A self-cleaning multifunctional flap assembly

Abstract

The application discloses a self-cleaning multifunctional valve assembly, which comprises a valve, a bushing arranged outside the valve, a spring seat and an oil filter connected with the bushing respectively, a second hole and a third hole arranged on the side of the bushing, a fourth hole arranged on the side between the spring seat and the oil filter, an adjusting washer arranged in the fourth hole, a first hole arranged at one end of the valve, a big spring arranged at the other end of the valve, a cap arranged outside the oil filter, a small spring arranged in the oil filter, and a left valve oil passage cavity and a right valve oil passage cavity separated by a connecting part in the bushing. The application can realize the functions of cooling, cleaning and pressure boosting, reduces the influence of the ambient temperature rise on the turbine starter under the condition that the turbine starter does not work while the aero-engine works, and ensures the normal work of the turbine starter. Moreover, the pressure boosting function of the structure ensures that the fuel supplied to the turbine starter has a certain pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turbine starter, in particular to a self-cleaning multifunctional valve assembly for turbine starter. BACKGROUND

[0002] The gas turbine starter needs to have fuel pressurization function when starting; after starting, the aero-engine starts to work and the starter is in non-working state, in order to reduce the influence of environmental temperature rise on the stability of fuel flow for the next starting of the starter, self-cooling function is needed. At present, two sets of valve assemblies are needed to realize pressurization and self-cooling function, and fuel in the fuel tank needs to be introduced, so that the cleanliness cannot be guaranteed. The existing mechanism increases the overall weight of the product and the difficulty of maintenance during use. SUMMARY

[0003] The present application aims to provide a self-cleaning multifunctional valve assembly. It has cooling, cleaning and pressurization functions, can reduce the influence of environmental temperature rise on accessories and provide fuel with certain pressure and cleanliness.

[0004] The technical scheme of the present application is as follows: a self-cleaning multifunctional valve assembly, comprising a valve, a bushing arranged outside the valve, a spring seat and an oil filter connected to the bushing, a second hole and a third hole arranged on the side of the bushing, a fourth hole arranged on the side between the spring seat and the oil filter, an adjusting washer arranged in the fourth hole, a first hole arranged at one end of the valve, a large spring arranged at the other end of the valve, the other end of the large spring connected to the spring seat, a cap arranged outside the oil filter, a small spring arranged in the oil filter, the other end of the small spring connected to the cap, the inside of the bushing divided into a valve oil passage left cavity and a valve oil passage right cavity through a communication part, the valve oil passage right cavity communicating with the first hole and the second hole, and the valve oil passage left cavity communicating with the third hole and the fourth hole.

[0005] The self-cleaning multifunctional valve assembly described above, wherein the bushing is provided with a first sealing ring, a second sealing ring and a third sealing ring.

[0006] The self-cleaning multifunctional valve assembly described above, wherein the outer side of the cap is provided with a fourth sealing ring.

[0007] The self-cleaning multifunctional valve assembly described above, wherein the end of the valve provided with the first hole is connected to a support.

[0008] The self-cleaning multifunctional valve assembly described above, wherein one end of the small spring is arranged on the circumferential surface of the boss at the end face of the cap and is limited by the inner end face of the cap, and the other end of the small spring is arranged on the inner circumferential surface of the oil filter.

[0009] The self-cleaning multifunctional valve assembly described above, wherein the first hole is connected to high-pressure fuel, the second hole is connected to a metering valve, the third hole is connected to a low-pressure oil return cavity, and the fourth hole is connected to a fuel tank.

[0010] The present application realizes the functions of fuel pressurization, self-cleaning and self-cooling of the valve assembly through the cooperation of the first hole K1, the second hole K2, the third hole K3 and the fourth hole K4 on the bushing and the cap, and the left and right oil passage cavities of the valve inside the bushing 4. When the first hole K1 and the second hole K2 are communicated through the right oil passage cavity A of the valve, the valve realizes the function of fuel pressurization; when the third hole K3 and the fourth hole K4 are communicated through the left oil passage cavity B of the valve, the set oil filter device can realize self-cleaning during fuel circulation, and the valve realizes the functions of self-cleaning and cooling. Compared with the prior art, the valve assembly integrates the functions of fuel pressurization and fuel switching, which realizes the integrated design concept of the starting device, and the set filter device effectively improves the reliability of the starting device during use. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic diagram of the present application;

[0012] Figure 2 is a schematic diagram of each oil passage cavity in the valve assembly;

[0013] Figure 3 is a schematic diagram of the installation of the oil filter and the cap in the valve;

[0014] Figure 4 is a schematic diagram of the installation of the valve and the bushing in the valve.

[0015] The drawings show that: 1-oil filter; 2-spring seat; 3-large spring; 4-bushing; 5-valve; 6- support; 7-first sealing ring, 8-second sealing ring, 9-third sealing ring; 10-adjusting washer; 11-fourth sealing ring, 12-small spring; 13-cap; 14-communication part; K1-pump high-pressure fuel inlet; K2-bushing high-pressure fuel outlet after the pump; K3-low-pressure fuel outlet; K4-low-pressure fuel inlet; A-right oil passage cavity of the valve; B-left oil passage cavity of the valve; T1-right end face of the oil filter; T2-left end face of the bushing; T3-internal end face of the cap; T4-internal end face of the oil filter; T5-internal end face of the spring seat; T6-internal end face of the valve; E-circumferential surface of the cap boss; F-circumferential surface of the oil filter; G-circumferential surface of the spring seat; M-circumferential surface of the valve; D-outer diameter of the valve. DETAILED DESCRIPTION

[0016] The present application will be further described below in conjunction with the drawings and examples, but it is not as the basis for limiting the present application.

[0017] Example 1 of the present application: a self-cleaning multifunctional valve assembly, referring to Figures 1 to 4The device includes a valve 5, a bushing 4 on the outside of the valve 5, and a spring seat 2 and an oil filter 1 connected to the bushing 4. A second hole K2 and a third hole K3 are provided on the side of the bushing 4. A fourth hole K4 is provided on the side between the spring seat 2 and the oil filter 1. An adjusting washer 10 is provided inside the fourth hole K4. A first hole K1 is provided at one end of the valve 5. A large spring 3 is provided at the other end of the valve 5. The other end of the large spring 3 is connected to the spring seat 2. A cap 13 is provided on the outside of the oil filter 1. A small spring 12 is provided inside the oil filter 1. The other end of the small spring 12 is connected to the cap 13. The bushing 4 is divided into a valve oil passage left chamber B and a valve oil passage right chamber A by a connecting part 14. The valve oil passage right chamber A is connected to the first hole K1 and the second hole K2. The valve oil passage left chamber B is connected to the third hole K3 and the fourth hole K4.

[0018] The bushing 4 is provided with a first sealing ring 7, a second sealing ring 8 and a third sealing ring 9 for sealing with the outer shell.

[0019] The cap 13 is provided with a fourth sealing ring 11 on the outside for sealing the cap 13.

[0020] The valve 5 has a first hole K1 at one end connected to a support 6, which is used to limit the valve 5.

[0021] One end of the small spring 12 is mounted on the circumferential surface E of the boss on the end face of the cap 13, and is limited against the inner end face T3 of the cap. The other end of the small spring 12 is mounted on the inner circumferential surface F of the oil filter 1, thus fixing the small spring 12 between the cap 13 and the oil filter 1.

[0022] The first hole K1 is connected to high-pressure fuel, the second hole K2 is connected to the metering valve, the third hole K3 is connected to the low-pressure return oil chamber, and the fourth hole K4 is connected to the fuel tank.

[0023] like Figure 1 As shown, the cap 13 has a small protrusion inside, with a circumferential surface E. The left inner end face of the cap 13 is the inner end face T3, and the middle connecting part inside the oil filter 1 is the inner end face T4. The oil filter has a circumferential surface F. One end of the small spring 12 is mounted on the circumferential surface E of the cap protrusion, abutting against the inner end face T3 of the cap, and the other end is mounted on the circumferential surface F of the oil filter, abutting against the inner end face T4 of the oil filter. Through the action of the spring force and the selection of the adjusting washer 10, the right end face T1 of the oil filter 1 and the adjusting washer 10 are basically on the same plane, ensuring a gap of 0.03 to 0.10 mm. The left end face T2 of bushing 4 abuts against spring seat 2. The internal connecting part 14 of bushing 4 divides the oil passage space into the left oil passage chamber B and the right oil passage chamber A of valve. One end of the large spring 3 is mounted on the inner circumferential surface G of spring seat and abuts against the inner end face T5 of spring seat, and the other end is mounted on the inner circumferential surface M of valve and abuts against the inner end face T6 of valve. Support 6 is installed on the right end face of bushing 4 to limit the movement of valve 5.

[0024] Working principle: refer to Figure 1 and Figure 2 As shown in the pre-assembly, the third hole K3 on the bushing 4 and the fourth hole K4 on the cap 13 are in an open state, when the oil tank reaches the oil filter 1 through the fourth hole K4, the oil reaches the valve passage left cavity B of the valve 5 after being filtered, the valve passage left cavity B communicates with the third hole K3, and the fuel of the oil tank is communicated to the low-pressure oil return cavity through the third hole K3, realizing the cooling effect of the connected components in the oil circuit; when the fuel after the pump reaches a certain pressure, the high-pressure fuel reaches the valve passage right cavity A of the valve 5 through the first K1 hole of the valve, and the high-pressure fuel overcomes the spring force and the low-pressure fuel pressure to move the valve 5 to the left, so that the valve passage right cavity A communicates with the second hole K2 on the bushing 4, and the fuel is communicated to the metering valve through the second hole K2, realizing the pressure boosting function of the valve 5. The cooling and pressure boosting functions of the valve 5 cannot be realized at the same time, when the fourth hole K4 communicates with the third hole K3, the valve realizes the cleaning and cooling function; when the first hole K1 communicates with the second hole K2, the valve realizes the pressure boosting function.

[0025] The following is the derivation of the parameter setting relationship of the self-cleaning multifunctional valve assembly according to the application:

[0026] Let the high-pressure oil pressure after the pump to the first hole K1 be P1, the low-pressure fuel pressure to the fourth hole K4 of the oil filter 1 be P2, the spring force of the two springs be F, the force area of the valve passage left cavity B in the first hole K1 be S1, and the force area of the spring valve passage left cavity B be S2, when the valve is stable, the external force it receives is in a balanced state, that is:

[0027] (1)

[0028] (2)

[0029] As can be seen from the figure, the force area of the valve passage right cavity A is equal to that of the valve passage left cavity B

[0030] (3)

[0031] From formula (3), it can be seen that the first hole K1 communicates with the second hole K2, that is, the opening pressure of the valve must be not less than the value of the right end of formula (3), since the low-pressure fuel pressure P2 is a constant value when the valve is working, the opening pressure of the valve 5 is related to the spring force of the spring, when the spring is selected and the number of adjusting washers 10 is adjusted, the opening pressure of the valve 5 is a constant value, at this time the high-pressure fuel pressure only needs to be not less than this constant value, and the valve 5 can be opened. If the opening pressure of the valve 5 needs to be changed, only the adjusting washer 10 needs to be increased or decreased.

[0032] When the valve 5 is opened, the fuel flow through the valve is Q, that is

[0033] Q = μA (4)

[0034] Wherein the bushing oil area A = 2ab, the flow Q through the valve is:

[0035] (5)

[0036] In the formula:

[0037] P1 is the high pressure fuel pressure after the pump (unit; MPa);

[0038] P2 is the low pressure fuel pressure (unit; MPa);

[0039] F is the spring force (unit N);

[0040] D is the outer diameter of the valve (unit mm);

[0041] Q is the outlet flow value of the cooling fuel limit valve (unit L / h);

[0042] μ is the flow coefficient;

[0043] A is the oil area to the bushing type hole (unit mm 2 );

[0044] Z is the specific gravity of oil (unit g / cm 3 );

[0045] g is the acceleration of gravity (unit m / s 2 );

[0046] ΔP is the pressure difference (unit MPa);

[0047] a is the width of the bushing, which is a constant value (unit; mm);

[0048] b is the opening degree of the bushing (unit; mm);

[0049] P1 is the high pressure fuel pressure of the K1 hole (unit; MPa);

[0050] P3 is the fuel pressure to the bushing hole K2 (unit; MPa).

[0051] From formula (5), it can be seen that the cooling fuel limit valve assembly of the application, the outlet flow value of the valve is related to the width a of the valve bushing 4, the opening degree b of the valve 5, the high pressure fuel pressure P1 of the first hole K1 and the fuel pressure P3 of the second hole K2, by setting and adjusting these parameter values, the flow through the valve can reach the required value.

Claims

1. A self-cleaning multifunctional valve assembly, comprising a valve (5), characterized in that: A bushing (4) is provided on the outside of the valve (5). The bushing (4) is connected to the spring seat (2) and the oil filter (1) respectively. A second hole (K2) and a third hole (K3) are provided on the side of the bushing (4). A fourth hole (K4) is provided on the side between the spring seat (2) and the oil filter (1). An adjusting washer (10) is provided in the fourth hole (K4). A first hole (K1) is provided at one end of the valve (5). A large spring (3) is provided at the other end of the valve (5). The other end of the large spring (3) is connected to the spring seat (2). A cap (13) is provided on the outside of the oil filter (1). A small spring (12) is provided inside the oil filter (1). The other end of the small spring (12) is connected to the cap (13). The bushing (4) is divided into a valve oil passage left chamber (B) and a valve oil passage right chamber (A) by a connecting part (14). The valve oil passage right chamber (A) is connected to the first hole (K1) and the second hole (K2). The valve oil passage left chamber (B) is connected to the third hole (K3) and the fourth hole (K4). One end of the small spring (12) is mounted on the circumferential surface (E) of the boss on the end face of the cap (13) and is limited by the inner end face (T3) of the cap. The other end of the small spring (12) is mounted on the inner circumferential surface (F) of the oil filter (1). The first hole (K1) is connected to the high-pressure fuel, the second hole (K2) is connected to the metering valve, the third hole (K3) is connected to the low-pressure return oil chamber, and the fourth hole (K4) is connected to the oil tank.

2. The self-cleaning multifunctional valve assembly according to claim 1, characterized in that: The bushing (4) is provided with a first sealing ring (7), a second sealing ring (8) and a third sealing ring (9).

3. The self-cleaning multifunctional valve assembly according to claim 1, characterized in that: The valve (5) has a first hole (K1) at one end connected to a support (6).

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