A photoelectric purification system and ultraviolet light leakage alarm method thereof

Abstract

The present invention discloses a photoelectric purification system, comprising a smoke hood, a smoke exhaust pipe, a light decomposition device, a power supply and a light leakage alarm device, wherein the smoke hood and the smoke exhaust pipe are connected to each other to form a smoke exhaust channel; the light decomposition device is arranged at the connection between the smoke hood and the smoke exhaust pipe, and the light decomposition device comprises an ultraviolet light generator and a shading plate, wherein the ultraviolet light generator is arranged at one side of the smoke exhaust pipe, and generates ultraviolet light to decompose pollutant particles in the airflow in the smoke exhaust channel, and the shading plate is arranged at one side of the smoke hood, and blocks the ultraviolet light to prevent the ultraviolet light from leaking to the smoke hood; the power supply is electrically connected to the ultraviolet light generator, and provides a working voltage for the ultraviolet light generator; the light leakage alarm device comprises a first sensor and a second sensor, wherein the first sensor is arranged in the smoke hood, and the second sensor is arranged at the connection between the smoke hood and the shading plate.

Description

Technical Field

[0001] The present invention relates to the technical field of pollutant purification, and in particular to a photoelectric purification device for cooking fume, and an ultraviolet light leakage alarm method applied to the photoelectric purification device. Background Art

[0002] In line with the rapid economic development, people's living standards are also improving. The amount of edible oil used in daily diets is increasing significantly. The traditional cooking methods of frying, stir-frying and deep-frying also produce more and more fume emissions, which leads to more and more serious fume pollution. It not only has a great impact on the air environment, but also increases the risk of fire. With the increase of people's environmental awareness, families or catering industries usually install fume purifiers to reduce fume emissions. The "Catering Industry Fume Emission Standard" (GB 184832001) stipulates the standard for catering industry fume emissions.

[0003] Oil fume purifier refers to the treatment device of oil fume waste gas, which is mainly used for the purification and treatment of oil fume discharged from the kitchen at low altitude; used in hotels, restaurants, bars, restaurants, schools, institutions, factories and other places; food frying and cooking processing industry; oil splash heat treatment workshop, oil mist lubrication workshop, workpiece welding workshop and industrial occasions such as olefin oil boiler emission. So far, oil fume purification technology includes oil fume collection hood, water fume hood, water spray washing tower, high voltage electrostatic, physical filtration, biological purification, liquid foam washing and photolysis. Among them, the photolysis technology uses ultraviolet light of a specific wavelength to decompose the oil molecules of high molecular weight compounds into low molecular weight compounds and water (H2O) and carbon dioxide (CO2) to reduce the pollution of oil fume to the environment. The photoelectric purification system using photolysis technology has the advantages of high efficiency in removing odor, no need to add any auxiliary substances, strong adaptability, low operating cost and no need for pretreatment.

[0004] The ultraviolet light used in the photoelectric purification system is usually C segment (UVC), which can effectively destroy the molecular bonds of polymer compounds, but at the same time, ultraviolet light also has a negative effect on human health. Long-term exposure may cause harm to the human body or even permanent damage. According to the relevant requirements of the "Electromagnetic Radiation Protection Regulations" (GB87021988), the ultraviolet light in the fume hood of the photoelectric purification system shall not leak (including reflected light), and the 8-hour occupational exposure limit shall meet the following requirements: irradiance ≤ 0.13μW / cm 2 , irradiation ≤1.8mJ / cm 2 According to the requirements of "Special requirements for antibacterial, sterilization, purification functions and air purifiers for household and similar electrical appliances" (GB21551.3), the UV intensity is ≤5μW / cm 2 . Summary of the invention

[0005] In view of the above requirements, the present invention discloses a photoelectric purification system, comprising a smoke hood, a smoke exhaust duct, a light decomposition device and a power supply, wherein the smoke hood and the smoke exhaust duct are interconnected to form a smoke exhaust channel; the light decomposition device is arranged at the connection between the smoke hood and the smoke exhaust duct, and the light decomposition device comprises an ultraviolet light generator and a sunshade, wherein the ultraviolet light generator is arranged at one side of the smoke exhaust duct, and generates ultraviolet light to decompose pollutant particles in the airflow in the smoke exhaust channel, and the sunshade is arranged at one side of the smoke hood, and blocks the ultraviolet light to prevent it from leaking into the smoke hood; the power supply is electrically connected to the ultraviolet light generator and provides a working voltage for the ultraviolet light generator; and the light leakage alarm device is also included, wherein the light leakage alarm device comprises a first sensor and a second sensor, wherein the first sensor is arranged in the smoke hood, and the second sensor is arranged at the connection between the smoke hood and the sunshade.

[0006] Further, the first sensor is a light sensor that only detects the ultraviolet light. When the first sensor detects the ultraviolet light, an alarm is issued and the power supply is cut off. The second sensor includes a limit switch, and the mechanical part of the limit switch is respectively connected to the shading plate and the smoke hood. When the shading plate deviates from the installation position, the limit switch activates an alarm.

[0007] Preferably, the light leakage alarm device also includes a third sensor arranged in the smoke exhaust duct, and the third sensor is a light sensor for detecting light of different wavelengths, which is in a wavelength band outside the wavelength band of the ultraviolet light. When the third sensor detects the light of different wavelengths, an alarm is issued.

[0008] Furthermore, the light leakage alarm device further comprises a light source emitting light of a specific wavelength band, the light source is arranged in close proximity to the ultraviolet light generator, the first sensor is a light sensor that only detects light of the specific wavelength band, and when the first sensor detects light of the specific wavelength band, an alarm is issued and the power supply is cut off;

[0009] Preferably, the light leakage alarm device also includes a third sensor arranged in the smoke exhaust duct, and the third sensor is a light sensor for detecting light of a different wavelength band, and the light of a different wavelength band is in a wavelength band other than the wavelength band of the ultraviolet light and the light of the specific wavelength band. When the third sensor detects the light of the different wavelength band, an alarm is issued.

[0010] Furthermore, the ultraviolet light generator emits C-segment ultraviolet light when in operation, and the wavelength of the C-segment ultraviolet light is 185 nm.

[0011] Furthermore, it also includes a smoke exhaust fan, which is arranged in the smoke exhaust duct and is used to generate negative pressure to make the air flow flow in the exhaust channel.

[0012] The present invention also discloses an ultraviolet light leakage alarm method for a photoelectric purification system, comprising:

[0013] Turning on the power supply makes the ultraviolet light generator of the photodecomposition device emit ultraviolet light;

[0014] When the light leakage alarm device detects the ultraviolet light, an alarm is sounded and the power supply is cut off.

[0015] Furthermore, the light leakage alarm device comprises a first sensor and a second sensor, wherein the first sensor is arranged in the smoke collecting hood, and the second sensor is arranged at the connection between the smoke collecting hood and the shading plate.

[0016] Preferably, the first sensor is a light sensor that detects only the ultraviolet light; when the first sensor detects the ultraviolet light, an alarm is issued and the power supply is cut off.

[0017] Preferably, the second sensor comprises a limit switch, the mechanical part of which is respectively connected to the shading plate of the light decomposition device and the smoke collecting hood of the photoelectric purification system; when the shading plate deviates from the installation position, the limit switch activates an alarm.

[0018] Preferably, the light leakage alarm device also includes a third sensor arranged in the smoke exhaust duct, and the third sensor is a light sensor for detecting light of different wavelengths, which is in a wavelength band outside the wavelength band of the ultraviolet light; when the third sensor detects the light of different wavelengths, an alarm is issued.

[0019] Furthermore, the light leakage alarm device also includes a light source that emits light of a specific wavelength band, which is arranged in close proximity to the ultraviolet light generator. The first sensor is a light sensor that only detects light of the specific wavelength band. When the first sensor detects light of the specific wavelength band, an alarm is issued and the power supply is cut off.

[0020] Preferably, the light leakage alarm device also includes a third sensor arranged in the smoke exhaust duct, and the third sensor is a light sensor for detecting light of different wavelengths, and the light of different wavelengths is in a wavelength band other than the wavelength band of the ultraviolet light and the light of the specific wavelength band; when the third sensor detects the light of different wavelengths, an alarm is issued. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a photoelectric purification system according to an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of a photoelectric purification system according to another embodiment of the present invention.

[0023] The accompanying drawings are denoted as follows:

[0024] 1: Photolysis device 11: Light shielding plate

[0025] 12: UV light generator 2: Fume hood

[0026] 3: Smoke exhaust duct 4: Smoke exhaust fan

[0027] 5: Light leakage alarm device 51: First sensor

[0028] 51': light source 52: second sensor

[0029] 53: Third sensor 6: Power supply DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings. The described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0031] In order to meet the relevant requirements of the "Electromagnetic Radiation Protection Regulations" (GB87021988) and the "Special Requirements for Antibacterial, Sterilization, Purification Functions and Air Purifiers for Household and Similar Electrical Appliances" (GB21551.3), the ultraviolet light in the smoke hood of the photoelectric purification system will not leak out (including reflected light), and the 8-hour occupational exposure limit will meet the following requirements: irradiance ≤ 0.13μW / cm 2 , irradiation ≤1.8mJ / cm 2 , UV light intensity ≤5μW / cm 2 , the present invention discloses a photoelectric purification system with ultraviolet light leakage alarm function.

[0032] Figure 1 This is a schematic diagram of the structure of a photoelectric purification system of the present invention. Figure 1As shown, in an embodiment of the present invention, a photoelectric purification system is disclosed, including a photodecomposition device 1, a smoke hood 2, a smoke exhaust pipe 3, a smoke exhaust fan 4, a light leakage alarm device 5 and a power supply 6, wherein the smoke hood 2 and the smoke exhaust pipe 3 are connected to form a smoke exhaust channel, the photodecomposition device 1 is arranged at the connection between the smoke hood 2 and the smoke exhaust pipe 3, the photodecomposition device 1 includes a shading plate 11 and an ultraviolet light generator 12, the shading plate 11 is arranged on one side of the smoke hood 2, and blocks the ultraviolet light generated by the ultraviolet light generator 12 to prevent it from leaking to the smoke hood 2, the ultraviolet light generator 12 is arranged on one side of the smoke exhaust pipe 3, and generates ultraviolet light to decompose the pollutant particles of the airflow in the smoke exhaust channel, that is, the airflow containing pollution and no particles is first passed through the ventilation shading plate 11 of the photodecomposition device 1 and then purified by the ultraviolet light generator 12; the ultraviolet lamp of the ultraviolet light generator 12 emits C-segment ultraviolet light when working, and in this embodiment, the wavelength of the C-segment ultraviolet light is specifically 185nm. The exhaust fan 4 is disposed in the exhaust pipe 3 to generate negative pressure so that the oil smoke is collected through the smoke collecting hood 2 and then transported to the photodecomposition device 1. The power supply 6 is electrically connected to the ultraviolet light generator 12 and provides the ultraviolet light generator 12 with a working voltage.

[0033] In order to reduce the risk of ultraviolet light leakage in the C segment as much as possible, the light leakage alarm device 5 of the present invention is provided with multiple sensors and adopts multiple modes to detect the leakage of ultraviolet light. Specifically, the light leakage alarm device 5 includes a first sensor 51 and a second sensor 52 .

[0034] Among them, the first sensor 51 is an ultraviolet light sensor, which only senses the C-segment ultraviolet light emitted by the ultraviolet light generator 12; the first sensor 51 is arranged in the smoke hood 2 and simulates the position of the user's workspace. Since the first sensor 51 only senses the C-segment ultraviolet light, under normal conditions, the first sensor 51 does not work. When the C-segment ultraviolet light leaks, the first sensor 51 senses the C-segment ultraviolet light emitted by the ultraviolet light generator 12, and it can be considered that the shading plate 11 fails, then an alarm is issued, and at the same time, the connection between the ultraviolet light generator 12 and the power supply 6 is cut off, so that the ultraviolet light generator 12 stops working, thereby preventing the C-segment ultraviolet light from leaking to the user's workspace.

[0035] The second sensor 52 is a limit switch, and the mechanical part of the limit switch is connected to the shading plate 11 and the smoke hood 2 respectively; when the shading plate 11 is in the correct installation position, according to the design requirements, the C-segment ultraviolet light should not be leaked, and the limit switch is in the disconnected state; when the shading plate 11 deviates from the installation position, the C-segment ultraviolet light may leak, and the limit switch is turned on to trigger an alarm. The electrical part of the limit switch can also be set to be electrically connected to the power supply 6 and the ultraviolet light generator 12 respectively, and when the shading plate 11 is in the correct installation position, the limit switch is in the on state; when the shading plate 11 deviates from the installation position, the limit switch is disconnected to stop the ultraviolet light generator 12 from working.

[0036] The light leakage alarm device 5 can also include a third sensor 53, which is a light sensor and shields the C-segment ultraviolet light emitted by the ultraviolet light generator 12, that is, it is not sensitive to the C-segment ultraviolet light; the third sensor 53 is arranged in the exhaust duct 3 near the ultraviolet light generator 12. Due to the shielding effect of the sunshade 11, the natural light in the user's workspace will not pass through the sunshade 11 into the smoke exhaust duct 3 under normal conditions. When the third sensor 53 detects visible light, it can be considered that natural light in the user's workspace has entered the exhaust duct 3. Due to the direct and reflected light, it can be considered that the sunshade 11 has failed, and the C-segment ultraviolet light emitted by the ultraviolet light generator 12 may leak into the user's workspace. At this time, an alarm is issued to remind the user to perform ultraviolet light leakage detection, or the ultraviolet light generator 12 is stopped to prevent the C-segment ultraviolet light from leaking into the user's workspace.

[0037] Figure 2 FIG. 1 is a schematic diagram of the structure of a photoelectric purification system according to another embodiment of the present invention. Figure 2As shown, in another embodiment of the present invention, the first sensor 51 can also be a visible light sensor arranged in the smoke hood 2 and capable of sensing light of a specific wavelength band. At the same time, a light source 51' capable of emitting light of a specific wavelength band is arranged near the ultraviolet light generator 12. The light source 51' works synchronously with the ultraviolet light generator 12. When the first sensor 51 senses the light of a specific wavelength band emitted by the light source 51', it can be considered that the shading plate 11 is invalid, and an alarm is given. At the same time, the connection between the ultraviolet light generator 12 and the power supply 6 is cut off, so that the ultraviolet light generator 12 stops working and avoids the leakage of ultraviolet light of segment C. The second sensor 52 is a visible light sensor, and shields the ultraviolet light of segment C emitted by the ultraviolet light generator 12 and the light of a specific wavelength band emitted by the light source 51', that is, it does not sense ultraviolet light of segment C and light of a specific wavelength band. By using a visible light sensor and a corresponding light source, the use of a high-cost ultraviolet light sensor can be avoided to reduce the overall cost of the equipment. In another embodiment of the present invention, the light leakage alarm device 5 may further include a third sensor 53, which is a light sensor and shields the C-segment ultraviolet light emitted by the ultraviolet light generator 12 and the specific band light emitted by the light source 51', that is, it is not sensitive to the C-segment ultraviolet light and the specific band light; the third sensor 53 is arranged in the exhaust duct 3 near the ultraviolet light generator 12. Due to the shielding effect of the sunshade 11, the natural light in the user's workspace will not pass through the sunshade 11 into the smoke exhaust duct 3 under normal conditions. When the third sensor 53 detects visible light, it can be considered that natural light in the user's workspace is emitted into the exhaust duct 3. Due to the direct and reflected effects of the light, it can be considered that the sunshade 11 fails, and the C-segment ultraviolet light emitted by the ultraviolet light generator 12 may leak into the user's workspace. At this time, an alarm is issued to remind the user to perform ultraviolet light leakage detection, or the ultraviolet light generator 12 is stopped to prevent the C-segment ultraviolet light from leaking into the user's workspace.

[0038] The present invention also discloses a method for preventing ultraviolet light leakage in a photoelectric purification system. To prevent ultraviolet light leakage when the photoelectric purification system is working, the present invention adopts an ultraviolet light leakage alarm mode, which specifically includes:

[0039] Step S1, turning on the power to start the light decomposition device and the smoke exhaust fan, and at the same time start the light leakage alarm device;

[0040] Step S2, when the first sensor detects the leakage of the ultraviolet rays in the C section, an alarm is sounded, and the power supply is cut off to stop the light decomposition device from working;

[0041] Step S3, when the second sensor detects that the shading plate deviates from the safe position, an alarm is issued;

[0042] Step S4: When the third sensor detects natural light entering the user's workspace, an alarm is issued.

[0043] The description and application of the present invention are illustrative and are not intended to limit the scope of the present invention to the above-described embodiments. Variations and modifications of the embodiments disclosed herein are possible, and replacements of the embodiments and various equivalent components are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the present invention may be implemented in other forms, structures, arrangements, proportions, and with other components, materials, and parts without departing from the spirit or essential characteristics of the present invention. Thus, the present invention is intended to include such modifications and variations if they fall within the scope of the claims and their equivalents.

Claims

1. A photoelectric purification system, comprising a smoke hood, a smoke exhaust pipe, a photodecomposition device and a power supply, wherein the smoke hood and the smoke exhaust pipe are connected to each other to form a smoke exhaust channel; the photodecomposition device is arranged at the connection between the smoke hood and the smoke exhaust pipe, and the photodecomposition device comprises an ultraviolet light generator and a shading plate, wherein the ultraviolet light generator is arranged at one side of the smoke exhaust pipe to generate ultraviolet light to decompose pollutant particles in the airflow in the smoke exhaust channel, and the shading plate is arranged at one side of the smoke hood to shield the ultraviolet light to prevent it from leaking into the smoke hood; the power supply is electrically connected to the ultraviolet light generator and provides a working voltage for the ultraviolet light generator; It is characterized in that It also includes a light leakage alarm device, which includes a first sensor and a second sensor, the first sensor is arranged in the smoke hood, and the second sensor is arranged at the connection between the smoke hood and the shading plate; And a light source emitting light of a specific wavelength band, the light source is arranged in close proximity to the ultraviolet light generator, the first sensor is a light sensor that only detects light of the specific wavelength band, when the first sensor detects the light of the specific wavelength band, an alarm is issued and the power supply is cut off.

2. The photoelectric purification system according to claim 1, characterized in that: The second sensor comprises a limit switch, the mechanical part of which is respectively connected to the shading plate and the smoke collecting hood. When the shading plate deviates from the installation position, the limit switch starts an alarm.

3. The photoelectric purification system according to claim 1, characterized in that: The light leakage alarm device also includes a third sensor arranged in the smoke exhaust duct. The third sensor is an optical sensor for detecting light of different wavelengths. The light of different wavelengths is in a wavelength band other than the wavelength band of the ultraviolet light and the light of the specific wavelength band. When the third sensor detects the light of different wavelengths, an alarm is issued.

4. The photoelectric purification system according to claim 1, characterized in that: The ultraviolet light generator emits C-segment ultraviolet light when in operation, and the wavelength of the C-segment ultraviolet light is 185nm.

5. The photoelectric purification system according to claim 1, characterized in that: It also includes a smoke exhaust fan, which is arranged in the smoke exhaust duct and is used to generate negative pressure to make the air flow flow in the smoke exhaust channel.

6. A method for ultraviolet light leakage alarm of a photoelectric purification system according to any one of claims 1 to 5, characterized in that: include: Turning on the power supply makes the ultraviolet light generator of the photodecomposition device emit ultraviolet light; The light leakage alarm device comprises a light source emitting light of a specific wavelength band, and the light source is arranged in close proximity to the ultraviolet light generator so that the light source emits light of a specific wavelength band; When the light leakage alarm device detects the light of the specific wavelength band, an alarm is issued and the power supply is cut off.

7. The ultraviolet light leakage alarm method according to claim 6, characterized in that: The light leakage alarm device comprises a first sensor and a second sensor. The first sensor is arranged in the smoke collecting hood, and the second sensor is arranged at the connection between the smoke collecting hood and the shading plate.

8. The ultraviolet light leakage alarm method according to claim 7, characterized in that: The second sensor comprises a limit switch, the mechanical part of which is respectively connected to the light shielding plate of the light decomposition device and the smoke collecting hood of the photoelectric purification system; When the shading plate deviates from the installation position, the limit switch activates an alarm.

9. The ultraviolet light leakage alarm method according to claim 7, characterized in that: The first sensor is a light sensor that only detects light of the specific wavelength band; When the first sensor detects the light of the specific wavelength band, an alarm is issued and the power supply is cut off.

10. The ultraviolet light leakage alarm method according to claim 9, characterized in that: The light leakage alarm device further comprises a third sensor disposed in the smoke exhaust duct, the third sensor being a light sensor for detecting light of different wavelengths, the light of different wavelengths being in a wavelength band other than the wavelength bands of the ultraviolet light and the light of the specific wavelength band; When the third sensor detects the light of the different wavelength band, an alarm is issued.

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