CN214149814U - Variable pump low-temperature test system - Google Patents
Variable pump low-temperature test system Download PDFInfo
- Publication number
- CN214149814U CN214149814U CN202120450291.XU CN202120450291U CN214149814U CN 214149814 U CN214149814 U CN 214149814U CN 202120450291 U CN202120450291 U CN 202120450291U CN 214149814 U CN214149814 U CN 214149814U
- Authority
- CN
- China
- Prior art keywords
- temperature
- heat
- heat exchanger
- pump
- variable pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The utility model discloses a variable pump low temperature test system, including supplying oil tank, conduction oil refrigeration accuse temperature unit and temperature controller, supply oil tank to have connected gradually low-pressure centrifugal pump through medium circulation pipe head and the tail, first heat exchanger, the second switching-over valve, a temperature sensor, the variable pump that awaits measuring, second heat exchanger and second temperature sensor, conduction oil refrigeration accuse temperature unit has connected gradually the heat conduction oil pump through conduction oil circulation pipeline head and the tail, first heat exchanger, three way type governing valve and second heat exchanger, medium circulation pipe between first heat exchanger and the second switching-over valve and the medium circulation pipe between variable pump that awaits measuring and the second heat exchanger have first switching-over valve through circulation short circuit pipe connection. The test system can accurately control the inlet temperature of the variable pump and simultaneously quickly respond to the temperature change of the medium at the outlet of the variable pump, so that the temperature of the medium in the oil tank is kept in a stable range, and the fluctuation of the inlet temperature of the variable pump is reduced.
Description
Technical Field
The utility model relates to a hydraulic pump performance detection area especially relates to a variable pump low temperature test system.
Background
In various environmental factors, the performance of the hydraulic pump is greatly influenced by the temperature of a medium, so that low-temperature tests are required to be carried out on the hydraulic pump in stages of design, setting, detection and the like so as to find out performance indexes of the hydraulic pump under various temperature conditions. The existing low-temperature test system generally refrigerates a medium in a whole oil tank to a required temperature, and then supplies the medium to a hydraulic pump for low-temperature test, namely the inlet temperature of the hydraulic pump is ensured by the temperature of the medium in the oil tank. However, if the hydraulic pump to be tested is a variable displacement pump, the heat generation of the pump will change along with the change of the displacement of the pump, and a large part of the heat generation of the pump will be carried away by the working medium flowing through the pump. Particularly for a heavy-load and high-pressure variable pump, the temperature of a medium after the pump is tested at a low temperature is often increased by more than 10 ℃ than that before the pump, and under the condition, if the temperature fluctuation of an outlet medium caused by the working condition change of the variable pump is not controlled, the temperature fluctuation of the part can be quickly transmitted to a working medium in an oil tank, so that the accuracy of a test result is adversely affected.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem that prior art exists, the utility model aims to provide a variable pump low temperature test system through two heat exchangers of establishing ties of one set of conduction oil refrigerating unit complex, can be in the quick response variable pump export medium temperature change of accurate control variable pump inlet temperature for medium temperature keeps in a more stable range in the oil tank, thereby reduces variable pump inlet temperature fluctuation, guarantees the test result accuracy.
In order to solve the technical problem, the utility model discloses a technical scheme as follows: a variable pump low-temperature test system comprises an oil supply tank, a heat-conducting oil refrigeration temperature control unit and a temperature controller, wherein the oil supply tank is sequentially connected with a low-pressure centrifugal pump, a first heat exchanger, a second reversing valve, a first temperature sensor, a variable pump to be tested, a second heat exchanger and a second temperature sensor through a medium circulating pipe end to end, the heat-conducting oil refrigeration temperature control unit is sequentially connected with a heat-conducting oil pump, the first heat exchanger, a three-way type regulating valve and the second heat exchanger through a heat-conducting oil circulating pipeline end to end, the three-way type regulating valve is connected with the input end of the heat-conducting oil refrigeration temperature control unit through a heat-conducting oil circulating pipeline branch, a one-way valve is connected to a branch of a heat-conducting oil circulating pipeline of the heat-conducting oil refrigeration temperature control unit, a medium circulating pipe between the first heat exchanger and the second reversing valve and a medium circulating pipe between the, the first temperature sensor and the second temperature sensor are both connected with the input end of the temperature controller, and the three-way regulating valve and the heat conduction oil pump are both connected with the output end of the temperature controller.
As a further improvement, the heat conduction oil pump and the low-pressure centrifugal pump are low-temperature-resistant magnetic pumps.
As a further improvement of the present invention, the first heat exchanger and the second heat exchanger are plate heat exchangers.
As a further improvement of the utility model, the three-way type regulating valve is an equal percentage bit type regulating valve.
As a further improvement, the heat-conducting oil refrigeration temperature control unit is a cascade compressor refrigeration unit.
Compared with the prior art, the utility model, following beneficial effect has:
the utility model relates to a variable pump low temperature test system through two heat exchangers of establishing ties of one set of conduction oil refrigerating unit complex, can be in the quick response variable pump export medium temperature change of accurate control variable pump inlet temperature for medium temperature keeps in a more stable scope in the oil tank, thereby reduces variable pump inlet temperature fluctuation.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic flow chart of the present invention at the preparation stage;
fig. 3 is a schematic flow chart of the present invention at the formal testing stage.
In the drawings: 1. the device comprises an oil supply tank, 2, a heat conduction oil pump, 3, a low-pressure centrifugal pump, 4, a first heat exchanger, 5, a first reversing valve, 6, a circulation short-circuit pipeline, 7, a second reversing valve, 8, a first temperature sensor, 9, a variable pump to be detected, 10, a second temperature sensor, 11, a medium circulation pipe, 12, a second temperature sensor, 13, a heat conduction oil circulation pipeline, 14, a temperature controller, 15, a three-way type regulating valve, 16, a heat conduction oil refrigeration temperature control unit, 17 and a one-way valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the utility model relates to a variable pump low temperature test system, including supplying oil tank 1, conduction oil refrigeration temperature control unit 16 and temperature controller 14, supply oil tank 1 to have connected gradually low-pressure centrifugal pump 3, first heat exchanger 4, second switching-over valve 7, first temperature sensor 8, the variable pump 9 that awaits measuring, second heat exchanger 10 and second temperature sensor 12 through medium circulating pipe 11 end to end, the medium that supplies in the oil tank 1 loops through low-pressure centrifugal pump 3, first heat exchanger 4, second switching-over valve 7 and the variable pump 9 access connection that awaits measuring, and the medium that awaits measuring the outlet of variable pump 9 gets back to supplying oil tank 1 after flowing through second heat exchanger 10. The first temperature sensor 8 is arranged on a medium circulating pipe 11 between the second reversing valve 7 and the inlet of the variable pump 9 to be measured, and is used for measuring the inlet temperature of the variable pump 9 to be measured. A second temperature sensor 12 is installed on the medium circulation pipe 11 between the second heat exchanger 10 and the oil supply tank 1 to measure the outlet temperature of the second heat exchanger 10.
The heat conduction oil refrigeration temperature control unit 16 is sequentially connected with a heat conduction oil pump 2, a first heat exchanger 4, a three-way type adjusting valve 15 and a second heat exchanger 10 end to end through a heat conduction oil circulation pipeline 13, the three-way type adjusting valve 15 is connected with the input end of the heat conduction oil refrigeration temperature control unit 16 through a heat conduction oil circulation pipeline branch, the three-way type adjusting valve 15 is connected with a one-way valve 17 on the heat conduction oil circulation pipeline branch flowing to the heat conduction oil refrigeration temperature control unit 16, heat conduction oil is divided into two strands behind the three-way adjusting valve 15, one strand directly returns to the heat conduction oil refrigeration temperature control unit 16, the other strand flows through the second heat exchanger 10 and then returns to the heat conduction oil refrigeration temperature control unit 16, and the three-way adjusting valve 15 receives an instruction of a temperature controller 14 to change the opening degree, so that the flow of the heat conduction oil flowing through the second heat exchanger 10 is changed. The heat conduction oil pump 2 is provided with a frequency conversion speed regulation function and receives an instruction of the temperature controller 14 to change the flow of the heat conduction oil. The flow rate of the heat-conducting oil supplied by the heat-conducting oil temperature control unit 16 is determined by the heat-conducting oil pump 2, and the three-way regulating valve 15 has the function of heat-conducting oil flow rate distribution in the whole system, and determines how much heat-conducting oil enters the second heat exchanger 10 to exchange heat with the working medium.
The medium circulating pipe 11 between the first heat exchanger 4 and the second reversing valve 7 and the medium circulating pipe 11 between the variable pump 9 to be tested and the second heat exchanger 10 are connected with the first reversing valve 5 through the circulating short-circuit pipeline 6, the first temperature sensor 8 and the second temperature sensor 12 are both connected with the input end of the temperature controller 14, and the three-way regulating valve 15 and the heat conduction oil pump 2 are both connected with the output end of the temperature controller 14. The temperature controller 14 respectively collects the temperatures of the first temperature sensor 8 and the second temperature sensor 12, compares the temperatures with a set target inlet control temperature of the variable pump 9 to be measured and a set target outlet control temperature of the second heat exchanger 10, and outputs corresponding control quantities through a PID control algorithm to adjust the rotating speed of the heat conduction oil pump 2 and the opening of the three-way regulating valve 15, so that the inlet temperature of the variable pump 9 to be measured and the outlet temperature of the second heat exchanger 10 are stabilized at the control target values.
Specifically, the heat-conducting oil pump 2 and the low-pressure centrifugal pump 3 are both low-temperature-resistant magnetic pumps, so that the service life of the pumps is prolonged.
Specifically, the first heat exchanger 4 and the second heat exchanger 10 are both plate heat exchangers, and the plate heat exchangers are large in heat exchange area and high in heat exchange efficiency, and are beneficial to controlling the temperature of a medium at the outlet of the heat exchangers.
Specifically, the three-way type regulating valve 15 is an equal-percentile regulating valve to ensure the regulating accuracy in different valve openings.
Specifically, the heat-conducting oil refrigeration temperature control unit 16 is a cascade compressor refrigeration unit, adopts a cascade compressor for refrigeration, can quickly adjust the temperature of a liquid supply port, and ensures that the temperature of the heat-conducting oil supplied to the first heat exchanger 4 is stabilized at a set value.
The test method applied to the variable pump low-temperature test system comprises the following steps,
the method comprises the following steps: setting the test temperature in advance
Setting a control target temperature Tin at the inlet of the variable pump 9 to be detected and a control target temperature Tout at the outlet of the second heat exchanger 10 through a temperature controller 14, wherein Tout = Tin +5 ℃;
setting the temperature T of the heat transfer oil supply through the heat transfer oil refrigeration temperature control unit 16The guide rail is arranged on the upper surface of the guide rail,wherein T isGuide tube=Tin-10℃；
Step two: preparation phase of the test
As shown in fig. 2, at this stage, the conduction oil refrigeration temperature control unit 16, the conduction oil pump 2, the low-pressure centrifugal pump 3 and the first reversing valve 5 are opened, the second reversing valve 7 is closed, the three-way regulating valve 15 is controlled by the temperature controller 14 to open the second heat exchanger 10 to be regulated to the maximum position, and the opening of the three-way regulating valve 15 to the input end of the conduction oil refrigeration temperature control unit 16 is closed;
the purpose of this stage is to allow the medium in the oil supply tank 1 to exchange heat with the low-temperature heat conduction oil supplied by the heat conduction oil refrigeration temperature control unit 16 through the first heat exchanger 4 and the second heat exchanger 10 so as to quickly reduce the temperature of the medium in the oil supply tank 1, wherein the temperature of the medium in the oil supply tank 1 is approximately equal to the temperature at the second temperature sensor 12, namely the temperature at the outlet of the second heat exchanger 10;
therefore, when Tout = Tin +5 ℃, the medium temperature in the oil supply tank 1 can be approximately considered to reach Tin +5 ℃, and the test preparation stage is finished;
step three: formal testing phase
As shown in fig. 3, at this stage, the heat-conducting oil refrigeration temperature control unit 16, the heat-conducting oil pump 2, the low-pressure centrifugal pump 3 and the second reversing valve 7 are opened, the first reversing valve 5 is closed, the opening degree of the three-way regulating valve 15 to the second heat exchanger 10 and the opening degree of the three-way regulating valve 15 to the input end of the heat-conducting oil refrigeration temperature control unit 16 are both opened under the control of the temperature controller 14, the heat-conducting oil pump 2 and the three-way regulating valve 15 regulate the flow rate of the heat-conducting oil to the first heat exchanger 4 and the second heat exchanger 10 in real time under the control of the temperature controller 14, and thus the temperatures of the inlet of the variable pump 9 to be measured and the outlet of the second heat exchanger 10 are ensured to be stabilized near the control target value;
for the three-way regulating valve 15, assuming that the flow rate of the inlet is Q1, the flow rate of the outlet of the three-way regulating valve 15 through the second heat exchanger 10 is Q2, the outlet flow rate of the three-way regulating valve 15 to the input end of the heat-conducting oil refrigeration and temperature control unit 16 is Q3, and Q1= Q2+ Q3;
when Tout is greater than Tin +5 ℃, the temperature controller 14 controls the flow of the heat conduction oil pump 2 to be increased, the valve opening of the control three-way regulating valve 15 passing through the second heat exchanger 10 is increased (namely Q2 is increased), and the valve opening of the control three-way regulating valve 15 leading to the input end of the heat conduction oil refrigeration and temperature control unit 16 is decreased (namely Q3 is decreased);
when Tout < Tin +5 ℃, the temperature controller 14 controls the flow rate of the thermal oil pump 2 to become small (i.e., Q2 becomes small), and controls the valve opening of the three-way regulating valve 15 through the second heat exchanger 10 to decrease (i.e., Q3 becomes large);
when Tout = Tin +5 ℃, the temperature controller 14 controls the flow of the heat conducting oil pump 2 to be unchanged, and controls the opening of the three-way regulating valve 15 through the valve of the second heat exchanger 10 to be unchanged;
in the formal testing stage, the outlet temperature of the variable displacement pump 9 to be tested rises due to heating, the outlet medium temperature fluctuates due to working condition change, and if the first temperature sensor 8 detects that the medium temperature fluctuates and then adjusts the flow of the low-temperature heat-conducting oil entering the first heat exchanger 7 through the heat-conducting oil pump 2, large hysteresis exists. Therefore, the utility model discloses second heat exchanger 10 has been established ties behind the variable pump 9 that awaits measuring, the conduction oil that flows through first heat exchanger 4 is after the medium heat transfer with low-pressure centrifugal pump 3 after, the temperature still can be less than Tin, consequently still has certain refrigerating capacity, so continue to lead this part conduction oil to second heat exchanger 10 and cool off the variable pump 9 export medium that awaits measuring, the temperature behind the variable pump 9 export medium that awaits measuring flows through second heat exchanger 10 is then controlled by the aperture size that three-way control valve 15 was adjusted to temperature controller 14;
in the formal test process, the temperature controller 14 adjusts the opening degree of the three-way regulating valve 15 so that the temperature after the second heat exchanger 10 (i.e., the temperature at the second temperature sensor 12) is always maintained at Tout = Tin +5 ℃, which can ensure that the temperature of the medium in the oil supply tank 1 is kept in a relatively stable range, thereby reducing the interference of the working condition change of the variable pump 9 to be tested on the temperature of the medium in the oil supply tank 1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The variable pump low-temperature test system is characterized in that: the oil supply tank (1) is sequentially connected with a low-pressure centrifugal pump (3), a first heat exchanger (4), a second reversing valve (7), a first temperature sensor (8), a variable pump (9) to be detected, a second heat exchanger (10) and a second temperature sensor (12) end to end through a medium circulating pipe (11), the heat-conducting oil refrigeration temperature control unit (16) is sequentially connected with a heat-conducting oil pump (2), the first heat exchanger (4), a three-way regulating valve (15) and the second heat exchanger (10) end to end through a heat-conducting oil circulating pipeline (13), the three-way regulating valve (15) is connected with an input end of the heat-conducting oil refrigeration temperature control unit (16) through a heat-conducting oil circulating pipeline branch, and the three-way regulating valve (15) is connected with a one-way valve (17) on the heat-conducting oil circulating pipeline branch flowing to the heat-conducting oil refrigeration temperature control unit (16), the medium circulating pipe (11) between the first heat exchanger (4) and the second reversing valve (7) and the medium circulating pipe (11) between the measuring variable pump (9) and the second heat exchanger (10) are connected with the first reversing valve (5) through a circulating short-circuit pipeline (6), the first temperature sensor (8) and the second temperature sensor (12) are connected with the input end of a temperature controller (14), and the three-way regulating valve (15) and the heat conduction oil pump (2) are connected with the output end of the temperature controller (14).
2. The variable displacement pump cryogenic test system of claim 1, wherein: the heat conduction oil pump (2) and the low-pressure centrifugal pump (3) are both low-temperature-resistant magnetic pumps.
3. The variable displacement pump cryogenic test system of claim 1, wherein: the first heat exchanger (4) and the second heat exchanger (10) are both plate heat exchangers.
4. The variable displacement pump cryogenic test system of claim 1, wherein: the three-way type regulating valve (15) is an equal-percentile regulating valve.
5. The variable displacement pump cryogenic test system of claim 1, wherein: the heat-conducting oil refrigeration temperature control unit (16) is a cascade compressor refrigeration unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120450291.XU CN214149814U (en) | 2021-03-02 | 2021-03-02 | Variable pump low-temperature test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120450291.XU CN214149814U (en) | 2021-03-02 | 2021-03-02 | Variable pump low-temperature test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214149814U true CN214149814U (en) | 2021-09-07 |
Family
ID=77553834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120450291.XU Active CN214149814U (en) | 2021-03-02 | 2021-03-02 | Variable pump low-temperature test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214149814U (en) |
-
2021
- 2021-03-02 CN CN202120450291.XU patent/CN214149814U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112924487B (en) | System for testing boiling heat exchange of two-phase flow in pipe and control method | |
| CN111397257B (en) | Temperature control device and method | |
| CN105066341A (en) | Variable water temperature control system suitable for air conditioning secondary pump system | |
| CN111810396A (en) | Low-temperature detection system and method for hydraulic pump | |
| CN112326535B (en) | Hydraulic filter low-temperature test system and detection method thereof | |
| CN214149814U (en) | Variable pump low-temperature test system | |
| CN212296830U (en) | Low-temperature detection system for hydraulic pump | |
| CN210370836U (en) | Automatic engine oil temperature adjusting device | |
| CN109974320B (en) | High-temperature deionized water cooling device | |
| CN110907121A (en) | Wind tunnel heat exchange system | |
| CN112857780A (en) | Variable pump low-temperature test system and detection method thereof | |
| CN113675433B (en) | Multi-mode fuel cell test bench thermal management system and control method thereof | |
| CN115016567A (en) | Method and system for controlling temperature of bottom plate in vacuum low-temperature environment | |
| TWI718985B (en) | Multi-stage heat pump performance test system | |
| CN211950650U (en) | Engine coolant constant temperature device for low-temperature environment simulation test | |
| CN204987365U (en) | Become water temperature control system suitable for air conditioner one -level pumping system | |
| CN209655821U (en) | A kind of circulating water cooling system | |
| CN109186091B (en) | Cooling medium supply device and control method | |
| CN220338600U (en) | Temperature control system and air conditioner | |
| CN219832713U (en) | Circulating water cooling device of fuel cell test system | |
| CN220083362U (en) | System for be used for cooling tower test heat supply and computer lab to supply cold | |
| CN113532899B (en) | Inlet oil and water temperature stabilizing device for low-power heat radiation performance test | |
| CN209976614U (en) | Device for automatically controlling temperature of auxiliary water channel of supercharged engine by rack | |
| CN213841383U (en) | High-precision energy self-adaptive cooling unit | |
| CN220524251U (en) | Air conditioner and temperature regulating system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |