CN104569160A - Device for detecting inner leakage of high-temperature valve - Google Patents

Abstract

The invention discloses a device for detecting internal leakage of a high-temperature valve, which comprises a waveguide rod fixer, wherein one surface of the waveguide rod fixer is fixedly connected with a detection point on the outer surface of the valve, the other surface of the waveguide rod fixer is connected with one end of a waveguide rod, and the other end of the waveguide rod is connected with an acoustic emission sensor; the waveguide rod is a threaded rod, and the waveguide rod fixer is provided with a threaded hole matched with the threads of the waveguide rod. The invention uses the acoustic emission leak detection method for detecting the internal leakage of the high-temperature valve, the wave guide rod, the external thread and the movable radiating fins matched with the wave guide rod and the external thread in the device increase the radiating area, and the number of the radiating fins can be increased or decreased, so that the high temperature of the valve can be quickly reduced to the proper detection temperature range of the acoustic emission sensor at the other end of the wave guide rod. Through careful design, the heat dissipation area of the whole detection device reaches an optimized balance range, accurate measurement can be guaranteed, miniaturization and convenience of the whole heat dissipation structure are guaranteed to the greatest extent, transmission sound signals are reduced, and measurement accuracy is high.

Description

A kind of device for high temperature valve inner hexagon

Technical field

The present invention relates to a kind of component of machine Performance Detection field, particularly a kind of device for high temperature valve inner hexagon.

Background technology

Valve is in fluid system, be used for controlling the device of the direction of fluid, pressure, flow, medium in pipe arrangement and equipment (liquid, gas, powder) is flowed or stops and its flow can be controlled, there is the functions such as water conservancy diversion, cut-off, throttling, non-return, shunting or overflow release.When leaking in valve occurs, not only can cause the reduction of economy and the loss of working medium, the serious valve of interior leakage also to pipeline generation erosion corrosion after valve, can make trommel, causes potential safety hazard or accident.

Acoustic emission inner hexagon instrument is the core apparatus that valves leakage detects, and forms primarily of sensor, prime amplifier, mainframe box and computing machine.Acoustic emission detection process arrives the surface of material by the elastic wave propagation that acoustic emission source is launched, cause the surface displacement that can detect with calibrate AE sensor, the mechanical vibration of material are converted to electric signal by sensor probe, and then be exaggerated by prime amplifier, mainframe box carries out processing and record, and computing machine shows.

The accuracy of detection of acoustic emission inner hexagon instrument is limited to the temperature of sensor.At present, calibrate AE sensor is scarcely high temperature resistant, and the situation that existing valve is in the factory high-temperature medium gets more and more, the solution of prior art adopts high-temperature coupling agent to carry out high temperature isolation, but due to high-temperature coupling agent and valve body material difference excessive, therefore Detection results is unsatisfactory, and this just causes difficulty to the inner hexagon of high temperature valve or testing result error is larger.

Therefore, be necessary to improve for above-mentioned technical matters, overcome the difficulty in detection.

Summary of the invention

Goal of the invention: technical matters to be solved by this invention is for the deficiencies in the prior art, provides a kind of device for high temperature valve inner hexagon.

In order to solve the problems of the technologies described above, the invention discloses a kind of device for high temperature valve inner hexagon, it is characterized in that, comprise waveguide rod fixator that one side is fixedly connected with valve exterior surface check point, the another side of waveguide rod fixator is connected one end of waveguide rod, the other end connecting acoustic emission sensor of waveguide rod; Waveguide rod is threaded rod, and waveguide rod fixator is provided with the screw thread mouth with the threaded adapter of described waveguide rod.

What described waveguide rod was fixing is provided with hold-doun nut.Described hold-doun nut outer ring is hexagonal or square shape, and can be integrated machine-shaping with waveguide rod also can be use nut to carry out secondary to be fixedly connected with.

Described waveguide rod is provided with mobilizable heat radiator, and heat radiator is provided with the screw thread mouth with the threaded adapter of described waveguide rod.Heat radiator can be set to one, or two or more.Described heat radiator can be open column sheet, and outside surface is right cylinder or polygonized structure.Heat radiator can move in waveguide rod.

Described high temperature valve is that interior media working temperature is greater than 425 DEG C; Described waveguide rod fixator can adopt hexagonal nut.Described heat radiator is hollow cylinder sheet, and endoporus is provided with internal thread.Described waveguide rod fixator and waveguide rod, for being threaded, by tightening waveguide rod, can make it and high temperature valve close contact.

Waveguide rod test lead temperature T meets following formula:

T＝245.64935-0.25961T ₀-213.02217A，

T ₀for valve temperature, A is area of dissipation;

The area of dissipation A design of waveguide rod meets following formula:

$A=\mathrm{\η}\frac{\mathrm{\π}[\mathrm{DL}+n(\frac{{d_0}^2}{2}+d_{0}t-\mathrm{Dt})]}{{10}^6},$

Wherein, L is the length of waveguide rod, D is the diameter of waveguide rod, and t is thickness, the d of the heat radiator of waveguide rod ₀for the external diameter of the heat radiator of waveguide rod, for the quantity n of the heat radiator of waveguide rod, η are surface area coefficient, L/D gets 8 ~ 10, L and gets 300 ~ 400mm.

Valve temperature (T ₀/ DEG C), the length (L/mm) of waveguide rod, diameter (D/mm), test lead temperature (T/ DEG C), the quantity (n/ sheet) of heat radiator, thickness (t/mm), external diameter (d ₀/ mm), area of dissipation (A/m ²), surface area coefficient η gets 1.24.

Thermal conduction rate q ₁-----heat conduction rate W, λ------coefficient of heat conductivity W/mK, A ₁------heat conducting cross-sectional amasss m ²; t ₁, t ₂------temperature end, the long m of low-temperature end temperature K, L------waveguide rod.From heat transfer formula, the waveguide rod two ends temperature difference is larger, L/R ²less, heat conduction rate is larger.By the temperature lowering effect of the various different length-diameter ratio waveguide rod of finite element analogy, when length-diameter ratio span is between 8 ~ 10, length range is when 300 ~ 400mm, waveguide rod test lead temperature can drop to less than 80 DEG C, detect substantially identical with analog result through reality, can coincidence senser probe temperature.

Thermal convection heat exchange amount Q ₂=α (t _w-t _f) A ₂, Q ₂-----the quantity of heat convection W, t _w, t _fthe medial temperature DEG C of-----wall and fluid, α-----convection transfer rate W/ (m ²dEG C), A ₂------convection heat transfer area m ².From thermal convection formula, convection heat transfer area A ₂larger, heat exchange amount is larger.The heat interchanging area of waveguide rod comprises threaded rod and heat radiator two parts, is hexagonal block and waveguide rod is screw-type in the middle part of waveguide rod in this patent, therefore adopts the method for surface area coefficient η to obtain total equivalent heat interchanging area to be: $A=\mathrm{\η}\frac{\mathrm{\π}[\mathrm{DL}+n(\frac{{d_0}^2}{2}+d_{0}t-\mathrm{Dt})]}{{10}^6}.$

According to the measured data of table 1, obtain test lead temperature T=245.64935-0.25961T by Origin fitting of a polynomial ₀-213.02217A, the relative coefficient of this formula is that 0.9596, t is up to the standards.

Table 1 measured data table

Sequence number	1	2	3	4	5	6	7	8	9	10	11	12
													T 0/℃	600	600	600	600	600	600	600	600	600	600	600	600
L/mm	200	225	250	275	300	325	350	375	400	425	450	475
													D/mm	20	25	30	35	40	45	20	25	30	35	40	45
N/ sheet	0	1	2	0	1	2	0	1	2	0	1	2
													t/mm	0	10	10	0	15	15	0	20	20	0	25	25
d 0/mm	70	70	70	75	75	75	80	80	80	85	85	85
													A/m 2	0.0156	0.0335	0.0513	0.0372	0.060	0.0823	0.0273	0.0533	0.0794	0.0579	0.0885	0.1192
T/℃	98.78	95.26	88.04	85.36	78.57	74.51	92.15	88.54	85.32	87.65	70.43	61.23

Beneficial effect: acoustic emission leak hunting method is used for the inner hexagon of high temperature valve by the present invention, waveguide rod in device, external thread and the movable type radiation sheet be mated add area of dissipation, and heat radiator quantity changeable, can fast the high temperature of valve be dropped within the scope of the suitable detected temperatures of calibrate AE sensor at the waveguide rod other end.By meticulous design, the area of dissipation of the whole pick-up unit being reaches an optimized range of balance, can either ensure accurate measurement, ensure the miniaturization that whole radiator structure is tried one's best simultaneously, facilitation, make the acoustical signal transmitted decay little, measuring accuracy is high.

Accompanying drawing explanation

To do the present invention below in conjunction with the drawings and specific embodiments and further illustrate, above-mentioned and/or otherwise advantage of the present invention will become apparent.

Fig. 1 is the schematic diagram of waveguide rod for high temperature valve inner hexagon.

Fig. 2 is the vertical view of waveguide rod fixator.

Fig. 3 is the front view of waveguide rod.

Fig. 4 is the longitudinal section of heat radiator.

Embodiment

As shown in Figure 1, the invention discloses a kind of device for high temperature valve inner hexagon, comprise high temperature valve 1, waveguide rod fixator 2, waveguide rod 4, calibrate AE sensor 6, described high temperature valve is that interior media working temperature is greater than 425 DEG C; Described waveguide rod fixator 2 is hexagonal nut; Described waveguide rod 4 is solid of revolution, the heat radiator 5 being provided with hexagon head, external thread and being mated; Described hexagon head 3 is positive hexahedron; Described heat radiator 5 is hollow cylinder sheet, and endoporus is provided with internal thread.Calibrate AE sensor 6 connects prime amplifier 7, mainframe box 8 and computing machine 9 successively.

As shown in Figure 2, waveguide rod fixator 2 is a hexagonal (hexagon)nut, can be welded and fixed during use with high-temperature valves 1.

As shown in Figure 3, waveguide rod 4 is divided into three sections: left section of screw thread, hexagon head 3, right section of screw thread.Left section is connected with waveguide rod fixator 2; Hexagon head 3 tightens for the ease of spanner, makes waveguide rod 4 and high temperature valve 1 reach close contact; Right section is connected by couplant with heat radiator 5 and calibrate AE sensor 6.

As shown in Figure 4, heat radiator is hollow cylinder sheet, and endoporus is provided with internal thread.

Embodiment

Waveguide rod overall length 400mm in the present embodiment, left segment length 60mm, hexagonal head height 20mm, right section of 320mm; Waveguide rod diameter is 40mm, and diameter of thread is 35mm, and hexagon head circumscribed circle diameter is 60mm, high 20mm; Heat radiator overall diameter 80mm; High temperature valve temperature is 600 DEG C.

In the present embodiment waveguide rod and air surface of contact on apply convection transfer rate 15W/ (m ²k), four adjacent spacing of heat radiator are 40mm, first fin pitch hexagon head 30mm.The acoustic emission detector adopted is SWU2S Full wave shape acoustic emission detector, and sensor model number is SRI40, and working temperature is-20 ~ 50 DEG C.Steady state heat transfer, the temperature that can obtain waveguide rod and calibrate AE sensor contact jaw is 42.9 DEG C, within the scope of senor operating temperature.

The invention provides a kind of device for high temperature valve inner hexagon; the method and access of this technical scheme of specific implementation is a lot; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.The all available prior art of each ingredient not clear and definite in the present embodiment is realized.

Claims (4)

1. the device for high temperature valve inner hexagon, it is characterized in that, comprise waveguide rod fixator that one side is fixedly connected with valve exterior surface check point, the another side of waveguide rod fixator is connected one end of waveguide rod, the other end connecting acoustic emission sensor of waveguide rod; Waveguide rod is threaded rod, and waveguide rod fixator is provided with the screw thread mouth with the threaded adapter of described waveguide rod.

2. device according to claim 1, is characterized in that, what described waveguide rod was fixing is provided with hold-doun nut.

3. device according to claim 1, is characterized in that, described waveguide rod is provided with mobilizable heat radiator, and heat radiator is provided with the screw thread mouth with the threaded adapter of described waveguide rod.

4. device according to claim 1, is characterized in that, waveguide rod test lead temperature T meets following formula:

T＝245.64935-0.25961T ₀-213.02217A，

T ₀for valve temperature, A is area of dissipation;

The area of dissipation A design of waveguide rod meets following formula:

$A=\mathrm{\η}\frac{\mathrm{\π}[\mathrm{DL}+n(\frac{{d_0}^2}{2}+d_{0}t-\mathrm{Dt})]}{{10}^6},$

Wherein, L is the length of waveguide rod, D is the diameter of waveguide rod, and t is thickness, the d of the heat radiator of waveguide rod ₀for the external diameter of the heat radiator of waveguide rod, for the quantity n of the heat radiator of waveguide rod, η are surface area coefficient, L/D gets 8 ~ 10, L and gets 300 ~ 400mm.