Refrigerating device with automatic defrosting function

FIELD: household appliances.

SUBSTANCE: refrigerating device, in particular, household refrigerating device, contains coolant circulation loop with compressor, evaporator and shutoff valve between compressor outlet and evaporator inlet, evaporator defrosting heating device and control unit, intended for evaporator defrosting preparation by compressor operation with closed shutoff valve. Heating device is installed on evaporator. Refrigerating device operating method, which contains coolant circulation loop with compressor, evaporator and shutoff valve between compressor outlet and evaporator inlet, includes following stages: compressor operation with open shutoff valve, compressor disconnection, evaporator heating.

EFFECT: using this group of inventions provides increase in device energy efficiency.

10 cl, 3 dwg

 



 

Same patents:

FIELD: heating.

SUBSTANCE: evaporator module for refrigerating devices, in particular for household refrigerating devices, comprises an evaporator with tubing through which the coolant flows, and a set of plates that are in heat-conducting contact with this tubing, and the tubular heating device intended for thawing of the evaporator. The heating device, at least, by sections contacts the plates. The section of the heating device, at least, by its most part passes along edge area of intermediate space.

EFFECT: use of this invention allows to provide fast thawing of the evaporator at low temperature gradient between the heating device and the tubing for coolant with plates.

12 cl, 6 dwg

FIELD: heating.

SUBSTANCE: refrigerating unit, and namely a domestic refrigerator includes an evaporator, which has the possibility of periodic defrosting by means of a defrosting device that is switched off with a temperature sensor located near the evaporator when the specified temperature is achieved or the specified duration of a process is elapsed. Defrosting device is made so that it can develop at least two different defrosting temperatures according to the specified defrosting temperature chart during defrosting process. Defrosting temperature chart includes the first section with the first constant defrosting temperature, an intermediate section of defrosting temperature, which follows the first section, and the third section with the second constant defrosting temperature, which follows the intermediate section. A control method of the refrigerating unit defrosting process involves the following stages: generation of the first constant defrosting temperature with the first temperature level during the first period, variation of the first defrosting temperature till the second temperature level during the second period, which follows the first period; maintenance of the second temperature level as the second constant defrosting temperature during the third period, which follows the second period.

EFFECT: uniform evaporator defrosting.

10 cl, 2 dwg

FIELD: personal use articles.

SUBSTANCE: refrigerating unit comprises a storage chamber and an evaporation chamber, which is connected to the storage chamber via an air duct of cold air and an air duct of hot air, an evaporator and a defroster. The defroster in the area arranged near the air duct of hot air has higher density of heating capacity compared to the area arranged near the cold air duct.

EFFECT: application of this invention makes it possible to achieve even distribution of temperature, which is only slightly higher than the freezing point, in the evaporating chamber.

12 cl, 4 dwg

FIELD: personal use articles.

SUBSTANCE: refrigeration device without frost buildup comprises evaporator, tubular heater and carrier, which carries evaporator and tubular heater. Tubular heater includes multiple parallel sections. Sections are joined to each other as a whole. Beginning and end of tubular heater are located at two directly neighbouring parallel sections.

EFFECT: convenient storage of large quantity of cooled products.

7 cl, 6 dwg

FIELD: personal use articles.

SUBSTANCE: refrigerator comprises body and a couple of doors, which are attached on opposite sides of body and limit the first inner chamber together. The first door of a couple carrier a pad, which in closed position of the first door enters the inner chamber. Pad has an adjacency surface, to which the back side of the second door adjoins in closed position of both doors. Pad comprises a heating device. On lighting jacket of inner chamber, which is mounted on body, there is a supply contact, through which electric heating device supply current circuit passes and which, with the first door closed, is galvanically joined to response contact of the first door.

EFFECT: simplified supply of current to electric heating device.

13 cl, 4 dwg

FIELD: heating.

SUBSTANCE: proposed device comprises at least one pipe for refrigerator coolant and cooling ribs in heat contact with coolant pipe. Note here that said pipes and/or ribs make resistive heater and at least switch to feed electric power to said resistive heater that generates heat for removal of ice from pipes and/or ribs.

EFFECT: minimum power consumed for ice removal from fringe surface.

49 cl, 35 dwg

FIELD: heating systems.

SUBSTANCE: cooling unit includes heat-insulated housing (1) enveloping cooling chamber (2), evaporator (7) installed in air channel (4, 5) interconnected with cooling chamber (2), heating device (8) for heating evaporator (7) and control diagram (10) to control operation of heating device (8). Control diagram (10) is connected to signal transmitting measuring device installed in air channel (4, 5) and characterising air flow passing through channel (4, 5), and is provided with possibility of switching on heater (8) when measured air flow decreases below some limit value. Measuring device has two temperature sensors installed in various proximity as to heat to heat source or to heat flux sink, or to air in channel (4, 5). Control diagram (10) has the possibility of determining air flow decreased below limit flow value when difference of temperatures measured with two sensors is beyond limit temperature difference value.

EFFECT: simplifying and improving cooling unit reliability.

5 cl, 5 dwg

FIELD: heating.

SUBSTANCE: invention relates to refrigerating machine with built-in heater (8) of defrost system, provided with measuring device (10, 12) for measuring voltage on feeding outlets (11) of defrost system heater (8) and for generation of modulated driving signal with mark-to-space ratio depending on measured voltage value. Interrupter (9) of current supplied to defrost system heater (8) is put into operation by driving signal. Mark-to-space ratio of feeding voltage changes depending on measured voltage in order to limit fluctuations of power of defrost system heater caused by voltage fluctuations.

EFFECT: efficiency of defrost system and increase of defrost system heater economy.

11 cl, 3 dwg

FIELD: mechanics.

SUBSTANCE: invention refers to automatics. The device includes power supply, timer, heater, defrosting finish sensor, compressor, voltage suppressor, first and second rectifiers, first and second extinguishing elements, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Timer inverting input is connected with power supply first pole through heater and with second fixed relay contact through defrosting finish sensor. Timer common leg is connected with power supply second pole. Timer output is connected with second fixed relay contact through two series-connected circuits. The first circuit is formed by relay winding and threshold element. The second circuit is formed by first rectifier and first extinguishing element. Common point of the first and the second circuits is connected with timer common leg through voltage suppressor and with first fixed relay contact through circuit of series-connected second rectifier and second extinguishing element (the third circuit). The first fixed relay contact is connected with power supply first pole through compressor. According to the second version the device includes power supply, timer, heater, defrosting finish sensor, compressor, voltage suppressor, first and second rectifiers, first and second extinguishing elements, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Timer common leg is connected with power supply second pole. Timer inverting input is connected with power supply first pole through heater and with second fixed relay contact through defrosting finish sensor. Timer output is connected with relay winding first output, the second output of which is connected with the second fixed relay contact through series-connected first rectifier and first extinguishing element. Common point of relay winding second output and circuit formed by series-connected first rectifier and first extinguishing element is connected with timer common leg through voltage suppressor and with fixed first relay contact through circuit of series-connected second rectifier and second extinguishing element. The first fixed relay contact is connected with power supply first pole through compressor. Timer is performed with additional control input connected with voltage suppressor. Additional control input provides the possibility for timer to receive a signal about power in the circuit after emergency shutdown.

EFFECT: structure simplification, increase of operation safety at the expense of decreasing the requirements for timer elements permissible work voltage, decrease of discrete elements quantity, facilitation of optimal version choice for certain conditions of use.

3 cl, 3 dwg

FIELD: mechanics.

SUBSTANCE: invention refers to automatics. Refrigerator defrosting timer includes power supply, timer, heater, defrosting finish sensor, compressor, rectifier, extinguishing element, voltage suppressor, threshold element, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Common leg of timer is connected with first fixed relay contact and through compressor - with power supply first pole. Timer inverting input is connected with second fixed relay contact through heater and with power supply first pole through defrosting finish sensor. Timer output is connected with second fixed relay contact through two series-connected circuits. On one side the first circuit is formed by series-connected relay winding and threshold element, on the other side the second circuit is formed by series-connected rectifier and extinguishing element. The first and the second circuit common point is connected with timer common leg through voltage suppressor. According to the second version the device includes power supply, timer, heater, defrosting finish sensor, compressor, rectifier, extinguishing element, voltage suppressor, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Common leg of timer is connected with first fixed relay contact and through compressor - with power supply first pole. Timer inverting input is connected with second fixed relay contact through heater and with power supply first pole through defrosting finish sensor. Timer output is connected with relay winding first output, the second output of which is connected with second fixed relay contact through series-connected rectifier and extinguishing element. Common point of relay winding second output and circuit formed by series-connected rectifier and extinguishing element is connected with timer common leg through voltage suppressor. Timer has additional control input connected with voltage suppressor. Timer receives a signal about power in the circuit after emergency shutdown through this additional input.

EFFECT: creation of refrigerator defrosting timer.

7 cl, 7 dwg

FIELD: heating.

SUBSTANCE: cooling system includes a compressor, a condenser, and an evaporator and a cooling agent that circulates in series from the compressor to the condenser, the evaporator and back to the compressor during the normal operation of the cooling system. The above method and device include shutoff of the cooling agent flow from the compressor to the evaporator through the condenser at continued operation of the compressor for application of the suction force to the cooling agent contained in the evaporator. Then, directions of compressed cooling agent from the compressor to the evaporator bypassing the condenser at continued shutoff of the cooling agent flow from the compressor to the evaporator through the condenser.

EFFECT: improvement of operating efficiency of the system.

14 cl, 1 dwg

FIELD: power engineering.

SUBSTANCE: defrosting method includes periodical supply of heat into an inner volume of an air cooler, creation and measurement of a directed through light flux in an interfin space of the air cooler. In process of commissioning after installation of the air cooler they measure the initial value of the light flux in the refrigerating chamber. Afterwards the refrigerating plant is started, and light flux variation is controlled as the air cooler operates in the refrigerating chamber in process of its reaching the specified temperature mode. The thickness of frost in the interfin space of the air cooler is monitored visually, and when the maximum permissible thickness of frost is achieved, the critical value of the light flux is measured and recorded, at which during further operation of the air cooler they supply heat into the inner volume of the air cooler. At the same time they monitor variation of the specified light flux, and whenever the light flux achieves the initial value, they stop heat supply.

EFFECT: using this invention makes it possible to reduce power inputs and time for thawing of air coolers during operation of air coolers.

5 dwg

FIELD: personal use articles.

SUBSTANCE: refrigerating machine is provided with a compressor (1), a condenser (2) and an evaporator (5) connected into the refrigerating circuit. On the way of the refrigerant from the condenser (2) to the evaporator (5) a shut-off valve (3) is integrated. The controller (6) closes the shut-off valve (3) when the compressor (1) is off and opens the shut-off valve (3) when the compressor (1) is on. Refrigerating machine is a household refrigeration apparatus. The controller (6) is configured so as the shut-off valve (3) can be both open and not open when the compressor (1) is off. The compressor (1) works intermittently and when the compressor (1) is off the shut-off valve (3) is closed and when the compressor (1) is on the shut-off valve (3) is open. To defrost the evaporator (5) the shut-off valve (3) is at least temporarily open when the compressor (1) is off.

EFFECT: increased efficiency of the refrigerating machine.

7 cl, 1 dwg

FIELD: power engineering.

SUBSTANCE: control facilities are made as capable of supplying a coolant cooled in a magnetic refrigerator into a cold heat exchanger in the mode of unit cooling. Control facilities are made as capable to switch off the magnetic refrigerator or to supply a coolant heated in the magnetic refrigerator into a cold heat exchanger in the unfreezing mode.

EFFECT: reduced time of unfreezing.

9 cl, 1 dwg

FIELD: refrigeration or cooling.

SUBSTANCE: method comprises connecting the first heat exchanger used for defreezing the compressor, second heat exchanger, and expanding device through pipelines to define united closed circuit so that, for the cycle of defreezing of the first heat exchanger, the gas coolant flows through the first heat exchanger virtually at the same pressure at which the gas coolant outflows from the compressor, so that the gas coolant flowing through the first heat exchanger heats the first heat exchanger thus providing its defreezing.

EFFECT: enhanced efficiency and .

20 cl, 11 dwg

Air cooler // 2256858

FIELD: air coolers.

SUBSTANCE: air cooler has cooling battery and tray. Electric heater is placed inside hollow space of the tray. Electric heater is made elastic to be snug against to the lower surface of top sheet and to be covered with insulation.

EFFECT: reduced time for thawing of air coolers; reduced consumption of energy for production of cold.

2 dwg

Air cooler // 2256858

FIELD: air coolers.

SUBSTANCE: air cooler has cooling battery and tray. Electric heater is placed inside hollow space of the tray. Electric heater is made elastic to be snug against to the lower surface of top sheet and to be covered with insulation.

EFFECT: reduced time for thawing of air coolers; reduced consumption of energy for production of cold.

2 dwg

FIELD: refrigeration or cooling.

SUBSTANCE: method comprises connecting the first heat exchanger used for defreezing the compressor, second heat exchanger, and expanding device through pipelines to define united closed circuit so that, for the cycle of defreezing of the first heat exchanger, the gas coolant flows through the first heat exchanger virtually at the same pressure at which the gas coolant outflows from the compressor, so that the gas coolant flowing through the first heat exchanger heats the first heat exchanger thus providing its defreezing.

EFFECT: enhanced efficiency and .

20 cl, 11 dwg

FIELD: power engineering.

SUBSTANCE: control facilities are made as capable of supplying a coolant cooled in a magnetic refrigerator into a cold heat exchanger in the mode of unit cooling. Control facilities are made as capable to switch off the magnetic refrigerator or to supply a coolant heated in the magnetic refrigerator into a cold heat exchanger in the unfreezing mode.

EFFECT: reduced time of unfreezing.

9 cl, 1 dwg

FIELD: personal use articles.

SUBSTANCE: refrigerating machine is provided with a compressor (1), a condenser (2) and an evaporator (5) connected into the refrigerating circuit. On the way of the refrigerant from the condenser (2) to the evaporator (5) a shut-off valve (3) is integrated. The controller (6) closes the shut-off valve (3) when the compressor (1) is off and opens the shut-off valve (3) when the compressor (1) is on. Refrigerating machine is a household refrigeration apparatus. The controller (6) is configured so as the shut-off valve (3) can be both open and not open when the compressor (1) is off. The compressor (1) works intermittently and when the compressor (1) is off the shut-off valve (3) is closed and when the compressor (1) is on the shut-off valve (3) is open. To defrost the evaporator (5) the shut-off valve (3) is at least temporarily open when the compressor (1) is off.

EFFECT: increased efficiency of the refrigerating machine.

7 cl, 1 dwg

FIELD: power engineering.

SUBSTANCE: defrosting method includes periodical supply of heat into an inner volume of an air cooler, creation and measurement of a directed through light flux in an interfin space of the air cooler. In process of commissioning after installation of the air cooler they measure the initial value of the light flux in the refrigerating chamber. Afterwards the refrigerating plant is started, and light flux variation is controlled as the air cooler operates in the refrigerating chamber in process of its reaching the specified temperature mode. The thickness of frost in the interfin space of the air cooler is monitored visually, and when the maximum permissible thickness of frost is achieved, the critical value of the light flux is measured and recorded, at which during further operation of the air cooler they supply heat into the inner volume of the air cooler. At the same time they monitor variation of the specified light flux, and whenever the light flux achieves the initial value, they stop heat supply.

EFFECT: using this invention makes it possible to reduce power inputs and time for thawing of air coolers during operation of air coolers.

5 dwg

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