34results about How to "Extended defrost cycle" patented technology

The heat pump type air-cooled air conditioner utilizing the afterheat of compressor includes mainly refrigerant loop comprising compressor, outdoor heat exchanger, throttle unit and indoor heat exchanger; and outdoor blower capable of changing its rotation direction in winter. In winter and while the room is heated, the outdoor blower rotates in reverse direction, so that air from outdoor flows first through the compressor to exchange heat with the compressor casing to raise temperature and then through outdoor heat exchanger to exchange heat with refrigerant. The present invention recoversthe heat of compressor to raise the air intake temperature, improve the low temperature working performance of the air conditioner and the winter operation performance of the air conditioner.

The invention relates to an air conditioner, especially the air-cooled heat pump air conditioner heating system and the control method. Aiming at the shortage that outdoor coil pipe of air-cooled heat pump air conditioner is frosted easily so as to influence heating efficiency the invention discloses an air conditioner with inner-placed heating device. In heating mode, air-liquid separator is heated so as to prolong defrosting period, shorten defrosting time and improve heating efficiency of heat pump air conditioner. The air-cooled heat pump air conditioner comprises air-liquid separator. It is characterized in that it also comprises electric heating device, which is used to heat said air-liquid separator. The invention also provides the operating control method for the air conditioner. In the invention, defrosting period is prolonged; defrosting time is shortened; and synthesis heating quantity and energy efficiency ratio of heat pump air conditioner are improved.

The invention provides a heat pump air-conditioning system and a control method of the heat pump air-conditioning system. The heat pump air-conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device, an outdoor heat exchanger and a second throttling device. The outdoor heat exchanger comprises a main heat exchanger and a defrosting heat exchanger. The defrosting heat exchanger is located on the air flowing upstream side of the main heat exchanger. The second throttling device is connected with the defrosting heat exchanger in series to form a defrosting pipeline. When the heat pump air-conditioning system is under a heating working condition, refrigerant starts from an exhaust opening of the compressor, passes through the indoor heat exchanger and the first throttling device and then is divided into two branches; one branch flows back into the compressor via the main heat exchanger, and the other branch is throttled by the second throttling device, enters the defrosting heat exchanger and then flows back into the compressor. According to the heat pump air conditioning system, the frosting frequency of the main outdoor heat exchanger in the heat pump air conditioning system can be lowered, the heat pump air conditioning system can be under normal heating work condition for a long time, and the work energy efficiency of the heat pump air conditioning system is improved.

This invention relates to a direct freezing refrigerator, which comprises box body with cold room, the heat exchange panel whose bottom has a certain batter to discharge condensation water, dividing the cold room to a certain space, and coolant pipe setting in the heat exchange panel in back and forth bending form. By setting heat exchange panel or flow guiding unit, it can discharge condensation water quickly. Said structure can decrease the condensing time, besides, it can prolong the defrost cycle and decrease the electric consumption of refrigerator.

Cooler (107) provided on the back surface side of a refrigerator, the cooler for generating cool air, defrosting heater (132) provided below cooler (107), and cooler cover (120) having cool air return port (135) are provided. Center of defrosting heater (132) is set on the upper side of a lower surface of a freezing compartment, projection member (136) protruding into the interior side is arranged on the lower surface of the freezing compartment, and a lower end of cool air return port (135) and an upper end of projection member (136) are overlapped with each other in the height direction.

The present invention relates to a refrigerator with prefrosting function. It includes a box body, said box body at least has a cooling chamber, and the interior of said box body is equipped with a cooling air-circulating channel for cooling chamber, and the evaporator of cooling air is placed in the circulating channel. In order to inhibit frost formation of evaporator a prefrosting component formed by using metal component is placed in said refrigerator, said prefrosting component is mounted in the front of evaporator in the cooling air circulating process. Said invention can reduce frost formation of evaporator, the cooling air anjd evaporator can be mutually fully contacted, so that it can raise heat exchange efficiency, and also can prolong the defrosting cycle of evaporator.

The evaporator defroster includes mainly heat absorbing end on the outer surface of compressor casing, heat releasing end on the outer surface of the outdoor heat exchanger and season switch installed between the heat absorbing end and the heat releasing end. During the heating operation in winter, the season switch is closed, the heat absorbing end absorbs heat from the compressor casing beforethe heat releasing end transmits heat to the outer wall of the outdoor heat exchanger with relatively low temperature to inhibit the formation and accumulation of frost. The present invention recovers the afterheat of the compressor during heating operation and is favorable to raising the winter performance index of air conditioner.

The invention provides a heat pump air conditioning system and a control method thereof. The system comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device, a second throttling device, a main heat exchanger and a defrosting heat exchanger, the defrosting heat exchanger is located on the air flowing upstream side of the main heat exchanger, and the second throttling device and the defrosting heat exchanger are connected in series to form a defrosting pipeline. Under the heating working condition, a refrigerant passes through the indoor heat exchanger, the first throttling device and the main heat exchanger from an exhaust port of the compressor, is throttled by the second throttling device, enters the defrosting heat exchanger after being throttled by the second throttling device, and then flows back to the compressor. A refrigerant heating device is arranged on at least one of the exhaust pipeline, the air suction pipeline and the defrosting pipeline of the compressor. According to the heat pump air conditioning system, the frosting frequency of the main outdoor heat exchanger can be reduced, the heat input of a refrigerant of the whole system can be enhanced, the heating duration is prolonged, and continuous indoor heat supply is achieved in the defrosting period.

The invention provides a heat pump air conditioning system and a control method thereof. The system comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device, a second throttling device, a main heat exchanger and a defrosting heat exchanger, the defrosting heat exchanger is located on the air flowing upstream side of the main heat exchanger, and the second throttling device and the defrosting heat exchanger are connected in series to form a defrosting pipeline. Under the heating working condition, a refrigerant passes through the indoor heat exchanger, the first throttling device and the main heat exchanger from an exhaust port of the compressor, is throttled by the second throttling device, enters the defrosting heat exchanger after being throttled by the second throttling device, and then flows back to the compressor. A refrigerant heating device is arranged on at least one of the exhaust pipeline, the air suction pipeline and the defrosting pipeline of the compressor. According to the heat pump air conditioning system, the frosting frequency of the main outdoor heat exchanger can be reduced, the heat input of a refrigerant of the whole system can be enhanced, the heating duration is prolonged, and continuous indoor heat supply is achieved in the defrosting period.`.

The invention provides a refrigerator. The refrigerator comprises a refrigerator body and a cooler. At least one storage room and an air channel are arranged in the refrigerator body. The cooler is arranged in the air channel, so that the cooler and air flowing through the cooler carry out heat exchange. Specially, the air channel is configured to allow part or all of air from the interior of one or more storage rooms in the storage rooms to flow around the cooler and be mixed with air flowing through the cooler at the downstream position of the cooler. Due to the special structure of the air channel, the refrigerator enables part of air for circulation not to be cooled by the cooler, the air is mixed with the air flowing through the cooler at the downstream position of the cooler so that refrigeration temperature can be achieved, and moisture in air which is not cooled by the cooler can continue to return to the corresponding storage rooms. Therefore, moisture in a refrigeration room can be prevented from being lost or being lost too fast in the refrigeration process, air humidity of the refrigeration room is guaranteed, and food freshness retaining is facilitated.

The invention discloses a self-adaptive defrosting control method of an air-cooled heat pump system. The self-adaptive defrosting control method is characterized by comprising the following steps of:setting four control parameters: (1) setting a defrosting time set value; (2) setting a temperature difference value entering a defrosting cycle; (3) setting a fin temperature exiting the defrosting cycle; and (4) setting an interval time (defrosting cycle) of two defrosting cycles, comparing actual defrosting time with set defrosting time, recording a ratio of the actual defrosting time to the set defrosting time each time, setting an interval according to a ratio range, determining a defrosting interval time according to an interval range to which the defrosting interval time belongs, takingtwo times of defrosting time as a correction interval, adjusting the set value of the defrosting interval time according to two defrosting time intervals recorded by the current times and the previous times, and continuously correcting the defrosting cycle to enable the defrosting cycle to automatically adapt to the change of the temperature and humidity of the environment with a self-correctionvariable step length.

The invention discloses a heat pump system. The heat pump system comprises a compressor (1), a hot water heat exchanger (2), a throttling device (3), an outdoor heat exchanger (4), a water tank (7) and a circulating water pump (8), wherein the compressor (1), the hot water heat exchanger (2), the throttling device (3) and the outdoor heat exchanger (4) are arranged in sequence in a refrigerant circulation loop, and the water tank (7) and the circulating water pump (8) are arranged in sequence in a water loop. The system further comprises a heat exchanger (10), a refrigerant bypass pipe (11) and a hot water bypass pipe (12). The heat exchanger absorbs operation waste heat of the compressor and heats circulating media in the refrigerant bypass pipe and the water bypass pipe. The inlet end of the refrigerant bypass pipe is connected to the outlet end of the throttling device in a switched mode through a refrigerant reversing valve (5). The outlet end of the refrigerant bypass pipe is connected with the inlet end of the outdoor heat exchanger. The inlet end of the hot water bypass pipe is connected to the outlet end of the circulating water pump in a switched mode through a hot water reversing valve (6). The outlet end of the hot water bypass pipe is connected with the inlet end of the hot water heat exchanger. The heat pump system can use the operation waste heat of the compressor to defrost and preheat water, so that the operation waste heat of the compressor is used more fully.

The invention provides a method for reducing frost of a chamber. The method includes the step that water vapor in the refrigerator chamber is guided out of the refrigerator chamber in one direction, in other words, the water vapor is only allowed to be transmitted out of the refrigerator chamber. The frost amount in the refrigerator chamber is reduced, and the frost removing cycle is prolonged.