Supercharged pressure pulse test system and method

Abstract

The invention discloses a supercharged pressure pulse test system and method. An outlet of the main hydraulic system is connected with an inlet of the servo reversing valve (1), an outlet of the servo reversing valve (1) is connected with a low-pressure cavity of the pressure cylinder (2), and a high-pressure cavity of the pressure cylinder (2) is connected with the oil supplementing hydraulic system. And the pressure measuring tube (3) is used for acquiring and testing pressure. According to the invention, test requirements of aviation high-pressure pulse products can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation pressure pulse, and in particular relates to a pressurized pressure pulse test system and method. Background Art

[0002] Aviation hydraulic systems are often accompanied by high-pressure pulse conditions. Therefore, aviation hydraulic products must be subjected to pressure pulse assessments. Due to the complex structure of the pressure pulse test bench system, each accessory of the system will affect the pulse test peak pressure, pressure rise rate, and waveform control. During the test, it is difficult to keep the test parameters stable, and continuous manual intervention and adjustment are required.

[0003] According to the traditional pressure pulse test method, since a single-function electro-hydraulic directional valve is used for reversing to realize the reciprocating pulse of pressure, and the test pressure is directly driven by the hydraulic pump to form high pressure, the pressure can only meet the test requirements below 28MPa. During the high-pressure pulse process, the system vibration amplitude is too large, which can easily cause parameters such as pressure, peak value, and pressure increase and decrease rate to be difficult to maintain stability. The 100,000 pulse process of a single product requires repeated debugging. Excessive system pressure will cause the system oil temperature to rise sharply, resulting in a short service life of equipment pipelines, accessories and seals. Faced with the continuous improvement of test indicators required for newly developed products, traditional pressure pulse test methods can no longer meet the testing needs of newly developed products. Summary of the invention

[0004] The purpose of the present invention is to provide a pressurized pressure pulse test system and method. The present invention can meet the test requirements of aviation high-pressure pressure pulse products.

[0005] The technical solution of the present invention is: a boosted pressure pulse test system, including a main hydraulic system, the outlet of the main hydraulic system is connected to the inlet of a servo reversing valve, the outlet of the servo reversing valve is connected to the low-pressure chamber of the boosting cylinder, and the high-pressure chamber of the boosting cylinder is connected to the oil replenishing hydraulic system; it also includes a pressure measuring tube for collecting the test pressure.

[0006] In the aforementioned boost pressure pulse test system, the main hydraulic system comprises a main hydraulic pump, and the outlet of the main hydraulic pump is connected to the inlet of the servo reversing valve.

[0007] In the aforementioned boost pressure pulse test system, the outlet of the main hydraulic pump is also connected to the oil tank via a proportional relief valve A.

[0008] In the aforementioned pressurized pressure pulse test system, the pressure measuring tube is a stainless steel tube with a diameter of 4 mm and a length of 0.8 to 1.2 m.

[0009] In the aforementioned boost pressure pulse test system, the oil replenishment hydraulic system connection includes an oil replenishment hydraulic pump, and the outlet of the oil replenishment hydraulic pump is connected to the high-pressure chamber of the boost cylinder through a one-way valve.

[0010] In the aforementioned boost pressure pulse test system, the outlet of the oil replenishment hydraulic pump is also connected to the oil tank through the proportional relief valve B.

[0011] The test method of the aforementioned pressurized pressure pulse test system comprises the following steps:

[0012] S1. Connect the inlet of the test piece to the high-pressure chamber of the booster cylinder, connect the outlet of the test piece to the pressure measuring tube, and arrange a pressure transmitter on the pressure measuring tube.

[0013] S2. Start the oil replenishment hydraulic system to exhaust the gas in the high-pressure chamber of the booster cylinder, the test piece, the connecting pipeline between the high-pressure chamber and the test piece, and the pressure measuring tube through the oil;

[0014] S3. Start the main hydraulic system, supply oil to the low-pressure chamber of the booster cylinder through the servo reversing valve, push the piston of the booster cylinder to increase the pressure of the high-pressure chamber of the booster cylinder, and then increase the pressure of the test piece;

[0015] S4. Collect pressure transmitter data to complete the test.

[0016] In the test method of the aforementioned boost pressure pulse test system, in step S3, after starting the main hydraulic system, the host computer electrically connected to the servo reversing valve sends a servo reversing valve control signal to the servo reversing valve so that the pressure transmitter collects the required pressure waveform.

[0017] The advantages of the present invention are: compared with the traditional pressure pulse test which is only applicable to pressures below 28MPa, the present invention can realize high-pressure pressure pulse tests above 35MPa, and can also achieve precise control of the waveform, thereby meeting the requirements of aviation high-pressure pressure pulse product testing.

[0018] Compared with the traditional pressure pulse test that directly uses a hydraulic pump to drive the electro-hydraulic controlled reversing valve to achieve pressure shock, the present invention mainly adopts a booster cylinder structure, and the high-pressure chamber of the booster cylinder is pressurized by the reciprocating motion of the hydraulic piston in the low-pressure chamber of the booster cylinder; this method completely isolates the driving part and the working part, and plays the role of pressurization and isolation; in the present invention, when the pressure of the driving part (low-pressure chamber) is 11MPa, the pressure of the working part (high-pressure chamber) can reach more than 35MPa; the traditional pressure pulse test does not isolate the driving part and the working part, and the pressure of the entire test system is equal to the pump source pressure (maximum 28MPa). In contrast, since the driving part pressure of the present invention is relatively low, the damage such as severe vibration of the test equipment caused by the traditional pressure pulse is effectively avoided.

[0019] The present invention designs a "time-opening" array matrix in the upper computer to control the servo reversing valve. By setting the opening in time periods such as peaks, troughs, each oscillation peak value, rated pressure, and minimum test pressure within the waveform period, the opening of the servo reversing valve is accurately controlled, and waveform control is ultimately achieved.

[0020] The present invention can control the pressure increase rate by adjusting the servo valve opening in the peak time period, the opening holding time in the peak time period, and the system pressure of the main hydraulic system through the host computer. Based on this, the pressure increase rate of the present invention can be adjusted within 5MPa / s to 4000MPa / s.

[0021] The present invention can be applied to various pressure waveform controls, such as water hammer wave, reciprocating pressure difference shock wave, square wave, trapezoidal wave, sine wave and other pressure alternating tests, and has a wide range of applications.

[0022] To sum up, the present invention can realize high-pressure pressure pulse testing through a relatively low hydraulic system pressure, which can meet the requirements of pulse test boost rate of products of different cavity types. The boost rate (5MPa / s~4000MPa / s) is stable and controllable, the test waveform control accuracy is high, the test process is stable and reliable, and can meet the testing needs of high-pressure pressure pulse products. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the principle diagram of the hydraulic part of the test system of the present invention.

[0024] Figure 2 This is a comparison of the pressure measuring tubes of different lengths with a rated pressure of 28MPa;

[0025] Figure 3 It is the real-time waveform curve of pressure measuring tubes of different lengths with a rated pressure of 28MPa. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] Example 1. A pressurized pressure pulse test system, see Figure 1-3 , which can realize high-pressure pressure pulse test above 35MPa, and can realize precise control of the servo valve opening in any time period of the waveform, thereby realizing precise control of the pressure pulse waveform, and meeting the test of aviation high-pressure pressure pulse products. It includes: main hydraulic system, the outlet of the main hydraulic system is connected to the inlet of the servo reversing valve 1, the outlet of the servo reversing valve 1 is connected to the low-pressure chamber of the booster cylinder 2, and the high-pressure chamber of the booster cylinder 2 is connected to the oil replenishment hydraulic system; it also includes a pressure measuring tube 3 for collecting test pressure. Among them, the model of the booster cylinder 2 is ZWRT90-50 / 130GZ.

[0030] The aforementioned main hydraulic system comprises a main hydraulic pump 4 , the outlet of which is connected to the inlet of the servo reversing valve 1 .

[0031] The outlet of the aforementioned main hydraulic pump 4 is also connected to the oil tank 9 via a proportional relief valve A5.

[0032] The aforementioned pressure measuring tube 3 is a stainless steel tube with a diameter of 4 mm and a length of 0.8 to 1.2 m.

[0033] The oil replenishment hydraulic system connection includes an oil replenishment hydraulic pump 6 , and the outlet of the oil replenishment hydraulic pump 6 is connected to the high-pressure chamber of the booster cylinder 2 through a one-way valve 7 .

[0034] The outlet of the aforementioned oil replenishment hydraulic pump 6 is also connected to the oil tank 9 via a proportional relief valve B8.

[0035] The test method of the aforementioned pressurized pressure pulse test system comprises the following steps:

[0036] S1. The inlet of the test piece 10 is connected to the high-pressure chamber of the booster cylinder 2, the outlet of the test piece 10 is connected to the pressure measuring tube 3, and a pressure transmitter 11 is arranged on the pressure measuring tube 3; the pressure transmitter 11 can select different ranges according to the test pressure requirements.

[0037] S2. Start the oil replenishment hydraulic system, and exhaust the gas in the high-pressure chamber of the booster cylinder 2, the test piece 10, the connecting line between the high-pressure chamber and the test piece 10, and the pressure measuring tube 3 through the oil;

[0038] S3. Start the main hydraulic system, supply oil to the low-pressure chamber of the booster cylinder 2 through the servo reversing valve 1, push the piston of the booster cylinder 2 to increase the pressure in the high-pressure chamber of the booster cylinder 2, and then increase the pressure of the test piece 10;

[0039] S4. Collect data from the pressure transmitter 11 to complete the test.

[0040] In step S3 , after the main hydraulic system is started, the upper computer electrically connected to the servo reversing valve 1 sends a servo reversing valve 1 control signal to the servo reversing valve 1 , so that the pressure transmitter 11 collects the required pressure waveform.

[0041] Use 3 sections of 0.8-1.2m stainless steel pressure measuring tube to connect the outlet of the test piece and the pressure transmitter 11. The 3 sections of the standardized conversion joint pressure measuring tube are usually M12 nozzles. Through a large number of comparative tests, in order to measure various harmonic signals contained in the measured signal as undistorted as possible. At the same time, taking into account the pipeline response, temperature influence and vibration, and the influence of the pressure pulse test conditions, the length of the pressure measuring tube 3 is preferably 0.8-1.2m.

[0042] Note: Our factory has tested and verified the effect of the pressure measuring tube length on the peak value, and the results are as follows:

[0043] Select the influence of different lengths of pressure measuring tubes on the peak value under a certain rated pressure P (28MPa), connect the inlet of the test product to the pressure source of the pressure pulse test bench, and connect the product outlet to three pressure measuring tubes of different lengths with a four-way pipe. Connect three pressure sensors (same model, range, accuracy) to the same measurement and control software display system for verification, see Figure 2 The peak pressure meets the aviation hydraulic standard requirement of 1.28 to 1.5 times. For the peak difference, see Table 1.

[0044] Table 1 Comparison of peak differences

[0045]

[0046] After comparison, when the rated pressure is adjusted to about 28MPa and the rated pressures measured by the three lengths of pressure gauges are the same, the peak value measured by the 0.5m-long pressure gauge is about 4.4MPa lower than that by the 2.4m-long pressure gauge; the peak value measured by the 1.2m-long pressure gauge is about 4.2Mpa lower than that by the 2.4m-long pressure gauge. Figure 3 After a large number of verifications of base pressure and different piezometric tube lengths, it was found that when the piezometric tube length was (0.8-1.2) m, the peak pressure fluctuation was basically the same (controllable within the range of 0.5 MPa).

[0047] The system is provided with an oil replenishment hydraulic system, which can remove the air inside the high-pressure chamber of the boost cylinder 2, inside the test piece and inside the connecting pipe section by starting the oil replenishment hydraulic pump 6. The compressibility of the liquid and the expansion deformation of the pipeline will cause the volume of the high-pressure chamber to increase. Assuming that within time t, the pressure in the boost chamber rises to the maximum, and the pressure increases by △P. Due to the effect of △P, its volume changes by dV=△PV / Ke, where Ke is the volume elasticity parameter of the system. Therefore, within time t, V0St of oil will be replenished into this space. The more air mixed into the high-pressure chamber, the larger the compression space will be, and the longer the time t will be, which will eventually result in a lower pressure increase rate in the test. Therefore, it is necessary to exhaust the air inside the high-pressure chamber.

[0048] The upper computer controls the opening of the servo reversing valve 1. Under the action of the servo reversing valve 1, the oil flows to the low-pressure chamber of the booster cylinder 2, pushing the piston of the booster cylinder 2 to move rapidly, so that high pressure is formed between the high-pressure chamber of the booster cylinder 2 and the product. The upper computer continuously adjusts the opening size of the servo valve in different time periods and the size of the system pressure to control the formation of pulse characteristic parameters such as pressure peak value, slope, and steady-state working pressure, and forms a complete pressure pulse curve under the control of continuous pulse signals.

[0049] 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 technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A pressurized pressure pulse test system, characterized in that: It comprises a main hydraulic system, the outlet of the main hydraulic system is connected to the inlet of a servo reversing valve (1), the outlet of the servo reversing valve (1) is connected to the low-pressure chamber of the boosting cylinder (2), and the high-pressure chamber of the boosting cylinder (2) is connected to the oil replenishing hydraulic system; and it also comprises a pressure measuring tube (3) for collecting the test pressure.

2. The pressurized pressure pulse test system according to claim 1, characterized in that: The main hydraulic system comprises a main hydraulic pump (4), the outlet of the main hydraulic pump (4) being connected to the inlet of the servo reversing valve (1).

3. The pressurized pressure pulse test system according to claim 2, characterized in that: The outlet of the main hydraulic pump (4) is also connected to the oil tank (9) via a proportional relief valve A (5).

4. The pressurized pressure pulse test system according to claim 1, characterized in that: The pressure measuring tube (3) is a stainless steel tube with a diameter of 4 mm and a length of 0.8 to 1.2 m.

5. The pressurized pressure pulse test system according to claim 1, characterized in that: The oil replenishment hydraulic system connection includes an oil replenishment hydraulic pump (6), and the outlet of the oil replenishment hydraulic pump (6) is connected to the high-pressure chamber of the booster cylinder (2) through a one-way valve (7).

6. The pressurized pressure pulse test system according to claim 5, characterized in that: The outlet of the oil replenishment hydraulic pump (6) is also connected to the oil tank (9) via a proportional relief valve B (8).

7. A method for testing a boost pressure pulse test system according to any one of claims 1 to 6, characterized in that: The steps include: S1. The inlet of the test piece (10) is connected to the high-pressure chamber of the booster cylinder (2), the outlet of the test piece (10) is connected to the pressure measuring tube (3), and a pressure transmitter (11) is arranged on the pressure measuring tube (3). S2. Start the oil replenishment hydraulic system, and exhaust the gas in the booster cylinder (2) high pressure chamber, the test piece (10), the connecting line between the high pressure chamber and the test piece (10), and the pressure measuring tube (3) through the oil; S3. Start the main hydraulic system, supply oil to the low-pressure chamber of the booster cylinder (2) through the servo reversing valve (1), push the piston of the booster cylinder (2) to increase the pressure of the high-pressure chamber of the booster cylinder (2), and then increase the pressure of the test piece (10); S4. Collect data from the pressure transmitter (11) to complete the test.

8. The test method of the boost pressure pulse test system according to claim 7, characterized in that: In step S3, after the main hydraulic system is started, the upper computer electrically connected to the servo reversing valve (1) sends a servo reversing valve (1) control signal to the servo reversing valve (1), so that the pressure transmitter (11) collects the required pressure waveform.

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