CN201381910Y - Endothermic regenerative internal combustion engine - Google Patents

Abstract

Endothermic regenerative internal combustion engine. The utility model relates to a cooling energy recovery device for an internal combustion engine, in particular to an improved internal combustion engine device which utilizes waste heat recovery to perform expansion work, and belongs to the technical field of internal combustion engines. The gas cylinder liner of this device is in the coaxial high-pressure gas cylinder, and the coaxial compressed gas cylinder is reversely arranged under the gas cylinder, and the piston connecting rod of the compressed gas cylinder and the piston connecting rod of the gas cylinder liner are 180 degrees apart. °Together installed on the crankshaft, the piston and connecting rod of the gas cylinder liner are integrated with the piston and connecting rod of the high-pressure gas cylinder, and the exhaust port of the compressed gas cylinder is connected to the intake port of the high-pressure gas cylinder through a high-pressure gas storage pipe. The energy recuperation device can recover most of the remaining heat of the cylinder wall and gas through four strokes, and the thermal efficiency of the internal combustion engine can be increased by about 30%.

Description

Endothermic regenerative internal combustion engine

technical field

The utility model relates to a cooling energy recovery device of an internal combustion engine, in particular to an improved internal combustion engine device which utilizes waste heat recovery to perform expansion work, and belongs to the technical field of internal combustion engines.

Background technique

About 30% of the heat energy of the existing internal combustion engine is exhausted through the exhaust gas, and about 35% of the heat energy is taken away by the water in the cooling system. A total of about 70% of the heat energy cannot do work, so the conversion efficiency of heat energy is very low. At present, there are many studies on improving the heat energy conversion efficiency of internal combustion engines, but the known technologies are relatively complicated and costly. How to use these heat energy to do work simply and conveniently is an urgent problem to be solved.

Contents of the invention

The technical problem to be solved by the utility model is to provide a heat-absorbing energy recovery type internal combustion engine, which has a relatively simple structure and low manufacturing cost, can absorb the heat in the cylinder wall of the internal combustion engine and exhaust gas, and realize the purpose of energy saving. The thermal efficiency of the internal combustion engine can be greatly improved improve.

The solution adopted to solve the technical problems of the utility model is: the internal combustion engine is improved on the basis of the existing gas internal combustion engine, and the original single cylinder of the internal combustion engine is changed into an in-line three cylinder configuration, that is, the gas cylinder liner is coaxial In the high-pressure gas cylinder, the coaxial compressed gas cylinder is reversely arranged under the gas cylinder, and the piston connecting rod of the compressed gas cylinder and the piston connecting rod of the gas cylinder liner are installed on the crankshaft at an angle of 180° to each other. The piston and the connecting rod of the sleeve are integrated with the piston and the connecting rod of the high-pressure gas cylinder, and the exhaust port of the compressed gas cylinder is connected to the air inlet of the high-pressure gas cylinder through the high-pressure gas storage pipe.

Between the gas cylinder and the high-pressure gas cylinder, a spiral hot gas pipe is installed, which communicates with the exhaust port of the gas cylinder to become an exhaust pipe. The exhaust gas after combustion enters the spiral hot air pipe, passes through the cylinder wall of the high-pressure gas cylinder and discharges the hot gas to the atmosphere, so the high-pressure cold air can obtain heat energy from the cylinder wall of the gas cylinder and the combustion exhaust gas in the high-pressure gas cylinder, and the heat energy in the cylinder of the gas cylinder The gas works together.

Similar to the principle of the traditional cylinder, the high-pressure air cylinder of this device is also provided with a high-pressure intake valve at the air inlet, and an exhaust valve at the exhaust port; There is a one-way valve, and an intake check valve is arranged at the air inlet.

The above-mentioned high-pressure gas storage pipe of the utility model is connected by a series of parallel metal pipes, and the ratio of the total volume of compressed gas in the compressed gas cylinder to the total cavity volume of the high-pressure gas storage pipe is ≥4, that is, the air pressure ratio is above 4, so Appropriate heat recovery efficiency can be obtained.

The high-pressure air cylinder and the compressed air cylinder are connected by a body shell, and the body shell is provided with vent holes, which can make the structure of the device more compact, and can reduce the piston movement resistance of the high-pressure air cylinder and the compressed air cylinder. Small. The cylinder wall of the compressed air cylinder of the energy recovery device is equipped with a series of heat sinks, which can reduce the temperature of the high-pressure air produced by it as much as possible, thereby improving the working efficiency of the high-pressure air cylinder. The piston connecting rod of the gas cylinder liner and the piston connecting rod of the high-pressure gas cylinder adopt the same connecting rod, and the piston pin is hinged at the position where the gas working piston and the high-pressure gas working piston are connected, so that the structure of the device is compact and the force is better.

In order to increase the cooling effect of the high-pressure gas, the main shaft of the internal combustion engine in this scheme is connected to the fan drive installed at the position facing the high-pressure gas storage pipe.

The beneficial effect of the utility model is that the heat in the cylinder wall of the internal combustion engine and the exhaust gas is absorbed by using the high-pressure cold air to perform heat-absorbing expansion and work, so as to realize the purpose of energy saving. The thermal efficiency of the internal combustion engine can be greatly increased, while water cooling systems can be eliminated. reduce manufacturing cost.

Description of drawings

Fig. 1 is the structural representation that internal-combustion engine of the present invention moves to top dead center;

Fig. 2 is a schematic diagram of the working state of the internal combustion engine of the present invention;

Fig. 3 is a schematic diagram of the state of the internal combustion engine moving to the bottom dead center of the utility model.

The labels in Fig. 1 represent in turn: 1, air inlet, 2, air intake valve, 3, exhaust valve, 4, exhaust port, 5, exhaust pipe joint, 6, exhaust valve, 7, high-pressure gas storage pipe , 8, high-pressure intake valve, 9, high-pressure intake pipe, 10, spiral hot gas pipe, 11, gas acting piston, 12, piston pin, 13, hot gas exhaust port, 14, high-pressure gas acting piston, 15, acting piston connecting Rod, 16, body shell, 17, air vent, 18, crankshaft, 19, compressor piston connecting rod, 20, compressor piston, 21, cooling fin, 22, compressor piston pin, 23, compressor check valve, 24, high pressure inlet Trachea, 25, intake check valve, 26, high pressure gas cylinder, 27, gas cylinder, 28, compressed gas cylinder, 29, fan.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

This internal-combustion engine is improved on the basis of existing internal-combustion engines, and becomes three in-line cylinders by single gas cylinder 28 and constitutes, namely gas cylinder 27, high-pressure gas cylinder 26 and compressed gas cylinder 28. Through four strokes, most of the remaining heat of the cylinder wall and gas can be recovered.

1. Suction stroke: The gas working piston 11 moves downward, the intake valve 2 opens, and air is sucked in through the intake port 1. At the same time, the high-pressure gas working piston 14 connected to the gas working piston 11 also moves downward, the high-pressure intake valve 8 is opened, and the high-pressure air sucked into the high-pressure gas storage pipe 7, the high-pressure air absorbs the cylinder wall of the gas cylinder 27 and the combustion hot gas The heat of the exhaust pipe expands and does work, and promotes the high-pressure gas work piston 14 to move downward and do work. When the top two pistons are moving downward, they are transmitted by the piston connecting rod 15 and the crankshaft 18, and the compressor piston 20 moves upwards to enter the suction stage, the compressor check valve 23 is closed, and the intake check valve 25 is opened. Moving to the bottom dead center, the two intake valves are closed and the compression stroke begins.

2. Compression stroke: the gas working piston 11 moves upward, and the intake valve 2 and exhaust valve 3 are closed. At the same time, the high-pressure intake valve 8 is closed, the exhaust valve 6 is opened, and the high-pressure gas working piston 14 connected to the gas working piston 11 also moves upwards simultaneously, and the exhaust gas after the high-pressure air expands and works is discharged through the exhaust valve 6. When the two cylinders above move upwards, the compressed air piston 20 moves downward through the piston connecting rod 15 and enters the compressed air stage, the compressed air check valve 23 is opened, and the intake check valve 25 is closed. Air is pressed into the high-pressure air storage pipe 7 through the high-pressure air intake pipe 24 .

Here, the high-pressure gas storage pipe 7 is formed by connecting multiple metals in parallel, and its total cavity volume is v=nπr ² l, r is the radius of the inner wall of the high-pressure gas storage pipe cavity, and l is the total length of the high-pressure gas storage pipe; the total amount of compressed air V= πR ² L, where R is the radius of the compressor piston, and L is the stroke of the compressor piston. Therefore, the air pressure ratio is ε=V/v≥4, and the heat energy recovery efficiency is directly proportional to the air pressure ratio. Because the wall of the high-pressure gas storage pipe is thicker and the pressure resistance is strong, it can prevent air leakage; it is made of multiple metals connected in parallel, which can dissipate heat in time and dissipate the heat emitted by the compressed air in time to ensure that the temperature of the high-pressure gas is relatively high. Low, easy to absorb heat and expand to do work.

3. Power stroke: move to the top dead center, the two intake and exhaust valves are closed, the gas burns, and enters the power stroke. The gas working piston 11 moves downward, and the gas expands to perform work. At the same time, the high-pressure gas working piston 14 connected with the gas working piston 11 also moves downward, the high-pressure intake valve 8 is opened, and the high-pressure air is sucked in. The high-pressure gas working piston 14 moves downwards to do work, so that the top two pistons are all doing work. When the top two pistons are moving downward, the air-compressing piston 20 moves upwards through the piston connecting rod 15 and enters the suction stage, the air-compressing check valve 23 is closed, and the intake check valve is opened 25 . Moving to the bottom dead center, the two intake valves are closed and the exhaust stroke begins.

4. Exhaust stroke: the gas power piston 11 moves upward, the intake valve 2 closes, and the exhaust valve 3 opens. The hot gas after combustion enters the spiral hot gas storage pipe 10 through the exhaust port 4 through the exhaust pipe joint 5. At this time, the temperature of the gas is extremely high, which makes the temperature of the outer wall of the metal spiral hot gas storage pipe 10 extremely high, which is the next high-pressure The cold air expands to do work. At the same time, the high-pressure intake valve 8 is closed, the exhaust valve 6 is opened, and the high-pressure gas working piston 14 connected to the gas working piston 11 also moves upwards simultaneously, and the exhaust gas after the high-pressure air expands and works is discharged through the exhaust valve 6. When the two cylinders above moved upwards, the compressed air piston 20 moved downward through the piston connecting rod 15 and entered the compressed air stage, the compressed air check valve 23 was opened, and the intake check valve 25 was closed. Air is pressed into the high-pressure gas storage pipe 7 through the high-pressure intake pipe 24, and the high-pressure gas storage pipe is forcedly air-cooled by using the main shaft of the internal combustion engine to directly drive the fan 29.

The above is the process of four strokes. In this way, most of the remaining heat of the cylinder wall and gas can be recovered. Although the downward movement of the compressor piston 20 consumes energy, the heat generated by the compressed air should be dissipated as soon as possible. The heat sink 21 and the high-pressure gas storage pipe 7 are used to dissipate heat and the fan 29 is used to force the high-pressure gas storage pipe to be air-cooled to become high-pressure cold air. According to theoretical estimates, the energy recovered by the heat absorption and work of the high-pressure cold air is much higher than the energy consumed by the downward movement of the compressor piston 20, and the thermal efficiency of the internal combustion engine can be increased by 30%.

Claims (6)

1. A heat-absorbing energy-regenerating internal combustion engine, characterized in that: the gas cylinder liner is in the coaxial high-pressure gas cylinder, the coaxial compressed gas cylinder is reversely arranged below the gas cylinder, and the piston of the compressed gas cylinder is connected The rod and the piston and connecting rod of the gas cylinder liner are installed on the crankshaft at a 180° angle to each other. The piston and connecting rod of the gas cylinder liner are connected with the piston and connecting rod of the high-pressure gas cylinder. The air pipe is connected to the intake port of the high-pressure air cylinder. 2. The heat-absorbing energy recovery internal combustion engine according to claim 1, characterized in that: the exhaust port of the gas cylinder is connected to the spiral hot gas pipe installed between the gas cylinder and the high-pressure gas cylinder, and then connected to the high-pressure gas cylinder wall. The hot gas exhaust port is connected. 3. The heat-absorbing energy-regenerating internal combustion engine according to claim 1, characterized in that: a high-pressure intake valve is provided at the air inlet of the high-pressure gas cylinder, and an exhaust valve is provided at the exhaust port; There is a compression one-way valve at the exhaust port of the pump, and an air intake one-way valve at the air inlet. 4. The heat-absorbing energy-regenerating internal combustion engine according to claim 1, characterized in that: the high-pressure gas storage pipe is connected by a series of parallel metal pipes, and the total volume of compressed air in the compressed gas cylinder is equal to the total cavity of the high-pressure gas storage pipe. Volume ratio ≥ 4. 5. The heat-absorbing energy-regenerating internal combustion engine according to claim 2, 3 or 4, characterized in that: the body shell is connected between the high-pressure gas cylinder and the compressed gas cylinder, and a vent hole is arranged on the body shell; A series of cooling fins are installed on the cylinder wall of the cylinder; the piston connecting rod of the gas cylinder liner and the piston connecting rod of the high-pressure gas cylinder adopt the same connecting rod, and the piston pin is hinged at the position where the gas working piston and the high-pressure gas working piston are connected. 6. The heat-absorbing energy-regenerating internal combustion engine according to claim 5, characterized in that: the main shaft of the internal combustion engine is in drive connection with the fan installed at the position facing the high-pressure gas storage pipe.

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