Efficient phase change energy storage system for nuclear magnetic resonance equipment
By introducing an efficient phase change energy storage system into the nuclear magnetic resonance equipment, the cooling capacity is stored using solid-liquid phase change materials to provide emergency cooling water for the helium compressor, solving the magnet overflow problem caused by air-cooled chiller unit failure, and improving the system's refrigeration efficiency and safety.
Patent Information
- Application Number
- CN202422302917.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-20
AI Technical Summary
Among the existing nuclear magnetic resonance equipment, when the air-cooled chiller unit fails, it is not easy to be discovered at night, resulting in the cooling water supply of the helium compressor and causing magnet overflow accidents.
Design an efficient phase change energy storage system including air-cooled chiller units, helium compressors, filters, emergency valves, phase change energy storage devices, etc., and use solid-liquid phase change materials to store the cooling capacity, provide emergency cooling water, and avoid magnet overshoot.
It realizes that when the air-cooled chiller unit fails, it continuously provides cooling water for the helium compressor to avoid magnet overshooting, and improves refrigeration efficiency and safety.
Smart Images
Figure CN223153805U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of compression machines, devices or systems using air or other low-boiling-point gases as refrigerants, and particularly to an efficient phase-change energy storage system for nuclear magnetic resonance equipment. Background Technique
[0002] The magnet inside the nuclear magnetic resonance equipment is a superconducting magnet, which requires liquid helium to maintain low temperature. When a part of the liquid helium inside the magnet warms up and turns into gas, a section or part of the magnet will lose the superconducting phenomenon and generate resistance. A large amount of current flowing through the coil passes through this section of resistance and generates a large amount of heat to heat the nearby coil, thus triggering a chain reaction and ultimately causing all the main coils to lose the superconducting state and converting the current into heat to heat the liquid helium. A large amount of liquid helium volatilizes, and the helium gas generated by volatilization is discharged to the outside through the quench pipe. The volume of liquid helium expands about 700 times when it volatilizes into helium gas. Therefore, it is necessary to immediately discharge the helium gas generated by volatilization to the outside through the quench pipe, otherwise it will cause a malignant event such as personal injury. The helium compressor is a key component for maintaining the low temperature of liquid helium. The helium compressor needs to run continuously for 365 days × 24 hours, so it is necessary to supply cooling water at a certain temperature at all times. When the chiller that provides cooling water for the helium compressor fails, an accident of magnet quench will occur.
[0003] The current cooling water system of the helium compressor of the nuclear magnetic resonance equipment has the following problems: when the air-cooled chiller fails, especially when it fails at night, it is not easy to be discovered. At this time, the air-cooled chiller cannot provide cooling water for the helium compressor, and it fails to switch to the emergency cooling water in time, resulting in the interruption of the cooling water supply of the helium compressor, and thus an accident of magnet quench occurs. Content of the Utility Model
[0004] In order to overcome the defects of the prior art and provide a refrigeration auxiliary device with high refrigeration efficiency, high energy storage density, safety and reliability, the utility model discloses an efficient phase-change energy storage system for nuclear magnetic resonance equipment.
[0005] The utility model achieves the invention purpose through the following technical solutions:
[0006] An efficient phase-change energy storage system for nuclear magnetic resonance equipment, including an air-cooled chiller and a helium compressor, is characterized in that: it further includes a filter, a water supply pipe, a water return pipe, an emergency valve, an emergency switching valve, a bypass valve, an emergency water inlet pipe, an emergency drain pipe, a phase-change energy storage device, a phase-change energy storage device water inlet pipe, a phase-change energy storage device water outlet pipe and a bypass water pipe.
[0007] The water outlet of the helium compressor is connected to the water inlet of the air-cooled chiller through a water return pipe in series with an emergency switching valve and a filter in sequence.
[0008] The outlet of the air-cooled chiller is connected to the inlet of the phase change energy storage device through the inlet pipe of the phase change energy storage device in series with a circulating water pump.
[0009] The outlet of the phase change energy storage device is connected to the inlet of the outlet pipe of the phase change energy storage device. The outlet of the outlet pipe of the phase change energy storage device is connected to the inlet of the helium compressor through a water supply pipe in series with an emergency switching valve.
[0010] The water supply pipe is also connected to the outlet of the emergency water inlet pipe and the inlet of the bypass water pipe. The outlets of the emergency water inlet pipe and the bypass water pipe are both connected to the water supply pipe between the helium compressor and the emergency switching valve. An emergency valve is connected in series on the emergency water inlet pipe.
[0011] The return pipe is also connected to the outlet of the bypass water pipe and the inlet of the emergency drain pipe. The outlets of the bypass water pipe and the emergency drain pipe are both connected to the return pipe between the helium compressor and the emergency switching valve. An emergency valve is connected in series on the emergency drain pipe.
[0012] A bypass valve is connected in series on the bypass water pipe.
[0013] For the high-efficiency phase change energy storage system for nuclear magnetic resonance equipment, it is characterized in that: the filter selects a Y-type filter.
[0014] The functions of some components in the present utility model are as follows:
[0015] Air-cooled chiller: used to cool and lower the temperature of the cooling water.
[0016] Circulating water pump: used to pressurize the cooling water to make it circulate.
[0017] Helium compressor: a key component of the nuclear magnetic resonance equipment, which needs to be cooled by cooling water.
[0018] Filter: selects a Y-type filter, used to filter particulate matter and fine particles to protect the normal operation of equipment such as chillers.
[0019] Emergency valve, emergency water inlet pipe, emergency drain pipe: when the air-cooled chiller fails and cannot operate, it is used to provide emergency cooling water for the helium compressor to avoid magnet quench.
[0020] When the present utility model is used, it is implemented according to the following steps:
[0021] Normal operation: The emergency switching valves on the water supply pipe and the water return pipe are both open, the emergency valves on the emergency water inlet pipe and the emergency drain pipe, and the bypass valve on the bypass water pipe are all closed. Cooling water flows into the helium compressor. After cooling the helium compressor, the heated cooling water flows out of the helium compressor and is filtered by the filter on the water return pipe and then flows into the air-cooled chiller. The air-cooled chiller cools down the cooling water. Under the pressure of the circulating water pump, the cooled cooling water flows through the phase change energy storage device and then returns to the helium compressor to continuously cool the helium compressor. When the cooling water flows through the phase change energy storage device, the phase change energy storage device stores part of the cold energy of the cooling water.
[0022] Cold storage and cooling down: When the air-cooled chiller fails and cannot refrigerate normally, at this time, the phase change energy storage device releases the stored cold energy to cool down the cooling water.
[0023] Emergency refrigeration: If the air-cooled chiller eliminates the fault and resumes normal refrigeration before the cold energy stored in the phase change energy storage device is released completely, it will continue to operate in the normal operation mode; if the cold energy stored in the phase change energy storage device is about to be released completely but the air-cooled chiller still has not eliminated the fault, at this time, close the emergency switching valves on the water supply pipe and the water return pipe, and open the emergency valves on the emergency water inlet pipe and the emergency drain pipe, and the bypass valve on the bypass water pipe, and implement emergency refrigeration for the helium compressor by inputting emergency cooling water to avoid the magnet from quenching.
[0024] After the air-cooled chiller eliminates the fault and resumes normal refrigeration, open the emergency switching valves on the water supply pipe and the water return pipe, and close the emergency valves on the emergency water inlet pipe and the emergency drain pipe, and the bypass valve on the bypass water pipe, and resume normal mode operation. At the same time, the phase change energy storage device starts to store cold energy again.
[0025] The utility model adopts solid-liquid phase change energy storage based on solid-liquid phase change materials. The phase change latent heat is also called latent heat energy storage, which mainly utilizes the large amount of latent heat released or absorbed by the phase change materials during the phase change of the physical state, and has the advantages of high heat storage density (up to 5-10 times that of sensible heat energy storage), stable heat storage / release temperature, and easy control.
[0026] The water supply temperature of the cooling water of the helium compressor of the nuclear magnetic resonance equipment is usually about 12°C - 18°C. The phase change materials in the phase change energy storage device undergo phase change at this water supply temperature to achieve cold energy storage. The cold energy storage process does not affect the supply of cooling water for the nuclear magnetic resonance equipment.
[0027] Compared with the ice storage system, the phase change energy storage system can store cold energy at a water supply temperature of 12 - 18°C, and the refrigeration energy efficiency of the chiller is high. Ice storage requires a water supply temperature below -5°C to store cold energy, and the refrigeration energy efficiency of the chiller is low.
[0028] The energy storage density of the phase change materials is usually relatively high, and a large amount of cold energy can be stored in a small volume.
[0029] During the phase change process, the phase change material has a relatively stable temperature, and the temperature change is relatively gentle during the charging and discharging processes, which makes the charging and discharging efficiency of the system relatively high.
[0030] When the air-cooled chiller fails, especially at night, even if no one notices the failure, the phase change energy storage device can continue to provide cooling water for the helium compressor until the failure is eliminated, avoiding the interruption of the cooling water supply for the helium compressor and the accident of magnet quench.
[0031] The utility model has the following beneficial effects: high refrigeration efficiency, high energy storage density, safe and reliable. Description of the Drawings
[0032] Figure 1 It is a schematic structural diagram of the utility model. Detailed Embodiments
[0033] The following further illustrates the utility model through specific embodiments.
[0034] Embodiment 1
[0035] An efficient phase change energy storage system for nuclear magnetic resonance equipment, including an air-cooled chiller 1 and a helium compressor 3, is characterized in that: it further includes a filter 4, a water supply pipe 5, a water return pipe 6, an emergency valve 7, an emergency switching valve 8, a bypass valve 9, an emergency water inlet pipe 10, an emergency drain pipe 11, a phase change energy storage device 12, a phase change energy storage device water inlet pipe 13, a phase change energy storage device water outlet pipe 14 and a bypass water pipe 15.
[0036] The water outlet of the helium compressor 3 is connected to the water inlet of the air-cooled chiller 1 through the water return pipe 6 in which the emergency switching valve 8 and the filter 4 are connected in series in sequence.
[0037] The water outlet of the air-cooled chiller 1 is connected to the water inlet of the phase change energy storage device 12 through the phase change energy storage device water inlet pipe 13 in which a circulating water pump 2 is connected in series.
[0038] The water outlet of the phase change energy storage device 12 is connected to the water inlet of the phase change energy storage device water outlet pipe 14, and the water outlet of the phase change energy storage device water outlet pipe 14 is connected to the water inlet of the helium compressor 3 through the water supply pipe 5 in which the emergency switching valve 8 is connected in series.
[0039] The water supply pipe 5 is also connected to the water outlet of the emergency water inlet pipe 10 and the water inlet of the bypass water pipe 15. The water outlets of the emergency water inlet pipe 10 and the bypass water pipe 15 are both connected to the water supply pipe 5 between the helium compressor 3 and the emergency switching valve 8. The emergency valve 7 is connected in series on the emergency water inlet pipe 10.
[0040] The return water pipe 6 is also connected to the outlet of the bypass water pipe 15 and the inlet of the emergency drain pipe 11. The outlet of the bypass water pipe 15 and the inlet of the emergency drain pipe 11 are both connected to the return water pipe 6 between the helium compressor 3 and the emergency switching valve 8. An emergency valve 7 is connected in series on the emergency drain pipe 11.
[0041] A bypass valve 9 is connected in series on the bypass water pipe 15.
[0042] In this embodiment: The filter 4 is a Y-type filter.
[0043] The functions of some components in this embodiment are as follows:
[0044] The air-cooled chiller 1: used to cool down the cooling water.
[0045] The circulating water pump 2: used to pressurize the cooling water to make it circulate.
[0046] The helium compressor 3: is a key component of the nuclear magnetic resonance equipment and requires cooling water for cooling.
[0047] The filter 4: a Y-type filter is selected, used to filter particulate matter and fine particles to protect equipment such as chillers from normal operation.
[0048] The emergency valve 7, the emergency inlet pipe 10, and the emergency drain pipe 11: when the air-cooled chiller 1 fails and cannot operate, used to provide emergency cooling water for the helium compressor 3 to avoid magnet quench.
[0049] When this embodiment is used, it is implemented according to the following steps:
[0050] Normal operation: The emergency switching valves 8 on the water supply pipe 5 and the return water pipe 6 are both opened, the emergency valves 7 on the emergency inlet pipe 10 and the emergency drain pipe 11 and the bypass valve 9 on the bypass water pipe 15 are both closed. The cooling water flows into the helium compressor 3. After cooling the helium compressor 3, the heated cooling water flows out of the helium compressor 3 and is filtered by the filter 4 on the return water pipe 6 and then flows into the air-cooled chiller 1. The air-cooled chiller 1 cools down the cooling water. Under the pressure of the circulating water pump 2, the cooled cooling water flows through the phase change energy storage device 12 and then returns to the helium compressor 3 to continuously cool the helium compressor 3. When the cooling water flows through the phase change energy storage device 12, the phase change energy storage device 12 stores part of the cold energy of the cooling water.
[0051] Cold energy storage and cooling: When the air-cooled chiller 1 fails and cannot cool normally, at this time, the phase change energy storage device 12 releases the stored cold energy to cool the cooling water.
[0052] Emergency refrigeration: If the air-cooled chiller 1 resumes normal refrigeration after troubleshooting before the cold stored in the phase change energy storage device 12 is released, it will continue to operate in the normal operation mode; if the cold stored in the phase change energy storage device 12 is about to be released but the air-cooled chiller 1 has not been troubleshot yet, at this time, close the emergency switching valves 8 on the water supply pipe 5 and the water return pipe 6, and open the emergency valves 7 on the emergency water inlet pipe 10 and the emergency drain pipe 11, and the bypass valve 9 on the bypass water pipe 15, and implement emergency refrigeration for the helium compressor 3 by inputting emergency cooling water to avoid magnet quench. Figure 1 In the figure, point a is the input point of the emergency cooling water, and point b is the output point of the emergency cooling water.
[0053] After the air-cooled chiller 1 is troubleshot and resumes normal refrigeration, open the emergency switching valves 8 on the water supply pipe 5 and the water return pipe 6, and close the emergency valves 7 on the emergency water inlet pipe 10 and the emergency drain pipe 11, and the bypass valve 9 on the bypass water pipe 15, and resume normal mode operation. At the same time, the phase change energy storage device 12 starts to store cold again.
Claims
1. An efficient phase change energy storage system for a nuclear magnetic resonance device, comprising an air-cooled chiller (1) and a helium compressor (3), characterized in that: It also includes a filter (4), a water supply pipe (5), a water return pipe (6), an emergency valve (7), an emergency switching valve (8), a bypass valve (9), an emergency water inlet pipe (10), an emergency drain pipe (11), a phase change energy storage device (12), a phase change energy storage device water inlet pipe (13), a phase change energy storage device water outlet pipe (14), and a bypass water pipe (15). The water outlet of the helium compressor (3) is connected to the water inlet of the air-cooled chiller (1) through the water return pipe (6) in which the emergency switching valve (8) and the filter (4) are connected in series in sequence. The water outlet of the air-cooled chiller (1) is connected to the water inlet of the phase change energy storage device (12) through the phase change energy storage device water inlet pipe (13) in which a circulating water pump (2) is connected in series. The water outlet of the phase change energy storage device (12) is connected to the water inlet of the phase change energy storage device water outlet pipe (14). The water outlet of the phase change energy storage device water outlet pipe (14) is connected to the water inlet of the helium compressor (3) through the water supply pipe (5) in which the emergency switching valve (8) is connected in series. The water supply pipe (5) is also connected to the water outlet of the emergency water inlet pipe (10) and the water inlet of the bypass water pipe (15). The water outlets of the emergency water inlet pipe (10) and the bypass water pipe (15) are both connected to the water supply pipe (5) between the helium compressor (3) and the emergency switching valve (8). The emergency valve (7) is connected in series on the emergency water inlet pipe (10). The water return pipe (6) is also connected to the water outlet of the bypass water pipe (15) and the water inlet of the emergency drain pipe (11). The water outlets of the bypass water pipe (15) and the emergency drain pipe (11) are both connected to the water return pipe (6) between the helium compressor (3) and the emergency switching valve (8). The emergency valve (7) is connected in series on the emergency drain pipe (11). The bypass valve (9) is connected in series on the bypass water pipe (15).
2. The high-efficiency phase-change energy storage system for nuclear magnetic resonance equipment according to claim 1, characterized in that: The filter (4) is a Y-type filter.