Cryopump test platform

Abstract

The application relates to the field of cryogenic pump testing, in particular to a cryogenic pump testing platform, which comprises a shell, a pump body and a detection unit, the inside of the shell is formed with a testing cavity with an open end, the testing cavity is used for simulating a pumping pipeline of a fusion device, the pump body is accommodated in the testing cavity, one end of the pump body is in closed connection with the open end of the shell to form a closed testing cavity, and the detection unit is arranged on the shell and used for detecting the gas pressure, the gas type in the testing cavity and / or the vibration condition of the shell, so that the performance test of a large-diameter embedded cryogenic pump can be realized.

Description

Technical Field

[0001] This application relates to the field of cryogenic pump testing, and in particular to a cryogenic pump testing platform. Background Technology

[0002] Among related technologies, fusion devices are among the most complex scientific and engineering systems built by humankind, comprising dozens of subsystems such as vacuum systems and cryogenic systems. The vacuum system of a fusion device provides an insulating environment for cryogenic superconductivity in the fusion reactor, a clean environment for high-temperature plasma fusion reactions, and ensures efficient fuel recycling, thus forming the foundation for the continuous operation of the fusion reaction.

[0003] The vacuum system includes a cryogenic pump, which is a type of cryogenic condensation adsorption pump. Cryogenic pumps are mainly used in fusion devices to remove some impurity gases during plasma operation. However, there is currently a lack of corresponding testing platforms for large-diameter cryogenic pumps that are embedded in fusion pipelines used in fusion devices. Therefore, how to achieve performance testing of large-diameter embedded cryogenic pumps has become the technical problem to be solved in this application. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, one objective of this application is to provide a cryogenic pump testing platform capable of performing performance testing on large-diameter embedded cryogenic pumps.

[0005] A cryogenic pump testing platform according to an embodiment of this application includes: a housing, wherein a test chamber with one end open is formed inside the housing, the test chamber being used to simulate the gas extraction pipe of a fusion device; a pump body, wherein the pump body is housed within the test chamber, one end of the pump body being closedly connected to the open end of the housing to form a closed test chamber; and a detection unit, wherein the detection unit is disposed in the housing and is used to detect the gas pressure, gas type and / or vibration of the housing within the test chamber.

[0006] According to the cryogenic pump testing platform of this application embodiment, a closed test chamber simulating the gas extraction pipeline of a fusion device is formed by a shell. The pump body is housed and sealed within the test chamber, and a detection unit set in the shell completes the performance test. Since it replicates the actual installation and working environment of a large-diameter embedded cryogenic pump in a fusion device, it ensures the consistency of test conditions and application scenarios, providing a core guarantee for the accuracy of performance test results. The detection unit specifically acquires key parameters such as gas pressure, gas type, and shell vibration, matching the core function of the cryogenic pump in removing impurity gases and the operational stability requirements, realizing a comprehensive and effective test of the performance of this type of cryogenic pump. This solves the technical problem of the lack of a corresponding testing platform in the prior art, and provides reliable technical support for the performance verification, quality control, and subsequent optimization of this type of cryogenic pump.

[0007] According to some embodiments of the cryogenic pump testing platform of this application, a detection space is formed between the other end of the pump body and the other end of the test chamber, and a detection port communicating with the detection space is provided on the housing; wherein the detection unit is disposed on the outer periphery of the housing and connected to the detection space through the detection port.

[0008] According to some embodiments of the cryogenic pump testing platform of this application, the pump body is provided with an openable and closable pump port at the end facing the test space, and the diameter of the pump port is D; wherein the distance between the end of the pump body and the other end face of the test chamber is L and satisfies: 1.2D≤L≤1.7D.

[0009] According to some embodiments of the cryogenic pump testing platform of this application, the axial distance between the detection port and the pump port is M, and satisfies: 0.3D≤M≤0.8D.

[0010] The cryogenic pump testing platform according to some embodiments of this application further includes: a vacuum pump, which is connected to the test chamber for evacuating the test chamber; the detection unit includes: a leak detector, which is connected to the test chamber, and is used to detect the target gas in the test chamber after the test chamber reaches a preset vacuum level and the pump port is closed, by injecting the target detection gas into the pump body to determine the leakage of the pump body.

[0011] According to some embodiments of the cryogenic pump testing platform of this application, the testing unit includes: a vibration tester, which is disposed in the housing to detect the vibration frequency of the pump body during operation.

[0012] According to some embodiments of the cryogenic pump testing platform of this application, the housing is constructed as a cylindrical body with an open axial end, and the outer shell of the pump body is constructed as a column, which is housed within the cylindrical body; wherein a support member is provided on the inner wall of the cylindrical body and / or the outer peripheral wall of the outer shell, and the support member is used to support the outer shell radially against the inner wall of the testing chamber.

[0013] According to some embodiments of the cryogenic pump test platform of this application, a guide wheel is formed at the radial outer end of the support member, and the rotation axis of the guide wheel extends tangentially along the cross-sectional circle of the pump body shell.

[0014] The cryogenic pump test platform according to some embodiments of this application further includes: a support base disposed at the bottom of the housing, the support base having a groove formed on it for adapting to the outer surface of the housing.

[0015] The cryogenic pump testing platform according to some embodiments of this application further includes: a gas injection device, the gas injection device having a gas outlet communicating with the test chamber, the gas injection device selectively injecting at least one gas into the test chamber; and a heating element disposed between the gas outlet and the test chamber for selectively heating the gas entering the test chamber.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of a cryogenic pump testing platform according to an embodiment of this application;

[0019] Figure 2 This is a cross-sectional structural diagram of the cryogenic pump test platform and the cryogenic pump according to an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the connection between the cryogenic pump test platform and the detection unit according to an embodiment of this application.

[0021] Figure label:

[0022] 100. Cryogenic pump testing platform;

[0023] 1. Housing; 11. Test chamber; 111. Detection port;

[0024] 2. Pump body; 21. Pump inlet;

[0025] 31. Leak detector; 32. Vibration tester; 33. Vacuum gauge; 34. Residual gas analyzer;

[0026] 4. Vacuum pump;

[0027] 5. Support components; 51. Guide wheels;

[0028] 6. Support base; 61. Groove;

[0029] 7. Gas injection device; 71. Mass flow meter; 8. Heating element; 9. Lifting lug. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] The following is for reference. Figures 1-3 A cryogenic pump test platform 100 according to an embodiment of this application is described.

[0032] According to an embodiment of this application, a cryogenic pump testing platform 100 includes a housing 1, a pump body 2, and a detection unit. A test chamber 11 with one end open is formed inside the housing 1. The test chamber 11 is used to simulate the gas extraction pipe of a fusion device. The pump body 2 is housed in the test chamber 11, and one end of the pump body 2 is closedly connected to the open end of the housing 1 to form a closed test chamber 11. The detection unit is disposed in the housing 1 and is used to detect the gas pressure, gas type, and / or vibration of the housing 1 in the test chamber 11.

[0033] Understandably, a test chamber 11 with one end open is formed inside the casing 1. The test chamber 11 is used to simulate the gas extraction pipeline of a fusion device. The structural design of the test chamber 11 can match the external dimensions and installation requirements of a large-diameter embedded cryogenic pump, providing this type of cryogenic pump with spatial conditions completely consistent with its actual embedded installation in a fusion device. The pump body 2 is housed within the test chamber 11, and one end of the pump body 2 is closedly connected to the open end of the casing 1. This connection method makes the test chamber 11 form a complete closed structure. This closed structure can not only simulate the closed environment of the gas extraction pipeline of a fusion device, but also restore the sealed space state in which the cryogenic pump is located during actual operation, eliminating the difference between the test environment and the actual application environment, ensuring that the working state of the cryogenic pump during the test is consistent with the actual operating state, and providing a true basis for the subsequent performance test results. The robustness and reliability provide core assurance. Furthermore, the detection unit is located in the housing 1, and its detection functions directly correspond to the core working performance and operational status evaluation requirements of the cryogenic pump. Among them, the detection of gas pressure in the test chamber 11 can reflect the effect of the cryogenic pump on the gas removal in the test chamber 11 during operation in real time. By monitoring the change trend of gas pressure, key performance indicators such as the pumping rate and ultimate vacuum of the cryogenic pump can be accurately determined. The detection of gas type in the test chamber 11 can clarify the pumping efficiency of the cryogenic pump for different types of impurity gases, which is in line with its core function of removing impurity gases in the fusion device. The detection of vibration of the housing 1 can capture the vibration signals generated during the operation of the cryogenic pump, thereby judging its stability and structural adaptability during operation, and avoiding the impact of vibration problems on the overall operational safety of the fusion device. By comprehensively collecting and analyzing the aforementioned key parameters through the detection unit, the core performance data and operating status information of the large-diameter embedded cryogenic pump can be obtained systematically and comprehensively. This fully realizes the performance testing of this type of cryogenic pump, effectively solving the technical problem of the lack of a testing platform for large-diameter embedded cryogenic pumps in the existing technology. It provides a comprehensive performance verification method for the reliable application of this type of cryogenic pump in fusion devices, and also provides accurate test data support for the design optimization and performance improvement of this type of cryogenic pump.

[0034] In short, the shell 1 forms a closed test chamber 11 simulating the gas extraction pipeline of a fusion device. The pump body 2 is housed and sealed within the test chamber 11. Performance testing is completed in conjunction with the detection unit set in the shell 1. By replicating the actual installation and working environment of a large-diameter embedded cryogenic pump in a fusion device, the consistency between test conditions and application scenarios is ensured, providing a core guarantee for the accuracy of performance test results. The detection unit specifically acquires key parameters such as gas pressure, gas type, and shell 1 vibration, matching the core function of the cryogenic pump in removing impurity gases and the operational stability requirements. This enables effective testing of the core performance of this type of cryogenic pump, solving the technical problem of the lack of a corresponding test platform in the existing technology. It provides reliable technical support for the performance verification, quality control, and subsequent optimization of this type of cryogenic pump.

[0035] It should be noted that, in some embodiments of this application, the pump body 2 is a cryogenic pump for a fusion device.

[0036] According to some embodiments of the present application, a cryogenic pump test platform 100 is provided with a detection space between the other end of the pump body 2 and the other end of the test chamber 11, and a detection port 111 communicating with the detection space is provided on the housing 1; wherein the detection unit is disposed on the outer periphery of the housing 1 and connected to the detection space through the detection port 111.

[0037] The other end of the pump body 2 is spaced apart from the other end of the test chamber 11 to form a detection space. The formation of the detection space ensures that the gas flow path in the test chamber 11 is consistent with the actual path of the gas flowing through the cryogenic pump in the fusion device's gas extraction pipe, thus ensuring that the gas environment faced by the cryogenic pump during the test is consistent with the actual working scenario. The detection port 111 on the shell 1 is connected to the detection space, and the detection unit is located on the outer periphery of the shell 1 and connected to the detection space through the detection port 111. This avoids the detection unit occupying the internal space of the test chamber 11, preventing interference with the normal installation and operation of the cryogenic pump. It also allows the detection unit to directly contact the gas in the detection space, shortening the detection path and improving the response speed and detection accuracy of gas pressure and gas type detection. At the same time, the installation method of setting the detection unit on the outer periphery of the shell 1 facilitates the installation, debugging and maintenance of the detection unit. Furthermore, the targeted connection between the detection port 111 and the detection space enables the detection unit to collect gas parameters in the detection space and vibration signals of the shell 1, comprehensively capturing the performance and state changes of the cryogenic pump during operation. This further improves the comprehensiveness, accuracy and convenience of performance testing of large-diameter embedded cryogenic pumps, providing a more reliable technical guarantee for the performance verification of this type of cryogenic pump and effectively supporting the stable application of cryogenic pumps in fusion devices.

[0038] According to some embodiments of the present application, the cryogenic pump test platform 100 has an openable and closable pump port 21 at the end of the pump body 2 facing the test space, and the diameter of the pump port 21 is D; wherein the distance between the end of the pump body 2 and the other end face of the test chamber 11 is L and satisfies: 1.2D≤L≤1.7D.

[0039] It should be noted that when L is less than 1.2D, the volume of the detection space is too small, which restricts the gas flow space between the pump port 21 and the other end face of the test chamber 11. The gas cannot form a flow state consistent with the actual scenario of the fusion device within the detection space, easily leading to gas stagnation or localized pressure anomalies near the pump port 21. Simultaneously, the confined space interferes with the effective sampling of the detection unit, causing the collected gas pressure and gas type data to fail to accurately reflect the pumping performance of the cryogenic pump, affecting the accuracy of the test results. When L is greater than 1.7D, the volume of the detection space is too large, resulting in an excessively long diffusion path for the gas discharged from the pump port 21 within the detection space. This reduces the uniformity of gas pressure and concentration distribution, significantly differing from the compact pumping pipeline environment of the cryogenic pump in the fusion device. The workload of the cryogenic pump in this state is inconsistent with the actual operating load, and the excessively long gas diffusion path causes the parameters detected by the detection unit to lag behind the actual operating state of the cryogenic pump. Furthermore, an excessively large detection space may cause gas flow instability, further reducing the reliability of the test data. The size range of 1.2D to 1.7D avoids the limitations of excessively small spaces on gas flow and sampling, while also preventing excessively large spaces from causing the test environment to become disconnected from the actual scenario. This ensures that the gas flow state and pressure distribution in the test space are highly consistent with the actual working environment of the cryogenic pump in the fusion device, enabling the test unit to collect parameters that reflect the true performance of the cryogenic pump in a timely manner. This effectively improves the accuracy and effectiveness of performance testing of large-diameter embedded cryogenic pumps and provides reliable spatial support for the performance verification of this type of cryogenic pump.

[0040] According to some embodiments of the present application, the distance between the detection port 111 and the pump port 21 in the axial direction of the cryogenic pump test platform 100 is M, and satisfies: 0.3D≤M≤0.8D.

[0041] It should be noted that when M is less than 0.3D, the distance between the detection port 111 and the pump port 21 is too close, and the sampling area is too close to the gas intake end of the pump port 21. At this time, the gas has just entered the vicinity of the pump port 21 and has not yet formed a stable flow and pressure distribution. It may also be affected by the local airflow disturbance caused by the opening and closing action of the pump port 21. As a result, the gas pressure and gas type data collected by the detection unit cannot accurately reflect the actual effect of the cryogenic pump after removing impurity gases, resulting in distorted test data. When M is greater than 0.8D, the distance between the detection port 111 and the pump port 21 is too far, and the sampling area is far from the core working range of the pump port 21. The gas will undergo natural diffusion or concentration decay in the detection space, which is significantly different from the gas working state of the cryogenic pump in the fusion device's gas extraction pipeline during actual operation. The detected gas parameters are difficult to directly correlate with the pumping efficiency and impurity gas removal capacity of the cryogenic pump, resulting in a disconnect between the test results and the actual performance of the cryogenic pump. The size range of 0.3D to 0.8D places the detection port 111 in the optimal sampling interval between the core functional area of ​​the pump port 21 and the stable gas diffusion area. This avoids airflow disturbance interference caused by excessively close distances and prevents parameter attenuation and correlation failures caused by excessively long distances. This ensures that the detection unit can collect stable gas parameters directly related to the pumping performance of the cryogenic pump. At the same time, this distance setting is compatible with the overall size of the detection space, further ensuring the consistency between the test environment and the actual scenario of the fusion device. This significantly improves the accuracy and reliability of performance testing of large-diameter embedded cryogenic pumps and provides sampling position support for the core function verification of this type of cryogenic pump.

[0042] The cryogenic pump testing platform 100 according to some embodiments of this application further includes a vacuum pump 4, which is connected to the test chamber 11 to evacuate the test chamber 11; the detection unit includes a leak detector 31, which is connected to the test chamber 11. The leak detector 31 is used to detect the target gas in the test chamber 11 after the test chamber 11 reaches a preset vacuum level and the pump port 21 is closed, by injecting the target detection gas into the pump body 2 to determine the leakage of the pump body 2.

[0043] Vacuum pump 4 is connected to test chamber 11 and evacuates test chamber 11, simulating the vacuum working environment of the cryogenic pump in the fusion device. This creates a basic condition that conforms to the actual application scenario for pump body 2 leak detection, ensuring that the leak test is carried out under a vacuum background consistent with the actual operation of the cryogenic pump, avoiding interference from external gases in the test results. The leak detector 31 included in the detection unit is connected to the test chamber 11. After the test chamber 11 reaches the preset vacuum level and the pump port 21 is closed, the leak detector 31 can specifically detect the presence of the target detection gas in the test chamber 11 by injecting the target detection gas into the pump body 2. Its working logic directly corresponds to the core evaluation requirements of the sealing performance of the pump body 2. If there is a leak in the pump body 2, the injected target detection gas will overflow from the leak point into the test chamber 11. The leak detector 31 can accurately determine the leakage situation of the pump body 2 by capturing the target gas. This detection method can directly and accurately reflect the sealing performance of the pump body 2. Sealing performance is a key prerequisite for the cryogenic pump to maintain an adiabatic environment, a clean environment, and efficient fuel circulation in the fusion device. Once there is a leak in the pump body 2, it will directly affect the continuous operation of the fusion reaction. By working together with vacuum pump 4 and leak detector 31, a precise test of the sealing performance of large-diameter embedded cryogenic pumps was achieved, ensuring that the tested sealing performance data is highly consistent with the actual application requirements. This provides key performance verification for the reliable operation of this type of cryogenic pump in fusion devices, further improves the overall performance testing system of cryogenic pumps, and enhances the comprehensiveness and practicality of the test.

[0044] Specifically, after opening the pump port 21 to connect the inside of the pump body 2 with the inside of the test chamber 11, the vacuum pump 4 can simultaneously perform a vacuuming operation on the inside of the test chamber 11 and the pump body 2. This process can simultaneously remove residual gas inside the test chamber 11 and the pump body 2, ensuring that the entire detection system is in a clean vacuum environment and eliminating background gas interference for subsequent leak rate detection. When the vacuum level reaches the opening requirement of the leak detector 31, the pump port 21 is closed to isolate the inside of the pump body 2 from the test chamber 11. Closing the exhaust port of the vacuum pump 4 can maintain the vacuum state of the test chamber 11. Opening the valve of the leak detector 31 interface establishes the detection path between the leak detector 31 and the test chamber 11. After a certain amount of helium is introduced from one end of the pump body 2, if there is a leak in the pump body 2, the helium will permeate into the inside of the test chamber 11 through the leakage channel. The leak detector 31 can capture the helium signal in the test chamber 11. By detecting the helium concentration, it can determine whether the fusion cryogenic pump is leaking. At the same time, it quantifies the leakage rate index based on the helium permeation rate, and then assesses whether the leakage rate meets the standard. This realizes the quantitative testing of the leakage situation and leakage rate of the large-diameter embedded cryogenic pump, ensuring that the test results directly reflect the sealing performance of the pump body 2 under actual vacuum working conditions.

[0045] According to some embodiments of this application, the cryogenic pump test platform 100 includes a detection unit including a vibration tester 32, which is disposed in the housing 1 to detect the vibration frequency of the pump body 2 during operation.

[0046] Understandably, when a cryogenic pump is embedded in a fusion device, the vibrations it generates during operation will be transmitted to the fusion extraction pipeline, potentially affecting the overall stability of the fusion device. In the testing device, shell 1 simulates the extraction pipeline of the fusion device, and the vibrations generated by the pump body 2 are transmitted to shell 1 through the connection structure between pump body 2 and shell 1. Therefore, the vibration frequency of shell 1 can indirectly reflect the operating vibration state of the cryogenic pump. Vibration tester 32 is installed on shell 1; by detecting the vibration frequency of shell 1, vibration characteristic data of the cryogenic pump during operation can be obtained. This data can directly assess the stability of the cryogenic pump's operation and determine whether there is abnormal vibration caused by unreasonable structural design or component assembly problems. If the cryogenic pump exhibits abnormal vibration, it may cause resonance with the fusion pipeline in practical applications, affecting the vacuum sealing performance of the fusion device or the normal operation of other subsystems. The vibration tester 32 can detect such potential risks in advance.

[0047] Specifically, following the leak detection test after helium gas introduction, closing the interface valve of the leak detector 31 cuts off the connection between the leak detector 31 and the test chamber 11, preventing gas flow or temperature changes during subsequent evacuation and cooling from affecting the leak detector 31, while maintaining the sealing of the detection system. Opening the pump port 21 reconnects the pump body 2 to the test chamber 11, and reopening the exhaust port of the vacuum pump 4 synchronously evacuates both the test chamber 11 and the pump body 2, ensuring that residual gas is completely removed, creating a clean and uniform vacuum environment. When the overall vacuum level reaches the opening requirement of the pump body 2, the exhaust port of the vacuum pump 4 is closed to maintain the system vacuum. At this time, a cryogenic medium is introduced into one end of the pump body 2 to cool it, simulating the low-temperature environment of a cryogenic pump operating in a fusion device, ensuring the cooling process is consistent with the actual cooling scenario. During the cooling process, the vibration tester 32 continuously records data. Based on this data, a cooling rate versus vibration frequency curve can be plotted. This curve directly reflects the vibration characteristics of the cryogenic pump at different cooling stages. The vibration intensity of the cryogenic pump after installation in the fusion device is closely related to its vibration characteristics during the cooling process. By analyzing this curve, the vibration intensity of the cryogenic pump after installation on the fusion device can be accurately predicted, and abnormal vibration peaks or resonance risks that may occur during the cooling process can be identified in advance. This detection method combines the cooling process with vibration detection, which not only restores the actual working conditions of the cryogenic pump but also realizes dynamic monitoring of vibration characteristics. It provides accurate vibration data support for the subsequent installation and adaptation on the fusion device, helps optimize the installation structure or take vibration reduction measures, and ensures the stability of the cryogenic pump during the cooling operation phase in the fusion device.

[0048] In some embodiments of this application, a vacuum gauge 33 is also provided. The vacuum gauge 33 is disposed on the housing 1 and communicates with the test chamber 11. It is used to measure the vacuum level in the test chamber 11. Furthermore, it can also measure the ultimate vacuum level of the pump body 2. Specifically, after the cryogenic pump is introduced with a cryogenic medium, the vacuum drop curve is recorded. When the vacuum level stabilizes and no longer drops, it is the ultimate vacuum level of the pump body 2. If the vacuum level rises significantly, it means that the internal cryogenic medium pipeline of the pump body 2 has leaked.

[0049] According to some embodiments of the present application, the cryogenic pump test platform 100 has a housing 1 constructed as a cylindrical body with an open axial end. The pump body 2 has an outer shell constructed as a column, which is housed within the cylindrical body. A support member 5 is provided on the inner wall of the cylindrical body and / or the outer peripheral wall of the outer shell. The support member 5 is used to support the outer shell against the inner wall of the test chamber 11 in the radial direction.

[0050] The housing 1 is cylindrical with an open axial end. The outer shell of the pump body 2 is cylindrical and housed within the cylinder, providing a mounting base for the support member 5. The support member 5 is located on the inner wall of the cylinder and / or the outer peripheral wall of the outer shell, supporting the outer shell of the pump body 2 radially against the inner wall of the test chamber 11. This radial support forms a positioning constraint on the pump body 2. During the test, the cryogenic pump undergoes operations such as vacuuming, cooling, and gas introduction. These processes may induce structural stress due to gas flow and temperature changes. Without radial support, the pump body 2 may experience radial displacement or shaking within the test chamber 11, causing a change in the relative position between the pump body 2 and the housing 1. This would compromise the sealing of the test chamber 11 and the stability of the test space, thereby affecting the accuracy of test parameters such as gas pressure and gas type. Furthermore, the displacement of the pump body 2 may also cause changes in the vibration transmission path, distorting the vibration frequency data collected by the vibration tester 32. The support member 5 provides stable support force in the radial direction, which restricts the radial displacement of the pump body 2 in the test chamber 11, ensuring that the pump body 2 is always in the preset installation position, maintaining the relative position between the pump body 2 and the housing 1, ensuring the stability of the closed structure of the test chamber 11 and the dimensional accuracy of the test space, and keeping the gas flow state, pressure distribution and vibration transmission path consistent with the preset test conditions. This effectively prevents the displacement and shaking of the pump body 2 during the test, eliminates the test interference caused by the change in the position of the pump body 2, and thus significantly improves the accuracy of the performance test of the large-diameter embedded cryogenic pump.

[0051] According to some embodiments of the present application, a cryogenic pump test platform 100 has a guide wheel 51 formed at the radial outer end of the support member 5, and the rotation axis of the guide wheel 51 extends tangentially along the cross-sectional circle of the pump body 2 outer shell.

[0052] The radially outer end of the support member 5 forms a guide wheel 51, and the rotation axis of the guide wheel 51 extends tangentially along the cross-sectional circle of the pump body 2's outer shell. The outer shell of the pump body 2 is cylindrical, and its installation process into the housing 1 is essentially a linear advancing motion along the axial direction of the cylinder. The tangential extension direction of the rotation axis of the guide wheel 51 ensures that the rotation direction of the guide wheel 51 is consistent with the entry direction of the pump body 2. When the pump body 2 is axially embedded into the housing 1, the outer peripheral wall of the pump body 2's outer shell will come into contact with the guide wheel 51. The original sliding friction is transformed into rolling friction of the guide wheel 51. The resistance generated by rolling friction is much smaller than that of sliding friction, significantly reducing the mechanical resistance experienced by the pump body 2 during its advancement. Meanwhile, while the guide wheel 51 provides radial support and positioning for the outer shell of the pump body 2, its rolling characteristics guide the pump body 2 to move along a preset axial path, preventing the pump body 2 from getting stuck or having installation deviations due to radial offset during installation. This ensures that the pump body 2 can smoothly enter the preset installation position of the housing 1, simplifying the operation process of embedding and installing the pump body 2, reducing installation difficulty, improving installation efficiency, and making the assembly process of the large-diameter embedded cryogenic pump and the testing device more convenient and reliable.

[0053] It should be noted that the guide wheel 51 is a metal component. Metal materials inherently possess extremely low outgassing rates. In the vacuum environment of the testing device, this effectively reduces the amount of gas released by the guide wheel 51 itself, preventing additional gas from entering the testing chamber 11 and affecting the internal vacuum level and gas purity. The gas pressure and gas type in the testing chamber 11 are core detection parameters for evaluating the pumping performance of the cryogenic pump. If the guide wheel 51 releases gas, it will cause distortion in the gas data collected by the detection unit, failing to accurately reflect the actual pumping effect of the cryogenic pump. The metal guide wheel 51 reduces the interference of material outgassing on the testing environment, ensuring that the testing chamber 11 always maintains a clean vacuum state consistent with the actual operation of the fusion device. Simultaneously, the metal material possesses excellent vibration transmission properties. As a contact support component between the pump body 2 and the housing 1, the guide wheel 51 can accurately transmit the vibrations generated during the operation of the cryogenic pump to the housing 1. The vibration tester 32 is installed on the housing 1. The vibration signal of the housing 1 detected by the tester directly depends on the integrity of the vibration transmission. The metal guide wheel 51 avoids vibration attenuation or distortion that may be caused by non-conductive or low-conductivity materials, so that the vibration tester 32 can capture real and accurate vibration frequency data, providing a reliable basis for the stability analysis of cryogenic pump operation.

[0054] The cryogenic pump test platform 100 according to some embodiments of this application further includes a support base 6, which is disposed at the bottom of the housing 1, and a groove 61 is formed on the support base 6 for adapting to the outer surface of the housing 1.

[0055] The support base 6 is located at the bottom of the housing 1. The groove 61 formed by the support base 6 is adapted to the outer surface of the housing 1. The stable positioning of the housing 1 is achieved through close support. The adaptability of the groove 61 to the outer surface of the housing 1 allows the support base 6 to provide comprehensive support for the housing 1, increasing the contact area between the two and distributing the weight load of the housing 1 and the internal pump body 2. This prevents deformation or positional displacement of the housing 1 due to localized stress concentration, ensuring that the housing 1 maintains the preset structural shape during the test. The support base 6 isolates the housing 1 from direct contact with the mounting surface through bottom support, reducing the transmission interference of external environmental vibration to the housing 1 and preventing external vibration from being superimposed on the vibration generated by the cryogenic pump operation. This ensures that the vibration signal of the housing 1 collected by the vibration tester 32 originates only from the cryogenic pump itself, improving the authenticity of the vibration detection data. In addition, the stable support structure provides a reliable foundation for various test operations such as vacuum pump 4 vacuuming and leak detector 31 detection, preventing loosening of pipe connections or failure of seals due to shaking of the housing 1, ensuring the smooth progress of the test process, and improving the accuracy and reliability of cryogenic pump performance testing.

[0056] The cryogenic pump test platform 100 according to some embodiments of this application further includes: a gas injection device 7 and a heating element 8. The gas injection device 7 is provided with a gas outlet, which is connected to the test chamber 11. The gas injection device 7 can selectively inject at least one gas into the test chamber 11. The heating element 8 is disposed between the gas outlet and the test chamber 11 for selectively heating the gas entering the test chamber 11.

[0057] Understandably, the outlet of the gas injection device 7 is connected to the test chamber 11 and can selectively inject at least one gas. This simulates the various impurity gas environments that the cryogenic pump may face in a fusion device, replicating the gas composition scenarios that the cryogenic pump needs to handle in actual operation. This makes the test more closely aligned with practical application requirements. The heating element 8 is located between the outlet and the test chamber 11 and can selectively heat the gas entering the test chamber 11. It can adjust the temperature parameters of the injected gas, restoring the temperature state of the gas under different operating stages in the fusion device, thus overcoming the limitations of testing under a single temperature condition. The collaborative work of the two devices allows the test chamber 11 to flexibly construct composite test environments with different gas compositions and temperatures, comprehensively covering the complex operating conditions of the cryogenic pump in the fusion device. This enables the detection unit to specifically test the core performance of the cryogenic pump under different gas types and temperature conditions, such as pumping efficiency and gas handling capacity, avoiding the problem of incomplete performance evaluation due to a single test environment. Meanwhile, the optional gas injection and heating functions support specialized performance tests and extreme condition tests on cryogenic pumps, providing diverse test conditions for performance optimization and compatibility verification of cryogenic pumps. This further enhances the practicality of the test device and the comprehensiveness of the test results, ensuring that cryogenic pumps can operate stably and reliably under the complex operating conditions of fusion devices.

[0058] In some embodiments of this application, a residual gas analyzer 34 is also included. The residual gas analyzer 34 is disposed on the housing 1 and communicates with the test chamber 11. The residual gas analyzer 34 is used to monitor the partial pressure of each gas during the mixed gas test.

[0059] It should be noted that one of the gases is helium and the other is hydrogen. Specifically, by opening the mass flow meter 71 at the corresponding gas end separately, adjusting the flow rate and recording the vacuum degree recorded by the vacuum gauge 33, the pumping speed of the cryogenic pump for a single helium or a single hydrogen can be calculated, realizing a special test of the single gas pumping performance of the cryogenic pump, and meeting the verification requirements of the cryogenic pump's pumping capability for different single impurity gases in the fusion device.

[0060] Meanwhile, the ratio of helium and hydrogen can be controlled by adjusting the two mass flow meters 71. The residual gas analyzer 34 can monitor the partial pressure of the two gases in real time. Combined with the recorded total vacuum, the overall pumping speed of the cryogenic pump for different proportions of mixed gases and the individual pumping speed for each gas can be calculated. This fully replicates the complex scenario of multiple impurity gases coexisting in the fusion device, ensuring that the test results can reflect the working performance of the cryogenic pump in the actual mixed gas environment. Furthermore, the heating element 8 regulates the temperature of the introduced gas through the heating belt controller, simulating the gas environment under extreme temperature conditions and testing the impact of temperature changes on the pumping speed performance of the cryogenic pump. By coordinating the adjustment of the mass flow meter 71 and the heating belt controller, the composition ratio and temperature state of the exhaust gas during the actual operation of the fusion device can be reproduced, making the test environment highly consistent with the actual exhaust gas discharge scenario of the fusion device. Through the coordinated work of multiple components, the pumping speed of the cryogenic pump for single gas, mixed gas, and extreme temperature gas can be detected, covering various operating conditions of the cryogenic pump in the fusion device. It also provides a device for performance verification of the cryogenic pump in response to actual exhaust gas discharge conditions, significantly improving the scenario adaptability of the test device and the practicality of the test results, and providing comprehensive data support for the performance optimization and reliable application of the cryogenic pump.

[0061] In some embodiments of this application, the housing 1 is also provided with a plurality of lifting lugs 9, which are used to transport the test device to the test site.

[0062] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0063] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0064] In the description of this application, "multiple" means two or more.

[0065] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0066] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A cryogenic pump testing platform, characterized in that, include: The housing (1) has a test chamber (11) with one end open inside, which is used to simulate the gas extraction pipe of the fusion device; Pump body (2), the pump body (2) is housed in the test chamber (11), one end of the pump body (2) is closed and connected to the open end of the housing (1) to form the closed test chamber (11). A detection unit is disposed in the housing (1) and is used to detect the gas pressure, gas type and / or vibration of the housing (1) in the test chamber (11); The other end of the pump body (2) is spaced apart from the other end of the test chamber (11) to form a detection space, and the housing (1) is provided with a detection port (111) that communicates with the detection space. in The detection unit is disposed on the outer periphery of the housing (1) and connected to the detection space through the detection port (111); Also includes: A vacuum pump (4) is connected to the test chamber (11) for evacuating the test chamber (11). The pump body (2) has an openable and closable pump port (21) at the end facing the test space. The detection unit includes a leak detector (31), which is connected to the test chamber (11). The leak detector (31) is used to detect the target gas in the test chamber (11) after the test chamber (11) reaches a preset vacuum and the pump port (21) is closed, by injecting the target detection gas into the pump body (2) to determine the leakage of the pump body (2).

2. The cryogenic pump testing platform according to claim 1, characterized in that, The diameter of the pump inlet (21) is D; where The distance between the end of the pump body (2) and the other end face of the test chamber (11) is L and satisfies: 1.2D≤L≤1.7D.

3. The cryogenic pump testing platform according to claim 1, characterized in that, The axial distance between the detection port (111) and the pump port (21) is M, and satisfies: 0.3D≤M≤0.8D.

4. The cryogenic pump testing platform according to claim 1, characterized in that, The detection unit includes a vibration tester (32), which is disposed on the housing (1) for detecting the vibration frequency of the pump body (2) during operation.

5. The cryogenic pump testing platform according to claim 1, characterized in that, The housing (1) is constructed as a cylindrical body with its axial ends open. The outer shell of the pump body (2) is constructed as a column, which is housed within the cylindrical body. in A support member (5) is provided on the inner wall of the cylinder and / or the outer peripheral wall of the outer shell. The support member (5) is used to support the outer shell on the inner wall of the test cavity (11) in the radial direction.

6. The cryogenic pump testing platform according to claim 5, characterized in that, The outer radial end of the support member (5) is provided with a guide wheel (51), and the rotation axis of the guide wheel (51) extends tangentially along the cross-sectional circle of the outer shell of the pump body (2).

7. The cryogenic pump testing platform according to claim 5, characterized in that, Also includes: Support base (6) is disposed at the bottom of the housing (1), and a groove (61) is formed on the support base (6) for fitting the outer surface of the housing (1).

8. The cryogenic pump testing platform according to claim 1, characterized in that, Also includes: A gas injection device (7) is provided with an outlet, which is connected to the test chamber (11). The gas injection device (7) can selectively inject at least one gas into the test chamber (11). A heating element (8) is disposed between the gas outlet and the test chamber (11) for selectively heating the gas entering the test chamber (11).

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