Cooling system for on-board helium compressor

Abstract

The application discloses a cooling system of a vehicle-mounted helium compressor, which comprises a cold accumulator, a helium compressor cooling water circulating water pump, a loose coupling conveying pipeline, a mixed conveying pump, a first stop valve, a water-ice mixer, a second stop valve, a third stop valve, a water chiller water tank, a water chiller compressor, a water chiller condenser and a fan, a water chiller expansion valve, an ice maker compressor, an ice storage, an ice maker expansion valve, an ice maker condenser and a fan, a fourth stop valve and a fifth stop valve. The helium compressor outlet is connected with a water circulating water inlet of the cold accumulator; the helium compressor inlet is connected with an outlet of the helium compressor cooling water circulating water pump; a helium compressor cooling water circulating water pump inlet is connected with a water circulating water outlet of the cold accumulator; one end of the fifth stop valve is connected with a filling opening of the cold accumulator; and the other end of the fifth stop valve is connected with the loose coupling conveying pipeline, the mixed conveying pump, the first stop valve, the water-ice mixer, the second stop valve, the third stop valve, a ground water chiller unit and a ground ice maker unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cooling technology, in particular to a cooling system of a vehicle-mounted helium compressor. BACKGROUND

[0002] The low-temperature superconducting maglev train uses the strong magnetic field generated by the low-temperature superconducting magnet to support and drive the train. In order to maintain the superconducting performance of the magnet, a vehicle-mounted helium compressor needs to be equipped. During the normal refrigeration process of the helium compressor, the hot helium circulates to the compressor to increase the pressure, and the mechanical movement of the compressor also generates heat. If these heat is not removed in time, the compressor will overheat, the compressor cannot refrigerate liquid helium normally, and even the magnet will lose superconducting performance. Therefore, it is necessary to reasonably design the cooling system of the helium compressor to make the helium compressor work in a suitable temperature range.

[0003] At present, the helium compressor on the market generally relies on a water chiller to provide cooling water for the helium compressor. The compressor of the water chiller compresses the gaseous refrigerant into a high-temperature and high-pressure liquid, which is delivered to an outdoor condenser, cooled by air to become a high-temperature and high-pressure liquid refrigerant, and then flows through an expansion valve to reduce pressure, and then enters a heat exchanger to absorb the heat of the helium compressor water circulation. The refrigerant vaporizes, and finally returns to the compressor to continue the cycle refrigeration.

[0004] The traditional water chiller cannot be separated from the air medium. During the refrigeration process of the water chiller, when the refrigerant passes through the condenser, it needs to exchange heat with the surrounding air to fully condense the refrigerant into a liquid, so that the refrigerant can be throttled to reduce the temperature and produce cold energy when it reaches the expansion valve.

[0005] If the traditional water chiller is used to provide cooling water for the helium compressor on the maglev train, in order to ensure the air inlet amount and the heat dissipation effect of the condenser, a special air inlet and outlet passage needs to be arranged on the train, but such an air inlet and outlet passage will increase the running resistance of the train and is not suitable for a vacuum environment without air medium. SUMMARY

[0006] The present application provides a cooling system of a vehicle-mounted helium compressor, which can solve the technical problems in the prior art.

[0007] The present application provides a cooling system of a vehicle-mounted helium compressor, which comprises a cold accumulator, a helium compressor cooling water circulation pump, a loose joint delivery pipeline, a mixing delivery pump, a first stop valve, an ice-water mixer, a second stop valve, a third stop valve, a water tank of a water chiller, a compressor of the water chiller, a condenser and a fan of the water chiller, an expansion valve of the water chiller, a compressor of an ice maker, an ice storage, an expansion valve of the ice maker, a condenser and a fan of the ice maker, a fourth stop valve and a fifth stop valve.

[0008] The helium compressor outlet is connected with a water circulation inlet of the cold accumulator, the helium compressor inlet is connected with an outlet of a helium compressor cooling water circulation water pump, an inlet of the helium compressor cooling water circulation water pump is connected with a water circulation outlet of the cold accumulator, one end of the fifth stop valve is connected with a filling port of the cold accumulator, and the other end is connected with the loose joint conveying pipeline, the mixing conveying pump, the first stop valve and the ice water mixer in sequence, the ice water mixer is further connected with the second stop valve and the third stop valve, the second stop valve is connected with a water tank of a water chiller, the water tank of the water chiller is further connected with a water chiller compressor and a water chiller expansion valve, a water chiller condenser and a fan are arranged between the water chiller compressor and the water chiller expansion valve, the third stop valve is connected with an ice storage library, the ice storage library is further connected with an ice maker compressor and an ice maker expansion valve, an ice maker condenser and a fan are arranged between the ice maker compressor and the ice maker expansion valve, and the fourth stop valve is connected with a water return port of the cold accumulator.

[0009] Preferably, the system further comprises a filtering unit arranged between the helium compressor and the cold accumulator.

[0010] Preferably, the filtering unit is a filter screen.

[0011] Preferably, the system further comprises a temperature detection unit arranged at the helium compressor outlet, for detecting the temperature of the helium compressor outlet.

[0012] Preferably, the temperature detection unit is a thermometer.

[0013] Preferably, the system further comprises a flow detection unit arranged between the second stop valve and the water tank of the water chiller, for detecting the flow of cooling water.

[0014] Preferably, the flow detection unit is a flow meter.

[0015] Preferably, the ice water mixer is provided with a stirrer for stirring and mixing the ice and cooling water entering the ice water mixer.

[0016] Through the above technical solution, a certain proportion of ice water mixture can be loaded in the vehicle-mounted cold accumulator to provide cold energy for the helium compressor, so that the helium compressor can be maintained in a normal working temperature range, and the problem that the existing scheme cannot provide cooling water for the helium compressor is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0018] Figure 1 A cooling system for a vehicle-mounted helium compressor is shown. DETAILED DESCRIPTION

[0019] It should be noted that the embodiments and features of the application herein disclosed can be used in any combination, without mutual limitation, unless the context implies otherwise. The following describes at least one exemplary embodiment with reference to the accompanying drawings, in which:

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the example embodiments according to the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0021] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless specifically so stated. It should be understood that the size, shapes, and proportions of the parts shown in the drawings are not necessarily to scale. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the description of the application. In all examples shown and discussed herein, any specific value should be interpreted as merely an example, and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0022] Figure 1A cooling system for a vehicle-mounted helium compressor is shown.

[0023] like Figure 1 As shown, an embodiment of the present invention provides a cooling system for a vehicle-mounted helium compressor, wherein the system includes a cold storage device 2, a helium compressor cooling water circulation pump 3, a flexible delivery pipeline 4, a mixed delivery pump 5, a first stop valve 6, an ice-water mixer 7, a second stop valve 8, a third stop valve 9, a chiller water tank 10, a chiller compressor 11, a chiller condenser and a fan 12, a chiller expansion valve 13, an ice maker compressor 14, an ice storage tank 15, an ice maker expansion valve 16, an ice maker condenser and a fan 17, a fourth stop valve 18, and a fifth stop valve 19, wherein:

[0024] The outlet of the helium compressor 1 is connected to the water circulation inlet c of the cold accumulator 2, the inlet of the helium compressor 1 is connected to the outlet of the helium compressor cooling water circulation pump 3, the inlet of the helium compressor cooling water circulation pump 3 is connected to the water circulation outlet d of the cold accumulator 2, one end of the fifth stop valve 19 is connected to the filling port b of the cold accumulator 2, and the other end is connected to the movable delivery pipeline 4, the mixed delivery pump 5, the first stop valve 6 and the ice-water mixer 7 in sequence, the ice-water mixer 7 is also connected to the second stop valve 8 and the third stop valve 9, the second stop valve 8 is connected to the The chiller water tank 10 is connected, and the chiller water tank 10 is also connected to the chiller compressor 11 and the chiller expansion valve 13. The chiller condenser and the fan 12 are arranged between the chiller compressor 11 and the chiller expansion valve 13. The third stop valve 9 is connected to the ice storage 15, and the ice storage 15 is also connected to the ice maker compressor 14 and the ice maker expansion valve 16. The ice maker condenser and the fan 17 are arranged between the ice maker compressor 14 and the ice maker expansion valve 16. The fourth stop valve 18 is connected to the return water port a of the cold storage device 2.

[0025] The chiller water tank 10, chiller compressor 11, chiller condenser and fan 12, and chiller expansion valve 13 constitute the ground-level chiller. The icemaker compressor 14, ice storage 15, icemaker expansion valve 16, and icemaker condenser and fan 17 constitute the ground-level icemaker. The chiller produces cooling water that meets the required temperature and quality and is stored in the chiller's water tank. The chiller water tank has a weighing function and automatic start-stop control, capable of delivering a fixed amount of water at a time, and can automatically start and stop delivery based on water demand. Similarly, the icemaker produces ice that meets quality requirements and stores it in the ice storage. The ice storage can also have automatic weighing and automatic start-stop control functions, capable of delivering a fixed amount of ice at a time, and can automatically start and stop delivery based on water demand.

[0026] By the technical scheme, the ice-water mixture with a certain proportion can be loaded in the vehicle-mounted cold accumulator to provide cold energy for the helium compressor, and the helium compressor can be maintained in a normal working temperature range, thereby solving the problem that the existing scheme cannot provide cooling water for the helium compressor.

[0027] The cooling system of the vehicle-mounted helium compressor can be used for cooling the vehicle-mounted helium compressor of a low-temperature superconducting maglev train, but the present application is not limited thereto, and other medium or large-sized heat dissipation power heat dissipation devices, other fixed heat dissipation devices or heat dissipation devices that can be moved at any time can also use the cooling system.

[0028] The cooling system of the vehicle-mounted helium compressor can also be used for cooling devices in a vacuum or low-vacuum environment, but the present application is not limited thereto, and the cooling system is also applicable to cooling of devices under normal pressure and high pressure.

[0029] The cooling system of the vehicle-mounted helium compressor can also be used for cooling devices in a normal-temperature environment, but the present application is not limited thereto, and the cooling system is also applicable to cooling of devices in a high-temperature environment.

[0030] The ice-water mixture has a certain flowability, and the cold water can directly enter the cooling water circulation of the helium compressor; the latent heat of the ice is relatively large, which can minimize the volume of the cold accumulator, and the ice can release cold energy after melting into water, and can directly participate in the cooling water circulation of the helium compressor, thereby further improving the heat exchange efficiency.

[0031] According to an embodiment of the present application, the system further comprises a filtering unit arranged between the helium compressor 1 and the cold accumulator 2.

[0032] By arranging the filtering unit, it can be ensured that the ice does not block the circulation pipeline of the helium compressor, and the risk of ice blocking can be avoided.

[0033] According to an embodiment of the present application, the filtering unit is a filter screen.

[0034] According to an embodiment of the present application, the system further comprises a temperature detection unit 20 arranged at the outlet of the helium compressor 1 and used for detecting the temperature of the outlet of the helium compressor 1.

[0035] By arranging the temperature detection unit, the outlet water temperature can be monitored: when the water temperature reaches the maximum water temperature threshold of the helium compressor, the train can be controlled to stop at a station in advance, the hot water in the cold accumulator can be pumped out, and the ice-water mixture can be refilled, so as to ensure the cooling efficiency.

[0036] According to an embodiment of the present application, the temperature detection unit is a thermometer.

[0037] According to an embodiment of the present application, the system further comprises a flow detection unit 21 arranged between the second stop valve 8 and the water tank 10 of the chiller, for detecting the flow of cooling water.

[0038] By arranging the flow detection unit, the flow of cooling water can be monitored to ensure that the ice-water ratio can be delivered to the ice-water mixer according to the pre-set value.

[0039] According to an embodiment of the present application, the flow detection unit 21 is a flow meter.

[0040] According to an embodiment of the present application, the ice-water mixer 7 is provided with a stirrer for stirring and mixing the ice and cooling water entering the ice-water mixer 7.

[0041] For example, water is delivered to the mixer through a pipeline (water pipe), and ice is delivered to the mixer through a screw conveying device, and the delivered ice and water are fully mixed in the mixer for standby; the stirrer in the mixer continuously stirs to fully mix the ice and water, and prevents large-area ice formation. During the delivery process, the quality of the delivered cooling water and ice can be monitored to ensure that the ice-water ratio can be delivered to the mixer according to the pre-set value.

[0042] In the present application, the required stored cold energy can be calculated according to the required running time of the superconducting train in a low vacuum environment, the thermal load and working time of the helium compressor on the superconducting magnet, and the maximum temperature limit of the water outlet of the helium compressor, including the ice-water ratio, the temperature and quality of the cooling water, and the quality of the ice.

[0043] The working principle of the cooling system of the on-board helium compressor described in the present application will be described below taking the helium compressor of a low-temperature superconducting maglev train running in a low vacuum environment as an example.

[0044] In the present application, the water circulation inlet c and the water circulation outlet d of the cold accumulator 2 serve as the water pipe interface for cooling water circulation; the filling port b of the cold accumulator 2 is used for filling the ice-water mixture (for example, before the train enters the low vacuum environment, the mixed ice-water mixture enters the on-board cold accumulator 2 through the filling port b), and the water return port a of the cold accumulator 2 is used for drawing out the hot water after the cold energy of the cold accumulator 2 is released, to make room for the ice-water mixture. In addition, the cold accumulator 2 has good heat preservation performance to prevent cold loss.

[0045] The helium compressor cooling water circulating pump 3 on the circulating loop of the helium compressor 1 can provide cooling water for the helium compressor 1; the hot water after passing through the helium compressor 1 is circulated to the cold accumulator 2, and the ice in the cold accumulator 2 continuously releases cold energy, which is converted into cold water, thereby maintaining the working temperature range of the helium compressor 1.

[0046] Specifically, the cooling process of the cooling system of the low-temperature superconducting maglev vehicle-mounted helium compressor in a low-vacuum environment is as follows:

[0047] Step 1: Start the cold water unit to prepare cooling water, and store the cooling water in the cold water unit water tank 10 for standby (the cold water unit compressor 11, the cold water unit condenser and fan 12, and the cold water unit expansion valve 13 cooperate with each other to realize cooling water preparation and storage in the cold water unit water tank 10); start the ice maker unit to prepare ice, and store the ice in the ice storage 15 for standby (the ice maker compressor 14, the ice maker expansion valve 16, and the ice maker condenser and fan 17 cooperate with each other to realize ice making and storage in the ice storage 15).

[0048] Step 2: In the automatic control program, the parameters such as the mass of cooling water required to be delivered at one time, the mass of ice required to be delivered at one time, the ice and water delivery times, and the ice-water mixture ratio are set in advance.

[0049] Step 3: Open the second stop valve 8 and the third stop valve 9 at the same time to deliver the cooling water and ice prepared in step 1 to the ice-water mixer 7; the ice and water delivery times are automatically completed according to the pre-set ice-water ratio. At the same time, the stirrer in the ice-water mixer 7 is started to rotate continuously.

[0050] Step 4: Before the train enters the low-vacuum environment, stop at the platform, connect the two ends of the detachable delivery pipe 4 with the mixing delivery pump 5 and the filling port b of the cold accumulator 2 respectively; open the first stop valve 6 and close the fourth stop valve 18, and prepare to fill the ice-water mixture into the filling port b.

[0051] Step 5: Open the fifth stop valve 19, start the mixing delivery pump 5, and fill the ice-water mixture into the cold accumulator 2.

[0052] Step 6: After filling is completed, stop the mixing delivery pump 5, close the fifth stop valve 19, and disconnect the detachable delivery pipe 4.

[0053] Step 7: Start the cooling water circulating system (circulating water pump 3) of the vehicle-mounted helium compressor 1, at this time the train can enter the low-vacuum environment and run, and the heat generated by the vehicle-mounted helium compressor 1 continuously consumes the cold energy in the cold accumulator.

[0054] Step 8: When the train runs in the low-vacuum environment for a certain time, or when the outlet water temperature of the helium compressor 1 reaches the maximum temperature threshold, the train stops in advance.

[0055] Step 9: Open the fourth stop valve 18, and draw out the hot water in the cold accumulator 2.

[0056] Step 10: After the hot water return is completed, close the fourth stop valve 18, and return to step 3, and the ice water mixture can be refilled.

[0057] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of contrary description, these orientation words do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0058] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0059] In addition, it should be noted that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0060] The above description is only preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A cooling system for a vehicle-mounted helium compressor, characterized in that: The system comprises a cold storage device (2), a helium compressor cooling water circulation pump (3), a flexible delivery pipeline (4), a mixing delivery pump (5), a first stop valve (6), an ice-water mixer (7), a second stop valve (8), a third stop valve (9), a chiller water tank (10), a chiller compressor (11), a chiller condenser and fan (12), a chiller expansion valve (13), an ice maker compressor (14), an ice storage tank (15), an ice maker expansion valve (16), an ice maker condenser and fan (17), a fourth stop valve (18) and a fifth stop valve (19), wherein: The outlet of the helium compressor (1) is connected to the water circulation inlet of the cold accumulator (2), the inlet of the helium compressor (1) is connected to the outlet of the helium compressor cooling water circulation pump (3), the inlet of the helium compressor cooling water circulation pump (3) is connected to the water circulation outlet of the cold accumulator (2), one end of the fifth stop valve (19) is connected to the filling port of the cold accumulator (2), and the other end is connected in sequence to the flexible delivery pipeline (4), the mixing delivery pump (5), the first stop valve (6) and the ice-water mixer (7), the ice-water mixer (7) is also connected to the second stop valve (8) and the third stop valve (9), the second stop valve (8) is connected to the cold accumulator (2), and the third stop valve (9) is connected to the cold accumulator (2). The water tank (10) is connected to the water machine, the water tank (10) is also connected to the water machine compressor (11) and the water machine expansion valve (13), the water machine condenser and the fan (12) are arranged between the water machine compressor (11) and the water machine expansion valve (13), the third stop valve (9) is connected to the ice storage (15), the ice storage (15) is also connected to the ice machine compressor (14) and the ice machine expansion valve (16), the ice machine condenser and the fan (17) are arranged between the ice machine compressor (14) and the ice machine expansion valve (16), and the fourth stop valve (18) is connected to the return water port of the cold storage device (2); The system further comprises a filtering unit, which is arranged between the helium compressor (1) and the cold storage device (2); The system further comprises a temperature detection unit (20), which is arranged at the outlet of the helium compressor (1) and is used to detect the temperature of the outlet of the helium compressor (1).

2. The system according to claim 1, wherein: The filtering unit is a filter mesh.

3. The system according to claim 1, wherein: The temperature detection unit is a thermometer.

4. The system according to claim 3, characterized in that The system further comprises a flow detection unit (21), which is arranged between the second stop valve (8) and the chiller water tank (10) and is used to detect the cooling water flow.

5. The system according to claim 4, characterized in that The flow detection unit (21) is a flow meter.

6. The system according to any one of claims 1 to 5, characterized in that The ice-water mixer (7) is provided with a stirrer for stirring and mixing the ice and cooling water entering the ice-water mixer (7).

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