CN106595132A - Horizontal type single-tube-pass direct-contact condensation heat exchanger - Google Patents
Horizontal type single-tube-pass direct-contact condensation heat exchanger Download PDFInfo
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- CN106595132A CN106595132A CN201611221885.3A CN201611221885A CN106595132A CN 106595132 A CN106595132 A CN 106595132A CN 201611221885 A CN201611221885 A CN 201611221885A CN 106595132 A CN106595132 A CN 106595132A
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- 230000005494 condensation Effects 0.000 title abstract description 10
- 238000009833 condensation Methods 0.000 title abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 238000005057 refrigeration Methods 0.000 claims abstract description 24
- 238000003466 welding Methods 0.000 claims abstract description 7
- 239000000498 cooling water Substances 0.000 claims description 24
- 239000013526 supercooled liquid Substances 0.000 claims description 9
- 238000004781 supercooling Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims 7
- 230000037431 insertion Effects 0.000 claims 2
- 238000003780 insertion Methods 0.000 claims 2
- 239000011148 porous material Substances 0.000 claims 2
- 230000008676 import Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000005192 partition Methods 0.000 abstract description 28
- 238000000034 method Methods 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/02—Subcoolers
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
本发明公开了一种卧式单管程直接接触凝结换热器。本发明分隔挡板上设有多个微小通孔，其与第一管板、筒体的两侧轴向侧面内壁接触位置焊接连接；第一管板和第二管板的上半部分设有多个换热管孔，分别插入换热管的一端并焊接连接；筒体上部开设有与第一高温气体截止阀、供液截止阀的并联出口连接管焊接的孔口，底部开设有与过冷液截止阀、供液泵并联入口连接管焊接的孔口，靠近分隔挡板的下部位置、开设有与第二高温气体截止阀的连接管焊接的孔口。本发明可以有效地降低制冷压缩机的排气温度，减少压力比，提高制冷系统的性能，结构简单，操作方便、保护环境、节约能源。
The invention discloses a horizontal single tube pass direct contact condensation heat exchanger. The partition baffle of the present invention is provided with a plurality of tiny through holes, which are welded and connected with the first tube sheet and the inner walls of the axial sides on both sides of the cylinder; the upper half of the first tube sheet and the second tube sheet are provided with A plurality of heat exchange tube holes are respectively inserted into one end of the heat exchange tube and connected by welding; the upper part of the cylinder body is provided with an orifice welded with the parallel outlet connecting pipe of the first high-temperature gas stop valve and the liquid supply stop valve, and the bottom part is provided with an orifice connected with the process outlet. The orifice for welding the parallel inlet connection pipe of the cold liquid shut-off valve and the liquid supply pump is provided with an orifice welded with the connecting pipe of the second high-temperature gas shut-off valve near the lower part of the partition baffle. The invention can effectively reduce the exhaust temperature of the refrigeration compressor, reduce the pressure ratio, improve the performance of the refrigeration system, has simple structure, is convenient to operate, protects the environment and saves energy.
Description
技术领域technical field
本发明涉及一种制冷技术领域，特别是涉及一种卧式单管程直接接触凝结换热器。The invention relates to the technical field of refrigeration, in particular to a horizontal single-tube direct-contact condensation heat exchanger.
背景技术Background technique
水冷式冷凝制冷系统中，制冷压缩机排出的高温高压气体通过水冷却介质带走热量，降温凝结成高温高压的液体，制冷剂与冷却水热交换，需经两侧流体对流换热和换热器传热壁面的导热，特别是换热器传热壁面本身以及壁面集聚的润滑油与污垢形成的热阻，造成传热系数下降，同样的换热面积，散发同样的热量所需制冷剂与冷却介质间的传热温差增大，导致制冷压缩机的排气压力升高，压比增大，容积效率降低，制冷压缩机的耗功增多，制冷系统的性能系数下降，如果节流降压前的制冷剂过冷，则可以增大蒸发器的制冷量，相应提高制冷系统的性能，因此，开发直接接触凝结带过冷的换热器，降低制冷压缩机的排气温度，减少压力比，提高容积效率，降低制冷压缩机的耗功，增大制冷量，改善制冷系统的性能，实现节能环保。但目前未见有实施例。In the water-cooled condensing refrigeration system, the high-temperature and high-pressure gas discharged from the refrigeration compressor takes away heat through the water cooling medium, and then cools down and condenses into a high-temperature and high-pressure liquid. The heat exchange between the refrigerant and the cooling water requires convection and heat exchange of fluids on both sides The heat conduction of the heat transfer wall of the heat exchanger, especially the thermal resistance formed by the heat transfer wall itself of the heat exchanger and the lubricating oil and dirt accumulated on the wall, causes the heat transfer coefficient to drop. The heat transfer temperature difference between the cooling media increases, which leads to an increase in the discharge pressure of the refrigeration compressor, an increase in the pressure ratio, a decrease in volumetric efficiency, an increase in the power consumption of the refrigeration compressor, and a decrease in the performance coefficient of the refrigeration system. If the previous refrigerant is subcooled, the cooling capacity of the evaporator can be increased, and the performance of the refrigeration system can be improved accordingly. Therefore, the development of a heat exchanger directly in contact with the condensation zone subcooling can reduce the exhaust temperature of the refrigeration compressor and reduce the pressure ratio. , improve the volumetric efficiency, reduce the power consumption of the refrigeration compressor, increase the cooling capacity, improve the performance of the refrigeration system, and realize energy saving and environmental protection. But there is no embodiment at present.
发明内容Contents of the invention
本发明的目的是针对现有制冷系统存在的技术缺陷，提供一种卧式单管程直接接触凝结换热器，以提高制冷系统的运行性能。The object of the present invention is to provide a horizontal single-tube direct-contact condensation heat exchanger to improve the operating performance of the refrigeration system in view of the technical defects existing in the existing refrigeration system.
为实现本发明的目的所采用的技术方案是：The technical scheme adopted for realizing the purpose of the present invention is:
一种卧式单管程直接接触凝结换热器，包括第一高温气体截止阀、第二管板、分隔板、第二端盖、供液管、第二高温气体截止阀、供液泵、第一管板、通孔、分隔挡板、支架、过冷液截止阀、筒体、换热管、冷却水出水管、供液截止阀、第一端盖和冷却水进水管。A horizontal single-tube direct-contact condensation heat exchanger, including a first high-temperature gas stop valve, a second tube plate, a partition plate, a second end cover, a liquid supply pipe, a second high-temperature gas stop valve, and a liquid supply pump , the first tube plate, the through hole, the partition baffle, the bracket, the supercooled liquid cut-off valve, the cylinder body, the heat exchange tube, the cooling water outlet pipe, the liquid supply cut-off valve, the first end cover and the cooling water inlet pipe.
所述分隔挡板为长方形，其上设有多个微小通孔，其与第一管板、筒体的两侧轴向侧面内壁接触位置焊接连接；分隔板为半圆形，其与第二端盖接触位置焊接连接；第二管板为圆形，其与分隔挡板紧密接触，与筒体接触的位置焊接连接，其位于分隔挡板的上半部分设有多个换热管孔，插入换热管的一端并焊接连接；第一管板为圆形，其与分隔挡板和筒体的接触的位置分别焊接连接，其位于分隔挡板的上半部分设有多个换热管孔，插入换热管的一端并焊接连接。The partition baffle is rectangular, with a plurality of tiny through holes, which are welded and connected to the first tube sheet and the inner walls of both axial sides of the cylinder; the partition is semicircular, and it is connected to the first The contact position of the two end caps is welded and connected; the second tube plate is circular, which is in close contact with the partition baffle, and welded at the position in contact with the cylinder body. It is located on the upper half of the partition baffle with multiple heat exchange tube holes , insert one end of the heat exchange tube and weld it; the first tube plate is circular, and its contact position with the partition baffle and the cylinder is respectively welded and connected, and it is located on the upper half of the partition baffle with multiple heat exchange tubes. Tube hole, insert one end of the heat exchange tube and weld the connection.
所述筒体为圆筒形，筒体的上部开设有与第一高温气体截止阀、供液截止阀的并联出口连接管焊接的孔口，底部开设有与过冷液截止阀、供液泵并联入口连接管焊接的孔口，靠近分隔挡板的下部位置、开设有与第二高温气体截止阀的连接管焊接的孔口，第一端盖与第一管板、第二端盖与第二管板间通过密封垫片和连接螺栓紧密连接。The cylinder is cylindrical, and the upper part of the cylinder is provided with an orifice welded with the parallel outlet connecting pipe of the first high-temperature gas shut-off valve and the liquid supply shut-off valve, and the bottom is provided with an orifice connected with the supercooled liquid shut-off valve and the liquid supply pump. The orifice for welding the connecting pipe of the parallel inlet is close to the lower part of the partition baffle, and there is an orifice for welding with the connecting pipe of the second high-temperature gas stop valve, the first end cover and the first tube plate, the second end cover and the second The two tube plates are tightly connected by sealing gaskets and connecting bolts.
所述第一高温气体截止阀、第二高温气体截止阀的入口与制冷压缩机的排气接管焊接连接，过冷液截止阀与节流降压元件的入口接管焊接连接。The inlets of the first high-temperature gas shut-off valve and the second high-temperature gas shut-off valve are welded to the exhaust pipe of the refrigeration compressor, and the supercooled liquid shut-off valve is welded to the inlet pipe of the throttling and pressure-reducing element.
所述供液泵的进出口分别与两段供液管焊接连接。The inlet and outlet of the liquid supply pump are respectively welded to two sections of liquid supply pipes.
所述支架设在筒体的下端部，一端与筒体的外壁焊接连接，另一端固定在基础上。The bracket is arranged at the lower end of the cylinder, one end is welded to the outer wall of the cylinder, and the other end is fixed on the foundation.
所述冷却水出水管与冷却水循环的水泵入口连接，冷却水进水管与冷却水塔的出水接管连接。The cooling water outlet pipe is connected to the water pump inlet of the cooling water circulation, and the cooling water inlet pipe is connected to the water outlet connecting pipe of the cooling water tower.
所述第一高温气体截止阀、第二高温气体截止阀、供液泵、过冷液截止阀和供液截止阀由液位浮球阀控制启闭。The opening and closing of the first high-temperature gas shut-off valve, the second high-temperature gas shut-off valve, the liquid supply pump, the supercooled liquid shut-off valve and the liquid supply shut-off valve are controlled by liquid level float valves.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
1、本发明的卧式单管程直接接触凝结换热器，直接接触凝结和过冷一体，利用高温高压的制冷剂气体与液体直接接触放出热量凝结，可以有效地降低制冷压缩机的排气温度，减少压力比，提高容积效率，降低制冷压缩机的耗功，改善制冷系统的性能。1. The horizontal single-tube direct contact condensation heat exchanger of the present invention integrates direct contact condensation and supercooling, and uses high temperature and high pressure refrigerant gas to directly contact the liquid to release heat and condense, which can effectively reduce the exhaust of the refrigeration compressor temperature, reduce the pressure ratio, increase the volumetric efficiency, reduce the power consumption of the refrigeration compressor, and improve the performance of the refrigeration system.
2、本发明的卧式单管程直接接触凝结换热器，实现高温高压液体节流降压前过冷，使得进入蒸发器的焓值降低，提大制冷系统制冷量，进一步提高制冷系统的性能，结构简单，操作方便、保护环境、节约能源。2. The horizontal single-tube side of the present invention directly contacts the condensing heat exchanger to realize supercooling of the high-temperature and high-pressure liquid before throttling and stepping down, so that the enthalpy value entering the evaporator is reduced, the cooling capacity of the refrigeration system is increased, and the efficiency of the refrigeration system is further improved. High performance, simple structure, convenient operation, environmental protection and energy saving.
附图说明Description of drawings
图1所示为本发明的卧式单管程直接接触凝结换热器的示意图；Fig. 1 shows the schematic diagram of horizontal single tube pass direct contact condensation heat exchanger of the present invention;
图2所示为A向示意图。Figure 2 is a schematic diagram in direction A.
具体实施方式detailed description
以下结合附图和具体实施例对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
本发明的卧式单管程直接接触凝结换热器示意图如图1和图2所示，包括第一高温气体截止阀1、第二管板2、分隔板3、第二端盖4、供液管5、第二高温气体截止阀6、供液泵7、第一管板8、通孔9、分隔挡板10、支架11、过冷液截止阀12、筒体13、换热管14、冷却水出水管15、供液截止阀16、第一端盖17和冷却水进水管18。The schematic diagram of the horizontal single-tube direct contact condensation heat exchanger of the present invention is shown in Figure 1 and Figure 2, including a first high-temperature gas stop valve 1, a second tube plate 2, a partition plate 3, a second end cover 4, Liquid supply pipe 5, second high-temperature gas stop valve 6, liquid supply pump 7, first tube plate 8, through hole 9, partition baffle 10, bracket 11, supercooled liquid stop valve 12, cylinder 13, heat exchange tube 14. Cooling water outlet pipe 15 , liquid supply stop valve 16 , first end cover 17 and cooling water inlet pipe 18 .
所述筒体13水平放置，第一管板8和第二管板2为圆形，第一管板8和第二管板分别与筒体的两端固定，第一端盖17和第二端盖4为半球形，第一端盖17和第二端盖的圆形底边分别与第一管板8和第二管板2固定；The cylinder 13 is placed horizontally, the first tube plate 8 and the second tube plate 2 are circular, the first tube plate 8 and the second tube plate are respectively fixed to the two ends of the cylinder, the first end cap 17 and the second The end cover 4 is hemispherical, and the circular bases of the first end cover 17 and the second end cover are respectively fixed to the first tube sheet 8 and the second tube sheet 2;
所述分隔挡板10为长方形，分隔挡板10上设有多个微小通孔9，分隔挡板10分别与第一管板8、第二管板2及筒体13的内壁接触位置焊接连接；分隔板3为半圆形，分隔板3半圆形周边与第二端盖4接触位置焊接连接，分隔板3底边与第二管板2接触位置焊接连接；第二管板2位于分隔挡板10的上半部分设有多个换热管孔，多个换热管孔插入换热管14的一端并焊接连接；第一管板8位于分隔挡板10的上半部分插入换热管14的另一端并焊接连接；The partition baffle 10 is rectangular, and the partition baffle 10 is provided with a plurality of tiny through holes 9, and the partition baffle 10 is welded and connected with the inner wall contact positions of the first tube sheet 8, the second tube sheet 2 and the cylinder body 13 respectively. The partition plate 3 is semicircular, the semicircular periphery of the partition plate 3 is welded to the contact position of the second end cover 4, and the bottom edge of the partition plate 3 is welded to the contact position of the second tube sheet 2; the second tube sheet 2 The upper part of the partition baffle 10 is provided with a plurality of heat exchange tube holes, and the plurality of heat exchange tube holes are inserted into one end of the heat exchange tube 14 and connected by welding; the first tube sheet 8 is located in the upper half of the partition baffle 10 Insert the other end of the heat exchange tube 14 and weld it;
所述筒体13为圆筒形，筒体13的上部开设有与第一高温气体截止阀1、供液截止阀16的并联出口连接管焊接的孔口，筒体13底部开设有与过冷液截止阀12、供液泵7并联入口连接管焊接的孔口，筒体13中部位置开设有与第二高温气体截止阀6的连接管焊接的孔口，供液截止阀16通过供液管5连接供液泵7；第一端盖17与第一管板8、第二端盖4与第二管板2间通过密封垫片和连接螺栓紧密连接。The cylinder 13 is cylindrical, and the upper part of the cylinder 13 is provided with an orifice welded with the parallel outlet connecting pipe of the first high-temperature gas shut-off valve 1 and the liquid supply shut-off valve 16, and the bottom of the cylinder 13 is provided with a supercooled The liquid shut-off valve 12 and the liquid supply pump 7 are connected in parallel to the inlet connecting pipe welded orifice, and the middle of the cylinder body 13 is provided with an orifice welded with the connecting pipe of the second high-temperature gas shut-off valve 6, and the liquid supply shut-off valve 16 passes through the liquid supply pipe 5 is connected to the liquid supply pump 7; the first end cover 17 and the first tube sheet 8, and the second end cover 4 and the second tube sheet 2 are tightly connected by sealing gaskets and connecting bolts.
所述第一高温气体截止阀1、第二高温气体截止阀6的入口与制冷压缩机的排气接管焊接连接，过冷液截止阀12与节流降压元件的入口接管焊接连接。The inlets of the first high-temperature gas shut-off valve 1 and the second high-temperature gas shut-off valve 6 are welded to the exhaust pipe of the refrigeration compressor, and the supercooled liquid shut-off valve 12 is welded to the inlet pipe of the throttling and pressure-reducing element.
所述供液泵7的进出口分别与两段供液管5焊接连接。The inlet and outlet of the liquid supply pump 7 are respectively welded to the two sections of liquid supply pipes 5 .
所述支架11设在筒体13的下端部，一端与筒体13的外壁焊接连接，另一端固定在基础上。The bracket 11 is arranged at the lower end of the cylinder 13, one end is welded to the outer wall of the cylinder 13, and the other end is fixed on the foundation.
所述冷却水出水管15与冷却水循环的水泵入口连接，冷却水进水管18与冷却水塔的出水接管连接。The cooling water outlet pipe 15 is connected with the water pump inlet of the cooling water circulation, and the cooling water inlet pipe 18 is connected with the water outlet connecting pipe of the cooling water tower.
所述第一高温气体截止阀1、第二高温气体截止阀6、供液泵7、过冷液截止阀12和供液截止阀16由液位浮球阀控制启闭。The opening and closing of the first high-temperature gas shut-off valve 1 , the second high-temperature gas shut-off valve 6 , the liquid supply pump 7 , the subcooled liquid shut-off valve 12 and the liquid supply shut-off valve 16 are controlled by liquid level float valves.
组装时，筒体13与第一管板8焊接，分隔挡板10分别与筒体13、第一管板8焊接，第二管板2与筒体13焊接，在第一管板8、第二管板2的换热管孔穿换热管14并焊接焊接，将第二端盖4分别与分封板3、冷却水进水管18的焊接连接，第一端盖17与冷却水出水管15的焊接连接，在筒体13相应的孔口位置焊接各个接管，焊接支架11。During assembly, the cylinder body 13 is welded to the first tube sheet 8, the partition baffle 10 is welded to the cylinder body 13 and the first tube sheet 8 respectively, and the second tube sheet 2 is welded to the cylinder body 13. The heat exchange tube hole of the second tube plate 2 passes through the heat exchange tube 14 and is welded, and the second end cover 4 is respectively connected to the sealing plate 3 and the cooling water inlet pipe 18, and the first end cover 17 is connected to the cooling water outlet pipe 15. For the welding connection, each connecting pipe is welded at the corresponding opening position of the cylinder body 13, and the bracket 11 is welded.
制冷系统启动运行时，制冷压缩机排出的高温高压的制冷剂气体经油分离器、第一高温气体截止阀1进入第一管板8、第二管板2、筒体13、换热管14和分隔挡板10组成的上部空间，与换热管内的冷却水进行热交换，放出热量，凝结的高温高压液体经分隔挡板10底部的微小通孔9进入下部的空间，当下部液位到设定液位时，第一高温气体截止阀1关闭，第二高温气体截止阀6、供液泵7、供液截止阀16开启，液体在供液泵7推动下，进入第一管板8、第二管板2、筒体13、换热管14和分隔挡板10组成的上部空间，与换热管内的冷却水进行热交换，放出热量过冷，经分隔挡板10的微小通孔9进入下部的空间，与经过第二高温气体截止阀6进入第一管板8、第二管板2、筒体13和分隔挡板10组成的下部空间的高温高压气体直接接触，气体凝结成液体，液体经过冷液截止阀12进入节流降压元件，为蒸发器提供低温低压的制冷剂液体；经冷却水塔降温的冷却水经冷却水进水管18，第二管板2、分隔板3和第二端盖4的空间进入换热管内，吸收制冷剂的热量后，经冷却水出水管15、水泵泵入冷却水塔。When the refrigeration system starts to operate, the high-temperature and high-pressure refrigerant gas discharged from the refrigeration compressor enters the first tube sheet 8, the second tube sheet 2, the cylinder body 13, and the heat exchange tube 14 through the oil separator and the first high-temperature gas stop valve 1 The upper space formed by the partition baffle 10 exchanges heat with the cooling water in the heat exchange tube to release heat, and the condensed high-temperature and high-pressure liquid enters the lower space through the tiny through hole 9 at the bottom of the partition baffle 10. When the lower liquid level reaches When setting the liquid level, the first high-temperature gas shut-off valve 1 is closed, the second high-temperature gas shut-off valve 6, the liquid supply pump 7, and the liquid supply shut-off valve 16 are opened, and the liquid enters the first tube plate 8 under the push of the liquid supply pump 7 , the upper space formed by the second tube sheet 2, cylinder body 13, heat exchange tube 14, and partition baffle 10, exchanges heat with the cooling water in the heat exchange tube, and releases heat for supercooling, passing through the tiny through holes of the partition baffle 10 9 enters the lower space, and directly contacts with the high-temperature and high-pressure gas that enters the lower space formed by the first tube sheet 8, the second tube sheet 2, the cylinder body 13 and the partition baffle 10 through the second high-temperature gas stop valve 6, and the gas condenses into Liquid, the liquid enters the throttling and pressure-reducing element through the cold liquid shut-off valve 12 to provide low-temperature and low-pressure refrigerant liquid for the evaporator; the cooling water cooled by the cooling water tower passes through the cooling water inlet pipe 18, the second tube plate 2, and the partition plate 3 and the space of the second end cover 4 enters the heat exchange tube, after absorbing the heat of the refrigerant, it is pumped into the cooling water tower through the cooling water outlet pipe 15 and the water pump.
以上所述仅是本发明的优选实施方式，应当指出的是，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.
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