Smoke sensor housing and smoke alarm

Abstract

This application provides a smoke sensor housing and a smoke alarm. The smoke sensor housing includes a base and multiple mounting tubes. The mounting tubes are disposed on the surface of the base and protrude from the surface of the base. The interior of the mounting tubes is hollow, forming a receiving cavity. The receiving cavity is inclined and forms an angle with the surface of the base. The receiving cavity is used to accommodate a transmitting tube or a receiving tube. The edge wall thickness of the light-transmitting opening of the mounting tube is less than or equal to a first preset value. By making the mounting tubes protrude from the surface of the base, setting a certain angle between the multiple mounting tubes, and setting the edge wall thickness of the light-transmitting opening to be less than or equal to the first preset value, the adhesion area of ​​condensation, dust, foreign objects, and insects in the signal reaction area is reduced, reducing the increase in signal intensity and thus reducing the probability of false fire alarms.

Description

Technical Field

[0001] This application relates to smoke alarms, and more particularly to a smoke sensor housing and a smoke alarm. Background Technology

[0002] Smoke detectors are widely used in residential buildings, commercial buildings, and public places for fire prevention and early warning. With the development of technology, modern smoke detectors are also integrated into smart home systems, supporting remote monitoring and alarm functions.

[0003] In traditional smoke detectors, the transmitting and receiving tubes are directly fixed to the smoke sensor base, on the same plane as the base. The inner walls of the base surface and the top surface of the cover constitute part of the signal-receiving area, increasing the surface area for dust adhesion. When condensation, dust, foreign objects, insects, etc., enter the smoke sensor, they will accumulate on the base, falling within the signal-receiving area and triggering signals not caused by smoke, thus causing false alarms. Utility Model Content

[0004] The purpose of this application is to provide a smoke sensor housing and a smoke alarm that reduce interference from foreign objects and lower the probability of false alarms.

[0005] In a first aspect, a smoke sensor housing includes:

[0006] The base and multiple mounting tubes are provided on the base and protrude from the surface of the base. The interior of the mounting tube is hollow to form a receiving cavity, which is used to accommodate the transmitting tube or the receiving tube and has a light-transmitting port. The receiving cavity is inclined and has an angle with the surface of the base. The edge wall thickness of the light-transmitting port is less than or equal to a first preset value.

[0007] By protruding the mounting tube onto the surface of the base and ensuring that the edge wall thickness of the light-transmitting port is less than or equal to a first preset value, the adhesion area of ​​the signal reaction zone that condensation, dust, foreign objects, and insects can occupy is reduced, thereby reducing interference signals and lowering the probability of false fire alarms.

[0008] The first preset value is 1 millimeter.

[0009] The mounting tubes are independent of each other, and the spacing between them creates gaps between them.

[0010] This also reduces the adhesion area of ​​foreign objects such as dust in the signal response area, and reduces the background signal caused by non-smoke particles.

[0011] The installation tube includes:

[0012] The first mounting tube is used to accommodate the first launching tube;

[0013] The second mounting tube is used to accommodate the second launching tube;

[0014] The third mounting tube is used to accommodate the receiving tube;

[0015] The first and second mounting pipes are arranged symmetrically with respect to the axis of the third mounting pipe.

[0016] When the first and second mounting tubes are arranged symmetrically with respect to the axis of the third mounting tube, the light emitted by the first and second emitting tubes can be more evenly distributed on the photosensitive area of ​​the receiving tube, thereby improving the detection sensitivity.

[0017] The installation tube includes:

[0018] The first mounting tube is used to accommodate the first launching tube;

[0019] The second mounting tube is used to accommodate the receiving tube; wherein the first mounting tube and the second mounting tube are arranged symmetrically with respect to the center of the base.

[0020] When the first and second mounting tubes are arranged symmetrically with respect to the center of the base, the light path is minimized and made the path most direct, thereby reducing signal attenuation caused by excessively long or complex light propagation paths and improving detection sensitivity.

[0021] The light-transmitting port is located above the base, and the height between the light-transmitting port and the surface of the base is greater than or equal to the second preset value.

[0022] The area of ​​height difference is a non-signal response area, which further reduces interference to the signal response area and lowers the probability of false alarms.

[0023] The second preset value is 1 millimeter.

[0024] The edge of the light-transmitting opening is a semi-elliptical arc.

[0025] The semi-elliptical arc can be adapted to the angle of the beam, which is beneficial for adjusting the angle at which the transmitting tube emits the beam and the angle at which the receiving tube receives the beam.

[0026] The semi-elliptical arc is formed by obliquely cutting a cylindrical receiving cavity.

[0027] The cylindrical inner wall guides the emitted light beam in a defined direction and also has a certain focusing and receiving function.

[0028] In a second aspect, a smoke alarm includes: a circuit board, a buzzer, or a smoke sensor housing of any of the above; the smoke sensor housing is used to house a transmitting tube and a receiving tube; the transmitting tube, the receiving tube, and the buzzer are connected to the circuit board.

[0029] When the light signal from the smoke sensor reaches the fire alarm condition, the control circuit sends a signal to the buzzer, causing it to sound an alarm and alert people to the fire. Attached Figure Description

[0030] The following figures illustrate non-limiting embodiments of this application.

[0031] Figure 1 A schematic diagram of the smoke sensor housing is shown.

[0032] Figure 2 This is a schematic diagram of the cover structure;

[0033] Figure 3 This is an assembly diagram of a smoke sensor.

[0034] The following icon numbers are used in the attached figures:

[0035] 1-Base; 2-Installation tube; 3-Receiving cavity; 4-Fixing seat; 5-Light passage; 6-Cover; 7-Smoke inlet channel; 8-First connector; 9-Limiting slot; 10-Second connector; 11-Limiting component; 12-Light shield. Detailed Implementation

[0036] The terms “inner,” “outer,” “upper,” “lower,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are used only for the convenience and simplification of description and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0037] Unless otherwise explicitly specified and limited, the terms “set up,” “install,” “connect,” and “link” 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

[0038] Figure 1 A schematic diagram of the smoke sensor housing is shown, as follows: Figure 1 As shown, the smoke sensor housing includes a base 1 and multiple mounting tubes 2. The mounting tubes 2 protrude from the surface of the base 1 and form an angle with the surface plane of the base 1, creating an angle between each pair. The interior of each mounting tube 2 is hollow, forming a receiving cavity 3 for accommodating a transmitting tube or a receiving tube. The receiving cavity 3 extends towards the edge of the base 1, forming a cavity for easy installation and removal of the transmitting tube or the receiving tube. The receiving cavity 3 is inclined, forming an angle with the surface of the base 1, so that the light beam emitted by the transmitting tube forms a predetermined angle with the plane of the base 1. A light-transmitting port 5 allows the light beam emitted by the transmitting tube to pass through. The edge wall thickness of the light-transmitting port 5 is less than or equal to a first preset value, reducing the adhesion area of ​​dust and other foreign objects in the light-transmitting port 5.

[0039] The first preset value can be 1 mm. The mounting tube 2 protrudes from the surface of the base 1, so the signal response area includes the surface of the light-transmitting port 5 to the inner wall of the top surface of the cover. As mentioned above, the edge wall thickness of the light-transmitting port 5 can be less than or equal to 1 mm, which reduces the adhesion area on the surface of the light-transmitting port 5, thereby significantly reducing the probability or amount of condensation, dust, foreign matter, and insects adhering to the surface of the light-transmitting port 5. Therefore, the narrower the edge wall thickness of the light-transmitting port 5, the better.

[0040] By protruding multiple mounting tubes 2 above the base 1, making them not flush with the surface of the base 1, and by reducing the edge wall thickness of the light-transmitting port 5 of each mounting tube 2 to less than or equal to 1 mm, the adhesion area of ​​condensation, dust, foreign objects, and insects in the signal reaction area is further reduced, thereby reducing the background signal caused by non-smoke particles and thus reducing the probability of false alarms.

[0041] In one embodiment, such as Figure 1 As shown, the multiple mounting tubes 2 are arranged independently of each other, and the multiple light-transmitting ports 5 are also independent and separated from each other, so that there are gaps between them. The adhesion area of ​​condensation, dust, foreign objects, and insects in the signal reaction area is only the edge wall thickness of the light-transmitting port 5, thereby further reducing any interference signals. In another embodiment, the mounting tubes 2 can also be connected to each other to form a whole, but the light-transmitting ports 5 are independent of each other.

[0042] In one embodiment, the height difference between the light-transmitting port 5 and the surface of the base 1 is greater than or equal to a second preset value, ensuring a predetermined height difference between the light-transmitting port 5 and the surface of the base 1. This prevents condensation, dust, foreign objects, and insects from accumulating on the surface of the light-transmitting port 5, instead causing them to fall from the light-transmitting port 5 onto the surface of the base 1. The second preset value can be 1 mm. For example, since the edge wall thickness of the light-transmitting port 5 is less than or equal to 1 mm, condensation, dust, foreign objects, and insects fall onto the light-transmitting port 5 and then onto the surface of the base 1, preventing them from accumulating in the light-transmitting port 5. This significantly reduces the adhesion probability or amount. Furthermore, the height difference area between the surface of the base 1 and the surface of the light-transmitting port 5 is a non-signal reaction area, meaning that light reflected from this area will not enter the receiving tube, further reducing interference to the signal reaction area and lowering the false alarm probability.

[0043] In one embodiment, the shape of the light-transmitting port 5 of the mounting tube 2 is adapted to the angle of the beam emitted by the transmitting tube. For example, the edge of the light-transmitting port 5 can be a semi-elliptical arc, which is formed by obliquely cutting a cylindrical receiving cavity. The inner wall of the cylindrical cavity can guide the emitted beam to be emitted in a defined direction, thus having the function of focusing the emitted light. Similarly, the inner wall of the cylindrical cavity has a focusing effect on the received light, making it easier for the receiving tube to receive the beam. Since the receiving cavity 3 and the transmitting tube are inclined, the beam does not pass through the light-transmitting port 5 perpendicularly (i.e., perpendicular to the base 1), but is emitted at an angle (inclined) to the surface of the base 1. The semi-elliptical arc light-transmitting port 5 can be adapted to the required angle of the beam, which is beneficial for controlling the angle at which the transmitting tube emits the beam and the angle at which the receiving tube receives the beam.

[0044] This application also provides a smoke sensor housing. Figure 2 This is a structural diagram of the cover, such as... Figure 1-2 As shown, the smoke sensor includes: Figure 2 The cover 6 shown Figure 1 The smoke sensor base 1 is shown. The cover 6 and the base 1 can be connected by glue, welding or other means, or they can be detached by clips, magnets or other means.

[0045] In one embodiment, the side of the cover 6 is provided with a smoke inlet channel 7 and a light shield (smoke inlet rib) 12. The light shield 12 can be L-shaped (as shown in the figure) or any other shape that can block ambient light from directly entering the housing without affecting the entry of smoke. The light shield 12 is used to block light from the external environment, so that only the light beam emitted by the emitting tube is in the space formed by the cover 6 and the base 1. A smoke guide channel is formed between adjacent light shields 12. After the smoke enters the smoke sensor through the smoke inlet channel 7, it will enter the signal response area more quickly under the guidance of the smoke guide channel.

[0046] In one embodiment, the smoke sensor housing further includes a mounting base 4 disposed on the surface of the base 1. The mounting base 4 and the mounting tube 2 can be directly connected or separated by a certain distance. The mounting base 4 and the mounting tube 2 can be integrally formed with the base 1, or they can be formed separately and then assembled into one piece.

[0047] like Figure 1 and Figure 2 As shown, the side of the fixing base 4 away from the edge of the base 1 can be connected to the mounting tube 2. The fixing base 4 and the mounting tube 2 are integrally formed with the base 1. The side of the fixing base 4 near the edge of the base 1 is provided with a first connecting member 8 and a limiting groove 9. The edge of the cover 6 has a second connecting member 10 and a limiting member 11 corresponding to the first connecting member 8 and the limiting groove 9, so that the first connecting member 8 can be snapped into the second connecting member 10 of the cover 6. The first connecting member 8 can be a protrusion or a groove, and the second connecting member 10 can be a groove or a protrusion corresponding to the first connecting member 8.

[0048] The plurality of mounting tubes 2 include: a first mounting tube for housing a first emitting tube; a second mounting tube for housing a second emitting tube; and a third mounting tube for housing a receiving tube. The first emitting tube can be a red LED (R emitting tube); the second emitting tube can be an infrared LED (IR emitting tube); and the receiving tube is used to receive the irradiated light beam. The receiving tube can be a full-spectrum receiving tube, capable of receiving light beams emitted by, but not limited to, the first and second emitting tubes; therefore, a light-shielding plate 12 is required to block ambient light from entering the housing. The receiving tube can also be a photodiode.

[0049] Alternatively, multiple mounting tubes 2 may include: a first mounting tube and a second mounting tube, wherein the first mounting tube is used to accommodate a first transmitting tube, which is used to emit beams of various wavelengths (including red light, infrared light, blue light, etc.); and the second mounting tube is used to accommodate a receiving tube, which can receive beams of light illuminating the receiving tube. The first mounting tube and the second mounting tube are arranged symmetrically with respect to the center of the base.

[0050] Figure 3 This is an assembly diagram of a smoke sensor provided in one embodiment of this application, as shown below. Figure 3 As shown, the first transmitting tube (R transmitting tube), the second transmitting tube (IR transmitting tube) and the receiving tube are first installed into the first mounting tube, the second mounting tube and the third mounting tube of the smoke sensor base 1, respectively. Then, the first connecting piece 8 and the limiting slot 9 of the base 1 are installed with the second connecting piece 10 and the limiting piece 11 of the cover 6, respectively. The first mounting tube and the second mounting tube are arranged symmetrically with respect to the axis of the third mounting tube.

[0051] In another embodiment, the base 1 lacks the first connector 8 and the limiting slot 9, and the cover 6 lacks the second connector 10 and the limiting member 11. In this case, the base 1 and the cover 6 can be bonded together using adhesives or the like.

[0052] This application also provides a smoke detector, including: a circuit board (not shown), a buzzer or other alarm device (not shown), and a smoke sensor. The smoke sensor, buzzer, and circuit board are connected. A transmitting tube can be connected to a driving circuit on the circuit board via pins. The driving circuit provides a stable current to the transmitting tube to ensure it emits a stable light beam. The circuit board is connected to a receiving tube and is responsible for receiving the light signal from the receiving tube. When the receiving tube receives the light beam emitted by the transmitting tube after being reflected or scattered by smoke, the receiving tube converts the detected light signal into an electrical signal via pins and transmits it to the signal processing unit on the circuit board. The signal processing unit amplifies, filters, and analyzes the signal. Based on the signal changes, the fire alarm detection unit determines whether to trigger the buzzer to sound an alarm. The buzzer can be connected to a control circuit on the circuit board via wires. When the light signal fed back by the smoke sensor meets the fire alarm conditions, the control circuit can send a signal to the buzzer to sound an alarm, alerting people to the fire.

[0053] Smoke detectors can also be equipped with integrated Wi-Fi or Bluetooth modules to connect with smartphones or other smart devices, providing remote monitoring and notification functions.

[0054] In one embodiment, smoke can enter the smoke sensor through the smoke inlet channel 7. Under normal circumstances, when there is no smoke reflecting or scattering light, the light beam emitted by the emitting tube will not directly reach the receiving tube, or the light signal intensity received by the receiving tube will be very low. When smoke enters the smoke sensor, the smoke particles will reflect or scatter the light, causing some of the light to deviate from its original path and be captured by the receiving tube. The light intensity detected by the receiving tube increases, thereby generating a signal. The first and second emitting tubes are directed towards the core reaction area and can emit light beams of different wavelengths; after the light beams pass through the smoke particles, are reflected or scattered by the smoke, and are received by the receiving tube, causing a signal increment. The smoke alarm receives the signal and sounds an alarm.

[0055] Because the emitting tube emits a beam of light towards the core detection area, smoke particles (condensation, dust, insects, and foreign objects) within that area will generate a relatively higher signal. Smoke located in other areas within the smoke sensor's internal cavity will also generate a certain signal, albeit a weaker one. The signal refers to the light signal received by the receiving tube after the beam of light emitted by the emitting tube into the detection area (including the core detection area) is reflected and / or scattered by particles within the detection area. Generally, even if there are no particles within the detection area, the receiving tube will still have a certain background signal due to reflection and / or scattering of the emitted light by the inner walls of the smoke sensor. Therefore, a predetermined signal is used to determine whether particles are present within the smoke sensor. When water vapor enters the smoke sensor, condensation can form on the inner walls of the smoke sensor's internal cavity, typically on the inner surface of the base 1 and the inner wall of the top surface of the cover. The reflection and / or scattering of the emitted light by this condensation will also cause a signal that interferes with smoke detection.

[0056] The features in the above embodiments can be combined with each other. The above embodiments are merely examples and are not intended to limit this application. Various changes and variations can be made. Any modifications, equivalent substitutions, improvements, etc., should be included within the scope of protection.

Claims

1. A smoke sensor housing characterized by, include: Base; Multiple mounting tubes are disposed on the base and protrude from the surface of the base; The mounting tube is hollow inside, forming a receiving cavity for accommodating the transmitting tube or the receiving tube and having a light-transmitting port; The receiving cavity is inclined and forms an angle with the surface of the base; The edge wall thickness of the light-transmitting port is less than or equal to a first preset value.

2. The smoke sensor housing of claim 1, wherein, The first preset value is 1 millimeter.

3. The smoke sensor housing according to claim 1 or 2, characterized in that, The mounting pipes are separated and spaced apart.

4. The smoke sensor housing according to claim 1, characterized in that, The plurality of mounting tubes include: The first mounting tube is used to accommodate the first launching tube; The second mounting tube is used to accommodate the second launching tube; The third mounting tube is used to accommodate the receiving tube; The first and second mounting tubes are arranged symmetrically with respect to the axis of the third mounting tube.

5. The smoke sensor housing according to claim 1, characterized in that, include: The first mounting tube is used to accommodate the first launching tube; The second mounting tube is used to accommodate the receiving tube; The first mounting tube and the second mounting tube are arranged symmetrically with respect to the center of the base.

6. The smoke sensor housing according to claim 1, characterized in that, The light-transmitting port is above the surface of the base, and the height difference between the light-transmitting port and the surface of the base is greater than or equal to a second preset value.

7. The smoke sensor housing according to claim 6, characterized in that, The second preset value is 1 millimeter.

8. The smoke sensor housing according to claim 1, characterized in that, The edge of the light-transmitting port is a semi-elliptical arc.

9. A smoke alarm, characterized in that, include: Circuit board, buzzer, and smoke sensor housing as described in any one of claims 1-8; The smoke sensor housing houses the transmitting tube and the receiving tube; The transmitting tube, receiving tube, and buzzer are connected to the circuit board.

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