Beam tube blowback structure of multi-path gas fire monitoring device

Abstract

The utility model discloses a beam tube blowback structure of a multi-channel gas fire monitoring device, which comprises a plurality of beam tubes and a sucking pump, a multi-channel beam tube switching valve group is arranged between the beam tubes and the sucking pump, the multi-channel beam tube switching valve group comprises a plurality of switching valves which are in one-to-one correspondence with the beam tubes and are communicated with the beam tubes, and the plurality of switching valves are communicated with the sucking pump. Exhaust ports of all the switching valves are communicated with an exhaust pipe and an air extracting pump; a gas reversing valve is arranged on the exhaust pipe, a pressure sensor and a compressed gas source control valve communicated with the gas reversing valve are arranged on the gas reversing valve, and the compressed gas source control valve is communicated with a compressed gas tank; the pressure sensor is in communication connection with a controller and is used for detecting the air pressure in the exhaust pipe in real time and transmitting the detected air pressure value to the controller, and the controller is connected with the compressed air source control valve and is used for receiving the air pressure value sent by the pressure sensor; and an opening or closing signal is sent to the compressed air source control valve and the air reversing valve according to the air pressure value.

Description

Technical Field

[0001] This utility model relates to the field of mining goaf fire monitoring equipment, specifically to a bundle tube backflush structure for a multi-channel gas fire monitoring device. Background Technology

[0002] With mine restructuring and years of continuous mining, numerous goaf areas have formed beneath coal production bases. Various types of mine fires occur frequently, causing substantial direct and indirect economic losses. To prevent mine fires, a wireless sensor was developed to detect the characteristics of spontaneous combustion of coal in these goaf areas. This sensor can monitor indicative gases of spontaneous combustion in underground goaf areas in a timely manner, buying valuable time for escape and prevention of spontaneous combustion.

[0003] Currently, the traditional monitoring methods for environmental areas such as goafs and working faces in coal mines mainly involve manual sampling and ground-based chromatographic detection. While this monitoring method provides accurate data, it limits the number of samples that can be taken each day. The time interval between gas sampling and gas detection is at least several hours, and in some cases, the data from the previous day cannot be viewed until the next day. This completely fails to guarantee the real-time validity of the data. Furthermore, increasing the number of monitoring points significantly increases the need for manpower and resources.

[0004] To address this issue, the applicant proposes designing a multi-channel gas fire detection device capable of extracting gas from multiple goaf areas and analyzing the gas within a specific wavelength range using a laser sensor. This device comprises multiple bundled tubes with ends corresponding to different goaf areas, a multi-channel control valve group controlling the opening and closing of each bundled tube, an extraction pump connected to the multi-channel control valve group, and a laser sensor connected to the exhaust port of the extraction pump. After the laser sensor detects the corresponding gas concentration, the device analyzes the gas concentration to determine if a fire hazard exists. Because the air extracted by the extraction pump contains a large amount of dust, the bundled tubes will become clogged to varying degrees after prolonged operation. Failure to promptly clear the clogged tubes will affect the service life of the extraction pump and also impair fire monitoring. Currently, when a bundle tube becomes blocked, the traditional method is to manually check and handle it segment by segment. Although this method can clear the blockage, it is time-consuming and labor-intensive. In addition, the bundle tube must be cut into segments for inspection. As the number of connection joints in the bundle tube increases, the airtightness of the bundle tube will also be greatly compromised, which will cause great inconvenience to the later maintenance of the bundle tube. If multiple bundle tubes are blocked, the workload of cleaning the bundle tubes will be even greater. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a bundle tube backflushing structure for a multi-channel gas fire monitoring device, which solves the problem that after the bundle tube of the existing fire detection device becomes blocked after long-term use, manual inspection and clearing are required, which is time-consuming and labor-intensive, and the inspection process will affect the airtightness of the bundle tube.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A bundle-tube backflushing structure for a multi-channel gas fire monitoring device includes multiple bundle tubes and an extraction pump. A multi-channel bundle tube switching valve group is also provided between the bundle tubes and the extraction pump. The multi-channel bundle tube switching valve group includes multiple switching valves that correspond one-to-one with and are connected to the bundle tubes. The exhaust ports of all switching valves are connected to an exhaust pipe and the extraction pump. A gas reversing valve is provided on the exhaust pipe, and a pressure sensor and a compressed air source control valve connected to the gas reversing valve are provided on the gas reversing valve. The compressed air source control valve is connected to a compressed air tank. The pressure sensor is communicatively connected to a controller for real-time detection. The system measures the air pressure inside the exhaust pipe and transmits the detected pressure value to a controller. The controller is connected to a compressed air source control valve and receives the air pressure value from the pressure sensor. Based on the air pressure value, the controller sends an open or closed signal to the compressed air source control valve. When the compressed air source control valve receives a closed signal, it closes, and the passage between the gas reversing valve and the compressed air source control valve is closed. When the compressed air source control valve receives an open signal, it opens, the passage between the gas reversing valve and the compressed air source control valve is connected, and the passage between the gas reversing valve and the air pump is closed. In this way, during the monitoring process, one of the switching valves in the multi-channel bundle tube switching valve group is opened one by one. When the air pump is drawing air, the bundle tube corresponding to the switching valve is connected, and the air in the corresponding area at the end of the bundle tube is drawn into the air pump through the bundle tube, the switching valve, and the exhaust pipe. At the same time as the air is drawn in, the pressure sensor connected to the exhaust pipe can monitor the air pressure in the exhaust pipe in real time and transmit the air pressure value to the controller. The controller then determines the negative pressure of the air in the bundle tube based on the air pressure value. If the negative pressure value is within the preset range, the bundle tube is determined to be unobstructed, the compressed air source control valve is closed, and the passage between the compressed air source control valve and the gas reversing valve is closed. If the negative pressure value is outside the set range, the bundle tube is determined to be blocked, and the controller... An opening command is sent to the compressed air source control valve, which opens the valve. The passage between the gas reversing valve and the suction pump is closed. The positive pressure air from the compressed air tank passes through the compressed air source control valve, the gas reversing valve, and the switching valve corresponding to the blocked bundle tube in sequence, and then moves towards the blocked bundle tube. At this time, the gas movement direction is opposite to the flow direction when the suction pump is turned on, which backflushes the bundle tube. This allows the blockages such as coal dust and slag to be blown out of the bundle tube under the push of high-pressure gas, thus clearing the bundle tube. After a certain period of time, the controller sends a closing signal to the compressed air source control valve to complete the clearing process. Then, the passage between the gas reversing valve and the suction pump is opened, and the suction pump is started to monitor and check the next bundle tube.This method eliminates the need for manual inspection of each bundle tube. During operation, the air pressure of the bundle tubes is monitored and assessed in real time. Changes in air pressure indicate whether a blockage has occurred. If a blockage is found, compressed air is used to backflush out the obstruction from the bundle tube. This eliminates the need to cut open the blocked bundle tube for cleaning, effectively ensuring the sealing of the bundle tubes after cleaning. It also clearly identifies which bundle tube is blocked. The inspection method is simple, quick, and requires no additional equipment, saving manpower and resources.

[0008] Furthermore, a pressure reducing valve is installed between the compressed air tank and the compressed air source control valve. This pressure reducing valve reduces the pressure of the high-pressure gas in the compressed air tank, ensuring it meets the strength requirements of the compressed air source control valve.

[0009] Furthermore, the controller includes a communication module and a data processing module. Thus, the communication module is used to receive and send information, and the data processing module is used to process the received information.

[0010] Furthermore, the gas reversing valve is a two-position three-way reversing valve, including a first normally open passage between the exhaust pipe and the gas reversing valve, a second passage between the gas reversing valve and the compressed air source control valve, and a third passage between the gas reversing valve and the suction pump. The controller is communicatively connected to the gas reversing valve. When the controller sends an open signal to the compressed air source control valve, it simultaneously sends an open signal to the second passage of the gas reversing valve and a close signal to the third passage. Thus, the gas reversing valve has three channels, where the second and third passages are opened or closed respectively during unblocking and normal fire monitoring, meeting the needs of the fire monitoring device under different operating conditions. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the gas flow direction when the compressed air source control valve is opened to backflush and clear the blockage after the bundle tube blockage is detected in the embodiment.

[0012] Figure 2 This is a schematic diagram of the gas flow direction of the bundle tube backflushing structure during normal fire monitoring and bundle tube blockage troubleshooting in the embodiment. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0014] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0015] like Figure 1 , Figure 2As shown, the bundle tube backflush structure of the multi-channel gas fire monitoring device provided in this embodiment includes multiple bundle tubes 1 and an air pump 4. A multi-channel bundle tube switching valve group 2 is also provided between the bundle tubes 1 and the air pump 4. The multi-channel bundle tube switching valve group 2 includes multiple switching valves that correspond one-to-one with and are connected to the bundle tubes 1. The exhaust ports of all switching valves are connected to an exhaust pipe 21 and the air pump 4. A gas reversing valve 3 is provided on the exhaust pipe 21. A pressure sensor 5 and a compressed air source control valve 7 connected to the gas reversing valve 3 are provided on the gas reversing valve 3. The compressed air source control valve 7 is connected to a compressed air tank 8. The pressure sensor 5 is communicatively connected to a controller 6. The system is used to detect the air pressure in the exhaust pipe 21 in real time and transmit the detected air pressure value to the controller 6. The controller 6 is connected to the compressed air source control valve 7 and is used to receive the air pressure value sent by the pressure sensor 5 and send an open or close signal to the compressed air source control valve 7 according to the air pressure value. When the compressed air source control valve 7 receives the close signal, the compressed air source control valve 7 closes and the channel between the gas reversing valve 3 and the compressed air source control valve 7 is closed. When the compressed air source control valve 7 receives the open signal, the compressed air source control valve 7 opens and the channel between the gas reversing valve 3 and the compressed air source control valve 7 is connected, while the channel between the gas reversing valve 3 and the air pump 4 is closed.

[0016] With the backflush structure in this embodiment, during fire monitoring, one of the switching valves in the multi-channel bundle tube switching valve group 2 is opened one by one. When the air pump 4 is drawing air, the bundle tube 1 corresponding to the switching valve is connected, and the air from the goaf area at the end of the bundle tube 1 is drawn into the air pump 4 through the bundle tube 1, the switching valve, and the exhaust pipe 21. At the same time as the air is drawn, the pressure sensor 5 connected to the exhaust pipe 21 can monitor the air pressure of the exhaust pipe 21 in real time and transmit the air pressure value to the controller 6. The controller 6 then determines the negative pressure of the air in the bundle tube 1 based on the air pressure value. If the negative pressure value is ≥-65kPa, the bundle tube 1 is determined to be unobstructed, the compressed air source control valve 7 is closed, and the channel between the compressed air source control valve 7 and the gas reversing valve 3 is closed (e.g., Figure 2 (As shown); if the negative pressure value is < -65 kPa, it is determined that the bundle tube 1 is blocked. The controller 6 sends an opening command to the compressed air source control valve 7, the compressed air source control valve 7 opens, the channel between the gas reversing valve 3 and the suction pump 4 is closed, and the positive pressure air from the compressed air tank 8 passes through the compressed air source control valve 7, then through the gas reversing valve 3 and the switching valve corresponding to the blocked bundle tube 1, and moves towards the blocked bundle tube 1. At this time, the gas movement direction is opposite to the flow direction when the suction pump 4 is turned on, backflushing the bundle tube 1 (e.g. Figure 1As shown in the figure, the blockage of coal dust, coal slag and other obstructions can be blown out of the bundle tube 1 under the push of high pressure gas, so that the bundle tube 1 is unobstructed. After a certain period of time, the controller 6 sends a closing signal to the compressed air source control valve 7 to complete the unblocking. Then the passage between the gas reversing valve 3 and the air pump 4 is opened, and the air pump 4 is started to monitor and check the next bundle tube 1. This method eliminates the need for manual inspection of each tube 1. During operation, the air pressure of each tube 1 is monitored and assessed in real time. Changes in air pressure indicate blockage. If a blockage occurs, the pressure difference between compressed air and the blocked tube 1 forces the clogged material (such as slag, dust, or mud) out through the air inlet, effectively backflushing the blocked tube 1. This eliminates the need to cut open the blocked tube 1 for cleaning, ensuring a tight seal after cleaning. It also clearly identifies which tube 1 is blocked. The inspection method is simple, quick, and requires minimal additional equipment, saving manpower and resources.

[0017] In practice, regular inspections can be conducted, or the blockage of the tube can be checked during fire monitoring. The backflushing time can be set based on actual experience, and the inspection frequency can also be set according to specific circumstances.

[0018] Furthermore, a pressure reducing valve 9 is installed between the compressed air tank 8 and the compressed air source control valve 7. This pressure reducing valve 9 reduces the pressure of the high-pressure gas in the compressed air tank 8, effectively protecting the relevant connectors and components on the pipeline from damage due to excessive pressure.

[0019] Furthermore, the controller 6 includes a communication module and a data processing module. Thus, the communication module is used to receive and send information, and the data processing module is used to process the received information.

[0020] Furthermore, the gas reversing valve 3 is a two-position three-way reversing valve, including a first normally open passage between the exhaust pipe 21 and the gas reversing valve 3, a second passage between the gas reversing valve 3 and the compressed air source control valve 7, and a third passage between the gas reversing valve 3 and the suction pump 4. The controller 6 is communicatively connected to the gas reversing valve 3. When the controller 6 sends an opening signal to the compressed air source control valve 7, it simultaneously sends an opening signal to the second passage of the gas reversing valve 3 and a closing signal to the third passage of the gas reversing valve 3. In this way, the gas reversing valve 3 has three channels, wherein the second and third passages are opened or closed respectively during unblocking and normal fire monitoring, which can meet the use of the fire monitoring device under different operating conditions.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A backflushing structure of a bundle tube of a multi-path gas fire monitoring device, comprising a plurality of bundle tubes and a gas suction pump, characterized in that, A plurality of switching valves corresponding to the beam tubes are arranged in the beam tube switching valve group, and the exhaust ports of all the switching valves are communicated with an exhaust pipe and an air pump; a gas reversing valve is arranged on the exhaust pipe, a pressure sensor is arranged on the gas reversing valve, and a compressed gas source control valve is communicated with the gas reversing valve, wherein the compressed gas source control valve is communicated with a compressed gas tank; the pressure sensor is communicated with a controller, which is used for detecting the air pressure in the exhaust pipe in real time and transmitting the detected air pressure value to the controller; the controller is connected with the compressed gas source control valve, which is used for receiving the air pressure value sent by the pressure sensor and sending an opening or closing signal to the compressed gas source control valve according to the air pressure value; when the closing signal is received, the compressed gas source control valve is closed, and the channel between the gas reversing valve and the compressed gas source control valve is closed; when the opening signal is received, the compressed gas source control valve is opened, the channel between the gas reversing valve and the compressed gas source control valve is communicated, and the channel between the gas reversing valve and the air pump is closed.

2. The bundle tube backflush structure of the multi-path gas fire monitoring device according to claim 1, characterized in that, A pressure reducing valve is arranged between the compressed gas tank and the compressed gas source control valve.

3. The bundle tube backflush structure of a multipath gas fire monitoring device according to claim 1 or 2, characterized in that, The controller comprises a communication module and a data processing module.

4. The bundle tube backflush structure of a multipath gas fire monitoring device according to claim 3, characterized in that, The gas reversing valve is a two-position three-way reversing valve, which comprises a first normally open channel between the exhaust pipe and the gas reversing valve, a second channel between the gas reversing valve and the compressed gas source control valve, and a third channel between the gas reversing valve and the air pump; the controller is communicated with the gas reversing valve, and when the controller sends the opening signal to the compressed gas source control valve, the controller sends the opening signal to the second channel of the gas reversing valve and the closing signal to the third channel of the gas reversing valve at the same time.

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