CN214622445U

CN214622445U - Be used for condenser heat exchange tube eddy current testing simulation test block

Info

Publication number: CN214622445U
Application number: CN202120385238.6U
Authority: CN
Inventors: 姚子龙; 唐池; 胡丽平
Original assignee: Shenzhen Zhongchang Detection Technology Co ltd
Current assignee: Shenzhen Zhongchang Detection Technology Co ltd
Priority date: 2021-02-20
Filing date: 2021-02-20
Publication date: 2021-11-05
Anticipated expiration: 2031-02-20

Abstract

The utility model discloses a be used for condenser heat exchange tube eddy current testing simulation test block, the pipeline comprises a pipe, be equipped with a plurality of evenly distributed's first hole groove on the outer wall of pipeline, the degree of depth in first hole groove increases gradually, and is adjacent the degree of depth difference in first hole groove is the same, be equipped with a plurality of evenly distributed's second hole groove on the inner wall of pipeline, the degree of depth in second hole groove increases gradually, and is adjacent the degree of depth difference in second hole groove is the same, first hole groove with the degree of depth in second hole groove all is less than the wall thickness of pipeline, be equipped with the solid fixed ring with it relative slip on the pipeline, this device can be through designing the eddy current testing simulation test block, is convenient for simulate and observe the different corrosion conditions of test block.

Description

Be used for condenser heat exchange tube eddy current testing simulation test block

Technical Field

The utility model relates to a detection device, in particular to be used for condenser heat exchange tube eddy current testing simulation test block.

Background

The condenser is a heat exchanger for condensing the exhaust steam of the steam turbine into water, and is also called a water re-condenser. The condenser is mainly used in a steam turbine power device and is divided into a water-cooling condenser and an air-cooling condenser. The condenser can condense the exhaust steam of the turbine into water for reuse by the boiler, and can establish vacuum and maintain the vacuum at the exhaust steam part of the turbine. The different condensers according to the steam condensation mode can be divided into a surface type (also called dividing wall type) and a mixed type (also called contact type). In a surface condenser, steam separated from a cooling medium is condensed into liquid on a cooling wall surface (usually, a metal pipe). The cooling medium can be water or air, most of the cooling medium for the thermal power plant at present is water, and the water-cooled surface condenser mainly comprises a shell, a tube bundle, a hot well, a water chamber and the like. The exhaust steam of the steam turbine enters the shell through the throat part, is condensed into water on the cooling pipe bundle and is collected in the hot well, and is pumped out by the condensate pump. Cooling water (also called circulating water) enters the cooling tube bundle from the inlet water chamber and is discharged from the outlet water chamber. In order to ensure that high vacuum and good heat transfer effect are maintained in the condenser when steam is condensed, the condenser is also provided with air extraction equipment which continuously extracts air and other non-condensed gases which leak into the condenser.

Condensing steam turbines are typical steam turbines widely used in modern thermal power plants. The condensing equipment is an important component of a steam turbine device, and the economical efficiency and the safety of the steam turbine device are directly influenced by the advantages and disadvantages of the design, manufacture and operation quality of the condensing equipment.

The condenser is used as one of necessary devices of the unit thermodynamic cycle, and mainly has the functions of condensing the exhaust steam of the low-pressure cylinder of the steam turbine into condensed water, and the condensed water is pumped out by a condensed water pump and then is used as a thermodynamic cycle medium. A plurality of heat transfer tube bundles are arranged in the condenser, circulating water flows in the tube bundles, and the phenomenon of leakage of titanium tubes of the condenser frequently occurs in the operation process due to poor quality of the circulating water, mechanical impact and the like. When the titanium pipe of the condenser leaks, an operator should immediately take measures such as putting into operation for condensate fine treatment, isolating a leaked condenser water chamber and the like so as to prevent the safe operation of equipment such as an evaporator and the like from being influenced by the quality deterioration of the water in the whole two-loop. The condenser is an important device for condensing the exhaust steam of the low-pressure cylinder of the steam turbine into water so as to be used as a medium of thermodynamic cycle. The condenser is generally transversely arranged at the lower part of a low-pressure cylinder, a condenser shell is arranged on a spring support, and the upper part of the condenser shell is rigidly connected with a steam turbine exhaust cylinder. Circulating water flows through the condenser tube bundle to condense steam turbine exhaust in the condenser shell, and condensed water is collected in the hot well and is discharged by the condensed water pump.

Eddy current testing is a conventional non-destructive testing method based on studying the relationship between eddy current and test piece. The eddy current test has the main advantages of high detection speed, no direct contact between the coil and the test piece and no need of couplant. The main disadvantage is that the test piece is only limited to conductive materials and is difficult to check for a test piece with a complex shape. The supporting plates for fixing the tube bundles are arranged at certain positions in the tube bundles of the condenser, so that the judgment of defects in eddy current detection can be influenced, and the identification of end benefit interference defect signals can be formed for fillet welds of the tube plates at the ends of the tube bundles.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned current problem, the utility model discloses the technical problem that solve lies in can be through design eddy current testing simulation test block, be convenient for simulate and observe one kind of the different corrosion conditions of test block be used for condenser heat exchange tube eddy current testing simulation test block.

The utility model provides a be used for condenser heat exchange tube eddy current testing simulation test block, the pipeline comprises a pipe, be equipped with a plurality of evenly distributed's first hole groove on the outer wall of pipeline, the degree of depth in first hole groove increases gradually, and is adjacent the degree of depth difference in first hole groove is the same, be equipped with a plurality of evenly distributed's second hole groove on the inner wall of pipeline, the degree of depth in second hole groove increases gradually, and is adjacent the degree of depth difference in second hole groove is the same, first hole groove with the degree of depth in second hole groove all is less than the wall thickness of pipeline, be equipped with the solid fixed ring with it relative slip on the pipeline.

Preferably, a plurality of first through holes which are uniformly distributed are arranged on the pipeline.

Preferably, the distance between the end of the pipe and the first through hole farthest from the end of the pipe is 100 mm.

Preferably, the pipeline is provided with a second through hole.

Preferably, the fixing ring is provided with a screw hole, and a bolt in threaded connection with the screw hole is arranged in the screw hole.

Preferably, the first hole groove and the second hole groove are both flat-bottomed.

Preferably, the second through hole is located in the middle of the pipe.

The beneficial effects of the utility model reside in that:

the utility model discloses a be used for condenser heat exchange tube eddy current testing simulation test block, through inciting somebody to action gu fixed ring is in the pipeline removes, when removing to the difference first hole groove or behind the second hole groove department, can observe through the eddy current testing system first hole groove or the defect signal impedance picture of second hole groove department to can be used for simulating the defect corrosion severity of the annular support piece department of condenser periphery, then can also make the defect signal observation of annular support piece department easier through mixing operation, thereby effectively improve detection efficiency and realize the simulation and simulation work.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.

Fig. 1 is the utility model relates to a whole structure chart after the pipeline that is used for condenser heat exchange tube eddy current testing simulation test block is cut open.

In the figure, 1 is a pipeline, 2 is a first hole groove, 3 is a second hole groove, 4 is a fixing ring, 5 is a first through hole, 6 is a second through hole, 7 is a screw hole, and 8 is a bolt.

Detailed Description

In order to better understand the technical content of the present invention, the following embodiments are provided, and the present invention is further described with reference to the accompanying drawings.

Referring to fig. 1, the utility model provides a simulation test block for eddy current testing of heat exchange tubes of a condenser, which comprises a pipeline 1, a plurality of first hole grooves 2 which are uniformly distributed are arranged on the outer wall of the pipeline 1, the depth of the first hole grooves 2 is gradually increased, the depth difference of the adjacent first hole grooves 2 is the same, a plurality of second hole grooves 3 which are uniformly distributed are arranged on the inner wall of the pipeline 1, the depth of the second hole grooves 3 is gradually increased, the depth difference of the adjacent second hole grooves 3 is the same, the depth of the first hole grooves 2 and the depth of the second hole grooves 3 are both smaller than the wall thickness of the pipeline 1, a fixing ring 4 which slides relative to the pipeline 1 is arranged on the pipeline 1, and by moving the fixing ring 4 to the pipeline 1, when the pipeline moves to different first hole grooves 2 or the second hole grooves 3, a defect signal impedance diagram of the first hole grooves 2 or the second hole grooves 3 can be observed through an eddy current testing system, therefore, the defect corrosion severity degree of the annular support piece at the periphery of the condenser can be simulated, and then the defect signal at the annular support piece can be observed more easily through frequency mixing operation, so that the detection efficiency is effectively improved, and the simulation operation is realized.

Specifically, be equipped with a plurality of evenly distributed's first through-hole 5 on pipeline 1, the tip and the distance of pipeline 1 the tip farthest department of pipeline 1 the distance is 100mm between the first through-hole 5, through the effect of first through-hole 5 can conveniently be used for evaluating eddy current testing system's tip blind area distance, ensures follow-up detection achievement's accuracy.

Specifically, be equipped with second through-hole 6 on pipeline 1, through second through-hole 6's effect can avoid the condition emergence that signal interference appears in the testing process to a certain extent.

Specifically, gu be equipped with screw 7 on the fixed ring 4, be equipped with screw thread connection's bolt 8 with it in the screw 7, through gu on the fixed ring 4 screw 7 with cooperation between the bolt 8 can with gu fixed ring 4 better with pipeline 1 is together fixed, avoids appearing rocking the phenomenon.

Specifically, the first hole groove 2 and the second hole groove 3 are both flat-bottomed.

Specifically, the second through hole 6 is located in the middle of the pipe 1.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a be used for condenser heat exchange tube eddy current testing simulation test block, a serial communication port, the pipeline is included, be equipped with a plurality of evenly distributed's first hole groove on the outer wall of pipeline, the degree of depth in first hole groove increases gradually, and is adjacent the degree of depth difference in first hole groove is the same, be equipped with a plurality of evenly distributed's second hole groove on the inner wall of pipeline, the degree of depth in second hole groove increases gradually, and is adjacent the degree of depth difference in second hole groove is the same, first hole groove with the degree of depth in second hole groove all is less than the wall thickness of pipeline, be equipped with relative gliding solid fixed ring with it on the pipeline.

2. The eddy current testing simulation test block for the heat exchange tube of the condenser as recited in claim 1, wherein a plurality of first through holes are uniformly distributed on the tube.

3. The simulation test block for the eddy current testing of the heat exchange tube of the condenser as recited in claim 2, wherein the distance between the end of the tube and the first through hole farthest from the end of the tube is 100 mm.

4. The eddy current testing simulation test block for the heat exchange tube of the condenser as recited in claim 1, wherein the tube is provided with a second through hole.

5. The eddy current testing simulation test block for the heat exchange tube of the condenser as recited in claim 1, wherein the fixing ring is provided with a screw hole, and a bolt in threaded connection with the screw hole is arranged in the screw hole.

6. The eddy current testing simulation test block for the heat exchange tube of the condenser as recited in claim 1, wherein the first hole groove and the second hole groove are both flat-bottomed.

7. The eddy current testing simulation test block for the heat exchange tube of the condenser as recited in claim 4, wherein the second through hole is located in the middle of the tube.