Fixture for testing air tightness of piston ring

Abstract

The utility model relates to an air tightness test fixture for a piston ring, which is suitable for performance test of the piston ring for an aero-engine and comprises a positioning sleeve, a mounting shaft and a cover plate, one end of the positioning sleeve is open, the positioning sleeve is of a hollow structure, and the mounting shaft and the cover plate are arranged in a gradually changing structure in the vertical direction. The hose connector is communicated with an external gas supply device, and pressure gas can be filled into the positioning sleeve through the hose connector; the mounting shaft is mounted on the inner bottom surface of the positioning sleeve in an air-tight sealing manner, a mounting groove is formed in the outer circumference of the top end of the mounting shaft, and the mounting groove is used for placing the piston ring to realize the contact sealing with the inner wall of the positioning sleeve; the cover plate covers the positioning sleeve in an air-tight sealing mode, a welded straight joint is arranged on the cover plate, the straight joint is communicated with an external measuring device, the measuring device can measure the leakage amount of pressure gas in the positioning sleeve, and the testing efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of piston ring testing components, and particularly relates to a piston ring airtightness testing fixture. Background Technique

[0002] Piston ring sealing is to place an open elastic ring into a groove and use the tightening property of the piston ring's own structure for sealing. Currently, most static seal test devices are used for the piston ring sealing test, and the maximum deformation of the piston ring during the test is judged by visual observation or using measuring tools to measure whether it is qualified. This method reduces the sealing test efficiency of the piston ring. Content of the Utility Model

[0003] In view of this, the piston ring airtightness testing fixture of the utility model can improve the test efficiency of the piston ring airtightness performance.

[0004] A piston ring airtightness testing fixture, which is applicable to the performance test of piston rings for aero-engines, includes a positioning sleeve with one end open and a hollow structure, an installation shaft arranged in a gradually changing structure in the vertical direction, and a cover plate. Among them,

[0005] A hose connector is installed on the bottom surface of the positioning sleeve, and the hose connector is communicated with an external air supply device. Through the hose connector, pressurized gas can be filled into the positioning sleeve;

[0006] The installation shaft is installed on the inner bottom surface of the positioning sleeve in an airtight manner, and an installation groove is arranged on the outer circumference of the top end for placing the piston ring to achieve sealing in contact with the inner wall of the positioning sleeve;

[0007] The cover plate covers the positioning sleeve in an airtight manner, and a welded straight-through joint is arranged on the cover plate. The straight-through joint is communicated with an external measuring device, and the measuring device can measure the leakage amount of the pressurized gas in the positioning sleeve.

[0008] Preferably, the gap or clearance between the outer side surface of the top of the installation shaft and the inner wall surface of the positioning sleeve meets a preset value.

[0009] Preferably, a ring ear is arranged on the outer shaft of the top surface of the positioning sleeve, a first sealing groove is arranged on the top surface of the ring ear, a first sealing ring is installed in the first sealing groove, the first sealing ring is used for airtight sealing between the positioning sleeve and the cover plate, and the cover plate is fixedly connected with the ring ear through a bolt assembly.

[0010] Preferably, the installation shaft includes a first horizontal part, an inclined part, and a second horizontal part arranged in an integrated structure. Among them,

[0011] An installation groove is provided on the outer circumferential surface of the second horizontal portion, and its height in the vertical direction is greater than that of the first horizontal portion in the vertical direction. A preset distance gap or slit is left between the outer side surface of the second horizontal portion and the inner wall surface of the positioning sleeve;

[0012] A first protrusion is provided in the central area of the first horizontal portion, and a second protrusion is provided in the central area of the positioning sleeve. An installation hole is provided in the second protrusion, and the first protrusion is installed in the installation hole through a sealing screw assembly;

[0013] The first horizontal portion is installed on the inner bottom surface of the positioning sleeve in an airtight manner.

[0014] Preferably, a second sealing groove is provided on the inner bottom surface of the positioning sleeve near the inclined portion. The second sealing groove is used for installing a second sealing ring, and the second sealing ring is used for airtight sealing between the first horizontal portion and the positioning sleeve.

[0015] Preferably, the preset distance is less than or equal to 1 cm.

[0016] Beneficial effects

[0017] This structure replaces the traditional semi-manual measurement method with an intelligent measurement method, which not only improves the measurement accuracy of the piston ring, but also improves the test efficiency of the piston ring, shortens the time-consuming and saves manpower. Brief description of the drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a three-dimensional view of the present utility model;

[0020] Figure 2 is a front view cross-sectional view of the present utility model, where,

[0021] 1. lifting ring; 2. straight-through joint; 3. mounting shaft; 4. positioning sleeve; 6. cover plate; 7. hose joint; 31. installation groove; 32. first horizontal portion; 33. inclined portion; 34. second horizontal portion; 321. first protrusion; 41. second protrusion; 42. ring ear; 43. first sealing groove; 44. second sealing groove. Detailed description of the specific embodiments

[0022] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0023] The following describes the embodiments of the present disclosure through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0024] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. Additionally, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0025] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present disclosure schematically, and only show the components related to the present disclosure, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in its actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0026] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the aspects can be practiced without these specific details.

[0027] As Figures 1 to 2 shown in the piston ring airtightness test fixture, it is applicable to the performance test of piston rings for aero-engines. The piston rings are, for example, sealing piston rings, oil-hanging piston rings, oil-blocking piston rings, or others. Generally, the piston rings are made of metal materials. It includes a positioning sleeve 4 with an open end and a hollow structure, an installation shaft 3 arranged in a gradually changing structure in the vertical direction, and a cover plate 6. Among them,

[0028] A hose joint 7 is installed on the bottom surface of the positioning sleeve 4. The hose joint 7 is connected to an external air supply device, and pressurized gas can be filled into the positioning sleeve 4 through the hose joint 7;

[0029] The mounting shaft 3 is mounted on the inner bottom surface of the positioning sleeve 4 in a gas-tight manner, and an installation groove 31 is provided on the outer circumference of the top end. The installation groove 31 is used for placing the packing ring to achieve sealing in contact with the inner wall of the positioning sleeve 4;

[0030] The cover plate 6 covers the positioning sleeve 4 in a gas-tight manner, and a welded straight-through joint 2 is provided on the cover plate 6. The straight-through joint 2 is communicated with an external measuring device, and the measuring device can measure the leakage amount of the pressurized gas in the positioning sleeve 4. Preferably, a lifting ring 1 is provided on the top surface of the cover plate 6, and the lifting ring 1 is used for hoisting or installing the cover plate 6.

[0031] Furthermore, the gap or clearance between the outer side surface of the top of the mounting shaft 3 and the inner wall surface of the positioning sleeve 4 meets a preset value. For example, it is less than 1 cm. Generally, after the packing ring is installed in the installation groove 31, the packing ring can be tightened, and the gas-tight seal between the positioning sleeve 4 and the mounting shaft 3 is achieved through the packing ring. The leakage amount of the straight-through joint 2 is measured by the measuring device to test the sealing performance of the packing ring. For example, if the design allowable value of a certain model of packing ring is less than 0.2 cubic meters, then the gas supply amount of the hose joint 7 is 1 cubic meter, and the gas-tight seal performance detection time is 1 h. It is only judged whether the leakage amount detected by the measuring device within 1 h is less than 0.2 cubic meters. If so, the performance of the packing ring meets the standard; if not, it is a substandard product.

[0032] As a specific embodiment provided in this case, an annular ear 42 is provided on the outer shaft of the top surface of the positioning sleeve 4, a first sealing groove 43 is provided on the top surface of the annular ear 42, and a first sealing ring is installed in the first sealing groove 43. The first sealing ring is used for gas-tight seal between the positioning sleeve 4 and the cover plate 6. The cover plate 6 is fixedly connected to the annular ear 42 through a bolt assembly. For example, the first sealing groove 43 is arranged adjacent to the inner wall of the positioning sleeve 4. Preferably, the mounting shaft 3 includes a first horizontal portion 32, an inclined portion 33, and a second horizontal portion 34 which are integrally structured. The included angle between the inclined portion 33 and the horizontal plane is 130° - 150°. The overall height of the mounting shaft 3 is less than the height of the positioning sleeve 4, and the overall mounting shaft 3 is in an inclined Z shape. Among them,

[0033] The installation groove 31 is provided on the outer circumferential surface of the second horizontal portion 34, and the height in the vertical direction is greater than the height of the first horizontal portion 32 in the vertical direction. And there is a gap or clearance with a preset distance between the outer side surface of the second horizontal portion 34 and the inner wall surface of the positioning sleeve 4, and the preset distance is less than or equal to 1 cm;

[0034] A first protrusion 321 is provided in the central region of the first horizontal portion 32, and a second protrusion 41 is provided in the central region of the positioning sleeve 4. The second protrusion 41 is provided with an installation hole, and the first protrusion 321 is installed in the installation hole through a sealing screw assembly;

[0035] The first horizontal portion 32 is mounted on the inner bottom surface of the positioning sleeve 4 in an airtight manner. For example, a second sealing groove 44 is provided on the inner bottom surface of the positioning sleeve 4 at a position adjacent to the inclined portion 33. The second sealing groove 44 is used for installing a second sealing ring, which is used for airtight sealing between the first horizontal portion 32 and the positioning sleeve 4.

[0036] It should be pointed out that the purpose of providing the inclined portion 33 on the mounting shaft 3 is to facilitate the installation of the expansion ring on the second horizontal portion 34. If the inclined portion 33 is not provided, the expansion ring will easily detach from the mounting shaft 3 during the assembly process. The first sealing ring and the second sealing ring are both O-rings.

[0037] Furthermore, an intelligent detection system is provided, including a controller, which stores the allowable leakage values of different types of expansion rings. The controller is communicatively connected to the air supply device and the measuring device respectively. The measuring device, for example, an intelligent pressure gauge, feeds back the leakage value within the standard measurement time. If the value fed back at a certain moment is greater than the allowable leakage value, the test is completed, indicating that the performance of the expansion ring is unqualified, and it is marked.

[0038] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A piston ring airtightness test fixture, applicable to the performance test of piston rings for aero-engines, characterized in that, It includes a positioning sleeve with one end open and a hollow structure, an installation shaft arranged in a gradually changing structure in the vertical direction, and a cover plate. Among them, A hose connector is installed on the bottom surface of the positioning sleeve. The hose connector is communicated with an external air supply device, and pressurized gas can be filled into the positioning sleeve through the hose connector. The installation shaft is installed on the inner bottom surface of the positioning sleeve in an airtight manner, and an installation groove is arranged on the outer circumference of the top end for placing the packing ring to achieve sealing in contact with the inner wall of the positioning sleeve. The cover plate covers the positioning sleeve in an airtight manner, and a welded straight-through joint is arranged on the cover plate. The straight-through joint is communicated with an external measuring device, and the measuring device can measure the leakage amount of the pressurized gas in the positioning sleeve.

2. The piston ring airtightness test fixture according to claim 1, characterized in that The gap or clearance between the outer side surface of the top of the installation shaft and the inner wall surface of the positioning sleeve meets a preset value.

3. The piston ring airtightness test fixture according to claim 1, wherein, An annular ear is arranged on the outer shaft of the top surface of the positioning sleeve. A first sealing groove is arranged on the top surface of the annular ear, and a first sealing ring is installed in the first sealing groove. The first sealing ring is used for airtight sealing between the positioning sleeve and the cover plate, and the cover plate is fixedly connected to the annular ear through a bolt assembly.

4. The piston ring airtightness test fixture according to claim 3, wherein The installation shaft includes a first horizontal part, an inclined part, and a second horizontal part arranged in an integrated structure. Among them, The installation groove is arranged on the outer circumferential surface of the second horizontal part, and its height in the vertical direction is greater than the height of the first horizontal part in the vertical direction. And there is a gap or clearance with a preset distance between the outer side surface of the second horizontal part and the inner wall surface of the positioning sleeve. A first protrusion is arranged in the central area of the first horizontal part, and a second protrusion is arranged in the central area of the positioning sleeve. An installation hole is arranged in the second protrusion, and the first protrusion is installed in the installation hole through a sealing screw assembly. The first horizontal part is installed on the inner bottom surface of the positioning sleeve in an airtight manner.

5. The piston ring airtightness test fixture according to claim 4, characterized in that, A second sealing groove is arranged on the inner bottom surface of the positioning sleeve near the inclined part. The second sealing groove is used for installing a second sealing ring, and the second sealing ring is used for airtight sealing between the first horizontal part and the positioning sleeve.

6. The ring seal airtightness test fixture according to claim 5, wherein, The preset distance is less than or equal to 1 cm.

7. The piston ring airtightness test fixture according to claim 5, wherein It also includes a controller, and the controller is respectively communicatively connected with the air supply device and the measuring device.

8. The piston ring airtightness test fixture according to claim 1, characterized in that, A lifting ring is arranged on the top surface of the cover plate, and the lifting ring is used for hoisting the cover plate.

9. The piston ring airtightness test fixture according to claim 1, characterized in that The packing ring is a sealing packing ring or an oil-hanging packing ring or an oil-blocking packing ring.

10. The piston ring airtightness test fixture according to claim 1, characterized in that, The packing ring is made of metal material.

Images