Precise alternating pressure testing device and testing method

Abstract

The invention discloses a precise alternating pressure testing device and method. The testing device comprises a hydraulic pump station, a high-temperature medium oil tank, a servo supercharger, a high-low temperature testing box and a bidirectional pressure flow guide block. According to the scheme, the temperature is controlled in a flow divider valve block double-channel indirect heating mode, the bidirectional pressure flow guide module is used, liquid circulation is forced by means of pressure alternation, the temperature uniformity in the medium test process is improved, and the waveform and control precision in the test process are improved. The pressure and temperature flowing states of the aerospace hydraulic guide pipe in actual working conditions are simulated to the maximum extent, and an accurate basis is provided for evaluating the performance of the aerospace hydraulic guide pipe.

Description

Technical Field

[0001] The present invention belongs to the field of aerospace hydraulic conduit testing, and specifically relates to a precision alternating pressure testing device and a testing method, which are used for performing a precision alternating pressure test on a hydraulic conduit under high temperature conditions. Background Art

[0002] The existing aerospace hydraulic catheter alternating pressure test equipment has increasingly higher requirements for the waveform and control accuracy of the pressure alternating test. The traditional switch valve to control the pressure shock can no longer meet the test requirements. In order to improve the stable pressure control under various waveforms during the pressure alternating test, servo booster cylinders, servo valves, and closed pressure test chambers are used to improve the pressure control accuracy. The volume of the variable chamber of the booster cylinder connected to the inner cavity of the test piece is changed through the movement of the booster cylinder piston, thereby realizing pressure alternation.

[0003] However, the existing structure has the following problems: 1. It is impossible to ensure that the medium temperature in the test piece is uniform; 2. When testing the specimen, the pressure change needs to strictly follow the corresponding requirements. The existing structure is open, which is achieved by pressurization and pressure relief, and the pressure cannot be guaranteed to be accurate.

[0004] 3. During the test, the medium is in an open state, which can easily mix in impurities and affect the test, and may leak out and cause pollution. Summary of the invention

[0005] The object of the present invention is to provide a precise alternating pressure medium temperature circulation method to solve the problems in the prior art.

[0006] The present invention is realized by the following technical scheme: a precision alternating pressure test device, characterized in that it comprises a hydraulic pump station, a high-temperature medium oil tank, a servo booster, a high-temperature test chamber and a bidirectional pressure guide block; The hydraulic pump station includes a hydraulic oil pump; The high temperature medium oil tank is provided with a heating pipe and a liquid replenishing oil pump, and the liquid replenishing oil pump is connected to the specimen fixing manifold in the high and low temperature test box through a pipeline; The servo booster includes a booster cylinder, which is connected to a hydraulic oil pump via a servo reversing valve; The high and low temperature test chamber is provided with a specimen fixing manifold for fixing the specimen, and both ends of the specimen fixing manifold are respectively connected to the bidirectional pressure guide block through pipelines; The bidirectional pressure guide block includes a guide valve body, and an oil suction valve and an oil discharge valve are arranged at the left and right ends of the guide valve body, and the oil suction valve and the oil discharge valve are respectively connected to the two ends of the specimen fixing manifold; the upper end of the guide valve body is connected to the liquid replenishing oil pump, and the lower end of the guide valve body is connected to the boosting cylinder; a jacket is arranged on the guide valve body, and the jacket is connected to the high-temperature medium oil tank.

[0007] Furthermore: the upper end of the specimen fixing manifold is connected to the high-temperature medium oil tank, and the lower end is connected to the oil return pipe; a pressure sensor and a temperature sensor are also arranged on the specimen fixing manifold.

[0008] Furthermore: a high pressure sensor is arranged at the front end of the boost cylinder.

[0009] The present invention also discloses a precision alternating pressure testing method, which uses the precision alternating pressure testing device as described above, and is characterized in that it comprises the following steps: S1, install and fix the test piece and the test piece fixing manifold, and fill the guide valve body and the test piece with hydraulic oil through the hydraulic oil pump; S2, continuously introduce high temperature oil in the high temperature medium oil tank into the jacket; S3, controls the pressure in the guide valve body through the booster cylinder, so that it can perform high and low pressure reciprocating cycles as required.

[0010] The solution described in the present invention adopts the double-channel indirect heating method of the diverter valve block to control the temperature, uses a bidirectional pressure diversion module, and uses pressure alternation to force liquid circulation, thereby improving the temperature uniformity during the medium test process, and improving the waveform and control accuracy during the test process. It simulates the pressure and temperature flow state of the aerospace hydraulic conduit in actual working conditions to the maximum extent, providing an accurate basis for evaluating its performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the overall structure diagram of the present invention; Figure 2 It is a partial structural schematic diagram of the present invention; Figure 3 It is the pressure variation curve during the test process of the present invention.

[0012] Explanation of the serial numbers in the figure: 1- hydraulic pump station; 2- high temperature medium oil tank; 3- servo booster; 4- high and low temperature test chamber; 5- bidirectional pressure guide block.

[0013] 101-Hydraulic oil pump; 102-Proportional back pressure valve; 103-One-way valve; 104-High pressure filter; 105-Back pressure accumulator; 106-System pressure sensor; 107-Return oil cooler; 108-Return oil filter; 201-Heating pipe; 202-Fluid replenishing oil pump; 203-Circulating oil pump; 204-One-way valve; 205-Filter; 206-One-way valve; 207-Return oil valve; 208-Return oil pipe; 301-Boosting cylinder; 302-High pressure sensor; 303-Servo reversing valve; 304-High pressure port accumulator; 305-Low pressure port accumulator; 401-Specimen fixing manifold; 402-Pressure sensor; 403-Temperature sensor; 501-Diversion valve body; 502-Suction valve; 503-Oil discharge valve. DETAILED DESCRIPTION

[0014] like Figure 1 The figure shows a precision alternating pressure test device of the present invention, which comprises a hydraulic pump station 1, a high-temperature medium oil tank 2, a servo booster 3, a high-temperature and low-temperature test chamber 4 and a bidirectional pressure guide block 5; The hydraulic pump station 1 provides hydraulic pressure to the booster cylinder, and includes a hydraulic oil pump 101 connected to the booster cylinder; The high-temperature medium oil tank 2 is used to initially add high-temperature oil to the specimen, and to circulate high-temperature oil into the jacket of the specimen manifold during subsequent testing to ensure the temperature inside the specimen; a heating pipe 201 and a liquid replenishing oil pump 202 are arranged therein, and the liquid replenishing oil pump 202 is connected to the specimen fixing manifold 401 in the high and low temperature test box 4 through a pipeline; The servo booster 3 includes a booster cylinder 301, which is connected to the hydraulic oil pump 101 through a servo reversing valve 303; the booster cylinder has a function of adjusting pressure, and has a piston inside. The inner side of the piston is the oil chamber of the booster cylinder, and the outer side of the piston is the oil chamber connected to the guide valve body. Through the function of the servo reversing valve, the left oil chamber can be filled with oil or drained, and the volume of the right oil chamber can be adjusted through the piston, thereby adjusting the pressure in the guide valve body to achieve alternating pressure; The high and low temperature test box 4 is arranged outside the test piece to keep the temperature. A test piece fixing manifold 401 for fixing the test piece is placed inside the test piece. Both ends of the test piece fixing manifold 401 are connected to the bidirectional pressure guide block 5 through pipelines. The bidirectional pressure guide block 5 includes a guide valve body 501, and an oil suction valve 502 and an oil discharge valve 503 are arranged at the left and right ends of the guide valve body 501, and the oil suction valve 502 and the oil discharge valve 503 are respectively connected to the two ends of the specimen fixing manifold 401; the upper end of the guide valve body 501 is connected to the liquid replenishing oil pump 202, and the lower end of the guide valve body 501 is connected to the booster cylinder 301; a jacket is arranged on the guide valve body 501, and the jacket is connected to the high-temperature medium oil tank 2.

[0015] Preferably, the upper end of the specimen fixing manifold 401 is connected to the high-temperature medium oil tank 2 , and the lower end is connected to the oil return pipe 208 ; a pressure sensor 402 and a temperature sensor 403 are also provided on the specimen fixing manifold 401 .

[0016] Preferably, a high pressure sensor 302 is provided at the front end of the boosting cylinder 301 (the end close to the guide valve body).

[0017] Preferably: a proportional back pressure valve 102, a one-way valve 103, a high-pressure filter 104, a back pressure accumulator 105, and a system pressure sensor 106 are sequentially arranged on the pipeline connecting the hydraulic oil pump and the booster cylinder; an oil return cooler 107 and an oil return filter 108 are sequentially arranged on the pipeline from the booster cylinder to the hydraulic pump station; a high-pressure accumulator 304 and a low-pressure accumulator 305 are respectively arranged at the oil inlet and the oil return port near the servo reversing valve 303.

[0018] Preferably: a heating pipe 201 is provided in the high-temperature medium oil tank for heating the medium; a liquid replenishing oil pump 202 and a circulating oil pump 203 are also provided; the liquid replenishing oil pump 202 is connected to the guide valve body through a pipeline, and is used to inject the medium into it initially or replenish it when needed midway, and a one-way valve 206 is provided on the pipeline between the liquid replenishing oil pump and the guide valve body; the circulating oil pump is connected to the jacket through a pipeline and discharges the oil into the high-temperature medium oil tank through the return oil pipe 208, and the temperature of the specimen can be maintained during the test through circulation, and a one-way valve 204 and a filter 205 are provided on the pipeline connecting the circulating oil pump and the jacket; a return oil branch pipe is provided on the pipeline connecting the specimen fixing manifold and the inlet end of the guide valve body, and an oil return valve 207 is provided on the return oil branch pipe. The return oil valve can play a role of exhaust when oil is filled in the initial state, and can also be used as an emergency oil discharge pressure relief.

[0019] Preferably: there are two sets of specimen fixing manifolds, such as Figure 2 As shown in the figure, the left and right sides are divided into main pipes and auxiliary pipes. The manifold is provided with multiple groups of installation fixed ports connected to the test pieces. The fixed ports are equipped with valves and can be closed automatically. The two ends of the medium passage inside the main pipe are connected to the outside and the middle is disconnected, forcing the medium to flow through the test piece to the auxiliary pipe and then to the lower end of the main pipe through the test piece to ensure that the corresponding pressure is reached in the test piece.

[0020] The present invention also discloses a precision alternating pressure testing method, which uses the precision alternating pressure testing device as described above and comprises the following steps: S1, install and fix the test piece and the test piece fixing manifold, and fill the guide valve body and the test piece with high-temperature hydraulic oil through the hydraulic oil pump; S2, continuously supplying high temperature oil in the high temperature medium oil tank into the jacket through a circulating oil pump; S3, control the pressure in the guide valve body through the booster cylinder to make it perform high and low pressure reciprocating cycles as required until the number of alternations required by the fatigue test is reached or the specimen is damaged.

[0021] When the boost cylinder is pressurized, the pressure in the guide valve body increases, the left check valve closes, the right check valve opens, and the medium flows from the right side (with Figure 1 The medium enters the test piece (taking the direction shown as an example) for a high-pressure test; when the boost cylinder reverses, the pressure in the guide valve body decreases, the right-side one-way valve is closed, the left-side one-way valve is turned on, and the medium returns from the test piece to the guide valve body, and the test piece is subjected to a low-pressure test; during the entire test process, the medium always runs in a clockwise direction, that is, during the entire test process, the medium is flowing, thereby achieving uniform and controllable temperature.

[0022] The present invention is an alternating pressure testing device for aviation hydraulic pipes with medium temperature. It can perform alternating pressure testing on aviation pipelines with medium temperature, realize water hammer, sine, triangle, trapezoidal wave and other pressure waveform control, and take into account a series of functions such as medium recovery and temperature control during the test, so as to more strictly ensure the test conditions and strictly evaluate the product performance.

[0023] The solution described in the present invention adopts the indirect heating method of the double flow channel of the guide valve block to control the temperature, uses a two-way pressure guide module, and uses pressure alternation to force liquid circulation, thereby improving the temperature uniformity during the medium test process, and improving the waveform and control accuracy during the test process. The flow state of pressure and temperature of the aerospace hydraulic conduit in actual working conditions is simulated to the maximum extent, providing an accurate basis for evaluating its performance. During the test, except for the initial state, the medium is in a closed environment, is not affected by the outside world, does not enter impurities, and has a small temperature change.

[0024] like Figure 3 As shown, when testing the specimen, the pressure curve of this scheme has small fluctuation and good repeatability between multiple cycles, that is, the test is stable.

[0025] Embodiment: A precision alternating pressure test device is used to implement an alternating pressure test of the medium temperature of an aviation hydraulic pipe, which includes a hydraulic pump station 1, a high-temperature medium oil tank 2, a servo booster 3, a high and low temperature test box 4, and a bidirectional pressure guide block 5; the hydraulic pump station sucks the oil from the oil tank through a hydraulic oil pump 101 to adjust the system pressure through a proportional back pressure valve 102, prevents the oil from flowing back when the motor stops through a one-way valve 103, ensures the cleanliness of the oil output through a high-pressure filter 104, eliminates the pressure change caused by flow fluctuations through a back pressure accumulator 105, and a system pressure sensor 106 is used to measure the system pressure, and the return oil The cooler 107 is used to cool the oil to ensure the continuous operation of the system; the return oil filter 108 is used to ensure the cleanliness of the return oil; the high-temperature medium oil tank is responsible for the oil temperature control by the heating pipe 201, the replenishing oil pump 202 is used to fill the high-pressure circuit and the test piece with the test medium oil, and the return oil valve 207 returns the high-temperature medium tank, and the circulating oil pump 203 continuously flows the oil back to the high-temperature medium oil tank through the temperature circulation oil circuit through the one-way valve 204, the filter 205, the one-way valve 206 and the return oil pipe 208, so as to continuously bring heat to the test piece fixed manifold; the servo booster mainly includes a booster cylinder 301 used to increase the system pressure to the test piece The test piece is provided with the required test pressure. The pressure increase ratio is related to the area ratio. The high-pressure sensor 302 is used for monitoring the pressure of the test piece and transmitting the signal to the servo reversing valve 303 to control the pressure of the booster cylinder system. The high-pressure port accumulator 304 and the low-pressure port accumulator 305 are used for compensating the servo reversing flow rate. The high and low temperature test chamber includes a test piece fixed manifold 401 for test piece installation. The fixed manifold contains a pressure pipeline and a temperature circulation pipeline. The pressure pipeline is used for pressure transmission. The temperature pipeline is located in the jacket and is a low-pressure pipeline used to indirectly heat the fixed manifold. The pressure sensor 402 and the temperature sensor 403 are used for the pressure of the test piece. Direct measurement of force and temperature; the two-way pressure guide block is the core component of the invention, the guide valve body 501 is a high-strength four-outlet valve block, which is divided into a liquid replenishing port, a pressure supply port, an oil discharge port, and an oil suction port. The liquid replenishing port and the pressure supply port are at the middle node of the oil suction valve 502 and the oil discharge valve 503. As the pressure of the pressure supply port changes, a pressure difference is generated between the pressure supply port and the manifold. When the pressure supply port is high, the oil discharge port is opened, the oil suction port is closed, and the oil is discharged from the oil discharge port. When the oil supply port is low, the oil suction port is opened, the oil discharge port is closed, and the oil returns from the manifold. As the pressure of the oil supply port changes, the oil in the entire high-pressure pipeline continues to circulate, realizing rapid and uniform temperature transfer.

Claims

1. A precision alternating pressure testing device, characterized in that: It comprises a hydraulic pump station (1), a high-temperature medium oil tank (2), a servo booster (3), a high-temperature and low-temperature test chamber (4) and a bidirectional pressure guide block (5); The hydraulic pump station (1) comprises a hydraulic oil pump (101); The high-temperature medium oil tank (2) is provided with a heating pipe (201) and a liquid replenishing oil pump (202), and the liquid replenishing oil pump (202) is connected to a specimen fixing manifold (401) in the high and low temperature test chamber (4) through a pipeline; The servo booster (3) comprises a booster cylinder (301), and the booster cylinder (301) is connected to the hydraulic oil pump (101) via a servo reversing valve (303); A specimen fixing manifold (401) for fixing the specimen is arranged in the high and low temperature test chamber (4), and both ends of the specimen fixing manifold (401) are connected to the bidirectional pressure guide block (5) through pipelines respectively; The bidirectional pressure guide block (5) comprises a guide valve body (501), and an oil suction valve (502) and an oil discharge valve (503) are arranged at the left and right ends of the guide valve body (501), and the oil suction valve (502) and the oil discharge valve (503) are respectively connected to the two ends of the specimen fixing manifold (401); the upper end of the guide valve body (501) is connected to the liquid replenishing oil pump (202), and the lower end of the guide valve body (501) is connected to the boosting cylinder (301); and a jacket is arranged on the guide valve body (501), and the jacket is connected to the high-temperature medium oil tank (2).

2. A precision alternating pressure testing device according to claim 1, characterized in that: The upper end of the specimen fixing manifold (401) is connected to the high-temperature medium oil tank (2), and the lower end is connected to the oil return pipe (208); a pressure sensor (402) and a temperature sensor (403) are also provided on the specimen fixing manifold (401).

3. A precision alternating pressure testing device according to claim 1, characterized in that: A high pressure sensor (302) is provided at the front end of the boosting cylinder (301).

4. A precision alternating pressure testing method, using the precision alternating pressure testing device as claimed in claim 1, characterized in that: The steps include: S1, install and fix the test piece and the test piece fixing manifold, and fill the guide valve body and the test piece with hydraulic oil through the hydraulic oil pump; S2, continuously introduce high temperature oil in the high temperature medium oil tank into the jacket; S3, controls the pressure in the guide valve body through the booster cylinder, so that it can perform high and low pressure reciprocating cycles as required.

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