CN216692662U - Expansion joint - Google Patents

Abstract

An expansion joint for compensating axial and radial displacement of an air inlet and exhaust pipeline comprises a flexible outer pipe, an inner pipe, an inlet flange and an outlet flange; the inlet flange is connected with the outlet flange through the flexible outer pipe, the inner wall of the outlet flange protrudes inwards to form a limiting ring, and a radial gap is formed between the inner wall of the flexible outer pipe and the outer wall of the inner pipe; the inner tube one end is connected the import flange, the entry of import flange with inject smooth and the even runner of internal diameter between the export of inner tube, other end suspension, the other end of suspension with the inner wall of export flange has radial clearance, and with the spacing ring has axial clearance, the spacing ring with the coaxial setting of runner and have with the internal diameter that the runner is the same.

Description

Expansion joint

Technical Field

The utility model relates to an aircraft engine test, in particular to an expansion joint.

Background

When the aircraft engine is subjected to a full envelope range test, conditions such as the flying height, the flying speed and the like of high altitude or the ground are simulated in a test cabin by means of an air inlet and exhaust system and a pressure temperature regulating system, and the tested engine is operated to a corresponding working state according to the test task requirement in a simulated state.

In order to simulate the environment with different flying heights and flying speeds, the working pressure and temperature ranges of the air inlet and exhaust pipelines are wide, in order to compensate the displacement caused by thermal stress in the air inlet and exhaust pipelines, a compensation device is needed to absorb the axial and radial thermal deformation of the pipelines at the necessary positions of the pipelines, and meanwhile, the compensation device is used for reducing the disturbance to the air flow so as to meet the requirements of the test on the quality of the air inlet and exhaust flow fields.

SUMMERY OF THE UTILITY MODEL

The utility model provides an expansion joint which is suitable for being connected to adjacent external pipelines at two ends respectively and used for compensating axial and radial displacements of an air inlet pipeline and an air outlet pipeline.

According to an embodiment of the utility model, the expansion joint comprises a flexible outer tube, an inner tube, an inlet flange and an outlet flange; the inlet flange is connected with the outlet flange through the flexible outer pipe, the inner wall of the outlet flange protrudes inwards to form a limiting ring, and a radial gap is formed between the inner wall of the flexible outer pipe and the outer wall of the inner pipe; the inner tube one end is connected the import flange, the entry of import flange with inject smooth and the even runner of internal diameter between the export of inner tube, other end suspension, the other end of suspension with the inner wall of export flange has radial clearance, and with the spacing ring has axial clearance, the spacing ring with the coaxial setting of runner and have with the internal diameter that the runner is the same.

In one or more embodiments, the inner tube is axially continuous with the inlet flange, and an inner wall of the inlet flange and an inner wall of the inner tube together define the flow passage.

In one or more embodiments, the inlet flange is sleeved on an outer wall of the inner pipe, and the inner wall of the inner pipe defines the flow passage.

In one or more embodiments, the side of the stop collar facing the other end has a sloped stop collar side wall.

In one or more embodiments, the inlet flange and the outlet flange have stepped faces for alignment of the external conduits.

In one or more embodiments, the flexible outer tube is a bellows.

The embodiment of the utility model has at least one of the following beneficial effects:

1. the flow channel of the expansion joint has smooth wall surface and stable flow area, reduces the expansion of the boundary layer and avoids the disturbance of air flow, thereby ensuring the good quality of the air inlet and exhaust flow field and meeting the test requirements.

2. The expansion joint has the functions of axial expansion and radial fine adjustment, can compensate the axial displacement and the radial displacement of the air inlet and exhaust pipeline, and avoids the stress concentration of the air inlet and exhaust pipeline.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of an expansion joint according to a first embodiment;

FIG. 2 is a partial schematic view of FIG. 1 at A;

FIG. 3 is a partial schematic view of FIG. 1 at B;

FIG. 4 is a partial schematic view of an expansion joint according to a second embodiment;

reference numerals:

1-expansion joint, 11-expansion joint inlet, 12-expansion joint outlet;

2-flexible outer tube, 21-corrugation, 22-flexible outer tube inner wall;

3-inner tube, 31-inner tube flow channel, 31 a-inner tube flow channel inlet, 31 b-inner tube flow channel outlet, 32-inner tube wall, 33-inner tube outer wall;

4-inlet flange, 41-inlet runner, 41 a-inlet runner inlet, 41 b-inlet runner outlet, 42-inlet flange inner wall and 43-inlet flange radial flange;

5-outlet flange, 51-outlet flow channel, 52-limit ring, 52 a-limit ring inner wall, 52 b-limit ring side wall, 53-outlet flange inner wall and 54-outlet flange radial flange;

6-radial clearance;

7-axial clearance;

8-step surface.

Detailed Description

The utility model is further described in the following description with reference to specific embodiments and the accompanying drawings, in which more details are set forth to provide a thorough understanding of the utility model, but it will be apparent that the utility model can be practiced in many other ways than those specifically described herein, and that a person skilled in the art can make similar generalizations and deductions as to the practice of the utility model without departing from the spirit of the utility model, and therefore the scope of the utility model should not be limited by the contents of this specific embodiment.

It is noted that these and other figures which follow are merely exemplary and not drawn to scale and should not be considered as limiting the scope of the utility model as it is actually claimed.

Example one

The terms "radial", "axial", "inner", "outer", etc. are used with reference to the expansion joint 1 being assembled together.

As shown in fig. 1, the expansion joint 1 comprises a flexible outer pipe 2, an inner pipe 3, an inlet flange 4 and an outlet flange 5.

The inlet flange 4 is arranged as an inlet 11 of the expansion joint 1. The inlet flange 4 has an inlet channel 41, the inlet channel 41 is axially through, and has an inlet channel inlet 41a and an inlet channel outlet 41b at two axial ends, the radial boundary of the inlet channel 41 is an inlet flange inner wall 42, and the inlet flange inner wall 42 is smooth and has a uniform diameter from the inlet channel inlet 41a to the inlet channel outlet 41 b. The radial flange 43 of the inlet flange 4 has an arrangement for connecting external pipes, such as threaded through holes.

The outlet flange 5 is arranged as the outlet 12 of the expansion joint 1. The outlet flange 5 has an outlet flow passage 51, the outlet flow passage 51 being defined by a stop ring 52. The retainer ring 52 protrudes radially inward from the inner wall 53 of the outlet flange, the radial boundary of the outlet flow passage 51 is a retainer ring inner wall 52a, and the retainer ring inner wall 52a is smooth and has a uniform diameter. The radial flange 54 of the outlet flange 5 has an arrangement for connecting external pipes, such as threaded through holes.

Further, as shown in fig. 1 to 3, the inlet flange 4 and the outlet flange 5 have a step surface 8, the step surface 8 is used for helping the external pipeline to be aligned with the flanges quickly, specifically, the inlet flange 4 has a convex step surface 8 at the inlet 41a of the inlet flow passage, and the side wall of the retainer ring 52 of the outlet flange 5 and the inner wall 42 of the outlet flange form a concave step surface 8.

Import flange 4 passes through flexible outer tube 2 and connects outlet flange 5, and flexible outer tube 2 is the bellows, and 2 both ends of flexible outer tube weld with import flange 4 and outlet flange 5 respectively, specifically, flexible outer tube inner wall 22 welds with the radial outer wall of import flange 4 and outlet flange 5 respectively at both ends. The flexible outer tube 2 is a corrugated tube, the body of which is at least partially provided with corrugations 21. In another embodiment or embodiments, the flexible outer tube 2 is a metal mesh flexible tube.

The inner tube 3 is arranged to provide an inner tube flow passage 31. The inner tube flow passage 31 is axially through and has an inner tube flow passage inlet 31a and an inner tube flow passage outlet 31b at both axial ends, the inner tube flow passage 31 has a radial boundary of an inner tube inner wall 32, and the inner tube inner wall 32 is smooth and has a uniform diameter from the inner tube flow passage inlet 31a to the inner tube flow passage outlet 31 b.

The inner-tube flow passage 31 connects the inlet flow passage 41 and the outlet flow passage 51. One end of the inner pipe 3 is connected to the inlet flange 4, specifically, as shown in fig. 1 and 3, the inner pipe 3 is axially continuous with the inlet flange 4, and the opening at the inlet 31a of the inner pipe flow passage is welded to the side wall of the inlet flange 4 at the outlet 41b of the inlet flow passage. The other end of the inner tube 3 is suspended, and the suspended end has a radial gap 6 with the inner wall 53 of the outlet flange and an axial gap 7 with the limiting ring 52 of the outlet flange, specifically, the suspended end of the inner tube 3 is the end where the inner tube flow passage outlet 31b is located, the outer wall 33 of the inner tube at the inner tube flow passage outlet 31b has a radial gap 6 with the inner wall 53 of the outlet flange, and the opening edge at the inner tube flow passage outlet 31b has an axial gap 7 with the side wall 52b of the limiting ring, as shown in fig. 2. The limiting ring 52 is provided with an inclined limiting ring side wall 52b at one side facing the suspension end of the inner pipe 3, so that after the suspension end of the inner pipe 3 contacts the limiting ring side wall 52b, the suspension end of the inner pipe 3 can further slide on the limiting ring side wall 52b in a small range, and when an external pipeline connected at two ends of the expansion joint 1 requires a large axial compression compensation amount, the inclined limiting ring side wall 52b is favorable for further expanding the axial compression compensation amount to meet the compensation requirement of the external pipeline, and meanwhile, compared with the form of directly increasing the axial gap 7, the degree of disturbance of the axial compression compensation amount to the air flow through the inclined limiting ring side wall 52b is smaller.

Further, import flange inner wall 42, inner tube inner wall 32 and spacing ring inner wall 52a have the same diameter and the coincidence of the central axis, this makes joining department of inlet runner 41 and inner tube runner 31 smooth-going, make this section runner inner wall smooth and the internal diameter homogeneous, stable flow area has, the smoothness of joining department of inner tube runner 31 and outlet runner 51 has been promoted simultaneously, make the flow area of this section runner comparatively homogeneous, this is favorable to reducing the boundary layer extension, avoid the air current disturbance, thereby guarantee good air inlet and outlet flow field quality, satisfy the test requirement.

The inner wall 22 of the flexible outer pipe and the outer wall 33 of the inner pipe have a radial gap 6, and as mentioned above, the outer wall 33 of the inner pipe 3 at the outlet 31b of the inner pipe flow passage and the inner wall 53 of the outlet flange have a radial gap 6, which enables the expansion joint 1 to have a function of radial fine adjustment, when the air inlet and exhaust pipeline connected with the inlet flange 4 is radially stretched, the radial gap 6 of the inner pipe 3 allows the outlet flange 5 and the flexible outer pipe 2 to radially move relative to the inner pipe 3, and the flexible outer pipe 2 compensates the radial stretching of the air inlet and exhaust pipeline through the flexible stretching of the flexible outer pipe, so as to avoid the stress concentration of the air inlet and exhaust pipeline.

The expansion joint 1 has the function of axial expansion, when the temperature of air intake and exhaust or the axial force of the air intake and exhaust pipeline changes, the air intake and exhaust pipeline connected with the inlet flange 4 generates axial expansion, the outlet flange 5 and the flexible outer pipe 2 are allowed to move axially relative to the inner pipe 3, the flexible outer pipe 2 compensates the axial expansion of the air intake and exhaust pipeline through the flexible expansion, and the stress concentration of the air intake and exhaust pipeline is avoided. Specifically, when the expansion joint 1 is forced to stretch, the flexible outer tube 2 is axially stretched within its stretch limit without being constrained by the inner tube 3, and when the expansion joint 1 is forced to compress, the flexible outer tube 2 is axially compressed, and the opening at the inner tube flow passage outlet 31b allows axial compression of the flexible outer tube 2 along the axial gap 7 with the stop collar side wall 52b while limiting the maximum compression limit of the flexible outer tube 2.

In the full envelope range test of the aero-engine, an appropriate expansion joint 1 is selected according to the sizes and the spaces of air inlet and outlet pipelines of different aero-engine test beds, an inlet and an outlet of the expansion joint 1 need to be strictly confirmed when the expansion joint 1 is installed, the expansion joint cannot be installed reversely, when the expansion joint 1 is used for air inlet, the inlet of the expansion joint 1 is connected with the air inlet pipeline of the test bed, the outlet of the expansion joint 1 is connected with an aero-engine air inlet channel, thermal displacement or thermal deformation of the air inlet pipeline caused by thermal stress is counteracted in the test process, and meanwhile, a smooth flow channel of the expansion joint can meet the requirements of the test on the quality of an air inlet flow field. It will be appreciated by those skilled in the art that the expansion joint described in the present invention can be used not only in full-envelope testing of aircraft engines, but also in other heat pipes.

Example two

The second embodiment follows the reference numerals and parts of the contents of the first embodiment, wherein the same reference numerals are used to indicate the same or similar elements, and the descriptions of the same technical contents are optionally omitted. For the description of the omitted parts, reference may be made to the first embodiment, and details of the second embodiment are not repeated.

Fig. 4 is a partial schematic view of the expansion joint of the second embodiment at the inlet flange 4. As shown in fig. 4, the inlet flange 4 is sleeved on the outer wall 33 of the inner tube 3, the inlet 31a of the inner tube flow passage of the inner tube 3 is flush with the opening edge of the convex step surface 8 of the inlet flange 4, the inner wall 42 of the inlet flange 4 is attached to the outer wall 33 of the inner tube, the inlet flange 4 no longer provides the inlet flow passage 41, the inner wall 32 of the inner tube 3 defines a flow passage with a smooth and uniform diameter, and the inner wall 52a of the retainer ring and the inner wall 32 of the inner tube have the same diameter and coincide with each other with the central axis. In the first embodiment, the smooth connection between the inlet channel 41 and the inner tube channel 31 depends on the complete accuracy of the connection between the inner tube 3 and the inlet flange 4, which puts high requirements on the connection process between the inner tube 3 and the inlet flange 4. In the second embodiment, the inlet flange 4 does not provide the inlet flow passage 41, and the inlet flow passage 41 is replaced by the inner pipe flow passage 31, thereby reducing the requirement for processing.

Although the present invention has been described with reference to the above embodiments, it is not intended to limit the present invention, and those skilled in the art may make variations and modifications without departing from the spirit and scope of the present invention.

Claims (6)

1. An expansion joint adapted to be connected at both ends to adjacent external pipelines, respectively, wherein the expansion joint comprises a flexible outer pipe, an inner pipe, an inlet flange and an outlet flange;

the inlet flange is connected with the outlet flange through the flexible outer pipe, the inner wall of the outlet flange protrudes inwards to form a limiting ring, and a radial gap is formed between the inner wall of the flexible outer pipe and the outer wall of the inner pipe;

the inner tube one end is connected the import flange, the entry of import flange with inject smooth and the even runner of internal diameter between the export of inner tube, other end suspension, the other end of suspension with the inner wall of export flange has radial clearance, and with the spacing ring has axial clearance, the spacing ring with the coaxial setting of runner and have with the internal diameter that the runner is the same.

2. The expansion joint of claim 1, wherein the inner tube is axially continuous with the inlet flange, an inner wall of the inlet flange and an inner wall of the inner tube collectively defining the flow passage.

3. The expansion joint of claim 1, wherein the inlet flange is disposed about an outer wall of the inner tube, the inner wall of the inner tube defining the flow passage.

4. An expansion joint according to claim 1, wherein the side of the stop ring towards the other end has a sloped stop ring side wall.

5. The expansion joint of claim 1, wherein the inlet flange and the outlet flange have stepped surfaces for alignment of the external conduits.

6. An expansion joint according to claim 1, wherein the flexible outer tube is a bellows.

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