CN107846740B

CN107846740B - Heating device for thermal state sealing test of fuel oil main pipe

Info

Publication number: CN107846740B
Application number: CN201711102148.6A
Authority: CN
Inventors: 戴奉林; 李艳玲; 方世杰
Original assignee: Guizhou Liyang Equipment Technology Development Co ltd; AECC Guizhou Liyang Aviation Power Co Ltd
Current assignee: Guizhou Liyang Equipment Technology Development Co ltd; AECC Guizhou Liyang Aviation Power Co Ltd
Priority date: 2017-11-10
Filing date: 2017-11-10
Publication date: 2021-02-23
Anticipated expiration: 2037-11-10
Also published as: CN107846740A

Abstract

The invention discloses a heating device for a fuel manifold thermal state sealing test, which comprises an induction coil for heating a fuel manifold nozzle and a device which is arranged below the induction coil and can change the magnetic flux of the coil; the induction coil comprises a plurality of coil units which are connected in series along the circumferential direction of the fuel oil main pipe, and each coil unit is a circular plane single-turn coil formed by bending a hollow copper pipe; the device capable of changing the magnetic flux of the coil is a copper piece capable of lifting along the direction vertical to the plane of the coil. The nozzle heating device can quickly heat the nozzle to a specified temperature, and simultaneously ensures the uniformity and consistency of the heating temperature of each nozzle, meets the test requirements, can smoothly test the thermal state sealing performance of the nozzle welding part of the fuel manifold, and has controllable and safe test process.

Description

Heating device for thermal state sealing test of fuel oil main pipe

Technical Field

The invention relates to a welding seam tightness test of a fuel oil main pipe, in particular to a heating device for the tightness test.

Background

As shown in fig. 1, a novel fuel oil main pipe is of an integral welding type structure and is formed by assembling and welding 235 parts in total, such as an annular main pipe and a nozzle assembly (a nozzle swirler, a nozzle with an air hood, a swirler and an auxiliary oil filter), wherein the number of welding positions is more (about 220 argon arc welding seams and 148 brazing welding seams), and 24 nozzles (1# to 24#) formed by welding are double-oil-way double-nozzle parallel centrifugal nozzles; the fuel oil main pipe is used as a power source of the engine, and the performance reliability of the fuel oil main pipe is very important; the nozzles of the fuel manifold of the engine adopt welded structures (see fig. 1 and 2), and when the fuel manifold works normally, the nozzles experience high temperature, and the sealing reliability of the welded parts must be ensured.

According to design requirements, a thermal state sealing performance test is carried out on a fuel main pipe, namely: the main oil circuit and the auxiliary oil circuit are supplied with fuel oil with certain pressure, the outside of the nozzle is heated to more than 400 ℃, and when the internal temperature is more than 50 ℃, the tightness of the welding seam is checked, and the leakage is not allowed. Because there is no testing device in this respect at present in China, therefore, it is urgently needed to establish a set of testing device, both satisfied the experimental requirement, stopped the emergence of potential safety hazard simultaneously, as the heating device in the testing device, its selection of type and arrangement form are very crucial.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the heating device for the fuel main pipe thermal state sealing test is provided, the completion of a certain novel fuel main pipe thermal state sealing test is ensured, and particularly the heating device capable of ensuring the heating temperature consistency and uniformity of 24 nozzles is provided.

The technical scheme of the invention is as follows:

the heating device for the fuel manifold thermal state sealing test comprises an induction coil for heating a fuel manifold nozzle and a device which is arranged below the induction coil and can change the magnetic flux of the coil;

the induction coil comprises a plurality of coil units which are connected in series along the circumferential direction of the fuel oil main pipe, and each coil unit is a circular plane single-turn coil formed by bending a hollow copper pipe;

the device capable of changing the magnetic flux of the coil is a copper piece capable of lifting along the direction vertical to the plane of the coil.

The cross section of the induction coil is a rectangular cross section.

The induction coils are two coils symmetrically arranged in the same plane.

The copper part is an annular copper sleeve in threaded connection with the outer surface of the oil collecting pipeline, and knurling is conducted on the outer surface of the annular copper sleeve.

The diameter of the inner ring of the annular copper sleeve is smaller than that of the inner ring of the coil unit, and the diameter of the outer ring of the annular copper sleeve is larger than that of the outer ring of the coil unit.

The annular copper bush is coaxial with the coil unit.

The invention combines the structural characteristics of the fuel main pipe, namely the main pipe is in a ring shape, 24 nozzles are uniformly distributed on the main pipe, so that the selected induction coil is a multi-station coil, each induction coil unit corresponds to one nozzle, a device capable of adjusting the magnetic flux of the coil is arranged below each nozzle and used as equipment for heating the nozzles to a specified temperature, and the phenomenon that the temperature difference is overlarge when 12 nozzles are simultaneously heated due to the difference of factors such as fuel pressure, flow, position and the like among the nozzles is avoided, and the test observation of 12 nozzles can not be simultaneously carried out at one time is avoided (if the design that one nozzle corresponds to one set of independent induction coil is adopted, the test equipment is very complicated, the occupied space is large, and the complexity of the equipment can be reduced by the mode.

The invention fills the blank of equipment for checking the sealing performance of a novel welded fuel oil main pipe in a hot state.

Drawings

FIG. 1 is a schematic view of a fuel manifold configuration;

FIG. 2 is a schematic view of nozzle welding;

FIG. 3 is a schematic diagram of the structure of the test device;

FIG. 4 is a schematic view of an induction coil flux adjusting apparatus;

fig. 5 is a schematic view of the structure of the induction coil.

Detailed Description

The fuel manifold thermal state sealing test device of the invention is explained in detail with the accompanying drawings.

The device for testing the thermal-state sealing performance of the fuel main pipe comprises a closed cavity for placing the fuel main pipe, wherein a test board for installing the fuel main pipe is arranged in the cavity. An induction coil used for heating the welding position of the nozzle of the fuel main pipe is arranged in the closed cavity, and the induction coil and an induction coil power supply are cooled by water; the closed cavity is connected with the two nitrogen pipelines, and an oxygen concentration sensor is arranged in the closed cavity; the fuel oil main pipe is communicated with the fuel oil supply and recovery pipeline and is used for supplying fuel oil and recovering the fuel oil.

As shown in fig. 3, the main structure of the test board includes a first heat-insulating board 1, a fuel manifold 6 to be tested is placed above the first heat-insulating board 1, a nozzle portion is located below the first heat-insulating board 1, each nozzle corresponds to one coil unit of the induction coil 2, a heating fine-tuning device 5 is correspondingly arranged right below each coil unit (namely, the axis of the coil unit is collinear with the central axis of the fine-tuning device 5), a second heat-insulating board 3 is arranged below the heating fine-tuning device 5, a support plate 4 is arranged below the second heat-insulating board 3, and the support plate 4 is used for fixing an oil receiver 7, namely, a pipeline for recovering fuel from the.

As shown in fig. 5, the structure of the induction coil includes two semicircular coils, each coil is about 1/2 circumference length, each coil is connected with 12 coil units in series, and the 12 coil units are water-cooled by copper pipes (copper pipes on the outer circumference in fig. 5) which are also distributed along the circumference. Each coil unit is formed by bending a hollow copper pipe with a rectangular cross section, is circular in shape and is a planar single-turn coil (namely, the upper surface and the lower surface of the coil unit are parallel).

As shown in fig. 4, the fine tuning device for fine tuning the magnetic flux of the induction coil is substantially an annular copper sleeve capable of lifting along the oil collecting pipeline, the annular copper sleeve moves on the oil collecting pipeline through the thread of the inner wall of the annular copper sleeve and the thread of the outer surface of the oil collecting pipeline in a matching manner, the annular copper sleeve is coaxial with the coil unit, and finally the magnetic flux of the coil unit above the annular copper sleeve influences the heating temperature of the fine tuning nozzle. The diameter of the inner ring of the annular copper sleeve is smaller than that of the inner ring of the coil unit (namely the projection of the inner ring of the annular copper sleeve on the horizontal plane is positioned in the projection of the inner ring of the coil unit), and the diameter of the outer ring of the annular copper sleeve is larger than that of the outer ring of the coil unit.

The nitrogen pipeline divide into two, and wherein first nitrogen pipeline lets in nitrogen gas before being used for the experiment, and in order to get rid of the air in the seal chamber, the second nitrogen pipeline is used for preventing to lead to under the oily state, and the oil mist spreads to seal chamber, leads to oil mist concentration height, appears the security problem.

The fuel manifold hot state sealing test needs to heat the outside and the inside of the nozzle to different temperatures, the state 1 is that the outside temperature of the nozzle is T1, the inside temperature is T2, T1 is more than T2, the state 2 is that the outside temperature of the nozzle is T3, the inside temperature is T4, T3 is more than T4, wherein T1 is not equal to T3, T2 is not equal to T4, T1 and T3 are more than 400 ℃, T2 and T4 are more than 50 ℃.

The specific implementation process is as follows:

1) preparation and calibration before test

Step 1, inspecting the mechanical, instrument and electrical parts of the test device, and inspecting the instrument and instrument

Within a fixed period;

step 2, after the standard fuel oil main pipe is arranged on a main pipe test board in the closed cavity, starting induction coil cooling and induction coil power supply cooling, and observing the pressure of cooling water;

step 3, starting a high-frequency power supply of the induction coil, and observing a voltage value;

step 4, starting a first nitrogen pipeline, observing the nitrogen flow and simultaneously observing the oxygen concentration value;

step 5, after the oxygen concentration value is lower than 6%, starting a second nitrogen pipeline, wherein the nitrogen flow is the same as that of the first nitrogen pipeline (the first nitrogen pipeline is closed) when the first nitrogen pipeline is communicated;

and 6, starting a fuel pump group to supply oil to the header pipe, regulating the pressure to the pressure value in the state 1, starting a high-frequency power supply to heat, slowly regulating a heat potentiometer until the displayed temperature reaches the temperature required in the state 1, and maintaining for 1 min.

Step 7, slowly adjusting a heat potentiometer, and stopping heating;

step 8, when the surface temperature of the nozzle is lower than the designated temperature, recording the cooling time, closing the oil supply pump, stopping supplying oil, closing the first and second paths of nitrogen, and closing the water cooling loop;

step 9, repeating the process, and testing the standard header pipe according to the requirement of the state 2;

step 10, respectively recording the heating heat value and the cooling process time in the two states;

note: and in the step 6, if the heating temperature of each nozzle does not meet the requirement, the heating is carried out according to the steps 7 and 8, after the heating is stopped, the magnetic flux is changed by adjusting a fine adjustment device corresponding to the position of the nozzle on the equipment to change the heating temperature, and then the steps 1 to 10 are repeated.

2) Product test:

1. test on fuel manifold test condition 1:

firstly, after a testing main pipe is arranged on a main pipe testing table in a closed cavity, coil cooling and power supply cooling are started, and the pressure of cooling water is observed to meet the requirement of the process step 2;

secondly, starting a high-frequency power supply, and observing the voltage value to meet the requirement of the step 3;

starting the first nitrogen pipeline, observing that the flow meets the requirements of the step 4, and simultaneously observing the oxygen concentration value;

fourthly, when the oxygen concentration value is lower than 6 percent, a second nitrogen pipeline is started, and the flow value meets the requirement of the step 5; starting a fuel pump set, adjusting the pressure of the fuel to the pressure value of the state 1, starting a high-frequency power supply for heating, and starting and adjusting the rotating speed of an observation mirror so as to facilitate observation;

sixthly, selecting and heating the nozzle No. 1-12, slowly adjusting a heat potentiometer to enable the heating voltage and the heating current to meet the requirement value of the standard component in the state 1, keeping for 1min after the state is stabilized for 10 s-20 s, and recording the starting time t1 and the ending time t 2.

Seventhly, slowly adjusting a heat potentiometer and stopping heating;

and when the surface temperature of the nozzle is lower than 35 ℃, closing the oil supply pump, stopping supplying oil, closing the first and second nitrogen pipelines and closing the water cooling loop.

Ninthly, adjusting the shooting playback time, and observing whether the welding seam position of the heating main pipe leaks oil in a time period from t1 to t 2; (spray-like oil mist can occur if oil leaks).

And (4) heating the 13# to 24# nozzles on the manifold, repeating the steps, and observing whether oil leaks.

2. Test on manifold test condition 2:

fourthly, when the oxygen concentration value is lower than 6 percent, a second nitrogen pipeline is started, and the flow value meets the requirement of the step 5;

starting a fuel pump set, adjusting the pressure of the fuel to the pressure value of the state 2, starting a high-frequency power supply for heating, and starting and adjusting the rotating speed of an observation mirror so as to facilitate observation;

sixthly, selecting and heating the nozzle No. 1-12, slowly adjusting a heat potentiometer to enable the heating voltage and the heating current to meet the requirement value of the standard component in the state 2, keeping for 1min after the state is stabilized for 10-20 s, and recording the starting time t3 and the ending time t 4.

Seventhly, slowly adjusting a heat potentiometer and stopping heating;

Ninthly, adjusting the shooting playback time, and observing whether the welding seam position of the heating main pipe leaks oil in a time period from t3 to t 4; (spray-like oil mist can occur if oil leaks).

Note that: 1. in the whole heating process, the oxygen concentration is required to be ensured to be lower than 6%, if the oxygen concentration exceeds the oxygen concentration, an emergency stop button is immediately pressed down, and the equipment is stopped;

2. and ensuring that the flow value of nitrogen in the heating process is not lower than the flow value determined by the standard fuel oil main pipe, and immediately pressing an emergency stop button to stop the equipment if the flow value of nitrogen in the heating process is higher than the flow value determined by the standard fuel oil main pipe.

Claims

1. A heating device for fuel manifold hot state seal test, its characterized in that: the device comprises an induction coil for heating a fuel manifold nozzle and a device which is arranged below the induction coil and can change the magnetic flux of the coil;

the device capable of changing the magnetic flux of the coil is a copper piece capable of lifting along the direction vertical to the plane of the coil;

the copper part is an annular copper sleeve in threaded connection with the outer surface of the oil collecting pipeline, and the outer surface of the annular copper sleeve is subjected to knurling treatment;

the annular copper bush is coaxial with the coil unit.

2. The heating device for the fuel manifold thermal state sealing test according to claim 1, characterized in that: the cross section of the induction coil is a rectangular cross section.

3. The heating device for the fuel manifold thermal state sealing test according to claim 1, characterized in that: the induction coils are two coils symmetrically arranged in the same plane.

4. The heating device for the fuel manifold thermal state sealing test according to claim 1, characterized in that: the diameter of the inner ring of the annular copper sleeve is smaller than that of the inner ring of the coil unit, and the diameter of the outer ring of the annular copper sleeve is larger than that of the outer ring of the coil unit.