Patent Application
20240054874
The present invention relates to a smoke detector, and more particularly, to a smoke detector with preferred smoke conductivity and preferred gaseous permeability.
A conventional optical smoke detection device includes a circuit board, an optical detector and a housing. The optical detector is disposed on the circuit board. The housing is installed on the circuit board to cover the optical detector. The conventional optical smoke detection device forms a plurality of holes on the housing. External gaseous matter flows into and out of the housing through the holes. The optical detector projects an optical signal onto the gaseous matter inside the housing, and detects variation of scattering parameters resulted from the illuminated gaseous matter to determine concentration of the gaseous matter. However, a detection accuracy of the optical detector is affected because ambient light easily enters the housing through the holes. One solution forms the holes on an end of the housing distant from the optical detector, but gaseous permeability of the housing is decreased so that the conventional optical smoke detection device cannot provide preferred detection accuracy. Another solution disposes a shelter around the housing, and the gaseous permeability of the housing is also decreased to level down the detection accuracy of the optical detector. Therefore, design of a smoke detector with preferred smoke conductivity and preferred gaseous permeability and without interference from the ambient light is an important issue in the mechanical design industry.
The present invention provides a smoke detector with preferred smoke conductivity and preferred gaseous permeability for solving above drawbacks.
According to the claimed invention, a smoke detector includes a substrate, an optical detection module, a base and a top cover. The substrate has a ring shape region surrounding a central detection region, and a first block structure of the central detection region is protruded from the substrate and higher than an upper surface of the ring shape region. The optical detection module is disposed inside the central detection region. The base is disposed on the substrate and around the optical detection module. The base has a second block structure. The top cover is connected to the base. A lateral wall of the top cover is partly overlapped with the second block structure to form a guiding channel. The optical detection module analyzes variation of scattering parameters resulted from gaseous matter entering the top cover through the guiding channel for determining concentration of the gaseous matter.
According to the claimed invention, the top cover includes the lateral wall and a cover body connected to each other. At least one of the lateral wall and the cover body has an airtight property.
According to the claimed invention, a dimming structure is disposed on an inner surface of the top cover.
According to the claimed invention, a top of the first block structure is higher than an upper surface of the optical detection module.
According to the claimed invention, the top of the first block structure is overlapped with the lateral wall of the top cover.
According to the claimed invention, the central detection region includes a sunken structure whereon inside the optical detection module is disposed.
According to the claimed invention, the ring shape region includes a plurality of grooves, and a top end of each groove is lower than a top of the first block structure.
According to the claimed invention, a dimming structure is disposed on an inner surface of the substrate adjacent to the guiding channel.
According to the claimed invention, a radial dimension of the lateral wall is smaller than a radial dimension of the second block structure.
According to the claimed invention, the base is integrated with the top cover monolithically.
According to the claimed invention, the smoke detector further includes a plurality of connection ribs, two opposite ends of each of the plurality of connection ribs are respectively connected to an inner surface of the base and an outer surface of the top cover.
According to the claimed invention, the optical detection module further includes an optical emitter and an optical receiver, the optical emitter emits an illumination beam toward inner of the top cover, the optical receiver receives and analyses the variation of scattering parameters resulted from the illumination beam projected onto the gaseous matter.
The present invention can utilize the substrate, the base and the top cover to form the case of the smoke detector. The optical detection module can be disposed on the central detection region of the substrate and surrounded by the first block structure. The second block structure of the base can be overlapped with the lateral wall of the top cover; the ambient light can be only projected onto the ring shape region of the substrate due to foresaid overlapping of the second block structure and the lateral wall, to avoid the optical detection module from being illuminated by the ambient light. The first block structure of the substrate can be optionally overlapped with the lateral wall of the top cover, so as to effectively prevent the ambient light from being reflected from the ring shape region to the optical detection module. The top cover of the smoke detector can have the airtight property, and the connection rib can be connected between the base and the top cover to form the openings of the guiding channel. The external gaseous matter can enter the top cover through one part of the guiding channel, and exhaust from the top cover through another part of the guiding channel. The smoke detector of the present invention can have the preferred smoke conductivity and the preferred gaseous permeability due to design of the guiding channel, and can allow smooth passing of the gaseous matter by the large-size guiding channel for the preferred detection accuracy and the preferred detection sensitivity.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
Please refer to
The case can include a substrate 14, a base 16 and a top cover 18. The substrate 14 can have a ring shape region 20 and a central detection region 22. The central detection region 22 is a place where on the optical detection module 12 is disposed. The central detection region 22 can be a hollow element; the smoke detector 10 may be installed on a circuit board (which is not shown in the figures), and the optical detection module 12 can pierce through the central detection region 22 to directly dispose on the circuit board. Besides, the central detection region 22 may be a solid element (which is not shown in the figures), and the optical detection module 12 can be directly disposed on the central detection region 22. A type of the central detection region 22 is not limited to the embodiment shown in
The ring shape region 20 can be disposed around the central detection region 22. The ring shape region 20 can have a plurality of grooves 24, and each of the plurality of grooves 24 can surround the central detection region 22 as a concentric circle. A width, a depth and a shape of the groove 24 are not limited to the embodiment shown in
The base 16 can be disposed on the substrate 14 to surround and cover the optical detection module 12, so as to provide a protection function and artistic decoration. The base 16 can have a second block structure 28 disposed on the substrate 14 as a ring. The second block structure 28 can be spaced from the top cover 18. The smoke detector 10 can further include a plurality of connection ribs 30. Two opposite ends of each connection rib 30 can be respectively connected to the inner surface of the base 16 (which means an inner lateral surface of the second block structure 28) and an outer surface of the top cover 18, and a plurality of openings can be formed between the substrate 14 and the base 16. Therefore, the top cover 18 can be connected to the second block structure 28 via the connection ribs 30. The smoke detector 10 can utilize the lateral wall 32 of the top cover 18, the second block structure 28 of the base 16, and the connection rib 30 to form a guiding channel composed of the plurality of openings. It should be mentioned that the lateral wall 32 can be partly overlapped with the second block structure 28, as shown in
The top cover 18 can include a lateral wall 32 and a cover body 34 connected to each other. The lateral wall 32 and the cover body 34 can have an airtight property; the airtight property can be interpreted as the top cover 18 having no piercing holes and the top cover 18 being made by airtight material. The gaseous matter entering the smoke detector 10 through the guiding channel can be gathered inside the top cover 18, and be detected by the optical detection module 12 and then exhausted from the smoke detector 10 through the guiding channel. The base 16, the top cover 18 and the connection rib 30 can be independent elements assembled with each other in a detachable manner; besides, the base 16 may be integrated with the top cover 18 and the connection rib 30 monolithically. The optical detection module 12 can include an optical emitter 36 and an optical receiver 38. Numbers and positions of the optical emitter 36 and the optical receiver 38 are not limited to the embodiment shown in
The lateral wall 32 of the top cover 18 can be partly overlapped with the second block structure 28 of the base 16, for preventing the ambient light from directly projecting onto the optical receiver 38, so that the smoke detector 10 can have the preferred detection accuracy of the optical detection module 12. Overlap between the lateral wall 32 and the second block structure 28 can be interpreted as a planar normal vector of the lateral wall 32 is substantially parallel to a planar normal vector of the second block structure 28, and the lateral wall 32 is partly located inside an inner space surrounded by the second block structure 28. The top of the first block structure 26 can be optionally lower than the lateral wall 32 of the top cover 18, which means the top of the first block structure 26 can be near to substrate 14, and the gaseous matter can smoothly flow into the top cover 18 through the guiding channel between the base 16 and the top cover 18 and further between the substrate 14 and the top cover 18, as the embodiment shown in
As the embodiments shown in
In conclusion, the present invention can utilize the substrate, the base and the top cover to form the case of the smoke detector. The optical detection module can be disposed on the central detection region of the substrate and surrounded by the first block structure. The second block structure of the base can be overlapped with the lateral wall of the top cover; the ambient light can be only projected onto the ring shape region of the substrate due to foresaid overlapping of the second block structure and the lateral wall, to avoid the optical detection module from being illuminated by the ambient light. The first block structure of the substrate can be optionally overlapped with the lateral wall of the top cover, so as to effectively prevent the ambient light from being reflected from the ring shape region to the optical detection module. The top cover of the smoke detector can have the airtight property, and the connection rib can be connected between the base and the top cover to form the openings of the guiding channel. The external gaseous matter can enter the top cover through one part of the guiding channel, and exhaust from the top cover through another part of the guiding channel. The smoke detector of the present invention can have the preferred smoke conductivity and the preferred gaseous permeability due to design of the guiding channel, and can allow smooth passing of the gaseous matter by the large-size guiding channel for the preferred detection accuracy and the preferred detection sensitivity.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
