An ejector valve, an ejector and a variable cycle engine

Abstract

The application discloses an ejector valve, an ejector and a variable cycle engine, and relates to the technical field of aero-engines, aiming to solve the problems of complex structure, heavy weight, low precision and poor synchronism of the existing ejector valve. The ejector valve comprises a linear driving assembly and a valve, the linear driving assembly comprises a step motor lead screw and a mounting piece, the step motor lead screw is threadedly connected with the mounting piece, the valve is arranged on the mounting piece, the step motor lead screw has two opposite rotation directions, and the step motor lead screw is used for driving the mounting piece to drive the valve to move along the extension direction of the step motor lead screw. The ejector valve, the fore-duct ejector and the variable cycle engine are used for realizing the flow regulation between the core engine and the fan and the high-pressure compressor with a simplified structure, a lighter weight, a higher control precision and a better synchronism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engines, and particularly relates to an ejector valve, an ejector and a variable cycle engine. BACKGROUND

[0002] The variable cycle engine changes its thermodynamic cycle by changing the geometry, size or position of some components of the engine, so as to achieve optimal overall performance in various working states. The front variable area bypass inject (FVABI) is one of the variable geometry components of the variable cycle engine, and is used for controlling the flow of compressed air into the core engine, so as to adapt to the stable and efficient working requirements of the compression component. The FVABI is located at the inlet of the outer bypass channel between the core driven fan stage (CDFS) and the high pressure compressor (HPC), and is a valve for changing the air flow of the core engine. The valve can regulate the flow between the CDFS and the HPC, so as to control the stall margin of the CDFS.

[0003] At present, the valve can adopt an actuating mechanism with a control arm, the valve adopts a cylindrical structure, and hydraulic operating cylinders are uniformly arranged along the circumference. The control arm is driven by the extension and retraction arms of the hydraulic operating cylinders, the control arm pulls the cylinder to perform axial extension and retraction movement, so as to realize the opening and closing of the passage. However, the device has the problems of complex structure, large weight, low precision and poor synchronism. SUMMARY

[0004] The present application aims to provide an ejector valve, an ejector and a variable cycle engine, which have simple structure, light weight, high control precision and good synchronism.

[0005] In order to achieve the above-mentioned purpose, the present application provides an ejector valve, which comprises:

[0006] A linear drive assembly and a valve, the linear drive assembly comprises a step motor lead screw and a mounting piece, the step motor lead screw is threadedly connected with the mounting piece, the valve is arranged on the mounting piece, the step motor lead screw comprises a step motor and a lead screw, the ejector valve further comprises a casing and a bracket mounted on the casing, the step motor is connected to a corresponding mounting hole of the bracket, one end of the lead screw is connected to the bracket through a bearing, and the other end of the lead screw is connected to the casing through a bearing; the step motor lead screw has two opposite rotation directions, and is used for driving the mounting piece to drive the valve to move along the extension direction of the step motor lead screw.

[0007] Compared with the prior art, the ejector valve provided by the application has the following advantages: the linear driving assembly comprises a step motor and a mounting member, the step motor is in threaded connection with the mounting member, and the valve is arranged on the mounting member, so that the step motor can drive the mounting member to move along the extension direction of the step motor by changing the rotation direction of the step motor.

[0008] In addition, the step motor comprises a step motor and a screw rod, the ejector valve further comprises a housing and a support arranged on the housing, the step motor is connected to the corresponding mounting hole of the support, one end of the screw rod is connected to the support through a bearing, and the other end of the screw rod is connected to the housing through a bearing. On this basis, the movement direction of the valve can be adjusted according to actual needs, so as to control the air flow passing through the core engine driving fan into the high-pressure compressor. When it is needed to increase the flight speed, the step motor can be used to drive the mounting member to move the valve away from the step motor, so as to increase the air flow passing through the core engine driving fan into the high-pressure compressor. When it is needed to reduce the fuel consumption, the step motor can be used to drive the mounting member to move the valve close to the step motor, so as to reduce the air flow passing through the core engine driving fan into the high-pressure compressor.

[0009] It can be seen that the ejector valve provided by the application can control the rotation direction and rotation speed of the step motor through an electric signal, so as to control the movement direction and movement speed of the valve and realize the flow regulation between the core engine driving fan and the high-pressure compressor. Meanwhile, compared with the hydraulic actuating mechanism, the ejector valve provided by the application has higher control precision and better synchronization because the electric signal has higher sensitivity and faster signal transmission speed.

[0010] In addition, compared with the hydraulic actuating mechanism, the ejector valve provided by the application can convert the rotation movement of the step motor into the linear movement of the mounting member and the valve through the threaded connection between the screw rod and the mounting member. The structure is simple and light in weight, and does not need to be provided with a control arm assembly and liquid inlet and outlet pipelines.

[0011] The embodiment of the application further provides an ejector comprising the ejector valve described above.

[0012] Compared with the prior art, the ejector provided by the application has the same advantages as the ejector valve, and details are not repeated here.

[0013] The embodiment of the present application also provides a variable cycle engine comprising the ejector valve.

[0014] Compared with the prior art, the variable cycle engine provided by the present application has the same beneficial effects as the ejector valve, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0016] Figure 1 Fig. 1 shows a front view of the ejector valve provided by the embodiment of the present application;

[0017] Figure 2 Fig. 2 shows a right view of the ejector valve provided by the embodiment of the present application;

[0018] Figure 3 Fig. 3 shows a top view of the ejector valve provided by the embodiment of the present application.

[0019] LIST OF REFERENCES

[0020] 100 - ejector valve; 101 - linear drive assembly; 1011 - step motor; 10111 - step motor; 10112 - screw rod; 1012 - mounting; 102 - valve; 103 - first axial through hole; 104 - radial through hole; 105 - connecting piece; 106 - guide rod; 107 - second axial guide hole; 108 - machine case; 109 - bracket; 110 - bearing. DETAILED DESCRIPTION

[0021] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

[0022] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0023] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of the technical features directed. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. The meaning of "several" is one or more, unless otherwise explicitly and specifically limited.

[0024] The variable cycle engine changes its thermodynamic cycle by changing the geometry, size or position of some components of the engine to achieve optimal overall performance in various operating states. The front bypass ejector (FVABI) is one of the variable geometry components of the variable cycle engine, which is used to control the flow of compressed air into the core engine to meet the stable and efficient working requirements of the compression component. It is located at the inlet of the outer bypass of the core engine driven fan (CDFS) and high pressure compressor (HPC), and is a valve for changing the air flow of the core engine. The valve can control the flow between the CDFS and the HPC, thereby controlling the stall margin of the CDFS.

[0025] At present, the valve can adopt a linear actuator with a control arm, and the valve adopts a cylindrical structure, and hydraulic actuating cylinders are uniformly arranged along the circumference. The cylindrical structure is pulled to perform axial extension and contraction movement by the extension and contraction arms of the hydraulic actuating cylinders, so as to realize the opening and closing of the passage. However, the device has the problems of complex structure, large weight, low precision and poor synchronism.

[0026] In view of the above problems, the embodiment of the present application further provides a variable cycle engine, which comprises an ejector valve. The ejector valve can control the flow between the core engine driven fan and the high pressure compressor, thereby achieving optimal overall performance in various operating states.

[0027] The embodiment of the present application further provides an ejector which can be applied to the above-mentioned variable cycle engine. The ejector can be a front bypass ejector, and comprises an ejector valve. The ejector valve can adjust the bypass outlet area of the core engine driven fan under high control precision and good synchronism, so as to adjust the inner and outer bypass flow distribution of the engine.

[0028] Figure 1 A front view of the ejector valve provided by the embodiment of the present application is shown. As shown in Figure 1 The ejector valve 100 comprises a linear drive assembly 101 and a valve 102.

[0029] The linear driving assembly 101 comprises a step motor screw 1011 and a mounting member 1012, the step motor screw 1011 is threadedly connected with the mounting member 1012, and a valve 102 is arranged on the mounting member 1012, the step motor screw 1011 is used to drive the mounting member 1012 to drive the valve 102 to move along the extension direction of the step motor screw 1011. The step motor screw 1011 can have two opposite rotation directions, which can include clockwise direction and counterclockwise direction.

[0030] The ejector valve 100 further comprises a housing 108 and a bracket 109 mounted on the housing 108, the step motor screw 1011 is connected with the bracket 109 through a bearing 110, and a trapezoidal thread screw is used. At this time, the step motor screw can comprise a step motor 10111 and a screw 10112, wherein the step motor 10111 is connected to the corresponding mounting hole of the bracket 109, one end of the screw 10112 is connected to the bracket 109 through a bearing 110, and the other end of the screw 10112 is connected to the housing 108 through a bearing 110.

[0031] For example, the housing in the embodiment of the present application plays the role of a mounting base, and the bracket is mounted on the housing by using a flange. The two ends of the guide rod are in sliding connection with the housing and the bracket, and when the guide rod is in the structure of a long bolt, the housing and the bracket are respectively provided with internal threads matched with the threads. The step motor screw is connected with the bracket through a bearing, which is a small deep groove ball bearing with a single dustproof structure, used to support the electric screw and transmit the radial load and axial load of the linear driving assembly.

[0032] Since the rotation speed of the step motor is proportional to the pulse frequency, the rotation speed of the screw can be controlled by adjusting the pulse frequency of the motor, thereby further improving the control accuracy and synchronization of the ejector valve. In actual application, a step motor heat shield can be arranged according to the working environment to reduce the probability of heat damage of the motor.

[0033] The step motor screw 1011 in the exemplary embodiment of the present application can be a step motor screw. At this time, the step motor screw can comprise a step motor 10111 and a screw 10112.

[0034] For example, when the step motor screw rotates in the counterclockwise direction, the step motor screw can drive the valve to move in the direction close to the step motor, thereby increasing the air flow rate through the core engine driving fan into the high-pressure compressor. When the step motor screw rotates in the clockwise direction, the step motor screw can drive the valve to move in the direction away from the step motor, thereby reducing the air flow rate through the core engine driving fan into the high-pressure compressor. For example:

[0035] The valve can be made of a resin-based composite material with temperature resistance, and the resin-based composite material has the characteristics of low density, for example, the resin-based composite material can include polyimide resin-based composite material and carbon fiber resin-based composite material.

[0036] When the valve material has temperature resistance and low density, the overall weight of the valve is reduced, so the driving force required by the stepping motor is reduced, and the load of the motor is also reduced.

[0037] In particular, since the linear drive assembly includes a stepping motor and a mounting member, the stepping motor is threadedly connected with the mounting member, so that the mounting member can be driven to move along the extension direction of the stepping motor by the threads on the surface of the stepping motor during rotation. Since the valve is arranged on the mounting member and the stepping motor has two opposite rotation directions, the stepping motor can drive the mounting member to drive the valve to reciprocate along the extension direction of the stepping motor by changing the rotation direction.

[0038] Suppose that when the stepping motor rotates in the counterclockwise direction, the stepping motor can drive the valve to open, so that the counterclockwise rotation of the stepping motor can be controlled by an electrical signal, thereby increasing the air flow through the core engine drive fan into the high-pressure compressor.

[0039] Suppose that when the stepping motor rotates in the clockwise direction, the stepping motor can drive the valve to close, so that the clockwise rotation of the stepping motor can be controlled by an electrical signal, thereby reducing the air flow through the core engine drive fan into the high-pressure compressor.

[0040] Meanwhile, the opening / closing speed of the valve can also be controlled by adjusting the rotation speed of the stepping motor according to actual needs.

[0041] It can be seen that the ejector valve provided by the present application can control the movement direction and speed of the valve through an electrical signal, thereby realizing the flow regulation between the core engine drive fan and the high-pressure compressor. Since the electrical signal has high sensitivity and fast signal transmission speed, compared with the hydraulic actuating mechanism, the movement state of which is different due to the gap between the oil pressure and the mechanical parts, the ejector valve provided by the present application has higher control accuracy and better synchronization.

[0042] In addition, compared with the hydraulic actuating mechanism, the ejector valve provided by the present application can convert the rotary motion of the stepping motor into linear motion of the mounting member and the valve through the thread cooperation between the screw rod and the mounting member. This structure is simple and light in weight, and does not need to set up a control arm assembly and liquid inlet and outlet pipelines and other structures.

[0043] In an alternative, the valve in the embodiment of the present application is a cylindrical valve, which can be driven by the step motor to move linearly, so as to adjust the area of the channel of the bypass airflow.

[0044] In practical application, a plurality of linear driving assemblies can be arranged according to the load, and the plurality of linear driving assemblies are evenly distributed along the circumferential direction of the valve. In addition, the rotation direction and rotation speed of the step motor are controlled by the electrical signal at the same time, so as to reduce the failure of the valve caused by poor synchronization of the driving assemblies.

[0045] For example, when the valve is a cylindrical valve, the side wall profile of the valve can be a circular profile, a polygonal profile or an irregular profile. Here, the circular profile can include a circular profile or an elliptical profile.

[0046] For example, when the side wall profile of the valve is a circular profile, the mounting surface can be a sector and a rectangle. In order to make the valve stable, the mounting surface can be a rectangle when the side wall profile of the valve is a polygonal profile.

[0047] In an alternative, Figure 2 A right view of the ejector valve provided by the embodiment of the present application is shown. As shown in Figure 1 and Figure 2 The mounting member 1012 in the embodiment of the present application has a first axial through hole 103103, and the step motor 1011 can be threadedly connected with the mounting member 1012 through the first axial through hole 103.

[0048] For example, the inner wall of the first axial through hole can have a thread, which can be matched with the thread on the rod body of the step motor. At this time, when the step motor rotates, the thread in the first axial through hole cooperates with the thread on the rod body of the step motor, so that the mounting member can move linearly along the extension direction of the step motor.

[0049] For example, as shown in Figure 2 The mounting member 1012 in the embodiment of the present application can also have at least one radial through hole 104, and the corresponding ejector valve 100 can also include at least one connecting member 105. Each connecting member 105 has opposite first and second ends, the first end of the connecting member 105 is fixed in the corresponding radial through hole 104 through the valve 102, and the second end of the connecting member 105 is fixed on the valve 102.

[0050] The embodiment of the present application can enhance the fastening force between the valve and each component through the cooperation of the radial through hole and the connecting piece, so that the valve can move along the extension direction of the stepping motor lead screw during the rotation of the stepping motor lead screw, and the valve is not easy to fall off during the movement of the mounting piece.

[0051] In order to avoid the problem caused by the interference between the first axial through hole and the radial through hole, each radial through hole can be staggered with the first axial through hole. At this time, the occurrence probability of the phenomenon that the ejector valve fails due to the contact between the stepping motor lead screw and the connecting piece during work is reduced.

[0052] For example, each connecting piece has a through hole penetrating the second end along the radial direction of the connecting piece, and the ejector valve further comprises at least one locking piece, each locking piece locking the corresponding connecting piece on the valve through the through hole, so as to reduce the occurrence probability of the phenomenon that the connecting piece is loose during work. For example, the connecting piece can be a screw, and the through hole can be a locking hole. The connecting piece in the embodiment of the present application can cooperate with the locking hole to reduce the occurrence probability of the phenomenon that the connecting piece is loose during work.

[0053] In an alternative way, Figure 3 A top view of the ejector valve provided by the embodiment of the present application is shown. As shown in Figure 2 and Figure 3 As shown, the ejector valve 100 provided by the embodiment of the present application can further comprise a plurality of guide rods 106, the plurality of guide rods 106 are distributed along the circumference of the stepping motor lead screw 1011, the mounting piece 1012 has a plurality of second axial guide holes 107, each guide rod 106 is slidingly installed in the corresponding second axial guide hole 107, and each radial through hole 104 is staggered with each second axial guide hole 107. At this time, the plurality of second axial guide holes 107 are uniformly distributed on both sides of the first axial through hole 103, and the above-mentioned plurality of guide rods 106 can be arranged on the ejector valve 100 as the sliding rails of the mounting piece 1012.

[0054] In actual application, the above-mentioned second axial guide hole can be consistent with the hole depth direction of the first axial guide hole, so as to ensure that the guide rod is parallel to the stepping motor lead screw, so as to ensure that the stepping motor lead screw will not deviate when driving the mounting piece to move the valve, and the stability of the linear movement of the mounting piece is enhanced. It should be understood that in order to enhance the stability of the linear movement of the mounting piece, the number of guide rods can be increased in the ejector valve.

[0055] Since each radial through hole is staggered with each second axial guide hole, each radial through hole can also be staggered with the first axial through hole, thus the connecting piece cannot enter the second axial guide hole or the first axial through hole through the radial through hole, avoiding the problem caused by the friction between the connecting piece and the step motor lead screw or the guide rod, thereby ensuring the normal work of the ejector valve.

[0056] The guide rod can be a long bolt structure or a smooth rod body, as long as it can support the sliding of the mounting piece, and the specific structure is not limited here.

[0057] For example, as shown in Figure 2 and Figure 3 When the ejector valve 100 has a step motor lead screw 1011, two guide rods 106 and four connecting pieces 105, the step motor lead screw 1011 is matched with a corresponding first axial through hole 103, each of the two sides of the first axial through hole 103 is uniformly provided with a second axial guide hole 107, the two guide rods 106 are matched with corresponding second axial guide holes 107, and the four radial through holes 104 are staggered with the first axial through hole 103 and the two second axial guide holes 107, respectively.

[0058] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0059] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the above description, the patterning, etching and other technical details of each layer are not described in detail. However, those skilled in the art should understand that the layers, regions and the like of the required shape can be formed by various technical means. In addition, those skilled in the art can also design methods that are not exactly the same as the methods described above in order to form the same structure. In addition, although each embodiment is described above, this does not mean that the measures in each embodiment cannot be used advantageously in combination.

[0061] The embodiments of the application described above are intended to be illustrative only. The scope of the application should be defined by the appended claims and their equivalents. Various alternative and equivalent implementations can be made without departing from the scope of the application, and it is intended that such alternatives and equivalents include a full scope of the claims appended hereto and their equivalents.

Claims

1. An ejector valve, characterized in that, The ejector valve is located at the inlet of the bypass duct between the core engine drive fan and the high-pressure compressor, and is used for flow regulation between the core engine drive fan and the high-pressure compressor. The ejector valve includes a linear drive assembly and a valve. The linear drive assembly includes a stepper motor and a mounting component. The stepper motor is threadedly connected to the mounting component, and the valve is mounted on the mounting component. The stepper motor includes a stepper motor and a lead screw. The ejector valve also includes a housing and a bracket mounted on the housing. The stepper motor is connected to a corresponding mounting hole on the bracket. One end of the lead screw is bearing-connected to the bracket, and the other end is bearing-connected to the housing. The stepper motor has two opposite rotation directions, and it drives the mounting component to move the valve along the extension direction of the stepper motor. The linear drive assembly comprises multiple linear drive assemblies distributed along the circumferential direction of the valve; the mounting member has a first axial through hole, through which the stepper electric screw is threadedly connected to the mounting member; the mounting member also has at least one radial through hole, each radial through hole being offset from the first axial through hole; the ejector valve further includes at least one connector, each connector having a first end and a second end opposite to each other, the first end passing through the valve and fixed in the corresponding radial through hole, the second end being fixed to the valve; the ejector valve further includes multiple guide rods distributed along the circumferential direction of the stepper electric screw; the mounting member has multiple second axial guide holes, each guide rod being slidably mounted in the corresponding second axial guide hole, each radial through hole being offset from each second axial guide hole.

2. The ejector valve according to claim 1, characterized in that, The valve is a cylindrical valve.

3. The ejector valve according to claim 1, characterized in that, The linear drive assembly includes a mounting component having a mounting surface that contacts the sidewall of the valve, the mounting surface matching the profile of the sidewall of the valve.

4. The ejector valve according to claim 1, characterized in that, Each of the connectors has a through hole extending through the second end along the radial direction of the connector, and the ejector valve further includes at least one locking element, each of the locking elements locking the corresponding connector onto the valve through the through hole.

5. An ejector, characterized in that, The ejector includes the ejector valve as described in any one of claims 1 to 4.

6. A variable cycle engine, characterized in that, The variable cycle engine includes the ejector valve as described in any one of claims 1 to 4.

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