Daikin Industries, Ltd.

Takeo Ueno

Masaaki Takegami

Kenji Tanimoto

Azuma Kondou

Kazuyoshi Nomura

Shouhei Yasuda

Satoru Sakae

Takahito Nakayama

Kouichi Kita

Toshihiro Iijima

Akitoshi Ueno

Hiroto Nakajima

Satoru Ohkura

Ryouji Matsue

Akihiro Kajimoto

Keisuke Nakatsuka

Masaki Yamamoto

Kenji Miyata

Toshiaki Mukaidani

Koichi Kita

Tetsuya Suda

Shunsuke Touya

Noriyasu Kawakatu

Yuuya Seta

Hideki Tsujii

Shinichi Oka

Chiharu Tomita

Yuuji Yamanaka

Takamasa Itou

Kazuhiko Nishihara

An icemaking system includes: a refrigerant circuit that executes a vapor compression refrigeration cycle; a circulation circuit that circulates solution as a cooling target of the refrigerant circuit; and a control device that controls refrigerant evaporation temperature at the refrigerant circuit. The circulation circuit includes a solution flow path of: an ice generator; a solution tank that stores the solution; and a pump that pressure feeds the solution to the solution flow path. The refrigerant circuit includes: an evaporator of the ice generator; a compressor; a condenser; and an expansion valve. The control device includes a central processing unit (CPU) that adjusts to lower evaporation temperature at the evaporator as the solution has higher solute concentration.

Icemaking system and a method of controlling evaporation temperature referred to by the icemaking system

An ice making system includes: a refrigerant circuit that performs a vapor compression refrigeration cycle and that includes a compressor, a condenser that condenses refrigerant discharged from the compressor, a first expansion valve with an adjustable opening degree that decompresses the refrigerant from the condenser, a flooded evaporator that evaporates the refrigerant decompressed by the first expansion valve, and a superheater that imparts a degree of superheating to the refrigerant discharged from the flooded evaporator; a circulation circuit that circulates a medium that is cooled by the flooded evaporator; and a control device that controls the adjustable opening degree of the first expansion valve such that the superheater imparts to the refrigerant discharged from the flooded evaporator a degree of superheating at which dryness of the refrigerant is kept within a predetermined range of less than 1.

Ice making system with controlled dryness of refrigerant

A double pipe icemaker includes an inner pipe, and an outer pipe provided radially outside the inner pipe and coaxially with the inner pipe. The outer pipe allows a cooling target to flow in the inner pipe and a refrigerant to flow in a space between the inner and outer pipes. The outer pipe has a wall provided with at least one nozzle to jet the refrigerant into the space. The nozzle has a jet port. The jet port may allow the refrigerant to jet in a radial direction including at least an axial direction and a circumferential direction of the inner pipe. A shielding plate may be provided ahead of the jet port in a jetting direction such that the refrigerant hitting the shielding plate expands along a surface of the shielding plate in a radial direction.

Double pipe icemaker

An icemaking system includes a circulation circuit configured to circulate icemaking solution, at least one icemaker provided in the circulation circuit, a cooling mechanism, a first detector and an adjuster. The icemaker includes a cooling chamber and a scraping mechanism. The cooling chamber has an inflow port and an exhaust port of solution, and the cooling chamber allows the solution to flow in the cooling chamber. The scraping mechanism scrapes ice generated on an inner surface of the cooling chamber. The cooling mechanism cools the solution in the cooling chamber. The first detector detects whether the inflow port of the cooling chamber has an ice nucleus. The adjuster adjusts a cooling temperature of the solution in accordance with a detection result of the first detector.

Icemaking system and icemaking method

an ice making system includes a tank that stores a medium to be cooled, an ice making machine that cools the medium and makes ice, a pump that circulates the medium between the tank and the ice making machine, a de-icing mechanism that heats the medium and melts the ice in the ice making machine, and a control device that controls operations of the ice making machine, the pump, and the de-icing mechanism. The ice making machine includes a cooling chamber that cools the medium, an inflow port through which the medium flows into the cooling chamber, and a discharge port through which the medium is discharged from the cooling chamber. The control device activates the de-icing mechanism when a pressure difference between a pressure of the medium at the inflow port and a pressure of the medium at the discharge port exceeds a predetermined value.

Ice making system

An ice making system includes: a tank that stores a medium to be cooled; an ice making machine that cools the medium and makes ice; a pump that circulates the medium between the tank and the ice making machine; a de-icing mechanism that performs a de-icing operation of heating and melting the medium in the ice making machine; and a control device that controls operations of the ice making machine, the pump, and the de-icing mechanism. The ice making machine includes: a cooling chamber in which the medium is cooled; a blade mechanism that rotates in the cooling chamber and disperses the ice; a detector that detects a locked state of the blade mechanism; and a first temperature sensor that is disposed at a discharge port of the cooling chamber and detects a temperature of the medium discharged from the cooling chamber.

A refrigeration apparatus () is provided with a refrigerant circuit (E) along which are connected a compressor (), an outdoor heat exchanger (), an expansion mechanism, an indoor heat exchanger () for providing room air conditioning, and a cooling heat exchanger () for providing storage compartment cooling. The refrigerant circuit (E) includes a discharge side three way switch valve () for varying the flow rate of a portion of the refrigerant which is discharged out of the compressor () and then distributed to the indoor heat exchanger () and the outdoor heat exchanger () during a heat recovery operation mode in which the indoor heat exchanger () and the outdoor heat exchanger () operate as condensers. As a result of such arrangement, even when the amount of heat obtained in the cooling heat exchanger () exceeds the amount of heat required in the indoor heat exchanger (), surplus heat is discharged without excessive decrease in the discharge pressure of the compressor ().

Refrigeration apparatus

In a refrigerant circuit (), a refrigerator circuit () and a freezing circuit () are connected in parallel to an outdoor circuit (). In the freezing circuit (), a freezer circuit () and a booster circuit () are connected in series. A booster compressor () and a four-way switch valve () are provided in the booster circuit (). During the time when a freezer heat exchanger () performs cooling operation for cooling the inside air, refrigerant evaporated in the freezer heat exchanger () is compressed in the booster compressor (), and then, is sucked into a variable capacitance compressor (). On the other hand, during defrosting of the freezer heat exchanger (), the refrigerant evaporated in a refrigerator heat exchanger () is compressed in the booster compressor (), and then, is supplied to the freezer heat exchanger (). The refrigerant condensed in the freezer heat exchanger () during the defrosting operation is sent back to the refrigerator heat exchanger ().

Freezing device

In the case where a 100 percent heat recovery operation mode is performed without using an outdoor heat exchanger in a refrigeration apparatus which is provided with utilization-side heat exchangers of a plurality of piping systems and in which liquid-side communication lines are arranged into a single line, a backflow prevention mechanism () for preventing liquid refrigerant exiting an indoor heat exchanger () from flowing in a direction other than in the direction of cold storage and freeze storage heat exchangers () is disposed for providing stable flow of refrigeration through the circuit even when the temperature of outside air is low, whereby the capability to provide refrigeration is prevented from degrading.

In a refrigerating apparatus comprising a plurality of application-side heat exchangers (), () for air-conditioning and for cold-storage/freezing, it is configured so as to be capable of corresponding to various types of operation patterns when a compression mechanism () is configured by two compressors (A,B). In order to continue operation even if one compressor is broken, a switching mechanism such as a four-way selector valve (C) is provided on the suction side of the two compressors (A,B), so that a plurality of operation patterns can be performed in a predetermined operation mode.

Refrigeration equipment

In a refrigerating apparatus () having application-side heat exchangers () for a plurality of systems for air-conditioning, for cold-storage/freezing and the like and a four-way switch valve (C) and a plurality of check valves () on suction sides of compression mechanisms (D,E) and formed from three compressors (A,B,C) to allow the operation states to be switched, the number of compressors (A,B,C) used at air-conditioning side and cold-storage/freezing side is limited to two at maximum, thereby achieving a simple circuit configuration in which the number of the check valves () to be provided in the suction sides of the compression mechanisms (D,E) is reduced to one or two, suppressing the occurrence of chattering noise in check valves () and, also, preventing an ability from reducing due to a suction-side pressure loss.

Freezer

A refrigeration system includes a chiller unit and a freezer unit. The freezer unit is provided with a freezing compressor for compressing a refrigerant in a total of two stages together with a compressor in an outdoor unit. The freezing compressor is formed by an inverter compressor. An oil separator is disposed on the discharge pipe of the freezing compressor. On the inlet pipe of the freezing compressor, a heat exchanger is provided for cooling an inverter with an refrigeration oil separated by the oil separator and a suction refrigerant.

Refrigeration system

An object of the present invention is to continue operation as it is without inducing any degradation of performance of a compressor even if one of compressors is broken down in a refrigeration apparatus which can freely cool or warm the inside of a room, cool a refrigerating show case and cool a freezing show case. A refrigeration apparatus ( ) comprises a non-inverter compressor ( A), a first inverter compressor ( B) and a second inverter compressor ( C). If the first inverter compressor ( B) is broken down during a cooling/freezing operation in which a cooling operation is performed by an inside heat exchanger ( ), a refrigerating heat exchanger ( ) and a freezing heat exchanger ( ), the operation is continued by opening a solenoid valve ( ) disposed on a first sub pipe ( ).

A two-stage cascade refrigerating system including a primary side refrigerant circuit, and at least one secondary side refrigerant circuit. The receiver of the primary refrigerant circuit is arranged such that a first pipe is introduced to the inside of the container such that an open of the first pipe is located at an inside upper portion of the container, and a second pipe is introduced to the inside of a container such that an open end of the second pipe is located at an inside lower portion of the container. The receiver of the secondary side refrigerant circuit(s) is reversible in refrigerant circulation and is arranged such that a first pipe and a second pipe are introduced to the inside of the container such that open ends of both pipes are located at an inside lower position of the container.

Two-refrigerant refrigerating device

The refrigerating system includes a low stage side refrigerant circuit ( ) formed by connecting a low stage side compressor ( ), a cascade condenser ( ), a low stage side receiver ( ), a low stage side expansion valve ( ) formed of a temperature-sensitive expansion valve and an evaporator ( ) in this order. The system also includes a high stage side refrigerant circuit ( ) formed by connecting a high stage side compressor ( ), a condenser ( ), a high stage side receiver ( ), a high stage side expansion valve ( ) formed of a motor-operated expansion valve and the cascade condenser ( ) in this order. The opening of the high stage side expansion valve ( ) is adjusted so that the pressure sensed by a high-pressure sensor (SPH ) for sensing the high pressure in the low stage side refrigerant circuit ( ) reaches a predetermined target high pressure.

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Osaka, Japan

Takeo Ueno