Aero-engine cartridge valve test tool

Abstract

The invention provides an aero-engine cartridge valve test tool comprising a positioning unit which comprises a positioning hole, the positioning hole is communicated with an oil inlet nozzle and an oil outlet nozzle, the inner wall of the positioning hole is provided with two sealing rings to form a sealing section, and the oil inlet nozzle is arranged between the two sealing rings; the cartridge valve can be inserted into the positioning hole, the outer wall of the cartridge valve can be tightly pressed on the two sealing rings, and an oil inlet of the cartridge valve is arranged between the two sealing rings, so that the oil inlet nozzle is communicated with the oil inlet through the sealing section; the pressing unit comprises an air cylinder, a pressing arm is arranged at the end of a piston rod of the air cylinder, and the end of the pressing arm can be tightly pressed at the top end of the cartridge valve. The two sealing rings are arranged in the positioning hole, the oil inlet nozzle and the oil inlet are arranged between the two sealing rings, a medium of the oil inlet nozzle can enter the oil inlet of the cartridge valve through the sealing section, meanwhile, the air cylinder drives the pressing arm to fix the cartridge valve in the positioning hole, and the cartridge valve is prevented from loosening.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine parts testing, and in particular relates to a clamping device for cartridge valve testing. Background Technology

[0002] Cartridge valves are a fundamental component of highly integrated hydraulic systems. They have significant advantages such as large flow capacity, fast response speed, good sealing performance, and easy modular combination, and are widely used in various fields such as engineering machinery and aerospace. By installing "valve cores" with different functions in a universal valve block, the design of hydraulic systems based on cartridge valves is extremely flexible and compact.

[0003] To verify the performance of cartridge valves during design and production, tests are required on their opening and closing characteristics, sealing performance, durability, and reliability. Currently, traditional clamping test fixtures generally use a pressure plate structure. During cartridge valve testing, the cartridge valve needs to be inserted into the fixture and then secured with bolts and a pressure plate. This process is cumbersome. Furthermore, during the insertion of the cartridge valve into the fixture, the inlet and outlet ports of the cartridge valve must be aligned with the inlet and outlet ports of the test fixture, which hinders rapid operation and affects testing efficiency. Summary of the Invention

[0004] In view of this, the present invention aims to provide a test fixture for cartridge valves of aero-engines to improve the testing efficiency of cartridge valves.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A test fixture for cartridge valves of aero-engines, including

[0007] The positioning unit includes a positioning hole that communicates with an oil inlet and an oil outlet. The inner wall of the positioning hole is provided with two sealing rings to form a sealing section, and the oil inlet is positioned between the two sealing rings.

[0008] The cartridge valve can be inserted into the positioning hole, and the outer wall of the cartridge valve can be pressed tightly against the two sealing rings. The oil inlet of the cartridge valve is placed between the two sealing rings, so that the oil inlet is connected to the oil inlet through the sealing section, and the oil outlet of the cartridge valve is connected to the oil outlet.

[0009] The pressing unit includes a cylinder, and the piston rod end of the cylinder is provided with a pressing arm, the end of which can press tightly against the top of the cartridge valve.

[0010] Furthermore, the positioning hole is provided with a first step and a second step, and the platform surfaces of the first step and the second step are respectively facing the same end of the positioning hole. The two sealing rings are respectively placed on the first step and the second step. The outer wall of the cartridge valve is provided with two stepped surfaces, and the two stepped surfaces can respectively abut against the platform surfaces of the first step and the second step.

[0011] Furthermore, the positioning hole is provided with an oil outlet section, which is located at the bottom of the positioning hole. The oil outlet nozzle is connected to the oil outlet section, and the oil outlet of the cartridge valve can extend into the oil outlet section.

[0012] Furthermore, the test fixture also includes a support frame, and the positioning unit also includes a base, with the positioning hole opening on the base.

[0013] Furthermore, the test fixture also includes a fixing clip with a connecting shaft extending from one side. The connecting shaft passes through the support frame, and a locking nut is screwed to the connecting shaft, so that the fixing clip is fixed on the support frame; the base body is fixedly connected to the fixing clip.

[0014] Furthermore, the support frame and the connecting shaft have corresponding fixing holes in a direction perpendicular to the axial direction of the connecting shaft, and a positioning pin is inserted into the fixing holes of the support frame and the connecting shaft.

[0015] Furthermore, the specified function card includes two opposing tabs, and the bottom of the base extends between the two tabs.

[0016] Furthermore, the outer ends of the two plates are provided with connecting ears, and the two connecting ears are connected by bolts.

[0017] Furthermore, the cylinder is a rotary clamping cylinder, which allows the pressure arm to rotate out of the positioning hole projection range after being lifted.

[0018] Compared with existing technologies, the aero-engine cartridge valve test fixture of the present invention has the following advantages:

[0019] This invention employs two sealing rings within the positioning hole, positioning the oil inlet and oil port between the two sealing rings. This allows the medium from the oil inlet to enter the oil port of the cartridge valve through the sealing section, eliminating the need for alignment between the oil inlet and oil port, thus improving efficiency. Simultaneously, a cylinder drives a pressure arm to fix the cartridge valve within the positioning hole, preventing the cartridge valve from loosening.

[0020] The two stepped platform surfaces are matched with the stepped surface of the cartridge valve. The downward pressure of the cylinder arm makes the cartridge valve press tightly against the sealing ring of the positioning hole, thus achieving a sealed connection between the cartridge valve and the positioning hole.

[0021] A rotating clamping cylinder is used to lift the pressure arm and rotate it to one side, thus avoiding interference between the pressure arm and the cartridge valve. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Cross-sectional view of the connection structure between the central support body and the support frame;

[0025] Figure 3 This is a schematic diagram of the connection structure between the base and the fixing frame.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Positioning unit; 11-Base; 12-Positioning hole; 121-Sealing section; 122-Oil outlet section; 123-Sealing ring; 124-First step; 125-Second step; 13-Oil inlet; 14-Oil outlet; 2-Pressing unit; 21-Cylinder; 22-Pressure arm; 3-Support frame; 5-Fixing clip; 51-Connecting shaft; 52-Fixing hole; 53-Locking nut; 54-Clamping piece; 55-Connecting piece. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] The test fixture for the aero-engine cartridge valve 4 of the present invention includes a positioning unit 1 and a pressing unit 2. The positioning unit 1 includes a positioning seat 11 and a positioning hole 12 opened in the seat 11. The inner wall of the positioning hole 12 is provided with a sealing section 121. Sealing rings 123 are respectively provided at both ends of the sealing section 121. An oil inlet 13 is connected to the sealing section 121, so that the oil inlet 13 communicates with the sealing section 121. One end of the positioning hole 12 is connected to the oil outlet 14. The pressing unit 2 is placed on one side of the positioning unit 1. The pressing unit 2 includes a cylinder 21. The piston rod end of the cylinder 21 is provided with a pressure arm 21. The end of the pressure arm 21 can press tightly against the top of the cartridge valve 4.

[0033] During operation, the cartridge valve 4 is inserted into the hole, so that the side wall of the cartridge valve 4 is pressed tightly against the two sealing rings 123. At the same time, the two sealing rings 123 are positioned on both sides of the oil inlet of the cartridge valve 4, so that the oil inlet nozzle 13 can communicate with the oil inlet of the cartridge valve 4 through the sealing section 121. The medium used for the test enters the sealing section 121 through the oil inlet nozzle 13, and then enters the cartridge valve 4 through the oil inlet. After the medium enters the cartridge valve 4, it flows through the internal channel of the cartridge valve 4 and then flows out from the oil outlet and enters the oil outlet nozzle 14 to be discharged outward. Thus, the medium used for the test flows through the cartridge valve 4 to facilitate the testing of the performance of the cartridge valve 4. At the same time, since the sealing section 121 is annular after the cartridge valve 4 is inserted into the positioning hole 12, the oil inlet of the cartridge valve 4 can communicate with the sealing section 121 at any angle, avoiding the need to adjust the angle when installing the cartridge valve 4, saving test time and improving test efficiency.

[0034] The positioning hole 12 is provided with a first step 124 and a second step 125, and the platform surfaces 1251 of the first step 124 and the second step 125 are respectively facing the same end of the positioning hole 12. The two sealing rings 123 are respectively placed on the first step 124 and the second step 125. The outer wall of the cartridge valve 4 is provided with two stepped surfaces 41, and the two stepped surfaces 41 can respectively abut against the platform surfaces 1251 of the first step 124 and the second step 125. In this way, when the pressure arm 21 presses down on the cartridge valve 4, the pressure can make the cartridge valve 4 press tightly against the sealing ring 123, preventing the sealing ring 123 from sliding along the axial direction of the positioning hole 12 during the insertion of the cartridge valve 4 into the positioning hole 12. At the same time, it improves the sealing effect of the sealing section 121 and prevents the medium entering the sealing section 121 from flowing directly from the gap between the cartridge valve 4 and the positioning hole 12 to the oil outlet, which would affect the test accuracy.

[0035] The positioning hole 12 is provided with an oil outlet section 122, which is located at the bottom end of the positioning hole 12. The oil outlet nozzle 14 is connected to the oil outlet section 122, and the oil outlet of the cartridge valve 4 can extend into the oil outlet section 122 so that the medium discharged from the oil outlet of the cartridge valve 4 can flow into the oil outlet nozzle 14 through the oil outlet section 122. At the same time, after the cartridge valve 4 is pulled out, the medium remaining in the sealing section 121 can also be discharged through the oil outlet section 122, which facilitates the cleaning of impurities in the positioning hole 12 and avoids the medium remaining in the positioning hole 12 from affecting subsequent tests.

[0036] The test fixture also includes a support frame 3. The seat 11 and cylinder 21 are fixed on the support frame 3. Optionally, a fixing clip 5 is fixed on the support frame 3, with a connecting shaft 51 extending from one side. The connecting shaft 51 passes through the support frame 3, and a locking nut 53 is screwed to the connecting shaft 51, so that the fixing clip 5 is fixed on the support frame 3. The seat 11 is fixed to the fixing clip 5. More specifically, the specified function clip includes two opposing clamping plates. The bottom of the seat 11 extends between the two clamping plates. The outer ends of the two clamping plates are provided with connecting ears, and the two connecting ears are connected by bolts. The bolts pass through the two clamping plates, so that the two clamping plates clamp the seat 11. The support frame 3 and the connecting shaft 51 have corresponding fixing holes 52 in a direction perpendicular to the axial direction of the connecting shaft 51. A positioning pin is inserted into the fixing holes 52 of the support frame 3 and the connecting shaft 51 to prevent the fixing clip 5 from rotating around the axis of the connecting shaft 51. The cylinder 21 is a corner clamping cylinder 21, which allows the pressure arm 21 to rotate out of the projection range of the positioning hole 12 after being lifted. The cylinder body of the cylinder 21 can also be fixed to the support frame 3 by another fixing clip 5, and its fixing method can be the same as that of the seat 11, which will not be described in detail here. In other embodiments, a platform can also be provided on the top of the support frame 3 to fix the seat 11 and the cylinder body of the cylinder 21 on the platform.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test fixture for cartridge valves in aero-engines, characterized in that: include The positioning unit includes a positioning hole that communicates with an oil inlet and an oil outlet. The inner wall of the positioning hole is provided with two sealing rings to form a sealing section, and the oil inlet is positioned between the two sealing rings. The cartridge valve can be inserted into the positioning hole, and the outer wall of the cartridge valve can be pressed tightly against the two sealing rings. The oil inlet of the cartridge valve is placed between the two sealing rings, so that the oil inlet is connected to the oil inlet through the sealing section, and the oil outlet of the cartridge valve is connected to the oil outlet. The pressing unit includes a cylinder, and the piston rod end of the cylinder is provided with a pressing arm, the end of which can press tightly against the top of the cartridge valve.

2. The test fixture for aero-engine cartridge valve according to claim 1, characterized in that: The positioning hole is provided with a first step and a second step, and the platform surfaces of the first step and the second step are respectively facing the same end of the positioning hole. The two sealing rings are respectively placed on the first step and the second step. The outer wall of the cartridge valve is provided with two stepped surfaces, and the two stepped surfaces can respectively abut against the platform surfaces of the first step and the second step.

3. The test fixture for a cartridge valve of an aero-engine according to claim 1, characterized in that: The positioning hole is provided with an oil outlet section, which is located at the bottom of the positioning hole. The oil outlet nozzle is connected to the oil outlet section, and the oil outlet of the cartridge valve can extend into the oil outlet section.

4. The test fixture for aero-engine cartridge valve according to claim 1, characterized in that: The test fixture also includes a support frame, and the positioning unit also includes a base, with the positioning hole opening on the base.

5. The test fixture for aero-engine cartridge valve according to claim 4, characterized in that: It also includes a fixing clip with a connecting shaft extending from one side. The connecting shaft passes through the support frame, and a locking nut is screwed to the connecting shaft, so that the fixing clip is fixed on the support frame; the base body is fixedly connected to the fixing clip.

6. The test fixture for aero-engine cartridge valve according to claim 5, characterized in that: The support frame and the connecting shaft have corresponding fixing holes in a direction perpendicular to the axial direction of the connecting shaft, and a positioning pin is inserted into the fixing holes of the support frame and the connecting shaft.

7. The test fixture for a cartridge valve of an aero-engine according to claim 5, characterized in that: The specified function card includes two opposing tabs, and the bottom of the base extends between the two tabs.

8. The test fixture for a cartridge valve of an aircraft engine according to claim 7, characterized in that: The outer ends of the two plates are provided with connecting ears, and the two connecting ears are connected by bolts.

9. The test fixture for a cartridge valve of an aircraft engine according to claim 1, characterized in that: The cylinder is a rotary clamping cylinder, which allows the pressure arm to be lifted and rotated out of the projection range of the positioning hole.

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