Vacuum circulation degassing refining equipment and vacuum system capable of automatically relieving pressure

Abstract

The utility model discloses vacuum circulation degassing refining equipment and a vacuum system capable of automatically relieving pressure, and relates to the technical field of degassing refining equipment. In the vacuum system, a main control valve is arranged on a low-pressure main air exhaust pipeline and is used for controlling the on-off of the low-pressure main air exhaust pipeline; the high-pressure branch air exhaust pipeline is connected to a first pipe section, provided with a main control valve, of the low-pressure main air exhaust pipeline in parallel, and the maximum working pressure of the high-pressure branch air exhaust pipeline is larger than that of the low-pressure main air exhaust pipeline; the pressure relief control valves are arranged on the high-pressure branch air exhaust pipelines and are used for controlling the connection and disconnection of the high-pressure branch air exhaust pipelines; the detection assembly is used for detecting working parameters of the vacuum circulating degassing refining equipment; the controller is in signal connection with the vacuum pump, the detection assembly, the main control valve and the pressure relief control valve and used for receiving the detection result of the detection assembly and controlling opening and closing of the main control valve and the pressure relief control valve and action of the vacuum pump so as to control pre-vacuumizing or formal vacuumizing. By using the vacuum system, the smoke generated by refining molten steel can be effectively prevented from being discharged into a refining site.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of degassing refining equipment, and more particularly to a vacuum circulation degassing refining equipment and a vacuum system capable of automatic pressure relief. BACKGROUND

[0002] The vacuum circulation degassing refining equipment, such as an RH furnace, is an important secondary refining equipment for molten steel in steel metallurgy, and is widely used in the production of high-grade steel such as automobile steel, low-carbon steel and X80 pipeline steel. The principle of refining molten steel by the vacuum circulation degassing refining equipment is to perform vacuum circulation degassing on the molten steel, rely on the strong suction generated by the vacuum system to continuously extract and discharge the waste gas generated by the chemical reaction of the molten steel in the vacuum chamber to the outside of the plant, so that a vacuum environment is formed in the vacuum chamber and the vacuum system, thereby achieving the purpose of refining the molten steel.

[0003] The specific operation process is that first, the ladle tank containing molten steel is lifted into the vacuum chamber by the lifting device, and the vacuum system is started to perform vacuum circulation degassing. However, during the process of continuously lifting the ladle tank, when the molten steel contacts the insertion pipe inside the vacuum chamber, the gas in the pipeline connecting the vacuum system and the vacuum chamber will expand sharply due to heating, and will interact with the protective nitrogen gas injected into the vacuum chamber at the same time, forming a positive pressure. When the positive pressure increases to a certain extent, it is very likely to break the explosion vent valve provided on the vacuum circulation degassing refining equipment, so that the flue gas in the vacuum chamber is quickly discharged, affecting the environment of the smelting site.

[0004] In summary, how to avoid the discharge of flue gas generated during the refining of molten steel by the vacuum circulation degassing refining equipment into the refining site is a problem that needs to be solved by the technical personnel in the field at present. CONTENT OF THE INVENTION

[0005] Therefore, the purpose of the present application is to provide a vacuum system capable of automatic pressure relief, which can effectively avoid the discharge of flue gas generated during the refining of molten steel into the refining site.

[0006] Another purpose of the present application is to provide a vacuum circulation degassing refining equipment comprising the above-mentioned vacuum system capable of automatic pressure relief.

[0007] In order to achieve the above-mentioned purpose, the present application provides the following technical solution:

[0008] A vacuum system capable of automatic pressure relief is used in a vacuum circulation degassing refining equipment to perform vacuumizing treatment on the vacuum chamber, comprising a vacuum pump and a low-pressure main air extraction pipeline, the first end of the low-pressure main air extraction pipeline is used to connect the vacuum chamber of the vacuum circulation degassing refining equipment in a conductive manner, the second end of the low-pressure main air extraction pipeline is connected to the vacuum pump in a conductive manner, and further comprising a high-pressure sub-air extraction pipeline, a master control valve, a pressure relief control valve, a detection assembly and a controller.

[0009] The main control valve is arranged in the low-pressure main exhaust pipeline to control the opening and closing of the low-pressure main exhaust pipeline.

[0010] The high-pressure sub-exhaust pipeline is connected in parallel to the first pipeline section of the low-pressure main exhaust pipeline provided with the main control valve, and the maximum working pressure of the high-pressure sub-exhaust pipeline is greater than that of the low-pressure main exhaust pipeline.

[0011] The pressure relief control valve is arranged in the high-pressure sub-exhaust pipeline to control the opening and closing of the high-pressure sub-exhaust pipeline.

[0012] The detection assembly is used to detect the working parameters of the vacuum circulating degassing refining equipment.

[0013] The controller is signal-connected with the vacuum pump, the detection assembly, the main control valve and the pressure relief control valve to receive the detection results of the detection assembly and control the opening and closing of the main control valve and the pressure relief control valve and the action of the vacuum pump, so as to control the pre-vacuum through the high-pressure sub-exhaust pipeline or the formal vacuum through the low-pressure main exhaust pipeline.

[0014] Preferably, the detection assembly comprises a position detector used to detect the jacking position of the ladle.

[0015] Preferably, the detection assembly comprises a pressure detector used to detect the air pressure in the automatic pressure relief vacuum system.

[0016] Preferably, the controller has a processor and a fault diagnostic device.

[0017] The processor is signal-connected with the vacuum pump, the detection assembly, the main control valve and the pressure relief control valve.

[0018] The fault diagnostic device is signal-connected with the processor to receive the pressure data and the detection data of the pressure detector and output the fault type.

[0019] Preferably, the pressure relief control valve is provided with a valve rod position detector used to detect the valve rod position of the pressure relief control valve.

[0020] The valve rod position detector is signal-connected with the fault diagnostic device.

[0021] Preferably, the controller has an alarm notifier signal-connected with the fault diagnostic device, which is used to receive the fault type and output the corresponding alarm signal.

[0022] Preferably, the low-pressure main exhaust pipeline has a first exhaust pipeline section and a second exhaust pipeline section.

[0023] The first gas extraction pipe section is an L-shaped pipe, and the first end structure of the first gas extraction pipe section extends vertically, and the top end thereof is connected to the vacuum chamber in a conductive manner;

[0024] One end of the main control valve is connected to the first end of the first gas extraction pipe section in a conductive manner, and the other end thereof is connected to the first end of the second gas extraction pipe section in a conductive manner, and the second end of the second gas extraction pipe section is connected to the vacuum pump in a conductive manner;

[0025] The high-pressure sub-gas extraction pipe is an L-shaped pipe, and the top structure of the high-pressure sub-gas extraction pipe extends horizontally and is connected to the first gas extraction pipe section in a conductive manner, and the bottom structure of the high-pressure sub-gas extraction pipe extends vertically and is connected to the second gas extraction pipe section in a conductive manner.

[0026] Preferably, the high-pressure sub-gas extraction pipe is further provided with a manual pressure relief valve.

[0027] Preferably, the main control valve and the pressure relief control valve are both pneumatic on-off valves.

[0028] A vacuum circulating degassing refining device comprising the vacuum system capable of automatic pressure relief.

[0029] In this application, in order to realize vacuumization for vacuum degassing treatment of molten steel, the vacuum system is provided for the vacuum circulating degassing refining device, specifically, a vacuum pump and a low-pressure main gas extraction pipe, specifically, the right end of the main gas extraction pipe is connected to the gas extraction port of the vacuum pump, in use, the left end of the main gas extraction pipe is connected to the vacuum chamber, and the inner cavity of the vacuum chamber is in communication with the left end opening of the main gas extraction pipe, and the vacuum pump is started, so that the gas in the vacuum chamber is extracted, so that the inner cavity of the vacuum chamber is in a vacuum environment.

[0030] In order to avoid the influence of smelting caused by the explosion relief valve being blown off, the vacuum system is further provided with a high-pressure sub-gas extraction pipe, a main control valve, a pressure relief control valve, a detection assembly and a controller, specifically, the main control valve is arranged on the low-pressure main gas extraction pipe to control the opening and closing of the internal passage of the low-pressure main gas extraction pipe, and the low-pressure sub-gas extraction pipe is connected to the low-pressure main gas extraction pipe, the low-pressure sub-gas extraction pipe is connected to the first pipe section of the low-pressure main gas extraction pipe provided with the main control valve in parallel, and the pressure relief control valve is arranged on the high-pressure sub-gas extraction pipe to control the opening and closing of the internal passage of the high-pressure sub-gas extraction pipe, so that the gas in the vacuum chamber can be selectively extracted through the high-pressure sub-gas extraction pipe and / or the first pipe section of the low-pressure main gas extraction pipe through the main control valve and the pressure relief control valve.

[0031] In order to automatically control the opening and closing of the main control valve and the pressure relief control valve, the vacuum system is provided with a detection assembly for detecting working parameters, such as pressure or flow, of a vacuum cycle degassing refining device provided with the vacuum system. The detection assembly, the main control valve, the pressure relief control valve and the vacuum pump are all signal-connected to a controller. In use, the detection assembly detects in real time during the process, and transmits the detection results to the controller. The controller judges whether the pre-vacuum standard, the formal vacuum standard and the like are reached according to the received detection results, and controls the opening and closing of the main control valve and the pressure relief control valve according to the judgment results, and controls the action of the vacuum pump according to the pre-vacuum or formal vacuum working condition to be achieved.

[0032] In summary, the vacuum system can be automatically adjusted to automatically achieve pre-vacuum or formal vacuum, has fast response speed, can effectively avoid the pressure relief valve from being opened, is beneficial to guarantee the cleanliness of the smelting environment, and can avoid the leakage of the main control valve due to the influence of the rapidly increased gas pressure on the low-pressure main air duct, so that the molten steel vacuum degassing treatment can be continuously performed. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0034] Figure 1 The structural schematic diagram of the specific embodiment provided by the present application is shown in the figure.

[0035] Figure 2 The local schematic diagram of the specific embodiment provided by the present application is shown in the figure.

[0036] Figure 3 The control schematic diagram of the specific embodiment provided by the present application is shown in the figure.

[0037] Reference signs:

[0038] 1-vacuum pump; 2-low-pressure main air duct; 21-first air duct section; 22-second air duct section; 3-high-pressure sub-air duct; 4-main control valve; 5-pressure relief control valve; 51-valve rod position detector; 6-manual pressure relief valve; 7-detection assembly; 8-controller; 81-processor; 82-fault diagnosis device; 83-alarm notifier. DETAILED DESCRIPTION

[0039] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0040] The core of the present application is to provide a vacuum system capable of automatic pressure relief, and using the vacuum system can effectively avoid the smoke generated by refining molten steel from being discharged into the refining site. Another core of the present application is to provide a vacuum circulation degassing refining device comprising the above-mentioned vacuum system capable of automatic pressure relief.

[0041] The present application provides a vacuum system capable of automatic pressure relief, which is used in a vacuum circulation degassing refining device to perform vacuumizing treatment on a vacuum chamber, comprising a vacuum pump 1 and a low-pressure main air extraction pipeline 2, a first end of the low-pressure main air extraction pipeline 2 is connected to the vacuum chamber of the vacuum circulation degassing refining device in a conductive manner, a second end of the low-pressure main air extraction pipeline 2 is connected to the vacuum pump 1 in a conductive manner, and the vacuum system is characterized in that it further comprises a high-pressure sub-air extraction pipeline 3, a main control valve 4, a pressure relief control valve 5, a detection assembly 7 and a controller 8.

[0042] The main control valve 4 is arranged in the low-pressure main air extraction pipeline 2 and is used to control the on-off of the low-pressure main air extraction pipeline 2.

[0043] The high-pressure sub-air extraction pipeline 3 is connected in parallel to the first pipe section of the low-pressure main air extraction pipeline 2 where the main control valve 4 is arranged, and the maximum working pressure of the high-pressure sub-air extraction pipeline 3 is greater than that of the low-pressure main air extraction pipeline 2.

[0044] The pressure relief control valve 5 is arranged in the high-pressure sub-air extraction pipeline 3 and is used to control the on-off of the high-pressure sub-air extraction pipeline 3.

[0045] The detection assembly 7 is used to detect the working parameters of the vacuum circulation degassing refining device.

[0046] The controller 8 is signal-connected to the vacuum pump 1, the detection assembly 7, the main control valve 4 and the pressure relief control valve 5, is used to receive the detection results of the detection assembly 7 and control the opening and closing of the main control valve 4 and the pressure relief control valve 5 and the action of the vacuum pump 1, so as to control whether to perform preliminary vacuumizing through the high-pressure sub-air extraction pipeline 3 or formal vacuumizing through the low-pressure main air extraction pipeline 2.

[0047] Specifically, refer to Figure 1To realize vacuumizing for vacuum degassing treatment of molten steel, the vacuum system is provided for the vacuum circulating degassing refining equipment, specifically, a vacuum pump 1 and a low-pressure main air extraction pipeline 2, specifically, the right end of the main air extraction pipeline is connected to the air extraction port of the vacuum pump 1, in use, the left end of the main air extraction pipeline is connected to the vacuum chamber, and the inner cavity of the vacuum chamber is in communication with the left end opening of the main air extraction pipeline, the vacuum pump 1 is started, and the gas in the vacuum chamber is extracted to make the inner cavity of the vacuum chamber a vacuum environment.

[0048] To avoid the explosion relief valve being opened and affecting smelting, the vacuum system is further provided with a high-pressure sub-air extraction pipeline 3, a main control valve 4, a pressure relief control valve 5, a detection assembly 7 and a controller 8, specifically, the main control valve 4 is arranged on the low-pressure main air extraction pipeline 2 to control the opening and closing of the internal passage of the low-pressure main air extraction pipeline 2, and a low-pressure sub-air extraction pipeline is connected to the low-pressure main air extraction pipeline 2, and the low-pressure sub-air extraction pipeline is in parallel with the first pipe section of the low-pressure main air extraction pipeline 2 where the main control valve 4 is arranged; for example, as shown in Figure 1 and Figure 2 the left end of the high-pressure sub-air extraction pipeline 3 is connected to the left end of the first pipe section of the low-pressure main air extraction pipeline 2, and the right end of the high-pressure sub-air extraction pipeline 3 is connected to the right end of the first pipe section of the low-pressure main air extraction pipeline 2; and the pressure relief control valve 5 is arranged on the high-pressure sub-air extraction pipeline 3 to control the opening and closing of the internal passage of the high-pressure sub-air extraction pipeline 3, so that the gas in the vacuum chamber can be selectively extracted through the high-pressure sub-air extraction pipeline 3 and / or the first pipe section of the low-pressure main air extraction pipeline 2 by the main control valve 4 and the pressure relief control valve 5.

[0049] To automatically control the opening and closing of the main control valve 4 and the pressure relief control valve 5, as shown in Figure 3 the vacuum system is provided with a detection assembly 7 for detecting the working parameters of the vacuum circulating degassing refining equipment provided with the vacuum system, such as pressure or flow rate, etc., the detection assembly 7, the main control valve 4, the pressure relief control valve 5 and the vacuum pump 1 are signal connected to the controller 8, in use, the detection assembly 7 detects the results in real time and transmits them to the controller 8, the controller 8 judges whether the pre-vacuumizing standard, the formal vacuumizing standard, etc. are reached according to the received detection results, and controls the opening and closing of the main control valve 4 and the pressure relief control valve 5 according to the judgment results, and controls the action of the vacuum pump 1 according to the working conditions to be achieved, such as pre-vacuumizing or formal vacuumizing, etc., for example, if the vacuum pump 1 is a multi-stage pump, the corresponding pump body can be started according to the working conditions to be achieved, or if the vacuum pump 1 is a variable frequency vacuum pump 1, the rotating speed of the power part in the vacuum pump 1 can be controlled according to the working conditions to be achieved.

[0050] In summary, the vacuum system can be automatically adjusted to automatically achieve pre-evacuation or formal evacuation, with fast response speed, which can effectively avoid the explosion relief valve being opened, is conducive to ensuring the cleanliness of the smelting environment, and can avoid the situation that the main control valve 4 of the low-pressure main exhaust pipe 2 is affected by the surge pressure to leak, so as to continuously carry out the vacuum degassing treatment of molten steel, thereby realizing continuous and stable production and stable control of vacuum degree.

[0051] On the basis of the above-mentioned embodiments, the detection assembly 7 comprises a position detector for detecting the jacking position of the ladle.

[0052] Specifically, the vacuum system is provided with a position detector arranged in the vacuum chamber of the vacuum circulating degassing refining device; for example, the position detector can adopt a pull rope encoder, and the free end of the pull rope of the pull rope encoder is fixedly connected to the movable end of the ladle jacking structure, or the position detector can adopt a pulse laser ranging; the jacking height of the ladle is detected by the position detector, so as to accurately judge the current working condition of the vacuum circulating degassing refining device, so as to accurately control the opening and closing of the main control valve 4 and the pressure relief control valve 5.

[0053] For example, in some specific embodiments, when the molten steel in the ladle contacts the low-pressure main exhaust pipe 2 inserted into the second pipe section of the vacuum chamber, the pressure relief control valve 5 is opened by the controller 8, then the high-pressure gas in the pipe section between the vacuum chamber and the main control valve 4 of the low-pressure main exhaust pipe 2 can be timely extracted by the suction force generated by the pre-extraction of the vacuum pump 1, so as to realize pressure relief and prepare for gas extraction during the vacuum degassing treatment of the molten steel, and the insertion depth is detected by the position detection assembly 7 from the beginning of the insertion of the second pipe section into the molten steel, and when the depth of the second pipe section inserted into the molten steel reaches the target depth, that is, when the molten steel treatment starts, the main control valve 4 is opened and the pressure relief control valve 5 is closed by the controller 8.

[0054] On the basis of the above-mentioned embodiments, the detection assembly 7 comprises a pressure detector for detecting the gas pressure in the automatically pressure-relieved vacuum system.

[0055] The pressure detector is arranged on one side of the high-pressure sub-exhaust pipe 3 and / or the low-pressure main exhaust pipe 2 close to the vacuum chamber, and is signal-connected to the controller 8 in cooperation. In use, the controller 8 receives the pressure detection result, and judges the current working condition of the vacuum chamber and the working condition of the vacuum system according to the detection result, so as to accurately judge whether the pre-evacuation standard, the formal evacuation standard, etc. are reached, and the vacuum system can be accurately adjusted.

[0056] For example, in some embodiments, the controller 8 receives the detection result greater than 840 mbar to control the pressure relief control valve 5 to open, and receives the detection result less than 150 mbar to control the main control valve 4 to open and the pressure relief control valve 5 to close.

[0057] On the basis of the above-mentioned embodiments, the controller 8 has a processor 81 and a fault diagnostic device 82;

[0058] The processor 81 is signal connected with the vacuum pump 1, the detection assembly 7, the main control valve 4 and the pressure relief control valve 5;

[0059] The fault diagnostic device 82 is signal connected with the processor 81 to receive the pressure data and the detection data of the pressure detector, and output the fault type.

[0060] For reference Figure 3 In some embodiments, the controller 8 is composed of the processor 81, the fault diagnostic device 82 and the storage, first, the processor 81 is signal connected with the vacuum pump 1, the detection assembly 7, the main control valve 4 and the pressure relief control valve 5, so as to be able to judge according to the detection result of the detection assembly 7 to control the opening and closing of the main control valve 4 and the pressure relief control valve 5 and the action of the vacuum pump 1; secondly, the fault diagnostic device 82 is signal connected with the processor 81 to be able to obtain the detection result of the detection assembly 7 through the processor 81, and further judge the fault type by means of the real-time detection result.

[0061] It should be noted that the type of the fault diagnostic device 82 is not limited, as long as the above-mentioned functions can be realized, for example, in some embodiments, the fault diagnostic device 82 includes a diagnostic device body and a storage, the storage stores a plurality of pressure characteristic data of fault working conditions, such as threshold values, and the diagnostic device body is signal connected with the storage, so as to be able to call the plurality of pressure characteristic data of the fault working conditions stored, the diagnostic device body is further signal connected with the processor 81, so as to be able to obtain the detection data of the pressure detector through the processor 81, compare and confirm the detection data with the called pressure characteristic data, and judge to be able to output the fault type, such as the vacuum system leaking or clogging.

[0062] In some embodiments, the fault diagnostic device 82 has a logic judgment unit, for example, the judgment logic of the logic judgment unit includes that when the position detector reaches the corresponding vacuum standard and the detection result of the pressure detector does not reach the corresponding vacuum standard, the pressure detector fails or the vacuum system leaks, further, according to the change of the pressure detection result curve, the fault type is accurately judged, such as the pressure rapidly decreases, the fault type is judged as the vacuum system leaking, or the pressure change rate is extremely small, the fault type is judged as the pressure detector malfunctioning.

[0063] In summary, the vacuum system of the embodiment has the function of automatically judging the fault type, which is beneficial to improve the processing speed and fault judgment accuracy of abnormal working conditions, and reduce the professional requirements for the operator.

[0064] Further, the vacuum system further comprises a control terminal, and the controller 8 is wirelessly connected to the control terminal, so as to be capable of sending the detection result and / or the fault type to the control terminal, and capable of receiving the control signal transmitted by the control terminal, such as the emergency stop signal of the vacuum pump 1, thereby further improving the automation degree of the vacuum system.

[0065] On the basis of the above embodiment, the pressure relief control valve 5 is provided with a valve rod position detector 51 for detecting the valve rod position of the pressure relief control valve 5.

[0066] The valve rod position detector 51 is signal connected to the fault diagnoser 82.

[0067] The valve rod position detector 51 can adopt a limit switch or an optical sensor, etc., so as to be capable of determining whether the pressure relief control valve 5 is adjusted in place after the controller 8 controls the start or closing of the pressure relief control valve 5 by whether the valve rod position detector 51 detects the valve rod. For example, the valve rod position detector 51 adopts a limit switch and is arranged at the position where the valve body and the valve rod abut when moving to the closed position. When the pressure relief control valve 5 is controlled to be closed, if the valve rod abuts against the valve rod position detector 51, so that the valve rod position detector 51 outputs a detection signal, the valve rod is moved in place, otherwise it is not moved in place.

[0068] Correspondingly, the valve rod position detector 51 is signal connected to the fault diagnoser 82, so that the fault diagnoser 82 can receive the detection result of the valve rod position detector 51, and can accurately judge the fault type in combination with the diagnosis result of the valve rod position detector 51 for different fault conditions but similar characteristic data. For example, when the vacuum system is detected to be blocked, it can be determined whether it is caused by the fault of the pressure relief control valve 5 through the detection result of the valve rod position detector 51. By arranging the valve rod position detector 51, the accuracy of fault judgment can be further improved, so as to further help the operator to quickly confirm the factors causing the fault, and thus the maintenance of the vacuum system can be quickly and accurately completed.

[0069] On the basis of the above embodiment, the controller 8 has an alarm notifier 83, the alarm notifier 83 is signal connected to the fault diagnoser 82, and the alarm notifier 83 is used for receiving the fault type and outputting a corresponding alarm signal.

[0070] In the embodiment, the controller 8 is further provided with an alarm notifier 83, which can be an antenna or a light alarm, etc. The alarm notifier 83 is signal connected to the fault diagnoser 82. In use, after the fault diagnosis is completed by the fault diagnoser 82, the alarm notifier 83 receives the diagnosed fault type and outputs a corresponding alarm signal. The output of the alarm signal can include the light alarm turning on the light of a corresponding color and / or flashing at a corresponding frequency, or can also include the antenna transmitting the fault information to a control terminal, etc.

[0071] On the basis of the above embodiment, the low-pressure main pumping duct 2 has a first pumping duct section 21 and a second pumping duct section 22.

[0072] The first pumping duct section 21 is an L-shaped duct, and the first end structure of the first pumping duct section 21 extends in the vertical direction, and the top end thereof is used to connect the vacuum chamber in communication, and the second end structure extends in the horizontal direction.

[0073] One end of the main control valve 4 is connected to the first end of the first pumping duct section 21 in communication, and the other end is connected to the first end of the second pumping duct section 22 in communication, and the second end of the second pumping duct section 22 is connected to the vacuum pump 1 in communication.

[0074] The high-pressure sub-pumping duct 3 is an L-shaped duct, and the top structure of the high-pressure sub-pumping duct 3 extends in the horizontal direction and is connected to the first pumping duct section 21 in communication, and the bottom structure of the high-pressure sub-pumping duct 3 extends in the vertical direction and is connected to the second pumping duct section 22 in communication.

[0075] Specifically, please refer to Figure 1 and Figure 2 The low-pressure main pumping duct 2 connects the vacuum chamber through the upright L-shaped first pumping duct section 21. Specifically, the left side structure of the upright first pumping duct section 21 extends in the vertical direction, and the left top end extends upward and connects the vacuum chamber, and the right side structure extends in the horizontal direction, and the second pumping duct section 22 extends in the horizontal direction and the right end connects the vacuum pump 1. The main control valve 4 is arranged between the first pumping duct section 21 and the second pumping duct section 22, and the left end of the main control valve 4 connects the right end of the left side first pumping duct section 21, and the right end of the main control valve 4 connects the left end of the right side second pumping duct section 22.

[0076] In cooperation, the L-shaped high-pressure sub-pumping duct 3 is inverted. Specifically, the upper side structure of the high-pressure sub-pumping duct 3 extends in the horizontal direction and the left upper end is connected to the first pumping duct section 21, and the lower side structure of the high-pressure sub-pumping duct 3 extends in the vertical direction and the right lower end is connected to the second pumping duct section 22, so that the high-pressure sub-pumping duct 3 and the low-pressure main pumping duct 2 form a mouth-shaped structure.

[0077] On the basis of the above embodiment, the high-pressure sub-pumping duct 3 is further provided with a manual pressure relief valve 6.

[0078] Specifically, please refer to Figure 1 and Figure 2 The manual pressure relief valve 6 is arranged in series with the pressure relief control valve 5 in the high-pressure sub-air bleeding channel. In use, the manual pressure relief valve 6 is always open, and the opening and closing of the pressure relief control valve 5 can be regulated by the controller 8 to realize the regulation of the on-off of the high-pressure sub-pressure relief channel. After a failure occurs, the manual pressure relief valve 6 can be regulated to control the on-off of the high-pressure sub-pressure relief channel, so that normal production can be carried out after the pressure relief control valve 5 fails.

[0079] On the basis of the above embodiment, the main control valve 4 and the pressure relief control valve 5 are both pneumatic on-off valves, so as to ensure the pressure-bearing capacity of the high-pressure sub-air bleeding channel and the low-pressure sub-air bleeding channel, and to improve the production safety.

[0080] In some specific embodiments, a 150mm through hole is formed in the pipe wall of each end of the first pipe section, and the two ends of the high-pressure sub-air bleeding pipeline 3 are respectively inserted into the corresponding through holes and are connected to the first pipe section by full welding.

[0081] In addition to the above-mentioned vacuum system capable of automatic pressure relief, the present application also provides a vacuum circulating degassing refining equipment comprising the above-mentioned vacuum system capable of automatic pressure relief. The structures of other parts of the vacuum circulating degassing refining equipment are referred to the prior art, and will not be described here.

[0082] It should be noted that the relationship terms such as "first" and "second" described above are only used to distinguish one entity from other entities, and do not necessarily require or imply any actual relationship or order between the entities; the "upper surface, lower surface, top, bottom" described above and the orientation words "up, down, left, right" are defined based on the drawings.

[0083] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0084] The vacuum circulating degassing refining equipment and the vacuum system capable of automatic pressure relief provided by the present application are described in detail above. The principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be noted that those skilled in the art can make some improvements and modifications to the present application without departing from the principles of the present application. These improvements and modifications also fall within the protection scope of the present application.

Claims

1. A vacuum system capable of automatic pressure relief, used in a vacuum cycle degassing refining device to perform vacuumizing treatment on a vacuum chamber, comprising a vacuum pump (1) and a low-pressure main exhaust pipeline (2), a first end of the low-pressure main exhaust pipeline (2) being connected to the vacuum chamber of the vacuum cycle degassing refining device in a conductive manner, and a second end of the low-pressure main exhaust pipeline (2) being connected to the vacuum pump (1) in a conductive manner, characterized in that, Further comprising: a high-pressure sub-exhaust pipeline (3), a main control valve (4), a pressure relief control valve (5), a detection assembly (7) and a controller (8); The main control valve (4) is arranged in the low-pressure main exhaust pipeline (2) and is used for controlling the opening and closing of the low-pressure main exhaust pipeline (2); The high-pressure sub-exhaust pipeline (3) is connected in parallel with the first pipe section of the low-pressure main exhaust pipeline (2) provided with the main control valve (4), and the maximum working pressure of the high-pressure sub-exhaust pipeline (3) is greater than that of the low-pressure main exhaust pipeline (2); The pressure relief control valve (5) is arranged in the high-pressure sub-exhaust pipeline (3) and is used for controlling the opening and closing of the high-pressure sub-exhaust pipeline (3); The detection assembly (7) is used for detecting the working parameters of the vacuum circulation degassing refining equipment; The controller (8) is signal-connected with the vacuum pump (1), the detection assembly (7), the main control valve (4) and the pressure relief control valve (5), is used for receiving the detection results of the detection assembly (7) and controlling the opening and closing of the main control valve (4) and the pressure relief control valve (5) and the action of the vacuum pump (1), so as to control the pre-vacuumization through the high-pressure sub-exhaust pipeline (3) or the formal vacuumization through the low-pressure main exhaust pipeline (2).

2. The self-relieving vacuum system of claim 1, wherein, The detection assembly (7) comprises a position detector, and the position detector is used for detecting the jacking position of the ladle.

3. The self-relieving vacuum system of claim 2, wherein, The detection assembly (7) comprises a pressure detector, and the pressure detector is used for detecting the air pressure in the automatic pressure relief vacuum system.

4. The self-relieving vacuum system of claim 3, wherein, The controller (8) has a processor (81) and a fault diagnoser (82); The processor (81) is signal-connected with the vacuum pump (1), the detection assembly (7), the main control valve (4) and the pressure relief control valve (5); The fault diagnoser (82) is signal-connected with the processor (81), is used for receiving the pressure data and the detection data of the pressure detector, and outputs a fault type.

5. The self-relieving vacuum system of claim 4, wherein, The pressure relief control valve (5) is provided with a valve rod position detector (51) and is used for detecting the valve rod position of the pressure relief control valve (5); The valve rod position detector (51) is signal-connected with the fault diagnoser (82).

6. The self-relieving vacuum system of claim 5, wherein, The controller (8) has an alarm notifier (83), the alarm notifier (83) is signal-connected with the fault diagnoser (82), and the alarm notifier (83) is used for receiving the fault type and outputting a corresponding alarm signal.

7. The self-relieving vacuum system of claim 2, wherein, The low-pressure main exhaust pipeline (2) has a first exhaust pipe section (21) and a second exhaust pipe section (22); The first exhaust pipe section (21) is an L-shaped pipeline, a first end structure of the first exhaust pipe section (21) extends in a vertical direction, and a top end thereof is used for connecting the vacuum chamber in a conductive mode; and a second end structure extends in a horizontal direction; One end of the main control valve (4) is connected to the first end of the first exhaust pipe section (21) in a conductive mode, the other end is connected to the first end of the second exhaust pipe section (22) in a conductive mode, and the second end of the second exhaust pipe section (22) is connected to the vacuum pump (1) in a conductive mode; The high-pressure sub-exhaust pipeline (3) is an L-shaped pipeline, and a top structure of the high-pressure sub-exhaust pipeline (3) extends in a transverse direction and is connected to the first exhaust pipeline section (21) in a conductive mode, and a bottom structure of the high-pressure sub-exhaust pipeline (3) extends in a vertical direction and is connected to the second exhaust pipeline section (22) in a conductive mode.

8. The self-relieving vacuum system of claim 2, wherein, The high-pressure sub-exhaust pipeline (3) is further provided with a manual pressure relief valve (6).

9. The self-relieving vacuum system of claim 2, wherein, The main control valve (4) and the pressure relief control valve (5) are both pneumatic on-off valves.

10. A vacuum cycle degassing refining apparatus, characterized by A vacuum system capable of automatic pressure relief, comprising any one of the above claims 1-9.

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