CN217440162U

CN217440162U - Scavenging channel type two-stroke cylinder

Info

Publication number: CN217440162U
Application number: CN202120936037.0U
Authority: CN
Inventors: 倪文彬; 黄建平
Original assignee: Jiangsu Dartek Technology Co Ltd
Current assignee: Jiangsu Dartek Technology Co Ltd
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2022-09-16
Anticipated expiration: 2031-05-06

Abstract

The utility model discloses a two-stroke cylinder of scavenging passageway formula, including the cylinder body, this internal combustion chamber, scavenging route, air inlet and gas vent of being provided with of cylinder, the top of cylinder body is provided with the spark plug, scavenging route sets up on the inner wall of combustion chamber, the gas vent runs through in cylinder body to the combustion chamber, be provided with the apron in the scavenging route, the apron cuts off scavenging route and makes scavenging route form the scavenging route with the combustion chamber, and the both ends of scavenging route set up discharge gate and feed inlet respectively, the discharge gate is located the combustion chamber, and the degree of depth is less than the gas vent, feed inlet and gas source intercommunication. The gas can be stably supplied, carbon deposition caused by the fact that waste gas enters the crankcase is avoided, the combustion efficiency and the emission performance are improved, and the service life of the engine is prolonged.

Description

Scavenging channel type two-stroke cylinder

Technical Field

The utility model relates to a cylinder, concretely relates to two-stroke cylinder of scavenging channel formula.

Background

The existing two-stroke engine cylinder scavenging passage is open, fresh combustible gas of a crankcase is pressed into a combustion chamber through the scavenging passage for combustion and explosion of the engine when a piston moves downwards, and the scavenging passage in the open state can not provide stable gas supply for the combustion chamber. In addition, when the piston passes through the exhaust port for exhausting the exhaust gas, a small amount of exhaust gas enters the large-area exposed scavenging passage, and under the condition that the engine runs at a high speed, the exhaust gas entering the scavenging passage cannot return to the cylinder again in time, but can quickly enter the crankcase. These exhaust gases can produce carbon deposits on the crankcase chamber surfaces and piston surfaces, increasing friction between the piston surfaces and the cylinder, reducing engine life.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a two-stroke cylinder of scavenging channel formula, its supply gas that can be stable avoids waste gas to get into the carbon deposit that the crankcase caused, has improved combustion efficiency and emission performance to and the life of engine.

In order to solve the technical problem, the utility model provides a two-stroke cylinder of scavenging passageway formula, including the cylinder body, this internal combustion chamber, scavenging route, air inlet and the gas vent of being provided with of cylinder, the top of cylinder body is provided with the spark plug, scavenging route sets up on the inner wall of combustion chamber, air inlet and gas vent run through cylinder body to the combustion chamber in, be provided with the apron in the scavenging route, the apron cuts off scavenging route and makes scavenging route form scavenging route with the combustion chamber, and the both ends of scavenging route set up discharge gate and feed inlet respectively, the discharge gate is located the combustion chamber, and the degree of depth is less than the gas vent, feed inlet and gas source intercommunication.

Preferably, a baffle is arranged at the end part of the cover plate, the baffle covers a communication channel between the scavenging passage and the crankcase, and the plurality of feed inlets are formed in the baffle.

Preferably, the number of the feed openings is 3.

Preferably, there is one air inlet and one air outlet respectively, there are two scavenging ducts, and a connecting line of the air inlet and the air outlet is perpendicular to a connecting line formed by the two scavenging ducts.

Preferably, the cylinder body is provided with a first threaded hole, the cover plate is provided with a second threaded hole, and bolts penetrate through the first threaded hole and the second threaded hole.

Preferably, a partition plate for splitting the scavenging passage into at least two parts is arranged in the scavenging passage.

Preferably, the partition plate is pushed against the cover plate.

Preferably, the cylinder body is cast or formed by turn-milling.

Preferably, the scavenging passage is integrally cast and molded with the cylinder body, and the scavenging passage sinks into the inner wall of the combustion chamber; or the scavenging passage is formed by turning and milling after the cylinder body is formed.

Compared with the prior art, the beneficial effects of the utility model are that:

through the optimized design, the fuel gas can enter the combustion chamber through the feed inlet, the scavenging channel and the discharge port; exhaust gas generated after combustion may be exhausted from the combustion chamber via an exhaust port. When the piston reciprocates in the combustion chamber: for the compression stroke, after the piston reaches a work doing static dead point (namely, a bottom dead point in fig. 2), the piston moves towards the inner direction of the combustion chamber, and the fuel gas is compressed and heated; for the power stroke, when the piston reaches or is close to the point of compression rest (i.e., top dead center in fig. 2), the spark plug ignites the gas, which combusts to produce work. In the expansion stroke, the spark plug moves towards the outside of the combustion chamber, when the piston passes over the exhaust port and the air inlet, the burnt waste gas is discharged from the exhaust port, the pressure in the combustion chamber is reduced, and meanwhile, air enters from the air inlet; the gas may enter the combustion chamber directly as the piston passes over the inlet, or may continue to enter the combustion chamber under pressure control, or may enter the combustion chamber under pressure control. The scavenging passage and the cover plate form a scavenging passage in the cylinder and isolate a crankcase of the scavenging passage, so that the scavenging passage can stably supply fuel gas for the combustion chamber without being influenced by the motion of the piston, and the operation of the engine is more stable; meanwhile, the outer surfaces of the crank case and the piston are not influenced by carbon deposition, so that the service life of the engine is prolonged; in addition, the scavenging channel can provide a bound space when fuel oil and air are mixed, the uniformity degree of the fuel oil and air mixing is improved, the combustion efficiency is higher, and the emission performance of the engine can be effectively improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of the explosion structure of the present invention;

fig. 2 is a schematic sectional view of the present invention.

The fuel gas engine comprises a cylinder body 10, a combustion chamber 11, a spark plug 12, a radiating fin 13, a scavenging passage 20, a discharge port 21, a mounting groove 22, a partition plate 23, a threaded hole I24, a baffle plate 30, a cover plate 31, a mounting strip 32, a feed port 33, a reinforcing rib 34, a threaded hole II 35, a bolt 36, an air inlet 40 and an air outlet 41.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

Examples

Referring to fig. 1 to 2, the present invention discloses a scavenging channel type two-stroke cylinder, which includes a cylinder body 10. The cylinder body 10 is internally provided with a combustion chamber 11, a scavenging passage 20 and an exhaust port 41, and the top of the cylinder body 10 is provided with a spark plug 12. The scavenging duct 20 opens on the inner wall of the combustion chamber 11. The exhaust port 41 penetrates the cylinder body 10 into the combustion chamber 11. A cover plate 31 is provided in the scavenging duct 20. The cover plate 31 separates the scavenging passage 20 from the combustion chamber 11 to form a scavenging passage for the scavenging passage 20, and the two ends of the scavenging passage are respectively provided with a discharge port 21 and a feed port 33. The discharge port 21 is located in the combustion chamber 11 and has a depth smaller than the exhaust port 41. The feed port 33 is in communication with a source of combustion gases. With the optimized design, the fuel gas can enter the combustion chamber 11 through the feed inlet 33, the scavenging channel and the discharge outlet 21; exhaust gas generated after combustion can be discharged from the combustion chamber 11 through the exhaust port 41. When the piston reciprocates in the combustion chamber 11: for the compression stroke, after the piston reaches a work-doing dead center (i.e. a bottom dead center in fig. 2), the piston moves towards the inner direction of the combustion chamber 11, and the fuel gas is compressed and heated; for the power stroke, when the piston reaches or is close to the compression resting point (i.e., the top dead center in fig. 2), the spark plug 12 ignites the gas, and the gas combustion applies work to the outside. In the power stroke, the ignition plug 12 moves outward from the combustion chamber 11, and when the piston passes over the exhaust port 41 and the intake port 40, the burned exhaust gas is discharged from the exhaust port 41, the pressure in the combustion chamber decreases, and air enters from the intake port 40. The scavenging passage 20 and the cover plate 31 form a scavenging passage in the cylinder, and a crankcase of the scavenging passage 20 is isolated, so that the scavenging passage 20 can stably supply fuel gas to the combustion chamber 11 without being influenced by the motion of the piston, and the operation of the engine is more stable; meanwhile, the outer surfaces of the crank case and the piston are not influenced by carbon deposition, so that the service life of the engine is prolonged; in addition, the scavenging channel can provide a bound space when fuel oil and air are mixed, the uniformity degree of the fuel oil and air mixing is improved, the combustion efficiency is higher, and the emission performance of the engine can be effectively improved.

Specifically, the cylinder body 10 is cast or formed by turn-milling. The cylinder body 10 is externally provided with a heat sink 13. The combustion chamber 11 is opened in the cylinder body 10. The ignition plug 12 is provided at the bottom of the combustion chamber 11 and is connected to an external ignition control part. The piston is slidably disposed within the combustion chamber 11. The cylinder body 10 is provided on the crankcase. A crankshaft is arranged in the crankcase. The crankshaft is connected with the piston.

The scavenging passage 20 may be integrally cast with the cylinder body 10, or may be formed by turning after the cylinder body 10 is formed. The scavenging duct 20 is sunk into the inner wall of the combustion chamber 11. The scavenge passage 20 communicates with the crankcase.

The cover plate 31 may be installed by installing installation grooves 22 on both sides of the scavenging duct 20. Mounting bars 32 are provided on both sides of the cover plate 31. The mounting slot 22 conforms to the size and shape of the mounting bar 32. The mounting bar 32 is mounted in the mounting groove 22.

In order to fix the position of the cover plate 31, a first threaded hole 24 may be formed in the cylinder body 10, and a second threaded hole 35 may be formed in the cover plate 31. And bolts 36 are arranged in the first threaded holes 24 and the second threaded holes 35. The disassembly and assembly are convenient to maintain.

The end of the cover plate 31 is provided with a baffle 30. The baffle 30 covers a communication passage between the scavenging passage 20 and the crankcase. A plurality of feed openings 33 are provided in the baffle 30. The plurality of feed openings 33 can further improve the mixing uniformity of the fuel and the air. Preferably, the number of the feed ports 33 is 3.

In addition, a partition plate 23 may be provided in the scavenging passage 20. The partition 23 enables the scavenging duct 20 to be split into at least two parts communicating with each other to further complicate the flow of fuel and air and further improve the homogeneity of the mixing thereof.

The partition 23 can be pushed against the cover plate 31 to prevent the cover plate 31 from deforming under high temperature and high pressure.

The cover plate 31 is provided with a reinforcement 24. The reinforcement 24 is located within the scavenge duct 20. The reinforcement 24 increases the structural strength of the cover plate 31 without affecting the movement of the piston.

The number of the air inlets 40 and the number of the air outlets 41 are one, the number of the scavenging passages 20 is two, and a connecting line of the air inlets 40 and the air outlets 41 is perpendicular to a connecting line formed by the two scavenging passages 20. It can improve the efficiency of feeding, exhaust, and the stability of engine operation.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a two-stroke cylinder of scavenging passageway formula, a serial communication port, including the cylinder body, this internal combustion chamber, scavenging route, air inlet and gas vent of being provided with of cylinder, the top of cylinder body is provided with the spark plug, scavenging route sets up on the inner wall of combustion chamber, air inlet and gas vent run through the cylinder body to the combustion chamber in, be provided with the apron in the scavenging route, the apron cuts off scavenging route and makes scavenging route form the scavenging route with the combustion chamber, and the both ends of scavenging route set up discharge gate and feed inlet respectively, the discharge gate is located the combustion chamber, and the degree of depth is less than the gas vent, feed inlet and gas source intercommunication.

2. The scavenging passage type two-stroke cylinder according to claim 1, wherein the end of the cover plate is provided with a baffle plate covering the communication passage between the scavenging passage and the crankcase, and a plurality of the feed ports are opened in the baffle plate.

3. A scavenging passage type two-stroke cylinder as claimed in claim 2, wherein the number of said feed ports is 3.

4. A scavenging path type two-stroke cylinder as claimed in claim 1 wherein there is one of said intake port and exhaust port, and there are two of said scavenging paths, and the line connecting said intake port and exhaust port is perpendicular to the line connecting the two scavenging paths.

5. The scavenging duct type two-stroke cylinder as claimed in claim 1, wherein the cylinder body is provided with a first threaded hole, the cover plate is provided with a second threaded hole, and bolts are inserted into the first threaded hole and the second threaded hole.

6. A scavenging channelled two-stroke cylinder as claimed in claim 1 wherein a partition is provided within the scavenging channel which splits the scavenging channel into at least two parts.

7. A scavenging passage type two-stroke cylinder as claimed in claim 6 wherein said partition plate is urged against the cover plate.

8. A scavenging passage type two-stroke cylinder as claimed in claim 1, wherein the cylinder body is cast or turn-milled.

9. A scavenging passage type two-stroke cylinder according to claim 8, wherein the scavenging passage is integrally cast with the cylinder body, and the scavenging passage is sunk into the inner wall of the combustion chamber; or the scavenging passage is formed by turning and milling after the cylinder body is formed.