Mechanical tripping device

Abstract

The invention discloses a mechanical tripping device, which belongs to the technical field of engines and comprises a tripping assembly, a reset lifting pin assembly, an input shaft and a tripping shaft. The tripping assembly comprises a limiting sleeve, a tripping spring and a tripping ejector rod which are matched with one another, and a limiting groove is formed in the side wall of the tripping ejector rod. The reset lifting pin assembly comprises an executing mechanism and a limiting pin, and the limiting pin is limited in the limiting groove. The input shaft is used for transmitting torque of an engine to the tripping shaft. And the peripheral side wall of the tripping shaft is provided with a spiral surface which is arranged opposite to the end part of the tripping ejector rod. The tripping device controls an execution mechanism to start and drive a limiting pin to be separated from a limiting groove by collecting abnormal rotation information of an engine rotor, so that a tripping ejector rod is pushed by a tripping spring to make contact with a tripping shaft, and the end of the tripping ejector rod relatively moves along a spiral face on the side wall of the tripping shaft; and the tooth end of the tripping shaft is driven to be separated from the tooth end of the input shaft under the limiting and guiding action of the spiral surface, so that the tripping action is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of engines, and in particular relates to a mechanical tripping device. Background Art

[0002] In existing aircraft engines, abnormal conditions during operation can cause the rotor to continue to rotate in an uncontrolled state, which may cause wear of structural parts, increased vibration, and even cause serious damage to the engine system, posing a safety hazard. Therefore, in order to prevent the rotor from losing control under abnormal conditions, thermal protection devices are usually used in the prior art for protection. When the thermal protection device detects that the engine is overheating, it triggers the tripping mechanism by melting the hot melt, forcing the engine rotor to stop rotating and preventing further damage. However, this tripping protection method still has the following limitations:

[0003] First, the working mechanism of the thermal protection device is relatively complex, usually relying on the coordinated work of multiple components, including thermistors, hot melt blocks, and tripping mechanisms, which makes the overall structure complex. In addition, the material requirements for the hot melt block are relatively high. It must not only meet a certain melting temperature, but also have good environmental tolerance, which makes the manufacturing and maintenance costs of this thermal protection device relatively high. Secondly, the thermal protection device is mainly based on a passive protection mode. Only when the engine overheats and the temperature reaches a certain threshold will the hot melt block melt and trigger the trip. Therefore, when abnormal operating conditions other than temperature rise occur, such as abnormal vibration or mechanical failure, the thermal protection device cannot provide effective protection and there is a risk of delay or failure.

[0004] In addition, the existing thermal trip protection device needs to be disassembled and the hot melt block replaced before it can be reset after tripping. This design does not have an automatic reset function, which increases the complexity and periodicity of maintenance, and also requires maintenance personnel to have professional skills to replace and inspect parts. Especially in the case of intensive use or continuous operation of aircraft, the maintenance frequency is high and the time is tight. This manual reset method will undoubtedly have an adverse impact on the efficiency and economy of use. Summary of the invention

[0005] The object of the present invention is to provide a mechanical tripping device to solve the above problems in the prior art.

[0006] A mechanical tripping device is provided, comprising:

[0007] A trip assembly, comprising a limit sleeve, a trip spring and a trip push rod, wherein the trip push rod movable sleeve is arranged inside the limit sleeve, the trip spring is clamped between the limit sleeve and the trip push rod, and a limit groove is provided on the side wall of the trip push rod;

[0008] A reset ejector pin assembly, comprising an actuator and a limit pin, wherein the limit pin is limited inside the limit slot, and the actuator is used to drive the limit pin to disengage from the limit slot;

[0009] An input shaft, the input shaft being used to transmit the torque of the engine;

[0010] A release shaft is matched with the input shaft through end teeth, and the outer side wall of the release shaft is provided with a spiral surface arranged opposite to the end of the release push rod.

[0011] As a further embodiment of the present invention: the limit sleeve includes a reset rod and a support bushing, the release push rod is movably sleeved inside the support bushing, the release spring is limited between the support bushing and the release push rod, the reset rod movably penetrates the support bushing and can drive the release push rod to move axially inside the support bushing.

[0012] As a further embodiment of the present invention: the reset rod is fixedly connected to the tripping top rod, and a limiter that moves within a certain travel range is provided between the reset rod and the support bushing.

[0013] As a further embodiment of the present invention: the limit member includes a locking pin and a through slot formed on the reset rod, the locking pin is fixedly connected to the support bushing, and the locking pin can slide relative to the through slot inside the through slot.

[0014] As a further embodiment of the present invention: a limiting member that moves within a certain travel range is provided between the reset rod and the tripping top rod.

[0015] As a further embodiment of the present invention: the limit member includes a locking pin and a through slot formed on the reset rod, the locking pin is fixedly connected to the tripping top rod, and the locking pin can slide relative to the through slot inside the through slot.

[0016] As a further embodiment of the present invention: the limit sleeve also includes a compression spring, the side wall of the reset rod extends outward to form a support, and the compression spring is sleeved on the periphery of the reset rod and clamped between the support bushing and the support.

[0017] As a further embodiment of the present invention: the reset pin assembly also includes a reset spring, the actuator is a solenoid valve, the limit pin is movably sleeved inside the solenoid valve, and the reset spring is clamped between the limit pin and the solenoid valve.

[0018] As a further embodiment of the present invention: the tripping shaft includes an outer shaft, an inner shaft and an ejection spring, the outer shaft and the input shaft are matched through the tooth ends, the outer shaft and the inner shaft only have the freedom of translation in the axial direction, the ejection spring is clamped between the outer shaft and the inner shaft, and the outer side wall of the outer shaft is provided with a spiral surface arranged opposite to the end of the tripping ejector rod.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The tripping device collects information about abnormal rotation of the engine rotor, actively sends a signal to control the actuator to start, and the actuator drives the limit pin to disengage from the limit groove, so that the tripping top rod contacts the tripping shaft under the push of the tripping spring, and the end of the tripping top rod moves relatively along the helical surface on the side wall of the tripping shaft. Under the limiting guidance of the helical surface, the tooth end of the tripping shaft is driven to disengage from the tooth end of the input shaft, realizing the tripping action, disconnecting the torque transmission, and thus protecting the engine. The tripping device can accurately control the tripping action, and has a simple structure, is not affected by the surrounding environment such as temperature, and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the state of cooperation between the drill bit and the cutter body provided by the present invention;

[0023] Figure 2 A schematic diagram of the structure of the helicoid provided by the present invention;

[0024] Figure 3 This is a schematic structural diagram of the trip assembly provided by the present invention.

[0025] In the figure: 1. trip assembly; 11. limit sleeve; 111. reset rod; 112. support bushing; 113. compression spring; 12. trip spring; 13. trip ejector rod; 14. limit groove; 2. reset ejector pin assembly; 21. actuator; 22. limit pin; 23. reset spring; 3. input shaft; 4. trip shaft; 41. helical surface; 42. outer shaft; 43. inner shaft; 44. ejector spring; 51. locking pin; 52. through groove. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0027] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0028] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present invention and are not intended to limit the subject matter described in the claims.

[0029] See also Figure 1-2 As shown, the mechanical tripping device in the embodiment of the present invention includes a tripping assembly 1, a reset pin assembly 2, an input shaft 3 and a tripping shaft 4. The tripping assembly 1 includes a limit sleeve 11, a tripping spring 12 and a tripping top rod 13. The tripping top rod 13 is movably sleeved inside the limit sleeve 11. The tripping spring 12 is clamped between the limit sleeve 11 and the tripping top rod 13. The side wall of the tripping top rod 13 is provided with a limit groove 14. The reset pin assembly 2 includes an actuator 21 and a limit pin 22. The limit pin 22 is limited inside the limit groove 14. The actuator 21 is used to drive the limit pin 22 to disengage from the limit groove 14. The input shaft 3 is used to transmit the torque of the engine. The tripping shaft 4 is matched with the input shaft 3 through the end teeth, and the outer side wall of the tripping shaft 4 is provided with a spiral surface 41 arranged opposite to the end of the tripping top rod 13.

[0030] The limiting sleeve 11 is fixed on the casing, the tripping top rod 13 can slide inside the limiting sleeve 11, and the tripping spring 12 is located between the tripping top rod 13 and the limiting sleeve 11. When the tripping top rod 13 is in a state of waiting to be triggered by the limiting pin 22 and the limiting groove 14, the tripping spring 12 is in a compressed state, so that the tripping top rod 13 has the potential energy to pop out. The actuator 21 has a driving function, which is used to drive the limiting pin 22 to move in the axial direction, so that the limiting pin 22 and the limiting groove 14 are engaged or disengaged. The input shaft 3 rotates under the drive of the engine, and the input shaft 3 and the tripping shaft 4 transmit torque through the cooperation of the tooth end, driving the tripping shaft 4 to rotate under the support of the bearing. The output end of the tripping push rod 13 is designed as an arc surface. After the tripping push rod 13 is excited, the arc surface at the end can contact the spiral surface 41 outside the tripping shaft 4. Under the continuous rotation of the tripping shaft 4, since the position of the tripping push rod 13 remains unchanged, the tripping shaft 4 moves away from the input shaft 3 under the interference limit of the spiral surface 41, thereby disengaging the tripping shaft 4 from the input shaft 3, thereby stopping the rotation of the main shaft in the abnormal state.

[0031] Specifically, the limiting sleeve 11 includes a reset rod 111 and a support bushing 112, and the support bushing 112 is fixed on the casing. The tripping top rod 13 can slide inside the support bushing 112, and the tripping spring 12 is limited between the support bushing 112 and the tripping top rod 13. The reset rod 111 movably penetrates the support bushing 112 and can drive the tripping top rod 13 to move axially inside the support bushing 112. When the tripping top rod 13 is stimulated to pop out and the tripping shaft 4 is disengaged from the input shaft 3, the tripping top rod 13 needs to be reset to ensure that the tripping device can be reused. At this time, the reset rod 111 can be pulled to make the tripping top rod 13 overcome the potential energy of the tripping spring 12 and retreat, and then the actuator 21 is started to limit the limit pin 22 to the limit groove 14 again, completing the reset of the tripping device.

[0032] In one embodiment, the reset rod 111 is fixedly connected to the tripping top rod 13, and a limiter that moves within a certain range of travel is provided between the reset rod 111 and the support bushing 112. Under this scheme, after the tripping top rod 13 is ejected, it simultaneously drives the reset rod 111 to move, and can only move a certain distance under the interference of the limiter between the reset rod 111 and the support bushing 112, so as to prevent the tripping top rod 13 from being ejected excessively. When the tripping top rod 13 needs to be reset, it is only necessary to pull the reset rod 111 to make the tripping top rod 13 overcome the elastic force of the tripping spring 12 and retreat.

[0033] Furthermore, the position-limiting member includes a locking pin 51 and a through slot 52 formed on the reset rod 111. At least one end of the locking pin 51 is fixedly connected to the support bushing 112, and the locking pin 51 is located inside the through slot 52. The through slot 52 has a certain length along the length direction of the reset rod 111, so that the locking pin 51 has a certain sliding stroke in the through slot 52. Through the above structure, the reset rod 111 has a fixed sliding stroke in the support bushing 112, so that the tripping push rod 13 will not move excessively under the restriction of the reset rod 111, and the tripping spring 12 will not be overly compressed when the reset rod 111 drives the tripping push rod 13 to retreat.

[0034] In one embodiment, a limiter that moves within a certain range of travel is provided between the reset rod 111 and the tripping top rod 13, and the reset rod 111 and the tripping top rod 13 can slide relative to each other. In this scheme, a limiter can be provided between a pull ring and a support bushing 112 at the end of the reset rod 111, giving the reset rod 111 a maximum falling position. Under normal conditions, the reset rod 111 is limited to the lowest end of the support bushing 112 by the pull ring. After the tripping top rod 13 is ejected, it can only move a certain distance under the interference of the limiter between the reset rod 111 and the tripping top rod 13, so as to prevent the tripping top rod 13 from being ejected excessively. When the tripping top rod 13 needs to be reset, it is only necessary to pull the reset rod 111 to move a certain distance to cause interference between the limiter and the tripping top rod 13, and then pull the tripping top rod 13 to overcome the elastic force of the tripping spring 12 and retreat.

[0035] Furthermore, the limiting member includes a locking pin 51 and a through slot 52 provided on the reset rod 111, at least one end of the locking pin 51 is fixedly connected to the tripping top rod 13, and the locking pin 51 is located inside the through slot 52. The through slot 52 has a certain length along the length direction of the reset rod 111, so that the locking pin 51 has a certain sliding stroke in the through slot 52. Through the above structure, the tripping top rod 13 has a fixed sliding stroke in the support bushing 112, so that the tripping top rod 13 will not move excessively under the cooperation restriction of the reset rod 111 and the support bushing 112, and will not synchronously drive the reset rod 111 to move when the tripping top rod 13 pops out, and has a faster response speed.

[0036] For further information, see Figure 3As shown, a compression spring 113 is further provided between the reset rod 111 and the support bushing 112, and one end of the compression spring 113 is fixed to a support formed by the side wall of the reset rod 111 extending outward. Since the reset rod 111 and the tripping top rod 13 can slide relative to each other, when the tripping top rod 13 is limited by the limit pin 22, the reset rod 111 has the freedom to slide in the vertical direction. In order to limit the movement of the reset rod 111, the reset rod 111 is forced to be pushed toward the tripping top rod 13 by the compression action of the compression spring 113, so as to prevent the reset rod 111 from moving in the support bushing 112 when it is in a weightless state.

[0037] In one embodiment, a through slot 52 is provided at each end of the reset rod 111, a locking pin 51 is fixedly connected in the support bushing 112 and cooperates with one of the through slots 52, and a locking pin 51 is fixedly connected in the tripping top rod 13 and cooperates with the other through slot 52, and the reset rod 111 and the tripping top rod 13 can slide relative to each other. Under this scheme, the reset rod 111 has a fixed sliding stroke in the support bushing 112, and the tripping top rod 13 and the reset rod 111 also have a fixed sliding stroke, which can simultaneously realize the limited sliding of the tripping top rod 13 and the independent ejection of the tripping top rod 13 without synchronously driving the reset rod 111 to move, and the tripping top rod 13 can be driven to retreat by pulling the reset rod 111.

[0038] Specifically, the reset pin assembly 2 also includes a reset spring 23, the actuator 21 is a solenoid valve, the limit pin 22 is movably sleeved inside the solenoid valve, and the reset spring 23 is clamped between the limit pin 22 and the solenoid valve. A magnet is provided at the output end of the limit pin 22, and an energized coil is provided inside the solenoid valve. Under normal conditions, the limit pin 22 is restricted in the limit slot 14 by the pop-up action of the reset spring 23, and when a tripping operation is required, the coil inside the solenoid valve is energized, and the solenoid valve generates a magnetic field to attract the magnet on the limit pin 22 to move inside the solenoid valve, so that the limit pin 22 is separated from the limit slot 14, thereby realizing the pop-up of the tripping pin 13. When reset is required, it is only necessary to energize and disconnect the solenoid valve, so that the solenoid valve loses its magnetic field, and the limit pin 22 pops out again under the action of the reset spring 23 to cooperate with the limit slot 14, so that the tripping device has an automatic reset function, reducing the complexity of maintenance and overhaul.

[0039] The trip shaft 4 includes an outer shaft 42, an inner shaft 43 and an ejection spring 44, and the outer shaft 42 is matched with the input shaft 3 through the tooth end. The outer shaft 42 and the inner shaft 43 are connected by a spline, and both have only the freedom of translation in the axial direction, so that the inner shaft 43 can rotate synchronously driven by the outer shaft 42. The ejection spring 44 is clamped between the outer shaft 42 and the inner shaft 43, and the outer side wall of the outer shaft 42 is provided with a spiral surface 41 arranged opposite to the end of the tripping ejector 13. When the tripping ejector 13 retreats, the front end inclined surface of the tripping ejector 13 is disengaged from the spiral surface 41 on the outer shaft 42, and the outer shaft 42 loses the limit. Under the action of the ejection spring 44, the outer shaft 42 is pushed toward the input shaft 3 again, so that the outer shaft 42 and the input shaft 3 are re-established. The tooth end connection is realized to realize the automatic reset of the main shaft.

[0040] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the main purpose of the present invention, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A mechanical tripping device, characterized in that: include: A release assembly (1) comprises a limiting sleeve (11), a release spring (12) and a release push rod (13), wherein the release push rod (13) is movably sleeved inside the limiting sleeve (11), the release spring (12) is clamped between the limiting sleeve (11) and the release push rod (13), and a limiting groove (14) is provided on a side wall of the release push rod (13); A reset ejector pin assembly (2), comprising an actuator (21) and a limit pin (22), wherein the limit pin (22) is limited inside the limit slot (14), and the actuator (21) is used to drive the limit pin (22) to disengage from the limit slot (14); An input shaft (3), the input shaft (3) being used to transmit the torque of the engine; A release shaft (4) is provided, wherein the release shaft (4) is matched with an input shaft (3) via end teeth, and the outer side wall of the release shaft (4) is provided with a spiral surface (41) arranged opposite to the end of a release top rod (13).

2. A mechanical tripping device according to claim 1, characterized in that: The limiting sleeve (11) comprises a reset rod (111) and a support sleeve (112); the release push rod (13) is movably sleeved inside the support sleeve (112); the release spring (12) is limited between the support sleeve (112) and the release push rod (13); the reset rod (111) movably penetrates the support sleeve (112) and can drive the release push rod (13) to move axially inside the support sleeve (112).

3. A mechanical tripping device according to claim 2, characterized in that: The reset rod (111) is fixedly connected to the tripping top rod (13), and a limiter that moves within a certain travel range is provided between the reset rod (111) and the support bushing (112).

4. A mechanical tripping device according to claim 3, characterized in that: The position-limiting member comprises a locking pin (51) and a through slot (52) formed on the reset rod (111); the locking pin (51) is fixedly connected to the support bushing (112); and the locking pin (51) can slide inside the through slot (52) relative to the through slot (52).

5. A mechanical tripping device according to claim 2, characterized in that: A limiting member that moves within a certain travel range is provided between the reset rod (111) and the tripping top rod (13).

6. A mechanical tripping device according to claim 5, characterized in that: The limiting member comprises a locking pin (51) and a through slot (52) formed on the reset rod (111); the locking pin (51) is fixedly connected to the tripping top rod (13); and the locking pin (51) can slide inside the through slot (52) relative to the through slot (52).

7. A mechanical tripping device according to claim 5, characterized in that: The limiting sleeve (11) further comprises a compression spring (113); the side wall of the reset rod (111) extends outward to form a support; the compression spring (113) is sleeved on the periphery of the reset rod (111) and clamped between the support bushing (112) and the support.

8. A mechanical tripping device according to claim 1, characterized in that: The reset pin assembly (2) further comprises a reset spring (23); the actuator (21) is a solenoid valve; the limit pin (22) is movably sleeved inside the solenoid valve; and the reset spring (23) is clamped between the limit pin (22) and the solenoid valve.

9. A mechanical tripping device according to claim 1, characterized in that: The release shaft (4) comprises an outer shaft (42), an inner shaft (43) and an ejection spring (44); the outer shaft (42) and the input shaft (3) are matched via tooth ends; the outer shaft (42) and the inner shaft (43) only have the freedom of translation in the axial direction; the ejection spring (44) is clamped between the outer shaft (42) and the inner shaft (43); and the outer side wall of the outer shaft (42) is provided with a spiral surface (41) arranged opposite to the end of the release ejector rod (13).

Images