CN209374066U - A conveniently installed pipe temperature measuring device for nuclear power plants - Google Patents

Abstract

The utility model relates to pipeline of nuclear power plant to monitor field, more particularly to a kind of pipeline of nuclear power plant temperature measuring equipment of convenient installation, component is measured including temperature, temperature measurement component includes the steel band being set on tested pipeline outer wall and interval is laid in the armoured thermocouple on the steel band, through-hole that the measurement end of the armoured thermocouple penetrates on the steel band is simultaneously affixed with the outer wall of the tested pipeline, protection sleeve pipe component and telescopic tube assembly is passed sequentially through with the cable that the armoured thermocouple is electrically connected to be electrically connected with heat fatigue monitoring system, the temperature measuring equipment structure of the utility model is simple, high reliablity, installation and disassembly are all very convenient, armoured thermocouple is remained with tested pipeline outer wall and is contacted, thermal losses is few, monitoring temperature precision is high；Fairlead is directly anchored on steel band, simplifies measurement end structure, the telescopic tube assembly stroke of the present apparatus is up to 50%, so as to meet the requirement of site examining and repairing.

Description

A conveniently installed pipe temperature measuring device for nuclear power plants

technical field

The utility model relates to the field of nuclear power plant pipeline monitoring, in particular to a conveniently installed nuclear power plant pipeline temperature measuring device.

Background technique

In nuclear power plants, the mixing of hot and cold fluids in pipelines can be subdivided into two forms: one is the fluid with a higher flow rate, and the other is the fluid with a lower flow rate. As shown in Figure 1, when the fluid flow rate is high, the hot and cold fluids at the confluence begin to fully mix, and the temperature of the fluid in the mixing area changes drastically, which causes thermal fatigue (thermal shock) in this area or downstream pipelines; Figure 2 As shown, when the fluid flow rate is low, due to the different densities of water at different temperatures and the effect of gravity, stratification of hot and cold fluids will first be formed in the horizontal section of the confluence, and complete mixing will occur after a certain distance; The delamination boundary will change periodically with the change of fluid flow rate. Under the action of cyclic load, the damage of the local high stress part will gradually accumulate. Failure mode of fracture, thereby inducing thermal fatigue (thermal delamination) in the area or downstream piping.

In addition, the stable thermal stratification in the auxiliary pipe branches connected to the main pipe of the primary circuit is affected by the fluid in the primary circuit. The temperature and pressure of the high-temperature and high-pressure fluid in the primary circuit will change during the transient operation of the power plant, forming turbulent flow and penetrating into the branch pipes connected to it, breaking the original stable thermal stratification in the branch pipes, resulting in heat generation in the pipelines in this area. fatigue.

Facing the above problems, there is a need for a thermal fatigue monitoring device and method for nuclear power plant pipelines, which can conduct long-term detection of thermal fatigue of nuclear power plant pipeline materials, which can not only reduce the radiation dose of operational monitoring personnel, but also obtain more accurate Monitoring results.

Contents of the invention

The utility model provides a conveniently installed nuclear power plant pipeline temperature measuring device capable of solving the above problems.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a conveniently installed nuclear power plant pipe temperature measurement device, including a temperature measurement assembly, the temperature measurement assembly includes a steel belt sleeved on the outer wall of the pipe to be tested and a spacer The armored thermocouple arranged on the steel strip, the measuring end of the armored thermocouple penetrates the through hole on the steel strip and sticks to the outer wall of the pipeline to be tested, and the armored thermocouple The cables that are electrically connected to the dual phases are electrically connected to the thermal fatigue monitoring system through the protective sleeve assembly and the telescopic pipe assembly in turn.

Further, both ends of the steel strip are fixed by a snap-fit assembly.

Further, the engaging assembly includes a hook disposed at the first end of the steel strip and a matching buckle disposed at the second end of the steel strip.

Further, the second end of the steel belt is provided with a concave groove, the buckle is connected with the adjustment assembly, and the adjustment assembly includes a support set in the concave groove, and is screwed to the support The screw rod and the adjusting nut sleeved on one end of the screw rod, the buckle is connected with the other end of the screw rod.

Further, the protective sleeve assembly includes an outlet tube connected to the outer wall of the steel belt for the cable to pass through, a sleeve rotatably sleeved on the outside of the outlet tube, the outlet tube and A perforation for the cable to pass through is fitted on the sleeve.

Further, the lead-out pipe is provided with a first hole, the sleeve is provided with a second hole, and the sleeve has a first working position and a second working position. When the sleeve is located at the first In the working position, the first hole of the lead-out tube and the second hole of the sleeve are combined to form the perforation for the cable to pass through; when the sleeve is rotated to the second working position , the first hole and the second hole are staggered.

Further, the telescopic tube assembly includes a first protection tube and a second protection tube connected to the first protection tube, the first protection tube can slide and extend along the second protection tube The protection tube is connected.

Further, one end of the first protection tube is connected to the casing through a first joint assembly; the other end of the first protection tube is connected to the second protection tube through a second joint assembly.

Further, the first joint assembly includes a first pipe joint sleeved on the sleeve and the end of the first protection tube and a first fastening assembly for fixing them; the second joint The assembly includes a second pipe joint sheathed on the ends of the first protection tube and the second protection tube and a second fastening component for fixing them.

Further, there are multiple armored thermocouples, and all the armored thermocouples are arranged at intervals on the surface of the steel strip, and the cables and the steel strip are fixed by wire hoops.

After adopting the above technical scheme, the utility model has the following advantages compared with the prior art: the temperature measuring device of the utility model has simple structure, high reliability, convenient installation and disassembly, and can reduce the radiation dose of equipment installers; The armored thermocouple in the utility model is always in contact with the outer wall of the measured pipe, with less heat loss and high temperature monitoring accuracy; The impact on the thermal insulation structure of the tested pipeline during installation; the expansion and contraction of the telescopic tube assembly of the device can reach 50%, so that it can meet the requirements of on-site maintenance.

Description of drawings

Accompanying drawing 1 is the schematic diagram of mixing hot and cold fluids when the fluid velocity is higher in the background technology of the utility model;

Accompanying drawing 2 is the schematic diagram of mixing hot and cold fluids when the fluid velocity is low in the background technology of the utility model;

Accompanying drawing 3 is the structural representation of the temperature measuring device of the present utility model;

Accompanying drawing 4 is the side view of accompanying drawing 3;

Accompanying drawing 5 is the partial enlarged view of place A in accompanying drawing 4;

Accompanying drawing 6 is the structure diagram that armored thermocouple is arranged on the steel belt in the utility model.

in,

1. Temperature measurement component; 101. Armored thermocouple; 102. Steel strip; 103. Hook; 104. Buckle; 105. Concave groove; 106. Support piece; 107. Screw; 108. Adjusting nut; 2. 3. Cable wire; 4. Protective sleeve assembly; 401. Outlet tube; 402. Sleeve; 5. Telescopic tube assembly; 501. First protective tube; 502. Second protective tube; 6. First connector Components; 601, the first pipe joint; 602, the first fastening assembly; 7, the second joint assembly; 701, the second pipe joint; 702, the second fastening assembly; 8, the wire hoop.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figures 3 to 6, a conveniently installed nuclear power plant pipeline temperature measurement device includes a temperature measurement component 1, the temperature measurement component 1 includes a steel strip 102 sleeved on the outer wall of the pipeline 2 to be tested, and steel strips 102 arranged at intervals. The armored thermocouple 101 on the belt 102, the measuring end of the armored thermocouple 101 penetrates the through hole on the steel belt 102 and sticks to the outer wall of the measured pipeline 2, and the cable wire electrically connected to the armored thermocouple 101 3 is electrically connected to the thermal fatigue monitoring system through the protective sleeve 402 component 4 and the telescopic tube component 5 in turn.

Both ends of the steel strip 102 are fixed by snap-fit components. The engaging assembly includes a hook 103 disposed at the first end of the steel belt 102 and a matching buckle 104 disposed at the second end of the steel belt 102 . In this embodiment, the second end of the steel strip 102 is provided with a concave groove 105, and the buckle 104 is connected with the adjustment assembly. 107 and an adjusting nut 108 sheathed on one end of the screw rod 107 , the buckle 104 is connected with the other end of the screw rod 107 . The buckle 104 is fastened to the hook 103 , and the degree of tightness of the steel strip 102 on the pipe 2 to be tested can be adjusted accordingly by adjusting the nut 108 .

The protective sleeve 402 assembly 4 includes a lead-out tube 401 connected to the outer wall of the steel belt 102 for the cable 3 to pass through, and a rotatable sleeve 402 sleeved outside the lead-out tube 401 , and the lead-out tube 401 is fixedly connected to the steel belt 102 , The lead-out pipe 401 and the casing 402 are fitted with perforations for the cables 3 to pass through.

In this embodiment, the lead-out pipe 401 is provided with a first hole, and the sleeve 402 is provided with a second hole. The sleeve 402 has a first working position and a second working position. When the sleeve 402 is located at the first working position, The first hole of the lead-out tube 401 and the second hole of the sleeve 402 cooperate to form a perforation for the cable 3 to pass through; when the sleeve 402 rotates to the second working position, the first hole and the second hole are staggered. Before the cable 3 is passed into the outlet pipe 401, the sleeve 402 is first rotated to the first working position, and after the cable 3 is passed through the hole, the sleeve 402 is rotated to the second working position.

The telescopic tube assembly 5 includes a first protection tube 501 and a second protection tube 502 connected to the first protection tube 501. The first protection tube 501 can slide and stretch along the second protection tube 502 and is connected to the second protection tube 502. The first The outer diameter of the protection tube 501 is smaller than the inner diameter of the second protection tube 502, and the first protection tube 501 is inserted into the second protection tube 502 to achieve shrinkage.

One end of the first protection tube 501 is connected to the bushing 402 through the first joint assembly 6 ; the other end of the first protection tube 501 is connected to the second protection tube 502 through the second joint assembly 7 . As shown in FIG. 3 , the first joint assembly 6 includes a first pipe joint 601 sleeved on the ends of the casing 402 and the first protection tube 501 and a first fastening assembly 602 for fixing them. The second joint assembly 7 includes a second joint joint 701 sleeved on the ends of the first protection tube 501 and the second protection tube 502 and a second fastening component 702 for fixing them. The first fastening assembly 602 and the second fastening assembly 702 in this embodiment are fastening bolts, and the fastening bolts penetrate in the radial direction of the first pipe joint 601/second pipe joint 701 and abut against the One pipe joint 601/the second pipe joint 701 inside the pipe, so as to realize fastening.

When the equipment is in the overhaul state, it is only necessary to loosen the second fastening assembly 702 on the second pipe joint 701, and push the first protection tube 501 into the second protection tube 502 to realize the connection with the armored thermocouple 101 The overhaul of cable wire 3, the stretch rate in the present embodiment can reach 50%.

In order to realize multi-point measurement, there are multiple armored thermocouples 101 , and all the armored thermocouples 101 are arranged on the surface of the steel strip 102 at intervals, and the cables 3 and the steel strip 102 are fixed by wire hoops 8 .

The temperature measuring device of the utility model has the advantages of simple structure, high reliability, convenient installation and disassembly, and can reduce the radiation dose of equipment installers. Through the thermal fatigue monitoring system connected with the armored thermocouple 101, the measured pipeline can be monitored 2’s real fatigue state, reasonably excavate the safety margin of its fatigue design, and provide real data support for the periodic safety review of nuclear power plants or life extension of nuclear power plants. At the same time, it can also: optimize the operating procedures and in-service inspection programs based on the actual damage state; Provide designers with real power plant transient data benchmarks for power plant optimization and readjustment; provide data support for evaluating the structural integrity of pressure boundaries after unexpected events occur.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and not to limit the protection scope of the present utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (10)

1. The utility model provides a nuclear power plant pipeline temperature measuring device of convenient installation which characterized in that: including the temperature measurement subassembly, the temperature measurement subassembly is laid including the steel band and the interval that the cover was established on being surveyed the pipeline outer wall armor thermocouple on the steel band, the measuring end of armor thermocouple penetrates through-hole on the steel band and with the outer wall of being surveyed the pipeline pastes mutually, with the cable conductor that armor thermocouple looks electricity is connected loops through protection sleeve subassembly and telescopic tube subassembly and thermal fatigue monitoring system electricity is connected.

2. The conveniently-installed nuclear power plant pipeline temperature measuring device of claim 1, wherein: the two ends of the steel belt are fixed through the clamping components.

3. The conveniently installed nuclear power plant pipeline temperature measuring device of claim 2, wherein: the clamping component comprises a clamping hook arranged at the end part of the first end of the steel belt and a buckle arranged at the end part of the second end of the steel belt in a matched mode.

4. The conveniently-installed nuclear power plant pipeline temperature measuring device of claim 3, wherein: the second end tip of steel band is equipped with the concave groove, the buckle links to each other with the adjustment subassembly, the adjustment subassembly is including erectting support piece in the concave groove, with support piece threaded connection's screw rod and cover are established the adjusting nut of screw rod one end, the buckle with the other end of screw rod links to each other.

5. The conveniently-installed nuclear power plant pipeline temperature measuring device of claim 1, wherein: the protective sleeve component comprises an outlet pipe connected with the outer wall of the steel belt and used for the cable to penetrate through, and a sleeve rotatably sleeved on the outer side of the outlet pipe, wherein the outlet pipe and the sleeve are provided with through holes for the cable to penetrate through in a matched mode.

6. The conveniently-installed nuclear power plant pipeline temperature measuring device of claim 5, wherein: the leading-out pipe is provided with a first hole, the sleeve is provided with a second hole, the sleeve is provided with a first working position and a second working position, and when the sleeve is positioned at the first working position, the first hole of the leading-out pipe and the second hole of the sleeve are combined to form the through hole for the cable to penetrate; when the sleeve rotates to the second working position, the first hole and the second hole are staggered.

7. The conveniently installed nuclear power plant pipeline temperature measuring device of claim 5 or 6, wherein: the telescopic pipe assembly comprises a first protection pipe and a second protection pipe connected with the first protection pipe, and the first protection pipe can slide, stretch and contract along the second protection pipe and is connected with the second protection pipe.

8. The conveniently installed nuclear power plant pipeline temperature measuring device of claim 7, wherein: one end of the first protection pipe is connected with the sleeve through a first joint component; the other end of the first protection pipe is connected with the second protection pipe through a second joint component.

9. The conveniently installed nuclear power plant pipeline temperature measuring device of claim 8, wherein: the first joint component comprises a first connecting pipe joint sleeved at the end parts of the sleeve and the first protection pipe and a first fastening component used for fixing the first connecting pipe joint; the second joint assembly comprises a second connecting pipe joint sleeved on the end parts of the first protection pipe and the second protection pipe and a second fastening assembly used for fixing the second connecting pipe joint.

10. The conveniently-installed nuclear power plant pipeline temperature measuring device of claim 1, wherein: the armored thermocouples are arranged on the surface of the steel belt at intervals, and the cable is fixed with the steel belt through a wire hoop.