CN1085824C - Multi-stage gas wave refrigerator - Google Patents
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- 238000001816 cooling Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 45
- 238000005057 refrigeration Methods 0.000 abstract description 18
- 230000000717 retained effect Effects 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 229930195733 hydrocarbon Natural products 0.000 abstract description 2
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
一种单体的多级非定常膨胀制冷机，压力气体在一台制冷机内进行多次膨胀制冷，在大膨胀比工况下，每一级的膨胀比减小，整机能具有很高的等熵制冷效率，可以产生很低的低温。该机靠压力气射流对接受管内的潴留气做不定常膨胀功而制冷，故能在较低的转速下高效地工作，具有制造、运行成本低，操作维护简便、可靠性高等优点，可广泛应用于混合气体的液化分离、石油气中回收轻烃、天然气液化以及产生低温冷气流源等领域。
A single multi-stage unsteady expansion refrigerator, the pressure gas is expanded and refrigerated multiple times in one refrigerator, under the condition of large expansion ratio, the expansion ratio of each stage is reduced, and the whole machine has high performance The isentropic refrigeration efficiency can produce very low low temperature. The machine relies on the pressure air jet to perform unsteady expansion work on the retained gas in the receiving pipe to cool, so it can work efficiently at a lower speed, and has the advantages of low manufacturing and operating costs, easy operation and maintenance, and high reliability. It can be widely used It is used in the liquefaction and separation of mixed gases, the recovery of light hydrocarbons from petroleum gas, the liquefaction of natural gas, and the generation of low-temperature cold gas sources.
Description
本发明属于压力气体的膨胀制冷技术领域。The invention belongs to the technical field of expansion and refrigeration of pressurized gas.
利用气体的压力膨胀制冷，可以取得比用工质循环制冷更低的低温，在混合气体的液化分离、石油气中回收轻烃、天然气液化以及产生低温冷气流源等领域应用广泛。除透平膨胀机之外，较低转速(每分钟1000～3000转)的热分离机和气波制冷机等以其操作维护简便、可靠性高等优点而占有一席之地。The use of gas pressure expansion refrigeration can achieve a lower temperature than refrigeration with working fluid circulation. It is widely used in the fields of liquefaction and separation of mixed gases, recovery of light hydrocarbons from petroleum gas, natural gas liquefaction, and generation of low-temperature cold gas flow sources. In addition to turbo expanders, heat separators and gas wave refrigerators with lower speeds (1000-3000 revolutions per minute) occupy a place due to their advantages of easy operation and maintenance and high reliability.
热分离机和气波制冷机靠压力气体射流依次对各根末端封闭的接受管内的潴留气做不定常膨胀功，在潴留气中产生压缩波与激波，转化成热散出；压力气体射流因膨胀作出功而减少了能量，使得自身变冷。这类制冷机凭此机理特点能够在较低的转速下高效地工作，从而避免了象低温透平膨胀机那样必须在高转速下工作的一系列不便。The heat separator and gas wave refrigerator rely on the pressure gas jet to perform unsteady expansion work on the retained gas in the receiving tubes with closed ends in turn, and generate compression waves and shock waves in the retained gas, which are converted into heat dissipation; the pressure gas jet is caused by Expansion does work and reduces energy, making itself cooler. This type of refrigerator can work efficiently at a lower speed by virtue of this mechanism feature, thus avoiding a series of inconveniences that must work at a high speed like a low-temperature turbo expander.
但目前的热分离机类和气波制冷机均属于一次不定常膨胀制冷(象中国专利87101903.5，89213744.4，90222999.0等)，其适合的膨胀比一般均不大于4。如果需要更大的制冷温降，或者有很高的余压可供利用，它们便不能适应，主要表现为等熵制冷效率急剧降低，其制冷温降随膨胀比的增加只有微小的增大。究其原因是由于这类机器的制冷原理所限制的，故没有多大改进的余地。But present heat separator class and gas wave refrigerator all belong to unsteady expansion refrigeration (like Chinese patent 87101903.5,89213744.4,90222999.0 etc.), and its suitable expansion ratio is generally all no more than 4. If a larger cooling temperature drop is required, or there is a high residual pressure available, they cannot adapt. The main performance is that the isentropic cooling efficiency drops sharply, and the cooling temperature drop only slightly increases with the increase of the expansion ratio. Trace it to its cause because the refrigeration principle of this type of machine is limited, so there is not much room for improvement.
采用多台机串联制冷，则每一台机的膨胀比可大为减小，虽可以满足大膨胀比的要求，但投资要增大，占地要增加，且很可能匹配不好，使总体制冷效率提不高。If multiple units are used for refrigeration in series, the expansion ratio of each unit can be greatly reduced. Although the requirement for a large expansion ratio can be met, the investment and land occupation will be increased, and the matching may be poor, making the overall Refrigeration efficiency is not improved.
本发明的目的就是要提供一种在大膨胀比工况下仍能保持甚至提高制冷效率的单体不定常膨胀制冷机——多级气波制冷机。The object of the present invention is to provide a single unsteady expansion refrigerating machine—a multi-stage gas wave refrigerating machine—that can maintain or even improve the refrigerating efficiency under the condition of large expansion ratio.
本发明多级气波制冷机的技术解决方案为：The technical solution of the multi-stage gas wave refrigerator of the present invention is:
在机器的结构上，使压力气体在机内进行两次或者多次不定常膨胀，即形成单机多级。则每一级的膨胀比即可大为减小，各单级制冷效率可以显著提高，从而使整机效率随之提高。In terms of the structure of the machine, the pressurized gas undergoes two or more unsteady expansions in the machine, that is, a single machine with multiple stages is formed. Then the expansion ratio of each stage can be greatly reduced, and the refrigeration efficiency of each single stage can be significantly improved, so that the efficiency of the whole machine can be improved accordingly.
该机只用一套转动轴件，但相应地却装有两个或两个以上同速旋转的气体射流分配器(以流道轴线或与轴线有一小角度的线段为旋转半径或为旋转母线，作圆周运动的旋转喷嘴)，和具有两组或两组以上辐射排列或圆周排列的数米长的末端封闭的接受管(接受管的中后段外壁散热)，从第一射流分配器喷射出的气流先进入第一组接受管中不定常膨胀，对接受管内的潴留气做功而制冷，制冷气返出接受管后再导入第二分配器中，从该分配器射出的气流再进第二组接受管，制冷后再返出，依次类推。这样，气体经过两次或两次以上膨胀制冷后，可以产生很大的温降。The machine only uses a set of rotating shafts, but correspondingly it is equipped with two or more gas jet distributors rotating at the same speed (the axis of the flow channel or a line segment with a small angle to the axis is the radius of rotation or the generatrix of rotation) , circular motion rotating nozzles), and two or more sets of radially arranged or circumferentially arranged receiving tubes with closed ends of several meters (the outer wall of the middle and rear section of the receiving tube dissipates heat), sprayed from the first jet distributor The outgoing air flow first enters the first set of receiving tubes and expands unsteadily, and works on the retained air in the receiving tubes to cool, and the refrigerated air returns to the receiving tubes and then enters the second distributor, and the air flow emitted from the distributor enters the second distributor. The second group accepts the tube, returns after cooling, and so on. In this way, after the gas undergoes two or more expansions and refrigerations, a large temperature drop can be produced.
采用多级膨胀制冷，则每一级的膨胀比便可以控制在2～3之间，这对于非定常膨胀制冷机是最为适宜的。而为了进一步提高对应此膨胀比值下各级的制冷效率，本发明多级气波制冷机的技术解决方案还包括以下几点结构特征：With multi-stage expansion refrigeration, the expansion ratio of each stage can be controlled between 2 and 3, which is most suitable for unsteady expansion refrigerators. In order to further improve the refrigeration efficiency of each stage corresponding to this expansion ratio, the technical solution of the multi-stage gas wave refrigerator of the present invention also includes the following structural features:
1.为减少欲制冷射流气与接受管内潴留气之间的掺和，提高射流进入接受管入口时的等熵性，旋转气体射流分配器喷嘴出口的开口形状为沿旋向前端宽出的象形T字形而不为矩形，该T字形的对称轴线与旋转射流分配器的旋转纬线平行。1. In order to reduce the mixing between the jet gas to be refrigerated and the retained gas in the receiving pipe, and improve the isentropy when the jet enters the inlet of the receiving pipe, the opening shape of the nozzle outlet of the rotating gas jet distributor is a pictogram that is widened along the front end of the rotation T-shaped rather than rectangular, the axis of symmetry of the T-shaped is parallel to the rotation latitude of the rotary jet distributor.
2.为减小从接受管返出的已制冷气流的流动损失，其流出所碰到的旋转射流分配器的非喷气圆周弧段设计成比喷嘴口旋转半径缩小的圆锥或曲圆锥面，其母线与旋转轴线成35～55°角，制冷气流经其锥面反射70～110°角后导出。2. In order to reduce the flow loss of the refrigerated air flow returned from the receiving pipe, the non-jet circular arc section of the rotary jet distributor encountered by the outflow is designed as a conical or curved conical surface with a smaller radius of rotation than the nozzle mouth. The bus bar forms an angle of 35-55° with the axis of rotation, and the cooling air is exported after being reflected by the conical surface at an angle of 70-110°.
3.为取得较好的管口瞬时边界条件，能与接受管内的运动波系相匹配，提高制冷效率，本发明气波制冷机旋转射流分配器喷嘴出口开口沿旋向的前部和后部都设置了一段依次旋转封挡接受管口的圆周弧面。3. In order to obtain a better instantaneous boundary condition of the nozzle, which can match the moving wave system in the receiving pipe and improve the refrigeration efficiency, the nozzle outlet opening of the rotary jet distributor of the gas wave refrigerator of the present invention is located along the front and rear of the rotation direction All are provided with a section of circumferential arc surface which rotates successively to block the receiving nozzle.
由于采用多级膨胀，克服了该类非定常膨胀制冷机在一次大膨胀比下所不能避免的射流在接受管入口处的急剧增加的能量损耗，因此其总体制冷效率比一次膨胀型机大为提高；加之研究采用了适宜于小膨胀比工况的射流喷嘴开口形状，和适宜于返出气流流动的反射圆锥或曲圆锥面，以及旋转封挡接受管口的圆周弧面所造成的适宜边界条件，更进一步地提高了每一级的制冷效率。Due to the use of multi-stage expansion, it overcomes the unavoidable sharply increased energy loss of the jet flow at the inlet of the receiving pipe under a large expansion ratio of this type of unsteady expansion refrigerator, so its overall refrigeration efficiency is greater than that of the primary expansion type. Improvement; In addition, the research adopts the shape of the opening of the jet nozzle suitable for the working condition of small expansion ratio, and the reflective conical or curved conical surface suitable for the flow of the return airflow, and the suitable boundary caused by the circular arc surface of the rotating sealing receiving nozzle conditions, further improving the cooling efficiency of each stage.
由于该多级膨胀制冷机为单体机，故可比多机串联节省许多投资和占地，且可以设计成各级都具有最佳的匹配状态，不但稳定高效，而且可靠性强。Since the multi-stage expansion refrigerator is a single unit, it can save a lot of investment and land occupation compared with multi-unit series connection, and can be designed so that all levels have the best matching state, which is not only stable and efficient, but also has strong reliability.
图1为实施本发明技术方案的一种双级气波制冷机的总体结构简图。Fig. 1 is a schematic diagram of the overall structure of a two-stage gas wave refrigerator implementing the technical solution of the present invention.
图2为本发明气波制冷机的一种旋转气体射流分配器的外形及内部流道示意图。Fig. 2 is a schematic diagram of the shape and internal flow path of a rotating gas jet distributor of the gas wave refrigerator of the present invention.
图3为本发明气波制冷机的一种旋转气体射流分配器上的喷嘴出口的开口形状、喷嘴前部和后部的封挡接受管口的圆周弧面以及非喷气圆锥形圆周弧段的简图。Fig. 3 is the opening shape of the nozzle outlet on a kind of rotating gas jet distributor of the gas wave refrigerator of the present invention, the circumferential arc surface of the block receiving nozzle at the front and rear of the nozzle and the shape of the non-jet conical circumferential arc section Sketch.
下面结合附图对本发明的实施例做进一步详细的描述：Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:
见图1，实施本发明的一种双级气波制冷机由机壳19，两端盖12、20，转轴10，滚动轴承11、21，第一和第二旋转射流分配器4、7，旋转动密封13、16和18，两组辐射排列的接受管5、8，以及机架14所组成。其中，转轴设有两段空心轴段，空心轴段的圆周壁开孔，使气体能够流进和流出空心流道，以将机内空腔中的气体导入旋转射流分配器中；旋转射流分配器上对称布置有2～4个喷嘴流道，其喷嘴出口开口于分配器的外圆弧段的圆周面上，从轴向投影面看，流道轴线与径向成一定的角度，射流分配器与转轴以每分钟1000～5000转同速转动；每组接受管的数量为20～100根，各管的末端封闭，开口端固装于机壳圆周面上朝向圆心(径向)或朝向略偏于圆心的钻孔(孔数量与接受管数量相等)上，管的内孔与机壳钻孔对位成光滑连续流道，每一组中各接受管的管长基本相等，管长为1.5～4.5米；机壳钻孔处的内圆直径略微大于射流分配器上喷嘴出口开口处外圆弧段的直径。See Fig. 1, implement a kind of two-stage gas wave refrigerator of the present invention by casing 19, end cover 12,20, rotating shaft 10, rolling bearing 11,21, first and second rotary jet distributor 4,7, rotate Dynamic seals 13, 16 and 18, two groups of receiving tubes 5 and 8 arranged radially, and frame 14 are formed. Among them, the rotating shaft is provided with two sections of hollow shaft section, and the circumferential wall of the hollow shaft section has holes, so that the gas can flow into and out of the hollow flow channel, so as to guide the gas in the cavity of the machine into the rotary jet distributor; the rotary jet distribution There are 2 to 4 nozzle flow channels symmetrically arranged on the device, and the nozzle outlets are opened on the circumferential surface of the outer circular arc section of the distributor. Seen from the axial projection plane, the axis of the flow channel and the radial direction form a certain angle, and the jet distribution The device and the rotating shaft rotate at the same speed of 1000-5000 revolutions per minute; the number of receiving tubes in each group is 20-100, the ends of each tube are closed, and the open ends are fixed on the circumferential surface of the casing facing the center (radial direction) or toward the On the drill hole slightly off the center of the circle (the number of holes is equal to the number of receiving tubes), the inner hole of the tube is aligned with the drilling hole of the casing to form a smooth continuous flow channel. The tube lengths of the receiving tubes in each group are basically equal, and the tube length It is 1.5-4.5 meters; the diameter of the inner circle at the drilling hole of the casing is slightly larger than the diameter of the outer arc section at the outlet opening of the nozzle on the jet distributor.
压力气体由机身入口1进入机内空腔3，从转轴10的圆周开孔进到空心轴段2而导入第一旋转射流分配器4中，从其上的喷嘴口喷出的高速气流依次轮流入射到第一组各接受管5中，按圆周排列顺序对各管内的潴流气体做不定常膨胀功，通过在潴流气中产生压缩波和激波将功转化成热量通过管壁向外界散发；其后射流分配器喷嘴依次转离各个管口，膨胀做功制冷后的气体便依次从第一组各接受管口返出，在射流分配器4(见图3)的非喷气圆周弧段(与此瞬时对位的各接受管口不能被封挡，从而可排出制冷气)的圆锥弧面(图3的26和22位置)上反射约90°后进入空腔17，完成了一级膨胀制冷。然后，气体再从空腔17所对空心轴段的圆周开孔进到该轴段的空心流道6而被导入第二旋转射流分配器7中，再通过其上的喷嘴口依次轮流射入第二组接受管8中，进行与第一级同样的制冷过程。最后，完成制冷的气体进入空腔15，然后从出口9流出。The pressurized gas enters the inner cavity 3 from the inlet 1 of the fuselage, enters the hollow shaft section 2 from the circumferential opening of the rotating shaft 10, and guides it into the first rotary jet distributor 4, and the high-speed airflow ejected from the nozzles on it sequentially The flow is injected into the receiving tubes 5 of the first group in turn, and the unsteady expansion work is performed on the accumulated gas in each tube according to the order of the circumference, and the work is converted into heat through the tube wall to the outside by generating compression waves and shock waves in the accumulated gas. Afterwards, the nozzles of the jet distributor are turned away from each nozzle in turn, and the gas after expansion and cooling is returned from the receiving nozzles of the first group in turn, and in the non-jet circular arc section of the jet distributor 4 (see Figure 3). (The receiving nozzles that are aligned with this instant can not be blocked, so that the cooling air can be discharged) Reflect about 90° on the conical arc surface (26 and 22 positions of Figure 3) and enter the cavity 17, completing the first stage Expansion refrigeration. Then, the gas enters the hollow flow channel 6 of the shaft section from the circumferential opening of the hollow shaft section opposite to the cavity 17 and is introduced into the second rotary jet distributor 7, and then is injected in turn through the nozzle openings on it. In the second group of receiving pipes 8, the same refrigeration process as that of the first stage is carried out. Finally, the refrigerated gas enters the cavity 15 and then exits through the outlet 9 .
为提高各级在小膨胀比下的制冷效率，本发明气波制冷机的旋转射流分配器喷嘴出口的开口形状为象形T字形(见图3的24)，其对称轴线与喷嘴盘的纬线平行，沿旋向的前端宽出，其前端宽度为后续宽的1.05～1.8倍，前宽区长度为喷嘴口总长的5～30％，喷嘴口总长为其后端宽度的0.8～3.2倍。In order to improve the refrigeration efficiency of each stage at a small expansion ratio, the opening shape of the nozzle outlet of the rotary jet distributor of the gas wave refrigerator of the present invention is a pictographic T shape (see 24 in Figure 3), and its axis of symmetry is parallel to the latitude of the nozzle plate , the front end along the direction of rotation is wide, the front end width is 1.05 to 1.8 times the subsequent width, the length of the front wide area is 5 to 30% of the total length of the nozzle opening, and the total length of the nozzle opening is 0.8 to 3.2 times the width of the rear end.
为取得能与接受管内的运动波系相匹配的管口瞬时边界条件，提高制冷效率，本发明气波制冷机旋转射流分配器喷嘴出口开口沿旋向的前部和后部所设置的两段依次旋转封挡接受管口的圆周弧面(见图3)，其弧长范围是：前部弧面23的弧长为喷嘴口长的0.6～2.2倍，后部弧面25的弧长为喷嘴口长的0.7～2.5倍。In order to obtain the instantaneous boundary condition of the nozzle that can match the moving wave system in the receiving pipe and improve the refrigeration efficiency, the nozzle outlet opening of the rotary jet distributor of the gas wave refrigerator of the present invention is provided with two sections at the front and rear of the rotation direction. Rotate the circular arc surface (seeing Fig. 3) that seals and accepts nozzle successively, and its arc length range is: the arc length of front
本发明气波制冷机的流量由第一旋转射流分配器4上各喷嘴的总开口面积决定。经过各级的膨胀，气体的体积流量不断增加，因此，第二级以后的各旋转射流分配器上各喷嘴的总开口面积要依次按比例增加，根据各级所要求的膨胀比，每一后级的总开口面积为其前一级的1.5～4.5倍，各级旋转射流分配器上每一喷嘴的开口面积按总面积均分或按180°角对称。The flow rate of the gas wave refrigerator of the present invention is determined by the total opening area of each nozzle on the first rotary jet distributor 4 . After the expansion of each stage, the volume flow rate of the gas increases continuously. Therefore, the total opening area of each nozzle on each rotary jet distributor after the second stage should increase in proportion in turn. According to the expansion ratio required by each stage, each subsequent stage The total opening area of each stage is 1.5 to 4.5 times that of the previous stage, and the opening area of each nozzle on the rotary jet distributor at each stage is equally divided according to the total area or symmetrical at an angle of 180°.
相应于体积流量的增加，后面级接受管的截面积、空心轴段圆周上的开孔面积和空心流道截面积，以及喷嘴流道截面积均须逐级增大，出机器的冷气出口面积要比高压气入口面积大一倍以上。Corresponding to the increase of the volume flow, the cross-sectional area of the receiving pipe of the subsequent stage, the opening area on the circumference of the hollow shaft section, the cross-sectional area of the hollow flow channel, and the cross-sectional area of the nozzle flow channel must be increased step by step, and the area of the cold air outlet of the machine It is more than twice as large as the high-pressure gas inlet area.
本发明气波制冷机转轴10的旋转动力的一部分或者全部来自于射流分配器喷嘴喷出来的方向与径向成一定角度的射流的反推力。其转轴的一头可伸出机外，接以电机、阻尼器等稳速装置。A part or all of the rotational power of the rotating shaft 10 of the gas wave refrigerator of the present invention comes from the reverse thrust of the jet sprayed from the nozzle of the jet distributor in a certain angle to the radial direction. One end of its rotating shaft can extend outside the machine, and is connected with speed-stabilizing devices such as motors and dampers.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96115022 CN1085824C (en) | 1996-01-12 | 1996-01-12 | Multi-stage gas wave refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96115022 CN1085824C (en) | 1996-01-12 | 1996-01-12 | Multi-stage gas wave refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1171541A CN1171541A (en) | 1998-01-28 |
| CN1085824C true CN1085824C (en) | 2002-05-29 |
Family
ID=5122326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96115022 Expired - Fee Related CN1085824C (en) | 1996-01-12 | 1996-01-12 | Multi-stage gas wave refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1085824C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100575815C (en) * | 2008-04-30 | 2009-12-30 | 大连理工大学 | Damping hedging gas wave refrigerator |
| CN101571326B (en) * | 2009-05-22 | 2011-05-04 | 深圳市力科气动科技有限公司 | Gas wave refrigerator |
| CN101586889A (en) * | 2009-05-22 | 2009-11-25 | 深圳市力科气动科技有限公司 | Distributor rotor for gas wave regrigerator and gas wave regrigerator |
| CN204147280U (en) * | 2013-07-11 | 2015-02-11 | 天士力制药集团股份有限公司 | Air cooling dripping pill production line |
| FR3061276B1 (en) * | 2016-12-22 | 2020-01-10 | Engie | DEVICE AND METHOD FOR LIQUEFACTING NATURAL GAS AND VESSEL COMPRISING SUCH A DEVICE |
| CN107166792B (en) * | 2017-05-08 | 2022-11-29 | 大连理工大学 | Variable cross-section two-end opening pressure oscillation pipe refrigerator |
| CN107014583B (en) * | 2017-05-08 | 2023-07-04 | 大连理工大学 | A multi-functional testing platform for pressure oscillating tubes with openings at both ends |
| CN107367084B (en) * | 2017-08-31 | 2019-07-30 | 大连理工大学 | A wave rotor type multistage refrigerator |
| CN107843021B (en) * | 2017-11-13 | 2019-07-30 | 大连理工大学 | A double-layer nozzle and double-row tube gas-wave refrigerator with built-in drive hydraulic balance |
| CN114216279B (en) * | 2021-12-26 | 2022-09-06 | 大连理工大学 | A forced water-cooled and heat-insulated double-layer oscillating tube gas-wave refrigerator |
-
1996
- 1996-01-12 CN CN 96115022 patent/CN1085824C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1171541A (en) | 1998-01-28 |
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