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 [2] 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 [3] 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.

 

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