WO2010143908A2

WO2010143908A2 - 2-stroke external combustion heat engine

Info

Publication number: WO2010143908A2
Application number: PCT/KR2010/003753
Authority: WO
Inventors: 김철수
Original assignee: Kim Cheolsoo
Priority date: 2009-06-10
Filing date: 2010-06-10
Publication date: 2010-12-16
Also published as: WO2010143908A3; KR20100132905A

Abstract

A 2-stroke external combustion heat engine according to the present invention comprises a cylinder head (1), a cylinder (2), a piston (3), a connecting rod (4), a crank shaft (5), a crank case (12) having an inner space to provide a plurality of components therein, an inlet valve (10) for selectively closing a cylinder intake manifold (8), an outlet valve (11) for selectively closing a cylinder exhaust manifold (9), a cam shaft driving gear (20) fixedly mounted at the crank shaft (5), a cam shaft driven gear (30) to be engaged with the cam shaft driving gear (20), a cam shaft (40) as the center of rotation of the cam shaft driven gear (30), inlet cam (41) and outlet cam (42) for respectively controlling the opening and closing of the inlet valve (10) and the outlet valve (11), inlet cam bar (43) and outlet cam bar (44) that freely move in a vertical direction in contact with the inlet cam (41) and the outlet cam (42), and inlet valve link structure (50) and outlet valve link structure (60) for making the inlet valve (10) and the outlet valve (11) in gear with the motions of the inlet cam bar (43) and the outlet cam bar (44), wherein the inlet valve (10) is configured to close the cylinder intake manifold (8) during the downward flow thereof and the outlet valve (11) is configured to close the cylinder exhaust manifold (9) during the upward flow thereof. The present invention has an advantage that the opening and closing of the inlet and outlet valves can be done smoothly even under the application of high pressure.

Description

2-stroke external combustion heat engine

The present invention relates to a two-stroke external combustion heat engine that obtains kinetic energy using an external pressurizing means and a heat medium pressurized and heated from a heat source. The present invention relates to reciprocating a piston in a cylinder using a working fluid pressurized and heated from the outside. And a camshaft interlocked with the crankshaft, an intake valve and an exhaust valve actuated by the intake cam and the exhaust cam disposed on the camshaft, while the intake valve has a valve seat from above. Downward closing method to close the cylinder inlet while lowering down, and exhaust valve has a closed structure to close the cylinder exhaust port as the valve seat is raised from the bottom up, thereby having a simple structure as a whole and more effective power It relates to a two-stroke external heat engine capable of obtaining.

In general, the engine (engin) is a device for generating power by converting thermal energy into mechanical work, an external combustion heat engine that is largely powered by a working fluid such as water or gas heated through the heat transfer surface of the boiler or heater, Fuels such as gasoline, diesel, and gas are combusted into internal combustion engines that burn inside the engine to convert thermal energy into mechanical energy.

In particular, the external combustion engine is roughly classified into a turbine type and a piston type, and such an external combustion engine generally makes a low temperature or high pressure working fluid by a compressor such as a pump or a compressor.

Then, it is heated again by a boiler or a heater to make a high temperature and high pressure state, and by using the working fluid of such high temperature and high pressure state, the turbine rotates in the engine or reciprocates the piston, and the working fluid exiting the engine is At mid-temperature and low-pressure state, it goes through a cooler, and then changes to low-temperature and low-pressure state.

Steam turbine, which is a representative example of a typical external combustion engine widely used in the past, obtains rotational energy by using a blade method. Therefore, it is not suitable for expensive, medium and small-sized engines because the conditions of steam must be well matched and precise blade processing is required.

On the other hand, the Stirling engine, which is widely known as a small-scale external combustion engine, has a power output per weight of about 1/10 of the existing internal combustion engine, and is not commercialized due to its complicated structure and high cost.

On the other hand, in the case of an internal combustion engine that mainly uses fossil fuel, there is an advantage that it is suitable for small scale and high thermal efficiency due to the small weight and volume, but there are limitations in the use of fuel and high pollution generation.

The two-stroke external combustion heat engine of the present invention has been devised in view of the above problems, and obtains power by reciprocating a piston in a cylinder by using a pressurized and heated working fluid from the outside, which is interlocked with the crankshaft. The intake valve and exhaust valve actuated by the camshaft, the intake cams and the exhaust cams installed on the camshaft are provided with the cylinder head part, and thus have the advantages of an external combustion engine and an internal combustion engine while having a relatively simple structure. The purpose is to provide a two-stroke external heat engine capable of obtaining effective power.

The two-stroke external combustion heat engine of the present invention includes a cylinder head (1), a cylinder (2), a piston (3), a connecting rod (4) and a crankshaft (5); A crankcase 12 having a space formed therein with a plurality of components therein; An intake valve (10) provided inside the cylinder head (1) to selectively close the cylinder intake port (8); An exhaust valve 11 provided inside the cylinder head 1 for selectively closing the cylinder exhaust port 9; A camshaft drive gear 20 fixedly mounted to the crankshaft 5; A camshaft driven gear (30) meshing with the camshaft driving gear (20); A cam shaft 40 serving as a rotation center of the cam shaft driven gear 30; An intake cam 41 and an exhaust cam 42 provided on the camshaft 40 to control opening and closing of the intake valve 10 and the exhaust valve 11, respectively; An intake cam rod 43 and an exhaust cam rod 44 which are installed over the cylinder head 1 and the crankcase 12 and are in contact with the intake cam 41 and the exhaust cam 42 and flow up and down; According to the movement of the intake cam rod 43 and the exhaust cam rod 44, the intake valve link body 50 and the exhaust valve link body 60 for interlocking the intake valve 10 and the exhaust valve 11 includes a To have a configuration; The intake valve 10 is configured to close the cylinder inlet 8 during downward flow, and the exhaust valve 11 is configured to close the cylinder exhaust port 9 during upward flow.

As described above, the two-stroke external combustion heat engine of the present invention has a simple structure and is capable of obtaining more effective power, and is particularly suitable for medium and small-scale power generation engines using clean energy such as solar heat. It also has the effect of coping with global warming and conserving the global environment.

In the present invention, the intake valve link member includes an intake valve driving link, an intake valve driven link, and the like connected by a link pin. Accordingly, the exhaust valve allows the cylinder exhaust port to be opened while the valve seat is lowered inside the cylinder, whereas the intake valve allows the cylinder intake port to be opened while the valve seat is raised outside the cylinder. According to the present invention, even if the pressure of the working fluid flowing into the cylinder through the main inlet is a high pressure has the advantage that the cylinder inlet is closed smoothly in the adiabatic expansion process or exhaust process.

1 is a perspective view showing the configuration of a preferred embodiment of a two-stroke external combustion heat engine according to the present invention.

FIG. 2 is a partially cutaway perspective view showing a cam shaft driven gear and a cam shaft driving gear removed from FIG. 1; FIG.

Figure 3 is a perspective view showing a detailed configuration of the intake valve linkage constituting an embodiment of the present invention.

4 is a perspective view showing a detailed configuration of an exhaust valve link member constituting an embodiment of the present invention.

Figure 5 is a perspective view showing a cylinder head top configuration constituting the embodiment of the present invention.

6 is a cross-sectional view taken along the line AA ′ of FIG. 5.

7 to 9 are cross-sectional views showing one state of an intake stroke, an adiabatic expansion step, and an exhaust stroke of a two-stroke external combustion heat engine according to a preferred embodiment of the present invention.

1: cylinder head 2: cylinder

3: piston 4: connecting rod

5: crankshaft 6: intake vent

7: Main exhaust vent 8: Cylinder intake

9: cylinder exhaust port 10: intake valve

11: exhaust valve 20: camshaft drive gear

30: Camshaft driven gear 40: Camshaft

41: intake cam 42: exhaust cam

43: intake cam rod 44: exhaust cam rod

50: intake valve link body 51: intake link body fixing bracket

52: intake valve driven link 53: intake valve driven link

54: link pin 55: elastic means

60: exhaust valve link member 61: exhaust link body fixing bracket

101: intake valve stem 102: intake valve seat

103: locking edge 104: intake ring portion

105: intake spring 111: exhaust valve stem

112: exhaust valve seat 113: exhaust end

114: exhaust spring 115: exhaust ring

302: piston sealing 304. piston sealing groove

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the two-stroke external combustion heat engine according to an embodiment of the present invention.

1 and 2 are shown in perspective view the main configuration of a preferred embodiment of a two-stroke external combustion heat engine according to the present invention. That is, Fig. 1 is a perspective view showing the main configuration of the embodiment of the present invention, Figure 2 is a partial cutaway perspective view of the opponent removed the camshaft driven gear and the camshaft driving gear constituting the embodiment of the present invention.

As shown in these figures, the two-stroke external-heat engine according to the present invention includes a cylinder head 1, a cylindrical cylinder 2 provided below the cylinder head 1, and a connecting rod 4. And a crank shaft 5, a cam shaft driving gear 20 fixedly mounted to the crank shaft 5, a cam shaft driven gear 30 meshing with the cam shaft driving gear 20, and the cam shaft driven gear. Cam shaft 40, which is the rotation center of the 30, the intake valve link body 50 and the exhaust valve link body 60 provided on the upper surface of the cylinder head 1, and a plurality of parts are provided therein. And a crankcase 12 having a space of a predetermined size, an intake cam rod 43, an exhaust cam rod 44, and the like installed over the cylinder head 1 and the crankcase 12.

The crankcase 12 has a rectangular box shape as shown, and the camshaft driving gear 20, the camshaft driven gear 30, and the like are provided in the crankcase 12.

The crankshaft 5 is installed across the front and rear of the crankcase 12, as shown. The crankshaft 5 is equipped with the camshaft drive gear 20.

On the upper right side of the crankshaft 5, the camshaft 40 is spaced apart in parallel with the crankshaft 5. The camshaft driven gear 30 is mounted on the camshaft 40.

The camshaft driving gear 20 and the camshaft driven gear 30 are provided to be engaged with each other, and preferably have the same size. That is, the cam shaft drive gear 20 and the cam shaft driven gear 30 are meshed with a gear ratio of 1: 1 and have the same diameter. Therefore, the cam shaft 40 is rotated once by one rotation of the crankshaft 5.

The camshaft 40 is provided with an intake cam 41 and an exhaust cam 42 for controlling the opening and closing of the intake valve 10 and the exhaust valve 11 to be described below. The intake cam 41 and the exhaust cam 42 are made of a cam, and are installed on the rear side of the camshaft driven gear 30 so as to be spaced a predetermined interval apart.

The lower ends of the intake cam rod 43 and the exhaust cam rod 44 are in contact with the outer surfaces of the intake cam 41 and the exhaust cam 42. Therefore, when the intake cam 41 and the exhaust cam 42 rotate the cam shaft 40 along the rotation of the cam shaft driven gear 30, the intake cam rod 43 and the exhaust cam rod 44 up and down Will be moved to.

The intake cam rod 43 and the exhaust cam rod 44, as shown in the form of a thin round rod is installed up and down, the lower end is in contact with the intake cam 41 and the exhaust cam 42.

Upper ends of the intake cam rod 43 and the exhaust cam rod 44 are in contact with the right ends of the intake valve link body 50 and the exhaust valve link body 60. That is, as shown, the upper end of the intake cam rod 43 and the exhaust cam rod 44 is exposed upward through the cylinder head 1, the intake valve link body 50 and the exhaust valve link body ( In contact with the bottom of 60).

The upper ends of the intake cam rods 43 and the exhaust cam rods 44 are in contact with ball contact holes 522 and 622 respectively formed in the intake valve driving link 52 and the exhaust valve driving link 62 to be described below. It is formed to have a diameter slightly larger than the diameter of each of the coalescing holes (522,622). In addition, the upper end of the intake cam rod 43 and the exhaust cam rod 44 is preferably made of a hemisphere.

As shown in the drawing, the intake valve link member 50 and the exhaust valve link member 60 are provided on the upper surface of the cylinder head 1 to serve as a link for transmitting power. That is, the movement of the intake cam rod 43 and the exhaust cam rod 44 which flows up and down by the intake cam 41 and the exhaust cam 42 to the intake valve 10 and the exhaust valve 11 to be described below. By transmitting and closing the intake valve 10 and the exhaust valve 11 is made.

On the front surface of the cylinder head 1, a main exhaust port 7 is further formed. That is, as shown, a circular main exhaust pipe 7 is formed in the front center portion of the cylinder head 1 to guide the discharge of the exhaust gas.

In addition, the back of the cylinder head 1, the main air inlet 6 to be described below is formed. In the main inlet 6, a main inlet 6 formed on the rear surface of the cylinder head 1 is formed to be symmetrical with the main exhaust port 7 to guide the intake of air.

In addition, a heat generating means 121 for heating the inside of the crankcase 12 is optionally further provided in the inner empty space portion of the crankcase 12. That is, '⊃' shaped heat generating means 121 is further formed on the inner left surface of the crankcase 12.

The heat generating means 121, in particular for the case of using steam as the working fluid, such a heat generating means 121 is sufficient if it is a configuration capable of heating the inside of the crankcase 12 is limited in particular in its shape or configuration Do not put For example, as shown in the figure, in addition to the U-shaped tube through which the high temperature steam passes, it may also be an electric heater provided with a heating coil.

3 and 4, the configuration of the intake valve link body 50 and the exhaust valve link body 60 is shown in detail. That is, the configuration of the intake valve link body 50 is shown in perspective view in FIG. 3, and the configuration of the exhaust valve link body 60 is shown in perspective view in FIG. 4.

As shown in these figures, the intake valve link member 50 has an intake link body fixing bracket 51 fixed to the upper surface of the cylinder head 1, and an upper end portion of the intake cam rod 43 on the bottom right side thereof. An intake valve driving link 52 elastically contacted, an intake valve driven link 53 on which the upper end of the intake valve 10 is described on the left bottom surface, and the intake valve driving link 52 and the intake valve driven An upward elastic force is applied to a link pin 54 interconnecting the link 53 and a connection portion between the intake valve driving link 52 and the intake valve driven link 53 connected by the link pin 54. It is composed of an elastic means 55 and the like.

The intake link body fixing bracket 51, as shown, is formed to have a cross-sectional shape of the '경우' shape (when viewed from the left and right).

In addition, fixing

pins

521 and 523 serving as rotation centers of the intake valve driving link 52 and the intake valve driven link 53 are respectively installed across the front and rear ends of the intake link body fixing bracket 51. do. That is, the intake valve driving link 52 and the intake valve driven link 53 have a cross section of a '∪' shape (when viewed from the left and right) corresponding to the intake link body fixing bracket 51, and the fixing pin. (521, 523) is installed inside the intake link body fixing bracket (51) to be rotatable about an axis.

The upper end of the intake cam rod 43 is in contact with the right end of the intake valve driving link 52. Accordingly, the right end of the intake valve driving link 52 is formed so that a circular ball contact hole 522 is guided so that the upper end portion of the intake cam rod 43 elastically contacts.

In the left part of the intake valve driven link 53, a locking hole 531 through which the upper end of the intake valve stem 101 of the intake valve 10 to be described below is fitted is formed through.

As shown in the drawing, the left end of the intake valve driving link 52 and the right end of the intake valve driven link 53 are connected to each other by the link pin 54 to be interlocked with each other.

The elastic means 55 serves to exert an upward elastic force on the connection portion between the intake valve driving link 52 and the intake valve driven link 53. That is, when no external force acts, the force is forced to rise above the intake valve driving link 52 and the intake valve driven link 53. Therefore, the right end of the intake valve driving link 52 and the left end of the intake valve driven link 53 are lowered relatively.

The elastic means 55 is not limited to its configuration and form as long as it has a function of exerting upward force on the connection portion between the intake valve driving link 52 and the intake valve driven link 53, but FIG. In view of the convenience of description and the simplification of the structure, a torsion spring in which a central coil part is wound on the outer side of the link pin 54 and both ends are supported by the fixing

pins

521 and 523 is illustrated.

The exhaust valve link member 60 includes an exhaust link fixing bracket 61 fixed to an upper surface of the cylinder head 1, and an exhaust valve link 62 rotatably provided inside the exhaust link fixing bracket 61. ) And the like.

The exhaust link fixing bracket 61, like the intake link body fixing bracket 51, is formed to have a cross section of a '∪' shape (when viewed from the left and right sides), and in the center portion of the exhaust valve link 62. A fixing pin 621 serving as a rotation center is provided to cross back and forth.

The exhaust valve link 62, as shown, is formed to have a predetermined length from side to side, and is rotatably installed around the fixing pin 621. In addition, the right end of the exhaust valve link 62 is in elastic contact with the upper end of the valve stem 111 of the exhaust valve 11 to be described below, and the left end of the exhaust valve rod 44 is in elastic contact with the upper end of the exhaust cam rod 44. Done. Therefore, a circular contact hole 622 is formed at the left end of the exhaust valve link 62 to guide the upper end of the exhaust cam rod 44 up and down.

The diameters of the intake cam rod 43 and the exhaust cam rod 44 in contact with the contact holes 522 and 622 are respectively formed in the intake valve driving link 52 and the exhaust valve link 62, respectively. A little larger than the diameter of), the upper end portions of the intake cam rod 43 and the exhaust cam rod 44 is preferably in a hemispherical shape.

This is because the intake valve driving link 52 and the exhaust valve link 62 are pivoted about the fixing pins 521 and 621, respectively, while the intake cam rod 43 and the exhaust cam rod 44 are vertical. In order to easily transfer the lift force of the intake cam rod 43 and the exhaust cam rod 44 to the intake valve driving link 52 and the exhaust valve link 62, respectively, since the vertical movement is performed.

5 and 6 show the configuration of the cylinder head 1 in detail. That is, FIG. 5 is a top perspective view showing the configuration of the cylinder head 1, and FIG. 6 is a cross-sectional view taken along the line A-A 'of FIG.

As shown in these figures, the cylinder head 1 has a rectangular box shape, and the cylinder 2 is provided below the cylinder head 1. In addition, a piston 3 is provided inside the cylinder 2 and flows up and down.

On the right side (in FIG. 6) of the cylinder head 1, the main exhaust pipe 7 described above is formed, and on the left side (in FIG. 6) a main inlet 6 is formed to guide suction.

In addition, a cylinder intake port 8 and a cylinder exhaust port 9 communicating with the inside of the cylinder 2 are formed at the bottom of the cylinder head 1, respectively. The cylinder intake port 8 is in communication with the main intake port 6, and the cylinder exhaust port 9 is in communication with the main exhaust port 7.

The cylinder intake port 8 is opened and closed by an intake valve 10. The intake valve 10 is formed in a downwardly closed manner configured to close the cylinder inlet 8 while descending downward.

Looking in more detail, the intake valve 10, the intake valve stem 101 having a predetermined length up and down and the intake valve formed in the lower end of the intake valve stem 101 to selectively shield the cylinder intake port (8) And a valve seat 102, a locking end 103 formed above the intake valve stem 101, and an intake spring 105 provided on one side of the locking end 103 to generate an elastic force. .

The intake valve seat 102 is formed to have a diameter larger than the diameter of the intake valve stem 101, and is formed to have a diameter larger than the lower diameter of the lower end of the cylinder intake port 8. Selectively close 8).

The locking end 103 is formed at a position spaced a predetermined distance above the intake valve stem 101. Therefore, the intake ring 104 having the intake spring 105 is formed between the locking end 103 and the intake valve stem 101. The locking end 103 is a portion exposed through the locking hole 531 of the intake link body fixing bracket 51 to the upper side.

The intake ring 104 is formed to have a diameter smaller than that of the intake valve stem 101, and the intake ring 105 is wound around the intake ring 104 to form a compressive force.

The intake spring 105 is made of a compression spring, the upper end is in contact with the bottom surface of the intake valve driven link 53, the lower end is in contact with the upper end of the intake valve stem 101. Therefore, the intake spring 105 pushes the intake valve 10 down with a predetermined elastic force.

The cylinder exhaust port 9 is opened and closed by an exhaust valve 11. The exhaust valve 11 is formed in an upward closure method configured to close the cylinder exhaust port 9 while rising upward.

Looking in more detail, the exhaust valve 11, the upper end is in contact with the exhaust valve link body 60, the lower end is installed to selectively contact the lower end of the cylinder exhaust port (9). Thus, the exhaust valve 11 is raised to close the cylinder exhaust port (9).

The exhaust valve 11 may include an exhaust valve stem 111 that is formed to be vertically long and an exhaust valve seat 112 that is formed at a lower end of the exhaust valve stem 111 to selectively shield the cylinder exhaust port 9. And an exhaust end 113 formed on the exhaust valve stem 111 and an exhaust spring 114 provided on one side of the exhaust end 113 to generate an elastic force.

The exhaust valve seat 112 is formed to have a diameter larger than the diameter of the exhaust valve stem 111, and is formed to have a diameter larger than the upper diameter of the upper end of the cylinder exhaust port 9. 9) is optionally closed.

The exhaust stage 113 is formed at a position spaced a predetermined distance above the exhaust valve stem 111. Accordingly, an exhaust ring 115 having a diameter smaller than these is formed between the exhaust end 113 and the exhaust valve stem 111.

The exhaust ring 115 is provided with a ring-shaped support ring 116. The support ring 116 is an annular ring, which is fitted to the exhaust ring 115 to support an upper end of the exhaust spring 114.

The exhaust spring 114 is made of a compression spring, the upper end is in contact with the bottom surface of the support ring 116, the lower end is in contact with the upper surface of the cylinder head (1). Accordingly, the exhaust spring 114 pushes the exhaust valve 11 upward with a predetermined elastic force.

On the other hand, the piston 3 is further provided with a piston sealing 302. That is, a piston sealing groove 304 of a predetermined size is formed in the lower rim of the piston 3 to be recessed inward, and the piston sealing groove 304 seals a gap between the piston 3 and the cylinder 2. The piston seal 302 of an elastic material for insertion is installed.

As such, the piston seal 302 is provided on the outer surface of the piston 3 such that a working fluid such as steam contributing to the pressurization of the piston 3 is located at the bottom of the piston 3. This is to prevent leakage inside. That is, the piston seal 302 of the elastic material is to prevent the steam flowing into the crankcase 12 through the gap between the piston 3 and the cylinder (2).

As described above, the two-stroke external combustion heat engine of the present invention uses various kinds of materials as a working fluid that is introduced into the cylinder 2 to reciprocate the piston 3. That is, high pressure steam, inert gas such as helium, argon or air may be used.

Although not shown, a compressor such as a pump or a compressor is used for pressurizing the working fluid, and a heater having a heat transfer surface such as a solar heat collector or a boiler is used for the heating. At this time, the driving of the compressor uses the power generated from the two-stroke external combustion heat engine of the present invention.

In the two-stroke external combustion heat engine of the present invention, the camshaft driving gear 20 and the camshaft driven gear 30 are meshed at a gear ratio of 1: 1 so that the camshaft 40 rotates once when the crankshaft 5 rotates. Theoretically, when the top dead center of the piston 3 is 0 ° based on the rotation angle of the crankshaft 5, the intake stroke in which the working fluid flows into the cylinder 2 is made in the range of 0 to 20 °, and 20 to 20 The adiabatic expansion of the working fluid introduced in the 180 ° range is made, the exhaust stroke is made in the 180 ~ 360 ° range.

However, in consideration of the inertia, the opening of the cylinder intake port 8 by the intake valve 10 is started at a rotation angle of -20 ° (or 340 °) of the crankshaft 5 and the rotation angle of the crankshaft 5 160 °. A fixed position of the intake cam 41 and the exhaust cam 42 to the camshaft 40 or the camshaft drive gear 20 such that the opening of the cylinder exhaust port 9 by the exhaust valve 11 starts at a point. And the first engagement position of the camshaft driven gear 30.

Here, the intake valve link body 50 is composed of an intake valve driving link 52 and an intake valve driven link 53 connected to the link pin 54, unlike the exhaust valve link body 60, of the present invention In the two-stroke external combustion heat engine, the exhaust valve 11 opens the cylinder exhaust port 9 while the valve seat 112 descends inside the cylinder 2, but the intake valve 10 is reversely opposed to the intake valve seat ( It is for allowing the cylinder intake port 8 to open while 102 is raised outside the cylinder 2.

Since the pressure of the working fluid flowing into the cylinder 2 through the main inlet 6 communicated with the cylinder inlet 8 is high, the intake valve 10 is replaced with the intake valve 10 and the exhaust valve 11. If the intake valve seat 102 has a structure that opens the cylinder intake port 8 while descending from the inside of the cylinder 2, as is commonly taken in a general heat engine equipped with, the cylinder intake port 8 in the adiabatic expansion process or exhaust process ) Is not closed properly.

7 to 9 are cross-sectional views showing each state of an intake stroke, an adiabatic expansion step, and an exhaust stroke of a two-stroke external combustion heat engine according to a preferred embodiment of the present invention. That is, FIG. 7 illustrates a stage in which the intake valve 10 is opened and the exhaust valve 11 is closed to allow intake of working fluid into the cylinder 2, and FIG. 8 is a time point at which intake ends, or just before exhaust starts. Both the intake valve 10 and the exhaust valve 11 are closed so that the high-temperature, high-pressure working fluid introduced into the cylinder 2 is adiabaticly expanded, and FIG. 9 shows that the intake valve 10 is exhausted in a closed state. The valve 11 is opened to show the exhaust stage in which the working fluid inside the cylinder 2 is discharged through the cylinder exhaust port 9.

First, the intake cam 41 mounted to the cam shaft 40 is rotated by the cam shaft 40 interlocked with the crank shaft 5 by the cam shaft driving gear 20 and the cam shaft driven gear 30. The exhaust cam 42 is rotated.

As the intake cam 41 and the exhaust cam 42 rotate, the intake cam rod 43 and the exhaust cam rod 44 sequentially rise and fall, and the rise of the intake cam rod 43 First, the lifting force of the intake cam rod 43 exceeds the elastic force of the elastic means 55 to push up the bottom surface of one side of the intake valve driving link 52 in contact with the upper end of the intake cam rod 43. do.

In this case, since the intake valve driving link 52 pivots using the fixing pin 521 as the rotation axis, the other side of the intake valve driving link 52 is lowered, and thus the locking hole 531 is disposed at one bottom surface. The other side of the intake valve driven link 53, which is formed and connected to the other side of the intake valve driving link 52 by the link pin 54, is lowered together, and the intake valve driven link 53 is also fixed. Since the pin 523 rotates with the rotation axis, the opposite side is raised.

At this time, since the upper end of the intake valve stem 101 of the intake valve 10 is locked to the locking hole 531, the entire intake valve 10 is raised while the intake valve seat 102 is the cylinder intake port ( 8) is opened, whereby an intake stroke in which a high-temperature, high-pressure working fluid flows into the cylinder 2 through the cylinder intake 8 begins.

Next, the lowering of the intake cam rod 43 proceeds by the continuous rotation of the intake cam 41, in which case the link pin 54 of the intake valve driven link 53 by the elastic force of the elastic means (55). ) The connection part is raised, and thus the opposite side of the connection part of the link pin 54 receives the descending force.

At this time, since the upward elastic force of the intake spring 105 is blocked by the elastic force of the elastic means 55, the downward elastic force of the intake spring 105 is the intake valve stem 101 of the intake valve 10 The entire intake valve 10 is lowered by acting on the upper portion, and the intake valve seat 102 closes the cylinder intake port 8, thereby completing the intake stroke.

Therefore, the elastic force of the elastic means 55 should be greater than the elastic force of the intake spring 105. As shown in FIG. 7, the exhaust valve 11 is closed in this intake stroke step.

After the intake stroke is completed, as shown in FIG. 8, the intake valve 10 and the exhaust valve 11 until the crankshaft 5 rotation angle 180 °, that is, the piston 3 reaches the bottom dead center position. The adiabatic expansion step is performed in which the working fluid introduced into the cylinder 2 expands in the closed state.

Subsequently, the exhaust cam rod 44 is raised by the rotation of the exhaust cam 42. The upper end of the exhaust cam rod 44 pushes up one side of the exhaust valve link 62 which is in contact with the exhaust cam rod 44. Since the link 62 pivots using the fixing pin 621 as the rotating shaft, the other side of which the bottom surface is in contact with the upper end of the valve stem 111 of the exhaust valve 11 is lowered.

Accordingly, the entire exhaust valve 11 is lowered so that the cylinder exhaust port 9 is opened, and the piston 3 is pushed by the adiabatic expansion in the cylinder 2 through the open cylinder exhaust port 9. By performing the internal work, the exhaust stroke of the working fluid in the medium temperature and the low pressure is discharged through the cylinder exhaust port 9 is started.

When the exhaust cam rod 44 is lowered by the continuous rotation of the exhaust cam 42, the lower end of the exhaust spring 115 is supported on the upper surface of the cylinder head 1, the elastic force acts upward, and the ring One side of the exhaust valve link 62 which is in contact with the upper end of the valve stem 111 of the exhaust valve 11 is raised through the support ring 116 having a shape.

Therefore, the cylinder exhaust port 9 is closed, and at the same time when the closing of the cylinder exhaust port 9 ends, the crankshaft 5 finishes one rotation, thereby providing two strokes of the two-stroke external combustion heat engine of the present invention. One cycle is completed. As shown in FIG. 9, the intake valve 10 is closed in this exhaust stroke stage.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the above technical scope.

For example, a sealing member may be provided in each of the valve seats 102 and 112, or the locking hole may be easily inserted into the locking hole 531 of the intake valve stem 101 of the intake valve 10. Of course, it is also possible to change the shape of 531.

The two-stroke external combustion heat engine of the present invention exhibited excellent performance as the present inventors actually manufactured and performed, and is particularly suitable for medium and small-scale power generation engines using clean energy such as solar heat for heating the working fluid.

That is, the two-stroke external combustion heat engine according to the present invention can be variously used for an apparatus for generating power by converting thermal energy into mechanical work.

Claims

A cylinder head 1, a cylinder 2, a piston 3, a connecting rod 4 and a crankshaft 5;

A crankcase 12 having a space provided therein with a plurality of components therein;

An intake valve (10) provided inside the cylinder head (1) to selectively close the cylinder intake port (8);

An exhaust valve 11 provided inside the cylinder head 1 for selectively closing the cylinder exhaust port 9;

A camshaft drive gear 20 fixedly mounted to the crankshaft 5;

A camshaft driven gear (30) meshing with the camshaft driving gear (20);

A cam shaft 40 serving as a rotation center of the cam shaft driven gear 30;

An intake cam 41 and an exhaust cam 42 provided on the camshaft 40 to control opening and closing of the intake valve 10 and the exhaust valve 11, respectively;

An intake cam rod 43 and an exhaust cam rod 44 which are installed over the cylinder head 1 and the crankcase 12 and are in contact with the intake cam 41 and the exhaust cam 42 and flow up and down;

According to the movement of the intake cam rod 43 and the exhaust cam rod 44, the intake valve link body 50 and the exhaust valve link body 60 for interlocking the intake valve 10 and the exhaust valve 11 includes a To have a configuration;

The intake valve 10 is configured to close the cylinder inlet 8 during downward flow, and the exhaust valve 11 is configured to close the cylinder exhaust port 9 during upward flow. .
According to claim 1, wherein the intake valve link member 50,

An intake link body fixing bracket (51) fixed to an upper surface of the cylinder head (1);

An intake valve driving link 52 provided at one side of the intake link body fixing bracket 51 and having an upper end portion of the intake cam rod 43 elastically contacted at one side thereof;

An intake valve driven link 53 provided at one side of the intake link body fixing bracket 51 and having an upper end of the intake valve 10 at one side thereof;

A link pin 54 provided at one side of the intake link body fixing bracket 51 and interconnecting the intake valve driving link 52 and the intake valve driven link 53;

It is provided on one side of the link pin 54, the elastic means 55 for applying an elastic force in one direction to the connection portion of the intake valve driving link 52 and the intake valve driven link 53; 2-stroke external combustion heat engine.
The method of claim 1, wherein the exhaust valve link body 60,

An exhaust link fixing bracket (61) fixed to the upper surface of the cylinder head (1), and an exhaust valve link (62) rotatably installed inside the exhaust link fixing bracket (61);

At the center of the exhaust link fixing bracket (61), a fixing pin (621) serving as a rotation center of the exhaust valve link (62) is provided across;

The exhaust valve link 62,

One end is in contact with one end of the exhaust valve (11), the other end of the two-stroke external combustion heat engine, characterized in that the upper end of the exhaust cam rod (44) contact.
The method of claim 1, wherein the intake valve 10,

An intake valve stem 101 having a predetermined length up and down, an intake valve seat 102 formed at a lower end of the intake valve stem 101 to selectively shield the cylinder intake port 8, and the intake valve stem 101 And an intake spring (105) provided at one side of the locking end (103) and generating an elastic force.
The method of claim 1, wherein the exhaust valve 11,

An exhaust valve stem 111 formed vertically long, an exhaust valve seat 112 formed at a lower end of the exhaust valve stem 111 to selectively shield the cylinder exhaust port 9, and the exhaust valve stem 111 A two-stroke external combustion heat engine comprising: an exhaust stage (113) formed at an upper side of the exhaust stage and an exhaust spring (114) provided at one side of the exhaust stage (113) to generate an elastic force.
According to claim 1, On one side of the piston 3,

2-stroke external combustion heat engine, characterized in that the piston seal which further blocks the leakage of the material through the gap between the piston (3) and the cylinder (2).