Vacuum maintaining and guaranteeing system

Abstract

The utility model provides a vacuum maintenance safeguard system, a heat insulation pipeline comprises an inner pipe and an outer pipe sleeved outside the inner pipe, a cavity is formed between the inner pipe and the outer pipe, the end part of the cavity in the length direction of the heat insulation pipeline is sealed, and the outer pipe is sleeved outside the inner pipe. The cavity is divided into a plurality of independent vacuum sections in the length direction of the heat insulation pipeline, each vacuum section is connected with one vacuum maintaining and safeguarding system through a jumper connection pipe, and each vacuum maintaining and safeguarding system comprises an electromagnetic valve and a vacuum pump. According to the vacuum maintaining and guaranteeing system, the cavity in the original heat insulation pipeline is designed in a segmented mode, in the normal use state, the connecting valves on the branch pipes between different vacuum maintaining and guaranteeing systems are closed, and the electromagnetic valves on the vacuum maintaining and guaranteeing systems are opened; vacuum pumps of different vacuum maintaining and guaranteeing systems are responsible for maintaining vacuum degrees in different vacuum sections, and the problem that the vacuum degrees are reduced after the heat insulation pipeline is used for a long time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum adiabatic pipelines, in particular to a vacuum maintenance guarantee system that can be used for double-layer vacuum liquid nitrogen transportation pipelines. Background Technique

[0002] The double-layer vacuum liquid nitrogen transportation pipeline is an adiabatic pipeline designed specifically for transporting cryogenic liquid nitrogen. It consists of an inner and an outer layer of stainless steel pipes. The inner pipe serves as the working pipeline and directly bears cryogenic liquids such as liquid nitrogen, while the outer pipe wraps around the outside of the inner pipe to form a cavity. Since the cavity between the inner and outer pipes is evacuated to a high vacuum state, a vacuum adiabatic layer is formed, thus greatly reducing the heat loss of cryogenic liquids during transportation. The two ends and connection parts of the pipeline adopt specially designed flanges or welding techniques to ensure good sealing of the entire pipeline system and prevent leakage of the vacuum layer. The double-layer vacuum liquid nitrogen transportation pipeline has been widely used in fields such as medical and health, food processing and preservation, as well as scientific research and semiconductor manufacturing.

[0003] The existing vacuum pipelines have the following problems during use:

[0004] 1. Currently, the vacuum pipelines mainly adopt a passive vacuum maintenance method. After long-term use, the vacuum degree of the vacuum insulation layer decreases, resulting in a significant decline in the insulation effect and the problem of dew condensation on the outer surface. In addition, the decline in the insulation effect easily causes the liquid nitrogen transported in the pipeline to vaporize, and the appearance of gas resistance in the pipeline greatly reduces the transportation efficiency of liquid nitrogen, exacerbating liquid nitrogen loss and energy consumption;

[0005] 2. Once the vacuum pipeline fails, the entire failed pipe section needs to be replaced, which affects the normal use of the system. During the construction period, the liquid supply will be interrupted, and the system needs to be restarted after re-testing, which may lead to production stagnation or research interruption, increasing economic losses or research delays.

[0006] To solve the above problems, the utility model proposes a vacuum maintenance guarantee system that can avoid the decline in vacuum degree after long-term use of the pipeline and the interruption of pipeline liquid supply during the maintenance of some vacuum pipelines. Content of the Utility Model

[0007] To solve the problems of the decline in vacuum degree after long-term use of the existing vacuum pipelines and the interruption of pipeline liquid supply during the maintenance of some vacuum pipelines, the utility model provides a vacuum maintenance guarantee system.

[0008] According to an object of the present utility model, the present utility model provides a vacuum maintenance guarantee system. The adiabatic pipeline includes an inner pipe and an outer pipe sleeved outside the inner pipe. A cavity is formed between the inner pipe and the outer pipe. The ends of the cavity in the length direction of the adiabatic pipeline are sealed. The cavity is divided into several independent vacuum sections along the length direction of the adiabatic pipeline. Each vacuum section is respectively connected to a vacuum maintenance guarantee system through a jumper pipe. The vacuum maintenance guarantee system includes: a solenoid valve and a vacuum pump, and the vacuum section, the solenoid valve and the vacuum pump are connected in sequence;

[0009] Two vacuum maintenance guarantee systems are connected to each other through a branch pipe. The branch pipe is located between the vacuum section and the solenoid valve, and a connection valve is arranged on the branch pipe.

[0010] Preferably, the vacuum maintenance guarantee system further includes:

[0011] A vacuum gauge tube, which is connected between the vacuum section and the solenoid valve;

[0012] A control box, which respectively controls the connection of the vacuum gauge tube, the solenoid valve and the vacuum pump.

[0013] Preferably, the vacuum maintenance guarantee system further includes: a vacuum meter, which is connected to the vacuum gauge tube.

[0014] Preferably, the vacuum maintenance guarantee system further includes:

[0015] An access valve, which is arranged between the vacuum maintenance guarantee system and the vacuum section.

[0016] Preferably, both the access valve and the connection valve are manually controlled.

[0017] Preferably, the number of vacuum pumps in the vacuum maintenance guarantee system is two, namely a main pump and a sub-pump. The main pump and the sub-pump are connected in parallel to the vacuum section, and the main pump and the sub-pump work in an alternating manner.

[0018] Preferably, the inner wall of the cavity is covered with heat insulating material.

[0019] Preferably, the number of adiabatic pipelines is multiple, and the adiabatic pipelines are connected in sequence along the length direction, and the cavities of adjacent adiabatic pipelines are connected to each other.

[0020] Compared with the prior art, the beneficial effects of the present utility model are:

[0021] The vacuum maintenance guarantee system divides the cavity in the original adiabatic pipeline into sections. In the normal use state, the connection valves on the branch pipes between different vacuum maintenance guarantee systems are closed, and the solenoid valves on the vacuum maintenance guarantee systems are opened. The vacuum pumps of different vacuum maintenance guarantee systems are responsible for maintaining the vacuum degree in different vacuum sections, solving the problem of the decline in vacuum degree after long-term use of the adiabatic pipeline;

[0022] When one of the vacuum maintenance guarantee systems needs to be maintained or repaired, the solenoid valve of this vacuum maintenance guarantee system is closed, and at the same time, the connection valve with another vacuum maintenance guarantee system is opened. The other vacuum maintenance guarantee system is connected to the two vacuum sections through the branch pipe to evacuate the two vacuum sections. After the vacuum maintenance guarantee system is maintained or repaired, the solenoid valve of this vacuum maintenance guarantee system is reopened, and at the same time, the connection valve on the branch pipe connecting to the other vacuum maintenance guarantee system is closed, so that the system returns to the normal use state, ensuring that the vacuum degree in the vacuum section of the adiabatic pipeline can be stably maintained within a range for a long time. By means of mutual backup of vacuum pumps, the operation stability of the whole system is improved, which is convenient for repairing and maintaining the local part of the system during use.

[0023] The present utility model will be further described below in conjunction with the drawings and embodiments. Description of the Drawings

[0024] Figure 1 It is the overall schematic diagram of a vacuum maintenance guarantee system described in the present utility model.

[0025] In the figure: 100, vacuum maintenance guarantee system; 101, jump connection pipe; 102, branch pipe; 1021, connection valve; 103, solenoid valve; 104, vacuum pump; 105, vacuum gauge; 106, control box; 107, vacuum meter; 108, access valve; 200, adiabatic pipeline; 201, inner pipe; 202, outer pipe; 203, cavity; 2031, vacuum section. Detailed Embodiment

[0026] The following description is used to explain the present utility model in detail so that those skilled in the art can implement the present utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present utility model.

[0027] Please refer to Figure 1, the present utility model provides a technical solution: a vacuum maintenance guarantee system. The heat-insulating pipeline 200 includes an inner pipe 201 and an outer pipe 202 sleeved outside the inner pipe 201. A cavity 203 is formed between the inner pipe 201 and the outer pipe 202, and the ends of the cavity 203 in the length direction of the heat-insulating pipeline 200 are sealed.

[0028] The cavity 203 is divided into several independent vacuum sections 2031 along the length direction of the heat-insulating pipeline 200, and each vacuum section 2031 is respectively connected to a vacuum maintenance guarantee system 100 through a jumper pipe 101.

[0029] The vacuum maintenance guarantee system 100 includes:

[0030] a solenoid valve 103 and a vacuum pump 104, and the vacuum section 2031, the solenoid valve 103 and the vacuum pump 104 are connected in sequence;

[0031] Two vacuum maintenance guarantee systems 100 are connected and communicated through a branch pipe 102. The branch pipe 102 is located between the vacuum section 2031 and the solenoid valve 103, and a connection valve 1021 is provided on the branch pipe 102.

[0032] By segmenting the design of the cavity 203 in the original heat-insulating pipeline 200, in the normal use state, the connection valve 1021 on the branch pipe 102 between different vacuum maintenance guarantee systems 100 is closed, and the solenoid valve 103 on the vacuum maintenance guarantee system 100 is opened. The vacuum pumps 104 of different vacuum maintenance guarantee systems 100 are responsible for maintaining the vacuum degree in different vacuum sections 2031;

[0033] When one of the vacuum maintenance guarantee systems 100 needs to be maintained or repaired, the solenoid valve 103 of this vacuum maintenance guarantee system 100 is closed, and at the same time, the connection valve 1021 between it and another vacuum maintenance guarantee system 100 is opened. The other vacuum maintenance guarantee system 100 communicates the two vacuum sections 2031 through the branch pipe 102 to evacuate the two vacuum sections 2031. After the vacuum maintenance guarantee system 100 is maintained or repaired, the solenoid valve 103 of this vacuum maintenance guarantee system 100 is reopened, and at the same time, the connection valve 1021 on the branch pipe 102 connecting to another vacuum maintenance guarantee system 100 is closed to make the system return to the normal use state again.

[0034] By introducing a vacuum maintenance and guarantee system 100, it is ensured that the vacuum degree of the vacuum section 2031 in the heat-insulating pipeline 200 can be stably maintained within a certain range for a long time. The operating stability of the entire system is improved by the mutual backup of vacuum pumps 104, which facilitates the repair and maintenance of local parts of the system during use. In addition, the problem of the decrease in vacuum degree after the long-term use of the heat-insulating pipeline 200 is solved. It should be noted that the cavity 203 is divided into a vacuum section 2031 according to the vacuum degree completion time.

[0035] Furthermore, the vacuum maintenance and guarantee system 100 further includes:

[0036] A vacuum gauge 105, which is connected between the vacuum section 2031 and the solenoid valve 103;

[0037] A control box 106, which is respectively connected to control the vacuum gauge 105, the solenoid valve 103 and the vacuum pump 104.

[0038] During use, by starting the power supply of the control box 106, the opening of the solenoid valve 103 in the system can be realized, and by closing the power supply of the control box 106, the closing of the solenoid valve 103 in the system can be realized. The vacuum pump 104 works under the monitoring of the control box 106 to realize the automatic control of the system.

[0039] Optionally, the control box 106 is connected to control the connection valve 1021 to realize the control of all valves in the system by the control box 106.

[0040] Furthermore, the vacuum maintenance and guarantee system 100 further includes: a vacuum meter 107, which is connected to the vacuum gauge 105. During use, the signal measured by the vacuum gauge 105 is transmitted to the vacuum meter 107, and after amplification processing, the vacuum degree of the measured vacuum environment can be displayed.

[0041] Furthermore, the connection between the vacuum maintenance and guarantee system 100 and the vacuum section 2031 is an openable and closable connection. Even further, the vacuum maintenance and guarantee system 100 further includes: an access valve 108, which is arranged between the vacuum maintenance and guarantee system 100 and the vacuum section 2031. Specifically, the access valve 108 is located between the vacuum gauge 105 and the vacuum section 2031. During use, the connection between the vacuum maintenance and guarantee system 100 and the vacuum section 2031 can be controlled by operating the corresponding manual valve.

[0042] Furthermore, both the access valve 108 and the connection valve 1021 are manually controlled.

[0043] Further, the number of the vacuum pumps 104 in the vacuum maintenance support system 100 is two, namely a main pump and a sub-pump. The main pump and the sub-pump are connected to the vacuum section 2031 in parallel, and the main pump and the sub-pump work in an alternating manner. In the normal use state, the main pump works to evacuate the vacuum section 2031. When the main pump is under maintenance, the sub-pump is started to replace the main pump to evacuate the vacuum section 2031.

[0044] Further, the inner wall of the cavity 203 is covered with a heat insulating material to further improve the heat insulation performance of the heat insulating pipeline 200. Preferably, the heat insulating material is a composite heat insulating material.

[0045] Further, the number of the heat insulating pipelines 200 is multiple, and the heat insulating pipelines 200 are connected in sequence along the length direction, and the cavities 203 of the adjacent heat insulating pipelines 200 are communicated with each other. During use, the cavities 203 in the connected heat insulating pipelines 200 form an integral body, so as to facilitate the evacuation of the whole cavity 203 by clamping the vacuum maintenance support system 100.

[0046] In summary, by using the jumper pipe 101 to connect the cavities 203 of the liquid nitrogen conveying pipelines to be connected in series, and connecting the jumper pipe 101 to the vacuum pump 104, when the vacuum maintenance support system 100 is put into use, the vacuum pump 104 can continuously evacuate the cavity 203. With the vacuum gauge 105 and the corresponding control box 106, the vacuum degree of the whole cavity 203 can be stably maintained within a range for a long time; when a single insulating pipeline is too long, the cavity 203 can be divided into two vacuum sections 2031 or multiple vacuum sections 2031 along the length direction of the heat insulating pipe for evacuation treatment respectively. Each vacuum section 2031 is equipped with a complete vacuum maintenance support system 100, and the vacuum pumps 104 between different vacuum sections 2031 are backup for each other. Usually, they are respectively responsible for the vacuum maintenance of different vacuum sections 2031. When one of the vacuum maintenance support systems 100 has a problem, the connected vacuum maintenance support system 100 of the adjacent vacuum section 2031 can temporarily replace this vacuum maintenance support system 100 to work, ensuring the long-term stable operation of the vacuum maintenance support system 100.

[0047] Working mode:

[0048] The vacuum maintenance support system 100 first uses a vacuum jump connection pipe 101 to connect to the vacuum section 2031 on the adiabatic pipe 200. The access valve 108 corresponding to it controls whether the vacuum maintenance support system 100 is accessed, and the solenoid valve 103 controls whether the vacuum pump 104 is accessed. In the system, the vacuum gauge 105, the solenoid valve 103, and the vacuum pump 104 are all controlled by the control box 106. The vacuum gauge 107 is used to monitor the working state of the vacuum maintenance support system 100 where it is located. Different vacuum maintenance support systems 100 are connected through a branch pipe 102 with a connection valve 1021;

[0049] Taking the setting of two such vacuum maintenance support systems 100 as an example, the two vacuum maintenance support systems 100 are respectively the first system and the second system. Under normal use conditions, the connection valve 1021 on the branch pipe 102 between the first system and the second system is closed, and other valves in the first system and the second system are all open. When the power of the control box 106 is started, the vacuum pump 104 works normally under the monitoring of the control box 106. Different vacuum pumps 104 are responsible for maintaining the vacuum degrees of different vacuum sections 2031;

[0050] When one of the first system and the second system needs to be maintained or repaired, taking the first system as an example here, the power of the control box 106 of the first system is turned off, the solenoid valve 103 in the first system is closed, and at the same time the connection valve 1021 of the branch pipe 102 between the first system and the second system is opened. The second system replaces the first system, and the second system evacuates the two vacuum sections 2031 at the same time. After the first system is repaired, the power of the control box 106 of the first system is turned on again, and at the same time the connection valve 1021 of the branch pipe 102 between the first system and the second system is closed. The first system returns to the normal use state again, and the first system and the second system evacuate the vacuum sections 2031 connected to them separately.

[0051] This vacuum maintenance support system 100 has the following advantages:

[0052] High reliability: The design of dynamic vacuum maintenance and mutual backup significantly improves the reliability and stability of the entire system, effectively avoiding the problem of the decrease in the vacuum degree of the vacuum layer of the static vacuum pipe after long-term use;

[0053] Convenient for maintenance and management: The entire dynamic vacuum system can be unaffected during the maintenance and repair process, ensuring the stability of liquid supply;

[0054] High cost performance: The mutual backup of the vacuum systems can reduce space occupation, save operation costs, and be cost-effective.

[0055] The embodiments described above are only used to illustrate the technical idea and features of the present utility model. The purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. The scope of the patent adoption of the present utility model cannot be limited only by these embodiments. That is, any equivalent changes or modifications made according to the spirit disclosed by the present utility model still fall within the scope of the patent of the present utility model.

Claims

1. A vacuum maintenance guarantee system, the adiabatic pipeline (200) includes an inner pipe (201) and an outer pipe (202) sleeved outside the inner pipe (201), a cavity (203) is formed between the inner pipe (201) and the outer pipe (202), and the two ends of the cavity (203) in the length direction of the adiabatic pipeline (200) are sealed. It is characterized in that, The cavity (203) is divided into a number of independent vacuum sections (2031) along the length direction of the heat-insulating pipeline (200). Each vacuum section (2031) is connected to a vacuum maintenance guarantee system (100) through a jump pipe (101). The vacuum maintenance guarantee system (100) includes: a solenoid valve (103) and a vacuum pump (104). The vacuum section (2031), the solenoid valve (103), and the vacuum pump (104) are connected in sequence. Two vacuum maintenance guarantee systems (100) are connected to each other through a branch pipe (102). The branch pipe (102) is located between the vacuum section (2031) and the solenoid valve (103), and a connection valve (1021) is provided on the branch pipe (102).

2. The vacuum maintenance guarantee system according to claim 1 above, characterized in that, It further includes: A vacuum gauge tube (105), which is connected between the vacuum section (2031) and the solenoid valve (103). A control box (106), which controls the connection of the vacuum gauge tube (105), the solenoid valve (103), and the vacuum pump (104) respectively.

3. A vacuum maintenance guarantee system according to claim 2 above, characterized in that, It further includes: A vacuum meter (107), which is connected to the vacuum gauge tube (105).

4. A vacuum maintenance guarantee system according to claim 1 above, characterized in that, It further includes: An access valve (108), which is provided between the vacuum maintenance guarantee system (100) and the vacuum section (2031).

5. A vacuum maintenance guarantee system according to claim 4 above, characterized in that, Both the access valve (108) and the connection valve (1021) are manually controlled.

6. A vacuum maintenance guarantee system according to claim 1 above, characterized in that, In the vacuum maintenance guarantee system (100), the number of vacuum pumps (104) is two, namely a main pump and a sub-pump. The main pump and the sub-pump are connected to the vacuum section (2031) in parallel, and the main pump and the sub-pump work in an alternating manner.

7. A vacuum maintenance guarantee system according to claim 1 above, characterized in that, The inner wall of the cavity (203) is covered with heat-insulating material.

8. A vacuum maintenance guarantee system according to claim 1 above, characterized in that, The number of heat-insulating pipelines (200) is multiple, and the heat-insulating pipelines (200) are connected in sequence along the length direction, and the cavities (203) of adjacent heat-insulating pipelines (200) are connected to each other.

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