阅读说明：本技术 一种船舶用泵辅助冷却系统 (Auxiliary cooling system for pump for ship ) 是由 李磊 杜度 陈科 毛柳伟 刘志春 诸宇浩 于 2021-09-27 设计创作，主要内容包括：本发明属于热管冷却系统领域,并具体公开了一种船舶用泵辅助冷却系统,其包括蒸发器、冷凝器和回转泵,其中：所述蒸发器的集汽腔通过蒸汽管道与冷凝器连接,蒸发器的集液腔通过冷凝回流管道与冷凝器连接,且所述冷凝器的安装位置高于所述蒸发器；所述冷凝回流管道上设置有储液器和引射器,该储液器和引射器通过所述回转泵连通,并共同构成辅助回路。本发明通过改变齿轮泵的输入电压调整制冷工质的流量可实现系统的主动控温,解决传统分离式热管无法调控温度的问题,同时提高冷却系统主回路流体质量流量,保证船舶运行中系统启动和运行的稳定性,并达到降低能耗的目标。(The invention belongs to the field of heat pipe cooling systems, and particularly discloses a pump auxiliary cooling system for a ship, which comprises an evaporator, a condenser and a rotary pump, wherein: the steam collection cavity of the evaporator is connected with the condenser through a steam pipeline, the liquid collection cavity of the evaporator is connected with the condenser through a condensation backflow pipeline, and the installation position of the condenser is higher than that of the evaporator; and a liquid storage device and an ejector are arranged on the condensation backflow pipeline, and the liquid storage device and the ejector are communicated through the rotary pump and jointly form an auxiliary loop. The invention can realize the active temperature control of the system by changing the input voltage of the gear pump to adjust the flow of the refrigeration working medium, solves the problem that the traditional separated heat pipe can not regulate and control the temperature, simultaneously improves the mass flow of the fluid in the main loop of the cooling system, ensures the stability of the system starting and running in the ship running and achieves the aim of reducing the energy consumption.)

1. Pump-assisted cooling system for ships, characterized by comprising an evaporator (12), a condenser (11) and a rotary pump (14), wherein:

the steam collection cavity (1) of the evaporator (12) is connected with the condenser (11) through a steam pipeline (7), the liquid collection cavity (2) of the evaporator (12) is connected with the condenser (11) through a condensation reflux pipeline (6), and the installation position of the condenser (11) is higher than that of the evaporator (12); and a liquid storage device (13) and an ejector (5) are arranged on the condensation backflow pipeline (6), and the liquid storage device (13) and the ejector (5) are communicated through the rotary pump (14) and jointly form an auxiliary loop.

2. Pump-assisted cooling system for ships according to claim 1, characterized in that the evaporator (12) comprises a vapor collection chamber (1), a liquid collection chamber (2), a vapor duct (3) and a baffle grid, wherein: the steam collecting cavity (1), the steam pipeline (3) and the liquid collecting cavity (2) are sequentially communicated and arranged, and the baffling grid is used for fixing the steam pipeline (3).

3. The auxiliary cooling system for a marine pump as defined in claim 2, wherein the inner wall of the steam pipe (3) is provided with a plurality of dovetail grooves along the circumferential direction.

4. The auxiliary cooling system for a marine pump according to claim 3, wherein each of the dovetail grooves has a width of 0.2mm to 1mm, and a distance between two adjacent dovetail grooves is not less than 0.5 mm.

5. The heat pipe evaporator as set forth in claim 3, wherein said dovetail groove is provided at a bottom thereof with a plurality of saw teeth.

6. The pump-assisted cooling system for a ship according to claim 5, wherein each of the serrations has a width of 30 μm to 80 μm.

7. The auxiliary cooling system of marine pump according to claim 2, wherein the baffle grid comprises a fixing member and a plurality of wave-shaped baffle rods (4) installed in the fixing member, the plurality of wave-shaped baffle rods (4) are arranged in parallel, and the wave-shaped concave-convex positions of adjacent wave-shaped baffle rods (4) are arranged in a staggered manner; the steam pipeline (3) is arranged in a wave-shaped gap between the wave-shaped baffle rods (4), so that triangular pipe distribution of the steam pipeline (3) is realized.

8. Marine pump auxiliary cooling system according to claim 7, characterised in that the wave-shaped baffle rod (4) is oval.

9. Pump auxiliary cooling system for ships according to claim 1, characterized in that the rotary pump (14) is a gear pump.

10. Marine pump auxiliary cooling system according to any one of claims 1-9, characterised in that a side valve (8) is mounted on each of the condensate return line (6) and the steam line (7), and the side valve (8) is located close to the side of the condenser (11).

Technical Field

The invention belongs to the field of heat pipe cooling systems, and particularly relates to an auxiliary cooling system for a pump for a ship.

Background

The traditional air cooling device used on the ship is generally a water chilling unit, air is cooled by cold water flowing through the finned tubes, and a water pump and a fan with high power are additionally added to obtain a good heat dissipation effect, so that the energy consumption is high, and the self-sustaining capacity of the ship is reduced.

In recent years, heat pipe technology has been applied to various fields such as cooling of high-heat-flow electronic devices and thermal control of spacecraft due to its advantages such as good heat exchange performance and reliability. The separated heat pipe is used as a passive heat exchange system evolved from a heat pipe heat exchanger, and due to the characteristics of flexible arrangement, long-distance heat transportation and the like, the heat exchange between the inside of the cabin and the outboard seawater can be realized by arranging the condenser outside the cabin theoretically. However, the conventional heat pipe evaporator has poor heat exchange performance, and meanwhile, the separate heat pipe system also depends on heat exchange between the condenser and seawater, so that the requirement of the refrigeration capacity of the ship cannot be met due to insufficient heat dissipation of the condenser under the condition that the ship runs at a low speed or is static, and even the starting failure of the separate heat pipe may be caused. Meanwhile, the inability to regulate temperature is one of the drawbacks of the conventional split heat pipe, and thus is difficult to apply to an air conditioning system of a ship.

In addition, the traditional heat pipe evaporator is generally in a shell-and-tube structure, adopts a smooth round pipe with fins, is simple to process, but has less vaporization cores on the smooth surface and difficult nucleation in the evaporation process, so that the heat exchange performance is not ideal enough, and the evaporator is used for a separated heat pipe to difficultly meet the refrigerating capacity requirement in the running process of a ship.

Disclosure of Invention

Aiming at the defects or the improvement requirements of the prior art, the invention provides an auxiliary cooling system of a pump for a ship, which aims to solve the problem that the traditional separated heat pipe cannot regulate and control the temperature, improve the mass flow of the fluid in a main loop of the cooling system and ensure the starting and running stability of the system in the running process of the ship.

In order to achieve the above object, the present invention provides a pump auxiliary cooling system for a ship, comprising an evaporator, a condenser and a rotary pump, wherein:

the steam collection cavity of the evaporator is connected with the condenser through a steam pipeline, the liquid collection cavity of the evaporator is connected with the condenser through a condensation backflow pipeline, and the installation position of the condenser is higher than that of the evaporator; and a liquid storage device and an ejector are arranged on the condensation backflow pipeline, and the liquid storage device and the ejector are communicated through the rotary pump and jointly form an auxiliary loop.

As a further preferred, the evaporator comprises a vapor collection chamber, a liquid collection chamber, a vapor conduit and a baffle grid, wherein: the steam collecting cavity, the steam pipeline and the liquid collecting cavity are sequentially communicated and arranged, and the baffling grid is used for fixing the steam pipeline.

Preferably, the inner wall of the steam pipeline is provided with a plurality of dovetail grooves along the circumferential direction.

More preferably, the width of each dovetail groove is 0.2 mm-1 mm, and the distance between two adjacent dovetail grooves is not less than 0.5 mm.

Preferably, the bottom of the dovetail groove is provided with a plurality of saw teeth.

More preferably, each of the serrations has a width of 30 to 80 μm.

Preferably, the baffle grid comprises a fixed part and a plurality of wave-shaped baffle rods arranged in the fixed part, the wave-shaped baffle rods are arranged in parallel, and the wave concave-convex positions of adjacent wave-shaped baffle rods are arranged in a staggered manner; the steam pipeline is arranged in the wavy gaps among the wavy baffle rods, so that triangular pipe distribution of the steam pipeline is realized.

As a further preference, the wave-shaped baffle rod is oval.

More preferably, the rotary pump is a gear pump.

Preferably, the condensing and returning pipeline and the steam pipeline are both provided with side valves, and the side valves are close to the side of the condenser.

Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:

1. according to the pump auxiliary cooling system provided by the invention, the rotary pump is arranged in the auxiliary loop, the active temperature control of the system can be realized by adjusting the circulation volume of the refrigeration working medium by changing the input voltage of the rotary pump, and the auxiliary loop is used for injecting the main loop working medium in combination with the introduction of the injector, so that the mass flow of the main loop fluid can be effectively improved, and the running performance of the system is further improved.

2. When the pump auxiliary cooling system operates, the gravity potential difference between the condenser and the evaporator is main circulating power, and the advantages of the active and passive heat dissipation systems are combined by additionally arranging a pump-driven loop as auxiliary driving force, so that compared with the traditional refrigerant water system, the energy consumption required by the system operation is reduced; meanwhile, the normal starting and stable operation of the separated heat pipe can be ensured when the ship sails at low speed.

3. The dovetail-shaped micro-channel is arranged in the steam pipeline, is equivalent to a group of micro-heat pipe arrays, and is further modified with a micron-sized sawtooth structure in the channel, so that the micro-channel has higher heat exchange performance. Specifically, along with the phase change of the refrigerant in the pipe, the evaporation core on the inner surface of the pipeline can be increased, and meanwhile, the sharp-angled area or the micro-groove channel generates the axial capillary pressure difference, so that additional surface tension is provided to assist the gravity to maintain the circulation of the separated heat pipe, and no movable part is arranged, so that the separated heat pipe has the advantages of convenience in processing and no maintenance; considering the structural strength and reliability of the pipeline, the distance between the two channels is not less than 0.5 mm.

4. Traditional baffling rod heat exchanger adopts the round straight rod to support the heat exchange tube, is subject to the requirement of heat transfer volume and compact structure nature, and the heat exchange tube interval often is less, and this makes baffling rod cloth pole space less, and consequently the triangle cloth pipe mode commonly used is difficult to be used in the baffling rod heat exchanger. The steam pipeline is positioned by adopting the adjacent corrugated rods, and the steam pipeline can be supported by only one baffle grid; meanwhile, the wave-shaped baffle rod can enable fluid to form turbulent flow when flowing through, and compared with a straight rod, the wave-shaped baffle rod has a better mixed flow temperature equalizing effect, namely the temperature distribution of the cross section is more uniform, so that the evaporator has more efficient heat exchange performance.

5. The wave concave-convex positions of the adjacent wave-shaped deflection rods of the shell pass part of the evaporator are arranged in a staggered mode, so that triangular pipe distribution of the steam pipeline between the wave-shaped deflection rods is realized, and the space utilization rate is higher compared with a square pipe distribution mode; and further, the number of shell pass distribution pipes can be increased in the same space, so that the heat exchange area between the hot fluid and the pipeline is increased. The structure solves the problem that a triangular pipe distribution mode is difficult to apply in the baffle rod heat exchanger, and improves the compactness of the heat exchanger.

6. The cross section of the corrugated baffle rod is preferably oval, and compared with a common round section rod, the oval section rod has better temperature uniformity of a fluid temperature field and stronger convection heat exchange performance, and the requirement on refrigerating capacity in the running process of a ship is better met.

Drawings

FIG. 1 (a) and (b) are schematic structural diagrams of a heat pipe evaporator according to an embodiment of the present invention;

FIG. 2 is a schematic view of the arrangement of the steam pipes and the corrugated baffle rods according to the embodiment of the present invention;

FIGS. 3 (a) and (b) are schematic views of dovetail-shaped grooves and saw teeth structures according to embodiments of the present invention;

FIG. 4 is a schematic view of a corrugated rod baffle according to an embodiment of the present invention;

FIGS. 5 (a) and (b) are schematic cross-sectional views of circular and elliptical corrugated rods according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a marine pump auxiliary cooling system according to an embodiment of the present invention.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-a steam collecting cavity, 2-a liquid collecting cavity, 3-a steam pipeline, 4-a wave-shaped baffle rod, 5-an ejector, 6-a condensation reflux pipeline, 7-a steam pipeline, 8-a side valve, 11-a condenser, 12-an evaporator, 13-a liquid storage device and 14-a rotary pump.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

An auxiliary cooling system for a marine pump, as shown in fig. 6, includes an evaporator 12, a condenser 11, a reservoir 13, a rotary pump 14, an ejector 5, a condensing return pipe 6, a steam pipe 7, and a side valve 8, where:

the steam collecting cavity 1 of the evaporator 12 is connected with the condenser 11 through a steam pipeline 7, the liquid collecting cavity 2 of the evaporator 12 is connected with the condenser 11 through a condensation backflow pipeline 6, and the condenser 11 is arranged outside the cabin and is higher than the evaporator 12; the condensation return pipeline 6 is divided into a main loop and an auxiliary loop provided with a rotary pump 14 from a liquid storage device 13 and is recombined through the ejector 5, wherein the rotary pump 14 is preferably a gear pump; the top of the liquid storage device 13 is provided with a filling port, two openings at the bottom are respectively connected with the main loop and the auxiliary loop, and the volume of the liquid storage device depends on the volume of the internal pipeline and the part of the loop and the working medium filling rate of the loop; shutters are arranged on two sides of the evaporator shell and are used as an inlet and an outlet of air; the side valve 8 is provided on the condensate return pipe 6 and the steam pipe 7 at a position close to the condenser 11 side.

Specifically, the evaporator 12 includes a vapor collecting chamber 1, a liquid collecting chamber 2, a vapor pipe 3 and a baffle grid, as shown in fig. 1, wherein:

steam collecting chamber 1, steam conduit 3, the setting of liquid collecting chamber 2 intercommunication in proper order, the baffling bars can be a plurality of, and every baffling bar includes annular fixed part and installs many wave form baffling rods 4 in the fixed part, steam conduit 3 installs in the wave clearance between wave form baffling rod 4, as shown in figure 2.

Further, as shown in fig. 4, a plurality of wave-shaped baffle rods 4 are arranged in parallel, and wave concave-convex positions of adjacent wave-shaped baffle rods 4 are arranged in a staggered manner, so that triangular pipe distribution of the steam pipeline 3 is realized, the number of shell-side pipe distribution, the heat exchange area and the area of a turbulent flow region are increased, and the compactness of the heat exchanger is improved. The wave-shaped baffle rods 4 are round or oval, preferably oval, as shown in fig. 5, the oval-shaped cross-section rods have better temperature uniformity of fluid temperature field and stronger convection heat exchange performance.

Further, as shown in fig. 3, a plurality of dovetail-shaped grooves are formed in the inner wall of the steam pipe 3 along the circumferential direction, and a plurality of micron-sized saw teeth are arranged at the bottoms of the dovetail-shaped grooves; specifically, for a nickel cupronickel B10 pipe with the diameter of 8mm, the structural size of the dovetail-shaped channel is 0.3mm multiplied by 0.5mm, and 20 dovetail-shaped channels are arranged. The micron-sized saw teeth in the dovetail-shaped grooves use rectangular saw teeth, and the size of the rectangular saw teeth is 50 micrometers multiplied by 50 micrometers. It should be noted that, considering the structural strength and reliability of the pipe, the distance between the two channels should be no less than 0.5mm, and the aspect ratio and number of the channels can be adjusted according to the capillary limit and the boiling limit. The capillary force of the channel is provided by the difference of the curvatures of the vapor-liquid two-phase interface along the direction of the pipeline, when the system works, the refrigeration working medium in the vapor pipeline is subjected to phase change, the curvature of the meniscus in the channel on the upper side of the pipeline is increased, and the provided capillary force drives the refrigeration working medium to be continuously supplemented to the heat pipe pipeline.

In the aspect of processing, the evaporator adopts a tube type heat exchanger, and in order to ensure that no leakage occurs between the working medium pipeline and the tube plate, the connection is carried out by adopting a method of strength expansion and seal welding so as to ensure the connection to be safe, reliable and free from leakage. The working medium pipeline adopts an argon arc welding all-welded structure, and the leakage rate is detected to be 5 x 10 through helium mass spectrum strict leakage detection^-9Pa, ensuring the sealing performance.

When the system works, equipment water to be cooled enters the shell side of the evaporator 12 to exchange heat with the steam pipeline 3, a refrigerant in the heat pipe is heated and then changes into a gas phase to rise to the steam collecting cavity 1, and enters the condenser 11 along the steam pipeline 7 to be cooled by seawater. The condensed refrigerant enters the liquid storage device 13 along the condensation return pipeline 6 under the action of gravity. According to the running condition of the ship, the rotary pump 14 is closed during high-speed navigation, and the refrigeration working medium returns to the liquid collecting cavity 2 of the evaporator from the main loop; and (3) opening the rotary pump 14 during low-speed navigation, adjusting the flow of the working medium by adjusting the input power of the rotary pump 14, enabling the working medium to respectively enter the main loop and the auxiliary loop, converging at the ejector 5 and finally returning to the liquid collecting cavity 2 of the evaporator. The auxiliary cooling system for the ship pump provided by the invention can solve the problem that the traditional separated heat pipe cannot regulate and control the temperature, and can enhance the starting and running stability of the system under the ship running condition and achieve the aim of reducing energy consumption.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.