Cooling unit with electric drive ac
(57) Abstract:Usage: in the field of refrigeration, particularly in refrigeration systems with three-phase asynchronous electric motor of the compressor. Usage: refrigeration system includes a switching-on unit connected to the first control inputs of the first and second switching blocks, switching the inputs of which are connected to three-phase AC power, and outputs connected to the motor. There is also a third and fourth switching units, the unit determining the phase sequence and the block definition phase. The first and second switching inputs of the third switching unit is connected with the second control inputs of the first and second switching blocks. The outputs of the block definition phase rotation unit definition phase is connected to the control inputs respectively of the third and fourth switching blocks. 5 Il. The invention relates to refrigeration, and more particularly to refrigeration systems with three-phase asynchronous electric drive compressors, and can be used in refrigerated trucks, marine refrigeration, refrigerators, compressors, which allow rotation that is Torah [1, 2] contains the starting motor, means of temperature control, and in necessary cases  also funds emergency stop circuit of the motor. Such known solutions provide better temperature and saving energy costs. However, they are relatively complex and do not provide efficient operation of the compressor motor of the above type by washing it from the AC three-phase voltage.Also known refrigerating unit closest to the invention to the technical nature of containing block inclusion, switching unit, three-phase motor and the compressor; switching the inputs of the switching unit is connected to a source of three phase voltage, the outputs of the switching unit is connected to the phase input of the motor, the shaft of which is mechanically connected with the shaft of the compressor, the output of block inclusion connected with the control input of the switching unit  When applying the control signal with the unit turned on at the control input of the switching unit last works and connects the power circuit of the motor to a three-phase network. The motor starts to rotate, causing the rotation of the shaft compr is about, it requires strict adherence to the alternation of phases of three-phase voltage, because the compressors of refrigeration systems because of its design features allow rotation only in a certain direction. Therefore, before enabling you to check the phase sequence. If it is desired to provide the desired direction of rotation of the motor and the compressor shaft, the connection can be performed. Otherwise, you must first install the desired phase sequence. In addition, when the breakage of any of the phases of three-phase asynchronous motor stops rotating, and the currents in the two remaining phases are sharply increased, reaching values of short circuit currents that may cause failure of the motor and circuits.The objective of the invention is to provide a refrigeration unit driven by AC motor, free from the above disadvantages. Provide technical result is improved performance and increased reliability of the refrigeration unit of the above type.This technical result is achieved in that the cooling unit Crawley an input connected to the output unit activation and switching inputs connected to three-phase AC, three-phase motor, phase inputs of which are connected to the outputs of the first switching unit and the compressor, the shaft of which is connected with the shaft three-phase motor, in accordance with the invention contains the second, third and fourth switching units, the unit determining the phase sequence and the block definition phase, the first control input of the second switching unit is connected to the output of the block activation signal inputs of the first switching unit is connected with the same switching inputs of the second switching unit, respectively in pairs, one of the outputs of the first switching unit is connected to the same output of the second switching unit, and the other two outputs of the first switching unit is connected with the other two outputs of the second switching unit pairwise cross-phase unit determining the phase rotation unit definition phase is connected to three-phase AC power, the output unit determining the phase rotation is connected with the control input of the third switching unit, the first and second switching inputs which are connected respectively with the second control inputs pervogodok switching a control input connected to the output of the block definition phase.The achievement of the technical result is the whole set of essential features. The features that distinguish the invention from the prototype include the introduction of a second, third, and fourth blocks of the switching unit determination of phase sequence and block definition phase, as well as their connections with each other and with other elements of the installation. This helps to ensure the normal operation of the refrigeration unit at arbitrary phase sequence, without requiring pre-operations checks, control and switching phases, and allows you to eliminate the failure or malfunction of the installation in case of phase failure due to timely automatic shutdown of the installation. All of the above provides improved performance, efficiency and reliability of the installation as a whole.The invention is illustrated by embodiments thereof illustrated by the drawings which show the following: Fig.1 functional diagram of the refrigeration unit made according to the invention; Fig.2, 3 examples of execution of a block definition phase rotation; Fig.4, 5 examples vypolneniyasvoey to the first control inputs of the first 2 and second 3 blocks switching. First, second and third switching inputs of the first switching unit 2 are connected in pairs respectively with first, second and third switching inputs of the second switching unit 3 and connected to the phases AC 380V, 50 Hz. First, second and third outputs of the first switching unit 2 are connected respectively to the first, second and third power input of the electric motor 4. First, second and third outputs of the second switching unit 3 are connected respectively with the first, third and second power input of the electric motor 4, which shaft is connected with the shaft of the compressor 5.It should be noted that the connection of the outputs of the first 2 and second 3 block switching is not only possible, but is given only as an example. The General rule of their connection, according to the invention, is that one of the outputs of the first switching unit 2 must be connected to the same name with him the second output of the switching unit (as in this case: the first output unit 2 to the first output unit 3), and the other two outputs from each of blocks 2, 3 must be interconnected in pairs cross (for example, the second output unit 2 with the third output unit 3, the third output unit 2 to the second output unit 3).
switching 6. The second control input of the second switching unit 3 is connected with the second switching input of the third switching unit 6, the output of which is connected to the switching input of the fourth switching unit 7.Phase AC network connected to the first, second and third phase inputs of the block definition phase rotation 8, the output of which is connected with the control input of the third switching unit 6. In addition, the phase of the AC network connected to the first, second and third phase inputs of the block definition phase 9, the output of which is connected to the control input of the fourth switching unit 7, the output of which is grounded.Refrigerating unit operates as follows.When signal block enable 1 activates the first control inputs of the first 2 and second 3 blocks switching. Power voltage 380 V, 50 Hz one (a), second () and third (C) phases in random order arrives at the switching inputs of the first 2 and second 3 units switching, as well as on the first, second and third inputs, respectively, of the block definition phase rotation 8 and the block definition phase 9. Unit definition phase rotation 8 determines the sequence of phases silo shall determine the phase rotation 8 may be performed in various ways, for example, as shown in Fig.2, 3. The principle of operation of the unit determine the phase rotation performed according to Fig.2, based on the formation of different phase voltage at the capacitive load (C1) in one phase (a) and resistive load (R1, R2, and R3) in the other two phases (b, C). When the correct sequence of phases there is a definite correlation between the stresses in the individual phases, which is signaled by the illumination of the neon bulbs L. Feeding this voltage threshold element (not shown), it is possible to generate the signal used to control the power switches of the phase voltages.The principle of the block definition phase rotation according to the second variant (Fig.3) based on the control pulses of the reference voltage generated from one of the phase voltage using the comparator 10 and shaper of the reference voltage 11, the key block circuit diagram of the sample and hold 12. On the signal input unit 12 from the output of the comparator 13 receives the signal generated from the voltage of the other phase, and the output is formed by a logical signal of one of two levels, each of which corresponds to the set ("correct") and other than him ("wrong") turn eti switching unit 6 connects the second control input of the first switching unit 2, providing the connection of the electric motor 4 to the network directly. If the phase sequence in the network does not match the phase sequence for the engine 4, the third switching unit 6 connects the second control input of the second switching unit 3, while the connection of the electric motor switch two of the three phases "criss-cross" (i.e. swapping phase in the corresponding pair of phases), resulting again ensures compliance with phase sequence in the motor 4 of the "correct" phase sequence network.Thus, in both cases, when determining how "right" and "wrong" phase rotation unit 8, the rotation of the motor 4 is always in the same direction.Simultaneously, the block definition phase 9 determines whether each of the three phases, and generates the control signal in the form of a high or low logic level, for example "1", in the absence of the cliff and "0" at the precipice. This can be ensured when the execution of the block definition phase 9 on the logic chip, as shown in Fig.4. Here, the diodes D1 D3 - rectifiers, capacitors C2, C4 filters. The operation of such a device is completely determined by the matrix status is th logic level "1" when the integrity of all phases And, B, C, and a low logic level "0" at the precipice of any phase a, b or C.Work unit definition phase, performed according to the second variant (Fig.5) of the operational amplifier or comparator 14, based on the addition of rectified and filtered values of the signals (in the rectifier diodes D5 d and filters capacitors C5 C7, and resistors R4, R6), is proportional to the phase voltages, and comparing the sum with a threshold Ucm. According to the results of comparison are formed above the gate signal is high or low.In the absence of breakage of the phase control signal from block 9 is supplied to the control input of the fourth switching unit 7, the switching circuit causes the switching output of the third switching unit 6, thus providing a common circuit operation of the first 2 and second 3 blocks switching.Thus, in the absence of phase power voltage depending on the rotation of its phases is triggered or the first switching unit 2 or the second switching unit 3, providing a phase rotation corresponding to the desired direction of rotation of the motor 4, the rotating shaft of the compressor 5 in the desired direction.Thus, the execution of the refrigeration installation according to the invention ensures its reliable operation, improved performance due to the automatic determination of the integrity of the phases of the power supply voltage and timely disconnection of the electric motor during the registration phase. In addition, due to the automatic determination of the phase rotation using the added switching means provides rotation of the motor in the desired one and the same direction, regardless of actually having a place phase sequence. 1, the Refrigerating unit driven by an AC motor containing unit turn on, the first switching unit, a first control input connected to the output unit enabling and switching inputs connected to three-phase AC, three-phase motor, phase inputs of which are connected to the outputs of the first switching unit and the compressor, the shaft of which is connected with the shaft three-phase elektroduhovaya phases and the block definition phase, the first control input of the second switching unit is connected to the output of the block activation signal inputs of the first switching unit is connected with the same switching inputs of the second switching unit, respectively in pairs, one of the outputs of the first switching unit is connected to the same output of the second switching unit, and the other two outputs of the first switching unit is connected with the other two outputs of the second switching unit pairwise cross-phase unit determining the phase rotation unit definition phase is connected to three-phase AC power, the output unit determining the phase rotation is connected with the control input of the third switching unit, the first and second switching inputs which are connected respectively with the second control inputs of the first and second switching blocks, and the output of the third switching unit is connected to the switching input of the fourth switching unit, a control input connected to the output of the block definition phase.
FIELD: cooling engineering.
SUBSTANCE: device comprises two temperature gauges, unit for comparing temperatures, unit for generating alarm signal on wet stroke, converters for converting signals from temperature gauges into the alternating signals, frequency synchronizer, amplifier, and protecting relay. The first temperature gauge is set in the line for supplying coolant to the object to be cooled. The second temperature gauge is set at the inlet of the line for withdrawing the vapors of coolant from the object to be cooled to the bridge of switching of the compressors. The converters are synchronized in frequency. The unit for comparing temperatures is made of a transformer with magnetization and two primary windings which are connected in series with the signal converters. The secondary winding is connected with the input of the amplifier whose output is provided with the protecting relay.
EFFECT: enhanced reliability.
FIELD: mechanical engineering, particularly devices to prevent wet vapor ingress in cylinders of compressors used in gas-processing plants for pressure increase in natural gas pipelines.
SUBSTANCE: device comprises horizontal sucking pipe and emergency shutdown sensor. Low-frequency ultrasound generator is arranged inside horizontal sucking pipe. Ultra-violet radiation sensor is installed in lower part of horizontal sucking pipe and is spaced 0.1-1 m from low-frequency ultrasound generator.
EFFECT: increased operational reliability.
FIELD: conditioning system, particularly ones adapted for vehicle conditioning and provided with centrifugal compressors.
SUBSTANCE: cooling plant comprises closed loop with sealed centrifugal pump with built-in electric motor, as well as condenser with axial fan, thermostatic expansion valve and evaporator. Thermal phial of thermostatic expansion valve is installed at evaporator outlet. Bypass line with throttle is connected in parallel to thermostatic expansion valve. Object to be conditioned is communicated to evaporator through air loop provided with centrifugal fan. Throttle has locking valve and bellows-type pneumatic drive having control cavity communicated with thermal phial of thermostatic expansion valve.
EFFECT: simplified structure and increased operational reliability.
FIELD: refrigerating engineering.
SUBSTANCE: refrigerating plant comprises vessels and metallic pads that underlie the vessels and are connected to the pipeline through branch pipes. The pipeline is mounted with an inclination and is connected with the pressure-tight tank for collecting spilled ammonia. The tank is connected with the atmosphere through the pipeline and stop valve and is provided with air separator for removing air from its steam zone, branch pipes, and pipeline.
EFFECT: enhanced efficiency.
3 cl, 1 dwg
FIELD: lighting; heating.
SUBSTANCE: invention proposes a method for controlling operation of a refrigerator compressor whereby thawing is effected when the temperature inside the refrigerator reaches a predetermined thawing temperature. Refrigerating capacity of the compressor mounted inside the refrigerator is changed depending on the temperature inside the refrigerator by regulating the direction of rotation of the compressor. The refrigerating capacity of the compressor is increased by rotating the compressor in one direction and is decreased by rotating the compressor in another direction, this second direction being reverse to the first one. Prior to thawing the compressor is repeatedly rotated in the second direction and stopped until the predetermined thawing temperature is achieved inside the refrigerator. After thawing the compressor is rotated in the first direction until the predetermined temperature is achieved and in order to maintain this predetermined temperature the compressor is periodically stopped or rotated in the second direction. A device for controlling operation of a refrigerator compressor includes a microcomputer, a working frequency converter, a rotation signal generating unit and a unit for measuring temperature inside the refrigerator. The working range of the temperature measuring unit is predetermined depending on the compressor rotation direction.
EFFECT: reduced power consumption by a refrigerator; increased capacity and precise temperature control of the refrigerator.
FIELD: air conditioning.
SUBSTANCE: invention pertains to the technology of air conditioning. The air conditioner has a heat source device and a terminal device, joined by connection pipes for a coolant, in which there is exact determination of whether the contour of the coolant has the required amount of coolant or not. The conditioner can work, when switched in any of the normal working modes, in which the heat source device, consisting of a compressor and a lateral heat exchanger of the heat source device, is joined to terminal devices, consisting of lateral expansion valves and terminal lateral heat exchangers, using connection pipes. Each device is controlled depending on the work load of the terminal devices, or the working mode is determined by the quantity of the coolant, in which the terminal devices carry out cooling operations, and the running power of the compressor is regulated such that, the pressure during evaporation of terminal lateral heat exchangers is constant with control of lateral expansion valves such that, the degree of super heating on outlets openings of terminal lateral heat exchangers have a positive value.
EFFECT: accurate determination of whether the coolant contour has the required amount of coolant in a monofunctional conditioner.
12 cl, 10 dwg
SUBSTANCE: invention is referred to electric engineering and may be used for cooling devices. Cooling device freezes products without additional inducer due to compressor motor operation in cooling cycle at alternating speed rates from power supply voltage.
EFFECT: improvement of productivity by freezing.
4 cl, 7 dwg
SUBSTANCE: invention relates to cooling compartments, refrigerators with proper cooling compartments and methods of control. Super-cooling device contains storage compartments and super-cooling compartments. Storage compartments are supplied with cooled air from cooled air supply unit. Super-cooling compartment is inside storage compartment. Air-cooled super-cooling compartment cools down products. It consists of container and cover. Container forms free space for product storage. Cover is used for opening and closing container outlet. There are holes in cover for cooling air supply to and from super-cooling compartment. There is also a screen in cover to open and close holes. In addition, super-cooling plant contains temperature sensor inside super-cooling compartment and control unit.
EFFECT: development of refrigerator and control method, which may keep drinking compartment temperature at optimal levels and produce super-cooled drink in fast manner.
26 cl, 11 dwg
SUBSTANCE: present invention pertains to a cooling device. The cooling device has cooling circuit (9) comprising: i) compressor (2), executing the cooling cycle; ii) evaporator (3), absorbing heat energy of the medium being cooled; iii) condenser (4), transmitting heat energy to an external medium; iv) capillary pipe (5), allowing for expansion of the cooling agent coming out of condenser (4), and carrying the cooling agent to evaporator (3); v) valve (6) with electromagnetic control, controlling flow of the cooling agent and located between condenser (4) and capillary pipe (5); vi) bypass line (7), leveling pressure in the sucking and blowing parts of the compressor (2). The cooling circuit (9) also has: i) valve (16) electromagnetically controlled, which prevent reverse flow to evaporator (3) when compressor (2) is not working and which is in the sucking part of the compressor (2); ii) control mechanism (8), which delays opening of electromagnetically controlled valve (16) by a period, which runs from starting the compressor (2) until a limit value of torque is attained.
EFFECT: prevention of migration of cooling agent when the compressor is not working and easier start up of the compressor.
3 cl, 3 dwg
SUBSTANCE: method for operation of heat pump may be used in refrigerating equipment and in heat pump sets for heat and cold supply to consumer. Mentioned technical problems are solved by method of heat pump operation, which includes serially realised processes of working medium compression and expansion with its transition from compression chamber to expansion chamber and back with heat removal after compression process and heat supply after expansion process, at that compliance of pressure value in the end of expansion process to pressure value in the beginning of compression process is maintained by means of additional working medium supply to expansion chamber, in which expansion process is realised in at least two expansion chambers, and supply of additional working medium in expansion chambers is realised by means of its transfer directly from one expansion chamber to the other.
EFFECT: increased efficiency parametres of heat pump.
FIELD: refrigeration equipment.
SUBSTANCE: refrigerating system comprises removable network panel installed on outer surface of refrigerator and TV module or TV antenna unit adapted to receive TV signal and transmit thereof to network panel in wireless manner. This avoids the need to connect the refrigerator with TV antenna output by wires. TV module or TV antenna unit is connected to TV receiver or to TV antenna output to receive TV signal and to transmit the signal to network panel adapted to receive and display the TV signal.
EFFECT: elimination of wire connection between refrigerator and TV antenna output and, as a result, possibility to install the refrigerator in any location, increased convenience of TV watching with the use of the refrigerator.
17 cl, 5 dwg
FIELD: refrigeration equipment, particularly provided with arrangements or mounting of control or safety devices.
SUBSTANCE: refrigerator comprising at least one cooling chamber defined by housing and door thereof. Temperature inside the cooling chamber varies within a certain range in dependence of location and time. The cooling chamber comprises a number of areas in which above local range of temperature fluctuations in dependence of location and time is less than common range of temperature fluctuations of cooling chamber as a whole. Display, which indicates representative data concerning above temperature fluctuations in at least one cooling chamber area is also provided.
EFFECT: possibility to store different food products in above cooling chamber in optimal storage conditions.
17 cl, 8 dwg
SUBSTANCE: method comprises cooling blood in the course of donation with forced circulation of air in the working chamber of the first thermostat and setting the container in the second chamber of the second thermostat after donation, where the containers filled with blood together with the containers filled with the same amount of donor's blood imitator are allowed to stand at a temperature close to that of the normal body temperature. The device comprises first thermostat whose first working chamber receives cooling member, fan, and first temperature gauge, first control unit with two commutating contacts, and first temperature controller. The second thermostat has the second working chamber that receives the second heater, second temperature gauge, second control unit, and second temperature controller.
EFFECT: enhanced cooling rate.
5 cl, 7 dwg
FIELD: cooling and refrigerating engineering.
SUBSTANCE: proposed cooling or freezing apparatus contains several zones 10,11 for cooling, freezing and/or conditioning, and interactive indicator 1. Information from cooling, freezing and/or conditioning zones is put out on indicator. Set includes also input device 5-7 by means of which user can put in data. Indicator 1 is made for putting out messages generated on base of data introduced by user. Indicator 1 is made for graphical representation of zones of cooling, freezing and/or conditioning and recommended zones can be shown or graphically separated. Invention makes it possible to put out graphic data on interactive display and provide advices and recommendations concerning storing of products in corresponding zone.
EFFECT: convenience in handling of cooling or freezing apparatus.
FIELD: refrigeration equipment, particularly fridges and doors thereof.
SUBSTANCE: fridge comprises body door and body adapted to connect fridge door. The door comprises outer wall and inner wall connected with each other along longitudinal and transversal edges. Display member is mounted on upper front body edge. Transversal edge has inspection window extending through the full door depth in which the display member may be seen when door is closed.
EFFECT: increased door dimensions along with possibility to see control members connected to front body side when door is installed in closed position.
11 cl, 9 dwg
FIELD: refrigeration equipment.
SUBSTANCE: refrigerator comprises heat-insulation body defining inner space and provided with heating device for inner space heating. Body encloses inner container and heat-insulation layer surrounding the container. Inner container has orifice. Heating device is installed on support to provide access to the device from inner space and at least partly closes orifice.
EFFECT: prevention of heating device failure and increased heating device repairability.
13 cl, 7 dwg
FIELD: refrigeration equipment.
SUBSTANCE: refrigerator comprises switch with contactless control and case enclosing the switch. The case has fastening means for removable case retention inside orifice. Plug connectors to bring the switch into circuit are provided on one case side. Refrigerator wall has plug socket with mating members to receive plug connectors of the switch. Switch is carried by plate provided with plug connectors formed on one plate end. The switch is of magnetically operated sealed type, namely reed switch.
EFFECT: decreased moisture sensitivity, possibility of sensor installation on refrigerator body and replacement.
12 cl, 7 dwg
FIELD: heating, refrigerating equipment.
SUBSTANCE: invention refers to refrigerating equipment. The refrigerating device with a super cooling function contains a chamber for storage of drinks, a refrigerating unit for cooling the storage chamber and a control unit. The refrigerating unit includes such components as a compressor, a circulating fan and a heat exchanger. The control unit is required for confirmation of the type of a drink, for assessment of the optimal temperature of super cooling and for control over the refrigerating unit in such a way that an optimal super cooling temperature would be maintained in the chamber. The method of control is also applied for the refrigerating device with super cooling function.
EFFECT: creation of a refrigerating device with a function of regulated super cooling.
21 cl, 8 dwg
FIELD: refrigerating engineering.
SUBSTANCE: refrigerator which has a drink overcooling function contents section for drink overcooling and storing which has variety of shelves certain types of drinks and connected by means of guide channel with ventilator for cooling air circulation; input unit, intended for choosing drink solidification level and outfitted by activate button button of solidification level choosing; control unit for regulation drink overcooling degree based on choose solidification level, which is connected with input unit; temperature sensor connected to control unit for definition of temperature in overcooling section; evaporator intended for cooling of overcooling section which is mounted on back wall of overcooling section; driving device connected to evaporator and control unit.
EFFECT: invention allows to regulate drink overcooling degree for supplying of selective regulation of solidification level.
18 cl, 8 dwg
FIELD: refrigeration engineering.
SUBSTANCE: invention proposes a refrigerator with a casing housing a cold room and a carcass built in the casing and incorporating the refrigerator cold-productivity control circuitry, the control being effected in response to the temperature change signal. The refrigerator comprises also one control element to set up a setting and/or the refrigerator working parameter indication element, and, at least one light to illuminate cold room, the carcass seat is arranged in the casing top cover.
EFFECT: simpler connection of control circuitry with the refrigerator various working assemblies.
12 cl, 6 dwg