CN220627185U - Reflecting device for eliminating dead zone of flame detector - Google Patents
Reflecting device for eliminating dead zone of flame detector Download PDFInfo
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- CN220627185U CN220627185U CN202322019264.9U CN202322019264U CN220627185U CN 220627185 U CN220627185 U CN 220627185U CN 202322019264 U CN202322019264 U CN 202322019264U CN 220627185 U CN220627185 U CN 220627185U
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- 238000001514 detection method Methods 0.000 claims abstract description 74
- 238000009434 installation Methods 0.000 claims description 24
- 230000004888 barrier function Effects 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 230000003287 optical effect Effects 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 241000982154 Kosteletzkya Species 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The utility model discloses a reflecting device for eliminating a dead zone of a flame detector, which relates to the technical field of flame detectors, and comprises the following components: an arc-shaped reflecting member and a cylindrical case; the arc-shaped reflecting piece is arranged on the outer surface of the columnar shell through the fixing piece; reflection means for: when no obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the device is arranged in the detection range of the flame detector, and the distance between the device and the boundary of the field of view is larger than the virtual focal length of the arc-shaped reflecting piece; when an obstacle exists in the detection range of the flame detector and no ignition point exists outside the detection range, the flame detector is arranged in one side area of the obstacle; when an obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the flame detector is installed in a side area of the obstacle and in the detection range of the flame detector. The device effectively monitors the ignition points outside the detection area and the ignition points behind the obstacles in the detection area, and reduces the monitoring blind area of the flame detector.
Description
Technical Field
The utility model relates to the technical field of flame detectors, in particular to a reflecting device for eliminating blind areas of flame detectors.
Background
Most of the existing flame detectors in the market trigger the discharge of a photoelectric tube by detecting and sensing infrared rays and ultraviolet rays with specific wavelengths generated when flame burns, so as to generate a flame alarm signal. However, most detectors can only detect flames in a specific area, and flames beyond the angle of the detectable field of view of the detector cannot be detected, and meanwhile, when an obstacle exists between the detector and the flames in the detection area, the flames cannot be detected. Therefore, the existing flame detector has a certain potential safety hazard, and when facing a complex fire environment, the flame detector cannot fully play the role.
Disclosure of Invention
The utility model aims to provide a reflecting device for eliminating a blind area of a flame detector, which can expand the detection area of the flame detector, effectively monitor the ignition points outside the detection area and the ignition points behind obstacles in the detection area, and reduce the monitoring blind area of the flame detector.
In order to achieve the above object, the present utility model provides the following solutions:
a reflection apparatus for eliminating a dead zone of a flame detector, comprising: an arc-shaped reflecting member and a cylindrical case;
the arc-shaped reflecting piece is arranged on the outer surface of the columnar shell through a fixing piece;
the reflecting device is used for:
when no obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the device is arranged in the detection range of the flame detector, and the distance between the device and the boundary of the field of view is larger than the virtual focal length of the arc-shaped reflecting piece; the field boundary is an arc line formed by taking the flame detector as an origin and taking the distance between the flame detector and the farthest ignition point as a radius; the furthest ignition point is the furthest ignition position which can be detected by the flame detector under different angles;
when an obstacle exists in the detection range of the flame detector and no ignition point exists outside the detection range, the flame detector is arranged in one side area of the obstacle; wherein the flame detector is located in the other side region of the obstacle;
when an obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the flame detector is arranged in one side area of the obstacle and in the detection range of the flame detector, and the distance between the flame detector and the boundary of the field of view is larger than the virtual focal length of the arc-shaped reflecting piece.
Optionally, the angular bisector of the reflecting means is coincident with the normal of the arcuate reflecting member; wherein, the angular bisector of the reflecting device is the angular bisector of an included angle formed by the first straight line and the second straight line; the first straight line is a connecting line of the installation position of the reflecting device and the installation position of the flame detector; the second straight line is a connecting line of the installation position of the reflecting device and the ignition point position.
Optionally, the arc-shaped reflecting member forms a convex structure outside the cylindrical shell using the fixing member.
Optionally, the convex structure faces the direction of a detection blind area of the flame detector.
Optionally, when no obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the number of the reflecting devices is the number of the fire points; when the detection range of the flame detector is provided with barriers and no ignition point exists outside the detection range, the number of the reflecting devices is the number of the barriers; when the obstacle exists in the detection range of the flame detector and the ignition point exists outside the detection range, the number of the reflecting devices is the number of the obstacle and the number of the ignition point.
Optionally, the fixing piece is a bolt or a colloid.
Optionally, the arc-shaped reflecting member is a polished metal aluminum sheet.
Optionally, the columnar shell is a hollow plastic triangular prism or a polygonal prism.
According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:
the utility model provides a reflecting device for eliminating a dead zone of a flame detector, which utilizes a columnar shell to fix an arc-shaped reflecting piece, so that the arc-shaped reflecting piece forms a structure similar to a convex lens, and flame light at a fire point is projected onto the flame detector through the arc-shaped reflecting piece by utilizing the imaging principle of the convex lens, thereby triggering the flame detector to send an alarm signal. By utilizing the reflecting device, the detection area of the flame detector can be expanded, the ignition points outside the detection area and behind the obstacle can be effectively monitored, and the monitoring blind area of the flame detector is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of a reflection device for eliminating a blind zone of a flame detector according to the present utility model;
FIG. 2 is a top view of a reflection device for eliminating a blind zone of a flame detector according to the present utility model;
FIG. 3 is a graph of spectral reflectance at different wavelengths for a common metal;
FIG. 4 is a first mounting location diagram of a reflector device for eliminating flame detector dead zones;
FIG. 5 is a second mounting position diagram of a reflector device for eliminating flame detector dead zones;
FIG. 6 is a graph of angular sensitivity curves of a conventional flame detector.
Symbol description:
arc-shaped reflecting piece-1, columnar shell-2, flame detector-3, view field boundary-4, first ignition point-41, second ignition point-42, third ignition point-43, fifth ignition point-44, sixth ignition point-45, obstacle-5, fourth ignition point-51, seventh ignition point-52, eighth ignition point-53, and protection area boundary-6.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model aims to provide a reflecting device for eliminating a blind area of a flame detector, which can expand a detection area of the flame detector and effectively monitor ignition points outside the detection area and behind obstacles in the detection area.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
Example 1
The present embodiment provides a reflection apparatus for eliminating a blind zone of a flame detector, as shown in fig. 1 and 2, the reflection apparatus includes: an arc-shaped reflecting member 1 and a cylindrical case 2.
Specifically, the arc-shaped reflecting member 1 is mounted on the outer surface of the cylindrical shell 2 through a fixing member. As can be seen from fig. 3, since aluminum metal has high reflectivity in the ultraviolet to infrared wavelength bands, a polished aluminum metal sheet is used as the arc-shaped reflecting member 1. Meanwhile, in order to facilitate fixing the arc-shaped reflecting piece 1 and installing a reflecting device for eliminating the dead zone of the flame detector, the columnar shell 2 is a hollow plastic triangular prism or a polygonal prism, and each surface of the prism is a plane, so that a supporting plane can be provided for the arc-shaped reflecting piece 1. The arc-shaped reflecting piece 1 also needs to form a convex structure outside the columnar shell 2 by using a fixing piece, when the arc-shaped reflecting piece 1 is installed, firstly, the area of the arc-shaped reflecting piece 1 is ensured to be slightly larger than the area of the installation edge surface of the prism, and the aim is to form a slight bulge on the installation edge surface of the prism by using the redundant area of the arc-shaped reflecting piece 1. Secondly, bolts or colloid are selected as fixing pieces, and two ends of the arc-shaped reflecting piece 1 are respectively fixed on two side edges of the installation edge surface, so that a convex structure is supported.
Because the fire points which are not monitored by the flame detector can exist at the rear of the obstacle outside the detection range or in the detection range of the flame detector, and the fire points are all positioned in the detection blind areas of the flame detector, and the great potential safety hazards exist, therefore, the reflecting device for eliminating the blind areas of the flame detector is used for:
when no obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the flame detector is arranged in the detection range of the flame detector, and the distance between the flame detector and the boundary of the field of view is larger than the virtual focal length of the arc-shaped reflecting piece 1. The boundary of the view field is an arc line formed by taking the flame detector as an origin and taking the distance between the flame detector and the farthest ignition point as a radius; the furthest firing point is the furthest firing position that the flame detector can detect at different angles.
When an obstacle exists in the detection range of the flame detector and no ignition point exists outside the detection range, the flame detector is installed in a side area of the obstacle. Wherein the flame detector is located in the other side region of the obstacle.
When an obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the flame detector is installed in one side area of the obstacle and in the detection range of the flame detector, and the distance from the field of view boundary is larger than the virtual focal length of the arc-shaped reflecting piece 1.
Furthermore, the reflecting device for eliminating the blind area of the flame detector is used for being installed in different scenes and also meets certain optical conditions with the installation position of the flame detector. In particular, the angular bisector of the reflecting means should be coincident with the normal to the curved reflecting member 1. Wherein, the angular bisector of the reflecting device is the angular bisector of an included angle formed by the first straight line and the second straight line; the first straight line is a connecting line of the installation position of the reflecting device and the installation position of the flame detector; the second straight line is the connection line between the installation position of the reflecting device and the ignition point position. The installation position of the reflecting device can ensure that the flame detector monitors the ignition point in the detection blind area and triggers an alarm signal only when the optical condition is met.
Further, the reflecting means for eliminating the dead zone of the flame detector is required to satisfy the above-mentioned installation position and the above-mentioned optical condition, and the number of installation of the reflecting means is also related to the installation position thereof. Specifically, when no obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the number of the reflecting devices is the number of the fire points; when the detection range of the flame detector is provided with barriers and no ignition point exists outside the detection range, the number of the reflecting devices is the number of the barriers; when there are obstacles in the detection range of the flame detector and there are fires outside the detection range, the number of the reflecting devices is the number of the obstacles and the number of the fires.
Example two
The embodiment provides an actual application scene of a reflecting device for eliminating a blind area of a flame detector, which comprises the following specific processes:
taking the Japanese Kosteletzkya R2868 ultraviolet flame detector as an example, which is sensitive to ultraviolet rays with 185-260nm of ultraviolet wave band special for flame, in order to be better suitable for the Kosteletzkya R2868 ultraviolet flame detector, the convex radius R of the convex structure formed by the arc-shaped reflecting piece 1 needs to be 208mm, and the columnar shell 2 needs to be a hollow plastic scalene triangular column.
As shown in fig. 4, the flame detector 3 is first required to be placed within a protective area boundary 6, and the protective area boundary 6 is an area for ensuring the safety of the flame detector 3. The first ignition point 41, the second ignition point 42 and the third ignition point 43 are shared outside the view field boundary 4 of the flame detector 3, the fourth ignition point 51 is arranged behind the obstacle 5 in the view field boundary 4 of the flame detector 3, three reflection devices for eliminating the blind area of the flame detector are required to be arranged in the view field boundary 4 in order to enable the flame detector 3 to detect the four ignition points, one reflection device for eliminating the blind area of the flame detector is arranged behind the obstacle 5, and the four reflection devices for eliminating the blind area of the flame detector are ensured to be far away from the view field boundary 4 as far as possible, and the distance between the reflection devices and the view field boundary 4 is larger than r/2. Meanwhile, it is also necessary to ensure that the convex surface of the arc-shaped reflecting member 1 of the reflecting device faces the direction of the detection blind area of the flame detector 3, so that the angle bisector of the included angle formed by the connection line of the reflecting device and the flame detector 3 and the connection line of the reflecting device and the ignition point is consistent with the normal line of the convex surface of the arc-shaped reflecting member 1. After the installation position of the reflecting device for eliminating the dead zone of the flame detector is determined, the columnar shell 2 of the reflecting device is fixed at a proper position by using bolts or 3M glue. According to the formula for convex specular imaging: 1/f=1/u+1/v (where f is a focal length, u is an object distance, and v is an image distance), and the above-mentioned installation positions indicate that the light rays of the ignition point outside the field boundary 4 reflected by the reflecting device will be virtual images between the convex surface and the virtual focal length of the arc-shaped reflecting member 1, and the virtual images are located in the effective field boundary 4 of the flame detector 3, and the optical characteristics of the virtual images of the ignition point are equivalent to the optical characteristics of the actual ignition point in the effective field boundary 4, and the infrared rays and ultraviolet rays in the flame of the ignition point enter the probe of the flame detector 3 after passing through the reflecting device, trigger the flame detector 3 to alarm, and finally realize effective protection of the monitoring blind area of the flame detector 3.
Similarly, as shown in fig. 5, the fifth ignition point 44 and the sixth ignition point 45 are shared outside the view field boundary 4 of the flame detector 3, the seventh ignition point 52 and the eighth ignition point 53 are located behind the obstacle 5 in the view field boundary 4 of the flame detector 3, two reflection devices for eliminating the blind area of the flame detector are installed in the view field boundary 4 in order to enable the flame detector 3 to detect the four ignition points, two reflection devices for eliminating the blind area of the flame detector are installed behind the obstacle 5, and the four reflection devices for eliminating the blind area of the flame detector are kept far away from the view field boundary 4 as far as possible, and the distance between the reflection devices and the view field boundary 4 is larger than r/2. Meanwhile, it is also necessary to ensure that the convex surface of the arc-shaped reflecting member 1 of the reflecting device faces the direction of the detection blind area of the flame detector 3, so that the angle bisector of the included angle formed by the connection line of the reflecting device and the flame detector 3 and the connection line of the reflecting device and the ignition point is consistent with the normal line of the convex surface of the arc-shaped reflecting member 1. After the installation position of the reflecting device for eliminating the dead zone of the flame detector is determined, the columnar shell 2 of the reflecting device is fixed at a proper position by using bolts or 3M glue. After the installation of the reflecting device for eliminating the blind area of the flame detector is completed, infrared rays and ultraviolet rays in the flame at the ignition point enter the probe of the flame detector 3 after passing through the reflecting device, the flame detector 3 is triggered to alarm, and finally the effective protection of the monitoring blind area of the flame detector 3 is completed.
In addition, the field boundary of the flame detector is influenced by two factors, namely the volume of the flame source and the relative position (detection angle) of the flame source and the flame detector under the same flame source. When the fire source volume is fixed, the field boundary profile of the flame detector is consistent with the angular sensitivity curve as shown in fig. 6. According to practical measurement, when the volume of the butane gas fire source is 0.6cm3, the average value of the maximum detection distance (the maximum boundary of a specific angle) in the field boundary of the flame detector is 5 meters; when the butane gas fire source volume is 1.4cm3, the average value of the maximum detection distance (specific angle maximum boundary) in the field boundary of the flame detector is 12 meters. In general, the spatial shape of the area surrounded by the field boundary of the flame detector is unchanged, and the size of the area of the field boundary is proportional to the volume of the detected fire source and inversely proportional to the square of the distance from the fire source to the flame detector. Theoretically, as long as the fire source is large enough, the field boundary of the flame detector can be infinite, and different points on the boundary curved surface represent the maximum detection distances of different angles under the same fire source. On the other hand, the installation position of the reflecting device for eliminating the blind area of the flame detector in the boundary of the view field can also refer to the angle sensitivity curve of the flame detector, the reflecting device is prevented from being arranged in an angle area with large sensitivity attenuation as far as possible, the sensitivity of the reflecting device is optimal and the detecting effect is optimal when the reflecting device is arranged in a conical surface with an included angle of 120 DEG in the vertical central line of the detecting surface of the flame detector.
The reflecting device for eliminating the blind area of the flame detector can effectively expand the detection area of the flame detector, and the fire condition outside the boundary of the visual field of the flame detector can be monitored. Meanwhile, the reflection device can eliminate monitoring blind spots of the barrier blocking area in the view field boundary of the flame detector, and is beneficial to fire monitoring in complex environments. In addition, when the reflecting device is used for monitoring under the same complex environmental condition, the number of flame detectors can be greatly reduced, so that the equipment cost is greatly saved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present utility model and the core ideas thereof; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.
Claims (5)
1. A reflection assembly for eliminating a dead zone of a flame detector, said reflection assembly comprising: an arc-shaped reflecting member and a cylindrical case;
the arc-shaped reflecting piece is arranged on the outer surface of the columnar shell through a fixing piece;
two ends of the arc-shaped reflecting piece are respectively fixed on two side edges of the installation edge surface, so that a convex structure is supported; the convex structure faces the direction of a detection blind area of the flame detector; the columnar shell is a hollow plastic triangular prism or a polygonal prism; the area of the arc-shaped reflecting piece is slightly larger than the area of the installation edge surface of the prism;
the reflecting device is used for:
when no obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the device is arranged in the detection range of the flame detector, and the distance between the device and the boundary of the field of view is larger than the virtual focal length of the arc-shaped reflecting piece; the field boundary is an arc line formed by taking the flame detector as an origin and taking the distance between the flame detector and the farthest ignition point as a radius; the furthest ignition point is the furthest ignition position which can be detected by the flame detector under different angles;
when an obstacle exists in the detection range of the flame detector and no ignition point exists outside the detection range, the flame detector is arranged in one side area of the obstacle; wherein the flame detector is located in the other side region of the obstacle;
when an obstacle exists in the detection range of the flame detector and a fire point exists outside the detection range, the flame detector is arranged in one side area of the obstacle and in the detection range of the flame detector, and the distance between the flame detector and the boundary of the field of view is larger than the virtual focal length of the arc-shaped reflecting piece.
2. A reflecting device for eliminating a dead zone of a flame detector as defined in claim 1, wherein,
the angular bisector of the reflecting device is consistent with the normal line of the arc-shaped reflecting piece; wherein, the angular bisector of the reflecting device is the angular bisector of an included angle formed by the first straight line and the second straight line; the first straight line is a connecting line of the installation position of the reflecting device and the installation position of the flame detector; the second straight line is a connecting line of the installation position of the reflecting device and the ignition point position.
3. The reflection device for eliminating a dead zone of a flame detector according to claim 1, wherein when no obstacle exists in a detection range of the flame detector and a fire point exists outside the detection range, the number of the reflection devices is the number of the fire points; when the detection range of the flame detector is provided with barriers and no ignition point exists outside the detection range, the number of the reflecting devices is the number of the barriers; when the obstacle exists in the detection range of the flame detector and the ignition point exists outside the detection range, the number of the reflecting devices is the number of the obstacle and the number of the ignition point.
4. The reflection assembly for eliminating a dead zone of a flame detector of claim 1 wherein the fixing member is a bolt or a glue.
5. The apparatus of claim 1, wherein the arcuate reflector is a polished aluminum sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322019264.9U CN220627185U (en) | 2023-07-28 | 2023-07-28 | Reflecting device for eliminating dead zone of flame detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322019264.9U CN220627185U (en) | 2023-07-28 | 2023-07-28 | Reflecting device for eliminating dead zone of flame detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220627185U true CN220627185U (en) | 2024-03-19 |
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ID=90213964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322019264.9U Active CN220627185U (en) | 2023-07-28 | 2023-07-28 | Reflecting device for eliminating dead zone of flame detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220627185U (en) |
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2023
- 2023-07-28 CN CN202322019264.9U patent/CN220627185U/en active Active
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Effective date of registration: 20240517 Granted publication date: 20240319 |