Double-end threaded connection type quick-release connector

Abstract

The utility model discloses a double-end threaded connection type quick release connector which comprises a male head and a female head, the male head comprises a first outer shell, a first valve seat, a first spring, a first inner shell, a sealing ring and a valve, and the female head comprises a second outer shell, a middle shell, a valve sleeve, a valve assembly, a second valve seat, a second spring, a third spring, a steel ball and a second inner shell. The quick-release connector is a separable and self-sealing mechanical interface for connecting an aircraft fuel system pipeline and a starting oil delivery pipeline, has good heat insulation performance through the multi-layer connecting shell with the cavity in the aspect of fire resistance, ensures the fire resistance of an internal oil delivery channel in a flame environment, and has good heat insulation performance in the aspect of oil delivery performance. The internal flow channel of the joint has few bends, so that the pressure loss of the internal flow channel is avoided, large flow and low flow resistance can be realized, the connection of male heads and female heads in different batches can be ensured to achieve a predetermined function, and the interchangeability and reliability of the joint are improved.

Description

Technical Field

[0001] This utility model relates to the field of quick-release couplings, and specifically discloses a double-threaded quick-release coupling, which is particularly suitable for use in aircraft fuel systems. Background Technology

[0002] Quick-release couplings are mechanical interfaces that connect the end of the fuel supply line in an aircraft fuel system to the engine fuel supply line. They are essential fuel tank accessories for the fuel system, used for the quick connection and disconnection of engine lines and fuel tank connections during engine installation and periodic maintenance. Currently, most quick-release couplings use a steel ball structure. This structure mainly uses two steel balls to circumferentially limit the connection. However, during long-term use, oil contamination in the fuel can easily cause the steel balls to become stuck, leading to jamming during connection or disconnection. Additionally, it can generate mechanical noise under the vibration environment of an aircraft. The biggest advantage of this product is that it solves the problem of fire resistance of aircraft fuel connectors. Utility Model Content

[0003] The purpose of this utility model is to provide a novel double-ended threaded quick-release connector. The connector consists of a male end and a female end. The male end is located on the fuel system side, and the female end is located on the engine system side. The two ends are connected by a double-ended trapezoidal thread, which aims to improve the reliability of the connection. At the same time, when the interface is separated, the male end and the female end can achieve reliable self-sealing performance. After connection, the connection is automatically made open, and the male and female ends are loosened by a slotted interlocking method.

[0004] This utility model provides a self-sealing quick-release connector with a double-ended trapezoidal threaded connection, comprising a male and a female connector. The male connector includes an outer shell, a valve seat, a spring, an inner shell, a sealing ring, and a valve. The fuel inlet and fuel outlet are located at the male connector end, with the inlet situated at the end of the aircraft fuel system. The outer shell and inner shell are hollow cylindrical structures. One end of the outer shell is connected to the fuel system, and the other end is argon-arc welded to one end of the inner shell. A sealing groove is provided on the inner side of the other end of the inner shell to mate with the sealing ring. One end of the valve is sealed to the inner shell via the sealing ring. The valve is sealed, with one end placed inside the cavity formed by the outer shell and the inner shell. The valve seat is placed at the other end of the valve. The spring is sleeved on the outside of the valve, with one end placed in the groove one on the outside of the valve and the other end placed in the groove two of the valve seat. The outer side of the inner shell away from the outer shell is provided with an external thread, and the outer side of the inner shell near the outer shell is provided with an annular flange. The side of the annular flange away from the outer shell is provided with a protrusion along the axial direction. When the male connector is in a non-working state, the valve of the male connector achieves oil circuit cut-off under the action of spring force to prevent residual oil from flowing out of the fuel line.

[0005] The female head includes an outer shell, a middle shell, a valve sleeve, a valve assembly, a valve seat, a spring, a spring, steel balls, and an inner shell. The shells are connected using a multi-layered cavity structure. The outer shell is located outside the middle shell. A cavity is provided between the outer shell and the middle shell to house the spring. A groove is provided on the outer side of the outer shell away from the spring. An annular groove is provided on the outer side of the middle shell, avoiding the cavity, to hold several steel balls. The outer shell and the middle shell transmit torque using the steel balls. An internal thread is provided on the inner side of the other end of the middle shell. The inner shell is located inside the middle shell. One inner end of the inner shell is sealed to the outer side of one end of the valve sleeve, and the other outer side of the inner shell is sealed to the middle shell. The valve seat is located inside the valve sleeve. The valve sleeve, valve seat 2, and inner housing 2 form cavity 3. The spring 3 is placed inside cavity 3. One end of the valve assembly is threadedly connected to the inner side of the valve seat 2 away from the inner housing 2 to form cavity 4. In the connected state, the other end of the valve assembly contacts the end face of the valve near the sealing ring. The internal thread and external thread are threadedly connected. The slot and protrusion are engaged and snapped together. Cavity 1 and cavity 4 are connected. In the separated state, both the male and female heads can achieve self-sealing. When the female head is not in working state, the valve sleeve and sealing structure in the female head are sealed with the vulcanized seal of the valve seat under the action of spring force. This allows residual oil in the engine's fuel supply line to flow out during regular engine maintenance. At the same time, the connecting thread is inside the outer housing, which serves to prevent dust from entering the thread. In the separated state, it can achieve self-sealing of fuel in the pipeline. In the connection process, it has a highly reliable trapezoidal connection thread. The connection and separation operations are simple. In the connected state, it can achieve the characteristics of large flow rate and low flow resistance of fuel. The product consists of a male and a female connector. The male and female connectors are connected by a double-ended trapezoidal thread, and the end has a relaxation structure in which the male head relaxation protrusion and the female head groove engage.

[0006] The connector is manually tightened by turning the female connector to connect the male and female connectors. During the connection process, as the connecting threads mesh, the valves of the male and female connectors move in the opening direction. When the connector is tightened to the end, the valves reach a predetermined opening degree, forming a fuel passage and thus opening the connector's inlet and outlet. Simultaneously, the sliding groove structure of the protective rings between the inner and outer shells of the female connector ensures the freedom of circumferential rotation between the inner and outer shells, preventing the connecting hose at the female connector outlet from tangling. The connection stroke control of the connector, combined with the relationship between the trapezoidal thread formation and the connection stroke from the initial connection position to the connection end, ensures that the loosening of the male and female connectors at the connection end is within a controllable connection error range, determining the uniqueness of the thread and guaranteeing a complete connection of the product, achieving interchangeability between different male and female connectors.

[0007] The beneficial effects of this utility model are:

[0008] This quick-release connector is a separable and self-sealing mechanical interface for connecting aircraft fuel system pipelines and engine fuel lines. In terms of fire resistance, its multi-layered, cavity-filled connecting shell provides excellent heat insulation, ensuring the fire resistance of the internal fuel delivery channels in flame environments. Regarding fuel delivery performance, the connector has few bends in its internal flow channels, avoiding pressure loss and enabling high flow rates and low flow resistance. In terms of manual operation, it ensures that male and female connectors from different batches can be connected to achieve the intended function, improving the interchangeability and reliability of the connector. Attached Figure Description

[0009] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0010] In the attached diagram:

[0011] Figure 1 A schematic diagram of the connection state of the double-threaded quick-release connector provided by this utility model;

[0012] Figure 2 A schematic diagram of the male connector structure of the double-ended threaded quick-release connector provided by this utility model;

[0013] Figure 3 A schematic diagram of the female head structure of the double-threaded quick-release connector provided by this utility model;

[0014] Figure 4 for Figure 1 Enlarged view at point I;

[0015] In the attached diagram: 1-Male connector, 11-Outer shell 1, 12-Valve seat 1, 13-Spring 1, 14-Inner shell 1, 15-Sealing ring, 16-Valve, 17-Cavity 1, 121-Slot 2, 161-Slot 1, 141-External thread, 142-Flange, 143-Protrusion

[0016] 2-Female head, 21-Outer shell II, 22-Middle shell, 23-Valve sleeve, 24-Valve assembly, 25-Valve seat II, 26-Spring II, 27-Spring III, 28-Steel ball, 29-Inner shell II, 211-Slot, 212-Cavity II, 221-Friction-reducing ring, 222-Internal thread, 241-Steel wire retaining ring, 242-Buffer component, 251-Cavity III, 252-Cavity IV, 291-Protective ring, 292-Steel wire, 293-Protective retaining ring, 294-Seal component. Detailed Implementation

[0017] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0018] Please see Figure 1-4 The figure shows a schematic diagram of the double-threaded quick-release connector provided by this utility model. The double-threaded quick-release connector includes a male connector 1 and a female connector 2. The male connector 1 is located on the fuel system side, and the female connector 2 is located on the engine system side. They are connected by a double-ended trapezoidal thread. The male connector 1 (e.g., ...) Figure 2 (As shown) includes an outer shell 11, a valve seat 12, a spring 13, an inner shell 14, a sealing ring 15, and a valve 16. The outer shell 11 and the inner shell 14 are hollow cylindrical structures. One end of the outer shell 11 is connected to the fuel system, and the other end is argon-arc welded to one end of the inner shell 14. The inner side of the other end of the inner shell 14 has a sealing groove that mates with the sealing ring 15. One end of the valve 16 is sealed to the inner shell 14 through the sealing ring 15, and the other end is placed between the outer shell 11 and the inner shell 14. Inside the cavity 17, the valve seat 12 is placed at the other end of the valve 16, and the spring 13 is sleeved on the outside of the valve 16, with one end placed in the groove 161 on the outside of the valve 16 and the other end placed in the groove 121 of the valve seat 12. The inner shell 14 is provided with an external thread 141 on the outer side away from the outer shell 11, and an annular flange 142 is provided on the outer side of the inner shell 14 near the outer shell 11. The annular flange 142 is provided with a protrusion 143 along the axial direction on the side away from the outer shell 11.

[0019] Mother head 2 (e.g.) Figure 3(As shown) includes an outer shell 21, a middle shell 22, a valve sleeve 23, a valve assembly 24, a valve seat 25, a spring 26, a spring 37, steel balls 28, and an inner shell 29. The shells are connected using a multi-layered cavity structure. The outer shell 21 is located outside the middle shell 22. A cavity 212 is provided between the outer shell 21 and the middle shell 22 to house the spring 26. A slot 211 is provided on the outer side of the outer shell 21 away from the spring 26. An annular groove is provided on the outer side of the middle shell 22, avoiding the cavity 212, to house several steel balls 28. The outer shell 21 and the middle shell 22 transmit torque using the steel balls 28. An internal thread 222 is provided on the inner side of the other end of the middle shell 22. The inner shell 29 is located inside the middle shell 22. One end of valve assembly 24 is sealed to the outer side of valve sleeve 23. The other end of inner housing 29 is sealed to the outer side of middle housing 22. Valve seat 25 is placed inside valve sleeve 23. Valve sleeve 23, valve seat 25 and inner housing 29 form cavity 3 251. Spring 3 27 is placed inside cavity 3 251. One end of valve assembly 24 is threaded to the inner side of valve seat 25 away from inner housing 29 to form cavity 4 252. In the connected state, the other end of valve assembly 24 is in contact with the end face of valve 16 near sealing ring 15. The internal thread 222 is threaded to the external thread 141. The slot 211 and the protrusion 143 are engaged and snapped together. Cavity 1 17 is connected to cavity 4 252. In the separated state, both male head 1 and female head 2 can achieve self-sealing.

[0020] A protective ring 291 and a steel wire 292 are fitted at the connection between the inner shell 29 and the middle shell 22. A friction-reducing ring 221 is fitted at the connection between the outer shell 21 and the middle shell 22 near the steel ball 28. A protective retaining ring 293 and a sealing element 294 are fitted at the connection between the inner shell 29 and the valve sleeve 23. A buffer element 242 is provided at the outer side of the valve assembly 24 near the valve 16 where it contacts the valve sleeve 23, and a steel wire retaining ring 241 is fitted at the outer side of the other end where it contacts the valve seat 25.

[0021] During the connection process, the male connector 1 is fixed, and the outlet of the male connector 1 is manually aligned with the inlet of the female connector 2. Then, the outer casing 21 is turned clockwise. As the female connector 2 is continuously screwed in, the valve 16 at the male connector 1 moves towards the outlet under the push of the valve assembly 24. Simultaneously, the valve sleeve 23 at the female connector 2 moves towards the outlet under the action of the inner casing 14. After connection, as shown... Figure 1 As shown, the anti-loosening structure of the male connector 1 and the female connector 2, with the groove 211 and the protrusion 143 engaging and interlocking with each other, is as follows: Figure 4 As shown in the enlarged view, the fuel flow channels inside the product are indicated by the arrows in the figure.

[0022] During the separation process, the outer casing 21 needs to be manually pulled towards the outlet to loosen the male head 1, causing the protrusion 143 to disengage from the female head 2's groove 211. The female head 2 is then turned counterclockwise until it is completely separated from the male head 1. After separation, both the male head 1 and the female head 2 achieve self-sealing. In the separated state, both can achieve self-sealing of the fuel in the pipeline. During connection, it features a highly reliable trapezoidal connection thread, simplifying connection and separation operations. In the connected state, it achieves high fuel flow and low flow resistance. The product consists of a male head and a piece of wood.

[0023] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, are all covered within the scope of the claims of this utility model.

Claims

1. A double-threaded quick-release connector, characterized in that: The device includes a male connector (1) and a female connector (2). The male connector (1) is located on the fuel system side, and the female connector (2) is located on the engine system side. They are connected by a double-ended trapezoidal thread. The male connector (1) includes an outer shell (11), a valve seat (12), a spring (13), an inner shell (14), a sealing ring (15), and a valve (16). The outer shell (11) and the inner shell (14) are hollow cylindrical structures. One end of the outer shell (11) is connected to the fuel system, and the other end is argon-arc welded to one end of the inner shell (14). The inner side of the other end of the inner shell (14) is provided with a sealing groove that cooperates with the sealing ring (15). One end of the valve (16) is connected to the inner shell (14) through the sealing ring. (15) Sealed connection, the other end is placed in the cavity (17) formed by the outer shell (11) and the inner shell (14), the valve seat (12) is placed at the other end of the valve (16), the spring (13) is sleeved on the outside of the valve (16), one end is placed in the groove (161) on the outside of the valve (16), and the other end is placed in the groove (121) of the valve seat (12). The inner shell (14) is provided with an external thread (141) on the outer side away from the outer shell (11), and the inner shell (14) is provided with an annular flange (142) on the outer side near the outer shell (11). The annular flange (142) is provided with a protrusion (143) along the axial direction on the side away from the outer shell (11). The female head (2) includes an outer shell (21), a middle shell (22), a valve sleeve (23), a valve assembly (24), a valve seat (25), a spring (26), a spring (27), a steel ball (28), and an inner shell (29). The shells are connected by a multi-layer cavity structure. The outer shell (21) is placed outside the middle shell (22). A cavity (212) is provided between the outer shell (21) and the middle shell (22) to hold the spring. Spring 2 (26), the outer shell 2 (21) has a groove (211) on the outer side away from spring 2 (26), the middle shell (22) has an annular groove on the outer side away from cavity 2 (212) for placing several steel balls (28), the outer shell 2 (21) and the middle shell (22) use steel balls (28) to transmit torque, the other end of the middle shell (22) has an internal thread (222), the inner shell 2 (29) is placed inside the middle shell (22), the inner... One end of the inner shell (29) is sealed to the outer side of one end of the valve sleeve (23), and the other end of the inner shell (29) is sealed to the outer side of the middle shell (22). The valve seat (25) is placed inside the valve sleeve (23). The valve sleeve (23), the valve seat (25), and the inner shell (29) form a cavity (251). The spring (27) is placed inside the cavity (251). One end of the valve assembly (24) is far from the outer side of the valve seat (25). A cavity four (252) is formed by a threaded connection at one end of the inner shell two (29). In the connected state, the other end of the valve assembly (24) contacts the end face of the valve (16) near the sealing ring (15). The internal thread (222) is threadedly connected to the external thread (141). The slot (211) and the protrusion (143) are engaged and snapped together. The cavity one (17) is connected to the cavity four (252). In the separated state, both the male head (1) and the female head (2) can achieve self-sealing.

2. The double-threaded quick-release connector according to claim 1, characterized in that: A protective ring (291) and a steel wire (292) are provided at the connection between the inner shell (29) and the middle shell (22).

3. The double-threaded quick-release connector according to claim 1, characterized in that: A friction-reducing ring (221) is provided between the outer shell (21) and the middle shell (22) near the steel ball (28).

4. The double-threaded quick-release connector according to claim 1, characterized in that: A protective retaining ring (293) and a sealing element (294) are provided at the connection between the inner shell (29) and the valve sleeve (23).

5. The double-threaded quick-release connector according to claim 1, characterized in that: The valve assembly (24) has a buffer (242) at the outer side of one end near the valve (16) where it contacts the valve sleeve (23), and a wire retaining ring (241) at the outer side of the other end where it contacts the valve seat (25).

Images