Defrosting timer

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

 

The invention relates to the field of automation and can be used for occasional inclusions of Executive automation devices AC, for example, cooling devices.

Known timer (patent RF №2167463, etc. 03.04.2000 g)containing a power source, a timer, heater, sensor, defrost termination, compressor, three-prong relay, the movable contact of which is connected to the second pole of the power source, the counting input of the counter time through the heater is connected to the second stationary contact of the relay and through the sensor defrost termination is connected to the first pole of the power source, the total output of the time counter connected to the first stationary contact of the relay and through the compressor is connected to the first pole of the power source, and the output from the first output winding of the relay, the second output winding of the relay connected to the second pole of the power source via the included controlling circuit representing serially connected threshold element, the rectifier and the first ballast resistor, the input rectifier connected between the stationary switching contacts three electromagnetic relays via a second ballast resistor.

The resistors in the famous diagram of the timer are absorbing elements and are designed to absorb the voltage source feed is. While the main function of the second ballast resistor - accumulation of energy at the output of the rectifier is sufficient to relay.

In the operation of the relay (switching its movable contact from position “a” to position “b”) parallel to the second ballast resistor connects the first ballast resistor whose main function is to provide in conjunction with a second ballast resistor hold the relay in srabotanno condition.

A disadvantage of the known circuit timer are significant energy losses at the output of the rectifier associated with the fact that when the movable contact of the relay in the initial position “a” (before the relay), the first ballast resistor is connected in parallel to the rectifier, i.e. the first ballast resistor bypasses the rectifier. Through the first ballast resistor current leakage, power supply rectifier. The lower the resistance value of the first ballast resistor, the greater the leakage current flowing through this resistor.

With increasing resistance values of the first ballast resistor reduces the ability to hold a three-prong relay in srabotanno state (position “b” of the rolling contact of the relay). In position “b” of the rolling contact of the relay of the first and second ballast R is shistory included in parallel, therefore, when significant resistance values of the first ballast resistor voltage at the rectifier output may not be sufficient to hold the relay.

Thus, the resistance value of the first ballast resistor depends on the resistance values of the second ballast resistor and the magnitude of current necessary to keep the relay. Choosing each of these circuit elements are dependent on each other and constrained to each other.

The technical problem solved by the invention is the reduction of electricity consumption by reducing its losses in the process timer, to increase the degree of universality of the timer.

The problem is solved in that the defrost timer, containing a power source, a timer, heater, sensor, defrost termination, the compressor, the first rectifier, the first and second restraining elements, three-prong relay, the movable contact of which is connected to the second pole of the power source, the counting input of the counter time through the heater is connected to the second stationary contact of the relay and through the sensor defrost termination is connected to the first pole of the power source, the total output of the time counter connected to the first stationary contact of the relay and through the compressor is connected to the first pole of the power source, the input of the first rectifier included IU the remote control fixed switching the three-prong contacts of the relay through the first absorbing element, the output of the first rectifier is connected with the output of the time counter connected in series through the threshold member and the winding of the relay, put the second rectifier, while one input of the second rectifier through the second absorbing element is connected with the second pole of the power source and the other input of the second rectifier connected to the first stationary contact of the relay, the output of the second rectifier is connected with the output of the time counter is also connected in series through the threshold element and the relay coil.

In the proposed scheme the timer first and second rectifiers connected in parallel. Current when the contact is in position “a” flows only through the first absorbing element. When the movable contact in position “b” the current flows through both of the restraining member, through the first absorbing element, the current at the input of the first rectifier, and a second restraining element, the current at the input of the second rectifier. With outputs of both rectifiers current, adding, to the input of the threshold element.

Thus, due to the lack of circuit elements (in this case the quenching elements)connected in parallel with the rectifiers in the power of the latter does not occur in unnecessary loss of energy.

In the proposed scheme, a timer the primary function of the first absorbing element is ensuring the accumulation of energy in the course of the first rectifier, sufficient for operation of the relay. The main function of the second restraining element software in conjunction with the first retaining three-prong relay in srabotanno condition.

As quenching can be selected such elements, which provide damping excessive voltage by its resistance (active or reactive). The value of the energy accumulated in rectifier output is inversely proportional to the magnitude of this resistance.

The magnitude of this resistance is the main characteristic of the absorbing element.

The choice of the value of the basic characteristics of the first absorbing element is determined only necessary response time three-prong relay. The choice of the value of the basic characteristics of the second restraining element is determined solely by how its value will be holding relay in srabotanno condition. The choice of the values of the basic characteristics of both the quenching of the elements is determined only by the above conditions and does not depend on the value of the basic characteristics of the other of the restraining element, because when the timer both quenching element do not affect each other.

Thus, reduced energy losses during operation of the timer, as well as increasing its versatility due to the fact that the choice of circuit elements (first and second Gerasimenko) is determined only by their functions and independent from one another, making fewer restrictions to change some characteristics of the timer (for example, the time delay relay after issuing a signal meter or consumption of timer mode operation of the compressor depending on the conditions of its use.

The prior art is not revealed structures timers, characterized by the claimed combination of features, therefore, the present invention meets the patentability criteria of “novelty.”

The claimed combination of features of the invention enables a reduction of power consumption by reducing its losses in the process timer, to increase the degree of universality of the timer is compared with the known from the prior art, leads to the conclusion that the claimed invention meets the patentability criterion of “inventive step”.

The drawing shows a block diagram of the timer.

The timer contains:

1. The time counter.

2. Three electromagnetic relays.

3. The threshold element.

4. The rectifier 1 power.

5. The rectifier 2 power.

6. Resistor 1.

7. The resistor 2.

8. Switching the three-prong contacts of the electromagnetic relay.

9, 10, 11. The elements of the periodic inclusion of the managed device; (9 - heater; 10 - sensor defrost termination; 11 - compressor).

12. P is pout pole of the power source.

13. The second pole of the power source.

The movable contact of the relay 2 is connected to the second pole of the power source 13. The counting input of counter 1 time through the heater 9 is connected to the second stationary contact of the relay 2 and through the sensor 10 defrost termination is connected to the first pole 12 to the power source. The total output of counter 1 time connected through the normally closed contact "a" of the switching contacts 8 of the electromagnetic relay 2 with the second pole 13 of the power source and through the compressor 11 with the first pole 12 to the power source. The output of counter 1 is connected to the first output winding of the relay 2. The inputs of the rectifier 4 is included between the fixed contacts "a" and "b " via the resistor 6. The output of the rectifier 4 is connected with the second output winding of the relay 2 through the threshold element 3. The first input of the rectifier 5 through the resistor 7 is connected with the second pole 13 of the power source, the other input of the rectifier 5 is connected to the contact “a” relay 2; the output of the rectifier 5 is connected to the input of the threshold element 3.

The device operates as follows.

The timer included in the system defrost the refrigerator.

When the supply voltage is movable relay contact 2 is in the normally-closed state "and" switching contacts 8.

From the second pole 13 of the power supply current through the normally-closed contact a, the counter 1 and the sensor 10 defrost termination x is Hladilnika, contacts which are closed after a set of cold, is supplied to the first pole 12 of the power source, providing operation of the counter 1 starts to count the operating time of the compressor 11, is proportional to the number of fluctuations of the supply voltage (or internal clock). Due to the relatively high resistance of resistor 6, the current flowing through the heater 9, is negligible and the heater 9 is not working.

At the same time, the following circuit: the second pole 13 of the power source, a normally closed position and the contacts 8 of relay 2, the rectifier 4 through the resistor 6, a broken heater 9, closed (after dialing cold) contacts of defrost sensor 10, the first pole 12 of the power source voltage is applied to the inputs of the rectifier 4 and starts the transition process of establishing its output voltage. When you reach a voltage sufficient for reliable operation of the electromagnetic relay 2 opens the threshold element 3 and supplies the supply voltage to the second contact of the winding of an electromagnetic relay 2. The relay 2 and the switching contacts 8 in position "b" will occur upon the submission to the first winding of the relay coil 2 is required voltages from the output of the counter 1, the corresponding time interval. When the switching contact 8 from position "a" to position "b" turns on load, the educational element 9 (closed contacts of the sensor 10 defrost termination), starts the defrosting of the refrigerator. At the same time, voltage is applied to the rectifier 5 through the circuit: the second pole 13 of the power source, a quenching resistor 7, a rectifier 5, a broken compressor 11, the first pole 12 to the power source. From the output of the rectifier 5, the current is fed to the input of the threshold element 3. Thus, the input of the threshold element 3 receives the current from the outputs of both rectifiers (4 and 5). Counter 1 does not consider, since the input contacts are shunted by the sensor 10 through the inoperative compressor 11.

When defrosting has occurred, when the set temperature is reached, the contacts of the sensor 10 is open. The current from the second pole 13 of the power supply through a relay contact, closed in position “b”, non-working heater 9, count 1, broken compressor 11 is supplied to the first pole 12 to the power source. The counter 1 counts the pause time after defrost.

At the end of the pause counter 1 enters the initial state, the tension is removed from the first output winding of the relay 2 and the contacts 8 switch to "a", the cycle repeats.

The defrost timer containing a power source, a timer, heater, sensor, defrost termination, the compressor, the first rectifier, the first and second restraining elements, three-prong relay, the movable contact of which is connected to the second pole of the power source, the counting input of the counter of the time through the heater is connected to the second stationary contact of the relay and through the sensor defrost termination is connected to the first pole of the power source, the total output of the time counter connected to the first stationary contact of the relay and through the compressor is connected to the first pole of the power source, the input of the first rectifier connected between the stationary switching contacts of the three relays through the first absorbing element, the output of the first rectifier is connected with the output of the time counter connected in series through the threshold element and the relay coil, characterized in that the timer input a second rectifier, with one input of the second rectifier through the second absorbing element is connected with the second pole of the power source and the other input of the second rectifier connected to the first stationary contact of the relay, the output of the second rectifier is connected with the output of the time counter also through serially connected threshold element and the relay coil.



 

Same patents:

FIELD: electrical engineering; electric heating elements for overheat-protected tubular electric heaters.

SUBSTANCE: heating element of first design alternate has high-resistivity metal wire spiral, heat-responsive section in the form of easy-melting metal alloy tube, metal plug inserted in spiral at its end disposed on heat-responsive section end, and contact in the form of metal tube secured thereon, partially fitted onto heat-responsive section, and rigidly fixed thereto. Spiral turns are joined together on length from end of spiral to at least plug to form rigid part of spiral. This rigid part is partially fitted onto heat-responsive section and joined to the latter so that distance through symmetry axis between rigid part of spiral and contact ensures opening of heating element circuit when heat-responsive section temperature exceeds critical value equal to melting point of its material. As an alternative, heat-responsive section may be soldered to metal plug. Heating element of second design alternate has two high-resistivity metal wire spirals and heat-responsive section is installed on two ends just as in first design alternate.

EFFECT: simplified design, reduced operating time of heat-responsive section.

4 cl, 8 dwg

The invention relates to the field of household appliances, in particular the production of electric kettles

The invention relates to a water heater with a large number of heating elements, namely, running or bepreserved the heater intended for almost instant heat through a fluid medium

The invention relates to electrical engineering, namely to electrical circuits for equipment

The invention relates to heating systems and, in particular, with the use of elongated electric heaters in the system of insulated pipes and containers

The invention relates to electric heaters of air and can be used for heating

Timer // 2167463
The invention relates to the field of automation and can be used for occasional inclusions of Executive automation devices AC

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

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

Up!