A high temperature resistant smoke sensor

Abstract

This utility model discloses a high-temperature resistant smoke sensor, relating to the field of smoke sensor technology. A high-temperature resistant smoke sensor includes: a housing, with a smoke detection component disposed inside the housing; a top cover fixedly connected to the upper end of the housing; and an air intake grille disposed on the surface of the top cover. This invention solves the problem that traditional smoke sensors have a temperature resistance limit of only 70-90℃. When the ambient temperature rises suddenly (e.g., a kitchen oil fire can rise from room temperature to 180℃ within 30 seconds), the housing is prone to softening and deformation due to the high temperature, leading to failure of the internal chamber's seal and even short circuits. Furthermore, in industrial settings where the temperature is consistently between 80-150℃ (e.g., in metallurgical workshops and steam boiler rooms), the aging of internal components in the smoke sensor is accelerated, causing drift in the parameters of electronic components such as capacitors and resistors, a decrease in detection sensitivity of more than 50%, and a lifespan shortened to one-third of that under normal conditions. Frequent replacements not only increase costs but also create safety hazards.

Description

Technical Field

[0001] This utility model relates to the field of smoke sensor technology, and in particular to a high-temperature resistant smoke sensor. Background Technology

[0002] Smoke detectors are the core devices for early fire warning, and their performance stability directly determines the response efficiency of safety protection. However, in high-temperature and potential open flame scenarios (such as kitchen stoves, industrial furnace workshops, boiler rooms, and areas around commercial ovens), the shortcomings of traditional smoke detectors are significantly exposed, making it difficult to meet safety protection needs.

[0003] However, existing technologies have some problems: traditional smoke detectors have a temperature resistance limit of only 70-90℃. When the ambient temperature rises suddenly (such as when a kitchen oil pan catches fire, it can rise from room temperature to 180℃ within 30 seconds), the outer shell is prone to softening and deformation due to high temperature, which can lead to failure of the internal chamber's sealing and even cause short circuits. In addition, in industrial settings where the temperature is 80-150℃ for a long time (such as in metallurgical workshops and steam boiler rooms), the aging of the internal components of the smoke detector will be accelerated, the parameters of electronic components such as capacitors and resistors will drift, the detection sensitivity will decrease by more than 50%, and the service life will be shortened to 1 / 3 of that in normal environments. Frequent replacements not only increase costs but also leave safety hazards. Therefore, it is necessary to provide a high-temperature resistant smoke detector to solve the above technical problems. Utility Model Content

[0004] This invention provides a high-temperature resistant smoke sensor, solving the problem that traditional smoke sensors have a temperature resistance limit of only 70-90℃. When the ambient temperature rises suddenly (such as when a kitchen oil pan catches fire, it can rise from room temperature to 180℃ within 30 seconds), the outer shell is prone to softening and deformation due to high temperature, leading to failure of the internal chamber's sealing and even causing a short circuit. In addition, in industrial settings where the temperature is 80-150℃ for a long time (such as in metallurgical workshops and steam boiler rooms), the aging of the internal components of the smoke sensor is accelerated, the parameters of electronic components such as capacitors and resistors drift, the detection sensitivity decreases by more than 50%, and the service life is shortened to 1 / 3 of that under normal conditions. Frequent replacement not only increases costs but also leaves safety hazards.

[0005] To solve the above-mentioned technical problems, this utility model provides a high-temperature resistant smoke sensor, comprising:

[0006] The housing has a smoke detection component inside, a top cover fixedly connected to the upper end of the housing, an air intake grille on the surface of the top cover, and a flame-retardant layer and a high-temperature resistant layer sequentially laminated on the outer surface of the housing from the inside to the outside. The flame-retardant layer is attached to the surface of the housing, and the high-temperature resistant layer covers the outer surface of the flame-retardant layer.

[0007] Preferably, the flame-retardant layer includes a ceramic fiber layer, and a PP flame-retardant plastic layer is disposed on the surface of the ceramic fiber layer, the thickness of the PP flame-retardant plastic layer being the same as the thickness of the ceramic fiber layer.

[0008] Preferably, the high-temperature resistant layer comprises a polyetheretherketone (PEEK) plastic layer, and a fluoroplastic layer is disposed on the surface of the PEEK plastic layer, wherein the thickness of the fluoroplastic layer is the same as the thickness of the PEEK plastic layer.

[0009] Preferably, the air intake grille is provided with a dustproof net inside, and the dustproof net is woven from stainless steel with a mesh diameter of 0.3-0.5mm.

[0010] Preferably, the material of the outer shell is the same as that of the top cover, and the thickness of the flame-retardant layer is the same as that of the high-temperature resistant layer.

[0011] Compared with related technologies, the high-temperature resistant smoke sensor provided by this utility model has the following beneficial effects:

[0012] This invention provides a high-temperature resistant smoke sensor. It forms a gradient protection system through a "flame-retardant layer and a high-temperature resistant layer" on the surface of the outer shell. In the inner flame-retardant layer, the ceramic fiber layer (temperature resistance ≥1260℃) can isolate direct burning by open flame. Combined with the PP flame-retardant plastic layer (oxygen index ≥32, flame retardant rating up to UL94V-0), it can remain unignited and undripping for 30 minutes at a high temperature of 200℃.

[0013] This invention provides a high-temperature resistant smoke sensor that can accurately filter oil and dust with a diameter >0.5mm through a 304 stainless steel dustproof mesh (temperature resistance ≥800℃, mesh size 0.3-0.5mm) inside the air intake grille, allowing only smoke particles (diameter usually <0.3mm) to enter. The impurity interference rate is reduced to below 5%, and the false alarm rate is reduced by 80% compared with traditional equipment.

[0014] This invention provides a high-temperature resistant smoke sensor. By setting a high-temperature resistant layer, the polyetheretherketone plastic layer (long-term temperature resistance 260℃) and the fluoroplastic layer (temperature resistance 200℃) block heat transfer inward through low thermal conductivity (thermal conductivity ≤0.2W / (m·K)), so that the outer shell and top cover do not deform or crack in a long-term environment of 150℃, thus solving the core pain point of "high-temperature failure" of traditional equipment. Attached Figure Description

[0015] Figure 1 A schematic diagram of a preferred embodiment of a high-temperature resistant smoke sensor provided by this utility model;

[0016] Figure 2 This is a bottom sectional view of the outer shell structure of this utility model;

[0017] Figure 3 This is a partial cross-sectional view of the flame-retardant layer structure of this utility model;

[0018] Figure 4 This is a partial cross-sectional view of the high-temperature resistant layer structure of this utility model.

[0019] The following are labeled in the diagram: 1. Outer shell; 2. Top cover; 3. Air intake grille; 4. Flame retardant layer; 41. Ceramic fiber layer; 42. PP flame retardant plastic layer; 5. High temperature resistant layer; 51. Polyetheretherketone plastic layer; 52. Fluoroplastic layer. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] Example 1:

[0022] Please see Figure 1-4 This utility model provides a technical solution: a high-temperature resistant smoke sensor, comprising: a housing 1, a smoke detection component disposed inside the housing 1, a top cover 2 fixedly connected to the upper end of the housing 1, an air intake grille 3 disposed on the surface of the top cover 2, and a flame-retardant layer 4 and a high-temperature resistant layer 5 sequentially laminated on the outer surface of the housing 1 from the inside to the outside, the flame-retardant layer 4 being attached to the surface of the housing 1, and the high-temperature resistant layer 5 covering the outer surface of the flame-retardant layer 4.

[0023] In this implementation scheme, when smoke appears in the environment, such as smoke particles in the early stage of a fire, the smoke diffuses into the device through the air intake grille 3 on the surface of the upper cover 2. The 304 stainless steel dustproof mesh inside the air intake grille 3 will intercept impurities with a diameter >0.5mm, such as oil droplets in kitchen fumes and workshop dust, allowing only smoke particles (diameter <0.3mm) to pass through, avoiding impurities from adhering to the surface of the smoke detection component, ensuring that the detection accuracy is not interfered with. The smoke particles passing through the air intake grille 3 and the dustproof mesh enter the internal cavity of the outer shell 1 and are captured by the smoke detection component (based on the principle of optical scattering, the infrared light emitted by the component is scattered when it encounters smoke particles, and the scattered light is captured by the receiver and converted into an electrical signal). After the electrical signal is transmitted to the internal processing unit, if the smoke concentration exceeds the preset threshold (0.8dB / m in the kitchen scenario and 0.5dB / m in the industrial scenario), the processing unit immediately triggers an alarm (such as a buzzer sounding ≥85dB, LED warning lights flashing, or linkage with the fire control system).

[0024] Example 2:

[0025] Please see Figure 1-4As shown, based on Embodiment 1, this utility model provides a technical solution: the flame-retardant layer 4 includes a ceramic fiber layer 41, and a PP flame-retardant plastic layer 42 is disposed on the surface of the ceramic fiber layer 41. The thickness of the PP flame-retardant plastic layer 42 is the same as the thickness of the ceramic fiber layer 41. The high-temperature resistant layer 5 includes a polyetheretherketone plastic layer 51, and a fluoroplastic layer 52 is disposed on the surface of the polyetheretherketone plastic layer 51. The thickness of the fluoroplastic layer 52 is the same as the thickness of the polyetheretherketone plastic layer 51. A dustproof net is disposed inside the air intake grille 3, and the dustproof net is woven from 304 stainless steel with a mesh diameter of 0.3-0.5mm. The material of the outer shell 1 is the same as the material of the upper cover 2. The thickness of the flame-retardant layer 4 is the same as the thickness of the high-temperature resistant layer 5.

[0026] In this embodiment: when the ambient temperature rises to 80-150℃ (such as the normal high temperature in an industrial workshop), the high temperature resistant layer 5 takes effect first. The polyetheretherketone plastic layer 51 and the fluoroplastic layer 52 block heat transfer through low thermal conductivity, keeping the internal temperature of the outer shell 1 below 60℃, ensuring the normal operation of the smoke detection component and circuit. When encountering short-term high temperature (150-200℃, such as a fire in a kitchen oil pan), the flame retardant layer 4 and the high temperature resistant layer 5 work together for protection. The ceramic fiber layer 41 isolates the flame from direct contact, the PP flame retardant plastic layer 42 inhibits the spread of combustion, and at the same time, the high temperature resistant layer 5 prevents the outer shell 1 from softening, maintaining the chamber's airtightness.

[0027] The working principle of the high-temperature resistant smoke sensor provided by this utility model is as follows:

[0028] Implementation steps for the first innovation point:

[0029] Step 1: When smoke appears in the environment, such as smoke particles in the early stage of a fire, the smoke diffuses into the device through the air intake grille 3 on the surface of the upper cover 2. The 304 stainless steel dustproof mesh inside the air intake grille 3 will intercept impurities with a diameter >0.5mm, such as oil droplets in kitchen fumes and workshop dust, and only allow smoke particles (diameter <0.3mm) to pass through, so as to avoid impurities adhering to the surface of the smoke detection component and ensure that the detection accuracy is not interfered with.

[0030] Step 2: Smoke particles entering the internal chamber of the outer shell 1 through the air intake grille 3 and dustproof net are captured by the smoke detection component (based on the principle of optical scattering, the infrared light emitted by the component is scattered when it encounters smoke particles, and the scattered light is captured by the receiver and converted into an electrical signal). After the electrical signal is transmitted to the internal processing unit, if the smoke concentration exceeds the preset threshold (0.8dB / m for kitchen scenarios and 0.5dB / m for industrial scenarios), the processing unit immediately triggers an alarm (such as a buzzer sounding ≥85dB, LED warning lights flashing, or linkage with the fire control system).

[0031] Implementation steps for the second innovation point:

[0032] Step 1: When the ambient temperature rises to 80-150℃ (such as the normal high temperature in an industrial workshop), the high temperature resistant layer 5 takes effect first. The polyetheretherketone plastic layer 51 and the fluoroplastic layer 52 block heat transfer through low thermal conductivity, keeping the internal temperature of the outer shell 1 below 60℃, ensuring the normal operation of the smoke detection components and circuits.

[0033] Step 2: When exposed to short-term high temperatures (150-200℃, such as a kitchen oil fire), the flame-retardant layer 4 and the high-temperature resistant layer 5 work together to protect the flames. The ceramic fiber layer 41 isolates the flames from direct contact, the PP flame-retardant plastic layer 42 inhibits the spread of combustion, and the high-temperature resistant layer 5 prevents the outer shell 1 from softening and maintains the chamber's airtightness.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature resistant smoke sensor, characterized in that: include: The outer shell (1) is provided with a smoke detection component inside. The upper end of the outer shell (1) is fixedly connected with a top cover (2). The surface of the top cover (2) is provided with an air intake grille (3). The outer surface of the outer shell (1) is sequentially laminated with a flame retardant layer (4) and a high temperature resistant layer (5) from the inside to the outside. The flame retardant layer (4) is attached to the surface of the outer shell (1), and the high temperature resistant layer (5) covers the outer surface of the flame retardant layer (4). The flame retardant layer (4) includes a ceramic fiber layer (41), and a PP flame retardant plastic layer (42) is disposed on the surface of the ceramic fiber layer (41). The thickness of the PP flame retardant plastic layer (42) is the same as the thickness of the ceramic fiber layer (41). The high-temperature resistant layer (5) includes a polyetheretherketone plastic layer (51), and a fluoroplastic layer (52) is disposed on the surface of the polyetheretherketone plastic layer (51), the thickness of the fluoroplastic layer (52) being the same as the thickness of the polyetheretherketone plastic layer (51).

2. A high-temperature resistant smoke sensor according to claim 1, characterized in that, The air intake grille (3) is equipped with a dustproof net inside, and the dustproof net is woven from 304 stainless steel with a mesh diameter of 0.3-0.5mm.

3. A high-temperature resistant smoke sensor according to claim 2, characterized in that, The material of the outer shell (1) is the same as that of the top cover (2), and the thickness of the flame retardant layer (4) is the same as that of the high temperature resistant layer (5).

Images