CN217505706U - Test chamber for liquid nitrogen flow characteristic test of superconducting cable - Google Patents
Test chamber for liquid nitrogen flow characteristic test of superconducting cable Download PDFInfo
- Publication number
- CN217505706U CN217505706U CN202121483795.8U CN202121483795U CN217505706U CN 217505706 U CN217505706 U CN 217505706U CN 202121483795 U CN202121483795 U CN 202121483795U CN 217505706 U CN217505706 U CN 217505706U
- Authority
- CN
- China
- Prior art keywords
- test
- pipe
- liquid nitrogen
- test chamber
- supporting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The utility model provides a test chamber for experimental superconductive cable liquid nitrogen flow characteristic, includes vacuum cover, transition pipeline, test tube section, bearing structure, test bench, its characterized in that: a head interface flange and a tail interface flange are arranged at two ends of the vacuum cover, and a first hatch and a second hatch are arranged on the head interface flange, so that the transition pipeline enters the vacuum cover through the first hatch passing opening and passes out of the vacuum cover through the second hatch passing opening; the transition pipeline is hermetically connected with a first test pipe section and a second test pipe section, each test pipe section comprises a test corrugated pipe, and the first test pipe section and the second test pipe section are connected through a middle bent pipe; and pressure and temperature measuring points are arranged on the transition pipeline. The utility model discloses adjustable measurement when can realize many bellows to easy and simple to handle, measure accurate, the usage is various.
Description
Technical Field
The utility model relates to a superconductive transmission of electricity field, more specifically relates to a test chamber for superconductive cable liquid nitrogen flow characteristic is experimental.
Background
The application of superconducting technology in power systems is various, and is one of the main directions of research on superconducting application in recent years. Compared to power cables, superconducting cables have great advantages, such as: the power transmission capacity is strong, the cost is saved, the occupied space is small, the line impedance is extremely low, the power transmission loss is small, and the anti-magnetic interference capacity is strong; the method allows long-distance power transmission with relatively low voltage, and can also transmit power underground, thereby avoiding noise, electromagnetic pollution and potential safety hazard caused by ultrahigh-voltage high-altitude power transmission and protecting the ecological environment.
The transition Temperature of a High Temperature Superconducting (HTS) cable is usually above 77K. Currently, liquid nitrogen is generally employed as its suitable cooling medium. In addition, based on the characteristics and installation requirements of the HTS cable itself, vacuum multilayer insulated double-layer corrugated tubing is often used as a liquid nitrogen insulating jacket. The pressure loss and heat loss of the liquid nitrogen flowing inside the corrugated pipe are important parameters for designing the HTS cable cryogenic system, and can directly determine the selection of the cold quantity of the cryogenic refrigerator for maintaining the supercooled liquid nitrogen, the spacing distance between adjacent cryogenic stations, the cryogenic pump head and the like. However, the flow of liquid nitrogen in the bellows varies depending on the geometry of the inner wall surface of the bellows and the type of superconducting cable inserted into the bellows.
In the prior art, a method for testing the flowing characteristic of liquid nitrogen in a superconducting cable corrugated pipe is provided. For example, background document 1, CN104697739A, a device for measuring the flow resistance and temperature distribution of cryogenic fluid in heat-insulating bellows, 2015, 6/10/h, huang yonghua, and the like. Background document 2, experimental study of flow characteristics in bellows, sun phoenix jade et al, 10 months 2008, engineering thermophysics, vol 29, No. 10. However, in the prior art, the test chamber for the superconducting cable liquid nitrogen flow characteristic test is complex in operation, single in function, low in measurement precision and limited in measurement index.
Therefore, a test chamber for a liquid nitrogen flow characteristic test of a novel superconducting cable with accurate measurement and various usages is needed.
SUMMERY OF THE UTILITY MODEL
For solving the not enough that exists among the prior art, the utility model aims to provide a experimental test chamber of superconductive cable liquid nitrogen flow characteristic. The utility model provides a test chamber can realize the liquid nitrogen test that possesses the gradient based on the regulation to bearing structure height, and bearing structure based on special shape reduces the liquid nitrogen heat leak to the regulation based on preloading device supports the accurate test to multiple different specification bellows.
The utility model adopts the following technical proposal. The utility model provides a test chamber for experimental superconductive cable liquid nitrogen flow characteristic, includes vacuum cover, transition pipeline, test tube section, bearing structure, test bench, its characterized in that: a head interface flange and a tail interface flange are arranged at two ends of the vacuum cover, and a first hatch and a second hatch are arranged on the head interface flange so that the transition pipeline enters the vacuum cover through the first hatch passing opening and passes out of the vacuum cover through the second hatch passing opening; the transition pipeline is hermetically connected with a first test pipe section and a second test pipe section, each test pipe section comprises a corrugated pipe for testing, and the first test pipe section and the second test pipe section are connected through a middle bent pipe; and pressure and temperature measuring points are arranged on the transition pipeline.
Preferably, the test chamber further comprises a first support mechanism and a second support mechanism, and the first support mechanism and the second support mechanism are respectively arranged in the middle and the rear of the vacuum cover of the test chamber; and the height of the first and second supporting mechanisms is adjustable, and when the height of the first and second supporting mechanisms is adjusted, an adjustable angle is formed between the test chamber and the horizontal ground.
Preferably, the first support structure is located between the front section cylinder and the ground, the second support structure is located between the rear section cylinder and the ground, and the first support structure and the second support structure can respectively adjust the heights of the front section cylinder and the rear section cylinder.
Preferably, the first supporting structure is a worm and gear lifting structure, and the height of the front section cylinder is adjusted through the top support; the second supporting structure is a stud adjusting structure, and the height of the rear section cylinder is adjusted through a crescent supporting plate.
Preferably, the test chamber further comprises a third support structure, wherein the third support structure is a triangular support structure made of polytetrafluoroethylene and is located inside the test chamber and used for supporting the test tube section and the transition pipeline.
Preferably, the test cavity further comprises a first pre-tightening mechanism and a second pre-tightening mechanism, and the pre-tightening mechanism comprises a supporting rod, a limiting structure, a spring and a connecting piece; one end of the first pre-tightening mechanism is connected with the head interface flange, the other end of the first pre-tightening mechanism is fixed at one end of the corrugated pipe, one end of the second pre-tightening mechanism is connected with the tail interface flange, and the other end of the second pre-tightening mechanism is fixed at the other end of the corrugated pipe; and the first pre-tightening mechanism and the second pre-tightening mechanism provide pre-tightening force for two ends of the corrugated pipe through springs.
Preferably, the supporting rod is a metal round rod, one end of the supporting rod is fixedly connected with the inner side of the interface flange through a screw, the other end of the supporting rod is connected with one end of a limiting structure, and the limiting structure is used for adjusting the length of the supporting rod; the other end of the limiting structure is connected with one end of the spring through a connecting piece made of epoxy resin materials, and the other end of the spring is connected to the corrugated pipe.
Preferably, the limiting structure comprises a metal limiting block and a position adjusting ring, adjustable screws are arranged on the position adjusting ring and the limiting block respectively, and the supporting rod penetrates through the position adjusting ring.
Preferably, the test pipe section is manufactured by welding vacuum connecting joints and straight pipe sections on two sides of the spiral corrugated pipe; an inner core is arranged in the corrugated pipe to place the core of the superconducting cable, and threads and triangular fixing structures are arranged on two sides of the inner core to fix and straighten the core; preferably, the test chamber supports multiple types of helical bellows.
Preferably, the transition pipeline comprises an inlet straight pipe, a middle bent pipe and an outlet straight pipe; each pressure and temperature measuring point comprises a branch pipe, a branch pipe joint, a thermometer and a pressure guiding pipe, wherein each measuring point leads out the branch pipe from the main pipe of the supporting pipe section and is connected with one end of the thermometer or the pressure guiding pipe through the first branch pipe joint, and the other end of the thermometer or the pressure guiding pipe is provided with a second branch pipe joint; pressure and temperature measuring points are respectively arranged on one end of the inlet branch pipe close to the test pipe section, one end of the outlet branch pipe close to the test pipe section and two ends of the middle bent pipe.
Preferably, the test bench adopts the aluminium alloy support, and the universal wheel is installed to the bench below.
Preferably, the vacuum hood comprises two sections of stainless steel cylinders with the same diameter, and the two sections of cylinders and the cylinder and the interface flange are fixed through clamps.
Preferably, the head interface flange is at least provided with 2 KF40 interfaces and welded with 2 vacuum sleeve joints, the KF40 interface is used as a cabin penetrating port of a thermometer or a pressure guiding pipe, and the vacuum sleeve joints are used as a cabin penetrating port of a transition pipeline.
The beneficial effects of the utility model reside in that, compared with the prior art, the utility model discloses in a experimental test chamber of superconducting cable liquid nitrogen flow characteristic comprises vacuum hood, inside pipeline and bearing structure. The internal pipeline comprises a middle bent pipe capable of realizing 180-degree steering, so that extra pressure drop can be reduced, and simultaneous measurement of a plurality of corrugated pipes can be realized. The supporting structure can adjust the test cavity in various modes, so that the test cavity has the advantages of being simple and convenient to operate, accurate in measurement, various in use and the like.
Drawings
Fig. 1 is a schematic view of a system for testing the flow characteristics of liquid nitrogen in a superconducting cable corrugated pipe according to the present invention;
fig. 2 is a schematic diagram of an internal structure of a test chamber for a liquid nitrogen flow characteristic test of a superconducting cable according to the present invention;
fig. 3 is a schematic cross-sectional view of a test chamber model for testing the flow characteristics of the liquid nitrogen of the superconducting cable according to the present invention;
fig. 4 is a diagram of a sample chamber for a superconducting cable liquid nitrogen flow characteristic test in the present invention.
Reference numerals:
1-a liquid nitrogen dewar;
2-low temperature flow valve;
3-a subcooler;
4-bellows experimental chamber;
5-liquid nitrogen recovery tank;
6-molecular pump unit;
7-a data acquisition instrument;
8-a programmable controller;
9-a computer;
10. 12, 13, 14, 15-first to fifth thermometers;
11. 16-first and second pressure sensors;
17. 18-differential pressure sensor;
18-stud adjustment structure;
19-meniscus support plate.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Generally, in order to study the liquid nitrogen flow characteristics inside different corrugated pipes, a platform of a liquid nitrogen flow characteristic test system in the corrugated pipe can be set up. Fig. 1 is a schematic diagram of a system for testing the flow characteristics of liquid nitrogen in a superconducting cable corrugated pipe according to the present invention. As shown in figure 1, the utility model discloses a test system includes liquid nitrogen dewar jar, low temperature flow valve, subcooler, bellows test chamber, liquid nitrogen recovery jar, transition pipeline, molecular pump unit, data acquisition subassembly, data acquisition appearance, programmable logic controller and computer. The test liquid nitrogen is injected into the test cavity of the corrugated pipe through the low-temperature flow valve and the subcooler, and is recovered through the liquid nitrogen recovery tank after the test is completed.
Specifically, in the test process, high-pressure liquid nitrogen flows out of the liquid nitrogen Dewar tank, flows into the vacuum test cavity after passing through the low-temperature flow valve and the subcooler, flows out of the test cavity after passing through two sections of corrugated pipes in the vacuum test cavity, and enters the liquid nitrogen tank. The liquid nitrogen dewar tank, the low-temperature flow valve, the subcooler, the corrugated pipe test cavity and the liquid nitrogen recovery tank are sequentially and hermetically connected through a transition pipeline so as to ensure the flow of liquid nitrogen for the test in the test system.
Fig. 2 is a schematic diagram of an internal structure of a test chamber for a superconducting cable liquid nitrogen flow characteristic test of the present invention. Fig. 3 is a schematic cross-sectional view of a test chamber model for a superconducting cable liquid nitrogen flow characteristic test in the present invention. Fig. 4 is a diagram of a material object of a test chamber for a test of flow characteristics of superconducting cable liquid nitrogen in the present invention. As shown in fig. 2 to 4, a test chamber for testing the liquid nitrogen flow characteristics of a superconducting cable comprises a vacuum cover, a transition pipeline, a test pipe section, a support structure and a test bench.
The vacuum cover comprises a vacuum cover body, a transition pipeline and a first cabin penetrating port, wherein a head interface flange and a tail interface flange are arranged at two ends of the vacuum cover body; the transition pipeline is hermetically connected with a first test pipe section and a second test pipe section, each test pipe section comprises a test corrugated pipe, and the first test pipe section and the second test pipe section are connected through a middle bent pipe; and pressure and temperature measuring points are arranged on the transition pipeline.
In the embodiment of the present invention, the outer surface of the test chamber is formed by combining the columnar vacuum covers. The inlet end and the outlet end of the liquid nitrogen pipeline in the test cavity are both positioned at one end of the columnar test cavity and are respectively connected with the subcooler and the liquid nitrogen recovery tank. The other end of the test cavity is connected with a molecular pump unit for ensuring the vacuum state of the test cavity. The liquid nitrogen pipeline consists of a transition pipeline and a test pipeline section. The whole pipeline enters the vacuum cover from one end of the test cavity, then turns around through the bent pipe at the other end of the test cavity close to the test cavity, and finally penetrates out of the vacuum cover from the same end of the test cavity. Generally, the two sections of liquid nitrogen pipelines in front of and behind the bent pipe are parallel to each other and the vacuum test cavity. The design of the elbow is used for better measuring the pressure drop of two corrugated pipes simultaneously, and simultaneously reducing the introduction of additional pressure drop as much as possible.
Preferably, the test chamber further comprises a first support mechanism and a second support mechanism, and the first support mechanism and the second support mechanism are respectively arranged in the middle and the rear of the vacuum cover of the test chamber; and the height of the first and second supporting mechanisms is adjustable, and when the height of the first and second supporting mechanisms is adjusted, an adjustable angle is formed between the test chamber and the horizontal ground.
Because the inlet and the outlet of the liquid nitrogen pipeline are fixed on the head interface flange, the height of the inlet and the outlet of the liquid nitrogen pipeline is relatively fixed, so that the liquid nitrogen pipeline can form a specific angle relative to a horizontal plane by utilizing the height adjustment of the first supporting structure, and liquid nitrogen tests with different gradients can be completed.
Preferably, a second supporting structure is arranged between the front section cylinder and the ground, a third supporting structure is arranged between the rear section cylinder and the ground, and the heights of the front section cylinder and the rear section cylinder can be respectively adjusted through the second supporting structure and the third supporting structure. It can be understood that through sectional adjustment, the test cavity and the horizontal ground can form a certain angle to meet liquid nitrogen tests with different inclinations.
Preferably, the second supporting structure is a worm and gear lifting structure, and the height of the front section cylinder is adjusted through the top support; the third supporting structure is a stud adjusting structure, and the height of the rear section cylinder is adjusted through a crescent supporting plate. Additionally, the utility model discloses an in the embodiment, top support can be made for the rubber material, and this supporter is connected with the rotation runner to realize the regulation of drum height. The falcate backup pad can be made for the polytetrafluoroethylene material, and when a pair of screw about Ningdong stud, the backup pad can reciprocate to the realization is to the effective support of back vacuum hood barrel. The top support and the meniscus support plate are both designed to fit the arc surface of the cylinder and can stably support the cylinder. Once in place, the screws are locked. Because the lifting adjusting mechanisms of the worm gear, the worm and the stud bolt belong to the content in the prior art, the details are not repeated herein.
Preferably, the test chamber further comprises a third support structure, wherein the third support structure is a triangular support structure made of polytetrafluoroethylene and is located inside the test chamber and used for supporting the test tube section and the transition pipeline. The triangular supporting structure can fixedly support the pipe sections, and meanwhile, heat leakage of liquid nitrogen in the pipe from the outside is reduced as much as possible.
Preferably, the test cavity further comprises a first pre-tightening mechanism and a second pre-tightening mechanism, and the pre-tightening mechanism comprises a supporting rod, a limiting structure, a spring and a connecting piece; one end of the first pre-tightening mechanism is connected with the head interface flange, the other end of the first pre-tightening mechanism is fixed at one end of the corrugated pipe, one end of the second pre-tightening mechanism is connected with the tail interface flange, and the other end of the second pre-tightening mechanism is fixed at the other end of the corrugated pipe; and the first pre-tightening mechanism and the second pre-tightening mechanism provide pre-tightening force for two ends of the corrugated pipe through springs.
The utility model discloses an in the embodiment, in order to further fix the liquid nitrogen pipeline inside the vacuum test chamber, keep the state of flare-outing of different model bellows simultaneously, set up first and second pretension mechanism. The support rod in the pretensioning mechanism can be made of a metal round rod of 304 stainless steel with the diameter of 16mm and the length of 2 m.
Preferably, the supporting rod is a metal round rod, one end of the supporting rod is fixedly connected with the inner side of the interface flange through a screw, the other end of the supporting rod is connected with one end of a limiting structure, and the limiting structure is used for adjusting the length of the supporting rod; the other end of the limiting structure is connected with one end of the spring through a connecting piece made of epoxy resin materials, and the other end of the spring is connected to the corrugated pipe.
Specifically, limit structure includes metal stopper and positioning ring, has adjustable screw on positioning ring and the stopper respectively, and the bracing piece runs through the positioning ring.
When the length of the corrugated pipe needs to be changed to adjust the structure position so as to tension the corrugated pipe, screws on the positioning rings on the upper supporting rod and the lower supporting rod need to be unscrewed, and then the positioning rings slide on the supporting rods to a proper position. Meanwhile, the metal limiting block screw is unscrewed, and the relative position of the metal limiting block screw and the supporting rod is also adjusted. After the limiting block reaches a preset position, the long screw on the metal ring is screwed down to support the limiting block. At the moment, the spring connected to the epoxy resin connecting piece is pulled open, and then pretightening force for tensioning the experimental pipe section is provided.
The test chamber in the test can adapt to more corrugated pipes with different specifications by using the structure, and simultaneously, the corrugated pipes with different specifications are all in a straightened horizontal state all the time, so that the test data closer to the preset working condition is obtained.
Preferably, the test pipe section is manufactured by welding vacuum connection joints and straight pipe sections on two sides of the spiral corrugated pipe; and an inner core is arranged in the corrugated pipe to place the core of the superconducting cable, and threads and triangular fixing structures are arranged on two sides of the inner core to fix and straighten the core.
In order to connect the bellows to the usually already fixed transition line in the test chamber, the bellows can be treated beforehand. For example, vacuum connection joints may be welded on both sides of each test bellows. In one embodiment of the present invention, the vacuum connection may be a VCR female head of 1/2 inches. In combination, 1/2VCR male connectors may be welded to both the end of the transition line where the straight tube is inside the test chamber and the ends of the bent tube to connect to the bellows. In addition, straight pipe sections can be welded on two sides of the corrugated pipe to reduce the influence of the inlet effect and the outlet effect on the flow of liquid nitrogen in the pipe. After welding the straight pipe section and the vacuum connection joint, the length of the corrugated pipe section should be 1.00 m.
In addition, the inner core arranged in the corrugated pipe can be used for placing the superconducting cable core so as to simulate the working condition of inserting the cable core into the corrugated pipe in the actual working condition. In one embodiment of the present invention, the inner core has a diameter of 4mm and is made of 304 stainless steel. The threads arranged on the two sides of the inner core and the triangular fixing structures arranged on the two sides of the inner core can be used for fixing the wire cores. When the installation sinle silk, can insert the bellows with the inner core at first, screw triangle-shaped fixed knot structure from both sides screw afterwards, the sinle silk can be in the state of flare-outing for the bellows this moment to the sinle silk just is located the center axis position of bellows inner core.
Preferably, the test chamber supports multiple types of helical bellows. The bellows supports a variety of size options as it is subjected to the welding process of vacuum coupling joints and straight tubes. Preferably, the bellows has an outer diameter of between 9 and 20 millimeters and a length of between 940 and 960 millimeters.
In an embodiment of the present invention, the spiral corrugated pipes of four types are selected finally, and the outer diameter, wave height, wave distance, length and other parameters are shown in table 1.
TABLE 1 selection parameter table for spiral corrugated pipe
| Serial number | Outer diameter | Wave height | Wave distance | Length of | |
| 1 | 9 | 1mm | 2mm | 940mm | 0.5mm |
| 2 | 11 | 1mm | 2mm | 940mm | 0.5 |
| 3 | 15 | 2mm | 5mm | 960mm | 0.5 |
| 4 | 20 | 2mm | 6mm | 960mm | 0.5mm |
Simultaneously, the test pipeline still supports the dismantlement and the change of bellows. When the corrugated pipe is disassembled and replaced, the requirement of the vacuum degree in the vacuum cavity can be met only by replacing the gasket in the joint.
Preferably, the transition pipeline comprises an inlet straight pipe, a middle bent pipe and an outlet straight pipe; each pressure and temperature measuring point comprises a branch pipe, a branch pipe joint, a thermometer and a pressure guiding pipe, wherein the branch pipe is led out from the main pipe of the supporting pipe section and is connected with one end of the thermometer or the pressure guiding pipe through the first branch pipe joint; the pressure and temperature measuring points are respectively positioned on one end of the inlet branch pipe close to the test pipe section, one end of the outlet branch pipe close to the test pipe section and two ends of the middle bent pipe.
It can be understood that the inlet straight tube and the intermediate bent tube are connected with the first test tube section through the vacuum connection interface, and the intermediate bent tube and the outlet straight tube are connected with the second test tube section through the vacuum connection interface. And a fixed structure is welded on one side of the bending section of the middle bent pipe, so that the bent pipe can be fixed on the tail interface flange and the relative position of the bent pipe is kept unchanged.
And a plurality of pressure and temperature measuring points are arranged on the transition pipe section. The measurement point is a straight pipe leading from the main pipe, typically 6mm in diameter. Meanwhile, the other end of the straight pipe is welded with a male head of a 3mm clamping sleeve, and a female head of the 3mm clamping sleeve is installed at one end of the thermometer or the pressure leading pipe and can be connected with the thermometer or the pressure leading pipe in a matched mode. Therefore, according to the needs of the experiment, a thermometer or a pressure guiding pipe can be assembled at the corresponding position to complete the measurement of the pressure and the temperature.
In an embodiment of the present invention, 4 pairs of temperature and pressure measuring points can be provided on the transition pipe section. There are 1 pair of inlet section straight tubes, 2 pairs of elbow sections, and 1 pair of outlet section straight tubes. Specific connection means can also be seen in fig. 1-2. The utility model discloses an in the embodiment, the external diameter that can set up the straight tube is 15mm, and the external diameter of return bend is 25mm, and the horizontal interval of two experimental pipeline sections is 160 mm.
Preferably, the test bench adopts the aluminium alloy support, and the universal wheel is installed to the bench below. The utility model relates to an in the embodiment, the aluminium alloy test bench is formed by the concatenation of 45 specification aluminium alloy, and its permission load is greater than the weight of laboratory bench. Meanwhile, the widths of the aluminum profile test bench and the aluminum profile test bench used by other elements in the test system can be kept consistent, so that more test modules can be spliced at a later stage. The universal wheel installed below the test bench can facilitate the movement of the bench to better match other experimental parts.
Preferably, the vacuum hood comprises two sections of stainless steel cylinders with the same diameter, and the two sections of cylinders and the cylinder and the interface flange are fixed through clamps. For convenient disassembly and maintenance, the vacuum hood can be designed into two sections of cylinders with the same diameter. The utility model discloses an embodiment can choose for use stainless steel 304 drum, and head and afterbody all are equipped with the interface flange.
Preferably, the head interface flange is at least provided with 2 KF40 interfaces and welded with 2 vacuum sleeve joints, the KF40 interface is used as a cabin penetrating port of a thermometer or a pressure guiding pipe, and the vacuum sleeve joints are used as a cabin penetrating port of a transition pipeline.
The utility model discloses an in the embodiment, be provided with 4 KF 40's interface on the head interface flange, wherein two can regard as the thermometer respectively and draw the cross cabin mouth of pressing the pipe, 2 can be for reserving the interface in addition, reform transform or provide the interface for vacuum test chamber evacuation operation for subsequent upgrading. Meanwhile, a stainless steel handle is welded on the tail flange, so that the device is convenient to disassemble and maintain.
Under the design, the experiment table can meet the requirement that liquid nitrogen in the pipe flows under the design working condition of 0.4MPa, and simultaneously, the vacuum degree of the cavity in the vacuum cover is maintained below 1E-2 Pa.
The beneficial effects of the utility model reside in that, compared with the prior art, the utility model discloses in a experimental test chamber of superconducting cable liquid nitrogen flow characteristic comprises vacuum hood, inside pipeline and bearing structure. The middle bent pipe capable of realizing 180-degree steering is arranged in the inner pipeline, so that extra pressure drop can be reduced, and simultaneous measurement of a plurality of corrugated pipes is realized. The supporting structure can adjust the test cavity in various modes, so that the test cavity has the advantages of being simple and convenient to operate, accurate in measurement, various in use and the like.
The applicant of the present invention has made detailed description and description on the implementation examples of the present invention with reference to the drawings, but those skilled in the art should understand that the above implementation examples are only the preferred embodiments of the present invention, and the detailed description is only for helping the reader to better understand the spirit of the present invention, and not for limiting the protection scope of the present invention, on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the protection scope of the present invention.
Claims (13)
1. The utility model provides a test chamber for experimental superconductive cable liquid nitrogen flow characteristic, includes vacuum cover, transition pipeline, test tube section, bearing structure, test bench, its characterized in that:
a head interface flange and a tail interface flange are arranged at two ends of the vacuum cover, and a first hatch and a second hatch are arranged on the head interface flange, so that the transition pipeline enters the vacuum cover through the first hatch passing opening and passes out of the vacuum cover through the second hatch passing opening;
the transition pipeline is hermetically connected with a first test pipe section and a second test pipe section, each test pipe section comprises a test corrugated pipe, and the first test pipe section and the second test pipe section are connected through a middle bent pipe;
and pressure and temperature measuring points are arranged on the transition pipeline.
2. A test chamber for testing the flow characteristics of liquid nitrogen in a superconducting cable according to claim 1, wherein:
the test cavity further comprises a first support mechanism and a second support mechanism, and the first support mechanism and the second support mechanism are respectively arranged in the middle and the rear of the vacuum cover of the test cavity; and the number of the first and second electrodes,
the height of the first supporting mechanism and the height of the second supporting mechanism are adjustable, and when the height of the first supporting mechanism and the height of the second supporting mechanism are adjusted, an adjustable angle is formed between the test cavity and the horizontal ground.
3. A test chamber for testing liquid nitrogen flow characteristics of a superconducting cable according to claim 2, wherein:
the first supporting structure is located between the front section cylinder and the ground, the second supporting structure is located between the rear section cylinder and the ground, and the first supporting structure and the second supporting structure can respectively adjust the heights of the front section cylinder and the rear section cylinder.
4. A test chamber for testing the liquid nitrogen flow characteristics of a superconducting cable according to claim 3, wherein:
the first supporting structure is a worm and gear lifting structure, and the height of the front section cylinder is adjusted through a top supporting object; the second supporting structure is a stud adjusting structure, and the height of the rear-section cylinder is adjusted through the crescent supporting plate.
5. A test chamber for testing the flow characteristics of liquid nitrogen in a superconducting cable according to claim 1, wherein:
the test chamber further comprises a third supporting structure, the third supporting structure is a triangular supporting structure made of polytetrafluoroethylene and located inside the test chamber, and the third supporting structure is used for supporting the test pipe section and the transition pipeline.
6. A test chamber for testing the flow characteristics of liquid nitrogen in a superconducting cable according to claim 1, wherein:
the test cavity also comprises a first pre-tightening mechanism and a second pre-tightening mechanism, wherein the pre-tightening mechanism comprises a supporting rod, a limiting structure, a spring and a connecting piece;
one end of the first pre-tightening mechanism is connected with the head interface flange, the other end of the first pre-tightening mechanism is fixed at one end of the corrugated pipe, one end of the second pre-tightening mechanism is connected with the tail interface flange, and the other end of the second pre-tightening mechanism is fixed at the other end of the corrugated pipe; and the number of the first and second electrodes,
the first pre-tightening mechanism and the second pre-tightening mechanism provide pre-tightening force for two ends of the corrugated pipe through springs.
7. A test chamber for testing the liquid nitrogen flow characteristics of a superconducting cable according to claim 6, wherein:
the supporting rod is a metal round rod, one end of the supporting rod is fixedly connected with the inner side of the interface flange through a screw, the other end of the supporting rod is connected with one end of the limiting structure, and the limiting structure is used for adjusting the length of the supporting rod;
the other end of the limiting structure is connected with one end of the spring through a connecting piece made of epoxy resin materials, and the other end of the spring is connected to the corrugated pipe.
8. A test chamber for testing the flow characteristics of liquid nitrogen in a superconducting cable according to claim 7, wherein:
the limiting structure comprises a metal limiting block and a position adjusting ring, adjustable screws are arranged on the position adjusting ring and the limiting block respectively, and the supporting rod penetrates through the position adjusting ring.
9. A test chamber for testing the flow characteristics of liquid nitrogen in a superconducting cable according to claim 8, wherein:
the test pipe section is manufactured by welding vacuum connecting joints and straight pipe sections on two sides of the spiral corrugated pipe; and the number of the first and second electrodes,
an inner core is arranged in the corrugated pipe to place a core of the superconducting cable, and threads and triangular fixing structures are arranged on two sides of the inner core to fix and straighten the core;
preferably, the test chamber supports multiple types of helically corrugated tubing.
10. A test chamber for testing the flow characteristics of liquid nitrogen in a superconducting cable according to claim 1, wherein:
the transition pipeline comprises an inlet straight pipe, a middle bent pipe and an outlet straight pipe; and the number of the first and second electrodes,
the pressure and temperature measuring points comprise branch pipes, branch pipe joints, thermometers and pressure guiding pipes, wherein each measuring point leads out a branch pipe from a main pipe of the support pipe section and is connected with one end of each thermometer or each pressure guiding pipe through a first branch pipe joint, and the other end of each thermometer or each pressure guiding pipe is provided with a second branch pipe joint;
the pressure and temperature measuring points are respectively positioned on one end of the inlet branch pipe close to the test pipe section, one end of the outlet branch pipe close to the test pipe section and two ends of the middle bent pipe.
11. A test chamber for testing the flow characteristics of liquid nitrogen in a superconducting cable according to claim 1, wherein:
the test bench adopts the aluminium alloy support, and the universal wheel is installed to the bench below.
12. A test chamber for testing the flow characteristics of liquid nitrogen in a superconducting cable according to claim 11, wherein:
the vacuum cover comprises two sections of stainless steel cylinders with the same diameter, and the two sections of cylinders and the interface flanges are fixed through clamps.
13. A test chamber for testing liquid nitrogen flow characteristics of a superconducting cable according to claim 12, wherein:
the pipeline transition pipeline comprises a head interface flange and is characterized in that at least 2 KF40 interfaces are designed on the head interface flange, 2 vacuum sleeve joints are welded on the head interface flange, the KF40 interfaces serve as cabin penetrating ports of thermometers or pressure leading pipes, and the vacuum sleeve joints serve as cabin penetrating ports of transition pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121483795.8U CN217505706U (en) | 2021-06-30 | 2021-06-30 | Test chamber for liquid nitrogen flow characteristic test of superconducting cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121483795.8U CN217505706U (en) | 2021-06-30 | 2021-06-30 | Test chamber for liquid nitrogen flow characteristic test of superconducting cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217505706U true CN217505706U (en) | 2022-09-27 |
Family
ID=83337442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121483795.8U Active CN217505706U (en) | 2021-06-30 | 2021-06-30 | Test chamber for liquid nitrogen flow characteristic test of superconducting cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217505706U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117871621A (en) * | 2024-03-11 | 2024-04-12 | 浙江省白马湖实验室有限公司 | Visual experimental device, detection method thereof and capacitance tomography system |
-
2021
- 2021-06-30 CN CN202121483795.8U patent/CN217505706U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117871621A (en) * | 2024-03-11 | 2024-04-12 | 浙江省白马湖实验室有限公司 | Visual experimental device, detection method thereof and capacitance tomography system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE10137552C1 (en) | Apparatus comprises cryo-generator consisting of cooling device having regenerator and pulse tube with heat exchangers arranged between them | |
| CN217505706U (en) | Test chamber for liquid nitrogen flow characteristic test of superconducting cable | |
| CN104697739B (en) | Cryogen flow resistance and Temperature Distribution test device in adiabatic corrugated tube | |
| CN103278308B (en) | Visualization experiment device for deep cryogenic two-phase countercurrent process | |
| CN103968878B (en) | Low temperature pulsating heat pipe experimental provision | |
| CN106370692B (en) | The solution modeling visual inspection device of trace soluble impurity in cryogenic liquid | |
| CN106768802B (en) | A kind of high-purity special gas charging device and methods for filling for shock tunnel | |
| CN111665465B (en) | Liquid helium-free superconducting magnet system | |
| CN107725931A (en) | Adaptive joint clasp and its application method | |
| CN203549286U (en) | Detachable heat leakage test sealing structure of low-temperature heat insulation pipeline | |
| CN208155514U (en) | Water injection well anti-freeze pressure meter | |
| CN115876289A (en) | Calibration device of single-phase low-temperature fluid flowmeter | |
| CN205262522U (en) | Novel testing element | |
| CN214502823U (en) | Pressure testing device for U-shaped tube heat exchanger | |
| CN219140171U (en) | Spiral pipe compensator | |
| CN107462509B (en) | A kind of gas permeability rock core grasping system suitable for more specification Oil in Super-low Permeability rock cores | |
| CN205781650U (en) | A kind of thermal expansion of pipeline compensation device | |
| CN101936865B (en) | Density measuring method suitable for single-phase flow fluid and measuring device thereof | |
| CN111397880A (en) | Test bench for measuring friction force of reciprocating type framework oil seal | |
| CN213984822U (en) | Rubber flexible connecting pipe balance measuring device | |
| CN114496457A (en) | Horizontal Dewar high-temperature superconducting current lead structure and design method | |
| CN219655552U (en) | Material returning leg metal octagonal expansion joint | |
| CN220205393U (en) | Conveying tool for supercritical helium storage Dewar | |
| CN220207096U (en) | Verifying device for supercritical helium pressure stabilizing system | |
| CN218971379U (en) | Transmission cooling mechanism of gas compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |