Defrost, in particular, freezer

 

The invention relates to automation and can be used for periodic inclusions of Executive automation devices AC, in particular for systems of defrosting the freezer. The technical result is to reduce energy consumption, improve the operational characteristics of the freezer, in particular increasing its efficiency and service life. The technical result is achieved by the fact that the defrost contains the power supply, timer, heater, sensor, defrost termination, compressor, three-prong electromagnetic relay, the movable contact of which is connected to the second pole of the power source. The total output of the time counter connected to the first fixed contact of the three electromagnetic relays and through the compressor is connected to the first pole of the power source. Defrost is further provided with a pulse generator with selectable frequency and trigger setting input connected to the output of the time counter. The trigger output is connected to the control winding of the three electromagnetic relays and control input pulse generator with switchable frequency synchronization input of which the connection to the connection point between the sensor end of the defrost and heater, the other output of which is connected with the second fixed contact of the three-prong electromagnetic relay, and the second output of the sensor defrost termination connected to the first pole of the power source. With a total output of the time counter are connected to a common output trigger and the total output of the pulse generator with selectable frequency, the output of which is connected to the counting input of the time counter. 1 Il.

The invention relates to the field of automation and can be used for occasional inclusions of Executive automation devices AC, in particular, for systems defrosting of the freezer.

Known defrost (see electric diagram of the freezer STINOL - 106 "Manual". Freezers "STINOL", 1996, page 29) that contains a timer and relay. As the time counter uses synchronous motor with step-down gear, which is mechanically connected to the switching relay contacts.

The disadvantage of the described device is the mechanical elements having low reliability.

Known defrost freezer NO FROST (ESU 468333.001, appr. 20.11.98, JSC "Egorshinskiy radio plant") that contains the power supply, the meter shall ewetel, the compressor and the sensor defrost termination, the total output of the time counter connected to the first fixed contact of the three-prong relay and through the sensor defrost termination connected to the first pole of the power source, and the output of the time counter is connected to the first output winding of the three-prong relay, the counting input of the counter time through the heater is connected to the second stationary contact of the relay and through the compressor connected to the first pole of the power source.

A disadvantage of the known device is the low reliability because of possible malfunction due to a short interruption and voltage. High power consumption is due to the constant flow of electric current through a three-prong relay.

The closest analogue to the proposed device is defrost (see RF patent 2167463, MPK7 N 01 N 43/10, N 05 1/02, op. 20.05.2001 g) containing a power source, a timer, heater, sensor, defrost termination, compressor, three-prong relay, the movable contact of which is connected to the pole of the power source, the total output of the time counter connected to the first fixed contact of the three-prong relay and through the compressor is connected with the other pole of the power source.

Weeks supply network occurs at fixed intervals of time, regardless of the size of the snow "fur" on the evaporator of the freezer.

The technical result - the reduction of energy consumption by automatically regulating the duration of the cycle, the performance of the controlled device (freezer), in particular increasing its efficiency and service life.

The technical result is achieved in that the defrosting, in particular, freezer, containing a power source, a timer, heater, sensor, defrost termination, compressor, three-prong electromagnetic relay, the movable contact of which is connected to the second pole of the power source, the total output of the time counter connected to the first fixed contact of the three electromagnetic relays and through the compressor is connected to the first pole of the power source is further provided with a pulse generator with selectable frequency and trigger setting input connected to the output of the time counter, the trigger output is connected to the control winding of the three electromagnetic relays and control input pulse generator with switchable frequency synchronization input of which is connected to the second stationary contact trekko the key and heater, the other output of which is connected with the second fixed contact of the three-prong electromagnetic relay, and the second output of the sensor defrost termination connected to the first pole of the power source, with the total output of the time counter are connected to a common output trigger and the total output of the pulse generator with selectable frequency, the output of which is connected to the counting input of the time counter.

Comparative analysis with known systems thawing shows that the claimed solution can optimally solve the problem of reducing energy consumption, increasing efficiency and service life.

The essential features of the claimed defrosting, in particular, freezer, allowing you to obtain this result, you should include the fact that the additional introduction to the defrosting of the pulse generator with selectable frequency and trigger, provides automatic control of operating time of the compressor 3, depending on the actual duration of the defrost snow "coats", reduces the power consumption of the device. In addition, the input impedance input sync pulse generator with switchable frequency substantially greater than the resistance heating is on of the motor 4, reducing the energy intensity of the claimed device.

The drawing shows a block diagram of defrosting, in particular, of the freezer.

Defrost contains the time counter 1, relay 2, a compressor 3, a heater 4, the sensor defrost termination 5, the pulse generator with switchable frequency 6, the trigger 7, the first pole of the power source 8, the second pole of the power source 9 and the movable contact 10 three-prong electromagnetic relay 2.

The movable contact 10 three-prong electromagnetic relay 2 is connected to the second pole 9 of a power source. The total output of the time counter 1 is connected with a fixed contact 10 three electromagnetic relays 2 and through the compressor 3 is connected to the first pole of the power source. Installation input trigger 7 is connected with the output of the time counter 1, and the output of the trigger 7 is connected with the control winding of the three electromagnetic relays 2 and control input pulse generator with switchable frequency 6, the synchronization input of which is connected to a normally open fixed contact "b" three-prong electromagnetic relay 2. The reset input of the trigger 7 is connected to the connection point between the sensor defrost termination 5 and the heater 4, the second conclusion is that the cat is Chica defrost termination 5 is connected to the first pole 8 power source. The General conclusion of the trigger 7 and the total output of the pulse generator with switchable frequency 6 are connected to the common output of the time counter 1. The output of the pulse generator with switchable frequency 6 connected to the counting input of the time counter 1.

The device operates as follows.

When the supply voltage of the movable contact 10 three-prong electromagnetic relay 2 is in a normally closed condition, "a", while the circuit of the compressor 3 current flows, providing his work. After a set of cold contact sensor defrost termination 5 are closed and the circuit of the first pole 8 power source - sensor defrost termination 5 - heater 4 - input synchronization pulse generator 6 receives the supply voltage, starting his work. (Input impedance input sync pulse generator 6 is considerably greater than the resistance of the heater 4, so the current flowing in this circuit is negligibly small and does not cause heating of the heater 4.) The pulses from the output of the pulse generator 6 with a period of t1 is fed to the input of the time counter 1. After filling half of the capacity of the time counter 1 at its output appears differential voltage that sets the trigger 7 in one state. Tension is the beat 10 which is switched to position "b" and the supply voltage from the second pole 9 is supplied to the heater 4, begins the process of thawing snow "fur." The voltage output from the trigger 7 is supplied to the control input of the switching frequency F of the pulse generator 6, while the output of the last pulses appear with a period of t2 < t1, continue filling in the time counter 1, but with greater speed. After filling the time counter 1 is the return to the initial state and the transition to a new filling cycle. In the optimal case, this point coincides with the end of defrost, that is, the break contacts of the sensor defrost termination 5, the reset input R of the trigger 7 is supplied voltage from the second pole of the source 9 through the resistance heater 4 and the movable contact three-prong electromagnetic relay 2 in position "b". The trigger 7 is returned to its original position, three-prong electromagnetic relay 2 de-energized and its movable contact 10 moves to position "a" by turning off the heater 4 and including a compressor 3.

If for thawing snow "coats" takes more time, the contact sensor defrost termination 5 remain in the closed state, the voltage at the reset input R of the trigger 7 is not supplied, the movable contact 10 three-prong electromagnetic relay LSI with the period t2, carrying out the filling from the initial state. Filling the time counter 1 pulse period t2 until the actual defrost termination, i.e., make-before-break contacts of the sensor defrost termination 5. This three-prong electromagnetic relay 2 is returned to its original state, and the device moves to a new cycle, however, the accumulation of pulses in the time counter 1 starts with a nonzero status, defined by the number of pulses t2, received at the input of the time counter 1 since its overflow to the actual defrost termination. As a consequence, the subsequent period of operation of the compressor will be shortened accordingly decreases the amount of snow "coats" and the time required to defrost in the next cycle. A similar process, but with the opposite sign occurs if the actual time defrost was less than the specified value.

Thus, there is an automatic time adjustment operation of the compressor 3, depending on the actual duration of the defrost snow "fur." This dependence is determined by the following relation: dtk=-(t1/t2).dt0where dtk- net change operating time of the compressor 3; dtofrom the th frequency 6 in the cooling mode; t2 is the period of the pulses of the pulse generator with switchable frequency of 6 in the "defrost".

As a pulse generator with switchable frequency can be used, for example, a binary counter with selectable division factor.

The use of the claimed defrosting, in particular, the freezer will increase the service life.

Claims

Defrost, in particular, freezer, containing a power source, a timer, heater, sensor, defrost termination, compressor, three-prong electromagnetic relay, the movable contact of which is connected to the second pole of the power source, the total output of the time counter connected to the first fixed contact of the three electromagnetic relays and through the compressor is connected to the first pole of the power source, characterized in that it is further provided with a pulse generator with selectable frequency and trigger setting input connected to the output of the time counter, the trigger output is connected to the control winding of the three electromagnetic relays and control input pulse generator with switchable frequency synchronization input which is otklyuchen to the connection point between the sensor end of the defrost and heater, the other output of which is connected with the second fixed contact of the three-prong electromagnetic relay, and the second output of the sensor defrost termination connected to the first pole of the power source, with the total output of the time counter are connected to a common output trigger and the total output of the pulse generator with selectable frequency, the output of which is connected to the counting input of the time counter.

 

Same patents:

The invention relates to refrigeration and defrosting of the evaporators of refrigerating chambers using electric heating

The invention relates to a defrosting device for controlling the operation of the defrosting of the evaporators associated with the freezing and refrigerating chambers of the refrigerator, and method of operating such a device

The invention relates to refrigeration, and in particular to steam refrigeration machines, and can find application in refrigeration equipment for the food and dairy and meat industry, trade and public catering, refrigerated transport

Defrosting timer // 2246803

FIELD: automation; periodic turn-on of actuating mechanisms of ac automatic-control devices.

SUBSTANCE: proposed defrosting timer has power supply, time counter, heater, end-of-defrosting sensor, compressor, first rectifier, first and second dropping components, and three-contact relay; movable contact of the latter is connected to second pole of power supply; count input of time counter is connected through heater to second fixed contact of relay and through end-of-defrosting sensor, to first pole of power supply. Common lead of time counter is connected to first fixed contact of relay and through compressor, to first pole of power supply. Inputs of first rectifier are inserted between fixed change-over contacts of three-contact relay through first dropping component; output of first rectifier is connected to that of time counter through series-connected threshold element and relay coil. Newly introduced in timer is second rectifier one of whose inputs is connected through second dropping component to second pole of power supply, and its other input is connected to first fixed contact of relay; second rectifier output is connected to time counter output also through series-connected threshold element and relay coil.

EFFECT: reduced power requirement due to lower operational loss and enlarged functional capabilities of timer.

1 cl, 1 dwg

FIELD: refrigerator automatics.

SUBSTANCE: timer has power source, time counter, heater, defrosting pickup, compressor, three-contact relay, two rectifiers, and first and second quenching members. The common lead of the time counter is connected with the movable contact of the three-contact electromagnetic relay. The defrosting pickup is connected between the inlet of the time counter and the second unmovable contact of the relay. The heater is connected between the input of the time counter and the first pole of the power source. The outputs of the second rectifier are connected with the movable contact of the relay and first movable contact of the relay through the second quenching member.

EFFECT: reduced power consumption and enhanced design.

1 dwg

FIELD: refrigeration automatics.

SUBSTANCE: timer comprises power source, time counter, heater, detector of termination of defrosting, compressor, three-contact relay, two single-period rectifiers, and first and second quenching elements. The common output of the time counter is connected with the second pole of the power source. The counting input of the time counter is connected to the second unmovable terminal of the relay through the detector of termination of defrosting and with the first pole of the power source through the heater. The output of the time counter is connected with the unmovable contacts of the relay through three chains defined by the winding and threshold unit, first rectifier and first quenching unit, second rectifier and second quenching unit.

EFFECT: reduced sizes.

1 dwg

Air cooler // 2256858

FIELD: air coolers.

SUBSTANCE: air cooler has cooling battery and tray. Electric heater is placed inside hollow space of the tray. Electric heater is made elastic to be snug against to the lower surface of top sheet and to be covered with insulation.

EFFECT: reduced time for thawing of air coolers; reduced consumption of energy for production of cold.

2 dwg

FIELD: mechanics.

SUBSTANCE: invention relates to a refrigerating apparatus with a thermal insulation cabinet (1) enclosing a refrigeration chamber (2) with an evaporator (7) being set in the cabinet and with an ice layer (13) being formed on the evaporator surface. Two temperature sensors (12, 14) are fitted close to the evaporator (7) so that only one temperature sensor (12) is buried in the ice layer (13). The control circuit (10) is connected to the two temperature sensors (12, 14) so that to define difference of the temperatures measured by the temperature sensors and so that depending on the defined difference to turn or not to turn on the evaporator (7) defrostation by applying an output signal; the above definition is carried out in case the temperature alteration speed measured by at least one of the two sensors (12, 14) falls below the specified limit.

EFFECT: increasing refrigerating apparatus reliability.

7 cl, 4 dwg

FIELD: mechanics.

SUBSTANCE: invention refers to automatics. Refrigerator defrosting timer includes power supply, timer, heater, defrosting finish sensor, compressor, rectifier, extinguishing element, voltage suppressor, threshold element, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Common leg of timer is connected with first fixed relay contact and through compressor - with power supply first pole. Timer inverting input is connected with second fixed relay contact through heater and with power supply first pole through defrosting finish sensor. Timer output is connected with second fixed relay contact through two series-connected circuits. On one side the first circuit is formed by series-connected relay winding and threshold element, on the other side the second circuit is formed by series-connected rectifier and extinguishing element. The first and the second circuit common point is connected with timer common leg through voltage suppressor. According to the second version the device includes power supply, timer, heater, defrosting finish sensor, compressor, rectifier, extinguishing element, voltage suppressor, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Common leg of timer is connected with first fixed relay contact and through compressor - with power supply first pole. Timer inverting input is connected with second fixed relay contact through heater and with power supply first pole through defrosting finish sensor. Timer output is connected with relay winding first output, the second output of which is connected with second fixed relay contact through series-connected rectifier and extinguishing element. Common point of relay winding second output and circuit formed by series-connected rectifier and extinguishing element is connected with timer common leg through voltage suppressor. Timer has additional control input connected with voltage suppressor. Timer receives a signal about power in the circuit after emergency shutdown through this additional input.

EFFECT: creation of refrigerator defrosting timer.

7 cl, 7 dwg

FIELD: mechanics.

SUBSTANCE: invention refers to automatics. The device includes power supply, timer, heater, defrosting finish sensor, compressor, voltage suppressor, first and second rectifiers, first and second extinguishing elements, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Timer inverting input is connected with power supply first pole through heater and with second fixed relay contact through defrosting finish sensor. Timer common leg is connected with power supply second pole. Timer output is connected with second fixed relay contact through two series-connected circuits. The first circuit is formed by relay winding and threshold element. The second circuit is formed by first rectifier and first extinguishing element. Common point of the first and the second circuits is connected with timer common leg through voltage suppressor and with first fixed relay contact through circuit of series-connected second rectifier and second extinguishing element (the third circuit). The first fixed relay contact is connected with power supply first pole through compressor. According to the second version the device includes power supply, timer, heater, defrosting finish sensor, compressor, voltage suppressor, first and second rectifiers, first and second extinguishing elements, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Timer common leg is connected with power supply second pole. Timer inverting input is connected with power supply first pole through heater and with second fixed relay contact through defrosting finish sensor. Timer output is connected with relay winding first output, the second output of which is connected with the second fixed relay contact through series-connected first rectifier and first extinguishing element. Common point of relay winding second output and circuit formed by series-connected first rectifier and first extinguishing element is connected with timer common leg through voltage suppressor and with fixed first relay contact through circuit of series-connected second rectifier and second extinguishing element. The first fixed relay contact is connected with power supply first pole through compressor. Timer is performed with additional control input connected with voltage suppressor. Additional control input provides the possibility for timer to receive a signal about power in the circuit after emergency shutdown.

EFFECT: structure simplification, increase of operation safety at the expense of decreasing the requirements for timer elements permissible work voltage, decrease of discrete elements quantity, facilitation of optimal version choice for certain conditions of use.

3 cl, 3 dwg

FIELD: heating.

SUBSTANCE: invention relates to refrigerating machine with built-in heater (8) of defrost system, provided with measuring device (10, 12) for measuring voltage on feeding outlets (11) of defrost system heater (8) and for generation of modulated driving signal with mark-to-space ratio depending on measured voltage value. Interrupter (9) of current supplied to defrost system heater (8) is put into operation by driving signal. Mark-to-space ratio of feeding voltage changes depending on measured voltage in order to limit fluctuations of power of defrost system heater caused by voltage fluctuations.

EFFECT: efficiency of defrost system and increase of defrost system heater economy.

11 cl, 3 dwg

FIELD: heating systems.

SUBSTANCE: cooling unit includes heat-insulated housing (1) enveloping cooling chamber (2), evaporator (7) installed in air channel (4, 5) interconnected with cooling chamber (2), heating device (8) for heating evaporator (7) and control diagram (10) to control operation of heating device (8). Control diagram (10) is connected to signal transmitting measuring device installed in air channel (4, 5) and characterising air flow passing through channel (4, 5), and is provided with possibility of switching on heater (8) when measured air flow decreases below some limit value. Measuring device has two temperature sensors installed in various proximity as to heat to heat source or to heat flux sink, or to air in channel (4, 5). Control diagram (10) has the possibility of determining air flow decreased below limit flow value when difference of temperatures measured with two sensors is beyond limit temperature difference value.

EFFECT: simplifying and improving cooling unit reliability.

5 cl, 5 dwg

FIELD: heating.

SUBSTANCE: proposed device comprises at least one pipe for refrigerator coolant and cooling ribs in heat contact with coolant pipe. Note here that said pipes and/or ribs make resistive heater and at least switch to feed electric power to said resistive heater that generates heat for removal of ice from pipes and/or ribs.

EFFECT: minimum power consumed for ice removal from fringe surface.

49 cl, 35 dwg

FIELD: refrigerator automatics.

SUBSTANCE: timer has power source, time counter, heater, defrosting pickup, compressor, three-contact relay, two rectifiers, and first and second quenching members. The common lead of the time counter is connected with the movable contact of the three-contact electromagnetic relay. The defrosting pickup is connected between the inlet of the time counter and the second unmovable contact of the relay. The heater is connected between the input of the time counter and the first pole of the power source. The outputs of the second rectifier are connected with the movable contact of the relay and first movable contact of the relay through the second quenching member.

EFFECT: reduced power consumption and enhanced design.

1 dwg

FIELD: refrigeration automatics.

SUBSTANCE: timer comprises power source, time counter, heater, detector of termination of defrosting, compressor, three-contact relay, two single-period rectifiers, and first and second quenching elements. The common output of the time counter is connected with the second pole of the power source. The counting input of the time counter is connected to the second unmovable terminal of the relay through the detector of termination of defrosting and with the first pole of the power source through the heater. The output of the time counter is connected with the unmovable contacts of the relay through three chains defined by the winding and threshold unit, first rectifier and first quenching unit, second rectifier and second quenching unit.

EFFECT: reduced sizes.

1 dwg

Timer // 2353996

FIELD: physics.

SUBSTANCE: timer comprises power supply source, time counter, heater, detector of defrosting completion, compressor, rectifier, quenching element, voltage limiter, three-pin electromagnet relay, movable contact of which is connected to the second pole of power supply source; common lead of time counter is connected to the first fixed relay contact and via compressor - to the first pole of power supply source; counter inlet of time counter via heater is connected to the second fixed relay contact and via detector of defrosting completion - to the first pole of power supply source; outlet of time counter is connected to the first lead of relay winding, the second lead of which via circuit of serially connected rectifier and quenching element is connected to the second fixed relay contact; common point of the second lead of relay winding and circuit formed by serially connected rectifier and quenching element is connected to common lead of time counter via voltage limiter.

EFFECT: increased reliability of operation.

1 dwg

Defrosting timer // 2353997

FIELD: physics.

SUBSTANCE: defrosting timer comprises power supply source, time counter, heater, detector of defrosting completion, compressor, voltage limiter, the first and second rectifiers, the first and second quenching elements, three-pin electromagnet relay, movable contact of which is connected to the second pole of power supply source; counter inlet of time counter via heater is connected to the first pole of power supply source, and via detector of defrosting completion - to the second fixed contact of relay; common output of time counter is connected to the second pole of power supply source; output of time counter is connected to the first output of relay winding, the second output of which via chain from serially joined first rectifier and first quenching element is connected to the second fixed contact of relay; common point of the second output of relay winding and chain of the first rectifier and the first quenching element is connected to the common output of time counter via voltage limiter and via chain of the second rectifier and second quenching element is connected with the first fixed contact of relay; the first fixed contact of relay via compressor is connected to the first pole of power supply source.

EFFECT: simplified design and increased reliability of operation.

1 dwg

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