System for measuring density of liquid alkali metal

Abstract

The embodiment of the invention relates to the field of testing the density of materials, in particular to a system for measuring the density of liquid alkali metal, which comprises an alkali metal container for accommodating the liquid alkali metal; the heating device is used for providing heat for the alkali metal container; the measuring matching piece is hung on the tension measuring piece, so that the tension borne by the measuring matching piece is measured by the tension measuring piece; the measurement lifting device is arranged to be capable of driving the tension measurement piece and the measurement matching piece to lift relative to the alkali metal container, so that the measurement matching piece can descend from the position above the liquid level of the liquid alkali metal in the alkali metal container to the position below the liquid level; and the vibration reduction part is arranged on the measurement lifting device and is used for reducing the vibration amplitude of the tension measurement part when the measurement lifting device drives the tension measurement part to lift. According to the measuring system provided by the embodiment of the invention, the vibration amplitude of the tension measuring piece during lifting can be reduced, and the accuracy of the density measuring result of the liquid metal can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of density of testing materials, and in particular to a system for measuring the density of liquid alkali metal. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] As a good heat transfer medium, liquid alkali metal can be widely used in chemical industry, metallurgy, energy, medicine and nuclear industry. The density of liquid alkali metal is an important parameter in the application process of liquid alkali metal. In order to make full and reasonable use of liquid alkali metal, it is necessary to measure the density of liquid alkali metal.

[0004] At present, when measuring the density of liquid, the density measurement is usually carried out by filling a spherical container with the liquid to be measured. However, for liquid alkali metals, since they are not wettable with the commonly used spherical container materials, when using a spherical container to measure the density of liquid alkali metals, it is easy for the spherical container to not be filled with liquid alkali metals, resulting in inaccurate measurement results of the density of liquid alkali metals. Summary of the invention

[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] In view of the above problems, an embodiment of the present application provides a system for measuring the density of liquid alkali metal (hereinafter referred to as the measurement system), which includes an alkali metal container, a heating device, a tension measuring piece, a measuring fitting, a measuring lifting device and a vibration damping piece. The alkali metal container is used to contain liquid alkali metal; the heating device is used to provide heat to the alkali metal container so that the liquid alkali metal in the alkali metal container is at a preset temperature; the measuring fitting is suspended on the tension measuring piece so that the tension on the measuring fitting is measured by the tension measuring piece; the measuring lifting device is configured to drive the tension measuring piece and the measuring fitting to rise and fall relative to the alkali metal container so that the measuring fitting can descend from above the liquid surface of the liquid alkali metal in the alkali metal container to below the liquid surface, thereby determining the density of the liquid alkali metal according to the change in tension measured by the tension measuring piece; the vibration damping piece is provided on the measuring lifting device to reduce the vibration amplitude of the tension measuring piece caused by the tension measuring piece when the measuring lifting device drives the tension measuring piece to rise and fall.

[0007] The measurement system provided in the embodiment of the present application measures the change in tension of the measuring fitting during the process of descending from above the liquid surface of the liquid alkali metal to below the liquid surface through a tension measuring piece, so as to determine the density of the liquid alkali metal based on the change in tension measured by the tension measuring piece; since a vibration damping piece is provided, the vibration amplitude of the tension measuring piece caused by the tension measuring piece when the measuring lifting device drives the tension measuring piece to rise and fall can be reduced, which can improve the accuracy of the measurement result of the tension measuring piece, and further helps to improve the accuracy of the measurement result of the density of the liquid metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.

[0009] Figure 1 It is a schematic diagram of the structure of a system for measuring the density of liquid alkali metal provided in an embodiment of the present application.

[0010] Figure 2 It is a schematic structural diagram of a measuring lifting device of a system for measuring the density of liquid alkali metal provided in an embodiment of the present application.

[0011] Figure 3 It is a cross-sectional view of the composition of the system for measuring the density of liquid alkali metal provided by an embodiment of the present application after omitting the measuring lifting device and the glove box.

[0012] Description of reference numerals:

[0013] 100. Measurement system;

[0014] 10. Alkali metal containers;

[0015] 20. Heating device; 21. Outer shell; 211. Top cover; 22. Inner shell; 23. Shell connector; 231. Connecting cylinder; 232. Connecting flange; 24. Cooling assembly; 241. First cooling element; 2411. First cooling cavity; 242. Second cooling element; 2421. Second cooling cavity; 201. Heating cavity; 202. Inlet and outlet passage;

[0016] 30. Tensile force measuring parts;

[0017] 40. Measure the mating parts;

[0018] 50. Measuring lifting device; 51. Moving part; 52. Moving matching part; 53. Container lifting device; 531. Moving part; 532. Moving matching part;

[0019] 60. Vibration-damping member; 61. Steel plate; 62. Reinforcement member;

[0020] 70. Support plate;

[0021] 80. glove box; 81. bottom wall; 82. opening;

[0022] 90, baffle; 91, main body; 92, edge; 93, through hole;

[0023] 101, flexible thin wire; 103, connecting pipe; 106, temperature measuring device; 108, computer;

[0024] 11. Sealing member; 111. Cover member; 112. Connecting member; 12. Sealing fitting member; 121. Bellows; 122. Connecting fitting member; 123. Bottom wall connecting member; 124. Sealing ring;

[0025] 200. Cooling water system; 300. Inert gas source; 310. Gas pipeline.

[0026] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0027] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0028] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0029] See also Figure 1 and Figure 2The embodiment of the present application provides a system for measuring the density of liquid alkali metal (hereinafter referred to as the measurement system 100), which may include an alkali metal container 10, a heating device 20, a tension measuring piece 30, a measuring fitting piece 40, and a measuring lifting device 50. The alkali metal container 10 is used to contain liquid alkali metal; the heating device 20 is used to provide heat to the alkali metal container 10 so that the liquid alkali metal in the alkali metal container 10 is at a preset temperature; the measuring fitting piece 40 is suspended on the tension measuring piece 30 so that the tension on the measuring fitting piece 40 is measured by the tension measuring piece 30; the measuring lifting device 50 is configured to drive the tension measuring piece 30 and the measuring fitting piece 40 to rise and fall relative to the alkali metal container 10 so that the measuring fitting piece 40 can be lowered from above the liquid surface of the liquid alkali metal in the alkali metal container 10 to below the liquid surface, thereby determining the density of the liquid alkali metal according to the change in tension measured by the tension measuring piece 30.

[0030] The measuring system 100 provided in the embodiment of the present application measures the change in tension during the process of the measuring fitting 40 descending from above the liquid surface of the liquid alkali metal to below the liquid surface through the tension measuring piece 30, so as to determine the density of the liquid alkali metal according to the change in tension measured by the tension measuring piece 30. The inventor of the present application found that the measurement result of the density of the liquid alkali metal measured by the measuring system 100 still has the problem of inaccuracy. The inventor of the present application found through experiments that the measuring lifting device 50 will have a small vibration when driving the tension measuring piece 30 and the measuring fitting 40 to rise and fall, and the existence of the small vibration makes the tension measured by the tension measuring piece 30 not accurate enough, and thus the measured density is not accurate enough.

[0031] Therefore, in the embodiment of the present application, the measuring system 100 further includes a vibration damping member 60, which is disposed on the measuring lifting device 50 and is used to reduce the vibration amplitude of the tension measuring member 30 caused when the measuring lifting device 50 drives the tension measuring member 30 to rise and fall. Since the vibration damping member 60 can reduce the vibration amplitude of the tension measuring member 30 when it is lifted and fallen, the accuracy of the measurement result of the tension measuring member 30 is improved, and thus the accuracy of the measurement result of the density of the liquid metal is also improved.

[0032] See also Figure 3 In some embodiments, the measuring fitting 40 may be suspended on the tension measuring member 30 via a flexible thin line 101. In some embodiments, the tension measuring member 30 may be a balance.

[0033] In some embodiments, the alkali metal container 10 may be a crucible. In some embodiments, the alkali metal container 10 may be made of nickel.

[0034] In some embodiments, the volume V2 of the fitting 40 and the change F of the tension measured by the tension measuring member 30 can be measured. ΔAnd the temperature T2 of the liquid alkali metal when the density is measured, determine the density ρ of the liquid alkali metal.

[0035] Specifically, the volume V2 of the fitting 40 and the change F of the tension measured by the tension measuring member 30 are measured. Δ , the temperature T2 of the liquid alkali metal when measuring the density and the density ρ of the liquid alkali metal satisfy the following relationship:

[0036]

[0037] F Δ =F1-F2,

[0038] V2=V0(1+α(T2-T1)).

[0039] In the above expression, g represents the acceleration of gravity; F1 represents the tension measured by the tension measuring part 30 when the measuring fitting 40 is above the liquid surface of the liquid alkali metal; F2 represents the tension measured by the tension measuring part 30 when the measuring fitting 40 is below the liquid surface of the liquid alkali metal; V0 represents the volume of the measuring fitting 40 calibrated with deionized water at room temperature; T1 represents the temperature of the deionized water when calibrating the measuring fitting 40; α represents the volume thermal expansion coefficient of the measuring fitting 40 at T2; wherein, the volume thermal expansion coefficient α of the measuring fitting 40 at T2 can be determined by searching for data.

[0040] See also Figure 3 In some embodiments, the vibration damping member 60 may include a plurality of steel plates 61 arranged in a vertically overlapping manner. In such an embodiment, the plurality of steel plates 61 are equivalent to forming a counterweight, so that the vibration damping member 60 can reduce the vibration amplitude of the tension measuring member 30 when it is lifted or lowered. The weight of the plurality of steel plates 61 may be, for example, 20 kg.

[0041] In some embodiments, the measurement system 100 may further include a support plate 70, the support plate 70 is disposed on the vibration damping member 60, and the tension measuring member 30 is disposed on the support plate 70. The center of gravity of the support plate 70 and the tension measuring member 30 may be located on the plurality of steel plates 61, or a vertical line passing through the center of gravity of the support plate 70 and the tension measuring member 30 passes through the plurality of steel plates 61, so that the vibration damping member 60 is conducive to reducing the vibration amplitude of the tension measuring member 30 when it is lifted or lowered.

[0042] In some embodiments, the support plate 70 is formed with through holes for the flexible wire 101 to pass through.

[0043] See also Figure 3In some embodiments, the vibration damping member 60 may further include a reinforcing member 62 for reinforcing the plurality of steel plates 61. In such an embodiment, since the plurality of steel plates 61 are heavy, reinforcing the plurality of steel plates 61 by the reinforcing member 62 is conducive to improving the stability of the plurality of steel plates 61.

[0044] In some embodiments, the reinforcement member 62 is, for example, a triangular steel plate, and two right-angled sides of the triangular steel plate are respectively connected to the plurality of steel plates 61 and the moving member 51 to reinforce the plurality of steel plates 61 .

[0045] See also Figure 3 In some embodiments, the measuring lifting device 50 may include a moving member 51, a moving matching member 52, and a driving member. The moving member 51 is connected to the vibration-damping member 60, and the driving member drives the moving member 51 to move vertically relative to the moving matching member 52, so as to drive the vibration-damping member 60 and the support plate 70 to move up and down, thereby driving the measuring matching member 40 to enter or leave the heating chamber 201.

[0046] In some embodiments, the measurement fitting 40 may be a metal block with a smooth surface. In some embodiments, the material of the measurement fitting 40 may be a material that is not corroded by alkali metals, such as stainless steel or molybdenum.

[0047] In some embodiments, the measuring fitting 40 may be made of a material that is not wettable with the liquid alkali metal. Since the material of the measuring fitting 40 is not wettable with the liquid alkali metal, in such an embodiment, the surface tension of the liquid alkali metal can be prevented from affecting the change in the tension measured by the tension measuring member 30, thereby facilitating the accuracy of the measurement result of the density of the liquid alkali metal. In some embodiments, the material of the measuring fitting 40 may be nickel.

[0048] See also Figure 2 In some embodiments, the heating device 20 may form a heating chamber 201 and an inlet and outlet passage 202 communicating with the heating chamber 201. In some embodiments, the measuring system 100 may further include a container lifting device 53 for driving the alkali metal container 10 to enter or leave the heating chamber 201 through the inlet and outlet passage 202. In such an embodiment, the alkali metal container 10 is driven to enter or leave the heating chamber 201 by the container lifting device 53, so that the alkali metal container 10 can be heated by the heating device 20 and the alkali metal container 10 can be cleaned at the same time.

[0049] In some embodiments, the container lifting device 53 and the measuring lifting device 50 are arranged in the glove box 80, and the bottom wall 81 of the glove box 80 forms an opening 82; the heating chamber 201 is arranged below the glove box 80, and the inlet and outlet channel 202 is connected to the glove box 80 through the opening 82.

[0050] In an embodiment of the present application, the glove box 80 can provide an inert gas environment for the density measurement of the liquid alkali metal. Since liquid alkali metals such as liquid sodium, liquid potassium, etc. can react with water, oxygen, carbon dioxide, etc. to generate substances such as oxides and carbonates, these substances will form a layer of film-like structure on the surface of the liquid alkali metal in the form of an amorphous multiphase solid, affecting the accuracy of the measurement result of the density of the liquid alkali metal. In an embodiment of the present application, an inert gas environment is provided for the density measurement of the liquid alkali metal by the glove box 80, which can avoid the reaction of the liquid alkali metal with water, oxygen, carbon dioxide, etc., and is conducive to improving the accuracy of the measurement result of the density of the liquid alkali metal.

[0051] In some embodiments, the glove box 80 may use an inert gas as a protective gas, such as argon. Figure 1 In some embodiments, the external inert gas source 300 is connected to the glove box 80 through a gas pipeline 310 to allow the external inert gas to enter the glove box 80; wherein, the inert gas source 300 can be an inert gas bottle, such as an argon gas bottle.

[0052] In some embodiments, the container lifting device 53 may include a moving member 531, a moving matching member 532 and a driving member. The moving member 531 is connected to the alkali metal container 10, and the driving member drives the moving member 531 to move vertically relative to the moving matching member 532 to drive the alkali metal container 10 to move up and down.

[0053] In some embodiments, the measuring lifting device 50 may be disposed on the moving part 531 .

[0054] See also Figure 2 In some embodiments, the measurement system 100 may further include a seal 11 and a seal fitting 12. The seal 11 is connected to the container lifting device 53, and the alkali metal container 10 is connected to the seal 11. The seal fitting 12 is disposed in the glove box 80. When the container lifting device 53 drives the alkali metal container 10 to move downward to enter the heating chamber 201, the seal 11 can be sealed with the seal fitting 12 to seal the heating chamber 201, so as to reduce the diffusion of alkali metal vapor into the glove box.

[0055] In some embodiments, the sealing member 11 includes a cover member 111 and a connector 112 disposed on the periphery of the cover member 111. The sealing fitting 12 includes: a bellows 121, a connector fitting 122, and a sealing ring 124. The bellows 121 is disposed in the glove box 80 and is sealed and connected to the periphery of the opening 82. The sealing ring 124 is disposed on the connector fitting 122. The connector fitting 122 is disposed at the top of the bellows 121. When the container lifting device 53 drives the alkali metal container 10 to move downward to enter the heating chamber 201, the connector 112 can compress the bellows 121 and seal the connector fitting 122. In such an embodiment, in the process of the container lifting device 53 driving the alkali metal container 10 to move downward to enter the heating chamber 201, the connector 112 can first contact with the connector fitting 122 and compress the bellows 121 until the alkali metal container 10 descends to the measuring position. The connection piece 112 and the connection fitting piece 122 are subjected to the force of the bellows 121 and the force applied by the container lifting device 53, which is more conducive to the sealing between the two. In addition, since there is a certain distance between the connection piece 112 and the connection fitting piece 122 and the bottom wall 81 of the glove box 80 (at least a distance greater than the length of the bellows 121 after compression), it is more conducive to clamping the connection piece 112 and the connection fitting piece 122 using a clamping device such as a clamp, thereby further strengthening the sealing between the two and further reducing the leakage of alkali metal.

[0056] The connector 112 and the connector fitting 122 may be quick-release flanges, such as KF flanges. During operation, the cover 111 and the bellows 121 can be separated by only touching the KF flange connection between the connector 112 and the connector fitting 122, which is easy to operate.

[0057] In some embodiments, the measuring system 100 further includes a connecting pipe 103, and the alkali metal container 10 is connected to the cover 111 through the connecting pipe 103. The connecting pipe 103 enters or leaves the heating chamber 201 through the inlet and outlet channel 202. The measuring fitting 40 enters the heating chamber 201 through the connecting pipe 103. In such an embodiment, the alkali metal container 10 is connected to the container lifting device 53 through the cover 111 and the connecting pipe 103, which is conducive to improving the stability of the alkali metal container 10 during the lifting process driven by the container lifting device 53.

[0058] In some embodiments, the flexible thin wire 101 may be located radially inside the connecting pipe 103. In some embodiments, the measuring system 100 may further include a container connector, the alkali metal container 10 is disposed on the container connector, and the container connector is connected to the connecting pipe 103; the container lifting device 53 can drive the connecting pipe 103 to move, and then can drive the container connector and the alkali metal container 10 to move, so that the alkali metal container 10 can enter or leave the heating chamber 201 through the heating channel. In some embodiments, the container connector can be a frame structure capable of accommodating a cup-shaped container, such as a basket.

[0059] See also Figure 2 In some embodiments, a bottom wall connector 123 is formed at one end of the bellows 121 facing the bottom wall 81 of the glove box 80, and the bellows 121 is connected to the bottom wall 81 through the bottom wall connector 123. In some embodiments, the bellows 121 is also sealed and connected to the periphery of the opening 82 of the glove box 80 through the bottom wall connector 123. The bottom wall connector 123 may be, for example, a flange.

[0060] See also Figure 2 In some embodiments, the measuring system 100 may further include a multi-layer baffle 90, which is disposed at intervals on the connecting pipe 103 along the extension direction of the connecting pipe 103 to reduce the diffusion of alkali metal vapor to the outside. In some embodiments, the number of layers of the multi-layer baffle 90 may be 4 to 6, for example, 4.

[0061] See also Figure 2 In some embodiments, the baffle 90 may include a main body 91 located radially inward, and the main body 91 extends obliquely downward from the connecting pipe 103 toward the radial outer side. The arrangement of the main body 91 extending obliquely downward from the connecting pipe 103 toward the radial outer side is conducive to the steam entering the connecting pipe 103 and the alkali metal vapor after condensation dripping downward.

[0062] See also Figure 2 In some embodiments, the baffle 90 may further include an edge portion 92, which extends vertically downward from the radially outer end of the main body 91. In such an embodiment, the edge portion 92 extending vertically downward from the radially outer end of the main body 91 is conducive to preventing the alkali metal vapor entering the baffle 90 from flowing upward along the gap between the baffle 90 and the inlet and outlet channel 202, thereby facilitating the reduction of the vapor pressure in the heating chamber 201, thereby reducing the vaporization of the alkali metal during the measurement process.

[0063] See also Figure 2In some embodiments, the measuring system 100 may further include a temperature measuring component 106 disposed on the cover 111 for measuring the temperature of the liquid alkali metal in the alkali metal container 10. The heating device 20 may adjust the heating power according to the temperature measured by the temperature measuring component 106 so that the liquid alkali metal in the alkali metal container 10 is at the measuring temperature.

[0064] The temperature measuring element 106 may be, for example, a thermocouple. In some embodiments, the temperature measuring element 106 may extend from the cover 111 to near the liquid surface of the liquid alkali metal to measure the temperature of the liquid alkali metal.

[0065] See also Figure 2 In some embodiments, a through hole 93 is formed at a position corresponding to the multi-layer baffle 90 for the temperature measuring element 106 to pass through. When the temperature measuring element 106 passes through the through hole 93, it does not contact the baffle 90, so as to avoid the baffle 90 affecting the measurement result of the temperature measuring element 106 and ensure the temperature measurement accuracy of the temperature measuring element 106.

[0066] See also Figure 2 In some embodiments, the temperature measuring component 106 is set on the cover 111 through fasteners. When the container lifting device 53 drives the connecting cylinder 231 to move, the cover 111 moves with the connecting cylinder 231, and the temperature measuring component 106 can move with the cover 111 through the fasteners.

[0067] See also Figure 2 In some embodiments, the heating device 20 may include an outer shell 21, an inner shell 22, a heating element, and a shell connector 23. The inner shell 22 is disposed in the outer shell 21, and the inner shell 22 forms a heating chamber 201. The heating element is disposed in the outer shell 21, and is used to heat the inner shell 22; the shell connector 23 is disposed outside the outer shell 21, and the shell connector 23 is connected to the inner shell 22, and the shell connector 23 forms an inlet and outlet channel 202, and the shell connector 23 is also sealed and connected to the periphery of the opening 82 of the glove box 80. By providing the shell connector 23, the inner shell 22 and the glove box 80 are connected, which is conducive to improving the sealing of the heating chamber 201.

[0068] The inventor of the present application has found that since the shell connector 23 is connected to the inner shell 22, the temperature is relatively high, which will increase the temperature of the bottom wall 81 of the glove box 80 connected to the shell connector 23, thereby adversely affecting the sealing of the glove box 80. Therefore, in some embodiments, the measurement system 100 further includes a cooling component 24 for cooling the shell connector 23. In the embodiment of the present application, the cooling component 24 is provided to cool the shell connector 23, thereby preventing the bottom wall 81 of the glove box 80 from being too high and adversely affecting the sealing of the glove box 80.

[0069] See also Figure 2In some embodiments, the shell connector 23 may include a connecting cylinder 231 and a connecting flange 232. The connecting flange 232 is arranged at one end of the connecting cylinder 231 away from the heating chamber 201. The connecting cylinder 231 is connected to the inner shell 22, and the connecting flange 232 is sealed and connected to the periphery of the opening 82 of the glove box 80.

[0070] In some embodiments, the cooling assembly 24 may include a first cooling member 241 sleeved on the connecting cylinder 231, for cooling the connecting cylinder 231. The first cooling member 241 forms a first cooling cavity 2411, which is connected to the external cooling water system 200, and the connecting cylinder 231 is cooled by circulating cooling water of the cooling water system 200 through the first cooling cavity 2411.

[0071] The inventors of the present application discovered that, since the inner shell 22 is connected to the top cover 211 of the outer shell 21 , the heat of the inner shell 22 is transferred to the top cover 211 , and then transferred to the bottom wall 81 of the glove box 80 in the form of heat radiation.

[0072] To address this problem, in some embodiments, the cooling assembly 24 may further include a second cooling member 242, which is located below the first cooling member 241 and sleeved on the connecting cylinder member 231, and is used to cool the connecting cylinder member 231 and the top cover 211 of the housing 21. The second cooling member 242 forms a second cooling cavity 2421, which is also connected to the external cooling water system 200, and cools the top cover 211 of the housing 21 and the connecting cylinder member 231 by circulating the cooling water of the cooling water system 200 through the second cooling cavity 2421.

[0073] In some embodiments, the second cooling cavity 2421 substantially covers the top cover 211 of the outer shell 21 to prevent the heat of the heating cavity 201 from being transferred to the bottom wall 81 of the glove box 80 in the form of heat radiation. In the embodiment of the present application, the first cooling member 241 and the second cooling member 242 are provided, which greatly reduces the heat transfer from the inner shell 22 to the bottom wall 81 of the glove box 80.

[0074] In some embodiments, the height of the lowermost baffle 90 among the plurality of baffles 90 is lower than the top cover 211, and the height of at least one baffle among the plurality of baffles 90 may be higher than the top cover 211, so as to be located radially inside the cooling assembly 24. In such an embodiment, the lower baffle 90 is conducive to heat preservation of the heating chamber 201, and the upper baffle 90 is conducive to liquefying the alkali metal vapor by using the cold provided by the cooling assembly 24. Since the main body 91 extends downwardly and obliquely from the connecting pipe 103 toward the radial outside, it is conducive to guiding the steam into the connecting pipe 103, maintaining the temperature in the connecting pipe 103, and avoiding the condensation of the alkali metal vapor on the flexible thin wire 101, which increases the tension measured by the tension measuring member 30, thereby reducing the error of the measured tension.

[0075] In some embodiments, the heating device 20 may further include a thermal insulation layer, which is disposed between the outer shell 21 and the inner shell 22 and is used to insulate the inner shell 22, and the heating element may be disposed in the thermal insulation layer. In some embodiments, the thermal insulation layer may include a top thermal insulation layer, a bottom thermal insulation layer, a side thermal insulation layer, and an external thermal insulation layer. The top thermal insulation layer and the side thermal insulation layer are disposed radially outward of the inner shell 22, and the side thermal insulation layer may be connected to the top thermal insulation layer and the bottom thermal insulation layer; the external thermal insulation layer is disposed radially outward of the top thermal insulation layer, the bottom thermal insulation layer, and the side thermal insulation layer, and is used to connect the top thermal insulation layer, the bottom thermal insulation layer, and the side thermal insulation layer.

[0076] In some embodiments, the heating device 20 may further include a radial cooling member, which is disposed radially outside the heat-insulating layer and is used to make the temperature of the heating chamber 201 uniform. In such an embodiment, the temperature of the heating chamber 201 is made uniform by the radial cooling member, so as to avoid the increase of the tension measured by the tension measuring member 30 due to the condensation of the alkali metal vapor on the flexible fine wire 101, thereby reducing the error of the measured tension.

[0077] In some embodiments, the radial cooling member can be used to make the temperature difference of each part of the heating chamber 201 not exceed 1°C. In some embodiments, the radial cooling member forms an annular cooling chamber, and a spirally extending coil is arranged in the annular cooling chamber. The coil is connected to the external cooling water system 200. The cooling water of the cooling water system 200 flows in the coil to exchange heat with the heating chamber 201, so that the temperature of the heating chamber 201 is uniform.

[0078] In some embodiments, the measurement system 100 may also include an electrical measurement system for automated control and recording of density measurements. Figure 1In some embodiments, the electrical measurement system may include a computer 108, which can control the container lifting device 53 and the measuring lifting device 50 to achieve automatic lifting of the two; the computer 108 can also control the heating element to achieve controllable heating and constant temperature heating of the heating element; the computer 108 can also record the temperature measured by the temperature measuring element 106 and the tension measured by the tension measuring element 30, and calculate the density of the alkali metal.

[0079] The following describes a process of measuring the density of liquid sodium using the measurement system 100 provided in an embodiment of the present application.

[0080] First, the volume of the measuring fitting 40 is calibrated at room temperature using deionized water of known density. Then, the mode of the glove box 80 is set to a circulation purification mode. When the water oxygen content in the glove box 80 is less than or equal to 1 μL / L, the density of the liquid sodium is measured.

[0081] Afterwards, the computer 108 controls the container lifting device 53 to drive the alkali metal container 10 from the inlet and outlet channel 202 to leave the heating chamber 201, and the solid metallic sodium sample is loaded into the alkali metal container 10, ensuring that the liquid sodium formed after the added solid metallic sodium is melted can immerse the measuring fitting 40; the alkali metal container 10 containing the solid metallic sodium sample is placed on the container connector.

[0082] Afterwards, the computer 108 controls the container lifting device 53 to allow the alkali metal container 10 to enter the heating chamber 201 through the inlet and outlet channel 202, and the heating chamber 201 is sealed by the sealing member 11; external cooling water enters each cooling member to cool the heating chamber 201 and the shell connector 23.

[0083] Afterwards, the heating element is controlled by the computer 108, the heating rate of the heating chamber 201 is set to 2-5°C / min, and the constant temperature heating time is set to 120min; after the constant temperature heating is completed, the measuring lifting device 50 is used to drive the measuring fitting 40 to descend so as to gradually immerse it in the liquid sodium until the measuring fitting 40 is completely immersed in the liquid sodium. Finally, the density of the liquid sodium is determined by the computer 108 according to the change in tension measured by the balance 30, the temperature of the liquid sodium, and the volume of the measuring fitting 40.

[0084] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0085] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A system for measuring the density of a liquid alkali metal, characterized in that: include: an alkali metal container for containing liquid alkali metal; A heating device, used to provide heat to the alkali metal container so that the liquid alkali metal in the alkali metal container is at a preset temperature; A tension measuring piece and a measuring matching piece, wherein the measuring matching piece is suspended on the tension measuring piece so that the tension on which the measuring matching piece is subjected can be measured by the tension measuring piece; a measuring lifting device, configured to drive the tension measuring member and the measuring matching member to rise and fall relative to the alkali metal container, so that the measuring matching member can be lowered from above the liquid surface of the liquid alkali metal in the alkali metal container to below the liquid surface, thereby determining the density of the liquid alkali metal according to the change of tension measured by the tension measuring member; The vibration-damping member is arranged on the measuring lifting device, and is used to reduce the vibration amplitude of the tension measuring member caused by the measuring lifting device driving the tension measuring member to rise and fall.

2. The system according to claim 1, characterized in that The vibration damping member comprises a plurality of steel plates arranged in a vertically overlapping manner; The system further comprises: a support plate, which is arranged on the vibration damping member, and the tension measuring member is arranged on the support plate; Wherein, the center of gravity of the support plate and the tension measuring piece is located on the multiple steel plates.

3. The system according to claim 2, characterized in that The vibration damping member further comprises a reinforcing member for supporting the plurality of steel plates.

4. The system according to claim 1, characterized in that The heating device forms a heating chamber and an inlet and outlet passage communicating with the heating chamber; The system further comprises: A container lifting device, used for driving the alkali metal container to enter the heating chamber or leave the heating chamber through the entry and exit passage; The container lifting device and the measuring lifting device are arranged in a glove box, and an opening is formed on the bottom wall of the glove box; The heating chamber is arranged below the glove box, and the inlet and outlet passage is communicated with the glove box through the opening.

5. The system according to claim 4, characterized in that Also includes: a sealing member, the sealing member being connected to the container lifting device, and the alkali metal container being connected to the sealing member; A sealing fitting is arranged in the glove box. When the container lifting device drives the alkali metal container to move downward to enter the heating chamber, the sealing fitting can be sealingly matched with the sealing fitting to seal the heating chamber.

6. The system according to claim 5, characterized in that The sealing member comprises a cover member and a connecting member arranged at the periphery of the cover member; The sealing fitting comprises: A bellows, disposed in the glove box and sealedly connected to the periphery of the opening; A connecting fitting and a sealing ring arranged on the connecting fitting, wherein the connecting fitting is arranged at the top end of the bellows, and when the container lifting device drives the sealing member to move downward to enter the heating chamber, the connecting member can compress the bellows and seal the connecting fitting.

7. The system according to claim 6, characterized in that Also includes: A connecting pipe, the alkali metal container is connected to the cover through the connecting pipe, the connecting pipe enters the heating chamber or leaves the heating chamber through the inlet and outlet passage, and the measuring fitting enters the heating chamber through the connecting pipe; The multi-layer baffles are arranged on the connecting pipe at intervals along the extending direction of the connecting pipe, and are used to reduce the diffusion of alkali metal vapor to the outside.

8. The system according to claim 7, characterized in that The blocking piece includes a main body portion located at the radial inner side, and the main body portion extends obliquely downward from the connecting pipe member toward the radial outer side.

9. The system according to claim 8, characterized in that The blocking piece further includes an edge portion, and the edge portion vertically extends downward from a radially outer end portion of the main body portion.

10. The system according to claim 8, characterized in that The heating device comprises: shell; An inner shell is disposed in the outer shell, and the inner shell forms the heating chamber; A heating element, disposed in the outer shell, for heating the inner shell; A shell connector, disposed outside the outer shell, connected to the inner shell, forming the inlet and outlet passage, and further sealed to the periphery of the opening of the glove box; A cooling component is arranged outside the shell and is used to cool the shell connector.

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