Ram air conversion valve for aircraft environmental control system and aircraft environmental control system

Abstract

The present invention provides a ram air switching valve for an aircraft environmental control system and an aircraft environmental control system. The ram air switching valve comprises an outer shell and an inner tube. The inner tube is disposed in the outer shell. The outer shell has a ram air inlet pipe through which ram air can enter the outer shell. An air bleed port is disposed on the inner tube at a position opposite to the ram air inlet pipe. A one-way valve is disposed at the air bleed port. The one-way valve can open the air bleed port when the pressure at the air bleed port exceeds a preset pressure. The effective flow area of the air bleed port is: S = nL a L b The opening load of the one-way valve is: Q = KSδρg. According to the present invention, the valve can be opened in flight and closed on the ground, ensuring the effectiveness and stability of the one-way valve and improving the safety and reliability of the entire aircraft environmental control system.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft environmental control systems, and in particular to a ram air conversion valve for an aircraft environmental control system and the aircraft environmental control system. Background Art

[0002] The ram air conversion valve (PLCKV) in the aircraft environmental control system is installed together with the adapted air cycle machine to form the fan intake and exhaust channels. Its working principle is as follows Figure 1 As shown. When the aircraft is in ground operation, the ram air suction function is mainly achieved by the rotation of the fan. The air enters the PLCKV from the ram air inlet, passes through the fan impeller, guide vanes, and the inner tube of the PLCKV to be discharged at the ram air outlet. When the aircraft takes off, the ram air will enter the PLCKV from the ram air inlet due to the relative movement of the aircraft itself. The state of the ram air flow will be affected by the movement of the aircraft and the external environment. If all the ram air entering at this time passes through the fan impeller, it will inevitably cause many uncontrollable adverse effects on the operation of the fan, and thus affect the entire aircraft environmental control system. Therefore, in order to solve the above technical problems, the present invention proposes a one-way valve device that can provide a bypass function for the ram air flow.

[0003] Because the ram air transfer valve in the aircraft environmental control system in the prior art has technical problems such as being unable to simultaneously ensure that the valve can be opened in flight and closed on the ground, and being unable to ensure its operational stability, the present invention studies and designs a ram air transfer valve for an aircraft environmental control system and an aircraft environmental control system. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the ram air transfer valve in the aircraft environmental control system in the prior art, namely, the inability to simultaneously ensure that the valve can be opened in flight and closed in ground conditions, and the inability to ensure the stability of its operation, thereby providing a ram air transfer valve for an aircraft environmental control system and an aircraft environmental control system.

[0005] In order to solve the above problems, the present invention provides a ram air transfer valve for an aircraft environmental control system, comprising:

[0006] An outer shell and an inner tube, wherein the inner tube is disposed in the outer shell, the outer shell having a ram air inlet pipe through which ram air can enter the outer shell, an air inlet being disposed on the inner tube at a position opposite to the ram air inlet pipe, the air inlet being provided with a one-way valve capable of opening the air inlet when the pressure at the air inlet exceeds a preset pressure; and

[0007] The effective flow area of the air bleed port is:

[0008] S=nL a L b (1);

[0009] Where,

[0010] n——Empirical coefficient of effective flow area size, which is a constant;

[0011] La: The inlet end of the ram air inlet pipe is rectangular, and La is the width of the rectangle, in m;

[0012] Lb—The inlet end of the ram air inlet pipe is rectangular, and Lb is the length of the rectangle, in meters;

[0013] The opening load of the one-way valve:

[0014] Q=KSδρg (2);

[0015] Where,

[0016] K——opening load experience coefficient;

[0017] ρ——Material density of one-way valve plate, kg / m 3 ;

[0018] δ——thickness of one-way valve plate, m;

[0019] g——acceleration due to gravity, m / s 2 .

[0020] In some embodiments,

[0021] In formula (1), n is 0.2 to 0.25, and in formula (2), K is 0.15 to 0.25.

[0022] In some embodiments,

[0023] The flow cross-sectional area of the air inlet is 200-250 cm 2 .

[0024] In some embodiments,

[0025] The weight of the valve plate of the one-way valve is 50-60 g, and the opening load is 2±0.5 g×the weight of the valve plate of the one-way valve.

[0026] In some embodiments,

[0027] The one-way valve is arranged on a side of the air bleed port located inside the inner tube. The gas entering the outer shell from the ram air inlet pipe impacts the one-way valve at the air bleed port from the outside of the inner tube. The one-way valve can move toward the inside of the inner tube to open the air bleed port after the pressure at the air bleed port exceeds a preset pressure.

[0028] In some embodiments,

[0029] The one-way valve can open the air inlet by rotating toward the inner side of the inner tube after the pressure at the air inlet is greater than a preset pressure.

[0030] In some embodiments,

[0031] An elastic reset structure is further provided between the one-way valve and the inner tube, and the elastic reset structure generates an elastic force on the one-way valve to move toward the air inlet and reset it.

[0032] In some embodiments,

[0033] The first end of the one-way valve is connected to the inner wall of the inner tube, and the second end can rotate around the first end. The first end of the one-way valve is connected to the inner wall of the inner tube through a rotating shaft. The elastic reset structure is a torsion spring structure, which is sleeved on the rotating shaft and acts on the first end of the one-way valve.

[0034] In some embodiments,

[0035] The one-way valve is an arc-shaped plate structure. When the one-way valve closes the air inlet, the convex arc surface of the arc-shaped plate structure protrudes toward the air inlet, and the concave arc surface of the arc-shaped plate structure is a side away from the air inlet.

[0036] In some embodiments,

[0037] The inner tube has a central axis, which is not parallel to the central axis of the ram air inlet pipe. One axial end of the inner tube is an inner tube inlet, and the other axial end is an inner tube outlet. An impeller is provided at the inner tube inlet and / or the inner tube outlet to drive the air flow in the outer shell to enter the inner tube through the inner tube inlet and then be discharged through the inner tube outlet. The air inlet is provided on the side wall of the inner tube and is opposite to the ram air inlet pipe.

[0038] The present invention further provides an aircraft environmental control system, which includes the aforementioned ram air conversion valve for the aircraft environmental control system.

[0039] The ram air conversion valve for an aircraft environmental control system and the aircraft environmental control system provided by the present invention have the following beneficial effects:

[0040] The ram air conversion valve for the aircraft environmental control system of the present invention establishes S=nL between the flow area of the bleed air port and the ram air inlet pipe. a L b The invention relates the one-way valve to the ram air inlet pipe, and establishes a relationship between the opening load of the one-way valve and the effective flow area as Q = KSδρg. This provides a design and calculation method for the effective flow area and opening load of the one-way valve, and enables the flow area of the bleed air port to vary with the size of the flow area of the ram air inlet pipe. In addition, the opening load of the one-way valve varies with the flow area of the bleed air port and the material properties of the one-way valve. This allows the designed one-way valve device to effectively ensure that it is closed when the aircraft is in ground conditions and open when in flight, that is, the valve can be opened in flight and closed on the ground, thereby ensuring the effectiveness and stability of the one-way valve. The opening and closing of the one-way valve controlled by the pressure difference can ensure that the aircraft can be used normally under both ground conditions and flight conditions, effectively solving the adverse effects of unstable ram air inflow on fan operation, and improving the safety and reliability of the operation of the entire aircraft environmental control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a side view of the internal structure of the ram air conversion valve for an aircraft environmental control system according to the present invention when the one-way valve is closed;

[0042] Figure 2 This is a side view of the internal structure of the ram air conversion valve for an aircraft environmental control system according to the present invention when the one-way valve is open;

[0043] Figure 3 1 is a top view of the structure of the ram air transfer valve for an aircraft environmental control system according to the present invention;

[0044] Figure 4 This is a structural diagram of a one-way valve in a ram air transfer valve for an aircraft environmental control system according to the present invention;

[0045] Figure 5 yes Figure 1 The right view of the internal structure;

[0046] Figure 6 yes Figure 5 A partial enlarged view of part A.

[0047] The accompanying drawings are:

[0048] 1. Outer casing; 2. Inner tube; 3. Ram air inlet tube; 4. Air bleed port; 5. One-way valve; 6. Inner tube inlet; 7. Inner tube outlet; 8. Impeller; 9. Air cycle machine; 10. Guide vane; 11. Ram air conversion valve. DETAILED DESCRIPTION

[0049] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0052] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0055] like Figure 1-6 As shown, the present invention provides 1. A ram air transfer valve for an aircraft environmental control system, characterized in that it includes:

[0056] An outer shell 1 and an inner tube 2, wherein the inner tube 2 is disposed in the outer shell 1. The outer shell 1 has a ram air inlet pipe 3, through which ram air can enter the outer shell 1. An air inlet 4 is disposed on the inner tube 2 at a position opposite the ram air inlet pipe 3. The air inlet 4 is provided with a one-way valve 5 (e.g., a valve). The one-way valve 5 can open the air inlet 4 when the pressure at the air inlet 4 exceeds a preset pressure. The following features are also provided:

[0057] The effective flow area of the air inlet 4 is:

[0058] S=nL a L b (1);

[0059] Where,

[0060] n——Empirical coefficient of effective flow area size, which is a constant;

[0061] La: The inlet end of the ram air inlet pipe 3 is rectangular, and La is the width of the rectangle, in m;

[0062] Lb—the inlet end of the ram air inlet pipe 3 is rectangular, and Lb is the length of the rectangle, in meters;

[0063] The opening load of the one-way valve 5 is:

[0064] Q=KSδρg (2);

[0065] Where,

[0066] K——opening load experience coefficient;

[0067] ρ——Material density of one-way valve plate, kg / m 3 ;

[0068] δ——thickness of one-way valve plate, m;

[0069] g——acceleration due to gravity, m / s 2 .

[0070] The ram air conversion valve for the aircraft environmental control system of the present invention establishes S=nL between the flow area of the bleed air port and the ram air inlet pipe. a L b The invention relates the one-way valve to the ram air inlet pipe, and establishes a relationship between the opening load of the one-way valve and the effective flow area as Q = KSδρg. This provides a design and calculation method for the effective flow area and opening load of the one-way valve, and enables the flow area of the bleed air port to vary with the size of the flow area of the ram air inlet pipe. In addition, the opening load of the one-way valve varies with the flow area of the bleed air port and the material properties of the one-way valve. This allows the designed one-way valve device to effectively ensure that it is closed when the aircraft is in ground conditions and open when in flight, that is, the valve can be opened in flight and closed on the ground, thereby ensuring the effectiveness and stability of the one-way valve. The opening and closing of the one-way valve controlled by the pressure difference can ensure that the aircraft can be used normally under both ground conditions and flight conditions, effectively solving the adverse effects of unstable ram air inflow on fan operation, and improving the safety and reliability of the operation of the entire aircraft environmental control system.

[0071] The present invention provides a one-way valve device for an aircraft environmental control system, belonging to the field of aircraft environmental control technology. The safety and reliability of the aircraft environmental control system operation are ensured by opening and closing the one-way valve device. When the aircraft is in ground working condition, the one-way valve plate needs to be closed to ensure the flow requirement of the PLCKV exhaust channel; when the aircraft takes off, if all the ram air entering from the outside flows through the fan, it is bound to cause many uncontrollable adverse effects on the operation of the fan. Therefore, a one-way valve device is designed that can provide a bypass function for the ram air flow, play a role in drainage, and eliminate the adverse effects of the ram air on the fan and even the entire environmental control system.

[0072] The device of the present invention is installed on the inner tube of the PLCKV for use. The inner tube of the PLCKV is a cylindrical structure that connects the fan outlet and the ram air outlet to form an air flow channel. A hole with a flow area of S is taken at the position of the inner tube of the PLCKV facing the ram air inlet. The one-way valve plate is installed on the inner side of the inner tube of the PLCKV through a torsion spring and a hinge. It can be opened inward. The material of the one-way valve plate is preferably aluminum alloy plate 6061-T6. Its structure is as follows Figure 4 shown.

[0073] like Figure 3 Shown is a top view of the ram air conversion valve, L b is the PLCKV entrance width, L a is the PLCKV entrance length (i.e. Figure 1 The PLCKV is connected to a two-stage heat exchanger. Ram air passes through the heat exchanger and then enters the PLCKV through the PLCKV inlet. When the aircraft is in flight, the check valve plate is opened by the incoming ram air, ensuring that the ram air can be discharged through the check valve channel. Therefore, it is necessary to design a reasonable check valve flow area and opening load to ensure that the check valve can open normally when the aircraft is in flight.

[0074] a) Effective flow area of one-way valve:

[0075] S=nL a L b (1)

[0076] Where,

[0077] n——Empirical coefficient of effective flow area size, taken as 0.2~0.25;

[0078] L a ——PLCKV entrance width, m;

[0079] L b ——PLCKV entrance length, m.

[0080] b) Opening load of one-way valve:

[0081] Q=KSδρg (2)

[0082] Where,

[0083] K - opening load empirical coefficient, take 0.15~0.25;

[0084] ρ——Material density of one-way valve plate, kg / m 3 ;

[0085] δ——thickness of one-way valve plate, m;

[0086] g——acceleration due to gravity, m / s 2 .

[0087] The present invention calculates the effective flow area to determine the size and center of gravity of the one-way valve plate. Then, the spring torque value when the one-way valve is opened is calculated based on the opening load and the center of gravity, so as to design a torsion spring that meets the requirements. The structural diagram is shown in FIG. Figure 1 shown.

[0088] In some embodiments,

[0089] In formula (1), n is 0.2 to 0.25, and in formula (2), K is 0.15 to 0.25.

[0090] This is the preferred range of coefficients n and K in formulas (1) and (2) of the present invention, respectively, which can further effectively ensure that the valve can be opened in the flight state and closed in the ground state, thereby ensuring the effectiveness and stability of the use of the one-way valve.

[0091] The one-way valve device designed in this invention ensures that it is closed when the aircraft is operating on the ground and open during flight. By controlling the opening and closing of the one-way valve through pressure differential control, it ensures normal operation of the aircraft during ground operation and effectively mitigates the adverse effects of unstable ram air flow on fan operation during flight, thereby improving the safety and reliability of the entire aircraft's environmental control system.

[0092] In some embodiments,

[0093] The flow cross-sectional area of the air inlet 4 is 200-250 cm 2 .

[0094] This is also the preferred range of the air bleed port flow area of the present invention, which can further effectively ensure that the valve can be opened in flight and closed on the ground, thereby ensuring the effectiveness and stability of the use of the one-way valve.

[0095] In some embodiments,

[0096] The weight of the valve plate of the one-way valve 5 is 50-60 g, and the opening load is 2±0.5 g×the weight of the one-way valve valve plate.

[0097] This is also the preferred range of the weight and opening load of the one-way valve of the present invention, which can further effectively ensure that the valve can be opened in the flight state and closed in the ground state, thereby ensuring the effectiveness and stability of the use of the one-way valve.

[0098] In some embodiments,

[0099] The one-way valve 5 is arranged on a side of the air inlet 4 located inside the inner tube 2. The gas entering the outer shell 1 from the ram air inlet pipe 3 hits the one-way valve 5 at the air inlet 4 from the outside of the inner tube, and the one-way valve 5 can move toward the inside of the inner tube 2 to open the air inlet 4 after the pressure at the air inlet 4 is greater than a preset pressure.

[0100] This is the preferred location for the one-way valve of the present invention, i.e., it is located on the inner side of the inner tube, so that the gas outside the inner tube, i.e., the gas flowing in from the ram air inlet pipe, can open the one-way valve when the pressure is high enough, effectively ensuring that the valve can be opened in flight and closed on the ground, thereby ensuring the effectiveness and stability of the one-way valve.

[0101] In some embodiments,

[0102] The one-way valve 5 can open the air inlet 4 by rotating toward the inner side of the inner tube 2 after the pressure at the air inlet 4 is greater than a preset pressure.

[0103] This is a further preferred structural form of the one-way valve of the present invention, that is, the air bleed port is opened by rotating, ensuring that the valve can be opened in flight and closed on the ground, thereby ensuring the effectiveness and stability of the one-way valve.

[0104] In some embodiments,

[0105] An elastic reset structure 12 is further provided between the one-way valve 5 and the inner tube 2 , and the elastic reset structure 12 generates an elastic force on the one-way valve 5 to move toward the air inlet 4 and reset it.

[0106] This is the preferred structural form of the ram air conversion valve of the aircraft environmental control system of the present invention. By setting up an elastic reset structure, a certain elastic force can be applied to the one-way valve, so that the bleed port can only be opened when the ram air pressure is greater than the elastic force (overcoming the resistance of the elastic force) in the flight state. When the ram air pressure is less than the elastic force in the ground state, the elastic restoring force enables the one-way valve to effectively close the bleed port. This ensures that the valve can be opened in the flight state and closed in the ground state, thereby ensuring the effectiveness and stability of the one-way valve.

[0107] In some embodiments,

[0108] The first end of the one-way valve 5 is connected to the inner wall of the inner tube 2, and the second end can rotate around the first end. The first end of the one-way valve 5 is connected to the inner wall of the inner tube 2 through a rotating shaft. The elastic reset structure 12 is a torsion spring structure, which is sleeved on the rotating shaft and acts on the first end of the one-way valve.

[0109] This is a further preferred structural form of the one-way valve of the present invention, that is, the first end is connected to the inner wall of the inner tube to form a rotating connection, and the second end can rotate around the first end, thereby achieving a rotation effect, and then achieving the effect of the one-way valve rotating to open and close the air inlet; and the elastic reset structure is preferably a torsion spring structure, which can provide elastic resistance to the one-way valve when the one-way valve opens the air inlet. The pressure of the ram gas needs to overcome the elastic force to open the air inlet, and when the pressure of the ram gas is less than the elastic force (that is, when it is in the ground state), the torsional restoring force is provided by the torsion spring structure arranged on the rotating shaft, so as to effectively drive the one-way valve to rotate to the position of closing the air inlet; effectively ensuring that the valve can be opened in the flight state and the valve can be closed in the ground state, thereby ensuring the effectiveness and stability of the use of the one-way valve.

[0110] In some embodiments,

[0111] The one-way valve 5 is an arc-shaped plate structure. When the one-way valve 5 closes the air inlet 4, the convex arc surface of the arc-shaped plate structure protrudes toward the air inlet 4, and the concave arc surface of the arc-shaped plate structure is a side away from the air inlet 4.

[0112] This is a further preferred structural form of the one-way valve of the present invention, that is, it is set as an arc-shaped plate structure. When the air inlet is closed, the convex arc surface of the arc-shaped plate protrudes toward the air inlet, which can further enhance the contact area with the air inlet and improve the sealing effect of the air inlet.

[0113] In some embodiments,

[0114] The inner tube 2 has a central axis, which is not parallel to the central axis of the ram air inlet pipe 3. One axial end of the inner tube 2 is an inner tube inlet 6, and the other axial end is an inner tube outlet 7. An impeller 8 is provided at the inner tube inlet 6 and / or the inner tube outlet 7 to drive the air flow in the outer shell 1 to enter the inner tube 2 through the inner tube inlet 6 and then be discharged through the inner tube outlet 7. The air inlet 4 is provided on the side wall of the inner tube 2 and opposite to the ram air inlet pipe 3.

[0115] This is the preferred arrangement of the inner tube and the ram air inlet tube of the present invention, i.e., the inner tube and the ram air inlet tube are arranged non-parallel, and preferably, their center lines are perpendicular to each other. An air bleed port can be provided on the side of the inner tube so as to be opposite to the incoming flow direction of the ram air inlet tube, so that when the ram air is large enough (for example, in flight), the air bleed port can be opened by overcoming the resistance of the one-way valve and the elastic return structure. The air bleed port is arranged closer to the ram air inlet tube than the inner tube inlet, thereby ensuring that the air bleed port can be opened by the one-way valve, especially in flight, so that a large flow of gas can flow out through the air bleed port and the inner tube inlet at the same time, preventing the blockage of gas flow and the resulting local excessive pressure, thereby ensuring the normal flight of the aircraft.

[0116] In this invention, when the aircraft is in flight, the incoming ram air pressure is sufficient to open the one-way valve. Most of the ram air entering the PLCKV passes directly through the one-way valve into the PLCKV's inner tube and is discharged through the ram air outlet. A portion of the ram air entering the PLCKV is drawn into the fan duct by the rotation of the fan, passing through the guide vanes and the PLCKV's inner tube to be discharged through the ram air outlet. The bypass function achieved by the one-way valve ensures that after takeoff, most of the ram air entering the PLCKV does not pass through the fan, eliminating the adverse effects of changes in the incoming ram air flow.

[0117] The present invention also provides an aircraft environmental control system, including the aforementioned ram air diversion valve 11 for use in an aircraft environmental control system. The present invention provides a one-way valve device capable of providing a bypass function for incoming ram air flow, and provides a design and calculation method for the effective flow area and opening load of the one-way valve. This ensures that the valve can be opened in flight and closed on the ground, effectively ensuring the effectiveness and stability of the one-way valve.

[0118] When the aircraft is on the ground, the PLCKV collects air for the fan and provides an exhaust channel. The suction function generated by the rotation of the fan draws in the outside air. At this time, since there is no downward pressure on the one-way valve plate, the one-way valve will not be opened and will remain in a closed state. The airflow direction is as follows: Figure 1 As shown, air is sucked into the ram air inlet, flows through the fan, the PLCKV inner tube, and finally discharged from the ram air outlet.

[0119] In this invention, after the aircraft takes off, the pressure of the ram air entering from the outside is sufficient to open the one-way valve on the inner tube of the PLCKV. At this time, most of the ram air entering from the ram air inlet will enter the inner tube of the PLCKV through the one-way valve and then be discharged from the ram air outlet; the remaining ram air will be sucked in by the suction function generated by the rotation of the fan, and the air will flow through the fan and the inner tube of the PLCKV, and finally merge with the air entering directly from the one-way valve and be discharged from the ram air outlet. The airflow direction is as follows: Figure 2 shown.

[0120] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A ram air transfer valve for an aircraft environmental control system, characterized by: include: An outer shell (1) and an inner tube (2), wherein the inner tube (2) is arranged in the outer shell (1), the outer shell (1) has a ram air inlet tube (3), and ram air can enter the outer shell (1) from the ram air inlet tube (3), an air inlet (4) is provided on the inner tube (2) at a position opposite to the ram air inlet tube (3), and a one-way valve (5) is provided at the air inlet (4), and the one-way valve (5) can open the air inlet (4) after the pressure at the air inlet (4) exceeds a preset pressure; and The effective flow area of the air inlet (4) is: S=nL a L b (1); Where, n——Empirical coefficient of effective flow area size, which is a constant; La——the inlet end of the ram air inlet pipe (3) is rectangular, and La is the width of the rectangle, in m; Lb——the inlet end of the ram air inlet pipe (3) is rectangular, Lb is the length of the rectangle, m; The opening load of the one-way valve (5): Q=KSδρg (2); Where, K——opening load experience coefficient; ρ——Material density of one-way valve plate, kg / m 3 ; δ——thickness of one-way valve plate, m; g——acceleration due to gravity, m / s 2 ; The one-way valve (5) can open the air inlet (4) after the pressure at the air inlet (4) is greater than a preset pressure, so that the flow area of the air inlet changes with the size of the flow area of the ram air inlet pipe, and the opening load of the one-way valve changes with the flow area of the air inlet and the material properties of the one-way valve.

2. The ram air transfer valve for an aircraft environmental control system according to claim 1, characterized in that: In formula (1), n is 0.2 to 0.25, and in formula (2), K is 0.15 to 0.

25.

3. The ram air transfer valve for an aircraft environmental control system according to claim 1, wherein: The flow cross-sectional area of the air inlet (4) is 200-250 cm 2 .

4. The ram air transfer valve for an aircraft environmental control system according to claim 1, wherein: The weight of the valve plate of the one-way valve (5) is 50-60 g, and the opening load is 2±0.5 g×the weight of the one-way valve plate.

5. The ram air transfer valve for an aircraft environmental control system according to claim 1, wherein: The one-way valve (5) is arranged on a side of the air inlet (4) located inside the inner tube (2); the gas entering the outer shell (1) from the ram air inlet pipe (3) impacts the one-way valve (5) at the air inlet (4) from the outside of the inner tube; and the one-way valve (5) can move toward the inside of the inner tube (2) and open the air inlet (4) after the pressure at the air inlet (4) exceeds a preset pressure.

6. The ram air transfer valve for an aircraft environmental control system according to claim 5, characterized in that: The one-way valve (5) can open the air inlet (4) by rotating toward the inner side of the inner tube (2) after the pressure at the air inlet (4) exceeds a preset pressure.

7. The ram air transfer valve for an aircraft environmental control system according to claim 1, wherein: An elastic reset structure (12) is also provided between the one-way valve (5) and the inner tube (2), and the elastic reset structure (12) generates an elastic force on the one-way valve (5) to move toward the air inlet (4) and reset it.

8. The ram air transfer valve for an aircraft environmental control system according to claim 7, wherein: The first end of the one-way valve (5) is connected to the inner wall of the inner tube (2), and the second end can rotate around the first end. The first end of the one-way valve (5) is connected to the inner wall of the inner tube (2) through a rotating shaft. The elastic reset structure (12) is a torsion spring structure, which is sleeved on the rotating shaft and acts on the first end of the one-way valve.

9. The ram air transfer valve for an aircraft environmental control system according to any one of claims 1 to 8, characterized in that: The one-way valve (5) is an arc-shaped plate structure. When the one-way valve (5) closes the air inlet (4), the convex arc surface of the arc-shaped plate structure protrudes toward the air inlet (4), and the concave arc surface of the arc-shaped plate structure is a side surface away from the air inlet (4).

10. The ram air transfer valve for an aircraft environmental control system according to any one of claims 1 to 9, characterized in that: The inner tube (2) has a central axis, and the central axis of the inner tube (2) is not arranged parallel to the central axis of the ram air inlet pipe (3). One axial end of the inner tube (2) is an inner tube inlet (6), and the other axial end is an inner tube outlet (7). An impeller (8) is provided at the inner tube inlet (6) and / or the inner tube outlet (7) to drive the air flow in the outer shell (1) to enter the inner tube (2) through the inner tube inlet (6) and then be discharged through the inner tube outlet (7). The air inlet (4) is provided on the side wall of the inner tube (2) and is opposite to the ram air inlet pipe (3).

11. An aircraft environmental control system, characterized by: A ram air conversion valve (11) for an aircraft environmental control system comprising the ram air conversion valve (11) according to any one of claims 1 to 10.

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