Pressure regulation and control system and method for pipeline inner-cooling type rotor evaporative cooling experiment platform

Abstract

The invention provides a pressure regulation and control system and method for a pipeline inner-cooling type rotor evaporative cooling experiment platform. The system comprises a pressure regulation and control device and a liquid amount regulation and control device. The pressure regulation and control device is mounted on the side wall surface, close to an inlet, of the condenser, and the liquid quantity regulation and control device is mounted at an inlet of a cooling pipeline; the pressure regulation and control device realizes regulation and control of pressure in the pipe through cooperative action of an internal electromagnetic valve and a piston, and the liquid quantity regulation and control device realizes regulation and control of liquid quantity through combination of movement of the internal piston and centrifugal acceleration generated by rotation. The device can fully recover the working medium after the experiment is finished, greatly reduces the working medium waste caused by evaporation due to the fact that a large amount of working medium impacts the bottom of a collection vessel and flows violently during liquid discharge compared with the previous experiment process, and increases the boundary conditions of the rotor evaporative cooling experiment, thereby promoting the research of the rotor evaporative cooling mechanism.

Description

Technical Field

[0001] The invention belongs to the field of pressure regulation of evaporative cooling systems, and in particular relates to a pressure regulation system and method for a pipeline inner-cooling rotor evaporative cooling experimental platform. Background Art

[0002] Hydro-turbine generators are developing towards large capacity and high speed. In order to meet the needs of improving power generation efficiency and reducing operating costs, the capacity of a single unit and the capacity per pole must be further increased. As the capacity per pole of the generator increases, the problem of rotor heating becomes more serious, and the temperature rise problem needs to be solved urgently. The rotor of the hydro-turbine generator is close to the axis of the generator, the space is limited, and it is in a rotating state, so it is difficult to add large cooling equipment to effectively cool it. The traditional air cooling method can only be applied to low-speed hydro-turbine generators, which is difficult to meet the cooling needs of high-speed and large-capacity hydro-turbine generators required by the current national hydropower development.

[0003] Evaporative cooling technology is a new cooling technology that has emerged in recent years. It is particularly suitable for small spaces, large heat flux density, and uneven temperature distribution. Compared with water cooling solutions, the cooling medium used in evaporative cooling technology is a fluorocarbon compound with an appropriate boiling point. It is non-toxic, non-polluting, non-corrosive to metals and other motor parts, and has excellent insulation, fire prevention, and arc extinguishing properties. In addition, the self-circulating evaporative cooling system is relatively simple in complexity and highly reliable.

[0004] The evaporative cooling technology of the rotor with inner pipe cooling is to embed the cooling pipe into the rotor pole coil, and introduce fluorocarbon compounds as the cooling medium. The liquid medium changes phase and boils to become a gaseous medium, and uses the principle of latent heat of phase change to take away the heat from the coil.

[0005] In order to study the rotor evaporative cooling technology, a pipeline-cooled rotor evaporative cooling experimental platform was established to provide a rotating environment. The basic cycle principle of the pipeline-cooled rotor evaporative cooling experimental platform is as follows: Figure 1 As shown, it includes a gas collecting pipe 1, an upper pipe joint 2, a condenser 5, a cooling pipe 6, a lower pipe joint 7, a liquid return pipe 8, a first pressure sensor 13, a second pressure sensor 14, a temperature sensor 15, an exhaust valve 16, a drain valve 17, and a rotating shaft 100. The whole experimental platform rotates synchronously with the rotating shaft 100. Due to the effect of centrifugal acceleration, the evaporative cooling medium flows from the condenser 5 through the liquid return pipe 8 into the cooling pipe 6, absorbs heat and boils in the cooling pipe 6. The density of the gaseous evaporative cooling medium is much lower than that of the liquid medium. Therefore, a pressure difference is formed at the inlet and outlet of the cooling pipe 6, which drives the two-phase medium to flow toward the gas collecting pipe 1. The gaseous medium enters the condenser 5 and completes the circulation process. Since the average density of the two-phase medium in the gas collecting pipe 1 is lower than the density of the single-phase medium in the liquid return pipe 8, the liquid medium in the liquid return pipe 8 is more significantly affected by the centrifugal acceleration, thus forming a self-circulating flow of the overall loop.

[0006] The general process of the rotor evaporative cooling experiment is divided into: filling, preheating and exhausting, experiment, and draining. Among them, the processes that are more difficult and prone to errors are filling and exhausting, which directly affect the accuracy of the experiment. At the same time, during the experiment, the pressure in the cooling pipe 6 should be monitored and regulated in real time to prevent excessive pressure in the pipe from affecting the safety of the experiment.

[0007] During the filling process, because the boiling point of the working fluid is low, the use of drainage, pumping, injection and other filling methods to fill the fluid from the exhaust valve 16 cannot prevent the working fluid from evaporating and losing during the filling process, resulting in the actual filling volume being less than the expected value, affecting the experimental accuracy. At the same time, since the cooling pipe 6 and the condenser 5 are both made of opaque materials, the liquid level in the overall circulation loop is not easy to observe, which also poses a huge challenge to accurate filling.

[0008] The purpose of preheating the exhaust in the experiment is to exhaust the air inside the circulation loop, because air will not only hinder the circulation of the evaporative cooling working medium in the two-phase state, but also be a poor conductor of heat, affecting the heat transfer between the working medium and the inner wall of the cooling pipe 6. More importantly, the exhaust process will cause the inside of the circulation loop to be negative pressure at room temperature, the pressure in the cooling pipe 6 will decrease, the boiling point of the working medium will decrease accordingly, and the working medium will be easier to reach the boiling state.

[0009] When the current in-pipe cooling rotor evaporative cooling experimental platform is preheated and exhausted, the experimental platform is first put into a rotating state, and then the cooling pipeline 6 is heated. Once the pressure in the pipe rises to a value close to the set threshold, the rotation and heating process of the experimental platform is stopped. Afterwards, it is necessary to wait for the experimental platform to be completely still, and then manually open the exhaust valve 16, and then manually close the exhaust valve 16 to complete the exhaust operation after the heated air gushes out. This exhaust method is more troublesome and cannot guarantee the complete exhaust of air. Moreover, when the exhaust valve 16 is opened, since the heating of the cooling pipeline 6 is stopped, the entire experimental pipeline is actually exhausting and cooling down at the same time. At this time, the internal pressure is reduced, and a small amount of air may be sucked back into the pipeline system, affecting the experiment.

[0010] After the experiment, it is necessary to drain the working fluid in the pipeline of the internal-pipe-cooled rotor evaporative cooling experimental platform. The general process is to wait until the experimental platform stops heating and rotating and is in a static state, and then drain from the drain valve 17 at the lowest point of the overall circulation pipeline. This drainage method has some disadvantages: since the experimental pipeline is usually wrapped with an insulation layer, the pipeline has a great thermal inertia. Opening the valve will expose the working fluid in the pipeline to the air, and these working fluids are likely to evaporate, thereby wasting part of the working fluid. On the other hand, when draining from the drain valve 17, the working fluid flows out violently from a single valve and impacts the bottom of the collecting vessel. During this intense flow process, the contact area between the working fluid and the air increases, and it may also evaporate. Therefore, the traditional drainage process is often accompanied by inevitable loss of working fluid.

[0011] Since the boiling point of the working fluid changes with pressure, the pressure in the cooling pipe 6 of the pipeline-cooled rotor evaporative cooling experimental platform has a great influence on the evaporative cooling effect. In some experimental conditions, the pressure in the cooling pipe 6 is too high for various reasons, resulting in the working fluid temperature being below the boiling point. The cooling system actually operates in a single-phase convection mode, and the cooling effect is greatly reduced.

[0012] In addition, Chinese patent CN206726063U (Pressure control device and cooling device for cooling equipment) discloses a pressure control device for cooling equipment, which is used in the field of wind power generation. However, this device is only applicable to stationary equipment and stationary circulation systems, and is not applicable to equipment that needs to be cooled in a rotating state. In addition, the driving principle of the pressure control device is pump drive, and its application in a rotating environment will expose defects such as too many pipelines, complex systems, and heavy equipment, and is not suitable for application on rotating parts. Summary of the invention

[0013] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a pressure control system and method for a pipeline inner-cooled rotor evaporative cooling experimental platform.

[0014] In order to achieve the above object, the present invention adopts the following technical scheme:

[0015] A pressure control system for an in-pipe cooled rotor evaporative cooling experimental platform comprises a pressure control device and a liquid quantity control device; the pressure control device is installed on the side wall surface near the inlet of a condenser, and the liquid quantity control device is installed at the inlet of a cooling pipe; the pressure control device realizes pressure control in the pipe through the coordinated action of an internal electromagnetic valve and a piston, and the liquid quantity control device realizes liquid quantity control through the centrifugal acceleration generated by the internal piston movement combined with rotation.

[0016] Furthermore, the pipeline-cooled rotor evaporative cooling experimental platform includes an air collecting pipe, an upper pipeline joint, an upper solenoid valve, a pressure regulating device, a condenser, a cooling pipeline, a lower pipeline joint, a liquid return pipe, a liquid volume regulating device, a lower solenoid valve, a pressure regulating pipe, a liquid volume regulating pipe, a first pressure sensor, a second pressure sensor, a temperature sensor, and a rotating shaft; the air collecting pipe connects the upper end of the upper pipeline joint with the inlet of the condenser; the upper pipeline joint is installed with a first pressure sensor and a temperature sensor; the lower end of the upper pipeline joint is connected to the upper end of the cooling pipeline; the lower end of the cooling pipeline The end is connected with the upper end of the lower pipe joint; a second pressure sensor is installed in the lower pipe joint to realize real-time measurement of the pressure in the lower pipe joint; an opening is added to the lower pipe joint along the radial direction of the rotor away from the rotating shaft to connect the lower solenoid valve, and the lower solenoid valve and the liquid quantity control device are connected through a liquid quantity control pipe; the lower end of the lower pipe joint is connected to the lower outlet of the condenser through a return liquid pipe; an opening is added at the upper inlet of the condenser to be connected with the upper solenoid valve; the upper solenoid valve and the pressure control device are connected through the pressure control pipe; the upper inlet of the condenser is connected to the gas collecting pipe.

[0017] Furthermore, the pressure regulating device includes a first shell, a first piston, a first micro electromagnetic valve, a second micro electromagnetic valve, and a first electromagnetic actuator; the pressure regulating device is connected to the external pipeline along the rotor radial direction through the pressure regulating tube of the pipeline-cooled rotor evaporative cooling experimental platform; the shell is responsible for packaging and sealing the entire device; the first electromagnetic actuator is extended and shortened as needed, and the first electromagnetic actuator is connected to and drives the first piston to achieve the division of the inner cavity of the pressure regulating device into two mutually sealed cavities when the first micro electromagnetic valve is closed; the first micro electromagnetic valve is installed on the first piston, and the second micro electromagnetic valve is installed on the shell, both of which can be opened and closed as needed.

[0018] Furthermore, the liquid quantity control device includes a second shell, a second piston, a second electromagnetic actuator, a liquid injection valve, and a vent; the liquid quantity control device is connected to the external pipeline through the liquid quantity control pipe of the pipeline-cooled rotor evaporative cooling experimental platform; the second shell is responsible for protecting the internal components of the device and ensuring the sealed environment inside the device; the second piston is responsible for dividing the internal cavity of the device into two mutually sealed cavities, and the second electromagnetic actuator is extended or shortened as needed to push or pull the second piston; the liquid injection valve is used for filling liquid, and is opened during filling, and the working medium is poured into the liquid injection valve; the vent is located on the side of the second shell along the radial direction of the rotor away from the rotating shaft, and does not affect the air tightness of the sealed cavity formed by the second piston and the part of the second shell on the side of the rotor radially close to the rotating shaft.

[0019] Furthermore, even when the second electromagnetic actuator reaches the maximum stroke, the position of the second piston in the liquid volume control device will not exceed the injection valve, so that the liquid injected by the injection valve is always pushed into the liquid volume control tube by the second piston.

[0020] Furthermore, the liquid volume control device adopts a hard shell, or uses a liquid bag or an air bag, and contracts and expands through a squeezing device.

[0021] Furthermore, the liquid volume control device and the pressure control device change the volume by using an electromagnetic actuator to push a piston or by using a hydraulic method to drive a piston.

[0022] The present invention also provides a pressure control method for a pipeline-cooled rotor evaporative cooling experimental platform, comprising: during the filling process, the pipeline-cooled rotor evaporative cooling experimental platform is in a static and unheated state, the lower electromagnetic valve connected to the liquid quantity control tube is closed, the second piston inside the liquid quantity control device is in a maximum stroke position that the second electromagnetic actuator can reach in a direction away from one side of the rotating shaft along the radial direction of the rotor, the first piston inside the pressure control device is in a maximum stroke position that the first electromagnetic actuator can reach in a direction away from one side of the rotating shaft along the radial direction of the rotor, the liquid filling valve is opened to fill the interior of the liquid quantity control device with a working medium, and then the liquid filling valve is re-closed, the upper electromagnetic valve connected to the pressure control tube is opened, the first micro electromagnetic valve and the second micro electromagnetic valve in the pressure control device are opened, and then the lower electromagnetic valve connected to the liquid quantity control tube is opened, and the second electromagnetic actuator inside the liquid quantity control device pushes the second piston to the bottom in a direction close to the rotating shaft in the radial direction of the rotor, and all the working medium is injected into the circulation pipeline of the pipeline-cooled rotor evaporative cooling experimental platform through the liquid quantity control tube;

[0023] After the filling is completed, the lower solenoid valve connected to the liquid volume control tube is closed, then the upper solenoid valve connected to the pressure control tube is closed, and finally the first micro solenoid valve and the second micro solenoid valve in the pressure control device are closed.

[0024] Furthermore, during the preheating exhaust process, the in-pipe cooled rotor evaporative cooling experimental platform is first placed in a stable rotation state, and then the wall of the cooling pipe is heated. When the pressure at the outlet of the cooling pipe reaches stability, the solenoid valve on the pressure regulating pipe is opened, and then the first micro solenoid valve and the second micro solenoid valve on the pressure regulating device are opened to allow the mixed gas of air and gaseous working fluid to flow out of the circulation pipeline through the pressure regulating device, and then the solenoid valve connected to the pressure regulating pipe is closed, followed by the first micro solenoid valve of the pressure regulating device, and finally the second micro solenoid valve is closed to restore the pipeline to a sealed state.

[0025] Furthermore, during the experiment, the temperature and pressure in the upper pipe joint at the outlet of the cooling pipe are monitored by the first pressure sensor and the temperature sensor. If, under a stable state, the temperature at the outlet of the cooling pipe is lower than the boiling point of the working fluid corresponding to the pressure here, the internal pressure of the circulation loop is reduced by the pressure control device according to the experimental needs, so that the working fluid can more easily reach boiling, and it is recorded as a new experimental working condition; at the end of the experiment, the rotation of the pipeline-cooled rotor evaporative cooling experimental platform is maintained, the heating of the cooling pipe is stopped, the lower solenoid valve on the liquid quantity control pipe is opened first, and the second electromagnetic actuator in the liquid quantity control device drives the second piston to move along the radial direction of the rotor away from the rotating shaft. The working fluid will flow back into the liquid quantity control device under the action of centrifugal acceleration and the negative pressure in the liquid quantity control device, and then the upper solenoid valve on the pressure control pipe is opened, and then the first micro solenoid valve and the second micro solenoid valve on the pressure control device are opened to allow air to flow into the circulation pipeline, which will cause the residual working fluid to further flow into the liquid quantity control device, and finally the lower solenoid valve on the liquid quantity control pipe is closed to complete the working fluid recovery.

[0026] Beneficial effects:

[0027] (1) The present invention can prevent the occurrence of excessive pressure in previous experiments, thereby ensuring experimental safety.

[0028] (2) The present invention can simplify the exhaust process in previous experiments, and the exhaust is more complete, which can completely avoid the temperature back-absorption phenomenon caused by the decrease in the temperature of the cooling pipe.

[0029] (3) The present invention can realize accurate and fully automatic filling, which solves the problems of cumbersome filling process, fluid loss and poor precision in previous rotor evaporative cooling experiments. It can also accurately control the amount of liquid in the circulation pipeline, accurately determine the boundary conditions of the experiment, and reduce experimental errors.

[0030] (4) The present invention can fully recover the working fluid after the experiment is completed. Compared with the previous experimental process, it greatly reduces the waste of working fluid caused by a large amount of working fluid impacting the bottom of the collection vessel during drainage and evaporation due to violent flow.

[0031] (5) The present invention can increase the boundary conditions of the rotor evaporative cooling experiment, thereby promoting the research on the rotor evaporative cooling mechanism.

[0032] (6) The pressure control device at the outlet of the cooling pipe in the present invention is expected to be actually applied to the rotor evaporative cooling system of a future real machine, and serve as a forward-looking exploration to help the further development and application of rotor evaporative cooling technology in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the basic cycle principle of the rotating test bench for rotor evaporative cooling technology;

[0034] Figure 2 A schematic diagram of a pressure control system for a pipeline-cooled rotor evaporative cooling experimental platform according to an embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a pressure regulating device;

[0036] Figure 4 Schematic diagram of the liquid volume control device.

[0037] Among them, the accompanying drawings are marked as: gas collecting pipe 1, upper pipe joint 2, upper solenoid valve 3, pressure regulating device 4, condenser 5, cooling pipe 6, lower pipe joint 7, return liquid pipe 8, liquid volume regulating device 9, lower solenoid valve 10, pressure regulating pipe 11, liquid volume regulating pipe 12, first pressure sensor 13, second pressure sensor 14, temperature sensor 15, exhaust valve 16, drain valve 17, first shell 41, first piston 42, first micro solenoid valve 43, second micro solenoid valve 44, first electromagnetic actuator 45, second shell 91, second piston 92, second electromagnetic actuator 93, liquid injection valve 94, air vent 95, rotating shaft 100. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] like Figure 2 As shown, a pressure control system for a pipeline-cooled rotor evaporative cooling experimental platform according to an embodiment of the present invention includes a pressure control device and a liquid volume control device. The pressure control device is installed on the side wall surface near the inlet of the condenser, and the liquid volume control device is installed at the inlet of the cooling pipeline.

[0040] like Figure 2As shown, a pipeline-cooled rotor evaporative cooling experimental platform according to an embodiment of the present invention includes a gas collecting pipe 1, an upper pipeline joint 2, an upper solenoid valve 3, a pressure regulating device 4, a condenser 5, a cooling pipeline 6, a lower pipeline joint 7, a liquid return pipe 8, a liquid volume regulating device 9, a lower solenoid valve 10, a pressure regulating pipe 11, a liquid volume regulating pipe 12, a first pressure sensor 13, a second pressure sensor 14, a temperature sensor 15, and a rotating shaft 100. The gas collecting pipe 1 connects the upper end of the upper pipeline joint 2 with the inlet of the condenser 5. The upper pipeline joint 2 is equipped with a first pressure sensor 13 and a temperature sensor 15 to realize real-time measurement of temperature and pressure in the upper pipeline joint 2. The lower end of the upper pipeline joint 2 is connected to the upper end of the cooling pipeline 6. The lower end of the cooling pipeline 6 is connected to the upper end of the lower pipeline joint 7. The lower pipeline joint 7 is equipped with a second pressure sensor 14 to realize real-time measurement of pressure in the lower pipeline joint 7. An opening is added to the lower pipe joint 7 on the side of the rotor radially away from the rotating shaft 100, and the lower solenoid valve 10 is connected. The lower solenoid valve 10 is connected to the liquid quantity control device 9 through the liquid quantity control pipe 12. The lower end of the lower pipe joint 7 is connected to the lower end outlet of the condenser 5 through the liquid return pipe 8. An opening is added at the upper end inlet of the condenser 5, which is connected to the upper solenoid valve 3. The upper solenoid valve 3 is connected to the pressure control device 4 through the pressure control pipe 11. The upper end inlet of the condenser 5 is connected to the gas collecting pipe 1.

[0041] like Figure 3 As shown, the pressure regulating device 4 includes a first shell 41, a first piston 42, a first micro electromagnetic valve 43, a second micro electromagnetic valve 44, and a first electromagnetic actuator 45; the pressure regulating device 4 is connected to the external pipeline along the rotor radial direction through the pressure regulating tube 11; the first shell 41 is responsible for packaging and sealing the entire device; the first electromagnetic actuator 45 is extended and shortened as needed, and the first electromagnetic actuator 45 is connected to and drives the first piston 42, so that the inner cavity of the pressure regulating device 4 is divided into two mutually sealed cavities when the first micro electromagnetic valve 43 is closed; the first micro electromagnetic valve 43 is installed on the first piston 42, and the second micro electromagnetic valve 44 is installed on the shell, both of which can be opened and closed as needed.

[0042] like Figure 4As shown, the liquid quantity control device 9 includes a second shell 91, a second piston 92, a second electromagnetic actuator 93, a liquid injection valve 94, and a vent hole 95. The liquid quantity control device 9 is connected to the external pipeline through a liquid quantity control tube 12. The second shell 91 is responsible for protecting the internal components of the device and ensuring the sealed environment inside the device; the second piston 92 is responsible for dividing the internal cavity of the device into two mutually sealed cavities, and the second electromagnetic actuator 93 can be extended or shortened as needed to push or pull the second piston 92; the liquid injection valve 94 is used for filling liquid, and is opened during filling, and the working medium is poured into the liquid injection valve 94; the vent hole 95 is located on the side of the second shell 91 along the radial direction of the rotor away from the rotating shaft 100, and does not affect the air tightness of the sealed cavity formed by the second piston 92 and the second shell 91 on the side of the rotor radially close to the rotating shaft 100.

[0043] like Figure 4 As shown, even when the second electromagnetic actuator 93 reaches the maximum stroke, the position of the second piston 92 in the liquid quantity control device 9 will not exceed the injection valve 94, so that the liquid injected by the injection valve 94 can always be pushed into the liquid quantity control tube 12 by the second piston 92.

[0044] A pressure control method for a pipeline internal cooling rotor evaporative cooling experimental platform according to an embodiment of the present invention includes:

[0045] During the filling process, the pipeline-cooled rotor evaporative cooling experimental platform is in a static and unheated state, the lower solenoid valve 10 connected to the liquid quantity control tube 12 is closed, the second piston 92 inside the liquid quantity control device 9 is in the maximum stroke position that the second electromagnetic actuator 93 can reach along the rotor radially away from the rotating shaft 100 side, the first piston 42 inside the pressure control device 4 is in the maximum stroke position that the first electromagnetic actuator 45 can reach along the rotor radially away from the rotating shaft 100 side, the injection valve 94 is opened to fill the interior of the liquid quantity control device 9 with the working medium, and then the injection valve 94 is reclosed, the upper solenoid valve 3 connected to the pressure control tube 11 is opened, the first micro solenoid valve 43 and the second micro solenoid valve 44 in the pressure control device 4 are opened, and then the lower solenoid valve 10 connected to the liquid quantity control tube 12 is opened, and the second electromagnetic actuator 93 inside the liquid quantity control device 9 pushes the second piston 92 to the bottom in the direction of the rotor radially close to the rotating shaft 100, and all the working medium is injected into the circulation pipeline of the pipeline-cooled rotor evaporative cooling experimental platform through the liquid quantity control tube 12.

[0046] After the filling is completed, the lower solenoid valve 10 connected to the liquid volume control tube 12 is closed, and then the upper solenoid valve 3 connected to the pressure control tube 11 is closed, and finally the first micro solenoid valve 43 and the second micro solenoid valve 44 in the pressure control device 4 are closed.

[0047] During the preheating exhaust process, the pipeline-cooled rotor evaporative cooling experimental platform is first placed in a stable rotation state, and then the cooling pipeline wall is heated. When the pressure at the cooling pipeline outlet reaches stability, the solenoid valve on the pressure regulating tube 11 is opened, and then the first micro-electromagnetic valve 43 and the second micro-electromagnetic valve 44 on the pressure regulating device 4 are opened to allow the mixed gas of air and gaseous working fluid to flow out of the circulation pipeline through the pressure regulating device 4, and then the solenoid valve 3 connected to the pressure regulating tube 11 is closed, followed by the first micro-electromagnetic valve 43 of the pressure regulating device 4, and finally the second micro-electromagnetic valve 44 is closed to restore the pipeline to a sealed state.

[0048] During the experiment, the temperature and pressure in the upper pipe joint 2 at the outlet of the cooling pipe 6 are monitored by the first pressure sensor 13 and the temperature sensor 15. If, under stable conditions, the temperature at the outlet of the cooling pipe 6 is lower than the boiling point of the working fluid corresponding to the pressure here, the internal pressure of the circulation loop can be reduced by the pressure control device 4 according to experimental needs, so that the working fluid can boil more easily and be recorded as a new experimental working condition. The specific method is: keep the first micro solenoid valve 43 and the second micro solenoid valve 44 of the pressure control device 4 closed, open the upper solenoid valve 3 connected to the pressure control tube 11, and push the first piston 42 of the pressure control device 4 along the radial direction of the rotor toward the rotating shaft 100. After the pressure reaches the control target value, close the upper solenoid valve 3.

[0049] At the end of the experiment, the rotation of the pipeline-cooled rotor evaporative cooling experimental platform is maintained, and the heating of the cooling pipeline 6 is stopped. The lower solenoid valve 10 on the liquid quantity control tube 12 is opened first, and the second electromagnetic actuator 93 in the liquid quantity control device 9 drives the second piston 92 to move along the rotor radial direction away from the rotating shaft 100. The working fluid will flow back into the liquid quantity control device 9 under the action of centrifugal acceleration and the negative pressure in the liquid quantity control device 9. Then, the upper solenoid valve 3 on the pressure control tube 11 is opened, and then the first micro solenoid valve 43 and the second micro solenoid valve 44 on the pressure control device 4 are opened to allow air to flow into the circulation pipeline, which will cause the residual working fluid to further flow into the liquid quantity control device. Finally, the lower solenoid valve 10 on the liquid quantity control tube is closed to complete the working fluid recovery.

[0050] Preferably, in the present invention, the volume change of the liquid quantity control device and the pressure control device is achieved by using an electromagnetic actuator to push a piston. Based on the same principle, the piston can be driven hydraulically.

[0051] Preferably, the liquid volume control device in the present invention adopts a hard shell, and can also be in the form of a liquid bag or an air bag, which is contracted and expanded by an extrusion device.

Claims

1. A pressure control system for a pipeline-cooled rotor evaporative cooling experimental platform, characterized in that: It comprises a pressure regulating device and a liquid quantity regulating device; the pressure regulating device is installed on the side wall surface of the condenser near the inlet, and the liquid quantity regulating device is installed at the inlet of the cooling pipe; the pressure regulating device realizes pressure regulation in the pipe through the coordinated action of the internal electromagnetic valve and the piston, and the liquid quantity regulating device realizes liquid quantity regulation through the centrifugal acceleration generated by the internal piston movement combined with the rotation.

2. The pressure control system for the pipeline-cooled rotor evaporative cooling experimental platform according to claim 1 is characterized in that: The pipeline-cooled rotor evaporative cooling experimental platform comprises an air collecting pipe, an upper pipeline joint, an upper solenoid valve, a pressure regulating device, a condenser, a cooling pipeline, a lower pipeline joint, a liquid return pipe, a liquid volume regulating device, a lower solenoid valve, a pressure regulating pipe, a liquid volume regulating pipe, a first pressure sensor, a second pressure sensor, a temperature sensor, and a rotating shaft; the air collecting pipe is connected to the upper end of the upper pipeline joint and the inlet of the condenser; the upper pipeline joint is equipped with a first pressure sensor and a temperature sensor; the lower end of the upper pipeline joint is connected to the upper end of the cooling pipeline; the lower end of the cooling pipeline is connected to the The upper end of the lower pipe joint is connected; a second pressure sensor is installed in the lower pipe joint to realize real-time measurement of the pressure in the lower pipe joint; an opening is added to the lower pipe joint along the radial direction of the rotor away from the rotating shaft to connect the lower solenoid valve, and the lower solenoid valve is connected to the liquid quantity control device through a liquid quantity control pipe; the lower end of the lower pipe joint is connected to the lower outlet of the condenser through a return liquid pipe; an opening is added at the upper inlet of the condenser to be connected to the upper solenoid valve; the upper solenoid valve is connected to the pressure control device through the pressure control pipe; the upper inlet of the condenser is connected to the gas collecting pipe.

3. The pressure control system for the pipeline-cooled rotor evaporative cooling experimental platform according to claim 1 is characterized in that: The pressure regulating device includes a first shell, a first piston, a first micro electromagnetic valve, a second micro electromagnetic valve, and a first electromagnetic actuator; the pressure regulating device is connected to the external pipeline along the rotor radial direction through the pressure regulating pipe of the pipeline-cooled rotor evaporative cooling experimental platform; the shell is responsible for packaging and sealing the entire device; the first electromagnetic actuator is extended and shortened as needed, and the first electromagnetic actuator is connected to and drives the first piston to achieve the division of the inner cavity of the pressure regulating device into two mutually sealed cavities when the first micro electromagnetic valve is closed; the first micro electromagnetic valve is installed on the first piston, and the second micro electromagnetic valve is installed on the shell, both of which can be opened and closed as needed.

4. The pressure control system for the pipeline internal cooling rotor evaporative cooling experimental platform according to claim 1 is characterized in that: The liquid quantity control device includes a second shell, a second piston, a second electromagnetic actuator, a liquid injection valve, and a vent hole; the liquid quantity control device is connected to an external pipeline through a liquid quantity control pipe of a pipeline-cooled rotor evaporative cooling experimental platform; the second shell is responsible for protecting the internal components of the device and ensuring a sealed environment inside the device; the second piston is responsible for dividing the internal cavity of the device into two mutually sealed cavities, and the second electromagnetic actuator is extended or shortened as needed to push or pull the second piston; the liquid injection valve is used for filling liquid, and is opened during filling, and the working medium is filled in by the liquid injection valve; the vent hole is located on the side of the second shell radially away from the rotating shaft along the rotor, and does not affect the air tightness of the sealed cavity formed by the second piston and the second shell on the side of the rotor radially close to the rotating shaft.

5. The pressure control system for the pipeline internal cooling rotor evaporative cooling experimental platform according to claim 1 is characterized in that: Even when the second electromagnetic actuator reaches the maximum stroke, the position of the second piston in the liquid quantity control device will not exceed the injection valve, so that the liquid injected by the injection valve is always pushed into the liquid quantity control tube by the second piston.

6. The pressure control system for the pipeline-cooled rotor evaporative cooling experimental platform according to claim 1 is characterized in that: The liquid volume control device adopts a hard shell, or uses a liquid bag or an air bag, and contracts and expands through an extrusion device.

7. The pressure control system for the pipeline internal cooling rotor evaporative cooling experimental platform according to claim 1 is characterized in that: The liquid volume control device and the pressure control device change the volume by using an electromagnetic actuator to push a piston or by using a hydraulic method to drive a piston.

8. A pressure control method for a pipeline-cooled rotor evaporative cooling experimental platform, characterized in that: include: During the filling process, the pipeline-cooled rotor evaporative cooling experimental platform is in a static and unheated state, the lower solenoid valve connected to the liquid quantity control tube is closed, the second piston inside the liquid quantity control device is in the maximum stroke position that the second electromagnetic actuator can reach along the radial direction of the rotor away from the rotating shaft, the first piston inside the pressure control device is in the maximum stroke position that the first electromagnetic actuator can reach along the radial direction of the rotor away from the rotating shaft, the injection valve is opened to fill the interior of the liquid quantity control device with the working medium, and then the injection valve is reclosed, the upper solenoid valve connected to the pressure control tube is opened, the first micro solenoid valve and the second micro solenoid valve in the pressure control device are opened, and then the lower solenoid valve connected to the liquid quantity control tube is opened, and the second electromagnetic actuator inside the liquid quantity control device pushes the second piston to the bottom in the direction of the rotor radially close to the rotating shaft, and all the working medium is injected into the circulation pipeline of the pipeline-cooled rotor evaporative cooling experimental platform through the liquid quantity control tube; After the filling is completed, the lower solenoid valve connected to the liquid volume control tube is closed, then the upper solenoid valve connected to the pressure control tube is closed, and finally the first micro solenoid valve and the second micro solenoid valve in the pressure control device are closed.

9. The pressure control method for the pipeline internal cooling rotor evaporative cooling experimental platform according to claim 8 is characterized in that: include: During the preheating exhaust process, the in-pipe cooled rotor evaporative cooling experimental platform is first placed in a stable rotation state, and then the wall of the cooling pipe is heated. When the pressure at the outlet of the cooling pipe reaches stability, the solenoid valve on the pressure regulating pipe is opened, and then the first micro solenoid valve and the second micro solenoid valve on the pressure regulating device are opened to allow the mixed gas of air and gaseous working fluid to flow out of the circulation pipeline through the pressure regulating device, and then the solenoid valve connected to the pressure regulating pipe is closed, followed by the first micro solenoid valve of the pressure regulating device, and finally the second micro solenoid valve is closed to restore the pipeline to a sealed state.

10. The pressure control method for the pipeline internal cooling rotor evaporative cooling experimental platform according to claim 9 is characterized in that: include: During the experiment, the temperature and pressure in the upper pipe joint at the outlet of the cooling pipe are monitored by the first pressure sensor and the temperature sensor. If, under a stable state, the temperature at the outlet of the cooling pipe is lower than the boiling point of the working fluid corresponding to the pressure here, the pressure inside the circulation loop is reduced by the pressure control device according to the experimental needs, so that the working fluid can more easily reach boiling, and it is recorded as a new experimental working condition; at the end of the experiment, the pipeline-cooled rotor evaporative cooling experimental platform is maintained to rotate, the heating of the cooling pipe is stopped, the lower solenoid valve on the liquid quantity control pipe is opened first, and the second electromagnetic actuator in the liquid quantity control device drives the second piston to move along the radial direction of the rotor away from the rotating shaft. The working fluid will flow back into the liquid quantity control device under the action of centrifugal acceleration and the negative pressure in the liquid quantity control device, and then the upper solenoid valve on the pressure control pipe is opened, and then the first micro solenoid valve and the second micro solenoid valve on the pressure control device are opened to allow air to flow into the circulation pipeline, which will cause the residual working fluid to further flow into the liquid quantity control device, and finally the lower solenoid valve on the liquid quantity control pipe is closed to complete the working fluid recovery.

Images