CN217152138U

CN217152138U - EGR cooler of natural gas engine

Info

Publication number: CN217152138U
Application number: CN202220740222.7U
Authority: CN
Inventors: 费天翔; 侯令川; 冯康
Original assignee: China National Heavy Duty Truck Group Jinan Power Co Ltd
Current assignee: China National Heavy Duty Truck Group Jinan Power Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-08-09
Anticipated expiration: 2032-03-31

Abstract

The utility model relates to the technical field of natural gas engines, in particular to a natural gas engine EGR cooler, which comprises a shell, a core body and a condensation plate, wherein the core body is internally provided with flowing cooling water, and the core body and the condensation plate are sequentially arranged in the shell from top to bottom; the shell is provided with an air inlet, an air outlet, a water inlet and a water outlet, and cooling water enters the core body from the water inlet and flows out from the water outlet; waste gas enters the shell through the air inlet and then sequentially passes through the core body and the condensation plate and is discharged from the air outlet. This natural gas engine EGR cooler can reduce the pressure drop of waste gas flow through the EGR cooler, and the casing is inside to be provided with core and condenser plate, can separate out a large amount of moisture in the EGR gas, is favorable to the security and the stability of engine operation.

Description

EGR cooler of natural gas engine

Technical Field

The utility model relates to a natural gas engine technical field, concretely relates to natural gas engine EGR cooler.

Background

The application of natural gas engines in the technical route of commercial vehicles can be divided into three phases. The first generation technology adopts a lean combustion scheme, changes a fuel supply system (fuel oil is replaced by natural gas) and an ignition system of an engine on the basis of the whole engine of the original diesel engine, and is additionally provided with an oxygen sensor to control the air-fuel ratio, thereby realizing closed-loop control; the second generation technology adopts an equivalent combustion scheme, and on the basis of the first generation technology, high-pressure exhaust gas from the front of a turbocharger is introduced into a combustion chamber to realize EGR (high-pressure EGR for short) so as to reduce the combustion temperature and realize larger power output; the third generation technology is a technology which is being explored in the field of the existing heavy truck natural gas engine, and is different from the second generation technology in introducing high-pressure EGR, the third generation technology realizes EGR (low-pressure EGR for short) by introducing low-pressure exhaust gas from after-treatment into a combustion chamber, so that the engine can obtain more EGR exhaust gas in a low rotating speed range, and further obtains higher power and torque output.

And EGR refers to exhaust gas recirculation technology. The exhaust gas recirculation technology is a technology in which a part of exhaust gas generated by an engine is led out through an EGR valve and mixed into fresh air, and the part of exhaust gas and the fresh air are introduced into a cylinder of the engine together and are combusted again. The technology can greatly reduce the nitrogen oxides in the tail gas of the engine, thereby leading the engine to reach the emission standard. Including being used for among the exhaust gas recirculation system with the EGR cooler of exhaust gas cooling back refluence again, let in exhaust gas in the EGR cooler through the interface, carry out heat exchange through the coolant liquid in the EGR cooler and the exhaust gas of high temperature and cool off exhaust gas to reduce the temperature of combustion chamber, improve engine work efficiency and improve the combustion emission.

The exhaust gas of the natural gas engine contains a lot of water vapor, condensed water is easily formed after cooling, and the condensed water enters the engine to cause non-uniformity of EGR rate of each cylinder, abrasion and corrosion of coupling parts and the like.

Disclosure of Invention

The utility model discloses easily form the comdenstion water behind the exhaust cooling to present natural gas engine and lead to wearing and tearing, the corruption scheduling problem of the inhomogeneity and the coupling piece of each jar EGR rate, provide a natural gas engine EGR cooler.

In order to achieve the above object, the present invention firstly provides a natural gas engine EGR cooler, which comprises a housing, a core and a condensation plate, wherein the core is internally provided with flowing cooling water, and the core and the condensation plate are sequentially arranged in the housing from top to bottom; the shell is provided with an air inlet, an air outlet, a water inlet and a water outlet, and the cooling water enters the core body from the water inlet and flows out of the water outlet; waste gas enters the shell through the air inlet and then sequentially passes through the core body and the condensation plate and is discharged from the air outlet. Waste gas gets into the casing from the air inlet and at first passes through the core, and constantly there is cooling water to flow through in the core, and cooling water constantly takes away the temperature of waste gas, and waste gas can cool off the cooling, and waste gas can separate out partial water simultaneously, and the partial water that separates out flows to the casing bottom, and the waste gas after obtaining cooling continues downstream and passes through the condensation plate, and tiny liquid drop that smugglies secretly in the waste gas can assemble on the condensation plate and form great liquid drop, and these great liquid drops flow to aqua storage tank casing bottom equally after assembling again. The waste gas is discharged out of the shell after passing through the core body and the condensation plate, most water in the waste gas is separated out at the moment, the condensed water is greatly reduced, and the problems of non-uniformity of EGR rate of each cylinder, abrasion, corrosion and the like of coupling pieces can be avoided.

Preferably, a water-gas separation channel in the vertical direction is arranged in the shell, the gas outlet is positioned at the end part of the water-gas separation channel, and waste gas passing through the condensation plate moves upwards along the water-gas separation channel and is discharged through the gas outlet. Still have remaining tiny water droplet in the waste gas behind the condensing panel, waste gas along the in-process of aqueous vapor separation passageway upward movement, remaining water droplet in the waste gas is in the casing by the downstream under the effect of gravity, and the air current then lasts upward movement and through gas outlet discharge casing to reach the effect of aqueous vapor separation.

Preferably, a water storage tank is arranged at the bottom of the shell, and a water discharge opening is formed in the bottom of the water storage tank. The water flowing down from the core body and the condensing plate can be gathered and enter the water storage tank under the action of gravity.

Preferably, a water drain valve is arranged at the water drain opening, and an automatic water drain mechanism is arranged in the water drain valve. When the water level in the water storage tank reaches a certain height, an automatic water discharging mechanism in the water discharging valve is triggered to open the valve under the action of water pressure to realize the water discharging function.

Preferably, the condensing plate includes first condensing plate and second condensing plate, first condensing plate level set up in the casing, the one end of second condensing plate with first condensing plate is connected, and the other end slope is upwards and is fixed in the inner wall of casing, just the second condensing plate is located water gas separation channel's below. The arrangement mode of the first condensation plate and the second condensation plate accords with the movement path of the waste gas, the contact area of the waste gas and the condensation plates can be increased to the maximum extent, and the condensation effect can reach the best.

Preferably, a fixing support is arranged on the outer side of the shell, and a fixing hole is formed in one extending end of the fixing support. The EGR cooler of the natural gas engine is fixed on the engine cylinder body through the fixing support and the fixing hole.

Preferably, the fixing bracket is provided in plurality.

Preferably, the core is provided in a cuboid structure. The core body adopts a short square structure, so that the resistance loss of waste gas during passing can be greatly reduced, and the efficiency is improved.

Preferably, a plurality of accessory fixing holes are formed in the outer side of the housing. The accessory fixing hole is used for fixing other accessories of the engine.

The utility model has the advantages that: this natural gas engine EGR cooler can reduce the pressure drop of waste gas flow through the EGR cooler, and the casing is inside to be provided with core and condenser plate, can separate out a large amount of moisture in the EGR gas, is favorable to the security and the stability of engine operation.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description 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 it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of an EGR cooler of a natural gas engine according to the present invention.

Fig. 2 is a perspective view of the EGR cooler of the natural gas engine according to the present invention.

In the figure: 1. the EGR cooler comprises a natural gas engine EGR cooler, 2, a shell, 3, a core body, 4, a condensing plate, 5, an air inlet, 6, an air outlet, 7, a water inlet, 8, a water outlet, 9, a water storage tank, 10, a water outlet, 11, a water drain valve, 12, a water-gas separation channel, 13, a first condensing plate, 14, a second condensing plate, 15, a fixed support, 16, a fixed hole, 17 and an accessory fixing hole.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.

As shown in fig. 1 and fig. 2, in the present embodiment, the present invention firstly provides a natural gas engine EGR cooler 1, the natural gas engine EGR cooler 1 includes a housing 2, a core 3 and a condensation plate 4, flowing cooling water is provided in the core 3, and the core 3 and the condensation plate 4 are sequentially disposed in the housing 2 from top to bottom; the shell 2 is provided with an air inlet 5, an air outlet 6, a water inlet 7 and a water outlet 8, the bottom of the shell 2 is provided with a water storage tank 9, and the bottom of the water storage tank 9 is provided with a water outlet 10. Cooling water enters the core body 3 from the water inlet 7 and flows out from the water outlet 8; waste gas enters the shell 2 through the gas inlet 5, passes through the core 3 and the condensation plate 4 in sequence and is discharged from the gas outlet 6. Waste gas enters the shell 2 from the air inlet 5 and firstly passes through the core body 3, cooling water continuously flows through the core body 3, the cooling water continuously takes away the temperature of the waste gas, the waste gas is cooled, part of water is separated out from the waste gas, and the separated part of water flows to the bottom of the shell 2 under the action of gravity and is gathered to enter the water storage tank 9; the cooled and cooled waste gas continues to move downwards to pass through the condensation plate 4, fine liquid drops carried in the waste gas are converged on the condensation plate 4 to form larger liquid drops, and the larger liquid drops are converged and then flow to the water storage tank 9 at the bottom of the shell 2. And the water outlet 10 of the bottom of the water storage tank 9 is provided with a water discharge valve 11, an automatic water discharge mechanism is arranged in the water discharge valve 11, when the water level in the water storage tank 9 reaches a certain height, the automatic water discharge mechanism in the water discharge valve 11 is triggered under the action of water pressure, so that the function of discharging water is realized by opening the valve. The waste gas is discharged out of the shell 2 after passing through the core body 3 and the condensing plate 4, most of water in the waste gas is separated out at the moment, the condensed water is greatly reduced, and the problems of non-uniformity of EGR rate of each cylinder, abrasion, corrosion and the like of a coupling piece can be avoided.

The core 3 is set to be a short square structure in the embodiment, so that the resistance loss when the waste gas passes through is greatly reduced, and the efficiency is improved.

In order to further separate the liquid drops contained in the exhaust gas, in this embodiment, a vertical water-gas separation channel 12 is further disposed in the housing 2, the gas outlet 6 is located at an end of the water-gas separation channel 12, and the exhaust gas passing through the condensation plate 4 moves upward along the water-gas separation channel 12 and is discharged through the gas outlet 6. Residual fine water drops still exist in the waste gas passing through the condensing plate 4, in the process that the waste gas moves upwards along the water-gas separation channel 12, the residual water drops in the waste gas move downwards under the action of gravity and are remained in the shell 2, and the air flow continuously moves upwards and is discharged out of the shell 2 through the air outlet 6, so that the effect of water-gas separation is achieved.

As shown in fig. 1 and 2, the condensation plate 4 includes a first condensation plate 13 and a second condensation plate 14, the first condensation plate 13 is horizontally disposed in the housing 2, one end of the second condensation plate 14 is connected to the first condensation plate 13, the other end of the second condensation plate 14 is inclined upward and fixed on the inner wall of the housing 2, and the second condensation plate 14 is located below the water-gas separation channel 12. The arrangement of the first condensation plate 13 and the second condensation plate 14 conforms to the movement path of the exhaust gas, so that the contact area between the exhaust gas and the condensation plate 4 can be increased to the maximum extent, and the condensation effect can be optimal.

In order to fix the natural gas engine EGR cooler 1 on the engine conveniently, a fixing support 15 is arranged on the outer side of the shell 2, and a fixing hole 16 is formed in the extending end of the fixing support 15. The cooler 1 can be fixed to the engine block by means of the fixing bracket 15 and the fixing hole 16. The number and the specific position of the fixing brackets 15 can be flexibly set according to actual conditions, and in the embodiment, the fixing brackets 15 are four and distributed on two opposite sides of the shell 2.

Meanwhile, a plurality of accessory fixing holes 17 are formed in the outer side of the housing 2 for fixing other accessories of the engine.

The working principle of the land leveler is as follows: waste gas enters the shell 2 from the air inlet 5 and firstly passes through the core body 3, cooling water continuously flows through the core body 3, the cooling water continuously takes away the temperature of the waste gas, the waste gas is cooled, part of water is separated out from the waste gas, and the separated part of water flows to the water storage tank 9 at the bottom of the shell 2; the cooled and cooled waste gas continuously moves downwards and passes through the condensation plate 4, fine liquid drops carried in the waste gas are converged on the condensation plate 4 to form larger liquid drops, and the larger liquid drops are converged and then flow to the water storage tank 9; after passing through the core 3 and the condensing plate 4, the exhaust gas moves upward along the water-gas separation channel 12 and is discharged through the air outlet 6. Residual fine water drops still exist in the waste gas passing through the condensing plate 4, in the process that the waste gas moves upwards along the water-gas separation channel 12, the residual water drops in the waste gas move downwards under the action of gravity and are remained in the shell 2, and the air flow continuously moves upwards and is discharged out of the shell 2 through the air outlet 6, so that the effect of water-gas separation is achieved.

The utility model has the advantages that: this natural gas engine EGR cooler 1 can reduce the pressure drop of waste gas flow through the EGR cooler, and casing 2 is inside to be provided with core 3 and condenser plate 4, can separate out a large amount of moisture in the EGR gas, is favorable to the security 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 EGR cooler for the natural gas engine is characterized by comprising a shell, a core body and a condensation plate, wherein flowing cooling water is arranged in the core body, and the core body and the condensation plate are sequentially arranged in the shell from top to bottom; the shell is provided with an air inlet, an air outlet, a water inlet and a water outlet, and the cooling water enters the core body from the water inlet and flows out of the water outlet; waste gas enters the shell through the air inlet and then sequentially passes through the core body and the condensation plate and is discharged from the air outlet.

2. The natural gas engine EGR cooler of claim 1 wherein a vertically oriented water-gas separation channel is provided in the housing, the air outlet is located at an end of the water-gas separation channel, and exhaust gas passing through the condensation plate moves up the water-gas separation channel and is discharged through the air outlet.

3. The natural gas engine EGR cooler as recited in claim 1, wherein a water storage tank is provided at a bottom of the housing, and a water discharge outlet is provided at a bottom of the water storage tank.

4. The natural gas engine EGR cooler as recited in claim 3, characterized in that a water drain valve is provided at the water drain, and an automatic water-proof mechanism is provided in the water drain valve.

5. The natural gas engine EGR cooler of claim 2 wherein the condensation plates comprise a first condensation plate and a second condensation plate, the first condensation plate is horizontally disposed in the housing, one end of the second condensation plate is connected to the first condensation plate, the other end of the second condensation plate is inclined upward and fixed to the inner wall of the housing, and the second condensation plate is located below the water-gas separation channel.

6. The natural gas engine EGR cooler as defined in claim 1, wherein a fixing bracket is provided outside the housing, and a fixing hole is opened at an extending end of the fixing bracket.

7. The natural gas engine EGR cooler of claim 6, wherein the fixing bracket is provided in plurality.

8. The natural gas engine EGR cooler of claim 1 wherein the core is provided as a cuboid structure.

9. The natural gas engine EGR cooler of claim 1 wherein the outside of the housing is provided with a plurality of accessory fixing holes.