A fuel nozzle test connection device having a cylindrical oil inlet and method of use

Abstract

The application relates to the technical field of aircraft engine part manufacturing, in particular to a fuel nozzle test connecting device with a cylindrical oil inlet and a use method, which comprises a joint, a plugging seat and an adapter pipe which are coaxial and connected, the adapter pipe is used for connecting a device to be connected; the plugging seat is arranged in steps; a retaining ring is fixed on the steps of the plugging seat through a nut; a retaining block is matched with an assembly section of the retaining ring to form a hollow cylinder, and the hollow cylinder is matched with a nozzle oil inlet end. The hollow cylinder formed by the assembly section of the retaining block and the retaining ring is used for connecting the nozzle oil inlet end, in order to guarantee the stability and reliability of the connection, the joint, the retaining ring and the nut are designed to form multiple constraints for fixing the retaining block, good sealing performance and vibration resistance can be realized, assembly and disassembly are facilitated, and maintainability is improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engine parts manufacturing technology, specifically to a fuel nozzle test connection device with a cylindrical oil inlet and its usage method. Background Technology

[0002] In aero-engines, nozzles must undergo flow characteristic tests on testing equipment after machining to verify whether they meet design requirements. Usually, nozzle parts are connected to testing equipment using threaded connections, but the oil inlet of a certain type of fuel nozzle is a cylindrical, unthreaded structure.

[0003] A search revealed that CN103267187B discloses a spherical fuel manifold connector and a quick connector for a testing apparatus. This design proposes a connection method using an arc-shaped structure to hook the step (spherical head conical surface) of the component. However, this structure is only suitable for low-pressure testing (test pressure < 3 MPa). Once the pressure increases, the connector will misalign and leak oil, making the test impossible. CN112178335B discloses a fuel manifold adapter and its usage method. This patent applies to an "L"-shaped fuel inlet, which is completely inapplicable to the components involved in this invention. Summary of the Invention

[0004] To address the problem that existing adapters cannot be used with certain types of fuel nozzles that have a cylindrical, unthreaded inlet, this invention provides a fuel nozzle test connection device with a cylindrical inlet.

[0005] This invention is achieved through the following technical solution: A fuel nozzle test connection device with a cylindrical fuel inlet, comprising: The connector includes a coaxial and connected plug seat and an adapter tube, the adapter tube being used to connect the equipment to be connected; the plug seat is stepped. The retaining ring is fixed to the step of the sealing seat by a nut; The stop block and the assembly section of the stop block and the retaining ring are fitted together to form a hollow cylinder, which is fitted to the oil inlet end of the nozzle.

[0006] Preferably, the sealing seat includes a first sealing section and a second sealing section connected in sequence, and the diameter of the first sealing section is smaller than the diameter of the second sealing section; the first sealing section is connected to the transfer pipe.

[0007] Preferably, the assembly section of the retaining ring is semi-circular, the stop block is semi-circular, and the two are combined to form a hollow cylinder.

[0008] Preferably, the assembly section and the stop are detachably connected.

[0009] Preferably, the inner shape of the hollow cylinder is machined according to the outer surface shape of the nozzle inlet section.

[0010] Preferably, the radial clearance between the hollow cylinder and the nozzle inlet section is 0.2 to 0.3 mm.

[0011] Preferably, the retaining ring also includes an annular threaded section, the outer surface of which is connected to the nut.

[0012] Preferably, the radial clearance between the inner cavity of the threaded section and the second sealing section is 0.05~0.1mm.

[0013] Preferably, a sealing plate is provided at the end of the nut away from the retaining ring, and the adapter pipe passes through the sealing plate.

[0014] A method of using the fuel nozzle test connection device with a cylindrical fuel inlet, comprising: S1, Install the retaining ring on the oil inlet end with the mounting parts; S2, assemble the stop block and retaining ring; S3, Assemble the connector so that the sealing seat of the connector is located in the retaining ring; S4, slip the nut onto the adapter pipe and connect the nut and retaining ring until the other end of the sealing seat is flush with the end face of the part.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a fuel nozzle test connection device with a cylindrical fuel inlet, comprising a fastening structure of a connector, a retaining ring, and a nut. Specifically, the assembly sections of the retaining block and the retaining ring mate to form a hollow cylinder, which is inserted into the connection hole at the fuel inlet end of the nozzle. The connector is located on the outside of the retaining block, and its inner wall has a stepped structure that matches the outer contour of the retaining block for axial restraint; the retaining ring provides radial support to the retaining block from the inside. Finally, the nut is tightened into the external thread of the connector, pressing the retaining block, retaining ring, and connector together into a single unit, forming multiple constraints. This invention not only achieves good sealing and vibration resistance but also facilitates assembly and disassembly, and improves maintainability. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the overall structure of a fuel nozzle test connection device with a cylindrical oil inlet according to the present invention. Figure 2 This is a cross-sectional schematic diagram of the overall structure of a fuel nozzle test connection device with a cylindrical oil inlet according to the present invention from another perspective. Figure 3 This is a side view of the stop block in this invention; Figure 4 This is a bottom view of the stop block in this invention; Figure 5 This is a front view of the retaining ring in this invention; Figure 6This is a cross-sectional view of the retaining ring in this invention; Figure 7 This is a schematic diagram of the connector structure in this invention; Figure 8 This is a schematic diagram of the nut structure in this invention.

[0017] In the diagram, 1. Stop block; 2. Retaining ring; 2-1. Threaded section; 2-2. Assembly section; 3. Connector; 3-1. Sealing seat; 3-1-1. Second sealing section; 3-1-2. First sealing section; 3-2. Adapter pipe; 4. Nut; 5. Pin; 6. Screw. Detailed Implementation

[0018] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0019] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0020] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0021] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0022] This invention discloses a fuel nozzle test connection device with a cylindrical fuel inlet, comprising: The connector 3 includes a coaxial and connected plug seat 3-1 and a transfer tube 3-2, the transfer tube 3-2 being used to connect the device to be connected; the plug seat 3-1 is stepped; the plug seat 3-1 includes a first plug section 3-1-2 and a second plug section 3-1-1 connected in sequence, and the diameter of the first plug section 3-1-2 is smaller than the diameter of the second plug section 3-1-1; the first plug section 3-1-2 is connected to the transfer tube 3-2.

[0023] The retaining ring 2 includes a circular threaded section 2-1 and an assembly section 2-2. The outer surface of the threaded section 2-1 of the retaining ring 2 is threaded, and the nut 4 fixes the retaining ring 2 to the step of the sealing seat 3-1 through the thread.

[0024] The stop block 1 and the assembly section 2-2 of the retaining ring 2 mate to form a hollow cylinder. The inner shape of the hollow cylinder is machined according to the outer surface shape of the nozzle inlet section so that the hollow cylinder can fit with the nozzle inlet end. Specifically, the assembly section 2-2 of the retaining ring 2 is semi-circular, and the stop block 1 is semi-circular. The two combine to form a hollow cylinder. Assembly section 2-2 is detachably connected to stop 1, such as by pin, screw 6, nut 4, etc.

[0025] The radial clearance between the hollow cylinder and the nozzle inlet section is 0.2 to 0.3 mm. The radial clearance between the inner cavity of the threaded section 2-1 and the second sealing section 3-1-1 is 0.05 to 0.1 mm.

[0026] A sealing plate is provided at the end of nut 4 away from retaining ring 2, and adapter pipe 3-2 passes through the sealing plate.

[0027] This invention also discloses a method for using a fuel nozzle test connection device with a cylindrical fuel inlet, comprising: S1, Install the retaining ring 2 on the oil inlet end with the mounting parts; S2, assemble stop block 1 and stop ring 2; S3, assemble connector 3 so that the sealing seat 3-1 of connector 3 is located in retaining ring 2; S4, insert nut 4 from adapter pipe 3-2 and connect nut 4 and retaining ring 2 until the other end of sealing seat 3-1 is flush with the end face of part.

[0028] This invention utilizes the hollow cylinder formed by the assembly section 2-2 of the stop block 1 and the retaining ring 2 to connect the oil inlet end of the nozzle. In order to ensure the stability and reliability of the connection, the connector 3, the retaining ring 2 and the nut 4 are designed to form multiple constraints to fix the stop block 1. This not only achieves good sealing and vibration resistance, but also facilitates assembly and disassembly, and improves maintainability.

[0029] In a specific embodiment, the adapter for testing the cylindrical oil inlet nozzle includes a stop block 1, a retaining ring 2, a connector 3, a nut 4, a pin 5, and a screw 6. Specifically: The stop block 1 has a "tile"-shaped structure. Its inner shape is machined according to the outer surface of the nozzle inlet section, and it is a hollow semi-circular body with a stepped inner hole. After the stop block 1 and the retaining ring 2 are combined, the inner hole formed has a gap of approximately 0.2 (radial) mm with the outer shape of the part. The length of the stop block 1 is consistent with the length of the assembly section 2-2 of the retaining ring 2. The two wing planes of the tile have a total of 4 Φ4.5 through holes and 2 Φ4 through holes machined. The pin hole and six R4 countersunk holes are evenly distributed on both wings, corresponding to the M4 threaded hole and Φ4 pin hole on the section plane of the assembly section 2-2 of the retaining ring 2. In use, the pin 5 passes through the pin hole, the screw 6 passes through the Φ4.5 bottom hole, the screw head is seated in the R4 countersunk hole, and screwed into the M4 threaded hole of the retaining ring 2. In order to ensure that the parts are tightly held after the retaining block 1 and the retaining ring 2 are combined, the plane of the retaining block 1 is offset from the theoretical center by 1mm.

[0030] The retaining ring 2 is a composite structure. The threaded section 2-1 of the retaining ring 2 is a hollow cylinder, and the assembly section 2-2 is a semi-circular structure; the two are coaxial. The outer diameter of the threaded section 2-1 is machined with an M42×1.5 thread, which mates with the internal thread of the nut 4. The inner cavity of the threaded section 2-1 mates with the second sealing section 3-1-1, with a clearance of approximately 0.1mm (radial). The inner shape of the assembly section 2-2 is machined according to the outer surface shape of the nozzle inlet section, mates with the stop block 1, forming a hollow cylinder. To ensure that the parts are tightly held together after the stop block 1 and retaining ring 2 are combined, the distance between the plane of the assembly section 2-2 and the theoretical center is 1mm. The clearance between the assembly section 2-2 and the outer surface of the parts after the assembly section and stop block 1 are combined is approximately 0.1mm. The plane of the assembly section 2-2 has four M4 threaded holes and two Φ4 threaded holes. +0.012 The pin holes are located at four Φ4.5 through holes and two Φ4 through holes on the two wings of the stop block 1. The pin holes correspond one-to-one; pin 5 is assembled at two Φ4 positions on the plane of assembly section 2-2 of retaining ring 2. +0.012 The pin hole serves as a positioning element; the screw 6 passes through the four Φ4.5 through holes of the stop block 1 and is screwed into the four M4 threaded holes on the plane of the assembly section 2-2 of the retaining ring 2 to tighten the nozzle.

[0031] Connector 3 is an assembly, including a sealing seat 3-1 and a transfer pipe 3-2. The sealing seat 3-1 is a hollow stepped cylinder; the outer diameter of the second sealing section 3-1-1 is consistent with the theoretical size of the oil inlet section diameter of the part, and it matches the inner diameter of the threaded section 2-1 of the retaining ring 2, with a clearance of 0.1mm (radial); the right end face of the second sealing section 3-1-1 has an annular groove, in which a rectangular sealing ring is installed; the transfer pipe 3-2 is composed of standard pipelines, with the left end head thread M14×1.5 matching the equipment connector thread, and the right end connected to the first sealing section 3-1-2.

[0032] Nut 4 is a through-type nut, with a Φ20 opening on the sealing plate on its left end face. +0.02 The small through hole 4-1, the first sealing section 3-1-2 of the connector 3 and the adapter pipe 3-2 pass through the nut through hole 4-1, and the M42×1.5 internal thread on the right side mates with the M42×1.5 external thread of the thread section 2-1 of the retaining ring 2.

[0033] The sealing ring has a circular structure and is made of polytetrafluoroethylene. Its outer diameter and inner diameter are consistent with the size of the nozzle inlet.

[0034] Pin 5 and screw 6 are standard parts.

[0035] The steps for using the connecting device mentioned in the embodiment are as follows: S1, attach the rear half 2.2 of the retaining ring 2 to the outer shape of the oil inlet section of the part.

[0036] S2, align the pin hole of the stop block 1 with the pin 4 mounted on the retaining ring 2, and connect the pin 4 with the retaining ring 2 so that the pin 4 passes through the pin hole of the stop block 1. The screw 6 passes through the countersunk hole and bottom hole of the stop block 1 and is screwed into the threaded hole of the retaining ring 2 to tighten.

[0037] S3, insert the sealing seat 3-1 of the connector 3 into the inner hole of the threaded section of the retaining ring 2, and the end face of the large cylinder 3.1.1 on the right side of the sealing seat 3-1 is in contact with the end face of the part.

[0038] S4, nut 4 is inserted into connector 3, and adapter pipe 3-2 is screwed onto the external thread of retaining ring 2 through the end face through hole 4-1 of nut 4. Tightening presses down on the first sealing section 3-1-2 of the sealing seat 3-1 of connector 3, ensuring that the sealing ring on the end face of the second sealing section 3-1-1 on the right side of the sealing seat 3-1 is tightly against the end face of the part. The tightening force of nut 4 causes a slight deformation of the sealing ring, ensuring a seal.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A fuel nozzle test connection device with a cylindrical fuel inlet, characterized in that, include: The connector (3) includes a coaxial and connected plug seat (3-1) and a transition pipe (3-2), the transition pipe (3-2) being used to connect the device to be connected; the plug seat (3-1) is stepped. The retaining ring (2) is fixed to the step of the sealing seat (3-1) by a nut (4); The stop block (1) and the assembly section (2-2) of the stop block (1) and the retaining ring (2) are fitted together to form a hollow cylinder, which is fitted with the oil inlet end of the nozzle.

2. The fuel nozzle test connection device with a cylindrical oil inlet according to claim 1, characterized in that, The sealing seat (3-1) includes a first sealing section (3-1-2) and a second sealing section (3-1-1) connected in sequence, and the diameter of the first sealing section (3-1-2) is smaller than the diameter of the second sealing section (3-1-1); the first sealing section (3-1-2) is connected to the transfer pipe (3-2).

3. The fuel nozzle test connection device with a cylindrical oil inlet according to claim 1, characterized in that, The assembly section (2-2) of the retaining ring (2) is semi-circular, and the stop block (1) is semi-circular. The two are combined to form a hollow cylinder.

4. The fuel nozzle test connection device with a cylindrical oil inlet according to claim 1, characterized in that, The assembly section (2-2) and the stop block (1) are detachably connected.

5. The fuel nozzle test connection device with a cylindrical oil inlet according to claim 1, characterized in that, The inner shape of the hollow cylinder is machined according to the outer surface shape of the nozzle oil inlet section.

6. The fuel nozzle test connection device with a cylindrical oil inlet according to claim 1, characterized in that, The radial clearance between the hollow cylinder and the nozzle inlet section is 0.2–0.3 mm.

7. The fuel nozzle test connection device with a cylindrical oil inlet according to claim 1, characterized in that, The retaining ring (2) also includes a circular threaded section (2-1), the outer surface of which is connected to the nut (4).

8. The fuel nozzle test connection device with a cylindrical oil inlet according to claim 7, characterized in that, The radial clearance between the inner cavity of the threaded section (2-1) and the first sealing section (3-1-2) is 0.05~0.1mm.

9. The fuel nozzle test connection device with a cylindrical oil inlet according to claim 1, characterized in that, A sealing plate is provided at the end of the nut (4) away from the retaining ring (2), and the adapter pipe (3-2) passes through the sealing plate.

10. A method of using a fuel nozzle test connection device with a cylindrical fuel inlet as described in any one of claims 1 to 9, characterized in that: S1, Install the retaining ring (2) on the oil inlet end with the mounting parts; S2, assemble the stop block (1) and the retaining ring (2); S3, assemble the connector (3) so that the sealing seat (3-1) of the connector (3) is located in the retaining ring (2); S4, insert the nut (4) from the adapter pipe (3-2) and connect the nut (4) and the retaining ring (2) until the other end of the sealing seat (3-1) is flush with the end face of the part.

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