CN113716011B - Auxiliary cooling system for pump for ship - Google Patents
Auxiliary cooling system for pump for ship Download PDFInfo
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- CN113716011B CN113716011B CN202111135368.5A CN202111135368A CN113716011B CN 113716011 B CN113716011 B CN 113716011B CN 202111135368 A CN202111135368 A CN 202111135368A CN 113716011 B CN113716011 B CN 113716011B
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- 238000001816 cooling Methods 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000009833 condensation Methods 0.000 claims abstract description 8
- 230000005494 condensation Effects 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims abstract description 3
- 238000010992 reflux Methods 0.000 claims abstract 3
- 239000012530 fluid Substances 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000005057 refrigeration Methods 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
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- 230000017525 heat dissipation Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
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- MBBJRYMYJFHIPG-UHFFFAOYSA-N [Ni].[Ni].[Ni].[Cu] Chemical compound [Ni].[Ni].[Ni].[Cu] MBBJRYMYJFHIPG-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/12—Heating; Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/043—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure forming loops, e.g. capillary pumped loops
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- General Engineering & Computer Science (AREA)
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- Ocean & Marine Engineering (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
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 specifically discloses a pump auxiliary cooling system for ships, which comprises an evaporator, a condenser and a rotary pump, wherein: a steam collecting chamber of the evaporator is connected to the condenser through a steam pipe, The liquid collecting chamber of the evaporator is connected to the condenser through a condensation reflux pipeline, and the installation position of the condenser is higher than the evaporator; a liquid storage device and an ejector are arranged on the condensation reflux pipeline, and the liquid storage device It communicates with the ejector through the rotary pump and forms an auxiliary circuit together. The invention can realize the active temperature control of the system by changing the input voltage of the gear pump to adjust the flow rate of the refrigeration working medium, solve the problem that the temperature cannot be controlled by the traditional separate heat pipe, and at the same time improve the mass flow rate of the fluid in the main circuit of the cooling system, so as to ensure the startup of the system during the operation of the ship. and operation stability, and achieve the goal of reducing energy consumption.
Description
技术领域technical field
本发明属于热管冷却系统领域,更具体地,涉及一种船舶用泵辅助冷却系统。The invention belongs to the field of heat pipe cooling systems, and more specifically relates to a pump auxiliary cooling system for ships.
背景技术Background technique
船舶上所使用的传统空气冷却装置一般为冷水机组,通过冷水流经翅片管对空气进行冷却,这需要外加高功率的水泵及风机以获得较好的散热效果,因而能源消耗较大,船舶的自持力下降。The traditional air cooling devices used on ships are generally water chillers, which cool the air through cold water flowing through finned tubes, which requires additional high-power water pumps and fans to obtain better heat dissipation effects, so energy consumption is large, and ships decreased self-sustainability.
近年来,热管技术因其较好的换热性能及可靠性等优点被应用于高热流电子器件冷却、航天器热控制等各个领域。分离式热管作为一种由热管换热器演变而来的被动式的换热系统,因其布置灵活且可实现远距离热量运输等特点,理论上可以通过将冷凝器设置于舷外的方式可以实现舱内与舷外海水的热交换。但是,传统的热管蒸发器换热性能较差,同时分离式热管系统还依赖于冷凝器与海水的换热,在船舶低速行驶或静止的情况下冷凝器的不充分散热将无法满足船舶制冷量的需求,甚至可能导致分离式热管的启动失败。同时,无法调节温度也是传统分离式热管的弊端之一,因此难以应用于船舶的空调系统中。In recent years, heat pipe technology has been used in various fields such as cooling of high heat flux electronic devices and thermal control of spacecraft due to its good heat transfer performance and reliability. As a passive heat exchange system evolved from a heat pipe heat exchanger, the separated heat pipe can theoretically be realized by placing the condenser outside the ship because of its flexible layout and the ability to realize long-distance heat transport. Heat exchange between inboard and outboard seawater. However, the heat transfer performance of the traditional heat pipe evaporator is poor. At the same time, the separated heat pipe system also relies on the heat exchange between the condenser and seawater. The insufficient heat dissipation of the condenser will not meet the cooling capacity of the ship when the ship is running at low speed or standing still. requirements, and may even lead to start-up failure of the split heat pipe. At the same time, the inability to adjust the temperature is also one of the disadvantages of the traditional separated heat pipe, so it is difficult to apply it to the air-conditioning system of the ship.
此外,传统的热管蒸发器一般为管壳式结构,采用带翅片的光滑圆管,其虽然加工简单,但由于光滑表面汽化核心较少,蒸发过程不易成核,因此换热性能不够理想,用于分离式热管较难满足船舶运行过程中的制冷量要求。In addition, the traditional heat pipe evaporator is generally a shell-and-tube structure, using a smooth round tube with fins. Although it is simple to process, because the smooth surface has fewer vaporization cores, the evaporation process is not easy to nucleate, so the heat transfer performance is not ideal. It is difficult to meet the cooling capacity requirements during the operation of the ship for the separated heat pipe.
发明内容Contents of the invention
针对现有技术的以上缺陷或改进需求,本发明提供了一种船舶用泵辅助冷却系统,其目的在于,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。Aiming at the above defects or improvement needs of the prior art, the present invention provides a pump auxiliary cooling system for ships. Its purpose is to solve the problem that the traditional separated heat pipe cannot regulate the temperature, and at the same time improve the mass flow rate of the main circuit fluid of the cooling system to ensure The stability of system start-up and operation during ship operation.
为实现上述目的,本发明提出了一种船舶用泵辅助冷却系统,包括蒸发器、冷凝器和回转泵,其中:In order to achieve the above object, the present invention proposes a pump auxiliary cooling system for ships, including an evaporator, a condenser and a rotary pump, wherein:
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。The steam collection chamber of the evaporator is connected to the condenser through a steam pipe, the liquid collection chamber of the evaporator is connected to the condenser through a condensation return pipe, and the installation position of the condenser is higher than that of the evaporator; the condensation return A liquid reservoir and an ejector are arranged on the pipeline, and the liquid reservoir and the ejector communicate through the rotary pump and together form an auxiliary circuit.
作为进一步优选的,所述蒸发器包括集汽腔、集液腔、换热管和折流栅,其中:所述集汽腔、换热管、集液腔依次连通设置,所述折流栅用于固定所述换热管。As a further preference, the evaporator includes a steam collecting cavity, a liquid collecting cavity, a heat exchange tube and a baffle grid, wherein: the steam collecting cavity, the heat exchange tube, and the liquid collecting cavity are connected in sequence, and the baffle grid Used to fix the heat exchange tube.
作为进一步优选的,所述换热管内壁沿周向开设有多个燕尾形沟槽。As a further preference, the inner wall of the heat exchange tube is provided with a plurality of dovetail grooves along the circumference.
作为进一步优选的,每个燕尾形沟槽的宽度为0.2mm~1mm,相邻两个燕尾形沟槽间的距离不小于0.5mm。As a further preference, the width of each dovetail-shaped groove is 0.2 mm˜1 mm, and the distance between two adjacent dovetail-shaped grooves is not less than 0.5 mm.
作为进一步优选的,所述燕尾形沟槽底部设置有多个锯齿。As a further preference, the bottom of the dovetail groove is provided with a plurality of serrations.
作为进一步优选的,每个所述锯齿的宽度为30μm~80μm。As a further preference, the width of each sawtooth is 30 μm˜80 μm.
作为进一步优选的,所述折流栅包括固定件和安装在固定件中的多根波形折流杆,该多根波形折流杆平行设置,且相邻波形折流杆的波浪凹凸位置错位设置;所述换热管安装在波形折流杆之间的波浪形间隙中,从而实现换热管的三角形布管。As a further preference, the baffle grid includes a fixing part and a plurality of wave-shaped deflecting rods installed in the fixing part, the multiple wave-shaped deflecting rods are arranged in parallel, and the positions of the waves of the adjacent wave-shaped deflecting rods are misaligned ; The heat exchange tubes are installed in the wave-shaped gap between the corrugated baffle rods, so as to realize the triangular layout of the heat exchange tubes.
作为进一步优选的,所述波形折流杆为椭圆形。As a further preference, the wave-shaped baffle rod is oval.
作为进一步优选的,所述回转泵为齿轮泵。As a further preference, the rotary pump is a gear pump.
作为进一步优选的,所述冷凝回流管道和蒸汽管道上均安装有舷侧阀,且舷侧阀靠近冷凝器一侧。As a further preference, side valves are installed on the condensate return pipe and the steam pipe, and the side valve is close to the side of the condenser.
总体而言,通过本发明所构思的以上技术方案与现有技术相比,主要具备以下的技术优点:Generally speaking, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1.本发明提出的泵辅助冷却系统,在辅助回路设置有回转泵,通过改变回转泵的输入电压调整制冷工质的循环量可实现系统的主动控温,结合引射器的引入,利用辅助回路引射主回路工质,可有效提高主回路流体质量流量,进而提高了系统的运行性能。1. The pump-assisted cooling system proposed by the present invention is equipped with a rotary pump in the auxiliary circuit, and the active temperature control of the system can be realized by changing the input voltage of the rotary pump to adjust the circulation volume of the refrigerant. Combined with the introduction of the ejector, the auxiliary The main loop injecting working medium in the loop can effectively increase the fluid mass flow rate of the main loop, thereby improving the operating performance of the system.
2.泵辅助冷却系统运行时,冷凝器与蒸发器间的重力势差为主要循环动力,通过增设一个泵驱动的回路作为辅助驱动力,将主动和被动散热系统的优点结合起来,与传统冷媒水系统相比,降低了系统运行所需的能耗;同时也可以保障船舶在低速航行时,分离式热管的正常启动和稳定运行。2. When the pump-assisted cooling system is running, the gravity potential difference between the condenser and the evaporator is the main circulation power. By adding a pump-driven circuit as the auxiliary driving force, the advantages of the active and passive cooling systems are combined, and the traditional refrigerant Compared with the water system, the energy consumption required for system operation is reduced; at the same time, it can also ensure the normal startup and stable operation of the separated heat pipe when the ship is sailing at low speed.
3.本发明在换热管内部设置有燕尾形微槽道,其相当于一组微热管阵列,并进一步在槽道内修饰有微米级锯齿结构,使微槽道具有更高的换热性能。具体的,随着制冷工质在管内的相变,可以在增加管路内表面汽化核心的同时,由尖角区或微细槽道产生轴向毛细压差,进而提供额外表面张力辅助重力维持分离式热管的循环,且无可动部件,具有加工方便且免维修的优点;同时考虑到管道的结构强度及可靠性,两槽道之间的距离应不小于0.5mm。3. In the present invention, a dovetail-shaped micro-channel is provided inside the heat exchange tube, which is equivalent to a group of micro-heat pipe arrays, and a micron-level sawtooth structure is further modified in the channel, so that the micro-channel has higher heat exchange performance. Specifically, with the phase change of the refrigerant in the tube, while increasing the vaporization core on the inner surface of the tube, the axial capillary pressure difference can be generated by the sharp corner area or the fine channel, and then provide additional surface tension to assist gravity to maintain separation The circulation of the type heat pipe, and no moving parts, has the advantages of convenient processing and maintenance-free; at the same time, considering the structural strength and reliability of the pipe, the distance between the two channels should not be less than 0.5mm.
4.传统折流杆换热器采用圆直杆对换热管进行支撑,受限于换热量和结构紧凑性的要求,换热管间距往往较小,这使得折流杆布杆空间较小,因此常用的三角型布管方式较难在折流杆换热器中应用。本发明采用了相邻波纹杆对换热管进行定位,仅需一个折流栅即可实现对换热管的支撑;同时,波形折流杆可使流体流经时形成湍流,与直杆相比具有更好的混流均温效果,即横截面的温度分布更为均匀,从而使蒸发器具有更高效的换热性能。4. The traditional baffle rod heat exchanger uses round straight rods to support the heat exchange tubes. Limited by the requirements of heat transfer and compact structure, the distance between the heat exchange tubes is often small, which makes the space for the baffle rod layout relatively small. Therefore, the commonly used triangular pipe layout method is difficult to apply in the baffle rod heat exchanger. The invention uses adjacent corrugated rods to position the heat exchange tubes, and only one baffle grid is needed to support the heat exchange tubes; at the same time, the corrugated baffle rods can form turbulent flow when the fluid flows through, which is comparable to the straight rods. It has a better mixed flow temperature uniformity effect, that is, the temperature distribution of the cross section is more uniform, so that the evaporator has a more efficient heat exchange performance.
5.本发明蒸发器壳程部分相邻波形折流杆的波浪凹凸位置错位设置,从而实现波形折流杆间换热管的三角形布管,与正方形布管方式相比空间利用率更高;进而可以在相同空间中增加壳程布管数,从而增大热流体与管路的换热面积。该结构解决了三角形布管方式较难在折流杆换热器中应用的问题,提升了换热器的紧凑性。5. In the present invention, the concavo-convex positions of the adjacent corrugated baffle rods on the shell side of the evaporator are misplaced, so as to realize the triangular tube layout of the heat exchange tubes between the corrugated baffle rods, and the space utilization rate is higher compared with the square tube layout method; Furthermore, the number of shell-side pipes can be increased in the same space, thereby increasing the heat exchange area between the thermal fluid and the pipes. This structure solves the problem that the triangular tube layout method is difficult to apply in the baffle rod heat exchanger, and improves the compactness of the heat exchanger.
6.波纹折流杆横截面优选为椭圆形,相比于常用的圆形截面杆,椭圆形截面杆具有更好的流体温度场均温性,对流换热性能更强,更好地满足船舶运行过程中的制冷量要求。6. The cross section of the corrugated baffle rod is preferably elliptical. Compared with the commonly used circular cross-section rod, the elliptical cross-section rod has better fluid temperature field uniformity, stronger convective heat transfer performance, and better meets the needs of ships. Cooling capacity requirements during operation.
附图说明Description of drawings
图1中(a)、(b)为本发明实施例热管蒸发器结构示意图;Among Fig. 1 (a), (b) is the structural representation of heat pipe evaporator of the embodiment of the present invention;
图2为本发明实施例蒸汽管路及波纹折流杆排布示意图;Fig. 2 is a schematic diagram of the arrangement of steam pipelines and corrugated baffle rods according to the embodiment of the present invention;
图3中(a)、(b)为本发明实施例燕尾形凹槽和锯齿结构示意图;(a) and (b) in Fig. 3 are schematic diagrams of dovetail-shaped grooves and sawtooth structures according to an embodiment of the present invention;
图4为本发明实施例波纹折流杆结构示意图;Fig. 4 is a schematic structural diagram of a corrugated baffle rod according to an embodiment of the present invention;
图5中(a)、(b)为本发明实施例圆形、椭圆形波纹折流杆横截面示意图;(a) and (b) in Fig. 5 are cross-sectional schematic diagrams of circular and elliptical corrugated baffle rods according to embodiments of the present invention;
图6为本发明实施例船舶用泵辅助冷却系统结构示意图。Fig. 6 is a schematic structural diagram of a pump auxiliary cooling system for a ship according to an embodiment of the present invention.
在所有附图中,相同的附图标记用来表示相同的元件或结构,其中:1-集汽腔,2-集液腔,3-换热管,4-波形折流杆,5-引射器,6-冷凝回流管道,7-蒸汽管道,8-舷侧阀,11-冷凝器,12-蒸发器,13-储液器,14-回转泵。In all the drawings, the same reference numerals are used to represent the same elements or structures, among which: 1-steam collection chamber, 2-liquid collection chamber, 3-heat exchange tube, 4-wave baffle rod, 5-lead Ejector, 6-condensate return pipe, 7-steam pipe, 8-side valve, 11-condenser, 12-evaporator, 13-reservoir, 14-rotary pump.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。此外,下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
本发明实施例提供的一种船舶用泵辅助冷却系统,如图6所示,包括蒸发器12以及冷凝器11、储液器13、回转泵14、引射器5、冷凝回流管道6、蒸汽管道7以及舷侧阀8,其中:A pump-assisted cooling system for a ship provided by an embodiment of the present invention, as shown in FIG.
所述蒸发器12的集汽腔1通过蒸汽管道7与冷凝器11连接,蒸发器12的集液腔2通过冷凝回流管道6与冷凝器11连接,且冷凝器11安装于舱外,位置高于蒸发器12;冷凝回流管道6由储液器13开始分为主回路及安装有回转泵14的辅助回路,并通过引射器5重新汇合,所述回转泵14优选为齿轮泵;储液器13顶部为充灌口,底部两开口分别连接主回路及辅助回路,其容积取决于回路内部管路和部件的体积,以及回路的工质充灌率;蒸发器壳体两侧开有百叶窗作为空气的进出口;舷侧阀8设置于冷凝回流管道6和蒸汽管道7上靠近冷凝器11侧的位置。The steam collection chamber 1 of the
具体的,所述蒸发器12包括集汽腔1、集液腔2、换热管3和折流栅,如图1所示,其中:Specifically, the
所述集汽腔1、换热管3、集液腔2依次连通设置,所述折流栅可为多个,每个折流栅包括环形的固定件和安装在固定件中的多根波形折流杆4,所述换热管3安装在波形折流杆4之间的波浪形间隙中,如图2所示。The steam collection chamber 1, the
进一步的,如图4所示,多根波形折流杆4平行设置,且相邻波形折流杆4的波浪凹凸位置错位设置,从而实现换热管3的三角形布管,从而增加了壳程布管数、换热面积、以及扰流区域的面积,提升换热器的紧凑性。所述波形折流杆4为圆形或椭圆形,优选为椭圆形,如图5所示,椭圆形截面杆具有更好的流体温度场均温性,对流换热性能更强。Further, as shown in Figure 4, a plurality of
进一步的,如图3所示,所述换热管3内壁沿周向开设有多个燕尾形沟槽,所述燕尾形沟槽底部设置有多个微米级锯齿;具体的,对于直径为8mm的镍白铜B10管,燕尾形槽道的结构尺寸取为0.3mm×0.3mm×0.5mm,开设20个燕尾形槽道。燕尾形沟槽内的微米级锯齿使用矩形锯齿,尺寸为50μm×50μm。需要指出,考虑到管道的结构强度及可靠性,两槽道之间的距离应不小于0.5mm,槽道的深宽比以及数量可根据毛细极限与沸腾极限进行调整。槽道的毛细力由汽液两相界面沿管路方向的曲率差提供,系统工作时,换热管内的制冷工质发生相变,管路上侧的槽道内弯月面曲率增大,所提供毛细力驱动制冷工质不断向热管管路补充。Further, as shown in Figure 3, the inner wall of the
加工方面,蒸发器采用列管式换热器,为保证工质管路与管板间不出现泄漏,采用强度胀以及密封焊的方法进行连接,以确保连接的安全可靠、无泄漏。工质管路采用氩弧焊全焊接结构,通过氦质谱严格泄漏检验,漏率检测为5*10-9Pa,确保密封性能。In terms of processing, the evaporator adopts a tube-and-tube heat exchanger. In order to ensure that there is no leakage between the working fluid pipeline and the tube sheet, the connection is made by strength expansion and sealing welding to ensure that the connection is safe, reliable and leak-free. The working medium pipeline adopts argon arc welding all-welded structure, and has passed the strict leak test of helium mass spectrometry, and the leak rate test is 5*10 -9 Pa to ensure the sealing performance.
系统工作时,需要冷却的设备水进入蒸发器12壳侧与换热管3换热,热管内的制冷工质受热后相变为气相上升至集汽腔1,并沿蒸汽管道7进入冷凝器11中由海水对其进行冷却。冷凝后的制冷工质在重力作用下沿冷凝回流管道6进入储液器13中。根据船舶的运行情况,高速航行时关闭回转泵14,制冷工质由主回路返回蒸发器的集液腔2;低速航行时打开回转泵14,通过调节回转泵14的输入功率对工质流量进行调节,工质分别进入主回路及辅助回路,并在引射器5处发生汇合,最后返回蒸发器的集液腔2内。本发明提出的船舶专用泵辅助冷却系统可以解决传统分离式热管无法调控温度的问题,同时可增强船舶运行情况下系统启动和运行的稳定性并达到降低能耗的目标。When the system is working, the equipment water that needs to be cooled enters the shell side of the
本领域的技术人员容易理解,以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, etc., All should be included within the protection scope of the present invention.
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