CN219161921U

CN219161921U - Lampblack sensor and range hood using same

Info

Publication number: CN219161921U
Application number: CN202320030529.2U
Authority: CN
Inventors: 李宗毅; 许方华; 杨川; 曹亮
Original assignee: Chengdu Pulse Optics Tech Co ltd; Chengdu Senshi Optical Technology Co ltd
Current assignee: Chengdu Pulse Optics Tech Co ltd; Chengdu Senshi Optical Technology Co ltd
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-06-09
Anticipated expiration: 2033-01-06

Abstract

The utility model discloses a lampblack sensor, which comprises a shell, wherein a light-emitting element for emitting infrared light and a photosensitive element for receiving light reflected or refracted by lampblack particles are arranged in the shell, an optical collimating lens and an optical condensing lens are embedded on the shell, the optical collimating lens converts the infrared light emitted by the light-emitting element into light beams, the optical condensing lens focuses the light reflected or refracted by the lampblack particles onto the photosensitive element, an anti-pollution bracket is further arranged on one side of the shell, the shape of the anti-pollution bracket is cone-shaped, an optical path channel matched with the shape of the anti-pollution bracket is arranged in the anti-pollution bracket, the larger end of the optical path channel is detachably and movably connected with the shell, and the smaller end of the optical path channel is an opening for emitting the light beams or receiving the light. The utility model also discloses a range hood provided with the oil smoke sensor. The oil smoke sensor provided by the utility model has the advantages of long detection distance, wide detection range, more accurate detection result, difficulty in being polluted by oil smoke and capability of improving the use experience of a user on the range hood.

Description

Lampblack sensor and range hood using same

Technical Field

The utility model relates to the technical field of oil smoke detection devices, in particular to an oil smoke sensor and an oil smoke ventilator using the same.

Background

A range hood is a kitchen appliance that purifies the kitchen environment. The existing range hood is provided with the corresponding oil smoke sensor, and the oil smoke sensor is utilized to detect the oil smoke concentration in real time, so that the automatic adjustment and control of the air quantity of the range hood are realized, the use experience of a user of the range hood is improved, meanwhile, the electric energy is saved, and the intelligent use of the household appliance is promoted.

The traditional oil smoke sensor is usually arranged on the smoke collecting cover, and the current oil smoke sensor mostly adopts the infrared light scattering principle to achieve the aim of identifying oil smoke particles, so that the detection area and the detection limit of the oil smoke sensor can only realize detection when oil smoke passes through a sensor detection point or line, and in a real range hood, the oil smoke distribution is not concentrated, and the oil smoke concentration is difficult to truly reflect. In addition, the infrared light sensor is very easy to be interfered by visible light, so that the oil smoke sensor is arranged in the internal environment of the range hood, and the oil smoke sensor exposed in the internal environment of the range hood is easy to be polluted by oil smoke, so that the detection result of the oil smoke sensor is not ideal, misoperation and frequent gear switching of the range hood are caused in many times, and the popularization and the use of the oil smoke sensor in the range hood are seriously influenced.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide the oil smoke sensor which has the advantages of long detection distance, wide detection range, more accurate detection result and difficult pollution by oil smoke.

Another object of the present utility model is to provide a range hood using the above-mentioned range hood sensor.

In order to achieve the above purpose, the present utility model is realized by the following technical scheme: the utility model provides a lampblack sensor, includes the shell, be provided with the light emitting component of emission infrared light in the shell, receive lampblack particle reflection or refractive light's photosensitive element, inlay on the shell and be equipped with optical collimating lens and optical condensing lens, optical collimating lens turns the infrared light of light emitting component emission into the light beam, optical condensing lens focuses the lampblack particle reflection or refractive light to photosensitive element on, anti-pollution support is still installed to shell one side, anti-pollution support's appearance is the cone form, its inside is provided with the light path passageway with its appearance assorted, the great one end of light path passageway can dismantle swing joint with the shell, and less one end is the opening of emission light beam or receipt light.

The working principle of the technical scheme is as follows: through addding optical collimating lens for the infrared light that luminescent element sent becomes the light beam, so increased and detected smog degree of depth and breadth, thereby improved the precision that the oil smoke detected, make this oil smoke sensor can carry out accurate detection to real-time oil smoke concentration. The cone-shaped anti-pollution bracket is arranged, so that external oil smoke can be prevented from entering through the opening of the anti-pollution bracket to a great extent by utilizing the principle of a flask, and the detection precision is affected by pollution to internal functional devices. In addition, the wavelength of infrared light emitted by the light-emitting element in the technical scheme is 946nm, the infrared light is invisible to naked eyes of a person, and the light-emitting element and the photosensitive element are deeply hidden in the oil smoke prevention frame, so that the light-emitting element and the photosensitive element are not easily influenced by external light, the influence of external environment visible light on the smoke sensor is avoided, and the detection precision is further improved.

In order to better realize the utility model, the shell is further embedded with a protection sheet for preventing the optical collimating lens and the optical condensing lens from being polluted, and the protection sheet is arranged between the anti-pollution bracket and the optical collimating lens and the optical condensing lens.

In order to better realize the present utility model, further, a pressing cover for fixing the optical collimating lens and the optical condensing lens to the housing is further included, the pressing cover being interposed between the protective sheet and the optical collimating lens and the optical condensing lens.

In order to better realize the utility model, further, the light emitting element and the photosensitive element are both arranged on the PCBA board and are both positioned on the same side of the PCBA board, the distance between the light emitting element and the photosensitive element is 5-10 mm, the PCBA board is fixedly arranged in the shell, the PCBA board is provided with a light emitting driving circuit, a signal processing circuit, a microprocessor and a control cable, the microprocessor controls the light emitting element to emit infrared light through the light emitting driving circuit, the microprocessor also controls the photosensitive element to convert the light signal into an electric signal through the signal processing circuit, the microprocessor also obtains the oil smoke concentration through calculating the electric signal and outputs a control signal through the control cable, and the control cable also provides power supply for the normal operation of the PCBA board.

In order to better realize the utility model, further, the bottom of the shell is also provided with a bottom cover detachably connected with the shell, and a shielding cover is arranged between the bottom cover and the PCBA board.

In order to better realize the utility model, the shell and the anti-pollution bracket are further fixed through fastening screws, and the bottom cover, the shielding cover and the PCBA board are fixed with the shell through long screws penetrating through the bottom cover, the shielding cover and the PCBA board.

In order to better realize the utility model, the optical collimating lens further converts the infrared light emitted by the light emitting element into a cylindrical parallel light beam, and the diameter of the cylindrical parallel light beam is 6-8mm.

In order to better realize the utility model, further, a fence is arranged in the middle of the light path channel in the anti-pollution bracket, a through hole for ensuring the smoothness of the light path channel is arranged in the middle of the fence, and the shape of the through hole is that two circles intersect.

In order to better realize the utility model, the distance between the fence and the protection sheet is 15-25 mm, and the distance between the fence and the opening at the smaller end of the anti-pollution bracket is 20-30 mm.

The technical scheme also provides a range hood, wherein the range hood is provided with the range hood sensor according to any one of claims at the right lower part of the turbine air inlet of the range hood, and an included angle between a light beam emitted by the range hood sensor and a plane where the range hood is located is 5-45 degrees.

Compared with the prior art, the utility model has the following advantages:

(1) According to the utility model, the optical collimating lens is additionally arranged, so that the infrared light emitted by the light emitting element is changed into the light beam, and the detection of the depth and the breadth of smoke is increased, so that the precision of the detection of the smoke is improved, and the smoke sensor can accurately detect the concentration of the real-time smoke;

(2) According to the utility model, the cone-shaped anti-pollution bracket is arranged, so that external oil smoke can be prevented from entering through the opening of the anti-pollution bracket to a great extent by utilizing the principle of a flask, and the detection precision is influenced by polluting internal functional devices;

(3) The smoke sensor provided by the utility model has a completely sealed structure, so that the influence of the external environment on components in the smoke sensor can be avoided to the greatest extent, the service life of the smoke sensor can be effectively prolonged, and the maintenance or repair cost of the smoke sensor is reduced;

(4) According to the utility model, the smoke sensor has stronger pollution resistance by optimizing the mounting position of the smoke sensor on the range hood, and can more effectively and sensitively detect the smoke, so that the use experience of a user on the range hood is further improved, and the smoke sensor is suitable for wide popularization and application.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

fig. 1 is a schematic diagram of the working principle of the oil smoke sensor in the utility model

FIG. 2 is a schematic diagram of an exploded structure of a smoke sensor according to the present utility model;

FIG. 3 is a cross-sectional view of a smoke sensor according to the present utility model;

FIG. 4 is a left side view of the smoke sensor of the present utility model;

fig. 5 is a schematic structural diagram of a range hood according to the present utility model.

Wherein: 1-shell, 2-luminous element, 3-photosensitive element, 4-optical collimating lens, 5-optical condensing lens, 6-anti-pollution bracket, 61-fence, 7-protection sheet, 8-PCBA board, 9-control cable, 10-bottom cover, 11-shielding cover, 12-gland, 13-fastening screw, 14-long screw and 15-fume particles.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; or may be directly connected, or may be indirectly connected through an intermediate medium, or may be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1:

the main structure of this embodiment, as shown in fig. 2 and 3, includes a housing 1, a light emitting element 2 for emitting infrared light is disposed in the housing 1, and a photosensitive element 3 for receiving light reflected or refracted by the soot particles 15 is disposed in the housing 1, and is characterized in that an optical collimating lens 4 and an optical condensing lens 5 are embedded in the housing 1, the infrared light emitted by the light emitting element 2 is changed into light beams by the optical collimating lens 4, the light reflected or refracted by the soot particles 15 is focused onto the photosensitive element 3 by the optical condensing lens 5, an anti-pollution bracket 6 is also mounted on one side of the housing 1, the shape of the anti-pollution bracket 6 is cone-shaped, an optical path channel matched with the shape of the anti-pollution bracket is disposed in the anti-pollution bracket 6, and a larger end of the optical path channel is detachably and movably connected with the housing 1, and a smaller end of the optical path channel is an opening for emitting light beams or receiving light.

The specific working principle of the oil smoke sensor is shown in fig. 1, the light-emitting element 2 emits light, the light is changed into a beam after passing through the optical collimating lens 4, the beam irradiates to an oil smoke activity area after passing through the oil smoke pollution prevention support 6, when oil smoke particles 15 pass through the beam, reflected and refracted light is generated, the reflected and refracted light sequentially passes through the oil smoke pollution prevention support 6, passes through the optical condensing lens 5, the reflected and refracted light is focused on the photosensitive element 3 and is converted into a weak electric signal, and the oil smoke concentration is obtained after calculation through a signal processing circuit and complex software according to the intensity of the electric signal. The light-emitting element 2 is controlled by a microprocessor through a light-emitting driving circuit, the photosensitive element 3 is controlled by the microprocessor through a signal processing circuit, the light signals are converted into electric signals, and the microprocessor also calculates the electric signals to obtain the lampblack concentration. The arrangement of the optical collimating lens 4 enables infrared light emitted by the light emitting element to be changed into light beams, so that the detection of the depth and the breadth of smoke is increased, the precision of smoke detection is improved, and the smoke sensor can accurately detect the concentration of real-time smoke. The anti-pollution bracket 6 can prevent external oil smoke from entering through the opening of the anti-pollution bracket to a great extent, pollute internal functional devices and influence detection precision.

Example 2:

on the basis of the embodiment, the protection sheet is further added, the protection sheet 7 for preventing the optical collimating lens 4 and the optical condensing lens 5 from being polluted is further embedded on the shell 1, and the protection sheet 7 is arranged between the anti-pollution bracket 6 and the optical collimating lens 4 and the optical condensing lens 5. The protective sheet 7 is adhered to the housing 1, and can further block the external soot from contaminating the optical collimator lens 4 and the optical condenser lens 5. The protection sheet 7 is made of a light-transmitting material, the light transmittance is more than 90%, and the smoothness of the light path channels of the optical collimating lens 4 and the optical condensing lens 5 is not affected. Further, cleaning of the protective sheet 7 is easier than cleaning of the optical collimator lens 4 and the optical condensing lens 5. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

Example 3:

the present embodiment further includes, on the basis of the above embodiment, a pressing cover 12, as shown in fig. 2 and 3, a pressing cover 12 for fixing the optical collimating lens 4 and the optical condensing lens 5 on the housing 1, where the pressing cover 12 is disposed between the protective sheet 7 and the optical collimating lens 4 and the optical condensing lens 5. The optical collimator lens 4 and the optical condensing lens 5 are integrally formed and are fitted to the housing 1, and the cover 12 can further fix the optical collimator lens 4 and the optical condensing lens 5 to the housing 1. In addition, through holes matched with the optical collimating lens 4 and the optical condensing lens 5 are arranged in the middle of the optical collimator, so that the optical paths of the optical collimating lens 4 and the optical condensing lens 5 are not blocked. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

Example 4:

the embodiment further defines the structure inside the casing 1 on the basis of the above embodiment, as shown in fig. 2 and 3, the light emitting element 2 and the photosensitive element 3 are both installed on the PCBA board 8 and are both located on the same side of the PCBA board 8, the distance between the light emitting element 2 and the photosensitive element 3 is 5-10 mm, the mutual influence of light paths between the light emitting element 2 and the photosensitive element 3 is avoided, the PCBA board 8 is fixedly installed inside the casing 1, the PCBA board 8 is provided with a light emitting driving circuit, a signal processing circuit, a microprocessor and a control cable 9, the microprocessor controls the light emitting element 2 to emit infrared light through the light emitting driving circuit, the microprocessor controls the photosensitive element 3 to convert the light signal into an electrical signal through the signal processing circuit, the microprocessor also obtains the oil smoke concentration through calculating the electrical signal, and outputs the control signal through the control cable 9, and the control cable 9 also provides power supply for the normal operation of the PCBA board 8. The control cable 9 is soldered to the PCBA board and extends from the opposite side of the housing 1 to the anti-contamination bracket 6. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

Example 5:

the present embodiment further defines the structure of the housing 1 on the basis of the foregoing embodiment, as shown in fig. 2 and fig. 3, a bottom cover 10 detachably connected to the housing 1 is further disposed at the bottom of the housing 1, and a shielding cover 11 is disposed between the bottom cover 10 and the PCBA board 8. The gap between the bottom cover 10 and the shell 1 is reserved with a glue dispensing groove, and sealant is applied after the sensor is assembled, so that the tightness of the whole sensor is ensured, and the sensor is not influenced by kitchen smoke and water vapor. The shielding case 11 is provided to avoid adverse effects of external electromagnetic waves on the functional devices and circuit elements on the PCBA board 8. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

Example 6:

in this embodiment, the connection manner between the housing 1 and other structures is further limited on the basis of the above embodiment, as shown in fig. 2 and 3, the housing 1 and the anti-pollution bracket 6 are fixed by fastening screws 13, and the bottom cover 10, the shielding cover 11, and the PCBA board 8 are fixed to the housing 1 by long screws 14 penetrating the three. The anti-pollution support 6 both sides are provided with the screw mounting hole, and shell 1 both sides are provided with the fixed ear that matches with it, and fastening screw 13 runs through the fixed ear, with screw mounting hole threaded connection for anti-pollution support 6 realizes detachable fixed connection with shell 1. Four corners of the bottom cover 10 are provided with screw mounting seats, the shielding cover 11 and the PCBA board 8 are provided with threaded through holes matched with the screw mounting seats, the inner side of the shell 1 is also provided with corresponding screw mounting seats, four long screws 14 respectively penetrate through the bottom cover 10, the shielding cover 11 and the PCBA board 8 and are finally in threaded connection with the screw mounting seats on the inner side of the shell 1, and the bottom cover 10, the shielding cover 11 and the PCBA board 8 are all fixed with the shell 1. The shell 1 is connected with other structures through the fastening screw 13 or the long screw 14, so that the fastening and sealing can be ensured, the detachable fixation can be realized, and the later maintenance is more convenient. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

Example 7:

the present embodiment further defines, on the basis of the above-described embodiments, a shape in which the light emitting element 2 emits infrared light into a light beam by the optical collimator lens 4, the optical collimator lens 4 converting the infrared light emitted by the light emitting element 2 into a cylindrical parallel light beam having a diameter of 6 to 8mm. The infrared light collected by the optical collimating lens 4 is a ray, and can be emitted to infinity theoretically, so long as smoke particles in the light beam pass through, the infrared light can be detected, the detection distance is farther, and the control range is wider. The preferred beam shape is a cylindrical parallel beam, and other beam shapes can be selected under the condition of realizing the same detection, and the condensing shape of the optical collimating lens 4 is only required to be adjusted, such as a triangle, a square, a rectangle, a trapezoid and other parallel beams. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

Example 8:

the present embodiment further defines the structure of the anti-pollution support 6 on the basis of the above embodiment, as shown in fig. 3 and 4, a fence 61 is disposed in the middle of the optical path channel in the anti-pollution support 6, a through hole for ensuring the smooth optical path channel is disposed in the middle of the fence 61, and the through hole is in a shape that two circles intersect. The purpose of adding the fence 61 is to further prevent external oil smoke from entering through the opening at the front end of the anti-pollution bracket 6, and the through hole in the middle of the fence 61 ensures the smoothness of the light path channel, and the light-sensitive element 3 cannot influence the detection of the reflected light or the refracted light of the oil smoke due to the arrangement of the optical condensing lens 5. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

Example 9:

according to the embodiment, on the basis of the embodiment, the position of the fence 61 in the anti-pollution bracket 6 is further limited, and through a large number of experimental tests, the distance between the fence 61 and the protection sheet 7 is 15 mm-25 mm, and when the distance between the fence 61 and the opening at the smaller end of the anti-pollution bracket 6 is 20 mm-30 mm, the smooth light path channel can be ensured, and meanwhile, the entering of external oil smoke can be avoided to the greatest extent. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

Example 10:

the embodiment provides a range hood, as shown in fig. 5, the lower right part of the turbine air inlet of the range hood is provided with the range hood sensor according to the above embodiment, and the included angle between the light beam emitted by the range hood sensor and the plane of the range hood is 5-45 degrees. The mounting position of the oil smoke sensor is a necessary passage area where most oil smoke enters the turbofan, most of the turbofan of the smoke machine rotates clockwise, and most of the oil smoke enters the fan from the left side direction of the air inlet of the turbine of the smoke machine under the drive of the centrifugal force of the turbine. Therefore, the sensor module is not arranged on the main air duct, and the pollution resistance is stronger. Meanwhile, the coincidence of the detection area of the oil smoke sensor and the main air duct is ensured, so that the detection is more sensitive and effective. When the oil smoke sensor is installed in the range hood, an included angle between a light beam emitted by the oil smoke sensor and a plane where the range hood is located is 5-45 degrees, and the reason is that oil accumulation and water on the module are conveniently reserved. Other portions of the present embodiment are the same as those of the above embodiment, and will not be described again.

It will be appreciated that the operation and operation of components such as the light emitting element 2, the light sensing element 3 and the turbine inlet according to one embodiment of the present utility model are well known to those skilled in the art and will not be described in detail herein.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a lampblack sensor, includes shell (1), be provided with light emitting element (2) of emission infrared light in shell (1), receive photosensitive element (3) of lampblack granule (15) reflection or refraction light, its characterized in that is equipped with optical collimating lens (4) and optical condensing lens (5) on shell (1), optical collimating lens (4) become the light beam with the infrared light of light emitting element (2) emission, optical condensing lens (5) focus the light of lampblack granule (15) reflection or refraction on photosensitive element (3), pollution prevention support (6) are still installed to shell (1) one side, the appearance of support (6) is the cone form, and its inside is provided with the light path passageway rather than appearance assorted, the great one end of light path passageway is detachable swing joint with shell (1), and less one end is the opening of emission light beam or receipt light.

2. A smoke sensor according to claim 1, characterized in that the housing (1) is further embedded with a protective sheet (7) for preventing the optical collimator lens (4) and the optical condensing lens (5) from being polluted, said protective sheet (7) being arranged between the anti-pollution bracket (6) and the optical collimator lens (4) and the optical condensing lens (5).

3. A smoke sensor according to claim 2, further comprising a gland (12) securing the optical collimator lens (4) and the optical condenser lens (5) to the housing (1), said gland (12) being interposed between the protective sheet (7) and the optical collimator lens (4) and the optical condenser lens (5).

4. A smoke sensor according to any one of claims 1-3, characterized in that the light emitting element (2) and the photosensitive element (3) are both mounted on the PCBA board (8) and are both located on the same side of the PCBA board (8), the distance between the light emitting element (2) and the photosensitive element (3) is 5-10 mm, the PCBA board (8) is fixedly mounted inside the housing (1), a light emitting driving circuit, a signal processing circuit, a microprocessor and a control cable (9) are arranged on the PCBA board (8), the microprocessor controls the light emitting element (2) to emit infrared light through the light emitting driving circuit, the microprocessor controls the photosensitive element (3) to convert the light signal into an electrical signal through the signal processing circuit, the microprocessor also obtains the smoke concentration through calculating the electrical signal, and outputs the control signal through the control cable (9), and the control cable (9) also provides power supply for the normal operation of the PCBA board (8).

5. A smoke sensor according to claim 3, characterized in that the bottom of the housing (1) is further provided with a bottom cover (10) detachably connected to the housing (1), and a shielding cover (11) is arranged between the bottom cover (10) and the PCBA board (8).

6. The oil smoke sensor according to claim 5, wherein the shell (1) and the anti-pollution bracket (6) are fixed through fastening screws (13), and the bottom cover (10), the shielding cover (11) and the PCBA board (8) are fixed with the shell (1) through long screws (14) penetrating through the bottom cover, the shielding cover and the PCBA board.

7. A smoke sensor according to claim 1 or 2, characterized in that the optical collimator lens (4) converts the infrared light emitted by the light emitting element (2) into a cylindrical parallel light beam with a diameter of 6-8mm.

8. The oil smoke sensor according to claim 2, wherein a fence (61) is arranged in the middle of a light path channel in the anti-pollution bracket (6), a through hole for ensuring the light path channel to be smooth is arranged in the middle of the fence (61), and the through hole is in a shape that two circles intersect.

9. The oil smoke sensor according to claim 8, wherein the distance between the fence (61) and the protection sheet (7) is 15 mm-25 mm, and the distance between the fence (61) and the opening at the smaller end of the anti-pollution bracket (6) is 20 mm-30 mm.

10. The range hood is characterized in that the range hood is provided with the range hood sensor according to any one of claims 1-9 at the right lower part of a turbine air inlet, and an included angle between a light beam emitted by the range hood sensor and a plane of the range hood is 5-45 degrees.