Corrugated pipe cooling and energy-saving device for unattended machine room or base station

Abstract

When equipment in a closed unattended machine room or base station works, heat can be generated, and the room temperature is increased. The invention discloses a corrugated pipe cooling and energy-saving device for an unattended machine room or a base station, which aims at solving the problem that in order to maintain the normal working temperature of equipment, an air conditioner must be used for cooling, so that a lot of electric quantity is consumed. When the outdoor temperature is lower than the indoor hot air temperature, hot air in the pipeline exchanges heat with outdoor cold air through the pipeline wall, and the air automatically flows back into a room after being cooled outdoors, so that cooling and energy saving are achieved. The whole outdoor circulating flow process is completely automatically carried out, energy does not need to be provided, the device is extremely low in structure cost, safe and reliable, maintenance is not needed, noise and pollution are completely avoided, the working time of the air conditioner can be obviously shortened, and the effects of saving electricity and prolonging the service life of the air conditioner are achieved.

Description

Technical Field The present invention belongs to the technical field of energy saving for communication rooms and base stations. Background Art Various unattended computer rooms and tens of thousands of mobile communication base stations with electrical equipment running automatically all year round are usually in a closed state because they are unattended. The communication equipment inside will continuously generate heat during operation. If the heat cannot be dissipated in time, the indoor temperature will continue to rise, making it difficult for the equipment to continue to operate normally. In order to maintain the normal working temperature of the equipment, the heat generated by the equipment during operation must be dissipated to the outside. For this purpose, air conditioners are usually used for temperature control (cooling). The accumulated power consumption of each computer room and mobile communication base station for temperature control and air conditioning to maintain the normal working temperature is not small. More than ten years ago, a fresh air energy-saving system appeared that used the introduction of outdoor cool air to cool the equipment when the outdoor temperature was low. Although this fresh air energy-saving system can save energy, it must also introduce outdoor cool air to cool the equipment. In addition, the ventilation volume of ordinary fresh air systems is still relatively large, and it is easy to bring outdoor dust and other pollutants into the room. Even if an air filter device is used at the air inlet, it not only requires frequent maintenance, but it is still difficult to avoid indoor pollution. The ventilation system not only still consumes a lot of electricity, but also needs to be equipped with a relatively complex automatic control system.

[0003] The "bellows cooling and energy-saving device for unattended machine rooms or base stations" proposed in the present invention is a sealed metal bellows pipe system with a relatively large surface area placed outdoors. It uses the chimney effect to suck indoor hot air into it. When the outdoor temperature is lower than the indoor hot air temperature, the different specific gravities of hot and cold air are used to generate a siphon effect in the sealed corrugated pipe that generally rises first and then falls, forming automatic circulating ventilation, and exchanging heat with outdoor cool air through the metal bellows wall with a large surface area and easy heat transfer, so as to achieve heat dissipation and cooling of indoor hot air. This cooling system does not require energy supply or maintenance, and can continuously dissipate heat and cool down the machine room or base station, thereby greatly reducing the start-up time of the air conditioner and achieving the purpose of energy saving, and will not enter outdoor impurities and pollutants such as dust. Summary of the invention "The bellows cooling and energy-saving device used in unattended computer rooms or base stations" is a cooling and energy-saving device composed of a soft metal bellows that is easy to transfer heat and is used in unattended computer rooms or base stations. This device is installed outdoors in the computer room or base station and consists of one or several (a group of) independent sealed metal bellows pipe systems that are generally inverted V-shaped. Compared with similar metal finned tubes with large heat dissipation areas, the advantages of metal bellows are that they are easier to process into products with larger pipe diameters, and they are thinner, lighter, and cheaper. However, since the metal bellows is a soft tube and cannot stand upright by itself, it needs a rigid "skeleton" that can help it "shape" to support and support it. Therefore, the composition of this device not only uses sealed metal bellows from the air inlet of the pipe (i.e., the air outlet above the room) to the air outlet of the pipe (i.e., the air inlet below the room), but also must be equipped with and rely on a rigid "skeleton" that can give the soft metal bellows a certain shape and specify the specific direction and distribution of the pipe. This is very different from the metal finned tube heat dissipation system. Therefore, the metal bellows heat dissipation system comprises: an air inlet [1] and an air inlet pipe [2], an ascending air pipe [3] supported by a rigid trapezoidal vertical frame [3'], a top curved pipe [4], a soft curved descending air pipe [5] supported by a downwardly inclined rigid frame "bed" [5'], and an air outlet pipe [6] and an air outlet [7] for guiding the cooler air after heat dissipation back to the room. The ascending air pipe [3], the top curved pipe [4] and the curved descending air pipe [5] are all metal bellows that are easy to conduct heat. The air inlet pipe [2] and the air outlet pipe [6] are metal or plastic curved pipes with a diameter matching the bellows and a 90-degree bend. After the indoor hot air is drawn out from the indoor through the air inlet [1] and the air inlet pipe [2], it first rises upward in the vertical upward air pipe [3] by utilizing the chimney effect, and after reaching the top of an appropriate height, it turns through the top curved pipe [4], and then follows the horizontally curved bellows descending air pipe [5] that "lies" on the rigid frame "bed" [5'], and then moves diagonally downward to dissipate heat and cool down. Then the air returns to the room through the air outlet pipe [6] and the air outlet [7]. The reason why the downward air pipe [5] is bent back and forth is to extend the length of the metal pipe that can dissipate heat as much as possible and enhance the heat dissipation capacity. The entire upward air pipe [3], the top curved pipe [4] and the downward air pipe [5] that bends back and forth are all located above the machine room or base station building. Only the end of the downward air pipe [5] is no longer bent at a section below the roof of the machine room or base station building, but is vertically downward and connected to the air outlet pipe [6] and the air outlet [7].Since the metal bellows is a soft tube and cannot be shaped by itself, not only the ends of the vertically upward ascending air pipe [3] and the vertically downward descending air pipe [5] need to be supported by a rigid trapezoidal vertical frame [3'], but also the descending air pipe [5] that bends back and forth also needs to be supported by an inclined frame "bed" [5'] that can be shaped. The reason why a vertical frame "bed" is not used to support the descending air pipe [5] that bends back and forth, but a downward inclined frame "bed" [5'] is used to support it is to avoid the hot air outside the pipe generated when the bent bellows at the lower (lower) position dissipates heat and then rises to heat the bellows at the upper (higher) position, thereby reducing the overall heat dissipation effect. Therefore, it is necessary to use an inclined frame "bed" to stagger the vertical positions of the bent metal bellows at the upper (higher) and lower (lower) positions. As for the tilt angle, it can be determined according to the specific conditions of the machine room or base station. Each set of bellows heat dissipation system can use a single metal bellows, or use a pair of metal bellows arranged in parallel with a slight distance to dissipate heat. The end portion of the downwardly inclined descending air pipe [5] below the roof of the machine room or base station is no longer bent, but is directly connected to the outlet pipe [6] vertically downward. When a pair of metal bellows arranged in parallel is used for heat dissipation, the ends of the two bellows descending air pipes [5] bent in parallel and downward below the roof of the machine room or base station are directly connected to the outlet pipe [6] and the air outlet [7] vertically downward.

[0004] Soft metal bellows that are easy to dissipate heat are usually made of metal materials such as stainless steel, aluminum or copper.

[0005] This automatic circulation ventilation and heat dissipation system composed of metal bellows must be sealed, otherwise it will not produce a siphon effect and will not form automatic ventilation. The air flowing inside the pipe is indoor air, which does not communicate with the outdoor air outside the pipe. The main heat dissipation parts of this airtight metal corrugated pipe ventilation and heat dissipation system are the vertically erected upward air pipe [3], the top bend pipe [4] and the downward air pipe [5]. The air inlet [1] (also the air outlet above the room) and the air inlet pipe [2] of the pipe system are connected to the upper space where the hot air in the room of the machine room or base station is located, and the air outlet pipe [6] and the air outlet [7] (also the air inlet below the room) of the cooler air after heat dissipation are connected to the lower space where the cooler air in the room of the machine room or base station is located. The air inlet pipe [2] and the air outlet pipe [6], whose diameters match the caliber of the bellows, can be made of metal or plastic with a 90-degree bend.

[0006] The height of this inverted V-shaped metal bellows sealed pipe heat dissipation system, that is, the height of the top bend [4], is usually about 3 meters, that is, generally about 3 meters higher than the roof of the machine room or base station, and the diameter of the pipe is between 3 cm and 20 cm. According to the specific situation, the height of the pipe structure selected for a large base station (macro base station) is generally about 2.5 meters (roughly equivalent to the height of a floor of a building), and the pipe diameter is preferably about 15 cm. According to the size of the heat generated by the indoor equipment, a base station can be installed with one, two, three or more sets of metal bellows heat dissipation systems. Each heat dissipation system can use a single-tube metal bellows, or a double-tube parallel metal bellows slightly separated for heat dissipation. For the metal bellows heat dissipation system used in a small base station (cabinet), its height can be about 1 meter to 2 meters, and its diameter can be about 2 cm to 5 cm.

[0007] In order to dissipate heat better, a water cooling jacket

[12] may be added to the outer side of the curved downward portion of the bellows downward air pipe [5]. The water inlet of the water cooling jacket is at the bottom, while the water outlet is at the top. The water cooling jacket is also made of metal that is easy to conduct heat, and may also be provided with a heat sink that can enhance heat dissipation. Since the specific heat of water is much greater than that of air, the cooling water used to cool the indoor hot air only needs a small flow rate to meet the needs. When water cooling is adopted, it is better that the diameter of the curved downward bellows is slightly smaller, so that it is easier to exchange heat with the cooling water. The hotter cooling water flowing out of the upper water outlet can be drained into a pool for other uses, or can be drained into a set of tortuous and long heat dissipation pipes for air cooling. After the heat is dissipated by the tortuous and long heat dissipation pipes, it can flow back to the water cooling jacket from the lower water inlet to continue to automatically dissipate heat for the bellows. In this way, there is no need to add new cooling water. It is necessary to pay attention to the good sealing of the inlet and outlet of the water cooling jacket and the bellows. Adopting this solution is equivalent to adding another set of water cooling device to the bellows cooling system of the computer room or base station.

[0008] The basic operating principle of the "bellows cooling and energy-saving device for unattended computer rooms or base stations" is that when the outdoor temperature is lower than the temperature of the hot air above the room, the air in the ascending air pipe [3] and the descending air pipe [5] of the vertical sealed metal pipe has different heat and coolness, and thus has different specific gravities, so that the hotter and lighter air in the ascending air pipe [3] rises (chimney effect), while the cooler and heavier air in the descending air pipe [5] sinks, forming a siphon effect in the sealed pipe, generating automatic one-way flow, thereby automatically guiding (sucking) the hot air in the computer room or base station room out of the room, flowing through the outdoor metal bellows sealed pipe, and exchanging heat with the cooler air outside through the metal bellows pipe wall with a large area for easy heat transfer, and then flowing back into the room after being cooled, so that the temperature of the indoor air can be reduced through the automatic circulation of hot and cool air. Here, a key issue is that the entire pipe system must be airtight, otherwise it is difficult to form a siphon effect. The flow of air in the sealed bellows pipe circulates automatically using natural principles.

[0009] In summer, when the outdoor temperature is higher than the temperature of the hot air above the room, even if the outdoor hot air can heat the air in the bellows pipe, since the vertically erected ascending air pipe [3], the top curved pipe [4] and the curved descending air pipe [5] of the metal bellows heat dissipation system are all located at a position higher than the roof, the specific gravity of the air in the pipe heated by the hot air with a higher temperature outside is less than the specific gravity of the hot air above the room, and thus it will not flow back into the room. Although the vertically downward end of the descending air pipe [5] is also outdoors, it is on the shady side and is relatively short, so reverse flow will not generally occur. Of course, if necessary, a light one-way valve can be added to the air outlet of the pipe system, which can be easily opened when the gas flows forward and does not hinder the gas flow, and closed when the gas flows in the reverse direction, so that only gas is discharged but not inletted. This ensures that the gas in the pipe does not flow back.

[0010] The inverted V-shaped pipe heat dissipation structure of the "corrugated pipe cooling and energy-saving device used in unattended computer rooms or base stations" for heat dissipation and cooling is made of metal materials that are easy to transfer heat. And because it is used outdoors, the material itself must be weather-resistant, such as stainless steel bellows or aluminum metal bellows, or copper or steel with weather-resistant surface treatment.

[0011] Furthermore, since the "bellows cooling and energy-saving device used in unattended computer rooms or base stations" is used outdoors, it is inevitable that it will be exposed to the sun. Sunlight is not conducive to heat dissipation, so it is necessary to install a sunshade that can protect against the sun

[10] . The shape of the sunshade should be adapted to the direction of the pipeline system, with the principle of both shading and not blocking the wind. It should be arranged in a dispersed manner, slightly away from the heat dissipation pipeline, and not in contact with the heat dissipation pipeline, to avoid transferring the heat generated by the sun to the heat dissipation pipeline. In the northern hemisphere, the sun is in the south, and the overall bellows cooling structure with high south and low north is selected to help reduce the shading area.

[0012] In order to achieve a good cooling effect when the outdoor temperature is close to the temperature of the indoor hot air but still lower than the indoor hot air temperature, a small fan [9] with a wind collecting cover [8] can be installed in front of the air inlet [1] in the machine room or base station room. The diameter of the air outlet of the wind collecting cover is slightly smaller than the diameter of the air inlet [1]. The fan is installed in alignment with the air inlet [1] but is separated from the air inlet [1] by a certain distance and is not connected. In this way, the flow of gas in the pipeline can be accelerated when the small fan is turned on, and the automatic flow of gas will not be hindered when the small fan is not turned on. Here, the start of the small fan needs to be automatically controlled so that it is only started when the outdoor temperature is still lower than the temperature of the indoor hot air above, and once the outdoor temperature is higher than the temperature of the indoor hot air above, the small fan is automatically turned off. This is very important. If the small fan is turned on when the outdoor temperature is higher than the indoor hot air above, the hot air in the outdoor pipeline will be blown into the room, which is not conducive to heat dissipation. The power supply of the small fan can be solar power, and the solar panel

[11] can be installed on the sunshade

[10] .

[0013] It is also possible not to install a small fan, and rely entirely on the power of natural siphoning to produce outdoor circulation of gas with a cooling effect. Once the outdoor air temperature is higher than the temperature of the hot air above the room, the gas in the pipe heated by the outdoor gas will have a smaller specific gravity than the hot air above the room. Therefore, the air in the higher pipe that is hotter than the hot air above the room will not automatically flow down into the room. Of course, if a one-way valve that only lets air out but not in is installed at the air outlet of the pipe, this problem will not occur.

[0014] When a large amount of heat is required, a conventional axial flow exhaust fan with a large air volume can be used instead of a small fan. One axial flow fan can be used with multiple sets of multi-pipe bellows cooling systems. This requires a special one-machine-with-multiple-ports pipe inlet structure.

[0015] The vertical frame [3'] supporting the ascending air pipe [3] and the inclined frame "bed" [5'] connected thereto and supporting the descending air pipe [5] must be able to stand firmly and stably on the ground and be supported by the auxiliary support of the load-bearing parts of the building.

[0016] The communication room or base station adopts this "bellows cooling and energy-saving device for unattended room or base station" to achieve energy saving, which is not only extremely low in cost, but also safe and reliable, does not require maintenance, and has no noise and pollution. Although it cannot completely replace the role of air conditioners, since this cooling device can continuously cool the room when the outdoor temperature is lower than the indoor hot air temperature most of the year, it can significantly reduce the working time of the air conditioner, save the electricity of the air conditioner, extend the service life of the air conditioner, reduce the electronic waste formed by the scrapped air conditioner, and the pollution of the refrigerant released when it is damaged to the atmospheric environment. At the same time, this low-cost infrastructure will not become a target of thieves like air conditioners, and will not lose its effectiveness due to theft. As long as the outdoor temperature is not higher than the temperature of the indoor hot air for most of the year, this device can continue to operate automatically and play a role in cooling and energy saving.

[0017] This energy-saving device is suitable for use throughout the country. Even in the southern regions with relatively high temperatures, most of the time (especially at night) the outdoor temperature is lower than the indoor hot air. This cooling device can automatically save energy. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the longitudinal direction of the "corrugated pipe cooling and energy-saving device used in unattended computer rooms or base stations" when viewed from the side, its attachment and installation on the vertical support frame and the inclined support "bed", as well as its connection to the upper and lower space walls of the computer room or base station, which also represents the path of indoor air flow in this cooling and energy-saving device.

[0019] Wherein, number [1] indicates the air inlet of such device, which is also the air outlet of the upper wall of the machine room or base station; number [2] indicates the air inlet pipe of the pipe device; number [3] indicates the ascending air pipe; number [3'] indicates the rigid trapezoidal bracket supporting the end sections of the ascending air pipe and the descending air pipe; number [4] indicates the top bent pipe; number [5] indicates the descending air pipe; number [5'] indicates the inclined rigid frame "bed" supporting the bent descending air pipe; number [6] indicates the air outlet pipe; number [7] indicates the air outlet of the pipe system, which is also the air inlet of the wall of the lower space of the machine room or base station; number [8] indicates the wind collector of the small fan; number [9] indicates the small fan; number

[10] indicates the sunshade panel; number

[11] indicates a solar panel installed on the sunshade

[10] ; number

[12] indicates a water cooling jacket installed outside the curved downward bellows; number

[13] indicates an air cooling and temperature reduction device for cooling the cooling water matched with the water cooling jacket

[13] installed outside the bellows; number

[14] indicates a water outlet pipe above the water cooling jacket, which is connected to the top of the air cooling and temperature reduction device

[13] ; number

[15] indicates a water return pipe for water cooled by the air cooling and temperature reduction device

[13] from the bottom of the air cooling and temperature reduction device

[13] for cooling the cooling water to flow to the water cooling jacket installed outside the bellows; in general, in order to simplify the structure, the water cooling jacket and its matching air cooling and temperature reduction system may not be installed. DETAILED DESCRIPTION

[0020] The upward air pipe of the "corrugated pipe cooling and energy-saving device for unattended machine room or base station" and the rigid ladder bracket [3'] supporting the upward air pipe are usually installed outside the wall of the machine room or base station facing the sun, at an appropriate distance from the wall, and the air intake pipe [2] and the upward air pipe [3] made of metal or plastic with a 90-degree bend are installed between the ladder bracket and the wall; the top of the rigid ladder bracket [3'] is about 3 meters higher than the top of the machine room or base station building, and the top of the rigid ladder bracket [3'] is in contact with the rigid bracket [3'] which is inclined downward and supports the curved downward air pipe. The top of the rigid frame "bed" [5'] is connected together. The downgoing air pipe [5] of the soft corrugated pipe is erected ("lying") on the rigid frame "bed" [5'] in a transverse bending manner, and is tilted and bent from high to low from the top of the rigid trapezoidal bracket [3'] on the sunny side of the machine room or base station, and is tilted and bent all the way down to the position near the roof of the shady side wall of the machine room or base station, and then supported by the rigid trapezoidal bracket [3'], it turns vertically downward along the outer edge of the shady side wall until it is connected to the outlet pipe [6] below the wall.

[0021] According to the heating conditions of indoor equipment, a base station can be installed with one, two, three or more sets of metal bellows cooling systems. Each cooling system can use a single-tube metal bellows, or a double-tube parallel metal bellows for heat dissipation. Usually, the top height of the bellows cooling device of a large base station is about 3 meters above the top of the machine room or base station building, and the diameter of the bellows is about 15 cm. Double-tube parallel method can be used for heat dissipation.

[0022] For the metal bellows heat dissipation system used in small base stations (cabinets), its height can be around 1 meter to 2 meters, and its diameter can be around 2 centimeters to 5 centimeters. Since the top area of ​​small base stations is small, their downlink air pipes can spiral down.

[0023] In order to simplify the structure, a water cooling jacket is generally not provided. If a water cooling jacket is provided, the diameter of the bellows can be slightly smaller to facilitate heat exchange between the gas in the tube and the cooling water in the water cooling jacket outside the tube. It is best to use finned tubes as pipes for cooling the cooling water, instead of air cooling devices

[13] . Finned tubes, which are not easy to make larger in diameter, are very advantageous for cooling the cooling water. It is only necessary to install a short section of finned tubes with an inner diameter of about 2 cm in parallel in a suitable shaded place near the cooling water jacket

[12] , and install them from the upper part of the cooling water jacket

[12] . By directing the hotter cooling water to the fin tubes, and after the heat is dissipated by the fin tubes, the water flows back to the cooling water jacket from the fin tubes

[12] , a special air cooling device

[13] can be replaced to dissipate the heat of the cooling water and allow the cooling water to flow back to the water cooling jacket after the heat is dissipated. When pouring cooling water into the water cooling jacket, a water filling pipe and a valve need to be specially installed above the water cooling jacket, and an air release valve like the air release valve of a heating device is set at a higher position of the cooling water jacket to prevent air from being trapped in the water cooling jacket and affecting the circulation of the cooling water.

Claims

1. A bellows cooling and energy-saving device for use in an unattended machine room or base station, characterized in that The invention is installed outdoors in a machine room or a base station, and is composed of one or more independent soft sealed metal bellows that are generally in an inverted V shape and are easy to dissipate heat, including: an air inlet [1] and an air inlet pipe [2], an upward air pipe [3] supported by a rigid trapezoidal vertical frame [3'], a top curved pipe [4], a soft curved downward air pipe [5] supported by a downwardly inclined rigid frame "bed" [5'], an air outlet pipe [6] and an air outlet [7]. The pipe of the bellows is connected to the air inlet pipe [2], and the air inlet [1] is provided with a At the location where the hot air is located above the room of the machine room or base station, supported by a vertically erected rigid trapezoidal support [3'], the upward air pipe [3] of the corrugated pipe is vertically upward, so that the hot air above the room rises in the pipe, and after reaching the top bend pipe [4] at an appropriate height, it turns and slants downward into the soft and curved downward air pipe [5], and relies on the inclined rigid support [5'] to bend and slants downward until it connects with the outlet pipe [6] at the bottom of the machine room or base station, and introduces the cooled air in the pipe into the room through the outlet.

2. The bellows cooling and energy-saving device for use in an unattended machine room or base station according to claim 1 is characterized in that The bellows used for heat dissipation and cooling are made of a metal material that is easy to conduct heat, preferably a stainless steel bellows or an aluminum bellows, or copper or other metals that have been subjected to a weathering surface treatment. In addition to the upward air pipe [3], the top bent pipe [4] and the curved downward air pipe [5] being bellows made of a metal that is easy to conduct heat, such as aluminum, stainless steel or copper, the air inlet pipe [2] and the air outlet pipe [6] are bent pipes made of metal or plastic with a diameter matching the caliber of the bellows.

3. The bellows cooling and energy-saving device for use in an unattended machine room or base station according to claim 1 is characterized in that the entire uplink The air pipe [3], the top bent pipe [4] and the bent down pipe [5] are all located above the machine room or base station building, and only the end of the down pipe [5] which is below the roof of the machine room or base station building is vertically connected to the air outlet pipe [6] and the air outlet [7].

4. The bellows cooling and energy-saving device for use in an unattended machine room or base station according to claim 1 is characterized in that Each machine room or base station may be provided with one or more sets of bellows heat dissipation devices. Each set of bellows heat dissipation system may use a single-tube metal bellows or a double-tube parallel metal bellows for heat dissipation. The end portion of the downwardly curved downward air pipe [5] below the roof of the machine room or base station is no longer curved, but is directly vertically downward to connect with the outlet pipe [6].

5. The bellows cooling and energy-saving device for use in an unattended machine room or base station according to claim 1 is characterized in that The height of this inverted V-shaped metal bellows sealed pipe heat dissipation system, that is, the height of the top bend [4], is usually about 3 meters higher than the roof of the machine room or base station, and the diameter of the pipe is between 3 cm and 20 cm; for the metal bellows heat dissipation system used in small base stations, its height can be about 1 meter to 2 meters, and its diameter can be about 2 cm to 5 cm.

6. The bellows cooling and energy-saving device for use in an unattended computer room or base station according to claim 1 is characterized in that a water cooling jacket [12] can be added outside the curved downward portion of the bellows downward air pipe [5], the water cooling jacket is made of metal that is easy to conduct heat, the water inlet is at the bottom, and the water outlet is at the top, and the hotter cooling water flowing out of the upper water outlet can be diverted to a pool for other uses, or diverted to a set of special heat dissipation pipes [13] for air cooling, or diverted to a section of finned tubes for air cooling, and after air cooling, it flows back to the water cooling jacket from the water inlet below the water cooling jacket [12] to continue to automatically dissipate heat for the bellows.

7. The bellows cooling and energy-saving device for use in an unattended machine room or base station according to claim 1 is characterized in that A light one-way valve is installed at the gas outlet [7] of the pipeline system. When the gas flows in the forward direction, it is easy to open without hindering the gas flow. When the gas flows in the reverse direction, it is closed, only gas is discharged but not inletted. This ensures that the gas in the pipeline will not flow back.

8. The bellows cooling and energy-saving device for use in an unattended machine room or base station according to claim 1 is characterized in that Install a sunshade to protect the sun from the sun on the sunny side [10].

9. The bellows cooling and energy-saving device for use in an unattended machine room or base station according to claim 1, characterized in that A small fan [9] with an air collecting hood [8] and an automatic control function is installed before the air inlet [1] in the machine room or base station room, or an axial flow exhaust fan is used instead of the small fan. The fan is only started when the outdoor temperature is lower than the temperature of the hot air above the room, and is powered by a solar cell [11].

Images