EGR (Exhaust Gas Recirculation) with adjustable water side pressure drop structure

Abstract

The utility model provides an EGR (Exhaust Gas Recirculation) with an adjustable water side pressure drop structure, which comprises an integrated gas outlet cover arranged on one side of an EGR shell, a hollow heat exchange cavity formed by peripheral side walls of the EGR shell, and integrated gas inlet flanges arranged on the other side of the EGR shell, a pair of gas inlet flanges are arranged, and the gas inlet flanges are connected with the gas outlet cover through heat exchange pipes; the exhaust port is formed in the side, close to the gas outlet cover, of the bottom of the EGR shell in a penetrating mode, and the exhaust port is L-shaped; the exhaust hood is arranged in the EGR shell, the exhaust hood is arranged in the exhaust hood, the water outlet hole is arranged in the front side or the rear side of one side, close to the exhaust hood, of the EGR shell, a water outlet connecting pipe is clamped in the center of the water outlet hole, and the water outlet connecting pipe is connected with the EGR shell through welding. The inner diameter of the water outlet connecting pipe and the inner diameter of the water outlet side of the EGR can be simply adjusted according to a system specifically used by the EGR and the cooling special flow speed of the system, the pressure drop of the water side of the EGR can be changed, and the EGR can reach the most ideal state.

Description

Technical Field

[0001] This utility model relates to the field of engine EGR (exhaust gas recirculation), and in particular to the field of EGR cooler technology, specifically an EGR with an adjustable water-side pressure drop structure. Background Technology

[0002] In the design of many engines in China, the use of parallel water circuit connection is crucial. This layout is mainly to effectively improve the efficiency and reliability of the cooling system. The parallel connection allows the cooling water to flow in multiple paths at the same time, thereby ensuring that all parts of the engine can be cooled evenly and efficiently, avoiding local overheating and ensuring the stable operation of the engine.

[0003] Among these factors, the water-side pressure drop of the Exhaust Gas Recirculation (EGR / C) system is a critical factor that requires special attention. The EGR / C system cools the exhaust gas to reduce its temperature before introducing it into the engine intake system to reduce nitrogen oxide emissions. The magnitude of the water-side pressure drop in this system directly affects the flow resistance of the coolant, which in turn significantly impacts the heat exchange efficiency of other engine components. If the EGR / C water-side pressure drop is too large, the coolant flow in the system will be obstructed, and the flow rate will decrease, thereby reducing the coolant's ability to carry away heat. This will not only affect the cooling effect of the EGR / C system itself, preventing the exhaust gas temperature from being effectively reduced, but may also cause a reduction in coolant flow to other engine components such as the turbocharger and intercooler, resulting in decreased heat exchange efficiency. Over time, this may lead to overheating of these components, accelerated aging, or even malfunctions, threatening the overall performance and lifespan of the engine. If the EGR water-side pressure drop is too small, the coolant flow rate will also be low, resulting in poor cooling and thus increasing exhaust emissions. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an EGR with an adjustable water-side pressure drop structure to solve the difficulties of the prior art.

[0005] To achieve the above and other related objectives, this utility model provides an EGR with an adjustable water-side pressure drop structure, comprising:

[0006] EGR housing 1, with an integral exhaust hood 12 on one side, the EGR housing 1 having a hollow heat exchange chamber formed by four side walls, and an integral intake flange 11 on the other side, the intake flange 11 having a pair, the pair of intake flanges 11 being connected to the exhaust hood 12 via heat exchange pipes.

[0007] Vent 5, the vent 5 is provided at the bottom of the EGR housing 1 on the side near the vent shroud 12, the vent 5 is L-shaped;

[0008] Water inlet 2 is located on one side of air inlet flange 11. The bottom of water inlet 2 is connected to the heat exchange chamber, but the water inlet 2 is not connected to air inlet flange 11.

[0009] Water outlet 3 is located on the front or rear side of the EGR housing 1 near the vent 12. A water outlet connecting pipe 4 is installed in the center of the water outlet 3. The water outlet connecting pipe 4 is connected to the EGR housing 1 by welding.

[0010] According to the preferred embodiment, the outer wall of the outlet connecting pipe 4 is provided with mounting grooves 41 at equal intervals.

[0011] According to the preferred embodiment, the bottom of the outlet connecting pipe 4 is provided with a boss 42, the boss 42 is locked in the outlet hole 3, and the bottom of the outlet connecting pipe 4 is connected to the outlet hole 3 by welding.

[0012] According to the preferred embodiment, the outlet connecting pipe 4 has an outlet channel 43 in the center, an outlet protrusion 432 is provided on the inner side wall of the top of the outlet channel 43, and an inner chamfer 431 is provided on the inner side wall of the bottom of the outlet connecting pipe 4.

[0013] According to the preferred embodiment, the inner diameter of the water outlet channel 43 is 30mm, and the inner diameter of the water outlet boss 432 can be freely selected between 22mm and 30mm.

[0014] This utility model adopts an EGR shell, an air vent, a water outlet, and a water outlet connecting pipe. A water outlet boss is set on the water outlet connecting pipe. The inner diameter of the water outlet connecting pipe can be adjusted according to the specific system in which the EGR is used and the cooling characteristics of the system. This can change the water-side pressure drop of the EGR and make the EGR reach the most ideal state.

[0015] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, so as to facilitate an understanding of the features and advantages of the present invention. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0017] Figure 2 The diagram shown is a cross-sectional view of the present invention with the outlet connecting pipe installed on the EGR housing.

[0018] Figure 3 This invention relates to the pressure drop of coolant at three different flow rates within the outlet bosses of varying inner diameters; (Reference symbol explanation)

[0019] 1. EGR housing; 11. Inlet flange; 12. Exit hood;

[0020] 2. Water inlet;

[0021] 3. Water outlet;

[0022] 4. Outlet connecting pipe; 41. Assembly groove; 42. Boss; 43. Outlet channel; 431. Inner chamfer; 432. Outlet boss;

[0023] 5. Vent; Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this utility model may have fewer components, have other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components shown in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0026] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0027] This invention proposes an EGR with an adjustable water-side pressure drop structure for use in the improved design process of the EGR cooler outlet water side. This invention does not limit the specific specifications of the EGR to be improved, but the structure of the water outlet 3, the water outlet connecting pipe 4, and the water outlet boss 432 is particularly suitable for water-side pressure reduction in EGR coolers.

[0028] In general, the EGR with adjustable water-side pressure drop structure proposed in this utility model mainly includes: EGR housing 1, vent 5, water outlet 3, and water outlet connecting pipe 4. (See also...) Figure 1 It shows the arrangement of the EGR housing 1, the vent 5, the water outlet 3, and the water outlet connecting pipe 4.

[0029] The EGR with an adjustable water-side pressure drop structure proposed in this utility model has an outlet boss 432 on the outlet connecting pipe 4. The inner diameter of the outlet side of the EGR's outlet connecting pipe 4 can be adjusted relatively simply according to the specific system in which the EGR is used and the cooling characteristics of that system. Specific adjustment methods include:

[0030] 1. Replace the outlet connecting pipe 4 with the corresponding outlet boss 432 inner diameter before EGR welding;

[0031] 2. Enlarge the hole of the outlet boss 432 in the outlet connecting pipe 4.

[0032] The above methods can be used to change the water-side pressure drop of the EGR, allowing the EGR to reach its optimal state.

[0033] You can refer to this. Figure 2 The table shows the pressure drop and water resistance parameters for different test conditions: exhaust gas at a flow rate of 7.57 kg / min and a temperature of 760°C is introduced into the inlet flange 11; LLC coolant at a temperature of 90°C is introduced into the heat exchange chamber from the vent; and the flow rates are 100 L / min, 78 L / min, and 58.3 L / min, respectively, within a range of 22 mm to 30 mm.

[0034] The EGR housing 1 has an integral exhaust hood 12 on one side. The EGR housing 1 is a hollow heat exchange chamber formed by four side walls. The other side of the EGR housing 1 has an integral intake flange 11. There is a pair of intake flanges 11, which are connected to the exhaust hood 12 through heat exchange pipes. When the EGR is working, the intake flanges 11 receive high-temperature exhaust gas from the left and right chambers of the engine and collect the high-temperature exhaust gas into the heat exchange pipes. After the high-temperature gas exchanges heat with the LLC coolant in the heat exchange chamber through the heat exchange pipes, the cooled high-temperature exhaust gas enters the exhaust hood 12. The cooled exhaust gas is then transported back to the engine combustion chamber through the gas pipe connected to the exhaust hood 12. It should also be noted that the vent 5 is located at the bottom of the EGR housing 1 near the exhaust hood 12. The vent 5 is L-shaped. When the EGR is actually installed, the vent 5 will be located at the top. The function of the vent 5 is to discharge the gas in the heat exchange chamber and prevent dry burning in the EGR heat exchange chamber.

[0035] The aforementioned water outlet 3 is located on the front or rear side of the EGR housing 1 near the exhaust hood 12. A water outlet connecting pipe 4 is fitted in the center of the water outlet 3. The water outlet connecting pipe 4 is connected to the EGR housing 1 by welding. The outer wall of the water outlet connecting pipe 4 is provided with mounting grooves 41 at equal intervals, which, together with the water pipe connected to the water tank, form a labyrinth structure to achieve a sealing effect. A boss 42 is provided at the bottom of the water outlet connecting pipe 4, which is fitted into the water outlet 3. The bottom of the water outlet connecting pipe 4 is connected to the water outlet 3 by welding. The center of the water outlet connecting pipe 4 is the water outlet channel 43. A water outlet boss 432 is provided on the inner wall of the top of the water outlet channel 43. An inner chamfer 431 is provided on the inner wall of the bottom of the water outlet connecting pipe 4. The inner diameter of the center of the water outlet channel 43 is 30mm. The inner diameter of the water outlet boss 432 can be freely selected between 22mm and 30mm.

[0036] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An EGR with an adjustable water-side pressure drop structure, characterized in that, include: EGR housing (1), one side of which is provided with an integral exhaust hood (12), the EGR housing (1) is composed of a hollow heat exchange cavity formed by four side walls, and the other side of the EGR housing (1) is an integral air inlet flange (11), a pair of air inlet flanges (11) are provided, and the pair of air inlet flanges (11) are connected to the exhaust hood (12) through heat exchange pipes; Vent (5), the vent (5) is installed at the bottom of the EGR housing (1) on the side near the vent hood (12), and the vent (5) is L-shaped; Water inlet (2), the water inlet (2) is located on one side of the air inlet flange (11), the bottom of the water inlet (2) is connected to the heat exchange chamber, and the water inlet (2) is not connected to the air inlet flange (11); Water outlet (3) is located on the front or rear side of the EGR housing (1) near the air vent (12). A water outlet connecting pipe (4) is installed in the center of the water outlet (3). The water outlet connecting pipe (4) is connected to the EGR housing (1) by welding.

2. The EGR with an adjustable water-side pressure drop structure according to claim 1, characterized in that, The outlet connecting pipe (4) has mounting grooves (41) at equal intervals on its outer wall.

3. The EGR with an adjustable water-side pressure drop structure according to claim 2, characterized in that, The bottom of the outlet connecting pipe (4) is provided with a boss (42), which is fitted into the outlet hole (3). The bottom of the outlet connecting pipe (4) is connected to the outlet hole (3) by welding.

4. The EGR with an adjustable water-side pressure drop structure according to claim 3, characterized in that, The outlet connecting pipe (4) has an outlet channel (43) in the center. An outlet boss (432) is provided on the inner side wall of the top of the outlet channel (43), and an inner chamfer (431) is provided on the inner side wall of the bottom of the outlet connecting pipe (4).

5. The EGR with an adjustable water-side pressure drop structure according to claim 4, characterized in that, The inner diameter of the water outlet channel (43) is 30mm, and the inner diameter of the water outlet boss (432) can be freely selected between 22mm and 30mm.

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