A smoke detection device
By using fan-driven centrifugal motion in the detection smoke generator, the problem of high price and unstable performance of existing aerosol generators is solved, and the continuous adjustment and precise control of the smoke particle size is achieved, which is suitable for fire protection detection equipment.
Patent Information
- Application Number
- CN202211170467.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-09-23
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2042-09-23
AI Technical Summary
Existing aerosol generators are expensive and unstable in performance, making them difficult to be suitable for fire detection equipment, and the continuous adjustment and precise control of smoke particle size cannot be achieved.
The smoke generation device for detection including a smoke generation mechanism and a particle separation mechanism is adopted, and the smoke is driven to centrifugal movement in the separation cylinder by using a fan. The smoke particle size is screened through centrifugal force, and the traditional filter plate filtration is replaced to achieve continuous adjustment of the particle size.
It realizes continuous adjustment of smoke particle size, has a wide range of application, a small device size, does not require drying compressed air source, and the response error is less than 3%, meeting the test requirements.
Smart Images
Figure CN115586050B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to detection equipment in the fire-fighting electronics industry, and in particular to a smoke-generating device for detecting smoke detectors. Background Art
[0002] According to the requirements of GB4715-2005, the test smoke required for the standard smoke box should be smoke with a particle size of 0.5nm to 1nm. Generally, aerosols are polydisperse, so the smoke particles need to be screened so that the diameter of most particles in the smoke is within the above range to qualify as qualified test smoke.
[0003] Currently, standard smoke chambers use polydisperse aerosol generators to simulate the smoke produced by smoldering materials (such as cotton rope) for testing fire alarm products. These aerosol generators typically generate smoke by blowing smoke oil through a high-pressure, high-speed airflow. The smoke is then filtered and controlled by a special chamber baffle to produce a fixed number of different particle sizes, ensuring that particles between 0.5nm and 1nm account for at least 70% of the smoke.
[0004] Currently, common aerosol generators are mainly imported products from abroad and various domestic imitation products. Imported products and consumables are expensive, while the performance and quality of domestic imitation products are generally unstable. In addition, the above-mentioned aerosol generators are mainly used for leak detection in clean workshops and other places where leak detection is required. They require a dry high-pressure air source and are not suitable for embedding in fire detection equipment. The particle size range cannot be continuously fine-tuned, making it inconvenient to accurately control the smoke generation process through the smoke box system program. Summary of the Invention
[0005] In view of this, in order to overcome the defects of the prior art, an object of the present invention is to provide an improved smoke generating device for detection, which can effectively achieve continuous adjustment of smoke particle size.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions:
[0007] A smoke-generating device for detection comprises a smoke generating mechanism and a particle separation mechanism, the particle separation mechanism comprises a cylinder and a separation cylinder and a fan arranged in the inner cavity of the cylinder, a separation chamber is opened in the separation cylinder, the fan is arranged in the separation chamber, an air outlet is provided on the top of the separation cylinder, the air outlet connects the separation chamber and the inner cavity of the cylinder, an air inlet joint and an air outlet joint are provided on the cylinder, the air inlet joint connects the separation chamber, and the air outlet joint connects the inner cavity of the cylinder; the smoke emitted by the smoke generating mechanism enters the separation chamber through a pipe and an air inlet joint.
[0008] According to some preferred embodiments of the present invention, the fan includes a base plate, a rotating plate, blades, and a motor for driving the rotating plate to rotate. The blades are evenly spaced along the edge of the rotating plate. The motor is located at the center of the rotating plate. The rotating plate and the base plate are connected to each other via a bearing or other rotational connection, and the motor drives the rotating plate to rotate on the base plate.
[0009] According to some preferred embodiments of the present invention, the length extension direction of the fan blade is perpendicular to the plane where the rotating plate is located, that is, the fan blade extends along the height direction of the separation barrel.
[0010] According to some preferred embodiments of the present invention, the fan blades are curved, with the curved openings oriented in the same direction as the rotation of the rotating plate. That is, the concave portion of the fan blades is at the front, and the protruding portion is at the rear. The curved blades and their orientation provide greater airflow, enabling better airflow disturbance (eddy currents) and smoke particle size screening.
[0011] According to some preferred embodiments of the present invention, a channel for smoke circulation is formed between adjacent fan blades, and the width of the channel outlet is greater than the width of the channel inlet, that is, the width of the channel gradually increases from close to the motor to away from the motor.
[0012] According to some preferred embodiments of the present invention, baffles are provided on the inner wall of the separation drum, with each baffle having a length aligned with the height of the drum. The baffles serve to absorb and deflect larger particles. Furthermore, the width of the baffles on the side closest to the fan can be reduced, or even narrowed to form a single edge, to separate larger smoke particles into smaller ones.
[0013] According to some preferred embodiments of the present invention, the width direction of the baffle is the same as the radial direction of the rotating plate, that is, the width direction of the baffle extends along the radial direction of the rotating plate.
[0014] According to some preferred embodiments of the present invention, the width of the baffle is oriented toward the rotation direction of the rotating plate. The inclination direction of the baffle away from the inner wall of the separation cylinder is the same as the rotation direction of the rotating plate to avoid excessive resistance of the baffle.
[0015] According to some preferred embodiments of the present invention, a mounting post is provided on the inner wall of the separation cylinder, a mounting ear is provided on the bottom plate, and the mounting post is fixedly connected to the mounting ear.
[0016] According to some preferred implementation aspects of the present invention, the device comprises a base, and the smoke generating mechanism and the particle separation mechanism are arranged on the base.
[0017] Due to the adoption of the above technical solution, compared with the existing technology, the benefits of the present invention are: the detection smoke-generating device of the present invention, by arranging a separation cylinder and a fan in the cylinder body, drives the smoke to perform centrifugal motion in the separation cylinder through the rotation of the fan, and filters the smoke of a set particle size through the principle of centrifugal motion, which can replace the traditional use of a filter plate for filtering and screening, and at the same time can achieve continuous adjustment of the particle size of the escaping smoke, which is convenient and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0019] Figure 1 Schematic diagram of the three-dimensional structure of the smoke generating device for detection in a preferred embodiment of the present invention;
[0020] Figure 2 A schematic diagram of the three-dimensional structure of a particle separation mechanism in a preferred embodiment of the present invention;
[0021] Figure 3 A schematic cross-sectional view of a particle separation mechanism in a preferred embodiment of the present invention;
[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the separation drum and the fan in the preferred embodiment of the present invention;
[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the separation cylinder in the preferred embodiment of the present invention;
[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of a fan in a preferred embodiment of the present invention;
[0025] Figure 7 This is a side structural diagram of a separation drum and a fan in a preferred embodiment of the present invention;
[0026] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along the AA direction;
[0027] Figure 9 This is a schematic diagram of the three-dimensional structure of a separation cylinder in another preferred embodiment of the present invention;
[0028] Figure 10 This is a schematic cross-sectional view of a separation drum and a fan in another preferred embodiment of the present invention;
[0029] In the accompanying drawings, base 1, smoke generating mechanism 2, particle separation mechanism 3, cylinder 4, cylinder inner cavity 41, air inlet connector 42, air outlet connector 43, separation cylinder 5, separation cavity 51, air inlet 52, air outlet 53, mounting column 54, baffle 55, fan 6, bottom plate 61, rotating plate 62, motor 63, fan blades 64, channel 65, mounting ear 66. DETAILED DESCRIPTION
[0030] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.
[0031] like Figure 1-8 As shown, the smoke detection device in this application includes a base 1, a smoke generating mechanism 2 disposed on the base 1, and a particle separation mechanism 3. The base 1 contains oil, and the smoke generating mechanism 2 is used to heat the oil to generate smoke containing particles. This can be achieved using mechanisms and principles known in the art and will not be further described here. A pipeline (not shown) is provided between the smoke generating mechanism 2 and the particle separation mechanism 3 to transport the smoke to the particle separation mechanism 3 for particle screening.
[0032] The particle separation mechanism 3 includes a barrel 4, a separation barrel 5, and a fan 6 disposed within the barrel's inner cavity 41. The separation barrel 5 defines a separation chamber 51, and the fan 6 is disposed within the separation chamber 51. An air outlet 53 is disposed at the top of the separation barrel 5, connecting the separation chamber 51 with the barrel's inner cavity 41. The barrel 4 is provided with an air inlet connector 42 and an air outlet connector 43, connecting the air inlet connector 42 to the separation chamber 51, and the air outlet connector 43 to the barrel's inner cavity 41. The separation barrel 5 has an air inlet 52 corresponding to the air inlet connector 42. Smoke emitted by the smoke generating mechanism 2 enters the separation chamber 51 through a pipe, the air inlet connector 42, and the air inlet 52.
[0033] The fan 6 comprises a base plate 61, a rotating plate 62, blades 64, and a motor 63 for rotating the rotating plate 62. Multiple blades 64 are evenly spaced around the edge of the rotating plate 62. The motor 63 is located at the center of the rotating plate 62. The rotating plate 62 is rotatably connected to the base plate 61 using a bearing or other similar mechanism. The motor 63 drives the rotating plate 62 to rotate on the base plate 61. Mounting posts 54 are provided on the inner wall of the separation drum 5, and mounting ears 66 are provided on the base plate 61. The mounting posts 54 are fixedly connected to the mounting ears 66.
[0034] The length extension direction of the blade 64 is perpendicular to the plane where the rotating plate 62 is located, that is, the blade 64 extends along the height direction of the separation cylinder 5. The blade 64 is arranged in an arc shape, and the arc opening of the blade 64 faces the same direction as the rotation direction of the rotating plate 62. That is, when viewed from the rotation direction, Figure 6 and 8 As shown, the concave portion of the fan blade 64 is in the front and the protruding portion is in the rear. The arc-shaped fan blade 64 and the direction setting of the fan blade 64 have a larger air volume, which can better disturb the airflow (vortex) and screen the smoke particle size. A channel 65 for smoke circulation is formed between adjacent fan blades 64, and the width of the outlet of the channel 65 is greater than the width of the inlet. That is, the width of the channel 65 gradually increases from close to the motor 63 to the direction away from the motor 63. At the same time, the fan blades in this embodiment have different diameters of the circles corresponding to the two side surfaces. The diameter of the circle corresponding to the front arc surface close to the rotation direction is greater than the diameter of the circle corresponding to the rear arc surface, which is more conducive to the flow of airflow and the screening of particle size.
[0035] Baffles 55 are provided on the inner wall of the separation cylinder 5, and the length direction of each baffle 55 is the same as the height direction of the separation cylinder 5. On the one hand, the baffle 55 is used to adsorb and block particles of larger mass. On the other hand, the width of the baffle 55 on the side close to the fan 6 can be set to be smaller, or even thinned into a side edge, to separate smoke particles of larger mass into particles of smaller mass. The width direction of the baffle 55 is toward the rotation direction of the rotating plate 62. The inclination direction of the baffle 55 on the side away from the inner wall of the separation cylinder 5 is the same as the rotation direction of the rotating plate 62, so as to avoid excessive resistance of the baffle 55. Specifically, as Figure 4-8 As shown, the cross section of the baffle 55 in this embodiment is a (quasi) triangle, which has a first slope and a second slope. The first slope and the second slope are connected to each other on the side close to the fan 6 to form a tip, which can be used to separate particles with larger mass; the other side is connected to the inner wall of the separation cylinder 5 away from each other, that is, the distance between the first slope and the second slope gradually increases from the side close to the fan 6 to the side away from the fan 6. At the same time, the tip formed by the first slope and the second slope faces the direction of rotation of the fan 6, from Figure 8 In the middle, it is in the clockwise direction to avoid being perpendicular to the airflow direction and causing too much resistance.
[0036] like Figure 9-10 As shown, in other embodiments, the width direction of the baffle 55 is the same as the radial direction of the rotating plate 62 , that is, the width direction of the baffle 55 extends along the radial direction of the rotating plate 62 .
[0037] The main working principle of the detection smoke generating device in this embodiment is as follows: The aerosol detection smoke generating device of the present invention includes two parts, the first part is the smoke generating mechanism 2 (existing technology, no longer repeated), and the second part is the smoke particle screening (separation) mechanism, which is composed of a separation cylinder 5 and a vortex fan 6. After the smoke generated by the smoke generating mechanism 2 enters the separation chamber 51, it rotates at high speed under the drive of the vortex fan 6. Due to the action of centrifugal force, the larger mass smoke particles move away from the center and are blocked by the baffle 55 on the inner side of the separation chamber 51. At the same time, some of the larger mass particles are torn by the airflow at the cut at the leading edge of the blade and decomposed into smaller mass particles. The smaller mass particles no longer continue to decompose, and under the action of the airflow, escape from the air outlet 53 at the upper part of the separation chamber 51 to output test smoke.
[0038] The vortex fan 6 can precisely control its rotational speed, adjusting it to rotate the smoke under varying centrifugal forces, thereby trapping large particles. This allows for the output of test smoke with varying particle size ratios, achieving continuous fine-tuning. The smoke detector of the present invention can control smoke particles within a range of 0.5nm to 1nm. Compared to smoke generated by a standard smoldering cotton rope, the response error of the smoke detector was less than 3%, fully meeting testing requirements. The device is compact and does not require a dry compressed air source.
[0039] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.
Claims
1. A smoke detection device, characterized in that: It includes a smoke generating mechanism and a particle separation mechanism, the particle separation mechanism includes a cylinder and a separation cylinder and a fan arranged in the inner cavity of the cylinder, a separation chamber is opened in the separation cylinder, the fan is arranged in the separation chamber, an air outlet is provided on the top of the separation cylinder, the air outlet connects the separation chamber and the inner cavity of the cylinder, an air inlet joint and an air outlet joint are provided on the cylinder, the air inlet joint connects the separation chamber, and the air outlet joint connects the inner cavity of the cylinder; the smoke emitted by the smoke generating mechanism enters the separation chamber through a pipe and an air inlet joint. The fan includes a base plate, a rotating plate, blades, and a motor for driving the rotating plate to rotate, wherein a plurality of blades are evenly spaced and distributed on the edge of the rotating plate; the length extension direction of the blades is perpendicular to the plane on which the rotating plate is located; the blades are arranged in an arc shape, and the arc openings of the blades face the same direction of rotation of the rotating plate; channels for smoke circulation are formed between adjacent blades, and the width of the channel outlet is greater than the width of the channel inlet; the diameters of the circles corresponding to the two side surfaces of the blades are different, and the diameter of the circle corresponding to the front arc surface closer to the rotation direction is greater than the diameter of the circle corresponding to the rear arc surface; A baffle is provided on the inner wall of the separation cylinder, and the length direction of each baffle is the same as the height direction of the separation cylinder; the cross-section of the baffle is triangular, and it has a first inclined surface and a second inclined surface, and the first inclined surface and the second inclined surface are connected to each other on the side close to the fan to form a tip, and the tip can be used to separate particles with larger mass; the other side is connected to the inner wall of the separation cylinder away from each other, that is, the distance between the first inclined surface and the second inclined surface gradually increases from the side close to the fan to the side away from the fan; the tip formed by the first inclined surface and the second inclined surface is facing the rotation direction of the fan.
2. The smoke detection device according to claim 1, characterized in that: The width direction of the baffle is the same as the radial direction of the rotating plate.
3. The smoke detection device according to claim 1, characterized in that: The width direction of the baffle is toward the rotation direction of the rotation plate.
4. The smoke detection device according to claim 1, characterized in that: A mounting post is provided on the inner wall of the separation cylinder, a mounting ear is provided on the bottom plate, and the mounting post is fixedly connected to the mounting ear.
5. The detection smoke generating device according to any one of claims 1 to 4, characterized in that: It comprises a base, and the smoke generating mechanism and the particle separating mechanism are arranged on the base.
Citation Information
Patent Citations
Natural gas purification device
CN209555169U
Monodisperse aerosol generator and aerosol preparation system
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