Static evaporation rate testing device of vacuum storage tank

Abstract

The invention provides a static evaporation rate testing device of a vacuum storage tank, and relates to the technical field of flow testing, the static evaporation rate testing device comprises a data processor, and a rewarming device, a gas buffer tube and a vent nozzle which are connected in sequence; a first pressure sensor, a thermometer and a mass flow meter are connected between the rewarming device and the gas buffer pipe; the rewarming device is connected with a gas phase space at the upper part of the vacuum storage tank; the gas buffer pipe is connected with a purging gas interface; the first pressure sensor is used for detecting the pressure of the gas heated by the rewarming device; the thermometer is used for detecting the temperature of the gas heated by the rewarming device; the mass flow meter is used for detecting the mass flow of the gas heated by the rewarming device; the data processor is electrically connected with the first pressure sensor, the thermometer and the mass flow meter, and the data processor is used for calculating the static evaporation rate of the vacuum storage tank. The rewarming device is added, low-temperature gas is heated to the suitable temperature of the mass flow meter, and measurement failure or damage of the mass flow meter is avoided.

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~120K as the cryogenic zone, and the main media are liquid nitrogen, liquid oxygen, liquid helium, etc. The temperature range of 4K~77K is called the ultra-cold zone, and the main media are liquid hydrogen, liquid helium, etc. Compared with liquid oxygen, liquid nitrogen, and liquid argon, the temperature difference between liquid hydrogen and liquid helium and the ambient temperature is large, and 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 gasify.

[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 and development and design of vacuum storage tanks.

[0005] At present, the static evaporation rate test method of the vacuum storage tank is roughly as follows: fill the vacuum storage tank with liquid hydrogen and liquid helium, close all valves except the venting valve, and let it stand for 48 hours; after the standing is completed, measure and record the gas mass flow rate 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 to connect the flow meter and the vacuum tank for direct measurement. However, the gas temperature in the test tube is very low (taking liquid hydrogen as an example, its boiling point is −252.87°C). Once the gas temperature is lower than the operating temperature requirement of the flow meter, the flow meter measurement will fail or be damaged. In addition, the measurement data needs to be manually converted and calculated before the evaporation rate result can be obtained, which needs to be improved. Summary of the invention

[0007] In view of the above situation, the present invention provides a static evaporation rate testing device for a vacuum storage tank, aiming 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 measurement will fail 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: The present invention provides a static evaporation rate test 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; The reheater is connected to the gas phase space at the upper part of 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 at the upper part of 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.

[0009] 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; The housing has a flow measurement inlet and a flow measurement outlet on opposite sides thereof; One end of the elbow is connected to the flow measurement inlet, and the other end is connected to the flow measurement outlet; A vibration driver is used to vibrate the bent pipe; The detector is used to detect the phase time difference of vibration at both ends of the bent pipe.

[0010] In some embodiments of the present invention, the gas phase space at the upper part of the vacuum storage tank is connected to the first pressure sensor through a rewarming pipe and a connecting pipe which are arranged in sequence; the rewarming pipe passes through a rewarmer.

[0011] In some embodiments of the present invention, the rewarmer comprises: get off your seat; 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 which runs horizontally through the upper cover and the lower seat. The reheating pipe can pass through the through hole. The upper infrared heating mechanism comprises 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; The lower infrared heating mechanism comprises 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 re-temperature pipe; 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.

[0012] In some embodiments of the present invention, the lower infrared heating mechanism further comprises: A lower bearing plate, on which the lower infrared heating head is arranged; the left end of the lower bearing plate is provided with a left extension rod, and the right end is provided with a right extension rod; the left side of the lower seat is provided with a left arc groove, and the right side is provided with a right arc groove, and the left arc groove and the right arc groove are coaxial with the through hole; the left extension rod slides through the left arc groove, and the right extension rod slides through the right arc groove; 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.

[0013] In some embodiments of the present invention, the lower infrared heating mechanism further comprises: 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 provided with a plurality of transmission teeth; the arc-shaped plate is coaxial with the through hole; Drive motor; The transmission gear is installed at the output end of the driving motor and meshes with the transmission teeth.

[0014] In some embodiments of the present invention, the lower infrared heating mechanism further comprises: 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; A spherical portion is arranged on the right extension rod, and the spherical portion can be in sliding contact with the surface of the protrusion; The spring is used for returning the left extension rod and the right extension rod to the right.

[0015] In some embodiments of the present invention, the upper infrared heating mechanism further comprises: An upper bearing plate, the left end of which slides through the left side of the upper cover, and an upper infrared heating head is arranged on the upper bearing plate; A connecting piece is used to connect the left end of the upper bearing plate and the left extension rod.

[0016] In some embodiments of the present invention, the left end of the connecting tube is plugged into the right end of the rewarming tube, the inner wall of the rewarming tube has an annular groove, and a sealing member is disposed in the annular groove.

[0017] In some embodiments of the present invention, 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, and 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 arranged 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 arranged in the first air inlet; The first exhaust port is provided with a one-way pressure relief valve.

[0018] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 paying any creative work.

[0020] Figure 1 It is a schematic diagram of the composition of a static evaporation rate test device for a vacuum storage tank; Figure 2 It is a schematic diagram of the structure of the rewarmer, the first pressure sensor, the thermometer and the mass flow meter; Figure 3 for Figure 2 A partial enlarged view of position A in the middle; Figure 4 It is a structural schematic diagram of the arc plate and the transmission gear; Figure 5 It is a schematic structural diagram of a plurality of protrusions arranged on the right inner wall of the lower seat along the circumference of the through hole, and a right arc-shaped groove passing through the protrusions; Figure 6 for Figure 2 Schematic diagram of the structure with the middle connecting piece along the left side.

[0021] icon: 1-data processor, 2-mass flow meter, 3-gas buffer tube, 4-vent, 6-first pressure sensor, 7-thermometer, 8-rewarmer, 9-second pressure sensor, 10-flow regulating valve, 11-purge gas interface, 12-vent valve, 13-rewarming tube, 14-connecting tube, 21-housing, 211-flow measurement inlet, 212-flow measurement outlet, 22-elbow, 23-vibration driver, 24-detector, 81-lower seat, 811-through hole, 812-left arc groove, 813-right arc groove, 83-upper cover, 84-upper infrared heating mechanism, 841-upper bearing plate, 842-connecting piece, 843-limiting nut, 844-movable plate, 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, 151 - annular groove, 152 - air bag, 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

[0022] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can realize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0023] 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.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0026] The embodiments of the present invention are described in detail below.

[0027] Example 1

[0028] See also Figure 1~Figure 2The present embodiment provides a static evaporation rate testing device for a vacuum storage tank, comprising a data processor 1, and a rewarmer 8, a gas buffer tube 3 and a vent 4 connected in sequence, wherein a first pressure sensor 6, a thermometer 7 and a mass flow meter 2 are connected in sequence between the rewarmer 8 and the gas buffer tube 3.

[0029] 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 liquid such as liquid hydrogen is filled in the vacuum storage tank (not full), due to the gasification of part of the liquid hydrogen, a gas phase space is formed at the upper part of the vacuum storage tank and a liquid phase space is formed at the lower part, and 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.

[0030] The reheater 8 is connected to the gas phase discharge port of the vacuum storage tank to heat the gas discharged from the gas phase discharge port to a specified temperature, which is within the working temperature range of the mass flow meter 2. A second pressure sensor 9 and a flow regulating valve 10 are connected in sequence between the pressure stabilizing discharge port and the gas buffer pipe 3.

[0031] The gas buffer tube 3 plays a buffering role. The gas buffer tube 3 is connected to a purge gas interface 11, and the purge gas interface 11 is used to connect a gas source to purge and clean the pipeline of the entire test device.

[0032] 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.

[0033] The first pressure sensor 6 is used to detect the pressure of the gas after being heated by the reheater 8 .

[0034] The thermometer 7 is used to detect the temperature of the gas after being heated by the reheater 8.

[0035] The mass flow meter 2 is used to detect the mass flow of the gas after being heated by the reheater 8 .

[0036] The data processor 1 is electrically connected to the first pressure sensor 6 , the thermometer 7 and the mass flow meter 2 , respectively.

[0037] The mass flow meter 2 includes a housing 21 , and a curved pipe 22 , a vibration driver 23 , and a detector 24 located in the housing 21 .

[0038] The housing 21 has a flow measurement inlet 211 and a flow measurement outlet 212 on opposite sides thereof.

[0039] 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. The elbow 22 has two (due to viewing angle, 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 to the two elbows 22, and the gas in the two elbows 22 converges to the flow measurement outlet 212.

[0040] The vibration driver 23 is used to vibrate the bent pipe 22 .

[0041] The detector 24 is used to detect the phase time difference of vibration at both ends of the curved pipe 22 .

[0042] The vibration driver 23 makes the elbow 22 vibrate. In order to resist the forced vibration, the gas will give the elbow 22 a reaction force, which is called the Coriolis effect force. Under the action of this force called the Coriolis effect, the vibrations at both ends of the elbow 22 are not synchronized, and there will be a difference in the timing of the vibrations at both ends of the elbow 22, which is called the phase time difference. This difference is related to the mass flow of the gas flowing through the pipe, and can be calculated according to the corresponding formula.

[0043] When using the static evaporation rate test device of the vacuum storage tank, the following steps are included (other steps not mentioned can be operated by referring to the existing method): Step S1, connect the purge gas interface 11 to blow away the air and impurities in the entire test device to avoid medium contamination and explosion hazards; Step S2, connecting the pressure-stabilizing discharge port and the gas buffer pipe 3, controlling the gas flow rate discharged from the pressure-stabilizing discharge port by adjusting the opening of the flow regulating valve 10, and detecting the pressure by the second pressure sensor 9; 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 tank, which may cause danger; In combination with the above content, 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 to the applicable temperature (working temperature) of the mass flowmeter 2 by the rewarmer 8, it is measured by the first pressure sensor 6, the thermometer 7, and the mass flowmeter 2, and the pressure, temperature, and flow test values ​​are transmitted to the data processor 1. After the data processor 1 performs data calculation to obtain the static evaporation rate of the vacuum storage tank, the static evaporation rate is displayed and stored.

[0044] It can be seen from the above that this embodiment has at least the following beneficial effects compared with the existing method: 1. A reheater 8 is added, which can heat the low-temperature gas to the applicable temperature (working temperature) of the mass flow meter 2 to avoid measurement failure or damage of the mass flow meter 2. In other words, this embodiment has lower requirements for the mass flow meter 2.

[0045] 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.

[0046] Example 2

[0047] This embodiment is a further improvement made on the basis of Embodiment 1.

[0048] 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.

[0049] The mass flow meter 2 is a resonant sensor. When there is a temperature gradient at both ends of the vibrating curved pipe 22, there will be a difference in the natural vibration frequency at both ends of the curved pipe 22, thereby causing a measurement error.

[0050] Example 3

[0051] This embodiment is a further improvement made on the basis of Embodiment 1 or 2.

[0052] See also Figure 1 to Figure 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.

[0053] 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 .

[0054] 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 retemperature pipe 13 is smaller than the diameter of the through hole 811, and the retemperature pipe 13 can pass through the through hole 811.

[0055] 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 rewarming tube 13 ( Figure 2 The left and right directions as shown) are arranged in intervals in the upper cover 83.

[0056] 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 rewarming tube 13 ( Figure 2 The left and right directions as shown) are spaced apart in the lower seat 81.

[0057] 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 direction of the through hole 811 .

[0058] 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.

[0059] 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 heat multiple positions of the tubular component evenly, in this embodiment, the upper infrared heating mechanism 84 and the lower infrared heating mechanism 85 should not adopt a spiral heating structure.

[0060] 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. On the one hand, it is convenient to disassemble and assemble the rewarming tube 13 and the rewarmer 8; on the other hand, it is possible to expand the area of ​​the rewarming tube 13 irradiated by infrared rays while ensuring uniform heating of multiple positions of the rewarming tube 13 (equivalent to realizing the function of the spiral heating structure), so as to avoid local overheating of the rewarming tube 13 due to fixed and continuous heating of the fixed point in the infrared irradiation area; under the influence of thermal expansion and contraction, if the rewarming tube 13 is locally overheated, it will affect the stress of the connection between the rewarming tube 13 and the connecting tube 14, and then affect the elbow 22 of the mass flowmeter 2, so that the forces at both ends of the elbow 22 are 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 flow meter 2 to have measurement distortion and large errors.

[0061] In order to make the lower infrared heating mechanism 85 reciprocate around the axis of the through hole 811 , the lower infrared heating mechanism 85 further includes a lower bearing plate 852 and a rotating rod 853 .

[0062] 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.

[0063] 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.

[0064] 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 reciprocate and swing), thereby causing the lower infrared heating mechanism 85 to rotate back and forth around the axis of the through hole 811.

[0065] 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 .

[0066] The inner side of the arc 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 plate 856 ; the arc plate 856 is coaxial with the through hole 811 .

[0067] The transmission gear 857 is installed at the output end of the driving motor 858 and meshes with the transmission gear.

[0068] When the driving motor 858 rotates forward and reverse, the transmission gear 857 and the arc plate 856 drive the rotating rod 853 to reciprocate a certain angle, thereby driving the lower supporting plate 852 and the lower infrared heating head 851 to reciprocate through the rotating rod 853.

[0069] When installing the drive motor 858, appropriate damping measures can be taken to prevent excessive vibration during motor operation from being transmitted to the rewarming pipe 13. By leaving a certain distance between the rewarming pipe 13 and the through hole 811, excessive vibration during motor operation can also be prevented from being transmitted to the rewarming pipe 13.

[0070] 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 .

[0071] A plurality of protrusions 859 are arranged on the right inner wall of the lower seat 81 along the circumferential direction of the through hole 811 , the right arc-shaped groove 813 penetrates the protrusions 859 , and the right extension rod 855 can slide through each protrusion 859 .

[0072] The spherical portion 861 is disposed on the right extension rod 855 , and the spherical portion 861 can be in sliding contact with the surface of the protrusion 859 .

[0073] 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.

[0074] When the rotating rod 853 rotates back and forth, it drives the right extension rod 855 and the spherical portion 861 to rotate around the axis of the through hole 811, and the spherical portion 861 will intermittently slide in contact with each protrusion 859, and the spherical portion 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 portion 861 moving toward the top of the protrusion 859, the spherical portion 861, the right extension rod 855 and the left extension rod 854 will move to the left together; in the process of the spherical portion 861 moving from the top to the bottom of the protrusion 859, the spherical portion 861, the right extension rod 855 and the left extension rod 854 will move to the right together and reset under the action of the restoring force of the spring 862, thereby causing the lower infrared heating mechanism 85 to reciprocate along the axial direction of the through hole 811.

[0075] 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 rewarming 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 as the gas when it moves to the left); in order to ensure the consistency of the gas temperature after being heated by the rewarming tube 13, the rotation speed of the motor output end can be appropriately adjusted according to the flow rate of the gas in the rewarming tube 13 when the drive motor 858 rotates forward or reversely, so as to shorten the time the lower infrared heating mechanism 85 moves to the right (or extend the time the lower infrared heating mechanism 85 moves to the left) to compensate for the slight difference in the above-mentioned heating time, so that the heating time of the gas in the rewarming tube 13 is consistent when the lower infrared heating mechanism 85 moves to the left and to the right, thereby reducing unnecessary variables.

[0076] 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 .

[0077] 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 arranged on the upper bearing plate 841; The connecting member 842 is used to connect the left end of the upper bearing plate 841 and the left extension rod 854, so as to drive the upper bearing plate 841 to reciprocate around the axis of the through hole 811 and reciprocate along the axis direction of the through hole 811 through the left extension rod 854. More specifically, the left end of the upper bearing plate 841 and the left extension rod 854 are both connected with a plurality of limit nuts 843, and the position of the connecting member 842 is limited by the cooperation of the plurality of limit nuts 843. The spring 862 is a tension spring, one end of which is connected with the movable plate 844 and the other end is connected with the connecting member 842, and the movable plate 844 is slidably connected with the left side of the lower seat 81. In this way, the upper bearing plate 841 can be driven to reciprocate around the axis of the through hole 811 and reciprocate along the axis direction of the through hole 811 through the left extension rod 854.

[0078] Example 4

[0079] This embodiment is a further improvement made on the basis of Embodiment 3.

[0080] In the prior art, pipes are generally connected by flange connection, which is a static sealing connection method.

[0081] See also Figure 1 to Figure 6 In order to further reduce the influence of the expansion of the rewarming tube 13 when heated on the mass flow meter 2, the static seal between the rewarming tube 13 and the connecting tube 14 is improved to a dynamic seal. Specifically: The left end of the connecting tube 14 is plugged into the right end of the rewarming tube 13, and the inner wall of the rewarming tube 13 has an annular groove 151, and a sealing member is arranged in the annular groove 151. In this way, when the rewarming tube 13 moves rightward by a certain amplitude due to deformation, a relative displacement can be generated between the rewarming tube 13 and the connecting tube 14, so as to reduce the influence on the mass flow meter 2.

[0082] In this embodiment, the sealing member includes an airbag 152. However, even a completely closed airbag 152 will inevitably leak after being used for a period of time, resulting in a decrease in sealing performance.

[0083] 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 rotatably sleeved on the outer wall of the rotating rod 853 .

[0084] The piston 155 is slidably connected to the inner wall of the rotating rod 853, and the rotating rod 853 is provided with 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).

[0085] The adapter sleeve 156 has a cavity 159 inside, and the cavity 159 is communicated with the second exhaust port 158 ​​.

[0086] The first air inlet 153 is connected to the interior of the adapter sleeve 156 through the telescopic hose 161. A first one-way air inlet valve (not shown in the figure) is arranged in the first air inlet 153.

[0087] The first exhaust port 154 is provided with a one-way pressure relief valve (not shown in the figure).

[0088] As can be seen from the above, the piston 155 can move left and right along with the right extension rod 855. In the process of the piston 155 moving left and right along with the right extension rod 855, it can move along Figure 3The path indicated by the arrow is used to inflate the airbag 152 in one direction, so that even if there is air leakage in the airbag 152, it can be automatically inflated during each test to ensure the sealing 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, the air 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.

[0089] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. In the absence of conflicts, the embodiments of the present application and the features in the embodiments may be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope 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 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; The reheater is connected to the gas phase space at the upper part of 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 at the upper part of 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 the data processor is used to calculate the static evaporation rate of the vacuum storage tank.

2. The static evaporation rate testing device of a vacuum storage tank according to claim 1, characterized in that: The mass flow meter includes a housing, and a bend pipe, a vibration driver and a detector located in the housing; The housing has a flow measurement inlet and a flow measurement outlet on opposite sides; One end of the elbow 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 bent pipe; The detector is used to detect the phase time difference of vibration at both ends of the bent pipe.

3. The static evaporation rate testing device of the vacuum storage tank according to claim 2, characterized in that: The gas phase space at the upper part of the vacuum storage tank is connected to the first pressure sensor through a rewarming pipe and a connecting pipe which are arranged in sequence; the rewarming pipe passes through the rewarmer.

4. The static evaporation rate testing device of a vacuum storage tank according to claim 3, characterized in that: 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 which runs 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, a plurality of which 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, a plurality of which are arranged in the lower seat at intervals along the length direction of the re-temperature pipe; 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.

5. The static evaporation rate testing device of the vacuum storage tank according to claim 4, characterized in that: The lower infrared heating mechanism also includes: A lower bearing plate, the lower infrared heating head is arranged on the lower bearing plate; the left end of the lower bearing 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 groove, and the right side has a right arc groove, and the left arc groove and the right arc groove are coaxial with the through hole; the left extension rod slides through the left arc groove, and the right extension rod slides through the right arc groove; 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.

6. The static evaporation rate testing device of the vacuum storage tank according to claim 5, 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 gear.

7. The static evaporation rate testing device of a vacuum storage tank according to claim 5, characterized in that: The lower infrared heating mechanism also includes: 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 of the protrusions; a spherical portion, disposed on the right extension rod, wherein the spherical portion can be in sliding contact with 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.

8. The static evaporation rate testing device of a vacuum storage tank according to claim 7, 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 piece is used to connect the left end of the upper bearing plate and the left extension rod.

9. The static evaporation rate testing device for a vacuum storage tank according to any one of claims 5 to 8, 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 arranged in the annular groove.

10. The static evaporation rate testing device of a vacuum storage tank according to claim 9, 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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