A mechanism and method for high pressure testing of precision fluidics elements

Abstract

The application discloses a mechanism and method for high-pressure test of precision fluidic element, which comprises a multi-path test block, an upper cover plate, a lower cover plate, upper and lower pressing positioning blocks, a gantry, a screw rod, a test bench, a pressure sensor, a flow sensor and the like. The multi-path test block is used for switching in and back oil circuits to provide oil pressure for the fluidic element; the upper cover plate ensures that the precision fluidic element can be sealed with the multi-path test block and ensures that the in and back oil circuits of the fluidic element communicate with the multi-path test block; the test bench comprises the pressure sensor and is used for testing the input and output pressure and flow of the fluidic element; and the gantry is used for the upper cover plate to ensure the sealing effect of the oil circuit. The embodiment of the application can realize independent high-pressure performance test before the precision fluidic element is assembled and used, ensures that the subsequent assembled elements are qualified parts, improves the overall performance of the product, and avoids the repeated disassembly and assembly process caused by unqualified element performance.

Description

Technical Field

[0001] This invention relates to a hydraulic testing method and mechanism for servo valves, and more particularly to a mechanism and method for high-pressure testing of precision jet components. Background Technology

[0002] With the rapid development of demand for military airborne products, the performance and reliability of servo valves urgently need to be improved. Among them, the precision jet element is the core component of the jet-type servo valve, and the performance of the jet element has a crucial impact on the overall performance of the servo valve.

[0003] Precision jet elements are extremely small and require interference fit to be press-fitted into jet assemblies for hydraulic testing. If performance fails, the jet element must be pressed out and replaced, which reduces or even eliminates the interference fit between the jet element and the assembly, leading to performance degradation and even component scrapping. This also causes repeated assembly processes and increases production cycles. Furthermore, due to the extremely small critical working dimensions of the jet element, its machining is difficult, and its microscopic morphology has a significant impact. Therefore, its hydraulic performance cannot be accurately assessed through dimensional measurement and microscopic observation optical methods.

[0004] How to achieve accurate and rapid performance testing of jet components before assembly, so as to screen jet components in advance and avoid repeated performance degradation, scrapping and increased cycle time caused by subsequent assembly, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a mechanism and method for high-voltage testing of precision jet components, which offers high testing accuracy and ease of operation.

[0006] The first aspect of this invention provides a mechanism for high-pressure testing of precision jet components, comprising: a multi-channel test block 1, an upper cover plate 2, a lower cover plate 3, a lower clamping and positioning block 41, an upper clamping and positioning block 42, a gantry frame 5, a screw 6, a positioning pin 8, a test bench 10, a pressure sensor, a flow sensor, and a valve, wherein:

[0007] The test bench 10 is equipped with an oil inlet and a return oil inlet and two control chambers. Pressure sensors are installed on all four pipelines, flow sensors are installed on the return oil inlet pipeline, and valves are installed on both the oil inlet and return oil inlet pipelines.

[0008] The multi-channel test block 1 is mounted on the test bench 10. An annular groove is carved out in the center of the upper surface, and a positioning boss is formed in the center. The positioning boss is provided with a positioning pin 8 and an interface for the inlet and return oil passages and the control chamber. The interface for the inlet and return oil passages and the control chamber are respectively connected to the inlet and return oil inlets and the two control chambers. Positioning grooves are provided on both sides of the multi-channel test block 1.

[0009] The upper cover plate 2, the jet element to be tested 7, and the lower cover plate 3 are sequentially mounted on the positioning pin 8 from top to bottom. Each interface of the jet element 7 is connected to the inlet and outlet oil circuits and the control chamber's adapter interface, respectively.

[0010] The lower clamping positioning block 41 is sleeved on the outside of the upper cover plate 2, the jet element 7 to be tested and the lower cover plate 3, and is clearance-fitted; the lower end face of the lower clamping positioning block 41 covers the annular groove.

[0011] The gantry frame 5 is slidably mounted on the positioning groove. The gantry frame 5 is provided with threaded holes, and the screw 6 passes through the threaded holes. The bottom of the screw 6 is connected to the upper clamping positioning block 42, which is positioned above the lower clamping positioning block 41. It is used to clamp the jet element 7 to be tested for high-pressure testing.

[0012] Optionally, a gasket is also provided between the central groove of the lower clamping positioning block 41 and the upper cover plate 2.

[0013] Optionally, the total height of the gasket, upper cover plate 2, jet element 7 to be tested, and lower cover plate 3 is greater than the depth of the central groove of the lower clamping positioning block 41. The difference is approximately 0.02 to 0.05 mm.

[0014] Optionally, the structure of the upper cover plate 2 and the lower cover plate 3 is consistent with the structure of the upper and lower cover plates that the jet element 7 under test contacts in the hydraulic servo valve.

[0015] Optionally, the upper and lower clamping positioning blocks are made of beryllium bronze;

[0016] The multi-channel test block 1, gantry 5, and screw 6 are made of martensitic stainless steel.

[0017] The upper cover plate 2 and the lower cover plate 3 are made of bearing steel.

[0018] Optionally, the outer contour of the upper and lower pressing positioning blocks is square or circular, and the inner central groove is circular.

[0019] Optionally, when the outer contour of the upper and lower clamping positioning blocks is circular, the outer cylindrical surface is provided with knurled M0.6.

[0020] Optionally, a sealing ring is provided in the annular groove.

[0021] A second aspect of the present invention provides a method for high-voltage testing of precision jet elements, employing the structure described in any one of the first aspects, comprising the following steps:

[0022] Install the multi-channel test block 1 on the test bench;

[0023] The lower cover plate 3 is installed above the positioning boss of the multi-channel test block 1 and positioned by two positioning pins 8.

[0024] The jet element 7 is installed above the lower cover plate 3 and positioned by two positioning pins 8;

[0025] The upper cover plate 2 is installed above the jet element 7 and positioned by two positioning pins 8;

[0026] The lower pressing and positioning block 41 is installed above the upper cover plate 2 with its central groove facing downwards.

[0027] The gantry frame 5 is connected through the positioning slot of the multi-channel test block 1;

[0028] Tighten the screw 6 so that the upper clamping positioning block 42 installed at the bottom of the screw 6 presses against the lower clamping positioning block 41;

[0029] Adjust the opening degree of each valve, and circulate high-pressure hydraulic oil through the test bench 10. Test the hydraulic performance of the jet element 7 through each pressure sensor and flow sensor.

[0030] Optionally, the multi-channel test block 1 is bolted to the test bench 10, with an installation torque of 5±0.5Nm;

[0031] The screw 6 is tightened by a torque wrench, and the tightening torque is controlled at 10±2 N.m.

[0032] This invention provides a mechanism and method for high-pressure testing of precision jet components, solving the problem that the hydraulic performance of precision jet components cannot be tested and evaluated independently. It provides a universal testing mechanism and method for jet components, with high testing accuracy and repeatability, simple operation and high efficiency, ensuring that the jet components assembled subsequently are all qualified components, and avoiding the problems of component damage and efficiency reduction caused by repeated disassembly and assembly. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a testing mechanism according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the test bench principle according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of a multi-channel test block according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of a positioning pin according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the lower cover plate according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of a jet element according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the structure of the upper cover plate according to an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the lower clamping positioning block according to an embodiment of the present invention. Figure 1 ;

[0042] Figure 9 This is a schematic diagram of the structure of the lower clamping positioning block according to an embodiment of the present invention. Figure 2 ;

[0043] Figure 10 This is a schematic diagram of the structure of a gantry frame according to an embodiment of the present invention. Figure 1 ;

[0044] Figure 11 This is a schematic diagram of the structure of a gantry frame according to an embodiment of the present invention. Figure 2 ;

[0045] Figure 12 This is a schematic diagram of the gantry frame after tightening according to an embodiment of the present invention. Figure 1 ;

[0046] Figure 13 This is a schematic diagram of the gantry frame after tightening according to an embodiment of the present invention. Figure 2 ;

[0047] Explanation of reference numerals in the attached figures:

[0048] 1-Multi-channel test block, 2-Upper cover plate, 3-Lower cover plate, 41-Lower clamping positioning block, 42-Upper clamping positioning block, 5-Gantry frame, 6-Screw, 7-Jet element, 8-Positioning pin, 10-Test bench, 11-Bolt, P-Inlet oil circuit, R-Return oil circuit, C1-First control chamber, C2-Second control chamber, PS-Pressure sensor (inlet oil), PR-Pressure sensor (return oil), PC1-Pressure sensor (first control chamber), PC2-Pressure sensor (second control chamber), L1-Flow sensor, K1-Inlet valve, K2-Return valve. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0051] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] like Figure 1-13 As shown, the present invention provides a mechanism for high-pressure testing of precision jet components, comprising: a multi-channel test block 1, an upper cover plate 2, a lower cover plate 3, a lower clamping and positioning block 41, an upper clamping and positioning block 42, a gantry frame 5, a screw 6, a positioning pin 8, a test bench 10, a pressure sensor, a flow sensor, and a valve, wherein:

[0053] The test bench 10 is equipped with an oil inlet and a return oil inlet and two control chambers. Pressure sensors are installed on all four pipelines, flow sensors are installed on the return oil inlet pipeline, and valves are installed on both the oil inlet and return oil inlet pipelines.

[0054] The multi-channel test block 1 is mounted on the test bench 10. An annular groove is carved out in the center of the upper surface, and a positioning boss is formed in the center. The positioning boss is provided with a positioning pin 8 and an interface for the inlet and return oil passages and the control chamber. The interface for the inlet and return oil passages and the control chamber are respectively connected to the inlet and return oil inlets and the two control chambers. Positioning grooves are provided on both sides of the multi-channel test block 1.

[0055] The upper cover plate 2, the jet element to be tested 7, and the lower cover plate 3 are sequentially mounted on the positioning pin 8 from top to bottom. Each interface of the jet element 7 is connected to the inlet and outlet oil circuits and the control chamber's adapter interface, respectively.

[0056] The lower clamping positioning block 41 is sleeved on the outside of the upper cover plate 2, the jet element 7 to be tested and the lower cover plate 3, and is clearance-fitted; the lower end face of the lower clamping positioning block 41 covers the annular groove.

[0057] The gantry frame 5 is slidably mounted on the positioning groove. The gantry frame 5 is provided with threaded holes, and the screw 6 passes through the threaded holes. The bottom of the screw 6 is connected to the upper clamping positioning block 42, which is positioned above the lower clamping positioning block 41. It is used to clamp the jet element 7 to be tested for high-pressure testing.

[0058] Optionally, a gasket is also provided between the central groove of the lower clamping positioning block 41 and the upper cover plate 2.

[0059] Optionally, the total height of the gasket, upper cover 2, jet element 7 to be tested, and lower cover 3 is greater than the depth of the central groove of the lower clamping positioning block 41. For example, the difference is approximately 0.02 to 0.05 mm.

[0060] Optionally, the structure of the upper cover plate 2 and the lower cover plate 3 is consistent with the structure of the upper and lower cover plates that the jet element 7 under test contacts in the hydraulic servo valve.

[0061] Optionally, the upper and lower clamping positioning blocks are made of beryllium bronze;

[0062] The multi-channel test block 1, gantry 5, and screw 6 are made of martensitic stainless steel.

[0063] The upper cover plate 2 and the lower cover plate 3 are made of bearing steel.

[0064] Optionally, the outer contour of the upper and lower pressing positioning blocks is square or circular, and the inner central groove is circular.

[0065] Optionally, when the outer contour of the upper and lower clamping positioning blocks is circular, the outer cylindrical surface is provided with knurled M0.6.

[0066] Optionally, a sealing ring is provided in the annular groove.

[0067] Figure 1 This is a schematic diagram of the structure of a testing mechanism according to an embodiment of the present invention, which does not include the test bench.

[0068] like Figure 1As shown, the mechanism for high-pressure testing of precision jet elements may include: a multi-channel test block 1, an upper cover plate 2, a lower cover plate 3, a lower clamping positioning block 41, an upper clamping positioning block 42, a gantry frame 5, and a screw 6. The multi-channel test block 1 is equipped with two positioning pins 8 for positioning with the upper cover plate 2, the lower cover plate 3, and the jet element 7. The lower clamping positioning block 41 and the upper clamping positioning block 42 are installed above the upper cover plate 2 and below the screw 6, respectively. The gantry frame 5 and the screw 6 are connected by threads. The top of the screw 6 is designed with a square hole structure to accommodate a torque wrench for applying torque.

[0069] Figure 2 This is a schematic diagram of the oil circuit and sensor structure of the test bench according to an embodiment of the present invention.

[0070] like Figure 2 As shown, the test bench can include: 4 oil circuits, namely oil inlet P, oil return R, first control chamber C1, and second control chamber C2; 4 pressure sensors, namely pressure sensor (oil inlet) PS, pressure sensor (oil return) PR, pressure sensor (first control chamber) PC1, and pressure sensor (second control chamber) PC2, which are used to detect the pressure of oil inlet P, oil return R, first control chamber C1, and control chamber C2, respectively; flow sensor L1 is connected in series in the oil return R circuit to detect internal leakage; oil inlet valve K1 is used to control the opening and closing of the oil inlet circuit and control the oil inlet pressure, and oil return valve K2 is used to control the opening and closing of the oil return circuit and control the oil inlet pressure.

[0071] In some embodiments, the operating dimensions of the multi-channel test block 1, the gantry 5, and the test bench 10 can be adjusted according to the actual space size, but the oil circuit distribution at the bottom of the multi-channel test block 1 and the oil circuit distribution at the top of the test bench 10 need to correspond, and the bolt mounting hole positions need to correspond, so as to ensure smooth mechanical connection and oil circuit communication.

[0072] In some embodiments, the bolts 11 for mounting the multi-channel test block 1 can be of specifications other than M5, and appropriate tightening torques can be used; the screw 6 can be tightened to the appropriate torque according to the thread specification and test pressure.

[0073] In some embodiments, the outer contours of the lower clamping positioning block 41 and the upper clamping positioning block 42 can also be set to square, which facilitates the operator to grasp and position them. When the outer contour is square, the outer surface may not be provided with anti-slip treatment such as knurling.

[0074] In some embodiments, the top of the screw 6 can also be designed with other fastening forms, not limited to square hole, internal hexagon, external hexagon, etc.

[0075] This invention also provides a high-voltage testing method for precision jet components, which can be used in the aforementioned testing mechanisms. The method may include the following steps:

[0076] S101, install the multi-channel test block 1 on the test bench using four M5 bolts 11, and set the tightening torque to (5±0.5) Nm. At this time, valves K1 and K2 are both in the open state.

[0077] S102, Install the lower cover plate 3 above the multi-channel test block 1 and position it using two positioning pins 8;

[0078] S103, the jet element 7 is installed above the lower cover plate 3 and positioned by two positioning pins 8;

[0079] S104, the upper cover plate 2 is installed above the jet element 7 and positioned by two positioning pins 8. The positioning pins 8 will not protrude from the upper surface of the upper cover plate 2 at this time.

[0080] S105, with the inner hole of the lower clamping positioning block 41 facing down, install it above the upper cover plate 2;

[0081] S106, connect the gantry frame 5 through the positioning slot of the multi-channel test block 1;

[0082] S107, tighten screw 6, the bottom of screw 6 is equipped with upper pressure positioning block 42, tightening torque (10±2)Nm;

[0083] S108, open valves K1 and K2, observe the pressure sensors (PS, PR), and adjust to the specified inlet and return oil pressures;

[0084] S109, open valves K1 and K2, and observe the pressure sensors (PC1, PC2) and flow sensor (L1).

[0085] In some embodiments, the method may further include: in S106, the gantry 5 is not connected through the positioning slot of the multi-way test block 1, but may also be connected by bolts, integral processing, or other methods.

[0086] The above-described embodiments of the invention can uniformly apply downward pressure during the testing of the jet element, ensuring tight sealing between all components and the jet element itself. This guarantees that no leakage will occur between the jet outlet and the receiving cavity of the jet element during use, thereby ensuring the accuracy of the jet element performance test. The use of a gantry frame simplifies the fastening method and improves testing efficiency.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A mechanism for high-voltage testing of precision jet components, characterized in that, include: The test bench includes a multi-channel test block (1), an upper cover plate (2), a lower cover plate (3), a lower clamping positioning block (41), an upper clamping positioning block (42), a gantry frame (5), a screw (6), a positioning pin (8), a test bench (10), a pressure sensor, a flow sensor, and valves, among which: The test bench (10) is equipped with an oil inlet and a return oil inlet and two control chambers. Pressure sensors are installed on all four pipelines, flow sensors are installed on the return oil inlet pipeline, and valves are installed on both the oil inlet and return oil inlet pipelines. The multi-channel test block (1) is set on the test bench (10). An annular groove is dug in the center of the upper surface, and a positioning boss is formed in the center. A positioning pin (8) and the interface of the inlet and return oil circuit and the control cavity are provided on the positioning boss. The interface of the inlet and return oil circuit and the control cavity are respectively connected to the inlet and return oil inlet and the two control cavities. Positioning grooves are provided on both sides of the multi-channel test block (1). The upper cover plate (2), the jet element to be tested (7) and the lower cover plate (3) are sequentially mounted on the positioning pin (8) from top to bottom. Each interface of the jet element (7) is connected to the inlet and outlet oil circuits and the control chamber respectively. The lower clamping positioning block (41) is sleeved on the outside of the upper cover plate (2), the jet element (7) to be tested and the lower cover plate (3), and is clearance-fitted; the lower end face of the lower clamping positioning block (41) covers the annular groove; The gantry (5) is slidably mounted on the positioning groove. The gantry (5) is provided with a threaded hole. The screw (6) passes through the threaded hole. The bottom of the screw (6) is connected to the upper clamping positioning block (42). The upper clamping positioning block (42) is located above the lower clamping positioning block (41) and is used to clamp the jet element (7) to be tested for high pressure testing.

2. The mechanism for high-voltage testing of precision jet elements according to claim 1, characterized in that, A gasket is also provided between the central groove of the lower pressing positioning block (41) and the upper cover plate (2).

3. The mechanism for high-voltage testing of precision jet elements according to claim 2, characterized in that, The total height of the gasket, upper cover plate (2), jet element to be tested (7), and lower cover plate (3) is greater than the depth of the central groove of the lower clamping positioning block (41). The difference is approximately 0.02 to 0.05 mm.

4. The mechanism for high-voltage testing of precision jet elements according to claim 1, characterized in that, The structure of the upper cover plate (2) and the lower cover plate (3) is consistent with the structure of the upper and lower cover plates that the jet element (7) under test contacts in the hydraulic servo valve.

5. The mechanism for high-voltage testing of precision jet elements according to claim 2, characterized in that, The upper and lower clamping positioning blocks are made of beryllium bronze; The multi-channel test block (1), gantry (5), and screw (6) are made of martensitic stainless steel. The upper cover plate (2) and the lower cover plate (3) are made of bearing steel.

6. The mechanism for high-voltage testing of precision jet elements according to claim 1, characterized in that, The outer contour of the upper and lower clamping positioning blocks is square or circular, and the inner central groove is circular.

7. The mechanism for high-voltage testing of precision jet elements according to claim 6, characterized in that, When the outer contour of the upper and lower clamping positioning blocks is circular, the outer cylindrical surface is provided with knurled M0.

6.

8. The mechanism for high-voltage testing of precision jet components according to claim 1, characterized in that, A sealing ring is provided in the annular groove.

9. A method for high-voltage testing of precision jet components, characterized in that, The structure described in any one of claims 1-8 is characterized by comprising the following steps: The multi-channel test block (1) is installed on the test bench; The lower cover plate (3) is installed above the positioning boss of the multi-channel test block (1) and positioned by two positioning pins (8); The jet element (7) is installed above the lower cover plate (3) and positioned by two positioning pins (8); The upper cover plate (2) is installed above the jet element (7) and positioned by two positioning pins (8); The lower pressing positioning block (41) is installed above the upper cover plate (2) with its central groove facing downward. The gantry (5) is connected through the positioning slot of the multi-channel test block (1); Tighten the screw (6) so that the upper clamping positioning block (42) installed at the bottom of the screw (6) presses against the lower clamping positioning block (41); Adjust the opening of each valve, and circulate high-pressure hydraulic oil through the test bench (10). Test the hydraulic performance of the jet element (7) through each pressure sensor and flow sensor.

10. The method for high-voltage testing of precision jet components according to claim 9, characterized in that, The multi-channel test block (1) is connected to the test bench (10) by bolts, with an installation torque of (5±0.5) Nm; The screw (6) is tightened by a torque wrench, and the tightening torque is controlled at (10±2) Nm.

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