Mine methane sensor

Abstract

The utility model discloses a mine methane sensor sets up on portable instrument, including the shell of top opening, the shell is breathable shell, is provided with sensor body in the shell, is provided with the adapter plate on sensor body, is provided with positive pin, common pole pin and negative pole pin on the adapter plate, and the positive pin stretches out from the opening of shell top, and the opening of shell top is filled with epoxy resin glue. The utility model discloses platinum hot wire of sensor body will not appear the phenomenon of burning, has the poisoning characteristic of resistance sulfide and plumbic compound, and the precision of methane concentration measurement is high, the service life of sensor is long, and the power consumption is low, can match different types of portable instrument.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology and relates to a methane sensor for mining. Background Technology

[0002] In mining operations, portable instruments worn by workers are needed to monitor the methane content in the well environment in real time to ensure personal safety. These portable instruments use either catalytic elements or infrared methane sensors to measure methane concentration. The first type of catalytic element consists of an outer elliptical shape and internal platinum hot wires for both positive and negative electrodes. When the portable instrument is powered on, the internal catalytic element heats up, similar to a filament heating up, causing a change in resistance to measure methane concentration. However, the original catalytic element has high power consumption, and the internal platinum hot wire is prone to breakage, making the instrument susceptible to damage. Furthermore, this type of catalytic element is affected by sulfides and lead compounds, leading to poisoning and decreased measurement accuracy. The second type, infrared methane sensors, measures methane concentration, but these are more expensive. Therefore, portable instruments need a highly integrated, low-cost, high-precision, and durable methane sensor. Such a portable instrument would provide high accuracy in methane measurement and a long service life, ensuring worker safety during operation. Utility Model Content

[0003] The purpose of this invention is to provide a methane sensor for mining, which solves the problems of high power consumption and low measurement accuracy caused by the easy burnout of platinum heating wire in existing methane sensors.

[0004] The technical solution adopted by this utility model is a mining methane sensor, which is installed on a portable instrument. It includes a shell with a top opening. The shell is a breathable shell. The sensor body is installed inside the shell. The sensor body is provided with an adapter plate. The adapter plate is provided with a positive electrode pin, a common electrode pin, and a negative electrode pin. The positive electrode pin extends out from the opening at the top of the shell. The opening at the top of the shell is filled with epoxy resin.

[0005] The features of this utility model also include:

[0006] The outer shell is made of copper powder particles.

[0007] The sensor body includes a circuit board and a housing with an opening at the top. The circuit board is fixed at the opening of the housing. One side of the circuit board is provided with surface mount components and an electric heating circuit. The surface mount components include a detection component and a compensation component. The electric heating circuit is located in the housing. The other side of the circuit board is provided with a pad assembly. The circuit board is fixedly connected to the adapter plate through the pad assembly.

[0008] The electric heating circuit includes a Wheatstone bridge circuit. The two ends of the Wheatstone bridge circuit are respectively connected to a positive serpentine-wound platinum heating wire and a negative serpentine-wound platinum heating wire, and the positive and negative serpentine-wound platinum heating wires are connected by wires. A compensation resistor is connected in parallel to the positive serpentine-wound platinum heating wire.

[0009] The pad assembly includes a negative pad, a positive pad, and a common pad. The negative pad, positive pad, and common pad are each connected to a pad corner by a wire. The pad corners are respectively located on the edge of the circuit board and are soldered to the adapter board.

[0010] There is one negative electrode pad, one positive electrode pad, and two common electrode pads.

[0011] There are three pad corners. Two common electrode pads are connected in series with wires, and one common electrode pad is connected in series with one pad corner. The negative electrode pad and the positive electrode pad are each connected in series with one pad corner.

[0012] There is one positive terminal pin, one negative terminal pin, and two common terminal pins. The positive terminal pin is soldered to the positive terminal pad, the negative terminal pin is soldered to the negative terminal pad, and the two common terminal pins are soldered to the common terminal pad respectively.

[0013] A detection port is provided on the bottom wall of the sensor body, and a dustproof net is installed at the detection port.

[0014] The beneficial effects of this utility model are:

[0015] This utility model of a mining methane sensor has a simple and compact structure. The platinum heating wire in the sensor body will not burn out, and it has the characteristics of resistance to sulfide and lead poisoning. It has high accuracy in measuring methane concentration. The sensor has a long service life and low power consumption, and can be matched with different types of portable instruments, making it widely applicable. At the same time, it can ensure the safety of workers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the methane sensor for mining of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the sensor body in the mining methane sensor of this utility model;

[0018] Figure 3 This is a circuit diagram of the electric heating circuit in the mining methane sensor of this utility model;

[0019] Figure 4 This is a schematic diagram of the circuit board in the mining methane sensor of this utility model.

[0020] In the diagram, 1. Copper powder particle shell, 2. Methane sensor, 3. Sensor shell, 4. Adapter board, 5. Positive pin, 6. Epoxy resin adhesive, 7. Circuit board, 8. Surface mount component, 9. Snake-wound platinum hot wire, 10. Dustproof mesh, 13. Negative pad, 14. Common pad, 15. Positive pad, 16. Wheatstone bridge circuit, 17. Positive snake-wound platinum hot wire, 18. Negative snake-wound platinum hot wire, 19. Pad corner. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the following description of this utility model, the terms "first, second, third" are used only to distinguish similar objects and do not represent a specific order of objects. It is understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0023] Unless otherwise stated, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the mechanism or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0024] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this invention is for descriptive purposes only and is not intended to limit the scope of the invention.

[0025] Example 1

[0026] This embodiment provides a methane sensor for mining, which is installed on a portable instrument. It includes a shell 1 with a top opening. The shell 1 is a breathable shell. A sensor body 2 is disposed in the shell 1. An adapter plate 4 is disposed on the sensor body 2. The adapter plate 4 is provided with a positive electrode pin 5, a common electrode pin and a negative electrode pin. The positive electrode pin 5 extends out from the opening at the top of the shell 1. The opening at the top of the shell 1 is filled with epoxy resin glue 6.

[0027] Methane gas enters the sensor body 2 through the ventilated outer shell, and the concentration of methane is obtained by the sensor body.

[0028] This embodiment represents only a preferred implementation of the mine methane sensor of this utility model. Any mine methane sensor designed using similar technical features to this utility model will fall within the protection scope of the mine methane sensor of this utility model.

[0029] Example 2

[0030] This embodiment provides a mining methane sensor, which is installed on a portable instrument. It includes a shell 1 with a top opening. The shell 1 is a copper powder particle shell, which is breathable and dustproof. A sensor body 2 is disposed in the shell 1. An adapter plate 4 is disposed on the sensor body 2. The adapter plate 4 is provided with a positive electrode pin 5, a common electrode pin, and a negative electrode pin. The positive electrode pin 5 extends from the opening at the top of the shell 1. The opening at the top of the shell 1 is filled with epoxy resin 6.

[0031] This embodiment represents only a preferred implementation of the mine methane sensor of this utility model. Any mine methane sensor designed using similar technical features to this utility model will fall within the protection scope of the mine methane sensor of this utility model.

[0032] Example 3

[0033] This embodiment provides a methane sensor for mining, which is installed on a portable instrument. It includes a shell 1 with a top opening. The shell 1 is a breathable shell. A sensor body 2 is disposed in the shell 1. An adapter plate 4 is disposed on the sensor body 2. The adapter plate 4 is provided with a positive electrode pin 5, a common electrode pin and a negative electrode pin. The positive electrode pin 5 extends out from the opening at the top of the shell 1. The opening at the top of the shell 1 is filled with epoxy resin glue 6.

[0034] The sensor body 2 includes a circuit board 7 and a body housing 3 with a top opening. The circuit board 7 is fixed at the opening of the body housing 3. One side of the circuit board 7 is provided with surface mount components 8 and an electric heating circuit 9. The surface mount components 8 include a detection component and a compensation component. The electric heating circuit 9 is located in the body housing 3. The other side of the circuit board 7 is provided with a pad assembly. The circuit board 7 is fixedly connected to the adapter plate 4 through the pad assembly.

[0035] This embodiment represents only a preferred implementation of the mine methane sensor of this utility model. Any mine methane sensor designed using similar technical features to this utility model will fall within the protection scope of the mine methane sensor of this utility model.

[0036] Example 4

[0037] This embodiment provides a mining methane sensor, which is installed on a portable instrument. It includes a shell 1 with a top opening. The shell 1 is a breathable shell. A sensor body 2 is installed inside the shell 1. The sensor body 2 is an MP-7217 microelectromechanical catalytic combustion sensor. A detection port is opened on the bottom wall of the sensor body 2. A dustproof net 10 is installed at the detection port. An adapter plate 4 is installed on the sensor body 2. The adapter plate 4 is provided with a positive electrode pin 5, a common electrode pin, and a negative electrode pin. The positive electrode pin 5 extends from the opening at the top of the shell 1. The opening at the top of the shell 1 is filled with epoxy resin 6.

[0038] The sensor body 2 includes a circuit board 7 and a body housing 3 with a top opening. The circuit board 7 is fixed at the opening of the body housing 3. One side of the circuit board 7 is provided with surface mount components 8 and an electric heating circuit 9. The surface mount components 8 include a detection component and a compensation component. The electric heating circuit 9 is located in the body housing 3. The other side of the circuit board 7 is provided with a pad assembly. The circuit board 7 is fixedly connected to the adapter plate 4 through the pad assembly.

[0039] This embodiment represents only a preferred implementation of the mine methane sensor of this utility model. Any mine methane sensor designed using similar technical features to this utility model will fall within the protection scope of the mine methane sensor of this utility model.

[0040] Example 5

[0041] This embodiment provides a mining methane sensor, which is installed on a portable instrument. It includes a shell 1 with a top opening. The shell 1 is a breathable shell. A sensor body 2 is installed inside the shell 1. The sensor body 2 is an MP-7217 microelectromechanical catalytic combustion sensor. A detection port is opened on the bottom wall of the sensor body 2. An adapter plate 4 is installed on the sensor body 2. The adapter plate 4 is provided with a positive electrode pin 5, a common electrode pin, and a negative electrode pin. The positive electrode pin 5 extends from the opening at the top of the shell 1. The opening at the top of the shell 1 is filled with epoxy resin 6.

[0042] The sensor body 2 includes a circuit board 7 and a body housing 3 with a top opening. The circuit board 7 is fixed at the opening of the body housing 3. One side of the circuit board 7 is provided with surface mount components 8 and an electric heating circuit 9. The surface mount components 8 include a detection component and a compensation component. Both the detection component and the compensation component are existing components. The surface of the detection component is covered with a precious metal catalyst, and the surface of the compensation component is covered with an inert material. The electric heating circuit 9 is located in the body housing 3. The other side of the circuit board 7 is provided with a pad assembly. The circuit board 7 is fixedly connected to the adapter plate 4 through the pad assembly.

[0043] The electric heating circuit 9 includes a Wheatstone bridge circuit 16. The two ends of the Wheatstone bridge circuit 16 are respectively connected to a positive serpentine-wound platinum heating wire 17 and a negative serpentine-wound platinum heating wire 18. The positive serpentine-wound platinum heating wire 17 and the negative serpentine-wound platinum heating wire 18 are connected by wires. A compensation resistor is connected in parallel to the positive serpentine-wound platinum heating wire 17. Both the positive serpentine-wound platinum heating wire 17 and the negative serpentine-wound platinum heating wire 18 are serpentine-shaped, which increases the heat dissipation area and avoids excessive local current in the platinum heating wire, which causes it to overheat and burn out.

[0044] The positive and negative serpentine-wound platinum heating wires 17 and 18 are used for both electric heating and as thermistors. When these wires are heated to 400–500 degrees Celsius, they encounter methane gas, which is catalytically oxidized, further heating the wires. The increase in temperature causes a corresponding increase in the resistance of the heating wires in the detection component. This change in resistance detects the temperature change. The temperature of this component is affected by ambient temperature and changes in air heat conduction (e.g., the introduction of CO2 into the air affects heat conduction). To compensate for these abnormal temperature effects, a compensation component is used. The compensation component is manufactured in the same way as the detection component, except that the detection component is covered with a catalytic material, while the compensation component is not, thus preventing catalytic combustion at the compensation component. The detection and compensation components are used in the circuit to detect the difference in their resistance values. Because these two components have different colors and inconsistent emissivity, their resistance change slopes will differ. Therefore, to achieve better temperature linearity, sometimes a fixed resistor needs to be connected in parallel with the compensation component to correct its higher resistance change slope.

[0045] This embodiment represents only a preferred implementation of the mine methane sensor of this utility model. Any mine methane sensor designed using similar technical features to this utility model will fall within the protection scope of the mine methane sensor of this utility model.

[0046] Example 6

[0047] This embodiment provides a methane sensor for mining, which is installed on a portable instrument. It includes a shell 1 with a top opening. The shell 1 is a breathable shell. A sensor body 2 is disposed in the shell 1. An adapter plate 4 is disposed on the sensor body 2. The adapter plate 4 is provided with a positive electrode pin 5, a common electrode pin and a negative electrode pin. The positive electrode pin 5 extends out from the opening at the top of the shell 1. The opening at the top of the shell 1 is filled with epoxy resin glue 6.

[0048] The sensor body 2 includes a circuit board 7 and a body housing 3 with a top opening. The circuit board 7 is fixed at the opening of the body housing 3. One side of the circuit board 7 is provided with surface mount components 8 and an electric heating circuit 9. The surface mount components 8 include a detection component and a compensation component. The electric heating circuit 9 is located in the body housing 3. The other side of the circuit board 7 is provided with a pad assembly. The circuit board 7 is fixedly connected to the adapter plate 4 through the pad assembly.

[0049] The pad assembly includes a negative pad 13, a positive pad 15, and a common pad 14. The negative pad 13, the positive pad 15, and the common pad 14 are each connected to a pad corner 19 by a wire. The pad corner 19 is respectively located on the edge of the circuit board 7 and is soldered to the adapter board 4.

[0050] This embodiment represents only a preferred implementation of the mine methane sensor of this utility model. Any mine methane sensor designed using similar technical features to this utility model will fall within the protection scope of the mine methane sensor of this utility model.

[0051] Example 7

[0052] This embodiment provides a methane sensor for mining, which is installed on a portable instrument. It includes a shell 1 with a top opening. The shell 1 is a breathable shell. A sensor body 2 is disposed in the shell 1. An adapter plate 4 is disposed on the sensor body 2. The adapter plate 4 is provided with a positive electrode pin 5, a common electrode pin and a negative electrode pin. The positive electrode pin 5 extends out from the opening at the top of the shell 1. The opening at the top of the shell 1 is filled with epoxy resin glue 6.

[0053] The sensor body 2 includes a circuit board 7 and a body housing 3 with a top opening. The circuit board 7 is fixed at the opening of the body housing 3. One side of the circuit board 7 is provided with surface mount components 8 and an electric heating circuit 9. The surface mount components 8 include a detection component and a compensation component. The electric heating circuit 9 is located in the body housing 3. The other side of the circuit board 7 is provided with a pad assembly. The circuit board 7 is fixedly connected to the adapter plate 4 through the pad assembly.

[0054] The pad assembly includes a negative pad 13, a positive pad 15, and two common pads 14. There are three pad corners 19. The two common pads 14 are connected in series by wires, and each common pad 14 is connected in series with a pad corner 19. The negative pad 13 and the positive pad 15 are each connected in series with a pad corner 19. The pad corners 19 are respectively located on the edge of the circuit board 7 and are soldered to the adapter board 4.

[0055] There is one positive terminal pin 5 and one negative terminal pin, and two common terminal pins. The positive terminal pin 5 is soldered to the positive terminal pad 15, the negative terminal pin is soldered to the negative terminal pad 13, and the two common terminal pins are soldered to the common terminal pad 14 respectively.

[0056] This embodiment represents only a preferred implementation of the mine methane sensor of this utility model. Any mine methane sensor designed using similar technical features to this utility model will fall within the protection scope of the mine methane sensor of this utility model.

[0057] Example 8

[0058] This embodiment provides a methane sensor for mining, which is installed on a portable instrument, such as... Figure 1 As shown, the device includes a housing 1 with a top opening. The housing 1 is a breathable and dustproof copper powder particle housing. A sensor body 2 is installed inside the housing 1. A detection port is opened on the bottom wall of the sensor body 2, and a dustproof mesh 10 is installed at the detection port. An adapter plate 4 is installed on the sensor body 2. The adapter plate 4 is provided with a positive electrode pin 5, two common electrode pins and a negative electrode pin. The positive electrode pin 5 extends from the opening at the top of the housing 1. The opening at the top of the housing 1 is filled with epoxy resin 6. The positive electrode pin 5 and the negative electrode pin are connected to the power supply of the portable instrument, and the common electrode pin is connected to the controller of the portable instrument.

[0059] like Figure 2 As shown, the sensor body 2 includes a circuit board 7 and a body housing 3 with a top opening. The circuit board 7 is fixed at the opening of the body housing 3. One side of the circuit board 7 is provided with surface mount components 8 and an electric heating circuit 9. The surface mount components 8 include a detection component and a compensation component. The electric heating circuit 9 is located in the body housing 3. The other side of the circuit board 7 is provided with a pad assembly. The circuit board 7 is fixedly connected to the adapter plate 4 through the pad assembly.

[0060] like Figure 3 As shown, the electric heating circuit 9 includes a Wheatstone bridge circuit 16. The two ends of the Wheatstone bridge circuit 16 are respectively connected to a positive serpentine-wound platinum heating wire 17 and a negative serpentine-wound platinum heating wire 18. The positive serpentine-wound platinum heating wire 17 and the negative serpentine-wound platinum heating wire 18 are connected by wires. A compensation resistor is connected in parallel to the positive serpentine-wound platinum heating wire 17. The positive serpentine-wound platinum heating wire 17, the negative serpentine-wound platinum heating wire 18 and the compensation resistor are soldered onto the board body of the circuit board 7 using the latest MEMS manufacturing process.

[0061] like Figure 4As shown, the pad assembly includes a negative pad 13, a positive pad 15, and two common pads 14. The two common pads 14 are connected in series by wires, and each common pad 14 is connected in series with a pad corner 19. The negative pad 13 and the positive pad 15 are each connected in series with a pad corner 19. The pad corners 19 are respectively located on the edge of the circuit board 7 and are soldered to the adapter board 4. The positive pin 5 is soldered to the positive pad 15, the negative pin is soldered to the negative pad 13, and the two common pins are respectively soldered to the common pads 14. The positive terminal of the Wheatstone bridge circuit 16 of the electric heating circuit 9 is connected to the positive pad 15, and the negative terminal of the Wheatstone bridge circuit 16 is connected to the negative pad 13. The two output terminals of the electric heating circuit 9 are respectively connected to the two common pads 14.

[0062] This embodiment represents only a preferred implementation of the mine methane sensor of this utility model. Any mine methane sensor designed using similar technical features to this utility model will fall within the protection scope of the mine methane sensor of this utility model.

[0063] The working principle of this new type of methane sensor for mining is as follows:

[0064] The positive and negative pins of the methane sensor of this invention are connected to the power supply of the portable instrument, and the common pin is connected to the controller of the portable instrument. When the toxic gas methane enters the sensor body 2 through the copper powder particle shell 1, it undergoes a heating reaction through the positive serpentine platinum hot wire 17, the compensation resistor, and the positive serpentine platinum hot wire 18. The resulting signal is accurately converted into a voltage signal by the Wheatstone bridge circuit 16 and output to the controller of the portable instrument. The voltage signal is then processed by the controller and converted into a methane concentration value.

[0065] The above provides a detailed description of a methane sensor for mining applications provided by this utility model. Specific examples have been used to illustrate the implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the structure and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A methane sensor for mining, mounted on a portable instrument, characterized in that, The housing (1) includes a top opening and is a breathable housing. A sensor body (2) is provided in the housing (1). An adapter plate (4) is provided on the sensor body (2). A positive electrode pin (5), a common electrode pin and a negative electrode pin are provided on the adapter plate (4). The positive electrode pin (5) extends from the opening at the top of the housing (1). The opening at the top of the housing (1) is filled with epoxy resin glue (6).

2. The mining methane sensor according to claim 1, characterized in that, The outer shell (1) is a copper powder particle shell.

3. The mining methane sensor according to claim 1, characterized in that, The sensor body (2) includes a circuit board (7) and a body housing (3) with an opening at the top. The circuit board (7) is fixed at the opening of the body housing (3). One side of the circuit board (7) is provided with surface mount components (8) and an electric heating circuit (9). The surface mount components (8) include a detection component and a compensation component. The electric heating circuit (9) is located in the body housing (3). The other side of the circuit board (7) is provided with a pad assembly. The circuit board (7) is fixedly connected to the adapter plate (4) through the pad assembly.

4. The mining methane sensor according to claim 3, characterized in that, The electric heating circuit (9) includes a Wheatstone bridge circuit (16), with a positive serpentine-wound platinum heating wire (17) and a negative serpentine-wound platinum heating wire (18) connected to its two ends respectively. The positive serpentine-wound platinum heating wire (17) and the negative serpentine-wound platinum heating wire (18) are connected by a wire, and a compensation resistor is connected in parallel to the positive serpentine-wound platinum heating wire (17).

5. The mining methane sensor according to claim 3, characterized in that, The pad assembly includes a negative electrode pad (13), a positive electrode pad (15), and a common electrode pad (14). The negative electrode pad (13), the positive electrode pad (15), and the common electrode pad (14) are respectively connected to pad corners (19) by wires. The pad corners (19) are respectively set on the edge of the circuit board (7) and the pad corners (19) are soldered to the adapter board (4).

6. The mining methane sensor according to claim 5, characterized in that, One negative electrode pad (13) and one positive electrode pad (15) are provided, and two common electrode pads (14) are provided.

7. The mining methane sensor according to claim 6, characterized in that, There are three pad corners (19). Two common electrode pads (14) are connected in series by wires, and one common electrode pad (14) is connected in series with one pad corner (19). The negative electrode pad (13) and the positive electrode pad (15) are each connected in series with one pad corner (19).

8. The mining methane sensor according to claim 6, characterized in that, The positive electrode pin (5) and the negative electrode pin are each provided with one, and the common electrode pin is provided with two. The positive electrode pin (5) is soldered to the positive electrode pad (15), the negative electrode pin is soldered to the negative electrode pad (13), and the two common electrode pins are respectively soldered to the common electrode pad (14).

9. The mine methane sensor according to claim 1, characterized in that, The sensor body (2) has a detection port on its bottom wall, and a dustproof net (10) is provided at the detection port.

Images