Flow performance testing device

Abstract

A flow performance testing device comprises a medium box, a temperature sensor and an absolute pressure sensor are arranged in the medium box, an oil suction filter is connected to an oil suction port of the medium box, and an outlet of the oil suction filter is connected with a screw flowmeter through a pipeline, a first low-temperature bevel gear pump and a first pneumatic ball valve. The low-temperature bevel gear pump and the screw flowmeter are adopted, the applicable viscosity range of the low-temperature bevel gear pump is 10-20000 cst, the temperature range is-40-200 DEG C, when the low-temperature viscosity of a medium reaches 9000 cst, the controller is matched with the current temperature and flow to calculate the viscosity, and then the rotating speed of the low-temperature bevel gear pump is adjusted, so that the required flow can be normally output; the viscosity range of the screw flowmeter is between 10 cst and 250000 cst, the temperature range is between-40 DEG C and-210 DEG C, the application range is wide, the precision is high, the test requirements can be met, and correct data can be obtained.

Description

Technical Field

[0001] The invention relates to the field of physics, and in particular to a flow performance testing device for an automobile engine gearbox oil suction filter and an electric drive filter, in particular to a flow performance testing device. Background Art

[0002] In the differential pressure test of the corresponding flow rate of the oil suction filter of the automobile engine transmission and the electric drive filter in the high and low temperature range (-40 to 150°C) of the ATF transmission gear oil, the detection equipment used in the prior art is a gear pump and a gear flow meter. The gear pump is a delivery pump, and the gear flow meter is a measuring device. The pressure at both ends of the test piece is detected by an absolute pressure sensor and a differential pressure sensor to obtain pressure and flow data to determine whether the filter meets the filtering effect required by the product. However, the gear pump cannot output the flow rate normally when the low-temperature viscosity reaches 9000cst, and the gear flow meter cannot detect the flow rate normally when the low-temperature viscosity reaches 9000cst, which affects the test results. Summary of the invention

[0003] The purpose of the present invention is to provide a flow performance testing device, which is intended to solve the technical problem in the prior art that the gear pump cannot output flow normally when the low-temperature viscosity reaches 9000cst, and the gear flow meter cannot detect flow normally when the low-temperature viscosity reaches 9000cst, thereby affecting the test results of the oil suction filter and the electric drive filter.

[0004] A flow performance testing device of the present invention comprises a medium box, wherein a temperature sensor and an absolute pressure sensor are arranged in the medium box, and the medium box is provided with an oil suction port, wherein a mounting seat is arranged at the oil suction port, and a filter mounting groove is arranged in the mounting seat, wherein one end of the filter mounting groove is communicated with the outlet of the medium box, and the other end of the filter mounting groove is connected with the first end of a screw flowmeter through a pipeline, a first low-temperature helical gear pump, and a first pneumatic ball valve, the first low-temperature helical gear pump and the first pneumatic ball valve are connected in parallel with a second low-temperature helical gear pump and a second pneumatic ball valve, and a regulating valve is also connected in parallel, a first pressure sensor is arranged on the pipeline between the first pneumatic ball valve and the screw flowmeter, and the second end of the screw flowmeter is connected with a first pressure sensor through the pipeline, the second pressure sensor, and the first pressure sensor. The first end of the three-way ball valve is connected, the second end of the first three-way ball valve is connected to the first end of a second three-way ball valve, the third end of the first three-way ball valve is connected to the first end of a pipeline filter test piece, the second end of the pipeline filter test piece is connected to the second end of the second three-way ball valve, the first end of the pipeline filter test piece is also connected to the first end of a differential pressure sensor through a pipeline and a first solenoid valve, the second end of the pipeline filter test piece is also connected to the second end of the differential pressure sensor through a pipeline and a second solenoid valve, the third end of the second solenoid valve is connected to the inlet of the medium box through a pipeline and an electric regulating ball valve, and the electric regulating ball valve is connected in parallel with a third pneumatic ball valve, a bypass filter, and a one-way valve; the outlet of the medium box is connected to the inlet of the medium box through a pipeline and a heating device;

[0005] The control ends of the first cryogenic helical gear pump, the first pneumatic ball valve, the second cryogenic helical gear pump, a second pneumatic ball valve, the first solenoid valve, the second solenoid valve, the electric regulating ball valve, the third pneumatic ball valve, and the signal output ends of the screw flowmeter, the first pressure sensor, and the second pressure sensor are all connected to the signal end of a controller.

[0006] Furthermore, the heating device includes a plate heat exchanger, the first heat medium port and the second heat medium port of the plate heat exchanger are connected to a high and low temperature oil cooler, the first cold medium port of the plate heat exchanger is connected to the medium box through a pipeline and a third pressure sensor, and the second cold medium port of the plate heat exchanger is connected to the medium box through a pipeline, a circulating pump group, and a manual ball valve.

[0007] Furthermore, a liquid level sensor is provided in the medium box.

[0008] Furthermore, it also includes an alarm, and the control end of the alarm is connected to the signal end of the controller.

[0009] Furthermore, the third end and the fourth end of the differential pressure sensor are connected to the solenoid valve and the solenoid valve respectively through pipelines.

[0010] Compared with the prior art, the present invention has a positive and obvious effect. The present invention adopts a low-temperature helical gear pump and a screw flowmeter. The applicable viscosity range of the low-temperature helical gear pump is 10 to 20,000 cst and the temperature range is -40 to 200°C. When the low-temperature viscosity of the medium reaches 9,000 cst, the controller adjusts the speed of the low-temperature helical gear pump after extracting the current temperature and flow rate to calculate the viscosity, so that the required flow rate can be output normally. The viscosity range of the screw flowmeter is very wide, between 10 and 2,500,000 cst, and the temperature range is between -40 and -210°C. It has a wide range of use and high precision, can meet the test requirements, and obtain correct data. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of a flow performance testing device of the present invention.

[0012] Figure 2 This is the kinematic viscosity curve of ATF transmission gear oil at corresponding temperature. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the embodiments, and all similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of description and is not a limitation on the technical solution of the present invention.

[0014] like Figure 1 and Figure 2As shown, a flow performance testing device of the present invention includes a medium box 1, in which a temperature sensor 4 and an absolute pressure sensor 5 are arranged, and the medium box 1 is provided with an oil suction port (not shown in the figure), and a mounting seat (not shown in the figure) is arranged at the oil suction port, and a filter mounting groove is arranged in the mounting seat, one end of the filter mounting groove is connected to the outlet of the medium box 1, and the other end of the filter mounting groove is connected to the first end of a screw flowmeter 12 through a pipeline, a first cryogenic helical gear pump 6, and a first pneumatic ball valve 91. The first cryogenic helical gear pump 6 and the first pneumatic ball valve 91 are connected in parallel with a second cryogenic helical gear pump 8 and a second pneumatic ball valve 92, and are also connected in parallel with a regulating valve 7. A first pressure sensor 111 is arranged on the pipeline between the first pneumatic ball valve 91 and the screw flowmeter 12, and the second end of the screw flowmeter 12 is connected to a first three-way valve through a pipeline, a second pressure sensor 112 The first end of the ball valve 201 is connected, the second end of the first three-way ball valve 201 is connected to the first end of a second three-way ball valve 202, the third end of the first three-way ball valve 201 is connected to the first end of a pipeline filter specimen 14, the second end of the pipeline filter specimen 14 is connected to the second end of the second three-way ball valve 202, the first end of the pipeline filter specimen 14 is also connected to the first end of a differential pressure sensor 22 through a pipeline and a first solenoid valve 231, the second end of the pipeline filter specimen 14 is also connected to the second end of the differential pressure sensor 22 through a pipeline and a second solenoid valve 232, the third end of the second solenoid valve 232 is connected to the inlet of the medium box 1 through a pipeline and an electric regulating ball valve 16, and the electric regulating ball valve 16 is connected in parallel with a third pneumatic ball valve 28, a bypass filter 29, and a one-way valve 30; the outlet of the medium box 1 is connected to the inlet of the medium box 1 through a pipeline and a heating device;

[0015] The control ends of the first cryogenic helical gear pump 6, the first pneumatic ball valve 91, the second cryogenic helical gear pump 8, a second pneumatic ball valve 92, the first solenoid valve 231, the second solenoid valve 232, the electric regulating ball valve 16, the third pneumatic ball valve 28 and the signal output ends of the screw flowmeter 12, the first pressure sensor 111, and the second pressure sensor 112 are all connected to the signal end of a controller.

[0016] Furthermore, the heating device includes a plate heat exchanger 21, the first heat medium port and the second heat medium port of the plate heat exchanger 21 are connected to a high and low temperature oil cooler, the first cold medium port of the plate heat exchanger 21 is connected to the medium box 1 through a pipeline and a third pressure sensor 15, and the second cold medium port of the plate heat exchanger 21 is connected to the medium box 1 through a pipeline, a circulating pump group 19, and a manual ball valve 31.

[0017] Furthermore, a liquid level sensor 3 is provided in the medium box 1 .

[0018] Furthermore, an alarm (not shown) is included, and a control end of the alarm is connected to the signal end of the controller.

[0019] Furthermore, the third end and the fourth end of the differential pressure sensor 22 are connected to the solenoid valve 233 and the solenoid valve 234 respectively through pipelines.

[0020] Specifically, the first cryogenic helical gear pump 6, the first pneumatic ball valve 91, the second cryogenic helical gear pump 8, a second pneumatic ball valve 92, the first solenoid valve 231, the second solenoid valve 232, the electric regulating ball valve 16, the third pneumatic ball valve 28, the screw flowmeter 12, the first pressure sensor 111, the second pressure sensor 112, etc. in this embodiment all adopt the well-known scheme in the prior art, which is well known to those skilled in the art and will not be described here. The cryogenic helical gear pump is produced by KRACHT of Germany, and the model is KF5RF23 / 158-GJS, KF32 RF31. The screw flowmeter is produced by KRACHT of Germany, and the model is SVC 10K1 F1D2 HH.

[0021] Specifically, the waste liquid tank 24 is connected to the oil receiving pan of the test piece bin through a hose. The waste liquid generated by the operator during the disassembly and assembly of the test piece will flow into the waste liquid tank. The waste liquid tank 24 is connected to a liquid level control relay 26 and a discharge ball valve 27. When the waste liquid in the waste liquid tank 24 reaches the alarm point of the liquid level control relay 26, the controller controls the alarm to sound, and the user can discharge the waste liquid through the discharge ball valve 27.

[0022] The working principle of this embodiment:

[0023] The medium box 1 is filled with the test medium, namely ATF transmission gear oil.

[0024] The liquid level sensor 3 is used to measure the liquid level height in the medium box 1 and send a signal to the controller. When the liquid level reaches the upper and lower limits, the controller controls the alarm to sound an alarm. When the liquid level reaches the lower limit, the first cryogenic helical gear pump 6 and the second cryogenic helical gear pump 8 will not be started. When it reaches the upper limit, the controller controls the alarm to sound an alarm to prompt to stop adding the medium.

[0025] The temperature sensor 4 is used to measure the temperature of the medium in the medium box 1. The controller calculates the viscosity of the medium based on the temperature, selects the pump group corresponding to the flow rate based on the result, opens the first cryogenic helical gear pump 6, the first pneumatic ball valve 91 or the second cryogenic helical gear pump 8, the second pneumatic ball valve 92, and the regulating valve 7 can fine-tune the pressure. The screw flowmeter 12 monitors the flow rate.

[0026] Adjust the variable frequency motor of the first cryogenic helical gear pump 6, and open the first pneumatic ball valve 91 at the same time to control the flow rate between (1.5L / min and 15L / min); adjust the variable frequency motor of the second cryogenic helical gear pump 8, and open the second pneumatic ball valve 92 at the same time to control the flow rate between (9.6L / min and 96L / min).

[0027] 1. System protection

[0028] The first pressure sensor 111 monitors the pressure on the front side of the screw flowmeter 12. When the first pressure sensor 111 detects a pressure of >2MPa, the system alarms and shuts down (stops the first low-temperature helical gear pump 6 and the second low-temperature helical gear pump 8). The second pressure sensor 112 monitors the pressure on the front end of the pipeline filter test piece 14. When the second pressure sensor 112 detects a pressure of >0.8MPa, the system alarms and shuts down. The third pressure sensor 15 monitors the pressure on the front side of the plate heat exchanger 21. When the third pressure sensor 15 detects a pressure of >2MPa, the system alarms and shuts down.

[0029] 2. System temperature control

[0030] The medium temperature in the medium box 1 is controlled and adjusted by the high and low temperature oil cooler. The manual ball valve 31 is opened, and the medium returns to the medium box through the circulation pump group 19 and the plate heat exchanger 21 to heat the medium. The temperature sensor 4 detects the medium temperature, and the controller adjusts the medium temperature between -40 and 150°C according to the requirements of the test piece.

[0031] 3. System flow control

[0032] According to the prefabricated data (such as Figure 2 The viscosity-temperature curve of the medium shown in the figure) is calculated and outputted through the controller, and the temperature and flow characteristic curve is switched between the first cryogenic helical gear pump 6 and the second cryogenic helical gear pump 8 according to the flow required for the test and the controller adjusts the frequency converters of the respective pump groups to control the speed of the pump groups to achieve the flow required for the test.

[0033] 4. System Test

[0034] The system test is divided into the oil suction filter flow resistance test, pipeline filter flow resistance test and system self-circulation cleaning:

[0035] Suction filter flow resistance test: Install the suction filter 2 into the filter installation slot of the mounting seat, manually switch the first three-way ball valve 201 and the second three-way ball valve 202 to the bypass, and connect the first three-way ball valve 201 with the second three-way ball valve 202 to short-circuit the filter test piece 14. At this time, the medium flow direction is the medium box 1 → suction filter 2 → first low-temperature helical gear pump 6 (second low-temperature helical gear pump 8) → first pneumatic ball valve 91 (second pneumatic ball valve 92) → screw flowmeter 12 → first three-way ball valve 201 → second three-way ball valve 202 → electric regulating ball valve 16 → medium box 1. Open the first low-temperature helical gear pump 6, the first pneumatic ball valve 91 or the second low-temperature helical gear pump 8, the second pneumatic ball valve 92 according to the required temperature, adjust the flow rate to the test range according to the viscosity-temperature curve, and the absolute pressure sensor 5 and the screw flowmeter 12 respectively measure the pressure and flow changes, and the controller draws a pressure curve according to the data.

[0036] Pipeline filter flow resistance test: Manually switch the first three-way ball valve 201 and the second three-way ball valve 202 to the main line, remove the oil suction filter 2, immerse the mounting seat in the medium, and ensure that the pipeline is unobstructed. At this time, the medium flows in the following direction: medium box 1 → mounting seat → first cryogenic helical gear pump 6 (second cryogenic helical gear pump 8) → first pneumatic ball valve 91 (second pneumatic ball valve 92) → screw flowmeter 12 → first three-way ball valve 201 → pipeline filter test piece 14 → second three-way ball valve 202 → electric regulating ball valve 16 → medium box 1. According to the required temperature, the first cryogenic helical gear pump 6, the first pneumatic ball valve 91 or the second cryogenic helical gear pump 8, the second pneumatic ball valve 92 are opened, the flow rate is adjusted to the test range, the first solenoid valve 231, the second solenoid valve 232, the third solenoid valve 233, and the fourth solenoid valve 234 are opened, and the third solenoid valve 233 and the fourth solenoid valve 234 are closed after 10 seconds to release the air in the differential pressure sensor 22, so as to ensure that the differential pressure sensor 22 is full of liquid during the measurement process, without bubble interference, and the result is accurate and stable. The differential pressure sensor 22 is monitored, the absolute pressure sensor 5, and the screw flowmeter 12 respectively measure the pressure and flow changes, and the controller draws a pressure curve according to the data. According to the test outline requirements, the electric regulating ball valve 16 can be adjusted to provide the system with the required back pressure.

[0037] System self-circulation cleaning: When the system needs to clean the medium, manually switch the first three-way ball valve 201 and the second three-way ball valve 202 to the bypass, close the electric regulating ball valve 16, open the third pneumatic ball valve 28, adjust the system temperature between 40 and 80°C, start the corresponding pump group according to the temperature, and start the medium circulation through the bypass filter 29 and the one-way valve 30. The medium flows in the following direction: medium box 1 → oil suction filter 2 → first low-temperature helical gear pump 6 (second low-temperature helical gear pump 8) → first pneumatic ball valve 91 (second pneumatic ball valve 92) → screw flowmeter 12 → first three-way ball valve 201 → second three-way ball valve 202 → third pneumatic ball valve 28 → bypass filter 29 → one-way valve 30 → medium box 1.

[0038] The present invention adopts a low-temperature helical gear pump and a screw flowmeter. The applicable viscosity range of the low-temperature helical gear pump is 10 to 20,000 cst and the temperature range is -40 to 200°C. When the low-temperature viscosity of the medium reaches 9,000 cst, the controller cooperates to extract the current temperature and flow to calculate the viscosity and then adjusts the rotation speed of the low-temperature helical gear pump so that the required flow can be output normally. The viscosity range of the screw flowmeter is very wide, between 10 and 2,500,000 cst, and the temperature range is between -40 and -210°C. It has a wide range of use and high precision, can meet test requirements, and obtain correct data.

[0039] The controller outputs the temperature and flow characteristic curve according to the pre-set data, and adjusts and switches the speed of the low-temperature helical gear pump according to the curve to achieve the flow required by the system. It has an accurate grasp of the viscosity-temperature characteristics of the medium, and the flow control is stable and fast.

Claims

1. A flow performance testing device, characterized in that: The invention comprises a medium box, wherein a temperature sensor and an absolute pressure sensor are arranged in the medium box, an oil suction port is arranged at the oil suction port, a mounting seat is arranged in the mounting seat, a filter mounting groove is arranged, one end of the filter mounting groove is communicated with the outlet of the medium box, the other end of the filter mounting groove is connected with the first end of a screw flowmeter through a pipeline, a first low-temperature helical gear pump, and a first pneumatic ball valve, the first low-temperature helical gear pump and the first pneumatic ball valve are connected in parallel with a second low-temperature helical gear pump and a second pneumatic ball valve, and a regulating valve is also connected in parallel, a first pressure sensor is arranged on the pipeline between the first pneumatic ball valve and the screw flowmeter, and the second end of the screw flowmeter is connected with the first end of a first three-way ball valve through the pipeline, the second pressure sensor, and the first end of the screw flowmeter is connected with the first end of a first three-way ball valve. The first end of the first three-way ball valve is connected to the first end of a second three-way ball valve, the third end of the first three-way ball valve is connected to the first end of a pipeline filter test piece, the second end of the pipeline filter test piece is connected to the second end of the second three-way ball valve, the first end of the pipeline filter test piece is also connected to the first end of a differential pressure sensor through a pipeline and a first solenoid valve, the second end of the pipeline filter test piece is also connected to the second end of the differential pressure sensor through a pipeline and a second solenoid valve, the third end of the second solenoid valve is connected to the inlet of the medium box through a pipeline and an electric regulating ball valve, and the electric regulating ball valve is connected in parallel with a third pneumatic ball valve, a bypass filter, and a one-way valve; the outlet of the medium box is connected to the inlet of the medium box through a pipeline and a heating device; The control ends of the first cryogenic helical gear pump, the first pneumatic ball valve, the second cryogenic helical gear pump, a second pneumatic ball valve, the first solenoid valve, the second solenoid valve, the electric regulating ball valve, the third pneumatic ball valve, and the signal output ends of the screw flowmeter, the first pressure sensor, and the second pressure sensor are all connected to the signal end of a controller.

2. A flow performance testing device according to claim 1, characterized in that: The heating device includes a plate heat exchanger, the first heat medium port and the second heat medium port of the plate heat exchanger are connected to a high and low temperature oil cooler, the first cold medium port of the plate heat exchanger is connected to the medium box through a pipeline and a third pressure sensor, and the second cold medium port of the plate heat exchanger is connected to the medium box through a pipeline, a circulating pump group, and a manual ball valve.

3. A flow performance testing device according to claim 1, characterized in that: A liquid level sensor is arranged in the medium box.

4. A flow performance testing device according to claim 1, characterized in that: It also includes an alarm, and a control end of the alarm is connected to the signal end of the controller.

5. A flow performance testing device according to claim 1, characterized in that: The third end and the fourth end of the pressure difference sensor are connected to the solenoid valve and the solenoid valve respectively through pipelines.

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