CN221195558U - Hydraulic system of low-temperature high-pressure test bed - Google Patents
Hydraulic system of low-temperature high-pressure test bed Download PDFInfo
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- CN221195558U CN221195558U CN202322761097.5U CN202322761097U CN221195558U CN 221195558 U CN221195558 U CN 221195558U CN 202322761097 U CN202322761097 U CN 202322761097U CN 221195558 U CN221195558 U CN 221195558U
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- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 230000003068 static effect Effects 0.000 claims abstract description 45
- 239000003921 oil Substances 0.000 claims description 99
- 239000007788 liquid Substances 0.000 claims description 34
- 230000002706 hydrostatic effect Effects 0.000 claims description 15
- 238000005057 refrigeration Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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Abstract
The utility model provides a hydraulic system of a low-temperature high-pressure test bed, which relates to the field of aviation equipment detection, and can realize the working cycle and static pressure test of actuating cylinder products and accumulator products.
Description
Technical Field
The utility model relates to the field of aircraft equipment detection, in particular to a hydraulic system of a low-temperature high-pressure test bed.
Background
Before leaving the factory, the products of the actuating cylinders and the pressure accumulators in the aircraft need to be subjected to a limit temperature test and a low-temperature working cycle life test. The life test process of the actuator cylinder mainly comprises three parts of a static pressure test, a circulation test and an emergency test. One working cycle of the actuator cylinder comprises four working steps of extending, extending and maintaining pressure, retracting and retracting the actuator cylinder. According to the requirements of the existing technology, the low-temperature working cycle needs hydraulic oil to enter the product instantly at a specified low temperature (generally about-55 ℃) to carry out the working cycle.
At present, a low-temperature hydraulic system of a traditional product temperature test bed can realize working circulation or static pressure test and the like of an actuator cylinder product and an accumulator product, but the traditional hydraulic system is unreasonable in setting, and the traditional low-temperature test bed hydraulic system enables oil to form flushing circulation from an oil tank to a refrigerating system and then to the oil tank in a small range through test tools such as an external ball valve and a pipeline, so that when the oil in the oil tank enters the actuator cylinder, the temperature is not designated, and the temperature control is poor.
Disclosure of utility model
The utility model aims to provide a hydraulic system of a low-temperature high-pressure test bed, which is reasonable in overall design, can accurately control the oil temperature, and can reduce the use of low-temperature components.
Embodiments of the present utility model are implemented as follows:
In a first aspect, the utility model provides a low-temperature high-pressure test bed hydraulic system, which comprises a first hydraulic source, a throttle valve, a low-temperature refrigerating system, a first three-position four-way reversing valve, a second three-position four-way reversing valve, a first overflow valve and a second overflow valve; the output end of the first hydraulic source is connected with the throttle valve, the throttle valve is connected with the inlet end of the low-temperature refrigerating system, the outlet end of the low-temperature refrigerating system is connected with the P port of the first three-position four-way reversing valve, and the remaining T port, A port and B port of the first three-position four-way reversing valve are respectively connected with the oil return end of the first hydraulic source, the rodless cavity of the actuator and the rod cavity of the actuator;
The P port, the T port, the A port and the B port of the second three-position four-way reversing valve are respectively connected with the outlet end of the low-temperature refrigerating system, the oil return end of the first hydraulic source, the pressure accumulator and the oil return end of the first hydraulic source;
An oil inlet of the first overflow valve is connected with an output end of the first hydraulic source, and an oil outlet of the first overflow valve is connected with an oil return end of the first hydraulic source;
An oil inlet of the second overflow valve is connected with an outlet end of the low-temperature refrigerating system, and an oil outlet of the second overflow valve is connected with an oil return end of the first hydraulic source.
In an alternative embodiment, the low temperature high pressure test stand hydraulic system further comprises a first two-way valve and a third relief valve, wherein the first two-way valve is connected in parallel with the first relief valve, and the third relief valve is connected in parallel with the first two-way valve.
In an alternative embodiment, the low-temperature high-pressure test bed hydraulic system further comprises a second two-position two-way valve, and the second two-position two-way valve is arranged on a passage of the second overflow valve connected with the low-temperature refrigeration system.
In an alternative embodiment, the low-temperature high-pressure test bench hydraulic system further comprises a check valve and a first high-pressure filter, and the check valve and the first high-pressure filter are connected in series on a passage where the first hydraulic pressure source is connected with the throttle valve.
In an alternative embodiment, the low-temperature high-pressure test bench hydraulic system further comprises a water cooler and a second high-pressure filter, wherein the water cooler and the second high-pressure filter are arranged at an oil return end of the first hydraulic source and are used for processing hydraulic oil flowing back to the first hydraulic source from the first overflow valve and the second overflow valve.
In an alternative embodiment, the low-temperature high-pressure test bed hydraulic system further comprises a motor, a thermometer and a pressure gauge, wherein the motor, the thermometer and the pressure gauge are all connected in series on a passage of the low-temperature refrigerating system connected with the first three-position four-way reversing valve.
In an alternative embodiment, the first hydraulic source includes a first oil tank, a first hydraulic pump, a first oil absorption filter, a first liquid level thermometer, a first liquid level control relay, a temperature transmitter and a first air filter, wherein one end of the first hydraulic pump is connected with the first oil absorption filter arranged in the first oil tank, the other end of the first hydraulic pump is connected with the throttle valve, and the first liquid level thermometer, the first liquid level control relay, the temperature transmitter and the first air filter are all arranged on the first oil tank.
In an alternative embodiment, the low-temperature high-pressure test bed hydraulic system further comprises a second hydraulic pressure source, a first static pressure interface, a second static pressure interface, a third static pressure interface and a visible static pressure liquid column; the input ends of the first static pressure interface, the second static pressure interface and the third static pressure interface are combined into a passage and are connected with the output end of the second hydraulic pressure source, and the input end of the visible static pressure liquid column is connected with the combined passage of the first static pressure interface, the second static pressure interface and the third static pressure interface and the oil return end of the second hydraulic pressure source.
In an alternative embodiment, the output end of the second hydraulic pressure source is provided with a first switch, and the passage for connecting the visible hydrostatic liquid column with the second hydraulic pressure source is provided with a second switch.
In an alternative embodiment, the second hydraulic source includes a second oil tank, a second hydraulic pump, a second oil suction filter, a second liquid level thermometer, a second liquid level control relay and a second air filter, one end of the second hydraulic pump is connected with the second oil suction filter arranged inside the second oil tank, the other end is connected with the first static pressure interface, the second static pressure interface and the input end of the third static pressure interface, and the second liquid level thermometer, the second liquid level control relay and the second air filter are all arranged on the second oil tank.
The embodiment of the utility model has the beneficial effects that:
The utility model provides a hydraulic system of a low-temperature high-pressure test bed, which comprises a first hydraulic source, a throttle valve, a low-temperature refrigerating system, a first three-position four-way reversing valve, a second three-position four-way reversing valve, a first overflow valve and a second overflow valve; the output end of the first hydraulic source is connected with a throttle valve, the throttle valve is connected with the inlet end of the low-temperature refrigerating system, the outlet end of the low-temperature refrigerating system is connected with the P port of the first three-position four-way reversing valve, and the remaining T port, the A port and the B port of the first three-position four-way reversing valve are respectively connected with the oil return end of the first hydraulic source, the rodless cavity of the actuator and the rod cavity of the actuator; the P port, the T port, the A port and the B port of the second three-position four-way reversing valve are respectively connected with the outlet end of the low-temperature refrigerating system, the oil return end of the first hydraulic source, the pressure accumulator and the oil return end of the first hydraulic source; an oil inlet of the first overflow valve is connected with an output end of the first hydraulic source, and an oil outlet of the first overflow valve is connected with an oil return end of the first hydraulic source; an oil inlet of the second overflow valve is connected with an outlet end of the low-temperature refrigerating system, and an oil outlet of the second overflow valve is connected with an oil return end of the first hydraulic source.
According to the utility model, the first overflow valve is a proportional pressure valve, the second overflow valve is a flow valve, when a low-temperature medium is needed in an actuator test, the flow medium is provided by a first hydraulic source, the pressure and the flow required by a product are obtained through adjustment of the first overflow valve and the second overflow valve, refrigeration circulation is carried out through a low-temperature refrigeration system, the temperature of the flow medium is refrigerated to the temperature required in the test, and the flow medium is ready to be supplied to the actuator or an accumulator product to provide low-temperature medium conditions for the low-temperature test of the product;
when a durable circulation low-temperature test of an actuator product is carried out, a flowing medium is provided by a first hydraulic source, pressure and flow required by the product are obtained through adjustment of a first overflow valve and a second overflow valve, the temperature of the product oil is refrigerated to the temperature required by the test through a low-temperature heating system, and the product oil is alternately commutated to enter the actuator product through a first three-position four-way reversing valve, so that the low-temperature circulation test of the actuator product is completed;
When the high-low pressure circulation low-temperature test of the accumulator product is carried out, a flowing medium is provided by a first hydraulic source, the required high pressure and flow of the product are obtained through adjustment of a first overflow valve and a second overflow valve, the temperature of the oil liquid of the product is refrigerated to the temperature required by the test through a low-temperature refrigerating system, the first potential of the second three-position four-way reversing valve is electrified, the accumulator product bears the high pressure, the second overflow valve is electrically communicated, the accumulator product bears the low pressure, the second potential of the second three-position four-way reversing valve is electrified, the accumulator product bears the zero pressure, and the first potential and the second potential of the second overflow valve and the second three-position four-way reversing valve are electrified and deenergized alternately according to the technological requirements of the product, so that the high-low pressure circulation test of the accumulator product is completed.
The utility model has reasonable overall design, can accurately control the oil temperature, can reduce the use of low-temperature components, adopts the scheme that the first overflow valve and the second overflow valve respectively control the system pressure and the flow, and has convenient operation, reliable performance, reasonable layout and easy maintenance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a hydraulic system of a low-temperature high-pressure test stand according to an embodiment of the present utility model.
Icon:
10-a first hydraulic source; 11-a throttle valve; 12-cryogenic refrigeration system; 13-a first three-position four-way reversing valve; 14-a second three-position four-way reversing valve; 15-a first overflow valve; 16-a second overflow valve; 17-a first two-position two-way valve; 18-a third overflow valve; 19-a second two-position two-way valve; 20-a one-way valve; 21-a first high pressure filter; 22-a water cooler; 23-a second high pressure filter; 24-motor; 25-thermometer; 26-manometer; 27-a first oil tank; 28-a first hydraulic pump; 29-a first oil absorption filter; 30-a first level thermometer; 31-a first level control relay; a 32-temperature transmitter; 33-a first air cleaner; 34-a second hydraulic pressure source; 35-a first static pressure interface; 36-a second static pressure interface; 37-a third static pressure interface; 38-visual hydrostatic liquid column; 39-a first switch; 40-a second switch; 41-a second oil tank; 42-a second hydraulic pump; 43-a second oil absorption filter; 44-a second level thermometer; 45-a second liquid level control relay; 46-a second air cleaner.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The high pressure in this embodiment means a pressure value of 2 to 42PMa.
As shown in fig. 1, the embodiment provides a hydraulic system of a low-temperature high-pressure test stand, which comprises a first hydraulic source 10, a throttle valve 11, a low-temperature refrigerating system 12, a first three-position four-way reversing valve 13, a second three-position four-way reversing valve 14, a first overflow valve 15 and a second overflow valve 16; the output end of the first hydraulic pressure source 10 is connected with a throttle valve 11, the throttle valve 11 is connected with the inlet end of the low-temperature refrigerating system 12, the outlet end of the low-temperature refrigerating system 12 is connected with the P port of the first three-position four-way reversing valve 13, and the remaining T port, A port and B port of the first three-position four-way reversing valve 13 are respectively connected with the oil return end of the first hydraulic pressure source 10, the rodless cavity of the actuator and the rod cavity of the actuator; the port P, the port T, the port A and the port B of the second three-position four-way reversing valve 14 are respectively connected with the outlet end of the low-temperature refrigerating system 12, the oil return end of the first hydraulic source 10, the pressure accumulator and the oil return end of the first hydraulic source 10; the oil inlet of the first overflow valve 15 is connected with the output end of the first hydraulic source 10, and the oil outlet of the first overflow valve 15 is connected with the oil return end of the first hydraulic source 10; an oil inlet of the second overflow valve 16 is connected with an outlet end of the low-temperature refrigerating system 12, and an oil outlet of the second overflow valve 16 is connected with an oil return end of the first hydraulic source 10. In detail, in this embodiment, when the first three-position four-way reversing valve 13 is not powered, the port P is in a closed state, the port a, the port B and the port T are in a communicating state, when the first electric potential is powered, the port P is communicated with the port B, the port a is communicated with the port T, and when the second electric potential is powered, the port P is communicated with the port a, and the port T is communicated with the port B; the second three-position four-way reversing valve 14 and the first three-position four-way reversing valve 13 adopt the same valve.
In this embodiment, the first relief valve 15 is a proportional pressure valve, the second relief valve 16 is a flow valve, when the actuator test needs a low-temperature medium, the flow medium is provided by the first hydraulic pressure source 10, the pressure and flow required by the product are obtained through adjustment of the first relief valve 15 and the second relief valve 16, the refrigeration cycle is performed through the low-temperature refrigeration system 12, the temperature of the flow medium is refrigerated to the temperature required by the test, and the flow medium is ready to be supplied to the actuator or the accumulator product, so as to provide low-temperature medium conditions for the low-temperature test of the product;
When the durable circulation low-temperature test of the actuator product is carried out, a flowing medium is provided by a first hydraulic source 10, the pressure and the flow required by the product are regulated by a first overflow valve 15 and a second overflow valve 16, the temperature of the product oil is refrigerated to the temperature required by the test by a low-temperature heating system, and the product is alternately commutated by a first three-position four-way reversing valve 13 to enter the actuator product, so that the low-temperature circulation test of the actuator product is completed;
When the high-low pressure circulation low-temperature test of the accumulator product is carried out, a flowing medium is provided by the first hydraulic source 10, the required high pressure and flow of the product are obtained through the adjustment of the first overflow valve 15 and the second overflow valve 16, the temperature of the oil of the product is refrigerated to the temperature required by the test through the low-temperature refrigeration system 12, the first potential of the second three-position four-way reversing valve 14 is electrified, the accumulator product is subjected to high pressure, the second overflow valve 16 is electrically communicated, the accumulator product is subjected to low pressure, the second potential of the second three-position four-way reversing valve 14 is electrified, the accumulator product is subjected to zero pressure, and the first potential and the second potential of the second overflow valve 16 and the second three-position four-way reversing valve 14 are alternately electrified and deenergized according to the technological requirements of the product, so that the high-low pressure circulation test of the accumulator product is completed.
The embodiment has reasonable overall design, can accurately control the oil temperature, can reduce the use of low-temperature components, and adopts the scheme that the first overflow valve 15 and the second overflow valve 16 respectively control the pressure and the flow of the hydraulic system, and has convenient operation, reliable performance, reasonable layout and easy maintenance.
Further, the hydraulic system of the low-temperature high-pressure test bed also comprises a first two-position two-way valve 17 and a third overflow valve 18, wherein the first two-position two-way valve 17 is connected with the first overflow valve 15 in parallel, and the third overflow valve 18 is connected with the first two-position two-way valve 17 in parallel. In detail, the first two-way valve 17 is in a communication state when not energized, and the first two-way valve 17 is in a cutoff state when energized. It will be appreciated that the first two-way valve 17 and the third relief valve 18 are combined into an electromagnetic relief valve, and that the first relief valve 15 regulates the pressure of the hydraulic system when the first two-way valve 17 is energized.
Further, the hydraulic system of the low-temperature high-pressure test stand further comprises a second two-position two-way valve 19, and the second two-position two-way valve 19 is arranged on a passage of the second overflow valve 16 connected with the low-temperature refrigerating system 12. In detail, the second two-position two-way valve 19 is in a cut-off state when not energized, and the second two-position two-way valve 19 is in a communication state when energized, and it is understood that the flow rate from the cryogenic refrigeration system 12 to the first three-position four-way reversing valve 13 can be adjusted after the second two-position two-way valve 19 is energized.
Further, the low-temperature high-pressure test bench hydraulic system further comprises a check valve 20 and a first high-pressure filter 21, and the check valve 20 and the first high-pressure filter 21 are connected in series on a passage of the first hydraulic pressure source 10 connected with the throttle valve 11. It will be appreciated that the check valve 20 prevents back flow of oil and the first high pressure filter 21 acts to filter impurities from the oil.
Further, the low-temperature high-pressure test bench hydraulic system further comprises a water cooler 22 and a second high-pressure filter 23, wherein the water cooler 22 and the second high-pressure filter 23 are arranged at the oil return end of the first hydraulic pressure source 10 and are used for treating hydraulic oil flowing back to the first hydraulic pressure source 10 from the first overflow valve 15 and the second overflow valve 16. It will be appreciated that the water cooler 22 is used to cool the temperature of the hydraulic system oil, and in other embodiments, the water cooler 22 may be replaced with an air cooler; the function of the second high-pressure filter 23 communicates with the function of the first high-pressure filter 21.
Further, the low-temperature high-pressure test bed hydraulic system further comprises a motor 24, a thermometer 25 and a pressure gauge 26, wherein the motor 24, the thermometer 25 and the pressure gauge 26 are all connected in series on a passage of the low-temperature refrigeration system 12 connected with the first three-position four-way reversing valve 13. It will be appreciated that the motor 24 acts to push the oil in the pipeline, and the thermometer 25 and the manometer 26 act to measure the temperature and pressure of the oil exiting the cryogenic refrigeration system 12, respectively, so as to facilitate the technician to adjust in time and ensure the oil temperature control precision and pressure control precision of the low temperature test of the product.
In this embodiment, the first hydraulic pressure source 10 includes a first oil tank 27, a first hydraulic pump 28, a first oil suction filter 29, a first liquid level thermometer 30, a first liquid level control relay 31, a temperature transmitter 32, and a first air filter 33, one end of the first hydraulic pump 28 is connected to the first oil suction filter 29 provided inside the first oil tank 27, the other end is connected to the throttle valve 11, and the first liquid level thermometer 30, the first liquid level control relay 31, the temperature transmitter 32, and the first air filter 33 are all provided on the first oil tank 27. In detail, the oil return end of the first hydraulic pressure source 10 is provided on the first oil tank 27.
Further, the hydraulic system of the low-temperature high-pressure test bed also comprises a second hydraulic pressure source 34, a first static pressure interface 35, a second static pressure interface 36, a third static pressure interface 37 and a visible static pressure liquid column 38; the input ends of the first static pressure interface 35, the second static pressure interface 36 and the third static pressure interface 37 are combined into a passage and are connected to the output end of the second hydraulic pressure source 34, and the input end of the visible static pressure liquid column 38 is connected to the combined passage of the first static pressure interface 35, the second static pressure interface 36 and the third static pressure interface 37 and the oil return end of the second hydraulic pressure source 34. It will be appreciated that the purpose of the static interface and the visual hydrostatic column 38 is to perform a hydrostatic test on the product, and that when the hydrostatic test is performed, the height of the visual hydrostatic column 38 is manually adjusted, and when the hydrostatic column reaches the desired height, the hydrostatic system is shut down and the hydrostatic test of the product can begin.
Further, the output end of the second hydraulic pressure source 34 is provided with a first switch 39, and a second switch 40 is provided on a passage through which the visible hydrostatic liquid column 38 is connected with the second hydraulic pressure source 34.
Specifically, the second hydraulic pressure source 34 includes a second oil tank 41, a second hydraulic pump 42, a second oil suction filter 43, a second liquid level thermometer 44, a second liquid level control relay 45, and a second air filter 46, one end of the second hydraulic pump 42 is connected to the second oil suction filter 43 disposed inside the second oil tank 41, the other end is connected to the input-end merging passage of the first static pressure interface 35, the second static pressure interface 36, and the third static pressure interface 37, and the second liquid level thermometer 44, the second liquid level control relay 45, and the second air filter 46 are all disposed on the second oil tank 41.
The hydraulic system of the low-temperature high-pressure test bed provided by the embodiment has the following advantages:
In this embodiment, the first relief valve 15 is a proportional pressure valve, the second relief valve 16 is a flow valve, when the actuator test needs a low-temperature medium, the flow medium is provided by the first hydraulic pressure source 10, the pressure and flow required by the product are obtained through adjustment of the first relief valve 15 and the second relief valve 16, the refrigeration cycle is performed through the low-temperature refrigeration system 12, the temperature of the flow medium is refrigerated to the temperature required by the test, and the flow medium is ready to be supplied to the actuator or the accumulator product, so as to provide low-temperature medium conditions for the low-temperature test of the product; when the durable circulation low-temperature test of the actuator product is carried out, a flowing medium is provided by a first hydraulic source 10, the pressure and the flow required by the product are regulated by a first overflow valve 15 and a second overflow valve 16, the temperature of the product oil is refrigerated to the temperature required by the test by a low-temperature heating system, and the product is alternately commutated by a first three-position four-way reversing valve 13 to enter the actuator product, so that the low-temperature circulation test of the actuator product is completed; when the high-low pressure circulation low-temperature test of the accumulator product is carried out, a flowing medium is provided by the first hydraulic source 10, the required high pressure and flow of the product are obtained through the adjustment of the first overflow valve 15 and the second overflow valve 16, the temperature of the oil of the product is refrigerated to the temperature required by the test through the low-temperature refrigeration system 12, the first potential of the second three-position four-way reversing valve 14 is electrified, the accumulator product is subjected to high pressure, the second overflow valve 16 is electrically communicated, the accumulator product is subjected to low pressure, the second potential of the second three-position four-way reversing valve 14 is electrified, the accumulator product is subjected to zero pressure, and the first potential and the second potential of the second overflow valve 16 and the second three-position four-way reversing valve 14 are alternately electrified and deenergized according to the technological requirements of the product, so that the high-low pressure circulation test of the accumulator product is completed. The embodiment has reasonable overall design, can accurately control the oil temperature, can reduce the use of low-temperature components, and adopts the scheme that the first overflow valve 15 and the second overflow valve 16 respectively control the system pressure and the flow, and has convenient operation, reliable performance, reasonable layout and easy maintenance.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The hydraulic system of the low-temperature high-pressure test bed is characterized by comprising a first hydraulic source, a throttle valve, a low-temperature refrigerating system, a first three-position four-way reversing valve, a second three-position four-way reversing valve, a first overflow valve and a second overflow valve; the output end of the first hydraulic source is connected with the throttle valve, the throttle valve is connected with the inlet end of the low-temperature refrigerating system, the outlet end of the low-temperature refrigerating system is connected with the P port of the first three-position four-way reversing valve, and the remaining T port, A port and B port of the first three-position four-way reversing valve are respectively connected with the oil return end of the first hydraulic source, the rodless cavity of the actuator and the rod cavity of the actuator;
The P port, the T port, the A port and the B port of the second three-position four-way reversing valve are respectively connected with the outlet end of the low-temperature refrigerating system, the oil return end of the first hydraulic source, the pressure accumulator and the oil return end of the first hydraulic source;
An oil inlet of the first overflow valve is connected with an output end of the first hydraulic source, and an oil outlet of the first overflow valve is connected with an oil return end of the first hydraulic source;
An oil inlet of the second overflow valve is connected with an outlet end of the low-temperature refrigerating system, and an oil outlet of the second overflow valve is connected with an oil return end of the first hydraulic source.
2. The low temperature, high pressure bench hydraulic system of claim 1, further comprising a first two-way valve and a third relief valve, wherein the first two-way valve is connected in parallel with the first relief valve and the third relief valve is connected in parallel with the first two-way valve.
3. The low temperature high pressure test stand hydraulic system of claim 1, further comprising a second two-position two-way valve disposed on a path of the second relief valve connecting the low temperature refrigeration system.
4. The low temperature and high pressure bench hydraulic system of claim 1, further comprising a check valve and a first high pressure filter, wherein the check valve and the first high pressure filter are both connected in series on a path of the first hydraulic source connected to the throttle valve.
5. The low temperature and high pressure bench hydraulic system according to claim 1, further comprising a water cooler and a second high pressure filter disposed at an oil return end of the first hydraulic source for treating hydraulic oil flowing back from the first relief valve and the second relief valve to the first hydraulic source.
6. The low temperature and high pressure test stand hydraulic system of claim 1, further comprising a motor, a thermometer and a pressure gauge, wherein the motor, the thermometer and the pressure gauge are all connected in series on a path of the low temperature refrigeration system connected with the first three-position four-way reversing valve.
7. The low-temperature high-pressure test bed hydraulic system according to claim 1, wherein the first hydraulic source comprises a first oil tank, a first hydraulic pump, a first oil suction filter, a first liquid level thermometer, a first liquid level control relay, a temperature transmitter and a first air filter, one end of the first hydraulic pump is connected with the first oil suction filter arranged in the first oil tank, the other end of the first hydraulic pump is connected with the throttle valve, and the first liquid level thermometer, the first liquid level control relay, the temperature transmitter and the first air filter are all arranged on the first oil tank.
8. The low temperature high pressure test stand hydraulic system of claim 1, further comprising a second hydraulic source, a first hydrostatic interface, a second hydrostatic interface, a third hydrostatic interface, and a visible hydrostatic fluid column; the input ends of the first static pressure interface, the second static pressure interface and the third static pressure interface are combined into a passage and are connected with the output end of the second hydraulic pressure source, and the input end of the visible static pressure liquid column is connected with the combined passage of the first static pressure interface, the second static pressure interface and the third static pressure interface and the oil return end of the second hydraulic pressure source.
9. The hydraulic system of the low-temperature high-pressure test bed according to claim 8, wherein the output end of the second hydraulic source is provided with a first switch, and the passage for connecting the visible hydrostatic column with the second hydraulic source is provided with a second switch.
10. The hydraulic system of claim 8, wherein the second hydraulic source comprises a second oil tank, a second hydraulic pump, a second oil suction filter, a second liquid level thermometer, a second liquid level control relay and a second air filter, one end of the second hydraulic pump is connected with the second oil suction filter arranged in the second oil tank, the other end is connected with the input end merging passages of the first static pressure interface, the second static pressure interface and the third static pressure interface, and the second liquid level thermometer, the second liquid level control relay and the second air filter are all arranged on the second oil tank.
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| CN202322761097.5U CN221195558U (en) | 2023-10-13 | 2023-10-13 | Hydraulic system of low-temperature high-pressure test bed |
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| CN202322761097.5U CN221195558U (en) | 2023-10-13 | 2023-10-13 | Hydraulic system of low-temperature high-pressure test bed |
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