Composite cold source heat dissipation system suitable for low-vacuum pipeline

Abstract

The invention relates to the technical field of heat dissipation systems, and discloses a composite cold source heat dissipation system suitable for a low-vacuum pipeline, the composite cold source heat dissipation system comprises a vehicle-mounted equipment heat dissipation liquid cooling loop and a cold source loop, the vehicle-mounted equipment heat dissipation liquid cooling loop comprises a liquid storage tank, a first pump and a heat exchanger, and the cold source loop comprises a second pump, a cold storage tank, a boiling radiator, a first valve and a second valve. The first pump drives the heat dissipation medium in the liquid storage tank to flow to the to-be-cooled equipment to take out heat of the to-be-cooled equipment, and the heat dissipation medium after heat absorption flows to the cold source loop through the heat exchanger; when the boiling heat dissipation condition is met, the second pump drives the heat dissipation medium after heat absorption to flow to the boiling radiator through the first valve, and the heat dissipation medium after heat dissipation of the boiling radiator flows back to the liquid storage tank through the second valve and the heat exchanger; and when the boiling heat dissipation condition is not met, the second pump drives the heat dissipation medium absorbing heat to flow to the cold storage box through the first valve, and the heat dissipation medium absorbing heat through the cold storage box flows back to the liquid storage box through the second valve and the heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation systems, and particularly to a composite cold source heat dissipation system applicable to a low-vacuum pipeline. Background Art

[0002] A pipeline train is a new transportation system that uses a train as a carrier, utilizes superconducting magnetic levitation technology to achieve the train's separation from the ground and eliminate frictional resistance, and uses an internal near-vacuum pipeline environment to greatly reduce air resistance, thereby enabling the train to theoretically reach a speed of over 1000 km / h. The low-vacuum pipeline train can greatly shorten the time and space distance between cities, and at the same time has many advantages such as being unaffected by weather conditions, not being restricted by air traffic flow, and having seamless connection with the urban rail system.

[0003] The low-vacuum pipeline provides an ideal operating environment for the train, which is stable, enclosed, and has low resistance. However, since the low-vacuum pipeline isolates the internal environment of the train from the external atmospheric environment, it is difficult to directly export the heat of on-vehicle equipment, especially high-power equipment: (1) The air medium in the low-vacuum pipeline environment is greatly reduced, and the convective heat transfer capacity is significantly weakened; (2) A large amount of equipment heat dissipated into the low-vacuum pipeline will significantly affect the internal environment of the pipeline, causing great pressure on the control of the low-vacuum pipeline environment.

[0004] Most of the current on-vehicle heat dissipation systems and devices in the prior art are for normal pressure and open external environments and are not applicable to the low-vacuum pipeline environment. Summary of the Invention

[0005] The present invention provides a composite cold source heat dissipation system applicable to a low-vacuum pipeline, which can solve the technical problems in the prior art.

[0006] The present invention provides a composite cold source heat dissipation system applicable to a low-vacuum pipeline. The system includes an on-vehicle equipment heat dissipation liquid cooling loop and a cold source loop. The on-vehicle equipment heat dissipation liquid cooling loop includes a liquid storage tank, a first pump, and a heat exchanger. The cold source loop includes a second pump, a cold storage tank, a boiling radiator, a first valve, and a second valve.

[0007] The first pump drives the heat dissipation medium in the liquid storage tank to flow to the equipment to be cooled to take out the heat of the equipment to be cooled, and the heat-absorbed heat dissipation medium flows to the cold source loop through the heat exchanger.

[0008] When the pressure in the low-vacuum pipeline meets the conditions for boiling heat dissipation, the second pump drives the heat-absorbed heat dissipation medium to flow through the first valve to the boiling radiator, and the heat dissipation medium after being dissipated by the boiling radiator flows back to the liquid storage tank through the second valve and the heat exchanger.

[0009] When the pressure in the low-vacuum pipeline does not meet the conditions for boiling heat dissipation, the second pump drives the heat-absorbed heat dissipation medium to flow through the first valve to the cold storage tank, and the heat dissipation medium after being absorbed by the cold storage tank flows back to the liquid storage tank through the second valve and the heat exchanger.

[0010] Preferably, the system further includes a pressure sensor and a judging device. The pressure sensor is used to detect the pressure in the low-vacuum pipeline, and the judging device is used to judge whether the detected pressure meets the conditions for boiling heat dissipation.

[0011] Preferably, the heat dissipation medium in the liquid storage tank is water-ethylene glycol.

[0012] Preferably, the first valve and the second valve are three-way valves.

[0013] Preferably, the system further includes a third valve and a fourth valve. The third valve is arranged between the heat exchanger and the second valve, and the fourth valve is arranged between the heat exchanger and the second pump.

[0014] Preferably, the third valve and the fourth valve are two-way valves.

[0015] Preferably, the first pump and the second pump are power pumps.

[0016] Through the above technical solutions, the heat dissipation requirements of the low-vacuum pipeline train in different scenarios can be met, and the continuous and stable operation of on-vehicle high-power equipment can be realized. Description of the Drawings

[0017] The included drawings are used to provide a further understanding of the embodiments of the present invention. They form a part of the specification, are used to illustrate the embodiments of the present invention, and together with the written description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Shows a schematic diagram of a composite cold source heat dissipation system applicable to a low-vacuum pipeline according to an embodiment of the present invention;

[0019] Figures 2A - 2B Shows a schematic diagram of different heat dissipation modes of a composite cold source heat dissipation system applicable to a low-vacuum pipeline according to an embodiment of the present invention. Detailed Embodiments

[0020] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0023] Figure 1 A schematic diagram of a composite cold source heat dissipation system applicable to a low-vacuum pipeline is shown according to an embodiment of the present invention.

[0024] Among them, the present invention is applicable to the train cooling and heat dissipation in the full operating state of the low-vacuum pipeline environment.

[0025] As Figure 1 shown, an embodiment of the present invention provides a composite cold source heat dissipation system applicable to a low-vacuum pipeline. Among them, the system includes a liquid cooling loop for on-vehicle equipment heat dissipation and a cold source loop. The liquid cooling loop for on-vehicle equipment heat dissipation includes a liquid storage tank, a first pump, and a heat exchanger. The cold source loop includes a second pump, a cold storage tank, a boiling radiator, a first valve, and a second valve.

[0026] The first pump is used to drive the heat dissipation medium (cooling liquid) in the liquid storage tank to flow to the device to be cooled, taking out the heat of the device to be cooled. After absorbing heat, the heat dissipation medium flows through the heat exchanger to the cold source circuit;

[0027] When the pressure in the low-vacuum pipeline meets the conditions for boiling heat dissipation, the second pump is used to drive the heat dissipation medium after absorbing heat to flow through the first valve to the boiling radiator. After being dissipated by the boiling radiator, the heat dissipation medium flows back to the liquid storage tank through the second valve and the heat exchanger;

[0028] When the pressure in the low-vacuum pipeline does not meet the conditions for boiling heat dissipation, the second pump is used to drive the heat dissipation medium after absorbing heat to flow through the first valve to the cold storage tank. After absorbing heat in the cold storage tank, the heat dissipation medium flows back to the liquid storage tank through the second valve and the heat exchanger.

[0029] That is, the on-vehicle equipment heat dissipation liquid cooling circuit drives the cooling liquid to flow through the first pump, taking out the heat generated by the equipment, and converting the heat to the system cold source circuit through the heat exchanger; the system cold source circuit adopts a pump-driven two-phase circulation system for finally dissipating or absorbing the heat of the equipment.

[0030] Through the above technical solutions, the heat dissipation requirements of the low-vacuum pipeline train in different scenarios can be met, and the continuous and stable operation of on-vehicle high-power equipment can be realized.

[0031] Specifically, during the long-term operation stage in the low-vacuum pipeline, the characteristic that the boiling point of water decreases in the low-vacuum environment (the boiling point of water at 1 kPa is about 7 °C) can be utilized, and the continuous heat generated by the equipment can be dissipated by the continuous boiling of water in the low-vacuum environment. After water absorbs heat, it changes phase into water vapor and is discharged into the low-vacuum pipeline.

[0032] When the train enters / leaves the low-vacuum pipeline, it needs to pass through a connecting and transitional pipe section, and a low-vacuum environment is established / restored to the atmospheric environment in this pipe section. During the process, the environmental pressure will change continuously, affecting the performance and stability of boiling heat dissipation. At this time, the system can switch to absorbing the heat of the equipment through the cold storage device, without being affected by the external environment. At the same time, since the connecting and transitional time is relatively short compared to the running time, the volume and weight of the cold storage device are relatively small.

[0033] Based on this, the present invention can achieve long-term heat dissipation of on-vehicle high-power equipment in a low-vacuum environment, solve the heat dissipation problem of on-vehicle equipment with low vacuum, high power, and long-term operation; during the process of the train entering and leaving the low-vacuum pipeline, when pumping vacuum and restoring pressure to atmospheric pressure, the on-vehicle equipment can also dissipate heat stably without being affected by the change of external pressure; the optimization of the on-vehicle heat dissipation system in the low-vacuum environment is realized, and the heat dissipation performance of the system equipment per unit weight is improved.

[0034] According to an embodiment of the present invention, the system further includes a pressure sensor P and a judging device. The pressure sensor is used to detect the pressure in the low-vacuum pipeline, and the judging device is used to judge whether the detected pressure meets the conditions for boiling heat dissipation.

[0035] According to an embodiment of the present invention, the heat dissipation medium in the liquid storage tank is water-ethylene glycol.

[0036] According to an embodiment of the present invention, the first valve and the second valve are three-way valves.

[0037] According to an embodiment of the present invention, the system further includes a third valve and a fourth valve. The third valve is arranged between the heat exchanger and the second valve, and the fourth valve is arranged between the heat exchanger and the second pump.

[0038] Thus, it is possible to switch between connecting and disconnecting the in-vehicle equipment heat dissipation liquid cooling loop and the cold source loop.

[0039] According to an embodiment of the present invention, the third valve and the fourth valve are two-way valves.

[0040] According to an embodiment of the present invention, the first pump and the second pump are power pumps.

[0041] The composite cold source heat dissipation system applicable to low-vacuum pipelines according to the present invention will be described below with reference to examples.

[0042] The composite cold source heat dissipation system applicable to low-vacuum pipelines according to the present invention includes an in-vehicle equipment heat dissipation liquid cooling loop and a system cold source loop. In the in-vehicle equipment heat dissipation liquid cooling loop, the heat dissipation of the equipment is driven by a pump to make the working medium (such as water-ethylene glycol) flow, and the heat is exported through a heat exchanger. The system cold source loop contains two cold sources, namely a cold storage device and a boiling radiator. The heat exchange is realized by driving the working medium (refrigerant) to flow through a pump, and the switching between the boiling heat dissipation mode and the cold storage heat dissipation mode is realized through the linkage of valves. The switching timing and method are judged by a pressure sensor and a judging module.

[0043] That is, the equipment to be cooled is arranged in a separate heat dissipation liquid cooling loop. The heat dissipation of the equipment is carried out by driving the liquid (such as a water-ethylene glycol solution) in the liquid storage tank to flow through a pump, and is transferred to the other side of the system cold source loop through a heat exchanger for cooling.

[0044] Figure 2A is the boiling heat dissipation mode, Figure 2B is the cold storage heat dissipation mode.

[0045] Such as Figures 2A - 2BAs shown, when the liquid saturation temperature corresponding to the vacuum degree in the pipe is higher than the highest temperature of the equipment heat dissipation), through the identification of the pressure sensor on the system, the analysis and execution of the judgment device, the valve in the cold source circuit of the control system automatically switches to the side of the cold storage heat dissipation, and the cold storage absorbs the heat dissipated by the equipment; when the system identifies that the pressure in the pipe meets the conditions for boiling heat dissipation, the valve in the cold source circuit is controlled to automatically switch to the side of boiling heat dissipation, and the heat dissipated by the on-vehicle equipment is continuously absorbed through the boiling of water. Since the train is in a low-vacuum pipeline environment for most of the running time, the system established by using the composite cold source heat dissipation mode can significantly reduce the overall volume and weight of the heat dissipation system, and does not significantly increase the complexity of the system.

[0046] As can be seen from the above embodiments, the composite cold source heat dissipation system for low-vacuum pipelines described in the present invention has at least the following advantages compared with the prior art:

[0047] (1) It is applicable to the heat dissipation of on-vehicle equipment during the whole state process of train operation in a low-vacuum pipeline environment;

[0048] (2) It takes into account the advantages of strong boiling heat dissipation ability of water and the fact that cold storage heat dissipation is not affected by external environmental changes, and realizes the light weight and operation stability of the heat dissipation system;

[0049] (3) The system equipment is compact, simple, has a high degree of integration and strong stability, and has a large heat dissipation per unit volume and weight.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0051] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used herein.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present invention.

[0053] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A composite cold source heat dissipation system applicable to a low-vacuum pipeline, characterized in that, The system includes a liquid cooling circuit for vehicle-mounted equipment and a cold source circuit. The liquid cooling circuit for vehicle-mounted equipment includes a liquid storage tank, a first pump, and a heat exchanger. The cold source circuit includes a second pump, a cold storage tank, a boiling radiator, a first valve, and a second valve. The first pump drives the heat dissipation medium in the liquid storage tank to flow to the equipment to be cooled, taking out the heat of the equipment to be cooled. The heat dissipation medium after absorbing heat flows through the heat exchanger to the cold source circuit. When the pressure in the low-vacuum pipeline meets the conditions for boiling heat dissipation, the second pump drives the heat dissipation medium after absorbing heat to flow through the first valve to the boiling radiator. The heat dissipation medium after being cooled by the boiling radiator flows back to the liquid storage tank through the second valve and the heat exchanger. When the pressure in the low-vacuum pipeline does not meet the conditions for boiling heat dissipation, the second pump drives the heat dissipation medium after absorbing heat to flow through the first valve to the cold storage tank. The heat dissipation medium after absorbing heat in the cold storage tank flows back to the liquid storage tank through the second valve and the heat exchanger.

2. The system according to claim 1, wherein The system further includes a pressure sensor and a judging device. The pressure sensor is used to detect the pressure in the low-vacuum pipeline, and the judging device is used to judge whether the detected pressure meets the conditions for boiling heat dissipation.

3. The system according to claim 2, wherein The heat dissipation medium in the liquid storage tank is water-ethylene glycol.

4. The system according to claim 3, characterized in that, The first valve and the second valve are three-way valves.

5. The system according to claim 4, characterized in that, The system further includes a third valve and a fourth valve. The third valve is arranged between the heat exchanger and the second valve, and the fourth valve is arranged between the heat exchanger and the second pump.

6. The system according to claim 5, wherein The third valve and the fourth valve are two-way valves.

7. The system according to any one of claims 1-6, characterized in that, The first pump and the second pump are power pumps.

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