Sanyo Electric Co., Ltd.

Other

Shigeya Ishigaki

Kenzo Matsumoto

Haruhisa Yamasaki

Masaji Yamanaka

Kentaro Yamaguchi

Kazuaki Fujiwara

Tsunehisa Yumoto

Hiroshi Mukaiyama

Tomohito Koizumi

Kiyoshi Koyama

Satoshi Imai

Hiroshi Nishikawa

Koji Sato

Norio Sawada

Osamu Kuwabara

Michihiro Kurokawa

Midori Futakawame

Masahiro Kobayashi

Hirokazu Izaki

Yoshio Watabe

Hideaki Mukaida

Kazuaki Shikichi

Tomohito Takada

Noriyuki Nabeshima

Yoshinori Toya

Norio Abukawa

Masanobu Saitoh

Yoshinori Touya

Sadahiro Takizawa

Masafumi Ueda

Katuyuki Tuno

Mikiyasu Sinnsi

Masanori Akutu

Takahiro Suzuki

Tsunehisa Yomoto

Kenzo Matsuomoto

There is provided a cooling apparatus which can improve a cooling efficiency while preventing an abnormal increase in pressure of a high side. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; a control device which controls a speed of rotation of the compressor between predetermined lowest and highest speeds; and a cooled state sensor which detects a cooled state in a refrigerator main body to be cooled by an evaporator included in the refrigerant circuit. The control device increases a highest speed of rotation of the compressor if a temperature in the chamber of the refrigerator main body detected by the cooled state sensor is low.

Cooling apparatus

There is provided a heating/cooling system capable of reducing power consumption. The heating/cooling system has a receiving room capable of using hot air and cold air in a switching manner, and comprises a refrigerant circuit which comprises a compressor, a gas cooler, a radiator, an expansion valve, an evaporator, and the like, in which carbon dioxide is sealed as a refrigerant, and whose high pressure side becomes supercritical pressure. The inside of the receiving room is heated by the radiator and cooled by the evaporator.

Heating/cooling system

A refrigerant systemD comprises a heat insulating housingprovided with an accommodating space inside and a refrigeration unitattached to a lower portion of the heat insulating housingin which a compressora gas cooleran internal heat exchangera restriction meansand an evaporatoraccommodated in a heat insulating caseA are disposed on a unit baseThe gas coolerand the heat insulating caseA are disposed so that air heat-exchanged by the gas coolermoves toward the heat insulating caseA, an air passage T is provided between the unit baseand the heat insulating caseA, the air heat-exchanged by the gas cooleris passed through the air passage T to be discharged outside, and the internal heat exchangeris disposed in such a manner that it is embedded in a heat insulating material layerC provided around the heat insulating caseA to be provided with a heat insulation property. Accordingly, exhaust heat-exchanged by the gas cooler is discharged outside without stagnation, and increases in an overload and operation power of the compressor are suppressed and the durability of the compressor can be improved. Further, the heat-exchanging efficiency of the internal heat exchanger can be improved and the generation of condensation on a surface of an outer side tube of the internal heat exchanger can be prevented.

Refrigerant system

There is provided a cooling apparatus which can prevent an abnormal increase in pressure of a high side at the time of starting. The cooling apparatus comprises: a refrigerant circuit which uses carbon dioxide as a refrigerant; and a control device which controls a speed of rotation for the compressor between predetermined lowest and highest speeds. The control device runs the compressor by holding a predetermined start-time holding speed of rotation lower than the lowest rotational speed for a predetermined time before the lowest rotational speed is reached after the compressor is started.

There is provided a cooling apparatus which can improve cooling efficiency of an evaporator while preventing freezing of articles housed in a cooled space thereof. The cooling apparatus comprises: a control device which controls a compressor; and a temperature sensor in the chamber which can detect a cooled state in a refrigerator main body to be cooled by the evaporator. The control device stops running of the compressor if the compressor is continuously run for a predetermined time, and changes the continuous running time of the compressor for stopping the same based on a temperature in the chamber of the refrigerator main body detected by the temperature sensor in the chamber.

It is an object of the present invention to provide a refrigerant cycle apparatus which can optimize the capability of releasing heat from a refrigerant in a gas cooler and an auxiliary heat exchanger under use conditions at a low cost. There are provided an intermediate cooling circuit which once releases heat from a refrigerant discharged from a compressor and then returns the refrigerant to the compressor, and a fan which ventilates an inter cooler of the intermediate cooling circuit and a gas cooler. The inter cooler has substantially the same ventilation area as that of the gas cooler.

Refrigerant cycle apparatus

There is disclosed a refrigerant cycle apparatus capable of avoiding occurrence of an abnormal rise in a pressure on a high-pressure side in advance, comprising: a throttling mechanism including a first capillary tube, and a second capillary tube which is connected in parallel to the first capillary tube and whose flow path resistance is smaller than that of the first capillary tube; and a valve device for controlling refrigerant circulation into the first and second capillary tubes, so that a refrigerant is passed into the second capillary tube at the time of starting of a compressor.

The present invention aims to prevent the occurrence of liquid compression at the second rotary compression element before it happens while improving the compression efficiency with an intermediate cooling circuit in a refrigerant cycle apparatus which comprises an internal high-pressure type multi-stage compression compressor, and the invention is summarized in that the apparatus comprises an intermediate cooling circuit which allows refrigerant discharged from the first rotary compression element of a compressor to dissipate heat, where a microcomputer performs control on the number of revolutions of the compressor to maintain the temperature/pressure of refrigerant so that the refrigerant does not condense at the output of the intermediate cooling circuit, where such a control is done in response to outputs from an outside-air temperature sensor, a refrigerant temperature sensor, and a signal from a controlling apparatus of a refrigerating apparatus body.

An object of the present invention is to provide a refrigerant cycle apparatus which can reduce a production cost while hastening equalization of pressure in a refrigerant circuit after a compressor is stopped, the apparatus comprises a bypass circuit which causes an intermediate-pressure area to communicate with a low-pressure side of a refrigerant circuit, a valve device provided to this bypass circuit and a control device which controls opening/closing of this valve device, and the control device constantly closes the valve device but opens it in order to release a flow path of the bypass circuit concurrently with the stop of the compressor.

A heat exchanger is provided in which high heat transfer efficiency has been attained by optimizing the slit array and setting an optimum range for the width of a slit and the spacing between slits. Slitsandformed in front of the heat transfer coiland slitsandformed behind the heat transfer coil are arranged so as to provide a mutually different length among adjoining partitioned slits in the vertical direction, as well as a mutually different length between directly opposite partitioned slits in the horizontal direction. As a result, the position at which the slit is partitioned is staggered.

Heat exchanger

An object is to improve cooling efficiency while preventing an abnormal increase in pressure of a high side in a cooling apparatus which uses so-called carbon dioxide as a refrigerant. The cooling apparatus comprises a refrigerant circuit in which a compressor, a gas cooler, pressure reducing means, an evaporator and the like are connected in an annular shape, and carbon dioxide is sealed as a refrigerant. In a stable running state in which a temperature of a space to be cooled by the evaporator is cool, time after a start of the compressor until a difference between outlet and inlet temperatures of the evaporator becomes within 1 degree is 5 minutes or more to less than 20 minutes.

Cooling apparatus and method for setting refrigerant sealing amount for the same

A heat pump type hot water supply apparatus ( ) for heating water by refrigerant heat and stocking the hot water thus achieved including: a heat pump unit ( ) having a refrigerant circuit using natural refrigerant, the refrigerant circuit including a compressor ( ) for compressing refrigerant, a heat-pump heat exchanger ( ) and a refrigerant-water heat exchanger ( ) for performing the heat exchange between refrigerant and water to achieve hot water; a hot water supply unit ( ) including a hot water supply tank ( ) for stocking the hot water achieved by the refrigerant-water heat exchanger ( ) of the heat pump unit ( ) and supplying the hot water thus stocked; and a water pipe ( ) through which the refrigerant-water heat exchanger ( ) of the heat pump unit ( ) and the hot water supply tank ( ) of the hot water supply unit ( ) are connected to each other to circulate hot-water/water between the refrigerant-water heat exchanger ( ) and said hot water supply tank ( ).

Heat pump type hot water supply apparatus

A number of vanes 12 are disposed in a peripheral direction of a plurality of supporting disks disposed along a rotary shaft 14 at given intervals. Each vane 12 is disposed at an angular interval as determined by a logistic representation. Thereby the intensity and variations of noise levels at around 8N on the low-frequency side, as well as the noise level caused by rotary first-order sounds, can be reduced.

Cross-flow fan and an air-conditioner using it

An air conditioner including at least two kinds of refrigerant which are circulated in a refrigerant circuit and have different characteristics, a calculator for calculating the driving capacity of a compressor in accordance with a request load of the refrigerant circuit and outputting a driving capacity signal representing the driving capacity, a driving unit for controlling the driving capacity of the compressor so as to obtain the driving capacity corresponding to the driving capacity signal of the calculator, and correcting means for correcting the driving capacity signal so as to reduce the driving capacity when the refrigerant pressure in the refrigerant circuit exceeds a first pressure value.

Growing community of inventors

Gunma, Japan

Shigeya Ishigaki