Four-speed two-speed shutdown control device

Abstract

The present invention provides a four-out-of-two-speed shutdown control device, 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 and right sides of the main control module, and the first shutdown control module and the second shutdown control module are connected through an externally connected first oil pipeline and a second oil pipeline; the main control module comprises a main control module body, a starting oil control valve, a fast-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 solenoid valve, a second shutdown solenoid 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 solenoid valve, a fourth shutdown solenoid valve, a third cartridge valve and a fourth cartridge valve; the shutdown fast-closing valve group structure can be simplified under the premise of ensuring a low false trip probability, and the upgrading and transformation cost is low.

Description

Technical Field

[0001] The invention relates to a control device for a main steam valve of a steam turbine, in particular to a four-out-of-two-speed shutdown control device. Background Art

[0002] A steam turbine is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle and becomes an accelerated airflow, which is then sprayed onto the blades, causing the rotor with the blades to rotate and perform work externally. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power devices. With the continuous advancement of science and technology, mechatronics technology has become more and more developed. As one of the important machines that provide motive power, steam turbines have also been continuously developed and popularized.

[0003] The main steam inlet circuit of the steam turbine is controlled by a quick-closing control system, which is generally composed of multiple separate hydraulic control components connected by pipelines. This makes the steam turbine pipelines numerous and complex to install, making it difficult to monitor during operation and prone to oil leakage and fire accidents. At the same time, the general quick-closing control device for steam turbines often uses two shutdown solenoid valve structures to realize the remote shutdown function of the steam turbine unit. The control logic is two-out-of-one. When the steam turbine is operating normally, any one or more shutdown solenoid valves will cause the unit to trip. According to the two-out-of-one control logic design, any instrument shutdown signal channel error (signal interference or control system card failure, etc.) or any shutdown solenoid valve failure will cause the steam turbine to trip, which will bring serious hidden dangers to the normal and safe operation of the entire unit. During the operation of the unit, the smoothness of the control channel and the effective use of the solenoid valve must be guaranteed at all times. Periodic maintenance of the protection channel and manual inspection of the on-site quick-closing control device are required to ensure the normal shutdown function of the quick-closing control device and prevent the unit from tripping by mistake.

[0004] A Chinese patent with publication number CN204512043U discloses a redundant remote control shutdown control circuit for a quick-closing valve in a main steam circuit of a steam turbine. This scheme redundantly configures three branch hydraulic circuits. Only when the electromagnetic reversing valves in at least two of them fail will the unit be triggered to trip accidentally. This reduces the probability of system shutdown caused by self-switching of the electromagnetic reversing valve to a certain extent, but considering the losses caused by unexpected shutdown of the steam turbine, the probability of such a unit tripping accidentally is still relatively high.

[0005] A Chinese patent with publication number CN201372815Y discloses a quick-closing valve integrated electro-hydraulic actuator, which consists of four shutdown solenoid valves connected in series and then in parallel. Therefore, the unit will only be triggered to trip accidentally when any three shutdown solenoid valves fail or one of the two parallel oil circuits fails. Therefore, this solution further reduces the probability of system shutdown caused by self-reversal of the shutdown solenoid valve; because the two shutdown solenoid valves are connected in series and then in parallel, there are many pipelines, which reduces its reliability and makes its installation, monitoring and maintenance difficult; at the same time, the implementation of this solution requires large-scale internal structure improvements to the hydraulic control system of the turbine, and the upgrading and transformation process is cumbersome and costly.

[0006] Based on the above problems, it is necessary to improve the existing shutdown quick-closing valve group, simplify the structure of the shutdown quick-closing valve group and reduce the upgrading and transformation cost while ensuring low false tripping. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a four-out-of-two-speed shutdown control device, which can reduce the upgrading and transformation costs under the premise of ensuring a low false tripping probability.

[0008] Based on the above purpose, the present invention provides a four-out-of-two-speed shutdown control device, which includes 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 and right sides of the main control module, and the first shutdown control module and the second shutdown control module are connected through an external first oil pipeline and a second oil pipeline;

[0009] 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 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 shutdown control module, and the second unloading cartridge valve is arranged below the second shutdown control module; the P port of the starting oil control valve, the P port of the quick closing oil control valve, the first unloading cartridge valve, and the oil inlet of the second unloading cartridge valve are arranged on the front side of the main control module body, the first unloading cartridge valve is arranged below the first shutdown control module, and the second unloading cartridge valve is arranged below the second shutdown control module; the P port of the starting oil control valve, the P port of the quick closing oil control valve, the first unloading cartridge valve, and the oil inlet of the second unloading cartridge valve are arranged on the front side of the main control module body, the first unloading cartridge valve and ... and the oil outlet of the third unloading cartridge valve are all connected to the pressure oil source, the T port of the starting oil control valve, the T port of the quick-closing oil control valve, the oil outlet of the first unloading cartridge valve and the second unloading cartridge valve are all connected to the oil return port; the B port of the starting oil control valve is connected to the starting oil port of the quick-closing valve, the A port of the quick-closing oil control valve and the oil inlet of the third unloading cartridge valve are connected to the quick-closing oil port of the quick-closing valve; the B port of the quick-closing oil control valve is connected to the 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 connected to the second oil pipeline;

[0010] The first shutdown control module includes 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 arranged on the first shutdown control module body; the second shutdown control module includes 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 arranged on the second shutdown control module body; wherein: the P port of the first shutdown solenoid valve, the P port of the second shutdown solenoid valve, the P port of the third shutdown solenoid valve and the P port of the fourth shutdown solenoid valve are all connected to the pressure oil source; the T port of the first shutdown solenoid valve, the T port of the second shutdown solenoid valve, the T port of the third shutdown solenoid valve and the T port of the fourth shutdown solenoid valve are all connected to the pressure oil source; The upper chamber of the first cartridge valve is connected to the A port of the first shutdown solenoid valve, the upper chamber of the second cartridge valve is connected to the A port of the second shutdown solenoid valve, the upper chamber of the third cartridge valve is connected to the A port of the third shutdown solenoid valve, and the upper chamber of the fourth cartridge valve is connected to the A port of the fourth shutdown solenoid valve; the oil inlet of the first cartridge valve and the oil inlet of the second cartridge valve are both connected to the oil return port; the oil outlet of the first cartridge valve and the oil outlet of the second cartridge valve are both connected to the oil inlet of the third cartridge valve and the oil inlet of the fourth cartridge valve through the first oil pipeline; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and connected to the second oil pipeline; the second oil pipeline is also connected to the pressure oil source through a throttling hole;

[0011] When at least one shutdown solenoid valve in the first shutdown control module and the second shutdown control module fails, the second oil pipeline will lose pressure, thereby triggering the first unloading cartridge valve and the second unloading cartridge valve to operate, causing the fast-closing oil circuit in the fast-closing control device to lose pressure, causing the turbine fast-closing valve to close and the entire unit to shut down.

[0012] Preferably, the first shutdown solenoid valve and the second shutdown solenoid valve are both fixed to the first shutdown control module body through a first connecting block, and the third shutdown solenoid valve and the fourth shutdown solenoid valve are both fixed to the second shutdown control module body through a second connecting block.

[0013] Preferably, a manual shutdown valve is also provided on the top of the main control module body, the P port of the manual shutdown valve is connected to the pressure oil source, the T port is connected to the return oil port, and the A port is respectively connected to the P port of the first shutdown solenoid valve, the P port of the second shutdown solenoid valve, the P port of the third shutdown solenoid valve and the P port 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 reverse so that its P port and T port are connected, the pressure oil source is directly connected to the return oil port, thereby causing the quick-closing oil circuit to lose pressure, directly closing the turbine quick-closing valve and shutting down the entire unit.

[0014] Preferably, a double-headed electromagnetic reversing valve is also provided on the top of the main control module body, the P port of the double-headed electromagnetic reversing valve is connected to the pressure oil source, the T port is connected to the return oil port, and the A port and the B port are respectively connected to a test oil port.

[0015] Preferably, the upper chambers of the first cartridge valve, the second cartridge valve, the third cartridge valve and the fourth cartridge valve are respectively connected to an online oil pressure detection port for online detection of the working status of the corresponding shutdown solenoid valve.

[0016] Preferably, the pressure oil source, the starting oil port and the quick-closing oil port are each connected to an online oil pressure detection port.

[0017] Preferably, a pressure switch or a pressure transmitter is provided at the online oil pressure detection port.

[0018] Preferably, a stop valve is provided between the T port of the starting oil control valve and the oil return port, and a throttling hole is provided between the stop valve and the T port of the starting oil control valve.

[0019] Preferably, the main control module body is also provided with a combination valve as a safety device, the P port of the combination valve is connected to the pressure oil source, the A port is connected to the starting oil port, the B port is connected to the quick-closing oil port, and the T port is connected to the return oil port.

[0020] Preferably, the device also includes a support frame, on which the main control module is fixed, and both ends of the first oil pipeline and the second oil pipeline are respectively connected to the first shutdown control module and the second shutdown control module after passing through the support frame from the bottom of the main control module.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The scheme described in the present invention simplifies the structure of the shutdown quick-closing valve group while ensuring a low false trip probability, thereby improving the performance reliability of the valve group; and the first shutdown control module and the second shutdown control module are connected in oil circuits through the first external oil pipeline and the second external oil pipeline. Therefore, during the upgrade and modification process, there is no need to make pipeline changes inside the main control module of the turbine quick-closing control system, and the upgrade and modification cost is low and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0024] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0025] Figure 1 This is a pipeline connection structure diagram of a four-out-of-two-speed shutdown valve group in Embodiment 1 of the present invention;

[0026] Figure 2 This is a front view of the external structure of the four-in-two-speed shutdown valve group in the first embodiment of the present invention;

[0027] Figure 3 It is a side view of the external structure of the four-out-of-two-speed shutdown valve group in the first embodiment of the present invention;

[0028] Figure 4 It is a structural schematic diagram of a four-out-of-two-speed shutdown control system with the above-mentioned valve group in Embodiment 1 of the present invention;

[0029] Figure 5 2 is a schematic diagram of the structure of a four-out-of-two-speed shutdown control device having the above system in Embodiment 1 of the present invention;

[0030] Figure 6 It is a structural schematic diagram of a rapid shutdown system with an emergency safety device in Embodiment 1 of the present invention;

[0031] Figure 7 It is a structural schematic diagram of a rapid shutdown system with an emergency safety device in the second embodiment of the present invention.

[0032] Among them, 1. main control module; 2. first shutdown control module; 3. second shutdown control module; 4. emergency safety device; 5. first oil pipeline; 6. second oil pipeline; 7. support frame; 8. quick closing valve. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Embodiment 1

[0037] like Figure 1As shown, this embodiment first provides a four-in-two-speed shutdown valve group, which 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 oil 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 oil port K2; wherein:

[0038] 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 are all connected to the pressure oil source of the quick-closing control device; the T port of the first stop solenoid valve 2223, the T port of the second stop solenoid valve 2224, the T port of the third stop solenoid valve 2225 and the T port of the fourth stop solenoid valve 2226 are all connected to the return oil port of the quick-closing control device;

[0039] The upper chamber of the first cartridge valve is connected to the A port of the first shutdown solenoid valve 2223, the upper chamber of the second cartridge valve is connected to the A port of the second shutdown solenoid valve 2224, the upper chamber of the third cartridge valve is connected to the A port of the third shutdown solenoid valve 2225, and the upper chamber of the fourth cartridge valve is connected to the A port of the fourth shutdown solenoid valve 2226; the oil inlet of the first cartridge valve and the oil inlet of the second cartridge valve are both connected to the oil return port of the quick-closing shutdown device; Figure 2 and Figure 3 As shown, the oil outlet of the first cartridge valve and the oil outlet of the second cartridge valve are both connected to the oil inlet of the third cartridge valve and the oil inlet of the fourth cartridge valve through the first oil pipeline 5; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and connected to the second oil pipeline 6; the second oil pipeline 6 is also connected to the pressure oil source through the first throttle hole; in this way, when at least one of the shutdown solenoid valves in the first shutdown control module 2 and the second shutdown control module 3 fails, the pressure in the second oil pipeline 6 will be lost;

[0040] See also Figure 1 The first control oil port K1 and the second control oil port K2 are respectively connected to the two ends of the second oil pipeline 6, and the first control oil port K1 and the second control oil port K2 are both connected to the pressure relief valve of the quick-closing control device. When the second oil pipeline 6 loses pressure, the pressure relief valve is activated, causing the quick-closing oil circuit to lose pressure, causing the turbine quick-closing valve 8 to close and the entire unit to shut down.

[0041] As a preferred implementation scheme, 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 oil port K1 are all arranged in the first shutdown control module body;

[0042] The second shutdown control module 3 also includes 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 oil port K2 are all arranged in the second shutdown control module body;

[0043] The first oil delivery pipe 5 and the second oil delivery pipe 6 are external pipelines connected between the first shutdown control module body and the second shutdown control module body.

[0044] As a preferred implementation, 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 connected to an online detection oil port. Preferably, the online detection oil port is provided with a pressure switch or a pressure transmitter. Specifically, Figure 1 As shown, in the first shutdown control module 2, the oil ports P23 and P24 are online monitoring oil ports, where a pressure switch or pressure transmitter can be set to monitor the working status of the two shutdown solenoid valves online. The simplified version can be designed with an online monitoring port, and the working status of the shutdown solenoid valve can be detected by a detection tool or a pressure gauge configured here. In the second shutdown control module 3, the oil ports P25 and P26 are online monitoring oil ports, where a pressure switch or pressure transmitter can be set to monitor the working status of the two shutdown solenoid valves online. The simplified version can be designed with an online monitoring port, and the working status of the shutdown solenoid valve can be detected by a detection tool or a pressure gauge configured here.

[0045] As a preferred implementation scheme, 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 use solenoid valves with position switches, and the working status of the shutdown solenoid valve is determined by monitoring the position of the solenoid valve core.

[0046] like Figure 4 As shown, the present embodiment also provides a four-out-of-two-speed shutdown control system using the above-mentioned four-out-of-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, the main control module 1 includes a starting oil control valve 1843, a quick-off oil control valve 1842, a first unloading cartridge valve, a second unloading cartridge valve and a third unloading cartridge valve; wherein, the starting oil control valve 1843 is used to establish the starting oil (F), and the quick-off oil control valve 1842 is used to establish the quick-off oil (E2); the first shutdown control module 2 includes a first shutdown solenoid valve 2223, a second shutdown solenoid valve 2224, a first cartridge valve and a second cartridge valve, and the second shutdown control module 3 includes a third shutdown solenoid valve 2225, a fourth shutdown solenoid valve 2226, a third cartridge valve and a fourth cartridge valve; wherein:

[0047] The P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225 and the P port of the fourth shutdown solenoid valve 2226 are all connected to the 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 connected to the oil return port;

[0048] The upper chamber of the first cartridge valve is connected to the A port of the first shutdown solenoid valve 2223, the upper chamber of the second cartridge valve is connected to the A port of the second shutdown solenoid valve 2224, the upper chamber of the third cartridge valve is connected to the A port of the third shutdown solenoid valve 2225, and the upper chamber of the fourth cartridge valve is connected to the A port of the fourth shutdown solenoid valve 2226; the oil inlet of the first cartridge valve and the oil inlet of the second cartridge valve are both connected to the oil return port; the oil outlet of the first cartridge valve and the oil outlet of the second cartridge valve are both connected to the oil inlet of the third cartridge valve and the oil inlet of the fourth cartridge valve through the first oil pipeline 5; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and connected to the second oil pipeline 6; the second oil pipeline 6 is also connected to the pressure oil source through a throttling hole; when at least one of the shutdown solenoid valves in the first shutdown control module 2 and the second shutdown control module 3 fails, the second oil pipeline 6 will lose pressure;

[0049] The upper chamber of the first unloading cartridge valve and the upper chamber of the second unloading cartridge valve are both connected to the second oil delivery 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 inlet of the first unloading cartridge valve, the second unloading cartridge valve and the oil outlet of the third unloading cartridge valve are all connected to the 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 connected to the return oil The B port of the starting oil control valve 1843 is connected with the starting oil port of the quick-closing valve 8, and the A port of the quick-closing oil control valve 1842 and the oil inlet of the third unloading cartridge valve are connected with the quick-closing oil port of the quick-closing valve 8; the B port of the quick-closing oil control valve 1842 is connected with the upper cavity of the third unloading cartridge valve; when the second oil pipeline 6 loses pressure, the first unloading cartridge valve and the second unloading cartridge valve are actuated, causing the quick-closing oil circuit to lose pressure, causing the turbine quick-closing valve 8 to close and the entire unit to shut down.

[0050] As a preferred implementation scheme, the main control module 1 also includes a manual shutdown valve 2250 for manually shutting down the steam turbine. The P port of the manual shutdown valve 2250 is connected to the pressure oil source, the T port is connected to the oil return port, and the A port is respectively connected to the P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225, and the 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. When the manual shutdown valve 2250 is manually controlled to be reversed so that its P port and T port are connected, the pressure oil source is directly connected to the oil return port, so that the quick-closing oil circuit loses pressure, directly closes the turbine quick-closing valve 8, and shuts down the entire unit.

[0051] As a preferred implementation scheme, the main control module 1 also includes a double-headed solenoid reversing valve 2309, the P port of the double-headed solenoid reversing valve 2309 is connected to the pressure oil source, the T port is connected to the return oil port, and the A port and the B port are respectively connected to a test oil port to realize the control of the turbine fast closing valve test oil H1 / H2.

[0052] As a preferred implementation scheme, the upper chambers of the first cartridge valve, the second cartridge valve, the third cartridge valve and the fourth cartridge valve are respectively connected to an online oil pressure detection port for online detection of the working status of the corresponding shutdown solenoid valve.

[0053] As a preferred implementation scheme, the pressure oil source, the starting oil port and the quick-closing oil port are each connected to an online oil pressure detection port.

[0054] As a preferred implementation scheme, a pressure switch is provided at the online oil pressure detection port.

[0055] As a preferred implementation scheme, a pressure transmitter is provided at the online oil pressure detection port.

[0056] As a preferred implementation scheme, a stop valve is further provided between the T port of the starting oil control valve 1843 and the oil return port, and a throttling hole is further provided between the stop valve and the T port of the starting oil control valve 1843.

[0057] As a preferred implementation scheme, 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 are all solenoid valves with position switches.

[0058] As a preferred implementation scheme, the main control module 1 also includes a combination valve 2200 as a safety device, the P port of the combination valve 2200 is connected to the pressure oil source, the A port is connected to the starting oil port, the B port is connected to the quick-closing oil port, and the T port is connected to the return oil port.

[0059] The above scheme simplifies the structure of the shutdown quick-closing valve group while ensuring a low false tripping probability, thereby improving the performance reliability of the valve group; and the first shutdown control module and the second shutdown control module are connected in the oil circuit through the external first oil pipeline and the second oil pipeline. Therefore, during the upgrade and modification process, there is no need to make pipeline changes inside the main control module of the turbine quick-closing control system, and the upgrade and modification cost is low and the practicability is strong.

[0060] like Figure 5 As shown, the present embodiment also provides a four-out-of-two-speed shutdown control device using the above-mentioned four-out-of-two-speed shutdown valve group, the device comprising 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 arranged 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 connected through an external first oil pipeline 5 and a second oil pipeline 6;

[0061] The main control module 1 includes 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 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 shutdown control module 2, and the second unloading cartridge valve is arranged below the second shutdown 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 first unloading cartridge valve, the second unloading cartridge valve are arranged below the second shutdown control module 3; The oil port and the oil outlet of the third unloading cartridge valve are all connected to the 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 connected to the oil return port; the B port of the starting oil control valve 1843 is connected to the starting oil port of the quick-closing valve 8, the A port of the quick-closing oil control valve 1842 and the oil inlet of the third unloading cartridge valve are connected to the quick-closing oil port of the quick-closing valve 8; the B port of the quick-closing oil control valve 1842 is connected to the 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 connected to the second oil pipeline 6;

[0062] The first shutdown control module 2 includes a first shutdown control module body and a first shutdown solenoid valve 2223, a second shutdown solenoid valve 2224, a first cartridge valve and a second cartridge valve arranged on the first shutdown control module body, and the second shutdown control module 3 includes a second shutdown control module body and a third shutdown solenoid valve 2225, a fourth shutdown solenoid valve 2226, a third cartridge valve and a fourth cartridge valve arranged on the second shutdown control module body; wherein: the P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225 and the P port of the fourth shutdown solenoid valve 2226 are all connected to the 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 connected to the oil return port; the upper chamber of the first cartridge valve is connected to the A port of the first shutdown solenoid valve 2223, the upper chamber of the second cartridge valve is connected to the A port of the second shutdown solenoid valve 2224, the upper chamber of the third cartridge valve is connected to the A port of the third shutdown solenoid valve 2225, and the upper chamber of the fourth cartridge valve is connected to the A port of the fourth shutdown solenoid valve 2226; the oil inlet of the first cartridge valve and the oil inlet of the second cartridge valve are both connected to the oil return port; the oil outlet of the first cartridge valve and the oil outlet of the second cartridge valve are both connected to the oil inlet of the third cartridge valve and the oil inlet of the fourth cartridge valve through the first oil pipeline 5; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and connected to the second oil pipeline 6; the second oil pipeline 6 is also connected to the pressure oil source through a throttling hole;

[0063] When at least one of the shutdown solenoid valves in the first shutdown control module 2 and the second shutdown control module 3 fails, the second oil pipeline 6 will lose pressure, thereby triggering the first unloading cartridge valve and the second unloading cartridge valve to operate, causing the fast-closing oil circuit in the fast-closing control device to lose pressure, causing the turbine fast-closing valve 8 to close and the entire unit to shut down.

[0064] As a preferred implementation scheme, the first shutdown solenoid valve 2223 and the second shutdown solenoid valve 2224 are both fixed to the first shutdown control module body through the 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 the second connecting block. Preferably, each valve body and each shutdown module, each valve body and the main control module 1, and each shutdown module and the main control module 1 are sealed by a sealing ring. In this way, the individual components of the existing steam turbine safety and control system are combined together, and the sealing effect is achieved by using a sealing ring, which overcomes the defects of the traditional steam turbine with numerous pipelines and complex installation, making the steam turbine easy to monitor during operation, preventing the occurrence of oil leakage and fire accidents, and increasing the reliability and safety of the steam turbine operation.

[0065] As a preferred implementation scheme, a manual shutdown valve 2250 is also provided on the top of the main control module body, the P port of the manual shutdown valve 2250 is connected to the pressure oil source, the T port is connected to the return oil port, and the A port is respectively connected to the P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225 and the 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. When the manual shutdown valve 2250 is manually controlled to reverse so that its P port and T port are connected, the pressure oil source is directly connected to the return oil port, thereby causing the quick-closing oil circuit to lose pressure, directly closing the turbine quick-closing valve 8 and shutting down the entire unit.

[0066] As a preferred implementation scheme, a double-headed electromagnetic reversing valve 2309 is also provided on the top of the main control module body, the P port of the double-headed electromagnetic reversing valve 2309 is connected to the pressure oil source, the T port is connected to the return oil port, and the A port and the B port are respectively connected to a test oil port.

[0067] As a preferred implementation scheme, the upper chambers of the first cartridge valve, the second cartridge valve, the third cartridge valve and the fourth cartridge valve are respectively connected to an online oil pressure detection port for online detection of the working status of the corresponding shutdown solenoid valve.

[0068] As a preferred implementation scheme, the pressure oil source, the starting oil port and the quick-closing oil port are each connected to an online oil pressure detection port.

[0069] As a preferred implementation scheme, a pressure switch or a pressure transmitter is provided at the online oil pressure detection port.

[0070] As a preferred implementation scheme, a stop valve is further provided between the T port of the starting oil control valve 1843 and the oil return port, and a throttling hole is further provided between the stop valve and the T port of the starting oil control valve 1843.

[0071] As a preferred implementation scheme, the main control module body is also provided with a combination valve 2200 as a safety device, the P port of the combination valve 2200 is connected to the pressure oil source, the A port is connected to the starting oil port, the B port is connected to the quick-closing oil port, and the T port is connected to the return oil port.

[0072] As a preferred implementation scheme, the device also includes a support frame 7, and the main control module 1 is fixed on the support frame 7. The two ends of the first oil pipeline 5 and the second oil pipeline 6 are respectively connected to the first shutdown control module 2 and the second shutdown control module 3 after passing through the support frame 7 from the bottom of the main control module 1.

[0073] The above scheme is mainly used for opening and closing the quick-closing valve of the steam turbine, remote start, local and remote shutdown, online test of the quick-closing valve, direct connection with the electro-hydraulic converter, online pressure measurement of the pressure gauge, etc. The system has the characteristics of compact structure, convenient operation, safety and reliability. The operation process is as follows:

[0074] Open the quick-closing valve

[0075] At the same time, the quick-closing oil control valve 1842 and the starting oil solenoid valve 1843 are energized, the P port and the B port of the starting oil solenoid valve 1843 are connected, the starting oil F is established, and the cartridge valve under the combination valve 2200 is opened. At this time, the P port and the B port of the quick-closing oil control valve 1842 are connected, so that the other third unloading cartridge valve is closed, and the pressure oil P and E2 channels are cut off. After about 20 seconds, the solenoid reversing valve 1842 is de-energized, and the pressure oil P is connected to E2, and the quick-closing oil E2 is established. After about 20 seconds, the starting oil solenoid valve 1843 is de-energized, and the starting oil is connected to the return oil port. Because the return oil port of the starting oil solenoid valve 1843 is equipped with a throttling orifice plate and an adjustable flow needle valve, the starting oil returns slowly and can be adjusted to control the opening speed of the quick-closing valve. At this time, the quick-closing valve opens slowly.

[0076] Quick closing valve test

[0077] When the quick-closing valve is opened, the state of the double-headed electromagnetic reversing valve 2309 is switched to make H1 or H2 conduct with the pressure oil P, and the quick-closing valve is tested online. The test is stopped and the double-headed electromagnetic reversing valve 2309 is restored to the default position. Because of the throttling orifice, the partial displacement and reset action of the quick-closing valve are slow, and the quick-closing valve will not be closed.

[0078] This embodiment also provides a four-out-of-two-speed shutdown control device with an emergency safety device, such as Figure 5 and Figure 6 As shown, the device includes a main control module 1, a first shutdown control module 2, a second shutdown control module 3 and an emergency protection module 4, wherein the first shutdown control module 2 and the second shutdown control module 3 are respectively arranged 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 connected through an external first oil pipeline 5 and a second oil pipeline 6, and the emergency protection module 4 is arranged on the turbine shaft;

[0079] The main control module 1 includes 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 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 shutdown control module 2, and the second unloading cartridge valve is arranged below the second shutdown 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 first unloading cartridge valve, the second unloading cartridge valve are arranged below the second shutdown control module 3; The oil port and the oil outlet of the third unloading cartridge valve are all connected to the 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 connected to the oil return port; the B port of the starting oil control valve 1843 is connected to the starting oil port of the quick-closing valve 8, the A port of the quick-closing oil control valve 1842 and the oil inlet of the third unloading cartridge valve are connected to the quick-closing oil port of the quick-closing valve 8; the B port of the quick-closing oil control valve 1842 is connected to the 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 connected to the second oil pipeline 6;

[0080] The first shutdown control module 2 includes a first shutdown control module 2 body and a first shutdown solenoid valve 2223, a second shutdown solenoid valve 2224, a first cartridge valve and a second cartridge valve arranged on the first shutdown control module 2 body; the second shutdown control module 3 includes a second shutdown control module 3 body and a third shutdown solenoid valve 2225, a fourth shutdown solenoid valve 2226, a third cartridge valve and a fourth cartridge valve arranged on the second shutdown control module 3 body; wherein: the P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225 and the P port of the fourth shutdown solenoid valve 2226 are all connected to the 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 The T port and the T port of the fourth shutdown solenoid valve 2226 are both connected to the oil return port; the upper chamber of the first cartridge valve is connected to the A port of the first shutdown solenoid valve 2223, the upper chamber of the second cartridge valve is connected to the A port of the second shutdown solenoid valve 2224, the upper chamber of the third cartridge valve is connected to the A port of the third shutdown solenoid valve 2225, and the upper chamber of the fourth cartridge valve is connected to the A port of the fourth shutdown solenoid valve 2226; the oil inlet of the first cartridge valve and the oil inlet of the second cartridge valve are both connected to the oil return port; the oil outlet of the first cartridge valve and the oil outlet of the second cartridge valve are both connected to the oil inlet of the third cartridge valve and the oil inlet of the fourth cartridge valve through the first oil pipeline 5; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and connected to the second oil pipeline 6; the second oil pipeline 6 is also connected to the pressure oil source through a throttling hole;

[0081] When at least one of the shutdown solenoid valves in the first shutdown control module 2 and the second shutdown control module 3 fails, the second oil pipeline 6 will lose pressure, thereby triggering the first unloading cartridge valve and the second unloading cartridge valve to operate, causing the fast-closing oil circuit in the fast-closing control device to lose pressure, causing the turbine fast-closing valve 8 to close and the entire unit to shut down;

[0082] The E0 oil port of the main control module 1 is connected to the emergency safety device 4, and another pressure oil source passes through the emergency safety device 4 and then through the E0 oil port to the quick-closing oil control valve 18421842 and the third cartridge valve provided on the front side of the main control module 1 to establish quick-closing oil (E2). The emergency safety module includes an emergency safety valve and a fly hammer arranged on the turbine shaft, the P port of the emergency safety valve is connected to the pressure oil source; the B port is connected to the quick-closing oil circuit; the T port is connected to the return oil port; the A port is connected to the B port, and the A port is the switch oil control end of the emergency safety valve; the bottom of the fly hammer is pressed on the spring seat by a spring, and the spring seat is fixed on the emergency safety valve. When the rotation speed or shaft displacement of the turbine shaft exceeds the mechanical set value, the fly hammer is hit and the centrifugal force pops out, or the rotor shoulder part hits the control end of the emergency safety valve, driving the emergency safety valve to operate, so that the pressure oil source is directly connected to the return oil port, thereby releasing the pressure of the quick-closing oil, causing the turbine quick-closing valve 8 to close and the entire unit to shut down.

[0083] As a preferred implementation scheme, 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.

[0084] As a preferred implementation scheme, a manual shutdown valve is also provided on the top of the main control module body, the P port of the manual shutdown valve is connected to the pressure oil source, the T port is connected to the return oil port, and the A port is respectively connected to the P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225 and the P port of the fourth shutdown solenoid valve 2226, so that the manual shutdown valve is connected in series between the pressure oil source and the first shutdown control module 2 and the second shutdown control module 3. When the manual shutdown valve is manually controlled to reverse its P port and T port, the pressure oil source is directly connected to the return oil port, thereby causing the quick-closing oil circuit to lose pressure, directly closing the turbine quick-closing valve 8 and shutting down the entire unit.

[0085] As a preferred implementation scheme, a double-headed electromagnetic reversing valve is also provided on the top of the main control module body, the P port of the double-headed electromagnetic reversing valve is connected to the pressure oil source, the T port is connected to the return oil port, and the A port and the B port are respectively connected to a test oil port; throttling holes are provided between the A port and the test oil port, and between the B port and the test oil port of the double-headed electromagnetic reversing valve.

[0086] As a preferred implementation scheme, the upper chambers of the first cartridge valve, the second cartridge valve, the third cartridge valve and the fourth cartridge valve are respectively connected to an online oil pressure detection port for online detection of the working status of the corresponding shutdown solenoid valve.

[0087] As a preferred implementation scheme, the pressure oil source, the starting oil port and the quick-closing oil port are each connected to an online oil pressure detection port.

[0088] As a preferred implementation scheme, a pressure switch or a pressure transmitter is provided at the online oil pressure detection port.

[0089] As a preferred implementation scheme, a stop valve is further provided between the T port of the starting oil control valve 1843 and the oil return port, and a second throttling hole is further provided between the stop valve and the T port of the starting oil control valve 1843.

[0090] As a preferred implementation scheme, the main control module body is also provided with a combination valve as a safety device, the P port of the combination valve is connected to the pressure oil source, the A port is connected to the starting oil port, the B port is connected to the quick-closing oil port, and the T port is connected to the return oil port.

[0091] As a preferred implementation scheme, the device also includes a support frame, on which the main control module is fixed, and both ends of the first oil pipeline 5 and the second oil pipeline 6 are respectively connected to the first shutdown control module 2 and the second shutdown control module 3 after passing through the support frame from the bottom of the main control module.

[0092] The above scheme is mainly used for opening and closing the quick-closing valve of the steam turbine, remote start, local and remote shutdown, online test of the quick-closing valve, direct connection with the electro-hydraulic converter, online pressure measurement of the pressure gauge, etc. The system has the characteristics of compact structure, convenient operation, safety and reliability. The operation process is as follows:

[0093] Open the quick-closing valve

[0094] At the same time, the electromagnetic reversing valves 1842 and 1843 are energized, the P port and the B port of the electromagnetic reversing valve 1843 are connected, the starting oil F is established, and the DG16 cartridge valve under the combination valve 2200 is opened. At this time, the P port and the B port of the electromagnetic reversing valve 1842 are connected, so that the other DG16 cartridge valve is closed, and the pressure oil P and E2 channels are cut off. After about 20 seconds, the electromagnetic reversing valve 1842 is de-energized, and the pressure oil P is connected to E2, and the quick-closing oil E2 is established. After about 20 seconds, the electromagnetic reversing valve 1843 is de-energized, and the starting oil is connected to the return oil port. Because the return oil port of the electromagnetic reversing valve 1843 is equipped with a throttling orifice plate and an adjustable flow needle valve, the starting oil returns slowly and can be adjusted to control the opening speed of the quick-closing valve. At this time, the quick-closing valve slowly opens.

[0095] Furthermore, if Figure 6 As shown, this embodiment also provides a fast shutdown control system with an emergency safety device, the system includes a main control module, a first shutdown control module, a second shutdown control module and an emergency safety module, wherein:

[0096] The main control module includes 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; wherein the P port of the starting oil control valve 1843, the P port of the quick-closing oil control valve 1842, the oil inlet of the first unloading cartridge valve, the second unloading cartridge valve and the oil outlet of the third unloading cartridge valve are all connected to the 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 first unloading cartridge valve, the oil inlet of the second unloading cartridge valve and the oil outlet of the third unloading cartridge valve are all connected to the pressure oil source. The oil outlets of the loading cartridge valve and the second unloading cartridge valve are both connected to the oil return port; the B port of the starting oil control valve 1843 is connected to the starting oil port of the quick closing valve, the A port of the quick closing oil control valve 1842 and the oil inlet of the third unloading cartridge valve are connected to the quick closing oil port of the quick closing valve; the B port of the quick closing oil control valve 1842 is connected to the upper cavity of the third unloading cartridge valve; the upper cavity of the first unloading cartridge valve is connected to the first shutdown control module, and the upper cavity of the second unloading cartridge valve is connected to the second shutdown control module;

[0097] At least one shutdown solenoid valve is provided in each of the first shutdown control module and the second shutdown control module. When at least one shutdown solenoid valve in the first shutdown control module and the second shutdown control module fails, the first unloading cartridge valve and the second unloading cartridge valve are triggered to act, causing the fast closing oil circuit in the fast closing control device to lose pressure, causing the turbine fast closing valve to close and the entire unit to shut down;

[0098] The emergency safety module includes an emergency safety valve and a fly hammer arranged on the turbine shaft, the P end of the emergency safety valve is connected to the pressure oil source; the B end is connected to the quick-closing oil circuit; the T port is connected to the return oil port; the A port is connected to the B port, and the A port is the switch oil control end of the emergency safety valve; the bottom of the fly hammer is pressed on the spring seat by a spring, and the spring seat is fixed on the emergency safety valve. When the speed or shaft displacement of the turbine shaft exceeds the mechanical set value, the fly hammer is ejected by the centrifugal force due to the excessive speed or the rotor shoulder hits the control end of the emergency safety valve, driving the emergency safety valve to operate, so that the pressure oil source is directly connected to the return oil port, thereby depressurizing the quick-closing oil, causing the turbine quick-closing valve to close and the entire unit to shut down.

[0099] As a preferred implementation scheme, the first shutdown control module includes a first shutdown solenoid valve 2223, a second shutdown solenoid valve 2224, a first cartridge valve and a second cartridge valve, and the second shutdown control module includes a third shutdown solenoid valve 2225, a fourth shutdown solenoid valve 2226, a third cartridge valve and a fourth cartridge valve; wherein: the P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225 and the P port of the fourth shutdown solenoid valve 2226 are all connected to the 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 connected to the return oil port connected; the upper chamber of the first cartridge valve is connected to the A port of the first shutdown solenoid valve 2223, the upper chamber of the second cartridge valve is connected to the A port of the second shutdown solenoid valve 2224, the upper chamber of the third cartridge valve is connected to the A port of the third shutdown solenoid valve 2225, and the upper chamber of the fourth cartridge valve is connected to the A port of the fourth shutdown solenoid valve 2226; the oil inlet of the first cartridge valve and the oil inlet of the second cartridge valve are both connected to the oil return port; the oil outlet of the first cartridge valve and the oil outlet of the second cartridge valve are both connected to the oil inlet of the third cartridge valve and the oil inlet of the fourth cartridge valve through the first oil pipeline; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and connected to the second oil pipeline; the second oil pipeline is also connected to the pressure oil source through a throttling hole.

[0100] As a preferred implementation scheme, a manual shutdown valve 2250 is also provided in the main control module, and the P port of the manual shutdown valve 2250 is connected to the pressure oil source, the T port is connected to the return oil port, and the A port is respectively connected to the P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225 and the 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. When the manual shutdown valve 2250 is manually controlled to reverse so that its P port and T port are connected, the pressure oil source is directly connected to the return oil port, thereby causing the quick-closing oil circuit to lose pressure, directly closing the turbine quick-closing valve and shutting down the entire unit.

[0101] As a preferred implementation scheme, a double-headed electromagnetic reversing valve 2309 is also provided in the main control module, the P port of the double-headed electromagnetic reversing valve 2309 is connected to the pressure oil source, the T port is connected to the return oil port, the A port and the B port are respectively connected to a test oil port, and the test oil port is connected to an online oil pressure detection port.

[0102] As a preferred implementation scheme, throttling holes are provided between the A port and the B port of the double-headed electromagnetic reversing valve 2309 and the test oil port.

[0103] As a preferred implementation scheme, the upper chambers of the first cartridge valve, the second cartridge valve, the third cartridge valve and the fourth cartridge valve are respectively connected to an online oil pressure detection port for online detection of the working status of the corresponding shutdown solenoid valve.

[0104] As a preferred implementation scheme, the pressure oil source, the starting oil port and the quick-closing oil port are each connected to an online oil pressure detection port.

[0105] As a preferred implementation scheme, a pressure switch or a pressure transmitter is provided at the online oil pressure detection port.

[0106] As a preferred implementation scheme, a stop valve is further provided between the T port of the starting oil control valve 1843 and the oil return port, and a throttling hole is further provided between the stop valve and the T port of the starting oil control valve 1843.

[0107] Need to explain, Figure 1-Figure 3 P23-P25 and Figure 4 , Figure 6 and Figure 7 P03 and P04 are online oil pressure detection ports.

[0108] The above scheme is mainly used for opening and closing the quick-closing valve of the steam turbine, remote start, local and remote shutdown, online test of the quick-closing valve, direct connection with the electro-hydraulic converter, online pressure measurement of the pressure gauge, etc. The system has the characteristics of compact structure, convenient operation, safety and reliability. The operation process is as follows:

[0109] Open the quick-closing valve

[0110] At the same time, the quick-closing oil control valve 1842 and the starting oil solenoid valve 1843 are energized, and the P port and the B port of the starting oil solenoid valve 1843 are connected to establish the starting oil F. At this time, the P port and the B port of the quick-closing oil control valve 1842 are connected, so that the other third unloading cartridge valve is closed, and the pressure oil P and E2 channels are cut off. After about 20 seconds, the electromagnetic reversing valve 1842 is de-energized, and the pressure oil P is connected to E2, and the quick-closing oil E2 is established. After about 20 seconds, the starting oil solenoid valve 1843 is de-energized, and the starting oil is connected to the return oil port. Because the return oil port of the starting oil solenoid valve 1843 is equipped with a throttling orifice plate and an adjustable flow needle valve, the starting oil returns slowly and can be adjusted to control the opening speed of the quick-closing valve. At this time, the quick-closing valve slowly opens.

[0111] Quick closing valve test

[0112] When the quick-closing valve is opened, the state of the double-headed electromagnetic reversing valve 2309 is switched to make H1 or H2 conduct with the pressure oil P, and the quick-closing valve is tested online. The test is stopped and the double-headed electromagnetic reversing valve 2309 is restored to the default position. Because of the throttling orifice, the partial displacement and reset action of the quick-closing valve are slow, and the quick-closing valve will not be closed.

[0113] Emergency Stop

[0114] Remote shutdown is achieved through electromagnetic reversing valves 2223, 2224, 2225, and 2226. When at least one of the electromagnetic reversing valves 2223 and 2224 of the first shutdown control module 2 and at least one of the electromagnetic reversing valves 2225 and 2226 of the second shutdown control module 3 are actuated, the corresponding cartridge valve is rapidly opened under the action of the spring force, the quick-closing oil is connected to the return oil, and the quick-closing valve 8 is instantly closed under the action of its spring force. Manual shutdown is achieved through the manual reversing valve 2250. The safety device of the manual shutdown valve 2250 is opened, and the handle of the manual shutdown valve 2250 is pushed forward, and the quick-closing valve is rapidly closed.

[0115] Overspeed or excessive shaft displacement shutdown

[0116] When the actual speed of the rotating machinery (steam turbine shaft) exceeds the mechanical setting value, the hammer on the rotor flies out and quickly hits the hammer of the emergency safety device, causing it to pop out, so that the emergency safety device is activated to quickly release the pressure in the oil circuit, and the quick-closing valve is quickly closed. Similarly, when the shaft displacement of the rotating machinery (steam turbine shaft) is too large, the convex shoulder on the rotor hits the hammer of the emergency safety device, causing it to pop out, so that the emergency safety device is activated to quickly release the pressure in the oil circuit, and the quick-closing valve is quickly closed.

[0117] Secondary oil regulation

[0118] It is connected to an electro-hydraulic converter (not shown in the drawings) through an oil port, and the quick-closing oil is converted into secondary oil by the electro-hydraulic converter and then output.

[0119] The present invention is connected to an electro-hydraulic converter (the present invention does not include this component) through oil ports A and B, etc. The quick-closing oil is converted into secondary oil by the electro-hydraulic converter and then output through ports C1 or C2.

[0120] The above scheme can realize the overspeed shutdown of the steam turbine, effectively avoiding the problem of equipment damage due to overspeed or excessive shaft displacement, making it easier to monitor the condition of the steam turbine during operation, preventing oil leakage and fire accidents, and increasing the reliability and safety of the unit operation.

[0121] Embodiment 2

[0122] The structures of the first shutdown control module and the second shutdown control module of this embodiment are different from those of the first embodiment. Specifically, this embodiment also provides a fast shutdown control system with an emergency safety device. Figure 7As shown,

[0123] The first shutdown control module 2 includes a first shutdown solenoid valve 2223, and the second shutdown control module 3 includes a third shutdown solenoid valve 2225, wherein the P port of the first shutdown solenoid valve 2223 and the P port of the third shutdown solenoid valve 2225 are both connected to the pressure oil source, the T port of the first shutdown solenoid valve 2223 and the T port of the third shutdown solenoid valve 2225 are both connected to the return oil port, the B port of the first shutdown solenoid valve 2223 is connected to the upper cavity of the first unloading cartridge valve, and the B port of the third shutdown solenoid valve 2225 is connected to the upper cavity of the second unloading cartridge valve, so that when the first shutdown solenoid valve 2223 and the second shutdown solenoid valve 2224 lose power at the same time, the first unloading cartridge valve and the second unloading cartridge valve are triggered to act.

[0124] As a preferred implementation scheme, a manual shutdown valve 2250 is also provided in the main control module 1, and the P port of the manual shutdown valve 2250 is connected to the pressure oil source, the T port is connected to the return oil port, and the A port is respectively connected to the P port of the first shutdown solenoid valve 2223, the P port of the second shutdown solenoid valve 2224, the P port of the third shutdown solenoid valve 2225 and the 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. When the manual shutdown valve 2250 is manually controlled to reverse so that its P port and T port are connected, the pressure oil source is directly connected to the return oil port, thereby causing the quick-closing oil circuit to lose pressure, directly closing the turbine quick-closing valve 8 and shutting down the entire unit.

[0125] As a preferred implementation scheme, a double-headed electromagnetic reversing valve 2309 is also provided in the main control module 1, and the P port of the double-headed electromagnetic reversing valve 2309 is connected to the pressure oil source, the T port is connected to the return oil port, and the A port and the B port are respectively connected to a test oil port, and the test oil port is connected to an online oil pressure detection port.

[0126] As a preferred implementation scheme, throttling holes are provided between the A port and the B port of the double-headed electromagnetic reversing valve 2309 and the test oil port.

[0127] As a preferred implementation scheme, the upper chambers of the first cartridge valve, the second cartridge valve, the third cartridge valve and the fourth cartridge valve are respectively connected to an online oil pressure detection port for online detection of the working status of the corresponding shutdown solenoid valve.

[0128] As a preferred implementation scheme, the pressure oil source, the starting oil port and the quick-closing oil port are each connected to an online oil pressure detection port.

[0129] As a preferred implementation scheme, a pressure switch or a pressure transmitter is provided at the online oil pressure detection port.

[0130] As a preferred implementation scheme, a stop valve is further provided between the T port of the starting oil control valve 1843 and the oil return port, and a throttling hole is further provided between the stop valve and the T port of the starting oil control valve 1843.

[0131] In summary, the present invention can realize the shutdown of the steam turbine due to overspeed or excessive displacement, effectively avoid the problem of overspeed or excessive shaft displacement, make it easier to monitor the condition of the steam turbine during operation, prevent the occurrence of oil leakage and fire accidents, and increase the reliability and safety of the unit operation.

[0132] The scheme described in the present invention simplifies the structure of the shutdown quick-closing valve group while ensuring a low false trip probability, thereby improving the performance reliability of the valve group; and the first shutdown control module and the second shutdown control module are connected in oil circuits through the first external oil pipeline and the second external oil pipeline. Therefore, during the upgrade and modification process, there is no need to make pipeline changes inside the main control module of the turbine quick-closing control system, and the upgrade and modification cost is low and the practicability is strong.

[0133] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A four-speed two-speed shutdown control device, characterized in that: It includes 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 and right sides of the main control module, and the first shutdown control module and the second shutdown control module are connected through an external first oil pipeline and a second oil pipeline; 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 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 shutdown control module, and the second unloading cartridge valve is arranged below the second shutdown control module; the P port of the starting oil control valve, the P port of the quick closing oil control valve, the first unloading cartridge valve, and the oil inlet of the second unloading cartridge valve are arranged on the front side of the main control module body, the first unloading cartridge valve is arranged below the first shutdown control module, and the second unloading cartridge valve is arranged below the second shutdown control module; the P port of the starting oil control valve, the P port of the quick closing oil control valve, the first unloading cartridge valve, and the oil inlet of the second unloading cartridge valve are arranged on the front side of the main control module body, the first unloading cartridge valve and ... and the oil outlet of the third unloading cartridge valve are all connected to the pressure oil source, the T port of the starting oil control valve, the T port of the quick-closing oil control valve, the oil outlet of the first unloading cartridge valve and the second unloading cartridge valve are all connected to the oil return port; the B port of the starting oil control valve is connected to the starting oil port of the quick-closing valve, the A port of the quick-closing oil control valve and the oil inlet of the third unloading cartridge valve are connected to the quick-closing oil port of the quick-closing valve; the B port of the quick-closing oil control valve is connected to the 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 connected to the second oil pipeline; The first shutdown control module includes 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 arranged on the first shutdown control module body; the second shutdown control module includes 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 arranged on the second shutdown control module body; wherein: the P port of the first shutdown solenoid valve, the P port of the second shutdown solenoid valve, the P port of the third shutdown solenoid valve and the P port of the fourth shutdown solenoid valve are all connected to the pressure oil source; the T port of the first shutdown solenoid valve, the T port of the second shutdown solenoid valve, the T port of the third shutdown solenoid valve and the T port of the fourth shutdown solenoid valve are all connected to the pressure oil source; The upper chamber of the first cartridge valve is connected to the A port of the first shutdown solenoid valve, the upper chamber of the second cartridge valve is connected to the A port of the second shutdown solenoid valve, the upper chamber of the third cartridge valve is connected to the A port of the third shutdown solenoid valve, and the upper chamber of the fourth cartridge valve is connected to the A port of the fourth shutdown solenoid valve; the oil inlet of the first cartridge valve and the oil inlet of the second cartridge valve are both connected to the oil return port; the oil outlet of the first cartridge valve and the oil outlet of the second cartridge valve are both connected to the oil inlet of the third cartridge valve and the oil inlet of the fourth cartridge valve through the first oil pipeline; the oil outlet of the third cartridge valve and the oil outlet of the fourth cartridge valve are connected in parallel and connected to the second oil pipeline; the second oil pipeline is also connected to the pressure oil source through a throttling hole; When at least one of the shutdown solenoid valves in the first shutdown control module and the second shutdown control module fails, the second oil pipeline loses pressure, thereby triggering the first unloading cartridge valve and the second unloading cartridge valve to operate, causing the fast-closing oil circuit in the fast-closing shutdown control device to lose pressure, causing the turbine fast-closing valve to close and the entire unit to shut down; The pressure oil source, the starting oil port and the quick-closing oil port are each connected to an online oil pressure detection port; The main control module body is also provided with a combination valve as a safety device, the P port of the combination valve is connected to the pressure oil source, the A port is connected to the starting oil port, the B port is connected to the quick-closing oil port, and the T port is connected to the return oil port.

2. A four-speed two-speed shutdown control device according to claim 1, characterized in that: The first shutdown solenoid valve and the second shutdown solenoid valve are both fixed to the first shutdown control module body through a first connecting block, and the third shutdown solenoid valve and the fourth shutdown solenoid valve are both fixed to the second shutdown control module body through a second connecting block.

3. The four-speed two-speed shutdown control device according to claim 1 is characterized in that: A manual shutdown valve is also provided on the top of the main control module body, wherein the P port of the manual shutdown valve is connected to the pressure oil source, the T port is connected to the return oil port, and the A port is respectively connected to the P port of the first shutdown solenoid valve, the P port of the second shutdown solenoid valve, the P port of the third shutdown solenoid valve and the P port 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 reverse so that its P port and T port are connected, the pressure oil source is directly connected to the return oil port, thereby causing the quick-closing oil circuit to lose pressure, directly closing the turbine quick-closing valve and shutting down the entire unit.

4. The four-speed two-speed shutdown control device according to claim 1 is characterized in that: A double-headed electromagnetic reversing valve is also arranged on the top of the main control module body, wherein the P port of the double-headed electromagnetic reversing valve is connected to the pressure oil source, the T port is connected to the return oil port, and the A port and the B port are respectively connected to a test oil port.

5. The four-out-of-two-speed shutdown control device according to claim 1 is characterized in that: The upper chambers of the first cartridge valve, the second cartridge valve, the third cartridge valve and the fourth cartridge valve are respectively connected to an online oil pressure detection port for online detection of the working status of the corresponding shutdown solenoid valve.

6. The four-speed two-speed shutdown control device according to claim 1 is characterized in that: A pressure switch or a pressure transmitter is arranged at the online oil pressure detection port.

7. The four-speed two-speed shutdown control device according to claim 1 is characterized in that: A stop valve is also provided between the T port of the starting oil control valve and the oil return port, and a throttling hole is also provided between the stop valve and the T port of the starting oil control valve.

8. The four-speed two-speed shutdown control device according to claim 1 is characterized in that: The quick-close shutdown control device also includes a support frame, on which the main control module is fixed, and both ends of the first oil pipeline and the second oil pipeline are respectively connected to the first shutdown control module and the second shutdown control module after passing through the support frame from the bottom of the main control module.

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