A static evaporation rate testing device for a vacuum storage tank

Abstract

The present invention provides a static evaporation rate testing device for a vacuum storage tank, relating to the field of flow rate testing technology. The device comprises: a data processor, and, in sequence, a rewarmer, a gas buffer tube, and a vent; a first pressure sensor, a thermometer, and a mass flowmeter are connected between the rewarmer and the gas buffer tube; the rewarmer is connected to the gas phase space above the vacuum storage tank; the gas buffer tube is connected to a purge gas interface; the first pressure sensor is used to detect the pressure of the gas after being heated by the rewarmer; the thermometer is used to detect the temperature of the gas after being heated by the rewarmer; and the mass flowmeter is used to detect the mass flow rate of the gas after being heated by the rewarmer; the data processor is electrically connected to the first pressure sensor, the thermometer, and the mass flowmeter, respectively, and is used to calculate the static evaporation rate of the vacuum storage tank. The addition of the rewarmer heats the low-temperature gas to a temperature suitable for the mass flowmeter to prevent measurement failure or damage to the mass flowmeter.

Description

Technical Field

[0001] The invention relates to the technical field of flow rate testing, in particular to a static evaporation rate testing device for a vacuum storage tank. Background Art

[0002] As one of the main performance indicators of vacuum storage tanks, the static evaporation rate index can well reflect the insulation performance of vacuum storage tanks. Vacuum storage tanks with low static evaporation rates can improve the utilization rate of cryogenic liquids, reduce the evaporation and gasification losses of ultra-cold liquids, and improve economic benefits.

[0003] The industry generally refers to the temperature range of 77K to 120K as the cryogenic zone, where liquid nitrogen, liquid oxygen, and liquid helium are the primary media. The temperature range of 4K to 77K is called the ultra-cold zone, where liquid hydrogen and liquid helium are the primary media. Compared to liquid oxygen, liquid nitrogen, and liquid argon, the temperature difference between liquid hydrogen and liquid helium and the ambient temperature is significantly greater. The same amount of heat transferred from the outside into the storage tank is more likely to cause the liquid hydrogen and liquid helium to vaporize.

[0004] Liquid hydrogen and liquid helium have high economic value, and improving their utilization rate has become one of the goals pursued by vacuum storage tanks. Therefore, it is necessary to accurately measure the static evaporation rate of vacuum storage tanks to assist in the research, development and design of vacuum storage tanks.

[0005] At present, the static evaporation rate test method of a vacuum storage tank is roughly as follows: fill the vacuum storage tank with liquid hydrogen and liquid helium, close all valves except the vent valve, and let it stand for 48 hours; after the standing time is completed, measure and record the mass flow rate of the gas vented in the next 24 hours, and calculate the static daily evaporation rate within 24 hours.

[0006] The existing measurement method uses a test tube connected to the flowmeter and a vacuum storage tank for direct measurement. However, the gas temperature in the test tube is very low (for example, liquid hydrogen has a boiling point of −252.87°C). Once the gas temperature falls below the flowmeter's operating temperature, the flowmeter will fail or even be damaged. Furthermore, the measurement data requires manual conversion and calculation to determine the evaporation rate, which requires improvement. Summary of the Invention

[0007] In response to the above situation, the present invention provides a static evaporation rate testing device for a vacuum storage tank, which aims to solve the problem that the existing measurement method uses a test tube to connect the flow meter and the vacuum storage tank for direct measurement. However, the gas temperature in the test tube is very low. Once the gas temperature is lower than the operating temperature requirement of the flow meter, the flow meter will fail to measure or be damaged. In addition, the measurement data needs to be manually converted and calculated before the evaporation rate result can be obtained, which is a technical problem that needs to be improved.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention provides a static evaporation rate testing device for a vacuum storage tank, comprising: a data processor, and a rewarmer, a gas buffer tube, and a vent connected in sequence; a first pressure sensor, a thermometer, and a mass flow meter are connected between the rewarmer and the gas buffer tube;

[0010] The reheater is connected to the gas phase space above the vacuum storage tank to heat the gas to a specified temperature, which is within the operating temperature range of the mass flow meter;

[0011] The gas buffer tube is connected to a purge gas interface; a second pressure sensor and a flow regulating valve are connected between the gas buffer tube and the gas phase space above the vacuum storage tank;

[0012] The first pressure sensor is used to detect the pressure of the gas after being heated by the reheater;

[0013] The thermometer is used to detect the temperature of the gas after being heated by the reheater;

[0014] The mass flow meter is used to detect the mass flow of the gas after being heated by the reheater;

[0015] The data processor is electrically connected to the first pressure sensor, the thermometer and the mass flow meter respectively, and is used to calculate the static evaporation rate of the vacuum storage tank.

[0016] In some embodiments of the present invention, a mass flow meter includes a housing, and an elbow, a vibration driver, and a detector located within the housing;

[0017] The housing has a flow measurement inlet and a flow measurement outlet on opposite sides;

[0018] One end of the elbow is connected to the flow measurement inlet, and the other end is connected to the flow measurement outlet;

[0019] A vibration driver is used to vibrate the bent pipe;

[0020] The detector is used to detect the phase time difference of vibration at both ends of the bent pipe.

[0021] In some embodiments of the present invention, the gas phase space above the vacuum storage tank is connected to the first pressure sensor via a rewarming pipe and a connecting pipe that are sequentially arranged; the rewarming pipe passes through a rewarmer.

[0022] In some embodiments of the present invention, the rewarmer comprises:

[0023] get off your seat;

[0024] The upper cover is detachably connected to the top of the lower seat. After the upper cover and the lower seat are connected, a through hole is formed that runs horizontally through the upper cover and the lower seat. The reheating pipe can pass through the through hole.

[0025] The upper infrared heating mechanism includes an upper infrared heating head, and a plurality of upper infrared heating heads are arranged in the upper cover at intervals along the length direction of the rewarming tube;

[0026] The lower infrared heating mechanism includes a lower infrared heating head, and a plurality of lower infrared heating heads are arranged in the lower seat at intervals along the length direction of the reheating tube;

[0027] Wherein, both the upper infrared heating mechanism and the lower infrared heating mechanism can rotate around the axis of the through hole, and reciprocate along the axis direction of the through hole.

[0028] In some embodiments of the present invention, the lower infrared heating mechanism further comprises:

[0029] A lower bearing plate, with the lower infrared heating head arranged on the lower bearing plate; a left extension rod is provided at the left end of the lower bearing plate, and a right extension rod is provided at the right end; a left arc-shaped groove is provided on the left side of the lower seat, and a right arc-shaped groove is provided on the right side, and the left arc-shaped groove and the right arc-shaped groove are coaxial with the through hole; the left extension rod slides through the left arc-shaped groove, and the right extension rod slides through the right arc-shaped groove;

[0030] The left end of the rotating rod is slidably connected to the right side of the lower seat; the right extension rod extends into the rotating rod and is slidably connected to the rotating rod; the rotating rod can drive the right extension rod to rotate.

[0031] In some embodiments of the present invention, the lower infrared heating mechanism further comprises:

[0032] The inner side of the arc-shaped plate is fixedly connected to the rotating rod, and the outer side of the arc-shaped plate is distributed with a plurality of transmission teeth; the arc-shaped plate is coaxial with the through hole;

[0033] Drive motor;

[0034] The transmission gear is installed at the output end of the drive motor and meshes with the transmission teeth.

[0035] In some embodiments of the present invention, the lower infrared heating mechanism further comprises:

[0036] A plurality of protrusions are arranged on the right inner wall of the lower seat along the circumference of the through hole, the right arc-shaped groove passes through the protrusions, and the right extension rod can slide through each protrusion;

[0037] a spherical portion, disposed on the right extension rod, the spherical portion being capable of slidingly contacting the surface of the protrusion;

[0038] The spring is used to move the left extension rod and the right extension rod to the right and reset them.

[0039] In some embodiments of the present invention, the upper infrared heating mechanism further comprises:

[0040] An upper bearing plate, the left end of which slides through the left side of the upper cover, and the upper infrared heating head is arranged on the upper bearing plate;

[0041] A connecting piece is used to connect the left end of the upper bearing plate and the left extension rod.

[0042] In some embodiments of the present invention, the left end of the connecting tube is plugged into the right end of the rewarming tube, and the inner wall of the rewarming tube has an annular groove, in which a sealing member is provided.

[0043] In some embodiments of the present invention, the sealing member includes an airbag; the sealing member has a first air inlet and a first air outlet, the right end of the right extension rod is connected to a piston, and the outer wall of the rotating rod is provided with an adapter sleeve;

[0044] The piston is slidably connected to the inner wall of the rotating rod; the rotating rod is provided with a second air inlet and a second air outlet; a second one-way air inlet valve is provided in the second air inlet;

[0045] The adapter sleeve has a cavity inside, and the cavity is communicated with the second exhaust port;

[0046] The first air inlet is connected to the interior of the adapter sleeve through a telescopic hose; a first one-way air inlet valve is provided in the first air inlet;

[0047] The first exhaust port is provided with a one-way pressure relief valve.

[0048] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 This is a schematic diagram of the composition of a static evaporation rate test device for a vacuum storage tank;

[0051] Figure 2 It is a structural diagram of the rewarmer, the first pressure sensor, the thermometer and the mass flow meter;

[0052] Figure 3 for Figure 2 A partial enlarged view of position A in the middle;

[0053] Figure 4 Schematic diagram of the structure of the arc plate and the transmission gear;

[0054] Figure 5 A schematic diagram of a structure in which a plurality of protrusions are arranged on the right inner wall of the lower seat along the circumference of the through hole, and a right arc-shaped groove passes through the protrusions;

[0055] Figure 6 for Figure 2 Schematic diagram of the structure with the middle connecting piece along the left side.

[0056] icon:

[0057] 1-data processor, 2-mass flow meter, 3-gas buffer tube, 4-vent, 6-first pressure sensor, 7-thermometer, 8-reheater, 9-second pressure sensor, 10-flow regulating valve, 11-purge gas interface, 12-vent valve, 13-reheating tube, 14-connecting tube,

[0058] 21-housing, 211-flow measurement inlet, 212-flow measurement outlet, 22-elbow, 23-vibration driver, 24-detector,

[0059] 81-lower seat, 811-through hole, 812-left arc groove, 813-right arc groove, 83-upper cover,

[0060] 84-upper infrared heating mechanism, 841-upper bearing plate, 842-connector, 843-limiting nut, 844-movable plate,

[0061] 85-lower infrared heating mechanism, 851-lower infrared heating head, 852-lower bearing plate, 853-rotating rod, 854-left extension rod, 855-right extension rod, 856-arc plate, 857-transmission gear, 858-drive motor, 859-protrusion, 861-spherical part, 862-spring,

[0062] 151 - annular groove, 152 - airbag, 153 - first air inlet, 154 - first exhaust port, 155 - piston, 156 - adapter sleeve, 157 - second air inlet, 158 - second exhaust port, 159 - cavity, 161 - telescopic hose. DETAILED DESCRIPTION

[0063] In the following, only certain exemplary embodiments are briefly described. As those skilled in the art would realize, the described embodiments may be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0064] In the description of the embodiments of the present invention, it should be understood that the terms "lateral", "length", "up", "down", "left", "right", "top", "bottom", "inside", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0066] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0067] The embodiments of the present invention are described in detail below.

[0068] Example 1

[0069] See also Figure 1~Figure 2 This embodiment provides a static evaporation rate testing device for a vacuum storage tank, including a data processor 1, and a rewarmer 8, a gas buffer tube 3, and a vent 4 connected in sequence. A first pressure sensor 6, a thermometer 7, and a mass flowmeter 2 are connected in sequence between the rewarmer 8 and the gas buffer tube 3.

[0070] The vacuum storage tank (not shown in the figure) has a gas phase discharge port and a pressure-stabilizing discharge port. After ultra-low temperature liquids such as liquid hydrogen are filled into the vacuum storage tank (not full), part of the liquid hydrogen vaporizes, forming a gas phase space at the upper part of the vacuum storage tank and a liquid phase space at the lower part. The gas phase discharge port and the pressure-stabilizing discharge port are both connected to the gas phase space at the upper part of the vacuum storage tank.

[0071] A reheater 8 is connected to the gas phase exhaust port of the vacuum storage tank to heat the gas discharged from the gas phase exhaust port to a specified temperature within the operating temperature range of the mass flowmeter 2. A second pressure sensor 9 and a flow control valve 10 are connected in sequence between the pressure stabilization exhaust port and the gas buffer tube 3.

[0072] The gas buffer tube 3 plays a buffering role. The gas buffer tube 3 is connected to a purge gas interface 11, which is used to connect to a gas source to purge and clean the pipeline of the entire test device.

[0073] The vent port 4 is provided with a vent valve 12, and the vent port 4 is used to discharge the gas in the vacuum storage tank.

[0074] The first pressure sensor 6 is used to detect the pressure of the gas after being heated by the rewarmer 8 .

[0075] The thermometer 7 is used to detect the temperature of the gas after being heated by the reheater 8.

[0076] The mass flow meter 2 is used to detect the mass flow of the gas after being heated by the reheater 8.

[0077] The data processor 1 is electrically connected to the first pressure sensor 6 , the thermometer 7 and the mass flow meter 2 respectively.

[0078] The mass flowmeter 2 includes a housing 21 , and a bent pipe 22 , a vibration driver 23 , and a detector 24 located in the housing 21 .

[0079] The housing 21 has a flow measurement inlet 211 and a flow measurement outlet 212 on opposite sides thereof.

[0080] One end of the elbow 22 is connected to the flow measurement inlet 211, and the other end is connected to the flow measurement outlet 212. Figure 2 Only one elbow 22 is shown, and the other elbow 22 overlaps with it. The gas is divided from the flow measurement inlet 211 into the two elbows 22, and the gas in the two elbows 22 converges into the flow measurement outlet 212.

[0081] The vibration driver 23 is used to vibrate the bent pipe 22 .

[0082] The detector 24 is used to detect the phase time difference between the two ends of the curved pipe 22 .

[0083] Vibration driver 23 vibrates curved pipe 22. To counteract this forced vibration, the gas exerts a reaction force on the curved pipe 22, known as the Coriolis effect. This force causes the vibrations at both ends of curved pipe 22 to become out of sync, resulting in a difference in the timing of the vibrations at both ends, known as the phase time difference. This difference is related to the mass flow rate of the gas flowing through the pipe and can be calculated using the corresponding formula.

[0084] When using the static evaporation rate test device of the vacuum storage tank, the following steps are included (other steps not mentioned can refer to the existing method):

[0085] Step S1, connect the purge gas interface 11 to blow out the air and impurities in the entire test device to avoid medium contamination and explosion hazards;

[0086] Step S2: Connect the pressure-stabilizing discharge port and the gas buffer pipe 3, control the gas flow rate discharged from the pressure-stabilizing discharge port by adjusting the opening of the flow regulating valve 10, and detect the pressure through the second pressure sensor 9;

[0087] Step S3: When the second pressure sensor 9 displays 0, the gas phase exhaust port and the rewarmer 8 are connected to prevent local overpressure during the test due to pressure fluctuations in the vacuum storage tank, which may cause danger;

[0088] In light of the above, after the gas phase exhaust port and the rewarmer 8 are connected, the temperature of the gas discharged from the gas phase exhaust port is very low. After the gas temperature is raised by the rewarmer 8 to the applicable temperature (operating temperature) of the mass flowmeter 2, it is measured by the first pressure sensor 6, the thermometer 7, and the mass flowmeter 2. The pressure, temperature, and flow test values are transmitted to the data processor 1. After the data processor 1 performs data calculations to obtain the static evaporation rate of the vacuum storage tank, the static evaporation rate is displayed and stored.

[0089] As can be seen from the above, this embodiment has at least the following beneficial effects compared to the existing method:

[0090] 1. A reheater 8 is added. The reheater 8 can heat the low-temperature gas to the applicable temperature (working temperature) of the mass flowmeter 2 to avoid measurement failure or damage of the mass flowmeter 2. In other words, this embodiment has lower requirements for the mass flowmeter 2.

[0091] Second, a data processor 1 is added, so that the static evaporation rate result can be quickly obtained without manual conversion and calculation of the measured data.

[0092] Example 2

[0093] This embodiment is a further improvement made on the basis of embodiment 1.

[0094] See also Figure 1~Figure 2 In this embodiment, the interior of the shell 21 of the mass flowmeter 2 is a vacuum environment, so that the shell 21 has a good thermal insulation effect to avoid a temperature gradient at both ends of the elbow 22, that is, the gas temperature at both ends of the elbow 22 can be made consistent, which helps to ensure detection accuracy.

[0095] The aforementioned mass flowmeter 2 is a resonant sensor. When there is a temperature gradient at both ends of the vibrating elbow 22, the natural vibration frequencies at both ends of the elbow 22 will differ, thereby causing measurement errors.

[0096] Example 3

[0097] This embodiment is a further improvement made on the basis of embodiment 1 or 2.

[0098] See also Figures 1 to 6 The gas phase exhaust port is connected to the first pressure sensor 6 through a retemperature pipe 13 and a connecting pipe 14 which are arranged in sequence.

[0099] The rewarmer 8 includes a lower seat 81 , an upper cover 83 , an upper infrared heating mechanism 84 and a lower infrared heating mechanism 85 .

[0100] The upper cover 83 is detachably connected to the top of the lower seat 81 by means of hinges or the like. After the upper cover 83 and the lower seat 81 are connected, a through hole 811 is formed which passes horizontally through the upper cover 83 and the lower seat 81. The outer diameter of the reheating tube 13 is smaller than the diameter of the through hole 811, and the reheating tube 13 can pass through the through hole 811.

[0101] The upper infrared heating mechanism 84 includes an upper infrared heating head, and a plurality of upper infrared heating heads are arranged along the length direction of the reheating tube 13 ( Figure 2 The left and right directions shown in the figure are arranged in intervals in the upper cover 83.

[0102] The lower infrared heating mechanism 85 includes a lower infrared heating head 851, and a plurality of lower infrared heating heads 851 are arranged along the length direction of the reheating tube 13 ( Figure 2 The left and right directions shown in the figure are spaced apart and arranged in the lower seat 81.

[0103] The upper infrared heating mechanism 84 and the lower infrared heating mechanism 85 are both capable of rotating around the axis of the through hole 811 and reciprocating along the axis of the through hole 811 .

[0104] When assembling the rewarmer 8 and the rewarming tube 13, first fix the lower seat 81 of the rewarmer 8 on the operating table (not shown in the figure), open the upper cover 83, put the rewarming tube 13 in, and then close the upper cover 83 (at this time the rewarming tube 13 passes through the through hole 811), and heat multiple positions on the upper and lower sides of the rewarming tube 13 through the upper infrared heating mechanism 84 and the lower infrared heating mechanism 85.

[0105] Since the retemperature tube 13 needs to be installed in the upper cover 83 and the lower seat 81, the upper cover 83 and the lower seat 81 need to be designed to be detachable; although the spiral heating structure can evenly heat multiple positions of the tubular component, in this embodiment, the upper infrared heating mechanism 84 and the lower infrared heating mechanism 85 should not adopt a spiral heating structure.

[0106] In this embodiment, the upper infrared heating mechanism 84 and the lower infrared heating mechanism 85 are reciprocated along the axial direction of the through hole 811 and reciprocated around the axis of the through hole 811, which, on the one hand, facilitates the disassembly and assembly of the reheating tube 13 and the reheater 8; on the other hand, it can ensure that multiple positions of the reheating tube 13 are uniformly heated (equivalent to realizing the function of the spiral heating structure) while expanding the area of the reheating tube 13 irradiated by infrared rays, thereby avoiding the local overheating of the reheating tube 13 due to the fixed and continuous heating of the fixed point in the infrared irradiation area; under the influence of thermal expansion and contraction, if the reheating tube 13 is locally overheated, it will affect the stress of the connection between the reheating tube 13 and the connecting tube 14, and then affect the elbow 22 of the mass flowmeter 2, making the forces at both ends of the elbow 22 inconsistent (after the entire test device is assembled, the forces at both ends of the elbow 22 are consistent), which will mainly affect Figure 2 The vibration state of the left end of the middle elbow 22 causes the mass flowmeter 2 to have measurement distortion and large errors.

[0107] In order to enable the lower infrared heating mechanism 85 to reciprocate around the axis of the through hole 811 , the lower infrared heating mechanism 85 further includes a lower supporting plate 852 and a rotating rod 853 .

[0108] The lower infrared heating head 851 is arranged on the lower supporting plate 852; the left end of the lower supporting plate 852 has a left extension rod 854, and the right end has a right extension rod 855; the left side of the lower seat 81 has a left arc groove 812, and the right side has a right arc groove 813, and the left arc groove 812 and the right arc groove 813 are coaxial with the through hole 811; the left extension rod 854 slides through the left arc groove 812, and the right extension rod 855 slides through the right arc groove 813.

[0109] The left end of the rotating rod 853 is slidably connected to the right side of the lower seat 81. The right extension rod 855 extends into the rotating rod 853 and is slidably connected to the rotating rod 853. The rotating rod 853 can drive the right extension rod 855 to rotate. The cross-section of the right extension rod 855 can be polygonal so that the rotating rod 853 can drive the right extension rod 855 to rotate.

[0110] When the rotating rod 853 rotates back and forth, the right extension rod 855 rotates accordingly and drives the lower supporting plate 852 and the lower infrared heating head 851 to rotate back and forth (or reciprocatingly swing), thereby causing the lower infrared heating mechanism 85 to rotate back and forth around the axis of the through hole 811.

[0111] In order to facilitate the reciprocating rotation of the rotating rod 853, the lower infrared heating mechanism 85 also includes an arc plate 856, a transmission gear 857 and a driving motor 858.

[0112] The inner side of the arc-shaped plate 856 is fixedly connected to the rotating rod 853 , and a plurality of transmission teeth are distributed on the outer side of the arc-shaped plate 856 ; the arc-shaped plate 856 is coaxial with the through hole 811 .

[0113] The transmission gear 857 is mounted on the output end of the driving motor 858 and meshes with the transmission gear.

[0114] When the driving motor 858 rotates forward and reverse, the transmission gear 857 and the arc plate 856 drive the rotating rod 853 to rotate back and forth a certain angle, thereby driving the lower supporting plate 852 and the lower infrared heating head 851 to rotate back and forth through the rotating rod 853.

[0115] When installing the drive motor 858, appropriate vibration reduction measures can be taken to prevent excessive transmission of vibration from the motor to the rewarming pipe 13. By leaving a certain distance between the rewarming pipe 13 and the through hole 811, excessive transmission of vibration from the motor to the rewarming pipe 13 can also be prevented.

[0116] In order to enable the lower infrared heating mechanism 85 to reciprocate along the axial direction of the through hole 811 , the lower infrared heating mechanism 85 further includes a protrusion 859 , a spherical portion 861 and a spring 862 .

[0117] A plurality of protrusions 859 are arranged on the right inner wall of the lower seat 81 along the circumference of the through hole 811 . The right arcuate groove 813 passes through the protrusions 859 , and the right extension rod 855 can slide through each protrusion 859 .

[0118] The spherical portion 861 is provided on the right extension rod 855 , and the spherical portion 861 is capable of slidingly contacting the surface of the protrusion 859 .

[0119] The spring 862 is connected to the left extension rod 854 and is used to move the left extension rod 854 and the right extension rod 855 to the right and reset them.

[0120] When the rotating rod 853 rotates back and forth, it drives the right extension rod 855 and the spherical part 861 to rotate around the axis of the through hole 811. The spherical part 861 will intermittently slide in contact with each protrusion 859, and the spherical part 861 will move toward the top of the protrusion 859 or from the top to the bottom of the protrusion 859; in the process of the spherical part 861 moving toward the top of the protrusion 859, the spherical part 861, the right extension rod 855 and the left extension rod 854 will move to the left together; in the process of the spherical part 861 moving from the top to the bottom of the protrusion 859, the spherical part 861, the right extension rod 855 and the left extension rod 854 will move to the right together under the action of the restoring force of the spring 862 to reset, thereby causing the lower infrared heating mechanism 85 to move back and forth along the axis direction of the through hole 811.

[0121] See also Figure 2, under the influence of the gas flow rate (the gas moves to the right), there may be a slight difference in the time the gas is heated through the retemperature tube 13 when the lower infrared heating mechanism 85 moves to the right or to the left (the lower infrared heating mechanism 85 moves in the same direction as the gas when it moves to the right, and moves in the opposite direction to the gas when it moves to the left); in order to ensure the consistency of the gas temperature after being heated by the retemperature tube 13, the rotation speed of the motor output end can be appropriately adjusted according to the flow rate of the gas in the retemperature tube 13 when the drive motor 858 rotates forward or reverse, and the time the lower infrared heating mechanism 85 moves to the right (or the time the lower infrared heating mechanism 85 moves to the left) is shortened to compensate for the slight difference in the above-mentioned heating time, so that the heating time of the gas in the retemperature tube 13 when the lower infrared heating mechanism 85 moves to the left is consistent, thereby reducing unnecessary variables.

[0122] In order to enable the lower infrared heating mechanism 85 to reciprocate around the axis of the through hole 811 and to reciprocate along the axis of the through hole 811 , the upper infrared heating mechanism 84 further includes an upper supporting plate 841 and a connecting member 842 .

[0123] The left end of the upper bearing plate 841 slides through the left side of the upper cover 83, and the upper infrared heating head is set on the upper bearing plate 841;

[0124] Connecting member 842 is used to connect the left end of upper supporting plate 841 and left extension rod 854, thereby driving upper supporting plate 841 to rotate back and forth about the axis of through-hole 811 and to move back and forth along the axis of through-hole 811 via left extension rod 854. More specifically, multiple retaining nuts 843 are connected to the left end of upper supporting plate 841 and left extension rod 854, and the engagement of multiple retaining nuts 843 defines the position of connecting member 842. Spring 862 is a tension spring, one end of which is connected to movable plate 844 and the other end is connected to connecting member 842. Movable plate 844 is slidably connected to the left side of lower seat 81. In this way, the left extension rod 854 can drive upper supporting plate 841 to rotate back and forth about the axis of through-hole 811 and to move back and forth along the axis of through-hole 811.

[0125] Example 4

[0126] This embodiment is a further improvement based on the third embodiment.

[0127] In the prior art, pipes are generally connected by flange connection, which is a static sealing connection method.

[0128] See also Figures 1 to 6 In order to further reduce the impact of the expansion of the rewarming tube 13 when heated on the mass flowmeter 2, the static seal between the rewarming tube 13 and the connecting tube 14 is improved to a dynamic seal. Specifically:

[0129] The left end of the connecting tube 14 is plugged into the right end of the rewarming tube 13. The inner wall of the rewarming tube 13 has an annular groove 151, which contains a seal. This allows for relative displacement between the rewarming tube 13 and the connecting tube 14 when the rewarming tube 13 deforms and moves to the right a certain distance, minimizing the impact on the mass flowmeter 2.

[0130] In this embodiment, the sealing member includes an air bag 152. However, even a completely sealed air bag 152 will inevitably leak after a period of use, resulting in a decrease in sealing performance.

[0131] In order to ensure that the airbag 152 can perform a sealing function for a long time, the airbag 152 has a first air inlet 153 and a first air outlet 154. The right end of the right extension rod 855 is connected to a piston 155, and an adapter sleeve 156 is provided on the outer wall of the rotating rod 853.

[0132] The piston 155 is slidably connected to the inner wall of the rotating rod 853. The rotating rod 853 has a second air inlet 157 and a second air outlet 158. The second air inlet 157 is provided with a second one-way air inlet valve (not shown in the figure).

[0133] The adapter sleeve 156 defines a cavity 159 therein, and the cavity 159 is communicated with the second exhaust port 158 .

[0134] The first air inlet 153 is in communication with the interior of the adapter sleeve 156 via the telescopic hose 161. A first one-way air inlet valve (not shown) is disposed in the first air inlet 153.

[0135] The first exhaust port 154 is provided with a one-way pressure relief valve (not shown in the figure).

[0136] As can be seen from the above, the piston 155 can move left and right along with the right extension rod 855. Figure 3 The path indicated by the arrow inflates air into the airbag 152 in one direction. Thus, even if airbag 152 is leaking, it is automatically inflated during each test to ensure a tight seal between the rewarming tube 13 and the connecting tube 14. When the air pressure inside the airbag 152 reaches the set value of the one-way pressure relief valve, it is exhausted to prevent the relative movement between the rewarming tube 13 and the connecting tube 14 from being affected by excessive air pressure inside the airbag 152.

[0137] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. The embodiments and features of the embodiments of this application may be combined arbitrarily without conflict. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A static evaporation rate test device for a vacuum storage tank, characterized in that: include: A data processor, and, in sequence, a rewarmer, a gas buffer tube, and a vent; a first pressure sensor, a thermometer, and a mass flow meter are connected between the rewarmer and the gas buffer tube; The reheater is connected to the gas phase space above the vacuum storage tank to heat the gas to a specified temperature, which is within the operating temperature range of the mass flow meter; The gas buffer tube is connected to a purge gas interface; a second pressure sensor and a flow regulating valve are connected between the gas buffer tube and the gas phase space above the vacuum storage tank; The first pressure sensor is used to detect the pressure of the gas after being heated by the reheater; The thermometer is used to detect the temperature of the gas after being heated by the reheater; The mass flow meter is used to detect the mass flow of the gas after being heated by the reheater; The data processor is electrically connected to the first pressure sensor, the thermometer, and the mass flow meter, respectively, and is used to calculate the static evaporation rate of the vacuum storage tank; The mass flowmeter includes a housing, a curved pipe, a vibration driver, and a detector located within the housing; the housing has a flow measurement inlet and a flow measurement outlet on opposite sides; one end of the curved pipe is connected to the flow measurement inlet, and the other end is connected to the flow measurement outlet; the vibration driver is used to vibrate the curved pipe; The detector is used to detect the phase time difference of vibration at both ends of the bent pipe; The gas phase space above the vacuum storage tank is connected to the first pressure sensor via a retemperature pipe and a connecting pipe which are arranged in sequence; The rewarming pipe passes through the rewarmer; The rewarmer comprises: get off your seat; An upper cover is detachably connected to the top of the lower seat. After the upper cover and the lower seat are connected, a through hole is formed that passes through the upper cover and the lower seat transversely. The reheating pipe can pass through the through hole. An upper infrared heating mechanism, comprising an upper infrared heating head, wherein a plurality of upper infrared heating heads are arranged in the upper cover at intervals along the length direction of the rewarming tube; A lower infrared heating mechanism, comprising a lower infrared heating head, wherein a plurality of the lower infrared heating heads are arranged in the lower seat at intervals along the length direction of the retemperature tube; Wherein, the upper infrared heating mechanism and the lower infrared heating mechanism are both capable of rotating around the axis of the through hole, and reciprocating along the axis direction of the through hole; The lower infrared heating mechanism also includes: A lower supporting plate, wherein the lower infrared heating head is arranged on the lower supporting plate; the left end of the lower supporting plate has a left extension rod, and the right end has a right extension rod; the left side of the lower seat has a left arc-shaped groove, and the right side has a right arc-shaped groove, and the left arc-shaped groove and the right arc-shaped groove are coaxial with the through hole; the left extension rod slides through the left arc-shaped groove, and the right extension rod slides through the right arc-shaped groove; A rotating rod, the left end of which is slidably connected to the right side of the lower seat; the right extension rod extends into the rotating rod and is slidably connected to the rotating rod; the rotating rod can drive the right extension rod to rotate; a plurality of protrusions arranged on the right inner wall of the lower seat along the circumference of the through hole, the right arc-shaped groove passing through the protrusions, and the right extension rod being able to slide through each of the protrusions; a spherical portion, provided on the right extension rod, wherein the spherical portion is capable of slidingly contacting the surface of the protrusion; The spring is used to move the left extension rod and the right extension rod to the right and reset them.

2. The static evaporation rate testing device for a vacuum storage tank according to claim 1, characterized in that: The lower infrared heating mechanism also includes: An arc-shaped plate, the inner side of which is fixedly connected to the rotating rod, and a plurality of transmission teeth are distributed on the outer side of the arc-shaped plate; the arc-shaped plate is coaxial with the through hole; Drive motor; A transmission gear is installed at the output end of the driving motor and meshes with the transmission teeth.

3. The static evaporation rate testing device of a vacuum storage tank according to claim 1, characterized in that: The upper infrared heating mechanism also includes: An upper bearing plate, the left end of which slides through the left side of the upper cover, and the upper infrared heating head is arranged on the upper bearing plate; A connecting member is used to connect the left end of the upper bearing plate and the left extension rod.

4. The static evaporation rate testing device for a vacuum storage tank according to any one of claims 1 to 3, characterized in that: The left end of the connecting pipe is plugged into the right end of the rewarming pipe. The inner wall of the rewarming pipe is provided with an annular groove, and a sealing member is provided in the annular groove.

5. The static evaporation rate testing device for a vacuum storage tank according to claim 4, characterized in that: The sealing member includes an air bag; the sealing member has a first air inlet and a first air outlet; the right end of the right extension rod is connected to a piston; the outer wall of the rotating rod is provided with an adapter sleeve; The piston is slidably connected to the inner wall of the rotating rod; the rotating rod is provided with a second air inlet and a second air outlet; a second one-way air inlet valve is provided in the second air inlet; The adapter sleeve has a cavity inside, and the cavity is communicated with the second exhaust port; The first air inlet is connected to the interior of the adapter sleeve through a telescopic hose; a first one-way air inlet valve is provided in the first air inlet; The first exhaust port is provided with a one-way pressure relief valve.

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