CN111473012A

CN111473012A - Four-taking two-speed shutdown control device

Info

Publication number: CN111473012A
Application number: CN202010200546.7A
Authority: CN
Inventors: 蒋建业; 倪成良; 胡爱军; 郭丹琪; 沈国杭; 严懿翔; 张世方
Original assignee: Zhejiang Huayuan Steam Turbine Machinery Co ltd; Hangzhou Steam Turbine Machinery Equipment Co Ltd
Current assignee: Zhejiang Huayuan Steam Turbine Machinery Co ltd; Hangzhou Steam Turbine Machinery Equipment Co Ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-07-31

Abstract

The invention provides a four-taking two-speed shutdown control device which comprises a main control module, a first shutdown control module and a second shutdown control module, wherein the first shutdown control module and the second shutdown control module are respectively arranged at the left side and the right side of the main control module and are communicated through a first oil conveying pipe and a second oil conveying pipe which are externally connected; the main control module comprises a main control module body, a starting oil control valve, a quick closing oil control valve, a first unloading cartridge valve, a second unloading cartridge valve and a third unloading cartridge valve; the first shutdown control module comprises a first shutdown control module body, a first shutdown electromagnetic valve, a second shutdown electromagnetic valve, a first cartridge valve and a second cartridge valve, and the second shutdown control module comprises a second shutdown control module body, a third shutdown electromagnetic valve, a fourth shutdown electromagnetic valve, a third cartridge valve and a fourth cartridge valve; on the premise of ensuring low false tripping probability, the structure of the shutdown quick-closing valve group is simplified, and the upgrading and reconstruction cost is low.

Description

Four-taking two-speed shutdown control device

Technical Field

The invention relates to a control device of a main throttle valve of a steam turbine, in particular to a four-taking two-speed shutdown control device.

Background

The steam turbine is a rotary steam power device, high-temperature and high-pressure steam passes through a fixed nozzle to become accelerated airflow and then is sprayed onto blades, so that a rotor provided with blade rows rotates, and simultaneously, the rotor does work outwards. Steam turbines are the main equipment of modern thermal power plants, are also used in metallurgical industry, chemical industry and ship power plants, along with the continuous progress of scientific technology, the mechatronic process is more and more developed, and the steam turbines are also continuously researched, developed and popularized as one of important machines for providing prime power.

The main steam inlet loop of the steam turbine is controlled by a quick closing control system, the quick closing control system is generally formed by connecting a plurality of independent hydraulic control parts through pipelines, so that the steam turbine has various pipelines and complex installation, is difficult to monitor in operation and is easy to generate oil leakage and ignition accidents, meanwhile, a general quick closing control device for the steam turbine usually adopts two stop electromagnetic valve structures to realize the remote stop function of the steam turbine unit, the control logic is one of two, and any one or more stop electromagnetic valves can cause unit tripping when the steam turbine normally operates. According to the control logic design of one out of two, the steam turbine trip can be caused by the fault of any instrument shutdown signal channel (signal interference or control system clamping part fault and the like) or the fault of any shutdown electromagnetic valve, serious hidden danger is brought to the normal safe operation of the whole unit, the smoothness of the control channel and the effective use of the electromagnetic valve are ensured at any moment during the operation of the unit, periodic maintenance and manual inspection of the on-site quick-closing control device are required to be carried out on the protection channel frequently, the shutdown function of the quick-closing control device is ensured to be normal, and the unit is prevented from being tripped by mistake.

The Chinese patent with the publication number of CN204512043U discloses a redundant remote-control shutdown control circuit for a quick closing valve of a main steam loop of a steam turbine, three hydraulic loops are redundantly configured in the scheme, and the unit is triggered to be tripped by mistake only when at least two electromagnetic reversing valves in the three hydraulic loops fail, so that the probability of system shutdown caused by the automatic reversing of the electromagnetic reversing valves is reduced to a certain extent, but the probability of the unit tripping by mistake is still higher in consideration of the loss caused by the accidental shutdown of the steam turbine.

The Chinese patent with the publication number of CN201372815Y discloses a quick-closing valve integrated electro-hydraulic actuator, wherein 4 shutdown solenoid valves are connected in series two by two and then connected in parallel, so that the error trip of a unit can be triggered only when any 3 shutdown solenoid valves have faults or one shutdown solenoid valve has a fault in two parallel oil paths, and the probability of system shutdown caused by the self-reversing of the shutdown solenoid valves is further reduced; because the two shutdown electromagnetic valves are connected in series and then connected in parallel, more pipelines are provided, the reliability is reduced, and the installation, the monitoring and the maintenance are difficult; meanwhile, in the implementation process of the scheme, a hydraulic control system of the steam turbine needs to be subjected to large-scale internal structure improvement, and the upgrading and modifying process is complicated and high in cost.

Based on the problems, the existing shutdown quick-closing valve group needs to be improved, the structure of the shutdown quick-closing valve group is simplified on the premise of ensuring low-error trip, and the upgrading and reconstruction cost is reduced.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a four-fetch two-speed shutdown control device, which can reduce the cost of upgrading and reconstruction on the premise of ensuring a low probability of false tripping.

Based on the above purpose, the invention provides a four-taking two-speed shutdown control device, which comprises a main control module, a first shutdown control module and a second shutdown control module, wherein the first shutdown control module and the second shutdown control module are respectively arranged at the left side and the right side of the main control module, and the first shutdown control module and the second shutdown control module are communicated through a first oil conveying pipe and a second oil conveying pipe which are externally connected;

the main control module comprises a main control module body, and a starting oil control valve, a quick closing oil control valve, a first unloading cartridge valve, a second unloading cartridge valve and a third unloading cartridge valve which are arranged on the main control module body; wherein: the starting oil control valve and the quick-closing oil control valve are arranged on the front side of the main control module body, the first unloading cartridge valve is arranged below the first stopping control module, and the second unloading cartridge valve is arranged below the second stopping control module; the P port of the starting oil control valve, the P port of the quick oil closing control valve, the oil inlets of the first unloading cartridge valve and the second unloading cartridge valve and the oil outlet of the third unloading cartridge valve are all communicated with a pressure oil source, and the T port of the starting oil control valve, the T port of the quick oil closing control valve, and the oil outlets of the first unloading cartridge valve and the second unloading cartridge valve are all communicated with an oil return port; the port B of the starting oil control valve is communicated with a starting oil port of the quick-closing valve, and the port A of the quick-closing oil control valve and an oil inlet of the third unloading cartridge valve are communicated with a quick-closing oil port of the quick-closing valve; the port B of the quick-closing oil control valve is communicated with an upper cavity of a third unloading cartridge valve; the upper cavity of the first unloading cartridge valve and the upper cavity of the second unloading cartridge valve are both communicated with a second oil pipeline;

the first shutdown control module comprises a first shutdown control module body, and a first shutdown solenoid valve, a second shutdown solenoid valve, a first cartridge valve and a second cartridge valve which are arranged on the first shutdown control module body, and the second shutdown control module comprises a second shutdown control module body, and a third shutdown solenoid valve, a fourth shutdown solenoid valve, a third cartridge valve and a fourth cartridge valve which are arranged on the second shutdown control module body; wherein: the port P of the first shutdown electromagnetic valve, the port P of the second shutdown electromagnetic valve, the port P of the third shutdown electromagnetic valve and the port P of the fourth shutdown electromagnetic valve are communicated with a pressure oil source; the T port of the first shutdown electromagnetic valve, the T port of the second shutdown electromagnetic valve, the T port of the third shutdown electromagnetic valve and the T port of the fourth shutdown electromagnetic valve are communicated with the oil return port; the upper cavity of the first cartridge valve is communicated with the port A of the first stop solenoid valve, the upper cavity of the second cartridge valve is communicated with the port A of the second stop solenoid valve, the upper cavity of the third cartridge valve is communicated with the port A of the third stop solenoid valve, and the upper cavity of the fourth cartridge valve is communicated with the port A of the fourth stop solenoid valve; an oil inlet of the first cartridge valve and an oil inlet of the second cartridge valve are communicated with an oil return port; an oil outlet of the first cartridge valve and an oil outlet of the second cartridge valve are communicated with an oil inlet of the third cartridge valve and an oil inlet of the fourth cartridge valve through a first oil conveying pipe; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and communicated with a second oil conveying pipe; the second oil delivery pipe is also communicated with a pressure oil source through a throttling hole;

when at least one shutdown solenoid valve in the first shutdown control module and the second shutdown control module has a fault, the pressure in the second oil delivery pipe is lost, so that the first unloading cartridge valve and the second unloading cartridge valve are triggered to act, the pressure in the speed-off oil passage in the speed-off control device is lost, the speed-off valve of the steam turbine is closed, and the whole unit is shut down.

Preferably, the first stop solenoid valve and the second stop solenoid valve are fixed on the first stop control module body through a first connecting block, and the third stop solenoid valve and the fourth stop solenoid valve are fixed on the second stop control module body through a second connecting block.

Preferably, a manual stop valve is further arranged at the top of the main control module body, a port P of the manual stop valve is communicated with a pressure oil source, a port T is communicated with an oil return port, a port A is respectively communicated with a port P of the first stop electromagnetic valve, a port P of the second stop electromagnetic valve, a port P of the third stop electromagnetic valve and a port P of the fourth stop electromagnetic valve, so that the manual stop valve is connected in series between the pressure oil source and the first stop control module as well as between the first stop control module and the second stop control module, when the manual stop valve is manually controlled to be reversed to enable the port P to be communicated with the port T, the pressure oil source is directly communicated with the oil return port, a quick-closing oil path is depressurized, a steam turbine quick-closing valve is directly closed, and the whole unit is stopped.

Preferably, the top of the main control module body is further provided with a double-end electromagnetic directional valve, a port P of the double-end electromagnetic directional valve is communicated with the pressure oil source, a port T is communicated with the oil return port, and the port A and the port B are respectively communicated with a test oil port.

Preferably, the upper chamber of the first cartridge valve, the upper chamber of the second cartridge valve, the upper chamber of the third cartridge valve and the upper chamber of the fourth cartridge valve are respectively communicated with an online oil pressure detection port for online detection of the working state of the corresponding shutdown solenoid valve.

Preferably, the pressure oil source, the starting oil port and the quick-closing oil port are respectively communicated with an online oil pressure detection port.

Preferably, a pressure switch or a pressure transmitter is arranged at the online oil pressure detection port.

Preferably, a shutoff valve is further provided between the T port of the startup oil control valve and the oil return port, and an orifice is further provided between the shutoff valve and the T port of the startup oil control valve.

Preferably, the main control module body is further provided with a combination valve serving as a safety device, a port P of the combination valve is communicated with the pressure oil source, a port A of the combination valve is communicated with the starting oil port, a port B of the combination valve is communicated with the quick oil closing port, and a port T of the combination valve is communicated with the oil return port.

Preferably, the device further comprises a support frame, the main control module is fixed on the support frame, and two ends of the first oil delivery pipe and two ends of the second oil delivery pipe respectively penetrate through the support frame from the bottom of the main control module and then are connected to the first stopping control module and the second stopping control module.

Compared with the prior art, the invention has the beneficial effects that:

according to the scheme provided by the invention, on the premise of ensuring the low false tripping probability, the structure of the shutdown quick-closing valve group is simplified, and the performance reliability of the valve group is improved; and the first shutdown control module and the second shutdown control module realize oil circuit communication through the first oil conveying pipe and the second oil conveying pipe outside, so that pipeline modification is not needed to be carried out inside the main control module of the steam turbine quick-closing control system in the upgrading and transforming process, the upgrading and transforming cost is low, and the practicability is high.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

Fig. 1 is a structure diagram of a pipeline connection of a four-taking two-speed shut-off valve set in the first embodiment of the invention;

FIG. 2 is a front view of an external structure of a two-out-of-four valve shutting down valve set according to a first embodiment of the present invention;

FIG. 3 is a side view of the external structure of a two-out-of-four shut-off stop valve set according to one embodiment of the present invention;

fig. 4 is a schematic structural diagram of a two-speed four-taking shutdown control system having the above valve set according to a first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a two-speed four-taking shutdown control device having the above system according to a first embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fast shutdown system with a emergency security device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a fast shutdown system with a emergency security device according to a second embodiment of the present invention.

Wherein, 1, a main control module; 2. a first shutdown control module; 3. a second shutdown control module; 4. a critical security device; 5. a first oil delivery pipe; 6. a second oil delivery pipe; 7. a support frame; 8. and (5) quickly closing the valve.

Detailed Description

The invention is further described with reference to the following figures and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Example one

As shown in fig. 1, in the present embodiment, firstly, a four-taking two-speed shutdown valve group is provided, the valve group includes a first shutdown control module 2 and a second shutdown control module 3, the first shutdown control module 2 includes a first shutdown solenoid valve 2223, a second shutdown solenoid valve 2224, a first cartridge valve, a second cartridge valve and a first control port K1, and the second shutdown control module 3 includes a third shutdown solenoid valve 2225, a fourth shutdown solenoid valve 2226, a third cartridge valve, a fourth cartridge valve and a second control port K2; wherein:

the port P of the first shutdown solenoid valve 2223, the port P of the second shutdown solenoid valve 2224, the port P of the third shutdown solenoid valve 2225 and the port P of the fourth shutdown solenoid valve 2226 are all communicated with a pressure oil source of the quick-closing control device; the T port of the first shutdown solenoid valve 2223, the T port of the second shutdown solenoid valve 2224, the T port of the third shutdown solenoid valve 2225 and the T port of the fourth shutdown solenoid valve 2226 are all communicated with the oil return port of the quick-closing control device;

the upper chamber of the first cartridge valve is communicated with the port A of the first shut-down solenoid valve 2223, the upper chamber of the second cartridge valve is communicated with the port A of the second shut-down solenoid valve 2224, the upper chamber of the third cartridge valve is communicated with the port A of the third shut-down solenoid valve 2225, and the upper chamber of the fourth cartridge valve is communicated with the port A of the fourth shut-down solenoid valve 2226; an oil inlet of the first cartridge valve and an oil inlet of the second cartridge valve are communicated with an oil return port of the quick shutdown device; as shown in fig. 2 and 3, the oil outlet of the first cartridge valve and the oil outlet of the second cartridge valve are communicated with the oil inlet of the third cartridge valve and the oil inlet of the fourth cartridge valve through a first oil delivery pipe 5; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and communicated with the second oil conveying pipe 6; the second oil delivery pipe 6 is also communicated with a pressure oil source through a first orifice; therefore, when at least one of the first shutdown control module 2 and the second shutdown control module 3 has a fault, the pressure in the second oil pipeline 6 is lost;

referring to fig. 1, the first control port K1 and the second control port K2 are respectively connected to two ends of the second oil delivery pipe 6, the first control port K1 and the second control port K2 are both communicated with a pressure relief valve of the quick-closing control device, and when the second oil delivery pipe 6 loses pressure, the pressure relief valve acts to cause the quick-closing oil passage to lose pressure, so that the steam turbine quick-closing valve 8 is closed and the whole unit is shut down.

As a preferred embodiment, the first shutdown control module 2 further includes a first shutdown control module body, and the first shutdown solenoid valve 2223, the second shutdown solenoid valve 2224, the first cartridge valve, the second cartridge valve, and the first control port K1 are all disposed in the first shutdown control module body;

the second shutdown control module 3 further comprises a second shutdown control module body, and the third shutdown solenoid valve 2225, the fourth shutdown solenoid valve 2226, the third cartridge valve, the fourth cartridge valve and the second control port K2 are all arranged in the second shutdown control module body;

and the first oil delivery pipe 5 and the second oil delivery pipe 6 are external pipelines connected between the first stop control module body and the second stop control module body.

As a preferred embodiment, the upper chamber of the first cartridge valve, the upper chamber of the second cartridge valve, the upper chamber of the third cartridge valve and the upper chamber of the fourth cartridge valve are respectively communicated with an online detection oil port. Preferably, the online detection oil port is provided with a pressure switch or a pressure transmitter. Specifically, as shown in fig. 1, in the first shutdown control module 2, the P23 and P24 oil ports are online monitoring oil ports, a pressure switch or a pressure transmitter may be disposed therein to monitor the operating states of the two shutdown solenoid valves online, and the simplified version of the design may be disposed with an online monitoring port to detect the operating states of the shutdown solenoid valves through a detection tool or a pressure gauge type disposed therein. In the second shutdown control module 3, the P25 and P26 oil ports are online monitoring oil ports, a pressure switch or a pressure transmitter can be arranged here to monitor the working states of the two shutdown solenoid valves online, and the simple design can be provided with the online monitoring ports to detect the working states of the shutdown solenoid valves through a detection tool or a pressure gauge type arranged here.

As a preferred embodiment, the first shutdown solenoid valve 2223, the second shutdown solenoid valve 2224, the third shutdown solenoid valve 2225, and the fourth shutdown solenoid valve 2226 all adopt solenoid valves with position switches, and the operating state of the shutdown solenoid valves is determined by monitoring the position of valve spools of the solenoid valves.

As shown in fig. 4, the present embodiment further provides a four-taking two-speed shutdown control system applying the four-taking two-speed shutdown valve group, the system includes a main control module 1, a first shutdown control module 2, and a second shutdown control module 3, where the main control module 1 includes a start oil control valve 1843, a quick shutdown oil control valve 1842, a first unloading cartridge valve, a second unloading cartridge valve, and a third unloading cartridge valve; wherein the start oil control valve 1843 is used to establish start oil (F), and the quick-close oil control valve 1842 is used to establish quick-close oil (E2); the first stopping control module 2 comprises a first stopping solenoid valve 2223, a second stopping solenoid valve 2224, a first cartridge valve and a second cartridge valve, and the second stopping control module 3 comprises a third stopping solenoid valve 2225, a fourth stopping solenoid valve 2226, a third cartridge valve and a fourth cartridge valve; wherein:

the port P of the first shutdown solenoid valve 2223, the port P of the second shutdown solenoid valve 2224, the port P of the third shutdown solenoid valve 2225 and the port P of the fourth shutdown solenoid valve 2226 are all communicated with a pressure oil source; the T port of the first shutdown solenoid valve 2223, the T port of the second shutdown solenoid valve 2224, the T port of the third shutdown solenoid valve 2225 and the T port of the fourth shutdown solenoid valve 2226 are all communicated with the oil return port;

the upper chamber of the first cartridge valve is communicated with the port A of the first shut-down solenoid valve 2223, the upper chamber of the second cartridge valve is communicated with the port A of the second shut-down solenoid valve 2224, the upper chamber of the third cartridge valve is communicated with the port A of the third shut-down solenoid valve 2225, and the upper chamber of the fourth cartridge valve is communicated with the port A of the fourth shut-down solenoid valve 2226; an oil inlet of the first cartridge valve and an oil inlet of the second cartridge valve are communicated with an oil return port; an oil outlet of the first cartridge valve and an oil outlet of the second cartridge valve are communicated with an oil inlet of the third cartridge valve and an oil inlet of the fourth cartridge valve through a first oil conveying pipe 5; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and communicated with the second oil conveying pipe 6; the second oil delivery pipe 6 is also communicated with a pressure oil source through an orifice; when at least one of the first shutdown control module 2 and the second shutdown control module 3 has a fault, the pressure in the second oil pipeline 6 is lost;

the upper cavities of the first unloading cartridge valve and the second unloading cartridge valve are communicated with a second oil conveying pipe 6, the P port of the starting oil control valve 1843, the P port of the quick-closing oil control valve 1842, the oil inlets of the first unloading cartridge valve and the second unloading cartridge valve and the oil outlet of the third unloading cartridge valve are communicated with a pressure oil source, and the T port of the starting oil control valve 1843, the T port of the quick-closing oil control valve 1842, the oil outlets of the first unloading cartridge valve and the second unloading cartridge valve are communicated with an oil return port; the port B of the starting oil control valve 1843 is communicated with a starting oil port of the quick-closing valve 8, and the port A of the quick-closing oil control valve 1842 and an oil inlet of the third unloading cartridge valve are communicated with a quick-closing oil port of the quick-closing valve 8; the port B of the quick-closing oil control valve 1842 is communicated with an upper cavity of the third unloading cartridge valve; when the second oil delivery pipe 6 loses pressure, the first unloading cartridge valve and the second unloading cartridge valve act to enable the quick-closing oil way to lose pressure, so that the quick-closing valve 8 of the steam turbine is closed, and the whole unit is stopped.

As a preferred embodiment, the main control module 1 further includes a manual shutdown valve 2250 for manual shutdown of the steam turbine. The P port of the manual stop valve 2250 is communicated with a pressure oil source, the T port is communicated with an oil return port, the a port is respectively communicated with the P port of the first stop solenoid valve 2223, the P port of the second stop solenoid valve 2224, the P port of the third stop solenoid valve 2225 and the P port of the fourth stop solenoid valve 2226, so that the manual stop valve 2250 is connected in series between the pressure oil source and the first stop control module 2 and the second stop control module 3, when the manual stop valve 2250 is manually controlled to be reversed to communicate the P port and the T port thereof, the pressure oil source is directly communicated with the oil return port, so that the quick-closing oil path is depressurized, the turbine quick-closing valve 8 is directly closed, and the whole unit is stopped.

As a preferred embodiment, the main control module 1 further includes a double-headed electromagnetic directional valve 2309, a P port of the double-headed electromagnetic directional valve 2309 is communicated with a pressure oil source, a T port is communicated with an oil return port, and a port a and a port B are respectively communicated with a test oil port, so as to control the turbine quick-closing valve test oil H1/H2.

As a preferred embodiment, the upper chamber of the first cartridge valve, the upper chamber of the second cartridge valve, the upper chamber of the third cartridge valve and the upper chamber of the fourth cartridge valve are respectively communicated with an online oil pressure detection port for online detecting the working state of the corresponding shutdown solenoid valve.

As a better implementation scheme, the pressure oil source, the starting oil port and the quick oil closing port are respectively communicated with an online oil pressure detection port.

As a better embodiment, a pressure switch is arranged at the online oil pressure detection port.

As a better implementation scheme, a pressure transmitter is arranged at the online oil pressure detection port.

In a preferred embodiment, a stop valve is further disposed between the T-port of the start oil control valve 1843 and the oil return port, and an orifice is further disposed between the stop valve and the T-port of the start oil control valve 1843.

As a preferred embodiment, the first stop solenoid valve 2223, the second stop solenoid valve 2224, the third stop solenoid valve 2225 and the fourth stop solenoid valve 2226 are solenoid valves with position switches.

As a preferred embodiment, the main control module 1 further includes a combination valve 2200 as a safety device, where a port P of the combination valve 2200 is communicated with a pressure oil source, a port a is communicated with a start oil port, a port B is communicated with a quick oil shut-off port, and a port T is communicated with an oil return port.

According to the scheme, on the premise of ensuring low false tripping probability, the structure of the shutdown quick-closing valve group is simplified, and the performance reliability of the valve group is improved; and the first shutdown control module and the second shutdown control module realize oil circuit communication through the first oil conveying pipe and the second oil conveying pipe outside, so that pipeline modification is not needed to be carried out inside the main control module of the steam turbine quick-closing control system in the upgrading and transforming process, the upgrading and transforming cost is low, and the practicability is high.

As shown in fig. 5, the embodiment further provides a four-taking two-speed shutdown control device applying the four-taking two-speed shutdown valve set, the device includes a main control module 1, a first shutdown control module 2 and a second shutdown control module 3, wherein the first shutdown control module 2 and the second shutdown control module 3 are respectively disposed on the left and right sides of the main control module 1, and the first shutdown control module 2 and the second shutdown control module 3 are communicated with each other through a first oil delivery pipe 5 and a second oil delivery pipe 6 which are externally connected;

the main control module 1 comprises a main control module body, and a starting oil control valve 1843, a quick closing oil control valve 1842, a first unloading cartridge valve, a second unloading cartridge valve and a third unloading cartridge valve which are arranged on the main control module body; wherein: the starting oil control valve 1843 and the quick-closing oil control valve 1842 are arranged on the front side of the main control module body, the first unloading cartridge valve is arranged below the first stopping control module 2, and the second unloading cartridge valve is arranged below the second stopping control module 3; the P port of the starting oil control valve 1843, the P port of the quick-closing oil control valve 1842, the oil inlets of the first unloading cartridge valve and the second unloading cartridge valve and the oil outlet of the third unloading cartridge valve are all communicated with a pressure oil source, and the T port of the starting oil control valve 1843, the T port of the quick-closing oil control valve 1842, and the oil outlets of the first unloading cartridge valve and the second unloading cartridge valve are all communicated with an oil return port; the port B of the starting oil control valve 1843 is communicated with a starting oil port of the quick-closing valve 8, and the port A of the quick-closing oil control valve 1842 and an oil inlet of the third unloading cartridge valve are communicated with a quick-closing oil port of the quick-closing valve 8; the port B of the quick-closing oil control valve 1842 is communicated with an upper cavity of the third unloading cartridge valve; the upper cavity of the first unloading cartridge valve and the upper cavity of the second unloading cartridge valve are both communicated with a second oil pipeline 6;

the first stopping control module 2 comprises a first stopping control module body, and a first stopping solenoid valve 2223, a second stopping solenoid valve 2224, a first cartridge valve and a second cartridge valve which are arranged on the first stopping control module body, and the second stopping control module 3 comprises a second stopping control module body, and a third stopping solenoid valve 2225, a fourth stopping solenoid valve 2226, a third cartridge valve and a fourth cartridge valve which are arranged on the second stopping control module body; wherein: the port P of the first shutdown solenoid valve 2223, the port P of the second shutdown solenoid valve 2224, the port P of the third shutdown solenoid valve 2225 and the port P of the fourth shutdown solenoid valve 2226 are all communicated with a pressure oil source; the T port of the first shutdown solenoid valve 2223, the T port of the second shutdown solenoid valve 2224, the T port of the third shutdown solenoid valve 2225 and the T port of the fourth shutdown solenoid valve 2226 are all communicated with the oil return port; the upper chamber of the first cartridge valve is communicated with the port A of the first shut-down solenoid valve 2223, the upper chamber of the second cartridge valve is communicated with the port A of the second shut-down solenoid valve 2224, the upper chamber of the third cartridge valve is communicated with the port A of the third shut-down solenoid valve 2225, and the upper chamber of the fourth cartridge valve is communicated with the port A of the fourth shut-down solenoid valve 2226; an oil inlet of the first cartridge valve and an oil inlet of the second cartridge valve are communicated with an oil return port; an oil outlet of the first cartridge valve and an oil outlet of the second cartridge valve are communicated with an oil inlet of the third cartridge valve and an oil inlet of the fourth cartridge valve through a first oil conveying pipe 5; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and communicated with the second oil conveying pipe 6; the second oil delivery pipe 6 is also communicated with a pressure oil source through an orifice;

when at least one of the first stopping control module 2 and the second stopping control module 3 has a fault, the pressure in the second oil pipeline 6 is reduced, so that the first unloading cartridge valve and the second unloading cartridge valve are triggered to act, the pressure in a speed-closing oil way in the speed-closing control device is reduced, the speed-closing valve 8 of the steam turbine is closed, and the whole unit is stopped.

As a preferred embodiment, the first shutdown solenoid valve 2223 and the second shutdown solenoid valve 2224 are both fixed to the first shutdown control module body through a first connecting block, and the third shutdown solenoid valve 2225 and the fourth shutdown solenoid valve 2226 are both fixed to the second shutdown control module body through a second connecting block. Preferably, the sealing rings are used for sealing between each valve body and each shutdown module, between each valve body and the main control module 1, and between each shutdown module and the main control module 1. Therefore, single components in the security and control system of the existing steam turbine are combined together, the sealing effect is realized by using the sealing ring, the defects of multiple pipelines and complex installation of the traditional steam turbine are overcome, the steam turbine is easy to monitor in operation, the oil leakage fire accident can be prevented, and the reliability and the safety of the operation of the steam turbine are improved.

As a preferred embodiment, a manual shutdown valve 2250 is further disposed at the top of the main control module body, a P port of the manual shutdown valve 2250 is communicated with a pressure oil source, a T port is communicated with an oil return port, and a port a is respectively communicated with a P port of the first shutdown solenoid valve 2223, a P port of the second shutdown solenoid valve 2224, a P port of the third shutdown solenoid valve 2225, and a P port of the fourth shutdown solenoid valve 2226, so that the manual shutdown valve 2250 is connected in series between the pressure oil source and the first shutdown control module 2 and the second shutdown control module 3, and when the manual shutdown valve 2250 is manually controlled to be switched to communicate the P port and the T port, the pressure oil source is directly communicated with the oil return port, so that the pressure of the fast shutdown oil path is lost, the fast shutdown valve 8 of the steam turbine is directly closed, and the whole unit is shutdown.

As a better implementation scheme, the top of the main control module body is further provided with a double-end electromagnetic directional valve 2309, a P port of the double-end electromagnetic directional valve 2309 is communicated with a pressure oil source, a T port is communicated with an oil return port, and a port a and a port B are respectively communicated with a test oil port.

As a better implementation scheme, a pressure switch or a pressure transmitter is arranged at the online oil pressure detection port.

As a preferred embodiment, the main control module body is further provided with a combination valve 2200 as a safety device, a port P of the combination valve 2200 is communicated with a pressure oil source, a port a is communicated with a start oil port, a port B is communicated with a quick oil closing port, and a port T is communicated with an oil return port.

As a better embodiment, the device further comprises a support frame 7, the main control module 1 is fixed on the support frame 7, and two ends of the first oil delivery pipe 5 and two ends of the second oil delivery pipe 6 respectively penetrate through the support frame 7 from the bottom of the main control module 1 and then are connected to the first stopping control module 2 and the second stopping control module 3.

The scheme is mainly used for opening and closing the quick-closing valve of the steam turbine, remotely starting, stopping on the spot and remotely controlling, carrying out online test on the quick-closing valve, directly connecting the quick-closing valve with the electro-hydraulic converter, carrying out online pressure measurement on the pressure gauge and the like. The operation process is as follows:

quick-closing valve

Meanwhile, the quick oil-closing control valve 1842 and the starting oil solenoid valve 1843 are electrified, the port P and the port B of the starting oil solenoid valve 1843 are communicated to establish starting oil F, the cartridge valve below the combination valve 2200 is opened, the port P and the port B of the quick oil-closing control valve 1842 are communicated at the moment, the other third unloading cartridge valve is closed, and the passages of pressure oil P and E2 are cut off. When the electromagnetic directional valve 1842 is de-energized after about 20 seconds, the pressure oil P is conducted with E2 to establish the quick-closing oil E2, and the starting oil electromagnetic valve 1843 is de-energized after about 20 seconds to connect the starting oil with the oil return port. Because the oil return port of the starting oil solenoid valve 1843 is provided with a throttle orifice plate and an adjustable throttle needle valve, the starting oil returns slowly and can be adjusted to control the opening speed of the quick-closing valve. At this point the quick-closing valve opens slowly.

Quick-closing valve test

After the quick-closing valve is opened, the state of the double-head electromagnetic directional valve 2309 is switched, so that H1 or H2 is communicated with the pressure oil P, and the quick-closing valve is subjected to an online test. The test is stopped and the double-ended solenoid operated directional valve 2309 is returned to the default position. Because of the throttle orifice plate, the displacement and reset action of the quick closing valve part are slow, and the phenomenon of closing the quick closing valve can not occur.

The embodiment also provides a four-taking two-speed shutdown control device with an emergency safety device, as shown in fig. 5 and 6, the device includes a main control module 1, a first shutdown control module 2, a second shutdown control module 3 and an emergency safety module 4, wherein the first shutdown control module 2 and the second shutdown control module 3 are respectively arranged on the left side and the right side of the main control module 1, the first shutdown control module 2 and the second shutdown control module 3 are communicated with each other through a first oil conveying pipe 5 and a second oil conveying pipe 6 which are externally connected, and the emergency safety module 4 is arranged on a steam turbine shaft;

the first stopping control module 2 comprises a first stopping control module 2 body, and a first stopping solenoid valve 2223, a second stopping solenoid valve 2224, a first cartridge valve and a second cartridge valve which are arranged on the first stopping control module 2 body, and the second stopping control module 3 comprises a second stopping control module 3 body, and a third stopping solenoid valve 2225, a fourth stopping solenoid valve 2226, a third cartridge valve and a fourth cartridge valve which are arranged on the second stopping control module 3 body; wherein: the port P of the first shutdown solenoid valve 2223, the port P of the second shutdown solenoid valve 2224, the port P of the third shutdown solenoid valve 2225 and the port P of the fourth shutdown solenoid valve 2226 are all communicated with a pressure oil source; the T port of the first shutdown solenoid valve 2223, the T port of the second shutdown solenoid valve 2224, the T port of the third shutdown solenoid valve 2225 and the T port of the fourth shutdown solenoid valve 2226 are all communicated with the oil return port; the upper chamber of the first cartridge valve is communicated with the port A of the first shut-down solenoid valve 2223, the upper chamber of the second cartridge valve is communicated with the port A of the second shut-down solenoid valve 2224, the upper chamber of the third cartridge valve is communicated with the port A of the third shut-down solenoid valve 2225, and the upper chamber of the fourth cartridge valve is communicated with the port A of the fourth shut-down solenoid valve 2226; an oil inlet of the first cartridge valve and an oil inlet of the second cartridge valve are communicated with an oil return port; an oil outlet of the first cartridge valve and an oil outlet of the second cartridge valve are communicated with an oil inlet of the third cartridge valve and an oil inlet of the fourth cartridge valve through a first oil conveying pipe 5; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and communicated with the second oil conveying pipe 6; the second oil delivery pipe 6 is also communicated with a pressure oil source through an orifice;

when at least one shutdown electromagnetic valve in the first shutdown control module 2 and the second shutdown control module 3 has a fault, the pressure in the second oil pipeline 6 is lost, so that the first unloading cartridge valve and the second unloading cartridge valve are triggered to act, the pressure of a speed-off oil path in the speed-off control device is lost, the speed-off valve 8 of the steam turbine is closed, and the whole unit is shut down;

an E0 oil port of the main control module 1 is connected with the emergency safety device 4, and the other path of pressure oil source passes through the emergency safety device 4 and then passes through an E0 oil port to a quick oil-closing control valve 18421842 and a third cartridge valve arranged on the front side of the main control module 1, so that quick oil-closing is realized (E2). The emergency safety module comprises an emergency safety valve and a flyweight which are arranged on a shaft of the steam turbine, and a port P of the emergency safety valve is communicated with a pressure oil source; the port B is communicated with a quick closing oil way; the T port is communicated with the oil return port; the port A is communicated with the port B, and the port A is an oil switching control end of the emergency safety valve; the bottom of the flyweight is pressed on a spring seat by a spring, the spring seat is fixed on the emergency safety valve, when the rotating speed or the shaft displacement of the shaft of the steam turbine exceeds a mechanical set value, the flyweight is struck and popped out by centrifugal force, or a rotor shoulder part impacts the control end of the emergency safety valve to drive the emergency safety valve to act, so that a pressure oil source is directly communicated with an oil return port, and therefore quick oil closing and pressure relief are achieved, the quick closing valve 8 of the steam turbine is closed, and the whole unit is shut down.

As a preferred embodiment, the first shutdown solenoid valve 2223 and the second shutdown solenoid valve 2224 are both fixed to the body of the first shutdown control module 2 through a first connecting block, and the third shutdown solenoid valve 2225 and the fourth shutdown solenoid valve 2226 are both fixed to the body of the second shutdown control module 3 through a second connecting block.

As a preferred embodiment, a manual stop valve is further disposed on the top of the main control module body, a port P of the manual stop valve is communicated with a pressure oil source, a port T is communicated with an oil return port, and a port a is respectively communicated with a port P of the first stop solenoid valve 2223, a port P of the second stop solenoid valve 2224, a port P of the third stop solenoid valve 2225, and a port P of the fourth stop solenoid valve 2226, so that the manual stop valve is connected in series between the pressure oil source and the first stop control module 2 and the second stop control module 3, and when the manual stop valve is manually controlled to be reversed to communicate the port P and the port T, the pressure oil source is directly communicated with the oil return port, so that the quick-close oil passage is depressurized, the turbine quick-close valve 8 is directly closed, and the entire unit is stopped.

As a better implementation scheme, a double-end electromagnetic directional valve is further arranged at the top of the main control module body, a port P of the double-end electromagnetic directional valve is communicated with a pressure oil source, a port T is communicated with an oil return port, and a port A and a port B are respectively communicated with a test oil port; and orifices are arranged between the port A of the double-head electromagnetic directional valve and the test oil port and between the port B of the double-head electromagnetic directional valve and the test oil port.

In a preferred embodiment, a stop valve is further provided between the T port of the start oil control valve 1843 and the oil return port, and a second orifice is further provided between the stop valve and the T port of the start oil control valve 1843.

As a better implementation scheme, a combined valve used as a safety device is further arranged on the main control module body, a port P of the combined valve is communicated with a pressure oil source, a port A is communicated with a starting oil port, a port B is communicated with a quick oil closing port, and a port T is communicated with an oil return port.

As a better implementation scheme, the device further comprises a support frame, the main control module is fixed on the support frame, and two ends of the first oil delivery pipe 5 and two ends of the second oil delivery pipe 6 respectively penetrate through the support frame from the bottom of the main control module and then are connected to the first stopping control module 2 and the second stopping control module 3.

quick-closing valve

Meanwhile, the electromagnetic

directional valves

1842 and 1843 are electrified, the port P and the port B of the electromagnetic directional valve 1843 are communicated, starting oil F is established, the DG16 cartridge valve below the combination valve 2200 is opened, the port P of the electromagnetic directional valve 1842 is communicated with the port B, the other DG16 cartridge valve is closed, and the passage of pressure oil P and E2 is cut off. When the electromagnetic directional valve 1842 is de-energized after about 20 seconds, the pressure oil P is conducted with E2 to establish the quick-closing oil E2, and when about 20 seconds later, the electromagnetic directional valve 1843 is de-energized to connect the starting oil with the oil return port. Because the oil return port of the electromagnetic directional valve 1843 is provided with the throttle orifice plate and the adjustable throttle needle valve, the oil return of the starting oil is slow and can be adjusted to control the opening speed of the quick-closing valve. At this point the quick-closing valve opens slowly.

Further, as shown in fig. 6, the present embodiment further provides a rapid shutdown control system with a critical security device, the system includes a main control module, a first shutdown control module, a second shutdown control module, and a critical security module, wherein:

the main control module comprises a starting oil control valve 1843, a quick closing oil control valve 1842, a first unloading cartridge valve, a second unloading cartridge valve and a third unloading cartridge valve; the P port of the starting oil control valve 1843, the P port of the quick-closing oil control valve 1842, the oil inlets of the first unloading cartridge valve and the second unloading cartridge valve and the oil outlet of the third unloading cartridge valve are all communicated with a pressure oil source, and the T port of the starting oil control valve 1843, the T port of the quick-closing oil control valve 1842, the oil outlets of the first unloading cartridge valve and the second unloading cartridge valve are all communicated with an oil return port; the port B of the starting oil control valve 1843 is communicated with a starting oil port of the quick-closing valve, and the port A of the quick-closing oil control valve 1842 and an oil inlet of the third unloading cartridge valve are communicated with a quick-closing oil port of the quick-closing valve; the port B of the quick-closing oil control valve 1842 is communicated with an upper cavity of the third unloading cartridge valve; the upper cavity of the first unloading cartridge valve is communicated with the first shutdown control module, and the upper cavity of the second unloading cartridge valve is communicated with the second shutdown control module;

when at least one shutdown electromagnetic valve in the first shutdown control module and the second shutdown control module has a fault, the first unloading cartridge valve and the second unloading cartridge valve are triggered to act, so that a quick-closing oil way in the quick-closing control device is decompressed, a quick-closing valve of a steam turbine is closed, and the whole unit is shut down;

the emergency safety module comprises an emergency safety valve and a flyweight which are arranged on a shaft of the steam turbine, and the P end of the emergency safety valve is communicated with a pressure oil source; the end B is communicated with a quick closing oil way; the T port is communicated with the oil return port; the port A is communicated with the port B, and the port A is an oil switching control end of the emergency safety valve; the bottom of the flyweight is pressed on a spring seat by a spring, the spring seat is fixed on the emergency safety valve, when the rotating speed or the shaft displacement of the shaft of the steam turbine exceeds a mechanical set value, the flyweight is popped up by centrifugal force due to overlarge rotating speed or the convex shoulder part of the rotor impacts the control end of the emergency safety valve to drive the emergency safety valve to act, so that a pressure oil source is directly communicated with an oil return port, and therefore, the pressure of the quickly-closed oil is relieved, the quick-closed valve of the steam turbine is closed, and the whole unit is shut down.

As a preferred embodiment, the first stop control module includes a first stop solenoid valve 2223, a second stop solenoid valve 2224, a first cartridge valve and a second cartridge valve, and the second stop control module includes a third stop solenoid valve 2225, a fourth stop solenoid valve 2226, a third cartridge valve and a fourth cartridge valve; wherein: the port P of the first shutdown solenoid valve 2223, the port P of the second shutdown solenoid valve 2224, the port P of the third shutdown solenoid valve 2225 and the port P of the fourth shutdown solenoid valve 2226 are all communicated with a pressure oil source; the T port of the first shutdown solenoid valve 2223, the T port of the second shutdown solenoid valve 2224, the T port of the third shutdown solenoid valve 2225 and the T port of the fourth shutdown solenoid valve 2226 are all communicated with the oil return port; the upper chamber of the first cartridge valve is communicated with the port A of the first shut-down solenoid valve 2223, the upper chamber of the second cartridge valve is communicated with the port A of the second shut-down solenoid valve 2224, the upper chamber of the third cartridge valve is communicated with the port A of the third shut-down solenoid valve 2225, and the upper chamber of the fourth cartridge valve is communicated with the port A of the fourth shut-down solenoid valve 2226; an oil inlet of the first cartridge valve and an oil inlet of the second cartridge valve are communicated with an oil return port; an oil outlet of the first cartridge valve and an oil outlet of the second cartridge valve are communicated with an oil inlet of the third cartridge valve and an oil inlet of the fourth cartridge valve through a first oil conveying pipe; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and communicated with a second oil conveying pipe; the second oil delivery pipe is also in communication with a pressure oil source through an orifice.

As a preferred embodiment, a manual shutdown valve 2250 is further disposed in the main control module, a P port of the manual shutdown valve 2250 is communicated with a pressure oil source, a T port is communicated with an oil return port, and a port a is respectively communicated with a P port of the first shutdown solenoid valve 2223, a P port of the second shutdown solenoid valve 2224, a P port of the third shutdown solenoid valve 2225, and a P port of the fourth shutdown solenoid valve 2226, so that the manual shutdown valve 2250 is connected in series between the pressure oil source and the first shutdown control module and the second shutdown control module, and when the manual shutdown valve 2250 is manually controlled to be switched to communicate the P port and the T port, the pressure oil source is directly communicated with the oil return port, so that the pressure of the fast shutdown oil path is lost, the fast shutdown valve of the steam turbine is directly closed, and the whole unit is shut down.

As a better implementation scheme, a double-headed electromagnetic directional valve 2309 is further arranged in the main control module, a P port of the double-headed electromagnetic directional valve 2309 is communicated with a pressure oil source, a T port is communicated with an oil return port, a port a and a port B are respectively communicated with a test oil port, and the test oil port is communicated with an online oil pressure detection port.

As a preferred embodiment, orifices are arranged between the ports a and B of the double-ended electromagnetic directional valve 2309 and the test oil port.

P23 to P25 in fig. 1 to 3, and P03 and P04 in fig. 4, 6 and 7, and the like are all on-line oil pressure detection ports.

quick-closing valve

Meanwhile, the quick oil-closing control valve 1842 and the starting oil solenoid valve 1843 are electrified, the port P and the port B of the starting oil solenoid valve 1843 are communicated to establish starting oil F, at the moment, the port P and the port B of the quick oil-closing control valve 1842 are communicated to close the other third unloading cartridge valve, and the pressure oil P and the E2 are cut off. When the electromagnetic directional valve 1842 is de-energized after about 20 seconds, the pressure oil P is conducted with E2 to establish the quick-closing oil E2, and the starting oil electromagnetic valve 1843 is de-energized after about 20 seconds to connect the starting oil with the oil return port. Because the oil return port of the starting oil solenoid valve 1843 is provided with a throttle orifice plate and an adjustable throttle needle valve, the starting oil returns slowly and can be adjusted to control the opening speed of the quick-closing valve. At this point the quick-closing valve opens slowly.

Quick-closing valve test

Emergency shutdown

The remote shutdown is realized by electromagnetic

directional valves

2223, 2224, 2225, 2226. When at least one of the electromagnetic

directional valves

2223, 2224 of the first shutdown control module 2 and at least one of the electromagnetic

directional valves

2225, 2226 of the second shutdown control module 3 act, the corresponding cartridge valve is rapidly opened under the action of the spring force, the quick-closing oil is communicated with the return oil, and the quick-closing valve 8 is instantly closed under the action of the spring force. The manual shutdown is realized by the manual reversing valve 2250, which opens the safety of the manual shutdown valve 2250, pushes the handle of the manual shutdown valve 2250 forward, and quickly closes the quick-closing valve.

Overspeed or excessive shaft displacement stop

When the actual rotating speed of the rotating machinery (a turbine rotating shaft) exceeds a mechanical set value, the flyweight on the rotor flies out to quickly strike the flyweight of the emergency safety device to pop up the flyweight, so that the emergency safety device acts to quickly relieve the pressure of an oil way, and the quick closing valve is quickly closed. And the emergency safety device is ejected out by striking the flyweight of the emergency safety device by the convex shoulder on the rotor when the shaft of the rotating machine (the rotating shaft of the steam turbine) is excessively displaced, so that the emergency safety device acts to quickly release the pressure of the oil circuit, and the quick closing valve is quickly closed.

Secondary oil conditioning

The oil port is connected with an electro-hydraulic converter (not shown in the drawing), and the fast-closing oil is converted into secondary oil through the electro-hydraulic converter and then is output.

The invention is connected with the electro-hydraulic converter (without the part) through oil ports A and B, and the like, and the quick-closing oil is converted into secondary oil through the electro-hydraulic converter and then is output through a port C1 or a port C2.

The scheme can realize overspeed shutdown of the steam turbine, effectively avoids the problem that equipment is damaged due to overspeed or excessive shaft displacement, is easier to monitor the condition of the steam turbine in operation, can prevent oil leakage and fire accidents, and increases the reliability and safety of unit operation.

Example two

The first shutdown control module and the second shutdown control module of this embodiment are different from the first embodiment in structure, specifically: the present embodiment further provides a rapid shutdown control system with a critical safety device, as shown in fig. 7,

the first shutdown control module 2 comprises a first shutdown solenoid valve 2223, the second shutdown control module 3 comprises a third shutdown solenoid valve 2225, wherein a port P of the first shutdown solenoid valve 2223 and a port P of the third shutdown solenoid valve 2225 are both communicated with a pressure oil source, a port T of the first shutdown solenoid valve 2223 and a port T of the third shutdown solenoid valve 2225 are both communicated with an oil return port, a port B of the first shutdown solenoid valve 2223 is communicated with an upper chamber of the first unloading cartridge valve, and a port B of the third shutdown solenoid valve 2225 is communicated with an upper chamber of the second unloading cartridge valve, so that when the first shutdown solenoid valve 2223 and the second shutdown solenoid valve 2224 are simultaneously de-energized, the first unloading cartridge valve and the second unloading cartridge valve are triggered to act.

As a preferred embodiment, a manual shutdown valve 2250 is further disposed in the main control module 1, a P port of the manual shutdown valve 2250 is communicated with a pressure oil source, a T port is communicated with an oil return port, and a port a is respectively communicated with a P port of the first shutdown solenoid valve 2223, a P port of the second shutdown solenoid valve 2224, a P port of the third shutdown solenoid valve 2225, and a P port of the fourth shutdown solenoid valve 2226, so that the manual shutdown valve 2250 is connected in series between the pressure oil source and the first shutdown control module 2 and the second shutdown control module 3, and when the manual shutdown valve 2250 is manually controlled to be switched to communicate the P port and the T port, the pressure oil source is directly communicated with the oil return port, so that a pressure of a speed shutdown oil path is lost, and a turbine speed shutdown valve 8 is directly closed to shut down an entire unit.

As a preferred embodiment, the main control module 1 is further provided with a double-ended electromagnetic directional valve 2309, a port P of the double-ended electromagnetic directional valve 2309 is communicated with a pressure oil source, a port T is communicated with an oil return port, the port a and the port B are respectively communicated with a test oil port, and the test oil port is communicated with an online oil pressure detection port.

In conclusion, the invention can realize the overspeed or displacement overrun shutdown of the steam turbine, effectively avoid the problem of overspeed or overlarge shaft displacement, easily monitor the running condition of the steam turbine, prevent oil leakage and fire accidents, and improve the reliability and safety of unit operation.

Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the principle and spirit of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.

Claims

1. A four-taking two-speed shutdown control device is characterized by comprising a main control module, a first shutdown control module and a second shutdown control module, wherein the first shutdown control module and the second shutdown control module are respectively arranged on the left side and the right side of the main control module, and the first shutdown control module and the second shutdown control module are communicated through a first oil conveying pipe and a second oil conveying pipe which are externally connected;

2. A two-speed shutdown control device according to claim 1, wherein the first shutdown solenoid valve and the second shutdown solenoid valve are fixed to the first shutdown control module body through a first connection block, and the third shutdown solenoid valve and the fourth shutdown solenoid valve are fixed to the second shutdown control module body through a second connection block.

3. The control device of a two-speed shutdown machine according to claim 1, wherein a manual shutdown valve is further disposed on the top of the main control module body, a port P of the manual shutdown valve is communicated with the pressure oil source, a port T is communicated with the oil return port, a port a is respectively communicated with a port P of the first shutdown solenoid valve, a port P of the second shutdown solenoid valve, a port P of the third shutdown solenoid valve, and a port P of the fourth shutdown solenoid valve, so that the manual shutdown valve is connected in series between the pressure oil source and the first shutdown control module and the second shutdown control module, when the manual shutdown valve is manually controlled to be reversed to communicate the port P and the port T, the pressure oil source is directly communicated with the oil return port, and thus the pressure of the speed shutdown oil path is lost, and the turbine speed shutdown valve is directly shut down and the whole machine set is shut down.

4. The two-speed four-pick-up shutdown control device according to claim 1, wherein a double-headed electromagnetic directional valve is further disposed on the top of the main control module body, a port P of the double-headed electromagnetic directional valve is communicated with the pressure oil source, a port T is communicated with the oil return port, and a test oil port is respectively communicated with the port a and the port B.

5. The two-speed shutdown control device according to claim 1, wherein the upper chamber of the first cartridge valve, the upper chamber of the second cartridge valve, the upper chamber of the third cartridge valve and the upper chamber of the fourth cartridge valve are respectively communicated with an online oil pressure detection port for online detection of the operating state of the corresponding shutdown solenoid valve.

6. A two-speed four-pick-up shutdown control device according to claim 1, wherein an online oil pressure detection port is communicated with each of the pressure oil source, the start-up oil port and the fast shutdown oil port.

7. A two-speed four-take shutdown control device according to claim 5 or 6, wherein a pressure switch or a pressure transmitter is provided at the on-line oil pressure detection port.

8. A two-speed four-take shutdown control device according to claim 1, wherein a stop valve is further provided between the T-port of the startup oil control valve and the oil return port, and an orifice is further provided between the stop valve and the T-port of the startup oil control valve.

9. The two-speed four-pick-up shutdown control device according to claim 1, wherein the main control module body is further provided with a combination valve as a safety device, a port P of the combination valve is communicated with the pressure oil source, a port a is communicated with the start oil port, a port B is communicated with the speed shut-off oil port, and a port T is communicated with the oil return port.

10. A two-speed four-pick-up shutdown control device according to claim 1, further comprising a support frame, wherein the main control module is fixed on the support frame, and both ends of the first oil delivery pipe and both ends of the second oil delivery pipe respectively pass through the support frame from the bottom of the main control module and then are connected to the first shutdown control module and the second shutdown control module.