Class / Patent application number | Description | Number of patent applications / Date published |
062224000 | By condition at low side | 32 |
20100287964 | REFRIGERATING APPARATUS - In a heat-source unit ( | 11-18-2010 |
20160102897 | CONTROL DEVICE FOR REFRIGERATION AND CONDITIONING SYSTEMS - A control device for refrigeration and conditioning systems, comprising:
| 04-14-2016 |
062225000 | At or beyond evaporator outlet, i.e., superheat | 30 |
20080216500 | SYSTEM AND METHOD FOR CONTROLLING AN AIR CONDITIONER OR HEAT PUMP - A control procedure operates an expansion valve of an air conditioning system. The control procedure utilizes a first control procedure to bring a calculated superheat value within a range of a target superheat value, and a second control procedure to cause the calculated superheat value to match the target superheat value. Both the first and second control procedures preferably use Proportional, Integral, Derivative control algorithms. | 09-11-2008 |
20080229770 | Air conditioning system provided with an electronic expansion valve - The present invention relates to an air conditioning device, in particular for motor vehicle, including an air-conditioning circuit comprising a compressor ( | 09-25-2008 |
20080282717 | Expansion Valve and Refrigeration Device - An expansion valve includes a valve body | 11-20-2008 |
20090019872 | AIR CONDITIONING APPARATUS - An air conditioning apparatus includes a refrigerant circuit and an operation control section. The operation control section is capable of performing a refrigeration cycle for causing an outdoor heat exchanger to function as a refrigerant condenser and an indoor heat exchanger to function as a refrigerant evaporator, while performing superheat degree control for controlling the aperture of an indoor expansion valve so that the degree of superheat of the refrigerant at the outlet from the indoor heat exchanger is constant. The operation control section sets a lower aperture limit for the indoor expansion valve to perform the superheat degree control, and reduces the lower aperture limit when the refrigerant at the outlet from the indoor heat exchanger is detected to be wet. | 01-22-2009 |
20090031740 | Expansion valve control system and method for air conditioning apparatus - A vapor compression air conditioning system includes a motor operated expansion valve and control unit including sensors for determining the amount of superheat of the working fluid at or adjacent to the compressor inlet. Expansion valve position is adjusted to maintain a predetermined amount of superheat. The sensors may sense working fluid evaporator temperature and temperature downstream of the evaporator. Dual motor operated expansion valves may be disposed in the working fluid conduit between the heat exchangers in a reversible system. In operation, the expansion valve position may be set as a function of ambient temperature, a previous position, and predetermined superheat requirements to minimize liquid ingestion by the compressor. | 02-05-2009 |
20090151378 | Refrigeration System - If the degree of opening of an electronic expansion valve ( | 06-18-2009 |
20090158764 | Air conditioning system - An air conditioning system is able to decrease the amount of refrigerant between a first expansion device and an injection valve and thus adjust the pressure of an injected refrigerant by decreasing the opening degree of the first expansion device and maintaining the opening degree of a second expansion device upon opening of the injection valve, thereby making the system stable upon opening of the injection valve. Furthermore, upon starting up a compressor, the opening degrees of the first and second expansion devices are partly decreased based on the start-up of the compressor and then gradually opened again, and upon completion of the start-up of the compressor, the opening amounts of the first and second expansion devices and the injection valve are controlled, thereby making the cycle more stable. | 06-25-2009 |
20090241570 | Refrigerant cycle system - In a refrigerant cycle system, a compression mechanism of an electric compressor sucks and compresses refrigerant, and an electric motor that drives the compression mechanism is cooled by the refrigerant. A variable throttle mechanism decompresses the refrigerant discharged from the electric compressor. A motor temperature detector detects a temperature of the electric motor. A motor protection determiner determines whether the temperature of the electric motor detected by the motor temperature detector is equal to or higher than a criterion value. A motor protection controller controls the variable throttle mechanism so that an opening degree of the variable throttle mechanism does not decrease when the motor protection determiner determines that the temperature of the electric motor is equal to or higher than the criterion value. | 10-01-2009 |
20090241571 | Temperature sensing tube for expansion valve - To provide a temperature sensing tube for an expansion valve in which a hunting can be prevented by slowing of a temperature reaction rate of an expansion valve, a ceramic sintered member serving as a heat transfer delay member ( | 10-01-2009 |
20100005819 | REFRIGERATION APPARATUS - A refrigeration apparatus ( | 01-14-2010 |
20100011793 | REFRIGERATION CONTROL SYSTEM - A control apparatus and associated method for a refrigeration system are provided. The control apparatus includes sensors capable of detecting controlled refrigerator zone temperatures and superheat levels of refrigerant vapour exiting an evaporator. The control module receives input from the sensors, compares the input to a determined controlled refrigerator zone set point and a learned superheat level, and generates an output with respect thereto. In particular the output modulates an electronic evaporator pressure regulating (EEPR) valve between an open and a closed position in response to detecting abnormal operation of the thermostatic expansion valve or electronic expansion valve. | 01-21-2010 |
20100024455 | DYNAMIC SUPERHEAT CONTROL FOR HIGH EFFICIENCY REFRIGERATION SYSTEM - A vapor compression refrigeration system including components capable of determining the superheat at a compressor inlet is provided. The vapor compression refrigeration system may include sensors capable of making measurements from which the superheat at the compressor inlet may be determined. The vapor compression refrigeration system may be operable to compare the determined superheat level at the inlet to the compressor to a desired superheat level and generate a new evaporator discharge superheat level target for one or more evaporators operatively interconnected to the compressor to affect the superheat at the compressor inlet. The vapor compression refrigeration system may be operable to broadcast the new evaporator discharge superheat level target to the one or more evaporators over a communications bus. The vapor compression refrigeration system may update and broadcast the evaporator discharge superheat level target at programmed intervals. | 02-04-2010 |
20100031681 | ELECTRONIC BLOCK VALVE - An electrically controlled expansion valve package ( | 02-11-2010 |
20100089084 | HEAT SOURCE APPARATUS AND METHOD OF STARTING THE APPARATUS - After a chiller unit is started, an opening command of 10 pulses is output to an electronic expansion valve, and after a predetermined period of time (at the time of starting with unload) elapses, an opening command of 100 to 150 pulses is output to open the electronic expansion valve up to a predetermined opening degree. Thereafter, a discharge side refrigerant super-heat TdSH is monitored and a closing command of 1 pulse/sec is output to the electronic expansion valve to drive the same in a closing direction in a short time until TdSH becomes 20 K. After TdSH has reached 20 K, a closing command of 1 pulse/3 sec is output to the electronic expansion valve, until TdSH becomes 25 K, to drive the electronic expansion valve 3 at a smaller speed in the closing direction than that speed in the closing direction until TdSH becomes 20 K. After TdSH reaches 25 K, it is judged that an operation has shifted to a stable operation, and the opening degree of the electronic expansion valve is controlled while a suction side refrigerant super-heat TsSH is monitored. | 04-15-2010 |
20100175400 | REFRIGERATION APPARATUS - The present disclosure allows for easy settling of control of capability of an refrigeration apparatus for performing a supercritical refrigeration cycle. | 07-15-2010 |
20100180612 | REFRIGERATION DEVICE - A refrigeration device includes a compression mechanism, a radiator, a first expansion mechanism, a second expansion mechanism, an evaporator, a first internal heat exchanger, a branch pipe, a third expansion mechanism, and a second internal heat exchanger. The first internal heat exchanger causes heat to be exchanged between refrigerant that flows from the radiator to the inflow side of the first expansion mechanism, and refrigerant that flows from the evaporator to the compression mechanism. The branch pipe branches from a third refrigerant pipe for connecting the radiator and the second expansion mechanism, and merges with the second refrigerant pipe. A third expansion mechanism is provided to the branch pipe. The second internal heat exchanger causes heat to be exchanged between refrigerant that flows out from the first expansion mechanism, and refrigerant that flows out from the third expansion mechanism. | 07-22-2010 |
20100180613 | EXPANSION VALVE - An expansion valve having a tubular member ( | 07-22-2010 |
20100205988 | Condensing Unit Having Fluid Injection - A climate control system is provided and may include a compressor, a first heat exchanger in fluid communication with the compressor, a second heat exchanger in fluid communication with the compressor and the first heat exchanger, and a third heat exchanger disposed between the first heat exchanger and the second heat exchanger. A conduit may be fluidly coupled to the third heat exchanger and the compressor and may selectively supply fluid to the compressor. A valve may control a volume of fluid supplied to the compressor via the conduit and a controller may control the valve based on a discharge temperature of the compressor and a super heat temperature of the third heat exchanger. | 08-19-2010 |
20110162400 | Modular Evaporator and Thermal Energy Storage System for Chillers - A modular evaporator which can be assembled from a number of standard modules is provided. Depending on the requirements, the modular evaporator can be assembled to meet a wide range of design cooling loads. Additionally, the modular evaporator is capable of generating and holding ice for thermal storage purposes, eliminating the need for external ice storage tanks. Furthermore, the heat transfer and thermal storage fluid for the evaporator can simply be water which considerably simplifies the system, lowers the cost, and increases the efficiency of the heat transfer loop. | 07-07-2011 |
20120266623 | CONTROL ALGORITHM FOR ELECTRONIC EXPANSION VALVE MODULATION - An electronic expansion valve (EEV) is employed in refrigeration systems to regulate the flow of refrigerant through an evaporator. The position of the EEV is controlled through a first control loop that generates a first position signal based on superheat feedback associated with the refrigeration system, and a second control loop that generates a second position signal based on pressure feedback associated with the refrigeration system. The larger of the first position signal and the second position signal is selected to control the position of the EEV value, and the selected position signal is provided in feedback to both the first control loop and the second control loop. | 10-25-2012 |
20130074536 | Thermostatic Expansion Device And Air Conditioning Loop Comprising Such A Thermostatic Expansion Device - The subject of the invention is a device ( | 03-28-2013 |
20130283836 | EXPANSION VALVE AND VIBRATION-PROOF SPRING - An expansion valve includes a shaft for transmitting the drive force to a valve element and a vibration-proof spring, set between the body and the shaft, which generates the sliding friction by biasing the shaft. The vibration-proof spring includes a spring body of a hollow tube shape, a spring part, which is integrally formed with a side wall of the spring body, and a bulging portion formed on the spring part in a protruding manner such that the tip of the bulging portion is placed opposite to a part of the shaft. When the bulging portion abuts against the shaft inserted to the vibration-proof spring, the spring part is placed in a position along the spring body or is warped outwardly from the spring body, so that the elastically reactive force resulting from the warped spring part allows the shaft to slide in a stabilized manner. | 10-31-2013 |
20140041405 | THERMAL EXPANSION VALVE - A thermal expansion valve comprises a valve body and a valve core member. The valve body is provided with a first connecting chamber, a lower cavity with a transmission member built in, and a first sealing member for separating the first connecting chamber and the lower cavity. A fifth pressure-bearing surface and a sixth pressure-bearing surface, pressed by a cold medium in the first connecting chamber in opposite directions, are disposed on a side wall of the valve core member. The first sealing member comprises a first flexible sealing element, disposed between the transmission member and an upper end portion of the valve core member and having a first edge portion connected to the valve body in a sealing manner. A sum of an effective stress area of a first pressure-bearing surface of the first flexible sealing element and a stress area of the fifth pressure-bearing surface is substantially equal to a sum of an effective stress area of a third pressure-bearing surface of the upper end portion of the valve core member and a stress area of the sixth pressure-bearing surface. Through the design of the structure of the thermal expansion valve, in an aspect, reliability of sealing between the valve body and the upper end portion of the valve core member can be ensured, sensitivity of the valve is improved, and difficulty of manufacturing the valve body and the valve core member can be reduced; and in another aspect, pressure influence caused by the cold medium in the first connecting chamber on the movement of the valve core member can be eliminated. | 02-13-2014 |
20150013368 | EXPANSION VALVE - A temperature sensitive rod is communicated with a diaphragm that is displaceable in response to a pressure difference between an internal pressure of a sealed space, in which a temperature sensitive medium is sealed, and a pressure of a low pressure refrigerant outputted from an evaporator. A blind hole, which opens to the sealed space, is formed in an inside of the temperature sensitive rod. The temperature sensitive medium is a mixture gas of the refrigerant and an inert gas. A mixing ratio of the inert gas in the temperature sensitive medium corresponds to a ratio of an equivalent diameter of the blind hole relative to a depth of the blind hole in such a manner that a time constant of heat conduction from the temperature sensitive rod to the temperature sensitive medium is kept within a desired time constant range. | 01-15-2015 |
20150052924 | Thermal Expansion Valve with Power Element - An improved power element for use with a thermal expansion valve. The power element contains a filter positioned at an open end of the power element to prevent debris from entering the body of the thermal expansion valve. | 02-26-2015 |
20150300714 | AIR-CONDITIONING APPARATUS - A controller, at least during the heating operation, controls the opening degree of a second expansion device and/or a third expansion device based on a discharge refrigerant temperature detected by a discharge refrigerant temperature detector, or a value computed using the discharge refrigerant temperature, and causes refrigerant having a quality equal to or greater than 0.9 and less than or equal to 0.99 to be suctioned into a compressor. | 10-22-2015 |
20150323234 | A CONTROL ARRANGEMENT FOR CONTROLLING SUPERHEAT - A control arrangement ( | 11-12-2015 |
20160023538 | AIR CONDITIONING SYSTEM FOR MOTOR-VEHICLES - An air conditioning system for motor-vehicles includes a thermally controlled expansion valve unit for regulating the expansion of the fluid upstream of the evaporator, depending upon the temperature downstream of the evaporator. An intermediate heat exchanger provides a heat exchange between the conduit upstream of the evaporator and the conduit downstream of the evaporator. The expansion valve unit is arranged in such a way that its temperature sensor detects a temperature of the fluid along the conduit downstream of the evaporator at a portion of this conduit which is located downstream also with respect to the intermediate heat exchanger. A connecting flange is interposed between the evaporator and the thermally controlled expansion valve unit. | 01-28-2016 |
20160097574 | CONTROL VALVE - An expansion valve includes a shaft one end side of which connects to a power element and the other end side of which connects to a valve element, the shaft transmitting the drive force, generated by the power element in a direction of axis line, to the valve element, and a sliding mechanism that applies a sliding resistance to the actuation of the valve element. The sliding mechanism is configured such that the magnitude of the sliding resistance affected to the valve element is varied by the position of the valve element in the direction of axis line in the body. | 04-07-2016 |
20190145679 | APPARATUS FOR CALIBRATING AND TESTING MULTIPLE SUPERHEAT CONTROLLERS | 05-16-2019 |