CN104913715A - Tube wall thickness measurement module and tube wall thickness measurement method employing the same - Google Patents

Tube wall thickness measurement module and tube wall thickness measurement method employing the same Download PDF

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Publication number
CN104913715A
CN104913715A CN201410128848.2A CN201410128848A CN104913715A CN 104913715 A CN104913715 A CN 104913715A CN 201410128848 A CN201410128848 A CN 201410128848A CN 104913715 A CN104913715 A CN 104913715A
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China
Prior art keywords
contact
wall thickness
pipe thickness
measurement module
tube
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CN201410128848.2A
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CN104913715B (en
Inventor
郭泰良
冯克林
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Industrial Technology Research Institute ITRI
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Industrial Technology Research Institute ITRI
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Abstract

Provided are a tube wall thickness measurement module and a tube wall thickness measurement method employing the same. The tube wall thickness measurement module comprises a measurement unit set, a power supply device, a voltage measurement unit and wall thickness analysis unit. The measurement unit comprises a first contact, a second contact, a third contact and a fourth contact. The power supply device is used for supplying current for the measurement unit set, wherein the current is inputted from one selected from the group of the first contact, the second contact, the third contact and the fourth contact, and is outputted from another selected from the group of the first contact, the second contact, the third contact and the fourth contact; the voltage measurement unit is used for measuring the voltage difference between another two selected from the group of the first contact, the second contact, the third contact and the fourth contact. The wall thickness analysis unit calculates the local wall thickness value of a contact tube according to the voltage difference.

Description

Pipe thickness measurement module and apply its pipe thickness measuring method
Technical field
The present invention relates to a kind of pipe thickness measurement module and apply its pipe thickness measuring method, and measure the pipe thickness measurement module of the wall thickness of contact tube in particular to a kind of and apply its pipe thickness measuring method.
Background technology
Pipe fitting can transmitting fluid, and it can be applicable to the fields such as nuclear energy, refrigerating and air conditioning, the vehicles.When inside pipe fitting transmission high temperature, high pressure or acrid fluid, the permanance of pipe fitting is tested.Generally speaking, be all after leaking, just to find that pipe fitting produces thinning or breakage, but, occur because leak, the danger corresponding to therefore inevitably producing and maintenance cost.
Summary of the invention
The present invention relates to a kind of pipe thickness measurement module and apply its pipe thickness measuring method, pipe fitting variation in thickness can be monitored.
According to one embodiment of the invention, a kind of pipe thickness measurement module is proposed.Pipe thickness measurement module is in order to measure the local wall thickness of a contact tube.Pipe thickness measurement module comprises a measuring unit group, a power supply unit, a voltage measurement unit and a wall thickness analytic unit.Measuring unit group comprises one first contact, one second contact, one the 3rd contact and one the 4th contact.Power supply unit is in order to supply an electric current to measuring unit group, and wherein electric current inputs from the first contact, the second contact, the 3rd contact and the 4th contact, and exports from another of the first contact, the second contact, the 3rd contact and the 4th contact.Voltage measurement unit other one first voltage difference therebetween in order to measure the first contact, the second contact, the 3rd contact and the 4th contact.Wall thickness analytic unit calculates a local wall thickness value of contact tube according to the first voltage difference.
According to another embodiment of the present invention, a kind of pipe thickness measuring method is proposed.Pipe thickness measuring method comprises the following steps.There is provided a pipe thickness measurement module in contact tube, wherein pipe thickness measurement module comprises a measuring unit group, and measuring unit group comprises one first contact, one second contact, one the 3rd contact and one the 4th contact; Supply an electric current to measuring unit group, wherein electric current inputs from the first contact, the second contact, the 3rd contact and the 4th contact, and exports from another of the first contact, the second contact, the 3rd contact and the 4th contact; Other one first voltage difference therebetween measuring the first contact, the second contact, the 3rd contact and the 4th contact; And, a local wall thickness value of contact tube is calculated according to the first voltage difference.
In order to have better understanding to above-mentioned and other aspect of the present invention, preferred embodiment cited below particularly, and coordinating accompanying drawing, being described in detail below:
Accompanying drawing explanation
Fig. 1 illustrates the pipe thickness measuring method process flow diagram according to one embodiment of the invention.
Fig. 2 pipe thickness measurement module illustrated according to one embodiment of the invention is layed in the schematic diagram of contact tube.
Fig. 3 illustrates the schematic diagram of the second contact input inverse current from Fig. 2.
Fig. 4 illustrates the graph of a relation of average electrical pressure reduction according to one embodiment of the invention and thickness of pipe.
Fig. 5 illustrates the measuring unit group of Fig. 2 and the partial sectional view of contact tube.
Fig. 6 illustrates the schematic diagram of the pipe thickness measuring method according to another embodiment of the present invention.
Fig. 7 illustrates the schematic diagram of the pipe thickness measuring method according to another embodiment of the present invention.
Fig. 8 illustrates the schematic diagram of the pipe thickness measuring method according to another embodiment of the present invention.
Fig. 9 illustrates the pipe thickness measuring method process flow diagram according to another embodiment of the present invention.
Figure 10 A illustrates the schematic diagram of the pipe thickness measurement module according to another embodiment of the present invention.
Figure 10 B illustrates the schematic diagram of the second concurrent contact input inverse current from Figure 10 A.
[symbol description]
10: contact tube
100,200: pipe thickness measurement module
110,110 ', 110 ' ': measuring unit group
111: the first wires
111a: the first contact
112: the second wires
112a: the second contact
113: privates
113a: the three contact
114: privates
114a: the four contact
120: power supply unit
130: voltage measurement unit
140: wall thickness analytic unit
150: switch unit
160: control device
C1: geometric center
D1: curve
I: electric current
L1, L1 ': line
P1, P1 ': location point
S1: circumferential paths
S2: axial path
S110 ~ S194: step
T: local wall thickness value
Δ V1: the first voltage difference
Δ V2: the second voltage difference
Δ Va: average electrical pressure reduction
Embodiment
Fig. 1 illustrates the pipe thickness measuring method process flow diagram according to one embodiment of the invention.
In step S110, referring to Fig. 2, its pipe thickness measurement module illustrated according to one embodiment of the invention is layed in the schematic diagram of contact tube.There is provided pipe thickness measurement module 100, pipe thickness measurement module 100 is layed in the outside wall surface of easy thinning place of contact tube 10, in the outside wall surface as pipe fitting bending part, to measure the local wall thickness of contact tube 10, and then the wall thickness change of monitoring contact tube 10.Pipe thickness measurement module 100 comprises several measuring unit group 110, power supply unit 120, voltage measurement unit 130, wall thickness analytic unit 140, switch unit 150 and control device 160.
In one embodiment, voltage measurement unit 130, wall thickness analytic unit 140 can be integrated into a firmware (firmware) with wantonly two in switch unit 150 or be integrated into an integrated circuit formed by semiconductor technology.In another embodiment, wantonly two of voltage measurement unit 130, wall thickness analytic unit 140 and switch unit 150 can be integrated in control device 160.Control device 160 is electrically connected measuring unit group 110, power supply unit 120, voltage measurement unit 130, wall thickness analytic unit 140 and switch unit 150, controls this little unit with unified.In addition, control device 160 can be the electronic installation of desktop computer, notebook computer, mobile phone, server or other kind.
Each measuring unit group 110 comprises the first wire 111, second wire 112, privates 113 and privates 114, and wherein the first wire 111, second wire 112, privates 113 and privates 114 have the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a respectively.First wire 111, second wire 112, privates 113 and privates 114 are connected in the outside wall surface of contact tube 10 with the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a respectively.In the present embodiment, the first contact 111a, the second contact 112a, the 3rd contact 113a are separated setting with the 4th contact 114a, and namely the first contact 111a, the second contact 112a, the 3rd contact 113a are not directly connected with wantonly two in the 4th contact 114a.
First contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a of each measuring unit group 110 can be arranged in matrix-like (array), rectangular (matrix), or along a polygonal corner arrangement, wherein polygonal rectangle, triangle or rhombus in this way.All measuring unit groups 110 can be arranged in matrix-like or rectangular.As long as can carry out wall thickness measuring, the embodiment of the present invention does not limit the spread pattern of measuring unit group 110 and/or its contact.
In step S120, as shown in Figure 2, power supply unit 120 supplies electric current I to i-th measuring unit group 110 by switch unit 150.Switch unit 150 switch current I inputs from the jth person of the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a, and switch current I exports from another of the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a, wherein i and the j positive integer that is greater than 1, wherein initial value is 1.With measuring unit group 110 ' for example, power supply unit 120 supplies electric current I to the first contact 111a of measuring unit group 110 ', and switch current I exports from the second contact 112a.
In step S130, other voltage difference therebetween that voltage measurement unit 130 measures the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a.With measuring unit group 110 ' for example, voltage measurement unit 130 measures the first voltage difference delta V1 between the 3rd contact 113a and the 4th contact 114a by switch unit 150.Due to the difference of the resistance coefficient of wire (privates 113 and privates 114) and the resistance coefficient of contact tube 10, the first voltage difference delta V1 produces an overgauge ε compared to average electrical pressure differential deltap Va, shown in (1).
ΔV1=ΔVa+ε..........................................................(1)
In step S140, as shown in Figure 3, it illustrates the schematic diagram of the second contact input inverse current from Fig. 2.Power supply unit 120 supplies electric current I to i-th measuring unit group 110 by switch unit 150.Switch unit 150 switch current I inputs from another of the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a, and switch current I exports from the jth person of the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a.For example, switch unit 150 switch current I inputs from the second contact 112a, and switch current I exports from the first contact 111a.
In step S150, voltage measurement unit 130 measures the second voltage difference delta V2 between the 3rd contact 113a and the 4th contact 114a.Due to the difference of the resistance coefficient of wire (privates 113 and privates 114) and the resistance coefficient of contact tube 10, the second voltage difference delta V2 is made to produce a minus deviation ε, shown in (2) compared to the average electrical pressure differential deltap Va of reality.
ΔV2=ΔVa-ε..........................................................(2)
In step S160, as shown in the formula (3), voltage measurement unit 130 calculates an average electrical pressure differential deltap Va of the first voltage difference delta V1 and the second voltage difference delta V2, and this average electrical pressure differential deltap Va gets rid of departure ε.Say further, due to the design of the inverse current of above-mentioned steps S140 and S150, after average first voltage difference delta V1 and the second voltage difference delta V2, obtain the average electrical pressure differential deltap Va of more precisely (comparing the first voltage difference delta V1 and the second voltage difference delta V2), this average electrical pressure differential deltap Va gets rid of the voltage error that the difference because of the resistance coefficient of wire and the resistance coefficient of contact tube 10 causes.
ΔVa = ( ΔV 1 + ΔV 2 ) 2 . . . ( 3 )
In step S170, as shown in Figure 4, it illustrates the graph of a relation of average electrical pressure reduction according to one embodiment of the invention and thickness of pipe.Curve D 1 represents the relation of average electrical pressure differential deltap Va and local wall thickness value t.Curve D 1 can adopt experiment or analogy method to obtain, and it can be stored in wall thickness analytic unit 140.Wall thickness analytic unit 140 removes according to the curve D 1 of Fig. 4 the local wall thickness value t calculating or inquire about the contact tube 10 corresponding to average electrical pressure differential deltap Va.Because average electrical pressure differential deltap Va is more accurate compared to the first voltage difference delta V1 and the second voltage difference delta V2, the local wall thickness value t therefore calculating or inquire about according to average electrical pressure differential deltap Va is comparatively accurate.In another embodiment, if the local wall thickness value t calculating with the first voltage difference delta V1 or the second voltage difference delta V2 or inquire about is in range of allowable error, also can under omission step S120 and S130 situation, the average electrical pressure reduction using the second voltage difference delta V2 as Fig. 4 removes the local wall thickness value t calculating or inquire about; Or, can under omission step S140 and S150 situation, the average electrical pressure reduction using the first voltage difference delta V1 as Fig. 4 removes the local wall thickness value t calculating or inquire about.
In another embodiment, step S160 and S170 also can perform between step S190 and S192.That is, after whole contacts all the input current average electrical pressure reduction that also acquisition is corresponding, then step S192 can be entered, wall thickness analysis is carried out to all average electrical pressure reduction.
Due to the electric current of the embodiment of the present invention input, electric current export and voltage difference measure all be confined in the measuring unit group 110 of small size, therefore only need the direct current of low amounts can obtain degree of accuracy and highly sensitive local wall thickness value t, low amounts electric current is wherein such as between 1 to 3 ampere.Because the required magnitude of current is very low, therefore pipe thickness measurement module 100 power consumption of the embodiment of the present invention is low, can save the energy.
When the spacing of the two point of measuring unit group 110 is less, then the required magnitude of current is fewer; Otherwise then the more.When the wall thickness of contact tube 10 is thicker, then the required magnitude of current is fewer; Otherwise then the more.Therefore, determined by the spacing of the two point of measuring unit group 110 and/or the wall thickness of contact tube 10, above-mentioned low amounts electric current also can be less than 1 ampere or be greater than 10 amperes.In one embodiment, the spacing of the two point of measuring unit group 110 can, between 0.1 of the wall thickness of contact tube 10 is times to 10 times, make the required magnitude of current within the scope of low power consumption.
Fig. 5 illustrates the measuring unit group 110 of Fig. 2 and the partial sectional view of contact tube.Above-mentioned local wall thickness value t may be defined to the wall thickness of the optional position point on the line of the two point of average electrical pressure differential deltap Va.With measuring unit group 110 ', local wall thickness value t may be defined to the wall thickness of the optional position point P1 on the line L1 of the 3rd contact 113a and the 4th contact 114a, and the location point P1 of the present embodiment illustrates for the mid point of line L1.First contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a define a geometric configuration, as rectangle.In another embodiment, above-mentioned local wall thickness value t may be defined to the 3rd contact 113a, the 4th contact 114a with should the wall thickness of optional position point P1 ' in the region that surrounds of the geometric center C1 of what shape, the location point P1 ' of the present embodiment is such as the mid point of the line L1 ' of geometric center C1 and location point P1.
In step S180, judge whether each contact input current all of each measuring unit group 110.If so, then step S192 is performed; If not, then step S190 is performed.
In step S190, the numerical value of cumulative i and/or j, and repeat step S120 to S170.In one embodiment, can to after all contacts of same measuring unit group 110 (maintaining i value) sequentially (j=j+1) input current, more all contacts sequentially (j=j+1) input current I to next measuring unit group 110 (i=i+1).In another embodiment, can to after at least one contact of same measuring unit group 110 input current I out of the ordinary, then at least one contact of another measuring unit group 110 input current I out of the ordinary.With regard to electric current input path, can to the sequentially or not sequentially input current I of the contact on a circumferential paths S1 of contact tube 10 (path around the axis of contact tube 10); Or, can to the sequentially or not sequentially input current I of the contact on an axial path S2 of contact tube 10; Or, can to the sequentially or not sequentially input current I of the contact on scanning path, wherein scanning pattern is such as the path (that is, the component be projected on circumferential paths S1 and axial path S2 is not equal to 0) of circumferentially path S1 and axial path S2 extension simultaneously, such as, be sigmoid curve.As long as can to all contacts of each measuring unit group 110 all input current I average electrical pressure reduction that also acquisition is corresponding, the embodiment of the present invention limit the order of electric current I input contact and/or path.
According to above-mentioned steps S120 to S170, when four contacts of a measuring unit group 110 ' are all after input current, the local wall thickness value t of four location point P1 (as shown in Figure 5) can be obtained.After the local wall thickness value t of four location point P1 of each measuring unit group 110 ' obtains, step S192 can be entered.
In step S192, wall thickness analytic unit 140 judge this little local wall thickness value t any one or some whether be less than safe wall thickness value; If have, perform step S194, export a warning message; If not, then repeat step S120 ~ S192, continue the wall thickness change of monitoring contact tube 10.Warning message exports by control device 160 (Fig. 2).Such as, when warning message be a word or color time, control device 160 can comprise a display, to demonstrate warning message; Or when warning message is a sound, control device 160 comprises a voice output device, with the message that gives a warning.In addition, wall thickness analytic unit 140 also can depict all local wall thickness value t as a Thickness Distribution figure, demonstrates this Thickness Distribution figure by the display of control device 160, so that monitoring.
Fig. 6 illustrates the schematic diagram of the pipe thickness measuring method according to another embodiment of the present invention.In the present embodiment, switch unit 150 switch current I inputs from the first contact 111a of measuring unit group 110, and switch current I exports from the 4th contact 114a of measuring unit group 110; Under this design, voltage measurement unit 130 can measure the first voltage difference delta V1 between the second contact 112a and the 3rd contact 113a and the second voltage difference delta V2, and calculating average electrical pressure differential deltap Va according to this, wall thickness analytic unit 140 can go calculating according to the curve D 1 of Fig. 4 or inquire about the local wall thickness value t (not illustrating) corresponding to the average electrical pressure differential deltap Va between the second contact 112a and the 3rd contact 113a.This local wall thickness value t may be defined to the wall thickness of any position point P1 of the line L1 of the second contact 112a and the 3rd contact 113a, and the location point P1 of the present embodiment illustrates for the mid point of line L1.
Fig. 7 illustrates the schematic diagram of the pipe thickness measuring method according to another embodiment of the present invention.In the present embodiment, switch unit 150 switch current I inputs from the first contact 111a of measuring unit group 110, and switch current I exports from the 3rd contact 113a; Under this design, voltage measurement unit 130 can measure the first voltage difference delta V1 between the second contact 112a and the 4th contact 114a and the second voltage difference delta V2, and can calculate the average electrical pressure differential deltap Va between the second contact 112a and the 4th contact 114a according to this.Wall thickness analytic unit 140 can go calculating according to the curve D 1 of Fig. 4 or inquire about the local wall thickness value t (not illustrating) corresponding to the average electrical pressure differential deltap Va between the second contact 112a and the 4th contact 114a.Local wall thickness value t may be defined to the wall thickness of any position point P1 of the line L1 of the second contact 112a and the 4th contact 114a, and the location point P1 of the present embodiment illustrates for the mid point of line L1.
Fig. 8 illustrates the schematic diagram of the pipe thickness measuring method according to another embodiment of the present invention.In the present embodiment, the two point of two adjacent measuring unit groups 110 is concurrents.Such as, 3rd contact 113a of measuring unit group 110 ' and measuring unit group 110 ' ' the first contact 111a concurrent become a concurrent contact, and the 4th contact 114a of measuring unit group 110 ' and measuring unit group 110 ' ' the second contact 112a concurrent become another concurrent contact.When the wall thickness of a location point on the line that local wall thickness value t is defined as two concurrent contacts, then the average electrical pressure reduction between two concurrent contacts can only be measured once.For example, the first contact 111a and the local wall thickness value t that the average electrical pressure differential deltap Va between the second contact 112a calculates according to the 3rd contact 113a and the local wall thickness value t that the average electrical pressure differential deltap Va between the 4th contact 114a calculates and foundation measuring unit group 110 ' ' of measuring unit group 110 ' are the wall thickness of corresponding same position point P1, as long as therefore for the 3rd contact 113a of measuring unit group 110 ' and the 4th contact 114a or measuring unit group 110 ' ' the first contact 111a and the second contact 112a measure an average electrical pressure differential deltap Va.So, the number of times of input current and measuring voltage difference can be reduced, thus capable of reducing power consumption and lifting wall thickness analysis speed.
In another embodiment, when local wall thickness value t is defined as the wall thickness of the optional position point in region that two concurrent contacts and geometric center C1 surround, then the average electrical pressure reduction between two concurrent contacts needs to measure secondary.For example, shown in Fig. 8, the local wall thickness value t that average electrical pressure differential deltap Va between 3rd contact 113a of foundation measuring unit group 110 ' and the 4th contact 114a calculates is defined as the wall thickness of location point P1 ', and according to measuring unit group 110 ' ' the first contact 111a and the second contact 112a between the local wall thickness value that calculates of average electrical pressure differential deltap Va be defined as the wall thickness of location point P1 ' ', due to location point P1 ' and location point P1 ' ' non-co-located point, therefore the 3rd contact 113a of measuring unit group 110 ' and measuring unit group 110 ' ' between average electrical pressure differential deltap Va, and measuring unit group 110 ' ' the first contact 111a and the second contact 112a between average electrical pressure differential deltap Va ' need to measure individually.
Fig. 9 illustrates the pipe thickness measuring method process flow diagram according to another embodiment of the present invention.
In step S110, as shown in Figure 10 A, it illustrates the schematic diagram of the pipe thickness measurement module according to another embodiment of the present invention.Pipe thickness measurement module 200 is layed in the outside wall surface of easy thinning place of contact tube 10, as in the outside wall surface of bending part, to measure the local wall thickness of contact tube 10, and then the wall thickness change of monitoring contact tube 10.Pipe thickness measurement module 200 comprises several measuring unit group 110, power supply unit 120, voltage measurement unit 130, wall thickness analytic unit 140, switch unit 150 and control device 160.
In the present embodiment, each measuring unit group 110 comprises the first wire 111, second wire 112, privates 113 and privates 114, and wherein the first wire 111, second wire 112, privates 113 and privates 114 have the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a respectively.With above-described embodiment unlike, first contact 111a, the second contact 112a of the present embodiment, wantonly 2 concurrents of the 3rd contact 113a and the 4th contact 114a, and other 2 concurrents of the first contact 111a, the second contact 112a, the 3rd contact 113a and the 4th contact 114a.The present embodiment forms one first concurrent contact with the first contact 111a and the 3rd contact 113a, and the second contact 112a and the 4th contact 114a forms one second concurrent contact is example explanation.
In the present embodiment, the first wire 111 forms a thermocouple (Thermocouple), to measure the temperature of the first concurrent contact (the first contact 111a and the 3rd contact 113a) with privates 113.First wire 111 is different from the thermal expansivity of privates 113, makes the first wire 111 different from the output voltage difference of privates 113.Contact tube 10 can be obtained in the temperature of the first concurrent contact part by this output voltage difference.
First wire 111 can realize by material selection with the thermal expansion coefficient difference of privates 113.Enter a ground to say, the first wire 111 can be used as positive pole with in privates 113, and another can be used as negative pole; In one embodiment, the material of positive pole is iron, and the material of negative pole is made up of copper and nickel, and wherein the ratio of nickel accounts for 45%; Or the material of positive pole is made up of nickel and chromium, and wherein the ratio of chromium accounts for 10%, and the material of negative pole is made up of nickel, aluminium, manganese and silicon, and wherein the ratio of aluminium accounts for 2%, and the ratio of manganese accounts for 2%, and the ratio of silicon accounts for 1%; Or the material of positive pole is made up of nickel, chromium and silicon, and wherein the ratio of chromium accounts for 14%, and the ratio of silicon accounts for 1.5%, and the material of negative pole is made up of nickel, manganese and silicon, and wherein the ratio of silicon accounts for 4.5%, and the ratio of manganese accounts for 0.1%; Or the material of positive pole is copper, and the material of negative pole is made up of copper and nickel, and wherein the ratio of nickel accounts for 45%; Or the material of positive pole is made up of nickel and chromium, and wherein the ratio of chromium accounts for 10%, and the material of negative pole is made up of copper and nickel, and wherein the ratio of nickel accounts for 45%; Or the material of positive pole is made up of platinum and rhodium, and wherein the ratio of rhodium accounts for 13%, and the material of negative pole is platinum; Or the material of positive pole is made up of platinum and rhodium, and wherein the ratio of rhodium accounts for 10%, and the material of negative pole is platinum; Or the material of positive pole is made up of platinum and rhodium, and wherein the ratio of rhodium accounts for 30%, and the material of negative pole is made up of platinum and rhodium, and wherein the ratio of rhodium accounts for 6%; Or the material of positive pole is made up of tungsten and rhenium, and wherein the ratio of rhenium accounts for 5%, and the material of negative pole is made up of tungsten and rhenium, and wherein the ratio of rhodium accounts for 26%.But the material adapted of positive pole and negative pole is not limited thereto, as long as thermometric material can be realized, all can be used as the positive pole of the embodiment of the present invention and the material selection of negative pole.
In addition, the second wire 112 forms another thermocouple, to measure the temperature of the second concurrent contact (the second contact 112a and the 4th contact 114a) with privates 114.Second wire 112 similar in appearance to the first wire 111 and privates 113, can hold this and repeats no more with the material adapted of privates 114.
In step S120, as shown in Figure 10 A, power supply unit 120 supplies electric current I to i-th measuring unit group 110 by switch unit 150.From the first concurrent contact and the second concurrent contact of i-th measuring unit group 110 one of switch unit 150 switch current I inputs, and another from the first concurrent contact and the second concurrent contact of i-th measuring unit group 110 of switch current I exports.Illustrate for measuring unit group 110 ', switch unit 150 switch current I inputs from the first concurrent contact (the first contact 111a and the 3rd contact 113a) of measuring unit group 110 ', and switch current I exports from the second concurrent contact (the second contact 112a and the 4th contact 114a) of measuring unit group 110 '.
In step S130, as shown in Figure 10 A, voltage measurement unit 130 measures the first voltage difference delta V1 between the first concurrent contact of measuring unit group 110 ' and the second concurrent contact by switch unit 150.
In step S140, as shown in Figure 10 B, it illustrates the schematic diagram of the second concurrent contact input inverse current from Figure 10 A.Power supply unit 120 supplies electric current I to i-th measuring unit group 110 by switch unit 150.Switch unit 150 switch current I from the first concurrent contact and the second concurrent contact of i-th measuring unit group 110 this another input, and from the first concurrent contact and the second concurrent contact of i-th measuring unit group 110 this of switch current I exports.Illustrate for measuring unit group 110 ', switch unit 150 switch current I inputs from the second concurrent contact (the second contact 112a and the 4th contact 114a) of measuring unit group 110 ', and switch current I exports from the first concurrent contact (the first contact 111a and the 3rd contact 113a) of measuring unit group 110 '.
In step S150, as shown in Figure 10 B, voltage measurement unit 130 measures the second voltage difference delta V2 between the first concurrent contact of measuring unit group 110 ' and the second concurrent contact by switch unit 150.
The step S160 of the step S160 similar diagram 1 of Fig. 9, holds this and repeats no more.
In step S165, when contact tube 10 internal transmission high temperature, high pressure or acrid fluid, the average electrical pressure differential deltap Va measured by voltage measurement unit 130 is caused to contain temperature variations.But, by the step S165 of the present embodiment, can eliminate or reduce the average electrical pressure reduction variation that this temperature variations causes.
As shown in the formula (4), the thermalexpansioncoefficientα of voltage measurement unit 130 according to contact tube 10 and the temperature adjustmemt average electrical pressure differential deltap Va of contact tube 10, to obtain revised average electrical pressure differential deltap Va '.In formula (4), Δ Va (T) represents the average electrical pressure reduction that contact tube 10 is measured when temperature T (being such as the temperature of outside wall surface), T 0represent reference temperature, Δ Va ' represents revised average electrical pressure reduction (getting rid of the voltage difference after temperature variations), and α represents the thermal expansivity of contact tube 10.Thermalexpansioncoefficientα can be different with material category, and such as, with the material of contact tube 10 for carbon steel, it is at reference temperature T 0thermalexpansioncoefficientα be 0.005 DEG C -1.
ΔV a ′ = ΔVa ( T ) [ 1 + α ( T - T 0 ) ] . . . ( 4 )
In step S170, wall thickness analytic unit 140 is using revised average electrical pressure differential deltap Va ' as the average electrical pressure differential deltap Va of Fig. 4, and the local wall thickness value t that the curve D 1 of foundation Fig. 4 is gone calculating or inquired about corresponding to revised average electrical pressure differential deltap Va '.
The step S180 to S194 of similar above-mentioned Fig. 1 of step S180 to S194 of Fig. 9, holds this and repeats no more.
In sum, although the present invention is with preferred embodiment openly as above, so itself and be not used to limit the present invention.Those skilled in the art of the invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on appended claims confining spectrum.

Claims (20)

1. a pipe thickness measurement module, in order to measure the local wall thickness of a contact tube, this pipe thickness measurement module comprises:
One measuring unit group, comprises one first contact, one second contact, one the 3rd contact and one the 4th contact;
One power supply unit, in order to supply an electric current to this measuring unit group, wherein this electric current inputs from this first contact, this second contact, the 3rd contact and the 4th contact, and exports from another this first contact, this second contact, the 3rd contact and the 4th contact;
One voltage measurement unit, in order to measure other one first voltage difference therebetween in this first contact, this second contact, the 3rd contact and the 4th contact; And
One wall thickness analytic unit, calculates a local wall thickness value of this contact tube according to this first voltage difference.
2. pipe thickness measurement module as claimed in claim 1, also comprises:
One switch unit, input from this this first contact, this second contact, the 3rd contact and the 4th contact in order to switch this electric current, and switch this electric current from this first contact, this second contact, the 3rd contact and the 4th contact this another export.
3. pipe thickness measurement module as claimed in claim 1, also comprises:
One switch unit, in order to switch this electric current from this first contact, this second contact, the 3rd contact and the 4th contact this another input, and switch this electric current and export from this this first contact, this second contact, the 3rd contact and the 4th contact;
Wherein, this voltage measurement unit also in order to measure this other one second voltage difference therebetween in this first contact, this second contact, the 3rd contact and the 4th contact, and in order to calculate an average electrical pressure reduction of this first voltage difference and this second voltage difference.
4. pipe thickness measurement module as claimed in claim 3, wherein this wall thickness analytic unit is also according to the thermal expansivity of this contact tube and this average electrical pressure reduction of temperature adjustmemt of this contact tube, and also calculates this local wall thickness value of this contact tube according to this average electrical pressure reduction revised.
5. pipe thickness measurement module as claimed in claim 1, wherein this first contact, this second contact, the 3rd contact are separated with the 4th contact the outside wall surface being located at this contact tube.
6. pipe thickness measurement module as claimed in claim 1, also comprises:
One first wire, has this first contact;
One second wire, has this second contact;
One privates, has the 3rd contact; And
One privates, have the 4th contact;
Wherein, this in this first contact, this second contact, the 3rd contact and the 4th contact with in this first contact, this second contact, the 3rd contact and the 4th contact this other both in one be concurrent, and in this first contact, this second contact, the 3rd contact and the 4th contact this another and this first contact, this second contact, the 3rd contact and the 4th contact in this other both another be concurrent.
7. pipe thickness measurement module as claimed in claim 1, wherein this first contact, this second contact, the 3rd contact and the 4th contact are arranged in an array shape.
8. pipe thickness measurement module as claimed in claim 1, wherein this wall thickness analytic unit define this first contact, this second contact, the 3rd contact and the 4th contact this other both the pipe thickness of a location point of line be this local wall thickness value.
9. pipe thickness measurement module as claimed in claim 1, wherein this first contact, this second contact, the 3rd contact and the 4th contact form a geometric configuration, this wall thickness analytic unit define in this first contact, this second contact, the 3rd contact and the 4th contact this other both with the geometric center of this geometric configuration surround a location point in region pipe thickness be this local wall thickness value.
10. pipe thickness measurement module as claimed in claim 1, comprising:
This measuring unit group multiple, two in this first contact of one wherein in these measuring unit groups, this second contact, the 3rd contact and the 4th contact is concurrent with two in this first contact of this adjacent measuring unit group, this second contact, the 3rd contact and the 4th contact.
11. 1 kinds of pipe thickness measuring methods, comprising:
There is provided a pipe thickness measurement module in this contact tube, wherein this pipe thickness measurement module comprises a measuring unit group, and this measuring unit group comprises one first contact, one second contact, one the 3rd contact and one the 4th contact;
Supply an electric current to this measuring unit group, wherein this electric current inputs from this first contact, this second contact, the 3rd contact and the 4th contact, and exports from another of this first contact, this second contact, the 3rd contact and the 4th contact;
Other one first voltage difference therebetween measuring this first contact, this second contact, the 3rd contact and the 4th contact; And
A local wall thickness value of this contact tube is calculated according to this first voltage difference.
12. pipe thickness measuring methods as claimed in claim 11, also comprise:
Switch this electric current to input from this this first contact, this second contact, the 3rd contact and the 4th contact; And
Switch this electric current from this first contact, this second contact, the 3rd contact and the 4th contact this another export.
13. pipe thickness measuring methods as claimed in claim 11, also comprise:
Switch in this first contact, this second contact, the 3rd contact and the 4th contact this another input;
This of switching in this first contact, this second contact, the 3rd contact and the 4th contact exports;
Measure this other one second voltage difference therebetween in this first contact, this second contact, the 3rd contact and the 4th contact;
Calculate an average electrical pressure reduction of this first voltage difference and this second voltage difference; And
This local wall thickness value of this contact tube is calculated according to this average electrical pressure reduction.
14. pipe thickness measuring methods as claimed in claim 13, also comprise:
According to the thermal expansivity of this contact tube and this average electrical pressure reduction of temperature adjustmemt of this contact tube; And
This local wall thickness value of this contact tube is calculated according to this average electrical pressure reduction revised.
15. pipe thickness measuring methods as claimed in claim 11, wherein this first contact, this second contact, the 3rd contact are separated with the 4th contact the outside wall surface being located at this contact tube.
16. pipe thickness measuring methods as claimed in claim 11, wherein this pipe thickness measurement module also comprises:
One first wire, has this first contact;
One second wire, has this second contact;
One privates, has the 3rd contact; And
One privates, have the 4th contact;
Wherein, this in this first contact, this second contact, the 3rd contact and the 4th contact with this first contact, this second contact, the 3rd contact and the 4th contact this other both in one be concurrent, and in this first contact, this second contact, the 3rd contact and the 4th contact this another and this first contact, this second contact, the 3rd contact and the 4th contact in this other both in another be concurrent.
17. pipe thickness measuring methods as claimed in claim 11, wherein this first contact, this second contact, the 3rd contact and the 4th contact are arranged in an array shape.
18. pipe thickness measuring methods as claimed in claim 11, wherein this wall thickness analytic unit define this first contact, this second contact, the 3rd contact and the 4th contact this other both the pipe thickness of a location point of line be this local wall thickness value.
19. pipe thickness measuring methods as claimed in claim 11, wherein this first contact, this second contact, the 3rd contact and the 4th contact form a geometric configuration, this wall thickness analytic unit define this first contact, this second contact, the 3rd contact and the 4th contact this other both with the geometric center of this geometric configuration surround a location point in region pipe thickness be this local wall thickness value.
20. pipe thickness measuring methods as claimed in claim 11, also comprise:
There is provided this pipe thickness measurement module multiple in this contact tube, two in this first contact of a measuring unit group wherein in these measuring unit groups, this second contact, the 3rd contact and the 4th contact is concurrent with two in this first contact of this adjacent measuring unit group, this second contact, the 3rd contact and the 4th contact.
CN201410128848.2A 2014-03-12 2014-04-01 Pipe thickness measurement module and apply its pipe thickness measuring method Active CN104913715B (en)

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