CN1151507A

CN1151507A - Controlling defrost in refrigerated compartment

Info

Publication number: CN1151507A
Application number: CN 96101537
Authority: CN
Inventors: J·P·杜夫
Original assignee: Eaton Corp
Current assignee: Eaton Corp
Priority date: 1995-01-06
Filing date: 1996-01-05
Publication date: 1997-06-11
Also published as: EP0721092A2; BR9600423A; EP0721092A3; CA2166571A1; JPH08254375A

Abstract

An electromechanical defrost control system for a refrigerator which uses the compressor cycling thermostat to incrementally advance a ratchet each compressor cycle. The ratchet drives a cam which closes a defrost heater selector switch when a predetermined accumulated number of compressor cycles have occurred. Upon the compartment being heated the thermostat incrementally advances the cam which returns the selector switch to the compressor operating position and de-energizes the defrost heater.

Description

The defrosting control of refrigerating chamber

The present invention relates to the particularly control procedure of automatically controlled frost removal in the refrigerating chamber of the refrigerating chamber and so on of the household electric refrigerator of mass production of refrigerator.Household electric refrigerator is to sell on the market of high competition, compete in such market, just must reduce the cost of refrigerator as far as possible.

The mutually common practice of tame so far electricity consumption ice is to adopt little fractional horse-power motor to drive the electromagnetism timer to start a switch and make refrigerating chamber defrost/the anhydrate electric heater power on/off of usefulness carry out work.Facts have proved that the electric motor driven this switching device of timer that is used to control Defrost heater is the comparison material benefit.Yet, it also is well-known that the small size motor of this synchronization timing often goes wrong under condition of work, often burn thereby be that the torque of motor is low, not only troublesome but also to change the on-the-spot service charge of defrost clock still rough high because of use therein fine rule coil current overload.The occasion that is controlled at employing all electronic controller of this Defrost heater finds that the electronic equipment of required usefulness often makes controller oppose only electromagnetic controller in the cost competition.Therefore, all wish to have a kind of method or measure just can simply and reliably defrost for a long time without the timer of timing motor driving or the electronic controller of complex and expensive to refrigerating chamber.

The purpose of this invention is to provide and need not electric motor driven timing mechanism with so that the defrosting motor of refrigerating chamber gets a kind of dynamo-electric timer electric and must not electricity.

Another object of the present invention is to power to Defrost heater after the on/off circulation of the every process cumulative frequency of refrigerating chamber with electromechanical assembly.

The invention provides a kind of selector switch of cam control, to select to make the compressor or the Defrost heater work of refrigerator.Cam is controlled by a propulsive mechanism that advances in each on/off cyclic process of compressor, and is to work when accumulative total advances pre-determined number, and selector switch is switched to the position of connecting the Defrost heater circuit from the position to the compressor power supply.At propulsive mechanism next time during forward impelling, selector switch is added to and makes the position that Defrost heater must not electricity and select compressor operating position.Propulsive mechanism is a ratchet mechanism preferably, and wherein the ratchet of Tui Jining makes its swing by jockey, and jockey then is the form of link mechanism, by the temperature-sensing element driving of refrigerating chamber.The humidity sensor element makes the line power switch work of the selector switch that connects cam control and quits work.Freezer temperature sensor moves forward and backward ratchet with freezer temperature sensor during open and close at line switching at every turn.Defrost heater is malfunctioning and by an independent temperature sensor Defrost heater is quit work when refrigerating chamber is warmed at the temperature sensor of compressor control.

Accompanying drawing is to use the compressor for refrigeration of the principle of the invention and the control system schematic diagram of Defrost heater.

Referring to accompanying drawing.Control system 10 of the present invention has a refrigerating chamber 12 that gets up to represent with the dot-dash wire frame, and the temperature sensing device 14 such as radiator valve or thermostat is housed in the refrigerating chamber.Controller 14 is being controlled

propulsive mechanism

20, and 20 of propulsive mechanisms make selector switch 16 operations of cam 18 controls.Propulsive mechanism 20 actuating cams advance, and are connected with thermostat 14 during work, and this point is represented by dotted lines in the drawings.

Selector switch 16 is selected with regard to two positions, one be make refrigerant condenser work, usually away from the position of refrigerating chamber 12, another is to make Defrost heater work, usually and the position that links of refrigerating chamber 12.

Thermostat 14 has a line switching 24, and the acting arm 26 of switch 24 meets an end L1 of power line, and fixed contact 28 connects the public terminal of switch 16, and switch 16 is single-pole double throw switch preferably.Switch 16 contact 30 on one side connects abutment 32, and 32 at abutment connects an end of compressor 22 and an end of refrigeration fan motor 34.Another termination power line of compressor 22 is at the abutment 36 of its L2 end, and another termination power line of fan 34 is at the abutment 38 of its L2 end.

The contact 40 of switch 16 another sides connects an end of Defrost heater 25, a terminal of another termination thermostat 42 of Defrost heater 25, the power supply abutment 44 of the other end link L2 of thermostat 42.Switch 42 is by defrosting temperature sensor 46 controls that link with refrigerating chamber 12.

Switch 16 is displaced to by offset assembly suitable such as spring 48 and makes contact 30 closures, compressor get electric position, and its cam follower 50 is located on the swing arm of switch.

Propulsive mechanism 20 preferably has one to advance ratchet 52 to engage with the gear teeth 54 of ratchet 56 when moving upward, and is connected with the cam 18 that is rotating when the gear teeth 54 rotate, shown in the dotted line among the figure.Ratchet 52 is connected with the component-bar linkage of swinging with the motion of constant temperature sensing element 60 58.Component-bar linkage 58 also is connected with the switch arm 26 of switch 24 with pin 62 together with idle running band otch joint, shown in the dotted line among the figure.

In case of necessity, door switch 64 can be connected in series with interior lighting 66.

It should be understood that, during work, be subjected to the promotion of ratchet 52 and rotate forward and be accumulated to predetermined times (generally be about compressor 8 to 12 times cycle-index) afterwards at ratchet 56, cam 18 just affacts on the cam follower 50, make switch 16 switch to the solid line position shown in the figure from the dotted line position shown in the figure, so that contact, make Defrost heater get electric and make the compressor must not with the contact 40 of side.White heater falls when making the temperature of refrigerating chamber 12 rise to predetermined value, temperature sensor 60 actions, impel the line switching closure, and component-bar linkage 58 is moved, ratchet 52 is return back to be enough to the amount that ratchet 56 and cam 18 are progressively rotated forward, thereby make switch 16 get back to chain-dotted line shown in the figure, come to the position on the contact 30, and make compressor again.

Therefore the invention provides a kind of timing mechanism, novel unique Mechatronic Systems that need not drive motor in order to power after refrigerant condenser accumulation cycle several times, for the refrigerator Defrost heater.

Though be above just for embodiment introduce of the present inventionly, self-evidently can do various modifications to the present invention and change and change, the present invention only is subjected to the restriction of following claims.

Claims

1. have a kind of defrost control system of the refrigerator of refrigerating chamber, it is characterized in that it comprises:

(a) compression set can be worked during energising, cools off the refrigerant that refrigerating chamber is used with circulation;

(b) heater can be worked during energising, supplies with described refrigerating chamber defrosting;

(c) temperature sensing device, the temperature that reaches certain certain level according to described refrigerating chamber during work make executing agency's work;

(d) pawl device makes its swing by described executing agency,

(e) pawl device is promoted to advance by described ratchet device during work, and a cam is arranged for therewith before migrating;

(f) first switching device, having a cam follower device to change the accumulation several times before cam moves it by described cam afterwards between the primary importance and the second place, it is electric that described switching device only just makes described compressor get when described primary importance, and described heater is got;

(g) second switch device, link together with described first switching device, and be connected with described executing agency, wherein said sensing device is worked when described first switching device is in described primary importance, open and the described second switch device that closes, thereby, make described compression set periodic duty according to the variations in temperature of described refrigerating chamber.

2. control system as claimed in claim 1.It is characterized in that described first switching device is made up of single-pole double throw switch.

3. control system as claimed in claim 1 is characterized in that it also comprises offset assembly, makes described first switching device be displaced to primary importance.

4. control system as claimed in claim 1 is characterized in that, described cam is a turning cam.

5. have a kind of defrost control system of the refrigerator of the motor compressor of using for the refrigerant of circulation cooling refrigerating chamber, it is characterized in that it comprises:

(a) temperature sensing device, the temperature of certain level that reaches according to described refrigerating chamber during work make executing agency's action;

(b) heater defrosts to described refrigerating chamber during energising;

(c) selector switch device is worked when connecting power supply, and is moved between first and second states, so that described compression set or described heater are worked under first state, another device in this stream oriented device is worked under second state;

(d) calculation element, connect to such an extent that its each action with described executing agency is progressively advanced, and when described propelling is accumulated to predetermined times, impel described selector switch between first and second state, to switch, and the next one afterwards impel described selector switch to get back to described first state in progressively advancing;

(e) line switching device is connected in series with described selector switch device, and when work be connected with described executing agency so that according to detected variations in temperature in the described refrigerating chamber make described compressor get electric with must not.

6. control system as claimed in claim 5 is characterized in that, described calculation element has a rotating cam to be advanced by ratchet device, and described ratchet is connected with described executing agency.

7. defrost control system as claimed in claim 5 is characterized in that described selector switch is made up of single-pole double throw switch.

8. defrost control system as claimed in claim 5 is characterized in that it also comprises offset assembly, in order to described selector switch is displaced to described primary importance.

9. defrost control system as claimed in claim 5 is characterized in that, described integrating device has a rotating cam to drive rotation by a ratchet, and ratchet is then by the ratchet gearshift with the swing of described executing agency.

10. control system as claimed in claim 5 is characterized in that, described line switching device is made up of thermostat.

11. a kind of method by control defrost process in the refrigerating chamber of the automatically controlled compressor cooling of circulating frozen agent.It is characterized in that it comprises the following steps:

(a) be equipped with a temperature-sensitive starter, starting the power circuit switch when detected temperature value is higher than first temperature value, that compressor is got is electric, impels described switch to be failure to actuate when detected temperature value is lower than second temperature value, thereby makes the compressor must not;

(b) along with each make compressor get electric and must not the electricity circulation progressively promote a cam forward;

(c) according to described cam progressively promoted to be accumulated to certain number of times the time will power and switch to Defrost heater from electric compressor;

(d) when described cam is progressively promoted successively, will power next time and switch to compressor from Defrost heater.

12. method as claimed in claim 11 is characterized in that, described progressively the promotion forward is to impel a ratchet to swing with described executing agency, and the promotion ratchet that is connected with cam carries out.

13. pass through a kind of defrost control system of the refrigerating chamber of Cyclic Rings refrigerant cooling, it is characterized in that it comprises:

(a) compression set is worked during energising, uses for carrying out described refrigerant circulation;

(b) heater is worked during energising, for described refrigerating chamber is carried out defrosting;

(c) temperature sensing device reaches certain uniform temperature according to the temperature in the described refrigerating chamber during work and makes executing agency's action;

(d) propulsion plant, during work by described executing agency each on/off endless-walk forward impelling at described compressor;

(e) the described stepping of the described executing agency of response advances cam gear,

(f) selector switch device is subjected to the described propulsion plant of being controlled at of described cam gear to select to impel when progressively forward impelling is accumulated to certain number of times to select described heater to work.

(g) line switching device is opened described selection to produce to receive on the power supply or from power supply according to the action of described executing agency during work and is excised.