-1, first detection port; 1-2, second detection port; 1-3, third detection port; 1-4, wire interface; 1-5, installation interface; 1-6, positioning protrusion; 1-7, installation protrusion; 2, end cover; 3, first light-transmitting glass; 4, second light-transmitting glass; 5, third light-transmitting glass; 6, sealing gasket; 6-1, first positioning hole; 6-2, second positioning hole; 6-3, third positioning hole; 6-4, positioning groove; 7, pressure plate; 7-1, first through hole; 7-2, second through hole; 7-3, third through hole; 7-4, screw through hole; 8, infrared detection module; 9, visible light camera module; 9-1, camera body; 9-2, camera circuit board; 9-3, first core board; 9-4, second core board; 9-5, inter-board support column; 10, ultraviolet detection module; 10-1, module body; 10-2, module circuit board; 10-3, module support column; 11, locking screw; 12, mounting plate; 13, fixing screw; 14, sealing ring; 15, control circuit board; 16, connecting column; 17, explosion-proof connector. DETAILED DESCRIPTION

[0019] In view of the technical problems existing in the prior art, the basic concept of the present invention is to position each light-transmitting glass by a sealing gasket, and at the same time control the thickness of the sealing gasket and each light-transmitting glass, and to simultaneously press the sealing gasket and each light-transmitting glass by a pressure plate fixed on the shell, thereby not only achieving the fixation of each light-transmitting glass, but also achieving the sealing at the position of each detection port, killing two birds with one stone, without the need to set a positioning groove on the shell, and at the same time reducing the number of pressure plates, which facilitates assembly operations.

[0020] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0021] Embodiment 1 of the composite fire detector of the present invention: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the composite fire detector includes a shell 1, one end of the shell 1 is provided with a detection wall 1-0, and the other end is detachably connected with an end cover 2, the specific detachable connection method is a threaded connection, and a sealing ring 14 is provided between the end cover 2 and the shell 1 to ensure the sealing between the two.

[0022] Combination Figure 6 and Figure 7As shown, an infrared detection module 8, a visible light camera module 9 and an ultraviolet detection module 10 are provided in the shell 1. The infrared detection module 8 has a temperature measurement function, and can convert the infrared radiation on the surface of an object into a visible image, and quantitatively draw the temperature distribution on the surface of the object; the visible light camera module 9 can take visible light video images; the ultraviolet detection module 10 can detect ultraviolet rays emitted during the combustion process. The combination of the three can make the detector detection more accurate.

[0023] The detection wall 1-0 of the housing 1 corresponds to the three modules. Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the detection wall 1-0 is provided with detection ports corresponding to the detection ends of each module, wherein the first detection port 1-1 corresponds to the infrared detection module 8, the second detection port 1-2 corresponds to the visible light camera module 9, and the third detection port 1-3 corresponds to the ultraviolet detection module 10. The three detection ports are all circular holes, and the inner diameters are larger than the size of the detection ends of the corresponding modules. Moreover, the three detection ports are arranged in a triangle, the inner diameters of the first detection port 1-1 and the second detection port 1-2 are the same, and the inner diameter of the third detection port 1-3 is larger than the inner diameters of the first detection port 1-1 and the second detection port 1-2.

[0024] like Figure 2 , Figure 6 , Figure 7 , Fig. 9 and Fig.10 As shown, a sealing pad 6 is provided on the inner side of the detection wall 1-0. The sealing pad 6 in this embodiment is a rubber pad. In other embodiments, a polyurethane pad or a foam plastic pad may also be used. The sealing pad 6 is provided with positioning holes corresponding to each detection port one by one and having a size larger than the corresponding detection port. The first positioning hole 6-1 corresponds to the first detection port 1-1, the second positioning hole 6-2 corresponds to the second detection port 1-2, and the third positioning hole 6-3 corresponds to the third detection port 1-3. The three positioning holes are all round holes. The inner diameters of the first positioning hole 6-1 and the second positioning hole 6-2 are the same, and the inner diameter of the third positioning hole 6-3 is larger than the inner diameters of the first positioning hole 6-1 and the second positioning hole 6-2.

[0025] Each positioning hole is adapted to be installed with a light-transmitting glass. "Adapted" means that each light-transmitting glass is round, and the outer diameter is equal to the inner diameter of the corresponding positioning hole. The first light-transmitting glass 3 is installed in the first positioning hole 6-1, the second light-transmitting glass 4 is installed in the second positioning hole 6-2, and the third light-transmitting glass 5 is installed in the third positioning hole 6-3. In this embodiment, the first light-transmitting glass 3 is germanium glass, which has good transmittance in the infrared band and can improve the detection accuracy of the infrared detection module 8. The second light-transmitting glass 4 and the third light-transmitting glass 5 are both calcium fluoride glass, which has good transmittance in the ultraviolet, visible and infrared bands, especially in the ultraviolet band. The transmittance is the best, ensuring the detection accuracy of the visible light camera module 9 and the ultraviolet detection module 10. In addition, both the germanium glass and the calcium fluoride glass are explosion-proof designs, which can withstand a pressure test of 2MPa and improve the explosion-proof effect of the detector.

[0026] like Figure 3 , Figure 6 , Figure 7 , Fig. 9 and Fig.11 As shown, a pressure plate 7 is provided on the inner side of the sealing gasket 6, and the pressure plate 7 is fixedly connected to the housing 1. The pressure plate 7 is provided with through holes corresponding to each light-transmitting glass one by one and having a size larger than the size of the corresponding light-transmitting glass, wherein the first through hole 7-1 corresponds to the first light-transmitting glass 3, the second through hole 7-2 corresponds to the second light-transmitting glass 4, and the third through hole 7-3 corresponds to the third light-transmitting glass 5. The three through holes are all circular holes, the inner diameters of the first through hole 7-1 and the second through hole 7-2 are the same, and the inner diameter of the third through hole 7-3 is larger than the inner diameters of the first through hole 7-1 and the second through hole 7-2. Each through hole is coaxially arranged with the corresponding light-transmitting glass and the detection port to ensure that the three modules can be detected normally.

[0027] In the present invention, the thickness of the sealing gasket 6 and each light-transmitting glass is sufficient to be pressed onto the detection wall 1-0 by the pressing plate 7 at the same time, that is, the thickness of each light-transmitting glass is equal, and considering that the sealing gasket 6 can undergo elastic deformation, the natural thickness of the sealing gasket 6 is slightly larger than the thickness of each light-transmitting glass, so that each light-transmitting glass can be pressed and fixed by a pressing plate 7, the number of parts is reduced, and the assembly operation is convenient, and the pressing plate 7 presses the sealing gasket 6 at the same time, thereby realizing the sealing of each detection port, which can prevent external water vapor from entering the interior of the shell 1 and ensure the sealing.

[0028] like Figure 2 and Figure 8 As shown, the housing 1 has a cylindrical inner cavity, and the sealing gasket 6 and the pressure plate 7 are both circular in shape. In addition, a positioning protrusion 1-6 is provided on the inner wall of the housing 1. There are two positioning protrusions 1-6, which are symmetrically arranged along the radial direction of the cylindrical inner cavity, and each positioning protrusion 1-6 is triangular. Figure 2 , Fig. 9 and Fig.10 As shown, the edge of the sealing gasket 6 is provided with a positioning groove 6-4 for the positioning protrusion 1-6 to extend into to position the sealing gasket 6. Obviously, there are also two positioning grooves 6-4 and they are arranged symmetrically along the radial direction. Each positioning groove 6-4 is a V-shaped groove, which is convenient for the installation of the sealing gasket 6.

[0029] Furthermore, the pressure plate 7 is fixedly connected to the housing 1 through a locking screw 11, and the locking screw 11 corresponds to the positioning protrusions 1-6 one by one, that is, there are two locking screws 11, and each positioning protrusion 1-6 is provided with a threaded hole that cooperates with the locking screw 11, and the pressure plate 7 is provided with a screw through hole 7-4 ( Fig.11 As shown). In this way, the positioning protrusion 1-6 plays two roles, which is to position the sealing gasket 6 and to fix the pressure plate 7.

[0030] like Figure 4 , Figure 6 and Figure 7 As shown, a mounting plate 12 is fixed in the housing 1, and each module is fixed on the mounting plate 12 to facilitate the installation of each module. A plurality of mounting protrusions 1-7 are provided on the inner wall of the housing 1 at intervals. In this embodiment, there are four ( Figure 8 As shown in the figure, the mounting plate 12 is fixed on each mounting protrusion 1-7 by fixing screws 13 to realize the fixed installation of the mounting plate 12. In addition, each mounting protrusion 1-7 is staggered with each positioning protrusion 1-6 in a direction perpendicular to the detection wall 1-0. When assembling the detector, the sealing gasket 6 and each light-transmitting glass are first installed into the housing 1, and then the pressing plate 7 is installed. The locking screws 11 are passed through the pressing plate 7 and fixedly connected with each positioning protrusion 1-6. Since the mounting protrusions 1-7 are staggered, the installation operation of the locking screws 11 is not affected. Of course, since the sealing gasket 6 can be deformed, it can easily pass through each mounting protrusion 1-7. In order to facilitate the smooth passage of the pressing plate 7, the outer diameter of the pressing plate 7 is smaller than the inner diameter of the housing 1, so that the pressing plate 7 can pass through each mounting protrusion 1-7 by tilting it.

[0031] like Figure 6 and Figure 7As shown, the visible light camera module 9 includes a camera body 9-1, a camera circuit board 9-2, a first core board 9-3 and a second core board 9-4, wherein the first core board 9-3 and the second core board 9-4 are FPGA core boards for processing the captured images. The second core board 9-4 is fixed on the mounting plate 12, the first core board 9-3 is fixed above the second core board 9-4 through the inter-board support column 9-5, the camera circuit board 9-2 is fixed above the first core board 9-3 through the inter-board support column 9-5, and the camera body 9-1 is fixed on the camera circuit board 9-2, so that the distance from the detection end of the camera body 9-1 to the second light-transmitting glass 4 is close enough.

[0032] The ultraviolet detection module 10 includes a module body 10-1 and a module circuit board 10-2. The module circuit board 10-2 is fixed to the mounting plate 12 through a module support column 10-3. The module body 10-1 is fixed to the module circuit board 10-2, so that the distance between the detection end of the module body 10-1 and the third light-transmitting glass 5 is close enough. The infrared detection module 8 itself has a certain height and is directly fixed on the mounting plate 12. The distances between the detection ends of the three modules and the corresponding light-transmitting glass are equal to ensure the detection effect.

[0033] like Figure 5 , Figure 6 and Figure 7 As shown, a control circuit board 15 is also provided in the housing 1. The control circuit board 15 is fixed below the mounting plate 12 via a connecting column 16. The control circuit board 15 is connected to the circuit boards and core boards of each module to obtain detection information of each module.

[0034] like Figure 1~Figure 5 As shown, the housing 1 is provided with a wire interface 1-4 communicating with the cylindrical inner cavity, two wire interfaces 1-4 are provided and arranged symmetrically, and explosion-proof connectors 17 are respectively installed on the two wire interfaces 1-4, and the explosion-proof connectors 17 are used to connect explosion-proof hoses. The explosion-proof connectors 17 and the explosion-proof hoses facilitate the laying of electrical lines, and the lines are connected to the circuit boards in the housing 1. In addition, the housing 1 is also provided with a mounting interface 1-5, which is a threaded interface, which is convenient for connection with a fixed bracket to realize the deployment of the fire detector on site.

[0035] In addition, the shell 1, the end cover 2, the mounting plate 12 and the pressure plate 7 are all made of aluminum, which can not only reduce the weight of the detector, but also meet the explosion-proof requirements, have a wide range of uses, can be installed in explosive hazardous environments, can withstand specific shock waves, and meet specific explosion-proof grade standards. In addition, the surface of the shell 1 and the end cover 2 is covered with an ablation-resistant coating, which can withstand high temperature and ablation for a certain period of time, and the entire detector has good sealing performance, which can prevent the internal components of the detector from directly contacting high temperature, and can prevent harmful gases, liquids and dust from entering the detector, ensuring the operating environment of the internal components.

[0036] In summary, the composite fire detector of the present invention integrates multiple detection modules, can detect multi-dimensional image information, and realize high-precision, high-efficiency, and high-stability identification and detection in complex fire environments. The detector has the characteristics of explosion-proof, high-temperature resistance, and ablation resistance, ensuring the safety of operators and the surrounding environment.

[0037] In other embodiments of the composite fire detector, germanium glass may be replaced by far-infrared glass, calcium fluoride glass may be replaced by quartz glass, and of course all light-transmitting glass may be replaced by ordinary glass.

[0038] In other embodiments of the composite fire detector: the mounting plate and the shell may also be made of steel.

[0039] In other embodiments of the composite fire detector: an explosion-proof joint may no longer be installed on the shell. In this case, a metal tube may be used to directly connect to the wire-passing interface, and the wires are routed inside the metal tube. Of course, in other embodiments, the lines may also directly pass through the wire-passing interface and be connected to the internal circuit board. In this case, it is only necessary to ensure the sealing between the lines and the wire-passing interface.

[0040] In other embodiments of the composite fire detector, the end cover and the housing can be connected by a flange, in which case the sealing ring is sandwiched between the flange end faces. Of course, the end cover and the housing can also be bonded and fixed, and the sealing is directly ensured by glue.

[0041] In other embodiments of the composite fire detector: the number of mounting protrusions may be two, three, five or more, depending on the specific size of the inner cavity of the housing. In other embodiments, the inner wall of the housing may no longer be provided with multiple mounting protrusions, but with an annular protrusion, and the mounting plate is fixed on the annular protrusion.

[0042] In other embodiments of the composite fire detector: according to the specific size of each module and the layout position of the mounting plate, support columns may be provided between the three modules and the mounting plate, or between two modules and the mounting plate, and the two modules may be an infrared detection module and a visible light camera module, or an infrared detection module and an ultraviolet detection module. In other embodiments, a support column may be provided between only one module and the mounting plate, and the module may be an infrared detection module, a visible light camera module, or an ultraviolet detection module.

[0043] In other embodiments of the composite fire detector: an integral mounting plate is no longer fixed in the shell, but a mounting plate is provided for each module separately, or the mounting protrusions provided on the inner wall of the shell are of sufficient size so that each module can be directly fixed on the corresponding mounting protrusions.

[0044] In other embodiments of the composite fire detector: when there are both installation protrusions and positioning protrusions in the shell, the two can also be arranged in alignment in the direction perpendicular to the detection wall. At this time, as long as the distance between the two is sufficient, the tool can be accommodated between the two to realize the installation operation of the locking screw.

[0045] In other embodiments of the composite fire detector: three or more positioning protrusions may be provided, and of course only one may be provided. When there is only one positioning protrusion, the fixing effect of the pressure plate is greatly reduced. At this time, in order to ensure the clamping effect on the sealing gasket and each light-transmitting glass, screw holes may be opened at other positions of the pressure plate and the sealing gasket, and threaded holes may be processed on the detection wall. The threaded holes are blind holes and correspond to the screw holes on the pressure plate and the sealing gasket. Another screw is used to pass through the pressure plate and the sealing gasket and fixedly connected to the detection wall to ensure the fixing effect of the pressure plate. At this time, the pressure plate is fixed on the positioning protrusion and the detection wall at the same time.

[0046] In other embodiments of the composite fire detector: the positioning protrusion may no longer be provided on the inner wall of the shell, and the pressure plate is no longer fixed on the positioning protrusion, but only fixed on the detection wall, that is, all screws pass through the pressure plate and the sealing gasket and are fixedly connected to the detection wall.

[0047] In other embodiments of the composite fire detector: only a visible light camera module and an infrared detection module may be arranged in the shell, and an ultraviolet detection module is no longer arranged. Of course, in other embodiments, only a visible light camera module and an ultraviolet detection module may be arranged, and an infrared detection module is no longer arranged. In these cases, there are only two detection ports on the detection wall, two positioning holes on the sealing gasket, two light-transmitting glass, and two through holes on the pressure plate, and the fire detector is still a composite detector.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A composite fire detector, characterized in that: The invention comprises a shell, in which a visible light camera module and at least one of an infrared detection module and an ultraviolet detection module are arranged, the shell has a detection wall corresponding to each module, the detection wall is provided with a detection port corresponding one-to-one to the detection end of each module, a sealing gasket is arranged on the inner side of the detection wall, a positioning hole corresponding one-to-one to each detection port and having a size larger than the size of the corresponding detection port is formed on the sealing gasket, a light-transmitting glass is adapted to be installed in each positioning hole, a pressure plate fixedly connected to the shell is provided on the inner side of the sealing gasket, a through hole corresponding one-to-one to each light-transmitting glass and having a size larger than the size of the corresponding light-transmitting glass is provided on the pressure plate, and the thickness of the sealing gasket and each light-transmitting glass is sufficient to be pressed against the detection wall by the pressure plate at the same time.

2. The composite fire detector according to claim 1, characterized in that: A positioning protrusion is arranged on the inner wall of the shell body, and a positioning groove is arranged on the edge of the sealing gasket for the positioning protrusion to extend into so as to position the sealing gasket.

3. The composite fire detector according to claim 2, characterized in that: There are more than two positioning protrusions, the pressure plate is fixedly connected to the shell through locking screws, the locking screws correspond to the positioning protrusions one by one, and each positioning protrusion is provided with a threaded hole that cooperates with the locking screw.

4. The composite fire detector according to claim 3, characterized in that: A mounting plate is fixed in the shell, and each module is fixed on the mounting plate. A plurality of mounting protrusions are provided at intervals on the inner wall of the shell. The mounting plate is fixed to each mounting protrusion by fixing screws. Each mounting protrusion and each positioning protrusion are staggered in a direction perpendicular to the detection wall.

5. The composite fire detector according to any one of claims 1 to 3, characterized in that: A mounting plate is fixed in the shell, each module is fixed on the mounting plate, and a support column is arranged between at least one module and the mounting plate. The distance from the detection end of each module to the corresponding light-transmitting glass is equal.

6. The composite fire detector according to claim 5, characterized in that: A plurality of mounting protrusions are protruded at intervals on the inner wall of the shell, and the mounting plate is fixed on each mounting protrusion by fixing screws.

7. The composite fire detector according to any one of claims 1 to 4, characterized in that: An end cover is detachably connected to one side of the shell away from the detection wall, and a sealing ring is arranged between the end cover and the shell.

8. The composite fire detector according to any one of claims 1 to 4, characterized in that: An explosion-proof joint for connecting an explosion-proof hose for passing the line is installed on the shell.

9. The composite fire detector according to claim 5, characterized in that: The mounting plate and housing are made of aluminum.

10. The composite fire detector according to any one of claims 1 to 4, characterized in that: An infrared detection module and an ultraviolet detection module are provided in the shell. The light-transmitting glass corresponding to the ultraviolet detection module and the visible light camera module are both calcium fluoride glass, and the glass corresponding to the infrared detection module is germanium glass.

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