A GIL cooling device based on airflow insulation

Abstract

This invention belongs to the field of power technology, specifically relating to a GIL cooling device based on airflow isolation. The GIL cooling device of this invention utilizes the cooperation of an air curtain blowing mechanism, a GIL transmission cable, an air curtain return mechanism, and a first heat exchanger. The air curtain blowing mechanism blows out high-pressure airflow to form an air curtain, which on the one hand removes heat from the GIL transmission cable, and on the other hand provides insulation. The air curtain return mechanism recovers the high-pressure airflow, cools it through the first heat exchanger, and then the airflow re-enters the air curtain blowing mechanism for recycling. This constructs a forced circulation, closed-loop heat exchange cooling structure, achieving efficient, controllable, and sustainable cooling and insulation of the GIL transmission cable.

Description

Technical Field

[0001] This invention belongs to the field of power technology, specifically relating to a GIL cooling device based on airflow isolation. Background Technology

[0002] With the continuous growth of power load and the increasing capacity of transmission lines, the Joule heat generated by the resistance effect in transmission cables during operation has increased significantly, leading to a rise in cable temperature. Excessive operating temperature not only accelerates the aging of insulation materials and reduces mechanical strength, but may also cause thermal expansion deformation or even short-circuit faults, seriously threatening the safe and stable operation of the power grid. Therefore, effective cooling of high-voltage or high-current transmission cables has become a key technical requirement in power system operation and maintenance.

[0003] Currently, common cable cooling methods mainly include natural convection, forced air cooling, and liquid cooling systems. Among them, natural convection is limited by ambient temperature and airflow conditions, resulting in low heat dissipation efficiency; while liquid cooling has high heat exchange efficiency, it suffers from problems such as complex structure, high cost, and high risk of leakage.

[0004] In existing technologies, gas cooling devices mostly use external fans to directly blow air onto the surface of the cable (see Chinese Patent CN108767789A, "A Wind-Cooled Cooling Device for High-Voltage Cables"). This method suffers from short airflow paths, insufficient heat exchange, and the inability to form a closed-loop circulation, resulting in low cooling efficiency. Other technologies attempt to add enclosed air ducts to the outside of the cable (such as CN210577432U, "A Cable Heat Dissipation Air Duct Structure"). However, such structures are typically integral sleeves, making installation and disassembly difficult, adaptable to existing cables, and prone to poor sealing, which can easily lead to airflow short circuits or external dust intrusion.

[0005] To address the aforementioned shortcomings, there is an urgent need for a gas cooling system for power transmission cables that features a detachable structure, reasonable airflow organization, reliable sealing, and suitability for high-temperature operating conditions. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a GIL cooling device based on airflow isolation.

[0007] The technical solution adopted in this invention is: a GIL cooling device based on airflow isolation, comprising...

[0008] An air curtain blowing mechanism is fitted onto the GIL transmission cable and blows out an annular air curtain along the surface of the GIL transmission cable;

[0009] An air curtain recirculation mechanism, mounted on the GIL power transmission cable, is used to recover the air curtain;

[0010] The first heat exchanger is equipped with a heat exchange pipe. The first end and the second end of the heat exchange pipe are respectively connected to an air curtain blowing mechanism and an air curtain return mechanism to form an air circulation heat exchange loop.

[0011] To better implement the present invention, the air curtain blowing mechanism includes a first air storage chamber and a high-pressure chamber connected together. The first air storage chamber is connected to a first end, and a high-pressure air nozzle arranged in a ring is provided on the end face of the high-pressure chamber.

[0012] To better implement this invention, the high-pressure air nozzle has two layers: the inner high-pressure air nozzle is 2cm-4cm away from the GIL transmission cable, and the outer high-pressure air nozzle is 5cm-10cm away from the GIL transmission cable.

[0013] To better implement the present invention, the number of inner high-pressure air nozzles and outer high-pressure air nozzles are the same, and their positions are staggered.

[0014] To better implement this invention, the high-pressure air nozzle adopts the SMC AKM series miniature air knife.

[0015] To better implement the present invention, the air curtain recirculation mechanism includes a converging hood and a second air storage chamber connected together, the opening end of the converging hood facing the air curtain blowing mechanism, and the second air storage chamber communicating with the second end.

[0016] To better implement the present invention, the converging shroud is shaped like a trumpet with a large opening at the opening end and a small connecting end.

[0017] To better implement the present invention, the first heat exchanger is equipped with a second heat exchanger, and the second heat exchanger is equipped with a third heat exchanger.

[0018] To better implement the present invention, the second heat exchanger is a water heat exchanger and the third heat exchanger is a cooling tower.

[0019] The beneficial effects of this invention are as follows: This invention provides a GIL cooling device based on airflow isolation. Through the cooperation of an air curtain blowing mechanism, a GIL power transmission cable, an air curtain return mechanism, and a first heat exchanger, the air curtain blowing mechanism blows out high-pressure airflow to form an air curtain. This air curtain removes heat from the GIL power transmission cable and provides insulation. The air curtain return mechanism recovers the high-pressure airflow, cools it through the first heat exchanger, and then re-enters the air curtain blowing mechanism for recycling. This constructs a forced circulation, closed-loop heat exchange cooling structure, achieving efficient, controllable, and sustainable cooling and insulation of the GIL power transmission cable. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of a GIL cooling device based on airflow isolation according to the present invention.

[0022] Figure 2 This is a schematic diagram of a high-pressure gas nozzle installed on the high-pressure chamber of a GIL cooling device based on airflow isolation according to the present invention.

[0023] In the attached diagram, 1—GIL power transmission cable, 2—first gas storage chamber, 3—high pressure chamber, 4—first end, 5—first heat exchanger, 6—converging hood, 7—second gas storage chamber, 8—second end, 9—high pressure gas nozzle, 10—annular air curtain, 11—second heat exchanger, 12—third heat exchanger. Detailed Implementation

[0024] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] In the description of this disclosure, it should be noted that the terms "upper," "inner," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the disclosed product is in use. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0028] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by those skilled in the art.

[0029] Example:

[0030] like Figure 1 , Figure 2 As shown, a GIL cooling device based on airflow isolation according to the present invention includes an air curtain blowing mechanism, which is sleeved on the GIL transmission cable 1 and blows out an annular air curtain 10 along the surface of the GIL transmission cable 1; it also includes an air curtain return mechanism, sleeved on the GIL transmission cable 1, for recovering the air curtain; it also includes a first heat exchanger 5, which is provided with heat exchange pipes, the first end 4 and the second end 8 of the heat exchange pipes being respectively connected to the air curtain blowing mechanism and the air curtain return mechanism to form an air circulation heat exchange loop. In this GIL cooling device based on airflow isolation, through the cooperation of the air curtain blowing mechanism, the GIL transmission cable 1, the air curtain return mechanism, and the first heat exchanger 5, the air curtain blowing mechanism blows out high-pressure airflow to form an air curtain, which on the one hand removes heat from the GIL transmission cable 1, and on the other hand provides heat insulation; the air curtain return mechanism recovers the high-pressure airflow and cools it through the first heat exchanger 5, and the airflow then re-enters the air curtain blowing mechanism for recycling. A forced circulation, closed-loop heat exchange cooling structure was constructed, achieving efficient, controllable, and sustainable cooling and insulation of GIL power transmission cables.

[0031] In some embodiments, the air curtain blowing mechanism includes a first air storage chamber 2 and a high-pressure chamber 3 connected together. The first air storage chamber 2 is connected to a first end 4, and a ring-shaped arrangement of high-pressure air nozzles 9 is provided on the end face of the high-pressure chamber 3. By utilizing a dual-chamber pressure-stabilized air supply pipeline in conjunction with a ring-shaped high-pressure jet layout, a three-dimensional air curtain barrier with fast response, high pressure, good continuity, and strong anti-interference ability is constructed.

[0032] Furthermore, the high-pressure air nozzle 9 consists of two layers. The inner high-pressure air nozzle 9 is 2cm-4cm away from the GIL transmission cable 1, and the outer high-pressure air nozzle 9 is 5cm-10cm away from the GIL transmission cable 1. This design allows the two layers of high-pressure air nozzles 9 to operate independently or simultaneously, ensuring the normal operation of the air curtain. The outer, large-diameter air curtain is prone to creating a low-speed backflow zone (dead zone) near the object's surface. The inner layer's close-range spray effectively disrupts this boundary layer, ensuring that there are no dead zones on the surface of the GIL transmission cable 1.

[0033] In a further preferred embodiment, the number of inner high-pressure air nozzles 9 and outer high-pressure air nozzles 9 are the same, and their positions are staggered. The staggered arrangement means that they compensate for each other in the radial direction; for example, there are thirty inner and thirty outer high-pressure air nozzles 9, with one inner high-pressure air nozzle 9 positioned between two outer high-pressure air nozzles 9. This solution, through the ingenious design of equal numbers and staggered positions, solves the problems of airflow gaps and uneven flow fields that easily occur in traditional concentric circle nozzle arrangements, constructing a dense, leak-free, highly interference-resistant, uniformly heat-dissipating, and cable-friendly high-performance dynamic air curtain barrier.

[0034] Preferably, the high-pressure air nozzle 9 adopts the SMC AKM series miniature air knife, which has the advantages of compact structure, space saving, uniform airflow, low noise, energy saving and flexible installation.

[0035] In some embodiments, the air curtain recirculation mechanism includes a converging hood 6 and a second air storage chamber 7 connected together. The opening end of the converging hood 6 faces the air curtain blowing mechanism, and the second air storage chamber 7 is connected to the second end 8. The converging hood 6 can accurately collect high-speed airflow carrying heat, preventing hot air from diffusing around the equipment and heating the ambient temperature, thus realizing the directional export and processing of heat.

[0036] Preferably, the converging hood 6 is flared, with a larger opening at the top and a smaller connecting end. Due to the larger opening, the converging hood 6 has relatively relaxed requirements regarding installation distance. Even if the distance between the air curtain blowing mechanism and the converging hood 6 changes slightly due to site conditions, the large opening still ensures effective airflow capture, reducing the difficulty of installation and debugging.

[0037] In some embodiments, the first heat exchanger 5 is coupled with a second heat exchanger 11, and the second heat exchanger 11 is coupled with a third heat exchanger 12. A single heat exchanger often struggles to maintain both high efficiency and precise temperature control simultaneously over a wide temperature range. By using a three-stage arrangement of the first heat exchanger 5, the second heat exchanger 11, and the third heat exchanger 12, the system can establish a temperature gradient. The gas, after undergoing three stages of buffering and temperature regulation, exhibits minimal temperature fluctuations, avoiding thermal stress fatigue on the GIL metal casing and insulation components caused by alternating hot and cold temperatures, thus extending the equipment's lifespan.

[0038] In some embodiments, the second heat exchanger 11 is a water heat exchanger, and the third heat exchanger 12 is a cooling tower. The second heat exchanger 11, as a water heat exchanger, serves as an intermediate medium exchanger. It does not directly contact the air, but instead transfers heat from the circulating gas through the pipe walls to the internally flowing cooling water. The third heat exchanger 12, as a cooling tower, serves as the final heat dissipation terminal. It receives hot water from the water heat exchanger, dissipates heat into the atmosphere through direct contact between water and air (evaporative cooling + sensible heat exchange), and recycles the cooled water back to the second heat exchanger 11.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A GIL cooling device based on airflow isolation, characterized in that: include An air curtain blowing mechanism is fitted onto the GIL power transmission cable (1) and blows out an annular air curtain (10) along the surface of the GIL power transmission cable (1). An air curtain recirculation mechanism is mounted on the GIL power transmission cable (1) and is used to recover the air curtain; The first heat exchanger (5) is provided with a heat exchange pipe. The first end (4) and the second end (8) of the heat exchange pipe are respectively connected to the air curtain blowing mechanism and the air curtain return mechanism to form an air circulation heat exchange circuit.

2. The GIL cooling device based on airflow isolation according to claim 1, characterized in that: The air curtain blowing mechanism includes a first air storage chamber (2) and a high-pressure chamber (3) connected together. The first air storage chamber (2) is connected to the first end (4), and a high-pressure air nozzle (9) arranged in a ring is provided on the end face of the high-pressure chamber (3).

3. The GIL cooling device based on airflow isolation according to claim 2, characterized in that: The high-pressure air nozzle (9) has two layers. The distance between the inner high-pressure air nozzle (9) and the GIL power transmission cable (1) is 2cm-4cm, and the distance between the outer high-pressure air nozzle (9) and the GIL power transmission cable (1) is 5cm-10cm.

4. The GIL cooling device based on airflow isolation according to claim 3, characterized in that: The number of inner high-pressure air nozzles (9) and outer high-pressure air nozzles (9) are the same, and their positions are staggered.

5. The GIL cooling device based on airflow isolation according to claim 4, characterized in that: The high-pressure air nozzle (9) adopts the SMC AKM series micro air knife.

6. The GIL cooling device based on airflow isolation according to claim 1, characterized in that: The air curtain return mechanism includes a converging hood (6) and a second air storage chamber (7) connected together. The opening end of the converging hood (6) faces the air curtain blowing mechanism, and the second air storage chamber (7) is connected to the second end (8).

7. The GIL cooling device based on airflow isolation according to claim 6, characterized in that: The converging cover (6) is shaped like a trumpet with a large opening at the opening end and a small connecting end.

8. The GIL cooling device based on airflow isolation according to claim 1, characterized in that: The first heat exchanger (5) is equipped with a second heat exchanger (11), and the second heat exchanger (11) is equipped with a third heat exchanger (12).

9. The GIL cooling device based on airflow isolation according to claim 8, characterized in that: The second heat exchanger (11) is a water heat exchanger, and the third heat exchanger (12) is a cooling tower.

Images