Pneumatic servo control type fan air valve

Abstract

The invention belongs to the field of product mechanical structure design, and discloses a pneumatic servo control type fan air valve which comprises a channel butterfly plate assembly, a pilot valve assembly, a torque motor assembly, a filter assembly, an upper die cavity assembly, a lower die cavity assembly and a pressure guide pipe. Gas introduced by a pressure guiding pipe sequentially passes through the filtering assembly and the pilot valve assembly to enter the torque motor assembly, the torque motor assembly adjusts the opening degree and exhausts the gas according to the magnitude of applied current, the gas flow subjected to opening degree adjustment enters the upper membrane cavity assembly, and a membrane type differential pressure structure is formed between the upper membrane cavity assembly and the lower membrane cavity assembly. The lower die cavity assembly controls the opening degree of the channel butterfly plate assembly according to the air pressure in the upper die cavity assembly, and the channel butterfly plate assembly is arranged on an airplane pre-cooling air path. According to the invention, the torque motor with extremely high precision and small adjustable flow is applied to the high-flow butterfly plate channel, so that stepless adjustment and high-precision adjustment of the temperature of the aircraft air source system are achieved, and the adjustment precision far exceeds the use requirement of + / -6 DEG C of a civil aircraft air source system, specifically, the adjustment precision can be within + / -1 DEG C. The valve is high in dynamic stability, rapid in response and stable and reliable in quality, and the product can meet the requirement for temperature adjustment of a civil aircraft air source system and can meet the requirement for the civil aircraft air source system.

Description

Technical Field

[0001] The invention belongs to the field of product mechanical structure design, and relates to a servo-controlled fan air valve for an aircraft engine air source system, and in particular to a pneumatic servo-controlled fan air valve. Background Art

[0002] With the development of aircraft multi-electric and all-electric technology, the aircraft air source system has gradually achieved a breakthrough in the transformation from electromechanical to electromechanical control integration, and has developed from pneumatic to digital air bleed. Most of the traditional fan air valves are pneumatic fixed flow control valves, which cannot achieve stepless temperature regulation of the air source system, and the regulation accuracy is relatively low (±10℃), which cannot meet the use requirements and airworthiness requirements of the civil aircraft air source system (±6℃), and the mechanical pneumatic pressure regulating valve is too heavy and large in size, which cannot meet the host's requirements for lightweight and small products. In order to meet the use requirements of the civil aircraft air source system, the fan air valve needs to be designed into a structure with stepless adjustment, fast response, high dynamic stability, and small size to meet the system requirements. Therefore, the pneumatic fixed-adjustment air bleed control valve has made a breakthrough in the transformation to the pneumatic servo control type. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a pneumatic servo-controlled fan air valve, which is steplessly adjustable, has high dynamic stability, fast response, small size, good processing technology, safe and reliable quality, and can meet the temperature regulation needs of civil aircraft air source systems.

[0005] The technical solution of the present invention is as follows:

[0006] A pneumatic servo-controlled fan air valve comprises a channel butterfly plate assembly, a pilot valve assembly, a torque motor assembly, a filter assembly, an upper membrane chamber assembly, a lower membrane chamber assembly and a pressure-inducing pipe. The gas connected to the pressure-inducing pipe successively passes through the filter assembly and the pilot valve assembly into the torque motor assembly. The torque motor assembly adjusts the opening and exhausts according to the magnitude of the applied current. The airflow after the opening adjustment enters the upper membrane chamber assembly. A diaphragm-type differential pressure structure is formed between the upper membrane chamber assembly and the lower membrane chamber assembly. The lower membrane chamber assembly controls the opening of the channel butterfly plate assembly according to the air pressure in the upper membrane chamber assembly. The channel butterfly plate assembly is arranged on the aircraft pre-cooling air path.

[0007] Furthermore, according to the temperature requirement fed back by the system temperature sensor, the current applied to the torque motor assembly is changed to adjust the valve opening, thereby controlling the cold side flow of the precooler connected to the channel butterfly plate assembly so that the hot side outlet temperature of the precooler meets the requirements of the aircraft air source system.

[0008] Furthermore, a mechanical indicating mechanism is provided at the bottom of the channel butterfly plate assembly, and the mechanical indicating mechanism indicates the opening degree of the disc plate in the channel butterfly plate assembly at this time.

[0009] Furthermore, the disc plate of the channel disc assembly is also connected to a manual opening and closing structure.

[0010] Furthermore, the upper diaphragm chamber assembly includes a closed position adjusting screw, an upper diaphragm chamber shell, and a diaphragm; the lower diaphragm chamber assembly includes a spring, an actuator cylinder, a guide ring, a rocker arm connecting rod assembly, and a lower diaphragm chamber shell; the upper diaphragm chamber shell and the lower diaphragm chamber shell are separated by a diaphragm, and the diaphragm is an elastic structure. The actuator cylinder is arranged in the lower diaphragm chamber shell, one end of the rocker arm connecting rod assembly is connected to the diaphragm and transmits the changes of the diaphragm, the rocker arm connecting rod assembly passes through the actuator cylinder and is fixed to the lower diaphragm chamber shell through a rocker arm structure connected by a rotating shaft, and the spring is arranged between the inside of the lower diaphragm chamber shell and the diaphragm; the guide ring is arranged on the outside of the actuator cylinder.

[0011] Furthermore, the torque motor assembly includes a torque motor and a control seat. The control seat is arranged outside the output end of the torque motor. The control seat has an internal cavity. The control seat integrates an intake nozzle, an exhaust nozzle and a downstream interface connected to the internal cavity; the front end of the intake nozzle is a pilot valve assembly, and the rear end of the downstream interface is an upper membrane cavity assembly; the torque motor main shaft of the torque motor controls the rotation of the baffle assembly, and the rotation angle of the baffle assembly adjusts the opening of the intake nozzle and the exhaust nozzle.

[0012] Furthermore, the middle part of the baffle assembly is fixedly connected to the main shaft of the torque motor, and the intake nozzle and the exhaust nozzle are arranged in the radial direction of the main shaft of the torque motor; the sealing surface of the baffle assembly cooperates with the intake nozzle and the exhaust nozzle respectively.

[0013] Furthermore, it also includes an adjusting screw and a spring. The adjusting screw is inserted into the control seat from the outside. The end of the adjusting screw contacts the baffle assembly through the spring. The initial position of the baffle assembly is adjusted by the adjusting screw.

[0014] Technical effects of the present invention:

[0015] 1. The present invention sets the expected value of the hot side outlet temperature of the precooler according to the air conditioning system and the anti-icing air intake temperature requirements, as well as the air source system. The electronic controller outputs a corresponding current to the fan air valve torque motor, and controls the opening of the torque motor intake nozzle and the exhaust nozzle according to the current of the torque motor. The opening chamber pressure changes accordingly, acting on the diaphragm assembly, prompting the rocker arm connecting rod mechanism to drive the butterfly plate to rotate. Under the action of the large spring of the closing chamber of the diaphragm chamber assembly and the opening chamber pressure, the fan air valve moves the butterfly plate to the open position to control the opening of the product butterfly plate and the valve butterfly plate opening. The fan air valve outputs the corresponding cold side flow value, which is adjusted by the precooler to achieve the purpose of accurately controlling the hot side outlet temperature of the precooler.

[0016] 2. The present invention applies a torque motor with extremely high precision but very small adjustable flow rate in a large-flow disc channel, thereby achieving stepless and high-precision regulation of the temperature of the aircraft air source system. The regulation accuracy far exceeds the ±6°C usage requirement of the civil aircraft air source system, and can specifically reach within ±1°C.

[0017] 3. The valve of the present invention has high dynamic stability, rapid response, stable and reliable quality, so that the product can meet the temperature regulation requirements of the air source system of civil aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 is a schematic structural diagram of a fan air valve of the present invention;

[0020] Figure 2 is a schematic diagram of the principle of the fan air valve of the present invention;

[0021] Figure 3 is a schematic diagram of a diaphragm assembly of the present invention;

[0022] Figure 4 is a schematic diagram of a torque motor assembly of the present invention;

[0023] Among them, 1—channel butterfly plate assembly, 2—lower membrane chamber assembly, 3—upper membrane chamber assembly, 4—pressure guide pipe, 5—filter assembly, 6—electrical connector, 7—pilot valve assembly, 8—torque motor assembly, 9—mechanical indicating mechanism;

[0024] 31—closed position adjustment screw; 32—upper membrane chamber housing; 33—diaphragm; 24—spring; 25—actuator cylinder; 26—guide ring; 27—rocker arm connecting rod assembly; 28—lower membrane chamber housing;

[0025] 81—torque motor, 82—torque motor spindle, 83—adjusting screw, 84—hexagonal nut, 85—washer, 86—stopper, 87—graphite sealing gasket, 88—sealing ring, 89—spring, 810—downstream interface, 811—intake nozzle, 812—exhaust nozzle, 813—baffle assembly, 814—tightening screw, 815—control seat. DETAILED DESCRIPTION

[0026] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the orientations or positional relationships in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0029] Embodiment 1:

[0030] A pneumatic servo-controlled fan air valve comprises a channel butterfly plate assembly 1, a pilot valve assembly 7, a torque motor assembly 8, a filter assembly 5, an upper membrane chamber assembly 3, a lower membrane chamber assembly 2 and a pressure-inducing pipe 4. The gas connected to the pressure-inducing pipe 4 successively passes through the filter assembly 5 and the pilot valve assembly 7 into the torque motor assembly 8. The torque motor assembly 8 adjusts the opening and exhaust according to the magnitude of the applied current. The airflow after the opening adjustment enters the upper membrane chamber assembly 3. A diaphragm-type differential pressure structure is formed between the upper membrane chamber assembly 3 and the lower membrane chamber assembly 2. The lower membrane chamber assembly 2 controls the opening of the channel butterfly plate assembly 1 according to the air pressure in the upper membrane chamber assembly 3. The channel butterfly plate assembly 1 is arranged on the aircraft pre-cooling air path.

[0031] According to the temperature requirement fed back by the system temperature sensor, the current applied to the torque motor assembly 8 is changed to adjust the valve opening, thereby controlling the cold side flow of the precooler connected to the channel butterfly plate assembly 1 so that the hot side outlet temperature of the precooler meets the requirements of the aircraft air source system.

[0032] A mechanical indicating mechanism 9 is also provided at the bottom of the channel butterfly plate assembly 1 , and the mechanical indicating mechanism 9 indicates the opening degree of the disc plate in the channel butterfly plate assembly 1 at this time.

[0033] The disc plate of the channel disc assembly 1 is also connected to a manual opening and closing structure.

[0034] The upper diaphragm chamber assembly 3 includes a closing position adjusting screw 31, an upper diaphragm chamber shell 32, and a diaphragm 33. The lower diaphragm chamber assembly 2 includes a spring 24, an actuator cylinder 25, a guide ring 26, a rocker arm connecting rod assembly 27 and a lower diaphragm chamber shell 28. The upper diaphragm chamber shell 32 and the lower diaphragm chamber shell 28 are separated by a diaphragm 33. The diaphragm 33 is an elastic structure. The actuator cylinder 25 is arranged in the lower diaphragm chamber shell 28. One end of the rocker arm connecting rod assembly 27 is connected to the diaphragm 33 and transmits the changes of the diaphragm 33. The rocker arm connecting rod assembly 27 passes through the actuator cylinder 25 and is fixed to the lower diaphragm chamber shell 28 through a rocker arm structure connected by a rotating shaft. The spring 24 is arranged between the inside of the lower diaphragm chamber shell 28 and the diaphragm; the guide ring 26 is arranged on the outside of the actuator cylinder 25.

[0035] The torque motor assembly 8 includes a torque motor 81 and a control seat 15. The control seat 815 is arranged outside the output end of the torque motor 81. The control seat 815 has an internal cavity. The control seat 815 integrates an intake nozzle 811, an exhaust nozzle 812 and a downstream interface 810 connected to the internal cavity; the front end of the intake nozzle 811 is a pilot valve assembly 87, and the rear end of the downstream interface 810 is an upper membrane cavity assembly 83; the torque motor main shaft 82 of the torque motor 81 controls the rotation of the baffle assembly 813, and the rotation angle of the baffle assembly 813 adjusts the opening of the intake nozzle 811 and the exhaust nozzle 812.

[0036] The middle part of the baffle assembly 813 is fixedly connected to the torque motor main shaft 82, and the intake nozzle 811 and the exhaust nozzle 812 are arranged in the radial direction of the torque motor main shaft 82; the sealing surface of the baffle assembly 813 cooperates with the intake nozzle 811 and the exhaust nozzle 812 respectively.

[0037] It also includes an adjusting screw 83 and a spring 89. The adjusting screw 83 is inserted into the control seat 15 from the outside. The end of the adjusting screw 83 contacts the baffle assembly 813 through the spring 89. The initial position of the baffle assembly 813 is adjusted by the adjusting screw 83.

[0038] Embodiment 2:

[0039] The present invention comprises a channel butterfly plate assembly 1, a pilot valve assembly 7, a torque motor assembly 8, a filter assembly 5, a control conduit assembly, membrane chamber assemblies 2 and 3, an electrical connector, etc. The valve opening can be adjusted by changing the current applied to the torque motor according to the temperature requirement fed back by the system temperature sensor, thereby controlling the cold side flow of the precooler and making the hot side outlet temperature of the precooler meet the requirements of the air source system of the civil aircraft.

[0040] By applying the pneumatic torque motor and valve matching technology, the size of the air inlet and exhaust port is reasonably designed to achieve the matching of control current-control chamber pressure-butterfly plate angle-flow rate.

[0041] A filter assembly is provided at the air inlet of the control air path to filter impurities in the air path and protect the servo control system.

[0042] A pilot valve is provided at the inlet of the control gas circuit to adjust the control gas circuit pressure and reduce the control gas circuit pressure to a certain stable value to provide it to the torque motor, thereby ensuring the stability of the torque motor inlet pressure and improving the control accuracy.

[0043] The membrane cavity structure with diaphragm seal has smaller internal leakage than the traditional graphite seal membrane cavity structure, ensuring stable changes in the opening cavity pressure.

[0044] A pilot valve outlet pressure measuring port, a torque motor outlet pressure measuring port, and a control chamber pressure measuring port are provided, thereby improving the testability of the device.

[0045] Polyimide film is used at the upper and lower ends of the channel to achieve axial and radial sealing, ensuring a certain amount of air and ensuring the external sealing of the device.

[0046] The PFI-1 sealing ring guide is used to ensure high temperature sealing and low friction of the actuator, ensuring the high dynamic stability of the device.

[0047] The connection between the connecting rod and the pin shaft adopts a high wear-resistant DU bushing with self-lubricating function to reduce friction, improve movement reliability, and convert the linear displacement of the entire actuator assembly into angular displacement of the shaft.

[0048] The upper diaphragm chamber assembly 3 and the lower upper diaphragm chamber assembly 2 are mainly composed of a closed position adjustment screw 31, an upper diaphragm chamber shell 32, a diaphragm 33, a spring 24, an actuator 25, a guide ring 26, a rocker arm connecting rod assembly 27, a lower diaphragm chamber shell 28, etc.; they are used to convert aerodynamic force into linear displacement. The control chamber and the feedback chamber of the diaphragm chamber assembly are isolated by the diaphragm assembly. When the torque motor inputs a certain current, the pressure adjusted by the torque motor enters the control chamber, and the feedback chamber is connected to the atmosphere. The pressure difference between the two chambers causes the diaphragm assembly to push the spring to move until the diaphragm is balanced and stabilized at a certain position, so that the rocker arm connecting rod drives the butterfly plate assembly to rotate to a certain angle to achieve flow regulation.

[0049] The torque motor assembly 8 includes a torque motor 81, a torque motor main shaft 82, an adjusting screw 83, a hexagonal nut 84, a washer 85, a stopper 86, a graphite sealing gasket 87, a sealing ring 88, a spring 89, a downstream interface 810, an intake nozzle 811, an exhaust nozzle 812, a baffle assembly 813, a tightening screw 814, a control seat 815, etc. The torque motor controls the actuator structure by changing the flow area at the intake nozzle and the exhaust nozzle according to the control current and changing the pressure entering the control chamber.

[0050] The control current comes from the system controller, specifically from the downstream temperature, and the purpose is to adjust the flow rate by adjusting the angle of the disc plate, thereby adjusting the downstream temperature.

[0051] The control amount of the torque motor is very precise, but the flow rate that can be adjusted is limited. The use of a diaphragm assembly can amplify the precisely controlled flow rate of the torque motor.

[0052] The fan air valve is installed at the downstream of the cold side outlet of the precooler of the aircraft air source system, and the precooler hot side downstream provides air to the pressure pipe. In the initial state, the torque motor is not energized, and the butterfly plate is closed under the action of the closing chamber spring force; after the product is installed in the system, the air supply of the control gas circuit and the torque motor are energized. First, according to the air conditioning system and the anti-icing air temperature requirements, the air source system sets the expected value of the precooler hot side outlet temperature, and the electronic controller outputs the corresponding current to the fan air valve torque motor. According to the current of the torque motor, the opening of the torque motor intake nozzle and exhaust nozzle is controlled. The opening chamber pressure changes accordingly and acts on the diaphragm assembly, prompting the rocker arm connecting rod mechanism to drive the butterfly plate to rotate. Under the action of the large spring of the closing chamber of the diaphragm chamber assembly and the opening chamber pressure, the fan air valve moves to the open position to control the opening of the product butterfly plate and the valve butterfly plate opening. The fan air valve outputs the corresponding cold side flow value, which is adjusted by the precooler to achieve the purpose of accurately controlling the hot side outlet temperature of the precooler.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A pneumatic servo-controlled fan air valve, characterized in that: The invention comprises a channel butterfly plate assembly (1), a pilot valve assembly (7), a torque motor assembly (8), a filter assembly (5), an upper membrane chamber assembly (3), a lower membrane chamber assembly (2) and a pressure-guiding pipe (4). The gas connected to the pressure-guiding pipe (4) enters the torque motor assembly (8) through the filter assembly (5) and the pilot valve assembly (7) in turn. The torque motor assembly (8) adjusts the opening and exhaust according to the magnitude of the applied current. The airflow after the opening adjustment enters the upper membrane chamber assembly (3). A diaphragm-type differential pressure structure is formed between the upper membrane chamber assembly (3) and the lower membrane chamber assembly (2). The lower membrane chamber assembly (2) controls the opening of the channel butterfly plate assembly (1) according to the air pressure in the upper membrane chamber assembly (3). The channel butterfly plate assembly (1) is arranged on the aircraft pre-cooling air path.

2. A pneumatic servo-controlled fan air valve according to claim 1, characterized in that: According to the temperature requirement fed back by the system temperature sensor, the current applied to the torque motor assembly (8) is changed to adjust the valve opening, thereby controlling the cold side flow of the precooler connected to the channel butterfly plate assembly (1) so that the outlet temperature of the hot side of the precooler meets the requirements of the aircraft air source system.

3. A pneumatic servo-controlled fan air valve according to claim 1, characterized in that: A mechanical indicating mechanism (9) is also provided at the bottom of the channel butterfly plate assembly (1), and the mechanical indicating mechanism (9) indicates the opening degree of the disc plate in the channel butterfly plate assembly (1) at that time.

4. A pneumatic servo-controlled fan air valve according to claim 1, characterized in that: The disc plate of the channel disc assembly (1) is also connected to a manual opening and closing structure.

5. The pneumatic servo-controlled fan air valve according to claim 1, characterized in that: The upper diaphragm chamber assembly (3) includes a closing position adjusting screw (31), an upper diaphragm chamber shell (32), and a diaphragm (33); the lower diaphragm chamber assembly (2) includes a spring (24), an actuator (25), a guide ring (26), a rocker arm connecting rod assembly (27), and a lower diaphragm chamber shell (28); the upper diaphragm chamber shell (32) and the lower diaphragm chamber shell (28) are separated by a diaphragm (33); the diaphragm (33) is an elastic structure; the actuator (25) is arranged in the lower diaphragm chamber shell (28); one end of the rocker arm connecting rod assembly (27) is connected to the diaphragm (33) and transmits the changes of the diaphragm (33); the rocker arm connecting rod assembly (27) passes through the actuator (25) and is fixed to the lower diaphragm chamber shell (28) through a rocker arm structure connected by a rotating shaft; the spring (24) is arranged between the inside of the lower diaphragm chamber shell (28) and the diaphragm; the guide ring (26) is arranged on the outside of the actuator (25).

6. A pneumatic servo-controlled fan air valve according to claim 1, characterized in that: The torque motor assembly (8) includes a torque motor (81) and a control seat (15). The control seat (815) is arranged outside the output end of the torque motor (81). The control seat (815) has an internal cavity. The control seat (815) is integrated with an intake nozzle (811), an exhaust nozzle (812) and a downstream interface (810) connected to the internal cavity; the front end of the intake nozzle (811) is a pilot valve assembly (87), and the rear end of the downstream interface (810) is an upper membrane cavity assembly (83); the torque motor main shaft (82) of the torque motor (81) controls the rotation of the baffle assembly (813), and the rotation angle of the baffle assembly (813) adjusts the opening of the intake nozzle (811) and the exhaust nozzle (812).

7. A pneumatic servo-controlled fan air valve according to claim 6, characterized in that: The middle part of the baffle assembly (813) is fixedly connected to the torque motor main shaft (82), and the air intake nozzle (811) and the exhaust nozzle (812) are arranged in the radial direction of the torque motor main shaft (82); the sealing surface of the baffle assembly (813) cooperates with the air intake nozzle (811) and the exhaust nozzle (812) respectively.

8. A pneumatic servo-controlled fan air valve according to claim 7, characterized in that: The invention also comprises an adjusting screw (83) and a spring (89). The adjusting screw (83) is inserted into the control seat (15) from the outside. The end of the adjusting screw (83) contacts the baffle assembly (813) through the spring (89). The initial position of the baffle assembly (813) is adjusted by the adjusting screw (83).

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