CN216589414U - Secondary cooling low-temperature hydraulic oil source - Google Patents
Secondary cooling low-temperature hydraulic oil source Download PDFInfo
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- CN216589414U CN216589414U CN202122915140.XU CN202122915140U CN216589414U CN 216589414 U CN216589414 U CN 216589414U CN 202122915140 U CN202122915140 U CN 202122915140U CN 216589414 U CN216589414 U CN 216589414U
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Abstract
The utility model provides a two-stage cooling low-temperature hydraulic oil source which comprises an oil tank, a vacuum-pumping system, a pressurization system, an oil supply loop, a first cooling device and a second cooling device. The gear delivery pump, the plunger pump, the pressure accumulator and the electromagnetic unloading overflow valve are sequentially connected through pipelines to form an oil supply loop for supplying oil to a tested product; the input end of the gear delivery pump is connected with the oil outlet of the oil tank, and the output end of the gear delivery pump is connected with the oil suction port of the plunger pump; the pressurizing system and the vacuumizing system are connected with the oil tank through pipelines; the first cooling device is arranged outside the oil tank, and a refrigeration circulating pump is arranged on an oil discharge pipeline connected with the oil tank and the first cooling device; the second cooling device is arranged on a pipeline between the plunger pump and the tested product. The utility model adopts the indirect cooling of the I-level oil tank refrigerator and the cooling of the II-level pipeline refrigerator, can effectively realize the stable control of the oil temperature, and meets the requirement of lower oil temperature in the service life and reliability test of hydraulic products.
Description
Technical Field
The utility model relates to the technical field of hydraulic pressure, in particular to a secondary cooling low-temperature hydraulic oil source.
Background
The hydraulic oil source is an important component of a hydraulic transmission and servo control system, comprises a hydraulic oil tank, a hydraulic pump, a motor, a control valve, a pipeline and the like, can provide flow and pressure required by a system execution element, and can control the pressure, the oil temperature and the pollution degree of a hydraulic system. In the process of testing the service life and reliability of a hydraulic product, the oil needs to be stabilized at a low temperature of minus 50 ℃ for a long time. The existing low-temperature oil source in a laboratory is limited by conditions, oil can be supplied only by adopting a freezing oil tank and oil cylinder extrusion mode, the temperature, the pressure and the flow of oil cannot meet the experimental requirements, the working time is far less than 5min, and the long-term working requirements of oil temperature of 50 ℃ below zero, pressure of 28Mpa and flow of more than 20L/min in a hydraulic product test cannot be met.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the conventional low-temperature hydraulic oil source, the utility model aims to provide a two-stage cooling low-temperature hydraulic oil source, wherein the temperature regulation and control adopts a two-stage temperature control mode of indirect cooling of a I-stage oil tank refrigerating machine and cooling of a II-stage pipeline refrigerating machine, so that the stable control of the oil temperature can be effectively realized, the requirement on lower oil temperature in the life and reliability test of a hydraulic product can be met, and the two-stage cooling low-temperature hydraulic oil source is widely applied to the life and reliability test.
The utility model provides a secondary-cooling low-temperature hydraulic oil source which comprises an oil tank, a vacuum-pumping system, a pressurization system, an oil supply loop, a first cooling device and a second cooling device, wherein the oil tank is connected with the first cooling device; the gear delivery pump, the plunger pump, the pressure accumulator and the electromagnetic unloading overflow valve are sequentially connected through pipelines to form the oil supply loop for supplying oil to a tested product; the input end of the gear delivery pump is connected with the oil outlet of the oil tank, the output end of the gear delivery pump is connected with the oil suction port of the plunger pump, and a second temperature sensor and a second pressure sensor are arranged on a pipeline connecting the oil outlet of the plunger pump with the pressure accumulator and the electromagnetic unloading overflow valve; a first pressure sensor and a first temperature sensor are arranged on the oil tank; the pressurization system and the vacuum pumping system are connected with the oil tank through pipelines; the first cooling device is arranged outside the oil tank, and a refrigeration circulating pump is arranged on an oil discharge pipeline connected with the oil tank and the first cooling device; the second cooling device is arranged on a pipeline between the plunger pump and the tested product, and a third temperature sensor and a third pressure sensor are arranged on a pipeline connected with the plunger pump and the second cooling device.
Preferably, a one-way valve and an electric adjusting ball valve are arranged on a pipeline connected with the gear delivery pump and the plunger pump.
Preferably, a mass flow meter is arranged on a pipeline connecting the plunger pump and the tested product.
Preferably, the pressurization system comprises an inflation source and a first electric switch valve, and the vacuumizing system comprises a vacuumizing device and a second electric switch valve.
Preferably, the gas in the inflation source is nitrogen.
Preferably, a high-low liquid level alarm device is arranged in the oil tank, and a liquid level meter is correspondingly arranged outside the oil tank.
Preferably, a filter is further arranged on a pipeline connecting the gear delivery pump and the plunger pump
Compared with the prior art, the secondary cooling low-temperature hydraulic oil source provided by the utility model has the following technical advantages:
(1) the oil tank pressurization and the front gear pump are adopted for supplying liquid, so that the pressure at the inlet of the main hydraulic plunger pump of the oil source is ensured, and the problem of insufficient oil absorption of the main oil supply pump of the oil source is avoided;
(2) the mode of indirect cooling of the I-level oil tank refrigerator and cooling of the II-level pipeline refrigerator is adopted, so that the problems that after the oil tank is simply frozen, the viscosity of oil is too high, the oil pump cannot be selected, and only a hydraulic cylinder can be used for loading and supplying oil are solved;
(3) the temperature is indirectly cooled to-55 ℃ by adopting a grade I oil tank refrigerating machine, and the temperature rise generated by the working of equipment is counteracted by a grade II high-pressure pipeline refrigerating machine, so that the temperature of an oil supply port of an oil source is controlled below-50 ℃.
Drawings
Fig. 1 is a schematic structural diagram of a two-stage cooled cryogenic hydraulic oil source according to the present invention.
Detailed Description
The technical contents, structural features, attained objects and effects of the present invention are explained in detail below with reference to the accompanying drawings.
The utility model provides a two-stage cooling low-temperature hydraulic oil source, which comprises an oil tank 1, a vacuum-pumping system, a pressurizing system, an oil supply loop, a first cooling device and a second cooling device, wherein the first cooling device is an oil tank refrigerating machine 10 in the embodiment, and the second cooling device is a pipeline refrigerating machine 18, as shown in figure 1.
Vacuumizing system and turbocharging system pass through the pipeline and are connected with oil tank 1, and vacuumizing system includes evacuation equipment 5 and second electric switch valve 8, and turbocharging system includes gas charging source and first electric switch valve 7, and in this embodiment, adopts nitrogen gas charging source 6 to pressurize for the oil tank, prevents that low temperature from producing the phenomenon of icing.
The oil tank 1 is provided with a first pressure sensor 4 and a first temperature sensor 3.
The oil tank refrigerator 10 is arranged outside the oil tank 1, and oil inside the oil tank 1 is sent into a heat exchanger of the oil tank refrigerator 10 through a refrigeration circulating pump 9 to finish I-level cooling.
The gear delivery pump 11, the plunger pump 13, the pressure accumulator 14 and the electromagnetic unloading overflow valve 17 are connected in sequence through pipelines to form an oil supply loop for supplying oil to a tested product 22.
The input end of the gear conveying pump 11 is connected with the oil outlet of the oil tank 1, and the output end of the gear conveying pump 11 is connected with the oil suction port of the plunger pump 13. And a filter 12, a one-way valve 23 and an electric adjusting ball valve 24 are arranged on a connecting pipeline of the gear delivery pump 11 and the plunger pump 13. The gear transfer pump 11 sends the low-temperature oil in the oil tank 1 into the oil suction port of the plunger pump 13, and the oil supply pressure of the oil suction port of the plunger pump 13 is limited not to exceed 2bar through the one-way valve 23 and the electric adjusting ball valve 24, so that the oil suction port of the plunger pump 13 is ensured to have enough positive pressure medium.
A second temperature sensor 15 and a second pressure sensor 16 are arranged on a pipeline connecting an oil outlet of the plunger pump 13 with the pressure accumulator 14 and the electromagnetic unloading overflow valve 17, the pressure accumulator 14 is used for absorbing pressure and flow pulsation of the plunger pump 13, and the electromagnetic unloading overflow valve 17 can adjust oil supply pressure.
The pipeline refrigerator 18 is arranged on the pipeline between the plunger pump 13 and the tested product 22, and the pipelines of the plunger pump 13 and the pipeline refrigerator 18 are provided with a third temperature sensor 19, a third pressure sensor 20 and a flow meter 21. In the present embodiment, the flow meter 21 is a mass flow meter to meet the measurement requirement of the low-temperature medium flow.
The first pressure sensor, the second pressure sensor and the third pressure sensor are flat films so as to meet the measurement requirement of the low-temperature medium pressure.
The oil tank is insulated by polyurethane with the thickness of 100mm, the refrigerated medium can be stored for a long time, and the lowest temperature can be reduced to-60 ℃. A high-low liquid level alarm device is arranged in the oil tank, and the liquid level meter 2 is used for observing the height of the liquid level in the oil tank. The oil tank is provided with medium circulating filter system interface, can carry out bypass circulating filter to the fluid in the oil tank, has guaranteed the fluid cleanliness in the oil tank. In addition, a cleaning window is arranged on the oil tank body, so that the oil tank can be cleaned conveniently.
And the pipelines at two ends of the tested product are provided with stop valves, so that the product is convenient to replace.
The low-temperature hydraulic oil source adopts a two-stage temperature control measure to protect the stability of a system, firstly, the inside of an oil tank is circularly cooled, the temperature of oil is cooled to-55 ℃, the oil has temperature rise after passing through a gear pump and a plunger pump, and secondary temperature reduction compensation is carried out on the oil in an oil supply pipeline, so that the temperature of an outlet pipeline of the oil source is reduced to below-50 ℃.
The specific operation process is as follows:
oil liquid in an oil tank is pre-refrigerated before working: and opening the second electric switch valve 8 and the vacuumizing equipment 5 to vacuumize the oil tank. When the first pressure sensor 4 reaches a set value, the vacuumizing system is closed, the first electric switch valve 7 and the nitrogen gas filling source 6 are opened, and the oil tank is pressurized until the pressure reaches 2-3 bar. Starting the oil tank refrigeration circulating pump 9, and starting the oil tank refrigerator 10 after the circulation is stable. The refrigeration circulation pump 9 pumps oil from the oil tank 1, and the discharged low-pressure oil flows through a heat exchanger of the oil tank refrigerator 10 to refrigerate the oil in the oil tank. The oil tank is provided with a first temperature sensor 3, the first temperature sensor 3 and the oil tank refrigerating machine 10 adopt closed-loop control, and when the temperature of oil in the oil tank reaches-55 ℃, the operation of the oil tank refrigerating machine 10 is stopped.
The working process of the oil source is as follows: and opening the first electric switch valve 7 and the nitrogen gas charging source 6, and charging 2-3 bar of nitrogen gas into the oil tank. The gear delivery pump 11 is started to send low-temperature oil into the oil suction port of the plunger pump 13, and the oil supply pressure of the oil suction port of the plunger pump is limited to be not more than 2bar through the check valve 23 and the electric adjusting ball valve 24. The temperature and the pressure of oil pumped by the plunger pump 13 are measured by the second temperature sensor 15 and the second pressure sensor 16, so that the power of the pipeline refrigerator 18 is modified to offset the work temperature rise of the pump, the temperature of the oil is controlled to-50 ℃, the oil source controls the terminal pressure by the internal pressure accumulator 14 and the electromagnetic unloading overflow valve 17, the rotating speed of the motor of the low-temperature plunger pump is measured and adjusted by the mass flowmeter 21, and the terminal flow is controlled, thereby realizing the stable oil supply with the oil temperature of-50 ℃, the pressure of 28Mpa and the flow of 20L/min for a long time.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims (7)
1. A two-stage cooling low-temperature hydraulic oil source is characterized by comprising an oil tank, a vacuum pumping system, a pressurization system, an oil supply loop, a first cooling device and a second cooling device;
the gear delivery pump, the plunger pump, the pressure accumulator and the electromagnetic unloading overflow valve are sequentially connected through pipelines to form the oil supply loop for supplying oil to a tested product; the input end of the gear delivery pump is connected with the oil outlet of the oil tank, the output end of the gear delivery pump is connected with the oil suction port of the plunger pump, and a second temperature sensor and a second pressure sensor are arranged on a pipeline connecting the oil outlet of the plunger pump with the pressure accumulator and the electromagnetic unloading overflow valve;
a first pressure sensor and a first temperature sensor are arranged on the oil tank; the pressurizing system and the vacuumizing system are connected with the oil tank through pipelines;
the first cooling device is arranged outside the oil tank, and a refrigeration circulating pump is arranged on an oil discharge pipeline connected with the oil tank and the first cooling device;
the second cooling device is arranged on a pipeline between the plunger pump and the tested product, and a third temperature sensor and a third pressure sensor are arranged on a pipeline connected with the plunger pump and the second cooling device.
2. The secondary cooled cryogenic hydraulic oil source of claim 1 wherein a check valve and an electrically adjustable ball valve are provided on the piping connecting the gear pump and the plunger pump.
3. The secondary cooled cryogenic hydraulic oil source of claim 1 wherein a mass flow meter is provided in the line connecting the plunger pump and the product under test.
4. The secondary cooled cryogenic hydraulic oil supply of claim 1, wherein the pressurization system comprises an inflation source and a first electrically operated switching valve, and the evacuation system comprises an evacuation device and a second electrically operated switching valve.
5. The secondary cooled cryogenic hydraulic oil source of claim 4, wherein the gas in the inflation source is nitrogen.
6. The secondary cooling cryogenic hydraulic oil source of claim 1, wherein a high-low liquid level alarm device is arranged in the oil tank, and a liquid level meter is correspondingly arranged outside the oil tank.
7. The secondary cooled cryogenic hydraulic oil source of claim 2 wherein a filter is further provided on the piping connecting the gear pump and the plunger pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122915140.XU CN216589414U (en) | 2021-11-25 | 2021-11-25 | Secondary cooling low-temperature hydraulic oil source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122915140.XU CN216589414U (en) | 2021-11-25 | 2021-11-25 | Secondary cooling low-temperature hydraulic oil source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216589414U true CN216589414U (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122915140.XU Active CN216589414U (en) | 2021-11-25 | 2021-11-25 | Secondary cooling low-temperature hydraulic oil source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216589414U (en) |
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2021
- 2021-11-25 CN CN202122915140.XU patent/CN216589414U/en active Active
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