A mine explosion-proof and intrinsic safety type power supply box

Abstract

The utility model belongs to the technical field of coal mine equipment, concretely relates to a mine explosion -proof and intrinsic safety type power supply box, including first cable introduction end, transformer, filter, power module and second cable introduction end, transformer is respectively connected with first cable introduction end and filter electricity, and filter is connected between transformer and power module, power module includes a plurality of parallel connection's intrinsic safety power supply, the power supply box still includes the solenoid valve power supply loop for giving external solenoid valve power supply and the signal feedback loop for feeding back the opening and close of solenoid valve to external controller and controlling the on -off of solenoid valve power supply loop, first cable introduction end is used to introduce external power supply to power supply box and is used to make power supply box power supply solenoid valve, second cable introduction end is used to make power supply box power supply external equipment. The power supply box is more widely applicable, not only provides intrinsic safety power supply, but also can power supply solenoid valve, solves the power supply demand of coal mine site overtemperature sprinkling.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine equipment technology, specifically relating to a mine explosion-proof and intrinsically safe power supply box. Background Technology

[0002] The explosion-proof and intrinsically safe power supply box for mining is a power supply device developed for high-risk industries such as coal mines and power plants. It is mainly used to provide safe and reliable power for various electrical equipment.

[0003] The explosion-proof and intrinsically safe power supply box for mining uses an explosion-proof shell and sealing technology to effectively prevent sparks or high-temperature gases from leaking to the outside in the event of a fault or short circuit inside the equipment, thus avoiding an explosion. In the design of electrical equipment and lines, the intrinsically safe design concept is adopted, which effectively reduces the risk of fire and explosion caused by the equipment under normal and fault conditions by limiting current, voltage and energy. The multi-channel power supply box supports multiple output channels and can provide intrinsically safe power to multiple devices at the same time.

[0004] However, existing explosion-proof and intrinsically safe power supply boxes for mining have significant differences in environmental and equipment requirements across different mines, resulting in insufficient adaptability. For example, existing explosion-proof and intrinsically safe power supply boxes are insufficient to meet the power supply and control requirements of explosion-proof solenoid valves in underground coal mines. Summary of the Invention

[0005] In view of this, the present invention provides a widely applicable explosion-proof and intrinsically safe power supply box for mining applications.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A mine-use explosion-proof and intrinsically safe power supply box includes a first cable inlet, a transformer, a filter, a power module, and a second cable inlet.

[0008] The transformer is electrically connected to the first cable inlet and the filter respectively, and the filter is connected between the transformer and the power module;

[0009] The power module includes multiple intrinsically safe power supplies, which are connected in parallel, and the output terminals of the multiple intrinsically safe power supplies are respectively electrically connected to the second cable inlet terminal;

[0010] The power supply box also includes a solenoid valve power supply circuit for supplying power to an external solenoid valve and a signal feedback circuit for feeding back the opening and closing of the solenoid valve to an external controller and controlling the on / off state of the solenoid valve power supply circuit.

[0011] The first cable inlet is used to introduce external power to the power supply box and to enable the power supply box to supply power to the solenoid valve.

[0012] The second cable inlet is used to enable the power supply box to supply power to external devices.

[0013] In the aforementioned mine explosion-proof and intrinsically safe power supply box, optionally, the first cable entry end includes a first cable entry device and a first terminal block electrically connected to the first cable entry device. The input end of the transformer and the input end of the solenoid valve power supply circuit are electrically connected to an external power source through the first terminal block and the first cable entry device, respectively. The output end of the solenoid valve power supply circuit is electrically connected to the solenoid valve through the first terminal block and the first cable entry device.

[0014] In the aforementioned mine-use explosion-proof and intrinsically safe power supply box, optionally, the solenoid valve power supply circuit has multiple channels, and further, the solenoid valve power supply circuit has two channels.

[0015] In the aforementioned explosion-proof and intrinsically safe power supply box for mining, the second cable entry end may optionally include a second cable entry device and a second terminal electrically connected to the second cable entry device.

[0016] The power module also includes a switching power supply, which is connected in parallel with multiple intrinsically safe power supplies.

[0017] The signal feedback loop includes a first signal feedback loop connected to the output terminal of one of the intrinsically safe power supplies and a second signal feedback loop connected to the output terminal of the switching power supply.

[0018] In the aforementioned mine-use explosion-proof and intrinsically safe power supply box, optionally, the first signal feedback loop includes a first line connected to the output terminal of the intrinsically safe power supply and a second line connected between the output terminal of the intrinsically safe power supply and a second terminal. A first relay and a first contact are respectively provided on the first line. The first relay is also connected to the solenoid valve power supply circuit to control the on / off state of the solenoid valve power supply circuit. The two pins of the first contact are respectively connected to the second terminal.

[0019] In the aforementioned explosion-proof and intrinsically safe power supply box for mining applications, optionally, a second relay and a second contact are respectively provided on the second signal feedback circuit. The second relay is also connected to a second line to control the on / off state of the second line. The two pins of the second contact are respectively connected to the first terminal block, and the second contact is the normally open contact of the solenoid valve.

[0020] In the aforementioned mine-use explosion-proof and intrinsically safe power supply box, optionally, the number of the first signal feedback loops corresponds one-to-one with the number of solenoid valve power supply loops, each of the first signal feedback loops is provided with a first line and a second line, and the number of the second signal feedback loops corresponds one-to-one with the number of solenoid valve power supply loops.

[0021] In the aforementioned intrinsically safe and explosion-proof power supply box for mining applications, optionally, there are four intrinsically safe power supplies. Two of the four intrinsically safe power supplies have an output voltage of 18±0.5VDC, and the other two intrinsically safe power supplies have output voltages of 12±0.5VDC and 24±0.5VDC, respectively. The intrinsically safe power supply with an output voltage of 24±0.5VDC is connected to the first signal feedback loop.

[0022] In the aforementioned mine-use explosion-proof and intrinsically safe power supply box, optionally, the power supply box further includes an explosion-proof housing, the transformer, filter, and power module are respectively disposed inside the explosion-proof housing, and the first cable inlet and the second cable inlet are respectively disposed on opposite sides of the explosion-proof housing.

[0023] In the aforementioned mine-use explosion-proof and intrinsically safe power supply box, optionally, there are four intrinsically safe power supplies, and the four intrinsically safe power supplies can output three different output voltages.

[0024] In the aforementioned mine-use explosion-proof and intrinsically safe power supply box, optionally, the voltage of the external power supply is an AC voltage of 127±0.5VAC.

[0025] In the aforementioned explosion-proof and intrinsically safe power supply box for mining applications, optionally, the output current of the intrinsically safe power supply is 0.5~2.0A.

[0026] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0027] The intrinsically safe and explosion-proof power supply box for mining applications is equipped with multiple intrinsically safe power supplies, as well as solenoid valve power supply circuits and signal feedback circuits, making it more versatile and adaptable to on-site power supply needs. It can not only provide intrinsically safe power to components such as loudspeakers, interlocking switches, controllers, and speed sensors along the coal mine line, but also power explosion-proof solenoid valves, thus solving the power supply needs of overheated water spraying in coal mines. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0029] Figure 1 This is a schematic diagram of the structure of a mine explosion-proof and intrinsically safe power supply box according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Circuit diagram of a mine explosion-proof and intrinsically safe power supply box;

[0031] Figure 3 for Figure 1 Working principle diagram of the intrinsically safe power supply in a mine explosion-proof and intrinsically safe power supply box;

[0032] Figure label:

[0033] 1. Explosion-proof housing; 2. Transformer; 3. Filter; 4. Intrinsically safe power supply #1; 5. Intrinsically safe power supply #2; 6. Intrinsically safe power supply #3; 7. Intrinsically safe power supply #4; 8. Switching power supply; 9. 1KA relay; 10. 2KA relay; 11. 3KA relay; 12. 4KA relay; 13. First terminal block; 14. Second terminal block; 15. First cable entry device; 16. Second cable entry device; 17. First contact; 18. Second contact; 19. Solenoid valve control circuit; 20. First signal feedback circuit; 201. First line; 202. Second line; 21. Second signal feedback circuit. Detailed Implementation

[0034] Existing intrinsically safe and explosion-proof power supply boxes for mining have insufficient applicability. While they can provide multiple intrinsically safe power sources for the electrical control systems of belt conveyors in underground coal mines, they are not suitable for powering and controlling explosion-proof solenoid valves in coal mines. Typically, a separate solenoid valve control box is required, leading to higher costs. This application redesigns the structure of the intrinsically safe and explosion-proof power supply box for mining, incorporating multiple intrinsically safe power sources, as well as solenoid valve power supply circuits and signal feedback circuits. This broadens its applicability, enabling it to supply intrinsically safe power to components such as loudspeakers, interlocking switches, controllers, and speed sensors along the coal mine line, and also to provide non-intrinsically safe power to solenoid valves. This solves the power supply needs for overheated water spraying in coal mines, improves equipment stability and safety, and reduces costs.

[0035] To enable those skilled in the art to better understand the technical solutions in the embodiments of this utility model, the technical solutions in 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 embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art should fall within the protection scope of this utility model.

[0036] See Figure 1 The shown is a mine-use explosion-proof and intrinsically safe power supply box. Figure 2 As can be seen from the circuit diagram of the power supply box, the mine-use explosion-proof and intrinsically safe power supply box includes an explosion-proof housing 1, a first cable inlet, a transformer 2, a filter 3, a power module, and a second cable inlet. The first cable inlet is used to introduce external power into the power supply box, which can be AC ​​power of about 127V. The second cable inlet is used to enable the power supply box to supply power to external devices. The external devices are devices other than solenoid valves, such as loudspeakers, interlocking switches, controllers, speed sensors, and other components along the coal mine line. The second cable inlet provides intrinsically safe DC power to the external devices.

[0037] Then by Figure 1 As can be seen, the first cable entry end and the second cable entry end are respectively located on opposite sides of the explosion-proof housing 1. The first cable entry end includes a first cable entry device 15 located on the explosion-proof housing 1 and a first terminal block 13 located on the explosion-proof housing 1 and electrically connected to the first cable entry device 15. The transformer 2 is electrically connected to the first terminal block 13 and the filter 3 respectively. The filter 3 is connected between the transformer 2 and the power module.

[0038] The second cable entry end includes a second cable entry device 16 disposed on the explosion-proof housing 1 and a second terminal 14 disposed on the explosion-proof housing 1 and electrically connected to the second cable entry device 16. The second terminal 14 is an intrinsically safe terminal, and the first terminal 13 is a non-intrinsically safe terminal.

[0039] The power module includes multiple intrinsically safe power supplies and switching power supplies 8, which are connected in parallel. The multiple intrinsically safe power supplies are electrically connected to the second terminal 14 respectively.

[0040] Figure 2 The circuit diagram also shows that the mine-use explosion-proof and intrinsically safe power supply box includes a solenoid valve power supply circuit 19 for supplying power to an external solenoid valve, and a signal feedback circuit for feeding back feedback to an external intrinsically safe controller regarding the opening and closing of the solenoid valve and controlling the on / off state of the solenoid valve power supply circuit 19. The input terminal of the solenoid valve power supply circuit 19 is electrically connected to an external power source through a first terminal block 13 and a first cable entry device 15. The output terminal of the solenoid valve power supply circuit 19 is electrically connected to the solenoid valve through the first terminal block 13 and the first cable entry device 15 to supply 127V AC power to the solenoid valve. Both the first terminal block 13 and the first cable entry device 15 have multiple interfaces. The input and output terminals of the solenoid valve power supply circuit 19 are connected to different interfaces, indicating that the first cable entry terminal is also used to supply power to the solenoid valve.

[0041] The solenoid valve power supply circuit 19 can be configured with multiple circuits, such as two or more, depending on the actual conditions in the coal mine. In this example, see... Figure 2 As can be seen, the solenoid valve power supply circuit 19 is provided with two channels. The input terminals of the first channel and the second channel are both L1 and L2, which are electrically connected to the first terminal 13. The output terminals of the first channel are FL1 and FN1, which are electrically connected to the first terminal 13. The output terminals of the second channel are FL1 and FN2, which are electrically connected to the first terminal 13 and are used to supply power to the solenoid valve.

[0042] In this example, the first cable entry device is mainly used to connect to an external 127VAC power supply and to connect two solenoid valves to provide 127VAC output power to the solenoid valves.

[0043] The signal feedback loop includes a first signal feedback loop 20 connected to the output of one of the intrinsically safe power supplies and a second signal feedback loop 21 connected to the output of the switching power supply 8.

[0044] The first signal feedback loop 20 includes a first line 201 connected to the output terminal of an intrinsically safe power supply and a second line 202 connected between the output terminal of the intrinsically safe power supply and the second terminal 14. A first relay and a first contact 17 are respectively provided on the first line 201. The first relay is also connected to the solenoid valve power supply loop 19 to control the on / off state of the solenoid valve power supply loop 19. The two pins of the first contact 17 are respectively connected to the second terminal 14.

[0045] The second signal feedback loop 21 is equipped with a second relay and a second contact 18. The second relay is also connected to the second line 202 to control the on / off state of the second line 202. The two pins of the second contact 18 are connected to the first terminal 13. The second contact 18 is the normally open contact of the solenoid valve.

[0046] The number of first signal feedback loops 20 corresponds one-to-one with the number of solenoid valve power supply loops 19. Each first signal feedback loop 20 is provided with a first line 201 and a second line 202. The number of second signal feedback loops 21 corresponds one-to-one with the number of solenoid valve power supply loops 19.

[0047] In this example, such as Figure 2As shown, the first line 201 and the second line 202 each have two paths, and the second signal feedback loop 21 has two paths. In one of the two paths of the first line 201, the first relay is a 1KA relay 9. The 5th and 9th pins of the 1KA relay 1KA1 are connected to the solenoid valve control loop 19 of the first path to control the on / off state of the solenoid valve control loop 19. The two pins J1 and J2 of the first contact 17 are connected to the second terminal 14. In the other path, the first relay is a 2KA relay 10. The 5th and 9th pins of the 2KA relay 2KA1 are connected to the solenoid valve control loop 19 of the second path to control the on / off state of the solenoid valve control loop 19. The two pins J3 and J4 of the first contact 17 are connected to the second terminal 14.

[0048] The second relay of the second signal feedback loop 21 of the first path is a 3KA relay 11. The 5th and 9th pins of the 3KA relay 11 are connected to one of the two second lines 202 to control the on / off state of the second line 202. The two pins W1 and W2 of the second contact 18 are connected to the first terminal 13. The second relay of the second signal feedback loop 21 of the second path is a 4KA relay 12. The 5th and 9th pins of the 4KA relay 12 are connected to the other of the two second lines 202 to control the on / off state of the second line 202. The two pins W3 and W4 of the second contact 18 are connected to the first terminal 13.

[0049] The output terminals DI1 and DI2 of the second line 202 are connected to the second terminal 14 respectively, and are used to connect to the switch input of the controller to monitor whether the solenoid valve is open.

[0050] By designing the solenoid valve control circuit 19 and the signal feedback circuit, the power supply box outputs 127V power to meet the needs of overheating water spraying in coal mines. Furthermore, the power supply box supplies 127V AC power to the solenoid valve through the first cable introduction device. Compared with the traditional solution that requires a separate solenoid valve control box, this reduces the number of devices and significantly lowers the cost.

[0051] Then by Figure 2 As can be seen, the intrinsically safe power supplies in the explosion-proof and intrinsically safe power supply box for mining include intrinsically safe power supply 4, intrinsically safe power supply 5, intrinsically safe power supply 6, and intrinsically safe power supply 7. The output terminals of intrinsically safe power supply 4, intrinsically safe power supply 5, intrinsically safe power supply 6, and intrinsically safe power supply 7 are respectively connected to the second terminal block 14. The output terminal of intrinsically safe power supply 5 is also connected to the first signal feedback loop 20. The second terminal block 14 and the second cable entry device 16 each have different interfaces for connecting different wiring and different equipment.

[0052] In this example, intrinsically safe power supply 4 (#1) outputs a DC voltage of 12V and a current of 1.8A, intrinsically safe power supply 5 (#2) outputs a DC voltage of 24V and a current of 0.5A, intrinsically safe power supply 6 (#3) outputs a DC voltage of 18V and a current of 1A, and intrinsically safe power supply 7 (#4) outputs a DC voltage of 18V and a current of 1A. These power supplies can provide intrinsically safe power to components along the coal mine's underground pipeline, such as controllers, loudspeakers, interlocking switches, and speed sensors, and have a strong load-bearing capacity.

[0053] In this example, the second cable entry device is mainly used to connect the controller's four intrinsically safe power supplies as well as the control and monitoring signals of the solenoid valves.

[0054] Each intrinsically safe power supply uses an existing intrinsically safe power supply, and its working principle is as follows: Figure 3 As shown, after the AC voltage is input, the high-frequency interference of the power grid system and the interference of the power supply itself to the power grid are suppressed by the low-pass filter. After rectification, a high-frequency voltage is generated by the switching transistor. The high-frequency voltage is converted into DC voltage by the high-frequency transformer and rectifier. The DC voltage feedback signal is automatically regulated by the pulse width modulator. The current limiting protector plays the role of current limiting protection through the sampling resistor circuit.

[0055] When this explosion-proof and intrinsically safe power supply box is actually working in a coal mine, the first cable entry device of the power supply box is electrically connected to an external 127VAC power supply and an external solenoid valve, and the second cable entry device of the power supply box is connected to external controllers, interlocking switches, conversion sensors and other components.

[0056] When the controller detects that the drum temperature of the belt conveyor in the coal mine is too high, the control J1 and J2 are connected, the 1KA relay 9 is energized, the contact 1KA1 of the 1KA relay 9 is closed, the solenoid valve control circuit 19 is connected, the 1# solenoid valve is energized and opened, realizing water spraying for cooling; when the 1# solenoid valve is energized, W1 and W2 are connected, the 3KA relay is energized, the feedback signal DI1 is connected, and the signal of the solenoid valve opening is transmitted to the controller.

[0057] Another control circuit connects J3 and J4, energizing 2KA relay 10. This energizes 2KA relay 10's contact 2KA1, connecting the solenoid valve control circuit 20. Solenoid valve #2 is then energized and opens, achieving water spray cooling. When solenoid valve #2 is energized, W3 and W3 connect, energizing 4KA relay. Feedback signal DI2 is activated, transmitting the solenoid valve opening signal to the controller.

[0058] It should also be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" or "many" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0059] In addition, in the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can refer to mechanical connection or electrical connection, or the internal connection of two components. They can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0060] The above embodiments are only used to illustrate the present utility model, and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model. The patent protection scope of the present utility model should be defined by the claims.

Claims

1. A mine-use explosion-proof and intrinsically safe power supply box, characterized in that, The power supply box includes a first cable inlet, a transformer (2), a filter (3), a power module, and a second cable inlet; The transformer (2) is electrically connected to the first cable inlet and the filter (3) respectively, and the filter (3) is connected between the transformer (2) and the power module; The power module includes multiple intrinsically safe power supplies, which are connected in parallel, and the output terminals of the multiple intrinsically safe power supplies are respectively electrically connected to the second cable inlet terminal; The power supply box also includes a solenoid valve power supply circuit (19) for supplying power to an external solenoid valve and a signal feedback circuit for feeding back the opening and closing of the solenoid valve to an external controller and controlling the on / off state of the solenoid valve power supply circuit (19). The first cable inlet is used to introduce external power to the power supply box and to enable the power supply box to supply power to the solenoid valve. The second cable inlet is used to enable the power supply box to supply power to external devices.

2. The mine-use explosion-proof and intrinsically safe power supply box according to claim 1, characterized in that, The first cable entry end includes a first cable entry device (15) and a first terminal (13) electrically connected to the first cable entry device (15). The input end of the transformer (2) and the input end of the solenoid valve power supply circuit (19) are electrically connected to the external power supply through the first terminal (13) and the first cable entry device (15), respectively. The output end of the solenoid valve power supply circuit (19) is electrically connected to the solenoid valve through the first terminal (13) and the first cable entry device (15).

3. The mine-use explosion-proof and intrinsically safe power supply box according to claim 2, characterized in that, The solenoid valve power supply circuit (19) has multiple channels.

4. The mine-use explosion-proof and intrinsically safe power supply box according to claim 3, characterized in that, The solenoid valve power supply circuit (19) has two channels.

5. The mine-use explosion-proof and intrinsically safe power supply box according to claim 2, characterized in that, The second cable entry end includes a second cable entry device (16) and a second terminal (14) electrically connected to the second cable entry device (16). The power module also includes a switching power supply (8), which is connected in parallel with multiple intrinsically safe power supplies; The signal feedback loop includes a first signal feedback loop (20) connected to the output terminal of one of the intrinsically safe power supplies and a second signal feedback loop (21) connected to the output terminal of the switching power supply (8).

6. The mine-use explosion-proof and intrinsically safe power supply box according to claim 5, characterized in that, The first signal feedback loop (20) includes a first line (201) connected to the output terminal of the intrinsically safe power supply and a second line (202) connected between the output terminal of the intrinsically safe power supply and a second terminal (14). A first relay and a first contact (17) are respectively provided on the first line (201). The first relay is also connected to the solenoid valve power supply circuit (19) to control the on / off state of the solenoid valve power supply circuit (19). The two pins of the first contact (17) are respectively connected to the second terminal (14); and / or, A second relay and a second contact (18) are respectively provided on the second signal feedback loop (21). The second relay is also connected to the second line (202) to control the opening and closing of the second line (202). The two pins of the second contact (18) are respectively connected to the first terminal (13). The second contact (18) is the normally open contact of the solenoid valve.

7. The mine-use explosion-proof and intrinsically safe power supply box according to claim 6, characterized in that, The number of the first signal feedback loop (20) corresponds one-to-one with the number of the solenoid valve power supply loop (19). Each of the first signal feedback loops (20) is provided with a first line (201) and a second line (202). The number of the second signal feedback loops (21) corresponds one-to-one with the number of the solenoid valve power supply loops (19).

8. The mine-use explosion-proof and intrinsically safe power supply box according to claim 5, characterized in that, The intrinsically safe power supply has four units. Two of the four intrinsically safe power supplies have an output voltage of 18±0.5VDC, and the other two intrinsically safe power supplies have output voltages of 12±0.5VDC and 24±0.5VDC, respectively. The intrinsically safe power supply with an output voltage of 24±0.5VDC is connected to the first signal feedback loop (20).

9. The mine-use explosion-proof and intrinsically safe power supply box according to claim 1, characterized in that, The power supply box also includes an explosion-proof housing (1), the transformer (2), the filter (3) and the power module are respectively disposed inside the explosion-proof housing (1), and the first cable inlet and the second cable inlet are respectively disposed on opposite sides of the explosion-proof housing (1).

10. The mine-use explosion-proof and intrinsically safe power supply box according to claim 1, characterized in that, The intrinsically safe power supply has four units, and these four intrinsically safe power supplies can output three different output voltages; and / or, The external power supply has an AC voltage of 127±0.5VAC; and / or, The intrinsically safe power supply has an output current of 0.5~2.0A.

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