Double-valve control structure of large water pump

Abstract

A double-valve control structure of a large water pump comprises a large circulating water pump, a circulating water pump inlet valve is arranged on an inlet pipeline of the large circulating water pump, and a circulating water pump outlet valve is arranged on an outlet pipeline of the large circulating water pump. A circulating water pump outlet pressure transmitter and a circulating water pump downstream pipeline pressure transmitter are respectively arranged on the large circulating water pump outlet pipeline on the two sides of the circulating water pump outlet valve; the circulating water pump inlet valve, the circulating water pump outlet valve, the circulating water pump outlet pressure transmitter and the circulating water pump downstream pipeline pressure transmitter are all connected to the DCS centralized control system. By the adoption of the structure, a traditional circulating water pump outlet check valve is omitted, pump outlet resistance is reduced, device energy consumption is reduced, the water hammer phenomenon is eliminated, and in addition, the purposes of one-key starting, stopping and monitoring of the large-scale circulating water pump are achieved remotely through the DCS centralized control system.

Description

Technical Field

[0001] The utility model relates to the technical field of water conveyance, and specifically to a double-valve control structure for a large water pump. Background Art

[0002] At present, large circulating water pumps are not only equipped with inlet and outlet manual valves, but also a check valve is provided at the pump outlet to prevent the liquid at the pump outlet from flowing back into the pump and causing the pump to reverse, so as to ensure the safety of the pump in case of failure. However, generally, the resistance loss of the check valve is relatively large, basically reaching 5% - 10% of the pump flow rate. For large water pumps, the energy loss caused by the check valve is huge. In the pipeline system of large water pumps, the water hammer generated when starting and stopping the pump has great destructive power. If the check valve is not properly selected, it will damage the pipeline and equipment. In addition, manual valves are used for the inlet and outlet of large circulating water pumps, which requires on-site operation by operators, consuming time and effort, and sometimes special tools are also needed. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a double-valve control structure for a large water pump, which reduces the resistance at the pump outlet, lowers the energy consumption of the device, eliminates the water hammer phenomenon by canceling the traditional check valve at the pump outlet, and remotely realizes the one-key start-stop and monitoring of the large circulating water pump by relying on the DCS centralized control system.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a double-valve control structure for a large water pump, including a large circulating water pump, a circulating water pump inlet valve is provided on the inlet pipeline of the large circulating water pump, and a circulating water pump outlet valve is provided on the outlet pipeline of the large circulating water pump;

[0005] On the outlet pipeline of the large circulating water pump on both sides of the circulating water pump outlet valve, a circulating water pump outlet pressure transmitter and a downstream pipeline pressure transmitter of the circulating water pump are respectively provided;

[0006] The circulating water pump inlet valve, the circulating water pump outlet valve, the circulating water pump outlet pressure transmitter and the downstream pipeline pressure transmitter of the circulating water pump are all connected to the DCS centralized control system.

[0007] In a preferred solution, the circulating water pump inlet valve and the circulating water pump outlet valve adopt electric control or hydraulic control butterfly valves.

[0008] In a preferred solution, a water hammer elimination tank is further provided on the outlet pipeline of the large circulating water pump, and the water hammer elimination tank is arranged on the pipeline between the circulating water pump outlet valve and the circulating water pump outlet pressure transmitter.

[0009] In a preferred solution, the bottom of the water hammer elimination tank is connected to the outlet pipeline of the large circulating water pump, and a water storage bladder is arranged inside the water hammer elimination tank, and the inner cavity of the water storage bladder is communicated with the outlet pipeline of the large circulating water pump;

[0010] Above the water storage bladder bag, there is a piston plate inside the water hammer eliminator tank.

[0011] In a preferred embodiment, a vertical guide rod is provided at the top of the piston plate. The upper end of the guide rod passes through the top surface of the water hammer eliminator tank, and a spring is sleeved on the guide rod located inside the water hammer eliminator tank.

[0012] In a preferred embodiment, the outer wall of the guide rod is provided with a threaded end, and an adjustable pressing plate with a threaded hole is provided on the threaded section. The upper end of the spring contacts the bottom surface of the adjustable pressing plate.

[0013] A double-valve control structure for a large water pump provided by the present utility model has the following beneficial effects by adopting the above structure:

[0014] (1) The traditional check valve at the outlet of the circulating water pump is cancelled, the water hammer phenomenon during the start and stop operations of the pump is eliminated, the energy consumption of the device is reduced, and the long-term stable operation of the large circulating water pump is realized;

[0015] (2) The DCS centralized control system is adopted, and the opening and closing of the valves and the operation of the circulating water pump motor are remotely controlled and monitored by the control system, realizing the one-key start and stop of the large circulating water pump;

[0016] (3) Through the adjustable water hammer elimination mechanism, the impact force of the high-pressure water hammer wave can be buffered according to the water pressure situation in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0018] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0019] Figure 2 It is a schematic diagram of the structure of the water hammer eliminator tank of the present utility model.

[0020] In the figure: large circulating water pump 1, DCS centralized control system 2, circulating water pump inlet valve 3, circulating water pump outlet valve 4, circulating water pump outlet pressure transmitter 5, circulating water pump downstream pipeline pressure transmitter 6, water hammer eliminator tank 7, water storage bladder bag 8, piston plate 9, guide rod 10, adjustable pressing plate 11, spring 12. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] As Figure 1 shown in [figure reference], a double-valve control structure for a large water pump includes a large circulating water pump 1. A circulating water pump inlet valve 3 is provided on the inlet pipeline of the large circulating water pump 1, and a circulating water pump outlet valve 4 is provided on the outlet pipeline of the large circulating water pump 1;

[0022] On the outlet pipelines of the large - scale circulating water pump 1 on both sides of the circulating water pump outlet valve 4, a circulating water pump outlet pressure transmitter 5 and a downstream pipeline pressure transmitter 6 of the circulating water pump are respectively provided.

[0023] The circulating water pump inlet valve 3, the circulating water pump outlet valve 4, the circulating water pump outlet pressure transmitter 5 and the downstream pipeline pressure transmitter 6 of the circulating water pump are all connected to the DCS centralized control system 2.

[0024] In a preferred solution, the circulating water pump inlet valve 3 and the circulating water pump outlet valve 4 adopt electric control butterfly valves.

[0025] In a preferred solution, a water hammer eliminator tank 7 is further provided on the outlet pipeline of the large - scale circulating water pump 1, and the water hammer eliminator tank 7 is arranged on the pipeline between the circulating water pump outlet valve 4 and the circulating water pump outlet pressure transmitter 5.

[0026] In a preferred solution, the bottom of the water hammer eliminator tank 7 is connected to the outlet pipeline of the large - scale circulating water pump 1, and a water storage bladder 8 is arranged inside the water hammer eliminator tank 7, and the inner cavity of the water storage bladder 8 is communicated with the outlet pipeline of the large - scale circulating water pump 1.

[0027] A piston plate 9 is arranged inside the water hammer eliminator tank 7 above the water storage bladder 8.

[0028] In a preferred solution, a vertical guide rod 10 is arranged at the top of the piston plate 9, the upper end of the guide rod 10 passes through the top surface of the water hammer eliminator tank 7, and a spring 12 is sleeved on the guide rod 10 located inside the water hammer eliminator tank 7.

[0029] In a preferred solution, the outer wall of the guide rod 10 is provided with a threaded section, and an adjustable pressing plate 11 with a threaded hole is arranged on the threaded section, and the upper end of the spring 12 contacts the bottom surface of the adjustable pressing plate 11.

[0030] The DCS centralized control system 2 remotely controls the opening and closing of the circulating water pump inlet valve 3 and the circulating water pump outlet valve 4 and the start and stop of the driving motor of the large - scale circulating water pump 1. The opening and closing signals of the circulating water pump inlet valve 3 and the circulating water pump outlet valve 4 and the operating signals of the circulating water pump outlet pressure transmitter 5, the downstream pipeline pressure transmitter 6 of the circulating water pump and the large - scale circulating water pump 1 are transmitted to the DCS centralized control system 2.

[0031] When the DCS centralized control system 2 issues a "pump start" command, the circulating water pump inlet valve 3 is remotely and automatically opened, the motor of the large - scale circulating water pump 1 is automatically started, and when the pump outlet pressure is higher than the pipeline pressure, the circulating water pump outlet valve 4 is remotely and automatically opened.

[0032] When the DCS centralized control system 2 executes a "pump stop" command, the circulating water pump outlet valve 4 is remotely and automatically closed, and the motor of the large - scale circulating water pump 1 automatically stops running.

[0033] When the circulating water pump fails and stops running, the outlet valve 4 of the circulating water pump closes remotely and automatically.

[0034] When it is detected that the circulating water pump has stopped running and the outlet valve of the circulating water pump has not closed for one minute, the inlet valve 3 of the circulating water pump closes remotely and automatically.

[0035] In addition, for the water hammer phenomenon that may occur after the outlet valve 4 of the circulating water pump is closed, during the process of pipeline water supply, the position of the adjustable pressing plate 11 can be adjusted in advance by rotating the guide rod 10, so as to adjust the distance between the adjustable pressing plate 11 and the piston plate 9, and further adjust the compression amount of the spring 12. When water hammer occurs, the elastic force of the spring 12 injects the water in the water hammer elimination tank 7 into the pipeline and impacts with the high-pressure water hammer wave oscillating back and forth to buffer the impact force of the high-pressure water hammer wave. Subsequently, the kinetic energy of the high-pressure water hammer wave rushes into the water hammer elimination tank 7 again, and the water hammer elimination tank 7 fills with water and expands, pushing the piston plate 9, causing the spring 12 to be compressed again, further buffering the impact force of the high-pressure water hammer wave.

[0036] Preferably, the inlet valve 3 and the outlet valve 4 of the circulating water pump preferably adopt hydraulically or motor-driven butterfly valves that can be remotely and automatically controlled, are provided with valve position detection devices, can realize rapid opening or closing of the valves, close from 100% to 70% in 30 s and from 70% to 0 in 15 s, prevent water hammer from occurring, or prevent a large amount of water from flowing back and causing the pump to reverse. The valve opening and closing signals and valve position signals are transmitted to the DCS centralized control system 2, and can be remotely controlled in the DCS control room.

Claims

1. A double-valve control structure for a large water pump, characterized in that: It includes a large circulating water pump (1). A circulating water pump inlet valve (3) is provided on the inlet pipeline of the large circulating water pump (1), and a circulating water pump outlet valve (4) is provided on the outlet pipeline of the large circulating water pump (1). On the outlet pipeline of the large circulating water pump (1) on both sides of the circulating water pump outlet valve (4), a circulating water pump outlet pressure transmitter (5) and a downstream pipeline pressure transmitter of the circulating water pump (6) are respectively provided. The circulating water pump inlet valve (3), the circulating water pump outlet valve (4), the circulating water pump outlet pressure transmitter (5) and the downstream pipeline pressure transmitter of the circulating water pump (6) are all connected to the DCS centralized control system (2).

2. The dual-valve control structure of a large water pump according to claim 1, characterized in that: The circulating water pump inlet valve (3) and the circulating water pump outlet valve (4) adopt electric control butterfly valves.

3. The double-valve control structure of a large water pump according to claim 1, characterized in that: A water hammer elimination tank (7) is further provided on the outlet pipeline of the large circulating water pump (1). The water hammer elimination tank (7) is arranged on the pipeline between the circulating water pump outlet valve (4) and the circulating water pump outlet pressure transmitter (5).

4. The dual-valve control structure of a large water pump according to claim 3, characterized in that: The bottom of the water hammer elimination tank (7) is connected to the outlet pipeline of the large circulating water pump (1). A water storage bladder (8) is arranged inside the water hammer elimination tank (7), and the inner cavity of the water storage bladder (8) is communicated with the outlet pipeline of the large circulating water pump (1). A piston plate (9) is arranged inside the water hammer elimination tank (7) above the water storage bladder (8).

5. The dual-valve control structure of a large water pump according to claim 4, characterized in that: A vertical guide rod (10) is provided at the top of the piston plate (9). The upper end of the guide rod (10) penetrates outside the top surface of the water hammer elimination tank (7). A spring (12) is sleeved on the guide rod (10) located inside the water hammer elimination tank (7).

6. The double-valve control structure of a large water pump according to claim 5, characterized in that: A threaded end is provided on the outer wall of the guide rod (10). An adjustable pressing plate (11) with a threaded hole is arranged on the threaded section. The upper end of the spring (12) contacts the bottom surface of the adjustable pressing plate (11).

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