Filter paper clamping mechanism

Abstract

The utility model discloses a filter paper clamping mechanism. The filter paper clamping mechanism comprises a first connector, a second connector, a sealing ring and a fastener. The first end of the first connector is connected with a first pipeline. The first end of the second connector is connected with a second pipeline. In the working state, the second end of the first connector and the second end of the second connector extrude the sealing ring from the two axial sides of the sealing ring and are in butt joint with each other, so that the first connector, the second connector and the sealing ring jointly form a sealed cylindrical cavity. The filter paper is selectively clamped between the sealing ring and the second end of the first connector or between the sealing ring and the second end of the second connector. The fastener is used for applying fastening force after the first connector, the second connector and the sealing ring are assembled so as to prevent the first connector, the second connector and the sealing ring from being separated. The assembly process of the filter paper clamping mechanism is optimized, the scheme for fixing the filter paper is simplified, the requirement for frequent disassembly and assembly in the aero-engine pollutant emission monitoring process is met, and the filter paper replacement convenience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of aviation engine pollutant emission monitoring, and in particular to a filter paper clamping mechanism. Background Art

[0002] In the detection of smoke particles emitted by aircraft engine pollutants, the filter paper needs to use a filter paper clamp to fix itself and seal the sampling section when filtering smoke particles. The existing filter paper clamp uses two "trumpet" shaped metal covers and uses four bolts for fastening and sealing. The installation and disassembly operations of this structure are complicated and the sampling filter paper is easily contaminated during operation.

[0003] It should be noted that the statements in this background technology section only provide background technology related to the present application and do not necessarily constitute prior art. Utility Model Content

[0004] The present application provides a filter paper clamping mechanism to improve the convenience of replacing filter paper during the monitoring of aircraft engine pollutant emissions.

[0005] The present application provides a filter paper clamping mechanism, the filter paper is used for monitoring the emission of pollutants from aircraft engines, and includes a first joint, a second joint, a sealing ring and a fastener. The first end of the first joint is used to connect the first pipeline. The first end of the second joint is used to connect the second pipeline. The filter paper clamping mechanism has a working state. In the working state, the second end of the first joint and the second end of the second joint squeeze the sealing ring from both axial sides of the sealing ring and dock with each other, so that the first joint, the second joint and the sealing ring together constitute a sealed cylindrical cavity for the exhaust gas of the aircraft engine to flow in the first pipeline and the second pipeline and pass through the cylindrical cavity during the flow process. The filter paper can be selectively clamped between the sealing ring and the second end of the first joint or the second end of the second joint. The fastener is used to apply a tightening force after the first joint, the second joint and the sealing ring are assembled to prevent the first joint, the second joint and the sealing ring from separating.

[0006] In some embodiments, the first joint includes a first barrel and a first annular flange, and the first barrel extends in an axial direction. The first end of the first barrel is used to connect the first pipeline. The first annular flange is arranged at the second end of the first barrel and extends radially outward from the first barrel. The second joint includes a second barrel and a second annular flange. The second barrel extends in an axial direction. The first end of the second barrel is used to connect the first pipeline. The second annular flange is arranged at the second end of the second barrel and extends radially outward from the second barrel. The first annular flange is used to dock with the second annular flange. In the working state, the exhaust gas flows through the cylindrical cavity in the axial direction and passes through the filter paper during the flow.

[0007] In some embodiments, the fastener has an annular inner wall and an annular groove disposed on the annular inner wall, and the annular groove is adapted to the shape of the first annular convex edge and the second annular convex edge. In the working state, the annular groove forms a concave-convex fit with the first annular convex edge and the second annular convex edge to prevent the first joint, the second joint and the sealing ring from separating at least in the axial direction.

[0008] In some embodiments, the fastener comprises a clamp, wherein the inner wall of the clamp is used to form an annular inner wall, and the annular groove is arranged on the inner wall of the clamp.

[0009] In some embodiments, the clamp includes a first clamp ring, a second clamp ring, and a connecting piece. The first end of the first clamp ring is rotatably connected to the first end of the second clamp ring. The connecting piece is used to connect the second end of the first clamp ring to the second end of the second clamp ring, so that the first clamp ring and the second clamp ring form an annular inner wall.

[0010] In some embodiments, the clamp further includes a locking member, which is used to lock the second end of the first clamp ring and the second end of the second clamp ring in a working state.

[0011] In some embodiments, the locking member is further configured to apply a force in a working state to prevent the second end of the first snap ring from separating from the second end of the second snap ring, so that the annular groove presses the first annular protrusion and the second annular protrusion in the entire circumferential direction.

[0012] In some embodiments, the connecting member includes a threaded rod, and the locking member includes a nut, which is threadedly connected to the threaded rod to prevent the second end of the first clamping ring from being separated from the second end of the second clamping ring.

[0013] In some embodiments, the diameters of the first annular flange, the second annular flange, and the sealing ring are the same.

[0014] In some embodiments, the first joint is tapered from the second end of the first joint to the first end of the first joint, and / or the second joint is tapered from the second end of the second joint to the first end of the second joint.

[0015] In some embodiments, at least one of the first joint and the second joint is made of an elastic material, and in a working state, at least one of the first joint and the second joint is deformed under the action of the fastener.

[0016] Based on the technical solution provided by the present application, the filter paper clamping mechanism includes a first joint, a second joint, a sealing ring and a fastener. The first end of the first joint is used to connect the first pipeline. The first end of the second joint is used to connect the second pipeline. The filter paper clamping mechanism has a working state, in which the second end of the first joint and the second end of the second joint squeeze the sealing ring from both axial sides of the sealing ring and dock with each other, so that the first joint, the second joint and the sealing ring together constitute a sealed cylindrical cavity for the exhaust gas of the aircraft engine to flow in the first pipeline and the second pipeline and pass through the cylindrical cavity during the flow process. The filter paper can be selectively clamped between the sealing ring and the second end of the first joint or the second end of the second joint. The fastener is used to apply a tightening force after the first joint, the second joint and the sealing ring are assembled to prevent the first joint, the second joint and the sealing ring from separating. The assembly process of the filter paper clamping mechanism is optimized, and the scheme for fixing the filter paper is also simplified, so that the filter paper clamping mechanism has a simple structure, is easy to assemble and disassemble, meets the needs of frequent disassembly and installation requirements during the monitoring of aircraft engine pollutant emissions, and improves the convenience of replacing filter paper.

[0017] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 Schematic diagram of the disassembly of the filter paper clamping mechanism of some embodiments of the present application.

[0020] Figure 2 Schematic diagram of filter paper clamping mechanism according to some other embodiments of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0024] In the prior art, the filter paper clip has a complex structure, is difficult to disassemble and install, and is easy to contaminate the sampling filter paper during the disassembly process. There are also problems such as difficulty in installation and disassembly due to the non-concentricity of the pipeline.

[0025] To solve the above problems, refer to Figure 1The present application provides a filter paper clamping mechanism, the filter paper is used for monitoring the emission of pollutants from aircraft engines, and includes a first joint 2, a second joint 3, a sealing ring 4 and a fastener. The first end of the first joint 2 is used to connect the first pipeline. The first end of the second joint 3 is used to connect the second pipeline. The filter paper clamping mechanism has a working state, in which the second end of the first joint 2 and the second end of the second joint 3 squeeze the sealing ring 4 from both axial sides of the sealing ring 4 and dock with each other, so that the first joint 2, the second joint 3 and the sealing ring 4 together constitute a sealed cylindrical cavity for the exhaust gas of the aircraft engine to flow in the first pipeline and the second pipeline and pass through the cylindrical cavity during the flow. The filter paper can be selectively clamped between the sealing ring 4 and the second end of the first joint 2 or the second end of the second joint 3. The fastener is used to apply a tightening force after the first joint 2, the second joint 3 and the sealing ring 4 are assembled to prevent the first joint 2, the second joint 3 and the sealing ring 4 from separating.

[0026] Specifically, in the process of docking the two joints, the filter paper is fixed, the assembly process of the filter paper clamping mechanism is optimized, and the scheme for fixing the filter paper is simplified, so that the filter paper clamping mechanism has a simple structure and is easy to assemble and disassemble, meeting the needs of frequent disassembly and installation requirements during aircraft engine pollutant emission monitoring, and improving the convenience of replacing filter paper.

[0027] In some embodiments, the first joint 2 includes a first barrel 21 and a first annular flange 22. The first barrel 21 extends in the axial direction X. The first end of the first barrel 21 is used to connect the first pipeline. The first annular flange 22 is arranged at the second end of the first barrel 21 and extends radially outward from the first barrel 21. The second joint 3 includes a second barrel 31 and a second annular flange 32. The second barrel 31 extends in the axial direction X. The first end of the second barrel 31 is used to connect the first pipeline. The second annular flange 32 is arranged at the second end of the second barrel 31 and extends radially outward from the second barrel 31. The first annular flange 22 is used to dock with the second annular flange 32. In the working state, the exhaust gas flows through the cylindrical cavity in the axial direction X and passes through the filter paper during the flow process. The first annular flange 22 and the second annular flange 32 cooperate to increase the contact area when the sealing ring 4 is squeezed, and the sealing is increased, so that the exhaust gas of the aircraft engine passes through the filter paper as much as possible, so that the particulate matter in the exhaust gas is filtered.

[0028] In some embodiments, the fastener has an annular inner wall and an annular groove arranged on the annular inner wall. The annular groove is adapted to the shape of the first annular flange 22 and the second annular flange 32. In the working state, the annular groove forms a concave-convex fit with the first annular flange 22 and the second annular flange 32 to prevent the first joint 2, the second joint 3 and the sealing ring 4 from separating at least in the axial direction X. The addition of the annular groove can position the first annular flange 22 and the second annular flange 32 with the annular groove during assembly, thereby improving the ease of assembly. And after the assembly is completed, the annular groove plays a role in preventing the first joint 2, the second joint 3 and the sealing ring 4 from loosening or separating in the axial direction X in the axial direction X, thereby improving the stability of the aircraft engine pollutant emission monitoring process.

[0029] In some embodiments, the fastener includes a clamp. The inner wall of the clamp is used to form an annular inner wall, and the annular groove is arranged on the inner wall of the clamp. The clamp structure is simple and light, and the manufacturing cost of the filter paper clamping mechanism can be reduced. On the other hand, the clamp can compensate for the angular deviation or axial displacement caused by the non-concentric installation of the pipelines on both sides, and can also withstand greater pressure, higher bending and tensile composite loads and dynamic pulse loads.

[0030] In some embodiments, the clamp includes a first clamp ring 11, a second clamp ring 12 and a connector 13. The first end of the first clamp ring 11 is rotatably connected to the first end of the second clamp ring 12. The connector 13 is used to connect the second end of the first clamp ring 11 to the second end of the second clamp ring 12, so that the first clamp ring 11 and the second clamp ring 12 form an annular inner wall. Specifically, the first clamp ring 11 and the second clamp ring 12 are both semicircular arc components, and the inner walls of the first clamp ring 11 and the second clamp ring 12 are both provided with semicircular arc grooves. After the second end of the first clamp ring 11 is connected to the second end of the second clamp ring 12, the two semicircular arc grooves form the above-mentioned annular grooves, so as to fit with the first annular convex edge 22 and the second annular convex edge 32 in the circumferential direction, thereby increasing the fastening effect. The connector 13 can make the first clamp ring 11 and the second clamp ring 12 relatively fixed after the second end of the first clamp ring 11 is connected to the second end of the second clamp ring 12, thereby improving the stability of the filter paper clamping mechanism and reducing accidents during the test. In order to further improve the stability of the filter paper clamping mechanism in the working state, in some embodiments, the clamp further includes a locking member 14. The locking member 14 is used to lock the second end of the first clamp ring 11 and the second end of the second clamp ring 12 in the working state.

[0031] In some embodiments, the locking member 14 is further configured to apply a force that prevents the second end of the first snap ring 11 from separating from the second end of the second snap ring 12 in the working state, so that the annular groove squeezes the first annular flange 22 and the second annular flange 32 in the entire circumferential direction. In this way, the first annular flange 22 and the second annular flange 32 can be subjected to a radially inward squeezing effect in the circumferential direction in addition to being limited in the axial direction, which can further improve the stability in the working state, reduce the risk of relative looseness between the first joint 2, the second joint 3 and the sealing ring 4, ensure the sealing during the test process, and thus improve the stability of the test process and the accuracy of the test results.

[0032] In some embodiments, the connector 13 includes a threaded rod. The locking member 14 includes a nut. The nut is threadedly connected to the threaded rod to prevent the second end of the first snap ring 11 from being separated from the second end of the second snap ring 12. Specifically, the second end of the first snap ring 11 and the second end of the second snap ring 12 are respectively provided with through holes for stringing the threaded rod. After the first joint 2 and the second joint 3 are docked, the first snap ring 11 is rotated relative to the second snap ring 12 until the second end of the first snap ring 11 is aligned with the second end of the second snap ring 12. At this time, the two through holes are aligned, which is convenient for installing the threaded rod. Further, by tightening the nut, the assembly can be completed. The cost can be effectively reduced and the ease of disassembly can be improved.

[0033] In some embodiments, the nut may be provided with a force applying portion for facilitating the staff to apply force for tightening. The contour of the force applying portion is configured to be a regular or irregular shape, as long as it is convenient for the staff to apply force.

[0034] In some embodiments, the diameters of the first annular flange 22, the second annular flange 32 and the sealing ring 4 are the same. This can improve the sealing performance. Of course, the diameter of the sealing ring 4 can also be set larger than the first annular flange 22 and the second annular flange 32. During assembly, the sealing ring 4 is deformed by the axial extrusion of the first joint 2 and the second joint 3 and the circumferential extrusion of the clamp, which can further improve the sealing performance.

[0035] In some embodiments, the first joint 2 is tapered from the second end of the first joint 2 to the first end of the first joint 2, and / or the second joint 3 is tapered from the second end of the second joint 3 to the first end of the second joint 3. Figure 2 The second barrel 31 of the second connector 3 is configured to be tapered in its extension direction, so that the diameter of the first end of the second barrel 31 is adapted to the diameter of the pipeline to be connected, so that the second connector 3 is conveniently connected to the pipeline. Similarly, the first connector 2 can also be configured to be tapered to facilitate the connection of the first connector 2 to the pipeline.

[0036] It is worth noting that in Figure 2 In the embodiment shown, the structure and Figure 1 The structures of the filter paper clamping mechanisms shown are generally the same, except that Figure 2 The second cylinder 31 in the embodiment is of a constricted form. Figure 1 In the filter paper clamping mechanism shown in FIG. 1 , the second end of the first joint 2 and the second end of the second joint 3 squeeze the sealing ring 4 from both axial sides of the sealing ring 4 and butt against each other. Figure 2 After docking, the sealing ring 4 is sandwiched between the first annular flange 22 and the second annular flange 32. Figure 2 In the assembly state shown, the first snap ring 11 has been matched with the first annular flange 22 and the second annular flange 32. Subsequently, it is only necessary to rotate the second snap ring 12 relative to the first snap ring 11 so that the second snap ring 12 matches with the remaining parts of the first annular flange 22 and the second annular flange 32, and lock the second end of the first snap ring 11 with the second end of the second snap ring 12.

[0037] In some embodiments, at least one of the first joint 2 and the second joint 3 is made of an elastic material. In the working state, at least one of the first joint 2 and the second joint 3 is deformed under the action of the fastener. On the basis of the above embodiment, at least one of the first joint 2 and the second joint 3 can also be deformed during the assembly process, so that a better sealing effect can be achieved.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present application, which should be included in the scope of the technical solution for protection in the present application.

Claims

1. A filter paper clamping mechanism, wherein the filter paper is used for monitoring the emission of pollutants from aircraft engines, characterized in that: include: A first connector (2), wherein a first end of the first connector (2) is used for connecting to a first pipeline; A second connector (3), a first end of the second connector (3) being used for connecting to a second pipeline; The filter paper clamping mechanism has a working state, in which the second end of the first joint (2) and the second end of the second joint (3) squeeze the seal ring (4) from both axial sides of the seal ring (4) and butt against each other, so that the first joint (2), the second joint (3) and the seal ring (4) together form a sealed cylindrical cavity, allowing the exhaust gas of the aircraft engine to flow in the first pipeline and the second pipeline and pass through the cylindrical cavity during the flow, and the filter paper can be selectively clamped between the seal ring (4) and the second end of the first joint (2) or the second end of the second joint (3); as well as A fastener is used to apply a fastening force after the first joint (2), the second joint (3) and the sealing ring (4) are assembled, so as to prevent the first joint (2), the second joint (3) and the sealing ring (4) from separating.

2. The filter paper clamping mechanism according to claim 1, characterized in that: The first joint (2) comprises a first cylinder (21) and a first annular convex edge (22), the first cylinder (21) extending in an axial direction (X), the first end of the first cylinder (21) being used for connecting to the first pipeline, the first annular convex edge (22) being arranged at the second end of the first cylinder (21) and extending radially outwardly of the first cylinder (21), the second joint (3) comprising a second cylinder (31) and a second annular convex edge (32), the second cylinder (31) extending in an axial direction (X), the first end of the second cylinder (31) being used for connecting to the first pipeline, the second annular convex edge (32) being arranged at the second end of the second cylinder (31) and extending radially outwardly of the second cylinder (31), the first annular convex edge (22) being used for docking with the second annular convex edge (32), and in the working state, the exhaust gas flows through the cylindrical cavity along the axial direction (X) and passes through the filter paper during the flow process.

3. The filter paper clamping mechanism according to claim 2, characterized in that: The fastener comprises an annular inner wall and an annular groove arranged on the annular inner wall, the annular groove is adapted in shape to the first annular convex edge (22) and the second annular convex edge (32), and in the working state, the annular groove forms a concave-convex fit with the first annular convex edge (22) and the second annular convex edge (32) to prevent the first joint (2), the second joint (3) and the sealing ring (4) from being separated at least in the axial direction (X).

4. The filter paper clamping mechanism according to claim 3, characterized in that: The fastener comprises a clamp, the inner wall of the clamp is used to form the annular inner wall, and the annular groove is arranged on the inner wall of the clamp.

5. The filter paper clamping mechanism according to claim 4, characterized in that: The clamp comprises a first clamping ring (11), a second clamping ring (12) and a connecting piece (13), wherein the first end of the first clamping ring (11) is rotatably connected to the first end of the second clamping ring (12), and the connecting piece (13) is used to connect the second end of the first clamping ring (11) to the second end of the second clamping ring (12), so that the first clamping ring (11) and the second clamping ring (12) form the annular inner wall.

6. The filter paper clamping mechanism according to claim 5, characterized in that: The clamp further comprises a locking member (14), wherein the locking member (14) is used to lock the second end of the first clamp ring (11) and the second end of the second clamp ring (12) in the working state.

7. The filter paper clamping mechanism according to claim 6, characterized in that: The locking member (14) is also configured to apply a force in the working state to prevent the second end of the first retaining ring (11) from separating from the second end of the second retaining ring (12), so that the annular groove squeezes the first annular ridge (22) and the second annular ridge (32) in the entire circumferential direction.

8. The filter paper clamping mechanism according to claim 7, characterized in that: The connecting member (13) comprises a threaded rod, and the locking member (14) comprises a nut, wherein the nut is threadedly connected to the threaded rod to prevent the second end of the first clamping ring (11) from being separated from the second end of the second clamping ring (12).

9. The filter paper clamping mechanism according to claim 2, characterized in that: The diameters of the first annular convex edge (22), the second annular convex edge (32) and the sealing ring (4) are the same.

10. The filter paper clamping mechanism according to any one of claims 1 to 9, characterized in that: The first joint (2) is configured to be tapered from the second end of the first joint (2) to the first end of the first joint (2), and / or the second joint (3) is configured to be tapered from the second end of the second joint (3) to the first end of the second joint (3).

11. The filter paper clamping mechanism according to any one of claims 1 to 9, characterized in that: At least one of the first joint (2) and the second joint (3) is made of elastic material, and in the working state, at least one of the first joint (2) and the second joint (3) is deformed under the action of the fastener.

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