Liquid pipe ice plug freeze isolation device

Abstract

The application relates to a liquid pipeline ice plug freezing isolation device, which comprises a control cabinet, a three-way electromagnetic valve, a computer and a flowmeter installed in the control cabinet, a liquid nitrogen tank trolley detachably connected with the control cabinet, a liquid nitrogen tank placed on the liquid nitrogen tank trolley, an ice plug jacket and a camera device; the ice plug jacket is wrapped on the outer surface of the liquid pipeline; the three-way electromagnetic valve inlet is connected with the liquid nitrogen tank outlet pipeline; the three-way electromagnetic valve outlet is connected with the ice plug jacket inlet pipeline; the pipeline, in which the three-way electromagnetic valve inlet is connected with the liquid nitrogen tank outlet, is provided with the flowmeter; the camera device is detachably installed on the outer side of the ice plug jacket; the computer is wirelessly communicated with the camera device, the three-way electromagnetic valve and the flowmeter respectively. The liquid pipeline ice plug freezing isolation device has high integration degree, can automatically monitor the frost line length of the liquid pipeline surface and the liquid nitrogen flow, and can automatically adjust the opening degree of the liquid nitrogen valve to adjust the liquid nitrogen flow.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power operation and maintenance, in particular to a liquid pipeline ice plug freezing isolation device. BACKGROUND

[0002] The ice plug freezing isolation technology is to install an ice plug jacket on the periphery of a liquid pipeline, inject liquid nitrogen into the ice plug jacket, and make the liquid nitrogen vaporize and absorb heat to solidify the liquid in the pipeline, so that the pipeline can be welded and replaced for maintenance. Compared with the traditional mechanical isolation technology, the ice plug freezing isolation technology has the advantages of safety, environmental protection, simple operation and small interference to the medium in the pipeline, and has gradually been recognized by the industry. However, the corresponding ice plug freezing isolation device has poor integration, cannot automatically adjust the liquid nitrogen flow and detect the freezing condition of the pipeline liquid. SUMMARY

[0003] Therefore, it is necessary to provide a liquid pipeline ice plug freezing isolation device to solve the problems of poor integration, inability to automatically adjust the liquid nitrogen flow and detect the freezing condition of the pipeline liquid of the existing liquid pipeline ice plug freezing isolation device. The device has high integration, automatically monitors the frost line length on the surface of the liquid pipeline and the liquid nitrogen flow, and automatically adjusts the opening of the liquid nitrogen valve to adjust the liquid nitrogen flow.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme:

[0005] A liquid pipeline ice plug freezing isolation device, comprising a control cabinet, a three-way electromagnetic valve, a computer and a flowmeter installed in the control cabinet, a liquid nitrogen tank cart detachably connected with the control cabinet, a liquid nitrogen tank placed on the liquid nitrogen tank cart, an ice plug jacket, and a camera device;

[0006] The ice plug jacket is wrapped around the outer surface of the liquid pipeline, the three-way electromagnetic valve inlet is connected with the liquid nitrogen tank outlet pipeline, the three-way electromagnetic valve outlet is connected with the ice plug jacket inlet pipeline, and the pipeline connecting the three-way electromagnetic valve inlet with the liquid nitrogen tank outlet is provided with a flowmeter;

[0007] The camera device is detachably installed on the outside of the ice plug jacket and is used for shooting and saving the frost line video on the surface of the liquid pipeline;

[0008] The flowmeter is used for measuring the liquid nitrogen flow at the three-way electromagnetic valve inlet and saving the measurement result;

[0009] The three-way electromagnetic valve saves the opening information of the three-way electromagnetic valve inlet;

[0010] The computer is respectively wirelessly connected with the camera, the three-way electromagnetic valve and the flow meter, is respectively used for obtaining liquid pipeline surface frost line video information, three-way electromagnetic valve entrance opening degree information and three-way electromagnetic valve entrance liquid nitrogen flow information, calculates liquid pipeline surface frost line length information according to liquid pipeline surface frost line video information, controls three-way electromagnetic valve entrance opening degree according to liquid pipeline surface frost line length information, three-way electromagnetic valve entrance opening degree information and three-way electromagnetic valve entrance liquid nitrogen flow information.

[0011] Working principle: start the camera, three-way electromagnetic valve, flow meter and computer; camera shoots liquid pipeline surface frost line video and saves, flow meter measures three-way electromagnetic valve entrance liquid nitrogen flow and saves; computer obtains liquid pipeline surface frost line video information, three-way electromagnetic valve entrance liquid nitrogen flow and three-way electromagnetic valve opening degree information, calculates liquid pipeline surface frost line length information according to liquid pipeline surface frost line video information, thereby automatically monitors liquid pipeline surface frost line length information, three-way electromagnetic valve entrance liquid nitrogen flow information and three-way electromagnetic valve entrance opening degree information;

[0012] In the liquid pipeline refrigeration stage, the computer adjusts three-way electromagnetic valve entrance opening degree to adjust three-way electromagnetic valve entrance liquid nitrogen flow, so that liquid pipeline surface frost line length increases at a stable speed, thereby keeping liquid temperature in the liquid pipeline to drop at a stable speed;

[0013] In the liquid pipeline maintenance stage, the computer adjusts three-way electromagnetic valve entrance opening degree to adjust three-way electromagnetic valve entrance liquid nitrogen flow, so that liquid pipeline surface frost line length is unchanged, thereby keeping the strength of ice plug stable, and providing more safe maintenance time for liquid pipeline maintenance personnel.

[0014] Further, the computer is installed with liquid pipeline surface frost line length control system, and the liquid pipeline surface frost line length control system comprises:

[0015] Frost line length calculation module, used for obtaining liquid pipeline surface frost line video information, calculating liquid pipeline surface frost line length information and sending frost line length control module;

[0016] Liquid nitrogen valve information acquisition module, used for obtaining three-way electromagnetic valve entrance liquid nitrogen flow information and three-way electromagnetic valve entrance opening degree information and sending frost line length control module;

[0017] Frost line length control module, used for receiving liquid pipeline surface frost line length information, three-way electromagnetic valve entrance liquid nitrogen flow information and three-way electromagnetic valve entrance opening degree information, adjusting three-way electromagnetic valve entrance opening degree according to liquid pipeline surface frost line length information, three-way electromagnetic valve entrance liquid nitrogen flow information and three-way electromagnetic valve entrance opening degree information.

[0018] Further, the camera is provided with a first power module and a first wireless communication module, the first power module provides power for the camera, and the camera is connected with the computer through the first wireless communication module.

[0019] Further, the ice plug jacket is a detachable cylinder, comprising a concentric inner hollow cylinder and an outer hollow cylinder, a cavity formed between the inner hollow cylinder and the outer hollow cylinder through two ends, and a flow channel arranged in the cavity.

[0020] The inner surface of the inner hollow cylinder is connected with the outer surface of the liquid pipeline; one end of the ice plug jacket is provided with an inlet penetrating the flow channel, and the other end is provided with an outlet penetrating the flow channel; the inlet of the ice plug jacket is connected with the outlet pipeline of the three-way electromagnetic valve.

[0021] Further, the ice plug jacket comprises two axially symmetrical half cylinders; the half cylinder comprises a concentric inner half hollow cylinder and an outer half hollow cylinder, a closed cavity formed between the inner half hollow cylinder and the outer half hollow cylinder through two axial ends and two radial ends, and a flow channel arranged in the cavity.

[0022] One radial end of the half cylinder is provided with an inlet penetrating one port of the half cylinder flow channel, and the other radial end is provided with an outlet penetrating the other port of the half cylinder flow channel.

[0023] The outer surfaces of the two axial ends of the half cylinder are connected to form a cylinder and are fixed by buckling; one inlet of the ice plug jacket is connected with one outlet pipeline of the three-way electromagnetic valve, and the other inlet is connected with the other outlet pipeline of the three-way electromagnetic valve.

[0024] Further, one inlet of the ice plug jacket is connected with one outlet of the three-way electromagnetic valve through a first metal hose and a fourth metal hose; the other inlet of the ice plug jacket is connected with the other outlet of the three-way electromagnetic valve through a second metal hose and a fifth metal hose; the liquid nitrogen tank is provided with a penetrating outlet, and the outlet of the liquid nitrogen tank is connected with the inlet of the three-way electromagnetic valve through a third metal hose and a sixth metal hose.

[0025] Further, one end of the first metal hose, the second metal hose, the third metal hose, the fourth metal hose, the fifth metal hose and the sixth metal hose is provided with an internal thread, and the other end is provided with a quick connector; the outer side of the control cabinet is provided with a first quick plug, a second quick plug and a third quick plug, and the outlet of the liquid nitrogen tank is provided with a fourth quick plug; the inlet of the ice plug, the outlet of the three-way electromagnetic valve and the inlet of the three-way electromagnetic valve are provided with external threads; the external threads match the internal threads; the first quick plug, the second quick plug, the third quick plug and the fourth quick plug match the quick connector.

[0026] The first metal hose is connected with one end of an ice plug jacket and one inlet thread, and the other end is connected with a first quick plug on the control cabinet; the fourth metal hose is connected with the other end of the first quick plug on the control cabinet and one outlet thread of a three-way electromagnetic valve;

[0027] The second metal hose is connected with the other end of the ice plug jacket and the other inlet thread, and the other end is connected with a second quick plug on the control cabinet; the fifth metal hose is connected with the other end of the second quick plug on the control cabinet and the other outlet thread of the three-way electromagnetic valve;

[0028] The third metal hose is connected with a fourth quick plug of the liquid nitrogen tank outlet and a third quick plug on the control cabinet; the sixth metal hose is connected with the third quick plug on the control cabinet and an inlet thread of the three-way electromagnetic valve;

[0029] A flow meter and a flow display are arranged on the pipeline connected with the sixth metal hose.

[0030] Further, the three-way electromagnetic valve is internally provided with a first integrated chip, and the first integrated chip is internally provided with a second wireless communication module, a first data acquisition module and a second power module;

[0031] The first data acquisition module is used for collecting the opening degree information of the three-way electromagnetic valve inlet; and the second power module provides power supply for the three-way electromagnetic valve and the first integrated chip;

[0032] The first integrated chip is wirelessly connected with a computer through the internal second wireless communication module.

[0033] Further, the flow meter is internally provided with a second integrated chip, and the second integrated chip is internally provided with a third wireless communication module, a second data acquisition module and a third power module;

[0034] The second data acquisition module is used for collecting the liquid nitrogen flow information of the three-way electromagnetic valve inlet; and the third power module provides power supply for the flow meter and the second integrated chip;

[0035] The second integrated chip is wirelessly connected with a computer through the internal third wireless communication module.

[0036] In one of the embodiments, the liquid pipeline ice plug freezing isolation device further comprises a flow display installed in the control cabinet;

[0037] The flow display is installed on the pipeline connected with the three-way electromagnetic valve inlet and the liquid nitrogen tank outlet;

[0038] The flow display is wirelessly connected with the flow meter, and is used for displaying the liquid nitrogen flow information of the three-way electromagnetic valve inlet.

[0039] Further, the computer and the flow display are powered by an external power source.

[0040] Further, the liquid pipeline ice plug freezing isolation device further comprises a touch panel installed on the outside of the control cabinet; the touch panel is a full touch screen without a keyboard and a mouse; the touch panel is in wireless communication connection with the computer.

[0041] The computer is further configured to send the liquid pipeline surface frost line length information, the three-way electromagnetic valve inlet liquid nitrogen flow information and the three-way electromagnetic valve inlet opening degree information to the touch panel.

[0042] The touch panel is configured to receive the liquid pipeline surface frost line length information, the three-way electromagnetic valve inlet liquid nitrogen flow information and the three-way electromagnetic valve inlet opening degree information sent by the computer and display.

[0043] Further, the liquid nitrogen tank trolley is provided with a hydraulic jack; the hydraulic jack is detachably connected with the liquid nitrogen tank; the liquid nitrogen tank is lifted in the air by the hydraulic jack on the liquid nitrogen tank trolley, so that the liquid nitrogen tank is conveniently detached and carried.

[0044] Further, the liquid pipeline ice plug freezing isolation device further comprises a pipeline support and a flange; the liquid pipeline is placed on the pipeline support, and the flange is installed at each end of the liquid pipeline.

[0045] The beneficial technical effects of the present application are as follows:

[0046] The liquid pipeline ice plug freezing isolation device has high integration degree, is convenient to install, disassemble and carry, and improves the liquid pipeline maintenance efficiency; the liquid pipeline surface frost line length, the three-way electromagnetic valve inlet opening degree and the three-way electromagnetic valve inlet liquid nitrogen flow are automatically monitored; in the liquid pipeline refrigeration stage, the three-way electromagnetic valve inlet liquid nitrogen flow is adjusted by automatically adjusting the three-way electromagnetic valve inlet opening degree, so that the liquid temperature in the liquid pipeline decreases at a stable speed, thereby protecting the liquid pipeline from being frozen; in the liquid pipeline maintenance stage, the ice plug strength is stabilized by automatically adjusting the three-way electromagnetic valve inlet liquid nitrogen flow by automatically adjusting the three-way electromagnetic valve inlet opening degree, thereby providing more safe maintenance time for the liquid pipeline maintenance personnel. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 FIG. 1 is a structural schematic diagram of the liquid pipeline ice plug freezing isolation device of the present application;

[0048] Figure 2 FIG. 2 is a structural schematic diagram of the control cabinet;

[0049] Figure 3 FIG. 3 is a structural schematic diagram of the liquid nitrogen tank trolley;

[0050] Figure 4It is a schematic diagram of the camera structure.

[0051] Figure 5 It is a schematic diagram of the quick connector structure.

[0052] In the figure, 1, liquid pipeline; 2, pipeline support; 3, camera; 4, ice plug jacket; 5, first metal hose; 6, second metal hose; 7, flange; 8, touch panel; 9, three-way electromagnetic valve; 10, control cabinet; 11, flow display; 12, computer; 13, flow meter; 14, liquid nitrogen tank cart; 15, liquid nitrogen tank; 16, hydraulic jack; 17, third metal hose; 18, first quick plug; 19, second quick plug; 20, third quick plug. DETAILED DESCRIPTION

[0053] The technical solutions of the present application will be described clearly and completely below in combination with the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0054] In the description of the present application, it should be noted that the terms "left end", "right end", "upper", "lower", "outer side", "inner side" 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 elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0055] In addition, the terms "first", "second", "third", "fourth", "fifth" and "sixth" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] Example 1

[0057] The present embodiment provides a liquid pipeline ice plug freezing isolation device, which comprises a control cabinet 10, a three-way electromagnetic valve 9, a computer 12 and a flow meter 13 installed inside the control cabinet 10, a liquid nitrogen tank cart 14 detachably connected with the control cabinet 10, a liquid nitrogen tank 15 placed on the liquid nitrogen tank cart 14, an ice plug jacket 4, and a camera 3;

[0058] The ice plug jacket 4 is wrapped around the outer surface of the liquid pipeline 1, the three-way electromagnetic valve 9 inlet is connected with the liquid nitrogen tank 15 outlet pipeline, the three-way electromagnetic valve 9 outlet is connected with the ice plug jacket 4 inlet pipeline, and the pipeline connecting the three-way electromagnetic valve 9 inlet with the liquid nitrogen tank 15 outlet is provided with a flow meter 13;

[0059] The camera 3 is detachably installed outside the ice plug jacket 4, used for shooting liquid pipeline surface frost line video and saving the liquid pipeline surface frost line video information;

[0060] The flowmeter 13 is used for measuring three-way electromagnetic valve inlet liquid nitrogen flow and saving the three-way electromagnetic valve inlet liquid nitrogen flow information;

[0061] The three-way electromagnetic valve 9 saves three-way electromagnetic valve inlet opening degree information;

[0062] The computer 12 is respectively wirelessly communicated with the camera 3, the three-way electromagnetic valve 9 and the flowmeter 13, respectively used for acquiring the liquid pipeline surface frost line video information, the three-way electromagnetic valve inlet opening degree information and the three-way electromagnetic valve inlet liquid nitrogen flow information, calculating liquid pipeline surface frost line length information according to the liquid pipeline surface frost line video information, and controlling three-way electromagnetic valve 9 inlet opening degree according to the liquid pipeline surface frost line length information, the three-way electromagnetic valve inlet opening degree information and the three-way electromagnetic valve inlet liquid nitrogen flow information.

[0063] Further, the computer 12 is installed with liquid pipeline surface frost line length control system, the liquid pipeline surface frost line length control system comprises:

[0064] Frost line length calculation module, used for acquiring liquid pipeline surface frost line video information, calculating liquid pipeline surface frost line length information and sending frost line length control module;

[0065] Liquid nitrogen valve information acquisition module, used for acquiring three-way electromagnetic valve inlet liquid nitrogen flow information and three-way electromagnetic valve inlet opening degree information and sending frost line length control module;

[0066] Frost line length control module, used for receiving the liquid pipeline surface frost line length information, three-way electromagnetic valve inlet liquid nitrogen flow information and three-way electromagnetic valve inlet opening degree information, and adjusting the three-way electromagnetic valve 9 inlet opening degree according to the liquid pipeline surface frost line length information, three-way electromagnetic valve inlet liquid nitrogen flow information and three-way electromagnetic valve inlet opening degree information.

[0067] Further, the camera 3 is built-in first power module and first wireless communication module, the first power module provides power supply for the camera 3, and the camera 3 is wirelessly communicated with the computer 12 through the built-in first wireless communication module.

[0068] Further, the ice plug jacket 4 is a detachable cylinder, comprising concentric inner hollow cylinder and outer hollow cylinder, cavity formed by two ends connection between the inner hollow cylinder and the outer hollow cylinder, and flow channel arranged in the cavity;

[0069] The inner hollow cylinder inner surface is connected with the liquid pipeline outer surface; the ice plug jacket 4 is provided with an inlet penetrating the flow channel at one end and an outlet penetrating the flow channel at the other end; the ice plug jacket 4 inlet is connected with the three-way electromagnetic valve 9 outlet pipeline.

[0070] Further, the ice plug jacket 4 comprises two axially symmetrical half cylinders; the half cylinder comprises a concentric inner half hollow cylinder and an outer half hollow cylinder, the inner half hollow cylinder and the outer half hollow cylinder are connected by axial two ends and radial two ends to form a closed cavity, and a flow channel is arranged in the cavity;

[0071] One radial end of the half cylinder is provided with an inlet penetrating one port of the half cylinder flow channel, and the other radial end is provided with an outlet penetrating the other port of the half cylinder flow channel;

[0072] The axial end outer surfaces of the two half cylinders are connected to form a cylinder and are fixed by buckling;

[0073] One inlet of the ice plug jacket 4 is connected with one outlet of the three-way electromagnetic valve 9, and the other inlet is connected with the other outlet of the three-way electromagnetic valve 9.

[0074] Further, one inlet of the ice plug jacket 4 is connected with one outlet of the three-way electromagnetic valve 9 through the first metal hose 5 and the fourth metal hose; the other inlet of the ice plug jacket 4 is connected with the other outlet of the three-way electromagnetic valve 9 through the second metal hose 6 and the fifth metal hose; the liquid nitrogen tank 15 is provided with a penetrating outlet, and the liquid nitrogen tank 15 outlet is connected with the three-way electromagnetic valve 9 inlet through the third metal hose 17 and the sixth metal hose.

[0075] Further, one end of the first metal hose 5, the second metal hose 6, the third metal hose 17, the fourth metal hose, the fifth metal hose and the sixth metal hose is provided with an internal thread, and the other end is provided with a quick connector; the control cabinet 10 is provided with a first quick connector 18, a second quick connector 19 and a third quick connector 20 on the outside, and the liquid nitrogen tank 15 outlet is provided with a fourth quick connector; the ice plug jacket 4 inlet, the three-way electromagnetic valve 9 outlet and the three-way electromagnetic valve 9 inlet are all provided with external threads; the external threads match the internal threads; the first quick connector 18, the second quick connector 19, the third quick connector 20 and the fourth quick connector match the quick connectors;

[0076] One end of the first metal hose 5 is threadedly connected with one inlet of the ice plug jacket 4, and the other end is connected with the first quick connector 18 on the control cabinet 10; one end of the fourth metal hose is connected with the first quick connector 18 on the control cabinet 10, and the other end is threadedly connected with one outlet of the three-way electromagnetic valve 9;

[0077] The second metal hose 6 is connected with the other end of the ice plug jacket 4 through the other end of the second quick plug 19 on the control cabinet 10; the fifth metal hose is connected with the other end of the second quick plug 19 on the control cabinet 10 through the other end of the three-way electromagnetic valve 9;

[0078] The third metal hose 17 is connected with the fourth quick plug on the outlet of the liquid nitrogen tank 15 through the other end of the third quick plug 20 on the control cabinet 10; the sixth metal hose is connected with the other end of the third quick plug 20 on the control cabinet 10 through the other end of the three-way electromagnetic valve 9;

[0079] The three-way electromagnetic valve 9 is provided with a flow meter 13 and a flow display 11 on the pipeline connected with the sixth metal hose.

[0080] Further, the three-way electromagnetic valve 9 is provided with a first integrated chip inside, and the first integrated chip is provided with a second wireless communication module, a first data acquisition module and a second power module inside;

[0081] The first data acquisition module is used for collecting the opening degree information of the three-way electromagnetic valve 9; the second power module provides power supply for the three-way electromagnetic valve 9 and the first integrated chip;

[0082] The first integrated chip is wirelessly connected with the computer 12 through the second wireless communication module inside.

[0083] Further, the flow meter 13 is provided with a second integrated chip inside, and the second integrated chip is provided with a third wireless communication module, a second data acquisition module and a third power module inside;

[0084] The second data acquisition module is used for collecting the liquid nitrogen flow information of the three-way electromagnetic valve; the third power module provides power supply for the flow meter 13 and the second integrated chip;

[0085] The second integrated chip is wirelessly connected with the computer 12 through the third wireless communication module inside.

[0086] Further, the liquid pipeline ice plug freezing isolation device further comprises a flow display 11 installed in the control cabinet 10;

[0087] The flow display 11 is installed on the pipeline connected with the three-way electromagnetic valve 9 and the outlet of the liquid nitrogen tank 15;

[0088] The flow display 11 is wirelessly connected with the flow meter 13, and is used for displaying the liquid nitrogen flow of the three-way electromagnetic valve.

[0089] Further, the flow display 11 and the computer 12 are powered by an external power supply.

[0090] In one embodiment, the liquid pipeline ice plug frozen isolation device further comprises a touch panel 8 installed on the outside of the control cabinet 10; the touch panel 8 is a full touch screen without keyboard and mouse; the touch panel 8 is wirelessly connected with the computer 12;

[0091] The computer 12 is further configured to send liquid pipeline surface frost line length information, three-way electromagnetic valve inlet liquid nitrogen flow information and three-way electromagnetic valve inlet opening degree information to the touch panel 8; the touch panel 8 is configured to receive the liquid pipeline surface frost line length information, three-way electromagnetic valve inlet liquid nitrogen flow information and three-way electromagnetic valve inlet opening degree information sent by the computer 12 and display.

[0092] Further, the liquid nitrogen tank cart 14 is provided with a hydraulic jack 16; the hydraulic jack 16 is detachably connected with the liquid nitrogen tank 15; the liquid nitrogen tank 15 is lifted in the air by the hydraulic jack 16 on the liquid nitrogen tank cart 14, facilitating disassembly and transportation.

[0093] Further, the liquid pipeline ice plug frozen isolation device further comprises a pipeline support 2 and a flange 7; the liquid pipeline 1 is placed on the pipeline support 2, and the flanges 7 are respectively installed at both ends of the liquid pipeline 1.

[0094] The liquid pipeline ice plug frozen isolation device is used for liquid pipeline ice plug frozen plugging, and comprises the following steps:

[0095] The camera 3, the three-way electromagnetic valve 9, the flow display 11, the flow meter 13 and the computer 12 are started;

[0096] The camera 3 shoots liquid pipeline surface frost line video and saves the liquid pipeline surface frost line video information, the flow meter 13 measures three-way electromagnetic valve inlet liquid nitrogen flow and saves the three-way electromagnetic valve inlet liquid nitrogen flow information, and the flow display 11 displays the three-way electromagnetic valve inlet liquid nitrogen flow;

[0097] The computer 12 acquires liquid pipeline surface frost line video information of the camera 3, three-way electromagnetic valve inlet liquid nitrogen flow information of the flow meter 13 and inlet opening degree information of the three-way electromagnetic valve 9, calculates liquid pipeline surface frost line length information according to the liquid pipeline surface frost line video information, thereby automatically monitoring liquid pipeline surface frost line length, three-way electromagnetic valve inlet liquid nitrogen flow and three-way electromagnetic valve inlet opening degree;

[0098] In the liquid pipeline refrigeration stage, the computer 12 adjusts the three-way electromagnetic valve inlet liquid nitrogen flow by adjusting the three-way electromagnetic valve 9 inlet opening degree, so that the liquid pipeline surface frost line length increases at a stable speed, thereby keeping the liquid temperature in the liquid pipeline to decrease at a stable speed.

[0099] In the liquid pipeline maintenance stage, the computer 12 adjusts the liquid nitrogen flow at the three-way electromagnetic valve inlet by adjusting the three-way electromagnetic valve inlet opening degree, so that the liquid pipeline surface frost line length is unchanged, thereby keeping the ice plug strength stable and providing more safe maintenance time for the liquid pipeline maintenance personnel.

[0100] Precise control of the liquid ammonia flow size is the key to maintaining the stable growth of the liquid pipeline surface frost line length. By precisely controlling the liquid ammonia flow size, the ice plug jacket 4 temperature drops linearly, and when the required value is reached, it can be stabilized around the value without large fluctuations. Different pipelines have different frost line growth rates. Taking a 3.5-inch pipeline as an example, the frost line increases by 3 cm / h, and the liquid nitrogen flow at the three-way electromagnetic valve inlet is in the range of 7 L / h, and the three-way electromagnetic valve inlet opening degree is in the range of 0-180°.

[0101] The liquid pipeline ice plug freezing isolation device of the embodiment has high integration degree. The three-way electromagnetic valve 9, the flow display 11, the computer 12, and the flow meter 13 are integrated in the control cabinet 10. The liquid nitrogen tank cart 14 is connected with the control cabinet 10, the liquid nitrogen tank 15 is placed on the liquid nitrogen tank cart 14, the installation time of the device is saved, and the device is convenient to carry as a whole during the liquid pipeline maintenance stage. The liquid nitrogen tank cart 14 and the control cabinet 10 are detachably connected, the ice plug jacket 4 and the camera device 3 are detachably connected, and the hydraulic jack 16 and the liquid nitrogen tank 15 are detachably connected, so that the device is convenient to install and disassemble, the installation time of the device is saved, the liquid pipeline surface frost line length control system automatically monitors the liquid pipeline surface frost line length, the three-way electromagnetic valve inlet opening degree, and the liquid nitrogen flow at the three-way electromagnetic valve inlet. In the liquid pipeline refrigeration stage, the liquid pipeline surface frost line length control system adjusts the liquid nitrogen flow at the three-way electromagnetic valve inlet by automatically adjusting the three-way electromagnetic valve 9 inlet opening degree, so that the liquid temperature in the liquid pipeline decreases at a stable speed, thereby protecting the liquid pipeline from being frozen. In the liquid pipeline maintenance stage, the liquid pipeline surface frost line length control system adjusts the liquid nitrogen flow at the three-way electromagnetic valve inlet by automatically adjusting the three-way electromagnetic valve 9 inlet opening degree, so that the ice plug strength is stable, thereby providing more safe maintenance time for the liquid pipeline maintenance personnel.

[0102] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A liquid pipe ice plug freeze isolation device, characterized by, The application relates to a liquid pipe surface frost line length control system, which comprises a control cabinet (10), a three-way electromagnetic valve (9) installed in the control cabinet (10), a computer (12) and a flowmeter (13), a liquid nitrogen tank cart (14) detachably connected with the control cabinet (10), a liquid nitrogen tank (15) placed on the liquid nitrogen tank cart (14), an ice plug jacket (4) and a camera device (3); the ice plug jacket (4) is wrapped on the outer surface of a liquid pipe (1), the inlet of the three-way electromagnetic valve (9) is connected with the outlet pipeline of the liquid nitrogen tank (15), the outlet of the three-way electromagnetic valve (9) is connected with the inlet pipeline of the ice plug jacket (4), and the pipeline, wherein the inlet of the three-way electromagnetic valve (9) is connected with the outlet of the liquid nitrogen tank (15), is provided with the flowmeter (13); the camera device (3) is detachably installed on the outer side of the ice plug jacket (4) and is used for shooting liquid pipe surface frost line video and saving; the flowmeter (13) is used for measuring and keeping the liquid nitrogen flow at the inlet of the three-way electromagnetic valve; the three-way electromagnetic valve (9) saves the inlet opening degree information of the three-way electromagnetic valve; the computer (12) is in wireless communication connection with the camera device (3), the three-way electromagnetic valve (9) and a flow display (11) respectively and is used for acquiring liquid pipe surface frost line video information, three-way electromagnetic valve inlet opening degree information and three-way electromagnetic valve inlet liquid nitrogen flow information, calculating liquid pipe surface frost line length information according to the liquid pipe surface frost line video information, and controlling the inlet opening degree of the three-way electromagnetic valve (9) according to the liquid pipe surface frost line length information, the three-way electromagnetic valve inlet opening degree information and the three-way electromagnetic valve inlet liquid nitrogen flow information; The computer (12) is provided with a liquid pipe surface frost line length control system, and the liquid pipe surface frost line length control system comprises: a frost line length calculation module which is used for acquiring liquid pipe surface frost line video information, calculating liquid pipe surface frost line length information and sending the frost line length control module; a liquid nitrogen valve information acquisition module which is used for acquiring three-way electromagnetic valve inlet liquid nitrogen flow information and three-way electromagnetic valve inlet opening degree information and sending the frost line length control module; a frost line length control module which is used for receiving the liquid pipe surface frost line length information, the three-way electromagnetic valve inlet liquid nitrogen flow information and the three-way electromagnetic valve inlet opening degree information, adjusting the inlet opening degree of the three-way electromagnetic valve (9) according to the liquid pipe surface frost line length information, the three-way electromagnetic valve inlet liquid nitrogen flow information and the three-way electromagnetic valve inlet opening degree information; the ice plug jacket (4) is a detachable cylinder which comprises a concentric inner hollow cylinder and an outer hollow cylinder, a cavity formed through the connection of two ends between the inner hollow cylinder and the outer hollow cylinder and a flow channel arranged in the cavity; the inner surface of the inner hollow cylinder is attached to the outer surface of the liquid pipe; one end of the ice plug jacket (4) is provided with an inlet which is connected with the flow channel, and the other end is provided with an outlet which is connected with the flow channel; the inlet of the ice plug jacket (4) is connected with the outlet pipeline of the three-way electromagnetic valve (9). The ice plug jacket (4) comprises two axially symmetrical half cylinders; the half cylinders comprise concentric inner and outer half hollow cylinders, the inner and outer half hollow cylinders are connected through axial and radial ends to form a closed cavity, and a flow channel is arranged in the cavity; one radial end of the half cylinder is provided with an inlet penetrating one port of the half cylinder flow channel, and the other radial end is provided with an outlet penetrating the other port of the half cylinder flow channel; the axial end outer surfaces of the two half cylinders are attached to form a cylinder and are fixed by buckling; one inlet of the ice plug jacket (4) is connected with one outlet pipeline of the three-way electromagnetic valve (9), and the other inlet is connected with the other outlet pipeline of the three-way electromagnetic valve (9); During the liquid pipeline refrigeration stage, the computer (12) adjusts the liquid nitrogen flow rate at the inlet of the three-way electromagnetic valve (9) by adjusting the inlet opening degree of the three-way electromagnetic valve (9), so that the length of the frost line on the surface of the liquid pipeline increases at a stable speed, thereby maintaining the temperature of the liquid in the liquid pipeline to decrease at a stable speed; during the liquid pipeline maintenance stage, the computer (12) adjusts the liquid nitrogen flow rate at the inlet of the three-way electromagnetic valve (9) by adjusting the inlet opening degree of the three-way electromagnetic valve (9), so that the length of the frost line on the surface of the liquid pipeline remains unchanged, thereby maintaining the strength of the ice plug stable.

2. The liquid-piping ice plug freeze isolation device of claim 1, wherein, One inlet of the ice plug jacket (4) is connected with one outlet of the three-way electromagnetic valve (9) through the first metal hose (5) and the fourth metal hose; the other inlet of the ice plug jacket (4) is connected with the other outlet of the three-way electromagnetic valve (9) through the second metal hose (6) and the fifth metal hose; the liquid nitrogen tank (15) is provided with a penetrating outlet, and the outlet of the liquid nitrogen tank (15) is connected with the inlet of the three-way electromagnetic valve (9) through the third metal hose (17) and the sixth metal hose.

3. The liquid-piping ice plug freeze isolation device of claim 2, wherein, One end of the first metal hose (5), the second metal hose (6), the third metal hose (17), the fourth metal hose, the fifth metal hose and the sixth metal hose is provided with an internal thread, and the other end is provided with a quick connector; The outside of the control cabinet (10) is provided with a first quick plug (18), a second quick plug (19) and a third quick plug (20), and the outlet of the liquid nitrogen tank (15) is provided with a fourth quick plug; The inlet of the ice plug jacket (4), the outlet of the three-way electromagnetic valve (9) and the inlet of the three-way electromagnetic valve (9) are all provided with an external thread; The external thread matches the internal thread; The first quick plug (18), the second quick plug (19), the third quick plug (20) and the fourth quick plug match the quick connector; One end of the first metal hose (5) is threadedly connected with one inlet of the ice plug jacket (4), and the other end is connected with the first quick plug (18) on the control cabinet (10); One end of the fourth metal hose is connected with the first quick plug (18) on the control cabinet (10), and the other end is threadedly connected with one outlet of the three-way electromagnetic valve (9); One end of the second metal hose (6) is threadedly connected with the other inlet of the ice plug jacket (4), and the other end is connected with the second quick plug (19) on the control cabinet (10); One end of the fifth metal hose is connected with the second quick plug (19) on the control cabinet (10), and the other end is threadedly connected with the other outlet of the three-way electromagnetic valve (9); One end of the third metal hose (17) is connected with the fourth quick plug of the outlet of the liquid nitrogen tank (15), and the other end is connected with the third quick plug (20) on the control cabinet (10); One end of the sixth metal hose is connected with the third quick plug (20) on the control cabinet (10), and the other end is threadedly connected with the inlet of the three-way electromagnetic valve (9); A flowmeter (13) and a flow display (11) are arranged on the pipeline connected with the sixth metal hose.

4. The liquid-piping ice plug freeze isolation device of claim 1, wherein, The camera (3) is provided with a first power module and a first wireless communication module, the first power module provides power for the camera (3), and the camera (3) is wirelessly connected with the computer (12) through the first wireless communication module.

5. The liquid-piping ice plug freeze isolation device of claim 1, wherein, The three-way electromagnetic valve (9) is provided with a first integrated chip inside, the first integrated chip is provided with a second wireless communication module, a first data acquisition module and a second power module inside; The first data acquisition module is used for acquiring inlet opening information of the three-way electromagnetic valve (9); The second power module provides power for the three-way electromagnetic valve (9) and the first integrated chip; The first integrated chip is wirelessly connected with the computer (12) through the second wireless communication module inside.

6. The liquid-piping ice plug freeze isolation device of claim 1, wherein, The flow meter (13) is internally provided with a second integrated chip, the second integrated chip is internally provided with a third wireless communication module, a second data acquisition module and a third power module; the second data acquisition module is used for collecting the liquid nitrogen flow information at the inlet of the three-way electromagnetic valve (9); the third power module provides power supply for the flow meter (13) and the second integrated chip; the second integrated chip is wirelessly communicated and connected with the computer (12) through the third wireless communication module.

7. The liquid-piping ice plug freeze isolation device of claim 1, wherein, The liquid pipeline ice plug freezing isolation device further comprises a flow display (11) installed in the control cabinet; the flow display (11) is installed on the pipeline connected between the inlet of the three-way electromagnetic valve (9) and the outlet of the liquid nitrogen tank (15); the flow display (11) is wirelessly communicated and connected with the flow meter (13) and is used for displaying the liquid nitrogen flow information at the inlet of the three-way electromagnetic valve.

8. The liquid-piping ice plug freeze isolation device of claim 7, wherein, The computer (12) and the flow display (11) are powered by an external power supply.

9. The liquid-piping ice plug freeze isolation device of claim 1, wherein, The liquid pipeline ice plug freezing isolation device further comprises a touch panel (8) installed on the outside of the control cabinet (10); the touch panel (8) is a full touch screen and is wirelessly communicated and connected with the computer (12); the computer (12) is further used for sending the liquid pipeline surface frost line length information, the three-way electromagnetic valve inlet liquid nitrogen flow information and the three-way electromagnetic valve inlet opening degree information to the touch panel (8); the touch panel (8) is used for receiving the liquid pipeline surface frost line length information, the three-way electromagnetic valve inlet liquid nitrogen flow information and the three-way electromagnetic valve inlet opening degree information sent by the computer (12) and displaying.

10. The liquid-piping ice plug freeze isolation device of claim 1, wherein, The liquid nitrogen tank cart (14) is provided with a hydraulic jack (16); the hydraulic jack (16) is detachably connected with the liquid nitrogen tank (15).

11. A liquid line ice plug freeze isolation device in accordance with any of claims 1-10, wherein, The liquid pipeline ice plug freezing isolation device further comprises a pipeline support (2) and a flange (7); the liquid pipeline (1) is placed on the pipeline support (2), and the liquid pipeline (1) is respectively provided with the flange (7) at both ends.

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