Cylinder connecting device of steam turbine and steam turbine

Abstract

The utility model relates to the technical field of steam turbines, and discloses a steam turbine cylinder connecting device and a steam turbine, the steam turbine cylinder connecting device comprises an intermediate pressure cylinder, a low pressure cylinder, a first pipeline, a second pipeline and a third pipeline, the first pipeline is provided with a first regulating valve, the second pipeline is provided with a second regulating valve, and the third pipeline is provided with a third regulating valve. Wherein the first pipeline, the second pipeline and the third pipeline are respectively connected with the medium-pressure cylinder and the low-pressure cylinder. By respectively controlling the steam flow in the three communicating pipelines, the medium-pressure cylinder can flexibly adjust the steam exhaust amount and the steam exhaust object based on different working conditions, so that stable and reliable steam supply of the cylinder connecting device under various working conditions is realized, and the flexible peak regulation of the steam turbine is realized. Moreover, when any one communicating pipeline breaks down, the steam exhaust state of the medium-pressure cylinder can be adjusted in time through other communicating pipelines, and the stability and reliability of operation of the steam turbine are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam turbines, in particular to a cylinder connecting device of a steam turbine and the steam turbine. BACKGROUND

[0002] With the acceleration of industrialization and the growth of energy demand, the operation efficiency and safety of the heating unit steam turbine have become the focus of the power industry. In the operation process of the heating unit steam turbine, the control of the medium-pressure cylinder exhaust pressure is particularly critical. The existing control mode of the medium-pressure cylinder exhaust pressure of the heating unit steam turbine has certain limitations and risks, especially after the heating reform, the risk of medium-pressure cylinder trip increases, which challenges the stability and reliability of the unit.

[0003] The working condition of the heating unit steam turbine is complex, the exhaust state of the cylinder connecting device under different working conditions is complex, the regulation and control mode between the medium-pressure cylinder exhaust pressure and the low-pressure cylinder inlet pressure is single, and the accuracy and reliability of the regulation and control are low. Especially in the event of an emergency, for example, if the connecting pipeline between the medium-pressure cylinder and the low-pressure cylinder is accidentally closed or the heat load suddenly disappears, the medium-pressure cylinder exhaust pressure quickly rises to the trip protection set value, causing the unit to be out of service, which not only affects the operation efficiency of the unit, but also causes damage to the equipment, increases the maintenance cost and safety hazards. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to at least solve one of the technical problems existing in the prior art or related art.

[0005] Therefore, according to a first aspect of the technical scheme of the present application, a cylinder connecting device of a steam turbine is provided, which comprises: a medium-pressure cylinder and a low-pressure cylinder, a first pipeline, a second pipeline and a third pipeline, the first pipeline is provided with a first regulating valve, the second pipeline is provided with a second regulating valve, and the third pipeline is provided with a third regulating valve. Wherein, the first pipeline, the second pipeline and the third pipeline are connected with the medium-pressure cylinder and the low-pressure cylinder respectively.

[0006] In some technical schemes provided by the present application, the cylinder connecting device further comprises: an outlet pipeline, the inlet end of the outlet pipeline is connected with the medium-pressure cylinder, the outlet end of the outlet pipeline is used for connecting an extraction system, and the outlet pipeline is provided with a first safety valve.

[0007] In some technical schemes provided by the present application, the cylinder connecting device further comprises: a second safety valve, which is arranged in the outlet pipeline.

[0008] In some technical schemes provided by the present application, the cylinder connecting device further comprises: a pressure sensor, which is arranged at the outlet end of the medium-pressure cylinder.

[0009] In some technical solutions provided in the application, the cylinder connecting device further comprises a displacement sensor and a travel switch, the displacement sensor is arranged on the first regulating valve and the second regulating valve, and the displacement sensor is used for detecting the opening degree of the first regulating valve and the second regulating valve. The travel switch is arranged on the first regulating valve and the second regulating valve, and the travel switch is used for detecting the opening state of the first regulating valve and the second regulating valve.

[0010] In some technical solutions provided in the application, the diameter of the third pipeline is smaller than the diameters of the first pipeline and the second pipeline.

[0011] In some technical solutions provided in the application, the cylinder connecting device further comprises a check valve, and the check valve is arranged on the outlet pipeline.

[0012] In some technical solutions provided in the application, the first regulating valve and the second regulating valve are manual valves.

[0013] In some technical solutions provided in the application, the third regulating valve is an electric valve.

[0014] In the second aspect of the application, a steam turbine is provided, and the steam turbine comprises the cylinder connecting device provided in any one of the first aspect of the application.

[0015] Compared with the related art, the application has at least the following beneficial effects:

[0016] By arranging three communication pipelines and three regulating valves, the opening and closing states of the three regulating valves can be determined based on the working state, the exhaust mode of the intermediate-pressure cylinder is enriched, the first regulating valve, the second regulating valve and the third regulating valve can control the communication state of the communication pipeline according to different working conditions, and then the steam flow in the three communication pipelines can be controlled, and the exhaust amount of the intermediate-pressure cylinder to the low-pressure cylinder can be controlled, so that the intermediate-pressure cylinder can flexibly adjust the exhaust amount and the exhaust object based on different working conditions, and then stable and reliable steam supply of the cylinder connecting device under various working conditions can be realized, flexible peak regulation of the steam turbine is realized, and the consumption capacity of new energy is effectively improved. In addition, the number of communication pipelines is increased, when any one of the communication pipelines fails, the exhaust state of the intermediate-pressure cylinder can be adjusted in time through other communication pipelines, overpressure tripping caused by the failure of a single pipeline is avoided, the risk of non-scheduled shutdown caused by overpressure exhaust of the intermediate-pressure cylinder is reduced, the stability and reliability of the steam turbine operation are improved, and the safety hidden danger is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of some embodiments with reference to the drawings. The drawings are for purposes of illustration only and are not considered a limitation of the application. Moreover, in the drawings, like reference numerals designate similar parts throughout the several views. In the drawings:

[0018] Figure 1 This is a connection diagram of a cylinder connection device according to an embodiment of this application.

[0019] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0020] 10 Cylinder connecting device, 100 Medium pressure cylinder, 200 Low pressure cylinder, 300 First pipeline, 310 First regulating valve, 400 Second pipeline, 410 Second regulating valve, 500 Third pipeline, 510 Third regulating valve, 600 Outlet pipeline, 610 First safety valve, 620 Second safety valve, 700 Pressure sensor. Detailed Implementation

[0021] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0022] The first aspect of this application provides a cylinder connection device 10 for a steam turbine, such as... Figure 1 As shown, the turbine cylinder connection device 10 includes: an intermediate-pressure cylinder 100 and a low-pressure cylinder 200, a first pipeline 300, a second pipeline 400, and a third pipeline 500. The intermediate-pressure cylinder 100 is used to connect to the extraction steam system. The first pipeline 300 is equipped with a first regulating valve 310, the second pipeline 400 is equipped with a second regulating valve 410, and the third pipeline 500 is equipped with a third regulating valve 510. The first pipeline 300, the second pipeline 400, and the third pipeline 500 are respectively connected to the intermediate-pressure cylinder 100 and the low-pressure cylinder 200.

[0023] In this embodiment, the intermediate-pressure cylinder 100 and the low-pressure cylinder 200 are used to contain the steam in the steam turbine. The steam in the intermediate-pressure cylinder 100 can enter the extraction system to provide a heat source for the extraction system. The low-pressure cylinder 200 can be used for perforated extraction, zero-output operation, or low-output operation. The steam pressure in the intermediate-pressure cylinder 100 is greater than the steam pressure in the low-pressure cylinder 200. At least three connecting pipes are provided between the intermediate-pressure cylinder 100 and the low-pressure cylinder 200. The connecting pipes include a first pipe 300, a second pipe 400, and a third pipe 500. The two ends of any connecting pipe are connected to the intermediate-pressure cylinder 100 and the low-pressure cylinder 200, respectively, so that the steam in the intermediate-pressure cylinder 100 can enter the low-pressure cylinder 200 through any connecting pipe.

[0024] The adjusting valve is arranged on any one of the communication pipelines, and is used for adjusting the flow in the communication pipeline. The adjusting valve is an EGV (Exhaust Gas Valve, medium-low pressure communication pipeline butterfly valve). Specifically, the adjusting valve includes a first adjusting valve 310, a second adjusting valve 410, and a third adjusting valve 510. The three adjusting valves are arranged in the first pipeline 300, the second pipeline 400, and the third pipeline 500 respectively. The adjusting valve can adjust the opening degree and control the steam flow in the communication pipeline through the opening degree. When the opening degree of the adjusting valve is 0%, the adjusting valve is in a closed state, and the steam in the communication pipeline stops flowing. When the opening degree of the adjusting valve is 100%, the adjusting valve is in a maximum opening state, and the steam in the communication pipeline is in a state of maximum flow.

[0025] It should be noted that the steam discharge amount and the steam discharge object of the medium-pressure cylinder 100 are different in different working states, and an operator can confirm the working state through manual operation. The working state includes a pure condensation working condition, an extraction condensation working condition, and a cylinder cutting working condition.

[0026] By arranging the three communication pipelines and the three adjusting valves, the three adjusting valves can determine their opening and closing states based on the working state, thereby enriching the steam discharge mode of the medium-pressure cylinder 100. The first adjusting valve 310, the second adjusting valve 410, and the third adjusting valve 510 can control the communication state of the communication pipeline according to different working conditions, and then control the steam flow in the three communication pipelines respectively, and control the steam discharge amount of the medium-pressure cylinder 100 to the low-pressure cylinder 200, so that the medium-pressure cylinder 100 can flexibly adjust the steam discharge amount and the steam discharge object based on different working conditions, thereby realizing stable and reliable steam supply of the steam cylinder connecting device 10 in various working conditions, realizing flexible peak regulation of the steam turbine, and effectively improving the consumption capacity of new energy. Moreover, the number of communication pipelines is increased, so that when any one of the communication pipelines fails, the steam discharge state of the medium-pressure cylinder 100 can be adjusted in time through the other communication pipelines, thereby avoiding the situation that the single pipeline is closed once a failure occurs, leading to overpressure tripping, reducing the risk of unplanned shutdown caused by steam discharge overpressure of the medium-pressure cylinder 100, improving the stability and reliability of the steam turbine operation, and reducing the safety hidden danger.

[0027] Exemplarily, the pipe diameters of the first pipeline 300 and the second pipeline 400 are the same.

[0028] Exemplarily, the steam cylinder connecting device 10 further includes a fourth pipeline, and the fourth pipeline is provided with a fourth adjusting valve, thereby further enriching the steam discharge mode of the medium-pressure cylinder 100 and improving the stability and reliability of the steam turbine operation.

[0029] In some embodiments provided in the present application, as Figure 1As shown, the cylinder connecting device 10 further comprises an outlet pipeline 600, an inlet end of the outlet pipeline 600 is connected with the intermediate-pressure cylinder 100, an outlet end of the outlet pipeline 600 is used for connecting a steam extraction system, and the outlet pipeline 600 is provided with a first safety valve 610.

[0030] In this embodiment, two ends of the outlet pipeline 600 are connected with the outlet end of the intermediate-pressure cylinder 100 and the steam extraction system respectively, the steam in the intermediate-pressure cylinder 100 enters the steam extraction system through the outlet pipeline 600, and the outlet pipeline 600 is provided with the first safety valve 610.

[0031] When the intermediate-pressure cylinder 100 is in the extraction condensing working condition or encounters an emergency, the exhaust pressure can continuously increase, and when the exhaust pressure increases to above the relief pressure, the first safety valve 610 is opened and relief is performed to discharge the steam in the outlet pipeline 600. It can be understood that when the exhaust pressure reaches the trip pressure of the steam turbine, the steam turbine is automatically stopped, the relief pressure is less than the trip pressure of the steam turbine, so that the first safety valve 610 can realize the relief function before the exhaust pressure of the intermediate-pressure cylinder reaches the trip protection setting value, thereby reducing the risk of non-normal shutdown of the unit caused by the overpressure of the exhaust pressure of the intermediate-pressure cylinder, and improving the stability and reliability of the operation of the steam turbine.

[0032] After the first safety valve 610 is opened, the exhaust pressure decreases, and when the exhaust pressure decreases to below the backseat pressure, the first safety valve 610 is backseated, so that the operating personnel can troubleshoot the fault and keep the steam turbine continuously and stably operating.

[0033] In some embodiments provided in the present application, as shown in Figure 1 As shown, the cylinder connecting device 10 further comprises a second safety valve 620, and the second safety valve 620 is arranged in the outlet pipeline 600.

[0034] In this embodiment, the second safety valve 620 and the first safety valve 610 are arranged in the outlet pipeline 600 in a spaced manner, two safety valves are arranged in the outlet pipeline 600, that is, when any one of the safety valves fails, the other safety valve can be used for relief, so as to realize the function of the standby safety valve, and when the exhaust pressure is too large, the first safety valve 610 and the second safety valve 620 can be used for relief at the same time, so as to improve the exhaust efficiency, reduce the overpressure risk in the outlet pipeline 600, and improve the safety of the cylinder connecting device 10.

[0035] Exemplarily, the first safety valve 610 and the second safety valve 620 are spring safety valves.

[0036] In some embodiments provided in the present application, as shown in Figure 1 As shown, the cylinder connecting device 10 further comprises a pressure sensor 700, and the pressure sensor 700 is arranged at the outlet end of the intermediate-pressure cylinder 100.

[0037] In this embodiment, the pressure sensor 700 is configured to detect the exhaust pressure of the intermediate-pressure cylinder 100 to determine the exhaust state of the intermediate-pressure cylinder 100. When the exhaust pressure of the intermediate-pressure cylinder 100 is greater than or equal to a pressure threshold, it indicates that the intermediate-pressure cylinder 100 is in an overpressure state, for example, the heat load is suddenly lost, and the steam extraction system stops extracting steam. The exhaust pressure of the intermediate-pressure cylinder 100 rises rapidly, which can fully open the first regulating valve 310 and / or the second regulating valve 410, so that the exhaust of the intermediate-pressure cylinder 100 can be discharged into the low-pressure cylinder 200 in time, thereby improving the safety of the operation of the cylinder connecting device 10.

[0038] In some embodiments provided in the present application, the cylinder connecting device 10 further comprises a displacement sensor and a travel switch. The displacement sensor is arranged on the first regulating valve 310 and the second regulating valve 410, and is configured to detect the opening degree of the first regulating valve 310 and the second regulating valve 410. The travel switch is arranged on the first regulating valve 310 and the second regulating valve 410, and is configured to detect the opening state of the first regulating valve 310 and the second regulating valve 410.

[0039] In this embodiment, the first regulating valve 310 and the second regulating valve 410 are both provided with a displacement sensor and a travel switch, which are respectively configured to detect the opening degree and the opening state of the first regulating valve 310 and the second regulating valve 410. The opening state includes fully closed and fully open. When the opening degree is 0%, the opening state is fully closed. When the opening degree is 100%, the opening state is fully open. Based on the opening degree detected by the displacement sensor and the opening state detected by the travel switch, the working state of the first regulating valve 310 and the second regulating valve 410 can be determined. When the deviation of the detected opening degree from the preset opening degree is too large, and the opening state is fully closed, it is determined that the working state of the regulating valve is a fault state.

[0040] In some embodiments provided in the present application, the cylinder connecting device 10 further comprises a first pressure detection member and a second pressure detection member. The first pressure detection member is arranged on the first pipeline 300, and the second pressure detection member is arranged on the second pipeline 400.

[0041] In this embodiment, the first pipeline 300 is provided with a first pressure detection element, and the second pipeline 400 is provided with a second pressure detection element. The first pressure detection element and the second pressure detection element are respectively used to detect the exhaust pressure in the first pipeline 300 and the second pipeline 400 to monitor the exhaust pressure in the first pipeline 300 and the second pipeline 400. Based on the exhaust pressure of the first pipeline 300 and the second pipeline 400, the working status of the first regulating valve 310 and the second regulating valve 410 is determined. When the exhaust pressure of the first pipeline 300 or the second pipeline 400 is greater than or equal to the preset pressure, it indicates that the first pipeline 300 or the second pipeline 400 is in a blocked state, and it is determined that the first regulating valve 310 or the second regulating valve 410 is in a fault state.

[0042] In some embodiments provided in this application, the diameter of the third pipe 500 is smaller than the diameter of the first pipe 300 and the diameter of the second pipe 400.

[0043] In this embodiment, when the operating state is cylinder-cutting mode, the first regulating valve 310 and the second regulating valve 410 are closed, and the third regulating valve 510 is opened to the cylinder-cutting opening degree. The cylinder-cutting opening degree depends on the amount of cooling steam required by the low-pressure cylinder 200. Since the function of the third pipeline 500 is to ensure that the low-pressure cylinder 200 has an appropriate amount of steam intake to prevent the low-pressure cylinder 200 from being damaged due to overheating, the steam output of the third pipeline 500 is relatively smaller than that of the first pipeline 300 and the second pipeline 400. By limiting the diameter of the third pipeline 500, the material used in the third pipeline 500 is reduced, and the rationality of the pipeline layout is improved.

[0044] In some embodiments provided in this application, the cylinder connection device 10 further includes a check valve, which is located in the outlet pipe 600.

[0045] In this embodiment, the outlet pipe 600 is equipped with a check valve, which controls the steam flow direction in the outlet pipe 600, so that the steam flows from the intermediate pressure cylinder 100 to the steam extraction system, preventing the steam in the outlet pipe 600 from flowing back, and enabling the intermediate pressure cylinder 100 to supply steam smoothly.

[0046] In some embodiments provided in this application, such as Figure 1 As shown, the first regulating valve 310 and the second regulating valve 410 are manual valves.

[0047] In this embodiment, when the cylinder connection device 10 is in the condensation extraction condition, if the first regulating valve 310 or the second regulating valve 410 fails, the operator can manually operate the other regulating valve to timely regulate the flow in the first pipeline 300 and the second pipeline 400, ensuring the flow capacity between the medium-pressure cylinder 100 and the low-pressure cylinder 200, and improving the reliability of equipment operation.

[0048] In some embodiments provided in the present application, as shown in Figure 1 The third regulating valve 510 is an electric valve.

[0049] In this embodiment, since the opening state of the third regulating valve 510 is relatively stable, the regulating opening degree is less, and therefore, the third regulating valve 510 is set as an electric valve, thereby improving the control convenience and use stability of the third regulating valve 510.

[0050] In the second aspect of the embodiments of the present application, a steam turbine is provided, which comprises the cylinder connecting device 10 provided in any one of the first aspect of the embodiments.

[0051] In this embodiment, it should be noted that the steam turbine comprises the cylinder connecting device 10 provided in any one of the embodiments, and therefore has all the beneficial technical effects of the cylinder connecting device 10, which will not be described herein again to avoid repetition.

[0052] In one specific embodiment, a control device for preventing overpressure of the intermediate-pressure cylinder exhaust pressure of a heating unit steam turbine is provided to reduce the risk of non-stop caused by overpressure of the intermediate-pressure cylinder exhaust pressure of the unit. By adding a bypass to the EGV, the risk of rapid rise of the intermediate-pressure cylinder exhaust pressure to reach the trip protection set value due to accidental closure of the EGV when only one EGV is configured is avoided. By adding a safety valve to the outlet pipeline 600, the pressure relief function is realized before the intermediate-pressure cylinder exhaust pressure rapidly rises to reach the trip protection set value, thereby reducing the risk of non-stop of the unit and solving the problem of increased risk of trip of the intermediate-pressure cylinder exhaust pressure caused by the existing heating modification, thereby improving the stability and reliability of the operation of the heating unit.

[0053] In the specific operation of the intermediate-pressure cylinder exhaust pressure overpressure control device, the first regulating valve 310 is connected as a branch of the second regulating valve 410, and the first regulating valve 310 and the second regulating valve 410 maintain the same opening degree. In the pure condensing condition, the first regulating valve 310, the second regulating valve 410 and the third regulating valve 510 are fully opened to 100% opening degree. In the extraction condensing condition, the first regulating valve 310 and the second regulating valve 410 maintain the same opening degree, and the opening degree depends on the heating load, and the third regulating valve 510 is fully closed. In the cylinder cutting condition, the first regulating valve 310 and the second regulating valve 410 are closed, and the third regulating valve 510 is opened to a certain opening degree, and the opening degree depends on the required cooling steam amount of the low-pressure cylinder 200.

[0054] When the first regulating valve 310 or the second regulating valve 410 is unexpectedly closed due to failure under the extraction and condensation working condition, the second regulating valve 410 or the first regulating valve 310 is still at a certain opening degree, and the control system determines that the first regulating valve 310 or the second regulating valve 410 is faulty, and then opens the second regulating valve 410 or the first regulating valve 310 to 100% opening degree. When the heat load is suddenly lost, the extraction system no longer extracts steam, and the second regulating valve 410 and / or the first regulating valve 310 is fully opened to 100% opening degree. If the above process continues, the pressure of the exhaust steam of the intermediate-pressure cylinder continues to rise to the trip pressure value of the first safety valve 610 and the second safety valve 620, the first safety valve 610 and the second safety valve 620 trip to release pressure, and the pressure of the exhaust steam of the intermediate-pressure cylinder is kept below the trip value of the unit, and when the pressure of the exhaust steam of the intermediate-pressure cylinder drops to the reset pressure value of the first safety valve 610 and the second safety valve 620, the first safety valve 610 and the second safety valve 620 reset. After that, the operation personnel troubleshoots the fault and keeps the unit running stably.

[0055] In the present application, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "a plurality of" means two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connecting" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the present application.

[0057] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above merely some embodiments of the present utility model, and is not for limiting the present utility model, for the person skilled in the art, the present utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the present utility model, should be contained in the protection scope of the present utility model.

Claims

1. A steam cylinder connecting device of a steam turbine, characterized by comprising: Comprising: a medium-pressure cylinder and a low-pressure cylinder; a first pipeline provided with a first regulating valve; a second pipeline provided with a second regulating valve; a third pipeline provided with a third regulating valve; wherein the first pipeline, the second pipeline and the third pipeline are connected to the medium-pressure cylinder and the low-pressure cylinder respectively.

2. The cylinder connection device of claim 1, wherein Further comprising: an outlet pipeline, an inlet end of which is connected to the medium-pressure cylinder, an outlet end of which is used for connecting to a steam extraction system, the outlet pipeline being provided with a first safety valve.

3. The cylinder connection arrangement of claim 2, wherein, Further comprising: a second safety valve, which is provided in the outlet pipeline.

4. The cylinder connection device of claim 1, wherein Further comprising: a pressure sensor, which is provided at an outlet end of the medium-pressure cylinder.

5. The cylinder connection device of claim 1, wherein Further comprising: a displacement sensor, which is provided in the first regulating valve and the second regulating valve, and is used for detecting the opening degree of the first regulating valve and the second regulating valve; a travel switch, which is provided in the first regulating valve and the second regulating valve, and is used for detecting the opening state of the first regulating valve and the second regulating valve.

6. The cylinder connection device according to claim 1, characterized in that: a pipe diameter of the third pipeline is smaller than pipe diameters of the first pipeline and the second pipeline.

7. The cylinder connection device of claim 2, wherein Further comprising: a check valve, which is provided in the outlet pipeline.

8. The cylinder connection device according to any one of claims 1 to 7, characterized in that: the first regulating valve and the second regulating valve are manual valves.

9. The cylinder connection device according to any one of claims 1 to 7, characterized in that: the third regulating valve is an electric valve.

10. A steam turbine, characterized by Comprising: the cylinder connection device according to any one of claims 1 to 9.

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