Safety protection device for ground gas drainage station pump in gas power generation industry

Abstract

The utility model discloses a safety protection device for a ground gas drainage station pump in the gas power generation industry, which comprises a drainage pump, a blow-off valve arranged on the drainage pump, a current sampling unit in signal connection with a generator duty room and a drainage station duty room, and a blow-off valve control unit, the current sampling unit is respectively and electrically connected with the drainage pump and the relief valve control unit, the current sampling unit comprises field effect MOS (Metal Oxide Semiconductor) transistors M2, M3, M4, M5, M6 and M7, the working current of the drainage pump can be acquired in real time, early warning can be timely given out when the current abnormally rises, and the opening degree of an emergency relief valve is controlled through the relief valve control unit and a PID (Proportion Integration Differentiation) algorithm, so that the safety of the drainage pump is ensured. The pressure of the outlet of the drainage pump is relieved in time, and then the working current of the drainage pump is gradually reduced to reach a normal working current state, so that the underground gas dangerous event caused by shutdown of the drainage pump is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mining, in particular to a pump safety protection device for a ground gas extraction station in the gas power generation industry. Background Art

[0002] In the coal mining industry, in order to reduce the threat of gas in the mine to the safe production of mine work, there is usually a gas extraction station on the ground. There are multiple gas extraction pumps in the station to extract the gas in the coal seam in the mine in real time, and the gas in the coal seam is extracted and discharged or utilized on the ground, which plays a role in protecting the environment and improving the overall economic benefits. At this time, whether the pump used in the ground extraction station is running safely and stably has become a crucial factor. The quality of the extraction pump itself has been very mature in the domestic technical accumulation for many years, and it is rare for the pump to stop working due to the pump itself.

[0003] In actual production operations, if the extracted gas is treated by direct release, the gas extraction pump can ensure continuous operation under very good working conditions, and there is no need to consider whether the extracted gas can be absorbed by the back end.

[0004] However, in the gas power generation industry, the gas extracted by the gas extraction pump is provided to the generator set for power generation. If the generator set is operating stably, there will not be too many problems. But the actual situation is that the generator set will reduce the power generation capacity and gas consumption due to fluctuations in gas quality and other external factors.

[0005] In this case, the outlet pressure of the drainage pump will increase because the back end cannot absorb it in time, and the working current of the drainage pump will increase synchronously, which can easily cause the line of the drainage pump to overheat and burn out and shut down. Therefore, we need to propose a pump safety protection device for the ground gas drainage station in the gas power generation industry to ensure that the drainage pump reaches the normal working current state and does not cause dangerous gas incidents in the mine due to the shutdown of the drainage pump. Utility Model Content

[0006] The purpose of the utility model is to provide a pump safety protection device for a ground gas extraction station in the gas power generation industry, which can collect the working current of the extraction pump in real time, issue an early warning in time for abnormal current increase, and control the opening and closing degree of the emergency relief valve through the relief valve control unit and the PID algorithm to timely relieve the outlet pressure of the extraction pump. Subsequently, the working current of the extraction pump will gradually decrease to reach a normal working current state, so as to ensure that no dangerous gas incidents will occur in the mine due to the shutdown of the extraction pump, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pump safety protection device for a ground gas extraction station in the gas power generation industry, comprising a extraction pump, a relief valve installed on the extraction pump, a current sampling unit connected to the generator duty room and the extraction station duty room signal, and a relief valve control unit, the current sampling unit is electrically connected to the extraction pump and the relief valve control unit respectively, the current sampling unit comprises field effect MOS tubes M2, M3, M4, M5, M6 and M7, the source electrodes of the three field effect MOS tubes M2, M3 and M4 are connected, the source electrodes of the field effect MOS tube M4 are connected The drain is connected to the source of the field effect MOS tube M5, the drain of the field effect MOS tube M2 is connected to the source of the field effect MOS tube M6, the drain of the field effect MOS tube M3 is connected to the source of the field effect MOS tube M7, a capacitor C49 is connected between the source of the field effect MOS tube M4 and the drain of the field effect MOS tube M5, a capacitor C50 is connected between the source of the field effect MOS tube M2 and the drain of the field effect MOS tube M6, and a capacitor C51 is connected between the source of the field effect MOS tube M3 and the drain of the field effect MOS tube M7.

[0008] Preferably, a resistor R54 and a capacitor C45 connected in parallel are connected between the gate and drain of the field effect MOS tube M4, a UH signal receiving terminal is provided on the gate of the field effect MOS tube M4, and a resistor R51 is connected to the gate of the field effect MOS tube M4.

[0009] Preferably, a resistor R55 and a capacitor C46 connected in parallel are connected between the gate and drain of the field effect MOS tube M2, a VH signal receiving terminal is provided on the gate of the field effect MOS tube M2, and a resistor R52 is connected to the gate of the field effect MOS tube M2.

[0010] Preferably, a resistor R56 and a capacitor C44 connected in parallel are connected between the gate and drain of the field effect MOS tube M3, a WH signal receiving terminal is provided on the gate of the field effect MOS tube M3, and a resistor R53 is connected to the gate of the field effect MOS tube M3.

[0011] Preferably, a resistor R67 and a capacitor C54 connected in parallel are connected between the gate and drain of the field effect MOS tube M5, a UL signal receiving terminal is arranged on the gate of the field effect MOS tube M5, and a resistor R64 is connected to the gate of the field effect MOS tube M5.

[0012] Preferably, a resistor R68 and a capacitor C55 connected in parallel are connected between the gate and drain of the field effect MOS tube M6, a VL signal receiving terminal is provided on the gate of the field effect MOS tube M6, and a resistor R65 is connected to the gate of the field effect MOS tube M6.

[0013] Preferably, a resistor R69 and a capacitor C56 are connected in parallel between the gate and drain of the field effect MOS tube M7, a WL signal receiving terminal is provided on the gate of the field effect MOS tube M7, and a resistor R66 is connected to the gate of the field effect MOS tube M7.

[0014] Preferably, a resistor R73 is connected to the drain of the field effect MOS tube M5, a resistor R74 is connected to the drain of the field effect MOS tube M6, a resistor R75 is connected to the drain of the field effect MOS tube M7, and a resistor R78 is connected to the connection terminals of the resistors R73, R74 and R75.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model can collect the working current of the drainage pump in real time, issue an early warning in time for abnormal increase of current, and control the opening and closing degree of the emergency relief valve through the relief valve control unit and the PID algorithm to relieve the outlet pressure of the drainage pump in time. Subsequently, the working current of the drainage pump will gradually decrease to reach a normal working current state, so as to ensure that no dangerous gas incidents in the mine will occur due to shutdown of the drainage pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural block diagram of the utility model;

[0019] Figure 3 This is a circuit diagram of the current sampling unit of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3The utility model provides a technical solution: a pump safety protection device for a ground gas extraction station in the gas power generation industry, comprising a extraction pump, a relief valve installed on the extraction pump, a current sampling unit connected to the generator duty room and the extraction station duty room, and a relief valve control unit, wherein the current sampling unit is electrically connected to the extraction pump and the relief valve control unit respectively, and the current sampling unit comprises field effect MOS tubes M2, M3, M4, M5, M6 and M7, the source electrodes of the three field effect MOS tubes M2, M3 and M4 are connected, and the drain electrode of the field effect MOS tube M4 is connected to the field The source of the field effect MOS tube M5 is connected, the drain of the field effect MOS tube M2 is connected to the source of the field effect MOS tube M6, the drain of the field effect MOS tube M3 is connected to the source of the field effect MOS tube M7, a capacitor C49 is connected between the source of the field effect MOS tube M4 and the drain of the field effect MOS tube M5, a capacitor C50 is connected between the source of the field effect MOS tube M2 and the drain of the field effect MOS tube M6, and a capacitor C51 is connected between the source of the field effect MOS tube M3 and the drain of the field effect MOS tube M7.

[0022] Optionally, an operational amplifier circuit may be added, which includes an operational amplifier U12B, wherein the 5th and 6th pins of the operational amplifier U12B are respectively connected to resistors R93 and R96, wherein the resistors R93 and R96 are respectively connected to the two ends of the resistor R73, a resistor R89 ​​is connected between the 6th and 7th pins of the operational amplifier U12B, a resistor R103 is further connected to the 5th pin of the operational amplifier U12B, and a resistor R97 is connected to the 7th pin of the operational amplifier U12B.

[0023] A resistor R54 and a capacitor C45 connected in parallel are connected between the gate and drain of the field effect MOS tube M4 , a UH signal receiving terminal is arranged on the gate of the field effect MOS tube M4 , and a resistor R51 is connected to the gate of the field effect MOS tube M4 .

[0024] A resistor R55 and a capacitor C46 connected in parallel are connected between the gate and drain of the field effect MOS tube M2, a VH signal receiving terminal is arranged on the gate of the field effect MOS tube M2, and a resistor R52 is connected to the gate of the field effect MOS tube M2.

[0025] A resistor R56 and a capacitor C44 connected in parallel are connected between the gate and drain of the field effect MOS tube M3, a WH signal receiving terminal is arranged on the gate of the field effect MOS tube M3, and a resistor R53 is connected to the gate of the field effect MOS tube M3.

[0026] A resistor R67 and a capacitor C54 connected in parallel are connected between the gate and drain of the field effect MOS tube M5 , a UL signal receiving terminal is arranged on the gate of the field effect MOS tube M5 , and a resistor R64 is connected to the gate of the field effect MOS tube M5 .

[0027] A resistor R68 and a capacitor C55 connected in parallel are connected between the gate and drain of the field effect MOS tube M6. A VL signal receiving terminal is provided on the gate of the field effect MOS tube M6. The gate of the field effect MOS tube M6 is connected to a resistor R65.

[0028] A resistor R69 and a capacitor C56 are connected in parallel between the gate and drain of the field effect MOS tube M7. A WL signal receiving terminal is provided on the gate of the field effect MOS tube M7. A resistor R66 is connected to the gate of the field effect MOS tube M7.

[0029] The drain of the field effect MOS tube M5 is connected to a resistor R73, the drain of the field effect MOS tube M6 is connected to a resistor R74, the drain of the field effect MOS tube M7 is connected to a resistor R75, and the connection terminals of the resistors R73, R74 and R75 are connected to a resistor R78.

[0030] A current sampling unit is used to collect the working current of the pumping pump in real time. If the current of the pumping pump is found to have an increasing trend, two signal warnings will be issued first. One signal will be given to the generator duty room to inform the generator duty personnel to deal with it in time, and the other signal will be given to the duty room personnel of the ground pumping station to inform them that they need to pay special attention to the operating status of the pump.

[0031] And when manual intervention is not possible in time, the device uses the PID algorithm to calculate the release amount to control the opening of the emergency release valve, and promptly relieve the outlet pressure of the drainage pump. As a result, the working current of the drainage pump will gradually decrease and reach the normal working current state to ensure that there will be no gas hazards in the mine due to the shutdown of the drainage pump.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pump safety protection device for a ground gas extraction station in the gas power generation industry, characterized in that: It includes a pumping pump, a relief valve installed on the pumping pump, a current sampling unit connected to the generator duty room and the pumping station duty room signal, and a relief valve control unit, the current sampling unit is electrically connected to the pumping pump and the relief valve control unit respectively, the current sampling unit includes field effect MOS tubes M2, M3, M4, M5, M6 and M7, the source electrodes of the three field effect MOS tubes M2, M3 and M4 are connected, the drain electrode of the field effect MOS tube M4 is connected to the source electrode of the field effect MOS tube M5, the The drain of the field effect MOS tube M2 is connected to the source of the field effect MOS tube M6, the drain of the field effect MOS tube M3 is connected to the source of the field effect MOS tube M7, a capacitor C49 is connected between the source of the field effect MOS tube M4 and the drain of the field effect MOS tube M5, a capacitor C50 is connected between the source of the field effect MOS tube M2 and the drain of the field effect MOS tube M6, and a capacitor C51 is connected between the source of the field effect MOS tube M3 and the drain of the field effect MOS tube M7.

2. A pump safety protection device for a ground gas extraction station in the gas power generation industry according to claim 1, characterized in that: A resistor R54 and a capacitor C45 connected in parallel are connected between the gate and drain of the field effect MOS tube M4 , a UH signal receiving terminal is arranged on the gate of the field effect MOS tube M4 , and a resistor R51 is connected to the gate of the field effect MOS tube M4 .

3. A pump safety protection device for a ground gas extraction station in the gas power generation industry according to claim 1, characterized in that: A resistor R55 and a capacitor C46 connected in parallel are connected between the gate and drain of the field effect MOS tube M2, a VH signal receiving terminal is arranged on the gate of the field effect MOS tube M2, and a resistor R52 is connected to the gate of the field effect MOS tube M2.

4. A pump safety protection device for a ground gas extraction station in the gas power generation industry according to claim 1, characterized in that: A resistor R56 and a capacitor C44 connected in parallel are connected between the gate and drain of the field effect MOS tube M3, a WH signal receiving terminal is arranged on the gate of the field effect MOS tube M3, and a resistor R53 is connected to the gate of the field effect MOS tube M3.

5. According to claim 1, a pump safety protection device for a ground gas extraction station in the gas power generation industry is characterized by: A resistor R67 and a capacitor C54 connected in parallel are connected between the gate and drain of the field effect MOS tube M5 , a UL signal receiving terminal is arranged on the gate of the field effect MOS tube M5 , and a resistor R64 is connected to the gate of the field effect MOS tube M5 .

6. A pump safety protection device for a ground gas extraction station in the gas power generation industry according to claim 1, characterized in that: A resistor R68 and a capacitor C55 connected in parallel are connected between the gate and drain of the field effect MOS tube M6. A VL signal receiving terminal is provided on the gate of the field effect MOS tube M6. The gate of the field effect MOS tube M6 is connected to a resistor R65.

7. A pump safety protection device for a ground gas extraction station in the gas power generation industry according to claim 1, characterized in that: A resistor R69 and a capacitor C56 are connected in parallel between the gate and drain of the field effect MOS tube M7. A WL signal receiving terminal is provided on the gate of the field effect MOS tube M7. A resistor R66 is connected to the gate of the field effect MOS tube M7.

8. A pump safety protection device for a ground gas extraction station in the gas power generation industry according to claim 1, characterized in that: The drain of the field effect MOS tube M5 is connected to a resistor R73, the drain of the field effect MOS tube M6 is connected to a resistor R74, the drain of the field effect MOS tube M7 is connected to a resistor R75, and the connection terminals of the resistors R73, R74 and R75 are connected to a resistor R78.

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