CN111561341A

CN111561341A - Tunnel cooling car

Info

Publication number: CN111561341A
Application number: CN202010480493.9A
Authority: CN
Inventors: 林福地; 黄君
Original assignee: China Railway Construction Investment Group Co Ltd
Current assignee: China Railway Construction Investment Group Co Ltd
Priority date: 2020-05-30
Filing date: 2020-05-30
Publication date: 2020-08-21

Abstract

The invention relates to a tunnel cooling vehicle, which comprises a carrying vehicle, and a jet fan, a quick cooling grid, a liquid outlet pipe, a liquid return pipe, a circulating pump, a heat exchanger and a closed refrigerator which are assembled on the carrying vehicle; the circumferential side wall of the air inlet end of the jet flow fan is connected with at least one air inlet pipe, the air inlet end of the air inlet pipe inclines towards the lower position of the tunnel, and the air outlet end of the air inlet pipe inputs air to the jet flow channel of the jet flow fan along the tangential direction; the air in the tunnel is sucked by the air inlet pipe and is obliquely emitted to the high position of the tunnel under the driving of the jet fan; the circulating pump drives the heat exchange liquid to continuously flow in a unidirectional circulation manner along the heat exchanger, the circulating pump, the quick cooling grid, the pre-cooling grid, the liquid return pipe and the heat exchanger. This intake pipe can absorb the hot-air of low-lying department and tangent line jettison jet flow channel and form rotatory air current, is favorable to even and comprehensive with heat transfer for the cooling grid and high-efficient cooling of hot-air, and cold air directive eminence drives the hot-air downwards and forms the heat transfer circulation of cold and hot air, and the cooling effect is obvious.

Description

Tunnel cooling car

Technical Field

The invention relates to the field of tunnel cooling equipment, in particular to a tunnel cooling and ventilating device with low-humidity air supply.

Background

The construction engineering of the tunnel is often encountered in the construction process of the railway and the highway, and the construction environment temperature is high (the rock temperature of the zang railway mulberry mountain tunnel with the highest rock temperature is 81.9 ℃) because the rock temperature is high in the construction of the tunnel. When the construction temperature is higher than 28 ℃ of the air temperature in the tunnel specified in the railway tunnel construction Specification TB10120-2002, the high ground temperature thermal hazard of the tunnel causes the reduction of the labor capacity of constructors, the health influence is large, the incidence rate of altitude diseases is greatly improved, the failure rate of mechanical equipment is obviously increased, and the construction efficiency is seriously reduced. Therefore, construction cooling in a high-temperature tunnel environment is necessary. The traditional cooling mode is to strengthen mechanical ventilation, or to adopt spraying equipment to cool by liquid mist, or to directly place ice blocks in the working environment. However, the mechanical ventilation is enhanced, the air volume and the air speed for pressing in are greatly improved, the difficulty is great, the cooling effect is very limited, and the operation cost is high; the spraying equipment is adopted to cool by using liquid fog, so that the interior of the hole is in a high-humidity state, the health of construction personnel is damaged, and the normal use of the construction equipment is influenced; the ice blocks are directly placed in the working environment, the temperature is reduced by 3-5 ℃ within 3.5m around the ice blocks, the temperature reduction is low, and the temperature reduction effect is not obvious.

In addition, current tunnel heat sink disposes the jet fan usually, and the jet flow passageway of jet fan is the straight line and extends the structure usually, and the flow of air in this jet flow passageway is too smooth and easy, causes inspiratory hot-air not yet to carry out abundant heat transfer with the heat exchanger and has jetted out promptly, leads to the higher and cold and hot inequality of air temperature that the jet fan jetted out, and then leads to tunnel heat sink's cooling efficiency comparatively low, and tunnel cooling effect is not obvious.

Disclosure of Invention

The invention provides a tunnel cooling vehicle, which aims to solve the problems that hot air is difficult to sufficiently cool, so that the temperature of ejected air is high, cold and hot are uneven, the tunnel cooling effect is not obvious, the environmental humidity is greatly improved in the cooling process, the labor force and the health of construction personnel are influenced, and the efficient operation of construction equipment is influenced.

The invention adopts the following technical scheme:

a tunnel cooling vehicle comprises a carrying vehicle, and a jet fan, a cooling grid, a liquid outlet pipe, a liquid return pipe, a circulating pump, a heat exchanger and a closed refrigerator which are assembled on the carrying vehicle. At least one air inlet pipe is connected to the circumferential side wall of the air inlet end of the jet flow fan, and the air inlet pipe is preferably a corrugated pipe capable of freely stretching and bending. The air inlet end of the air inlet pipe inclines towards the lower position of the tunnel, and the air outlet end of the air inlet pipe inputs air to the jet flow channel of the jet flow fan along the tangential direction; the tunnel air is sucked by the air inlet pipe and is obliquely emitted to the high position of the tunnel under the driving of the jet flow fan. The cooling grid comprises a pre-cooling grid and a quick-cooling grid, the pre-cooling grid and the quick-cooling grid are both of spiral structures formed by spirally bending a single pipeline, and the liquid outlet end of the quick-cooling grid is communicated and fixedly connected with the liquid inlet end of the pre-cooling grid into a whole; the jet flow fan is internally provided with a blast mechanism, and the blast mechanism, the quick cooling grid and the pre-cooling grid are fixedly arranged in a jet flow channel of the jet flow fan in a front-back sequential arrangement mode along the jet flow direction. The heat exchanger is arranged in the closed refrigerator, and a cold source is filled in the closed refrigerator. The liquid outlet end of the heat exchanger, the circulating pump and the liquid inlet end of the quick cooling grid are communicated through the liquid outlet pipe in sequence, and the liquid outlet end of the pre-cooling grid is communicated with the liquid inlet end of the heat exchanger through a liquid return pipeline. The circulating pump drives the heat exchange liquid to continuously flow in a unidirectional circulation manner along the liquid outlet end of the heat exchanger, the liquid outlet pipe, the circulating pump, the liquid outlet pipe, the quick cooling grid, the precooling grid, the liquid return pipe, the liquid inlet end of the heat exchanger and the interior of the heat exchanger.

Further improve ground, fixed mounting has the air inlet connecting seat on the circumference lateral wall of above-mentioned jet fan, and the inlet end tip of each this air inlet connecting seat has all fixedly cup jointed an above-mentioned intake pipe, and this intake pipe communicates with jet fan through this air inlet connecting seat.

Further improved, two, three, four or six air inlet connecting seats are uniformly distributed on the circumferential side wall of the jet fan.

In a further improvement mode, the air inlet pipe is arranged along the left side and/or the right side of the carrier vehicle, and the air inlet end of the air inlet pipe extends to the bottom edge of the front end face of the vehicle head in a mode of avoiding the influence of the visual field; the jet fan fixing frame is arranged at the top of the vehicle head.

In a further improvement, the jet direction of the jet fan forms an included angle of 28-63 degrees with the horizontal plane; the rear end of the jet fan is rotatably assembled on the head of the carrier loader through a fixed seat fixed shaft, the front end of the jet fan is provided with a hydraulic oil cylinder, and the hydraulic oil cylinder is used for driving the front end of the jet fan to move up and down.

Further improved, a support frame is fixedly arranged on a bearing part of the carrying vehicle, and the jet fan is fixedly assembled on the support frame.

In a further improvement, the spiral pipeline of the quick cooling grid is arranged between spiral gaps projected along the jet flow direction by the pre-cooling grid.

Further improve ground, be equipped with the cold source pond in the above-mentioned closed freezer, the one end of cold source pond neighbouring above-mentioned efflux fan is located to above-mentioned heat exchanger, and closed freezer is equipped with the cold source feed inlet, and the one end that this efflux fan was kept away from in this cold source pond is located to the cold source feed inlet.

In a further improved mode, the bottom of the cold source pool is downwards inclined and extends from one end where the cold source feeding hole is located to one end where the heat exchanger is located.

In a further improvement, the heat exchanger is formed by a single pipe body which is formed by winding along the inner wall of the closed freezer, and the cross section of the pipe body is of a rectangular structure of 35-55 mm multiplied by 9-15 mm.

In a further improvement mode, the cross sections of the pipelines of the quick cooling grids and the pre-cooling grids are both in a rectangular structure of 105-225 mm multiplied by 3-5 mm, the thread pitches of the quick cooling grids are both 30-55 mm, and the thread pitches of the pre-cooling grids are both 42-58 mm.

In a further improvement, the liquid inlet end of the quick cooling grid is arranged at the center of the spiral structure, and the liquid outlet end of the pre-cooling grid is arranged at the center of the spiral structure.

From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages: the cooling vehicle is simple in structure and convenient to move; this intake pipe can absorb the hot-air of comparatively low-lying department in the tunnel and tangent line jettison jet channel and form rotatory air current, make hot-air advance forward along spiral path in jet channel, the flow stroke of air in jet channel has both been prolonged effectively, the effective stirring misce bene of air has also been promoted, be favorable to even and comprehensive the giving of heat of hot-air cooling bars and high-efficient cooling, the cold air directive eminence that obtains, because cold air density is great and flow downwards, and then drive hot-air downwards and have certain compression effect and make hot-air flow towards low-lying department to hot-air, and the air inlet end of air-supply line then can inhale hot-air more high-efficiently, thereby form cold, hot-air's heat transfer circulation, make the tunnel cooling effect obtain obviously improving.

In addition, through the spiral plane's disjunctor structure setting of the precooling bars of cooling grid and fast cooling bars, can carry out high-efficient low wetland to the high temperature air who gets into the construction environment of efflux fan and carry out precooling, fast cold treatment, the spiral flow air that forms in the efflux passageway can be even, high-efficient and give the cooling grid with heat transfer comprehensively to obtain the low humid cold wind that the temperature is lower, thereby provide more efficient cooling function to the tunnel construction environment. In addition, the cooling vehicle has the advantages of convenient operation, low cost and high success rate, the air cooled by the jet fan is not sprayed, the original humidity of the construction environment is kept without generating liquid fog, the cooling speed is high in the space range of 3-14 meters taking the device as the center, the cooling effect is obvious, a proper construction environment meeting the standard can be rapidly and continuously provided, the high-temperature tunnel is efficiently cooled without generating liquid fog, the construction efficiency is improved, and the cooling vehicle can be widely applied to the construction cooling in the high-temperature tunnel of railways, highways, municipal works and liquid mines.

Drawings

Fig. 1 is a schematic right-view structural diagram of the cooling vehicle of the present invention.

Fig. 2 is a schematic front view of a cooling grid according to the present invention and a partially enlarged view thereof.

Fig. 3 is a schematic view of a connection structure of an air inlet end and an air inlet pipe of the jet fan.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

Referring to fig. 1 and 2, the tunnel cooling vehicle of the embodiment includes a carrying vehicle 1, and a jet fan 2, a cooling grid 3, a liquid outlet pipe 4, a liquid return pipe 5, a circulating pump 6, a heat exchanger 7, and a closed freezer 8 which are assembled on the carrying vehicle 1.

Referring to fig. 1 and 3, at least one air inlet pipe 22 is connected to a circumferential side wall of an air inlet end of the jet fan 2, and preferably, the air inlet pipe 22 is a corrugated pipe capable of freely stretching and bending. The circumferential side wall of the jet fan 2 is fixedly provided with an air inlet connecting seat 23, and the air inlet pipe 22 is communicated with the jet fan 2 through the air inlet connecting seat 23. Preferably, one (as shown in fig. 1), two, three (as shown in fig. 3), four or six air inlet connecting seats 23 are uniformly distributed on the circumferential side wall of the jet fan 2, and the air inlet end of each air inlet connecting seat 23 is fixedly sleeved with one air inlet pipe 22. The air inlet end of the air inlet pipe 22 inclines towards the low position of the tunnel, and the air outlet end of the air inlet pipe 22 inputs air to the jet flow channel of the jet flow fan 2 along the tangential direction of the cross section of the corresponding position of the jet flow fan 2; tunnel air is drawn in by this air inlet duct 22 and is inclined towards the tunnel high level under the drive of the jet fan 2.

With continued reference to fig. 1, the air intake duct 22 is preferably disposed along the left side and/or the right side of the vehicle 1, and an air intake end of the air intake duct 22 extends to a bottom edge of a front end surface of the vehicle head 11, for example, extends along an outer side of a load-bearing framework (such as a roof, an a-pillar, etc.) of the vehicle head 11 to avoid the influence of a visual field; the fixed mount of the jet fan 2 is arranged at the top of the head 11. A support frame 12 is fixedly arranged on a bearing part (such as a rear car hopper, a bearing longitudinal beam and the like) of the carrier loader 1, and the jet fan 2 is fixedly assembled on the support frame 12. Or, the framework of the vehicle head 11 is reinforced to the required structural strength, and then the jet flow fan 2 is directly fixed and assembled on the vehicle top of the vehicle head 11.

Referring to fig. 1 and 2, the cooling grid 3 includes a pre-cooling grid 31 and a fast cooling grid 32, both the pre-cooling grid 31 and the fast cooling grid 32 are formed by spirally bending a single pipeline to form a spiral structure as shown in fig. 2, and a liquid outlet end of the fast cooling grid 32 is communicated and fixedly connected with a liquid inlet end of the pre-cooling grid 31 into a whole.

With reference to fig. 1, an air blowing mechanism 21 is disposed in the jet flow fan 2, and the air blowing mechanism 21, the fast cooling grate 32, and the pre-cooling grate 31 are fixedly mounted in the jet flow channel of the jet flow fan 2 in a front-to-back sequential arrangement along the jet flow direction. The air is driven by the jet flow fan 2 to pass through the pre-cooling grid 31, the fast cooling grid 32 and the jet flow fan 2 in sequence and then is obliquely emitted to the high position of the tunnel. Preferably, the spiral duct of the fast cooling grid 32 is arranged between spiral gaps projected along the jet flow direction by the pre-cooling grid 31; this structure setting has effectual redirecting and water conservancy diversion effect to the flow direction of the air through precooling bars 31 and fast cooling bars 32 for the air forms the whirl effect of certain degree, is favorable to improving the cooling efficiency of air.

With reference to fig. 1, the heat exchanger 7 is disposed in the closed refrigerator 8, and the closed refrigerator 8 is filled with a cold source, which is preferably an ice block that is easy to prepare and low in cost; the heat exchange liquid circulating is preferably conventional antifreeze liquid, so that the heat exchange liquid can avoid blockage caused by low-temperature icing when flowing in the closed refrigerator 8. The liquid outlet end of the heat exchanger 7, the circulating pump 6 and the liquid inlet end of the quick cooling grid 32 are sequentially communicated through the liquid outlet pipe 4, and the liquid outlet end of the pre-cooling grid 31 is communicated with the liquid inlet end of the heat exchanger 7 through the liquid return pipe 5.

Continuing to refer to fig. 1, a cold source tank 80 is arranged in the closed refrigerator 8, the heat exchanger 7 is arranged at one end of the cold source tank 80 close to the jet fan 2, a cold source feed port 81 is arranged in the closed refrigerator 8, and the cold source feed port 81 is arranged at one end of the cold source tank 80 far away from the jet fan 2. The bottom of the cold source tank 80 preferably extends downwards from the end where the cold source feed port 81 is located to the end where the heat exchanger 7 is located, as shown in fig. 1; this slope sets up, and what had been favorable to the cold source to be added by feed inlet 81 can be automatic moves to heat exchanger 7 one end, also makes the focus of this cooling car shift to central direction, is favorable to the delivery of cooling car more steady.

With reference to fig. 1, the circulating pump 6 drives the heat exchange liquid to flow in a continuous unidirectional circulation manner along the liquid outlet end of the heat exchanger 7, the liquid outlet pipe 4, the circulating pump 6, the liquid outlet pipe 4, the liquid inlet end 321 of the rapid cooling grid 32, the pre-cooling grid 31, the liquid outlet end 311 of the pre-cooling grid 31, the liquid return pipe 5, the liquid inlet end of the heat exchanger 7, and the interior of the heat exchanger 7. The flow direction of the heat exchange liquid is shown as the solid arrows in fig. 1 and 2. While the heat-exchange fluid may be configured as readily available and inexpensive water, the continuous circulation flow arrangement is effective to reduce the probability of water being frozen into ice as it flows within the enclosed cooler 8.

With reference to fig. 1, the jet direction of the jet fan 2 forms an angle of 28-63 degrees with the horizontal plane. The rear end of the jet fan 2 is rotatably assembled on the carrier loader 1 through a fixed seat fixed shaft, the front end of the jet fan 2 is provided with a hydraulic oil cylinder 9, and the hydraulic oil cylinder 9 is used for driving the front end of the jet fan 2 to move up and down. The jet angle of the jet fan 2 can be adjusted according to construction environment and conditions, so that the applicability of construction environment and actual cooling requirements of a cooling fleet is well improved.

With reference to fig. 1, the heat exchanger 7 is formed by a single pipe body which is formed by winding along the inner wall of the closed freezer 8, and the cross section of the pipe body is in a rectangular structure of 35 to 55mm × 9 to 15 mm. The cross sections of the pipelines of the quick cooling grids 32 and the pre-cooling grids 31 are both rectangular structures with the diameters of 105-225 mm multiplied by 3-5 mm, the thread pitches of the quick cooling grids 32 are both 30-55 mm, and the thread pitches of the pre-cooling grids 31 are both 42-58 mm. The liquid inlet end of the quick cooling grid 32 is arranged at the center of the spiral structure, and the liquid outlet end of the pre-cooling grid 31 is arranged at the center of the spiral structure. The temperature at the center of the fast cooling grid 32 is lower, so that the air passing through the center and concentrated more can be subjected to efficient heat exchange, and the heat exchange efficiency is improved. The cross section of the pipeline is of a rectangular structure with the size of 105-225 mm multiplied by 3-5 mm, and preferably, the size of the cross section is 105mm multiplied by 3mm, 105mm multiplied by 5mm, 165mm multiplied by 3mm or 225mm multiplied by 3 mm. The heat exchanger 7 is formed by a single pipe body which is formed by winding along the inner wall of the closed freezer 8, the cross section of the flow passage of the pipe body is in a rectangular structure of 35-55 mm × 9-15 mm, and the cross section size of the fast cooling grid 32 pipeline are preferably 35 × 9mm, 35mm × 15mm, 55mm × 9mm or 55mm × 15mm in one-to-one correspondence. This quick cold bars 32's helical structure sets up makes it make easily, and the setting of the screw thread interval of flat cross section and small interval has improved the area of contact of air with quick cold bars 32, effectively improves the cooling efficiency of air for the air temperature through quick cold bars 32 is lower, effectively improves the device's cooling efficiency.

With continued reference to fig. 1 to 3, the cooling vehicle of the invention has simple structure and convenient movement; this admit air, 22 can absorb the hot-air of comparatively low-lying department in the tunnel and tangent line jettison jet channel and form rotatory air current, make hot-air impel forward along spiral path in jet channel, the flow stroke of air in jet channel has both been prolonged effectively, the effective stirring misce bene of air has also been promoted, be favorable to even and comprehensive the giving of heat of hot-air cooling grid and high-efficient cooling, the cold air directive eminence that obtains, because cold air density is great and flow downwards, and then drive hot-air downwards and have certain compression effect and make hot-air flow towards low-lying department to hot-air, and the air inlet end of air-supply line then can inhale hot-air more high-efficiently, thereby form cold, hot-air's heat transfer circulation, make the tunnel cooling effect obtain obviously improving.

In addition, through the spiral plane's of the precooling bars 31 of cooling grid 3 and fast cooling bars 32 disjunctor structure setting, can carry out high-efficient low wetland to the high temperature air who gets into the construction environment of jet fan 2 and carry out precooling, fast cold treatment, the spiral air that flows that forms in the jet flow passageway can be even, high-efficient and give cooling grid 3 with heat transfer comprehensively to obtain the low humid cold wind that the temperature is lower, thereby provide more efficient cooling function to the tunnel construction environment. In addition, this cooling car still has the simple operation, and is with low costs, and the success rate is high, through the air cooling after the jet fan 2 jet cooling, do not produce the liquid fog and keep the original humidity of construction environment, the cooling rate is fast in the space range of 3 ~ 14 meters of the device as the center, the cooling effect is obvious, can provide a suitable construction environment that accords with the standard fast and continuously, can realize that high temperature tunnel does not produce the liquid fog and carry out high-efficient cooling, construction efficiency has been improved, can extensively be used for railway, highway, municipal administration, liquid profit, the interior construction cooling in the hole of mine engineering high temperature tunnel.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims

1. A tunnel cooling vehicle comprises a carrying vehicle, and a jet fan, a cooling grid, a liquid outlet pipe, a liquid return pipe, a circulating pump, a heat exchanger and a closed refrigerator which are assembled on the carrying vehicle; the method is characterized in that:

the circumferential side wall of the air inlet end of the jet flow fan is connected with at least one air inlet pipe, the air inlet end of the air inlet pipe inclines towards the lower position of the tunnel, and the air outlet end of the air inlet pipe inputs air to the jet flow channel of the jet flow fan along the tangential direction; the air in the tunnel is sucked by the air inlet pipe and is obliquely emitted to the high position of the tunnel under the driving of the jet fan;

the cooling grid comprises a pre-cooling grid and a quick-cooling grid, the pre-cooling grid and the quick-cooling grid are both of spiral structures formed by spirally bending a single pipeline, and the liquid outlet end of the quick-cooling grid is communicated and fixedly connected with the liquid inlet end of the pre-cooling grid into a whole; the jet flow fan is internally provided with an air blast mechanism, and the air blast mechanism, the quick cooling grid and the pre-cooling grid are fixedly arranged in a jet flow channel of the jet flow fan in a front-back sequential arrangement manner along the jet flow direction;

the heat exchanger is arranged in the closed refrigerator, and a cold source is filled in the closed refrigerator; the circulating pump drives the heat exchange liquid to continuously flow in a unidirectional circulation manner along the liquid outlet end of the heat exchanger, the liquid outlet pipe, the circulating pump, the liquid outlet pipe, the quick cooling grid, the precooling grid, the liquid return pipe, the liquid inlet end of the heat exchanger and the interior of the heat exchanger.

2. The tunnel cooling vehicle of claim 1, wherein: the air inlet pipe is a corrugated pipe which can be freely stretched and bent.

3. A tunnel cooling vehicle as claimed in claim 2, characterized in that: the jet fan is characterized in that an air inlet connecting seat is fixedly assembled on the circumferential side wall of the jet fan, one air inlet end part of each air inlet connecting seat is fixedly sleeved with an air inlet pipe, and the air inlet pipe is communicated with the jet fan through the air inlet connecting seats.

4. A tunnel cooling vehicle as claimed in claim 3, characterized in that: two, three, four or six air inlet connecting seats are uniformly distributed on the circumferential side wall of the jet fan.

5. The tunnel cooling vehicle of claim 1, wherein: the air inlet pipe is arranged along the left side and/or the right side of the carrier loader, and the air inlet end of the air inlet pipe extends to the bottom edge of the front end face of the vehicle head in a manner of avoiding the influence of the visual field; the jet fan fixing frame is arranged at the top of the vehicle head.

6. A tunnel cooling car of claim 5, characterized in that: the jet direction of the jet fan forms an included angle of 28-63 degrees with the horizontal plane; the rear end of the jet flow fan is rotatably assembled on the head of the carrier loader through a fixed seat fixed shaft, the front end of the jet flow fan is provided with a hydraulic oil cylinder, and the hydraulic oil cylinder is used for driving the front end of the jet flow fan to move up and down.

7. A tunnel cooling car as claimed in claim 5 or 6, wherein: and a support frame is fixedly arranged on a bearing part of the carrier loader, and the jet fan is fixedly assembled on the support frame.

8. A tunnel cooling car of any one of claims 2 to 6, characterized in that: the spiral pipeline of the quick cooling grid is arranged between spiral gaps projected by the pre-cooling grid along the jet flow direction; the liquid inlet end of the quick cooling grid is arranged at the center of the spiral structure, and the liquid outlet end of the pre-cooling grid is arranged at the center of the spiral structure.

9. The tunnel cooling vehicle of claim 8, wherein: the cross sections of the fast cooling grids and the cross sections of the pipelines of the pre-cooling grids are both in a rectangular structure of 105-225 mm multiplied by 3-5 mm, the thread intervals of the fast cooling grids are both 30-55 mm, and the thread intervals of the pre-cooling grids are both 42-58 mm.

10. A tunnel cooling car of any one of claims 1 to 6, characterized in that: the closed refrigerator is provided with a cold source pool, the heat exchanger is arranged at one end of the cold source pool close to the jet flow fan, the closed refrigerator is provided with a cold source feed port, and the cold source feed port is arranged at one end of the cold source pool far away from the jet flow fan; the cold source pool bottom is inclined downwards and extends from one end where the cold source feed inlet is located to one end where the heat exchanger is located.