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CN106123169A - Energy-saving air conditioner - Google Patents

Energy-saving air conditioner Download PDF

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Publication number
CN106123169A
CN106123169A CN201610487623.5A CN201610487623A CN106123169A CN 106123169 A CN106123169 A CN 106123169A CN 201610487623 A CN201610487623 A CN 201610487623A CN 106123169 A CN106123169 A CN 106123169A
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Prior art keywords
heat exchange
cage
rotating shaft
hollow rotating
energy
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CN201610487623.5A
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CN106123169B (en
Inventor
胡振强
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Zhang Guangyu
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Priority to CN201810985916.5A priority Critical patent/CN109000311B/en
Priority to CN201610487623.5A priority patent/CN106123169B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Conditioning Control Device (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention provides an energy-saving air conditioner, which comprises an inner machine and an outer machine; the outer machine comprises strip-shaped heat exchange copper pipes which are parallel to each other and circumferentially arrayed, and two ends of each strip-shaped heat exchange copper pipe are respectively provided with an annular heat exchange copper pipe communicated with all the strip-shaped heat exchange copper pipes; the strip-shaped heat exchange copper pipe and the annular heat exchange copper pipe form a heat exchange cage together; a cylindrical shell is arranged on the periphery of the heat exchange cage, an excitation coil is arranged on the inner periphery of the cylindrical shell in a surrounding manner, and a rotating magnetic field rotating around the axis of the heat exchange cage is formed when the excitation coil is electrified; a hollow rotating shaft extends on the axis of the heat exchange cage, and the heat exchange cage and the hollow rotating shaft are fixed through at least one fan; two ends of the hollow rotating shaft are connected in series with the refrigerant circulating loop through a sealed rotating joint; the middle part of the hollow rotating shaft is plugged, the plugged part is used as a boundary, and two sides of the hollow rotating shaft are respectively communicated with the annular heat exchange copper pipes on two sides of the heat exchange cage through connecting pipes. The energy-saving air conditioner has a good energy-saving effect.

Description

节能型空调Energy-saving air conditioner

技术领域technical field

本发明涉及暖通领域，特别地，涉及一种空调。The invention relates to the field of heating and ventilation, in particular to an air conditioner.

背景技术Background technique

目前的空调主要包括内机和外机，内机主要包括控制模块和风扇，消耗能量较小；外机则包括热泵机组、翅片换热器；为了控制空调的工作能耗，需要充分保障翅片换热器的换热效率；为此，通常采用外机风扇对翅片换热器进行连续送风，即便如此，风扇所形成的气流速度仍然十分有限，其与翅片换热器的相对速度较小，需要采用较大功率的风扇，才能保障翅片换热器的换热效率，因此，不仅能耗较大，而且工作噪音也较大。另一方面，限于该种翅片换热器的特殊结构，其通透性较差，对于外界气流，受到外机风扇的驱动电机的阻碍，难以穿过该翅片换热器，导致外界自然气流的潜能无法得到利用，造成能量浪费。The current air conditioner mainly includes an indoor unit and an outdoor unit. The inner unit mainly includes a control module and a fan, which consumes less energy; the outer unit includes a heat pump unit and a fin heat exchanger; The heat exchange efficiency of the fin heat exchanger; for this reason, the fan of the external unit is usually used to continuously supply air to the fin heat exchanger. Even so, the airflow velocity formed by the fan is still very limited. The speed is small, and a fan with high power needs to be used to ensure the heat exchange efficiency of the fin heat exchanger. Therefore, not only the energy consumption is large, but also the working noise is relatively large. On the other hand, limited to the special structure of this kind of fin heat exchanger, its permeability is poor. For the external air flow, it is hindered by the driving motor of the fan of the external unit, and it is difficult to pass through the fin heat exchanger, resulting in natural The potential of the airflow cannot be utilized, resulting in wasted energy.

发明内容Contents of the invention

针对上述问题，本发明的目的在于提供一种节能型空调，该节能型空调具有良好的节能效应。In view of the above problems, the object of the present invention is to provide an energy-saving air conditioner, which has a good energy-saving effect.

本发明解决其技术问题所采用的技术方案是：该节能型空调包括内机、外机；所述外机包括相互平行且周向阵列条形换热铜管，所述条形换热铜管的两端分别设有一个连通所有条形换热铜管的环形换热铜管；所述条形换热铜管、环形换热铜管共同形成换热笼；所述换热笼的外周设有一个筒状外壳，所述筒状外壳的内周绕置有励磁线圈，所述励磁线圈通电时形成绕所述换热笼的轴线旋转的旋转磁场；所述换热笼的轴线上延伸有一根空心转轴，换热笼与空心转轴之间通过至少一个风扇相固定；所述空心转轴的两端通过密封旋转接头串接于制冷剂循环回路；所述空心转轴的中部封堵，以该封堵处为界，空心转轴的两侧分别通过连接管连通所述换热笼两侧的环形换热铜管。The technical solution adopted by the present invention to solve the technical problem is: the energy-saving air conditioner includes an indoor unit and an outer unit; The two ends of each are respectively provided with an annular heat exchange copper tube connected to all strip heat exchange copper tubes; the strip heat exchange copper tube and the annular heat exchange copper tube together form a heat exchange cage; the outer periphery of the heat exchange cage is set There is a cylindrical shell, an excitation coil is wound around the inner circumference of the cylindrical shell, and a rotating magnetic field that rotates around the axis of the heat exchange cage is formed when the excitation coil is energized; a shaft extending on the axis of the heat exchange cage A hollow rotating shaft, the heat exchange cage and the hollow rotating shaft are fixed by at least one fan; both ends of the hollow rotating shaft are connected in series to the refrigerant circulation circuit through a sealed rotary joint; the middle part of the hollow rotating shaft is sealed, and the sealing The blockage is a boundary, and the two sides of the hollow rotating shaft are respectively connected to the annular heat-exchanging copper tubes on both sides of the heat-exchanging cage through connecting pipes.

作为优选，所述筒状外壳的两端分别蒙盖有通风网板，以屏蔽励磁线圈的电磁场，同时又不影响通风。Preferably, both ends of the cylindrical casing are respectively covered with ventilation screens to shield the electromagnetic field of the exciting coil without affecting the ventilation.

作为优选，所述空心转轴匹配有一个转速传感器，所述转速传感器耦合至所述励磁线圈的励磁控制器；所述励磁控制器使所述励磁线圈按如下方式产生旋转磁场：一、使旋转磁场的方向与励磁线圈通电前，转速传感器感测到的转速方向一致；二、连续调整励磁电流的大小，使所述转速传感器感测到的转速维持在设定转速。Preferably, the hollow rotating shaft is matched with a speed sensor, and the speed sensor is coupled to the excitation controller of the excitation coil; the excitation controller makes the excitation coil generate a rotating magnetic field in the following manner: 1. Make the rotating magnetic field The direction of the excitation current is consistent with the direction of the rotation speed sensed by the rotation speed sensor before the excitation coil is energized; 2. The magnitude of the excitation current is continuously adjusted to maintain the rotation speed sensed by the rotation speed sensor at the set rotation speed.

作为优选，所述空心转轴与环形换热铜管之间的连接管周向均布，其中，制冷剂流背向环形换热管的连接管只有一根，且该连接管中还串接有节流阀；而制冷剂流指向环形换热管的连接管具有2根以上；且所述制冷剂循环回路中不再设置压缩机。As a preference, the connecting pipe between the hollow rotating shaft and the annular heat exchange copper pipe is evenly distributed in the circumferential direction, wherein there is only one connecting pipe where the refrigerant flow faces away from the annular heat exchange pipe, and the connecting pipe is connected in series with a throttling valve; and there are more than two connecting pipes where the refrigerant flow is directed to the annular heat exchange pipe; and the refrigerant circulation circuit is no longer provided with a compressor.

本发明的有益效果在于：该节能型空调在工作时，所述励磁线圈与换热笼构成一个笼型异步电机，换热笼跟随旋转磁场快速旋转，使换热笼的条形换热铜管与空气形成巨大的相对速度，同时，所述风扇又将新鲜空气连续送入换热笼内，风扇本身也构成与空气快速相对运动的换热面，从而形成强劲的换热效率，以节约能耗；并且由于筒形外壳、换热笼的轴向通透结构，使外界的气流可以穿过换热笼，并且推动风扇，使换热笼、风扇与自然气流进行快速换热，进一步节约了能耗。The beneficial effect of the present invention is that: when the energy-saving air conditioner is working, the excitation coil and the heat exchange cage form a cage-type asynchronous motor, and the heat exchange cage rotates rapidly following the rotating magnetic field, so that the strip-shaped heat-exchange copper tubes of the heat exchange cage It forms a huge relative speed with the air. At the same time, the fan continuously sends fresh air into the heat exchange cage. The fan itself also forms a heat exchange surface that moves relatively quickly with the air, thereby forming a strong heat exchange efficiency to save energy. and due to the axial transparent structure of the cylindrical shell and the heat exchange cage, the external airflow can pass through the heat exchange cage, and the fan is pushed, so that the heat exchange cage, the fan and the natural air flow can quickly exchange heat, further saving energy consumption.

附图说明Description of drawings

图1是本节能型空调的外机实施例一的端向示意图。Fig. 1 is a schematic end view of Embodiment 1 of the external unit of the energy-saving air conditioner.

图2是本节能型空调中，换热笼的侧向示意图。Fig. 2 is a lateral schematic diagram of the heat exchange cage in the energy-saving air conditioner.

图3是本节能型空调的外机实施例二的端向示意图。Fig. 3 is a schematic end view of the second embodiment of the external unit of the energy-saving air conditioner.

具体实施方式detailed description

下面结合附图和实施例对本发明进一步说明：Below in conjunction with accompanying drawing and embodiment the present invention is further described:

本发明涉及的节能型空调包括内机、外机；在图1、图2所示的实施例一中，所述外机包括相互平行且周向阵列条形换热铜管11，所述条形换热铜管11的两端分别设有一个连通所有条形换热铜管11的环形换热铜管12；所述条形换热铜管11、环形换热铜管12共同形成换热笼1；所述换热笼1的外周设有一个筒状外壳2，所述筒状外壳2的内周绕置有励磁线圈3，所述励磁线圈3通电时形成绕所述换热笼1的轴线旋转的旋转磁场；所述换热笼1的轴线上延伸有一根空心转轴4，换热笼1与空心转轴4之间通过至少一个风扇5相固定，即所述换热笼1、风扇5、空心转轴4相互固定；所述空心转轴4在换热笼1两侧安装于轴承6上，且该空心转轴4的两端通过密封旋转接头40串接于制冷剂循环回路；所述空心转轴4的中部封堵，以该封堵处41为界，空心转轴4的两侧分别通过连接管51、52连通所述换热笼1两侧的环形换热铜管12。The energy-saving air conditioner involved in the present invention includes an internal unit and an external unit; in the first embodiment shown in Fig. The two ends of the shaped heat exchange copper tube 11 are respectively provided with an annular heat exchange copper tube 12 connected to all strip heat exchange copper tubes 11; the strip heat exchange copper tube 11 and the annular heat exchange copper tube 12 jointly form a heat exchange Cage 1; the outer periphery of the heat exchange cage 1 is provided with a cylindrical casing 2, and the inner periphery of the cylindrical casing 2 is provided with an excitation coil 3, and when the excitation coil 3 is energized, it forms a coil around the heat exchange cage 1 A rotating magnetic field rotating on the axis of the heat exchange cage 1; a hollow shaft 4 extends on the axis of the heat exchange cage 1, and at least one fan 5 is fixed between the heat exchange cage 1 and the hollow shaft 4, that is, the heat exchange cage 1, the fan 5. The hollow rotating shafts 4 are fixed to each other; the hollow rotating shafts 4 are installed on the bearings 6 on both sides of the heat exchange cage 1, and the two ends of the hollow rotating shafts 4 are connected in series to the refrigerant circulation circuit through the sealed rotary joints 40; the hollow rotating shafts The middle part of the rotating shaft 4 is blocked, with the blocking place 41 as the boundary, the two sides of the hollow rotating shaft 4 are respectively connected to the annular heat-exchanging copper pipes 12 on both sides of the heat-exchanging cage 1 through connecting pipes 51 and 52 .

上述节能型空调在工作时，所述励磁线圈3与换热笼1构成一个笼型异步电机，换热笼1跟随旋转磁场快速旋转，使换热笼1的条形换热铜管11与空气形成巨大的相对速度，该种相对速度远远大于采用大功率风扇形成的风速；同时，所述风扇5又将新鲜空气连续送入换热笼1内，连续供应大量换热潜能，而风扇5本身也构成与空气快速相对运动的换热面，从而形成强劲的换热效率，以节约能耗；并且由于筒形外壳2、换热笼1的轴向通透结构，使外界的气流可以穿过换热笼1，并且推动风扇5，使换热笼1、风扇5与自然气流进行快速换热，进一步节约了能耗。When the above-mentioned energy-saving air conditioner is working, the excitation coil 3 and the heat exchange cage 1 constitute a cage-type asynchronous motor, and the heat exchange cage 1 rotates rapidly following the rotating magnetic field, so that the strip-shaped heat-exchange copper tubes 11 of the heat exchange cage 1 and the air A huge relative speed is formed, which is far greater than the wind speed formed by a high-power fan; at the same time, the fan 5 continuously sends fresh air into the heat exchange cage 1 to continuously supply a large amount of heat exchange potential, and the fan 5 It also forms a heat exchange surface that moves quickly relative to the air, thereby forming a strong heat exchange efficiency to save energy consumption; and due to the axially transparent structure of the cylindrical shell 2 and the heat exchange cage 1, the outside air can pass through The heat exchange cage 1 is passed through and the fan 5 is pushed, so that the heat exchange cage 1, the fan 5 and the natural air flow can perform rapid heat exchange, further saving energy consumption.

此外，所述筒状外壳2的两端还可以分别蒙盖一块通风网板，以屏蔽励磁线圈的电磁场，同时又不影响通风。In addition, the two ends of the cylindrical casing 2 can be covered with a ventilation screen to shield the electromagnetic field of the exciting coil without affecting the ventilation.

所述空心转轴4还可以匹配一个转速传感器（未图示），所述转速传感器耦合至所述励磁线圈3的励磁控制器（未图示）；所述励磁控制器使所述励磁线圈3按如下方式产生旋转磁场：一、使旋转磁场的方向与励磁线圈通电前，转速传感器感测到的转速方向一致；二、连续调整励磁电流的大小，使所述转速传感器感测到的转速维持在设定转速。按照该方案，可以避免电磁力矩与自然风力矩相反，导致阻力矩变大，浪费能耗；并且可以充分利用自然风力进行换热，使励磁电流的大小与自然风力相适应，使换热笼的转速维持在设定速度，以将能量的损耗降低到最低水平。The hollow rotating shaft 4 can also be matched with a speed sensor (not shown), and the speed sensor is coupled to an excitation controller (not shown) of the excitation coil 3; the excitation controller makes the excitation coil 3 press The rotating magnetic field is generated in the following manner: 1. Make the direction of the rotating magnetic field consistent with the direction of the rotational speed sensed by the rotational speed sensor before the excitation coil is energized; 2. Continuously adjust the magnitude of the excitation current to maintain the rotational speed sensed by the rotational speed sensor at Set the speed. According to this scheme, it can avoid the opposite between the electromagnetic torque and the natural wind torque, which will cause the resistance torque to become larger and waste energy consumption; and it can make full use of the natural wind force for heat exchange, so that the magnitude of the excitation current can be adapted to the natural wind force, so that the heat exchange cage The rotational speed is maintained at the set speed to minimize energy loss.

对于本节能型空调的外机的实施例二，如图3所示，与实施例一不同的是，所述空心转轴4与环形换热铜管12之间的连接管51、52周向均布，其中，制冷剂流背向环形换热管12的连接管52只有一根，且该连接管52中还串接有节流阀7；而制冷剂流指向环形换热管12的连接管51具有2根以上；且所述制冷剂循环回路中不再设置压缩机。按照该方案，在换热笼1的快速旋转过程中，由于连接管51所产生的离心作用，使连接管51内形成巨大的抽吸力，将制冷剂循环回路中的制冷剂流压入换热笼1内，而由于所述节流阀7的节流作用，使得换热笼1内的压力剧增，从而使制冷剂流在换热笼1内液化；即，直接由该换热笼1本身构成了传统机组中的压缩机；该换热笼1本身通过旋转同时实现了高速换热与制冷剂压缩作用，具有良好的节能效应，同时又精简了空调机组的结构。For the second embodiment of the external unit of the energy-saving air conditioner, as shown in Figure 3, the difference from the first embodiment is that the connecting pipes 51 and 52 between the hollow rotating shaft 4 and the annular heat exchange copper pipe 12 are evenly distributed in the circumferential direction, Among them, there is only one connecting pipe 52 where the refrigerant flow faces away from the annular heat exchange tube 12, and the throttle valve 7 is connected in series in the connecting pipe 52; 2 or more; and no compressor is installed in the refrigerant circulation circuit. According to this solution, during the rapid rotation of the heat exchange cage 1, due to the centrifugal effect generated by the connecting pipe 51, a huge suction force is formed in the connecting pipe 51, and the refrigerant flow in the refrigerant circulation circuit is pressed into the heat exchanger. In the heat exchange cage 1, and due to the throttling effect of the throttle valve 7, the pressure in the heat exchange cage 1 increases sharply, so that the refrigerant flow is liquefied in the heat exchange cage 1; that is, directly from the heat exchange cage 1 itself constitutes the compressor in the traditional unit; the heat exchange cage 1 itself realizes high-speed heat exchange and refrigerant compression through rotation, has a good energy-saving effect, and at the same time simplifies the structure of the air-conditioning unit.

以上所述仅为本发明的较佳实施例，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，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications and equivalent replacements made within the spirit and principles of the present invention should be included within the protection scope of the present invention .

Claims (4)

1. an energy-saving air conditioning, including interior machine, outer machine；It is characterized in that: described outer machine includes being parallel to each other and circumferential array Bar shaped heat exchange copper tube (11), described bar shaped heat exchange copper tube (11) be respectively arranged at two ends with one connect all bar shaped heat exchange copper tubes (11) annular heat exchange copper tube (12)；Described bar shaped heat exchange copper tube (11), annular heat exchange copper tube (12) are collectively forming heat exchange cage (1)；The periphery of described heat exchange cage (1) is provided with a cylindrical case (2), and the inner circumferential of described cylindrical case (2) is around being equipped with excitation wire Circle (3), forms the rotating excitation field of the axis rotation around described heat exchange cage (1) during described magnet exciting coil (3) energising；Described heat exchange cage (1) hollow rotating shaft (4) it is extended with on axis, by least one fan between heat exchange cage (1) and hollow rotating shaft (4) (5) fixing, the most described heat exchange cage (1), fan (5), hollow rotating shaft (4) interfix；Described hollow rotating shaft (4) is at heat exchange cage (1) both sides are installed on bearing (6), and the two ends of this hollow rotating shaft (4) are serially connected with cold-producing medium by seal swivel joint (40) Closed circuit；The middle part closure of described hollow rotating shaft (4), with (41) at this closure as boundary, the both sides of hollow rotating shaft (4) lead to respectively Cross connecting tube (51,52) and connect the annular heat exchange copper tube (12) of described heat exchange cage (1) both sides.
Energy-saving air conditioning the most according to claim 1, it is characterised in that: lid is covered at the two ends of described cylindrical case (2) respectively There is ventilation web plate, to shield the electromagnetic field of magnet exciting coil (3).
Energy-saving air conditioning the most according to claim 1, it is characterised in that: described hollow rotating shaft (4) coupling has a rotating speed Sensor, described speed probe coupled to the excitation controller of described magnet exciting coil (3)；Described excitation controller is encouraged described in making Magnetic coil (3) produces rotating excitation field as follows: before one, making the direction of rotating excitation field be energized with magnet exciting coil, revolution speed sensing The rotary speed direction that device senses is consistent；Two, adjust the size of exciting current continuously, make the rotating speed that described speed probe senses Maintain setting speed.
Energy-saving air conditioning the most according to claim 1, it is characterised in that: described hollow rotating shaft (4) and annular heat exchange copper tube (12) connecting tube (51, the 52) circumference between is uniform, and wherein, the connecting tube (52) of cold-producing medium stream annular heat exchange tube dorsad (12) is only There is one, and this connecting tube (52) is also serially connected with choke valve；And cold-producing medium stream points to the connecting tube of annular heat exchange tube (12) (51) there are more than 2；And described refrigerant circulation loop no longer arranges compressor.
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