Parallel multi-stage centrifugal pump constant-pressure water supply device

Abstract

The utility model provides a parallel type multi-stage centrifugal pump constant pressure water supply device which is characterized in that a surge tank A (31) and a surge tank B (32) are connected in series through a surge connecting pipe (4) and are close to a water sump, and a water inlet of the surge tank A (31) is connected with a water outlet of a submersible pump in the water sump through a pipeline; a water outlet of the second surge tank (32) is connected with one end of a water inlet collecting pipe (9) through a connecting inclined pipe (5), water inlets of a plurality of water supply units installed in parallel are connected with the water inlet collecting pipe (9) through water inlet branch pipes respectively, and water outlets of the water supply units are connected with a water outlet collecting pipe (10) through water outlet branch pipes respectively. And the other end of the water outlet collecting pipe (10) is respectively connected with the water supply high-pressure nozzles through a plurality of branch pipes. According to the device, constant-pressure water supply is realized by monitoring the water pressure of the water requiring end, adjusting the rotating speed of the variable frequency motors (7) of the water supply units mounted in parallel or increasing or decreasing the opening number of the water supply units.

Description

TECHNICAL FIELD

[0001] The utility model relates to multistage centrifugal pump constant pressure water supply technical field, concretely relates to a kind of parallel connection type multistage centrifugal pump constant pressure water supply device. BACKGROUND

[0002] The geological structure of most coalfields in China is relatively complex, the coal seams are not stable, and the occurrence varies greatly, especially the thickness of coal seams often changes. Due to the superimposed stress concentration area, the gas occurrence is unstable, and with the deepening of the mining depth of coal mines in China, the gas emission and outburst danger increase year by year. At present, in order to relieve the pressure of coal reservoirs and eliminate outburst, and efficiently exploit coalbed methane, high-pressure water jet is usually used to unload coal, hydraulic fracturing and protective layer mining are used as regional outburst prevention measures, and low-level drilling field high-level borehole, high-level drilling field large-diameter horizontal long borehole, upper corner insertion pipe and raise-in buried pipe, grid drainage technology are used to extract gas in goaf and coal seams, which effectively solves the problem of gas overrun in the upper corner and working face.

[0003] However, when using the regional outburst prevention measure of pre-extracting coal seam gas, it is necessary to excavate floor roadway to construct through-hole drilling for coal roadway strip outburst elimination and section coal seam outburst elimination. This pressure relief and outburst elimination method for coal reservoir mainly uses floor gas extraction drilling and hydraulic punching operation. This operation mode mainly uses dispersed emulsion pump operation, and the emulsion pump station needs to be frequently moved during operation, which has high energy consumption, large emulsion consumption, high equipment failure rate, high operation and maintenance cost, and is not easy to realize automatic control using dispersed emulsion pump operation, which easily causes unstable water pressure in punching, affects the quality of hydraulic punching, and further affects the efficiency of pressure relief and outburst elimination and gas extraction.

[0004] Therefore, it is necessary to replace the emulsion pump with a mine multistage centrifugal pump, concentrate the mine multistage centrifugal pump in the chamber of the mine, effectively solve the problem of frequent movement of punching equipment during hydraulic punching operation, use the mine multistage centrifugal pump to realize constant pressure water supply, and solve the problem of unstable water pressure during hydraulic punching operation. SUMMARY

[0005] The utility model provides a kind of parallel connection type multistage centrifugal pump constant pressure water supply device, through the parallel operation mode of mine multistage centrifugal pump, it can concentrate parallel connection type multistage centrifugal pump constant pressure water supply device in the chamber of the mine, and realize constant pressure water supply using pressure stabilizing tank and frequency converter joint, to realize the efficient pressure relief and outburst elimination of coal reservoir and hydraulic punching operation.

[0006] In order to achieve the above object, the technical scheme of the utility model is as follows: a parallel type multistage centrifugal pump constant pressure water supply device, including pressure tank A, pressure tank B, water supply unit, water outlet branch pipe, water inlet branch pipe, water inlet header and water outlet header, wherein pressure tank A, pressure tank B and a plurality of water supply units are fixed in "one" type on the floor of the chamber, pressure tank A and pressure tank B are connected in series through pressure connection pipe and are close to the water sump, pressure tank A and pressure tank B are fixed on the pressure tank foundation of the chamber through the base bolt respectively, the water inlet of pressure tank A is connected with the water outlet of the submersible pump in the water sump through the pipeline, the water inlet pipeline of pressure tank A is installed with manual gate valve A and is close to the water inlet of manual gate valve A, the water outlet of pressure tank B is connected with one end of the water inlet header through the connecting inclined pipe, the other end of the water inlet header is blocked with the blocking structure, the water inlets of a plurality of water supply units installed in parallel are connected with the water inlet header through the water inlet branch pipe respectively, a plurality of water inlet branch pipes are installed horizontally and are perpendicular to the axis of the water inlet header, the water outlets of a plurality of water supply units are connected with the water outlet header through the water outlet branch pipe respectively, a plurality of water outlet branch pipes are installed vertically and are perpendicular to the axis of the water outlet header, the other end of the water outlet header is connected with the water supply high pressure nozzle through a plurality of branch pipes respectively.

[0007] Further, the water supply unit comprises a multistage pump, a variable frequency motor and a base, wherein the multistage pump and the variable frequency motor are fixed on the same base, the base is installed on the foundation of the water supply unit in the chamber through the fixing bolt, the pump shaft of the multistage pump is connected with the output shaft of the variable frequency motor through the coupling, the outside of the coupling is provided with a protective cover, and the protective cover is installed on the base through the bottom bolt.

[0008] Further, the water inlet branch pipe comprises a rubber short connection and a manual gate valve B, the rubber short connection is installed at the water inlet flange of the water supply unit through the flange, the manual gate valve B is installed at the other end of the rubber short connection through the bolt, the other end of the manual gate valve B is connected with the water inlet header through the pipeline, and the connection part of the water inlet branch pipe and the water inlet header adopts the welding mode.

[0009] Further, the water outlet branch pipe comprises a water outlet short connection, an electric gate valve and a check valve, one end of the water outlet short connection is fixed at the water outlet flange of the water supply unit through the flange, the other end of the water outlet short connection is sequentially installed with the electric gate valve and the check valve through the flange connection mode, the other end of the check valve is connected with the water outlet header through the pipeline, and the connection part of the water outlet branch pipe and the water outlet header adopts the welding mode.

[0010] Further, the water outlet header is fixed through a tripod, the tripod is connected to the I-beam on the top of the chamber through the anchor rod, and the tripod is arranged at the connection part of the water outlet branch pipe and the water outlet header of each water supply unit.

[0011] Compared with the prior art, the constant pressure water supply device of the parallel type multistage centrifugal pump can guarantee the water pressure stability of the water inlet of each water supply unit, improve the stability of the water supply unit operation, and realize the constant pressure water supply purpose through adjusting the rotating speed of the frequency conversion motor of the water supply unit or increasing or decreasing the opening quantity of the water supply unit. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the whole structure schematic diagram of the utility model;

[0013] Figure 2 It is the top view of Figure 1 .

[0014] Figure 3 It is the A place partial enlarged view of Figure 1 .

[0015] Figure 4 It is the B place partial enlarged view of Figure 2 .

[0016] Marked as in the drawing: 1: chamber;2: manual gate valve A;31: pressure tank A;32: pressure tank B;4: pressure connection pipe;5: connecting inclined pipe;6: multistage pump;7: frequency conversion motor;8: protective cover;9: water inlet header;10: water outlet header;11: water outlet short connection;12: electric gate valve;13: check valve;14: rubber short connection;15: manual gate valve B. DETAILED DESCRIPTION

[0017] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "left", "right", "front", "back", "inner", "outer", "two ends", "one end", "another end" and the like are the orientation or position relation shown in the drawing, and are only for the convenience of describing the utility model, and are not indicative or suggestive of the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore can not be understood as the limitation to the utility model.

[0018] In order to make the technical problem, technical scheme and implementation effect to be solved by the utility model more clear, the following is further described in combination with the drawings of the utility model Figures 1-4 One embodiment of the utility model is further described:

[0019] Reference is made to the drawings of Figures 1-4The parallel multi-stage centrifugal pump constant pressure water supply device comprises a constant pressure tank A 31, a constant pressure tank B 32, a water supply unit, a water outlet branch pipe, a water inlet branch pipe, a water inlet header 9 and a water outlet header 10, wherein the constant pressure tank A 31, the constant pressure tank B 32 and the water supply units are fixed in a “one” shape on the floor of the chamber 1, the constant pressure tank A 31 and the constant pressure tank B 32 are connected in series through a constant pressure connecting pipe 4 and are close to the water sump, the constant pressure tank A 31 and the constant pressure tank B 32 are fixed on the constant pressure tank foundation of the chamber 1 through the base bolts, the water inlet of the constant pressure tank A 31 is connected with the water outlet of the submersible pump in the water sump through a pipeline, a manual gate valve A 2 is installed on the water inlet pipeline of the constant pressure tank A 31 and is close to the water inlet, the water outlet of the constant pressure tank B 32 is connected with one end of the water inlet header 9 through a connecting inclined pipe 5, the other end of the water inlet header 9 is blocked by a blocking structure, the water inlets of the water supply units installed in parallel are connected with the water inlet header 9 through the water inlet branch pipes, the water inlet branch pipes are horizontally installed and are perpendicular to the axis of the water inlet header 9, the water outlets of the water supply units are connected with the water outlet header 10 through the water outlet branch pipes, the water outlet branch pipes are vertically installed and are perpendicular to the axis of the water outlet header 10, and the other end of the water outlet header 10 is connected with the water supply high-pressure nozzles through the branch pipes.

[0020] As a preferred embodiment, the water supply unit comprises a multi-stage pump 6, a variable frequency motor 7 and a base, wherein the multi-stage pump 6 and the variable frequency motor 7 are fixed on the same base, the base is installed on the water supply unit foundation of the chamber 1 through the fixing bolts, the pump shaft of the multi-stage pump 6 is connected with the output shaft of the variable frequency motor 7 through a coupling, the multi-stage pump 6 and the variable frequency motor 7 share a base, which can not only improve the coaxiality between the pump shaft of the multi-stage pump 6 and the main shaft of the variable frequency motor 7, but also reduce the installation and maintenance difficulty of the water supply unit, a protective cover 8 is arranged outside the coupling, the protective cover 8 is installed on the base through the bottom bolts, the protective cover 8 can prevent foreign matter and impurity particles from entering the coupling during the working process of the water supply unit, reduce the risk of damage to the coupling, and also ensure the operation safety of the operator.

[0021] As a preferred embodiment, the water inlet branch pipe comprises a rubber short pipe 14 and a manual gate valve B 15, the rubber short pipe 14 is installed at the water inlet flange of the water supply unit through a flange, the other end of the manual gate valve B 15 is installed at the other end of the rubber short pipe 14 through a bolt, on one hand, the rubber short pipe 14 can adjust the distance between the water inlet of the water supply unit and the water inlet header 9, on the other hand, the rubber short pipe 14 can buffer the fluid medium entering the water supply unit, so as to avoid the impact damage of high-speed fluid medium to the impeller part of the water supply unit, the other end of the manual gate valve B 15 is connected with the water inlet header 9 through a pipeline, the connection between the water inlet branch pipe and the water inlet header 9 is welded, the water inlet amount of the water supply unit can be adjusted through the manual gate valve B 15, and the maintenance of the water supply unit is facilitated.

[0022] As a preferred embodiment, the water outlet branch pipe comprises a water outlet short pipe 11, an electric gate valve 12 and a check valve 13, one end of the water outlet short pipe 11 is fixed at the water outlet flange of the water supply unit through a flange, the other end of the water outlet short pipe 11 is sequentially installed with the electric gate valve 12 and the check valve 13 through a flange connection, when the water supply unit is started, the electric gate valve 12 is closed, and the check valve 13 is opened, when the rotating speed of the frequency conversion motor 7 reaches the set rotating speed, the electric gate valve 12 is opened, when the water supply unit stops working, the check valve 13 is closed, so as to prevent the fluid medium in the water outlet header 10 from flowing back to the water supply unit, and the damage to the water supply unit is avoided, and the other end of the check valve 13 is connected with the water outlet header 10 through a pipeline, the connection between the water outlet branch pipe and the water outlet header 10 is welded.

[0023] As a preferred embodiment, the water outlet header 10 is fixed through a tripod, the tripod is connected to the I-beam at the top of the chamber 1 through an anchor rod, the tripod is arranged at the connection between the water outlet branch pipe of each water supply unit and the water outlet header 10, so that the pressure of the water outlet branch pipe and the water outlet header 10 on the water outlet of the water supply unit is reduced, and the installation and maintenance of the water supply unit are facilitated.

[0024] The parallel multi-stage centrifugal pump constant pressure water supply device, when the device is ready to start, the submersible pump of the water tank is opened by the control unit, the submersible pump of the water tank supplies water to the pressure stabilizing tank A 31 and the pressure stabilizing tank B 32, the internal pressure of the pressure stabilizing tank A 31 and the pressure stabilizing tank B 32 can be adjusted in real time through the pressure regulating valve at the top of the pressure stabilizing tank A 31 and the pressure stabilizing tank B 32, so that the internal pressure of the pressure stabilizing tank A 31 and the pressure stabilizing tank B 32 is always within the set range; when the water level of the pressure stabilizing tank A 31 and the pressure stabilizing tank B 32 reaches the set value, the manual gate valve B 15 is opened, at this time, the fluid medium in the several water supply units installed in parallel is full, the frequency conversion motor 7 and the electric gate valve 12 are opened by the control unit, and the water supply operation is completed.

[0025] The parallel multi-stage centrifugal pump constant pressure water supply device is operated, as shown in FIG. 8.Figure 1 and 2 As shown in the figure, there are four water supply units installed in parallel, the control unit can monitor the water pressure of the high-pressure nozzle of the water demand end and the number of opened high-pressure nozzles in real time, when the water pressure of the high-pressure nozzle of the water demand end decreases or the number of opened high-pressure nozzles increases, the control unit can adjust the rotating speed of the variable frequency motor 7 of the water supply unit or open other water supply units to achieve the purpose of stabilizing the water pressure of the high-pressure nozzle of the water demand end.

[0026] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A parallel multi-stage centrifugal pump constant pressure water supply device, comprising a constant pressure tank A (31), a constant pressure tank B (32), a water supply unit, a water outlet branch pipe, a water inlet branch pipe, a water inlet header (9) and a water outlet header (10), characterized in that: The water supply unit is fixed on the floor of the chamber (1) in a "one" shape, the water tank A (31) and the water tank B (32) are connected in series through the pressure stabilizing connecting pipe (4) and close to the water sump, the water tank A (31) and the water tank B (32) are fixed on the water tank foundation of the chamber (1) through the base bolts, the water inlet of the water tank A (31) is connected with the water outlet of the submersible pump in the water sump through the pipeline, the water inlet of the water tank A (31) is installed with the manual gate valve A (2) and close to the water inlet of the manual gate valve A (2), the water outlet of the water tank B (32) is connected with one end of the water inlet header (9) through the connecting inclined pipe (5), the other end of the water inlet header (9) is blocked by the blocking structure, the water inlets of the plurality of water supply units installed in parallel are connected with the water inlet header (9) through the water inlet branch pipes, the plurality of water inlet branch pipes are installed in a horizontal manner and perpendicular to the axis of the water inlet header (9), the water outlets of the plurality of water supply units are connected with the water outlet header (10) through the water outlet branch pipes, the plurality of water outlet branch pipes are installed in a vertical manner and perpendicular to the axis of the water outlet header (10), the other end of the water outlet header (10) is connected with the water supply high pressure nozzles through the plurality of branch pipes.

2. The parallel multi-stage centrifugal pump constant pressure water supply device according to claim 1, characterized in that: The water supply unit includes a multi-stage pump (6), a variable frequency motor (7) and a base, the multi-stage pump (6) and the variable frequency motor (7) are fixed on the same base, the base is installed on the water supply unit foundation of the chamber (1) through the fixing bolts, the pump shaft of the multi-stage pump (6) is connected with the output shaft of the variable frequency motor (7) through the coupling, the outside of the coupling is provided with a protective cover (8), and the protective cover (8) is installed on the base through the bottom bolts.

3. The parallel multi-stage centrifugal pump constant pressure water supply device according to claim 1, characterized in that: The water inlet branch pipe includes a rubber short connection (14) and a manual gate valve B (15), the rubber short connection (14) is installed on the water inlet flange of the water supply unit through the flange, the manual gate valve B (15) is installed on the other end of the rubber short connection (14) through the bolts, the other end of the manual gate valve B (15) is connected with the water inlet header (9) through the pipeline, and the connection between the water inlet branch pipe and the water inlet header (9) is welded.

4. The parallel multi-stage centrifugal pump constant pressure water supply device according to claim 1, characterized in that: The water outlet branch pipe includes a water outlet short connection (11), an electric gate valve (12) and a check valve (13), one end of the water outlet short connection (11) is fixed on the water outlet flange of the water supply unit through the flange, the other end of the water outlet short connection (11) is installed with the electric gate valve (12) and the check valve (13) in sequence through the flange connection, the other end of the check valve (13) is connected with the water outlet header (10) through the pipeline, and the connection between the water outlet branch pipe and the water outlet header (10) is welded.

5. The parallel multi-stage centrifugal pump constant pressure water supply device according to claim 1, characterized in that: The water outlet header (10) is fixed through a tripod, the tripod is connected to the I-beam on the top of the chamber (1) through anchor rods, and the tripod is arranged at the connection between the water outlet branch pipe of each water supply unit and the water outlet header (10).

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