Vacuumizing device for high-vacuum heat insulation storage tank

Abstract

The utility model relates to a vacuumizing device for a high-vacuum heat insulation storage tank. Comprising a vacuum heat insulation storage tank and a vacuum jacket arranged outside the vacuum heat insulation storage tank, and further comprises a graded vacuumizing unit connected with a vacuumizing opening of the vacuum jacket and a vacuum instrument detection unit used for monitoring the vacuum degree to achieve graded starting of the graded vacuumizing unit. The graded vacuumizing unit at least comprises a first-stage vacuumizing part and a second-stage vacuumizing part; the device has the characteristics that the structure is simple, the adaptive capacity of the pressure difference working condition interval is improved, and the vacuumizing speed and efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature liquid storage, in particular to a vacuum pumping device for a high vacuum insulation storage tank. Background Art

[0002] Vacuum insulated storage tanks are pressure vessels used to store cryogenic liquids such as liquid oxygen, liquid carbon dioxide, and liquefied natural gas. Such containers generally need to withstand a temperature difference of more than 100°C. If the insulation performance of the container is not up to standard, the cryogenic liquid will evaporate excessively after being heated, which will cause waste at best and may even cause danger due to increased internal pressure. In order to meet the extremely high requirements for insulation performance of cryogenic storage tanks, vacuum is an absolutely indispensable and important means.

[0003] At present, the establishment of the vacuum system of the vacuum insulated storage tank jacket is mainly achieved by the traditional vacuum pump. The traditional vacuum pump has the characteristics of large vacuum extraction volume and stable running speed, but at the same time, it has the defects of poor adaptability to large pressure difference working range, high inlet pressure and fast pumping speed, low inlet pressure and slow pumping speed, low efficiency and narrow vacuum range. 3 For a liquid carbon dioxide storage tank, when its jacket is evacuated from normal atmospheric pressure to below 2.5Pa, the traditional vacuum pump has a pumping rate of 30L / s. For example, it takes about 40 minutes to evacuate from normal atmospheric pressure to 10Pa, and about 10h20min to evacuate from 10Pa to below 2.5Pa. That is, it takes about 11h to evacuate the jacket from normal atmospheric pressure to below 2.5Pa using the traditional method. Utility Model Content

[0004] In order to make up for the above deficiencies, the utility model provides a vacuum pumping device for a high vacuum insulated storage tank, aiming to solve the problems of slow pumping speed and low vacuum pumping efficiency.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A vacuum pumping device for a high vacuum insulated storage tank comprises a vacuum insulated storage tank and a vacuum jacket arranged outside the vacuum insulated storage tank, the vacuum pumping device comprises a graded vacuum pumping unit connected to a vacuum pumping port of the vacuum jacket, and a vacuum instrument detection unit for monitoring the vacuum degree to realize graded start-up of the graded vacuum pumping unit; the graded vacuum pumping unit comprises at least a primary vacuum pumping part and a secondary vacuum pumping part.

[0007] The beneficial effects of the utility model are as follows: by setting up a vacuum instrument detection unit, the vacuum degree in the vacuum jacket can be monitored in real time. Through this detection, not only the air pressure condition in the vacuum jacket can be understood, but also data support is provided for the start-up of the first-level vacuum pumping part and the second-level vacuum pumping part in the graded vacuum pumping unit, so as to achieve the characteristics of improving the adaptability of the pressure difference working condition range and the vacuum extraction rate, so as to realize the characteristics of improving efficiency under the premise of rapid vacuum pumping.

[0008] Preferably, the first-stage vacuum pumping part and the second-stage vacuum pumping part are arranged in parallel or in series. When they are arranged in parallel, corresponding valves are respectively provided at the front of the first-stage vacuum pumping part and the second-stage vacuum pumping part; when they are arranged in series, a valve is provided at the front of the first-stage vacuum pumping part.

[0009] Preferably, the vacuum instrument detection unit includes at least a first pressure gauge arranged on the vacuum jacket.

[0010] Preferably, when the first-level vacuum pumping part and the second-level vacuum pumping part are arranged in parallel, a second pressure gauge is provided in front of the corresponding valve of the first-level vacuum pumping part, and a third pressure gauge is provided in front of the corresponding valve of the second-level vacuum pumping part.

[0011] Preferably, when the first-level vacuum pumping part and the second-level vacuum pumping part are arranged in series, a second pressure gauge is provided between the first-level vacuum pumping part and the valve, and a third pressure gauge is provided between the first-level vacuum pumping part and the second-level vacuum pumping part.

[0012] Preferably, the first-stage vacuum pumping part is a rotary vane vacuum pump for reducing the air pressure inside the vacuum jacket from standard atmospheric pressure to 10Pa; the second-stage vacuum pumping part is a variable frequency molecular pump for reducing the air pressure inside the vacuum jacket from 10Pa to 0.001Pa.

[0013] Preferably, the utility model also includes an integrated control system, the signal input end of the integrated control system is connected to the first pressure gauge, the second pressure gauge and the third pressure gauge; the signal output end of the integrated control system is respectively connected to the rotary vane vacuum pump and the vacuum integrated joint control system, and the output end of the vacuum integrated joint control system is connected to the variable frequency molecular pump.

[0014] Preferably, the signal output end of the integrated control system is also connected to a valve.

[0015] Preferably, a quick connector is further provided between the vacuum jacket vacuum port and the graded vacuum unit, and the quick connector includes a connecting pipe and vacuum quick connectors provided at both ends of the connecting pipe.

[0016] A vacuum pumping device for a high vacuum insulated storage tank manufactured according to the above scheme can monitor the vacuum degree in the vacuum jacket in real time by setting a vacuum instrument detection unit. Through this detection, not only the air pressure condition in the vacuum jacket can be understood, but also data support is provided for the start-up of the first-level vacuum pumping part and the second-level vacuum pumping part in the graded vacuum pumping unit, so as to improve the adaptability to the pressure difference working condition range and the rate of vacuum extraction; further, the air pressure in the vacuum jacket can be detected by setting a first pressure gauge, the air pressure in the front of the first-level vacuum pumping part can be accurately detected by setting a second pressure gauge, and the air pressure in the front of the second-level vacuum pumping part can be accurately detected by setting a third pressure gauge, so as to accurately meet the pressure difference working condition range adapted to the first-level vacuum pumping part and the second-level vacuum pumping part, creating conditions for further improving the rate of vacuum extraction and improving efficiency; further, by setting a quick connector, the vacuum jacket and the graded vacuum pumping unit can be quickly installed and disassembled; it has the characteristics of simple structure, improved adaptability to the pressure difference working condition range, and improved rate and efficiency of vacuum extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model when connected in series;

[0018] Figure 2 It is a schematic diagram of the structure of the utility model when connected in parallel;

[0019] Figure 3 This is the control principle diagram of the utility model;

[0020] Figure 4 This is another control principle diagram of the utility model.

[0021] Legend:

[0022] 1. Vacuum insulated storage tank; 2. Vacuum jacket; 3. Valve; 4. First pressure gauge; 5. Second pressure gauge; 6. Third pressure gauge; 7. Rotary vane vacuum pump; 8. Variable frequency molecular pump; 9. Integrated control system; 10. Vacuum integrated joint control system; 11. Vacuum quick connector; 12. Connecting pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Reference Figure 1-Figure 2The utility model provides a vacuum pumping device for a high vacuum insulated storage tank, comprising a vacuum insulated storage tank 1 and a vacuum jacket 2 arranged outside the vacuum insulated storage tank 1, the vacuum pumping device comprising a graded vacuum pumping unit connected to the vacuum pumping port of the vacuum jacket 2, and a vacuum instrument detection unit for monitoring the vacuum degree to realize the graded start of the graded vacuum pumping unit; the graded vacuum pumping unit at least comprises a primary vacuum pumping part and a secondary vacuum pumping part. The utility model is mainly used for vacuum pumping of the vacuum jacket 2 of the high vacuum insulated storage tank. The pressure in the traditional vacuum jacket 2 is less than or equal to 3Pa, but the vacuum degree inside the jacket affects the insulation effect of the storage tank and the associated system operation consumption; therefore, the traditional vacuum pump can only reduce the gas phase in the vacuum jacket 2 to about 1Pa by extracting vacuum for a long time; and the utility model sets a primary vacuum pumping part and a secondary vacuum pumping part to realize starting different vacuum pumping parts in different pressure difference working conditions, thereby achieving the vacuum extraction rate, so that the gas pressure in the vacuum jacket 2 is maintained at a high vacuum operation of 0.01Pa.

[0025] Further, the first-stage vacuum pumping part and the second-stage vacuum pumping part are arranged in parallel or in series. When they are arranged in parallel, the front parts of the first-stage vacuum pumping part and the second-stage vacuum pumping part are respectively provided with corresponding valves 3; when they are arranged in series, the front parts of the first-stage vacuum pumping part are respectively provided with valves 3. The first-stage vacuum pumping part and the second-stage vacuum pumping part described in the utility model can be arranged in parallel or in series. When they are arranged in parallel, the corresponding valve 3 is opened to coordinate with the opening of the vacuum pumping part. When they are in series and vacuuming, the valve 3 is always in an open state, and the first-stage vacuum pumping part is running in the early stage. When the second-stage vacuum pumping part is opened, the first-stage vacuum pumping part stops running and serves as a passage between the vacuum jacket 2 and the second-stage vacuum pumping part.

[0026] Furthermore, the vacuum instrument detection unit includes at least a first pressure gauge 4 provided in the vacuum jacket 2. The first pressure gauge 4 can monitor the air pressure in the vacuum jacket 2 in real time, and at the same time provide data support for the opening timing of the primary vacuum pumping part and the secondary vacuum pumping part.

[0027] Furthermore, when the first-level vacuum pumping part and the second-level vacuum pumping part are arranged in parallel, a second pressure gauge 5 is provided in front of the valve 3 corresponding to the first-level vacuum pumping part, and a third pressure gauge 6 is provided in front of the valve 3 corresponding to the second-level vacuum pumping part. The purpose of setting the second pressure gauge 5 and the third pressure gauge 6 in the utility model is to realize accurate monitoring of the air pressure, especially when the first-level vacuum pumping part and the second-level vacuum pumping part are opened, the corresponding air pressure is accurately monitored to achieve the characteristics of improving work efficiency and reducing energy consumption; specifically, the second pressure gauge 5 is used to detect the air pressure condition in the front area of ​​the first-level vacuum pumping part to provide a basis for the timing of stopping the operation of the first-level vacuum pumping part; the third pressure gauge 6 is used to detect the air pressure condition in the front area of ​​the second-level vacuum pumping part to provide a basis for the operation, switching frequency and timing of stopping the operation of the second-level vacuum pumping part.

[0028] Furthermore, when the first-level vacuum pumping part and the second-level vacuum pumping part are arranged in series, a second pressure gauge 5 is provided between the first-level vacuum pumping part and the valve 3, and a third pressure gauge 6 is provided between the first-level vacuum pumping part and the second-level vacuum pumping part.

[0029] Furthermore, the first-stage vacuum pumping part is a rotary vane vacuum pump 7 for reducing the air pressure inside the vacuum jacket 2 from the standard atmospheric pressure to 10Pa; the second-stage vacuum pumping part is a variable frequency molecular pump 8 for reducing the air pressure inside the vacuum jacket 2 from 10Pa to 0.001Pa.

[0030] Reference Figure 1-Figure 3 The utility model further includes an integrated control system 9, the signal input end of the integrated control system 9 is connected to the first pressure gauge 4, the second pressure gauge 5 and the third pressure gauge 6; the signal output end of the integrated control system 9 is respectively connected to the rotary vane vacuum pump 7 and the vacuum integrated joint control system 10, and the output end of the vacuum integrated joint control system 10 is connected to the variable frequency molecular pump 8. The utility model can adopt the form of manual control or automatic control, and according to the data detected in the first pressure gauge 4, the second pressure gauge 5 and the third pressure gauge 6, the corresponding vacuum pumping part is opened.

[0031] Further, refer to Figure 4 The signal output end of the integrated control system 9 is also connected to the valve 3.

[0032] Furthermore, a quick connector is provided between the vacuum outlet of the vacuum jacket 2 and the graded vacuum unit, and the quick connector includes a connecting pipe 12 and vacuum quick connectors 11 provided at both ends of the connecting pipe 12. The utility model is also provided with a quick connector to realize the rapid establishment of a vacuum system between the vacuum outlet of the vacuum jacket 2 and the graded vacuum unit, so as to create conditions for the subsequent combination of vacuum equipment in different forms, realize stage control between the graded intervals, improve work efficiency, establish high vacuum and reduce consumption.

[0033] The working principle of the utility model is as follows: a vacuum system is established between the vacuum jacket 2 outside the vacuum insulated storage tank 1 and the graded vacuum unit through a quick connector. Specifically, one end of the connecting pipe 12 is connected to the vacuum port of the vacuum jacket 2, and the other end is connected to the graded vacuum unit. After the above connection is completed, the vacuum process begins. The integrated control system 9 controls the valve 3 in front of the rotary vane vacuum pump 7 to open, and controls the rotary vane vacuum pump 7 to start, and performs a vacuum operation on the vacuum jacket 2. The pressure detected by the first pressure gauge 4 is in the range of normal atmospheric pressure to 10Pa, and the rotary vane vacuum pump 7 continues to operate; when When the air pressure displayed by the second pressure gauge 5 is less than 10Pa, the rotary vane vacuum pump 7 stops running, and at the same time, the vacuum integrated joint control system 10 is controlled by the integrated control system 9. The vacuum integrated joint control system 10 controls the variable frequency molecular pump 8 to run at a low speed. The air pressure range of the variable frequency molecular pump 8 running at a low speed is 10Pa-0.1Pa, that is, when the air pressure value detected by the third pressure gauge 6 is within the threshold range of 10Pa-0.1Pa, the variable frequency molecular pump 8 is always in a low-speed running state; when the air pressure value detected by the third pressure gauge 6 is less than 0.1Pa, the air pressure data is fed back to the integrated control system 9, and the integrated control system 9 is The vacuum integrated joint control system 10 controls the variable frequency molecular pump 8 to run at high speed, and the air pressure range of the variable frequency molecular pump 8 running at low speed is 0.1Pa~0.001Pa, that is, when the air pressure value detected by the third pressure gauge 6 is within the threshold range of 0.1Pa~0.001Pa, the variable frequency molecular pump 8 is always in a high-speed running state, and when the air pressure value detected by the third pressure gauge 6 is equal to or less than 0.001Pa, the integrated control system 9 controls the variable frequency molecular pump 8 to stop running through the vacuum integrated joint control system 10; the utility model can effectively improve the vacuum degree of the vacuum insulated storage tank 1 and reduce convective heat transfer. ; By adopting the vacuum graded establishment technology, a variety of vacuum extraction methods are combined. In the early stage of vacuuming, a large-flow low-vacuum unit is used for operation. When the vacuum reaches a certain level, the high-vacuum unit is started to run at a low speed, and the system vacuum is improved. When the vacuum system is raised to a certain height, the system automatically adjusts, and the high-vacuum unit runs at a high speed to establish a high vacuum. The vacuum graded start-up control method is added, and each pump system operates in the high-efficiency area to reduce energy consumption. During the vacuum establishment process, the system detects and handles any leaks to reduce leakage, and finally maintains a high vacuum of 0.01Pa in the vacuum insulated storage tank jacket, reducing the energy loss of the system operation.

[0034] Test example: With a volume of 50m 3Take the liquid carbon dioxide storage tank as an example; the vacuum device using traditional technology: the traditional vacuum motor has a pumping rate of 30L / s, a motor power of 3000W, and it takes about 40 minutes to vacuum from normal atmospheric pressure to 10Pa, with a power consumption of about 2000W; from 10Pa to below 2.5Pa, it takes about 10h20min, with a power consumption of about 31000W, a total time of about 11h, and a total power consumption of about 33000W. Using the technical solution of the utility model, the pumping rate of the rotary vane vacuum pump 7 is 3L / s, the motor power is 550W, and it takes about 3h to vacuum from normal atmospheric pressure to 10Pa; the motor power of the variable frequency molecular pump 8 is 600W, and the total power of the device is 1200W; from 10Pa to below 2.5Pa, it takes about 7h, with a power consumption of about 8400W (all parts of the device are working), a total time of about 10h, and a total power consumption of about 10200W. From the above content, it can be known that the use of the utility model can achieve the characteristic of significantly reducing energy consumption while saving 1 hour during vacuuming.

[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum pumping device for a high vacuum insulated storage tank, comprising a vacuum insulated storage tank (1) and a vacuum jacket (2) arranged outside the vacuum insulated storage tank (1), characterized in that: The vacuum pumping device comprises a staged vacuum pumping unit connected to a vacuum pumping port of a vacuum jacket (2), and a vacuum instrument detection unit for monitoring the vacuum degree to realize staged activation of the staged vacuum pumping unit; The graded vacuum pumping unit at least comprises a primary vacuum pumping part and a secondary vacuum pumping part.

2. A vacuum pumping device for a high vacuum insulated storage tank according to claim 1, characterized in that: The first-stage vacuum pumping part and the second-stage vacuum pumping part are arranged in parallel or in series. When they are arranged in parallel, corresponding valves (3) are respectively provided at the front of the first vacuum pumping part and the second vacuum pumping part; When the arrangement is in series, a valve (3) is provided in front of the first-stage vacuum pumping section.

3. A vacuum pumping device for a high vacuum insulated storage tank according to claim 2, characterized in that: The vacuum instrument detection unit comprises a first pressure gauge (4) at least arranged on the vacuum jacket (2).

4. A vacuum pumping device for a high vacuum insulated storage tank according to claim 3, characterized in that: When the first-stage vacuum pumping part and the second-stage vacuum pumping part are arranged in parallel, a second pressure gauge (5) is provided in front of the valve (3) corresponding to the first-stage vacuum pumping part, and a third pressure gauge (6) is provided in front of the valve (3) corresponding to the second-stage vacuum pumping part.

5. The vacuum pumping device for a high vacuum insulated storage tank according to claim 3, characterized in that: When the first-stage vacuum pumping part and the second-stage vacuum pumping part are arranged in series, a second pressure gauge (5) is provided between the first-stage vacuum pumping part and the valve (3), and a third pressure gauge (6) is provided between the first-stage vacuum pumping part and the second-stage vacuum pumping part.

6. The vacuum pumping device for a high vacuum insulated storage tank according to claim 2, characterized in that: The first-stage vacuum pumping part is a rotary vane vacuum pump (7) used to reduce the air pressure inside the vacuum jacket (2) from the standard atmospheric pressure to 10 Pa; the second-stage vacuum pumping part is a variable frequency molecular pump (8) used to reduce the air pressure inside the vacuum jacket (2) from 10 Pa to 0.001 Pa.

7. The vacuum pumping device for a high vacuum insulated storage tank according to claim 1, characterized in that: It also includes an integrated control system (9), wherein a signal input end of the integrated control system (9) is connected to a first pressure gauge (4), a second pressure gauge (5) and a third pressure gauge (6); a signal output end of the integrated control system (9) is respectively connected to a rotary vane vacuum pump (7) and a vacuum integrated combined control system (10), and an output end of the vacuum integrated combined control system (10) is connected to a variable frequency molecular pump (8).

8. The vacuum pumping device for a high vacuum insulated storage tank according to claim 7, characterized in that: The signal output end of the integrated control system (9) is also connected to the valve (3).

9. The vacuum pumping device for a high vacuum insulated storage tank according to claim 1, characterized in that: A quick connector is also provided between the vacuum outlet of the vacuum jacket (2) and the graded vacuum unit, and the quick connector comprises a connecting pipe (12) and vacuum quick connectors (11) provided at both ends of the connecting pipe (12).

Images