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    • 91. 发明授权
      US4433555A Defroster for a refrigerator 失效
    • Defroster for a refrigerator
    • 冰箱除霜器
    • US4433555A
    • 1984-02-28
    • US447180
    • 1982-12-06
    • Niels P. Thorsen
    • Niels P. Thorsen
    • F25D21/08 , F25D21/00 , F25D21/06
    • F25D21/002
    • The invention relates to refrigerator apparatus and particularly to the defrosting thereof. The thermostat is responsive to evaporator temperature and has first and second displacement ranges for respectively controlling the normal operation and the defrosting operation via first and second switches. A counter counts the cyclical operations of the first switch and at a predetermined count actuates an interrupter switch which is effective to block power to the compressor motor and direct power to the defroster heating apparatus. At a predetermined evaporator temperature the second switch is actuated which serves to reset the counter and this has the effect of ending the defrost cycle and returning the apparatus to normal operation under the control of the first switch.
    • 本发明涉及冰箱装置，特别涉及其除霜。 恒温器响应于蒸发器温度，并具有第一和第二位移范围，用于分别通过第一和第二开关控制正常操作和除霜操作。 计数器对第一开关的周期性操作进行计数，并且在预定计数下，启动断续器开关，该断路器开关有效地阻塞对压缩机电动机的电力并且向除霜器加热装置引导电力。 在预定的蒸发器温度下，第二开关被致动，其用于复位计数器，并且具有在第一开关的控制下结束除霜循环并使设备返回正常操作的效果。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Global Dossier Espacenet 法律信息 同族专利 专利引用
    • 95. 发明授权
      US4083196A Compressor refrigeration plant 失效
    • Compressor refrigeration plant
    • 压缩机制冷设备
    • US4083196A
    • 1978-04-11
    • US744632
    • 1976-11-24
    • Bent Karll
    • Bent Karll
    • F24F11/02 , F25B1/00 , F25B5/02 , F25B41/06 , F25B47/02 , F25B49/00 , F25B49/02 , F25D21/00
    • F25B41/06 , F25B49/00 , F25B49/02 , F25B5/02 , F25D21/002
    • The invention relates to a temperature control system for refrigeration unit. In this system a capillary tube extends between the condenser and the evaporator and a chamber upstream from at least a section of the capillary tube contains a PTC resistor. The PTC resistor is supplied with current in response to a thermostatic sensing of a predetermined low temperature in the room or compartment which contains the evaporator. In response thereto the PTC resistor generates enough heat to produce a vapor plug which throttles of stops the flow of refrigerant in the capillary section but not enough heat to cause coking of the refrigerant oil which would permanently plug the capillary tube. The downstream capillary section is so dimensioned that it is permeable to liquid refrigerant but is substantially impermeable to the refrigerant vapor generated in the chamber.The invention relates to a compressor refrigeration plant comprising a capillary tube between the condenser and evaporator and, associated with the capillary tube, an intermittently operable electric heating resistor.It is known to heat the capillary tube or a conduit section immediately upstream thereof by means of an electric heating resistor, to evaporate the refrigerant that is there located and in this way to produce a vapour plug which is practically impossible to discharge through the capillary tube. With the aid of the heating resistor, therefore, the downstream evaporator can be made inoperative by means of the refrigerant supply. This is utilised to regulate the temperature in a refrigerated compartment independently of the control of the compressor or to relieve the evaporator when the latter is to be defrosted with the aid of an additional defrosting device.In the known cases, the heating resistor has a constant heat output and is disposed beyond the capillary tube or the refrigerant conduit. However, this results in the disadvantage that, after the refrigerant has evaporated, an excessive heat output is available that leads to an excessive temperature rise and permits coking of the refrigerant oil that is initially dissolved in the refrigerant and has been released by the evaporation. Since this coking takes place in the capillary tube or immediately upstream thereof, blockages of the capillary tube are unavoidable.The invention is therefore based on the problem of providing a compressor refrigerator plant of the aforementioned kind in which there is no fear of a blockage of the capillary tube by carbonized oil.This problem is solved in accordance with the invention in that a chamber is provided upstream of at least a section of the capillary tube and that the electric heating resistor is a PTC resistor which is disposed in the chamber and which goes over from a low to a high resistance when a temperature range is exceeded between the evaporating temperature of the refrigerant associated with the pressure in the chamber and the coking temperature of the refrigerant oil.With this arrangement, the heating resistor is disposed in the refrigerant and therefore has the same temperature as the refrigerant. Since the heatng resistor is a PTC resistor, its resistance increases with a rise in temperature and its power output drops accordingly. There are markedly different resistances to both sides of a temperature range; with many PTC resistors, a surge of resistance is associated with a particular temperature. When the PTC resistor is switched on, therefore, an equilibrium temperature is set up at which the refrigerant can evaporate but the refrigerant oil cannot become coked. There is therefore no danger of blocking the capillary tube.As in known cases, such an apparatus can be used as a `switch` for the refrigerant in so far that the downstream capillary tube section is so dimensioned that it is permeable to liquid refrigerant but is practically impermeable to the refrigerant vapour produced in the chamber.In this way it is possible to control a refrigerant cabinet with two compartments of different temperature having their evaporators connected substantially in parallel and fed by a common compressor and condenser, in so far that a thermostat in the compartment of lower temperature controls the compressor and a thermostat in the compartment of higher temperature controls a switch for the PTC resistor.The fact that the PTC resistor tends to ensure a substantially uniform temperature in the chamber when it is operative also permits a very simply constructed defrosting apparatus to be provided which dispenses with expensive accessories such as magnetic valves for hot gas, special heating conduits at the evaporator, and the like. Such a defrosting apparatus is characterised in that the chamber is disposed between two capillary tube sections and the second capillary tube section is dimensioned so that it has a lower throttling resistance to the liquid refrigerant than does the first capillary tube section. In particular, it can be dimensioned so that the second capillary tube section offers substantially the same resistance to refrigerant vapour as both sections do to liquid refrigerant. This can be achieved in that, for the second capillary tube section, its length is selected to be shorter than for the first capillary tube section and/or its cross-section is selected to be larger. In this case, when the PTC resistor is operative it will continuously convert liquid refrigerant to superheated refrigerant vapour in the chamber. In vapour is throttled in its flow into the evaporator and effects defrosting. With the dimensions as stated, it is even possible to ensure that, during defrosting, the pressure in the evaporator is substantially the same as the evaporator pressure during normal operation.It is particularly favourable if there is a functional relationship between the compressor and the PTC resistor such that the compressor is at least temporarily functioning during defrosting. In this way the compressor sucks off the refrigerant vapour fed into the evaporator. The low suction also ensures that no excessively high evaporator pressures occur. At the same time, the condenser is filled so that, after defrosting, the original temperature can be rapidly re-establishd in the refrigerated space.This functional relationship may be given in many ways. For example, the switch for the PTC resistor can also energise the compressor motor. However, the defrosting circuit can also be coupled to the compressor circuit in any other manner, either mechanically, electrically or thermally. A very simple solution is obtained if the PTC resistor is operable deliberately or automatically, e.g. in response to the presence of a layer of frost on the evaporator, and the compressor is controllable by a thermostat in the refrigerated space. Switching on of the PTC resistor can be controlled manually, by a time clock, by a temperature sensor or the like. In each case, the subsequent interruption in the supply of the liquid refrigerant leads to heating of the refrigerated space which, in turn, allows the compressor to start by way of the thermostat.
    • 压缩机制冷设备技术领域本发明涉及一种压缩机制冷设备，其包括在冷凝器和蒸发器之间的节流装置，并且与节流装置相关联地具有间歇可操作的电加热电阻器，腔室设置在节流装置的至少一部分的上游， 加热电阻器是设置在室中的PTC电阻器，并且当超过与室内压力相关联的制冷剂的蒸发温度和制冷剂油的焦化温度之间的温度范围从低到高转变为 高阻力。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 98. 发明授权
      US3854915A Demand defrost control system 失效
    • Demand defrost control system
    • 需求缺陷控制系统
    • US3854915A
    • 1974-12-17
    • US34969073
    • 1973-04-10
    • AMF INC
    • SCHULZE BERGE K , ALLARD J
    • F25D21/08 , F24F11/02 , F25D21/00 , F25D21/06
    • F25D21/002
    • A demand defrost system is provided in which a periodic switch device is driven at variable speed in response to relative humidity values ambient to one or more refrigeration units. The periodic switch device initiates defrost cycles in the refrigeration units at variable periodic intervals under the demand constraint of relative humidity. The refrigeration units are controlled by individual constant speed timers which control the maximum period of a given defrost cycle and terminate the cycle early if defrost criterion is satisfied prior to the end of the maximum interval. These timers slave themselves to the periodic switch device to readily receive defrost initiation commands therefrom and include by-pass means to selectively permit real time control of the defrost cycles.
    • 提供了一种需求除霜系统，其中周期性开关装置响应于一个或多个制冷单元周围的相对湿度值以可变速度被驱动。 周期性开关装置在相对湿度的需求约束下以可变的周期性间隔开始制冷单元中的除霜循环。 制冷单元由单独的恒定速度定时器控制，控制给定除霜循环的最大周期，并且在最大间隔结束之前满足除霜标准，提前终止循环。 这些定时器自身从属于周期性开关装置以容易地从其接收除霜启动命令，并且包括旁通装置以选择性地允许除霜循环的实时控制。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 99. 发明授权
      US3845637A Defrost cycle initiation system 失效
    • Defrost cycle initiation system
    • DEFROST循环启动系统
    • US3845637A
    • 1974-11-05
    • US39494773
    • 1973-09-06
    • TEXAS INSTRUMENTS INC
    • SHEPHERD G
    • F25D17/06 , F25D21/00 , F25D21/02 , F25D21/06
    • F25D17/065 , F25D21/002 , F25D21/02 , F25D2317/067 , F25D2400/04
    • A defrost cycle initiation system for refrigeration apparatus (e.g., a refrigerator, a refrigerator-freezer, or a room air conditioner) in which operation of the defrost system is initiated by frost build-up on the refrigeration apparatus. Generally, the refrigeration apparatus has cooling means for absorbing heat from a refrigerated zone, this cooling means being subject to the build-up of frost. The refrigeration apparatus has a main flow path for the intake of air from the refrigerated zone and for passage of the air over the cooling means to chill the air, and for discharge of the chilled air into the refrigerated zone, and a blower for forcing air through the main flow path. The defrost cycle initiation system of this invention includes an auxiliary flow path providing communication between the main flow path and the refrigerated zone, air normally flowing in the auxiliary flow path from the refrigerated zone to the main flow path when the refrigeration apparatus is in its normal mode of operation. The system further includes means for sensing the temperature of air flowing through the auxiliary flow path. The sensing means initiates a defrost cycle upon sensing a predetermined initiation temperature of air. Means are also provided for effecting reversal of flow of air in the auxiliary flow path in response to build-up of frost on the cooling means thereby to direct air having a temperature less than the abovementioned predetermined initiation temperature through the auxiliary flow path to lower the temperature of the air sensed by the sensing means below the predetermined temperature and for reestablishing the flow of air in the auxiliary flow path from the refrigerated zone to the main flow path upon the clearing of the cooling means of frost.
    • 一种用于制冷装置（例如，冰箱，冰箱或冰箱或室内空调）的除霜循环启动系统，其中除霜系统的操作由制冷装置上的霜积聚开始。 通常，制冷装置具有用于从冷藏区吸收热量的冷却装置，该冷却装置受到霜的积聚。 制冷装置具有用于从冷藏区域吸入空气并使空气在冷却装置上通过的主流路，以冷却空气，并将冷空气排放到冷藏区域中，并且用于迫使空气 通过主流路。 本发明的除霜循环引发系统包括辅助流路，其在主流路和冷藏区之间连通，当制冷装置处于正常状态时，在从冷藏区到主流路的辅助流路中正常流动的空气 操作模式。 该系统还包括用于感测流过辅助流动路径的空气的温度的装置。 感测装置在感测到空气的预定起始温度时启动除霜循环。 还提供了用于响应于冷却装置上的霜的积聚而实现辅助流路中的空气流反转的装置，从而通过辅助流动路径将温度小于上述预定起始温度的空气引导到 将由感测装置感测的空气的温度降低到预定温度以下，并且在清除冷却装置之后重新建立从冷藏区到主流路的辅助流路中的空气流。
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