EGR (Exhaust Gas Recirculation) system for preventing spalling of EGR cooler of gas engine of heavy vehicle

Abstract

The utility model discloses an EGR (exhaust gas recirculation) system for preventing an EGR cooler of a heavy-duty vehicle gas engine from freezing and spalling, which comprises an EGR valve and an EGR cooler, one end of the EGR cooler is connected with the EGR valve through a first cooler connecting pipe, and a cooler chip chamber in the EGR cooler is provided with an obliquely arranged cooler chip; the system further comprises a storage chamber, the other end of the EGR cooler is connected with the storage chamber, and the other end of the storage chamber is connected with a second cooler connecting pipe. And the horizontal height of the lowest point of the storage chamber is lower than that of the lowest point of the EGR cooler chip chamber. The utility model has the advantages that the structure is simple, the water accumulation amount of the chip chamber is reduced, and the bursting of the cooler chip is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to EGR technical field, especially prevent heavy -duty vehicle gas engine EGR cooler burst EGR system of using gas. BACKGROUND

[0002] The exhaust gas produced by the heavy -duty vehicle gas engine that adopts the cooling EGR technical route burns natural gas and contains a large amount of moisture, under low temperature environment, such as long time idling, or frequently repeated start / stop working condition, after the engine stops, the condensate water in the EGR cooler will be precipitated due to temperature drop. The traditional design method has the following problems:

[0003] Condensate water icing burst under low temperature environment: the disposal of condensate water is not considered and the space allowing condensate water to freeze and expand is not set in advance, so that the repeatedly accumulated condensate water expands in volume after icing, and the EGR cooler inner core is burst, causing the damage of EGR cooler.

[0004] The prior art document CN210660366U discloses an EGR cooler convenient for degassing, which is arranged by tilting the heat dissipation chip, so that the bubbles generated by high-temperature boiling are quickly separated from the heat exchange surface under the double action of the bubble itself buoyancy and the cooling liquid flow, to prevent the formation of gas film on the heat exchange surface and reduce the heat dissipation performance. The cooling liquid outlet and the cooling liquid inlet are arranged at the bottom of the cooling cavity, so that the cooling liquid can be completely drained, so that the EGR cooler is not damaged due to freezing of the cooling liquid. The present application proposes another arrangement scheme of the EGR cooler.

[0005] The disclosure of the above background art content is only used to assist in understanding the concept and technical scheme of the utility model, and it does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background technology should not be used to evaluate the novelty and inventiveness of the present application. UTILITY MODEL CONTENT

[0006] The utility model mainly aims at providing an EGR system with simple structure, reduced water accumulation in the chip chamber and reduced burst of the cooler chip.

[0007] Therefore, the utility model provides an EGR system for preventing the icing and burst of the EGR cooler of the heavy -duty vehicle gas engine.

[0008] Preferably, the utility model can also have the following technical features:

[0009] The application discloses an EGR system for preventing EGR cooler of a heavy-duty gas engine from cracking due to icing, which comprises an EGR valve, an EGR cooler, a first cooler connecting pipe, a cooler chip chamber, a storage chamber, a second cooler connecting pipe and a stepped hole structure.

[0010] Further, the storage chamber and the EGR cooler are integrated and coaxial.

[0011] Further, the storage chamber and the EGR cooler are integrated and coaxial.

[0012] Further, the storage chamber and the EGR cooler are integrated and coaxial.

[0013] Further, the storage chamber and the EGR cooler are integrated and coaxial.

[0014] Further, the storage chamber and the EGR cooler are integrated and coaxial.

[0015] Further, the storage chamber and the EGR cooler are integrated and coaxial.

[0016] Further, the storage chamber and the EGR cooler are integrated and coaxial.

[0017] Further, the storage chamber and the EGR cooler are integrated and coaxial.

[0018] The application has the beneficial effects that: the storage chamber is arranged to store the condensed water separated from the EGR cooler, the storage amount of the condensed water in the cooler chip chamber is reduced, and the risk of the condensed water icing and cracking the EGR cooler chip is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the application.

[0020] Figure 2 is a schematic view of the installation position of the perforation of the application.

[0021] MARKS OF THE DRAWINGS:

[0022] 1 - second cooler connection pipe; 2 - accumulation chamber; 3 - chip chamber; 4 - cooler chip; 5 - first cooler connection pipe; 6 - EGR valve. DETAILED DESCRIPTION

[0023] The utility model will be explained in further detail below in conjunction with the specific embodiments and with reference to the drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the utility model and its applications.

[0024] With reference to the following drawings, non-limiting and non-exclusive embodiments will be described, in which the same reference numerals indicate the same parts, unless otherwise specifically indicated.

[0025] As Figure 1 shown in the EGR system for preventing the EGR cooler of heavy-duty gas engine from freezing and cracking, comprising an EGR valve 6, an EGR cooler, one end of the EGR cooler is connected to the EGR valve 6 through a first cooler connection pipe 5, and the EGR cooler is internally provided with a cooler chip 4 arranged obliquely; further comprising an accumulation chamber 2, the other end of the EGR cooler is connected to the accumulation chamber 2, and the other end of the accumulation chamber 2 is connected to a second cooler connection pipe 1; the lowest point of the accumulation chamber 2 is lower than the lowest point of an EGR cooler chip chamber 3. Preferably, the inside of the accumulation chamber 2 is provided with an inner cavity, the inner cavity and a chip chamber 3 in which the cooler chip 4 is installed in the EGR cooler are communicated, so that the accumulation chamber 2 and the EGR cooler are integrated and coaxial. The inside of the accumulation chamber 2 and the EGR cooler forms a stepped hole structure. In this way, by setting the accumulation chamber 2 to accommodate the condensed water discharged from the EGR cooler chip chamber 3, the amount of condensed water accumulated in the EGR cooler chip chamber 3 is reduced, and the risk of condensed water freezing and cracking the EGR cooler chip 4 is reduced. Preferably, the length of the accumulation chamber 2 is 1 / 7 to 1 / 6 of the length of the EGR cooler.

[0026] Preferably, the lowest point of the accumulation chamber 2 is more than 3 mm lower than the lowest point of the EGR cooler chip chamber 3. This is conducive to improving the role of the accumulation chamber 2 in accumulating condensed water and reducing the amount of water accumulated in the EGR cooler chip chamber 3. When the vehicle is running again, as the exhaust gas temperature rises, the condensed water accumulated in the accumulation chamber 2 is vaporized by the high-temperature exhaust gas and is discharged from the accumulation chamber 2 with the exhaust gas.

[0027] The first cooler connection pipe 5, the second cooler connection pipe 1, the accumulation chamber 2 and the EGR cooler are coaxial. And the pipe diameter and model of the first cooler connection pipe 5 and the second cooler connection pipe 1 are the same.

[0028] When the condensed water is precipitated, the condensed water is guided to the low point of the chip inside the cooler by the inclined chip design, and is usually stored at the low point of the chip. There is not enough space to set the storage space at the connection between the EGR cooler and the EGR valve 6, and at the same time, in order to protect the EGR valve 6 from the impact of the condensed water, the high point of the cooler chip 4 is arranged at one end close to the EGR valve, and the low point is arranged at one end close to the storage chamber 2, which is also conducive to the condensed water converging to the storage chamber 2. Generally, the engine and the vehicle are at an angle of 3-5° with the horizontal line, and further considering that the ground inclination of the heavy vehicle when parked is generally not greater than 5°, therefore, the preferred arrangement of the cooler chip 4 is inclined at an angle of 10-15°, and the said inclined angle is the angle between the cooler chip 4 and the horizontal plane.

[0029] Preferably, the cooling chip 4 is provided with a perforation at a distance of 3-5 mm from the lowest point of the chip chamber 3, and the diameter of the perforation is 5-7 mm. More preferably, the height of the perforation is flush with the lowest point of the inner cavity of the first cooler connecting pipe 5, such as Figure 2 , the perforation is arranged at the height of the dashed line in Figure 2 . By providing the perforation in the cooling chip 4, when the condensed water accumulated in the chip chamber 3 freezes, it can flow through the perforation to prevent local volume expansion.

[0030] Those skilled in the art will appreciate that numerous variations are possible from the foregoing description, and therefore the embodiments and the drawings are merely illustrative of one or more particular embodiments.

[0031] Although the exemplary embodiments of the present application have been described and illustrated, it will be understood by those skilled in the art that various changes, modifications and substitutions can be made therein without departing from the spirit and scope of the present application. In addition, many modifications can be made to adapt a particular situation to the teachings of the present application without departing from the central concept of the present application described herein. Accordingly, the present application is not limited to the specific embodiments disclosed herein but includes all embodiments falling within the scope of the present application and their equivalents.

Claims

1. An EGR system for preventing the EGR cooler of a heavy-duty vehicle gas engine from freezing and cracking, comprising an EGR valve and an EGR cooler, wherein one end of the EGR cooler is connected to the EGR valve via a first cooler connector, and the cooler chip chamber inside the EGR cooler is provided with inclined cooler chips; characterized in that: The EGR cooler is connected to a storage chamber at one end, and the other end of the storage chamber is connected to a second cooler connecting pipe; the lowest point of the storage chamber is lower than the lowest point of the EGR cooler core chamber.

2. The EGR system for preventing the EGR cooler of the gas engine for heavy-duty vehicles from freezing and cracking according to claim 1, characterized in that: The storage chamber and the EGR cooler are integrated and coaxial.

3. The EGR system to prevent the EGR cooler of a gas engine for heavy-duty vehicles from ice-cracking according to claim 2, characterized in that: The storage chamber and the EGR cooler form a stepped hole structure.

4. The EGR system to prevent the EGR cooler of a gas engine for heavy duty vehicles from ice-cracking according to claim 2, characterized in that: The lowest point of the storage chamber is more than 3mm lower than the lowest point of the EGR cooler core chamber.

5. The EGR system to prevent ice-cracking of an EGR cooler of a gas engine of a heavy-duty vehicle according to claim 1, characterized in that: The first cooler connecting pipe, the second cooler connecting pipe, the storage chamber and the EGR cooler are coaxial.

6. The EGR system to prevent ice-cracking of an EGR cooler of a gas engine of a heavy-duty vehicle according to claim 1, characterized in that: The inclination angle of the cooler core is 10-15°.

7. The EGR system to prevent ice-cracking of an EGR cooler of a gas engine of a heavy-duty vehicle according to claim 1, characterized in that: The cooler core is provided with a perforation at a distance of 3-5mm from the lowest point of the core chamber.

8. The EGR system to prevent ice-cracking of an EGR cooler of a gas engine of a heavy-duty vehicle according to claim 7, characterized in that: The diameter of the perforation is 5-7mm.

9. The EGR system to prevent ice-cracking of an EGR cooler of a gas engine of a heavy-duty vehicle according to claim 7, characterized in that: The height of the perforation is flush with the lowest point of the inner cavity of the first cooler connecting pipe.

10. The EGR system to prevent ice-cracking of an EGR cooler of a gas engine of a heavy-duty vehicle according to claim 7, characterized in that: The high point of the inclined cooler core is arranged at one end close to the EGR valve, and the low point is arranged at one end close to the storage chamber.

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