Uninterrupted constant-pressure water supply system for underground coal mine

Abstract

The utility model relates to the technical field of water supply systems, and discloses a coal mine underground uninterrupted constant pressure water supply system which comprises a main water supply pipe leading to a working face, a water supply pipe is installed on the main water supply pipe, a water supply branch pipe is arranged on the water supply pipe, and a gate valve and a check valve are sequentially installed on the water supply branch pipe in the water flow direction. Inlets of the water supply branch pipes are connected with the output end of a water supply pump, the input end of the water supply pump is connected with a water suction pipe penetrating into the reservoir, a bottom valve is installed at the free end of the water suction pipe, the water supply pump is connected with a power source provided with a variable-frequency switch through a cable, and the variable-frequency switch is electrically connected with a pressure transmitter installed on the main water supply pipe. The pressure transmitter is provided with a pressure sensor installed on the water supply pipe. The system monitors underground water pressure change in real time and automatically adjusts the running state of the water pump according to actual requirements. By means of the intelligent adjusting mechanism, the response speed and accuracy of the water supply system are greatly improved, and the stability and safety of the underground operation environment are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to water supply system technical field, concretely for a kind of for coal mine underground uninterrupted constant-pressure water supply system. BACKGROUND

[0002] With the deepening of mining operation, the length of water supply pipeline matched with each working face in mine gradually increases, which leads to the difficulty in guaranteeing the normal water pressure safety required by working face top support, machine set operation cooling and dust reduction system, and further affects the normal operation of mining operation.In addition, in some production processes, insufficient water supply pressure or short-time water interruption may affect the equipment operating state, resulting in the need for more frequent maintenance and replacement of parts, increasing production cost, and also affecting the overall service life of the equipment, which may cause equipment failure or even damage and scrap in serious cases.If there is a fire in the working face, insufficient water supply pressure or no water supply will not be able to extinguish the fire in time, which may cause a larger fire accident.During the rescue process of trapped personnel in underground mine, water is lacking, which greatly shortens the survival time, and rescue personnel also need water to ensure their safety and carry out rescue work, such as cooling equipment to prevent explosion. SUMMARY

[0003] The utility model discloses in order to solve the current mine each working face matched water supply pipeline cannot stably guarantee water supply, affect work progress, have work hidden danger and other problems, provide a kind of for coal mine underground uninterrupted constant-pressure water supply system.

[0004] The utility model discloses the following technical scheme is realized:

[0005] A kind of for coal mine underground uninterrupted constant-pressure water supply system, including total water supply pipe to working face, water supply pipe is installed on the total water supply pipe, water supply branch pipe is opened on the water supply pipe, gate valve, check valve are installed in sequence along water flow direction on the water supply branch pipe, the import of the water supply branch pipe is connected with the output end of water supply pump, the input end of water supply pump is connected with the suction pipe of deep water storage pool, bottom valve is installed in the free end of the suction pipe, water supply pump is connected with the power supply with frequency conversion switch by cable, frequency conversion switch is electrically connected with pressure transmitter installed on total water supply pipe, pressure transmitter is provided with pressure sensor installed on water supply pipe.

[0006] In implementation, a total water supply pipe leading to a working face is provided with a water supply pipe, the water supply pipe is provided with a water supply branch pipe, the water supply branch pipe includes a first branch pipe and a second branch pipe, the water supply branch pipe is sequentially provided with a gate valve and a check valve along a water flow direction, an inlet of the water supply branch pipe is connected with an output end of a water supply pump, a power range of the water supply pump is 0-180KW, an input end of the water supply pump is connected with a water suction pipe which is deep into a reservoir, a free end of the water suction pipe is provided with a bottom valve, the water supply pump is connected with a power supply provided with a frequency conversion switch through a cable, specifically, the frequency conversion switch is provided with a main power connection cavity and a standby power connection cavity, a cable connected with the first water supply pump is connected with the main power connection cavity, a cable connected with the second water supply pump is connected with the standby power connection cavity, the main power connection cavity is connected with a main power from a bus section I, the standby power connection cavity is connected with a standby power from a bus section II, the frequency conversion switch is electrically connected with a pressure transmitter installed on the total water supply pipe, a range of the pressure transmitter is 4-20mA, the pressure transmitter is provided with a pressure sensor installed on the water supply pipe, a change of water pressure underground is monitored in real time, that is, a signal output end of the pressure transmitter is connected with the frequency conversion switch through a sensing line.

[0007] Further, an inlet of the first branch pipe is connected with an output end of the first water supply pump through a flexible joint, an input end of the first water supply pump is connected with a first water suction pipe, an inlet of the first water suction pipe is arranged in the reservoir, an inlet of the second branch pipe is connected with an output end of the second water supply pump through a flexible joint, an input end of the second water supply pump is connected with a second water suction pipe, an inlet of the second water suction pipe is arranged in the reservoir.

[0008] In use, the system is connected with an original water supply system to solve problems of poor reliability and imperfect pipe network system of the original system, a main power is supplied by a 10KV central distribution room of a coal mine, the distribution room is operated in a double power supply split mode, double power supplies are respectively led from different bus sections I and II of the central distribution room, and the double power supplies are supplied with 1140V power after being transformed by transformers.

[0009] The water supply branch pipe is connected with the water supply pipe, the gate valve is opened, the frequency conversion switch is connected, that is, a main power side start switch button of the frequency conversion switch is opened, the frequency conversion switch transmits power to the water supply pump through the cable, the bottom valve is opened, the system adopts two sets of water supply pumps, when the first water supply pump is stopped due to external reasons, electrical interlocking is realized, the second water supply pump is started automatically, when one power supply cannot supply power normally due to external reasons, another power supply can start a standby water pump automatically, and normal water supply underground of the coal mine is ensured.

[0010] In work, the pressure sensor detects the water pressure in the water supply pipe, when detecting that the water supply pressure of the water supply pipe cannot meet the water consumption of the coal mine underground, the pressure transmitter receives the signal of the pressure sensor, the frequency switch adjusts the switch frequency in the range of 0-50HZ according to the digital signal, the larger the digital signal is, the lower the frequency output of the device is, and vice versa, the frequency is adjusted according to the water consumption of the mine, the frequency switch automatically adjusts the frequency according to the received current signal strength, adjusts the motor speed of the water supply pump, and the water supply pump transmits the mine water to the working face through the water suction pipe, realizes constant pressure water supply, and realizes the constant pressure water supply state of the working face.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The constant pressure water supply system for the coal mine underground provided by the utility model can quickly adjust the working pressure of the water supply system according to the system state by combining the frequency switch and the pressure sensor, realizes constant pressure water supply, ensures that the water supply pressure remains constant during the operation of the coal mine underground, thereby improving the working stability of the system, and ensuring the safety and efficiency of the mine operation, and good control effect and remarkable energy-saving effect are achieved.

[0013] The system realizes closed-loop control of the water pressure of the total water supply pipe, ensures that the water supply system is automatically constant at the set pressure value, maintains the pressure in the water pipe in the appropriate range at all times, effectively solves the problems of insufficient pressure caused by long distance between the mining face, large energy consumption when the flow is small, the unit cannot be cooled normally, poor dustproof effect of the working face, and insufficient comprehensive fire extinguishing of the working face, thereby preventing equipment damage and fire accidents to a certain extent.

[0014] Through the implementation of the constant pressure water supply system, the water supply of each tunneling working face underground is fully covered, thereby significantly reducing the equipment damage rate, and compared with the previous year, the equipment maintenance cost is saved by 36 million yuan, and the total project saves cost by 432 million yuan.

[0015] In addition, the power consumption of the water pump is proportional to the cube of the motor speed, and the energy-saving effect is remarkable through the speed regulation operation of the water pump, and the average power consumption is saved by about 40% compared with the conventional water supply mode. The variable frequency speed regulation constant pressure water supply technology has the advantages of energy saving, safety, high water supply quality and the like. The uninterrupted constant pressure water supply speed regulation system can realize stepless speed regulation of the water pump motor, automatically adjust the system operation parameters according to the change of water consumption (i.e. the change of the pressure of the total water supply pipe), keep the water pressure constant, and meet the water demand. The system is the current advanced and reasonable energy-saving water supply system, and has important significance in practical application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The overall structure schematic diagram of the utility model is shown.

[0017] In the figure: 1 - water supply pump, 101 - first water supply pump, 102 - second water supply pump, 2 - water supply branch pipe, 201 - first branch pipe, 202 - second branch pipe, 3 - frequency switch, 4 - flexible joint, 5 - gate valve, 6 - check valve, 7 - water supply pipe, 8 - pressure sensor, 9 - pressure transmitter, 10 - cable, 11 - bottom valve, 12 - water suction pipe, 13 - total water supply pipe, 14 - water storage tank. DETAILED DESCRIPTION

[0018] The specific embodiments of the utility model will be described below in combination with the drawings.

[0019] A kind of for coal mine underground uninterrupted constant pressure water supply system, as shown in Figure 1 Fig. 1): including total water supply pipe 13 to working face, water supply pipe 7 is installed on the total water supply pipe 13, water supply branch pipe 2 is opened on the water supply pipe 7, the water supply branch pipe 2 includes first branch pipe 201 and second branch pipe 202, gate valve 5, check valve 6 are sequentially installed on the water supply branch pipe 2 along the direction of water flow, the inlet of the water supply branch pipe 2 is connected with the output end of water supply pump 1, the power range of water supply pump 1 is 0-180KW, the input end of water supply pump 1 is connected with water suction pipe 12 that goes into water storage tank 14, bottom valve 11 is installed at the free end of water suction pipe 12, water supply pump 1 is connected with power supply that is equipped with frequency switch 3 by cable 10, specifically, frequency switch 3 is equipped with main power wiring cavity and standby power wiring cavity, the cable connected with first water supply pump 101 is connected on main power wiring cavity, the cable connected with second water supply pump 102 is connected on standby power wiring cavity, main power wiring cavity is connected with main power from busbar section I section, standby power wiring cavity is connected with standby power from busbar section II section;Frequency switch 3 is electrically connected with pressure transmitter 9 installed on total water supply pipe 13, the range of pressure transmitter is 4-20mA, pressure sensor 8 installed on water supply pipe 7 is provided on pressure transmitter 9, real-time monitoring of downhole water pressure change, i.e. the signal output end of pressure transmitter 9 is connected with frequency switch 3 through sensing line.

[0020] Further, the inlet of the first branch pipe 201 is connected with the output end of the first water supply pump 101 through the flexible joint 4, the input end of the first water supply pump 101 is connected with the first water suction pipe, and the inlet of the first water suction pipe is arranged in the water storage tank 14; the inlet of the second branch pipe 202 is connected with the output end of the second water supply pump 102 through the flexible joint 4, the input end of the second water supply pump 102 is connected with the second water suction pipe, and the inlet of the second water suction pipe is arranged in the water storage tank 14.

[0021] When in use, the system is connected to the original water supply system to solve the problems of poor reliability and imperfect pipe network system of the original system. The main power supply is 10KV central power distribution room centralized power supply in the coal mine, and the power distribution room adopts double power supply parallel operation. The double power supply is respectively introduced from different bus sections I and II of the central power distribution room, and 1140V power supply is used after the transformer is transformed.

[0022] The water supply branch pipe 2 is connected to the water supply pipe 7, the gate valve 5 is opened, the frequency conversion switch 3 is connected, that is, the main power supply side start switch button of the frequency conversion switch 3 is opened, the frequency conversion switch 3 transmits power to the water supply pump 1 through the cable 10, the bottom valve 11 is opened, and the system adopts two sets of water supply pumps. When the first water supply pump 101 is stopped due to external reasons, the electrical interlocking is realized, the frequency conversion switch 3 is automatically started, the second water supply pump 102 is realized to supply water, and when one power supply cannot normally supply power due to external reasons, the other power supply can automatically start the standby water pump, so that the normal water supply in the coal mine is ensured.

[0023] When working, the pressure sensor 8 detects the water pressure in the water supply pipe 7. When it is detected that the water supply pressure of the water supply pipe 7 cannot meet the water consumption in the coal mine, the pressure transmitter 9 receives the signal of the pressure sensor 8, the frequency conversion switch 3 adjusts the switch frequency in the range of 0-50HZ according to the digital signal, the larger the digital signal is, the lower the output frequency of the device is, and vice versa. The frequency is adjusted according to the water consumption of the mine, the frequency conversion switch 3 automatically adjusts the frequency according to the received current signal strength, adjusts the motor speed of the water supply pump 1, and the water supply pump 1 transmits the mine water to the working face through the water suction pipe, so as to realize constant pressure water supply and constant pressure water supply state of the working face.

[0024] The scope of protection of the utility model is not limited to the above specific embodiments, and for those skilled in the art, the utility model can have various modifications and changes. Any modification, improvement and equivalent replacement within the concept and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A continuous constant pressure water supply system for underground coal mines, comprising a main water supply pipe (13) leading to the working face, wherein a water supply pipe (7) is installed on the main water supply pipe (13), characterized in that: A water supply branch pipe (2) is opened on the water supply pipe (7). A gate valve (5) and a check valve (6) are installed in sequence along the water flow direction on the water supply branch pipe (2). The inlet of the water supply branch pipe (2) is connected to the output end of the water supply pump (1). The input end of the water supply pump (1) is connected to a suction pipe (12) that extends into the water storage tank (14). A foot valve (11) is installed at the free end of the suction pipe (12). The water supply pump (1) is connected to a power supply equipped with a frequency converter (3) through a cable (10). The frequency converter (3) is electrically connected to a pressure transmitter (9) installed on the main water supply pipe (13). A pressure sensor (8) is installed on the water supply pipe (7) on the pressure transmitter (9).

2. The uninterrupted constant pressure water supply system for underground coal mines according to claim 1, characterized in that: The water supply branch pipe (2) includes a first branch pipe (201) and a second branch pipe (202). The inlet of the first branch pipe (201) is connected to the output end of the first water supply pump (101) through a flexible connector (4). The input end of the first water supply pump (101) is connected to the first suction pipe. The inlet of the first suction pipe is located in the water storage tank (14). The inlet of the second branch pipe (202) is connected to the output end of the second water supply pump (102) through a flexible connector (4). The input end of the second water supply pump (102) is connected to the second suction pipe. The inlet of the second suction pipe is located in the water storage tank (14).

3. A continuous constant pressure water supply system for underground coal mines according to claim 2, characterized in that: The frequency converter switch (3) is provided with a main power supply wiring cavity and a backup power supply wiring cavity. The cable connecting the first water supply pump (101) is connected to the main power supply wiring cavity, and the cable connecting the second water supply pump (102) is connected to the backup power supply wiring cavity. The main power supply wiring cavity is connected to the main power supply from bus section I, and the backup power supply wiring cavity is connected to the backup power supply from bus section II.

4. A continuous constant pressure water supply system for underground coal mines according to claim 1, characterized in that: The signal output terminal of the pressure transmitter (9) is connected to the frequency converter (3) via a sensor line.

5. A continuous constant pressure water supply system for underground coal mines according to claim 1, characterized in that: The pressure transmitter has a range of 4-20mA.

6. A continuous constant pressure water supply system for underground coal mines according to claim 1, characterized in that: The power range of the water supply pump (1) is 0-180KW.

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