Intrinsic safety pilot module with water level control

Abstract

The utility model provides an intrinsic safety pilot module with a water level control function, and belongs to the field of associated circuit devices of explosion-proof electrical equipment. The problem that an existing intrinsically-safe pilot module lacks a water level control starting function and cannot be used in cooperation with a starter is solved. Comprising an intrinsic safety input terminal, a mode selection loop, a closing control loop, an opening control loop, an intrinsic safety output terminal and a related voltage transformation and stabilization circuit, the intrinsic safety input terminal comprises a water level control input terminal, a near control input terminal and a remote control input terminal, and the water level control input terminal is connected with a water level sensor used for detecting underground water level signals; the mode selection loop is used for selecting the water level control module or a near control mode and a remote control mode through two switches; the intrinsic safety input terminal introduces start-stop signals in a water level mode / a near control mode / a remote control mode and transmits the signals to the closing control loop or the opening control loop through the mode selection loop. The utility model is applied to the underground starter.

Description

Technical Field

[0001] The utility model provides an intrinsically safe pilot module with water level control, belonging to the technical field of intrinsically safe circuit associated devices for explosion-proof electrical equipment. Background Technique

[0002] With the continuous improvement of the mechanization and automation levels of coal mine production, electrical equipment is widely used, the underground power supply capacity is constantly increasing, and higher requirements are put forward for the reliability and safety of the underground power supply system.

[0003] As the most common motor starting equipment underground, the starter is widely used. At present, for underground equipment, there are three starting methods, including direct starting and stopping realized by underground three-way remote control buttons and near-control buttons, and indirect control starting and stopping realized through water level monitoring. Whether it is manual operation or automatic control, all three starting methods are exposed in the gas mine and need to be controlled by an intrinsically safe pilot module. However, the current intrinsically safe pilot module generally only has near-control and remote-control starting modes and cannot start the starter through water level control, making the module unable to be fully compatible with the current starting methods of the starter. Content of the Utility Model

[0004] In order to solve the problem that the existing intrinsically safe pilot module lacks the function of starting with water level control and thus cannot be used in cooperation with the starter, the utility model proposes an intrinsically safe pilot module with water level control, aiming to realize an intrinsically safe pilot module with water level control function through hardware improvement or improvement of the combined connection of hardware modules and / or circuits.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: an intrinsically safe pilot module with water level control, including intrinsically safe input terminals, a mode selection circuit, a closing control circuit, a tripping control circuit, intrinsically safe output terminals and related voltage transformation and voltage stabilization circuits. The intrinsically safe input terminals include water level control input terminals, near-control input terminals and remote-control input terminals. The water level control input terminals are connected to a water level sensor for detecting underground water level signals. The near-control input terminals are connected to near-control buttons. The remote-control input terminals are connected to remote-control buttons;

[0006] The mode selection circuit is connected to the intrinsically safe input terminals and is used to select the water level control module or the near-control mode and the remote-control mode, which is realized through two switches;

[0007] The intrinsically safe input terminals introduce start-stop signals in the water level mode / near-control mode / remote-control mode and transmit the signals to the closing control circuit or the tripping control circuit through the mode selection circuit;

[0008] The closing control circuit and the opening control circuit are connected to the mode selection circuit, and are respectively used to realize closing and opening control in the water level mode / near control mode / remote control mode;

[0009] One end of the intrinsically safe output terminal is connected to the control circuit of the starter, and the other end is connected to the closing control circuit, the opening control circuit, and the voltage transformation and voltage stabilization circuit, and is used to output voltage signals, opening signals, and closing signals to the starter;

[0010] The voltage transformation and voltage stabilization circuit is connected between the intrinsically safe input terminal, the mode selection circuit, the closing control circuit, the opening control circuit, and the intrinsically safe output terminal, and is used to provide stable voltage for the intrinsically safe input terminal, the mode selection circuit, the closing control circuit, the opening control circuit, and the intrinsically safe output terminal.

[0011] The water level control input terminal includes three terminals: high water level GSW, low water level DSW, and water level common terminal SCOM. The near control input terminal includes three terminals: near control closing JH, near control opening JF, and near control common terminal JCOM. The remote control input terminal includes three terminals: remote control closing YH, remote control opening YF, and remote control common terminal YCOM.

[0012] The mode selection circuit includes two switches S1 and S2. The near control mode, the remote control mode, or the water level control mode can be selected through the switch S2.

[0013] Both the switches S1 and S2 are double-pole double-throw switches. One common terminal of the switch S1 is connected in parallel with the water level common terminal SCOM. One common terminal of the switch S1 is also connected in parallel with the second common terminal, and then connected in series with the diode D11 and then respectively connected to the near control common terminal JCOM and the remote control common terminal YCOM. The two terminals of the selection terminal 1 of the switch S1 are connected in parallel and then connected to the selection terminal 1 of the switch S2, and the two terminals of the selection terminal 1 of the switch S1 are also respectively connected to the near control closing JH and the remote control closing YH terminals. The two terminals of the selection terminal 2 of the switch S1 are connected in parallel and then connected to the selection terminal 2 of the switch S2, and the two terminals of the selection terminal 2 of the switch S1 are also respectively connected to the near control opening JF and the remote control opening YF terminals. The selection terminal 1 of the switch S2 is connected to the high water level GSW terminal, and the selection terminal 2 of the switch S2 is connected to the low water level DSW terminal. The first common terminal and the second common terminal of the switch S2 are respectively connected to the voltage transformation and voltage stabilization circuit.

[0014] The closing control circuit and the opening control circuit respectively include an optocoupler, a zener diode, a triode, a relay, a resistor, and a diode. The optocoupler transfers the closing and opening electrical signals to the triode through light, and the triode drives the relay to act, and outputs the closing and opening drive action points.

[0015] The intrinsically safe output terminals include a total of nine wiring terminals, namely power supplies 100V, 36V, 0V, closing common terminal HGND, closing normally open auxiliary point HNO, closing normally closed auxiliary point HNC, tripping common terminal FGND, tripping normally open auxiliary point FNO, and tripping normally closed auxiliary point FNC. The closing and tripping signals are output to the starter control circuit through the intrinsically safe output terminals to perform motor start and stop control operations.

[0016] The voltage transformation and regulation circuit includes a transformer T1. One end of the transformer T1 is respectively connected to the 100V, 36V, and 0V wiring terminals of the intrinsically safe output terminals. The other end of the transformer T1 provides two 17V voltages, one of which provides the coil voltage for the closing and tripping relay, and the other provides the excitation voltage for converting the intrinsically safe signal into a non-intrinsically safe signal.

[0017] The intrinsically safe input terminals and intrinsically safe output terminals are led out from the module through wiring terminals, and the remaining electrical components are all soldered on the circuit board and encapsulated.

[0018] The beneficial effects of the present utility model compared with the prior art are as follows:

[0019] 1. Compared with the traditional starting method, the present utility model meets the requirements of intrinsically safe circuits and reduces the risk of electric sparks igniting flammable gases.

[0020] 2. Compared with the traditional starting method, the present utility model combines three common starting methods. Users can select and use them according to different needs. The three methods do not interfere with each other and are all controlled through a unified output node, which is convenient for workers to wire.

[0021] 3. Compared with the traditional starting method, the present utility model realizes the electrical isolation between intrinsically safe and non-intrinsically safe through an optocoupler, isolates electrical energy while realizing signal transmission, and has good electrical insulation ability and anti-interference ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present utility model will be further described below with reference to the drawings:

[0023] Figure 1 is the electrical schematic diagram of the present utility model;

[0024] In the figure: 1 is the intrinsically safe input terminal, 2 is the mode selection circuit, 3 is the closing control circuit, 4 is the tripping control circuit, 5 is the intrinsically safe output terminal, and 6 is the voltage transformation and regulation circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] As Figure 1As shown in the figure, the utility model provides an intrinsically safe pilot module with water level control, which includes an intrinsically safe input terminal 1, a mode selection circuit 2, a closing control circuit 3, a tripping control circuit 4, an intrinsically safe output terminal 5 and a related step-down and voltage-stabilizing circuit 6. The intrinsically safe input terminal 1 includes a total of nine wiring terminals, namely high water level GSW, low water level DSW, water level common terminal SCOM, local closing JH, local tripping JF, local common terminal JCOM, remote closing YH, remote tripping YF, and remote common terminal YCOM. The start-stop signals in the water level mode / local control mode / remote control mode are introduced through the intrinsically safe input terminal 1, and the signals are transmitted to the closing control circuit 3 or the tripping control circuit 4 through the mode selection circuit 2.

[0026] The mode selection circuit 2 includes two switches S1 and S2. The user can select the local / remote control mode or the water level control mode through the switch S2. Both switches S1 and S2 are double-pole double-throw switches. One common terminal of switch S1 is connected in parallel with the water level common terminal SCOM. One common terminal of switch S1 is also connected in parallel with the second common terminal and then connected in series with a diode D11 and then respectively connected to the local common terminal JCOM and the remote common terminal YCOM. The two terminals of the first selection terminal of switch S1 are connected in parallel and then connected to the first selection terminal (remote / local control terminal) of switch S2, and the two terminals of the first selection terminal of switch S1 are also respectively connected to the local closing JH and remote closing YH terminals. The two terminals of the second selection terminal of switch S1 are connected in parallel and then connected to the second selection terminal (remote / local control) of switch S2, and the two terminals of the second selection terminal of switch S1 are also respectively connected to the local tripping JF and remote tripping YF terminals. The first selection terminal (water level control) of switch S2 is connected to the high water level GSW terminal, and the second selection terminal (water level control) of switch S2 is connected to the low water level DSW terminal. The first common terminal and the second common terminal of switch S2 are respectively connected to the step-down and voltage-stabilizing circuit 6.

[0027] The principle of the mode selection circuit 2 is as follows: When it is switched to the "water level control mode", the pilot control method is automatic water level control. The water level signal is provided by three external probes. Taking the water level reference point as the reference, the low water level point and the high water level point are set respectively. When the water level is below the high water level, a tripping signal is output. When the water level rises from the reference point until it exceeds the high water level point, a closing signal is output. When the water level drops from the high water level until it is below the low water level, a tripping signal is output. In the water level control mode, switch S1 does not work. When switch S1 is switched to "local control", the pilot control method is local control, that is, local control. At this time, the pilot output can be controlled by the closing and tripping buttons. When switch S1 is switched to "remote control", the pilot control method is remote control, that is, remote control. At this time, the pilot output can be controlled by the remote closing and tripping buttons.

[0028] The closing control circuit 3 and the opening control circuit 4 respectively include optocouplers (U2, U5), zener diodes (ZD11, ZD13, ZD12, ZD14), triodes (Q2, Q1), relays (J2, J1), etc. The optocouplers transmit the closing and opening electrical signals to the triodes through light as a medium, and the triodes drive the relays to act, outputting the closing and opening drive action points.

[0029] The intrinsically safe output terminal 5 includes a total of nine wiring terminals, namely power supply 100V, 36V, 0V, closing common terminal HGND, closing normally open auxiliary point HNO, closing normally closed auxiliary point HNC, opening common terminal FGND, opening normally open auxiliary point FNO, and opening normally closed auxiliary point FNC. The closing and opening signals are output to the starter control circuit through the intrinsically safe output terminal 5 for motor start and stop control operations.

[0030] The voltage transformation and regulation circuit 6 consists of components such as a transformer T1, diodes (D1, D2, etc.), zener diodes (ZD1~ZD4), and resistors (R1, R2, etc.), realizing the operations of power supply voltage transformation, rectification, and regulation, and providing a stable voltage guarantee for the normal operation of the intrinsically safe module.

[0031] One end of the transformer T1 is respectively connected to the 100V, 36V, and 0V wiring terminals of the intrinsically safe output terminal 5. The other end of the transformer T1 provides two 17V voltages. One is used to provide the coil voltage for the closing and opening relays, and the other is used to provide the excitation voltage for converting the intrinsically safe signal into a non-intrinsically safe signal. The 17V power supply that provides the coil voltage for the closing and opening relays connects the output voltage to the input terminal of the power supply chip U1 through a rectifier bridge composed of diodes D6 - D9. The 12V voltage output by the power supply chip U1 supplies power to the relay coils of the closing control circuit 3 and the opening control circuit 4. The closing control circuit 3 connects the closing common terminal HGND, closing normally open auxiliary point HNO, and closing normally closed auxiliary point HNC of the relay J2 to the intrinsically safe output terminal, and the opening control circuit 4 connects the opening common terminal FGND, opening normally open auxiliary point FNO, and opening normally closed auxiliary point FNC of the relay J1 to the intrinsically safe output terminal;

[0032] The positive pole of the 17V power supply that provides the excitation voltage for converting the intrinsically safe signal into a non-intrinsically safe signal is connected in series with resistor R2, and then the positive poles of voltage stabilizing diodes ZD1 and ZD3 are connected in parallel. After that, it is connected in series with fuse FU3 and then divided into two paths. One path is connected in series with resistors R4, R1, and R11 and then connected to the common terminal 1 of switch S2, and the other path is connected in series with resistors R5, R13, and R12 and then connected to the common terminal 2 of switch S2. At the same time, the negative pole of voltage stabilizing diode ZD11 of the closing control circuit 3, the negative pole of voltage stabilizing diode ZD12 of the closing control circuit 4, and the other input terminal of optocoupler U5 are also connected in parallel after fuse FU3. The positive pole of voltage stabilizing diode ZD11 of the closing control circuit 3 is connected in parallel to the end where resistor R4 is connected to R1 and an input terminal of optocoupler U2. The other input terminal of optocoupler U2 is connected to the positive poles of voltage stabilizing diodes ZD1 and ZD3. The positive pole of voltage stabilizing diode ZD12 of the opening control circuit 4 is connected in parallel to the end where resistor R5 is connected to R13 and an input terminal of optocoupler U5.

[0033] The negative pole of the 17V power supply that provides the excitation voltage for converting the intrinsically safe signal into a non-intrinsically safe signal is connected in series with resistor R10, and then the positive poles of voltage stabilizing diodes ZD2 and ZD4 are connected in parallel and then connected in parallel with the water level common terminal SCOM and the common terminal 1 of switch S1.

[0034] Among them, the intrinsically safe input terminal 1 and the intrinsically safe output terminal 5 are led out from the module through green terminal blocks, and the remaining electrical components are all soldered on the circuit board and encapsulated.

[0035] The electrical isolation and signal transmission between the intrinsically safe and non-intrinsically safe in the intrinsically safe pilot module provided by the present utility model are realized through optocouplers (U2, U5): when the closing and opening electrical signals are applied to both ends of the light-emitting diode of the optocoupler, the light-emitting diode emits light. After the light receiver receives the light, a photocurrent is generated and flows out from the output terminal, thus realizing the "electricity - light - electricity" conversion.

[0036] According to the requirements of intrinsically safe circuits stipulated by the state, the present utility model designs an intrinsically safe pilot module with water level control, which meets the requirements of intrinsically safe design, restricts and isolates the starting energy, and can effectively prevent the ignition hazard caused by discharge sparks or thermal effects in explosive hazardous areas. At the same time, this module integrates three starting methods, and users can select and use them according to different needs. The three methods do not interfere with each other and are all controlled through a unified output node, which is convenient for workers to wire.

[0037] The present utility model mainly has the following advantages:

[0038] (1) It can transmit the start-stop intrinsically safe signal to the control system, and uses an optocoupler isolator to realize the "electricity - light - electricity" conversion, achieving effective isolation between the intrinsically safe and non-intrinsically safe signals;

[0039] (2) It integrates three common starting methods, and users can choose to use them according to different needs. The three methods do not interfere with each other and are all controlled through a unified output node, which is convenient for workers to wire.

[0040] (3) It effectively uses power electronic devices such as diodes, voltage stabilizing tubes, and triodes for power supply processing, laying a foundation for the stable operation of the intrinsically safe module.

[0041] Regarding the specific structure of the present utility model, it should be noted that the connection relationships between the various component modules adopted by the present utility model are determined and achievable. Except for the special descriptions in the embodiments, the specific connection relationships can bring corresponding technical effects, and on the premise of not relying on the execution of corresponding software programs, the technical problems proposed by the present utility model can be solved. The models of the components, modules, and specific components, the connection methods between each other, and the conventional usage methods and predictable technical effects brought by the above technical features, except for the specific descriptions, all belong to the publicly disclosed contents in patents, journal papers, technical manuals, technical dictionaries, and textbooks that those skilled in the art can obtain before the filing date, or belong to the prior art such as conventional techniques and common general knowledge in the art, and need not be elaborated. This makes the technical solution provided in this case clear, complete, and achievable, and the corresponding physical product can be reproduced or obtained according to this technical means.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An intrinsically safe pilot module with water level control, characterized in that: It includes an intrinsically safe input terminal, a mode selection circuit, a closing control circuit, an opening control circuit, an intrinsically safe output terminal and a voltage transformation and stabilization circuit. The intrinsically safe input terminal includes a water level control input terminal, a local control input terminal and a remote control input terminal. The water level control input terminal is connected to a water level sensor for detecting an underground water level signal. The local control input terminal is connected to a local control button. The remote control input terminal is connected to a remote control button. The mode selection circuit is connected to the intrinsically safe input terminal and is used to select the water level control module or the local control mode or the remote control mode, which is realized by two switches; The intrinsically safe input terminal introduces the start and stop signals in the water level mode / near control mode / remote control mode, and transmits the signals to the closing control circuit or the opening control circuit through the mode selection circuit; The closing control circuit and the opening control circuit are connected to the mode selection circuit, and are used to realize closing and opening control in water level mode / local control mode / remote control mode respectively; One end of the intrinsically safe output terminal is connected to the control circuit of the starter, and the other end is connected to the closing control circuit, the opening control circuit, and the voltage transformation and stabilization circuit, and is used to output the voltage signal, the opening signal, and the closing signal to the starter; The voltage transformer and voltage stabilizing circuit is connected between the intrinsically safe input terminal, the mode selection circuit, the closing control circuit, the opening control circuit, and the intrinsically safe output terminal, and is used to provide a stable voltage to the intrinsically safe input terminal, the mode selection circuit, the closing control circuit, the opening control circuit, and the intrinsically safe output terminal.

2. The intrinsically safe pilot module with water level control according to claim 1, characterized in that: The water level control input terminals include three terminals: high water level GSW, low water level DSW, and water level common terminal SCOM; the local control input terminals include three terminals: local control closing JH, local control opening JF, and local control common terminal JCOM; the remote control input terminals include three terminals: remote control closing YH, remote control opening YF, and remote control common terminal YCOM.

3. An intrinsically safe pilot module with water level control according to claim 2, characterized in that: The mode selection circuit includes two switches S1 and S2, and the switch S2 can be used to select the local control mode, the remote control mode or the water level control mode.

4. The intrinsically safe pilot module with water level control according to claim 3, characterized in that: The switches S1 and S2 both adopt double-pole double-throw switches, the common terminal 1 of the switch S1 is connected in parallel with the water level common terminal SCOM, the common terminal 1 of the switch S1 is also connected in parallel with the common terminal 2 and then connected in series with a diode D11 and then respectively connected to the local control common terminal JCOM and the remote control common terminal YCOM, the two terminals of the selection terminal 1 of the switch S1 are connected in parallel with the selection terminal 1 of the switch S2, and the two terminals of the selection terminal 1 of the switch S1 are also respectively connected to the local control closing terminal JH and the remote control closing terminal YH, the two terminals of the selection terminal 2 of the switch S1 are connected in parallel with the selection terminal 2 of the switch S2, and the two terminals of the selection terminal 2 of the switch S1 are also respectively connected to the local control opening terminal JF and the remote control opening terminal YF; the selection terminal 1 of the switch S2 is connected to the high water level GSW terminal, and the selection terminal 2 of the switch S2 is connected to the low water level DSW terminal; the common terminal 1 and the common terminal 2 of the switch S2 are respectively connected to the voltage transformer and voltage stabilizing circuit.

5. An intrinsically safe pilot module with water level control according to any one of claims 1 to 4, characterized in that: The closing control circuit and the opening control circuit respectively include a photoelectric coupler, a voltage regulator, a transistor, a relay, a resistor and a diode. The photoelectric coupler uses light as a medium to transmit the closing and opening electrical signals to the transistor, and the transistor drives the relay to operate and output the closing and opening drive action points.

6. The intrinsically safe pilot module with water level control according to claim 5, characterized in that: The intrinsically safe output terminal includes a total of nine wiring terminals, namely power supply 100V, 36V, 0V, closing common terminal HGND, closing normally open auxiliary point HNO, closing normally closed auxiliary point HNC, opening common terminal FGND, opening normally open auxiliary point FNO, opening normally closed auxiliary point FNC. The closing and opening signals are output to the starter control circuit through the intrinsically safe output terminals to perform motor start and stop control operations.

7. An intrinsically safe pilot module with water level control according to claim 6, characterized in that: The voltage transformer and voltage stabilizing circuit includes a transformer T1, one end of which is connected to the 100V, 36V, and 0V terminals of the intrinsically safe output terminal respectively, and the other end of the transformer T1 provides two 17V voltages, one of which provides the coil voltage for the closing and opening relays, and the other provides the excitation voltage for converting the intrinsically safe signal into a non-intrinsically safe signal.

8. An intrinsically safe pilot module with water level control according to any one of claims 1 to 4, characterized in that: The intrinsically safe input terminal and the intrinsically safe output terminal are led out from the module through the wiring terminal, and the remaining electrical components are welded on the circuit board and packaged.

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