CN110844108A - Repairing tool and repairing method for fluoroplastic valve port of airplane pressure reducer component - Google Patents
Repairing tool and repairing method for fluoroplastic valve port of airplane pressure reducer component Download PDFInfo
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Abstract
The invention discloses a repairing tool and a repairing method for a fluoroplastic valve port of an aircraft pressure reducer component, and relates to the technical field of pressure reducer repairing. The repairing tool comprises a machine grinding oilstone rod main body, a first grinding oilstone circular table, a second grinding oilstone circular table and a grinding oilstone positioning bulge, wherein the first grinding oilstone circular table is arranged on the machine grinding oilstone rod main body; a first grinding surface is formed between the end part of the first grinding oilstone round table and the surface of the first sealing ring, and a first positioning surface is formed between the peripheral side wall of the first grinding oilstone round table and the first threaded washer; and a second grinding surface is formed between the peripheral side wall of the second grinding oilstone round table and the second sealing ring. The invention solves the problems of low inflation pressure and slow inflation speed at the outlet of the pressure reducer component, has novel material selection, simple and efficient design by utilizing the positioning appearance of the shape of the part, high grinding efficiency and good effect aiming at fluoroplastic materials, and simple and easy operation of the repairing method.
Description
Technical Field
The invention belongs to the technical field of pressure reducer repair, and particularly relates to a repair tool for a fluoroplastic valve port of an aircraft pressure reducer component and a repair method for a fluoroplastic valve port of the aircraft pressure reducer component.
Background
The gas pressure reducer is a mechanical device which can automatically adjust the opening degree of a valve port of the gas pressure reducer according to the gas pressure difference between the upstream and the downstream of the valve, so that the required gas pressure of the downstream outlet is obtained. The gas pressure reducer is widely applied to airplane lifesaving and oxygen systems, aerospace craft fuel tank pressure stabilizing systems, ground test bed gas source gas supply systems and the like, and has important control and regulation functions. The pressure reducer component is a gas pressure reducer in a composite form, and can realize gradual pressure reduction of gas pressure. The pressure reducer usually contains an elastic element sensitive to pressure change, the matching accuracy requirement of valve parts is high, and various problems such as inaccurate pressure regulation, slow response, pressure oscillation and leakage are easy to occur. In the long-term use process, under the impact force effect of the lock pin on the fluoroplastic, the cold flow property of the fluoroplastic leads the tight valve port to deform, at the moment, the lock pin is not tightly attached to the seal of the valve port, an uneven conical surface is formed, air leakage is easy to occur, and the outlet pressure cannot meet the requirement.
The pressure reducer component of a cabin cover system of a certain type of airplane is taken as a typical representative, and due to the particularity of the design structure of a product and the lack of understanding of the mechanical characteristics of engineering maintenance personnel, fault phenomena such as low pressure reducing outlet pressure, slow air inflation of a cabin sealing hose, unstable installation working performance and the like occur occasionally in maintenance work over the years, and the repair task progress of aviation equipment is seriously retarded. Research on the performance and the repair technology of the pressure reducer assembly becomes a necessary and critical subject for improving the repair capability of aviation equipment.
The pressure reducer assembly in the cabin cover system is used for pneumatic operation of the cabin cover, and simultaneously plays a role in inflating the sealing hose and supplying pressure to the anti-icing system, so that once a product fails, the opening and closing functions of the cabin cover can be directly influenced, and even the cabin sealing fails and the anti-icing system cannot work normally. The operating system of the aircraft canopy is frequently used, the failure probability is relatively high, the inflation performance problem of the sealing hose of the pressure reducer assembly is the most common failure in the repair process of the pressure reducer assembly, and finally the inflation pressure and the inflation speed of the sealing hose are low. And this product mounted position is difficult for dismantling in some models, and it is huge to change trouble work load, can delay the execution of aircraft task even, and aerial secret losing influences flight safety. When the pressure reducer assembly is maintained in a factory, due to the fact that the performance of the pressure reducer assembly after being installed cannot meet the system debugging requirement, the accessories are frequently repaired, and a large amount of time and labor are consumed in the process of going up and down.
The research on the repair technology of the pressure reducer assembly is developed, a physical model of the working characteristics of the product is established through the analysis of the product structure principle and the system component relation, the fundamental factors influencing the working performance of the product are excavated, the targeted measures are taken in the product repair process, and the repair technical key of the component assembly is explored and grasped, so that the aims of reducing the fault occurrence frequency, stabilizing the product repair quality and improving the installation performance are fulfilled, the troubleshooting workload in the use and maintenance process of the aircraft cabin cover system is further reduced, and the improvement of the guarantee capability of modern aviation equipment is facilitated.
The pressure reducer is used as a pressure reduction and stabilization element in a fluid pipeline system, relates to various dynamic characteristics, and has certain complexity in the design process, so that the problems of insensitive pressure change response, pressure oscillation and the like occur in the using process, and the pressure reduction and stabilization element is a difficult point in research. Due to the influence of various factors such as the material and structural characteristics of parts, the requirements for the process in the manufacturing process are high, and particularly for parts of a pressure reducer with high flow and high precision requirements, the problems of pressure regulating functional failure, internal and external leakage and the like are also important in research.
The stability control of the pressure reducer in the aerospace field draws wide attention at home and abroad. An ultrahigh pressure pneumatic proportional pressure reducer is designed by Wangxiangyin of university of Zhejiang, a nonlinear mathematical model of the system is established, and an effective method for improving the precision of output pressure is found through simulation; the profile design method and performance prediction of the large-scale wind tunnel pressure regulating valve are provided by the Huang Zhilong and the like in China aerodynamic research and development center, and a double-valve parallel connection adjusting mode is provided aiming at the pressure adjusting requirement under large flow; the Peking space power research institute has a good wish to establish a reverse unloading type pressure reducer dynamic simulation model, and utilizes AMESim simulation to obtain influence factors of the dynamic characteristics of the pressure reducer and provide reasonable improvement measures; the Liujun establishes a dynamic mathematical model of the pressure reducer, and adopts a four-step Runge-Kutta method to respectively simulate the dynamic process and common faults of the pressure reducer, thereby providing an optimal design scheme of the pressure reducer; the Afshari adopts a baud diagram simulation technology to research the nonlinear problem in the pressure reducer; ciraolo establishes a supercharging transient process mathematical model and analyzes the problem of the vibration of the pressure reducer.
In the field of gas dynamic characteristic research, the application of computational fluid dynamics is becoming mature. In order to research the dynamic characteristics of the valve in the opening and closing process, the HOSANGADI and CAVALLO adopt a dynamic grid technology to simulate the coupling characteristics of the internal structure motion and the fluid of the valve, and the solid motion model adopted by the valve is mainly a rigid body model with a known motion rule at present. The CFD technology adopted in China to research the flow characteristics of the valve is still mainly a constant problem, and a characteristic line method is mainly adopted to research transient problems such as water hammer, but the method is difficult to obtain the rule that the flow field parameters in a three-dimensional space change along with time, and has certain limitations.
Related research is also carried out domestically aiming at the technical problem of the repair of the pressure reducer component. The forest of the national defense and technology university and the like perform numerical simulation on vibration faults in the working process of the large-flow gas pressure reducer, and finally the stability of the output response of the pressure reducer is improved in a mode of reducing the area of the inlet of the control cavity; numerical simulation calculation is carried out on the stability problem of the pressure reducer of the aircraft pressurization system by Sun Ice and the like of Beijing aerospace university, and the simulation result shows that the stability of the pressure reducer can be improved by preferentially reducing the mass of a secondary valve core of the pressure reducer or increasing the rigidity of a diaphragm; the technical scheme includes that the university of defense science and technology, such as the university of mugwort, carries out modeling analysis and experimental verification aiming at the problem of the upward drifting of the outlet pressure of a large-flow pressure reducer in the large-flow long-range test process, and designs a control system to control the gas pressure in a cavity, so that the upward drifting of the outlet pressure of the pressure reducer is successfully inhibited; yangkai et al analyzed the cause of the leakage in the low-temperature test of the pressure reducer and solved the fault from the perspective of increasing the compression amount of the O-shaped rubber ring; the influence of the change of the structural parameters of the air pressure reducer on the displacement-pressure characteristic of the air pressure reducer is analyzed by Wuran and the like of northwest industrial university by adopting a computational fluid dynamics method, characteristic curves under different structural parameters are obtained, and finally, the analysis result shows that the characteristic of the air pressure reducer can meet the index requirement as far as possible by modifying the downstream angle and the maximum diameter of the air needle.
The research on various aspects of the gas pressure reducer has already been carried out, and certain fault diagnosis and repair technology research is carried out, however, the research on the multiple reasons of the fault of the pressure reducer component of the aircraft cockpit cover operating system and the practical repair technology improvement is relatively few, the diagnosis and summary of the performance fault rule of the pressure reducer component of the aircraft cockpit cover operating system and the research on the practical repair technology are still lacked, and therefore, the repair tool and the repair method for the fluoroplastic valve port of the aircraft pressure reducer component have practical significance in the above problems.
Disclosure of Invention
The repairing tool and the repairing method for the fluoroplastic valve port of the airplane pressure reducer component solve the problems of low inflation pressure and slow inflation speed of the outlet of the pressure reducer component, are novel in material selection, are simple and efficient in design by utilizing the positioning appearance of the shape of a part, and are high in grinding efficiency and good in effect aiming at fluoroplastic materials, and the repairing method is simple, convenient and easy to operate.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a repairing tool for fluoroplastic valve ports of an aircraft pressure reducer assembly, which is used for repairing fluoroplastic sealing rings in a front cavity A of a first saddle and a rear cavity B of a second saddle which are adjacent to each other between sealing valve ports on a pressure reducer in a pressure reducer assembly of an aircraft cabin cover system, and comprises a grinding oilstone rod main body, a first grinding oilstone round table, a second grinding oilstone round table and a grinding oilstone positioning bulge, wherein the first grinding oilstone round table is arranged at one end of the grinding oilstone rod main body, is abutted against a first sealing ring in the front cavity A and is extruded with a first thread gasket in the front cavity A, the second grinding oilstone round table is arranged at the other end of the grinding oilstone rod main body, and the grinding oilstone positioning bulge is arranged at the end part of the second grinding oilstone round table, is abutted against a second thread gasket in the rear cavity B and is extruded with a second sealing ring in the rear cavity;
a first grinding surface is formed between the end part of the first grinding oilstone round table and the surface of the first sealing ring, and a first positioning surface is formed between the peripheral side wall of the first grinding oilstone round table and the first threaded gasket;
and a second grinding surface is formed between the peripheral side wall of the second grinding oilstone round table and the second sealing ring, and a second positioning surface is formed between the grinding oilstone positioning bulge and the surfaces of the peripheral side wall of the second sealing ring and the second threaded washer.
Further, the length of the grinding oilstone rod main body is 60-100mm, the diameter of the grinding oilstone rod main body is 4-6mm, the height of the first grinding oilstone circular table is 1.6-2mm, and the inclined included angle of the outer side wall of the first grinding oilstone circular table is 20-40 degrees; the height of the second grinding oilstone circular truncated cone is 1.8-2.2mm, the inclination angle of the outer side wall of the second grinding oilstone circular truncated cone is 60-80 degrees, the height of the grinding oilstone positioning bulge is 1.3-1.7mm, and the diameter of the grinding oilstone positioning bulge is 0.8-1.2 mm.
A method for repairing a fluoroplastic valve port of an aircraft pressure reducer component comprises the following steps:
s01, separating the low-pressure reducer from the pressure reducer assembly of the aircraft cabin cover system and carrying out model simplification analysis: during the working process of the low-pressure reducer, in the initial state, the lock pin is separated from the sealing valve port under the combined action of the spring K1, the spring K21 and the spring K22, the axial clearance is set to be delta, and when the pressure is P1The high-pressure gas enters the preposed cavity A and then flows through the sealing valve port to enter the postposition cavity B to push the membrane sheet with the ejector rod to move upwards, the lock pin also moves upwards under the action of the spring K1, and the axial gap delta is reduced; when the pressure in the rear cavity B rises to a constant value pressure P2When the valve is opened, the lock pin is tightly attached to the sealing valve port to block gas from flowing into the rear cavity B, the axial gap delta is reduced to zero, and the outlet pressure P can be regulated by regulating the first ejector rod above the top locking nut2The value is that the lock pin is always tightly attached to the ejector rod with the ejector rod membrane in the process of moving along the axial direction, so that the lock pin 2 and the ejector rod with the ejector rod membrane are regarded as a whole, and the first ejector rod, the second ejector rod, the spring K21 and the spring K22 are regarded as a whole and simplified into a spring K2;
s02, carrying out stress analysis on the membrane with the ejector rod:
(1) assuming that no high-pressure gas flows into the front chamber A and the rear chamber B in the initial state, the compression amounts of the spring K1 and the spring K2 are delta 1 and delta 2, and K1And K2Respectively, the elastic modulus, the effective area of the membrane with the ejector rod is A, the axial gap between the lock pin and the sealing valve port is delta, and the supporting force of the support on the first ejector rod is F in an initial stateBranch standThe force of the spring K1 and the spring K2 is F1 *And F2 *The membrane with the ejector rod is stressed in a balanced manner;
Fbranch stand+F1 *＝F2 *Namely: fBranch stand+K1*δ1＝K2*δ2(1.1)
(2) Suppose that when the gas pressure in the rear chamber B rises to P2When the membrane with the ejector rod moves delta along the axial direction, the lock pin just closes the sealing valve port, namely the sealing valve port and the lock pin have no interaction force, the membrane with the ejector rod is stressed in balance, and after the spring K21 and the spring K22 move delta, the elasticity of the membrane with the ejector rod is F respectively1And F2The initial spring values of the spring K21 and the spring K22 are F1 *And
a' is P1Effective contact area with the membrane with the ejector pin, A is P2Effective contact area with the membrane, when:
the following can be obtained:
because F1 *And
all of which are initial values inconvenient, and the effective contact area A is a fixed value, then the outlet pressure P is2In relation to the gaps δ, a'; since δ, a' are related to the effective sealing radius of the sealing valve port, respectively, the effective sealing radius of the sealing valve port will have an effect on the outlet pressure;
(3) before the lock pin does not seal the sealing valve port, when gas passes through the axial gap between the lock pin and the sealing valve port, the first ejector rod, the second ejector rod, the spring K21, the spring K22 and the membrane with the ejector rod are regarded as a whole, and the membrane with the ejector rod is subjected to the gas pressure P of a high-pressure chamber1Pressure on the bottom of the pin FA、P2Pressure on the ejector diaphragm FBSpring K21 and spring K22 push-on diaphragm pressure F2Spring K1 push-rod diaphragm pressure F1(ii) a Let the area of the ejector rod membrane be A1The large end area of the lock pin is A2The small end area of the lock pin is A3Then, the stress of the ejector rod membrane in the whole sealing process is as follows:
(FA+FB+F1)-F2ma, i.e.: [ P ]1A2+P2(A1-A3)+F1]-F2＝ma (1.4)
Obtaining:
due to F2Gradually increases along with the passage of the lock pin (02), F1P is negligible due to too small force value1With the decreasing of the pressure of the gas cylinder, the formula of 1.5 can obtain P2With P1I.e. the pressure reducer outlet pressure increases gradually over time, in the 1.3 formula a' ═ R2,A＝πr2Then, equation 1.3 can be written as:
in the above formula, F1 *And
are all initial values constant, k1、k2R is constant, the outlet pressure P2Related to the gaps δ, R, δ also being related to R, in order to quantify R for P2Will be assumed hereinafter that R is increased by one time, estimating P2Increasing the multiple;
(b) when R ═ R1When the lock pin (02) moves forward by a distance delta, then:
(b) when R ═ R2＝2R1While the lock pin (02) moves forward (delta + delta)1) And (3) distance, then:
wherein, the included angle between the sealing valve port and the axis of the lock pin is 15 degrees
Then:
in formula 1.9, K1＝3.3kN/m,K2＝0.42kN/m，δ＝0.6mm，R11mm, to estimate the ratio in 1.9, P is taken1Calculated under 1.9MPa
It can be seen that when R is doubled, the outlet pressure P is doubled2By a factor of 4.2, so R is the outlet pressure P2The influence of (2) is large, and the magnitude of R must be controlled as much as possible.
S03, selecting a grinding oilstone repairing tool with proper size and model according to the result of the stress analysis of the ejector rod membrane: the radius of the first grinding oilstone round table and the radius of the second grinding oilstone round table of the repairing tool are the same as the size and the size of the circle with the effective contact area of the ejector rod diaphragm;
s04, repairing operation: and (3) grinding the fluoroplastic valve port by using the selected grinding oilstone repairing tool under the lubrication of silicone oil, and removing the fluoroplastic at the convex part in the fluoroplastic valve port to form a smooth conical surface so as to finish repairing.
The invention has the following beneficial effects:
the invention uses the processed oilstone as a tool to grind and repair the fluoroplastic valve port of the airplane pressure reducer component, and calculates the stress of the membrane with the ejector rod before repair to determine a proper repair tool, thereby solving the problems of low inflation pressure and slow inflation speed of the outlet of the pressure reducer component; the repairing tool disclosed by the invention is novel in grinding oilstone material selection, simple and efficient in design by utilizing the positioning appearance of the shape of the part, high in grinding efficiency and good in effect aiming at the fluoroplastic material, and the repairing method is simple, convenient and easy to operate.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a repair tool for fluoroplastic valve ports of an aircraft pressure reducer assembly according to the present invention;
FIG. 2 is a schematic view of the fitting structure of the repair tool with a fluoroplastic seal ring in the forechamber A;
FIG. 3 is an enlarged view of a portion of FIG. 2 at position II;
FIG. 4 is a schematic view of the fitting structure of the present restoration tool with a fluoroplastic seal ring in the rear chamber B;
FIG. 5 is an enlarged view of a portion of FIG. 4 at location I;
FIG. 6 is a simplified model diagram of a pressure reducer;
FIG. 7 is a force diagram of a membrane with a mandril in an initial state;
FIG. 8 is a force diagram of the membrane with the ejector pin in the final state;
FIG. 9 is a force diagram of the membrane with the push rod before the sealing valve port is not closed;
FIG. 10 is a schematic view of the assembly of the locking pin and the valve seat;
FIG. 11 is a schematic structural view of an aircraft canopy system pressure reducer assembly being repaired by the present repair tool;
FIG. 12 is a schematic view of the construction of the low pressure reducer of FIG. 11;
FIG. 13 is a block diagram of the modular differential representation of FIG. 11;
FIG. 14 shows the sealing valve port at R1A lower cross-sectional view;
FIG. 15 shows the sealing valve port at R1And R2A cross-sectional view of the lower displacement representation;
FIG. 16 is an illustration of the effect of the sealing valve port in a first failure mode;
FIG. 17 is an illustration of the effect of the sealing valve port in a second damaged state;
FIG. 18 is an illustration of the effect of the sealing valve port in a third damaged state;
FIG. 19 is a process diagram illustrating the method of repairing a fluoroplastic valve port of an aircraft pressure reducer assembly according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1-grinding oilstone rod main body, 101-second grinding oilstone round table, 102-grinding oilstone positioning bulge, 103-first grinding oilstone round table, 2-first saddle, 201-first sealing ring, 202-first thread gasket, 203-first grinding surface, 204-first positioning surface, 3-second saddle, 301-second sealing ring, 302-second thread gasket, 303-second grinding surface, 304-second positioning surface, 01-spring K1, 02-lock pin, 03-ejector membrane, 04-spring K21, 05-second ejector rod, 06-spring K22, 07-first ejector rod, 08-lock nut, 09-sealing valve port, A-high pressure reducer, B-high pressure safety valve, C-one-way valve, d-low pressure reducer, E-low pressure safety valve;
p1, P2, P21-screw, P3-spring seat, P4-cup, P5, P17, P20, P30, P32-spring, P6, P18-pin, P7, P14, P26, P28, P40-sealing ring, P8, P24-bellows, P9-nut, P9-bushing, P9-bolt, P9-, door seat, P9-protection ring, P9-locking pin, P9-stopper, P9-round cover, P9-spring pad, P9-low pressure safety valve, P9-valve assembly, P9-gasket, P9-right angle pipe joint, P9-seat, P9-fastening screw, P9-high pressure safety valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "inner", "one end", "the other end", "peripheral sidewall", "surface", and the like, indicate an orientation or positional relationship merely for convenience of description and simplicity of description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Referring to fig. 1-18, the tool for repairing fluoroplastic valve port of pressure reducer component of airplane according to the present invention, the repairing tool is used for repairing fluoroplastic sealing rings in a front cavity A of a first saddle 2 and a rear cavity B of a second saddle 3 which are adjacent between sealing valve ports 09 on a pressure reducer assembly in an airplane canopy system, and comprises a grinding oilstone rod main body 1, a first grinding oilstone circular table 103, a second grinding oilstone circular table 101 and a grinding oilstone positioning bulge 102, wherein the first grinding oilstone circular table 103 is arranged at one end of the grinding oilstone rod main body 1, is abutted against a first sealing ring 201 in the front cavity A and is extruded with a first threaded gasket 202 in the front cavity A, the second grinding oilstone circular table 101 is arranged at the other end of the grinding oilstone rod main body 1, is abutted against a second threaded gasket 302 in the rear cavity B and is extruded with a second sealing ring 301 in the rear cavity B, and the grinding oilstone positioning bulge 102 is arranged at the end of the second grinding oilstone circular table 101;
a first grinding surface 203 is formed between the end part of the first grinding oilstone round platform 103 and the surface of the first sealing ring 201, and a first positioning surface 204 is formed between the peripheral side wall of the first grinding oilstone round platform 103 and the first threaded washer 202;
a second grinding surface 303 is formed between the peripheral side wall of the second grinding whetstone circular truncated cone 101 and the second seal ring 301, and a second positioning surface 304 is formed between the grinding whetstone positioning protrusion 102 and the inner peripheral side wall of the second seal ring 301 and the surface of the second threaded gasket 302.
Wherein, the length of the grinding oilstone stick main body 1 is 80mm and the diameter thereof is 5mm, the height of the first grinding oilstone round platform 103 is 1.8mm, and the inclined angle of the outer side wall thereof is 30 degrees; the height of the second grinding oilstone circular truncated cone 101 is 2mm, the inclination angle of the outer side wall of the second grinding oilstone circular truncated cone is 70 degrees, the height of the grinding oilstone positioning bulge 102 is 1.5mm, and the diameter of the grinding oilstone positioning bulge is 1 mm.
As shown in fig. 2 to 19, a method for repairing a fluoroplastic valve port of an aircraft pressure reducer component comprises the following steps:
s01, separating the low-pressure reducer from the pressure reducer component of the aircraft cabin cover system and carrying out model simplification analysis: during the working process of the low-pressure reducer, in the initial state, the lock pin 02 is separated from the sealing valve port 09 under the combined action of the spring K101, the spring K2104 and the spring K226, the axial gap is set to be delta, and when the pressure is P1The high-pressure gas enters the front cavity A and then flows through the sealing valve port 09 to enter the rear cavity B, the membrane 03 with the ejector rod is pushed to move upwards, the lock pin 02 also moves upwards under the action of the spring K101, and the axial gap delta is reduced; when the pressure in the rear cavity B rises to a constant value pressure P2When the valve is opened, the lock pin 02 is tightly attached to the sealing valve port 09 to block gas from flowing into the rear cavity B, the axial gap delta is reduced to zero, and the outlet pressure P can be adjusted by adjusting the first ejector rod 07 above the top locking nut 082The value is that the lock pin 02 is always tightly connected with the ejector rod membrane 03 in the axial moving processSince the lock pin 2 and the stem with the stem diaphragm 03 are closely attached to each other, the first stem 07 and the second stem 05, the spring K2104 and the spring K226 are integrally formed, and the spring K2 is simplified; the pressure reducer component is a reverse unloading type pressure reducer with a two-stage pressure reducing function, a sensitive element in the pressure reducer component is a metal diaphragm capsule, the length of a corrugated pipe is changed according to the pressure difference between upstream and downstream gases, and therefore the opening degree of the valve is adjusted, as shown in fig. 13, the pressure reducer component is partitioned according to the specific structural schematic diagrams of fig. 11-12 to form 5 large components including a high-pressure reducer A, a high-pressure safety valve B, a one-way valve C, a low-pressure reducer D and a low-pressure safety valve E; high pressure reducer A and low pressure reducer D's structure is similar, and the gaseous one-level decompression back that passes through high pressure reducer A of import leads to cabin lid control switch from one-level decompression export on the one hand, and on the other hand gets into low pressure reducer D through check valve C and carries out the second grade decompression. The high-pressure safety valve B and the low-pressure safety valve E are structurally different and respectively play a role in overpressure protection for the high-pressure reducer A and the low-pressure reducer D, and the structure of the low-pressure reducer is shown in figure 12;
s02, carrying out stress analysis on the membrane 02 with the ejector rod:
(1) setting that in an initial state, no pressure is supplied in a product in the initial state, the lock pin 02 leaves the valve seat under the action of the ejector rod 07 on the diaphragm capsule, and a gap is formed between the conical surface of the lock pin 02 and a fluoroplastic valve port of the valve seat; no high pressure gas flows into the front chamber A and the rear chamber B, the compression amounts of the spring K101 and the spring K2 are delta 1 and delta 2 respectively, and K1And K2Respectively, the elastic modulus, the effective area of the membrane 03 with the ejector rod is A, the axial gap between the lock pin 02 and the sealing valve port 09 is delta, and in an initial state, the supporting force of the support on the first ejector rod 07 is FBranch standThe force of the spring K101 and the spring K2 is F1 *And
the membrane 03 with the ejector rod is stressed in a balanced manner;
(2) Suppose that when the gas pressure in the rear chamber B rises to P2When the membrane sheet 03 with the ejector rod is displaced delta along the axial direction, the lock pin 02 just seals the sealing valve port 09, namely the sealing valve port 09 has no interaction force with the lock pin 02, the membrane sheet 03 with the ejector rod is balanced in stress, and after the spring K2104 and the spring K226 are displaced delta, the elastic force borne by the membrane sheet 03 with the ejector rod is F1And F2The initial spring values of the spring K2104 and the spring K226 are F1 *Anda' is P1Effective contact area with the membrane sheet 03 with the ejector rod, A is P2Effective contact area with the membrane, when:
the following can be obtained:
because F1 *Andall of which are initial values inconvenient, and the effective contact area A is a fixed value, then the outlet pressure P is2In relation to the gaps δ, a'; since delta and A' are respectively related to the effective sealing radius of the sealing valve port (09), the effective sealing radius of the sealing valve port (09) can influence the outlet pressure;
(3) before the lock pin 02 does not seal the sealing valve port 09, when gas passes through an axial gap between the lock pin 02 and the sealing valve port 09, the first ejector pin 07, the second ejector pin 05, the spring K2104, the spring K226 and the ejector-equipped diaphragm 03 are regarded as a whole, and the ejector-equipped diaphragm 03 is subjected to high-pressure chamber gas pressure P1Pressure F on the bottom of the locking pin 02A、P2Pressure F on the ejector membrane 03BSpring K2104 and spring K226 pressure F on the push-rod membrane 032Spring K101 pressure F against ejector membrane 031(ii) a Let the area of the ejector rod membrane 03 be A1The large end area of the lock pin 02 is A2The small end area of the lock pin 02 is A3Then, the stress of the ejector rod membrane 03 in the whole sealing process is as follows:
(FA+FB+F1)-F2ma, i.e.: [ P ]1A2+P2(A1-A3)+F1]-F2＝ma (1.4)
Obtaining:
due to F2Gradually increasing as the lock pin 02 goes, F1P is negligible due to too small force value1With the decreasing of the pressure of the gas cylinder, the formula of 1.5 can obtain P2With P1I.e. the pressure reducer outlet pressure increases gradually over time, in the 1.3 formula a' ═ R2,A＝πr2Then, equation 1.3 can be written as:
in the above formula, F1 *And
are all initial values constant, k1、k2R is constant, the outlet pressure P2Related to the gaps δ, R, δ also being related to R, in order to quantify R for P2Will be assumed hereinafter that R is increased by one time, estimating P2Increasing the multiple;
(c) when R ═ R1When the lock pin (02) moves forward by a distance delta, then:
(b) when R ═ R2＝2R1While the lock pin (02) moves forward (delta + delta)1) And (3) distance, then:
wherein, the included angle between the seal valve port 09 and the axis of the lock pin 02 is 15 degrees, then
Then:
in formula 1.9, K1＝3.3kN/m,K2＝0.42kN/m，δ＝0.6mm，R11mm, to estimate the ratio in 1.9, P is taken1Calculated under 1.9MPaIt can be seen that when R is doubled, the outlet pressure P is doubled2By a factor of 4.2, so R is the outlet pressure P2The influence of (2) is large, and the magnitude of R must be controlled as much as possible.
S03, selecting a grinding oilstone repairing tool with proper size and model according to the result of the stress analysis of the ejector rod membrane 02: the radius of a first grinding oilstone round table 103 and a second grinding oilstone round table 101 of the repairing tool is the same as the radius of a circle with the effective contact area of the ejector rod membrane 03 in size and size;
s04, repairing operation: grinding a fluoroplastic valve port by a selected grinding oilstone repairing tool under the lubrication of silicone oil, grinding a fluoroplastic sealing ring in a valve seat according to a manual rotary grinding method according to figures 2-5 to eliminate a deformed part of the edge of the conical valve port, changing the damaged state needing to be repaired in shape to include figures 16-18, repairing the size and the edge shape of the valve port, recovering the sealing property of the conical valve port, ensuring the stability of the flow and the pressure of a pressure reduction outlet, removing fluoroplastic at a convex part in the fluoroplastic valve port to form a smooth conical surface, and finishing the repairing.
And S01-S02, the gas of the first stage decompression enters a second stage decompression cavity through a gap between the lock pin and the valve seat, acts on the metal bellows of the bellows, the bellows compresses and drives the ejector rod to displace, the opening degree of the valve is reduced along with the accumulation of the air pressure of the decompression cavity, and when the pressure of the decompression cavity is balanced with the set spring force, the valve is completely closed. When the nitrogen in the second-stage decompression cavity is lost due to the supply of the nitrogen into the downstream space, the pressure in the decompression cavity is reduced, the load on the diaphragm capsule is reduced, the ejector rod reversely displaces to jack the valve, so that the nitrogen with the first-stage decompression can continuously enter the second-stage decompression cavity, and the decompression is performed in a circulating manner.
The pressure output of the pressure reducer assembly is a dynamic process, the valve is in an opening state under the action of the bellows ejector rod and the spring before the upstream and downstream pressure difference reaches an equilibrium state, the throttling effect of the valve determines the air flow movement condition in the system, and therefore the main components forming the conical valve, namely the structure and the state of the lock pin and the valve seat are analyzed as shown in fig. 10. The lock pin is made of 2Cr13 stainless steel material, the working part of the lock pin matched with the valve seat is a 30-degree conical surface, and the surface roughness requirement reaches Ra0.1 mu m. The valve seat is characterized in that a sealing gasket is fixed on the saddle through a threaded gasket, and the part matched with the lock pin is an inner hole of the fluoroplastic sealing gasket. Because the lock pin is contacted with the relatively soft fluoroplastic material in the product, if no hard foreign matter is interfered at the valve port, the conical surface of the lock pin is not damaged normally; the shape and the texture of the valve port of the fluoroplastic sealing gasket in the valve seat are possibly changed after long-time work and the influence of the change of the ambient temperature, so that the valve port becomes an influencing factor with larger state uncertainty. Aiming at the problem that the outlet flow and the pressure of the pressure reducer component are unstable and finally show that the inflation pressure is low and the inflation speed is slow, the relationship between the outlet pressure and the inlet pressure of the pressure reducer is obtained by adopting a model analysis method, and the correctness of the pressure reducer valve port repairing method is proved by applying the method.
The invention uses the processed oilstone as a tool to grind and repair the fluoroplastic valve port of the airplane pressure reducer component, and calculates the stress of the membrane with the ejector rod before repair to determine a proper repair tool, thereby solving the problems of low inflation pressure and slow inflation speed of the outlet of the pressure reducer component; the repairing tool disclosed by the invention is novel in grinding oilstone material selection, simple and efficient in design by utilizing the positioning appearance of the shape of the part, high in grinding efficiency and good in effect aiming at the fluoroplastic material, and the repairing method is simple, convenient and easy to operate.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (3)
1. The utility model provides a repair instrument of aircraft pressure reducer subassembly fluoroplastics valve port, this repair instrument is used for among the pressure reducer subassembly of aircraft cabin cover system pressure reducer the adjacent preceding chamber A of first saddle (2) and the fluoroplastics sealing washer in the rearmounted chamber B of second saddle (3) carry out prosthetic instrument, its characterized in that:
the repairing tool comprises a grinding oilstone rod main body (1), a first grinding oilstone round table (103) which is arranged at one end of the grinding oilstone rod main body (1), is abutted against a first sealing ring (201) in the front cavity A and is extruded with a first thread gasket (202) in the front cavity A, a second grinding oilstone round table (101) which is arranged at the other end of the grinding oilstone rod main body (1), and a grinding oilstone positioning bulge (102) which is arranged at the end part of the second grinding oilstone round table (101), is abutted against a second thread gasket (302) in the rear cavity B and is extruded with a second sealing ring (301) in the rear cavity B;
a first grinding surface (203) is formed between the end part of the first grinding oilstone round table (103) and the surface of the first sealing ring (201), and a first positioning surface (204) is formed between the peripheral side wall of the first grinding oilstone round table (103) and the first threaded washer (202);
and a second grinding surface (303) is formed between the peripheral side wall of the second grinding oilstone round table (101) and the second sealing ring (301), and a second positioning surface (304) is formed between the grinding oilstone positioning bulge (102) and the surfaces of the inner peripheral side wall of the second sealing ring (301) and the second threaded gasket (302).
2. A tool for repairing a fluoroplastic valve port of an aircraft pressure reducer assembly according to claim 1, wherein the length of the grinding oilstone rod body (1) is 60-100mm, the diameter of the grinding oilstone rod body is 4-6mm, the height of the first grinding oilstone circular truncated cone (103) is 1.6-2mm, and the included angle of inclination of the outer side wall of the first grinding oilstone circular truncated cone is 20-40 degrees; the height of the second grinding oilstone round table (101) is 1.8-2.2mm, the inclination angle of the outer side wall of the second grinding oilstone round table is 60-80 degrees, the height of the grinding oilstone positioning bulge (102) is 1.3-1.7mm, and the diameter of the grinding oilstone positioning bulge is 0.8-1.2 mm.
3. A method of repairing a fluoroplastic valve port of an aircraft pressure reducer assembly as claimed in any one of claims 1 to 2, comprising the steps of:
s01, separating the low-pressure reducer from the pressure reducer assembly of the aircraft cabin cover system and carrying out model simplification analysis: during the working process of the low-pressure reducer, in an initial state, the lock pin (02) is separated from the sealing valve port (09) under the combined action of the spring K1(01), the spring K21(04) and the spring K22(6), the axial clearance is set to be delta, and when the pressure is P1The high-pressure gas enters the front cavity A and then flows through the sealing valve port (09) to enter the rear cavity B, the membrane (03) with the ejector rod is pushed to move upwards, the lock pin (02) also moves upwards under the action of the spring K1(01), and the axial gap delta is reduced; when the pressure in the rear cavity B rises to a constant value pressure P2When the valve is used, the lock pin (02) is tightly attached to the sealing valve port (09) to block gas from flowing into the rear cavity B, the axial gap delta is reduced to zero, and the outlet pressure P can be regulated by regulating the first ejector rod (07) above the top locking nut (08)2The value is such that the locking pin (02) is in axial movement with the membrane (03) with the ejector pinThe ejector rods are tightly attached all the time, so the lock pin 2 and the ejector rod with the ejector rod membrane (03) are regarded as a whole, the first ejector rod (07), the second ejector rod (05), the spring K21(04) and the spring K22(6) are regarded as a whole, and the whole is simplified into a spring K2;
s02, carrying out stress analysis on the membrane (02) with the ejector rod:
(1) assuming that no high-pressure gas flows into the front chamber A and the rear chamber B in the initial state, the compression amounts of the spring K1(01) and the spring K2 are δ 1 and δ 2, and K1And K2Respectively, the elastic modulus of the diaphragm is A, the effective area of the diaphragm (03) with the ejector rod is A, the axial clearance between the lock pin (02) and the sealing valve port (09) is delta, and in an initial state, the supporting force of a support borne by the first ejector rod (07) is FBranch standThe force of spring K1(01) and spring K2 is F1 *And
the membrane (03) with the ejector rod is stressed in a balanced manner;
(2) Suppose that when the gas pressure in the rear chamber B rises to P2When the membrane (03) with the ejector rod is displaced delta along the axial direction, the lock pin (02) just closes the sealing valve port (09), namely the sealing valve port (09) and the lock pin (02) have no interaction force, the membrane (03) with the ejector rod is stressed in a balanced manner, and after the spring K21(04) and the spring K22(6) are displaced delta, the elasticity of the membrane (03) with the ejector rod is F respectively1And F2The initial spring values of the spring K21(04) and the spring K22(6) are F1 *And
a' is P1Effective contact area with the membrane (03) with the mandril, A is P2Effective contact area with the membrane, when:
the following can be obtained:
because F1 *And
all of which are initial values inconvenient, and the effective contact area A is a fixed value, then the outlet pressure P is2In relation to the gaps δ, a'; since delta and A' are respectively related to the effective sealing radius of the sealing valve port (09), the effective sealing radius of the sealing valve port (09) can influence the outlet pressure;
(3) before the lock pin (02) does not seal the sealing valve port (09), when gas passes through an axial gap between the lock pin (02) and the sealing valve port (09), the first ejector rod (07), the second ejector rod (05), the spring K21(04), the spring K22(6) and the ejector rod-containing diaphragm (03) are regarded as a whole, and the ejector rod-containing diaphragm (03) is subjected to high-pressure chamber gas pressure P1Pressure F on the bottom of the locking pin (02)A、P2Pressure F on the ejector rod diaphragm (03)BSpring K21(04) and spring K22(6) with pressure F on the lift-pin membrane (03)2Spring K1(01) with pressure F on the lift-pin membrane (03)1(ii) a The area of the ejector rod membrane (03) is set as A1The large end area of the lock pin (02) is A2The small end area of the lock pin (02) is A3And then the stress of the mandril membrane (03) in the whole sealing process is as follows:
(FA+FB+F1)-F2ma, i.e.: [ P ]1A2+P2(A1-A3)+F1]-F2＝ma (1.4)
Obtaining:
due to F2Gradually increases along with the passage of the lock pin (02), F1P is negligible due to too small force value1Along with the gas cylinderThe decrease in pressure is gradually reduced, and P is obtained from the formula 1.52With P1I.e. the pressure reducer outlet pressure increases gradually over time, in the 1.3 formula a' ═ R2,A＝πr2Then, equation 1.3 can be written as:
in the above formula, F1 *And
are all initial values constant, k1、k2R is constant, the outlet pressure P2Related to the gaps δ, R, δ also being related to R, in order to quantify R for P2Will be assumed hereinafter that R is increased by one time, estimating P2Increasing the multiple;
(a) when R ═ R1When the lock pin (02) moves forward by a distance delta, then:
(b) when R ═ R2＝2R1While the lock pin (02) moves forward (delta + delta)1) And (3) distance, then:
wherein, the included angle between the sealing valve port (09) and the axis of the lock pin (02) is 15 degrees, then
Then:
in formula 1.9, K1＝3.3kN/m,K2＝0.42kN/m，δ＝0.6mm，R1＝1mm，To estimate the ratio in equation 1.9, take P1Calculated under 1.9MPa
It can be seen that when R is doubled, the outlet pressure P is doubled2By a factor of 4.2, so R is the outlet pressure P2The influence of (2) is large, and the magnitude of R must be controlled as much as possible.
S03, selecting a grinding oilstone repairing tool with proper size and model according to the stress analysis result of the ejector rod membrane (02): the radius of a first grinding oilstone round table (103) and a second grinding oilstone round table (101) of the repairing tool is the same as the size and the size of the round radius of the effective contact area of the membrane (03) with the ejector rod;
s04, repairing operation: and (3) grinding the fluoroplastic valve port by using the selected grinding oilstone repairing tool under the lubrication of silicone oil, and removing the fluoroplastic at the convex part in the fluoroplastic valve port to form a smooth conical surface so as to finish repairing.
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| CN112265652A (en) * | 2020-09-10 | 2021-01-26 | 大连长丰实业总公司 | Maintenance method of airplane pipe joint |
| CN113927379A (en) * | 2021-10-29 | 2022-01-14 | 三门核电有限公司 | Method for repairing valve seat of electromagnetic valve and electromagnetic valve |
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