CN207960823U - A kind of safety-type water drainage system for maintenance with duplicate protection - Google Patents

Abstract

The utility model discloses a kind of safety-type water drainage system for maintenance with duplicate protection, it includes more generating sets (1), and draft tube (2) is respectively connected on every generating set (1)；The bottom end of every draft tube (2) is respectively connected with outlet pipe (3), is connected with branch pipe (4), switch valve (5), check-valves (6) and maintenance water inlet pipe (7) on every outlet pipe (3) in turn；It is connected with artesian water drainage pipe (8) on branch pipe (4), isolating valve (9) is both provided on every branch pipe (4)；The side of the maintenance water inlet pipe (7) is provided with drainage for overhaul pipe (10), it is connected with No.1 drainage arrangement (11) and No. two drainage arrangements (12) between maintenance water inlet pipe (7) and drainage for overhaul pipe (10), No.1 drainage arrangement (11) and No. two drainage arrangements (12) are arranged in parallel.The utility model can not only reduce security risk, also have the advantages that maintenance is convenient, overhaul efficiency is higher, low energy consumption and operation stability is strong.

Description

A Safe Maintenance and Drainage System with Double Protection

technical field

The utility model relates to a drainage system, in particular to a safety maintenance drainage system with double protection.

Background technique

In the draft pipe drainage system of a hydropower station, there are often situations where two or more units are branded tail water at the same time. The existing draft pipe drainage system generally uses multiple centrifugal pumps to discharge a large amount of water in the draft pipe from the maintenance inlet pipe. Then, open the valve of the self-flowing drainage pipe so that local water sources such as leakage water from the gate in the draft pipe flow into the self-flowing drainage pipe through the inspection inlet pipe and discharge, so as to prevent personnel from being injured due to internal water accumulation in the drafting pipe. However, when two or more units of this kind of drainage system discharge tail water at the same time, the tail water of one unit will be drained first, and the tail water in the other units will be recoiled into the unit that drained water first through the maintenance inlet pipe. Cause casualties and equipment damage in the unit, high potential safety hazards; the current solution is: ① multiple units are drained sequentially and then repaired; ② multiple units are drained sequentially and then repaired together, which will make the maintenance more troublesome , and the maintenance efficiency is low. Therefore, the existing drainage system has the problems of high potential safety hazard, troublesome maintenance and low maintenance efficiency.

Utility model content

The purpose of the utility model is to provide a safe maintenance drainage system with double protection. The utility model can not only reduce potential safety hazards, but also has the advantages of convenient maintenance and high maintenance efficiency.

The technical scheme of the utility model: a safety maintenance and drainage system with double protection, including multiple generator sets, each generator set is connected with a draft pipe; the bottom end of each draft pipe is connected with an outlet pipe, each The outlet pipe is connected with branch pipes, switch valves, check valves and maintenance water inlet pipes in turn; the branch pipes are connected with artesian drainage pipes, and each branch pipe is equipped with isolation valves; one side of the maintenance water inlet pipes is provided with maintenance drainage pipes , No. 1 drainage device and No. 2 drainage device are connected between the maintenance water inlet pipe and the maintenance drainage pipe, and the No. 1 drainage device and No. 2 drainage device are arranged in parallel.

In the aforesaid safety maintenance drainage system with double protection, the No. 1 drainage device includes a No. 1 suction pipe, and the No. 1 suction pipe is sequentially connected with a No. 1 normally open manual valve, a large Power centrifugal water pump, No. 1 flow indicator, pressure regulating valve and No. 2 normally open manual valve.

In the aforesaid safety maintenance drainage system with double protection, the No. 2 drainage device includes a No. 2 suction pipe, and the No. 2 suction pipe is sequentially connected with a No. 3 normally open manual valve, a small Power centrifugal water pump, No. 2 flow indicator, slow-closing check valve and No. 4 normally open manual valve.

In the aforementioned double-protection safety maintenance drainage system, a normally closed solenoid valve is connected between the maintenance water inlet pipe and the maintenance drainage pipe.

In the aforesaid double-protected safety inspection and drainage system, a No. 3 flow indicating signal device is installed at a position between the on-off valve and the check valve on the outlet pipe.

Compared with the prior art, the utility model improves the existing drainage system by connecting the bottom end of the draft tube with the maintenance inlet pipe through the outlet pipe, and connecting branch pipes, switch valves and check valves on the outlet pipe once, And the branch pipe is connected with the self-flowing drainage pipe, and an isolation valve is set on the branch pipe, so that the draft pipes on multiple generator sets can drain water at the same time; because the check valve is installed on the outlet pipe, when the water in the draft pipe of one generator set Finally, the water in other draft tubes will not enter the draft tube after the water has been drained; when the water in the draft tube is drained, close the on-off valve and open the isolation valve on the branch pipe, so that the percolation water in the draft tube can flow smoothly. The branch pipe is discharged from the self-flowing drainage pipe to prevent water accumulation in the draft pipe and eliminate the hidden danger of personnel and equipment injury due to water accumulation in the draft pipe; moreover, the draft pipes on multiple generator sets can discharge water at the same time, and each time a group of tail water After the water in the pipe is emptied, the staff can carry out maintenance, which is more convenient for maintenance; multiple draft tubes can be maintained at the same time, and the maintenance efficiency is high. In addition, the No. 1 drainage device of the utility model adopts a high-power centrifugal water pump, and the No. 2 drainage device adopts a low-power centrifugal water pump. Through the combined use of the No. 1 drainage device and the No. 2 drainage device, the water in the draft tube can be pumped out at the same time The No. 1 and No. 2 drainage devices with suitable power are used to cooperate to reduce energy consumption; a pressure regulating valve is installed in the No. 1 drainage device, and a slow-closing check valve is installed in the No. 2 drainage device, which is conducive to the stability of the drainage device operation; by connecting a normally closed solenoid valve between the maintenance inlet pipe and the maintenance drain pipe, when the No. 1 and No. 2 drainage devices need maintenance, the normally closed solenoid valve can be opened to drain water; There is a No. 3 flow indicator at the position between the check valves. When the switch valve is closed, if the No. 3 flow indicator can give an early warning when there is a problem with the switch valve and the check valve, it ensures the safety of personnel in the draft pipe. Safety. Therefore, the utility model can not only reduce potential safety hazards, but also has the advantages of convenient maintenance, high maintenance efficiency, low energy consumption and strong operation stability.

Description of drawings

Fig. 1 is a structural representation of the utility model.

The marks in the accompanying drawings are: 1-generator set, 2-draft pipe, 3-outlet pipe, 4-branch pipe, 5-on-off valve, 6-check valve, 7-overhaul inlet pipe, 8-self-flowing drain pipe, 9 -Isolation valve, 10-Overhaul drain pipe, 11-No. 1 drainage device, 12-No. 2 drainage device, 13-No. 1 suction pipe, 14-No. 1 normally open manual valve, 15-High-power centrifugal water pump, 16-One No. flow signal device, 17-pressure regulating valve, 18-No. 2 normally open manual valve, 19-No. 2 pumping pipe, 20-No. 3 normally open manual valve, 21-No. 2 flow indicating device, 22-low power Centrifugal water pump, 23-slow closing check valve, 24-No. 4 normally open manual valve, 25-normally closed solenoid valve, 26-No. 3 flow indicator.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for limiting the utility model.

Example. A safe inspection and drainage system with double protection, the composition is shown in Figure 1, including multiple generator sets 1, each generator set 1 is connected with a draft pipe 2; the bottom end of each draft pipe 2 is connected with an outlet Water pipe 3, each outlet pipe 3 is sequentially connected with branch pipe 4, switch valve 5, check valve 6 and maintenance water inlet pipe 7; branch pipe 4 is connected with gravity drain pipe 8, and each branch pipe 4 is provided with isolation valve 9 One side of the maintenance water inlet pipe 7 is provided with a maintenance drainage pipe 10, a No. 1 drainage device 11 and a No. 2 drainage device 12 are connected between the maintenance water inlet pipe 7 and the maintenance drainage pipe 10, and No. 1 drainage device 11 and No. 2 drainage The devices 12 are arranged in parallel.

The No. 1 drainage device 11 includes a No. 1 suction pipe 13, and the No. 1 suction pipe 13 is sequentially connected with a No. 1 normally open manual valve 14, a high-power centrifugal water pump 15, and a No. 1 flow indicator from the maintenance water inlet pipe 7 to the maintenance drainage pipe 10. Annunciator 16, pressure regulating valve 17 and No. 2 normally open manual valve 18; said No. 2 drainage device 12 includes No. 2 suction pipe 19, and No. 2 suction pipe 19 is sequentially connected with three No. normally open manual valve 20, small power centrifugal water pump 22, No. 2 flow indicator 21, slow-closing check valve 23 and No. 4 normally open manual valve 24; There is a normally closed solenoid valve 25; the outlet pipe 3 is provided with a No. 3 flow indicator 26 at a position corresponding to the switch valve 5 and the check valve 6.

Working principle: When multiple generator sets 1 need to be repaired and maintained, it is necessary to empty the water in the draft pipe 2 at the bottom of the generator set 1; at this time, open the switch valve 5 on the outlet pipe 3 at the bottom of the draft pipe 2, so that the draft pipe 2 According to the water volume in the draft pipe 2, the No. 1 drainage device 11 and the No. 2 drainage device 12 are opened, that is, the high-power centrifugal water pump 15 and the low-power centrifugal water pump 22 are turned on. ; After the high-power centrifugal water pump 15 is turned on, the water in the maintenance water inlet pipe 7 is drawn into the No. 1 suction pipe 13, and enters the maintenance drain pipe 10 after passing through the No. 1 flow indicator 16 and the pressure regulating valve 17; After the water pump 22 is turned on, the water in the maintenance inlet pipe 7 is drawn into the No. 2 suction pipe 19, and enters into the maintenance drain pipe 10 after passing through the No. 2 flow indicator 21 and the slow-closing check valve 23; Water volume, the No. 1 flow indicator 16 and the No. 2 flow indicator 21 can indirectly reflect the water volume in the draft tube 2, thereby adjusting the start and stop of the high-power centrifugal water pump 15 and the low-power centrifugal water pump 22, thereby saving energy consumption; The pressure regulating valve 17 and the slow-closing check valve 23 help the drainage device to discharge water stably.

When the water in one of the multiple draft pipes 2 is emptied, since the check valve 6 is arranged between the outlet pipe 3 and the inspection inlet pipe 7, the water in the inspection inlet pipe 7 will not flow into other draft pipes. 2 Under the action of water pressure, it flows back into the tail water pipe 2 where the water is drained, and the tail water and artesian percolation water flow into the maintenance water inlet pipe 7 and the artesian drainage pipe 8 respectively, so as to prevent tail water backflow and provide double tail water backflow protection. Simultaneously realize the primary protection; when the water in the draft tube 2 is emptied, the No. 3 flow indicator 26 set between the on-off valve 5 and the check valve 6 can transmit the no flow signal, and then close the outlet pipe at the bottom of the draft tube 2 3, and open the isolation valve 9 on the branch pipe 4, the percolation water in the draft pipe 2 can be discharged into the artesian drainage pipe 8 along the branch pipe 4, thereby preventing water accumulation in the draft pipe 2, and then the staff Enter the draft tube 2 to maintain the generator set 1 and the draft tube 2; the draft tube 2 can be maintained every time a draft tube 2 is emptied, the maintenance efficiency is high, and the staff can complete the maintenance in the draft tube 2 at one time It works, and the control is simple; the No. 3 flow indicator 26 has an early warning function. When the switch valve 5 on the outlet pipe 3 is in the closed state, if the No. 3 flow indicator 26 shows that there is water flow, it indicates that the check valve 6 and the switch If the valve 5 or No. 3 flow indicator 26 is in an abnormal state, the staff in the draft pipe 2 can be notified in time to do the evacuation work, so as to prevent personnel and equipment from being injured and realize double protection.

When No. 1 drainage device 11 and No. 2 drainage device 12 need maintenance, the normally open manual valve 14, No. 2 normally open manual valve 18, No. 3 normally open manual valve 20 and No. 4 normally open manual valve can be opened by closing No. 1 drainage device 11 and No. 2 drainage device 12. 24 to prohibit the water in the maintenance water inlet pipe 7 from entering the maintenance drain pipe 10; at the same time, the water in the maintenance water inlet pipe 7 is directly entered into the maintenance drain pipe 10 by opening the normally closed solenoid valve 25, thereby draining the draft pipe 2.

Claims (5)

1. a kind of safety-type water drainage system for maintenance with duplicate protection, it is characterised in that：Including more generating sets (1), often Draft tube (2) is respectively connected on platform generating set (1)；The bottom end of every draft tube (2) is respectively connected with outlet pipe (3), and every goes out It is connected with branch pipe (4), switch valve (5), check-valves (6) and maintenance water inlet pipe (7) on water pipe (3) in turn；Branch pipe is connected on (4) Artesian water drainage pipe (8) is both provided with isolating valve (9) on every branch pipe (4)；The side of the maintenance water inlet pipe (7) is provided with inspection Drainpipe (10) is repaiied, No.1 drainage arrangement (11) and No. two rows are connected between maintenance water inlet pipe (7) and drainage for overhaul pipe (10) Water installations (12), No.1 drainage arrangement (11) and No. two drainage arrangements (12) are arranged in parallel.

2. a kind of safety-type water drainage system for maintenance with duplicate protection according to claim 1, it is characterised in that：It is described No.1 drainage arrangement (11) includes No.1 drinking-water pipe (13), and No.1 drinking-water pipe (13) is from maintenance water inlet pipe (7) to drainage for overhaul pipe (10) direction is connected with the normally opened hand-operated valve of No.1 (14), high-power centrifugal water pump (15), No.1 in turn and shows stream signalling means (16), adjusts Pressure valve (17) and No. two normally opened hand-operated valves (18).

3. a kind of safety-type water drainage system for maintenance with duplicate protection according to claim 1, it is characterised in that：It is described No. two drainage arrangements (12) include No. two drinking-water pipes (19), and No. two drinking-water pipes (19) are from maintenance water inlet pipe (7) to drainage for overhaul pipe (10) direction be connected in turn No. three normally opened hand-operated valves (20), small-power centrifugal water pump (22), No. two show stream signalling means (21), slow Close check-valves (23) and No. four normally opened hand-operated valves (24).

4. a kind of safety-type water drainage system for maintenance with duplicate protection according to claim 1, it is characterised in that：It is described It is connected with normally closed solenoid valve (25) between maintenance water inlet pipe (7) and drainage for overhaul pipe (10).

5. a kind of safety-type drainage for overhaul system with duplicate protection according to any claim in Claims 1-4 System, it is characterised in that：It is corresponded on the outlet pipe (3) and is provided with No. three at the position between switch valve (5) and check-valves (6) and shows Flow signalling means (26).