A test device for dust response performance of smoke detector

Abstract

The present invention relates to a test device for the dust response performance of a smoke detector, comprising a base, a hemispherical base groove is arranged on the top of the base, a top cover which is detachably connected to the top of the base and is arranged on the base groove, and a top cover groove which is the same as the base groove is arranged on the bottom surface of the top cover; a fan with an air outlet facing downward and centrally arranged is detachably installed in the base groove, an air outlet air distribution plate which is detachably installed in the base groove is arranged at the lower end of the air outlet, and a base air distribution plate which is detachably installed in the base groove is arranged at the upper end of the base groove; a mounting frame for installing a detector which is detachably installed in the top cover groove is arranged in the middle position of the groove bottom of the top cover groove, and a wire through hole for passing a wire is arranged in the middle position of the top of the top cover. The invention can simulate a uniform dust environment and can accurately test the dust response performance of different detectors.

Description

Technical Field

[0001] The invention relates to the technical field of fire detection, in particular to a test device for the dust response performance of a smoke detector. Background Art

[0002] Photoelectric smoke detectors on the market mainly use optical mazes to detect the concentration of smoke particles based on the principle of particle optical Mie scattering. When the concentration of smoke particles reaches the alarm threshold, the detector will alarm. Since photoelectric smoke detectors essentially detect light scattering signals from particles, non-smoke particles can also cause light scattering, such as dust, water vapor, etc., which is consistent with the principle of light scattering of smoke particles. Dust is everywhere in our daily environment, especially in places with strong winds and sand. The accumulation of dust in the detector maze often leads to false alarms. Therefore, it is necessary to test the dust resistance of the detector. However, there is currently no test device for the dust response performance of smoke detectors, and it is impossible to accurately test the dust response performance of smoke detectors. Summary of the invention

[0003] In view of the existing deficiencies, the present invention provides a test device for the dust response performance of a smoke detector.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a test device for the dust response performance of a smoke detector, comprising a base, a hemispherical base groove is arranged on the top of the base, a top cover arranged on the base groove can be detachably connected to the top of the base, a top cover groove which is the same as the base groove is arranged on the bottom surface of the top cover, and the diameters of the base groove and the top cover groove are not less than 520mm; a fan with an air outlet facing downward and arranged in the center can be detachably installed in the base groove, the fan is an axial flow fan with adjustable speed, and a removable fan installed in the base groove is arranged at the lower end of the air outlet. An air outlet equalizing plate, the upper end of the base groove is provided with a base equalizing plate which can be detachably installed in the base groove and is located above the fan; the air outlet equalizing plate is an air equalizing plate with circular air equalizing holes, the base air equalizing plate is provided with a circular through hole in its center, and a plurality of fan-shaped through holes are symmetrically arranged with the circular through hole as the center and are evenly spaced radially outward from the circular through hole on the circumference of the circular through hole; a mounting frame for installing a detector which can be detachably installed in the top cover groove is provided in the middle position of the groove bottom of the top cover groove, and a wire through hole for passing wires is provided in the middle position of the top of the top cover.

[0005] Preferably, a plurality of installation positions for installing detectors are symmetrically arranged on the installation frame along the radial direction of the installation frame.

[0006] Preferably, there are two installation positions.

[0007] Preferably, the base comprises a bracket and a bottom shell detachably mounted on the bracket, the base groove is arranged on the top of the bottom shell, and the bottom shell and the top cover are both hemispherical shells.

[0008] Preferably, the bottom shell and the top cover are both transparent shells.

[0009] Preferably, the top cover is also provided with a dust adding through hole for adding dust.

[0010] Preferably, the ash adding through hole is arranged at an edge position of the top cover adjacent to the bottom end thereof.

[0011] Preferably, the fan is an axial flow fan with adjustable speed.

[0012] The beneficial effects of the present invention are as follows: the cavity formed by the combination of two hemispherical grooves will not produce corner points, will not cause dust accumulation, and utilizes the blowing of a fan to simulate a uniform dust environment, so the dust response performance of the smoke detector can be tested very conveniently. The test results are accurate and reliable, and the performance differences of the smoke detectors can be distinguished. Smoke detectors of different sensitivities are selected for different environments, which is more conducive to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the decomposed structure of an embodiment of the present invention;

[0014] Figure 2 is a schematic structural diagram of an embodiment of the present invention;

[0015] Figure 3 is a schematic diagram of the structure of a top cover according to an embodiment of the present invention;

[0016] Figure 4 is a schematic diagram of the installation structure of the mounting bracket and the smoke detector according to an embodiment of the present invention;

[0017] The names and serial numbers of the parts in the figure are: 1-base 10-bracket 11-bottom shell 2-base groove 3-top cover 30-ash adding hole 4-top cover groove 5-fan 6-air outlet equalizing plate 7-base air equalizing plate 8-mounting frame 80-installation position 9-wire through hole. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described in conjunction with the accompanying drawings and embodiments below for a clear and complete description. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. In addition, the directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only referenced to the directions of the attached diagrams. The directional terms used are for better and clearer explanation and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have, and therefore cannot be understood as limitations on the present invention.

[0019] Embodiments of the present invention Figures 1 to 4As shown in, a test device for the dust response performance of a smoke detector includes a base 1, the top of the base 1 is provided with a hemispherical base groove 2, the outer wall of the base groove 2, that is, the outer surface of the base 1 can be of any shape, the hemispherical shape means that there are no protruding corners in the base groove 2, and all are smooth curved surfaces, which is convenient for the airflow to diffuse evenly around, the top of the base 1 is detachably connected with a top cover 3 arranged on the base groove 2, the top cover 3 is arranged on the base groove 2 to close the base groove 2 to form a closed cavity, at this time, the bottom surface of the top cover 3 is provided with a top cover groove 4 that is the same as the base groove 2, which means that the top cover groove 4 is also hemispherical and inverted, so that the top cover groove 4 is an inverted groove relative to the top cover 3. When the top cover 3 is placed on the base groove 2, the open end of the top cover groove 4 and the open end of the base groove 2 abut against each other to form a spherical cavity, which will not be affected by the external environment during the test, making the test result more accurate. The detachable top cover 3 and the base 1 facilitate their cleaning after the test, ensuring that the accurate test environment can be simulated after multiple tests, providing accurate test results, and thus distinguishing the performance difference of the sensitivity of the smoke detector. At this time, it is preferred that the diameter of the base groove 2 and the top cover groove 4 is not less than 520 mm, which ensures that the dust has enough space to move while maintaining the installation space of the smoke detector, and can also better simulate different environments;The fan 5 is a detachable fan installed in the base groove 2 with the air outlet facing downward and arranged in the center, that is, the air outlet is in the middle position and faces downward, and the wind coming out of the air outlet blows to the bottom of the base groove 2, and turns to blow upward after passing through the bottom of the base groove 2, thereby reducing the wind force, so that the dust can be evenly dispersed in the cavity formed by the base groove 2 and the top cover groove 4, thus avoiding the problem of uneven dust distribution in the cavity caused by excessive wind force caused by the wind coming out of the air outlet directly blowing upward. The fan 5 is an axial flow fan with adjustable speed, which can simulate the dust environment under different wind speed conditions, and the lower end of the air outlet is provided with an air outlet uniforming plate 6 detachably installed in the base groove 2. The air outlet uniforming plate 6 reduces the wind force, makes the wind speed more uniform, and at the same time disperses the wind force to different directions, so that the dust in the base groove 2 is more evenly stressed. It is an air uniforming plate with circular air uniforming holes, which can better The wind speed at the air outlet is adjusted to make the wind speed more uniform, and the dust raised by the wind is more uniform. The upper end of the base groove 2 is provided with a base air equalizing plate 7 which is detachably installed in the base groove 2 and is located above the fan 5. The base air equalizing plate is installed at the open end of the base groove to form a hemisphere with the base. Similarly, the base air equalizing plate 7 allows dust to enter the top cover groove 4 evenly. At the same time, in order to prevent dust from falling into the fan 5, a baffle is provided between the base air equalizing plate 7 and the fan 5 at a position corresponding to the air inlet of the fan 5. The base air equalizing plate 7 is provided with a circular through hole at its center, and a plurality of fan-shaped through holes are symmetrically arranged at equal intervals along the radial direction of the circular through hole with the circular through hole as the center. This can prevent dust from gathering on the base air equalizing plate 7 when entering the top cover groove 4, thereby ensuring the dust raising effect and forming a uniform dust environment in the top cover groove 4.The middle position of the groove bottom of the top cover groove 4 is provided with a mounting frame 8 for mounting the detector, which can be detachably mounted in the top cover groove 4. The mounting frame 8 is used to install the smoke detector, and can be installed in different ways, such as the engagement of the groove and the block, the clamping of the clip, etc. The position of the mounting frame 8 makes the smoke detector in the middle of the top cover groove 4, which can detect the dust condition of its surrounding environment more comprehensively and accurately, and can also better detect the quality of the smoke detector's smoke sensing performance. The top middle position of the top cover 3 is provided with a wire through hole 9 for passing the wire. During the test, the power line connecting the fan 5, the connecting line for information transmission between the smoke detector and the detection equipment, etc. can be connected through the wire through hole 9. At the same time, a connecting pipe can be installed at the wire through hole 9. The connecting pipe is connected to the mounting frame 8, which is convenient for connection and simplifies the structure. The detachability between the various components in the entire test device can be achieved through a snap-fit ​​structure or a threaded connection structure. The detachability is convenient for cleaning and also avoids the accumulation of dust from affecting the detection results. In this way, the cavity formed by the combination of the two hemispherical grooves has no protruding corners and is entirely smooth arc surfaces, which will not cause dust accumulation. The fan 5 can be used to simulate a uniform dust environment, and the dust response performance of the smoke detector can be tested very conveniently. The test results are accurate and reliable, and the performance differences of the smoke detectors can be distinguished. Smoke detectors with different sensitivities can be selected for different environments, which is more conducive to use. ;

[0020] Further improvements such as Figure 1 and Figure 4 As shown in the figure, the mounting frame 8 is provided with a plurality of mounting positions 80 for mounting detectors symmetrically along the radial direction of the mounting frame 8, so that multiple detectors can be tested at the same time, thereby improving the test efficiency. Preferably, two mounting positions 80 are provided to avoid affecting the flow of dust when too many are installed.

[0021] Further improvements such as Figure 1 and Figure 2 As shown in , the base 1 includes a bracket 10, a bottom shell 11 detachably mounted on the bracket 10, the base groove 2 is arranged on the top of the bottom shell 11, and the bottom shell 11 and the top cover 3 are both hemispherical shells, which is convenient for cleaning the base groove 2 and the top cover groove 4 before testing, ensuring more accurate test results. At this time, the bottom shell 11 and the top cover 3 are both transparent shells, such as made of acrylic material, so that the operation of the internal dust can be intuitively observed.

[0022] Further improvements such as Figures 1 to 3As shown in the figure, the top cover 3 is also provided with a dust adding hole 30 for adding dust. Through the dust adding hole 30, a brush can be used to lightly and continuously eject dust into the air inlet of the fan 5, and the dust is lifted up in the test device, thereby detecting the response of the smoke detector to dust. The dust adding hole 30 is arranged at the edge of the top cover 3 near its bottom. After the top cover 3 is covered on the base 1, the dust adding hole 30 is located above the base air balancing plate 7. When it is necessary to change the dust situation in the cavity formed by the top cover groove 4 and the base groove 2, a brush is used to lightly and continuously eject dust from the dust adding hole 30 to the air inlet of the fan 5, and the change of the detector's response curve to different dust is detected, thereby detecting the quality of the smoke detector's performance.

[0023] When in use, first clean the dust in the top cover groove 4, the base groove 2, the air outlet equalizing plate 6, the fan 5 and the base equalizing plate 7, place the fan 5 with the air outlet facing down and centered in the base groove 2, assemble the test device and let it stand for 10 minutes; connect the fan 5 power cord, the smoke detector's machine communication line, the data collection tool and other external devices through the wire through hole 9; and install the detector on the installation position 80 of the mounting frame 8; turn on the data collection tool and start receiving the dust response curve of the detector in the stable state; turn on the fan 5 and start receiving the dust response curve of the detector in the windy state; start to use a brush to lightly and continuously flick dust from the dust adding through hole 30 to the air inlet of the fan 5, and observe the changes in the dust response curve of the detector.

[0024] It should be understood that those skilled in the art may make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A test device for the dust response performance of a smoke detector, characterized in that : It includes a base, the top of the base is provided with a hemispherical base groove, the top of the base is detachably connected with a top cover arranged on the base groove, the bottom surface of the top cover is provided with a top cover groove which is the same as the base groove, and the diameters of the base groove and the top cover groove are not less than 520mm; a fan with an air outlet facing downward and arranged in the center is detachably installed in the base groove, and the fan is an axial flow fan with adjustable speed, the lower end of the air outlet is provided with an air outlet air balancing plate which is detachably installed in the base groove, and the upper end of the base groove is provided with A base air equalizing plate is detachably installed in the base groove and is located above the fan; the outlet air equalizing plate is an air equalizing plate with circular air equalizing holes, the base air equalizing plate is provided with a circular through hole in its center, and a plurality of fan-shaped through holes are symmetrically arranged around the circular through hole and are evenly spaced outward along the radial direction of the circular through hole; a mounting frame for mounting a detector that can be detachably installed in the top cover groove is provided in the middle position of the bottom of the groove of the top cover, and a wire through hole for passing wires is provided in the middle position of the top of the top cover.

2. The test device for the dust response performance of a smoke detector according to claim 1, characterized in that The mounting frame is provided with a plurality of mounting positions for mounting the detector symmetrically along the radial direction of the mounting frame.

3. The test device for the dust response performance of a smoke detector according to claim 2, characterized in that : There are two installation positions.

4. The test device for the dust response performance of a smoke detector according to claim 1, characterized in that The base comprises a bracket and a bottom shell which can be detachably mounted on the bracket. The base groove is arranged on the top of the bottom shell. The bottom shell and the top cover are both hemispherical shells.

5. The test device for the dust response performance of a smoke detector according to claim 4, characterized in that The bottom shell and the top cover are both transparent shells.

6. The test device for the dust response performance of a smoke detector according to claim 1, characterized in that The top cover is also provided with a dust adding hole for adding dust.

7. The test device for the dust response performance of a smoke detector according to claim 6, characterized in that The ash adding through hole is arranged at the edge of the top cover adjacent to its bottom end.

8. The test device for the dust response performance of a smoke detector according to claim 1, characterized in that The fan is an axial flow fan with adjustable speed.

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