Mechanical-hydraulic hybrid engine

Abstract

The utility model discloses a mechanical-hydraulic hybrid engine. The mechanical-hydraulic hybrid engine comprises a first air cylinder, a second air cylinder, a linear connecting shaft and a hydraulic pump. The two air cylinders are horizontally arranged oppositely, air cylinder pistons of the two air cylinders are in transmission connection with the two ends of the connecting shaft, and the middle of the connecting shaft is sleeved with an annular piston which is located in the hydraulic cylinder body. A first outlet and a first inlet are formed in one end of the hydraulic cylinder body in the long-axis direction, and a second outlet and a second inlet are formed in the other opposite end of the hydraulic cylinder body. And one-way valves are respectively arranged at the four inlets and outlets or connecting pipelines thereof. The mechanical-hydraulic series connection structure is stable and reliable.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of hybrid engines, and particularly relates to a machine-fluid hybrid engine. BACKGROUND

[0002] Oil-electric hybrid vehicles have been commercially available, which can reduce the idling operation of internal combustion engines. A machine-fluid hybrid engine is composed of an internal combustion engine and a hydraulic pump (a hydraulic cylinder or a hydraulic motor), and has a greater energy density.

[0003] Patent CN102748132A / 2012 discloses a machine-fluid dual-power output engine, which comprises an opposed-piston two-stroke internal combustion engine. The internal combustion engine directly outputs power through a crank mechanism and indirectly outputs power through the crank mechanism to drive a hydraulic pump.

[0004] Patent CN103147857A / 2013 discloses a horizontal opposed-cylinder engine, in which two cylinder pistons are located at two ends of a linear connecting shaft, and a hydraulic cylinder is connected to the middle of the connecting shaft. The hydraulic system is also used for cooling the cylinder and exhaust gas. The patent does not disclose the specific structure of the hydraulic cylinder. SUMMARY

[0005] The application aims to improve the machine-fluid transmission mechanism of a hybrid engine to improve the structural reliability.

[0006] The application discloses a machine-fluid hybrid engine. The machine-fluid hybrid engine comprises:

[0007] a first cylinder and a second cylinder, both of which are internal combustion engines and are arranged opposite to each other and horizontally side by side;

[0008] a connecting shaft configured in a linear shape, one end of which is connected to a cylinder piston of the first cylinder, and the other end of which is connected to a cylinder piston of the first cylinder, and which can repeatedly move in an extension direction under the alternating push of the first cylinder and the second cylinder; and

[0009] a hydraulic pump comprising a hydraulic cylinder body, an annular piston, four one-way valves and a plurality of connecting pipelines;

[0010] The hydraulic cylinder body is located between the first cylinder and the second cylinder, and has a first inlet and a second outlet at one end close to the second cylinder and a second inlet and a first outlet at the other end close to the first cylinder.

[0011] The four one-way valves are arranged one by one above the first outlet, the first inlet, the second outlet and the second inlet or on the connecting pipelines of the outlets and inlets.

[0012] The annular piston is fixedly sleeved on the middle part of the connecting shaft and located in the hydraulic cylinder body, and is used for pumping hydraulic oil into the first inlet and out of the second outlet or pumping hydraulic oil into the second inlet and out of the first outlet.

[0013] In some embodiments of the present application, the connecting pipelines of the first outlet and the second outlet are merged into another connecting pipeline, and the connecting pipelines of the first inlet and the second inlet are branched from another connecting pipeline.

[0014] In some embodiments of the present application, the first cylinder and the second cylinder are horizontally opposite and are both two-stroke reciprocating piston type gas internal combustion engines, and the connecting shaft is vertically fixedly assembled at the center of the cylinder piston of the first cylinder at one end and at the center of the cylinder piston of the second cylinder at the other end. Further, the first cylinder and the second cylinder are configured to use hydrogen as fuel gas. Still further, the first cylinder and the second cylinder are configured to use pure oxygen as combustion-supporting gas.

[0015] In some embodiments of the present application, the first cylinder and the second cylinder are both four-stroke reciprocating piston type fuel internal combustion engines, and the connecting shaft is vertically fixedly assembled at the center of the cylinder piston of the first cylinder at one end and at the center of the cylinder piston of the second cylinder at the other end.

[0016] In some embodiments of the present application, the first cylinder and the second cylinder are both triangular rotor piston type internal combustion engines, and the connecting shaft is driven by one cam respectively.

[0017] The technical solutions of the present application can obtain the following beneficial effects.

[0018] The machine-oil hybrid engine disclosed in the present application comprises a first cylinder, a second cylinder, a straight connecting shaft and a hydraulic pump. The two cylinders are horizontally opposite, and the cylinder pistons of the two cylinders are drivingly connected at the two ends of the connecting shaft. The annular piston is sleeved on the middle part of the connecting shaft and located in the hydraulic cylinder body. The long axis direction of the hydraulic cylinder body is provided with the first outlet and the first inlet at one end and the second outlet and the second inlet at the opposite end. The above four inlets and outlets or the connecting pipelines thereof are respectively provided with one-way valves. The machine-oil series structure is stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0019] The following drawings should be used in conjunction with the specific implementation part.

[0020] Figure 1 FIG. 1 is a structural schematic diagram of a machine-oil hybrid engine in an embodiment;

[0021] Figure 2a is Figure 1 FIG. 6 is a working state schematic diagram of a hydraulic pump in the machine-oil hybrid engine.

[0022] Figure 2b is Figure 1 Another working state of the hydraulic pump is shown in FIG. 4.

[0023] In the drawings, the hollow arrows represent hydrogen or oxygen, the white arrows indicate the moving direction of the annular piston, and the black arrows indicate the running direction of the hydraulic oil. DETAILED DESCRIPTION

[0024] The embodiments will be described below with reference to the accompanying drawings.

[0025] In this specification, unless specifically stated otherwise, one embodiment, some embodiments, and other embodiments are used to distinguish different embodiments, and do not mean all embodiments; the drawings are schematic drawings, not proportional drawings; the directions / positions of top, bottom, center, edge, inner, outer, far, near, long, wide, vertical, horizontal, upper, lower, front, back, left, right, etc. are based on the observation angle of the drawings, and cannot be understood as the components / devices being located at a specific position, facing a specific direction; the first, second, third, etc. ordinal words are used to distinguish the components / devices with the same function / name, and do not have the order meaning.

[0026] One embodiment of the machine-hydraulic hybrid engine 100 is shown in FIG. 1. Figure 1

[0027] The machine-hydraulic hybrid engine 100 includes a first cylinder 10, a second cylinder 20, a connecting shaft 50, a hydraulic pump 30, and a hydraulic oil tank.

[0028] The first cylinder 10 and the second cylinder 20 are both two-stroke reciprocating piston hydrogen-oxygen internal combustion engines, and have the same structure, are oppositely arranged, and are horizontally arranged side by side. The first cylinder 10 and the second cylinder 20 are respectively used to receive and mix hydrogen from a hydrogen gas source and oxygen from an oxygen gas source, so that the mixed gas is burned and expanded to push the respective cylinder pistons to reciprocate. Under the control of the engine electronic control system, the first cylinder 10 and the second cylinder 20 can alternately push the connecting shaft 50, so that the connecting shaft 50 reciprocates in the axial direction.

[0029] When the machine-hydraulic hybrid engine 100 is used for vehicles and ships, air is used as the combustion-supporting gas, a high-pressure hydrogen cylinder or a liquid hydrogen tank is used as the fuel gas source, and the engine is used to drive an external load 900, i.e. a vehicle main shaft or a ship shaftless pump jet system. The hydraulic oil tank can be configured and disassembled and replaced as needed. The above-mentioned hydrogen gas source, oxygen gas source, and hydraulic oil tank are not shown in FIG. 1. Figure 1

[0030] ​​The first cylinder 10 comprises a cylinder barrel 11, a cylinder piston 18 axially movable inside the cylinder barrel 11, an exhaust valve 12 arranged on the exhaust pipe 403 and close to the exhaust port, a spark plug 13 arranged at the outside end of the cylinder barrel 11 for ignition, an oxygen valve 14 arranged on the oxygen pipe 402 and close to the oxygen inlet, and a hydrogen valve 15 arranged on the hydrogen pipe 401 and close to the hydrogen inlet.

[0031] The second cylinder 20 comprises a cylinder barrel 21, a cylinder piston 28 axially movable inside the cylinder barrel 21, an exhaust valve 22 arranged on the other exhaust pipe 403 and close to the exhaust port, a spark plug 23 arranged at the outside end of the cylinder barrel 21 for ignition, an oxygen valve 24 arranged on the other oxygen pipe 402 and close to the oxygen inlet, and a hydrogen valve 25 arranged on the other hydrogen pipe 401 and close to the hydrogen inlet.

[0032] Please note that, Figure 1 The other aspects of the first cylinder 10 and the second cylinder 20 can be referred to CN107143421A / 2017 by simple drawing.

[0033] The connecting shaft 50 is linear, comprising a first shaft end 51, a second shaft end 52 and a shaft middle part 53.

[0034] The first shaft end 51 is vertically fixedly assembled at the center of the cylinder piston 18 at the end, and can slide out of and into the first cylinder 10. The second shaft end 52 is vertically fixedly assembled at the center of the cylinder piston 28 at the end, and can slide out of and into the second cylinder 20. The shaft middle part 53 is thinner than the first shaft end 51 and the second shaft end 52, and is always located outside the first cylinder 10 and the second cylinder 20.

[0035] That is, the connecting shaft 50 is transmissionally connected to the cylinder piston 18 of the first cylinder 10 at one end and to the cylinder piston 28 of the first cylinder 20 at the other end, and can repeatedly move in the extension direction (i.e. the axial direction) under the alternating driving of the first cylinder 10 and the second cylinder 20.

[0036] The hydraulic pump 30 comprises a hydraulic cylinder 31, an annular piston 38, four one-way valves and a plurality of connecting pipes.

[0037] The hydraulic cylinder 31 is a cylindrical member with sealed ends, and its cylindrical inner cavity contains the annular piston 38. The hydraulic cylinder 31 is provided with four inlets and outlets for installing the connecting pipes and the one-way valves. The hydraulic cylinder 31 is axially penetrated by the connecting shaft 50, and the outside of the hydraulic cylinder 31 is connected with the Y-shaped input pipe 301 and the Y-shaped output pipe 302.

[0038] The first inlet and the second outlet are arranged at one end of the hydraulic cylinder 31 close to the second cylinder 20. The second inlet and the first outlet are arranged at the other end of the hydraulic cylinder 31 close to the first cylinder 10. The connecting pipeline of the first inlet and the connecting pipeline of the second inlet are merged into another connecting pipeline, thereby forming a Y-shaped input pipeline 301. The connecting pipeline of the first outlet and the connecting pipeline of the second outlet are branched from the other connecting pipeline, thereby forming a Y-shaped output pipeline 302.

[0039] The connecting pipeline of the first inlet is provided with a first one-way valve 321, the connecting pipeline of the second inlet is provided with a second one-way valve 322, the connecting pipeline of the first outlet is provided with a third one-way valve 323, and the connecting pipeline of the second outlet is provided with a fourth one-way valve 324.

[0040] The annular piston 38 is located in the hydraulic cylinder 31 and is fixedly sleeved on the middle part of the connecting shaft 50. The gap between the annular piston 38 and the inner wall of the hydraulic cylinder 31 and the gap between the annular piston 38 and the connecting shaft 50 are sealed to prevent the hydraulic oil from penetrating.

[0041] Please refer to Figure 1 , Figure 2a and Figure 2b In operation, the electronic control system controls the first cylinder 10 and the second cylinder 20 to alternately push the connecting shaft 50, so that the annular piston 38 moves in the hydraulic cylinder 31 along with the connecting shaft 50 in the axial direction, thereby circulating the hydraulic oil between the hydraulic pump 30 and the hydraulic oil tank. The circulating pipeline of the hydraulic oil is connected to the external load 900, so that the hydraulic pump 30 can work on the external load 900. The circulating pipeline is also used for cooling the outer wall of the cylinder and recovering waste heat, and the related structure can be referred to in the patent CN103147857A / 2013.

[0042] Figure 2a In the working state shown in FIG. 2, the first cylinder 10 pushes the connecting shaft 50, and the annular piston 38 moves towards the second cylinder 20 to pump the hydraulic oil into the first inlet and out of the second outlet. At this time, the first one-way valve 321 and the third one-way valve 323 are cut off, and the second one-way valve 322 and the fourth one-way valve 324 are turned on.

[0043] Figure 2b In the working state shown in FIG. 3, the second cylinder 20 pushes the connecting shaft 50, and the annular piston 38 moves towards the first cylinder 10 to pump the hydraulic oil into the second inlet and out of the first outlet. At this time, the first one-way valve 321 and the third one-way valve 323 are turned on, and the second one-way valve 322 and the fourth one-way valve 324 are cut off.

[0044] With the above structure, the annular piston 38 repeatedly moves axially in the hydraulic cylinder 31, and its two non-return positions are adjacent to (but not colliding with) the axial end faces of the inner cavity, so as to reduce the dead volume of the hydraulic cylinder 31, and facilitate the purification treatment of the hydraulic oil and the service life of the hydraulic pump 30.

[0045] In the engine-hydraulic hybrid engine 100, two cylinders are horizontally opposite, and two cylinder pistons are drivingly connected to the two ends of the connecting shaft 50, the middle part of the connecting shaft 50 is sleeved with the annular piston 38, and the annular piston 38 is located in the hydraulic cylinder body 31; the long axis direction of the hydraulic cylinder body 31 is provided with a first outlet and a first inlet at one end, and a second outlet and a second inlet at the opposite end. The connecting pipelines of the above four outlets and inlets are respectively provided with one-way valves. In the above engine-hydraulic series structure, the annular piston is sleeved on the linear connecting shaft, and continuously pumps hydraulic oil by axial reciprocating motion, which is stable and reliable in performance.

[0046] In another embodiment, the four one-way valves of the hydraulic pump 30 are both mounted at one end of the corresponding interfaces of the hydraulic cylinder body 31, and the other end is communicated with the corresponding hydraulic pipeline.

[0047] In another embodiment, the inner cavity of the hydraulic cylinder body is an elliptical cylinder, so as to reduce the local height of the engine.

[0048] In another embodiment, the connecting shaft is a pipe with uniform outer diameter, so as to reduce the mass of the engine.

[0049] In other embodiments, the first cylinder and the second cylinder can be two-stroke reciprocating piston gasoline internal combustion engines, four-stroke reciprocating piston diesel internal combustion engines, or triangular rotor piston internal combustion engines. The triangular rotor piston internal combustion engine is driven by a connecting shaft through a cam. The above two cams are slidably abutted at the end of the connecting shaft.

[0050] The above embodiments, application examples and technical analysis are intended to introduce the technical concept and characteristics of the present application, so that those skilled in the art can implement the technical scheme of the present application, and do not constitute a limitation on the scope of protection. Simple modifications and equivalent transformations of the embodiments are within the scope of protection.

Claims

1. A hybrid engine, characterized by The machine-liquid hybrid engine comprises: a first cylinder and a second cylinder, both of which are internal combustion engines and are arranged opposite to each other and horizontally side by side; a connecting shaft arranged in a straight line, one end of which is connected to the cylinder piston of the first cylinder, and the other end of which is connected to the cylinder piston of the first cylinder, and which can repeatedly move in the extension direction under the alternating push of the first cylinder and the second cylinder; and a hydraulic pump comprising a hydraulic cylinder, an annular piston, four one-way valves and a plurality of connecting pipelines; wherein the hydraulic cylinder is located between the first cylinder and the second cylinder, and a first inlet and a second outlet are arranged at one end close to the second cylinder, and a second inlet and a first outlet are arranged at the other end close to the first cylinder; the four one-way valves are arranged one by one above the first outlet, the first inlet, the second outlet and the second inlet or on the connecting pipelines of these outlets and inlets; the annular piston is fixedly sleeved on the middle part of the connecting shaft and located in the hydraulic cylinder, and is used for pumping hydraulic oil into the first inlet and out of the second outlet or into the second inlet and out of the first outlet.

2. The machine-liquid hybrid engine according to claim 1, wherein: the connecting pipelines of the first outlet and the second outlet converge into another connecting pipeline; the connecting pipelines of the first inlet and the second inlet branch out from another connecting pipeline.

3. The machine-liquid hybrid engine according to claim 1, wherein: the first cylinder and the second cylinder are both two-stroke reciprocating piston gas internal combustion engines; one end of the connecting shaft is vertically fixedly assembled at the center of the cylinder piston of the first cylinder, and the other end is vertically fixedly assembled at the center of the cylinder piston of the second cylinder.

4. The machine-liquid hybrid engine according to claim 3, wherein: the first cylinder and the second cylinder are configured to use hydrogen as fuel gas.

5. The machine-liquid hybrid engine according to claim 4, wherein: the first cylinder and the second cylinder are configured to use pure oxygen as combustion-supporting gas.

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