CN209925055U - Natural gas engine with tree-shaped plate type ventilation system - Google Patents

Abstract

The utility model provides a natural gas engine with arborescent plate-type ventilation system. The natural gas engine with the tree-shaped plate type ventilation system comprises an engine body and a ventilation system arranged on the engine body, wherein the ventilation system comprises a primary separation device and a pre-separation device which are arranged in an installation groove in a cylinder head cover on the engine body, and an air-driven oil-gas separator fixed on the engine body; this natural gas engine with arborescent plate-type ventilation system can realize passive form and active separation of oil-gas mixture, forms engine ventilation closed circulation and need not external auxiliary assembly, and separation efficiency is high.

Description

Natural gas engine with tree-shaped plate type ventilation system

Technical Field

The utility model belongs to engine ventilation equipment field, concretely relates to natural gas engine with arborescent plate-type ventilation system.

Background

High-temperature fuel gas generated by the engine during operation can enter the crankcase through a gap between the piston group and the cylinder, so that blow-by gas is generated. The blowby gas is composed of unburned fuel gas, water vapor, exhaust gas, and the like. The water vapor is condensed in the engine oil to dilute the engine oil, so that the service performance of the engine oil is reduced; sulfur dioxide in the waste gas is oxidized in the air to generate sulfuric acid, so that the oxidative deterioration of engine oil is accelerated, and the corrosion and accelerated wear of engine parts can be caused; the blow-by gas also causes the pressure of the crankcase to be too high to damage the sealing of the crankcase, so that the engine oil leaks and runs off; the aging of the engine oil is accelerated, and the reliability is reduced. Therefore, it is desirable to control blow-by gas using a crankcase ventilation system. Blow-by gas can carry a large amount of oil gas when flowing through crankcase ventilation system, causes the engine oil loss, worsens the emission simultaneously, consequently must separate the oil gas, reduces the engine oil loss. The oil gas that removes to the engine is separated through integrated oil and gas separator in the cylinder head cover, and traditional cylinder head cover can only carry out single separation, and the effect can not reach the expectation, only relies on passive form separation to be difficult to satisfy the requirement of six engine emission standards in state moreover.

Chinese utility model patent as publication No. CN205559013U "a cylinder head cover", including the cylinder head cover body, cylinder head cover body inboard is formed with oil gas preseparation cavity, and this oil gas preseparation cavity is equipped with preseparation air inlet and preseparation gas outlet, follows in oil gas preseparation cavity the preseparation air inlet arrives the preseparation gas outlet is equipped with in proper order along vertical direction interval arrangement's a plurality of horizontal tree-like boards and is labyrinth interval arrangement's a plurality of vertical tree-like boards along the horizontal direction, forms the labyrinth oil gas passageway of intercommunication preseparation air inlet and preseparation gas outlet between horizontal tree-like board and the vertical tree-like board to it has oil and gas separator to integrate at the cylinder head cover lateral wall. Through the above contents, it can be found that the oil-gas separation center of the cylinder head cover in the prior art is located in the labyrinth oil-gas channel formed between the transverse tree-shaped plate and the longitudinal tree-shaped plate, but the oil-gas separation capability of the single-layer structure is poor, fine oil drops cannot be separated, the combination of passive separation and active separation cannot be realized, and the requirement of national emission of an engine cannot be met.

For example, the independent externally-hung multi-stage oil-gas separator assembly in the patent of the invention of China with the publication number of CN102705040B is a gas-driven active separator which can actively separate oil-gas mixture in a crankcase, but the national emission standard cannot be met only by adopting an active separating device.

For example, the chinese patent application with publication number CN108049937A, the cylinder head cover built-in oil-gas separation system, built-in oil-gas separator, includes: the labyrinth cavity comprises a cover body, a labyrinth cavity body and a bottom cover, wherein the labyrinth cavity body and the bottom cover are arranged on one side of the cover body; a rough filtering pore plate, a circuitous rectifying structure, a fine filtering pore plate and a position separating plate are arranged in the labyrinth cavity. Through the above, it can be found that the prior art cannot realize the combination of passive separation and active separation, and cannot meet the requirement of national emission of the engine.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art's defect, provide a natural gas engine with arborescent plate-type ventilation system, can realize passive form and active separation simultaneously, can satisfy six engine requirements in the state.

The utility model aims at realizing through the following technical scheme:

the utility model provides a natural gas engine with a tree-shaped plate type ventilation system, which comprises an engine body and a ventilation system arranged on the engine body, wherein the ventilation system comprises a primary separation device and a pre-separation device which are arranged on the engine body and are arranged in a mounting groove in a cylinder head cover, and an air-driven oil-gas separator fixed on the engine body; the primary separation device consists of at least two tree-shaped plates;

an air inlet hole for receiving an oil-gas mixture in a crankcase is formed in the mounting groove of the cylinder head cover, an exhaust hole for exhausting separated waste gas is further formed in the cylinder head cover, and an air outlet pipe connected with a waste gas inlet of the air-driven oil-gas separator is arranged on the exhaust hole; the compressed gas inlet of the gas-driven oil-gas separator is connected with a pressurized intercooling pipeline on the engine body through a gas taking pipe and is used for sucking the pressurized compressed gas of the engine to push an injection pump to generate negative pressure so as to overcome resistance required by collision separation; the mixed gas outlet of the gas-driven oil-gas separator is connected with the gas inlet of a gas compressor on the engine body through a vent pipe so as to realize closed circulation from gas inlet to gas outlet; and an oil return port of the gas-driven oil-gas separator is connected to an oil pan of the engine body through an oil return header pipe.

Preferably, pre-separator comprises parallel arrangement's orifice plate and baffle, be equipped with on the orifice plate and be used for carrying out the filtration pore that accelerates to oil gas mixture, be provided with the rib that is used for the collision separation oil to drip on the baffle.

Compared with the prior art, the utility model has the advantages of:

this natural gas engine with arborescent plate-type ventilation system can realize passive form and active separation of oil-gas mixture, forms engine ventilation closed circulation and need not external auxiliary assembly, and separation efficiency is high.

Drawings

Embodiments of the invention are further described below with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of an engine according to an embodiment of the present invention;

fig. 2 is a schematic view of a ventilation system according to an embodiment of the present invention;

fig. 3 is a schematic view of the internal structure of an engine cylinder head cover according to an embodiment of the present invention;

fig. 4 is a schematic three-dimensional structure diagram of an air-driven oil-gas separator according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a preseparation device according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a primary separating device for two tree plates according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a primary separating device for four tree-shaped plates according to an embodiment of the present invention.

In the drawing, 100 is an engine body, 101 is a fixing frame, 200 is a cylinder head cover, 201 is an air inlet, 202 is a mounting groove, 203 is an exhaust hole, 204 is an air outlet pipe, 205 is an air taking pipe, 206 is an oil return header pipe, 207 is a vent pipe, 300 is an air-driven oil-gas separator, 301 is an exhaust gas inlet, 302 is a compressed gas inlet, 303 is a mixed gas outlet, 304 is an oil return port, 400 is a primary separation device, 401 is a first tree-shaped plate, 402 is a second tree-shaped plate, 403 is a third tree-shaped plate, 404 is a fourth tree-shaped plate, 500 is a pre-separation device, 501 is an orifice plate, 502 is a baffle plate, 503 is a filter hole, and 504 is a rib.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail by the following embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The embodiment of the utility model provides a natural gas engine with arborescent board-like ventilation system, as shown in fig. 1, 2, including engine block 100 and the ventilation system that sets up on engine block 100, the ventilation system includes setting up on engine block 100 in cylinder head cover 200 installation groove 202 preliminary separation device 400 and preliminary separation device 500 (as shown in fig. 3), and fix the oil and gas separator 300 of the gas drive on engine block 100 through the mount 101; the primary separation device 400 is composed of at least two tree-shaped plates, as shown in fig. 6, the primary separation device 400 is composed of a first tree-shaped plate 401 and a second tree-shaped plate 402; as shown in fig. 7, the primary separation device 400 may further comprise a first tree plate 401, a second tree plate 402, a third tree plate 403 and a fourth tree plate 404; as shown in fig. 3, an air intake hole 201 for receiving an oil-gas mixture in a crankcase is opened on an installation groove 202 of the cylinder head cover 200, and the cylinder head cover 200 is further provided with an exhaust hole 203 for exhausting separated exhaust gas; as shown in fig. 2 and 4, the exhaust hole 203 is provided with an exhaust pipe 204 connected with an exhaust gas inlet 301 of the gas-driven oil-gas separator 300; a compressed gas inlet 302 of the gas-driven oil-gas separator 300 is connected with a pressurizing medium-cooling pipeline on the engine body 100 through a gas taking pipe 205, and is used for sucking the pressurized compressed gas of the engine to push an injection pump to generate negative pressure so as to overcome resistance required by collision separation; the mixed gas outlet 303 of the gas-driven oil-gas separator 300 is connected with an air inlet (not shown) of a compressor on the engine body 100 through a vent pipe 207 so as to realize closed circulation from air inlet to air outlet; the oil return port 304 of the gas-driven oil-gas separator is connected to the oil pan of the engine body 100 through the oil return header pipe 206.

In one embodiment, as shown in fig. 5, the preseparation device 500 is composed of an orifice plate 501 and a baffle plate 502 which are arranged in parallel, the orifice plate 501 is provided with filter holes 503 for accelerating the oil-gas mixture, and the baffle plate 502 is provided with ribs 504 for collision separation of oil drops.

For other structures of the natural gas engine, please refer to the prior art, and detailed description thereof is omitted.

Reference in the specification to "some embodiments," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with a feature, structure, or characteristic of one or more other embodiments without limitation, as long as the combination is not logical or operational. Additionally, the various elements of the drawings of the present application are merely schematic illustrations and are not drawn to scale.

Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.

Claims (1)

1. The utility model provides a natural gas engine with arborescent plate-type ventilation system, includes engine block and the ventilation system of setting on engine block, ventilation system is including setting up the primary separation device and the preseparation device of mounting groove in the cylinder head cover on engine block to and fix the oil-gas separator of air-driven on engine block, its characterized in that:

the pre-separation device consists of a pore plate and a baffle which are arranged in parallel, wherein the pore plate is provided with filter pores, and the baffle is provided with ribs;

the primary separation device is composed of at least two tree-shaped plates, an air inlet hole is formed in the mounting groove of the air cylinder cover, an exhaust hole is further formed in the air cylinder cover, an air outlet pipe connected with a waste gas inlet of the gas-driven oil-gas separator is arranged on the exhaust hole, a compressed gas inlet of the gas-driven oil-gas separator is connected with a supercharging intercooling pipeline on the engine body through an air taking pipe, a mixed gas outlet of the gas-driven oil-gas separator is connected with an air inlet of a gas compressor on the engine body through a vent pipe, and an oil return port of the gas-driven oil-gas separator is connected to.

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