Pressure vessel circulation test device

Abstract

The utility model provides a cyclic test device for a pressure vessel. The cyclic test device comprises a high-pressure gas storage cylinder group, a medium-pressure gas storage cylinder, a low-pressure gas storage cylinder and a control device, the high-pressure gas storage cylinder group is communicated with the pressure container, the medium-pressure gas storage cylinder is communicated with the pressure container and the high-pressure gas storage cylinder group, and the low-pressure gas storage cylinder is communicated with the pressure container and the medium And the pressure container can discharge experimental gas to the medium-pressure gas storage bottle and the low-pressure gas storage bottle. Moreover, when the pressure in the low-pressure gas storage cylinder is higher than a first pressure value, the control device controls the low-pressure gas storage cylinder to transfer the experimental gas to the medium-pressure gas storage cylinder. Meanwhile, when the gas pressure of the high-pressure gas storage cylinder group is lower than a second pressure value, the control device can control the medium-pressure gas storage cylinder to fill the high-pressure gas storage cylinder group with the experimental gas until the gas pressure in the high-pressure gas storage cylinder group reaches or is higher than the second pressure value, so that the experimental gas is recycled; therefore, the high-pressure gas storage bottle group can continuously fill the experimental gas into the pressure container, and recycling of the experimental gas is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure vessel manufacturing, and particularly relates to a pressure vessel circulation test device. Background Art

[0002] In the field of pressure vessels, after high-pressure vessels or high-pressure gas cylinders are manufactured, strength tests and airtightness tests need to be carried out according to the specification requirements. In newly designed products, type tests also need to be carried out. The type test of a high-pressure vessel or a high-pressure gas cylinder refers to the type test carried out on the newly developed product after the product design is completed, which is to verify whether the product can meet the technical requirements such as the filling times under the working pressure required by the technical specification.

[0003] Currently, the method of conducting type tests in China is usually to use a compressor to pressurize the test object to the design pressure, keep the pressure for a certain period of time, and then read the relevant values to obtain the corresponding experimental data.

[0004] However, after the test is completed, when the test object is depressurized, the test gas will be directly discharged into the atmosphere. After multiple tests, such as when conducting type tests, thousands of filling and discharging cycle tests are required, so a large amount of test gas is consumed during the entire test process, resulting in waste of the test gas and causing air pollution. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pressure vessel circulation test device that can recycle the test gas.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] According to one aspect of the present utility model, the present utility model provides a pressure vessel circulation test device for performing strength tests, airtightness tests, and type tests on a pressure vessel to be tested. The pressure vessel circulation test device includes: a high-pressure gas cylinder group, which is connected to the pressure vessel to fill the pressure vessel with test gas so that the pressure inside the pressure vessel reaches the test pressure value; a medium-pressure gas cylinder, which is connected between the high-pressure gas cylinder group and the pressure vessel to recover the test gas inside the pressure vessel and can fill the test gas inside the medium-pressure gas cylinder into the high-pressure gas cylinder group; a low-pressure gas cylinder, which is connected between the pressure vessel and the medium-pressure gas cylinder to recover the test gas inside the pressure vessel and can fill the test gas inside the low-pressure gas cylinder into the medium-pressure gas cylinder; a control device, which is connected to the high-pressure gas cylinder group, the pressure vessel, the medium-pressure gas cylinder, and the low-pressure gas cylinder; wherein, when the pressure value inside the low-pressure gas cylinder is higher than the first pressure value, the control device can control the low-pressure gas cylinder to fill the test gas into the medium-pressure gas cylinder; when the pressure inside the high-pressure gas cylinder group is lower than the second pressure value, the control device can control the medium-pressure gas cylinder to fill the test gas into the high-pressure gas cylinder group.

[0008] In an embodiment of the present application, the pressure vessel circulation test device further includes a first-stage compressor and a second-stage compressor; both the first-stage compressor and the second-stage compressor are connected to the control device; wherein, when the pressure inside the low-pressure gas cylinder is higher than the first pressure value, the control device can control the first-stage compressor to operate to fill the test gas of the low-pressure gas cylinder into the medium-pressure gas cylinder; when the pressure inside the high-pressure gas cylinder group is lower than the second pressure value, the control device can control the second-stage compressor to operate to fill the test gas inside the medium-pressure gas cylinder into the high-pressure gas cylinder group.

[0009] In an embodiment of the present application, the high-pressure gas cylinder group includes a plurality of high-pressure gas cylinders; all the plurality of high-pressure gas cylinders can be connected to the pressure vessel so that the high-pressure gas cylinders can fill the pressure vessel with test gas; the plurality of high-pressure gas cylinders can fill the test gas into the pressure vessel by means of differential pressure filling to improve the gas utilization rate and filling efficiency inside the high-pressure gas cylinder group.

[0010] In an embodiment of the present application, the pressure vessel circulation test device further includes a plurality of heating elements; the plurality of heating elements are respectively arranged at the air outlets of the high-pressure gas cylinder group, the pressure vessel, the medium-pressure gas cylinder, and the low-pressure gas cylinder to heat the pipelines at the air outlets.

[0011] In an embodiment of the present application, the pressure vessel circulation test device further includes a reheater; the reheater is arranged downstream of the air outlet direction of the pressure vessel and upstream of the medium-pressure gas storage cylinder and the low-pressure gas storage cylinder, so as to heat the experimental gas flowing out of the pressure vessel.

[0012] In an embodiment of the present application, the pressure vessel circulation test device further includes a drying assembly; the drying assembly is arranged at the air inlet of the low-pressure gas storage cylinder to absorb moisture in the test gas.

[0013] In an embodiment of the present application, the pressure vessel circulation test device further includes a flowmeter; the flowmeter is arranged between the high-pressure gas storage cylinder group and the pressure vessel to read the flow rate of the experimental gas between the high-pressure gas storage cylinder group and the pressure vessel.

[0014] In an embodiment of the present application, the control device includes an automatic valve, a pressure transmitter, and a temperature transmitter; the automatic valve is arranged on the connecting pipeline to control the on-off of the connecting pipeline; the pressure transmitter and the temperature transmitter are arranged on the connecting pipeline, the high-pressure gas storage cylinder group, the pressure vessel, the medium-pressure gas storage cylinder, and the low-pressure gas storage cylinder to read the air pressure data and temperature data respectively.

[0015] In an embodiment of the present application, the control device further includes a control module; the control module is electrically connected to the automatic valve, the pressure transmitter, and the temperature transmitter to control the on-off of the automatic valve through the data fed back by the pressure transmitter and the temperature transmitter.

[0016] In an embodiment of the present application, the pressure vessel circulation test device further includes a gas discharging device; the gas discharging device is connected between an external gas source and the second-stage compressor, so that the gas discharging device can fill the high-pressure gas storage cylinder group with external experimental gas through the second-stage compressor.

[0017] From the above technical solutions, it can be seen that the present utility model has at least the following advantages and positive effects:

[0018] In the present utility model, a pressure vessel circulation test device includes a high-pressure gas storage cylinder group, a medium-pressure gas storage cylinder, a low-pressure gas storage cylinder, and a control device. Among them, the high-pressure gas storage cylinder group is connected to the pressure vessel to fill the pressure vessel with test gas. The medium-pressure gas storage cylinder is connected to the pressure vessel and the high-pressure gas storage cylinder group. The low-pressure gas storage cylinder is connected to the pressure vessel and the medium-pressure gas storage cylinder. The control device is connected to the pressure vessel, the high-pressure gas storage cylinder group, the medium-pressure gas storage cylinder, and the low-pressure gas storage cylinder to control the flow of the test gas in the pressure vessel to the medium-pressure gas storage cylinder and the low-pressure gas storage cylinder. The pressure vessel can discharge the test gas to the medium-pressure gas storage cylinder and the low-pressure gas storage cylinder. And when the pressure in the low-pressure gas storage cylinder is higher than the first pressure value, the control device controls the low-pressure gas storage cylinder to transfer the test gas to the medium-pressure gas storage cylinder. At the same time, when the air pressure of the high-pressure gas storage cylinder group is lower than the second pressure value, the control device can control the medium-pressure gas storage cylinder to fill the high-pressure gas storage cylinder group with test gas until the air pressure in the high-pressure gas storage cylinder group reaches or is higher than the second pressure value, thereby completing the recovery of the test gas, enabling the high-pressure gas storage cylinder group to continue to fill the pressure vessel with test gas, and realizing the recycling of the test gas. Description of the Drawings

[0019] Figure 1 is a schematic diagram of the pressure vessel circulation test device according to an embodiment of the present utility model.

[0020] The descriptions of the reference numerals are as follows:

[0021] 10 - Pressure vessel; 20 - High-pressure gas storage cylinder group; 21 - High-pressure gas storage cylinder; 31 - Medium-pressure gas storage cylinder; 32 - Low-pressure gas storage cylinder; 40 - Control device; 41 - Automatic valve; 42 - Pressure transmitter; 43 - Temperature transmitter; 44 - Control module; 51 - First-stage compressor; 52 - Second-stage compressor; 60 - Heating element; 61 - Reheater; 62 - Drying component; 63 - Flowmeter; 70 - Gas discharge device; 71 - External gas source. Detailed Embodiments

[0022] Typical embodiments embodying the features and advantages of the present utility model will be described in detail in the following description. It should be understood that the present utility model can have various changes in different embodiments, all of which do not depart from the scope of the present utility model, and the descriptions and illustrations therein are for illustrative purposes in nature and not for limiting the present utility model.

[0023] In the description of the present utility model, it should be understood that in the embodiments shown in the drawings, the indication of the direction or position relationship (such as up, down, left, right, front, and back, etc.) is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. When these elements are in the positions shown in the drawings, these descriptions are appropriate. If the description of the positions of these elements changes, then the indication of these directions also changes accordingly.

[0024] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0025] Currently, the way to conduct type tests in China is usually to use a compressor to pressurize the test object to the design pressure, keep the pressure for a certain period of time, and then read the relevant values to obtain the corresponding experimental data. However, after the test is completed, when the test object is depressurized, the test gas will be directly discharged into the atmosphere. After conducting multiple tests, such as when conducting type tests, thousands of charging and discharging cycle tests are required, thus consuming a large amount of test gas during the entire test process, resulting in waste and causing air pollution. Therefore, a pressure vessel cyclic test device is proposed to solve the above problems.

[0026] The solution is further illustrated by the following embodiments:

[0027] Figure 1 It is a schematic diagram of the pressure vessel cyclic test device of the embodiment of the present utility model.

[0028] Please refer to Figure 1 , the pressure vessel cyclic test device of this embodiment can be used to conduct strength tests and airtightness tests on the pressure vessel 10 to be tested to detect whether the completed pressure vessel 10 meets the technical specifications. In addition, the pressure vessel cyclic test device can also be used to conduct type tests on the pressure vessel 10 to detect whether the newly designed pressure vessel meets the technical specifications of the number of charging times. Specifically, the pressure vessel cyclic test device conducts multiple charging and discharging cycle tests on the pressure vessel (generally thousands of charging and discharging are required for type tests) to detect whether the sealing performance, structural strength, and material performance of the pressure vessel meet the requirements.

[0029] It should be noted that the pressure vessel 10 can be set as a storage tank for storing liquids, or can be set as a high-pressure gas cylinder or high-pressure storage tank for storing gases.

[0030] Refer to Figure 1 , the pressure vessel cyclic test device can include a high-pressure gas cylinder group 20, a medium-pressure gas cylinder 31, a low-pressure gas cylinder 32, and a control device 40.

[0031] Among them, the high-pressure gas storage cylinder group 20 is connected to the pressure vessel 10 and the medium-pressure gas storage cylinder 31, the low-pressure gas storage cylinder 32 is connected to the pressure vessel 10 and the medium-pressure gas storage cylinder 31, and the medium-pressure gas storage cylinder 31 is also connected to the pressure vessel 10, so that the medium-pressure gas storage cylinder 31 and the low-pressure gas storage cylinder 32 can recover the experimental gas in the pressure vessel 10. And under the control of the control device 40, the experimental gas in the medium-pressure gas storage cylinder 31 and the low-pressure gas storage cylinder 32 can be recovered into the high-pressure gas storage cylinder group 20 to realize the recycling of the experimental gas.

[0032] It should be noted that the experimental gas can be set as a Joule gas, such as nitrogen, natural gas, etc.

[0033] In this embodiment, when the pressure value in the low-pressure gas storage cylinder 32 is higher than the first pressure value, the control device 40 can control the low-pressure gas storage cylinder 32 to fill the medium-pressure gas storage cylinder 31 with the experimental gas. Until the pressure in the low-pressure gas storage cylinder 32 is lower than the first pressure value, the control device 40 can control the low-pressure gas storage cylinder 32 to stop filling the medium-pressure gas storage cylinder 31 with the experimental gas. After the low-pressure gas storage cylinder 32 fills the medium-pressure gas storage cylinder 31 with the experimental gas, it can ensure that the pressure value in the low-pressure gas storage cylinder 32 is in a state less than the first pressure value. Furthermore, when the pressure vessel 10 is depressurized, the pressure vessel 10 can transfer the experimental gas to the low-pressure gas storage cylinder 32 and the medium-pressure gas storage cylinder 31 in the way of mispressure relief, so that the pressure value in the pressure vessel 10 is reduced to a state less than the first pressure value, so that the pressure vessel 10 meets the pressure relief to the pressure relief value specified by the specification, and then the next filling and pressure relief test is carried out.

[0034] When the pressure in the high-pressure gas storage cylinder group 20 is lower than the second pressure value, the control device 40 can control the medium-pressure gas storage cylinder 31 to fill the high-pressure gas storage cylinder group 20 with the experimental gas until the pressure in the high-pressure gas storage cylinder group 20 is equal to or higher than the second pressure value, so that the pressure in the high-pressure gas storage cylinder group 20 is filled to the full-load pressure value.

[0035] It should be noted that since the experimental gas in the medium-pressure gas storage cylinder 31 and the low-pressure gas storage cylinder 32 is recovered from the experimental gas in the pressure vessel 10, when the experimental gas in the medium-pressure gas storage cylinder 31 and the low-pressure gas storage cylinder 32 is filled into the high-pressure gas storage cylinder group 20 through the control device 40, the experimental gas can be recovered into the high-pressure gas storage cylinder group 20, so that the experimental gas can be recycled and the loss of the experimental gas during the experiment can be reduced.

[0036] Refer to Figure 1, the high-pressure gas storage cylinder group 20 can be used to store experimental gases and can serve as a gas source. The high-pressure gas storage cylinder group 20 is connected to the pressure vessel 10 and is used to fill the pressure vessel 10 with experimental gases so that the air pressure inside the pressure vessel 10 reaches the test pressure value. Among them, the test pressure value can be selected according to the model of the pressure vessel 10 so that the pressure of the experimental gas inside the pressure vessel 10 meets the test conditions.

[0037] Refer to Figure 1 , the high-pressure gas storage cylinder group 20 can include multiple high-pressure gas storage cylinders 21. The multiple high-pressure gas storage cylinders 21 are respectively connected to the pressure vessel 10 so that the high-pressure gas storage cylinders 21 can individually fill the pressure vessel 10 with experimental gases. At the same time, the multiple high-pressure gas storage cylinders 21 are respectively connected to the medium-pressure gas storage cylinder 31 so that the medium-pressure gas storage cylinder 31 can respectively fill the high-pressure gas storage cylinders 21 with experimental gases.

[0038] It should be noted that the multiple high-pressure gas storage cylinders 21 can fill the pressure vessel 10 with test gases by means of misaligned pressure filling to improve the utilization rate of the experimental gases in the high-pressure gas storage cylinders 21. That is, when the multiple high-pressure gas storage cylinders 21 are all in a high-pressure state or a full-load state, first use one high-pressure gas storage cylinder 21 to fill the pressure vessel 10 with experimental gases. When the pressure difference between the air pressure in the high-pressure gas storage cylinder 21 and the air pressure in the pressure vessel 10 is lower than the set value, use another high-pressure gas storage cylinder 21 to fill the pressure vessel 10 with experimental gases to improve the filling efficiency and the utilization efficiency of the experimental gases.

[0039] In this embodiment, the high-pressure gas storage cylinder group 20 is provided with two high-pressure gas storage cylinders 21 for filling the pressure vessel 10 with experimental gases.

[0040] The low-pressure gas storage cylinder 32 is connected to the pressure vessel 10 and is used to recover the experimental gases inside the pressure vessel 10. That is, after the pressure vessel 10 completes the test, the medium-pressure gas storage cylinder 31 can recover the experimental gases inside the pressure vessel 10. The low-pressure gas storage cylinder 32 is also connected to the medium-pressure gas storage cylinder 31 to fill the experimental gases in the low-pressure gas storage cylinder 32 into the medium-pressure gas storage cylinder 31.

[0041] In this embodiment, the experimental gases inside the pressure vessel 10 are all transferred to the medium-pressure gas storage cylinder 31 and the low-pressure gas storage cylinder 32 by means of misaligned pressure release. And after completing one experiment, the pressure vessel 10 preferentially fills the medium-pressure gas storage cylinder 31 with experimental gases, and when the pressure difference between the air pressure in the pressure vessel 10 and the air pressure in the medium-pressure gas storage cylinder 31 is less than the set difference, the pressure vessel 10 only fills the low-pressure gas storage cylinder 32 with experimental gases so that the air pressure inside the pressure vessel 10 reaches the pressure relief value specified by the specification.

[0042] It should be noted that the capacities of the high-pressure gas storage cylinder group 20, the medium-pressure gas storage cylinder 31, and the low-pressure gas storage cylinder 32 are all greater than the capacity of the pressure vessel 10, so that after one filling of the external gas source, the high-pressure gas storage cylinder group 20 can fill and test the pressure vessel 10 multiple times, and the medium-pressure gas storage cylinder 31 and the low-pressure gas storage cylinder 32 can also recover the experimental gas in the pressure vessel 10 multiple times for pressure recovery, so as to avoid frequent startup of the compression mechanism in the device, thereby prolonging the service life of the compression mechanism.

[0043] The medium-pressure gas storage cylinder 31 is connected to the pressure vessel 10 and is used to recover the experimental gas in the pressure vessel 10, that is, after the pressure vessel 10 completes the test, the medium-pressure gas storage cylinder 31 can recover the experimental gas in the pressure vessel 10. The medium-pressure gas storage cylinder 31 is also connected to the high-pressure gas storage cylinder group 20 to fill the experimental gas in the medium-pressure gas storage cylinder 31 into the high-pressure gas storage cylinder group 20.

[0044] The control device 40 is connected to the high-pressure gas storage cylinder group 20, the pressure vessel 10, the medium-pressure gas storage cylinder 31, and the low-pressure gas storage cylinder 32 to control the connection or disconnection between the high-pressure gas storage cylinder group 20, the pressure vessel 10, the medium-pressure gas storage cylinder 31, and the low-pressure gas storage cylinder 32.

[0045] Specifically, the control device 40 may include an automatic valve 41, a pressure transmitter 42, a temperature transmitter 43, and a control module 44. Among them, the automatic valve 41 is arranged on the connecting pipeline to control the on-off of the connecting pipeline, so that the control module 44 can control the connection or disconnection between each gas storage cylinder by controlling the on-off of the automatic valve 41.

[0046] Among them, the control module 44 may include an I / O module and a PLC program, so that the control module 44 can automatically complete the control of the experiment and the recovery of the experimental gas.

[0047] In addition, the control device 40 may also be provided with a report output system to record the working condition data during the experiment in real time and generate a report.

[0048] The pressure transmitter 42 and the temperature transmitter 43 are arranged on the connecting pipeline, the high-pressure gas storage cylinder group 20, the pressure vessel 10, the medium-pressure gas storage cylinder 31, and the low-pressure gas storage cylinder 32 to read the air pressure data and temperature data respectively, and transmit the air pressure data and temperature data to the control module 44.

[0049] The control module 44 is electrically connected to the automatic valve 41, the pressure transmitter 42, and the temperature transmitter 43 to control the on-off of the automatic valve 41 through the data fed back by the pressure transmitter 42 and the temperature transmitter 43.

[0050] Refer to Figure 1 , the pressure vessel cyclic test device may further include a first-stage compressor 51 and a second-stage compressor 52.

[0051] Among them, the first-stage compressor 51 and the second-stage compressor 52 are both connected to the control device 40, that is, the first-stage compressor 51 and the second-stage compressor 52 are both connected to the control module 44 to operate under the control of the control module 44.

[0052] It should be noted that the low-pressure side pressure at which the first-stage compressor 51 operates is lower than the low-pressure side pressure at which the second-stage compressor 52 operates, and the high-pressure side pressure at which the first-stage compressor 51 operates is also lower than the high-pressure side pressure at which the second-stage compressor 52 operates. Since the initial pressure value of the pressure vessel 10 should be maintained below the first pressure value and the initial pressure value is small, while the test pressure value is high, that is, the difference between the initial pressure value and the test pressure value is large, a single-stage compressor cannot meet the actual needs. Therefore, a two-stage compressor is provided to recover the experimental gas.

[0053] In this embodiment, when the pressure value in the low-pressure gas storage bottle 32 is higher than the first pressure value, the control device 40 can control the first-stage compressor 51 to operate to fill the experimental gas in the low-pressure gas storage bottle 32 into the medium-pressure gas storage bottle 31. When the pressure in the low-pressure gas storage bottle 32 is lower than the first pressure value, the control device 40 can control the first-stage compressor 51 to stop, so that the low-pressure gas storage bottle 32 stops filling the experimental gas into the medium-pressure gas storage bottle 31, and the pressure in the low-pressure gas storage bottle 32 is maintained at a state lower than the first pressure value, so that after the pressure vessel 10 transfers the experimental gas to the low-pressure gas storage bottle 32 by the mispressure relief method, the pressure value in the pressure vessel 10 can be reduced to a state less than the first pressure value, so that the pressure vessel 10 meets the requirement of relieving pressure to the specified relief value in the specification, and then the next filling and relief test is carried out.

[0054] When the pressure in the high-pressure gas storage bottle group 20 is lower than the second pressure value, the control device 40 can control the second-stage compressor 52 to operate to fill the experimental gas in the medium-pressure gas storage bottle 31 into the high-pressure gas storage bottle group 20 after being pressurized by the second-stage compressor 52 until the pressure in the high-pressure gas storage bottle group 20 is filled to the full-load pressure value.

[0055] Refer to Figure 1 , the pressure vessel circulation test device further includes a plurality of heating elements 60. The plurality of heating elements 60 are respectively arranged at the air outlets of the high-pressure gas storage bottle group 20, the pressure vessel 10, the medium-pressure gas storage bottle 31 and the low-pressure gas storage bottle 32 for heating the pipelines at the air outlets.

[0056] It should be noted that since the experimental gas is a Joule gas, when the high-pressure gas cylinder group 20, the pressure vessel 10, the medium-pressure gas cylinder 31, and the low-pressure gas cylinder 32 are depressurized, a positive Joule-Thomson effect is likely to occur at the outlet, that is, during the depressurization process, the pressure at the outlet will undergo a sudden change, causing the temperature at that place to drop sharply and resulting in frosting. Therefore, setting the heating element 60 at the outlets of the high-pressure gas cylinder group 20, the pressure vessel 10, the medium-pressure gas cylinder 31, and the low-pressure gas cylinder 32 can reduce the frosting phenomenon.

[0057] In addition, temperature detectors and pressure detectors are provided at the outlets of the high-pressure gas cylinder group 20, the pressure vessel 10, the medium-pressure gas cylinder 31, and the low-pressure gas cylinder 32, and the temperature detectors, pressure detectors, and the heating element 60 are also connected to the control module 44, so that the control module 44 can control the opening or closing of the heating element 60 through the data fed back by the temperature detectors and pressure detectors.

[0058] Refer to Figure 1 , the pressure vessel circulation test device further includes a recuperator 61. The recuperator 61 is arranged downstream of the outlet direction of the pressure vessel 10 and upstream of the medium-pressure gas cylinder 31 and the low-pressure gas cylinder 32, for heating the experimental gas flowing out of the pressure vessel 10.

[0059] The recuperator 61 is connected to the control module 44, so that the control module 44 can control the opening or closing of the recuperator 61.

[0060] During the test of the pressure vessel 10, the experimental gas in the pressure vessel 10 may flow through multiple times, resulting in a decrease in the temperature of the experimental gas. Therefore, by setting the recuperator 61 to heat the experimental gas, it helps to restore the temperature of the experimental gas to the preset temperature and ensure the accuracy of the test results.

[0061] Refer to Figure 1 , the pressure vessel circulation test device further includes a drying component 62. The drying group is arranged at the inlet of the low-pressure gas cylinder 32 for absorbing moisture in the test gas.

[0062] Since the temperature of the experimental gas changes during the flow process, when the water content in the experimental gas is greater than 100 ppm, water is likely to precipitate and form crystals when the temperature drops, thus blocking the connecting pipes and the automatic valve 41. Therefore, setting the drying component 62 can regularly dry the experimental gas to reduce the moisture in the experimental gas.

[0063] Refer to Figure 1 , the pressure vessel circulation test device further includes a flow meter 63. The flow meter 63 is arranged between the high-pressure gas cylinder group 20 and the pressure vessel 10 for reading the flow rate of the experimental gas between the high-pressure gas cylinder group 20 and the pressure vessel 10.

[0064] Refer to Figure 1 The pressure vessel cyclic test device further includes a gas discharging device 70. The gas discharging device 70 is connected between an external gas source 71 and the secondary compressor 52, so that the gas discharging device 70 can fill the external experimental gas into the high-pressure gas cylinder bank 20 through the secondary compressor 52.

[0065] The external gas source 71 can be set as a gas storage tank box or an infusion container for filling or supplementing the experimental gas to the high-pressure gas cylinder bank 20.

[0066] In summary, before the pressure vessel cyclic test device conducts a test, it is necessary to fill the experimental gas in the external gas source 71 into the high-pressure gas cylinder bank 20 through the gas discharging device 70 and the secondary compressor 52, so that the pressure in the high-pressure gas cylinder bank 20 reaches the second pressure value or above.

[0067] When the pressure vessel cyclic test device conducts a test, the control device 40 controls the high-pressure gas cylinder bank 20 to fill the experimental gas into the pressure vessel 10. When the pressure in the pressure vessel 10 reaches the preset experimental pressure, the high-pressure gas cylinder bank 20 stops filling the experimental gas into the pressure vessel 10, and the pressure vessel 10 maintains the pressure to complete the corresponding experiment. At the same time, the control device 40 records to record the corresponding values.

[0068] After the pressure vessel 10 completes a corresponding experiment, the control device 40 controls the pressure vessel 10 to preferentially discharge the test gas to the medium-pressure gas cylinder detection pipe 31, so that the experimental gas in the pressure vessel 10 is transferred to the medium-pressure gas cylinder 31 by means of mispressure discharge. When the difference between the pressure in the medium-pressure gas cylinder 31 and the pressure in the pressure vessel 10 reaches the preset value, the control device 40 controls the pressure vessel 10 to release pressure to the low-pressure gas cylinder 32 to discharge the experimental gas in the pressure vessel 10 into the low-pressure gas cylinder 32. When the air pressure in the pressure vessel 10 drops to the specified pressure value, the pressure vessel 10 stops discharging pressure to the low-pressure gas cylinder 32.

[0069] When the air pressure in the pressure vessel 10 is lower than the first pressure value, the above test process is repeated and multiple tests are conducted until the remaining pressure in the high-pressure gas cylinder bank 20 is lower than the second pressure value, that is, when the remaining pressure in the high-pressure gas cylinder bank 20 is not sufficient to complete an experiment, the control device 40 controls the medium-pressure gas cylinder 31 to recover the experimental gas to the high-pressure gas cylinder bank 20.

[0070] Therefore, the above pressure vessel cyclic test device can recover and recycle the experimental gas, thereby reducing the loss of the experimental gas and the experimental cost during multiple tests.

[0071] While the present utility model has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present utility model can be embodied in many forms without departing from the spirit or essence of the utility model, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be construed broadly within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A pressure vessel cycle test device, used for carrying out strength test, airtight test and type test on the pressure vessel to be tested, characterized in that: The pressure vessel cycle test device comprises: a high-pressure gas storage cylinder group, which is connected to the pressure vessel and is used to fill the pressure vessel with experimental gas so that the pressure in the pressure vessel reaches the test pressure value; A medium-pressure gas cylinder connected to the high-pressure gas cylinder group and the pressure vessel for recovering the experimental gas in the pressure vessel and capable of filling the experimental gas in the medium-pressure gas cylinder into the high-pressure gas cylinder group; A low-pressure gas storage cylinder connected to the pressure vessel and the medium-pressure gas storage cylinder for recovering the experimental gas in the pressure vessel and capable of filling the experimental gas in the low-pressure gas storage cylinder into the medium-pressure gas storage cylinder; A control device, which is connected to the high-pressure gas storage cylinder group, the pressure container, the medium-pressure gas storage cylinder and the low-pressure gas storage cylinder; Among them, when the pressure value in the low-pressure gas storage cylinder is higher than the first pressure value, the control device can control the low-pressure gas storage cylinder to fill the medium-pressure gas storage cylinder with experimental gas; when the pressure in the high-pressure gas storage cylinder group is lower than the second pressure value, the control device can control the medium-pressure gas storage cylinder to fill the high-pressure gas storage cylinder group with experimental gas.

2. The pressure vessel cycle test device according to claim 1, characterized in that: It also includes a primary compressor and a secondary compressor; the primary compressor and the secondary compressor are both connected to the control device; Among them, when the pressure in the low-pressure gas storage cylinder is higher than the first pressure value, the control device can control the first-stage compressor to work so as to fill the experimental gas in the low-pressure gas storage cylinder into the medium-pressure gas storage cylinder; when the pressure in the high-pressure gas storage cylinder group is lower than the second pressure value, the control device can control the second-stage compressor to work so as to fill the experimental gas in the medium-pressure gas storage cylinder into the high-pressure gas storage cylinder group.

3. The pressure vessel cycle test device according to claim 1, characterized in that: The high-pressure gas cylinder group includes multiple high-pressure gas cylinders; the multiple high-pressure gas cylinders can be connected to the pressure vessel so that the high-pressure gas cylinders can fill the pressure vessel with experimental gas; the multiple high-pressure gas cylinders can fill the pressure vessel with test gas by staggered pressure filling to improve the gas utilization and filling efficiency in the high-pressure gas cylinder group.

4. The pressure vessel cycle test device according to claim 1, characterized in that: It also includes multiple heating elements; the multiple heating elements are respectively arranged at the gas outlets of the high-pressure gas storage cylinder group, the pressure vessel, the medium-pressure gas storage cylinder and the low-pressure gas storage cylinder to heat the pipelines at the gas outlets.

5. The pressure vessel cycle test device according to claim 1, characterized in that: It also includes a reheater; the reheater is arranged downstream of the pressure vessel in the gas outlet direction and upstream of the medium-pressure gas storage cylinder and the low-pressure gas storage cylinder to heat the experimental gas flowing out of the pressure vessel.

6. The pressure vessel cycle test device according to claim 1, characterized in that: It also includes a drying component; the drying group is arranged at the gas inlet of the low-pressure gas storage cylinder to absorb moisture in the test gas.

7. The pressure vessel cycle test device according to claim 1, characterized in that: It also includes a flow meter; the flow meter is arranged between the high-pressure gas cylinder group and the pressure container to read the flow rate of the experimental gas between the high-pressure gas cylinder group and the pressure container.

8. The pressure vessel cycle test device according to claim 1, characterized in that: The control device includes an automatic valve, a pressure transmitter, and a temperature transmitter; the automatic valve is arranged on the connecting pipeline to control the on-off of the connecting pipeline; the pressure transmitter and the temperature transmitter are arranged on the connecting pipeline, the high-pressure gas cylinder group, the pressure container, the medium-pressure gas cylinder and the low-pressure gas cylinder to read the air pressure data and the temperature data respectively.

9. The pressure vessel cycle test device according to claim 8, characterized in that: The control device further comprises a control module; the control module is electrically connected to the automatic valve, the pressure transmitter and the temperature transmitter, so as to control the on and off of the automatic valve through the data fed back by the pressure transmitter and the temperature transmitter.

10. The pressure vessel cycle test device according to claim 2, characterized in that: It also includes a gas unloading device; the gas unloading device is connected between the external gas source and the secondary compressor, so that the gas unloading device can fill the external experimental gas into the high-pressure gas storage cylinder group through the secondary compressor.

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