Online oil smoke detection device

Abstract

The utility model discloses an on-line oil smoke detection device which comprises a light source, a detection unit and a reflection unit which are respectively arranged on two sides of an oil smoke monitoring area, the reflection unit is sealed and is internally provided with a first reflection prism; the light source and detection unit is sealed and is internally provided with a light source, a grating assembly capable of switching a reflection or transmission function, a second reflection prism and light detection equipment; when the grating assembly is switched to a reflection function, the light source, the grating assembly, the first reflection prism, the second reflection prism and the light detection equipment form a reflection detection light path; when the grating assembly is switched to a transmission function, the light source, the grating assembly, the second reflecting prism and the light detection equipment form a transmission reference light path; the opposite surfaces of the light source and detection unit and the reflection unit are respectively provided with a first protection window and a second protection window through which reflected detection light can penetrate. The oil smoke detection device can solve the problem that an existing oil smoke detection device is difficult to use for a long time in a heavy oil smoke scene.

Description

Technical Field

[0001] The utility model relates to the technical field of oil smoke detection, in particular to an online oil smoke detection device. Background Art

[0002] At present, the main methods for online detection of oil fume concentration include metal oxide electrode detection method, light scattering method, etc. The system adopts pump-suction air intake, and the pump-suction air intake method has a short time to maintain normal operation of the pipeline under heavy oil fume conditions.

[0003] In the metal oxide electrode detection method, the gas contacts the electrode to generate an electrical signal, and the metal oxide is used to catalyze the oxidation of the oil fume components. Since the oil fume components contain some elements that cannot be oxidized into gas, such as metals, chlorine, silicon, etc., their lifespan is limited.

[0004] The light scattering method is a non-contact detection method. Some existing detection modules that may come into contact with the gas are protected by sheath gas to extend the service life of key components. However, it is difficult to maintain long-term use in heavy oil fume scenarios, especially in the printing and dyeing industry, which has typical high temperature, high humidity, high oil fume and particulate matter concentrations. Currently, no detection system has been able to achieve long-term effective operation.

[0005] The light scattering method includes forward light scattering method and backward light scattering method. For example, the patent specification with the announcement number CN207336308U discloses an optical backscattering oil fume concentration monitor. In addition, the patent specification with the announcement number CN218956353U discloses an anti-pollution device for an oil fume sensor, which is arranged on the side wall of the flue, including a light tunnel and an optical sensor, and the light tunnel is vertically connected to the side wall of the flue; the optical sensor is fixedly connected to the end of the light tunnel, and also includes a baffle, which is fixedly connected to the inner wall of the flue close to the light tunnel, so as to prevent oil fume from entering the light tunnel and avoid oil fume particles from adhering to the lens surface of the sensor, thereby ensuring the detection effect and improving the service life of the detection device. Utility Model Content

[0006] The utility model provides an online oil fume detection device, which can solve the problem that the existing oil fume detection device is difficult to use for a long time in heavy oil fume scenes. The light source, detection equipment, grating components and other components are packaged on one side to improve the system integration.

[0007] The specific technical solutions are as follows:

[0008] An online oil fume detection device comprises a light source and a detection unit and a reflection unit respectively arranged on both sides of an oil fume monitoring area;

[0009] The reflection unit is sealed, and a first reflection prism is arranged inside the reflection unit;

[0010] The light source and detection unit are sealed, and a light source, a grating component with switchable reflection or transmission function, a second reflection prism and a light detection device are arranged inside the unit; when the grating component is switched to the reflection function, the light source, the grating component, the first reflection prism, the second reflection prism and the light detection device constitute a reflection detection optical path; when the grating component is switched to the transmission function, the light source, the grating component, the second reflection prism and the light detection device constitute a transmission reference optical path;

[0011] A first protective window and a second protective window for reflecting and detecting light to pass through are respectively arranged on opposite surfaces of the light source, the detecting unit and the reflecting unit.

[0012] When the above-mentioned online oil fume detection device is working, the light detection device receives the transmitted reference light and the reflected detection light in turn, and compares the characteristics such as light intensity to obtain the oil fume concentration and other conditions.

[0013] The switching of the reflection or transmission function of the grating component can be achieved by rotating or pushing and pulling. For example, one part of the side of the grating component facing the light source is a transparent glass, and the other part is a reflective surface. By rotating the grating component to change the position of the light source on the grating component (on the reflective surface or the transparent glass part), the switching of the reflection or transmission function can be achieved. For another example, the grating component includes a reflective mirror. When the reflection function is required, the reflective mirror is pointed at the light source. When the transmission function is required, the reflective mirror is pushed and pulled to allow light to pass through.

[0014] In one embodiment, the online oil fume detection device further includes a first reflection detection optical path channel, and the first reflection detection optical path channel is arranged at a side of the light source and the detection unit corresponding to the first protective window.

[0015] In one embodiment, one end of the first reflection detection optical path channel is connected to the first protection window, and the other end is opened toward the side of the oil fume monitoring area close to the light source and the detection unit.

[0016] In one embodiment, the first reflection detection optical path is connected to the first compressed air pipe, which is used to connect compressed air. This design can introduce compressed air to form positive pressure gas protection to prevent oil smoke from entering the component.

[0017] In one embodiment, a first heating component (specifically, electric heating, etc.) is provided near the other end of the first reflection detection optical path channel, which is used to heat the first reflection detection optical path channel near the other end to above the boiling point of the oil fume in the oil fume monitoring area. The above design utilizes the high-temperature volatilization characteristics of oil fume, and sets the high-temperature operation mode of the optical path protection element (heating component) in the polluted area, thereby solving the problem of oil fume accumulation and adhesion.

[0018] In one embodiment, the online oil fume detection device further includes a second reflection detection optical path channel, and the second reflection detection optical path channel is arranged on the side of the reflection unit corresponding to the second protective window.

[0019] In one embodiment, one end of the second reflection detection optical path channel is connected to the second protection window, and the other end is opened toward the side of the oil fume monitoring area close to the reflection unit.

[0020] In one embodiment, the side of the second reflection detection optical path is connected to a second compressed air pipe, and the second compressed air pipe is used to connect compressed air. This design can introduce compressed air to form positive pressure gas protection to prevent oil smoke from entering the component.

[0021] In one embodiment, a second heating component (specifically, electric heating, etc.) is provided near the other end of the second reflection detection optical path channel, which is used to heat the second reflection detection optical path channel near the other end to above the boiling point of the oil fume in the oil fume monitoring area. The above design utilizes the high-temperature volatilization characteristics of oil fume, sets the high-temperature operation mode of the optical path protection element (heating component) in the polluted area, and solves the problem of oil fume accumulation and adhesion.

[0022] In one embodiment, the light source, the detection unit and the reflection unit are connected to form a whole with adjustable spacing through a connecting piece (specifically, a bracket, etc.), so that they can be used as an integral product in oil fume monitoring areas of different sizes.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1) The light scattering method is used to directly detect the target area, without pump suction pipelines, and the oil smoke does not pollute the detection components;

[0025] 2) All optical path components are installed in a closed structure, and there is no pollution source in the optical path;

[0026] 3) A rotating or movable reflection / transmission grating assembly can be used to achieve optical path switching. The detection light and the reference light are from the same light source and are projected into the same detection device, thus avoiding detection errors caused by performance attenuation of the light source (such as laser, etc.) and the detection device;

[0027] 4) The light paths are switched and both are incident on the same prism (second reflecting prism), and the total reflection surface at a special angle enables both light paths to reach the detection equipment in the forward direction;

[0028] 5) The first reflecting prism can use a right-angle prism to achieve regular reflection, so that the light source, grating assembly, second reflecting prism, light detection equipment and other components can be packaged on the same side, which is conducive to the small modularization of key components;

[0029] 6) The protective window and the reflection detection optical path can be protected by positive pressure clean air (such as filtered compressed air, etc.) to prevent external oil smoke from entering and contaminating the components;

[0030] 7) The reflection detection optical path channel can be made of electric heating and ceramic or stainless steel. The electric heating temperature is higher than the boiling point of typical oil fume substances in the target scene (generally 150-200°C), and the oil fume is difficult to adhere to the exposed surface of the detection equipment, greatly reducing maintenance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an online oil smoke detection device in a specific implementation manner;

[0032] Figure 2 It is a schematic diagram of the reflection detection optical path of the online oil smoke detection device in a specific implementation manner;

[0033] Figure 3 It is a schematic diagram of the transmission reference light path of the online oil fume detection device in a specific implementation manner. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0035] See also Figures 1 to 3 An online oil fume detection device includes a light source and detection unit 1 and a reflection unit 3 respectively arranged on both sides of an oil fume monitoring area 2. The light source and detection unit 1 and the reflection unit 3 are connected to form an integral body with adjustable spacing through a connecting member 9 (specifically, a bracket, etc.), so that the integral product can be applied to oil fume monitoring areas 2 of different sizes.

[0036] The reflection unit 3 is sealed, and a first reflection prism 4 is arranged inside the reflection unit 3 .

[0037] The light source and detection unit 1 is sealed, and a light source 10 , a grating component 11 with switchable reflection or transmission function, a second reflection prism 12 and a light detection device 13 are arranged inside the unit.

[0038] When the grating assembly 11 is switched to the reflection function, see Figure 2 The light source 10, the grating assembly 11, the first reflecting prism 4, the second reflecting prism 12 and the light detecting device 13 constitute a reflecting detecting light path.

[0039] When the grating assembly 11 is switched to the transmission function, see Figure 3 The light source 10, the grating assembly 11, the second reflecting prism 12 and the light detecting device 13 constitute a transmission reference light path.

[0040] A first protective window 51 and a second protective window 52 are respectively disposed on the opposite surfaces of the light source and detection unit 1 and the reflection unit 3 so as to allow the reflected detection light to pass through.

[0041] A first reflection detection optical path channel 81 is provided on the side of the light source and detection unit 1 corresponding to the first protective window 51. One end of the first reflection detection optical path channel 81 is connected to the first protective window 51, and the other end is open toward the side of the oil fume monitoring area 2 close to the light source and detection unit 1. The first reflection detection optical path channel 81 is connected to the first compressed air pipe 71 on the side, and the first compressed air pipe 71 is used for external compressed air. A first heating component 61 (specifically, it can be an electric heater, etc.) is provided near the other end of the first reflection detection optical path channel 81, which is used to heat the first reflection detection optical path channel 81 near the other end to above the boiling point of the oil fume substance in the oil fume monitoring area 2.

[0042] A second reflection detection optical path channel 82 is provided on the side of the reflection unit 3 corresponding to the second protective window 52. One end of the second reflection detection optical path channel 82 is connected to the second protective window 52, ​​and the other end is open toward the side of the oil fume monitoring area 2 close to the reflection unit 3. The second reflection detection optical path channel 82 is connected to the second compressed air pipe 72 on the side, and the second compressed air pipe 72 is used for external compressed air. A second heating component 62 (specifically, electric heating, etc.) is provided near the other end of the second reflection detection optical path channel 82, which is used to heat the second reflection detection optical path channel 82 near the other end to above the boiling point of the oil fume substance in the oil fume monitoring area 2.

[0043] The first protective window 51, the second protective window 52, ​​the first reflection detection optical path channel 81, and the second reflection detection optical path channel 82 are protected by positive pressure clean compressed air to prevent external oil smoke from entering and polluting the components. The first reflection detection optical path channel 81 and the second reflection detection optical path channel 82 are electrically heated and made of ceramic or stainless steel. The electric heating temperature is higher than the boiling point of typical oil smoke substances in the target scene (generally 150-200°C), so it is difficult for oil smoke to adhere to the exposed surface of the detection equipment, greatly reducing maintenance requirements.

[0044] When the above-mentioned online oil fume detection device is working, the light detection device 13 receives the transmitted reference light and the reflected detection light in turn, and compares the characteristics such as light intensity to obtain the oil fume concentration and other conditions.

[0045] Specifically, the switching of the reflection or transmission function of the grating component 11 can be achieved by rotating or pushing and pulling. For example, a part of the side of the grating component 11 facing the light source is a transparent glass, and a part is a reflective surface. By rotating the grating component 11 to change the position of the light source on the grating component 11 (on the reflective surface or the transparent glass part), the switching of the reflection or transmission function can be achieved. For another example, the grating component 11 includes a reflective mirror. When the reflection function is required, the reflective mirror is aligned with the light source. When the transmission function is required, the reflective mirror is pushed and pulled to allow light to pass through.

[0046] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. An online oil fume detection device, characterized in that: It comprises a light source and a detection unit (1) and a reflection unit (3) respectively arranged on both sides of an oil smoke monitoring area (2); The reflection unit (3) is sealed, and a first reflection prism (4) is arranged inside the reflection unit; The light source and detection unit (1) is sealed, and a light source (10), a grating component (11) capable of switching between reflection and transmission functions, a second reflection prism (12), and a light detection device (13) are arranged inside the unit; when the grating component (11) is switched to the reflection function, the light source (10), the grating component (11), the first reflection prism (4), the second reflection prism (12), and the light detection device (13) form a reflection detection optical path; when the grating component (11) is switched to the transmission function, the light source (10), the grating component (11), the second reflection prism (12), and the light detection device (13) form a transmission reference optical path; A first protective window (51) and a second protective window (52) for allowing reflected detection light to pass through are respectively arranged on opposite surfaces of the light source and detection unit (1) and the reflection unit (3).

2. The online oil smoke detection device according to claim 1, characterized in that: The online oil fume detection device further comprises a first reflection detection light path channel (81), and the first reflection detection light path channel (81) is arranged on the side of the light source and detection unit (1) corresponding to the first protection window (51).

3. The online oil smoke detection device according to claim 2 is characterized in that: One end of the first reflection detection optical path channel (81) is connected to the first protection window (51), and the other end is open toward the side of the oil fume monitoring area (2) close to the light source and the detection unit (1).

4. The online oil smoke detection device according to claim 3 is characterized in that: The side of the first reflection detection optical path channel (81) is connected to the first compressed air pipe (71), and the first compressed air pipe (71) is used for externally connecting compressed air.

5. The online oil smoke detection device according to claim 3 or 4, characterized in that: A first heating component (61) is provided near the other end of the first reflection detection optical path channel (81) for heating the first reflection detection optical path channel (81) near the other end to a temperature above the boiling point of the oil fume substance in the oil fume monitoring area (2).

6. The online oil smoke detection device according to claim 1, characterized in that: The online oil fume detection device further comprises a second reflection detection optical path channel (82), and the second reflection detection optical path channel (82) is arranged on the side of the reflection unit (3) corresponding to the second protection window (52).

7. The online oil smoke detection device according to claim 6, characterized in that: One end of the second reflection detection optical path channel (82) is connected to the second protective window (52), and the other end is open toward the side of the oil fume monitoring area (2) close to the reflection unit (3).

8. The online oil smoke detection device according to claim 7, characterized in that: The side of the second reflection detection optical path channel (82) is connected to the second compressed air pipe (72), and the second compressed air pipe (72) is used for external compressed air.

9. The online oil smoke detection device according to claim 7 or 8, characterized in that: A second heating component (62) is provided near the other end of the second reflection detection optical path channel (82) for heating the second reflection detection optical path channel (82) near the other end to a temperature above the boiling point of the oil fume substance in the oil fume monitoring area (2).

10. The online oil smoke detection device according to claim 1, characterized in that: The light source and detection unit (1) and the reflection unit (3) are connected to form a whole with adjustable spacing via a connecting piece (9).

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