Pipeline gas taking device and gas detection system

Abstract

The utility model discloses a pipeline gas taking device and a gas detection system, the pipeline gas taking device comprises a shell, the outer side of the shell is provided with an arc-shaped groove extending and penetrating along the axial direction, the arc-shaped groove is internally provided with a cylindrical gas taking head in a protruding manner along the radial direction, the gas taking head is provided with at least two gas holes arranged along the axial direction, and the gas holes are communicated with the arc-shaped groove. One end of the air hole is communicated with the shell, and the other end of the air hole is communicated with the outer circular surface or the end surface of the air taking head; air taps coaxially communicated with the air holes are arranged in the shell in a protruding mode. The pipeline gas taking device has the advantages of being simple in structure, convenient to install and the like, and the gas detection system is beneficial to reducing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine equipment, in particular to a pipeline gas extraction device and a gas detection system. Background Art

[0002] Gas is usually mined during coal mining. Gas can be used as fuel and as a raw material for manufacturing substances such as hydrogen. It is necessary to collect and transport the gas in coal mining. During the pipeline transportation of gas, it is necessary to detect the gas flow rate and concentration (CH4 concentration, CO concentration, O2 concentration, etc.) in the gas pipeline. Since the extraction of gas during gas concentration detection will cause disturbances and affect the accuracy of flow rate measurement, independent equipment is usually used for detection. To this end, the applicant has designed a gas flow rate and concentration measurement device in a high negative pressure environment in the pipeline, with the publication number CN116877931A. The gas flow rate and gas concentration detection can be completed with one device, which reduces the detection equipment and reduces the layout cost to a certain extent. However, multiple detection points need to be deployed in the coal mine. If a set of detection devices is set at each detection point, the layout cost will be greatly increased. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a pipeline gas extraction device with a simple structure and convenient installation, and a gas detection system that is conducive to reducing costs.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A pipeline air extraction device, characterized in that it includes a shell, the outer side of the shell has an arcuate groove extending axially through, a cylindrical air extraction head is radially protruding in the arcuate groove, the air extraction head has at least two axially arranged air holes, one end of the air hole is connected to the shell, and the other end is connected to the outer circular surface or end surface of the air extraction head; air nozzles are protruding in the shell and coaxially penetrate the air holes.

[0006] When in use, the arc groove on the shell can be matched with the surface of the pipe, so that the arc groove and the pipe are set in the same direction, so as to ensure that the relative position of the air hole and the pipe is fixed, and the consistency and reliability of the air intake conditions are guaranteed. The air nozzle protruding from the shell can be easily connected to the air pipe. The above-mentioned air extraction device has a reasonable structural design, is easy to install, and is convenient to be arranged at different detection points. It only needs to be connected to the detection equipment through the air pipe to complete the detection of the detection point. There is no need to fix expensive detection equipment at each detection point, which greatly reduces the equipment cost.

[0007] Furthermore, the air holes include full-pressure air holes and static-pressure air holes which are symmetrically arranged along the radial direction of the air intake head; the full-pressure air holes and static-pressure air holes pass through the outer circular surface of the air intake head in a deflected manner away from one end of the air nozzle, and form a full-pressure air port and a static-pressure air port respectively; the full-pressure air port and the static-pressure air port are arranged opposite to each other along the axial direction of the arc groove.

[0008] In this way, since the total pressure air port and the static pressure air port are arranged opposite to each other in the axial direction of the arc groove, the total pressure air port and the static pressure air port extending into the pipeline are respectively facing the inflow direction and the outflow direction of the gas, so that the total pressure data and the static pressure data in the pipeline can be obtained to obtain the flow velocity.

[0009] Furthermore, the air holes include an air inlet hole and an air outlet hole which are arranged through the axial direction of the air extraction head.

[0010] In this way, the gas in the pipeline can flow through the detection device through the air inlet and the air outlet, so as to detect different gas concentrations in the gas.

[0011] Furthermore, the air inlet and the air outlet are symmetrically arranged along the radial direction of the air extraction head.

[0012] Furthermore, the shell and the air extraction head are integrally injection molded.

[0013] Furthermore, it also includes a solenoid valve for controlling the on-off of the gas circuit, the solenoid valve is arranged in a one-to-one correspondence with the gas nozzle, and the air inlet end of the solenoid valve is connected to the gas nozzle through a pipeline.

[0014] In this way, the electromagnetic valve can be used to control the cutting off or opening of all the air holes of the air extraction device, so that only some of the detection points can be detected.

[0015] A gas detection system, characterized in that it includes the pipeline gas extraction device as described above and a detection device for detecting gas concentration or gas flow rate, wherein the detection device has a detection airway arranged in a one-to-one correspondence with the gas nozzle, and the detection airway is connected to the corresponding gas nozzle in an on-off manner through an air pipe.

[0016] Furthermore, there are at least two pipeline air intake devices, and a multi-air channel module is also arranged between the detection device and the pipeline air intake device. The multi-air channel module has multiple independent air channels, and the number of the multiple air channels matches the number of air nozzles on the pipeline air intake device, and the number of interfaces of the multiple air channels is greater than the number of pipeline air intake devices; the detection air channels of the detection device are respectively connected to different interfaces of the multiple air channels through air pipes, and the air nozzles of the pipeline air intake device are respectively connected to corresponding interfaces of the multiple air channels through air pipes in a switchable manner.

[0017] Furthermore, a solenoid valve for controlling the on-off of the gas path is connected between the gas nozzle of the pipeline gas extraction device and the interface of the multi-air channel.

[0018] Furthermore, the multi-air channel includes a valve seat in the shape of an elongated strip, the solenoid valve is arranged on the valve seat side by side along the length direction of the valve seat, and the valve seat has a first air channel and a second air channel which are coaxially connected to the air outlet and the air inlet of the solenoid valve respectively; the valve seat has an air outlet extending along the length direction, and the air outlet is connected to all the first air channels; the valve seat has an air inlet extending along the width direction, and the air inlet is connected to the second air channels in a one-to-one correspondence; the detection air channel of the detection device is connected to the corresponding air outlet on the multi-air channel through an air pipe, and the air nozzle of the pipeline air intake device is connected to the corresponding air inlet on the multi-air channel through an air pipe.

[0019] In summary, the pipeline gas extraction device of the utility model has the advantages of simple structure and convenient installation, and the gas detection system is conducive to reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 and Figure 2 This is a structural schematic diagram of the pipeline gas extraction device.

[0021] Figure 3 Schematic diagram of the principle structure of the detection device.

[0022] Figure 4 It is a schematic diagram of the structure of multiple air channels and solenoid valves.

[0023] Figure 5 This is a schematic diagram of the connection between the multi-airway module and the pipeline air intake device. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the embodiments.

[0025] In specific implementation: a gas detection system includes a detection device 6 for detecting gas concentration and flow rate and a pipeline gas extraction device, such as Figure 1 and Figure 2 As shown, the pipeline air extraction device includes a shell 1, the outer side of the shell 1 has an arc groove 2 extending through the axial direction, a cylindrical air extraction head 3 is radially protruding in the arc groove 2, the air extraction head 3 has at least two axially arranged air holes, one end of the air hole is connected to the shell 1, and the other end is connected to the outer circular surface or end surface of the air extraction head 3; the shell 1 is protruding with air nozzles 4 coaxially connected to the air holes; the detection device 6 has detection air channels arranged one by one with the air nozzles 4, and the detection air channels are connected to the corresponding air nozzles 4 through air pipes in a switchable manner.

[0026] The air holes include full-pressure air holes 31 and static-pressure air holes 32 which are symmetrically arranged along the radial direction of the air extraction head 3. The full-pressure air holes 31 and static-pressure air holes 32 deflect through the outer circumferential surface of the air extraction head 3 at one end away from the air nozzle 4, and form a full-pressure air port and a static-pressure air port respectively; the full-pressure air port and the static-pressure air port are arranged opposite to each other along the axial direction of the arc-shaped groove 2, such as Figure 2 shown.

[0027] like Figure 3 As shown, the detection device 6 includes a flow rate detection module 61, and the flow rate detection module 61 includes a Pitot tube group 611 and a differential pressure element 612 for detecting total pressure and static pressure data. The Pitot tube group 611 includes a total pressure tube and a static pressure tube arranged side by side, and the total pressure tube and the static pressure tube are respectively connected to the corresponding differential pressure element 612 through pipelines; the total pressure tube and the static pressure tube can be connected to the air nozzle 4 of the total pressure air hole 31 and the static pressure air hole 32 respectively and correspondingly in an on-off manner.

[0028] In this embodiment, the air hole also includes an air inlet hole 33 and an air outlet hole 34 which are arranged through the axial direction of the air intake head 3, and the air inlet hole 33 and the air outlet hole 34 are arranged symmetrically along the radial direction of the air intake head 3. The detection device 6 also includes a concentration detection module 62, and the concentration detection module 62 includes an air inlet pipe 621 and an air outlet pipe 622, and the air inlet pipe 621 and the air outlet pipe 622 are sequentially connected with a first air inlet filter 623, an air pump assembly 624 and a gas sensor module 625 for detecting gas concentration through pipelines. The air inlet pipe 621 and the air outlet pipe 622 can be connected to the air nozzles 4 of the air inlet hole 33 and the air outlet hole 34 respectively in an on-off manner.

[0029] Specifically, the concentration detection module 62 also includes a first solenoid valve 626 and a second solenoid valve 627. The first solenoid valve 626 is connected between the gas sensor module 625 and the outlet pipe 622, and is used to control the on-off of the air path between the gas sensor module 625 and the outlet pipe 622; the second solenoid valve 627 is connected between the first air intake filter 623 and the air pump assembly 624, and the second solenoid valve 627 also has an air vent connected to the atmosphere. The second solenoid valve 627 is used to switch the air pump assembly 624 to communicate with the first air intake filter 623 or the atmosphere.

[0030] The flow rate detection module 61 also includes a fourth solenoid valve 613 and a fifth solenoid valve 614, which are respectively connected between the total pressure pipe and the static pressure pipe and the corresponding differential pressure element 612, and the fourth solenoid valve 613 and the fifth solenoid valve 614 also have interconnected connecting ports; the fourth solenoid valve 613 is used to switch the pressure difference element 612 to connect to the corresponding total pressure pipe or connecting port, and the fifth solenoid valve 614 is used to switch the pressure difference element 612 to connect to the corresponding static pressure pipe or connecting port.

[0031] When in use, the gas extraction head of the pipeline gas extraction device is inserted into the pipeline, and the arc groove 2 on the shell 1 is wrapped around the pipeline, so that the arc groove and the pipeline are arranged in the same direction to ensure that the relative position of the air hole and the pipeline is fixed, especially so that the full-pressure air port and the static pressure air port inserted into the pipeline can face both ends in the gas flow direction. When measuring, the full-pressure pipe, static pressure pipe, air inlet pipe and air outlet pipe are respectively connected to the air nozzles of the full-pressure air hole 31, static pressure air hole 32, air inlet 33 and air outlet 34 of the pipeline gas extraction device. The gas flow rate is detected first, and then the gas concentration is detected. During the flow rate measurement process, there is no need to interfere with the gas in the gas pipeline, and the gas state in the pipeline, including the local gas concentration, will not be affected. After completing the flow rate measurement, start the vacuum pump assembly to extract the gas in the gas pipeline. Since there are many impurities in the coal mine gas pipeline, a first air intake filter is set between the air intake pipe and the vacuum pump assembly to filter out the impurities, thereby avoiding blockage of the gas path by impurities, thereby increasing reliability and extending the service life of the equipment. The filtered gas flows through the gas sensor module to measure the gas concentration.

[0032] Since the measuring device of the present embodiment is always located outside the gas pipeline during use, and the vacuum pump assembly needs to extract the pipeline gas under negative pressure, the two sides of the leather cup of the vacuum pump assembly are subjected to a large pressure difference (the pressure difference between atmospheric pressure and pipeline negative pressure), and it is difficult to start and efficiently pump gas when the power of the vacuum pump assembly meets the national standard and coal mining industry standard. In order to ensure that the gas pump assembly can be started reliably, based on the above structure, when performing concentration measurement, the first solenoid valve and the second solenoid valve can be closed first, the air path between the gas sensor module and the air outlet pipe can be cut off, and the vacuum pump assembly can be connected to the atmosphere, so that the vacuum pump assembly and its air inlet section are both under atmospheric pressure, the pressure difference on both sides of the leather cup is reduced, the vacuum pump assembly is started to pump gas, and the pressure of the gas sensor module is increased. After reaching the first set time or pressure, the first solenoid valve is opened to connect the air path between the gas sensor module and the air outlet pipe, the pressure of the gas sensor module is released, and the pressure is kept higher than the pipeline pressure; in this way, the air flow rate in the gas sensor module can be stabilized. After reaching the second set time, open the second solenoid valve, connect the vacuum pump assembly to the first air inlet filter, and keep the pressure of the gas sensor module higher than the pipeline pressure. On the one hand, it can maintain the stability of the airflow, and on the other hand, it can blow out the original air in the gas sensor module, allowing the gas to flow through the gas sensor module more smoothly, making the detection of gas concentration more accurate.

[0033] The pipeline gas extraction device is provided with multiple, and a multi-airway module 7 is also provided between the detection device 6 and the pipeline gas extraction device. Figure 5 As shown, the multi-air duct module 7 has multiple independent air ducts, the number of the multiple air ducts matches the number of the air nozzles 4 on the pipeline air intake device, and the number of interfaces of the multiple air ducts is greater than the number of the pipeline air intake devices; the detection air ducts of the detection device 6 are respectively connected to different interfaces of the multiple air ducts through air pipes, and the air nozzles 4 of the pipeline air intake device are respectively connected to corresponding interfaces of the multiple air ducts through air pipes in a switchable manner.

[0034] In this embodiment, the gas nozzle 4 of the pipeline gas extraction device and the interface of the multi-ventilation channel are connected to a solenoid valve 5 for controlling the on-off of the gas path. Figure 4As shown, the multi-air channel includes a valve seat 71 in the form of an elongated strip, and the solenoid valve 5 is arranged on the valve seat 71 side by side along the length direction of the valve seat 71, and the valve seat 71 has a first air channel 72 and a second air channel 73 which are coaxially connected to the air outlet and the air inlet of the solenoid valve 5 respectively; the valve seat 71 has an air outlet channel 74 extending along the length direction, and the air outlet channel 74 is connected with all the first air channels 72; the valve seat 71 has an air inlet channel 75 extending along the width direction, and the air inlet channel 75 is connected with the second air channel 73 in a one-to-one correspondence; the detection air channel of the detection device 6 is connected to the corresponding air outlet channel on the multi-air channel through an air pipe, and the air nozzle 4 of the pipeline air intake device is connected to the corresponding air inlet channel on the multi-air channel through an air pipe.

[0035] When in use, multiple pipeline air intake devices are arranged at different positions of the pipeline respectively, and the air nozzles 4 of the full-pressure air holes 31, static-pressure air holes 32, air inlet holes 33 and air outlet holes 34 on each pipeline air intake device are respectively connected to the air inlet holes on the corresponding multi-air ducts (the full-pressure multi-air duct responsible for connecting the full-pressure air holes, the static-pressure multi-air duct responsible for connecting the static-pressure air holes, the air inlet multi-air duct responsible for connecting the air inlet holes, and the air outlet multi-air duct responsible for connecting the air outlet holes) through air pipes. Figure 5 If the gas flow rate and gas concentration of a certain detection point are to be detected, all the electromagnetic valves 5 corresponding to the pipeline gas extraction device of the detection point are opened, and connected to the detection device 6, and the detection can be performed through the detection device 6.

[0036] During specific implementation, the on-off connection between the detection device 6 and the pipeline gas extraction device can also be achieved in the following manner: a quick connector or other type of connector is reserved at the outer end of the pipeline gas extraction device, and a connector matching the pipeline gas extraction device is also reserved on the detection device 6. When testing is required, the detection device 6 is carried and connected to the pipeline gas extraction device at the testing point to complete the test.

[0037] In addition, the solenoid valve 5 can also be preset in the pipeline gas extraction device, that is, each gas nozzle 4 is connected to a solenoid valve 5, and a joint is reserved on the pipeline gas extraction device to facilitate modular assembly.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipeline gas extraction device, characterized in that: The invention comprises a shell (1), the outer side of the shell (1) having an arc-shaped groove (2) extending and penetrating in the axial direction, a cylindrical air extraction head (3) protruding in the radial direction in the arc-shaped groove (2), the air extraction head (3) having at least two air holes arranged in the axial direction, one end of the air hole being in communication with the shell (1), and the other end being in communication with the outer cylindrical surface or the end surface of the air extraction head (3); and air nozzles (4) protruding in the shell (1) and coaxially penetrating with the air holes.

2. The pipeline gas extraction device according to claim 1, characterized in that: The air holes include full-pressure air holes and static-pressure air holes which are symmetrically arranged along the radial direction of the air intake head (3); the full-pressure air holes and static-pressure air holes are deflected through the outer circumferential surface of the air intake head (3) at one end away from the air nozzle (4), and form a full-pressure air port and a static-pressure air port respectively; the full-pressure air port and the static-pressure air port are arranged opposite to each other along the axial direction of the arc-shaped groove (2).

3. The pipeline gas extraction device according to claim 1, characterized in that: The air holes comprise an air inlet hole and an air outlet hole which are arranged through the axial direction of the air extraction head (3).

4. The pipeline gas extraction device according to claim 3, characterized in that: The air inlet and the air outlet are symmetrically arranged along the radial direction of the air extraction head (3).

5. The pipeline gas extraction device according to claim 1, characterized in that: The housing (1) and the air extraction head (3) are integrally injection molded.

6. The pipeline gas extraction device according to claim 1, characterized in that: It also includes a solenoid valve (5) for controlling the on-off of the gas path, wherein the solenoid valve (5) is arranged in a one-to-one correspondence with the gas nozzle (4), and the gas inlet end of the solenoid valve (5) is connected to the gas nozzle (4) through a pipeline.

7. A gas detection system, characterized in that: It comprises a pipeline gas extraction device as claimed in any one of claims 1 to 5 and a detection device (6) for detecting gas concentration or gas flow rate, wherein the detection device (6) has a detection air channel arranged in a one-to-one correspondence with the gas nozzle (4), and the detection air channel is connected to the corresponding gas nozzle (4) through an air pipe in a disconnectable manner.

8. The gas detection system according to claim 7, characterized in that: At least two pipeline air intake devices are provided, and a multi-airway module is also provided between the detection device (6) and the pipeline air intake device. The multi-airway module has multiple independent airways, the number of the multiple airways matches the number of the air nozzles (4) on the pipeline air intake device, and the number of interfaces of the multiple airways is greater than the number of the pipeline air intake devices; the detection airways of the detection device (6) are respectively connected to different interfaces of the multiple airways through air pipes, and the air nozzles (4) of the pipeline air intake device are respectively connected to corresponding interfaces of the multiple airways through air pipes in a disconnectable manner.

9. The gas detection system according to claim 8, characterized in that: A solenoid valve (5) for controlling the on-off of the gas path is connected between the gas nozzle (4) of the pipeline gas extraction device and the interface of the multi-ventilation channel.

10. The gas detection system according to claim 9, characterized in that: The multi-air passage comprises a valve seat in the form of an elongated strip, the solenoid valve (5) is arranged on the valve seat in parallel along the length direction of the valve seat, and the valve seat has a first air passage and a second air passage which are coaxially connected to the air outlet and the air inlet of the solenoid valve (5), respectively; the valve seat has an air outlet extending along the length direction, and the air outlet is connected to all the first air passages; the valve seat has an air inlet extending along the width direction, and the air inlet is connected to the second air passage in a one-to-one correspondence; the detection air passage of the detection device (6) is connected to the corresponding air outlet on the multi-air passage through an air pipe, and the air nozzle (4) of the pipeline air intake device is connected to the corresponding air inlet on the multi-air passage through an air pipe.

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