KR20100060322A - Linear heat engine - Google Patents

Abstract

PURPOSE: A linear heat engine is provided to make structure simple by producing the power for cooling a high temperature heating part which supplies the outer heat source. CONSTITUTION: A linear heat engine comprises a cylinder(100), a high temperature heating part(300), and a low temperature refrigeration part(400) and piston(200). The actuator is accepted inside the cylinder. The high temperature heating part makes heat actuator expand by heating the front-end of cylinder. The low temperature refrigeration part contracts actuator by cooling the back-end of cylinder. The piston is accepted inside the cylinder in order to reciprocate by expansion and contraction of the actuator. The adiabatic section is formed between the high temperature heating part and low temperature refrigeration part of the cylinder.

Description

LINEAR HEAT ENGINE {LINEAR HEAT ENGINE}

The present invention relates to a heat engine, and more particularly to a linear heat engine that follows the intermediate form of an ideal heat cycle Carnot engine and a Stirling engine.

The Carnot engine is an ideal thermal efficiency engine with no heat loss, and practically all engines cannot exceed the thermal efficiency of the Carnot engine. Unlike general internal combustion engines, external combustion engines exhibit high thermal efficiency, among which a Stirling engine has a high thermal efficiency similar to that of the Carnot cycle and has low vibration and noise.

The Stirling engine is an external combustion engine that seals an operating gas such as hydrogen or helium in a space consisting of a cylinder and a piston and moves the piston up and down to obtain mechanical energy by heating and cooling the operating gas from the outside through heat exchange. It is a kind.

However, the stirling engine as described above has a problem that it is used only in a very limited field due to the difficulty of maintenance because the overall device is large and the structure is complex, the production cost is high and requires a high technical level.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a linear heat engine with high thermal efficiency while similarly following a heat cycle between a carno engine and a stirling engine.

Another object of the present invention is to provide a linear heat engine that is simple in structure and low in manufacturing cost and easy to maintain, unlike a conventional complex stirling engine.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

A linear heat engine according to an embodiment of the present invention for achieving the above object, a cylinder in which the working gas is accommodated, a high temperature heating unit for heating the front end of the cylinder to thermally expand the working gas, cooling the rear end of the cylinder And a low temperature cooling unit configured to reduce the pressure by contracting the working gas, and stored in the cylinder to linearly reciprocate by thermal expansion and contraction of the working gas, and the working gas is stored in the high temperature heating unit or the low temperature cooling unit. It may be configured to include a piston in which the opening and the heat insulation is formed to be in direct contact with the heat cycle.

In addition, the cylinder is preferably a heat insulating portion formed between the high temperature heating unit and the low temperature cooling unit.

In addition, the cylinder may have a cylinder head portion coupled to seal the front end portion of the cylinder by a fastening means.

In addition, it is preferable that the cylinder head portion guides the opening to be located at the high temperature heating portion when the actuator gas is fully contracted.

In addition, the cylinder head portion is provided with a protrusion formed on one surface facing the piston to provide a space spaced from the inner diameter of the cylinder to form a guide groove into which the front end portion of the piston is inserted.

In addition, the high temperature heating portion and the low temperature cooling portion is preferably provided in a ring shape on the outer peripheral surface of the cylinder.

Further, according to the first embodiment of the high temperature heating unit, it may include a combustion chamber disposed in the outer diameter of the front end portion of the cylinder, and a fuel supply unit for supplying fuel to the combustion chamber.

Further, according to the second embodiment of the high temperature heating unit, it may include a hot wire member wound around the outer diameter of the front end portion of the cylinder, and a power supply unit for supplying electricity to the hot wire member.

In addition, according to the third embodiment of the high temperature heating unit, a solar light collecting device including an optical module of a lens or concave mirrors for condensing sunlight, and the sunlight collected by the solar light collecting device directly heats the high temperature heating unit. Or an indirect heating device using a high temperature heating medium such as liquid sodium.

In addition, according to the first embodiment of the low temperature cooling unit, it may include a cooling fin formed in the outer diameter of the rear end of the cylinder, and a cooling fan for supplying air to the cooling fin to cool.

In addition, according to the second embodiment of the low temperature cooling unit, it may include a cooling tube wound on the outer diameter of the rear end of the cylinder, and a cooling pump for supplying cooling water to the cooling tube.

In addition, the piston has an open surface such that the protrusion of the cylinder head portion is inserted into the front end of the piston.

In addition, a plurality of the openings may be formed along the outer diameter behind the front end of the piston.

In addition, the front end portion of the piston is preferably formed of a heat insulating material.

In addition, it is preferable that at least one piston ring is provided at an outer diameter of the piston to seal between the cylinder and the piston.

In addition, the linear heat engine of the present invention may further include a restoring means for providing a restoring force to the piston so that the linear reciprocating vibration of the piston is continuously maintained. Here, the restoring means may include a coil spring, a leaf spring, a gas spring, or a magnet for generating a repulsive force interposed at the rear end of the piston.

A linear heat engine according to another embodiment of the present invention for achieving the above object is a cylinder in which an operating gas is accommodated, a high temperature heating unit for heating the front end of the cylinder to thermally expand the working gas, and cooling the rear end of the cylinder. And a low temperature cooling unit for reducing the pressure by contracting the working gas, and stored in the cylinder so as to linearly reciprocate by thermal expansion and contraction of the working gas, and the operating gas is directly in the high temperature heating unit or the low temperature cooling unit. It may be configured to include a piston in which the opening is formed to contact, and a power generation unit for converting the mechanical energy according to the linear reciprocating motion of the piston into electrical energy.

The power generation unit may include a stator including a vibrator including a magnet provided in the piston, and a coil configured to generate an induced electromotive force by vibrating the magnet in a linear reciprocating motion of the piston in the cylinder. Can be.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the linear heat engine of the present invention as described above has one or more of the following effects.

First, by following a new thermal cycle formed by heating and cooling in direct contact with external high temperature heating and low temperature cooling units, more specifically, the thermal cycle of the intermediate form between the Carnot engine and the Stirling engine, High thermal efficiency such as can be expected.

Second, it is possible to obtain the required power by only having a high temperature heating unit for supplying an external heat source and a low temperature cooling unit for cooling it without the need for complicated valves. That is, since the operating gas is in contact with the high and low temperature alternately in the opening of the piston by the reciprocating motion of the piston to complete the heat cycle, the structure is much simpler than the conventional stirling engine that must move to the high and low temperature parts. Easy to manufacture

Third, the air tight structure in which the free piston vibrates in the closed cylinder makes it easy to operate with a high-pressure gas, thereby obtaining a high output density per volume.

Fourth, unlike an internal combustion engine in which the lubricating oil in the cylinder is deteriorated because the external combustion engine uses an external heat source, the lubricating oil is almost permanent. In addition, since the lubrication zone is inside the cold zone, various lubricants can be used.

Fifth, since only linear motion due to the thermal expansion and contraction of the gas can be significantly reduced friction between the cylinder and the piston compared to the rotary engine.

Sixth, the vibration width and period can be adjusted by adjusting the weight of the piston, the elastic modulus of the spring, the gas pressure, the temperature of the high temperature / low temperature part.

Seventh, the gas filled in the spring portion of the lower end of the piston is compressed and expanded in the reciprocating direction of the piston to act as a gas spring by itself enables a more elastic vibration movement.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only the embodiments are to make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention belongs It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a linear heat engine according to exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

1 is a perspective view schematically showing a linear heat engine according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along line AA of Figure 1, Figure 3 is an exploded perspective view of the cylinder of the linear heat engine of the present invention, Figure 4 is a sectional view showing the configuration of the cylinder, FIG. 5 is an exploded perspective view of the piston in the linear heat engine of the present invention, and FIG. 6 is a sectional view showing the configuration of the piston.

1 to 6, the linear heat engine 10 according to an embodiment of the present invention includes a cylinder 100, a piston 200, a high temperature heating unit 300 and a low temperature cooling unit 400, and the like. Can be configured.

The cylinder 100 is formed in a cylindrical shape, and an operating gas such as hydrogen or helium is accommodated therein. In addition, the carbon black in the form of particulates is mixed in the working gas to increase the absorption power of the heat energy transferred from the high temperature heating unit 300 to be described later to increase the heat transfer effect on the working gas.

The cylinder 100 has fastening means such as bolts 125 and rivets so that the front end 111 of the cylinder body 110 is opened, and the open face 111a of the front end 111 of the cylinder body 110 is sealed. The cylinder head 120 is coupled by welding. Here, a plurality of bolt holes 122 are formed in the front end 111 of the cylinder body 110 for fastening and fixing the bolt 125.

The cylinder head part 120 may include a head cover 121 and a protrusion 123.

The head cover 121 is formed of a disc having a predetermined thickness and has a diameter equal to or larger than that of the front end 111 of the cylinder body 110, and has a bolt hole 112 of the front end 111 of the cylinder body 110. A plurality of bolt holes 122 are formed along the edges to correspond to the edges thereof, and are coupled to the front end 111 of the cylinder body 110 by the bolt 125 or the like. At this time, between the head cover 121 and the front end 111 of the cylinder body 110 is provided with a circular sealing member 130, for example, silicon packing to seal the operating gas inside the cylinder 100 to prevent leakage to the outside Can improve. The sealing member 130 has a circular hollow portion 130a formed at the center thereof so that the protrusion 123 of the cylinder head 120 can be inserted therein, and the bolt hole 132 can penetrate the bolt 125 at the edge thereof. ) May be formed.

The protrusion 123 protrudes in a cylindrical shape so as to face the piston 200 on one surface of the head cover 121 and is inserted into the open surface 111a of the front end 111 of the cylinder body 110. The protrusion 123 provides a space spaced apart from the inner diameter of the front end 111 of the cylinder body 110, preferably, a space G corresponding to the wall thickness of the front end 211 of the piston 200 to provide a piston. A guide groove 124 into which the front end portion 211 of the 200 is inserted is formed. At this time, the length of the protrusion 123, that is, the length of the guide groove 124 is located at the high temperature heating part 300 when the opening 212 of the piston 200 is at the minimum volume of the working gas, that is, when compressed by the maximum vibration. It is preferable that the length of the piston 200 be substantially the same as the length from the tip of the opening 212 to the tip.

The cylinder 100 has an opening surface 113a formed at the rear end 113 so that the piston 200 can be inserted into the cylinder 100.

The cylinder 100 may have a heat insulating part 140 to shield heat between the high temperature heating part 300 and the low temperature cooling part 400 which will be described later. For example, the cylinder body 110 is entirely made of stainless steel, and the heat insulating part 140 between the high temperature heating part 300 and the low temperature cooling part 400 is made of ceramic, silica ( silica) and the like.

The piston 200 is accommodated in the cylinder body 110 to linearly reciprocate by thermal expansion and contraction of the working gas sealed between the cylinder 100 and the piston 200. In the present exemplary embodiment, the configuration in which the free piston 200 is applied is illustrated, but is not limited thereto and may include various types of pistons.

The piston 200 is formed in a cylindrical shape in which the piston body 210 has a diameter corresponding to the inner diameter of the cylinder body 110, the front end portion 211 of the piston body 210 is a heat insulating material such as metal or ceramic having a low thermal conductivity It is preferably formed of vagina.

The piston 200 has an opening surface 211a formed so that the protrusion 123 of the cylinder head 120 is inserted into the front end portion 211 of the piston body 210, and from the rear portion of the opening 212 to be described later. It has a shape in which the inside is sealed. In addition, the piston 200 is preferably provided with a heat insulating member 219 in the rear portion of the opening (212).

The piston 200 has an opening 212 formed so that the working gas directly contacts the high temperature heating part 300 or the low temperature cooling part 400. Preferably, a plurality of openings 212 may be formed along the outer diameter of the front end portion 211 of the piston body 210. The opening 212 may be formed in various shapes such as a circle and a rectangle.

The front end 211 of the piston body 210 has a thickness corresponding to the gap G of the guide groove 124 formed between the inner wall of the cylinder body 110 and the protrusion 123 of the cylinder head 120. It is preferred to have t). In addition, the front end portion 211 of the piston body 210 is a length that blocks the operation gas in contact with the high-temperature heating unit 300 when the maximum expansion of the working gas, that is, when the vibration width of the piston 200 is the maximum. It is preferably formed. For example, in the present embodiment, when the lengths of the three regions of the high temperature heating part 300, the heat insulating part 140, and the low temperature cooling part 400 are the same, the cylinder head part 120 may have a length sufficient to cover the same. It is preferable that the protrusion 123 has a length substantially equal to the length of the guide groove 124.

The piston 200 may be provided with at least one piston ring 220 in the outer diameter of the rear end portion 213 of the piston body 210 so that the portion in contact with the inner wall of the cylinder body 110 is sealed. To this end, the outer diameter of the piston body 210 is preferably provided with at least one in the piston ring seating groove 215 that can be fixed by seating the piston ring 220. Since the piston ring 220 is located inside the low temperature cooling unit 400 of the cylinder 100 during the linear reciprocation of the piston 200, a material operating in a low temperature region such as a teflon ring may be used. In the present embodiment, but the configuration for applying the piston ring 220, but not limited to this, instead of the piston ring 220 may be arranged in the vertical bearing form a fixed ring on the inner wall of the cylinder body (110).

The high temperature heating unit 300 is a high temperature unit for thermally expanding the working gas by heating the front end 111 of the cylinder 100. The high temperature heating unit 300 is made of a metal material that is good heat transfer, may be provided in the ring shape on the outer peripheral surface of the cylinder 100, it is not limited to this can be selected in various embodiments.

The high temperature heating unit 300 may heat the front end 111 of the cylinder 100 by using thermal energy of combustion, heat transfer or sunlight.

For example, as illustrated in FIG. 7A, the high temperature heating unit 310 may heat the front end 111 of the cylinder 100 using thermal energy by combustion. To this end, the high temperature heating unit 310 is a combustion chamber 311 which is arranged in a ring shape on the outer diameter of the front end portion 111 of the cylinder body 110, and supplies the fuel to the combustion chamber 311 through the fuel pipe 313. The fuel supply unit 312 may be provided. In addition, a plurality of burners 311a may be disposed in the combustion chamber 311, and an air pipe 315 for injecting air into the combustion chamber 311 and an exhaust pipe 317 for discharging the combustion gas may be provided. have.

In addition, as shown in FIG. 7B, the high temperature heating unit 320 may heat the front end 111 of the cylinder 100 by using thermal energy by heat transfer. To this end, the high temperature heating unit 320 is arranged in a ring shape on the outer diameter of the front end portion 111 of the cylinder body 110, the heat transfer chamber 321 and a plurality of heating wire member 321a is wound therein, the heating wire member 321a ) May be provided with a power supply unit 322 for supplying electricity.

 In addition, as illustrated in FIG. 7C, the high temperature heating unit 330 may heat the front end 111 of the cylinder 100 by using thermal energy caused by solar light concentrated at a high density. To this end, the high temperature heating unit 330 is a front end of the cylinder 100 so that the solar light concentrating module 331 for condensing the sunlight and the sunlight condensed by the solar light concentrating module 331 is directly irradiated toward the working gas. The light transmission window 332 formed in the portion 111 may be provided. The solar light concentrating module 331 includes refractive type light condensing the sun by using a lens such as a magnifying glass to condense to one point, and reflection light condensing by condensing the light to one point by using a mirror of a curved surface. Compared to the condensing method, the reflective condensing method as shown in FIG. 7C can condense more dense solar light. The reflective condensing method can be configured in various ways depending on the number and shape of the reflection.

In this embodiment, the high-temperature heating unit 310, 320, 330 in the form of providing combustion, heat transfer or sunlight as a heat source, but not limited to this, it is possible to select a variety of embodiments. That is, the high temperature heating unit 300 may include all kinds of heat sources capable of maintaining a higher temperature than the surroundings, including the low temperature cooling unit 400.

The low temperature cooling unit 400 is a low temperature unit for contracting the working gas by cooling the rear end 113 of the cylinder 100. The low temperature cooling unit 400 may be provided in a ring shape on the outer circumferential surface of the cylinder body 110, but is not limited thereto and may be selected in various embodiments.

For example, as shown in FIG. 8A, the low temperature cooling unit 410 supplies air to the cooling fins 411 and the cooling fins 411 formed at the outer diameter of the rear end 113 of the cylinder 100. It may be configured in the form of air-cooled cooling, including the cooling fan 412 to cool. Here, the cooling fin 411 is preferably formed in the concave-convex shape in order to increase the area in contact with the atmosphere so that the cooling can be made more quickly under the atmosphere.

In addition, as shown in FIG. 8B, the low temperature cooling unit 420 is disposed in a ring shape at the outer end 1130 of the cylinder 100 and has a cooling chamber 421 having a plurality of cooling tubes 421a wound therein. It may be configured in the form of water-cooled cooling, including a cooling pump 422 for supplying cooling water to the cooling tube (421a).

9 is a perspective view schematically illustrating a linear heat engine according to another embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along line B-B of FIG. 9.

9 and 10, the linear heat engine 20 according to another embodiment of the present invention includes a cylinder 100, a piston 200, a high temperature heating part 300, a low temperature cooling part 400, and a power generation part. 500 and the like.

In another embodiment of the present invention, the present invention described with reference to FIGS. 1 to 8 except for a configuration further comprising a generator 500 for converting the mechanical energy according to the linear reciprocating motion of the piston 200 into electrical energy. Same as in one embodiment. Therefore, the same reference numerals are given to the same components as in the above embodiment, and detailed description thereof will be omitted.

The power generation unit 500 is a component that converts mechanical energy due to linear reciprocation of the piston 200 into electrical energy, and may include a magnet 510 and a coil 520.

The magnet 510 is provided in the piston 200, and preferably, a plurality of magnets 510 may be installed in the longitudinal direction in the magnet seating groove 217 formed in the outer circumferential surface of the front end portion 211 of the piston body 210.

The coil 520 is wound along the longitudinal direction on the outer diameter of the cylinder body 110 between the high temperature heating unit 300 and the low temperature cooling unit 400, the magnet 510 is a linear reciprocating motion of the piston 200 Vibration generates induction electromotive force.

The generator 500 vibrates the magnet 510 according to the linear reciprocating motion of the piston 200 to generate electricity from the coil 520. That is, the power generation unit 500 is integrated into the cylinder 100 and the piston 200 of the heat engine as a linear generator to convert mechanical energy into electrical energy. The electricity generated from the coil 520 by the vibration of the magnet 510 is an induction electromotive force, and when a magnetic field is generated around the coil 520 by the magnetic field around the coil 520, as if a current is generated, the movement of electrons Electron induction phenomenon occurs. The induced electromotive force generated from the coil 520 may be connected to a primary side of a transformer (not shown) composed of an LC resonance circuit, and AC electricity may be generated from the secondary side of the transformer.

11 is a schematic cross-sectional view of a linear heat engine according to another embodiment of the present invention.

As shown in FIG. 11, the linear hot air tube 30 according to another embodiment of the present invention includes a cylinder 100, a piston 200, a high temperature heating part 300, a low temperature cooling part 400, and a power generation part. 500 and the restoring means 600 may be configured.

In another embodiment of the present invention, the configuration that forms the same length of the heat insulating portion 140 of the cylinder 100, the opening 212 of the piston 200 and the high temperature heating portion 300, and the piston 200 It is the same as the above-described embodiments described with reference to FIGS. 1 to 10 except for a configuration in which a restoring means 600 is further provided at the rear end. Therefore, the same reference numerals are given to the same configuration as the above embodiments, and detailed description thereof will be omitted.

In the present embodiment, the heat insulating part 140 of the cylinder 100, the opening 212 of the piston 200, and the high temperature heating part 300 are formed to have the same length, thereby directly following the heat cycle as shown in FIG. 12. In heating and cooling, the working gas is efficiently thermally expanded or contracted to linearly reciprocate the piston 200. Here, the length of the low temperature cooling unit 400 is preferably formed to be equal to or slightly larger than the length of the heat insulating part 140, the opening 212, and the high temperature heating part 300.

In addition, the piston 200 needs a restoring force to recompress the expanded working gas in order to perform a continuous linear reciprocating vibration movement. Restoring means 600 is a coil spring, leaf spring or repulsive force interposed between the closed rear end of the cylinder 100 and the rear end of the piston 200 to provide a restoring force to the piston 200 when the working gas is expanded. It may include a magnet for generating a. Here, the rear end of the cylinder 100 including a spring (hereinafter, referred to as '600') serves as a gas spring for compressing and expanding the closed gas according to the vibration of the piston 200. .

12 and 13, the operation of the linear heat engine according to the present invention will be described in detail.

12A to 12D are exemplary views for sequentially explaining the operation of the linear heat engine according to the present invention, and FIG. 13 is a graph showing the thermodynamic cycle of the linear heat engine according to the present invention.

First, as shown in FIG. 12A, the piston 200 moves in a left direction so that the front end portion 211 of the piston 200 is formed between the inner wall of the cylinder 100 and the cylinder head portion 120 ( When inserted into the valve 124, that is, the piston moves until the working gas sealed in the space between the cylinder 100 and the piston 200 is in a minimum volume state, the opening 212 of the piston 200 moves to the cylinder 100. In the high temperature heating unit 300 of the). Here, when a current is applied to the coil of the power generation section, the piston starts to be started by the flaming left hand law according to the change of the magnetic force line of the magnet. The working gas is brought into high temperature heat compression state while absorbing thermal energy Q4 from the high temperature heating part 300 while directly contacting the high temperature heating part 300 through the opening 212 (4-> ① high temperature heat compression of FIG. 13A). process). This process is not the same as the heat cycle of the Carnot and Stirling engines, but is close to it. The heat transfer between the high temperature heating part 300 and the low temperature cooling part 400 is shielded by the heat insulating part 140 provided between the high temperature heating part 300 and the low temperature cooling part 400.

Next, as shown in FIG. 12B, while the heat energy Q1 is continuously absorbed from the high temperature heating part 300 to the working gas inside the cylinder 100, the molecules of the working gas become active in molecular motion and the movement speed thereof is increased. Will increase. The number of times the molecules of the working gas collide with the inner wall of the cylinder 100 is increased in response to the molecular motion, so that in the case of volume fixing it increases to the pressure in the volume. This pressure pushes the piston 200 installed inside the cylinder 100 downwards to perform high temperature thermal expansion (①-> ② high temperature thermal expansion process in FIG. 13A). This process is the same as the heat cycle of Carnot and Stirling engines.

Next, as shown in FIG. 12C, when the piston 200 moves to the right and the working gas reaches the maximum volume, the opening 212 of the piston 200 is positioned in the low temperature cooling part 400. The operating gas is in direct contact with the low temperature cooling unit 400 through the opening 212, and the pressure rapidly drops while expanding. At this time, since the temperature of the working gas is still higher than the low temperature cooling part, a part of the internal thermal energy Q2 is discharged outward (2 '-> 3 low temperature cooling expansion process of FIG. 13A). This process is not the same as the heat cycle of the Carnot and Stirling engines, but is close to it.

Next, as shown in FIG. 12D, the expanded working gas until the maximum volume is cooled and contracted while the high temperature heating unit 300 is blocked and only the low temperature cooling unit 400 comes into contact with the piston 200 to move upward. Will move. At this time, the heat energy (Q3) inside the working gas is discharged outward (3 ③-> ④ `low temperature cooling shrinkage expansion process of Figure 13a). This process is the same as the heat cycle of Carnot and Stirling engines.

If the axial length of the cylinder 100 including the thermal insulation portion 140 between the high temperature heating portion 300 and the low temperature cooling portion 400 is longer than the length of the opening 212 of the piston 200, the adiabatic is instantaneous. 13 (a) ②-> ②`, ④`-> ④ process of FIG. 13a, the overall heat cycle of ①-> ②-> ②`-> ③-> ④`-> ④-> ① of FIG. The cycle of the process is completed. If the axial length of the cylinder 100 including the thermal insulation portion 140 between the high temperature heating portion 300 and the low temperature cooling portion 400 is the same as the length of the thermal opening portion 212 of the piston 200, there is no thermal insulation section ( ② = ②`, ④ = ④`) Follow the ideal heat cycle as shown in Fig. 13B. If the axial length of the cylinder including the thermal insulation portion 140 between the high temperature heating portion 300 and the low temperature cooling portion 400 is shorter than the length of the opening portion 212 of the piston, the opening portion 212 is connected to the high temperature heating portion 300. Since the low temperature cooling unit 400 is brought into contact at the same time, the heating and cooling of the working gas occur at the same time, resulting in a similar effect to the adiabatic effect. The thermal cycle at this time is ①-> ②-> ② ' A cycle similar to the process of-> ④-> ① is completed (not shown).

As described above, the linear heat engine according to the present invention seals an operating gas such as hydrogen or helium in a space formed by the cylinder 100 and the piston 200, and heats and cools the same in an external process such as FIGS. 12A to 12D. While repeating this, the working gas is thermally expanded or contracted to linearly reciprocate the piston 200. In addition, the mechanical energy by the linear reciprocating motion of the piston 200 to produce electrical energy by the linear power generation unit (500). Based on this, the thermal efficiency of the linear heat engine according to the present invention is as shown in Equation 1 below.

As shown in Equation 1, the linear heat engine according to the present invention is an external combustion engine, and thus high thermal efficiency can be expected since it is almost similar to the intermediate form of an ideal heat cycle carnot engine and a stirling engine.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1 is a perspective view schematically showing a linear heat engine according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is an exploded perspective view of a cylinder in the linear heat engine of the present invention.

4 is a cross-sectional view showing the configuration of a cylinder.

5 is an exploded perspective view of a piston in the linear heat engine of the present invention.

6 is a cross-sectional view showing the configuration of a piston.

FIG. 7A is a perspective view illustrating main parts of a first embodiment of the high temperature heating unit in the linear heat engine according to the present invention. FIG.

FIG. 7B is a perspective view illustrating main parts of a second embodiment of the high temperature heating unit of the linear heat engine according to the present invention; FIG.

7C is a perspective view illustrating main parts of a third embodiment of the high temperature heating unit of the linear heat engine according to the present invention.

8A is a perspective view illustrating main parts of a first embodiment of the low temperature cooling unit in the linear heat engine according to the present invention.

8B is a perspective view illustrating main parts of a second embodiment of the low temperature cooling unit in the linear heat engine according to the present invention.

9 is a perspective view schematically showing a linear heat engine according to another embodiment of the present invention.

10 is a cross-sectional view taken along line B-B of FIG. 9.

11 is a schematic cross-sectional view of a linear heat engine according to another embodiment of the present invention.

12A to 12D are exemplary views for sequentially explaining the operation of the linear heat engine according to the present invention.

13A and 13B are graphs showing the thermodynamic cycle of a linear heat engine according to the invention.

<Description of Symbols for Main Parts of Drawings>

10,20,30: linear heat engine 100: cylinder

110: cylinder body 120: cylinder head portion

121: head cover 123: protrusion

124: guide groove 140: heat insulation

200: piston 210: piston body

212 opening 220 piston ring

300,310,320,330: High temperature heating part 400,410,420: Low temperature cooling part

500: power generation unit 510: magnet

520: coil 600: restoring means

Claims (18)

A cylinder in which the working gas is received; A high temperature heating unit for heating the front end of the cylinder to thermally expand the working gas; A low temperature cooling unit cooling the rear end of the cylinder to shrink the working gas; And And a piston housed in the cylinder to linearly reciprocate by thermal expansion and contraction of the working gas, the opening being formed so that the working gas directly contacts the high temperature heating part or the low temperature cooling part. The method of claim 1, The cylinder is a linear heat engine, characterized in that the heat insulating portion is formed between the high temperature heating portion and the low temperature cooling portion. The method of claim 1, And the cylinder has a cylinder head portion coupled to seal the front end portion of the cylinder by fastening means. The method of claim 3, wherein The cylinder head portion is a linear heat engine, characterized in that for guiding the opening is located in the high temperature heating portion when the maximum contraction of the working gas. The method of claim 4, wherein The cylinder head portion is a linear heat engine, characterized in that the protrusion is formed on one surface facing the piston to provide a space spaced from the inner diameter of the cylinder to form a guide groove into which the front end portion of the piston is inserted. The method of claim 1, The high temperature heating unit and the low temperature cooling unit is a linear heat engine, characterized in that provided in a ring shape on the outer peripheral surface of the cylinder. The method of claim 1, wherein the high temperature heating unit, A combustion chamber disposed at an outer diameter of the front end portion of the cylinder; And Linear heat engine comprising a fuel supply for supplying fuel to the combustion chamber. The method of claim 1, wherein the high temperature heating unit, A heating wire member wound around the outer diameter of the front end portion of the cylinder; And Linear heat engine comprising a power supply for supplying electricity to the heating element. The method of claim 1, wherein the high temperature heating unit, A solar light collecting module for condensing sunlight; And And a light transmission window formed at a front end portion of the cylinder such that sunlight collected by the solar light collecting module is irradiated toward the working gas. The method of claim 1, wherein the low temperature cooling unit, Cooling fins formed on the outer diameter of the rear end of the cylinder; And Linear heat engine comprising a cooling fan for supplying air to the cooling fins. The method of claim 1, wherein the low temperature cooling unit, A cooling tube wound around an outer diameter of the rear end of the cylinder; And Linear heat engine comprising a cooling pump for supplying cooling water to the cooling tube. The method of claim 5, The piston is a linear heat engine, characterized in that the opening surface is formed so that the protrusion of the cylinder head portion is inserted into the front end of the piston. The method of claim 1, The opening of the linear heat engine, characterized in that a plurality of the rear end of the piston is formed along the outer diameter. The method of claim 1, The front end of the piston is a linear heat engine, characterized in that formed of a heat insulating material. The method of claim 1, At least one piston ring is provided on the outer diameter of the piston to seal between the cylinder and the piston. The method of claim 1, And a restoring means for providing a restoring force to the piston such that the linear reciprocating vibration of the piston is continuously maintained. The method of claim 1, The linear heat engine further comprises a power generation unit for converting the mechanical energy according to the linear reciprocating motion of the piston into electrical energy. The method of claim 17, wherein the power generation unit, Magnets provided along the longitudinal direction in the outer diameter of the piston; And And a coil wound around the outer diameter of the cylinder along a length direction, the coil vibrating according to a linear reciprocating motion of the piston to generate an induced electromotive force.

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