RU2303210C2 - Device for domestic refrigerator - Google Patents

Abstract

FIELD: refrigeration engineering.

SUBSTANCE: device comprises compressor motor, condenser, evaporator of freezing compartment, evaporator of positive temperature compartment, and sucking pipeline. The main capillary tube operates at positive temperatures and additional capillary tube together with the main capillary tube operates at low temperatures. The outlets of the evaporators are connected with the compressor motor provided with the control system that has temperature control unit and switch connected with it. The main capillary tube is connected with the evaporator of the positive temperature compartment through a check valve that is mounted at the entrance to the evaporator of the freezing compartment. The outlet of the additional capillary tube is connected with the inlet of the evaporator of the freezing compartment.

EFFECT: expanded functional capabilities.

1 cl, 8 dwg

Description

The invention relates to refrigeration. Domestic refrigerators are known, both single-chamber, two-chamber and three-chamber, the latter differ from the former in the presence of two evaporators and two evaporators and two refrigerated compartments.

A refrigerator is known in the art (SU No. 10557753, F25D 11/02, 1982).

The cooling system is known from the prior art (SU No. 1601473, F25B 1/00, 1990).

A disadvantage of the known solution is: cooling the positive compartment of the refrigerator with a low temperature mode in accordance with the temperature level in the freezer compartment, the unit cannot work separately for the plus or freezer compartment, cannot work only for the freezer compartment, cannot ensure all branches are negative (below 0 ° C ) temperature.

The closest analogue is the application FR No. 2493491, F25D 11/02, 1982), which characterizes a domestic refrigerator unit containing consecutively installed in the compressor motor refrigerant circuit, a condenser, a freezer compartment evaporator and a plus compartment evaporator and a suction pipe, with the main capillary tube is designed for positive operation, and the additional capillary tube in total with the main one is designed for low-temperature operation, and the outputs of these evaporators are connected to the compressor motor .

The objective of the invention is to create two or more modes of the cooling system, as well as expanding the functionality of the unit, for example, in the trade in beverages, when a negative temperature is not required or, on the contrary, only a negative temperature is needed.

To each temperature level of the refrigerator compartment there is a corresponding compressor operation mode.

The technical result, which consists in eliminating these shortcomings in the unit of a household refrigerator, containing a compressor motor, a condenser, a freezer compartment evaporator and a plus compartment evaporator and a suction pipe, sequentially installed in the refrigerant circuit, while the main capillary tube is designed for plus mode of operation, and the additional capillary the tube in total with the main one is designed for low-temperature operation, and the outputs of these evaporators are connected to the compressor motor, for This is ensured by the fact that it has a control system consisting of a thermostat and a switch connected to it, while the main capillary tube is connected to the plus compartment evaporator through a check valve that is installed at the outlet of the freezer compartment evaporator, and the input of the freezer evaporator is connected to the outlet of the additional capillary tube branches.

A second additional capillary tube may be connected between the main capillary tube and the check valve.

The device is illustrated by drawings.

Figure 1 presents a schematic diagram of the cooling system of the unit, which contains the main capillary tube 1, corresponding to the positive mode of the valve 2 and the additional capillary tube 3 connected to it, the inlet of the evaporator 4 of the plus compartment is connected to the valve 2, the inlet of the evaporator 5 is connected to the outlet of the tube 3 freezer compartment. The outputs of the evaporators through the suction pipe are connected to the compressor (not shown in the drawing).

In figure 2, between the tube 1 and valve 2, an additional capillary tube 6 is connected, and the output of the evaporator 5 is connected to the input of the evaporator 4 (possibly through an injector).

In figure 3, the tube 3 is connected to a normally open valve 2, and the tube 6 with a closed valve 2. The output of the evaporator 5 with the input of the evaporator 4 is connected through a check valve 7.

In Fig.4, 4a, 4b, 4c, 4d - circuit diagram of the unit.

Figure 4 presents a schematic electrical diagram of the unit, consisting of a low-temperature thermostat 8, a two-pin switch 9, a motor-compressor 10 connected in series.

The switching contact of the positive thermostat 14 is connected to the output of the thermostat 8, the valve winding 2 is connected to the normally closed contact of it, and the normally closed contact of the switch 9, fan 12, and limit switch 13 are connected to the normally open contact.

Adding other elements to the circuit does not matter for the inherent functions of the refrigerator unit.

The unit operates as follows.

When power is supplied to thermostat 8, then switch 9, the motor-compressor 10 will work.

When the circuit is created in parallel, thermostat 8 - thermostat 11 closes the winding of valve 2, having worked, it will provide the supply of refrigerant to the evaporator 4. The motor-compressor 10 will start up in positive mode.

When the lower temperature level is reached, thermostat 11 will deenergize valve 2, the flow of refrigerant to the evaporator 4 will be shut off, and the refrigerant through the additional capillary tube 3 will be supplied to the evaporator 5 with lower pressure in accordance with the values of the freezing mode.

The thermostat 11, having switched the contacts, locks the fan 12 through the normally closed contact of the switch 9 and the normally closed limit switch 13 of the freezer compartment door.

Upon reaching the lower temperature level in the freezer 5, the thermostat 8 will de-energize all electrical circuits (Figs. 1 and 4b).

To obtain positive temperatures in all compartments of the refrigerator, switch 9 must be moved to another position, the thermostat 11 must be adjusted, turn its knob counterclockwise, and an electrical circuit is created.

Thermostat 8, thermostat 11, switch contact 9, compressor motor 10, as well as thermostat 8, thermostat 11 and valve 2, the compressor motor 10 and the solenoid valve 2 are activated.

The thermostat 8 does not function in control due to low setting temperatures; thermostat 11 takes control of the mode.

In this case, a smaller amount of refrigerant enters the evaporator 5, since the additional tube 3 has a greater resistance than the additional tube 6 (FIGS. 2 and 4c).

To obtain negative temperatures in all compartments of the refrigerator, turn the thermostat 11 clockwise, remove the tray in the positive compartment.

To get work only on the plus compartment, you need to switch the two-pin switch 9 (Fig.1 and 4B).

In order to remove the dependence of positive operation on the temperature of the freezer compartment, it is proposed that FIG. 3 using a two-sided (two-valve) solenoid valve 2 and a check valve 7 installed at the outlet of the evaporator 5 (FIG. 3).

Claims (2)

1. A household refrigerator unit that contains a condenser, a freezer compartment evaporator and a plus compartment evaporator and a suction pipe in series with the compressor motor refrigerant circuit, and the main capillary tube is designed for positive operation and the additional capillary tube in total is designed for low temperature mode, and the outputs of these evaporators are connected to the compressor motor, characterized in that it has a control system consisting of a thermostat and a switch connected to it, while the main capillary tube is connected to the positive compartment evaporator through a check valve that is installed at the outlet of the freezer compartment evaporator, and the input of the freezer compartment evaporator is connected to the outlet of the additional capillary tube. 2. The assembly according to claim 1, characterized in that between the main capillary tube and the check valve is connected to a second additional capillary tube.

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