A test system and method for a liquid sprayer

Abstract

This invention discloses a spray nozzle testing system and method, relating to the field of spray nozzle testing. The system includes a main oil tank, which is sequentially connected to an inlet valve block in a clamping device via multiple parallel main oil pumps, an electromagnetic overflow valve, a proportional overflow valve, an accumulator, and an electromagnetic two-way cartridge valve. This inlet valve block allows communication with the spray nozzle mounted on it. The clamping device also includes an outlet valve block, within which the spray nozzle sprays liquid. The outlet of the outlet valve block is connected to a calibration inlet pipe via a mass flow meter. A switching device switches the connection between the outlet of the calibration inlet pipe and the main oil tank. The calibration oil tank is placed on an electronic balance, and the liquid inside is returned to the main oil tank via a return pump. A differential pressure gauge is installed on the outlet valve block, and a thermometer is installed on the inlet valve block. This invention can test the parameter stability, constant flow measurement time, and constant time flow measurement performance of the spray nozzle.

Description

Technical Field

[0001] This invention relates to the field of sprayer testing, and in particular to a sprayer testing system and method. Background Technology

[0002] Injectors are key components for spraying liquids. As a crucial actuator in the fuel supply system of modern internal combustion engines, they precisely meter, atomize, and inject fuel at a moving pressure to specific locations within the engine. Injector testing is a critical step in ensuring their performance, reliability, and injection parameters.

[0003] Current injector testing systems are relatively mature. For example, Chinese patent CN219101494U discloses an experimental platform for injector calibration, which integrates a liquid injection pulse simulator, a high-pressure rail tube, and dual measuring cylinders, and has the advantage of supporting real-time calibration of injector opening / closing pressure. Another example is Chinese patent CN01239722U, which discloses a digital diesel engine injector test bench, which uses a combination of pressure sensors and a microcontroller to replace mechanical pressure gauges and achieve digital memory of the injection start pressure. However, current technical solutions all have drawbacks such as insufficient flow regulation capability, poor pressure stability, cumbersome calibration procedures, and cumbersome manual operation.

[0004] Therefore, there is an urgent need to develop a wide flow coverage, high stability, and fully automated sprayer testing system. Summary of the Invention

[0005] The purpose of this invention is to provide a liquid sprayer testing system and method to address the aforementioned problems. This system achieves wide flow coverage, high-precision and stable control, full-process automation, and safe and reliable operation of the liquid sprayer, significantly improving testing efficiency and data reliability. It is suitable for mass production testing and R&D verification of various types of liquid sprayers.

[0006] The technical solution adopted in this invention is as follows: A sprayer testing system includes a main oil tank, the oil outlet of which is connected to multiple main oil pumps connected in parallel. The oil outlet of each main oil pump 13 is connected to the oil inlet of an electromagnetic overflow valve 14 via a one-way valve. The oil outlet of the electromagnetic overflow valve 14 is connected to an accumulator 8. The accumulator has a proportional overflow valve at its oil port, and the overflow ports of both the electromagnetic overflow valve and the proportional overflow valve are connected to the main oil tank. The oil port of the accumulator is connected to the oil inlet valve block in a clamping device via an electromagnetic two-way cartridge valve, enabling communication with a sprayer mounted on the oil inlet valve block. The clamping device also includes an oil outlet valve block that can be moved away from or closer to the oil inlet valve block. The oil outlet of the oil outlet valve block is directly opposite the oil inlet valve block, and the oil outlet valve block is mounted on a drive device that can drive the oil outlet valve block away from or closer to the oil inlet valve block; the oil outlet of the oil outlet valve block is connected to a mass flow meter, and the outlet of the mass flow meter is connected to the calibration oil inlet pipe in the switching device. The switching device is installed between the calibration oil tank and the main oil tank and is used to switch the oil outlet of the calibration oil inlet pipe between being connected to the calibration oil tank and being connected to the main oil tank. The calibration oil tank is placed on an electronic balance, and the interior of the calibration oil tank is connected to the main oil tank through a return oil pipe. A return oil pump is installed on the return oil pipe; a differential pressure gauge is installed on the oil outlet valve block, and a thermometer is installed on the oil inlet valve block.

[0007] Furthermore, there is at least one filter between the electromagnetic overflow valve and the accumulator, and the filtration accuracy of the filter gradually increases along the direction of liquid flow.

[0008] Furthermore, the oil inlet valve block is equipped with a clamping fixture component one, which has a positioning port, the axis of which is collinear with the axis of the oil outlet of the oil inlet valve block; the oil outlet valve block is equipped with a clamping fixture component two, which has a positioning sleeve, the axis of which is collinear with the axis of the oil inlet of the oil outlet valve block; the positioning sleeve and the positioning port are collinear with each other and move parallel to the direction of movement of the oil outlet valve block away from or towards the oil inlet valve block, so that the positioning port and the positioning sleeve can cooperate to clamp the sprayer installed on the oil inlet valve block.

[0009] Furthermore, the clamping device also includes a bracket, which has a guide rod whose axis is parallel to the axis of the positioning sleeve or positioning port; the driving device is mounted on the bracket, and a guide plate is provided on the output shaft of the driving device, the guide rod passes through the guide plate, and the oil outlet valve block is mounted on the guide plate; an upper limit member and a lower limit member are installed on the guide rod, and the guide plate is located between the upper limit member and the lower limit member.

[0010] Furthermore, a check valve is provided between the oil outlet valve block and the mass flow meter.

[0011] Furthermore, the switching device includes a switching driver and a flow divider. The flow divider has two flow channels, one of which is connected to the calibration oil tank and the other is connected to the main oil tank. The calibration oil inlet pipe is installed on the output shaft of the switching driver, and the two flow channels are arranged on the movement path of the calibration oil inlet pipe.

[0012] Furthermore, it also includes an oil temperature controller, whose oil inlet and outlet are both connected to the main oil tank.

[0013] Furthermore, the main oil tank is equipped with a circulating oil port, which is connected to the oil inlet section of the return oil pump; a filter device is installed at the location where the return oil pipe connects to the main oil tank.

[0014] Furthermore, a venting bypass is provided on the return oil pipe, and a venting valve is provided on the venting bypass.

[0015] A method for testing a liquid injector, using the aforementioned liquid injector testing system, sequentially performs four test items: stability test, standard component test, constant flow rate measurement over time, and / or constant flow rate measurement over time, including the following steps: S1: Stability test, including steps S11-S14; S11: Install the standard sprayer on the clamping fixture component one, start the drive device, and the drive device will move the clamping fixture component two toward the clamping fixture component one, so as to cooperate with the clamping fixture component one to clamp the standard sprayer and complete the clamping and installation of the standard sprayer. S12: Based on the flow rate of the standard injector, start the required main oil pump. The main oil pump draws liquid from the main oil tank and sends it into the solenoid overflow valve. After the excess liquid is overflowed by the solenoid overflow valve, the remaining liquid passes through multiple filters, proportional overflow valve, accumulator, and solenoid two-way valve before entering the standard injector. S13: After the liquid oil enters the standard sprayer, the standard sprayer starts spraying liquid. The spraying time is determined. During this spraying time, the temperature of the liquid before entering the standard sprayer is obtained by a thermometer, and the pressure difference of the liquid oil before and after the standard sprayer is measured by a differential pressure gauge. It is determined whether the temperature and the pressure difference of the liquid oil can be stabilized within the required range. If they exceed the required range, the cause is investigated and adjusted until they can be stabilized within the required range. S14: In step S1, the liquid sprayed from the standard injector flows back to the main oil tank through the oil outlet valve block, mass flow meter, and calibrated oil inlet pipe. S2: Based on step S13, standard parts testing is performed to check whether the standard sprayer meets the requirements in terms of time-flow rate relationship. If it does not meet the requirements, the cause is investigated and adjusted until the time-flow rate relationship meets the requirements. This indicates that the standard sprayer test system is qualified and subsequent standard sprayer sample testing can be carried out. S21: In step S2 above, the liquid oil sprayed from the standard injector flows into the calibration oil tank through the oil outlet valve block and the calibration oil inlet pipe. The accuracy of the calibration mass flow meter is verified by obtaining the liquid mass through an electronic balance. S3: Based on step S2, replace the standard sprayer with a sprayer sample, and perform constant flow rate measurement for time and / or constant time flow rate measurement on the sprayer sample, including steps S31-S33. S31: Constant flow rate and time measurement. The mass of liquid oil sprayed from the sprayer sample is obtained through a mass flow meter. The actual time required for the cumulative mass of liquid oil sprayed from the sprayer sample to reach the target mass is measured. The actual time is compared with the required standard time. If it is within the tolerance range of the standard time, the sprayer sample is deemed qualified; if it exceeds the tolerance range of the standard time, the sprayer sample is deemed unqualified. S32: Flow rate measurement at fixed intervals. The mass of liquid sprayed from the sprayer sample is obtained through a mass flow meter. The actual mass of liquid oil sprayed from the sprayer sample within a specified time is determined. The actual mass is compared with the required standard mass. If it is within the tolerance range of the standard mass, the sprayer sample is deemed qualified; if it exceeds the tolerance range of the standard mass, the sprayer sample is deemed unqualified. S33: In step S3 above, the liquid sprayed from the sprayer sample flows back to the main oil tank through the oil outlet valve block, mass flow meter, and calibration oil inlet pipe.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention achieves precise control of flow rate over a wide range by connecting multiple main oil pumps in parallel, with one main oil pump capable of variable flow rate adjustment; 2. This invention reduces liquid pressure pulsation through an accumulator, thereby improving system stability; 3. This invention employs a dual-redundancy protection mechanism, which uses an electromagnetic overflow valve to set a safe pressure threshold and a proportional overflow valve to precisely control the differential pressure of the injector, in conjunction with an accumulator to improve the safety and compatibility of the system. Attached Figure Description

[0017] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the oblique two-side view of the test system; Figure 2 This is a top view of the test system; Figure 3 This is a side view of the test system; Figure 4 This is a schematic diagram of the clamping device from two oblique sides; Figure 5 This is a front view schematic diagram of the clamping device; Figure 6 This is a schematic diagram of the switching device from two oblique sides; The markings in the diagram are: 1-Main oil tank; 2-Switching device; 3-Calibration inlet pipe; 4-Drive device; 5-Clamping device; 6-Calibration oil tank; 7-Return pipe; 8-Accumulator; 9-Solenoid two-way cartridge valve; 10-Proportional relief valve; 11-Filter; 12-Control assembly; 13-Main oil pump; 14-Solenoid relief valve; 15-Mass flow meter; 16-Oil temperature controller; 17-Electronic balance; 18-Return pump; 19-Bracket; 20-Outlet valve block; 21-Inlet valve block; 22-Thermometer; 23-Clamping fixture component one; 24-Differential pressure gauge; 25-Guide plate; 26-Guide rod; 27-Clamping fixture component two; 28-Positioning sleeve; 29-Switching driver; 30-Diverter; 31-Flow channel. Detailed Implementation

[0018] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0019] Furthermore, the use of terms such as "horizontal" or "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0020] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; it can be a connection within two components.

[0021] Example 1 like Figures 1-6As shown, a liquid injector testing system includes a main oil tank 1. The outlet of the main oil tank 1 is connected to three main oil pumps 13 connected in parallel. Two of the main oil pumps 13 are driven by fixed-frequency motors, and their output flow rates are fixed. The third main oil pump 13 is driven by a variable-frequency motor. By changing the input frequency of the variable-frequency motor, the output flow rate of the third main oil pump 13 can be changed. In actual operation, depending on the different flow rate requirements of different liquid injectors, one main oil pump 13 or two or three main oil pumps 13 can be selected to work simultaneously. The output flow rate can be adjusted by the main oil pump 13 driven by the variable-frequency motor to meet different flow rate requirements. For example, the single pump output flow rate of the two main oil pumps 13 driven by the fixed-frequency motor is 140 L / min, while the motor frequency of the main oil pump 13 driven by the variable-frequency motor can be 20 Hz-50 Hz, and the output flow rate can vary within the range of 80 L / min-200 L / min.

[0022] In this embodiment, if the main oil pump 13 has a self-unloading port, the self-unloading port can be connected to the main oil tank 1 to realize oil return; the test system preferably has a main oil pump 13 with a self-unloading port, which can release pressure when the pressure is reduced or the machine is stopped, thus avoiding pressure shock to the entire system.

[0023] In this embodiment, the outlet of each main oil pump 13 is connected to the inlet of the electromagnetic relief valve 14 via a check valve. When the electromagnetic relief valve 14 is energized, it closes, and the corresponding main oil pump 13 builds pressure. When the electromagnetic relief valve 14 is de-energized, it opens, and the corresponding main oil pump 13 depressurizes. Therefore, the electromagnetic relief valve 14 is used for pressure building and unloading control of the liquid at the outlet of the main oil pump 13, as well as setting the safety pressure to prevent the pump outlet pressure from exceeding the safety pressure, thereby protecting all hydraulic components in the system. A pressure sensor can be installed at the inlet of the electromagnetic relief valve 14 to obtain the liquid pressure of the corresponding main oil pump 13.

[0024] It should be noted that, since this scheme involves multiple pumps operating in parallel, a check valve is added to prevent liquid from flowing back from the non-operating pumps to the oil tank. This prevents liquid pressure from backflushing the pumps, avoids damage to the pumps by the liquid, and ensures the effective establishment of liquid pressure.

[0025] In this embodiment, the oil outlet of the electromagnetic overflow valve 14 is connected to the accumulator 8. The oil outlet of the accumulator 8 has a proportional overflow valve 10. The oil outlet of the accumulator 8 is connected to the oil inlet valve block 21 in the clamping device 5 through an electromagnetic two-way cartridge valve 9, and can communicate with the injector installed on the oil inlet valve block 21. The accumulator 8 is mainly used to eliminate liquid pressure pulsations, making the pressure before and after the injector more stable, thus ensuring the accuracy of the injector flow rate test. It should be noted that the accumulator 8 needs to be pre-charged with nitrogen before normal operation. The pressure of nitrogen can be 8-9 MPa; the accumulator 8 has a pressure relief ball valve, which is mainly used to relieve the pressure of the liquid in the accumulator 8. When the accumulator 8 is working normally, its pressure relief ball valve is in the closed state. It is only necessary to open this pressure relief ball valve when troubleshooting and maintenance; the proportional relief valve 10 is used to precisely control the pressure difference before and after the injector; the solenoid two-way cartridge valve 9 is mainly used to control the passage of liquid into the injector. When the solenoid two-way cartridge valve 9 is energized and in the open state, liquid can enter the injector. In this embodiment, the clamping device 5 also includes an oil outlet valve block 20 that can move away from or closer to the oil inlet valve block 21. The oil inlet of the oil outlet valve block 20 is directly opposite the oil inlet valve block 21, and the oil outlet valve block 20 is mounted on a driving device 4 that can drive the oil outlet valve block 20 away from or closer to the oil inlet valve block 21. The clamping device 5 is mainly used to clamp the sprayer under test to prevent the nozzle from being pushed out by the oil pressure and causing external spraying during the test. Specifically, the liquid from the electromagnetic two-way cartridge valve 9 enters the sprayer. When the sprayer sprays out liquid, it is subjected to the thrust generated by the liquid pressure, causing the sprayer to fall off the installation position. Therefore, the clamping device 5 is used to clamp the spray nozzle, and the clamping force needs to be greater than the thrust of the liquid on the sprayer. The liquid sprayed out by the sprayer enters the oil outlet valve block 20 and flows back from the oil outlet valve block 20 to the main oil tank 1.

[0026] In this embodiment, the oil outlet of the oil outlet valve block 20 is connected to a mass flow meter 15. The mass flow meter 15 obtains the mass flow rate of the liquid flowing out of the oil outlet valve block 20, and thus obtains the mass flow rate of the liquid sprayed by the sprayer. The outlet of the mass flow meter 15 is connected to the calibration oil inlet pipe 3 in the switching device 2. The switching device 2 is installed between the calibration oil tank 6 and the main oil tank 1, and is used to switch the oil outlet of the calibration oil inlet pipe 3 between being connected to the calibration oil tank 6 and being connected to the main oil tank 1. The calibration oil tank 6 is placed on the electronic balance 17, and the flow is controlled by an electric current meter. The sub-balance 17 obtains the liquid mass flow rate to verify the accuracy of the mass flow meter 15; the interior of the calibration oil tank 6 is connected to the main oil tank 1 through the return oil pipe 7, and the return oil pipe 7 is equipped with a return oil pump 18, which returns the liquid in the calibration oil tank 6 to the main oil tank 1; a differential pressure gauge 23 is installed on the oil outlet valve block 20, and a thermometer 22 is installed on the oil inlet valve block 21. The differential pressure gauge 23 is used to detect the pressure difference between the inlet and outlet of the sprayer, and the thermometer 22 is used to obtain the liquid temperature at the inlet of the sprayer.

[0027] In this embodiment, all sensors capable of acquiring data (such as mass flow meter 15, differential pressure gauge 23, thermometer 22, etc.) and actuators capable of performing related actions based on signals (main oil pump 13, electromagnetic relief valve 14, proportional relief valve 10, electromagnetic two-way cartridge valve 9, electronic balance 17, and actuators in clamping device 5 and switching device 2, etc.) can be connected to the control assembly 12. The control assembly 12 acquires sensor data and controls the actuators to achieve automation. Furthermore, the control assembly 12 is a human-machine interface assembly composed of a PLC controller and a PC.

[0028] In summary, the above-mentioned testing system can effectively test the sprayer.

[0029] Example 2 Based on Example 1, further feasible implementation methods are proposed.

[0030] In one feasible implementation, at least one filter 11 exists between the electromagnetic overflow valve 14 and the accumulator 8, such as two filters 11. The filtration accuracy of the filters 11 gradually increases along the direction of liquid flow. Specifically, along the direction of liquid flow, the filtration accuracy of the first filter 11 is 10μm, and the filtration accuracy of the second filter 11 is 5μm, achieving step-by-step filtration and reducing the filtration pressure of the filters 11. The filters 11 mainly clean the liquid by filtration, and the filtration accuracy is gradually improved, which can ensure the filtration accuracy while reducing the filtration intensity of each filter 11. By setting up filters, the main purpose is to protect the subsequent valves and actuators and prevent clogging.

[0031] In one feasible implementation, the overflow ports of both the electromagnetic overflow valve 14 and the proportional overflow valve 10 are connected to the main oil tank 1 to achieve overflow return oil.

[0032] It should be noted that the opening degree of the overflow port of the electromagnetic overflow valve 14 and the proportional overflow valve 10 can be controlled by the control assembly 12 to achieve overflow pressure control.

[0033] In one feasible implementation, the inlet valve block 21 is equipped with a clamping fixture component 23, which has a positioning port. The axis of the positioning port is collinear with the axis of the outlet port of the inlet valve block 21. The outlet valve block 20 is equipped with a clamping fixture component 27, which has a positioning sleeve 28. The axis of the positioning sleeve 28 is collinear with the axis of the inlet port of the outlet valve block 20. The positioning sleeve 28 is collinear with the axis of the positioning port and parallel to the outlet valve. Block 20 moves away from and towards the oil inlet valve block 21 so that the positioning tube port and the positioning tube sleeve 28 can cooperate to clamp the injector installed on the oil inlet valve block 21. Using this tooling, when installing the injector, the injector can be directly put on the positioning tube port. Then, under the drive of the drive device 4, the clamping tooling component 27 moves towards the clamping tooling component 23 until the positioning tube sleeve 28 is put on the injector, realizing the stacked installation of the injector and ensuring the stability of the installation position of the injector.

[0034] Furthermore, both clamping fixture component 1 23 and clamping fixture component 27 can be respectively mounted on the oil inlet valve block 21 and the oil outlet valve block 20 by screws.

[0035] In one feasible implementation, the clamping device 5 further includes a bracket 19, which has a guide rod 26, the axis of which is parallel to the axis of the positioning sleeve 28 or the positioning port; the driving device 4 is mounted on the bracket 19, and a guide plate 25 is provided on the output shaft of the driving device 4, through which the guide rod 26 passes, and the oil outlet valve block 20 is mounted on the guide plate 25; an upper limit member and a lower limit member are mounted on the guide rod 26, and the guide plate 25 is located between the upper limit member and the lower limit member; the driving device 4 can... The actuator 4 can be a pneumatic cylinder, a linear motor, or a hydraulic cylinder. If the actuator 4 is a pneumatic cylinder, its intake and exhaust valves can be connected to the control assembly 12 to automate the extension and retraction of the cylinder. The pneumatic cylinder can be selected with a working pressure of 0.6MPa-0.9MPa. When the working pressure is 0.6MPa, the clamping force generated is 12KN. This working parameter can cope with the thrust of a large number of sprayers, ensuring that the thrust is less than the clamping force of the cylinder, thereby ensuring the stability of the sprayer position.

[0036] In this embodiment, the cooperation of the guide plate 25 and the guide rod 26 stabilizes the movement direction of the oil outlet valve block 20, thereby ensuring that the clamping fixture component 27 on the oil outlet valve block 20 can stably clamp the injector. The upper and lower limit components limit the stroke of the oil outlet valve block 20. The upper limit component determines whether the cylinder piston is fully retracted, and the lower limit component detects whether the cylinder piston has extended to the position where the injector is pressed. Feasibly, both the upper and lower limit components can be electromagnetic induction switches, which can be connected to the control assembly 12. The signals detected by the limit switches are fed back to the electronic control system. The program determines whether the spray nozzle is in a clamped or released state. If no corresponding state is detected, the control assembly 12 will control the entire system to stop further operation. For example, if the control assembly 12 does not receive a signal from the upper limit switch, it means that the spray nozzle may be completely released. In this case, the spray nozzle cannot be disassembled to prevent damage caused by the spray nozzle not being completely released. Similarly, if the control assembly 12 does not receive a signal from the lower limit switch, it means that the spray nozzle is not clamped. In this case, the system cannot open the solenoid two-way cartridge valve 9, so that liquid cannot enter the spray nozzle for spraying, thus ensuring the safety of the spray nozzle. It should be noted that if different models of sprayers are replaced, the positions of the upper and lower limit components can be adjusted, and clamping fixture component 1 23 and clamping fixture component 27 with different geometric dimensions can be replaced to meet the installation requirements of the sprayer. Therefore, clamping fixture component 1 23 and clamping fixture component 27 can be detached by screw installation, and the upper and lower limit components can also be locked onto the guide rod 26 by clamping.

[0037] In one feasible implementation, a check valve is provided between the oil outlet valve block 20 and the mass flow meter 15 to prevent oil from flowing back out of the return line when the injector is picked up or put down.

[0038] In one feasible implementation, the switching device 2 includes a switching driver 29 and a flow divider 30. The flow divider 30 has two flow channels 31, one of which is connected to the calibration oil tank 6, and the other is connected to the main oil tank 1. The calibration oil inlet pipe 3 is mounted on the output shaft of the switching driver 29, and the two flow channels 31 are arranged on the movement path of the calibration oil inlet pipe 3. The spatial position of the calibration oil inlet pipe 3 is adjusted by the switching driver 29 so that the oil outlet of the calibration oil inlet pipe 3 is directly opposite the two flow channels 31. If any one of the flow channels 31 is directly connected to the main oil tank 1, the liquid sprayed from the injector enters the main oil tank 1 through the oil outlet valve block 20 and the mass flow meter 15. This is the main flow path of the liquid when testing the injector sample. If the flow channel 31 is directly connected to the calibration oil tank 6, the liquid sprayed from the injector enters the calibration oil tank 6 through the oil outlet valve block 20 and the mass flow meter 15. This is the main flow path of the liquid when using a standard injector to verify and calibrate the system.

[0039] Furthermore, the switching driver 29 can be a linear motor, or a cylinder or hydraulic cylinder; the switching driver 29 can be connected to the control assembly 12 to achieve automated control.

[0040] One feasible implementation also includes an oil temperature controller 16, whose oil inlet and outlet are both connected to the main oil tank 1. The oil temperature controller 16 and the main oil tank 1 form a separate liquid circulation loop, and the oil temperature controller 16 can be used to maintain the liquid temperature in the main oil tank 1.

[0041] In one feasible implementation, the main oil tank 1 is provided with a circulation port, which is connected to the oil inlet section of the return oil pump 18; a filter device is provided at the position where the return oil pipe 7 connects to the main oil tank 1; the circulation port, the return oil pump 18 and the main oil tank 1 form a separate liquid circulation loop, so that the liquid in the main oil tank 1 circulates between the main oil tank 1 and the return oil pump 18, and is filtered by the filter device to avoid excessive impurities in the liquid, and further reduces the pressure of the filter 11 on the liquid filtration.

[0042] In one feasible implementation, a venting bypass is provided on the return oil pipe 7, and a venting valve is provided on the venting bypass for venting the liquid in the main oil tank 1.

[0043] Example 3 A method for testing a liquid injector, using the liquid injector testing system described in any one of the embodiments of Examples 1-2, sequentially performs four test items: stability test, standard component test, constant flow rate measurement over time and / or constant flow rate measurement over time, including the following steps: S1: Stability test, including steps S11-S14; S11: Install the standard sprayer on the clamping fixture component 23, start the drive device 4, the drive device 4 moves the clamping fixture component 27 toward the clamping fixture component 23, and cooperates with the clamping fixture component 23 to clamp the standard sprayer, thus completing the clamping and installation of the standard sprayer. S12: Based on the flow rate of the standard injector, start the required main oil pump 13. The main oil pump 13 draws liquid from the main oil tank 1 and sends it into the electromagnetic overflow valve 14. After the excess liquid is overflowed by the electromagnetic overflow valve 14, the remaining liquid passes through multiple filters 11, proportional overflow valve 10, accumulator 8, and electromagnetic two-way valve in sequence before entering the standard injector. S13: After the liquid oil enters the standard sprayer, the standard sprayer starts spraying liquid. The spraying time is determined. During this spraying time, the temperature of the liquid before entering the standard sprayer is obtained by thermometer 22, and the pressure difference of the liquid oil before and after the standard sprayer is measured by differential pressure gauge 23. It is determined whether the temperature and the pressure difference of the liquid oil can be stabilized within the required range. If they exceed the required range, the cause is investigated and adjusted until they can be stabilized within the required range. S14: In step S1, the liquid sprayed from the standard injector flows back to the main oil tank 1 through the oil outlet valve block 20, the mass flow meter 15, and the calibrated oil inlet pipe 3.

[0044] As can be seen from step S1, step S1 mainly verifies that the liquid temperature and pressure difference can be kept stable during system operation, which is the basis for the subsequent test verification environment of the sprayer sample.

[0045] S2: Based on step S13, standard parts testing is performed to check whether the standard sprayer meets the requirements in terms of time-flow rate relationship. If it does not meet the requirements, the cause is investigated and adjusted until the time-flow rate relationship meets the requirements. This indicates that the standard sprayer test system is qualified and subsequent standard sprayer sample testing can be carried out. S21: In step S2 above, the liquid oil sprayed from the standard injector flows into the calibration oil tank 6 through the oil outlet valve block 20 and the calibration oil inlet pipe 3. The liquid mass is obtained by the electronic balance 17 to verify the accuracy of the calibration mass flow meter 15.

[0046] As can be seen from step S2, step S2 mainly focuses on the accuracy of the mass flow meter 15, providing an accurate data acquisition basis for obtaining mass flow rate during subsequent sprayer sample testing.

[0047] S3: Based on step S2, replace the standard sprayer with a sprayer sample, and perform constant flow rate measurement for time and / or constant time flow rate measurement on the sprayer sample, including steps S31-S33. S31: Constant flow rate and time measurement. The mass of liquid oil sprayed from the sprayer sample is obtained through mass flow meter 15. The actual time required for the cumulative mass of liquid oil sprayed from the sprayer sample to reach the target mass is measured. The actual time is compared with the required standard time. If it is within the tolerance range of the standard time, the sprayer sample is deemed qualified; if it exceeds the tolerance range of the standard time, the sprayer sample is deemed unqualified. S32: Flow rate is measured at fixed intervals. The mass of liquid sprayed from the sprayer sample is obtained through mass flow meter 15. The actual mass of liquid oil sprayed from the sprayer sample within a specified time is determined. The actual mass is compared with the required standard mass. If it is within the tolerance range of the standard mass, the sprayer sample is deemed qualified; if it exceeds the tolerance range of the standard mass, the sprayer sample is deemed unqualified. S33: In step S3 above, the liquid sprayed from the sprayer sample flows back to the main oil tank 1 through the oil outlet valve block 20, the mass flow meter 15, and the calibration oil inlet pipe 3.

[0048] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A liquid sprayer testing system, characterized in that: The device includes a main oil tank (1), the outlet of which is connected to multiple parallel main oil pumps (13). The outlet of each main oil pump (13) is connected to the inlet of an electromagnetic overflow valve (14) via a check valve. The outlet of the electromagnetic overflow valve (14) is connected to an accumulator (8). The accumulator (8) has a proportional overflow valve (10) at its oil port. The overflow ports of both the electromagnetic overflow valve (14) and the proportional overflow valve (10) are connected to the main oil tank (1). The oil port of the accumulator (8) is connected to the inlet valve block (21) in the clamping device (5) via an electromagnetic two-way cartridge valve (9), and can communicate with the sprayer installed on the inlet valve block (21). The clamping device (5) also includes an outlet valve block (20) that can be moved away from or close to the inlet valve block (21). The inlet of the outlet valve block (20) is directly opposite the inlet valve block (21), and the outlet valve... Block (20) is assembled on a drive device (4) that can drive the oil outlet block (20) away from and close to the oil inlet block (21); the oil outlet of the oil outlet block (20) is connected to a mass flow meter (15), and the outlet of the mass flow meter (15) is connected to the calibration inlet pipe (3) in the switching device (2). The switching device (2) is installed between the calibration oil tank (6) and the main oil tank (1) to switch the oil outlet of the calibration inlet pipe (3) between being connected to the calibration oil tank (6) and being connected to the main oil tank (1). The calibration oil tank (6) is placed on an electronic balance (17). The interior of the calibration oil tank (6) is connected to the main oil tank (1) through a return oil pipe (7). A return oil pump (18) is installed on the return oil pipe (7); a differential pressure gauge (23) is installed on the oil outlet block (20), and a thermometer (22) is installed on the oil inlet block (21).

2. The sprayer testing system according to claim 1, characterized in that: There is at least one filter (11) between the electromagnetic overflow valve (14) and the accumulator (8), and the filtration accuracy of the filter (11) gradually increases along the direction of liquid flow.

3. The sprayer testing system according to claim 1, characterized in that: The oil inlet valve block (21) is equipped with a clamping fixture component one (23), which has a positioning port. The axis of the positioning port is collinear with the axis of the oil outlet of the oil inlet valve block (21). The oil outlet valve block (20) is equipped with a clamping fixture component two (27), which has a positioning sleeve (28). The axis of the positioning sleeve (28) is collinear with the axis of the oil inlet of the oil outlet valve block (20). The positioning sleeve (28) is collinear with the axis of the positioning port and moves parallel to the oil outlet valve block (20) away from and towards the oil inlet valve block (21), so that the positioning port and the positioning sleeve (28) can clamp the sprayer installed on the oil inlet valve block (21).

4. The sprayer testing system according to claim 3, characterized in that: The clamping device (5) further includes a bracket (19), which has a guide rod (26). The axis of the guide rod (26) is parallel to the axis of the positioning sleeve (28) or the positioning port. The driving device (4) is mounted on the bracket (19). A guide plate (25) is provided on the output shaft of the driving device (4). The guide rod (26) passes through the guide plate (25). The oil outlet valve block (20) is mounted on the guide plate (25). An upper limit member and a lower limit member are installed on the guide rod (26). The guide plate (25) is located between the upper limit member and the lower limit member.

5. The sprayer testing system according to claim 3, characterized in that: A one-way valve is provided between the oil outlet valve block (20) and the mass flow meter (15).

6. The sprayer testing system according to claim 1, characterized in that: The switching device (2) includes a switching driver (29) and a distributor (30). The distributor (30) has two flow channels (31), one of which is connected to the calibration oil tank (6) and the other is connected to the main oil tank (1). The calibration oil inlet pipe (3) is installed on the output shaft of the switching driver (29), and the two flow channels (31) are arranged on the movement path of the calibration oil inlet pipe (3).

7. The sprayer testing system according to claim 1, characterized in that: It also includes an oil temperature controller (16), whose oil inlet and outlet are connected to the main oil tank (1).

8. The sprayer testing system according to claim 1, characterized in that: The main oil tank (1) is equipped with a circulating oil port, which is connected to the oil inlet section of the return oil pump (18); a filter device is installed at the position where the return oil pipe (7) is connected to the main oil tank (1).

9. The sprayer testing system according to claim 8, characterized in that: The return oil pipe (7) is provided with a venting bypass, and the venting bypass has a venting valve.

Images