JPS63185586A - Internal combustion piston drive - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to scavenging of an internal combustion type piston body Uj device, such as a driving machine, which uses combustion energy of gas to drive a piston.

[Background of the invention]

U.S. Pat. No. 44 (13722) is an example of a conventional technology for an internal combustion piston drive device that uses the combustion energy of gas to drive a piston in a driving machine. Scavenging air is generated using a fan located inside the combustion chamber and rotated by an electric motor.In this structure, the fan is exposed in the combustion chamber groove, so repeated combustion explosions of gas can cause the fan and electric motor to It had the disadvantage of being damaged.

[Purpose of the invention]

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, improve the durability of the scavenging device of this type of internal combustion piston drive, and improve the scavenging capacity of the internal combustion piston drive.

[Summary of the invention]

The present invention has the advantage that by releasing a portion of the high-temperature, high-pressure combustion gas inside the combustion chamber during the driving stroke of the piston, when the piston returns to its pre-operation position, the combustion gas cools down and creates a vacuum inside the combustion chamber. The combustion chamber opening/closing device was devised so that after the piston returns, the combustion chamber is opened to the atmosphere and outside air is sucked into the combustion chamber.

[Embodiments of the invention]

1, 2, 3, 4, 5, 6, and 7 show an embodiment of the gas combustion type piston drive device according to the present invention, for example, the structure of a driving machine. Explain using.

@1 In the figure, 1 is a housing having an outlet opening therein, 46 is a cylinder cover fixed to the outlet opening side of the housing, 2 is a cylinder that can slide in a space surrounded by the cylinder cover 46 and the housing 1; 3 is the above 1
A piston is slidable inside the cylinder 2, and a guide 4 is fixed to the opposite side of the housing l of the cylinder cover. Inside the guide 4, a rod 5 fixed to the piston 3 slides as if driving a nail (not shown).

A nail feeder 6 for inserting the needle into the guide 4 is attached to the side of the kite 4.

The portion of the piston 3 that slides on the cylinder 2 is provided with O.
A ring y is installed to maintain airtightness, and the space closed by the housing l, cylinder 2, and piston 3 forms a combustion chamber 7, and the combustion chamber 7a is formed by grids 15a-L5c installed inside the combustion chamber 7. ~7]. 448-44d are gaps existing on the entire surface of the gratings 15a-L5c.

Reference numeral 16 denotes an ignition control device that uses a piezoelectric element or the like to generate a high voltage in the ignition plug grease located inside the combustion chamber 7 to ignite the fuel. ( is a fuel cylinder contained inside the housing 1; (5 is a fuel piston that slides inside the fuel cylinder; 9 is a fuel chamber limited by the fuel cylinder holder and the fuel piston; The inside is filled with liquefied fuel gas such as butane, and compressed by a pressure spring 3n installed on the opposite side of the fuel piston, and the liquefied fuel gas is kept in a liquid phase.
7 is a sliding measuring cylinder. 38 is a measuring chamber surrounded by a measuring cylinder 36 and a seven-view valve 37, as shown in FIG. ■ is a temperature control device for heating the Keisha room paper. FIG. 6 shows the structure of the thirst control device (2). A resistor 4 installed around the measuring chamber 38 by a power source 41
2 generates heat, and the liquefied fuel inside the metering chamber 1 is heated.

When the temperature of the liquefied fuel increases by 1, the resistance of the heat-sensitive element 40 mounted around the measuring chamber increases, the heat generated from the resistor 42 decreases by 1, and the heating of the liquefied fuel is controlled to be suppressed. . l (l is the vaporization chamber bounded by the housing 1 and the nozzle 39 adjacent to the combustion chamber 7.

(32 is a first passage connecting the fuel chamber 9 and the metering cylinder 36. 32 is a second passage connecting the metering cylinder 36 and the vaporizing chamber 10. The positions of the first passage 31 and the second passage 32 are as follows. A condition is set: When the metering pulp 37 is at the top dead center as shown in FIG.
2 passages: 32 are not closed to the metering chamber. When the metering valve 37 is at the dead center as shown in Fig. 7, the needle chamber A is in the second position.
It communicates with the vaporization chamber w+ through a passage 32.

A ventilation sleeve 20 is located on the wall of the housing 1 of the combustion chamber 7 and slides around the housing 1 outside the combustion chamber 7 so as to open and close an exhaust port 24 and a scavenging port 25 communicating with the outside. The air is provided in the ventilation sleeve 20, and when the ventilation sleeve slides.

As shown in FIG. 5, the scavenging port 25 is a communication path for communicating with the outside air.

26 is a piston stop part located at the end of the cylinder 2 on the grating side and has a larger diameter than other piston sliding parts;
When the O ring moves toward the grid 15 side, the O ring moves to the piston stop portion 26, and the elastic force of the OL1 ring 14 causes the piston 3 to stop on the grid 15 side.

A cylinder damper b is attached to the outlet opening of the combustion chamber 7 on the piston 3 side to prevent the piston 3 and cylinder 2 from moving toward the grid side. A piston damper n is attached to the guide 4 side of the cylinder cover 46 to limit the driving stroke of the piston 3.

8 is a pressure accumulation chamber closed by the housing 1, the cylinder 2, the cylinder cover 46, and the ventilation sleeve Δ). Reference numeral 11 denotes a pressure accumulating port which connects the pressure accumulating chamber 8 and the cylinder 2 on a wall surface extending from the bottom dead center of the cylinder 2 on the driving side.

2] is a pressure accumulation valve that blocks the flow from the pressure accumulation chamber 8 side to the cylinder 2. ν is an intake port that connects the cylinder 2 to the outside air at the bottom dead center extension of the piston 3. In the intake valve, n is an intake valve that blocks the flow of air from the cylinder 2 side to the outside air side. The public is a pressure sensitive chamber surrounded by the control sleeve 45 on the outer wall of the cylinder 2 and the housing 1. r (is pressure sensitive chamber 2
The control port on the wall of the cylinder 2 that leads to the lattice of the cylinder 2 is a decompression path that communicates with the outside air from the side of the cylinder on the 5 side. 2'' is a pressure reducing valve that prevents the flow of air from the outside air side to the cylinder 2 side in the pressure reducing path 43. CII Linda 2
A cylinder spring 4 is attached to the outside of the cylinder 2 to bias the cylinder 2 in the direction of the grid, and the cylinder 2 side of the decompression path is opened and closed by the cylinder 2 and the cylinder damper 19.

Next, Fig. 1 shows the state of this driving machine before operation.

The piston 1 is stopped at a piston stop section.

An exhaust port 24 and a scavenging port 25 on the wall of the combustion chamber 7 are opened by a ventilation sleeve 20, as shown in FIG.

The cylinder 2 side of the pressure reduction path 43 is closed.

The metering pulp 37 is positioned at the top dead center side as shown in FIG. 7, and the inside of the metering chamber is filled with liquefied furnace material gas through the first passage 31. The liquefied fuel gas in the metering chamber is heated by the temperature control device (■).

Next, the operation of this driving machine will be explained. Ventilation space 1l-
12) to the position shown in Fig. 4 and close the exhaust port 24 and scavenging port 25 of the combustion chamber 7, respectively, and then slide the metering pulp blade to the position shown in Fig. 7 to remove the liquefied fuel in the metering chamber vane. Gas is sent to the vaporization chamber 10. The vaporized fuel is ejected through the nozzle 39, and the combustion chamber 7 is filled with a combustible mixture of air and fuel gas.

Next, the ignition control device iJ'i discharges the spark plug and ignites the fuel mixture. The combustion gas expands due to combustion inside the combustion chamber, and the unburned gas that has not yet been burned is pushed, and the unburned gas flows into the combustion chamber through the gaps 44 of each grid 15a to 15C. However, the unburned gas in the combustion chamber 7b flows into the combustion chamber k, and the unburned gas flows in the direction of the piston 3 one after another. During this time, passing through the gap 44 1. The unburned gas flows through grid L5, which becomes an obstacle to the flow.
A vortex is generated downstream of 5, creating a turbulent flow. The flame in the combustion chamber k is a laminar premixed flame and has a low combustion speed, but when the flame propagates and passes through the gap 471a of the grid 15a, the flame in the combustion chamber becomes a turbulent premixed flame and the combustion speed increases due to turbulence. do. As the combustion speed increases, the flow speed of the unburned gas flowing into the combustion chamber t from the combustion chamber 7b increases, and the vortex generated downstream of the grid 15b becomes even stronger, resulting in a strong turbulent flow. This strong turbulence causes the flame to propagate into the combustion chamber force, further increasing the combustion rate. In this way, the combustion speed increases every time the flame passes through the grate 15, and the pressure inside the housing 1 instantly becomes high.

With this pressure, as shown in FIG. The royal air on the side of the guide 4 is compressed and pushed out to the pressure accumulation chamber 8 via the pressure accumulation valve 21 to accumulate pressure. At this time,
The intake port ν is closed by an intake valve 22.

When the piston 3 collides with the piston damper n, the compression drive stroke ends, and the piston damper n attenuates the impact of the collision with the piston 3. After the combustion reaction of the fuel filled in the combustion chamber 7 is completed, the increase in temperature and pressure inside the combustion chamber 7 ends. The pressure inside the cylinder 2 rose by L, and a force was applied to the control sleeve 45 of the pressure sensitive chamber 28 in the direction of the guide 4, causing the cylinder 2 to slide in the direction of the guide 4 against the compression force of the cylinder spring 4. At this time, the pressure reducing path (4) opens, and the high temperature and high pressure gas after combustion inside the combustion chamber 7 is released to the atmosphere via the pressure reducing valve n.
The pressure and temperature inside cylinder 2 decrease. When the pressure on the pressure sensitive chamber side decreases, the cylinder 2 returns to its pre-operation position due to the restoring force of the piston spring 4, contacts the cylinder damper b, closes the pressure reducing path again, and closes the combustion chamber 7.

After colliding with the piston damper n, the piston 3 enters a return stroke in the grid direction. The pressure in the upper chamber side of the piston 3 decreases due to the release of combustion gas and becomes a vacuum. Atmospheric air is sucked into the lower chamber side of the piston 3 through the intake valve n, and due to the pressure difference, the piston 3 slides in the direction of the grid L5, and the cylinder damper b restricts the sliding toward the grid L5 side, resulting in OQ. Due to the elastic force of the ring, the piston returns to the stopped position E. During this time, the pressure accumulation chamber 8 is closed by the pressure accumulation valve 21.

Next, slide the ventilation sleeve to the position shown in Figure 5, connect the communication port 33 and the scavenging port 25 while keeping the exhaust port 24 closed, and draw outside air into the combustion chamber 7 using the vacuum inside the combustion chamber 7. Com. The concentration of combustion gas inside the combustion chamber 7 is determined by the scavenging port 25.
The zero boundary is high in areas further away from the city, and the concentration of combustion gas is low in areas close to the scavenging vent site. Next, ventilation 11-
120 to the position shown in FIG. 3, open the scavenging port 25 and exhaust 124, respectively, and send the accumulated air in the pressure accumulating chamber 8 to the combustion chamber 7 from the side of the scavenging port 25 where the concentration of surrounding combustion gas is low.
The gas on the side where the combustion gas concentration is higher is pushed out through the exhaust port 24 and discharged. Thereby, the combustion gas inside the combustion chamber 7 can be discharged more efficiently with the same amount of accumulated air. The combustion gas inside the combustion chamber 7 is exchanged with air,
Complete scavenging.

In the embodiment, the opening for sucking air into the combustion chamber using vacuum and its opening/closing control are provided in the scavenging port 25 located on the wall of the housing 1 and in the ventilation slot I + -. The connecting line was connected to the atmosphere and used.

As a first modification of the scavenging device for an internal combustion type piston drive device of the present invention, a structure is shown in which a suction port 47 is located near the scavenging port on the wall of the housing 1 and can be opened and closed by controlling the intake valve period.

As shown in FIG. 8, the scavenging device for the combustion chamber 7 before operation in the first modification example closes the communication port during the suction pulp stage, closes the suction port 47 during the ventilation valve stage, and connects the exhaust port 24 and pressure accumulation. The scavenging ports 25 leading to the chamber 8 are closed. Next, the ventilation sleeve is slid to the position shown in FIG. 9, the exhaust port 24 and the scavenging port 25 are closed, and the combustion chamber 7 is closed. Thereafter, similarly to the embodiment, the driving stroke and return stroke of the piston are completed, the piston 3 is returned to the piston stop position, and the inside of the combustion chamber 7 is maintained in a vacuum. Next, as shown in FIG. 1, with the exhaust port 24 and the scavenging port 25 closed, the suction valve 4
8, the communication port is opened to create a vacuum inside the combustion chamber 7 and draw in outside air. Next, as shown in FIG. Then, the exhaust port 24 and the scavenging port 25 are opened, and the accumulated air is sent from the pressure accumulating chamber 8 through the scavenging port 24 to the combustion chamber 7, and the combustion gas inside the combustion chamber 7 is discharged to the exhaust port 24 to perform scavenging.

In the first modified example, it is possible to form an area with a low concentration of combustion gas by using the vacuum around the suction port located near the scavenging port 25 and introduce the outside air, and the same effect as in the embodiment is achieved. can be obtained.

Next, as a second modification, a scavenging device having a structure in which no communication path 33 is provided will be described.

FIG. n shows the state of the second modification before operation, in which the ventilation sleeve opens an exhaust port 24 to the outside air and a scavenging port 25 which can be connected to the pressure accumulation chamber 8, respectively. Figure ν shows a state in which the combustion chamber 7 is closed. The exhaust port 24 and the scavenging port 25 are each closed by a ventilation valve 20. After the piston 3 completes driving, the vacuum inside the combustion chamber 7 is maintained, the ventilation pulp is slid to the position shown in Fig. Inhale. Next, the ventilation valve is slid to the position shown in FIG.

In the second modification, the sliding distance of the ventilation sleeve is small, and the scavenging device can be made smaller.

〔Effect of the invention〕

According to the present invention, since the vacuum inside the combustion chamber is used to ventilate the gas inside the combustion chamber, it is possible to reduce the amount of air that must be forcibly sent to the combustion chamber for scavenging. The scavenging capacity of the scavenging device can be improved and the scavenging device can be made smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional side view showing a driving machine which is an embodiment of the internal combustion type piston drive device according to the present invention in a state before a driving operation. FIG. 2 is a vertical cross-sectional side view showing the state of the driving machine during driving. Figures 3, 4, and 5 show that in the embodiment of this patent,
This is an enlarged longitudinal cross-sectional view showing the relative relationship between the communication path of the ventilation sleeve of this driving machine and the exhaust port and scavenging port of the combustion chamber housing. Figure 3 shows the state before the driving operation, and Figure 4 The figure shows the state when gas is burning in the combustion chamber, and in Figure 5, after the return stroke of the piston is completed, the exhaust port and scavenging port of the combustion chamber remain closed, and the scavenging port is in communication with the communication port. FIG. 6 is a partially enlarged cross-sectional view showing the structure of the temperature control device for heating the fuel and the state in which the metering chamber is in communication with the combustion chamber. FIG. 7 is a partially enlarged cross-sectional view showing a state in which the metering chamber is in communication with the vaporization chamber. Figures 8, 9, and 10 show the ventilation sleeve of the main driving machine, the suction pulp that opens and closes the communication path provided in the ventilation sleeve, and the exhaust air of the combustion chamber housing in a modification of Figure 1. These are enlarged longitudinal cross-sectional views showing the relative relationship between the port and the scavenging port. Fig. 8 shows the state before the driving operation, Fig. 9 shows the state when gas is burning in the combustion chamber, and Fig. 9 shows the state before the driving operation. ) [Figure 1 shows a state in which after the return stroke of the piston is completed, the exhaust port and scavenging port of the combustion chamber remain closed, and the suction port is in communication with the communication port. Figures 11, ν, and 8 are enlarged vertical cross-sectional views showing the relative relationship between the ventilation sleeve of the H filter book driving machine, the exhaust port of the combustion chamber housing, and the scavenging port in the second modification. Figure n shows the state before the driving operation, Figure 2 shows the state when gas is burning in the combustion chamber, and Figure 13 shows the state of the combustion chamber after the piston has completed its return stroke. This shows a state in which the scavenging port remains closed and the exhaust port is in communication with the outside. In the figure, 1 is a housing, 2 is a cylinder, 3 is a piston, 7 is a combustion chamber, 9 is a fuel chamber, r (is a control port, 16 is an ignition control device, Δ) is a ventilation sleeve, n is a pressure reducing valve, 24
25 is an exhaust port, 25 is a scavenging port, 28 is a pressure sensitive chamber, 4 is a cylinder spring, a container is a communication path, 43 is a pressure reduction path, 柘 is a control sleeve, 47 is a suction port, and 48 is suction pulp. Patent Applicant Name Hitachi Osama Co., Ltd.

Claims (1)

[Scope of Claims] 1) A housing having an outlet opening therein, a combustion chamber defined by a piston sliding inside a cylinder adjacent to the outlet opening of the housing, and a device for filling the combustion chamber with air and fuel. , a device for igniting a mixture of fuel and air filled inside a combustion chamber, a means for driving a piston with expanded combustion gas, and a device for driving a piston inside the combustion chamber after the piston has completed its driving stroke and returned to its pre-operation position. In an internal combustion piston drive device having a means for maintaining the combustion chamber in a vacuum, after the piston completes its driving stroke and returns to its pre-operation state, a first opening provided in the housing that can be opened and closed is opened, and the inside of the combustion chamber is opened. An internal combustion type piston drive device characterized by being equipped with a scavenging device that exhausts combustion gas inside the combustion chamber after sucking air into the combustion chamber using a vacuum. 2) After sucking air into the combustion chamber using the vacuum inside the combustion chamber, the air is forcibly introduced into the combustion chamber through the first opening, and the first
Claim 1, further comprising a scavenging device that opens a second opening that can be opened and closed differently from the opening and discharges combustion gas inside the combustion chamber through the second opening. internal combustion piston drive. 3) After sucking air into the combustion chamber using the vacuum inside the combustion chamber, open the second opening of the housing, which can be opened and closed, located around the opening of the scavenging device, and suck air into the combustion chamber. The combustion chamber is characterized by a scavenging device that forcibly introduces combustion gas through two openings, opens a third opening of the housing that can be controlled to open and close, and discharges combustion gas from the combustion chamber through the third opening. An internal combustion type piston drive device according to claim 1. 4) After sucking air into the combustion chamber using the vacuum inside the combustion chamber, a second opening of the housing that can be controlled to open and close, which is different from the first opening of the combustion chamber, is opened to force air into the combustion chamber. 2. The internal combustion piston drive device according to claim 1, further comprising a scavenging device for introducing combustion gas into the combustion chamber and discharging combustion gas inside the combustion chamber through the first opening.