Distributed sodium leakage detector system

Abstract

The utility model provides a distributed sodium leakage detector system. The distributed sodium leakage detector system comprises a bridging insulator and a distributed sodium leakage detector. The crossover insulator is configured to crossover the armored electric heater. The distributed sodium leakage detector is arranged to pass through the crossover insulator. According to the utility model, the bridging insulator is additionally arranged, the bridging insulator is adopted for bridging when the armored electric heater is installed, and the distributed sodium leakage detector passes through the bridging insulator, so that the problem that the detector is assembled and installed at the same time according to the condition of a pipeline or equipment on site is solved, and the detector can be prefabricated in a factory; the length of the detector is adjusted on site according to a pipeline and an equipment structure, so that the assembly and installation difficulty is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sodium leakage detection, and in particular relates to a distributed sodium leakage detector system. Background Art

[0002] The demonstration fast reactor uses liquid sodium metal as a coolant, but sodium is an active metal that reacts violently with water, and high-temperature liquid sodium can burn in the air. In order to ensure the safe and stable operation of the nuclear power unit, it is necessary to monitor the sodium leakage of the mechanical equipment and pipelines of the demonstration fast reactor. Therefore, how to set up a sodium leakage detector to find the location of the sodium leakage as early as possible has become a technical problem that needs to be solved urgently.

[0003] The basic principle of the distributed sodium leakage detector is that the leakage of metallic sodium causes the two stainless steel wires to conduct and send out a switch signal; under normal circumstances, the two stainless steel wires are separated and insulated by ceramic parts, and the insulation resistance between the two stainless steel wires is large; after sodium leakage occurs, metallic sodium flows along the outer wall of the equipment or pipeline, causing the two stainless steel wires to be short-circuited by the leaked sodium, and the loop is connected to trigger an alarm signal, thereby realizing the monitoring of sodium leakage. One end of the detector is connected to the monitoring system, and the other end is set on site for easy maintenance.

[0004] In order to accurately monitor whether there is leakage of metallic sodium, distributed sodium leakage detectors need to be tightly spirally wound on the outer surface of the pipeline or S-shaped on the surface of the sodium-related equipment; on-site personnel assemble and install the detectors according to the structure and installation of the pipeline or equipment, and they also need to avoid armored electric heaters, branch pipes, instruments, etc. during installation. Because distributed sodium leakage detectors need to be arranged on the surface of all sodium-related pipelines and equipment, a demonstration fast reactor needs to arrange about 3,000 measurement points, and the number of ceramic parts that make up the detectors is about 8 million; on-site assembly and installation are difficult and time-consuming. Utility Model Content

[0005] In view of this, an embodiment of the utility model is committed to providing a distributed sodium leakage detector system, which adds a jumper insulator and uses the jumper insulator to jumper the armored electric heater to solve the problem of difficulty and long period of on-site assembly and installation caused by the need to avoid the armored electric heater when installing the distributed sodium leakage detector in the prior art.

[0006] The utility model provides a distributed sodium leakage detector system, which comprises a jumper insulator and a distributed sodium leakage detector. The jumper insulator is configured as a jumper armored electric heater. The distributed sodium leakage detector is arranged to pass through the jumper insulator.

[0007] In the above scheme, by adding jumper insulators, jumper insulators are used for bridging when installing the armored electric heater, and the distributed sodium leakage detector passes through the jumper insulator, which solves the problem of assembling and installing the detectors on site according to the pipeline or equipment conditions. The detectors can be prefabricated in the factory, and the length of the detectors can be adjusted on site according to the pipeline and equipment structure, reducing the difficulty of assembly and installation.

[0008] In a specific embodiment of the utility model, the distributed sodium leakage detector includes two stainless steel wires, two wiring terminals, two double-hole elbows, two double-hole straight tubes and a plurality of insulators. The two wiring terminals, the two double-hole elbows, the two double-hole straight tubes and the plurality of insulators are used for insulation between the two stainless steels, and the two wiring terminals are used for connection between the two stainless steel wires and the signal cable respectively.

[0009] In a specific implementation of the utility model, the distributed sodium leakage detector further includes a stainless steel fixing pressing plate. The stainless steel fixing pressing plate is configured to fix the insulator, the double-hole elbow and the jumper insulator. The double-hole elbow is provided with a double flat empty slot, and the stainless steel fixing pressing plate passes through the double flat empty slot to tightly fix the double-hole elbow and the sodium-related structure.

[0010] In a specific implementation of the utility model, the width of the stainless steel fixed pressing plate ranges from 5 mm to 8 mm, and the thickness ranges from 0.3 mm to 0.8 mm.

[0011] In a specific implementation of the utility model, the bottom surface of the double-hole elbow is a plane.

[0012] In a specific implementation of the utility model, the angle between the inner hole of the curved section of the double-hole elbow and the inner hole of the straight tube section is 50°.

[0013] In a specific implementation of the utility model, the cross section and side surface of the straight pipe portion of the double-hole elbow are both rectangular.

[0014] In a specific implementation of the utility model, a double-hole elbow is provided with double pressing grooves, and the size of the pressing grooves is 7mm×1.5mm.

[0015] In a specific implementation of the utility model, the outer dimensions of the jumper insulator are 17 mm×14 mm×9.5 mm.

[0016] In a specific implementation of the utility model, a first groove is provided on the bottom end surface of the jumper insulator, and the first groove is configured to accommodate the armored electric heater. A second groove is provided on the top end surface of the jumper insulator, and the second groove is configured to accommodate the distributed sodium leakage detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Shown is a partially enlarged schematic diagram of a distributed sodium leakage detector system provided by an embodiment of the utility model.

[0018] Figure 2A Shown is a schematic diagram of the three-dimensional structure of a jumper insulator provided by an embodiment of the utility model.

[0019] Figure 2B Shown Figure 2A Front view of the jumper insulator shown.

[0020] Figure 2C Shown Figure 2A A side view of a jumper insulator is shown.

[0021] Figure 2D Shown Figure 2A A top view of the jumper insulator is shown.

[0022] Figure 3 Shown is a schematic structural diagram of a distributed sodium leakage detector provided by an embodiment of the utility model.

[0023] Figure 4A Shown is a three-dimensional structural schematic diagram of a double-hole elbow provided by an embodiment of the utility model.

[0024] Figure 4B Shown Figure 4A Front view of the double hole elbow shown.

[0025] Figure 4C Shown Figure 4A Side view of the double hole elbow shown. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] At least one embodiment of the present invention provides a distributed sodium leakage detector system, exemplarily, referring to Figure 1The distributed sodium leakage detector system 100 includes a jumper insulator 10 and a distributed sodium leakage detector 20. The jumper insulator 10 is configured to jumper the armored electric heater a. The distributed sodium leakage detector 20 is arranged to pass through the jumper insulator 10. In this way, by adding the jumper insulator 10, the jumper insulator 10 is used for bridging when the armored electric heater a is encountered during installation, and the distributed sodium leakage detector 20 passes through the jumper insulator 10, and there is no need to avoid the armored electric heater a during installation, which solves the problem of assembling and installing the detector on site according to the pipeline or equipment conditions, and realizes that the detector can be prefabricated in the factory, and the length of the detector is adjusted on site according to the pipeline and equipment structure, which reduces the difficulty of assembly and installation.

[0028] The jumper insulator 10 only needs to be able to jumper the armored electric heater a. On this basis, the embodiment of the utility model does not specifically limit the structure of the jumper insulator 10.

[0029] In at least one embodiment of the present invention, illustratively, reference FIG. 2A to FIG. 2D , a first groove M is provided on the bottom end face of the jumper insulator 10, and the first groove M is configured to accommodate the armored electric heater a. A second groove N is provided on the top end face of the jumper insulator 10, and the second groove N is configured to accommodate the distributed sodium leakage detector 20. In this way, by providing the first groove M dedicated to accommodating the armored electric heater a on the bottom end face of the jumper insulator 10, the armored electric heater a can pass directly through the first groove M. In addition, by providing the second groove N dedicated to accommodating the distributed sodium leakage detector 20 on the top end face of the jumper insulator 10, the position of the distributed sodium leakage detector 20 can be fixed by using the second groove N.

[0030] The width and depth of the first groove M and the second groove can be set according to actual needs. For example, the width of the first groove M is 8 mm, and the depth of the first groove M is 5 mm. The width of the second groove N is 10 mm, and the depth of the second groove N is 2.5 mm.

[0031] The outer dimensions of the jumper insulator 10 can be designed according to the structure of the armored electric heater a. For example, in some embodiments, the outer dimensions of the jumper insulator 10 are 17 mm×14 mm×9.5 mm.

[0032] Furthermore, in some embodiments, the corners of the jumper insulator 10 may be configured to be an inwardly concave arc shape, and the diameter of the arc may be 4 mm.

[0033] One end of the distributed sodium leakage detector 20 can be used for inspection, and the other end of the distributed sodium leakage detector 20 can be connected to an I / O cabinet.

[0034] In at least one embodiment of the present invention, illustratively, reference Figure 1 and Figure 3 The distributed sodium leakage detector 20 includes two stainless steel wires 21, two wiring terminals 22, two double-hole elbows 23, two double-hole straight tubes 24 and a plurality of insulators 25. The two wiring terminals 22, the two double-hole elbows 23, the two double-hole straight tubes 24 and the plurality of insulators 25 are all used for insulation between the two stainless steels, and the two wiring terminals 22 are respectively used for connecting the two stainless steel wires 21 with the signal cable. In this way, by arranging the distributed sodium leakage detector 20 to be assembled from two stainless steel wires 21, two wiring terminals 22, two double-hole elbows 23, two double-hole straight tubes 24 and a plurality of insulators 25, the structure of the distributed sodium leakage detector 20 is simple.

[0035] It should be noted that the material and structure of the stainless steel wire 21 can be set according to actual needs. For example, the grade of the stainless steel wire 21 can be 022Cr17Ni12Mo2, and the diameter of the stainless steel wire 21 can be a soft steel wire of 1 mm. The multiple insulators 25 can include at least one first insulator 25a and at least one second insulator 25b. The outside of the terminal 22 can also be provided with a heat shrinkable plastic tube that can protect the terminal 22.

[0036] After the detector was installed on site, a large number of false alarms occurred. Through statistical analysis, it was determined that the main reason for the false alarms was that the double-hole elbow component was detached from the stainless steel fixing pressure plate, causing the stainless steel wire of the distributed sodium leakage detector to short-circuit. Because the double-hole elbow structure is a cylinder, the fit with the equipment or pipeline surface is not high, and the fixing groove is shallow, which causes the stainless steel pressure plate to fall off easily after being fixed. The frequent occurrence of false alarms will directly affect the operating personnel's correct judgment of the production site situation.

[0037] Based on the above analysis, the embodiment of the utility model optimizes the double-hole elbow 23. In the following, the structural design of the double-hole elbow 23 is described with examples in conjunction with specific embodiments.

[0038] In at least one embodiment of the present invention, illustratively, reference Figure 1 and Figure 3, the distributed sodium leakage detector 20 also includes a stainless steel fixing pressing plate 26. The stainless steel fixing pressing plate 26 is configured to fix the insulator 25, the double-hole elbow 23 and the jumper insulator 10. The double-hole elbow 23 is provided with a double flat empty slot, and the stainless steel fixing pressing plate 26 passes through the double flat empty slot to tightly fix the double-hole elbow 23 to the sodium-related structure. In this way, by changing the double-hole elbow 23 from the outer groove type of the elbow to a double flat hole groove, the stainless steel fixing pressing plate 26 is used to pass through the flat hole groove to tightly fix it to the equipment or pipeline, which greatly reduces or prevents the double-hole elbow 23 from detaching from the stainless steel fixing pressing plate 26 during the construction process or operation process, and reduces or avoids the situation where the stainless steel wire 21 of the distributed sodium leakage detector 20 is short-circuited due to the detachment of the double-hole elbow 23, causing false alarms.

[0039] It should be noted that the structural design of the stainless steel fixed pressing plate 26 can be designed according to actual needs. For example, in some embodiments, the width of the stainless steel fixed pressing plate 26 ranges from 5 mm to 8 mm, and the thickness ranges from 0.3 mm to 0.8 mm.

[0040] In at least one embodiment of the present invention, illustratively, reference FIG. 4A to FIG. 4C , the bottom surface of the double-hole elbow 23 is a plane. In this way, by changing the bottom surface of the double-hole elbow 23 into a plane, the double-hole elbow 23 is not prone to flipping during use.

[0041] In at least one embodiment of the present invention, illustratively, reference FIG. 4A to FIG. 4C , the angle between the inner hole of the curved section of the double-hole elbow 23 and the inner hole of the straight tube is 50°. In this way, by adjusting the inner hole of the curved section of the double-hole elbow 23 and the inner hole of the straight tube to an angle of 50°, it is convenient to pass the stainless steel wire 21.

[0042] In at least one embodiment of the present invention, illustratively, reference FIG. 4A to FIG. 4C The cross section and side of the straight pipe part of the double-hole elbow 23 are both rectangular. For example, the cross section of the straight pipe part of the double-hole elbow 23 has a size of 13 mm×11 mm, and the side of the straight pipe part of the double-hole elbow 23 has a size of 38 mm×13 mm.

[0043] It should be noted that the straight pipe portion of the double-hole elbow 23 can be extended according to actual needs.

[0044] In at least one embodiment of the present invention, illustratively, reference FIG. 4A to FIG. 4C The double-hole elbow 23 is provided with a double pressing groove, and the size of the pressing groove is 7mm×1.5mm. In this way, by providing a double pressing groove on the double-hole elbow 23, and setting the size of the pressing groove to 7mm×1.5mm, the stainless steel pressing sheet is further not easy to be separated after being fixed, thereby avoiding frequent false alarms.

[0045] The above-mentioned optimized design of the double-hole elbow 23 in the embodiment of the utility model is simple and easy to operate, and also makes the distributed sodium leakage detector 20 highly reliable.

[0046] It should be noted that FIG. 2A to FIG. 2D and FIG. 4A to FIG. 4C The dimensions marked are only exemplary and can be adjusted according to actual needs.

[0047] Below, in conjunction with a specific implementation, an installation method of the distributed sodium leakage detector system 100 is illustrated.

[0048] S1: Use stainless steel wires 21 to connect a certain number of insulators 25 in series to assemble into a semi-finished product with a certain length specification.

[0049] For example, if the plurality of insulators 25 include a first insulator 25 a and a second insulator 25 b , the first insulator 25 a and the second insulator 25 b may be connected in series according to a certain quantity ratio by using the stainless steel wire 21 .

[0050] S2: The semi-finished distributed sodium leakage detector 20 is fixed on the surface of the equipment or pipeline using a stainless steel fixing pressing sheet 26 and a jumper insulator 10.

[0051] S3: A double-hole bent pipe 23, a double-hole straight pipe 24 and a connection terminal 22 are respectively assembled at both ends of the distributed sodium leakage detector 20 to assemble a distributed sodium leakage detector 20.

[0052] S4: The double-hole elbow 23 is fixed to the surface of the equipment or pipeline using a stainless steel fixing pressing plate 26.

[0053] S5: Connect the wiring terminal 22 at one end of the distributed sodium leakage detector 20 to the signal cable, and use the other end for inspection.

[0054] It should be noted that the combination of the various technical features in the embodiments of the present invention is not limited to the combination recorded in the embodiments of the present invention or the combination recorded in the specific embodiments. All technical features recorded in the present invention can be freely combined or combined in any way unless there is a contradiction between them.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A distributed sodium leak detector system, characterized in that: include: A jumper insulator configured to jumper an armored electric heater; as well as A distributed sodium leakage detector is arranged to pass through the jumper insulator.

2. The distributed sodium leak detector system according to claim 1, characterized in that: The distributed sodium leakage detector includes two stainless steel wires, two wiring terminals, two double-hole bent pipes, two double-hole straight pipes and multiple insulators, wherein the two wiring terminals, the two double-hole bent pipes, the two double-hole straight pipes and the multiple insulators are all used for insulation between the two stainless steels, and the two wiring terminals are respectively used for connecting the two stainless steel wires with the signal cable.

3. The distributed sodium leak detector system according to claim 2, characterized in that: The distributed sodium leakage detector further comprises a stainless steel fixing pressing plate, wherein the stainless steel fixing pressing plate is configured to fix the insulator, the double-hole elbow and the jumper insulator. The double-hole bent pipe is provided with double flat empty grooves, and the stainless steel fixed pressing sheet passes through the double flat empty grooves so that the double-hole bent pipe and the sodium-related structure are tightly fixed.

4. The distributed sodium leak detector system according to claim 3, characterized in that: The width of the stainless steel fixed pressing sheet is in the range of 5 mm to 8 mm, and the thickness is in the range of 0.3 mm to 0.8 mm.

5. The distributed sodium leak detector system according to claim 2, characterized in that: The bottom surface of the double-hole elbow is a plane.

6. The distributed sodium leak detector system according to claim 2, characterized in that: The included angle between the inner hole of the curved section of the double-hole curved pipe and the inner hole of the straight pipe portion is 50°.

7. The distributed sodium leak detector system according to claim 2, characterized in that: The cross section and side surface of the straight pipe portion of the double-hole elbow are both rectangular.

8. The distributed sodium leak detector system according to claim 2, characterized in that: The double-hole bent pipe is provided with double pressing grooves, and the size of the pressing grooves is 7mm×1.5mm.

9. The distributed sodium leak detector system according to any one of claims 1 to 8, characterized in that: The bottom end surface of the jumper insulator is provided with a first groove, and the first groove is configured to accommodate the armored electric heater. A second groove is provided on the top end surface of the jumper insulator, and the second groove is configured to accommodate the distributed sodium leakage detector.

10. The distributed sodium leak detector system according to any one of claims 1 to 8, characterized in that: The outer dimensions of the jumper insulator are 17 mm×14 mm×9.5 mm.

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