CN207894533U - The platinum resistance temperature sensor of triplex redundance measuring temperature is provided for engine mouth - Google Patents

Abstract

A kind of a kind of platinum resistance temperature sensor that triplex redundance measuring temperature is provided for engine mouth disclosed by the utility model, it is desirable to provide triplex redundance backup total temperature probe that can be promoted sensor reliability and reduce volume and weight.The utility model is achieved by following technical proposals：The inner tube of the double-layer seal semiconductor inserting tube of coaxial connected temperature sensing sensor passes through, and the metal venturi across temperature sensing sensor connects firmly on the tail-hood of rear end；Three groups of platinum filaments being wrapped on electric conductor reel draw three platinum wire taps, platinum filament coil winding is at least formed by three groups of equivalent insulation platinum wire resistance coilings, the six roots of sensation tap line of platinum wire resistance carries out coiling at equal intervals within the scope of coiling, wire turn is arranged in order continuous coiling by layer in an axial direction, and three groups of taps are separately connected bent head lug plate and extraction wire；It is corresponding resistance signal by the temperature transition sensed, engine control system is supplied to be converted to the triplex redundance electric signal of three paths selection.

Description

The platinum resistance temperature sensor of triplex redundance measuring temperature is provided for engine mouth

Technical field

The utility model is related to one kind can be widely used for meteorology, automobile, aviation, industrial automation measurement and various experiment instruments The fields such as instruments and meters, the characteristic varied with temperature using component resistance parameter are detected temperature parameter related with temperature Device.The triplex redundance total temperature probe measured in particular for engine intake temperature.

Background technology

The sensor of engine control system due to working in high temperature, high pressure, the adverse circumstances of strong vibration, failure rate compared with Height, reliability have conclusive effect to the normal work of entire control system.At present in aeroengine control system Generally use dual-redundancy structure or double remainings add the structure in protection channel, have identical and mutually independent two channels, Two channels Hot Spare each other, when a certain channel is broken down, control system can be switched to another channels operation.By adopting The reliability of engine sensor system can be greatly improved with work remaining.Due to engine control system propose it is higher Reliability requirement, to need to improve the reliability of system using redundancy technology, redundancy technology is to improve system task reliability With a kind of technology of security reliability.It can use the less high component of reliability, form highly-reliable system by remaining, reach Reduce the purpose of system failure rank.Redundancy technology is divided into hardware remaining, more than software according to the unusual of its implementation Degree and time remaining.Hardware remaining refers to introducing multiple hardware in systems, although these hardware, which are not systems, realizes its control Necessary to function processed, still, they can make system continue to work normally in the case where failure occurs.Software remaining refer to by Some critical softwares replicate more parts and are stored in memory, realize multiple software.And time remaining refers to using to repeat certain section of program very Failure is detected to the method for entire program or is restored from failure.But the increase of system margin necessarily leads to system components The increase of number, the raising of weight increase the complexity of system, and the consequence brought is that the basic reliability of system declines.By Excessively system components number can be caused to increase in remaining number, weight improves, and increases the complexity of system instead, leads to system base This reliability reduces, when increased parallel element or system unit number are more than two or three, by increase remaining element Or system unit obtain reliability and the growth of Mean interval time will be gradually reduced.To ensure system reliability Increase and do not offseted by the increased failure rate of component that remaining layout is brought, the best remaining number of generally use is 3~5.

When engine works, import wind speed is higher, and wind speed will produce a large amount of heat in engine surface retardance so that pass Temperature around sensor increases, to make sensor temperature sensing part platinum resistance generate resistance variations, to test to engine into Gas total temperature engines are usually to follow compressor characteristic curve to be controlled.It is total in the curve under the conditions of sea-level standard Pressure and the ratio of total temperature can provide reference to engine performance.The sensor can be used for measuring compressor inlet temperature, be supplied to Engine control system, the engine compression ratio for control.The prior art is used to measure the thermometric of engine intake temperature Sensor is that one kind carrying resistance value room and temperature-sensitive thermocouple class temperature sensor mostly, and temperature-measurement principle is two kinds of different components Material conductor forms closed circuit, when both ends when temperature gradient, in circuit there are just having electric current to pass through, at this time between both ends just There are electromotive force --- and thermo-electromotive force, here it is so-called Seebeck effects.The homogeneous conductor of two kinds of different components is thermode, The higher one end of temperature is working end, and the lower one end of temperature is free end, and free end is generally in some stationary temperature Under..But since engine intake portion temperature is relatively low, generally at 300 degree hereinafter, using thermocouple assay there are sensitivity not Height, precision are relatively low and compensation difficulty is larger, and the process-cycle is longer, and product qualification rate is not high, and it is few so that the country only has at present Shuo Jijia enterprises have the ability production similar to sensor.Currently, the mating total temperature probe of state's intrinsic motivation is still single remaining or double Redundancy architecture.In order to improve the reliability of engine control system, need to increase total temperature probe remaining, in prior art situation Under, engine control system is only capable of solving the problems, such as this using total temperature probe quantity is increased, and causes installation inconvenient, weight and body Product is significantly promoted.Prior art temperature sensor is platinum resistance temperature sensor, and output only has the signal of single redundancy. This method, which exists, to be had a disadvantage that, is exactly there is uncertain and systematic parameter in systematic parameter to change over time meeting Variation is generated, measurement data will produce capital blunder error, it is higher to cause rate of false alarm.Usually used platinum resistance temperature passes Sensor zero degree resistance value be 100 Ω, resistance change rate be 0.3851 Ω/DEG C.It is 1mA that conventional test electric current, which is Pt100, Pt1000 is 0.5mA.In general, platinum resistance temperature sensor PT100 is based on ceramic (AL203) substrate, in platinum layer Upper laser carves circuit, and it is 100 degrees centigrade when 0 to make the resistance value of its circuit, and in plating up-protective layer, welding lead is then It burn-ons the structure of fixed bed.When temperature increases, resistance value will be increased according to certain temperature coefficient, then be led to Certain computational methods are crossed to test out the temperature in the circuit.Platinum resistance has one-to-one dependence with temperature, can be with It is approximately linear.According to the difference of temperature transducer gage system, platinum resistance is divided into three kinds of two-wire system, three-wire system and four-wire system, Three kinds of gage systems respectively have a feature, and two-wire system gage system has lead simple, but the problem is that measurement error is larger, Inevitable lead-in resistance error, is appropriate only for measurement accuracy occasion of less demanding in measurement.Two-wire system platinum resistance temperature The test method for spending sensor is fairly simple, to use two operational formulas, i.e. Vout=K × I × (RT+2r) and RT= Vout/ (K-I) -2r, this sensor is only applicable to the closer situation of distance between measuring system and sensor, if distance Farther out, the accuracy of measurement can be greatly affected.The accuracy that three limitation platinum sensors measure is higher than two-wire system, uses To operational formula Vo=R1/ (R1+R4) × VB-R2/ (R2+R3) VB=(R1/R4-R2/R3)/(1+R1/R4) (1+R2/R3) VB.Bridge balance condition is R1 × (Rx+r3)=R2 × (Rpt100+r1).Three-wire system gage system uses one end lead for two Root line, the mode that other end lead is one, the circuit for measuring platinum resistance is usually unbalanced bridge, and platinum resistance is as electric bridge One arm resistance, by the power end of one piece-root grafting of conducting wire to electric bridge, remaining two bridge arms being coupled with where platinum resistance and with On its adjacent bridge arm, using nonequilibrium bridge principle, various resistance type sensor RT are accessed into bridge circuit, it is non-with bridge Balanced voltage reflects the minor change of arm resistance, detects transformation temperature, pressure of external physical quantity etc., but must be complete Equal arm bridge.Industrial to be generally used three-wire system connection, 3 sectional area of wire and length that three line gage systems are drawn are homogeneous Together, usual three-wire system resistance is measured using unbalanced electric bridge, and the influence of lead resistance can be eliminated when measuring, and is surveyed Accuracy of measurement is higher than two-wire system.The cost of four-wire system platinum sensor is higher, need operational formula calculate Vout=K × I × R × (R-RT)/(3×R+RT+2r).It is power supply line to have both threads in four-wire system gage system, and in addition two are signal wire.Electricity Source and signal are to separate work, and this method can effectively remove line resistance.If the resistance value and conductor resistance of testing resistance Quite, can only just it use measurement method this method measurement accuracy of four-wire system higher when or even much smaller than conductor resistance, but the party Method needs sensor to generate 4 leads, can increase the weight of cost and entire test system during long distance transmission, no Certain special industry requirements can be met, be mainly used for high-precision temperature detection.

The utility model is the further development and improvement to prior art total temperature probe.

Invention content

The purpose of this utility model be in view of the shortcomings of the prior art place, provide one kind can promote sensor can By property, the volume and weight of sensing system are reduced, is mainly used for the triplex redundance total temperature probe of engine intake temperature measurement.

The purpose of this utility model can be reached by the following measures.It is a kind of to provide triplex redundance measurement temperature for engine mouth The platinum resistance temperature sensor of degree, including：By streamline support connect firmly be threadedly coupled disk disk body on temperature sensing sensor and Cable sleeve, it is characterised in that：The inner tube of the double-layer seal semiconductor inserting tube of coaxial connected temperature sensing sensor is worn by thermal insulation layer The metal venturi for crossing temperature sensing sensor connects firmly on the tail-hood of rear end, and is encapsulated in the mutually independent gas channel of metal outer pipe； Three groups of platinum filaments for being wrapped on electric conductor reel draw three platinum wire taps, and platinum filament coil winding is at least equivalent by three groups Insulation platinum wire resistance coiling forms, three groups of equivalent platinum wire resistance at least six roots of sensation tap, and the six roots of sensation of platinum wire resistance is taken out Head line carries out coiling at equal intervals within the scope of coiling, and wire turn is arranged in order continuous coiling, three groups of taps by layer in an axial direction It is separately connected bent head lug plate and extraction wire；It is corresponding resistance signal by the temperature transition sensed, is distinguished by conducting wire Mutual indepedent and equal performance triple backup resistance signals are exported, engine control system is supplied to be converted to the choosing of three paths The triplex redundance electric signal selected.

The utility model has the following effects that compared with the prior art.

The utility model is directed to engine system demand, and the sense on being threadedly coupled disk disk body is connected firmly using streamline support Temperature sensor and the corresponding structure design of cable sleeve, make it not increase volume, weight, will under the premise of not reducing performance By thermal insulation layer, the metal venturi across temperature sensing sensor connects firmly on the tail-hood of rear end the inner tube of double-layer seal semiconductor inserting tube, And it is encapsulated in the mutually independent gas channel of metal outer pipe, protects double-layer seal semiconductor inserting tube not by external interference and breaks It is bad.Total Air Temperature signal exports mutually independent three groups of platinum filaments from electric energy to magnetic energy again to electric energy by cable sleeve (4) cable Conversion, while voltage and current size is changed according to existing functional relation between resistance and temperature, performance it is same more than three Electric signal is spent, three groups of signals of output make sensor have the function of the triplex redundance of itself triple backup, reduce temperature-sensitive sensing All adverse consequences caused by device failure, greatly promote reliability.

The utility model is directed to engine system, is close to double-layer seal semiconductor inserting tube cylindrical surface using bent head lug plate, Coil windings tap is separately connected the conducting wire output signal of cable sleeve by bent head lug plate；Air-flow flows through probe and passes through bilayer The inner tube wall surface of sealing semiconductor inserting tube, forms boundary-layer on wall surface, converts airflow kinetic energy to thermal energy, thermal energy and atmospheric static Temperature is experienced by temperature sensing sensor together, is sent into temperature sensing sensor measurement end and is converted into resistance signal, converts total Air Temperature to electricity Signal is hindered, total Air Temperature signal is by cable sleeve cable, and output is mutual indepedent, and the backup triplex redundance telecommunications of equal performance Number, while not reducing system performance precision with reliability, reducing the course line used in engine intake control system can Unit LRU (Least Recently Used) quantity is replaced, the volume and weight of sensing system are reduced.

The spy of a streamline support and a forced draft air inlet is arranged in the utility model on sensor windward side Pipe connects firmly streamline support on being threadedly coupled disk disk body, is mounted in engine intake, the easy jail of the mounting means Gu being not easy to occur to loosen and fall off in macroseism environment.

Description of the drawings

Fig. 1 is the platinum resistance temperature sensor three-dimensional signal that the utility model provides triplex redundance measuring temperature for engine mouth Figure.

Fig. 2 is the partial sectional view of Fig. 1.

Fig. 3 is the structure chart of Fig. 1 streamline supports.

Fig. 4 is the structure chart that Fig. 1 draws position.

Fig. 5 is Fig. 2 electric conductor reel organigrams.

Fig. 6 is the principle schematic of temperature sensing sensor.

In figure：1 temperature sensing sensor, 2 streamline supports, 3 are threadedly coupled disk, and 4 cable sleeves, 5 pop one's head in, 6 metal outer pipes, and 7 Metal venturi, 8 bent lug plates, 9 double-layer seal semiconductor inserting tubes, 10 conducting wires, 11 insulating layers, 12 metallic shield sets, 13 platinum filaments, 14 electric conductor reels

The utility model is further illustrated with reference to the accompanying drawings and examples, but is not therefore limited in the utility model Among the embodiment described range.

Specific implementation mode

- Fig. 4 refering to fig. 1.In the embodiment described below, a kind of platinum that triplex redundance measuring temperature is provided for engine mouth Resistance temperature sensor, including：The temperature sensing sensor 1 and cable on being threadedly coupled 3 disk body of disk are connected firmly by streamline support 2 Sleeve 4.The inner tube of the double-layer seal semiconductor inserting tube 9 of coaxial connected temperature sensing sensor 1 passes through temperature sensing sensor by thermal insulation layer 1 metal venturi 7 connects firmly on the tail-hood of rear end, and is encapsulated in 6 mutually independent gas channel of metal outer pipe, bent head lug plate 8 elasticity are tightly attached to 9 cylindrical surface of double-layer seal semiconductor inserting tube, and connection signal toroidal transformer secondary coil tapping measures End, coil windings tap are separately connected 10 output signal of conducting wire of cable sleeve 4 by bent head lug plate 8；Air-flow flows through probe 5 By the inner tube wall surface of double-layer seal semiconductor inserting tube 9, boundary-layer is formed on wall surface, converts airflow kinetic energy to thermal energy, it should Thermal energy is experienced together with Static Air Temperature by temperature sensing sensor 1, and the independent platinum resistance of three in temperature sensing sensor 1 group is led based on metal There are certain functional relations between body or the resistance and temperature of semi-conducting material, i.e., lead due to temperature change metallic conductor and partly The temperature transition sensed is corresponding resistance signal, passes through 4 line of cable sleeve by the principle that the resistance of body changes therewith Cable, output is mutual indepedent, and the triplex redundance electric signal of equal performance is respectively supplied to test system.

Double-layer seal semiconductor inserting tube 9 is formed with 7 stepped cylindrical outer tube body of metal venturi and shaft end with probe 5 including tail portion Interior tube body, and the insulating layer heat insulator and platinum filament coil winding that are encapsulated between inside and outside tube body.It pops one's head in 5 stepped hole fluoran stream surfaces It is formed with the chamfering or conical bore for improving flow velocity.After ambient temperature changes, the resistance values of three groups of platinum filament platinum resistance is also therewith Phasic property changes, the three groups of resistance of independent platinum resistance based on metallic conductor or semi-conducting material and existing Rt=R0 between temperature This variation is guided out by × (1+ α ︱ t-t0 ︱) temperature and resistance functional relations by conducting wire 10, and supply test system is tested, Test out ambient temperature, wherein Rt is resistance value of the metallic conductor at t DEG C；R0 is resistance of the metallic conductor at 0 DEG C, and α is Metallic conductor temperature coefficient, 1/ DEG C.

Refering to Fig. 3.Streamline support 2 is located at temperature sensing sensor 1 and is threadedly coupled between disk 3, and streamline support 2 meets stream side To in spindle, the hollow spindle body that airflow direction edge keeps acute angle is met.The structure small, light-weight, structure with windage Secured advantage.It is computed, it is best that the length of streamline support 2, which is 35mm-45mm, is avoiding the same of friction layer disturbance When, increase product structure intensity, adapts to the mechanical environment of engine.

Refering to Fig. 4.The cylinder of 12 filling insulating layer 11 of metallic shield set may be used in cable sleeve 4, and insulating layer 11 wraps up Four-wire system conducting wire 10 can avoid external mechanical damage and electromagnetic interference, can eliminate influence of the cable resistance to measurement accuracy in this way. The total temperature signal transmission that cable sleeve 4 is sensed sensor is to engine control system.

Refering to Fig. 2, Fig. 5.Platinum filament coil winding is at least formed by three groups of equivalent insulation platinum wire resistance coilings, three groups etc. With platinum wire resistance at least six roots of sensation tap, the six roots of sensation tap line of platinum wire resistance within the scope of coiling at equal intervals into Row coiling, wire turn are arranged in order continuous coiling by layer in an axial direction, and three groups of taps are separately connected bent head lug plate 8 and extraction wire. Six roots of sensation equalization is close to be divided into three groups around platinum wire resistance extraction wire, and the shell across sealing is connected with cable sleeve 4.4 are One output.An air inlet forced draft is arranged on sensor windward side and enters for the present embodiment, makes not by metal venturi 7 With the air-flow under environment, constant airspeed is velocity of sound after entering gas channel, and the air-flow for becoming velocity of sound is felt using retardation Temperature sensor 1 senses, resistance of the three groups of independent platinum resistance in temperature sensing sensor 1 based on metallic conductor or semi-conducting material with Existing functional relation between temperature, i.e., due to the principle that the resistance of temperature change metallic conductor and semiconductor changes therewith, It three groups of independent total Air Temperatures will be sensed is converted to corresponding resistance signal and be respectively supplied to test system.

Refering to Fig. 6.Temperature sensing sensor 12 conducting wires in total, every 4 are an output.Temperature sensing sensor 1 is using electric from platinum It hinders both ends and draws 4 lines, independently separately the four-wire system of wiring connects circuit loop with voltage measurement circuit when wiring, with every 4 Divide variable resistance Rt1 for one group of parallel connection, one variable resistance Rt, variable resistance Rt, variable resistance Rt2, variable resistance Rt3, can be changed Tetra- groups of outputs of resistance Rt1, can effectively eliminate error caused by cable.The resistance and contact resistance of four-wire system connecting wire can be to platinum Resistance temperature measurement precision produces bigger effect, and this influence can be effectively eliminated using the four-wire system mode of connection.Measurement accuracy can be improved.

Above description is only a specific implementation of the present invention, but the scope of protection of the utility model is not limited to In this, any one skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with the power Subject to the protection domain that profit requires.

Claims (10)

1. a kind of platinum resistance temperature sensor that triplex redundance measuring temperature is provided for engine mouth, including：Pass through streamline support (2) temperature sensing sensor (1) and cable sleeve (4) on being threadedly coupled disk (3) disk body are connected firmly, it is characterised in that：It is coaxial to be connected The inner tube of the double-layer seal semiconductor inserting tube (9) of temperature sensing sensor (1) passes through the metal of temperature sensing sensor (1) by thermal insulation layer Venturi (7) connects firmly on the tail-hood of rear end, and is encapsulated in metal outer pipe (6) mutually independent gas channel；Three groups are wrapped in electricity Platinum filament (13) on conductor reel (14) draws three platinum wire taps, and platinum filament coil winding is at least by three groups of equivalent insulation Platinum wire resistance coiling forms, three groups of equivalent platinum wire resistance at least six roots of sensation tap, the six roots of sensation tap line of platinum wire resistance Carry out coiling at equal intervals within the scope of coiling, wire turn is arranged in order continuous coiling, three groups of tap difference by layer in an axial direction The bent head lug plate (8) of connection and extraction wire (10)；It is corresponding resistance signal by the temperature transition sensed, passes through conducting wire (10) mutual indepedent and equal performance triple backup resistance signals are exported respectively, and engine control system is supplied to be converted to three The triplex redundance electric signal of paths selection.

2. the platinum resistance temperature sensor as described in claim 1 for providing triplex redundance measuring temperature for engine mouth, feature It is：Double-layer seal semiconductor inserting tube (9) includes that tail portion is formed with metal venturi (7) stepped cylindrical outer tube body and shaft end with probe (5) interior tube body, and the insulating layer heat insulator and platinum filament coil winding that are encapsulated between inside and outside tube body.

3. the platinum resistance temperature sensor as described in claim 1 for providing triplex redundance measuring temperature for engine mouth, feature It is：Probe (5) stepped hole fluoran stream surface is formed with the chamfering or conical bore for improving flow velocity.

4. the platinum resistance temperature sensor as described in claim 1 for providing triplex redundance measuring temperature for engine mouth, feature It is：Streamline support (2) is located at temperature sensing sensor (1) and is threadedly coupled between disk (3), and streamline support (2) meets stream direction In spindle, the hollow spindle body that airflow direction edge keeps acute angle is met.

5. the platinum resistance temperature sensor as claimed in claim 4 for providing triplex redundance measuring temperature for engine mouth, feature It is：The length of streamline support (2) is 35mm-45mm.

6. the platinum resistance temperature sensor as described in claim 1 for providing triplex redundance measuring temperature for engine mouth, feature It is：Cable sleeve (4) fills the cylinder of insulating layer (11) using metallic shield set (12), and insulating layer (11) package four-wire system is led Line (10).

7. the platinum resistance temperature sensor as described in claim 1 for providing triplex redundance measuring temperature for engine mouth, feature It is：Six roots of sensation equalization is close to be divided into three groups around platinum wire resistance extraction wire, and the shell of sealing is passed through to be connected with cable sleeve (4) It connects.

8. the platinum resistance temperature sensor as described in claim 1 for providing triplex redundance measuring temperature for engine mouth, feature It is：An air inlet forced draft is arranged on sensor windward side to enter, makes under varying environment by metal venturi (7) Air-flow constant airspeed after entering gas channel is velocity of sound, becomes the air-flow of velocity of sound using retardation by temperature sensing sensor (1) it senses, resistance and temperature of three groups of independent platinum resistance based on metallic conductor or semi-conducting material in temperature sensing sensor (1) Between existing functional relation, the principle that the resistance based on temperature change metallic conductor and semiconductor changes therewith will sense Corresponding resistance signal, which is converted to, to three groups of independent total Air Temperatures is respectively supplied to test system.

9. the platinum resistance temperature sensor as described in claim 1 for providing triplex redundance measuring temperature for engine mouth, feature It is：Temperature sensing sensor (1) draws four lines using from platinum resistance both ends, and circuit loop and voltage measurement circuit are independent when wiring The four-wire system connection of wiring is separated, with every four for one group of parallel connection, one variable resistance Rt, variable resistance Rt divide variable resistance Tetra- groups of Rt1, variable resistance Rt2, variable resistance Rt3, variable resistance Rt1 outputs.

10. the platinum resistance temperature sensor as described in claim 1 for providing triplex redundance measuring temperature for engine mouth, feature It is：Air-flow is flowed into double-deck close by metal outer pipe (6) socket annular distance and electric conductor reel (14) through probe (5) measurement end The inner tube wall surface for sealing semiconductor inserting tube (9), becomes velocity of sound air-flow, in sealing semiconductor by metal venturi (7) Lavalle principle The air flow resistance boundary-layer for forming different rates inside and outside inserting tube (9) on wall surface, converts airflow kinetic energy to Seebeck effect thermal energy, The thermal energy is experienced together with Static Air Temperature by three groups of platinum filaments (13) and temperature sensing sensor (1) measurement end, and three groups of platinum filaments (13) are with heat Can temperature change and the platinum resistance that changes, generate changing magnetic field, in changing magnetic field induction generate the electric current of difference variation, Identical triple backup resistance signals are exported by conducting wire (10).