33results about "Refrigeration safety arrangement" patented technology

The present invention relates to a refrigeration or air-conditioning apparatus which utilizes a vapor compression refrigeration system having a refrigerant circulating therethrough that comprises a compressor powered by an engine exhaust gas driven turbine. A mini centrifugal compressor may advantageously be used with such an apparatus, thus allowing the use of low GWP refrigerants. The present invention further relates to methods for powering a compressor, such as a mini-centrifugal compressor, in a refrigeration or air-conditioning apparatus, and methods for controlling compressor surge, impeller speed and cooling capacity.

A capacity control algorithm for a multiple compressor liquid chiller system is provided wherein the speed and number of compressors in operation are controlled in order to obtain a leaving liquid temperature setpoint. In response to an increase in the load in the chiller system, the algorithm determines if a compressor should be started and adjusts the operating speed of all operating compressors when an additional compressor is started. In response to a decrease in the load in the chiller system with multiple compressors operating, the algorithm determines if a compressor should be de-energized and adjusts the operating speed of all remaining operating compressors when a compressor is de-energized.

A control system controls adaptively an operation of a vapor compression system. The control system includes a memory for storing a mapping relationship between control inputs of the vapor compression system, and a processor for executing a supervisory controller and an optimization controller. The supervisory controller controls the operation of the vapor compression system using a set of control inputs selected according to the mapping relationship. The optimization controller modifies the mapping relationship in response to the operation of the vapor compression system.

The invention relates to a cascade heat pump drying system and a control method thereof. The cascade heat pump drying system is composed of a high temperature stage loop and a low temperature stage loop. Refrigerating fluid R134a is used in the high temperature stage loop, and refrigerating fluid R744 is used in the low temperature stage loop. Operation of the high temperature stage loop and the low temperature stage loop can be controlled according to the environment temperature so that the system can work normally within the wide environment temperature range from -20 DEG C to 43 DEG C, and the use requirement can be met.

An apparatus for controlling an operation of compressors includes a single microcomputer for calculating stroke estimate values of multiple compressors based on voltage and current values applied to the multiple compressors, and generating a plurality of switching control signals for independently controlling a voltage applied to the multiple compressors based on the calculated stroke estimate values and pre-set stroke reference values; and switching devices each installed in the multiple compressors, for independently controlling the voltage applied to the multiple compressors according to the plurality of switching control signals. Since the reciprocating compressors are controlled by a single apparatus, costs and power consumption can be reduced.

The invention discloses a method, system and device of air injection of an air conditioning system and an air conditioner. The method comprises the following steps that the discharge temperature of a compressor and an adjusting parameter of an electronic expansion valve are obtained, and opening of the electronic expansion valve is adjusted according to the discharge temperature of the compressor and the adjusting parameter of the electronic expansion valve. The technical problem that in the prior art, the stability of air injection control and adjustment is low is solved.

The invention discloses a freezing device. When the opening of the electronic expansion valve (14) is less than the specified opening, or the superheat of the evaporator (15) is greater than the specified superheat, it is judged that the refrigerant circulation is insufficient, and the evaporator fan ( 22) The air volume is reduced.

The embodiments described herein include a control system and method for a compressor that is operable with a climate system. The control system enables optimal climate system operation by efficiently controlling the operating speed of the compressor.

A subcooling heat exchanger and subcooling expansion valve in a refrigeration system provide subcooling of a pre-subcooled portion, for refrigerating a thermal load, of condensed refrigerant liquid by a pre-subcooling portion of the condensed refrigerant liquid. The amount of subcooling of the pre-subcooled portion is determined by measuring, with a pressure sensor, refrigerating suction pressure exerted by refrigerating compressors of the system. A controller then controls, based on the refrigerating suction pressure, modulation of mass of pre-subcooling portion, relative pre-subcooled portion, and expansion thereof in the subcooling expansion valve, which controls the amount of refrigerant heat exchanged, and therefore subcooling of pre-subcooled portion, between the pre-subcooling portion and the pre-subcooled portion in the subcooling heat exchanger. The pre-subcooling portion is then subsequently compressed by a subcooling compressor.

The invention discloses an air-conditioner and a method for switching the working mode of the air-conditioner. The method solves the problem of high noise generated when the working mode of the air-conditioner is switched in the prior art. The air-conditioner comprises an indoor unit, an outdoor unit and a liquid pipe, a low-pressure air pipe, a low-pressure air pipe valve, a high-pressure air pipe and a high-pressure air pipe valve connected between the indoor unit and the outdoor unit; the air-conditioner also comprises a liquid pipe throttling device, a low-pressure air pipe throttling device and a high-pressure air pipe throttling device, wherein the liquid pipe throttling device is connected in series in the liquid pipe; the low-pressure air pipe throttling device is connected in parallel with the low-pressure air pipe valve; and the high-pressure air pipe throttling device is connected in parallel with the high-pressure air pipe valve. By using the technical scheme, the pressureof a coolant can be changed stably, and heat expansion and cold contraction effects are reduced, so that the noise generated when the working mode of the air-conditioner is switched is reduced.

The invention provides a temperature control device and a temperature control method. The temperature control device and the temperature control method are used for controlling the temperature of circulating liquid flowing through an external device. The temperature control device comprises a refrigerating device, a circulating liquid circuit unit and a controller. The refrigerating device comprises an evaporating device and a condensing device. The circulating liquid circuit unit comprises an electric three-way valve and a temperature sensor. The circulating liquid flows into the evaporating device and the condensing device via the electric three-way valve. When the temperature sensor senses that the temperature of the circulating liquid is higher than a set value, the controller controls the electric three-way valve to increase the proportion of the circulating liquid flowing through the condensing device, and when the temperature of the circulating liquid is lower than the set value, the proportion of the circulating liquid flowing through the condensing device is reduced. The temperature control device and the temperature control method have the advantages that control complexity due to the fact that two bypass circuits are adopted in order to prevent excessively high exhaust temperature of a compressor is avoided, and the purpose of saving energy is achieved owing to the fact that a refrigerating system of the compressor is omitted.

A compressor output calculation unit having a variable displacement compressor, a condenser, a pressure reducing mechanism and an evaporator, wherein a compressor torque or power is calculated based on a detected or estimated value of a refrigerant flow rate, a detected or estimated value of a refrigerant discharge pressure, a detected or estimated value of a refrigerant suction pressure, and a compressor rotational speed, and a control unit using the same. The compressor torque or power may be estimated at a high accuracy without using a refrigerant flow sensor.

The invention relates to a defrosting control method based on the opening degree of an electronic expansion valve. The method comprises the steps that the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition or the proportional relation between the reduction value and the opening degree of the electronic expansion valve under the non-frosting normal operation condition is taken as the condition for judging a defrosting starting action; when the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition reaches or exceeds the set difference value K, or the proportion between the reduction value of the current opening degree of the electronic expansion valve relative to the opening degree of the electronic expansion valve under the non-frosting normal operation condition and the opening degree of the electronic expansion valve under the non-frosting normal operation condition reaches or exceeds the set proportional value L, it is determined that the necessary condition or the necessary and sufficient condition of the defrosting starting action is met. The defrosting control method can more accurately and more timely judge whether an evaporator frosts or not and judge the frosting degree, so that the defrosting action is started accurately and timely, and normal and efficient operation of a heat pump system is ensured.

A vapor compression cooling system includes a centrifugal compressor(s) for compressing a primary fluid in a cycle including at least two compressions, and a control module for controlling the centrifugal compressor dependent upon at least a condition of a secondary fluid. The module controls a power of the centrifugal compressor by adjusting a speed of the motor driving the compressor and/or an opening of guide vanes associated with at least one impeller. The module may also control a pressure drop of a primary fluid moving through at least one expansion device. The at least two compressions may be made in parallel or in series. A related method includes compressing a primary fluid in a first and a second compression cycle and adjusting a parameter of the compressor dependent upon a calculated desired power of the compressor.

The invention provides a control method of an electromagnetic valve for air conditioner liquid injecting cooling. An air conditioner comprises a control unit and the electromagnetic valve used for controlling liquid refrigerants of a compressor of the air conditioner to be bypassed to the low-pressure side of the compressor. The control unit is used for controlling the electromagnetic valve to be opened and closed. The control unit controls the electromagnetic valve to be opened and closed according to the magnitude relation of the exhaust temperature T1 of the compressor and the exhaust temperature preset value and/or the magnitude relation of the exhaust superheat degree of the compressor of the control unit and the preset temperature value. The electromagnetic valve is controlled to be opened and closed by increasing the magnitude relation of the exhaust superheat degree and the preset temperature value. Thus, compressor oil has a good lubrication effect, the service life of the compressor is prolonged, and the reliability of the compressor is improved.

The invention relates to a distributed type energy system based on demand side energy supply and a control method. The problems that the demand side and the supply side are not matched, and the energyutilization rate at the energy supply valley is low exist in a distributed type energy system, and the overall system energy efficiency is influenced. The distributed type energy system comprises a demand side, prime mover equipment, waste heat refrigeration/heating equipment, waste heat power generation equipment, a smoke flow distributing device, a main control system, a smoke flow distributingcontrol line, a prime mover control line and an energy demand feedback line. The main control system is connected with the prime mover equipment. The prime mover equipment is connected with the smokeflow distributing device. The main control system is connected with the smoke flow distributing device. The smoke flow distributing device is connected with the waste heat refrigeration/heating equipment and the waste heat power generation equipment. The waste heat refrigeration/heating equipment and the waste heat power generation equipment are both connected with the energy demand side, and theenergy demand side is connected with the main control system. According to the distributed type energy system based on demand side energy supply and the control method, the energy supply quantity ismatched with the energy demand quantity, and the energy utilization rate is increased.

A system for automatically identifying goods to be transported within a container having an environmental control unit. The system includes a sensor for sensing a code previously assigned to the goods. A processor uses the sensed code to select values of control parameters previously associated with the goods. The selected values are used by the environmental control unit to control the environment within the container.

Provided is an indoor unit (1) of an air conditioning system. The indoor unit (1), by means of an indoor fan (6), blows out from an exhaust port (5) conditioned air obtained by heat-exchange from a heat exchanger (3) that uses a slightly combustible refrigerant or a combustible refrigerant having a specific gravity higher than that of air. The indoor unit (1) is provided with: a refrigerant sensor (8) that detects a leaking refrigerant; and an exhaust port opening/closing mechanism capable of closing a part of the exhaust port (5). When the refrigerant sensor (8) detects leakage of the refrigerant, the indoor fan (6) is driven in the state where the part of the exhaust port (5) is closed by the exhaust port opening/closing mechanism.

The invention discloses a cooling device which comprises a compressor, a condenser, a throttle device and an evaporator. An outlet of the compressor communicates with an inlet of the condenser. An outlet of the condenser communicates with an inlet of the throttle device. An outlet of the throttle device communicates with an inlet of the evaporator. An outlet of the evaporator communicates with an inlet of the compressor. The cooling device further comprises a liquid pipe and a liquid container. The liquid pipe is provided with a heat exchange segment fixed relative to the evaporator. A liquid outlet and a liquid inlet of the heat exchange segment communicate with the inner space of the liquid container, and therefore a liquid circulation flow path is formed, and the liquid container is further provided with a cold liquid outlet. The cooling device comprises a temperature detection device, and the temperature detection device can directly or indirectly detect the temperature parameter of liquid at the liquid container or the liquid pipe. According to the cooling device, by means of the arranged liquid container and liquid circulation flow path, the liquid container can store low-temperature liquid cooled by the evaporator, and the low-temperature liquid can be provided to be used in time when use requirements exist.

There is provided a method of reducing noise in a cryogenic cooling system associated with a mechanical refrigerator forming part of said cooling system. The method comprises: monitoring vibrations in the cooling system during operation of the mechanical refrigerator; and modulating an operating frequency of the mechanical refrigerator based on the monitored vibrations so as to reduce the amplitude of said vibrations. This allows noise within the cooling system to be reduced.

The invention provides a heat pump unit and a control method. The heat pump unit comprises a compressor, an outdoor heat exchanger, a four-way valve, a radiation heat exchange device, an indoor heat exchange device and a hot water device; the radiation heat exchange device is connected with the outdoor heat exchanger and the four-way valve; the indoor heat exchange device is connected with the outdoor heat exchanger and the four-way valve; and the hot water device is connected with the compressor and the four-way valve. The radiation heat exchange device is used for refrigerating or heating byrefrigerant circulation; the indoor heat exchange device is used for refrigerating or heating by refrigerant circulation; the hot water device is used for heating water through refrigerant circulation; and the radiation heat exchange device, the indoor heat exchange device and the hot water device can be operated and stopped selectively. One set of unit operation has realized refrigerating, heating and heating water, and different heat exchange devices all exchange heat through the refrigerant circulation, so that the efficiency is high, and the power consumption is little; and the radiationheat exchange device adopts the heat exchange mode of radiation, and comfort and commonality are high.

The invention relates to a composite barrel thermal switch which comprises an upper flange, a lower flange and a thermal switch barrel. The thermal switch barrel comprises an inner barrel, an outer barrel and a middle barrel, the inner barrel is connected with the upper flange, the outer barrel is connected with the lower flange, and the two ends of the middle barrel are connected with the inner barrel and the outer barrel correspondingly. Compared with the prior art, the thermal conduction length of the thermal switch barrel is more than three times that of a common barrel, so that the thermal conductivity is at most 1/3 of the original thermal conductivity, and thermal conduction in a thermal turn-on state is reduced.

The invention relates to the technical field of household appliances, in particular to a refrigerator and an auto-cascade refrigeration system thereof. The refrigerator comprises a cabinet body, a door body, the auto-cascade refrigeration system, a single-stage refrigeration system and a temperature control system; the cabinet body is sequentially provided with a cryogenic chamber and a freezing and refrigerating conversion chamber from top to bottom, wherein the cryogenic chamber and the freezing and refrigerating conversion chamber are both provided with openings; one side end of the door body is hinged to the cabinet body so as to movably cover the openings; the auto-cascade refrigeration system is used for cooling of the cryogenic chamber; the single-stage refrigeration system is usedfor cooling of the freezing and refrigerating conversion chamber, and the single-stage refrigeration system comprises a second compressor; the temperature control system is in electric control connection with the auto-cascade refrigeration system and the single-stage refrigeration system; and the cabinet body is provided with a first machine bin located below the freezing and refrigerating conversion chamber and a second machine bin located above the copious cooling chamber, a first compressor is arranged in the first machine bin, and the second compressor is arranged in the second machine bin. According to the refrigerator and the auto-cascade refrigeration system, the refrigerating effect of the refrigerator is improved, the structural design of the refrigerator is optimized, the space utilization of the refrigerator is improved, and the influence of noise on a user is reduced.