A multi-stage pump variable frequency constant pressure water supply system for coal seam drilling and punching

Abstract

This utility model provides a multi-stage pump frequency conversion constant pressure water supply system for coal seam drilling and punching. The outlet of the pressure stabilizing tank (3) is connected to the inlet of the centralized water supply unit. The centralized water supply unit is connected to several secondary distribution water supply units (5) through several water supply branch pipes of the water supply manifold (14). The control signal line of the secondary distribution water supply unit (5) is connected to the centralized controller (1) through the first switch (6). The centralized controller (1) is connected to the centralized water supply unit through the frequency converter (2). The control signal lines of the valves and pressure and flow detection in the centralized water supply unit are connected to the centralized controller (1). The control console (7), the ground monitoring platform (10) and the centralized controller (1) are connected to realize information transmission. This system adopts a combination of centralized water supply and secondary distribution water supply, replacing the emulsion pump station, realizing automatic constant pressure water supply for coal seam drilling and punching, and improving the quality of drilling and punching.

Description

Technical Field

[0001] This utility model relates to the field of coalbed methane depressurization and outburst suppression technology, specifically to a multi-stage pump frequency conversion constant pressure water supply system for coalbed drilling and punching. Background Technology

[0002] For coal seams with high gas content and pressure, the "Detailed Rules for the Prevention and Control of Coal and Gas Outbursts" clearly stipulates that when adopting regional outburst prevention measures such as pre-draining coal seam gas, it is necessary to excavate the bottom rock roadway and conduct cross-layer drilling to eliminate outbursts in coal roadway strips and sections of coal seams. Currently, in the process of eliminating outbursts by depressurizing coal roadway strips and regional coal seam depressurizing, emulsion pumps are one of the key pieces of equipment for cross-layer drilling in bottom rock roadways. Since these operations are mainly carried out in a decentralized manner, the emulsion pumps need to be moved frequently. Furthermore, due to the complex power and water supply networks for the emulsion pumps, the labor intensity of cross-layer drilling operations in bottom rock roadways is high, and safety cannot be effectively guaranteed. Furthermore, decentralized emulsion pump stations cannot meet the needs of automatic and centralized water supply. They mainly rely on manual adjustment of the water supply pressure of the emulsion pump stations. At the same time, they are affected by the variable underground environment and human operation errors, which can easily cause unstable water supply pressure in the drilling and punching of bottom rock roadways. This directly affects the quality of drilling and punching, and in turn affects the elimination of coal seam outbursts in coal roadways and sections.

[0003] Therefore, in order to ensure stable water supply pressure for drilling and punching through layers in bottom rock roadways, guarantee the quality of drilling and punching, reduce labor intensity, and improve the automation level and operational efficiency of water supply for drilling and punching through layers in bottom rock roadways, there is an urgent need for a constant pressure water supply system for coal seam drilling and punching that has stable water supply pressure, a high degree of automation, and the ability to provide centralized water supply. Utility Model Content

[0004] This invention proposes a multi-stage pump variable frequency constant pressure water supply system for coal seam drilling and punching. It replaces the emulsion pump station with a multi-stage pump and adopts a method of centralized water supply from the pump house and secondary distribution water supply from the drilling and punching face. It is combined with a control unit mainly composed of programmable logic controller and frequency converter to realize automatic constant pressure water supply for drilling and punching through layers in the bottom rock roadway, ensuring the quality of drilling and punching, and improving the efficiency of coal roadway strip outburst suppression and section coal seam outburst suppression operations.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A multi-stage pump frequency conversion constant pressure water supply system for coal seam drilling and punching includes a centralized controller, a frequency converter, a pressure stabilizing tank, a centralized water supply unit, a secondary distribution water supply unit, a first exchange, a control console, a valve control box, a second exchange, and a ground monitoring platform. The outlet of the pressure stabilizing tank is connected to the centralized water supply unit via a pipeline, and the outlet of the centralized water supply unit is connected to the water supply manifold. A safety valve, an outlet pressure sensor, and a flow sensor are sequentially installed along the flow direction of the medium within the water supply manifold. The water supply manifold is connected to several secondary distribution water supply units via several water supply branch pipes and shut-off valves. The control signal lines of each secondary water distribution unit are connected to the central controller through the first switch. The central controller is connected to the central water supply unit through a frequency converter. The control signal lines of the valves in the central water supply unit are connected to the central controller through the valve control box. The control signal lines of the pressure detection in the central water supply unit and the control signal lines of the outlet pressure sensor and flow sensor of the water supply manifold are directly connected to the central controller to monitor the fluid medium pressure and flow information at the inlet and outlet of the central water supply unit in real time. The control center is connected to the central controller to control the entire water supply system. The ground monitoring platform is connected to the central controller through the second switch.

[0006] Furthermore, the centralized water supply unit includes several centralized water supply branches installed in parallel. A first shut-off valve, an inlet pressure sensor, a multistage pump, a first manual ball valve, a check valve, and an electric gate valve are installed sequentially along the flow direction of the fluid medium in the centralized water supply branch. The three-phase asynchronous motor of the multistage pump in each centralized water supply branch is connected to the output terminal of the frequency converter. The inlet pressure sensor of the centralized water supply branch is connected to the centralized controller. The electric gate valve of the centralized water supply branch is connected to the centralized controller through a valve control box.

[0007] The inlet pressure sensor in the centralized water supply branch and the outlet pressure sensor in the water supply manifold monitor the inlet and outlet pressures of the multi-stage pumps in the centralized water supply branch in real time, respectively. Combined with the power frequency of the multi-stage pumps, the real-time head and flow rate of the multi-stage pumps are calculated, providing accurate data support for the secondary distribution water supply unit to supply fluid media that meet the design requirements.

[0008] Furthermore, the multi-stage pumps in the centralized water supply branch of the centralized water supply unit are MD type mining wear-resistant multi-stage pumps, MD(P) type mining wear-resistant self-balancing multi-stage pumps, horizontal split-case multi-stage pumps, segmental multi-stage pumps, and flow channel multi-stage pumps. The head of the multi-stage pump is changed by increasing or decreasing the number of stages.

[0009] Furthermore, the secondary water distribution unit consists of a secondary water distribution manifold, several drilled and punched branch pipes, an end acquisition control unit, a water manifold pressure sensor, and a water manifold pressure gauge. The bottom inlet of the secondary water distribution manifold is connected to the water supply manifold through a water supply branch pipe, and several outlets at the top of the secondary water distribution manifold are respectively connected to several drilled and punched branch pipes. The water manifold pressure sensor and the water manifold pressure gauge are respectively installed on the top of the secondary water distribution manifold. The water manifold pressure sensor collects the pressure of the fluid medium in the secondary water distribution manifold in real time and is connected to the end acquisition control unit through a signal line. Each drilled and punched branch pipe is connected to the end acquisition control unit through a control signal line, and the end acquisition control unit is connected to the first switch through a control signal line.

[0010] Furthermore, the drilling and punching branch pipe consists of a second manual ball valve, a Y-type filter, a punching throttle valve, a punching electric ball valve, a drilling throttle valve, a drilling electric ball valve, a third manual ball valve, and a branch pipe pressure gauge. The punching throttle valve and the punching electric ball valve constitute the punching branch pipe, and the drilling throttle valve and the drilling electric ball valve constitute the drilling branch pipe. The punching branch pipe and the drilling branch pipe are installed in parallel on the drilling and punching branch pipe. The second manual ball valve and the third manual ball valve are respectively installed at the inlet and outlet ends of the drilling and punching branch pipe. The Y-type filter is installed behind the second manual ball valve, and the branch pipe pressure gauge is installed at the outlet end of the drilling and punching branch pipe and positioned in front of the third manual ball valve. The punching electric ball valve and the drilling electric ball valve are respectively connected to the end-user acquisition and control unit via control signal lines, enabling real-time control of their opening and closing states.

[0011] Furthermore, the sum of the rated flow rates of all multi-stage pumps in the centralized water supply branch pipe is greater than the sum of the design flow rates of all drilling and punching branch pipes, and the outlet pressure value of the multi-stage pumps in the centralized water supply branch pipe under rated conditions is greater than the design pressure value of the drilling and punching branch pipe.

[0012] Compared with the prior art, the multi-stage pump variable frequency constant pressure water supply system for coal seam drilling and punching described in this utility model has the following beneficial effects:

[0013] (1) The centralized water supply unit can provide a stable pressure drilling and punching medium for multiple secondary distribution water supply units, avoiding the frequent movement of emulsion pump stations, and can also meet the long-distance constant pressure water supply needs, greatly reducing the labor intensity of operators and simplifying the supply operation of constant pressure water supply for drilling and punching.

[0014] (2) Multiple drilling and punching branch pipes of the secondary distribution water supply unit can simultaneously provide stable drilling and punching media to multiple drilling rigs. The secondary distribution water supply unit can adjust its position according to the change of the coal seam working face. Furthermore, a drilling and punching branch pipe can cooperate with a drilling rig to realize the linkage of the coal seam working face drilling rig group, which greatly improves the efficiency of coal seam drilling and punching.

[0015] (3) The punching branch pipe is equipped with punching branch pipe and drilling branch pipe. The punching branch pipe and drilling branch pipe adjust the fluid medium pressure of their respective branch pipes through punching throttle valve and drilling throttle valve, respectively. At the same time, the interlocking function of punching electric ball valve and drilling electric ball valve realizes the seamless switching between punching operation and drilling operation during drilling operation.

[0016] (4) By connecting the centralized controller with the control center and the ground monitoring platform, dual monitoring of underground and above-ground operations is realized, which improves the automation level of the constant pressure water supply system in coal seam drilling and punching operations, reduces the number of operators, and saves equipment operation and maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structural system of this utility model;

[0018] Figure 2 This is a diagram of the centralized water supply branch system of this utility model;

[0019] Figure 3 This is a system diagram of the secondary water distribution unit of this utility model;

[0020] Figure 4 This is a diagram of the drilling and punching branch pipe system of this utility model.

[0021] The diagram is labeled as follows: 1: Central controller; 2: Frequency converter; 3: Pressure stabilizing tank; 4: Central water supply branch; 41: First shut-off valve; 42: Inlet pressure sensor; 43: Multistage pump; 44: First manual ball valve; 45: Check valve; 46: Electric gate valve; 5: Secondary distribution water supply unit; 51: Secondary water distributor; 52: Drilled and punched branch pipe; 521: Secondary manual ball valve; 522: Y-type filter; 523: Punched throttle valve; 524: Punched... 525: Electric ball valve; 526: Drilling throttle valve; 527: Third manual ball valve; 528: Branch pipe pressure gauge; 53: End acquisition and control unit; 54: Water collector pressure sensor; 55: Water collector pressure gauge; 6: First exchange; 7: Control center; 8: Valve control box; 9: Second exchange; 10: Ground monitoring platform; 11: Safety valve; 12: Outlet pressure sensor; 13: Flow sensor; 14: Water supply manifold. Detailed Implementation

[0022] In the description of this utility model, it should be noted that the terms "left", "right", "front", "rear", "inner", "outer", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the fluid medium flow direction shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] To make the technical problem to be solved, the technical solution and the implementation effect of this utility model clearer, the following is in conjunction with the appendix. Figure 1-4 An embodiment of the present invention will be further described below:

[0024] See appendix Figure 1-4 As a preferred embodiment, the multi-stage pump frequency conversion constant pressure water supply system for coal seam drilling and punching described in this utility model includes a centralized controller 1, a frequency converter 2, a pressure stabilizing tank 3, a centralized water supply unit, a secondary distribution water supply unit 5, a first exchange 6, a control console 7, a valve control box 8, a second exchange 9, and a ground monitoring platform 10. The outlet of the pressure stabilizing tank 3 is connected to the centralized water supply unit via a pipeline. The outlet of the centralized water supply unit is connected to a water supply manifold 14. A safety valve 11, an outlet pressure sensor 12, and a flow sensor 13 are sequentially installed along the flow direction of the medium within the water supply manifold 14. The water supply manifold 14 is connected to several secondary distribution water supply units 5 via several water supply branch pipes and shut-off valves. Each secondary distribution water supply unit 5 provides constant pressure water to different drilling rigs. The control signal lines of each secondary distribution water supply unit 5 are connected via the first exchange 6. The switch 6 is connected to the centralized controller 1, which is connected to the centralized water supply unit via the frequency converter 2. The pressure of the fluid medium in the water supply manifold 14 is stabilized by changing the frequency of the motor in the centralized water supply unit. The control signal lines of the valves in the centralized water supply unit are connected to the centralized controller 1 via the valve control box 8. The control signal lines of the pressure detection in the centralized water supply unit and the control signal lines of the outlet pressure sensor 12 and flow sensor 13 of the water supply manifold 14 are directly connected to the centralized controller 1 to monitor the pressure and flow information of the fluid medium at the inlet and outlet of the centralized water supply unit in real time. The control console 7 is connected to the centralized controller 1 to control the entire water supply system. The ground monitoring platform 10 is connected to the centralized controller 1 via the second switch 9 to realize remote monitoring of the entire water supply system and store and manage the monitoring information of the water supply system.

[0025] As a preferred embodiment, see Appendix Figure 1 and 2The centralized water supply unit includes several centralized water supply branches 4 installed in parallel. A first shut-off valve 41, an inlet pressure sensor 42, a multistage pump 43, a first manual ball valve 44, a check valve 45, and an electric gate valve 46 are installed sequentially along the flow direction of the fluid medium in the centralized water supply branch 4. The three-phase asynchronous motor of the multistage pump 43 in each centralized water supply branch 4 is connected to the output terminal of the frequency converter 2. The power frequency of the three-phase asynchronous motor is adjusted by the frequency converter 2 to adjust the pressure of the fluid medium in the centralized water supply branch 4. The inlet pressure sensor 42 of the centralized water supply branch 4 is connected to the centralized controller 1. The electric gate valve 46 of the centralized water supply branch 4 is connected to the centralized controller 1 through the valve control box 8.

[0026] See appendix Figure 1 and 2 The inlet pressure sensor 42 in the centralized water supply branch 4 and the outlet pressure sensor 12 in the water supply manifold 14 monitor the inlet and outlet pressures of the multistage pump 43 in the centralized water supply branch 4 in real time, respectively. Combined with the power frequency of the multistage pump 43, the real-time head and flow rate of the multistage pump 43 are calculated, providing accurate data support for the secondary distribution water supply unit 5 to supply fluid media that meet the design requirements.

[0027] See appendix Figure 2 The multistage pump 43 in the centralized water supply branch 4 of the centralized water supply unit is an MD type mining wear-resistant multistage pump, an MD(P) type mining wear-resistant self-balancing multistage pump, a horizontal split-case multistage pump, a segmental multistage pump, and a flow channel multistage pump. The head of the multistage pump 43 can be changed by increasing or decreasing the number of stages.

[0028] As a preferred embodiment, see Appendix Figure 1 , 3 The secondary water distribution unit 5, as described in section 4, consists of a secondary water distribution manifold 51, several drilled and punched branch pipes 52, an end acquisition control unit 53, a water manifold pressure sensor 54, and a water manifold pressure gauge 55. The bottom inlet of the secondary water distribution manifold 51 is connected to the water supply manifold 14 through a water supply branch pipe, and several outlets at the top of the secondary water distribution manifold 51 are respectively connected to several drilled and punched branch pipes 52. The water manifold pressure sensor 54 and the water manifold pressure gauge 55 are respectively installed on the top of the secondary water distribution manifold 51. The water manifold pressure sensor 54 collects the pressure of the fluid medium in the secondary water distribution manifold 51 in real time and is connected to the end acquisition control unit 53 through a signal line. The water manifold pressure gauge 55 can directly display the pressure of the fluid medium in the secondary water distribution manifold 51, which is convenient for on-site operators to observe and record. Each drilled and punched branch pipe 52 is connected to the end acquisition control unit 53 through a control signal line, and the end acquisition control unit 53 is connected to the first switch 6 through a control signal line.

[0029] See appendix Figure 1 , 3 4. The drilling and punching branch pipe 52 is composed of a second manual ball valve 521, a Y-type filter 522, a punching throttle valve 523, a punching electric ball valve 524, a drilling throttle valve 525, a drilling electric ball valve 526, a third manual ball valve 527, and a branch pipe pressure gauge 528. The punching throttle valve 523 and the punching electric ball valve 524 constitute the punching branch pipe, and the drilling throttle valve 525 and the drilling electric ball valve 526 constitute the drilling branch pipe. The punching branch pipe and the drilling branch pipe are installed on the drilling and punching branch pipe 52 in parallel. The second manual ball valve 521 and the third manual ball valve 527 are respectively installed at the inlet and outlet ends of the drilling and punching branch pipe 52, enabling timely... The drilling and punching branch pipe 52 can be manually started and stopped, which also facilitates its maintenance and upkeep. The Y-type filter 522 is installed after the second manual ball valve 521 to filter the fluid medium in the drilling and punching branch pipe 52, while protecting the punching throttle valve 523 and the drilling throttle valve 525. The branch pipe pressure gauge 528 is installed at the outlet end of the drilling and punching branch pipe 52 and is located in front of the third manual ball valve 527 to facilitate real-time monitoring of the pressure of the fluid medium in the drilling and punching branch pipe 52. The punching electric ball valve 524 and the drilling electric ball valve 526 are respectively connected to the end acquisition and control unit 53 through control signal lines, which can control their opening and closing status in real time.

[0030] As a preferred embodiment, see Appendix Figure 1 The total rated flow of all multi-stage pumps 43 in the centralized water supply branch pipe is greater than the total designed flow of all drilling and punching branch pipes 52, and the outlet pressure of the multi-stage pumps 43 in the centralized water supply branch pipe under rated conditions is greater than the design pressure of the drilling and punching branch pipes 52.

[0031] As a preferred embodiment, see Appendix Figure 1-4 The multi-stage pump variable frequency constant pressure water supply system for coal seam drilling and punching describes a system where a centralized controller 1 controls the rotational speed of the multi-stage pumps 43 in the centralized water supply branch 4 via a frequency converter 2, providing a stable-pressure fluid medium to the secondary distribution water supply unit 5. The secondary distribution water supply unit 5 then provides a stable-pressure fluid medium to different drilling rigs through several drilling and punching branch pipes 52. Furthermore, since the fluid medium pressure required by the drilling rig differs during drilling and punching operations, the drilling and punching branch pipes 52 of this invention are configured with both punching and drilling branch pipes. An interlocking function between the punching and drilling branch pipes is implemented through a control program, further ensuring a stable and precise fluid medium pressure for both drilling and punching operations.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage pump variable frequency constant pressure water supply system for coal seam drilling and punching, comprising a centralized controller (1), a frequency converter (2), a pressure stabilizing tank (3), a centralized water supply unit, a secondary distribution water supply unit (5), a first exchange (6), a control console (7), a valve control box (8), a second exchange (9), and a ground monitoring platform (10), characterized in that: The outlet of the pressure stabilizing tank (3) is connected to the centralized water supply unit via a pipeline. The outlet of the centralized water supply unit is connected to the water supply manifold (14). A safety valve (11), an outlet pressure sensor (12), and a flow sensor (13) are installed sequentially along the flow direction of the medium in the water supply manifold (14). The water supply manifold (14) is connected to several secondary distribution water supply units (5) via several water supply branch pipes and shut-off valves. The control signal line of each secondary distribution water supply unit (5) is connected to the centralized controller (1) via the first switch (6). The central controller (1) is connected to the centralized water supply unit through the frequency converter (2). The control signal line of the valve in the centralized water supply unit is connected to the central controller (1) through the valve control box (8). The control signal line of the pressure detection in the centralized water supply unit and the control signal line of the outlet pressure sensor (12) and flow sensor (13) of the water supply manifold (14) are directly connected to the central controller (1). The control console (7) is connected to the central controller (1). The ground monitoring platform (10) is connected to the central controller (1) through the second switch (9).

2. The multi-stage pump variable frequency constant pressure water supply system for coal seam drilling and punching as described in claim 1, characterized in that: The centralized water supply unit includes several centralized water supply branches (4) installed in parallel. A first shut-off valve (41), an inlet pressure sensor (42), a multistage pump (43), a first manual ball valve (44), a check valve (45), and an electric gate valve (46) are installed sequentially along the flow direction of the fluid medium in the centralized water supply branch (4). The three-phase asynchronous motor of the multistage pump (43) in each centralized water supply branch (4) is connected to the output end of the frequency converter (2). The inlet pressure sensor (42) of the centralized water supply branch (4) is connected to the centralized controller (1). The electric gate valve (46) of the centralized water supply branch (4) is connected to the centralized controller (1) through the valve control box (8).

3. A multi-stage pump frequency conversion constant pressure water supply system for coal seam drilling and perforation as described in claim 1 or 2, characterized in that: The multistage pump (43) of the centralized water supply branch (4) in the centralized water supply unit is any one of the following: MD type mine wear-resistant multistage pump, MD(P) type mine wear-resistant self-balancing multistage pump, horizontal split-case multistage pump, segmental multistage pump and flow channel multistage pump.

4. The multi-stage pump variable frequency constant pressure water supply system for coal seam drilling and punching as described in claim 1, characterized in that: The secondary water distribution unit (5) consists of a secondary water distribution manifold (51), several drilled and punched branch pipes (52), an end acquisition control unit (53), a water collector pressure sensor (54), and a water collector pressure gauge (55). The bottom inlet of the secondary water distribution manifold (51) is connected to the water supply manifold (14) through a water supply branch pipe. Several outlets at the top of the secondary water distribution manifold (51) are connected to several drilled and punched branch pipes (52). The water collector pressure sensor (54) and the water collector pressure gauge (55) are installed on the top of the secondary water distribution manifold (51). The water collector pressure sensor (54) is connected to the end acquisition control unit (53) through a signal line. Each drilled and punched branch pipe (52) is connected to the end acquisition control unit (53) through a control signal line. The end acquisition control unit (53) is connected to the first switch (6) through a control signal line.

5. A multi-stage pump frequency conversion constant pressure water supply system for coal seam drilling and perforation as described in claim 1 or 4, characterized in that: The drilling and punching branch pipe (52) consists of a second manual ball valve (521), a Y-type filter (522), a punching throttle valve (523), a punching electric ball valve (524), a drilling throttle valve (525), a drilling electric ball valve (526), ​​a third manual ball valve (527), and a branch pipe pressure gauge (528). The punching throttle valve (523) and the punching electric ball valve (524) constitute the punching branch pipe, and the drilling throttle valve (525) and the drilling electric ball valve (526) constitute the drilling branch pipe. The punching branch pipe and the drilling branch pipe are installed in parallel on the drilling and punching branch pipe (528). 2) The second manual ball valve (521) and the third manual ball valve (527) are respectively installed at the inlet and outlet of the drilling and punching branch pipe (52). The Y-type filter (522) is installed behind the second manual ball valve (521). The branch pipe pressure gauge (528) is installed at the outlet of the drilling and punching branch pipe (52) and is located in front of the third manual ball valve (527). The punching electric ball valve (524) and the drilling electric ball valve (526) are respectively connected to the end acquisition control unit (53) through the control signal line, which can control the opening and closing status of the two in real time.

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