RU2326297C2 - Household refrigerator condenser - Google Patents

Abstract

FIELD: refrigeration industry.

SUBSTANCE: invention relates to refrigeration industry and consists in that the household refrigerator condenser incorporates a coolant coil and a vessel enveloping the coil to receive evaporating coolant. The coil together with the vessel make a pipe-in-pipe unified design with the inner pipe carrying the coolant and the outer one intended for cooler which is a low-boiling fluid. Note here, that the outer pipe is a natural cooling system evaporator, the system condenser being arranged in the open air and connected to the evaporator and vapour- and condensate piping.

EFFECT: increase in coolant refrigeration intensity, power saving, smaller overall dimensions and lower condenser noise.

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Description

The invention relates to the refrigeration industry, namely, condensers for domestic refrigerators.

Known condenser household refrigerator containing a tubular coil mounted on it with wire ribs that have protrusions in different planes [S.I. Kolokolov. Condenser home refrigerator. A.S. 1335787. Bull. No. 33, 1987]. Here, the refrigerant is cooled by free convection of air in the room, near the surface of the condenser.

A disadvantage of the known condenser is the low cooling rate due to the low air velocity at the surface of the condenser and its relatively high (room) temperature, which leads to prolonged operation of the refrigerator compressor and, as a result, to increased energy costs.

A known condenser of a domestic refrigerator containing a heat exchanger, which is a grounded electrode mounted on the wall of the refrigerator body, a high-voltage electrode located between the heat exchanger and the wall of the refrigerator body and a protective casing [B. S. Babkin, I. A. Rogov, M. R. Bovkun and V.D. Mikhailov. Air-cooled condenser. A.S. 1548625, Bull. No. 9, 1990]. Here, the refrigerant is cooled by free convection of air in the room, which is intensified by the ionization of air near the surface of the condenser, in order to create the so-called "electric wind".

The disadvantages of the known capacitor are:

- low cooling rate due to the low air velocity at the surface of the condenser even taking into account the "electric wind" and its relatively high (room) temperature, which leads to prolonged operation of the refrigerator compressor and, as a result, to increased energy costs;

- energy costs for the creation of "electric wind";

- increased safety requirements.

The closest to the claimed device in technical essence and the achieved result is a condenser of the refrigerating machine, including a developed heat transfer surface made of a finned coil, along which the refrigerant of the refrigerating machine moves, an electric fan assembly, a container around the coil for the evaporating cooler in the form of a capillary-porous structure covering the surface of the coil and having wick bends immersed in a tank of water [B.T. Marinyuk. Condenser of the chiller. Patent RU 2117885 C1, Bull. No. 23, 1998]. Here, the refrigerant is cooled by evaporation of water in a tank, which is intensified by blowing room surface air with an electric fan.

The disadvantages of the known capacitor are:

- increased energy consumption due to a sufficiently powerful electric fan,

- a lot of noise from a working fan;

- large dimensions of the entire installation for its use at home;

- insufficient cooling rate of the refrigerant due to the use of room air for blowing capacity.

The technical result of the claimed device is: increasing the cooling rate of the refrigerant, reducing energy consumption, reducing the size and eliminating noise.

To achieve a technical result, a device is proposed, which is a condenser of a domestic refrigerator, containing a coil for refrigerant of a household refrigerator and a container around it for an evaporative cooler made in the form of a pipe in pipe with an internal pipe for refrigerant and an external one for the cooler. The cooler is a boiling liquid, for example, Freon 22, and the outer pipe of the coil is an evaporator of the natural cooling system [G.M. Dolgikh and VB Gamarnik. The system of temperature stabilization of the foundation of structures on permafrost soils. A.S. 1426151, 1988], the condenser of which is located in the open air and connected to the evaporator by a steam and condensate line.

Distinctive features of the claimed device are:

- the fact that the coil, along with the tank around it, is made as a “pipe in pipe” type with an internal pipe for the refrigerant and an external pipe for the cooler;

- the fact that a coolant is used boiling liquid, for example, freon 22;

- the fact that the container around the coil is used as an evaporator of the free cooling system, the condenser of which is located in the open air and is connected to the evaporator by a steam and condensate line.

The listed distinguishing features ensure the achievement of the technical result indicated above - increasing the refrigerant cooling rate, reducing energy consumption, reducing dimensions and eliminating noise, namely: the free cooling system that cools the coil of a domestic refrigerator works only due to the temperature difference between the atmospheric air and the surface of the coil . It does not require energy, is silent and its dimensions inside the room are determined by the dimensions of the container around the coil. The latter are taken from the condition of equality of the bore between the two pipes of the pipe-in-pipe design to the section of the inner pipe. In addition, heat is removed from the domestic refrigerator directly into the atmosphere, the average annual temperature of which is much lower than room temperature, which leads to an increase in the cooling intensity and, consequently, to a reduction in the compressor operating time of the domestic refrigerator, and, consequently, to energy savings.

The inventive device is illustrated in the drawing.

The condenser of the household refrigerator in the form of a coil for the refrigerant has a container around it for the cooler, made in the form of a single tube-in-pipe design with the inner pipe 1 for the refrigerant of the household refrigerator and the outer pipe 2 for the cooler - low boiling liquid 3 (for example, freon 22 ), which is the evaporator of the free cooling system, the condenser of the free cooling system, consisting of a set of pipes 4 with an annular ribbing 5 and a surge vessel 6, steam pipe 7, condensate pipe 8 with hydraulic The shutter 9. When this steam pipe and the condensate pass through a building wall 10. A cooling system 2-9 low-boiling liquid is filled up to the bottom 3 forming the equalizing vessel 6.

The inventive device operates as follows.

When the compressor of the domestic refrigerator is operating, the inner pipe 1 heats up to the condensing temperature of the refrigerant and heats the cooler 3, which, when heated, evaporates and the steam formed in the pipe 2 displaces part of the cooler 3 into the equalization vessel 6. The presence of a hydraulic shutter 9 prevents the steam from moving through the condensate line 8 and determines its movement, as well as the movement of the vapor-liquid mixture in only one direction from the bottom of the equalization vessel 6 through the condensate pipe 8, the outer pipe 2 and the steam pipe 7 to the upper part of ur pressure vessel 6 and then into the pipe system 4, where it condenses to the atmospheric air, and condensate flows along the walls of pipes 4 into the equalization vessel 6, from which it again enters the system. The cycle is interrupted when the temperature of the air is higher than the temperature of the refrigerant in pipe 1 (when the compressor of the domestic refrigerator is turned off). As the cooler 3 moves along the pipe 2, it completely turns into steam. Thus, there are two flows in the pipe-in-pipe system: a condensing refrigerant stream moving through pipe 1 under the pressure developed by the compressor of a domestic refrigerator, and an evaporating cooler stream moving through pipe 2 under gravitational pressure, which ensures intensive heat exchange between the refrigerant household refrigerator and cooler 3. The gravitational pressure acting on the cooler 3 can be determined by the formula:

p = g · (ρ _x -ρ _p ) · H,

p is the gravitational pressure, Pa; g - acceleration of gravity, 9.81 m / s; ρ _w ; ρ _p - the density of the cooler 3, respectively, in the liquid and vapor state, kg / m ³ ; N is the vertical distance between the middle of the pipe 2 and the liquid level 3 in the surge vessel 6, m

The authors made comparative calculations of the intensity of heat dissipation by condensers of a conventional type household refrigerator and the claimed one. The calculation results indicate the high efficiency of the claimed device, which increases from south to north. So, for the Moscow region, the average annual heat removal intensity by the inventive condenser exceeds the intensity of heat removal by a commercial refrigerator condenser manufactured by the industry 2.4 times, the operating time of the compressor of the household refrigerator is reduced by the same amount and the cost of electricity is reduced.

Claims (1)

A condenser for a domestic refrigerator containing a coil for a refrigerant refrigerant and a container around a coil for an evaporating cooler, characterized in that the coil together with the tank represents a single pipe-in-pipe construction with an internal pipe for the refrigerant and an external one for the cooler, which is a low-boiling liquid, In this case, the outer pipe serves as an evaporator of the free cooling system, the condenser of which is located in the open air and is connected to the evaporator by a steam and condensate line.