RU40650U1 - DEVICE FOR COOLING THE INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

The utility model relates to the field of satisfying human needs and, in particular, to devices and systems for cooling an internal combustion engine, to devices and systems for reducing the level of thermal loads at various objects. The device contains a container with liquefied carbon dioxide, a pipeline for supplying carbon dioxide to the cooling point, an electrovalve at the junction of the container with the pipeline or on the pipeline. The electrovalve is electrically connected to the engine temperature sensor (coolant in the engine cooling system). The process of controlling the operation of the device is ensured automatically - switching on and off is carried out when the engine reaches threshold values.

Description

The utility model relates to the field of creating devices for cooling an internal combustion engine (ICE).

Known devices for cooling an internal combustion engine, for example, for VAZ-type cars [1, 2, 3, 4], containing coolant, a radiator connected by a pipe with an engine cooling jacket, a fan, a DC motor for driving a fan, temperature sensors - for displaying indications of heating of the cooling fluid (engine) on the instrument panel and for turning the fan on and off in the cooling system.

A significant drawback of existing ICE cooling systems and devices, in particular, in the prototype [1] is that their elements are designed for a control range from ~ 92 ° to 101 ° C and, when the temperature of the coolant is exceeded, the specified limit is inevitable engine warming with all the ensuing consequences.

In a whole series of cases, ICE cars find themselves in a situation where the cooling system does not provide cooling in the required temperature range. This can lead to a suboptimal mode of operation or even to overheating of the internal combustion engine and breakdowns - when driving in urban conditions (“in traffic jams”), in pits during mining, where there is practically no air movement, and also when working significantly above sea level, in case of failure of the electric motor, fan, temperature sensor.

In order to eliminate the shortcomings of the cooling systems, which are operated, including in the situations noted, a minor refinement of the cooling system is proposed.

The refinement consists in the fact that a container with liquefied carbon dioxide and nozzles connected with it by a piping, installed in front of the radiator from the driving side, are additionally introduced into the cooling system. In this case, the pipeline is equipped with an electrovalve with a temperature sensor in the engine cooling jacket.

The goal is achieved by the fact that when the temperature is exceeded above the permissible limit (we take 101 ° C) from the signal from the temperature sensor in the engine block, an additional device is included in the cooling process - the radiator is irrigated with liquefied carbon dioxide, ensuring a decrease in the temperature of the coolant to the standard level .

At the same time, it can be assumed that the temperature of the coolant (carrier) in all elements of the cooling circuit at steady state is equal and the readings of the sensors in the radiator and in the engine casing are the same with sufficient accuracy.

The authors chose liquefied carbon dioxide - СО ₂ as a coolant in an additional device, including because of its neutrality with respect to structural elements of a radiator, fan, rubber-technical products, and acceptable heat capacity (Ср = 0,85- 0.87 KJ / kg deg) and the evaporation temperature at the outlet of the nozzles С02 = -78.5 ° С at excess supply pressure.

To implement the proposed solution, an additional tank with liquefied carbon dioxide and nozzles hydraulically connected to it by the pipeline, installed in front of the radiator from the direction of the car’s movement, were additionally introduced.

The tank at the junction with the pipeline is equipped with an electrovalve, which, in principle, can be installed anywhere in the pipe-wire), electrically connected through an electronic unit with a temperature sensor in the engine cooling jacket.

The proposed device for additional cooling of the internal combustion engine is shown in Fig. 1 and 2 and consists of a tank 1 with liquefied carbon dioxide, an electrovalve 2, a pipeline 3 with several branches, nozzles 4 at the ends of the branches of the pipeline, an electronic unit 5, electrically connected to the temperature sensor 6 in the engine block (cooling jacket) and solenoid valve, tank clamp 7, pipe clamp 3

The activation circuit (electronic unit) of the temperature sensor (D) for actuating the electrovalve supply of liquefied carbon dioxide (or other cooler) can be made in the form of a circuit (Fig. 2): constant current amplifier (DCT) - potentiometer (I) - power amplifier (UM) - the electrovalve relay (P).

In this case, the opening of the contacts of the electrovalve is regulated to a temperature of 99 ± 2 ° C, and the short circuit to a temperature of 94 ± 2 ° C (or to other temperatures, depending on the problem statement).

The device operates as follows: when the temperature of the coolant is exceeded according to the testimony of the sensor 6, the signal after conversion in block 5, the electric signal enters relay 7, valve 2 opens, and liquefied carbon dioxide is sprayed through pipe 3 through nozzles 4 to the radiator.

Upon reaching the temperature of the permissible value, the system is returned to its initial state - the solenoid valve, according to the sensors, blocks the supply of liquefied carbon dioxide.

The proposed system was planned and tested on the internal combustion engine of the car, showed good results, but, in principle, the proposed solution can be used in other cases. For example, for stationary systems, when a regular cooling system is not enough, in the interests of reducing the level of radiation of objects in the interests of reducing the visibility of objects in the infrared wavelength range and in a number of other cases.

To implement the proposed solution in the internal combustion engine, evaluative calculations were performed. So for water as a coolant in the engine cooling system are accepted:

heat carrier mass (t) 10 kg;

heat capacity of water Srzh = 0.041 kgJ / kg K;

maximum permissible temperature of 101 ° C;

heat capacity of liquefied carbon dioxide (Cg) 0.86 kJ / kg deg;

the temperature of carbon dioxide evaporated at the outlet (at an excess supply pressure) of -78.5 ° C;

vehicle speed V = 0. When exposed to vapor of liquefied carbon dioxide, the temperature of the radiator (heat carrier weighing 10 kg) should be reduced by At2 = 5 ° C. In this case, the flow of liquefied carbon dioxide is estimated by the formula

*********

where *** = 101 ° - (- 78.5 °) = 179.5 ° C.

When the car moves at a speed of V = Vi, the coolant flow rate will decrease by an amount proportional to the heat removal Q ₁ from the radiator due to movement.

******** where a is the heat transfer coefficient calculated from the Reynolds number

(Re) proportional to speed **********

S is the surface of the radiator;

At is the temperature difference between the radiator and air flow.

The implementation of the utility model, as follows from the description and drawing of the device, can be carried out in the production of any dimension in the presence of metal, welding equipment, devices for sizing tanks and pipelines, nozzles on the branches of the pipeline can be performed in various forms, including simple refinement the final part of pipelines - for example, flattening while maintaining openings for the removal of carbon dioxide.

The electrical connection of the additional device to the existing circuit and the fastening of the elements of the device does not present technical problems.

The choice of the wall thickness of the tank and the pipeline is performed using known dependencies.

Literature

1. The device of cars of the VAZ 2110 series. Tolyatti, 2003.

2. The cooling system of the internal combustion engine. RF application for invention No. 2000129495/06, 7 F 01 P 7/16, 2000.

2. Japan Patent No. 63-80011, F 01 P 5/06, 1989.

3. Japan Patent No. 63-29085, F 01 P 5/06, 1988.

Claims (1)

A device for cooling an internal combustion engine, comprising a radiator communicated by pipelines with an engine cooling jacket, a fan, a direct current electric motor of a fan drive, a temperature sensor, characterized in that an additional container with liquefied carbon dioxide and nozzles hydraulically connected to it are installed, installed in front of the radiator, while the pipeline is equipped with an electrovalve electrically connected to the temperature sensor in the engine cooling jacket.