CN112178007A - Super-large flow hydraulic testing device and using and testing method - Google Patents
Super-large flow hydraulic testing device and using and testing method Download PDFInfo
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- CN112178007A CN112178007A CN201910587892.2A CN201910587892A CN112178007A CN 112178007 A CN112178007 A CN 112178007A CN 201910587892 A CN201910587892 A CN 201910587892A CN 112178007 A CN112178007 A CN 112178007A
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Abstract
Provided are a super-large flow hydraulic testing device and a using and testing method. The high-pressure plunger pump comprises a pump unit, wherein the pump unit is connected with an energy accumulator group, a high-pressure leakage rate testing device and a high-flow rate testing device, the pump unit comprises a motor, the motor is connected with a high-pressure plunger pump, the high-pressure plunger pump is connected with a flexible joint, the flexible joint is connected with a butterfly valve, the high-pressure plunger pump is connected with an electromagnetic overflow valve and a high-pressure filter, the high-pressure filter is connected with a check valve, and the check valve is connected with a pressure gauge and a high-pressure ball valve. The invention is used for ultra-large flow hydraulic test.
Description
Technical Field
The invention relates to a super-large flow hydraulic testing device and a using and testing method thereof.
Background
There is no specific test set for testing the flow of very high flow hydraulic valves (Δ p 7bar Q36000L/min) across the country or even worldwide. The flow data of the ultra-high flow hydraulic valve before the present application was calculated according to a flow formula. The method comprises the steps of firstly carrying out small flow test on the ultra-large flow hydraulic valve during low pressure difference, obtaining the flow coefficient of the valve according to test data, and calculating large flow data of the ultra-large flow hydraulic valve during high pressure difference according to the flow coefficient. The data obtained by the testing method has the following defects: 1. the pure theoretical data only have reference value; 2. the deviation is relatively large: 3. the real performance of the ultra-large flow hydraulic valve under high differential pressure cannot be directly reflected.
Disclosure of Invention
The invention aims to provide an ultra-high flow hydraulic test device, an application method and a test method, which fill the gap of the flow performance test of an ultra-high flow hydraulic element and provide real and reliable test data for the flow performance of the ultra-high flow hydraulic element.
The above purpose is realized by the following technical scheme:
the ultra-large flow hydraulic testing device comprises a pump unit, wherein the pump unit is connected with an energy accumulator group, a high-pressure leakage testing device and a large-flow testing device, the pump unit comprises a motor, the motor is connected with a high-pressure plunger pump, the high-pressure plunger pump is connected with a flexible joint, the flexible joint is connected with a butterfly valve, the high-pressure plunger pump is connected with an electromagnetic overflow valve and a high-pressure filter, the high-pressure filter is connected with a check valve, and the check valve is connected with a pressure gauge and a high-pressure ball valve.
The super large flow hydraulic pressure testing arrangement, high pressure leakage volume testing arrangement include the accumulator group, last accumulator group connect down the accumulator group, last accumulator group be 3 groups, the model is 8X 50L, lower accumulator group be 2 groups, the model is 4X 50L.
The ultra-large flow hydraulic testing device comprises an AG-1 high-pressure ball valve, wherein the high-pressure ball valve AG-1 is connected with a high-pressure ball valve PG-1, the high-pressure ball valve PG-1 is connected with an ultra-large flow hydraulic valve, the ultra-large flow hydraulic valve is connected with a pressure relay, the pressure relay is connected with a throttle valve, the ultra-large flow hydraulic valve is connected with a high-pressure ball valve X-2, the ultra-large flow hydraulic valve is connected with a flowmeter, and the flowmeter is connected with a one-way valve.
The ultra-large flow hydraulic testing device comprises a front gas-liquid dual-purpose oil tank, the front gas-liquid dual-purpose oil tank is connected with a floating ball type liquid level displacement sensor, the floating ball type liquid level displacement sensor is connected with a diffuser, the diffuser is arranged on the front gas-liquid dual-purpose oil tank, the diffuser is connected with a switch valve, the switch valve is connected with an ultra-large flow hydraulic valve, the ultra-large flow hydraulic valve is connected with a pressure sensor, the pressure sensor is connected with a rear gas-liquid dual-purpose oil tank, the rear gas-liquid dual-purpose oil tank is connected with the pressure sensor, the pressure sensor is connected with a pressure gauge, the pressure gauge is connected with a lower pressure gauge, the rear gas-liquid dual-purpose oil tank is connected with a gas tank.
The use method of the ultra-large flow hydraulic test device comprises the steps that firstly, hydraulic oil is located in a front gas-liquid dual-purpose oil tank and reaches a preset liquid level, switching valves T-2, T-1, T-3, A-1, A-2, Q-4, Q-6, BX-1, P-1 and P-2 are closed, and switching valves Q-3 and Q-5 are opened; the air compressor starts to work, when the pressure of the air tank reaches a preset pressure, the switching valves P-1 and P-2 are opened, and hydraulic oil enters the rear gas-liquid oil tank through the super-large-flow hydraulic valve; when the liquid level reaches the low liquid level, the super-large flow hydraulic valve is electrified, and meanwhile, the switching valves P-1 and P-2 are closed; the circulation is an oil passing capacity test of the ultrｃA-large flow hydraulic valve P-A, and the liquid flow is calculated through the descending speed of the liquid level displacement sensor after the oil passing capacity test is completed; and after the first circulation is finished, the hydraulic oil is in a second low-pressure oil tank. At this time, the switching valves Q-3 and Q-5 are closed, and the switching valve Q-6 is opened to perform the exhaust. Opening T-1 and Q-4 after exhausting; the air compressor starts to work, when the pressure of the air tank reaches a preset pressure, the ultra-large flow hydraulic valve is electrified, the switch valves A-1 and A-2 are opened, and hydraulic oil enters the front gas-liquid dual-purpose oil tank through the ultra-large flow hydraulic valve; when the liquid level reaches a preset liquid level, the ultra-high flow hydraulic valve is de-energized, and meanwhile, the switch valves A-1 and A-2 are closed; the circulation is an oil passing capacity test of the ultra-large flow hydraulic valve A-T, and the liquid flow is calculated through a deceleration meter on the liquid level displacement sensor after the oil passing capacity test is finished; and circulating in the way, and performing liquid flow tests under different pressures.
A test method of an ultra-large flow hydraulic test device comprises a high-pressure leakage test and a low-pressure large flow test, wherein the high-pressure leakage test comprises six steps, the opening and closing conditions of all ball valves are checked through checking before the first step of test, all switch valves are installed and positioned for detection, and state detection and partial interlocking are carried out to prevent misoperation; secondly, starting the pump unit to charge the energy accumulator, electrically determining the steering direction of the motor before the motor is started, electrifying DT1, DT2 and DT3 after the steering direction is correct, charging the energy accumulator, and completing the charging when the pressure reaches 350 bar; after the punching is finished, the energy accumulator connecting ball valve is closed, the DT1, DT2 and DT3 lose power, and the system is decompressed; opening P-port high-pressure ball valves PG-1, DT1, DT2 and DT3 to obtain an electric system for boosting pressure; in ｃA P-A leakage test, ｃA pilot electromagnetic valve is electrified, an ultrｃA-large flow hydraulic valve is switched on from A to T, ｃA throttle valve A is modulated to the minimum, 5 groups of energy accumulator connecting ball valves are opened simultaneously, and signals of ｃA pressure relay and ｃA flow meter are collected; when the pressure of the energy accumulator is reduced, DT1, DT2 and DT3 lose power, the system is decompressed, and the high-pressure ball valve PG-1 is closed after the pressure is relieved; repeating the second step and the third step for multiple times of measurement; ｃA fourth step of P-T leakage test, namely skipping the third step after the second step, powering off ｃA pilot electromagnetic valve, turning on ｃA cartridge valve P-A, modulating ｃA throttle valve A to the minimum, opening high-pressure ball valves PG-1 and AG-1, collecting signals of ｃA pressure relay, ｃA temperature relay and ｃA flowmeter, stopping when the pressure of the energy accumulator is reduced, closing the high-pressure ball valves PG-1 and AG-1, repeating the second step and the fourth step, and measuring for multiple times; step five, when the oil level of the low-pressure oil tank is low, stopping the pump unit, closing BX-1, opening Q-6, opening T-2, T-3 and Q-3 until the liquid level of the low-pressure oil pipe meets the test requirements, closing Q-3, T-2 and T-3, opening Q-6 first, releasing pressure, opening BX-1, repeating the step two, the step three and the step four, and carrying out the test; the sixth step is to charge the accumulator to 350 bar.
The test method of the ultra-large flow hydraulic test device comprises four steps, wherein the low-pressure large flow test comprises four steps, the check is carried out before the first step of test, the opening and closing conditions of all ball valves are checked, all switch valves are installed, the position is detected, the state detection and partial interlocking are carried out to prevent misoperation, the first low-pressure oil tank is filled with oil, the pressure of an accumulator group is 15MPa, and the inflation pressure of a gas tank is 0.4-0.8 MPa; secondly, according to the corresponding pressure of air inflation of the air tank required by the experiment, in ｃA P-A flow test, opening ball valves Q-5, Q-3, A-1 and A-2, opening P-1 and P-2 at the same time, enabling oil to pass through ｃA valve P-A from ｃA low-pressure oil tank to ｃA low-pressure oil tank II through compressed air, enabling the liquid level of the low-pressure oil tank I to drop to ｃA 1900 stop liquid level from 1050 predicted liquid level, giving an alarm by ｃA system when the oil reaches the 1900 stop liquid level, enabling ｃA hydraulic valve with super-large flow to be electrified, closing butterfly valves P-1, P-2, A-1 and A-2, and collecting signals of ｃA pressure relay, ｃA temperature relay and ｃA liquid level displacement sensor in the; thirdly, according to the corresponding pressure of the air tank inflation required by the experiment, performing an A-T flow test, closing Q-3 and Q-5 in sequence, opening Q-6 to release pressure, opening a pilot valve Q-4 and T-1 to obtain power, simultaneously opening A-1 and A-2, enabling oil to pass through a valve A-T from a low-pressure oil tank II to a low-pressure oil tank I by compressed air, enabling the liquid level of the low-pressure oil tank I to drop from 1900 stop to 1050 stop, giving an alarm by a system when the oil reaches 1050 stop, powering off an ultra-high-flow hydraulic valve, closing butterfly valves A-1, A-2 and T-1, and collecting signals of a pressure relay, a temperature relay and a liquid level displacement sensor; fourthly, closing Q-4, A-1, A-2, T-1 and Q-6 in sequence, repeating the second step and the third step, and adjusting the inflation pressure of the gas tank according to the requirement to test the oil flow of the valve under different pressures; and (6) completing the test.
Advantageous effects
1. The invention solves the defects of the test method of the super-large flow (Q: 36000L/min) when the super-large flow hydraulic valve has the high pressure difference (delta p: 7 bar); meanwhile, the leakage rate test of high pressure (350bar) can be carried out on the ultra-large flow hydraulic test device; the real performance of the ultra-large flow at the high differential pressure of the ultra-large flow hydraulic valve is directly tested; meanwhile, the correctness of the flow formula in the case of overlarge flow is reversely verified.
2. The invention can test the leakage of the super-high flow hydraulic element at high pressure (350bar) and the super-high flow performance at low pressure (3-7bar, 36000L/min).
Drawings
Fig. 1 is a schematic diagram of the product.
Fig. 2 is a partial detailed view of fig. 1.
Fig. 3 is a pump unit schematic diagram of the super-large flow hydraulic device of the product.
Fig. 4 is a schematic diagram of the accumulator group device of the product.
Fig. 5 is a schematic diagram of a high-pressure leakage testing device of the product.
Fig. 6 is a schematic diagram of a low-pressure large-flow testing device of the product.
Fig. 7 is an external view of the diffuser of the present product.
FIG. 8 is a schematic view of the product tank level control of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
The ultra-large flow hydraulic testing device comprises a pump unit 1, wherein the pump unit is connected with an energy accumulator group 2, a high-pressure leakage testing device 3 and a large-flow testing device 4, the pump unit comprises a motor 8, the motor is connected with a high-pressure plunger pump 7, the high-pressure plunger pump is connected with a flexible joint 6, the flexible joint is connected with a butterfly valve 5, the high-pressure plunger pump is connected with an electromagnetic overflow valve 9 and a high-pressure filter 10, the high-pressure filter is connected with a check valve 11, and the check valve is connected with a pressure gauge 12 and a high-pressure ball valve 13.
A pump unit: providing a high-pressure power source, and an accumulator group: the high-pressure leakage testing system can test the 500L/mind leakage flow rate at 350bar by the accumulator group and the pump unit, and the reversing test of the ultra-large flow hydraulic valve and the pressure-resistant test of the ultra-large flow hydraulic valve are carried out under the high-pressure state. 4. Large-traffic testing arrangement: by means of an air compressor and two 5m3The air tank provides a power source, and the compressed air pushes the front gas-liquid dual-purpose oil tank (the effective volume is 6 m)3) After entering the post-gas-liquid dual-purpose oil tank through a hydraulic element (the effective volume is 6 m)3). The test capacity achieved a differential pressure Δ p of 7bar with a flow Q of 36000L/min.
Example 2
The accumulator group is composed of 3 groups of 8 multiplied by 50L accumulator groups and 2 groups of 4 multiplied by 50L accumulator groups as shown in figure 3, the capacity of the accumulator group is 3 multiplied by 8 multiplied by 50+2 multiplied by 4 multiplied by 50 which is 1600L, the high-pressure leakage rate test of the ultra-large flow hydraulic valve is carried out together with the pump unit, and meanwhile, pilot control oil is provided for a low-pressure large flow system.
Example 3
The high-pressure leakage amount testing device (as the attached figure 4) comprises a high-pressure ball valve (AG-1), a high-pressure ball valve (X-2), a high-pressure ball valve (PG-1), a flowmeter (high pressure 400bar, high precision, high flow 800L/min), a one-way valve, a super-large flow hydraulic valve and a pressure relay: detect individual business turn over hydraulic fluid port pressure, the choke valve: the buffer and pipeline during high-pressure reversing and the unloading function of high-pressure oil in the tool are realized.
The high-pressure leakage testing device, the energy accumulator group and the pump unit form a high-pressure leakage testing system, and the leakage testing of different oil inlets and oil outlets is realized through the on-off of each high-pressure ball valve. The system can test the 500L/mind discharge flow at 350bar, the reversing test of the ultra-high flow hydraulic valve at a high pressure state and the pressure test of the ultra-high flow hydraulic valve.
Example 4
The ultra-large flow hydraulic test device of embodiment 1, the large-traffic testing arrangement include preceding dual-purpose oil tank of gas-liquid 23, preceding dual-purpose oil tank of gas-liquid connect floater formula level displacement sensor 28, floater formula level displacement sensor connect diffuser 24, the diffuser dress be in preceding dual-purpose oil tank of gas-liquid, the diffuser connect switch valve 25, the switch valve connect ultra-large flow hydrovalve 26, the ultra-large flow hydrovalve connect pressure sensor 27, pressure sensor connect back dual-purpose oil tank of gas-liquid 33, back dual-purpose oil tank of gas-liquid connect pressure sensor 32, pressure sensor connect manometer 31, the manometer connect down manometer 30, back dual-purpose oil tank of gas-liquid connect gas pitcher 29, the gas pitcher connect silencer 22.
The low-pressure large-flow testing device (as shown in the attached figure 5) comprises a silencer: the noise generated when the compressed gas is exhausted is eliminated during the exhaust, and meanwhile, the air-water separator is also a channel for free circulation of the inside and outside air of the oil tank when the liquid level of the oil tank rises; gas-liquid dual-purpose oil tank: the design pressure of the oil tank is 10bar, the working pressure is 8bar, and the volume is 6.24m3And the inner diameter is 1800 mm. The gas-liquid dual-purpose oil tank is provided with two identical oil tanks which are respectively numbered as a low-pressure oil tank I (a front gas-liquid dual-purpose oil tank) and a low-pressure oil tank II (a rear gas-liquid dual-purpose oil tank). Both tank inlet and outlet ports are equipped with diffusers (see fig. 6) to reduce oil level fluctuations. One of the oil tanks is provided with a liquid level displacement sensor, and the change of the liquid level is detected through the change of the displacement sensor. And the top of the oil tank is provided with two ball valves of DN150, one ball valve is connected with a silencer, and the other ball valve is connected with an air tank. The 4 ball valves are used for controlling gas inlet and outlet of the two oil tanks, and the pressure tank and the oil storage tank are switched back and forth; a diffuser (under large flow, the oil liquid impact is buffered, the liquid level fluctuation is reduced, and the opening direction of the diffuser is inclined downwards); switch valves (serial numbers X-1, T-2, T-1, T-3, Q-4, Q-5, Q-6, BX-1, A-2, P-1, P-2); an ultra-high flow hydraulic valve; the pressure sensor (measuring range 0-16bar) calculates the differential pressure through the pressure sensor; float ball type liquid level displacement sensor (effective range 2000 mm): the common liquid level sensor can not resist pressure, and a high-precision pressure-resistant displacement sensor is modified (a magnetic ring of an in-situ displacement sensor is replaced by a floating ball with a coil); gas tank (design pressure 10bar, use pressure 8bar, volume 5 m)3) The two gas tanks are connected in parallel and then are respectively connected with a low-pressure oil tank I and a low-pressure oil tank II; an air compressor: volume flow rate6.26m3The/min power is 37kW, and the working pressure is 0.8 MPa; a pressure gauge: the measuring range is 0-1.6MPa to display the pressure of the gas tank; a pressure sensor: the tank pressure is monitored.
Example 5
The use method of the ultra-large flow hydraulic test device comprises the steps that firstly, hydraulic oil is located in a front gas-liquid dual-purpose oil tank and reaches a preset liquid level, switching valves T-2, T-1, T-3, A-1, A-2, Q-4, Q-6, BX-1, P-1 and P-2 are closed, and switching valves Q-3 and Q-5 are opened; the air compressor starts to work, when the pressure of the air tank reaches a preset pressure, the switching valves P-1 and P-2 are opened, and hydraulic oil enters the rear gas-liquid oil tank through the super-large-flow hydraulic valve; when the liquid level reaches the low liquid level, the super-large flow hydraulic valve is electrified, and meanwhile, the switching valves P-1 and P-2 are closed; the circulation is an oil passing capacity test of the ultrｃA-large flow hydraulic valve P-A, and the liquid flow is calculated through the descending speed of the liquid level displacement sensor after the oil passing capacity test is completed; and after the first circulation is finished, the hydraulic oil is in a second low-pressure oil tank. At this time, the switching valves Q-3 and Q-5 are closed, and the switching valve Q-6 is opened to perform the exhaust. Opening T-1 and Q-4 after exhausting; the air compressor starts to work, when the pressure of the air tank reaches a preset pressure, the ultra-large flow hydraulic valve is electrified, the switch valves A-1 and A-2 are opened, and hydraulic oil enters the front gas-liquid dual-purpose oil tank through the ultra-large flow hydraulic valve; when the liquid level reaches a preset liquid level, the ultra-high flow hydraulic valve is de-energized, and meanwhile, the switch valves A-1 and A-2 are closed; the circulation is an oil passing capacity test of the ultra-large flow hydraulic valve A-T, and the liquid flow is calculated through a deceleration meter on the liquid level displacement sensor after the oil passing capacity test is finished; and circulating in the way, and performing liquid flow tests under different pressures.
Calculating a liquid flow formula:
wherein Q-the flow through the valve port (m)3S), C α -flow coefficient, A-flow area of valve port (m)2) Rho-liquid Density, kg/m3(at 700-900) Δ p-pressure drop (N/m) across the valve port2)。
Example 6
A test method of an ultra-large flow hydraulic test device comprises the test step of the ultra-large flow hydraulic test device, the ultra-large flow hydraulic test is divided into a high-pressure leakage test and a low-pressure large-flow test, and the test is carried out by referring to a schematic diagram of the ultra-large flow hydraulic test device during the test.
The high-pressure leakage test comprises six steps,
the method comprises the steps of checking before a first step of test, checking the opening and closing conditions of all ball valves, (the switching valves BX-1-BX-4 and T-1 are opened, the switching valves P-1, P-2, A-1 and A-2 are closed, the switching valves Q-1, Q-3 and Q-4 are closed, Q-5 and Q-6 are opened, the oil return ball valves T-2 and T-3 are closed, the pump outlet switching valves BC-1, BC-2 and BC-3 are opened, the inlet and outlet ball valves of an energy accumulator are opened, the oil control ball valve X-1 is closed, the X-2 is opened, and the P outlet ball valves PG-1 and AG-1 of the ultra-large flow hydraulic valve are closed), detecting the installation positions of all the switching valves, and performing state detection and partial interlocking to prevent misoperation.
Secondly, starting the pump unit to charge the energy accumulator, electrically determining the steering direction of the motor before the motor is started, electrifying DT1, DT2 and DT3 after the steering direction is correct, charging the energy accumulator, and completing the charging when the pressure reaches 350 bar; after the punching is finished, the energy accumulator connecting ball valve is closed, the DT1, DT2 and DT3 lose power, and the system is decompressed; and opening the P-port high-pressure ball valves PG-1, DT1, DT2 and DT3 to boost the pressure of the electric system.
In ｃA P-A leakage test, ｃA pilot electromagnetic valve is electrified, an ultrｃA-large flow hydraulic valve is switched on from A to T, ｃA throttle valve A is modulated to the minimum, 5 groups of energy accumulator connecting ball valves are opened simultaneously, and signals of ｃA pressure relay and ｃA flow meter are collected; when the pressure of the energy accumulator is reduced to a certain pressure, DT1, DT2 and DT3 lose power, the system is decompressed, and the high-pressure ball valve PG-1 is closed after the pressure is relieved; and repeating the second step and the third step for a plurality of times of measurement.
ｃA fourth step of P-T leakage test, namely skipping the third step after the second step, powering off ｃA pilot electromagnetic valve, switching on ｃA cartridge valve P-A, modulating ｃA throttle valve A to the minimum, opening high-pressure ball valves PG-1 and AG-1, and collecting signals of ｃA pressure relay, ｃA temperature relay and ｃA flow meter; stopping when the pressure of the energy accumulator is reduced by a certain pressure, and closing the high-pressure ball valves PG-1 and AG-1; and repeating the second step and the fourth step for multiple times of measurement.
Fifthly, when the oil level of the low-pressure oil tank is low, stopping the pump unit, closing BX-1, Q-6, opening T-2, T-3 and Q-3 until the liquid level of the low-pressure oil pipe 2 meets the test requirements, closing Q-3, T-2 and T-3, opening Q-6 first and releasing pressure to open BX-1; and repeating the second step, the third step and the fourth step to carry out the test.
The sixth step is to charge the accumulator to 350 bar.
Note that opening the A-port high-pressure ball valve AG-1 is strictly forbidden during high-pressure testing.
Example 7
The test method of the ultra-large flow hydraulic test device in embodiment 6, the low-pressure large flow test includes four steps, the check before the first step of the test is to check the opening and closing conditions of each ball valve, (the switching valves T-1A-1, a-2, BX-1-BX-4 are closed, the switching valves P-1, P-2 are closed, the switching valve Q-1 is opened, Q-3, Q-4, Q-5, Q-6 are closed, the oil return ball valves T-2, T-3 are closed, the pump outlet ball valves BC-1, BC-2, BC-3 are closed, the accumulator inlet and outlet ball valves are all opened, the control oil ball valve X-1 is opened, the X-2 is closed, and the cartridge valve P outlet ball valves PG-1, AG-1 are closed), and there is state detection and partial interlock to prevent malfunction; the first low-pressure oil tank is filled with oil, and the pressure of the accumulator group is 15 MPa; the air pressure of the air tank is 0.4-0.8 MPa.
Secondly, inflating the gas tank to corresponding pressure according to the experiment requirement; in the P-A flow test, the Q-5, Q-3, A-1 and A-2 ball valves are opened, and the P-1 and P-2 valves are opened at the same time; the oil liquid flows from ｃA low-pressure oil tank to ｃA low-pressure oil tank II through ｃA valve P-A by compressed air, the liquid level of the low-pressure oil tank I is reduced to ｃA 1900 stop liquid level from ｃA 1050 predicted liquid level, when the oil liquid reaches the 1900 stop liquid level, ｃA system alarms, and the super-large flow hydraulic valve is electrified to close butterfly valves P-1, P-2, A-1 and A-2; and signals of a pressure relay, a temperature relay and a liquid level displacement sensor are collected in the oil level descending process.
Inner diameter of the oil tank: 1800 mm; volume of 1mm oil tank: pi r2L3.14 x 900 x 1 x 2.543L; total volume of oil liquid reduction: 850 × 2.543 ═ 2161.55L.
In the third step, the liquid level is decreased at the maximum flow rate of 35000L/min, the collection time 2161.55 × 60/35000 is 3.7s of the liquid level of the oil tank, and the liquid level is shown in the attached figure 7. According to the experiment, the gas tank is inflated to corresponding pressure; in the A-T flow test, Q-3 and Q-5 are closed in sequence, Q-6 is firstly opened to release pressure, the pilot valve Q-4 and T-1 are opened to be electrified, and A-1 is opened simultaneously,A-2; the oil liquid is sent to the first low-pressure oil tank from the second low-pressure oil tank through a valve A-T by compressed air, the liquid level of the first low-pressure oil tank is reduced from 1900 stop liquid level to 1050 stop, the system alarms when the oil liquid reaches 1050 stop liquid level, the super-large flow hydraulic valve is de-energized, and butterfly valves A-1, A-2 and T-1 are closed; and signals of a pressure relay, a temperature relay and a liquid level displacement sensor are collected. Inner diameter of the oil tank: 1800mm, 1mm tank volume: pi r2L3.14 x 900 x 1 x 2.543L; total volume of oil liquid reduction: 750 × 2.543 ═ 1907.25L; the liquid level drop collection time 1907.25 × 60/11000 is 10.4s at the maximum valve flow rate of 11000L/min.
Fourthly, closing Q-4, A-1, A-2, T-1 and Q-6 in sequence, and repeating the second step and the third step; and adjusting the inflation pressure of the gas tank as required to test the oil flow of the valve under different pressures, and completing the test.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (9)
1. The ultra-large flow hydraulic testing device comprises a pump unit and is characterized in that the pump unit is connected with an energy accumulator group, a high-pressure leakage testing device and a large-flow testing device, the pump unit comprises a motor, the motor is connected with a high-pressure plunger pump, the high-pressure plunger pump is connected with a flexible joint, the flexible joint is connected with a butterfly valve, the high-pressure plunger pump is connected with an electromagnetic overflow valve and a high-pressure filter, the high-pressure filter is connected with a one-way valve, and the one-way valve is connected with a pressure gauge and a high-pressure ball valve.
2. The ultra-large flow hydraulic test device according to claim 1, wherein the high-pressure leakage test device comprises an upper accumulator group, the upper accumulator group is connected with a lower accumulator group, the upper accumulator group is 3 groups and has a model of 8 x 50L, and the lower accumulator group is 2 groups and has a model of 4 x 50L.
3. The ultra-large flow hydraulic test device according to claim 1, wherein the high-pressure leakage test device comprises an AG-1 high-pressure ball valve, the high-pressure ball valve AG-1 is connected with a high-pressure ball valve PG-1, the high-pressure ball valve PG-1 is connected with an ultra-large flow hydraulic valve, the ultra-large flow hydraulic valve is connected with a pressure relay, the pressure relay is connected with a throttle valve, the ultra-large flow hydraulic valve is connected with a high-pressure ball valve X-2, the ultra-large flow hydraulic valve is connected with a flow meter, and the flow meter is connected with a one-way valve.
4. The ultra-high flow hydraulic test device according to claim 1, wherein the high flow test device comprises a front dual-purpose oil tank, the front dual-purpose oil tank is connected with a floating ball type liquid level displacement sensor, the floating ball type liquid level displacement sensor is connected with a diffuser, the diffuser is arranged in the front dual-purpose oil tank, the diffuser is connected with a switch valve, the switch valve is connected with an ultra-high flow hydraulic valve, the ultra-high flow hydraulic valve is connected with a pressure sensor, the pressure sensor is connected with a rear dual-purpose oil tank, the rear dual-purpose oil tank is connected with a pressure sensor, the pressure sensor is connected with a pressure gauge, the pressure gauge is connected with a lower pressure gauge, the rear dual-purpose oil tank is connected with an air tank, and the air tank is connected with a silencer.
5. The use method of the ultra-large flow hydraulic test device is characterized in that firstly, hydraulic oil is in a front gas-liquid dual-purpose oil tank and reaches a preset liquid level, switching valves T-2, T-1, T-3, A-1, A-2, Q-4, Q-6, BX-1, P-1 and P-2 are closed, and switching valves Q-3 and Q-5 are opened; the air compressor starts to work, when the pressure of the air tank reaches a preset pressure, the switching valves P-1 and P-2 are opened, and hydraulic oil enters the rear gas-liquid oil tank through the super-large-flow hydraulic valve; when the liquid level reaches the low liquid level, the super-large flow hydraulic valve is electrified, and meanwhile, the switching valves P-1 and P-2 are closed; the circulation is an oil passing capacity test of the ultrｃA-large flow hydraulic valve P-A, and the liquid flow is calculated through the descending speed of the liquid level displacement sensor after the oil passing capacity test is completed; and after the first circulation is finished, the hydraulic oil is in a second low-pressure oil tank.
6. At this time, the switching valves Q-3 and Q-5 are closed, and the switching valve Q-6 is opened to perform the exhaust.
7. Opening T-1 and Q-4 after exhausting; the air compressor starts to work, when the pressure of the air tank reaches a preset pressure, the ultra-large flow hydraulic valve is electrified, the switch valves A-1 and A-2 are opened, and hydraulic oil enters the front gas-liquid dual-purpose oil tank through the ultra-large flow hydraulic valve; when the liquid level reaches a preset liquid level, the ultra-high flow hydraulic valve is de-energized, and meanwhile, the switch valves A-1 and A-2 are closed; the circulation is an oil passing capacity test of the ultra-large flow hydraulic valve A-T, and the liquid flow is calculated through a deceleration meter on the liquid level displacement sensor after the oil passing capacity test is finished; and circulating in the way, and performing liquid flow tests under different pressures.
8. The test method of the hydraulic test device with the ultra-large flow is characterized by comprising a high-pressure leakage test and a low-pressure large-flow test, wherein the high-pressure leakage test comprises six steps, the opening and closing conditions of all ball valves are checked through checking before the first step of test, the installation positions of all switch valves are detected, and the state detection and the partial interlocking are carried out to prevent misoperation; secondly, starting the pump unit to charge the energy accumulator, electrically determining the steering direction of the motor before the motor is started, electrifying DT1, DT2 and DT3 after the steering direction is correct, charging the energy accumulator, and completing the charging when the pressure reaches 350 bar; after the punching is finished, the energy accumulator connecting ball valve is closed, the DT1, DT2 and DT3 lose power, and the system is decompressed; opening P-port high-pressure ball valves PG-1, DT1, DT2 and DT3 to obtain an electric system for boosting pressure; in ｃA P-A leakage test, ｃA pilot electromagnetic valve is electrified, an ultrｃA-large flow hydraulic valve is switched on from A to T, ｃA throttle valve A is modulated to the minimum, 5 groups of energy accumulator connecting ball valves are opened simultaneously, and signals of ｃA pressure relay and ｃA flow meter are collected; when the pressure of the energy accumulator is reduced, DT1, DT2 and DT3 lose power, the system is decompressed, and the high-pressure ball valve PG-1 is closed after the pressure is relieved; repeating the second step and the third step for multiple times of measurement; ｃA fourth step of P-T leakage test, namely skipping the third step after the second step, powering off ｃA pilot electromagnetic valve, turning on ｃA cartridge valve P-A, modulating ｃA throttle valve A to the minimum, opening high-pressure ball valves PG-1 and AG-1, collecting signals of ｃA pressure relay, ｃA temperature relay and ｃA flowmeter, stopping when the pressure of the energy accumulator is reduced, closing the high-pressure ball valves PG-1 and AG-1, repeating the second step and the fourth step, and measuring for multiple times; step five, when the oil level of the low-pressure oil tank is low, stopping the pump unit, closing BX-1, opening Q-6, opening T-2, T-3 and Q-3 until the liquid level of the low-pressure oil pipe meets the test requirements, closing Q-3, T-2 and T-3, opening Q-6 first, releasing pressure, opening BX-1, repeating the step two, the step three and the step four, and carrying out the test; the sixth step is to charge the accumulator to 350 bar.
9. The test method of the ultra-large flow hydraulic test device according to claim 6, wherein the low-pressure large flow test comprises four steps, the check before the first step of test is to check the opening and closing conditions of each ball valve, the installation position of each switch valve is detected, and the state detection and the partial interlocking are performed to prevent the misoperation, the first low-pressure oil tank is full of oil, the pressure of the accumulator group is 15MPa, and the inflation pressure of the gas tank is 0.4-0.8 MPa; secondly, according to the corresponding pressure of air inflation of the air tank required by the experiment, in ｃA P-A flow test, opening ball valves Q-5, Q-3, A-1 and A-2, opening P-1 and P-2 at the same time, enabling oil to pass through ｃA valve P-A from ｃA low-pressure oil tank to ｃA low-pressure oil tank II through compressed air, enabling the liquid level of the low-pressure oil tank I to drop to ｃA 1900 stop liquid level from 1050 predicted liquid level, giving an alarm by ｃA system when the oil reaches the 1900 stop liquid level, enabling ｃA hydraulic valve with super-large flow to be electrified, closing butterfly valves P-1, P-2, A-1 and A-2, and collecting signals of ｃA pressure relay, ｃA temperature relay and ｃA liquid level displacement sensor in the; thirdly, according to the corresponding pressure of the air tank inflation required by the experiment, performing an A-T flow test, closing Q-3 and Q-5 in sequence, opening Q-6 to release pressure, opening a pilot valve Q-4 and T-1 to obtain power, simultaneously opening A-1 and A-2, enabling oil to pass through a valve A-T from a low-pressure oil tank II to a low-pressure oil tank I by compressed air, enabling the liquid level of the low-pressure oil tank I to drop from 1900 stop to 1050 stop, giving an alarm by a system when the oil reaches 1050 stop, powering off an ultra-high-flow hydraulic valve, closing butterfly valves A-1, A-2 and T-1, and collecting signals of a pressure relay, a temperature relay and a liquid level displacement sensor; fourthly, closing Q-4, A-1, A-2, T-1 and Q-6 in sequence, repeating the second step and the third step, and adjusting the inflation pressure of the gas tank according to the requirement to test the oil flow of the valve under different pressures; and (6) completing the test.
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| CN112797037A (en) * | 2021-02-26 | 2021-05-14 | 太重集团榆次液压工业(济南)有限公司 | Continuous pressurization system with adjustable pressurization rate and control method thereof |
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