CN206368769U - The controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from - Google Patents

Abstract

The utility model relates to a control mechanism for preventing the working seal of a water inlet ball valve of a generator set from automatically exiting, comprising a main operating valve connected with a pressure cut-off valve and an inspection sealing lock valve, the main operating valve is connected with a servomotor device and a closing valve , the closing valve is connected to the opening valve through the emergency closing valve, the mechanical signal overspeed valve, and the opening valve is connected to the inspection sealing locking valve through the working sealing locking valve, which is located between the working sealing locking valve and the inspection sealing locking valve There is a flat pressure control valve connected in parallel with the bypass needle valve. The bypass needle valve is set on the bypass pipeline. An inspection needle valve is installed on the bypass pipeline. The inspection needle valve is connected with the opening control valve. The water inlet ball valve The maintenance sealing connection of the working sealing control valve is connected with the maintenance sealing control valve, and the working sealing control valve and the maintenance sealing control valve are respectively connected with the working maintenance sealing locking valve controlled by the servomotor device. It can ensure the safe and reliable operation of the generator set and the water inlet ball valve system.

Description

The control mechanism to prevent the working seal of the water inlet ball valve of the generator set from automatically exiting

technical field

The utility model relates to a control mechanism for preventing the working seal of a water inlet ball valve of a generator set from automatically withdrawing.

Background technique

The ball valve used in the hydro-generator set is equipped with two parts, the working seal and the maintenance seal. The working seal refers to the seal on the downstream side of the ball valve body, and the maintenance seal refers to the seal on the upstream side of the ball valve body. There are two cavities, called the input cavity and the exit cavity. When the working seal is put into operation, pressurized water is put into the cavity, pressure is relieved through the drain pipe when the cavity is withdrawn, and the operation sealing action is put into operation; The principle of maintenance seal is the same as that of working seal.

When the hydro-generator set is shut down in a steady state, it will be found that the ball valve installed on the water flow channel is out of work and sealed, but checking the event records, there is no command to open the ball valve, and the working bypass valve installed on the water flow channel is also fully closed. However, the working seal lock valve on the ball valve control mechanism is indeed in the withdrawal position, and a loud water leakage sound can be heard at the working seal. Further inspection shows that the pressure gauge of the ball valve working seal lock valve input cavity shows 0. For this reason, a control mechanism that prevents the working seal of the water inlet ball valve of the generator set from withdrawing automatically is needed.

Contents of the invention

The purpose of the utility model is to provide a control mechanism for preventing the automatic withdrawal of the working seal of the water inlet ball valve of the generator set, which not only has a compact structure, but also effectively ensures that the working seal does not automatically withdraw from it, and ensures the safe and reliable operation of the generator set and the water inlet ball valve system.

The technical solution of the utility model is: a control mechanism for preventing the working seal of the water inlet ball valve of the generator set from automatically exiting, including a main operating valve and an inspection sealing lock valve respectively connected with the pressure cut-off valve, and the main operating valve is respectively connected with the pressure cut-off valve. The servomotor device is connected to the closing valve, the closing valve is connected to the opening valve through the emergency closing valve, the mechanical signal overspeed valve in turn, and the opening valve is connected to the maintenance sealing locking valve through the working sealing locking valve, located at A flat pressure control valve connected to a bypass needle valve is connected in parallel between the working sealing lock valve and the maintenance sealing lock valve, and the bypass needle valve is set at one end connected to the downstream of the water inlet ball valve and the other end is connected to the water inlet valve. On the bypass pipeline upstream of the ball valve, there is also an inspection needle valve on the bypass pipeline near the upstream side of the water inlet ball valve. The control bypass needle valve is connected with the opening control valve of the maintenance needle valve, the maintenance sealing connection of the water inlet ball valve is connected with the working sealing control valve for controlling the working sealing lock valve, and the working sealing connection of the water inlet ball valve is used for controlling the maintenance The inspection sealing control valve of the sealing lock valve, the working sealing control valve and the inspection sealing control valve are respectively connected with the working inspection sealing locking valve controlled by the servomotor device; the working inspection sealing locking valve, the working sealing control valve The valve and the maintenance sealing control valve are respectively connected with the drain pipe through pipelines, and the working maintenance sealing locking valve is also provided with a pipeline connected with the maintenance needle valve.

Further, one end of the pressure cut-off valve is connected to the pressure oil tank of the hydraulic device, and the other end of the pressure cut-off valve is respectively connected to the main operating valve and the inspection sealing lock valve through the oil filter.

Further, the main operating valve, closing valve, emergency closing valve and mechanical signal overspeed valve are respectively connected to the oil return tank of the pressure device, and the opening chamber of the mechanical signal overspeed valve is connected to the pressure oil tank of the mechanical overspeed device.

Further, the work inspection sealing lock valve is connected to the upper part of a sand settling tank through a water filter, and the lower part of the sand settling tank is provided with a water inlet pipeline connected to the upstream of the water inlet ball valve,

Further, the closing cavity of the main operating valve is connected to the pressure cut-off valve through a pipeline, and the opening cavity of the main operating valve is connected to the closing valve through a pipeline.

Compared with the prior art, the present invention has the following advantages: not only is the structure compact, but also effectively ensures that the working seal will no longer automatically exit, ensuring the safe and reliable operation of the generator set and the water inlet ball valve system. When the water inlet ball valve is fully closed, the leaking oil can be removed in time and effectively, so that the phenomenon of automatic withdrawal of the water inlet ball valve's working seal will no longer occur. At the same time, the control system of the water inlet ball valve is simplified, and the opening and closing time of the water inlet ball valve is shortened, and the switching time of the working condition of the unit is shortened, which can make the unit respond to the demand of the power grid more quickly and ensure the safe and stable operation of the power grid.

Description of drawings

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

detailed description

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific examples are given together with the accompanying drawings and described in detail as follows, but the present invention is not limited thereto.

Refer to Figure 1

A control mechanism that prevents the working seal of the water inlet ball valve of a generator set from automatically withdrawing, including a main operating valve HV01 and an inspection sealing lock valve HV05 respectively connected to the pressure cut-off valve SV09, and the main operating valve is respectively connected to the servomotor device 1 and The closing valve SV03 is connected, and the servomotor device is composed of two servomotors. The closing valve is connected to the opening valve SV02 through the emergency closing valve SV01, the mechanical signal overspeed valve HV02 in sequence, and the opening valve is connected through the working seal lock The closing valve HV04 is connected with the maintenance sealing lock valve HV05, and is located between the working sealing lock valve and the inspection sealing lock valve and is connected in parallel with the flat pressure control valve SV05 connected with the bypass needle valve 2, the bypass needle valve It is installed on the bypass pipeline 10 that one end is connected to the downstream of the water inlet ball valve and the other end is connected to the upstream of the water inlet ball valve. An inspection needle valve 3 is also arranged on the side near the upstream of the water inlet ball valve on the bypass pipeline. The inspection needle valve It is connected with the opening control valve SV08, which is connected in parallel between the working seal lock valve and the inspection seal lock valve, for controlling the bypass needle valve and the inspection needle valve. The working sealing control valve SV04 of the blocking valve is connected with the working sealing control valve V503 of the water inlet ball valve to control the inspection and sealing locking valve. The working sealing control valve and the inspection sealing control valve are respectively controlled by the servomotor The working inspection sealing lock valve HV07 is connected, and the servomotor device is connected with the opening chamber of the working inspection sealing locking valve HV07 through the locking pipeline 11; the working inspection sealing locking valve, the working sealing control valve and the inspection sealing control valve The valves are respectively connected with the drain pipes through the pipelines, and the working maintenance sealing lock valve is also provided with pipelines connected with the maintenance needle valves. The work inspection sealing lock valve is a two-position four-way reversing valve whose opening end is connected to the opening cavity of the servomotor device through a pipeline.

In this embodiment, the main operating valve, closing valve, emergency closing valve, mechanical signal overspeed valve, opening valve and flat pressure control valve are respectively two-position four-way reversing valves. The working seal lock valve and inspection seal lock valve are 2-position 2-way solenoid valves, the pressure cut-off valve is 2-position 2-way reversing valve, and the maintenance sealing control valve is 2-position 4-way manual reversing valve , the working sealing control valve is a two-position four-way double electric reversing valve, the opening control valve is a two-position four-way double electric reversing valve and the oil return port of the parallel station of the opening control valve is connected to the oil tank, and the opening control The oil inlet of the parallel station of the valve is connected with the opening cavity of the maintenance needle valve through the pipeline. The mechanical overspeed signal valve is a pilot valve.

In this embodiment, one end of the pressure cut-off valve is connected to the pressure oil tank 7 of the oil pressure device, and is driven by the pressure oil tank of the oil pressure device. connected to the shut-off valve. The oil inlet of the main operating valve is connected to the pressure cut-off valve through the oil filter 4, the oil return port of the main operating valve is connected to the oil return tank 5 of the oil pressure device, and the A port of the main operating valve is often opened and the valve V6 and The opening chamber of the servomotor device is connected, the B port of the main operating valve is always open, and the valve V7 is connected with the closing chamber of the servomotor device. The opening chamber of the main operating valve is connected with the closing valve through the pipeline, and the opening chamber of the main operating valve is The pipeline with the regulating valve is connected to its A port, the pipeline with the regulating valve is always open and the valve V5 is connected to the pressure gauge P102, and the pipeline with the regulating valve is connected to the closed valve. The closing cavity of the main operating valve is connected with the oil inlet through the pipeline.

In this embodiment, the oil inlet and outlet of the oil filter are respectively provided with normally open valves V1 and V2, and the oil outlet of the oil filter is also connected with a pressure gauge P101 with a constant open valve V3.

In this embodiment, the main operating valve, closing valve, emergency closing valve and mechanical signal overspeed valve are respectively connected to the pressure device return tank 5, and the opening cavity of the mechanical signal overspeed valve is connected to the pressure oil tank of the mechanical overspeed device. connected to drive the mechanical signal overspeed valve. The oil outlet of the flat pressure station of the flat pressure control valve is connected with the oil return.

In this embodiment, the water outlet of the parallel station of the working sealing control valve and the water return port of the parallel station of the working maintenance sealing lock valve are respectively connected to the drain pipe 8 through pipelines, and the cross station of the maintenance sealing control valve Port B is connected to the drain pipe through the pipeline, and port A of the cross station of the inspection and maintenance sealing control valve is often opened.

In this embodiment, the water inlet of the parallel station of the work maintenance sealing lock valve is connected to the water filter 12 through the pipeline provided with the normally open valve V8, and the water filter is connected to the sand settling tank with the normally open valve V23. 13, the lower part of the sand settling tank is provided with a water inlet pipeline connected to the upstream of the water inlet ball valve with a normally open valve V9, and the lower part of the sand settling tank is also provided with a normally closed valve V32 connected to the drain pipe. Connected tubing.

In this embodiment, the lower side of the maintenance seal of the water inlet ball valve is also provided with pipelines connecting the normally closed valves V24, V25 and V26 to the drain pipe, and the lower side of the water inlet ball valve is also provided with a normally closed valve V27 , V28, V29 are connected to the drain pipe.

In this embodiment, the water inlet ball valve is also provided with a differential pressure relay 9, one end of the differential pressure relay is connected to the upstream of the water inlet ball valve through a pipeline with a normally open valve V10, and the one end is also provided with There is a normally open valve V13, which is connected to the pressure gauge P1501; the other end of the differential pressure relay is connected to the downstream of the water inlet ball valve through the pipeline with the normally open valve V11, and the other end is also set A normally open valve V18, the normally open valve V18 is connected to the pressure gauge P1502.

In this embodiment, the closing chamber of the main operating valve is connected to the pressure cut-off valve through the pipeline and the oil filter, and the opening chamber of the main operating valve is connected to the closing valve through the pipeline.

In this embodiment, the pipeline connecting the working maintenance sealing lock valve and the maintenance needle valve is set on the pipeline between the normally open valve V8 and the water filter, and the working maintenance sealing locking valve is connected to the maintenance needle valve. A normally open valve V22 is arranged on the connected pipeline, and the closing cavity of the maintenance needle valve is connected to the oil outlet of the parallel station of the opening control valve through the oil pipeline.

In this embodiment, the input cavity of the maintenance seal of the water inlet ball valve is connected to the normally open valve V19 and is connected to the maintenance seal control valve, and the normally open valve V20 of the maintenance seal release chamber is connected to the maintenance seal control valve. The input chamber is always open valve V12 is connected with the working sealing control valve, and the working sealing withdrawal chamber is often open valve V21 is connected with the working sealing control valve (as shown in Figure 1).

A small amount of oil leakage from the piston of the servomotor device is allowed and unavoidable. Therefore, effective measures must be taken to remove the pressure oil in the closed chamber of the servomotor device that leaks from the piston to the open chamber in time to avoid oil pressure after a long period of accumulation. Elevation makes the spool of the work maintenance sealing lock valve HV07 move to the left, so as to avoid cutting off the sealing operation water and ensure the reliable operation of the sealing for a long time.

Considering that the ball valve is equipped with a pressure cut-off valve SV09, which is closed when the unit is in a steady state, it cuts off the oil circuit to prevent the ball valve from malfunctioning, that is, when the ball valve is fully closed, the opening chamber of the servomotor device directly drains oil through the oil collection tank to ensure timely leakage of oil. discharge.

The working principle of the control mechanism:

(1) Opening control of water inlet ball valve:

1) When the monitoring system issues an instruction to open the water inlet ball valve, open the pressure shut-off valve, and the right side of the pressure shut-off valve SV09 is energized to open the pressure shut-off valve, so that the pressure oil source in the pressure oil tank of the hydraulic device is connected with the hydraulic system, and through The flat pressure control valve SV05 gets the electric excitation and goes to the cross station to open the bypass needle valve;

2) Open the control valve SV08 at the parallel station during normal start-up and shutdown. Both the inspection needle valve and the bypass needle valve are in the fully open position. Only the inspection needle valve is closed during inspection. When the upstream and downstream of the water inlet ball valve are flat-pressed, the exit side (right side) of the work-sealed control valve SV04 is driven to be energized and moved to the cross station, so that the work-sealed exit cavity of the water-inlet ball valve is connected Pressure water, the work-sealed input cavity is connected to the drain pipe; since the sealing operation water that provides the pressure water is taken from the upstream of the water inlet ball valve, the sealing operation water from the upstream of the water inlet ball valve passes through the parallel station of the working maintenance sealing lock valve HV07 The rear water inlet ball valve withdraws from the working seal;

3) During the normal start-up and shutdown process, the maintenance seal control valve V503 is in the cross position, the maintenance seal of the water inlet polo is in the exit position, and the working maintenance seal lock valve HV07 is locked by the hydraulic pressure of the opening chamber of the servomotor device, and the valve is closed by the servomotor. The oil pressure in the opening chamber of the device locks the work maintenance sealing lock valve HV07 to prevent sealing misoperation after the ball valve is opened;

4) When the working seal lock valve HV04 exits the lock position, the open valve SV02 is energized to go to the cross position, and the pressure oil from the hydraulic system passes through the open position of the seal lock valve HV05 (left side spool) , the opening position of the working sealing lock valve HV04 (the left spool), the parallel position of the mechanical overspeed signal valve HV02 (the left spool), the parallel position of the emergency closing valve SV01 (the left spool), the closing The parallel station (spool on the right) of valve SV03 reaches the opening chamber of the main operating valve HV01. At this time, both the opening chamber and the closing chamber of the main operating valve HV01 are connected with pressure oil. Due to the large action area of the opening chamber, the main operating valve HV01 The spool is pushed to the left to move away from the parallel station, the opening chamber of the servomotor device passes pressure oil, and the closing chamber passes back to the oil tank, thereby opening the water inlet ball valve;

5) Through the opening cavity of the servomotor device, pressurized oil is passed through the locking pipeline 11, so that the working inspection and sealing locking valve HV07 goes to the cross station to complete the locking work, so that the inlet and outlet ball valves work and seal the input cavity, the exit cavity, and the maintenance and sealing Both the input cavity and the exit cavity are drained and pressure relieved to prevent sealing misoperation;

6) When the water inlet ball valve is fully opened, make the flat pressure control SV05 de-energize and go to the parallel station to close the bypass needle valve. When the bypass needle valve is fully closed, the process of opening the water inlet ball valve is completed;

(2) Closing control of water inlet ball valve:

1) When the monitoring system issues a ball valve closing order, the flat pressure control valve SV05 is energized and moves to the cross station to open the bypass needle valve;

2) After the bypass needle valve is fully opened, the closed valve SV03 is energized to go to the cross station, and the opening chamber of the main operating valve HV01 is connected to the oil tank. Since the closing chamber of the main operating valve HV01 is always connected to the pressure oil, at this time The spool of the main operating valve HV01 is moved to the right to move to the cross position, the opening cavity of the servomotor device is connected to oil discharge, the closed cavity is connected to pressure oil to close the water inlet ball valve,

3) When the water inlet ball valve is fully closed, the input side of the working sealing control valve SV04 is energized and moved to the parallel station to put the water inlet ball valve into working sealing;

4) When the working seal of the water inlet ball valve is turned on, make the flat pressure control valve SV05 de-energize and go to the parallel station to close the bypass needle valve;

5) When the bypass needle valve is fully closed, the left side of the pressure cut-off valve SV09 is energized, and the pressure cut-off valve is closed to cut off the pressure oil source in the pressure oil tank of the hydraulic device and the hydraulic system, and then the water inlet ball valve is closed. complete.

The above descriptions are only preferred embodiments of the present utility model, and all equivalent changes and modifications made according to the patent scope of the present utility model shall fall within the scope of the present utility model.

Claims (5)

1. A control mechanism that prevents the working seal of the water inlet ball valve of the generator set from automatically withdrawing, comprising a main operating valve and an inspection sealing lock valve respectively connected to the pressure cut-off valve, characterized in that the main operating valve is connected to the servomotor respectively The device is connected to the closing valve, the closing valve is connected to the opening valve through the accident closing valve, the mechanical signal overspeed valve in turn, and the opening valve is connected to the maintenance sealing locking valve through the working sealing locking valve, located in the working sealing A flat pressure control valve connected to a bypass needle valve is connected in parallel between the lockout valve and the inspection seal lock valve, and the bypass needle valve is arranged at one end connected to the downstream of the water inlet ball valve and the other end is connected to the upstream of the water inlet ball valve On the bypass pipeline, there is also an inspection needle valve on the upstream side of the bypass pipeline near the water inlet ball valve. The inspection needle valve is connected in parallel with the valve for controlling the bypass The through needle valve is connected with the opening control valve of the maintenance needle valve, the maintenance sealing connection of the water inlet ball valve is connected with a working sealing control valve for controlling the working sealing lock valve, and the working sealing connection of the water inlet ball valve is connected with a working sealing control valve for controlling the maintenance sealing lock The maintenance sealing control valve of closed valve, the working sealing control valve and the maintenance sealing control valve are respectively connected with the working maintenance sealing locking valve controlled by the servomotor device; the working maintenance sealing locking valve, working sealing control valve and The maintenance sealing control valves are respectively connected with the drain pipes through pipelines, and the working maintenance sealing locking valves are also provided with pipelines connected with the maintenance needle valves. 2. The control mechanism for preventing the automatic withdrawal of the working seal of the water inlet ball valve of the generator set according to claim 1, wherein one end of the pressure cut-off valve is connected to the pressure oil tank of the hydraulic device, and the other end of the pressure cut-off valve The oil filter is respectively connected with the main operation valve and the maintenance sealing lock valve. 3. The control mechanism for preventing the working seal of the water inlet ball valve of the generator set from automatically exiting according to claim 1 or 2, characterized in that the main operating valve, closing valve, emergency closing valve and mechanical signal overspeed valve are respectively connected with the pressure The device is connected to the oil tank, and the opening chamber of the mechanical signal overspeed valve is connected to the pressure oil tank of the mechanical overspeed device. 4. The control mechanism for preventing the automatic withdrawal of the working seal of the water inlet ball valve of the generator set according to claim 3, wherein the working maintenance sealing lock valve is connected with the upper part of a sand settling tank through a water filter, so that The lower part of the sand settling tank is provided with a water inlet pipeline connected to the upstream of the water inlet ball valve. 5. According to claim 1, 2 or 4, the control mechanism for preventing the working seal of the water inlet ball valve of the generator set from automatically withdrawing is characterized in that the closing cavity of the main operation valve is connected with the pressure cut-off valve through the pipeline, and the main operation The opening chamber of the valve is connected with the closing valve through the pipeline.