Smoke detector sampling tube airflow cleaning device

Abstract

This utility model relates to an airflow cleaning device for a smoke detector sampling tube. The device is installed between the smoke detector body and the sampling tube, and includes a T-shaped three-way ball valve and a high-speed fan. The horizontal ends of the three-way ball valve are connected to the sampling tube and the smoke detector body, respectively, while the vertical end is connected to the high-speed fan. This smoke detector sampling tube airflow cleaning device utilizes the combination of a high-speed fan and a three-way ball valve to guide high-speed airflow to the sampling tube, thereby cleaning the air holes of the sampling tube, resolving air hole blockage, and improving airflow.

Description

Technical Field

[0001] This utility model relates to the field of airflow cleaning equipment technology, and in particular to an airflow cleaning device for a smoke detector sampling tube. Background Technology

[0002] An aspirating smoke detector is a device that continuously collects air samples, analyzes the samples to determine the smoke concentration, and then triggers an alarm based on a set alarm threshold. This type of smoke detector can continuously and actively collect air samples for detection, and has a better early warning effect. See patent document: CN116482298A - Monitoring of aspirating detection system.

[0003] The sampling tube of an aspirating smoke detector has a sampling port for sampling air within the detection area. It is sealed at the end with a cap. During operation, the detector's suction pump draws in air through the sampling tube, which is then filtered and sent to the detection chamber for smoke analysis. However, the suction velocity through the sampling port on the sampling tube is limited. After prolonged sampling, fine fibers and dust accumulate at the sampling port, reducing the suction efficiency and airflow of the tube, thus affecting the smoke detector's detection accuracy. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems and provide a smoke detector sampling tube airflow cleaning device.

[0005] The technical solution of this utility model is: an airflow cleaning device for a smoke detector sampling tube, installed on the sampling tube near the main body of the smoke detector, including a T-shaped three-way ball valve and a high-speed fan; the horizontal pipe of the three-way ball valve is connected to the sampling tube, and the vertical pipe is connected to the high-speed fan; by utilizing the cooperation of the high-speed fan and the three-way ball valve, high-speed airflow is guided to the sampling tube, thereby cleaning the air holes of the sampling tube by blowing air. The device also includes a covered box, with the three-way ball valve placed inside the box; the top of the box is provided with a mounting hole, the shape of which matches the high-speed fan; the high-speed fan is fixedly installed in the mounting hole. The high-speed fan fits tightly with the mounting hole. The high-speed fan can inject high-speed airflow into the box, and then provide airflow to the sampling tube for cleaning by blowing air.

[0006] Preferably, the horizontal tube of the three-way ball valve is provided with a butt joint at both ends. The butt joint is cylindrical, and its inner diameter matches the inner diameter of the sampling tube. The outer wall of the butt joint has an external thread at its end, and the butt joint is threaded to the end of the sampling tube. The horizontal tube of the three-way ball valve is connected to the butt joint via a flange. Using the butt joint to install the three-way ball valve between the smoke detector and the sampling tube allows the entire device to switch between normal detection mode and purging mode.

[0007] Furthermore, the end of the connector extends out of the housing, and the side wall of the housing fits tightly with the middle of the connector. This facilitates the installation and removal of the sampling tube and the detector.

[0008] Preferably, the three-way ball valve is equipped with an electric actuator connected to the valve core. A rotating shaft is connected to the bottom of the electric actuator, which drives the valve core to rotate and adjust. This allows for remote control, switching between normal detection mode and purging mode, saving manpower.

[0009] Furthermore, the electric actuator is located outside the housing. The housing and the rotating shaft are tightly fitted together. It can be directly connected to the control system without affecting the airtightness of the housing itself.

[0010] Preferably, the vertical port of the three-way ball valve is an air inlet, which is connected to the interior of the housing. A high-speed fan injects high-speed airflow into the housing, which then enters the three-way ball valve and the sampling tube through the air inlet, thereby rinsing the sampling tube.

[0011] Furthermore, the enclosure contains at least two sampling tubes, with the air inlets of the three-way ball valves on the sampling tubes positioned opposite each other at intervals. This opposite placement of the two air inlets allows them to be positioned close to the high-speed fan simultaneously, improving the efficiency of rinsing the sampling tubes.

[0012] Furthermore, the high-speed fan is equidistant from both air inlets. This allows the high-speed airflow generated by the fan to simultaneously flow into both air inlets, thus simultaneously rinsing both sampling tubes.

[0013] The beneficial effects of this utility model are as follows: The airflow cleaning device for the smoke detector sampling tube of this utility model has the following advantages: 1. This utility model utilizes a combination of a high-speed fan and a three-way ball valve. After the three-way ball valve is opened, the high-speed fan can send high-speed airflow into the sampling tube and spray it in reverse through the sampling hole of the sampling tube, thus solving the problem of accumulated fiber dust clogging the sampling hole and improving the sampling effect.

[0014] 2. This utility model arranges the three-way ball valves of multiple sampling tubes in the same box. When different three-way ball valves are opened, the high-speed fan can send airflow to different sampling tubes. Therefore, this device can be responsible for the blowing and unblocking of multiple sampling tubes. It has a compact structure, is easy to operate, and helps to reduce the cost of parts. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the airflow cleaning device for the smoke detector sampling tube in Embodiment 1 of this utility model (the high-speed fan and housing are not shown). Figure 2 This is a schematic diagram of the airflow cleaning device for the smoke detector sampling tube in Embodiment 2 of this utility model; Figure 3 yes Figure 2 Side view; Figure 4 yes Figure 3 AA section view; Figure 5 yes Figure 4 Enlarged view of I; Figure 6 This is a schematic diagram of the device before it is started; Figure 7 This is a schematic diagram of the principle for starting the device.

[0016] In the diagram: 1. Three-way ball valve, 11. Valve core, 12. Air inlet, 13. Electric actuator, 131. Shaft, 2. Connector, 3. Sampling tube, 4. High-speed fan, 5. Housing.

[0017] The dashed line in the diagram indicates the position of the valve core of the three-way ball valve.

[0018] The arrows in the diagram indicate the direction of airflow. Detailed Implementation

[0019] Example 1: See Figure 1 An airflow cleaning device for a smoke detector sampling tube is disclosed, installed on the sampling tube 3 near the main body of the smoke detector. It includes a T-shaped three-way ball valve 1 and a high-speed fan 4. The horizontal tube of the three-way ball valve 1 connects to the sampling tube 3, and the vertical tube connects to the high-speed fan 4. The high-speed fan 4 and the three-way ball valve 1 work together to guide high-speed airflow to the sampling tube 3, thereby cleaning the air holes of the sampling tube 3. The device also includes a covered housing 5, with the three-way ball valve 1 placed inside the housing 5. A mounting hole is provided on the top of the housing 5, the shape of which matches the high-speed fan 4. The high-speed fan 4 is fixedly installed in the mounting hole, fitting tightly with it. The high-speed fan 4 injects high-speed airflow into the housing 5, then provides airflow to the sampling tube 3 for cleaning.

[0020] The three-way ball valve 1 has connectors 2 at both ends of its horizontal tube. Connectors 2 are cylindrical, and their inner diameter matches that of the sampling tube 3. The outer wall of connector 2 has external threads at its end, which connect to the end of the sampling tube 3. The horizontal tube of the three-way ball valve 1 is connected to connector 2 via a flange. Using connectors 2 to install the three-way ball valve 1 between the smoke detector and the sampling tube 3 allows the entire device to switch between normal detection mode and purging mode.

[0021] The end of connector 2 extends out of housing 5, and the side wall of housing 5 fits tightly with the middle of connector 2. This facilitates the installation and removal of sampling tube 3 and detector.

[0022] An electric actuator 13 is installed on the three-way ball valve 1, which is connected to the valve core 11 of the three-way ball valve 1. A rotating shaft 131 is connected to the bottom of the electric actuator 13, which drives the valve core 11 to rotate and adjust. It can be remotely controlled and can switch between normal detection mode and purging mode, saving manpower.

[0023] The electric actuator 13 is located outside the housing 5. The housing 5 is tightly fitted with the rotating shaft 131. It can be directly connected to the control system without affecting the airtightness of the housing 5 itself.

[0024] The vertical port of the three-way ball valve 1 is the air inlet 12, which is connected to the interior of the housing 5. The high-speed fan 4 injects high-speed airflow into the housing 5, and then enters the three-way ball valve 1 and the sampling tube 3 through the air inlet 12, thereby rinsing the sampling tube 3.

[0025] The working process of this embodiment includes the following steps: ① Start the electric actuator 13 to connect the sampling tube 3 to be cleaned to the box 5. At this time, the smoke detector is separated from the sampling tube 3. ② Start the high-speed fan 4 to blow high-speed airflow into the three-way ball valve 1, which then enters the sampling tube 3 through the connector 2; ③ A high-speed airflow is blown out from the sampling tube 3, blowing out the debris in the pores.

[0026] Example 2: See Figure 2-7 Example 2 is basically the same as Example 1, and the similarities will not be repeated. The differences are: The housing 5 is equipped with two three-way ball valves 1, with their air inlets 12 positioned opposite each other. This opposite arrangement of the two air inlets 12 allows them to be positioned close to the high-speed fan 4 simultaneously, improving the rinsing efficiency of the sampling tube 3.

[0027] The high-speed fan 4 is positioned at the same distance from both air inlets 12. This allows the high-speed airflow generated by the high-speed fan 4 to simultaneously flow into both air inlets 12 and clean both sampling tubes 3.

Claims

1. A smoke detector sampling tube airflow cleaning device, installed on the sampling tube near the main body of the smoke detector, characterized in that, The device includes a T-shaped three-way ball valve and a high-speed fan; the horizontal tube of the three-way ball valve is connected to the sampling tube, and the vertical tube is connected to the high-speed fan; the device also includes a covered housing, in which the three-way ball valve is placed; the top of the housing is provided with a mounting hole, the shape of which matches the high-speed fan; the high-speed fan is fixedly installed in the mounting hole.

2. The airflow cleaning device for the smoke detector sampling tube according to claim 1, characterized in that: The three-way ball valve has a connector at both ends of the horizontal tube. The connector is a round tube and its inner diameter matches the inner diameter of the sampling tube. The outer wall of the connector has an external thread at its end, and the connector is threaded to the end of the sampling tube.

3. The airflow cleaning device for the sampling tube of the smoke detector according to claim 1, characterized in that: The three-way ball valve is equipped with an electric actuator, which is connected to the valve core of the three-way ball valve.

4. The airflow cleaning device for the sampling tube of the smoke detector according to claim 3, characterized in that: The electric actuator is located on the outside of the housing.

5. The airflow cleaning device for the sampling tube of the smoke detector according to claim 1, characterized in that: The vertical pipe port of the three-way ball valve is the air inlet, which is connected to the interior of the housing.

6. The airflow cleaning device for the sampling tube of the smoke detector according to claim 5, characterized in that: The box contains at least two sampling tubes, with the air inlets of the three-way ball valves on the sampling tubes spaced apart from each other.

7. The airflow cleaning device for the sampling tube of the smoke detector according to claim 6, characterized in that: The high-speed fan is equidistant from both air inlets.

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