Flow path structure for internal combustion engine

Abstract

The utility model provides a flow path structure for an internal combustion engine. The flow path structure can restrain an exhaust gas recirculation gas channel from generating condensate water. A flow path structure for an internal combustion engine includes: a channel body provided on a side surface of the internal combustion engine and connected to a water jacket inside the internal combustion engine; the cooling water channel is arranged in the horizontal direction, and the channel body is connected to the radiator through the cooling water channel; a catalyst device connected to the internal combustion engine; the air inlet device is connected to the internal combustion engine; the exhaust gas recirculation device comprises a water-cooled heat exchanger and a return valve, and the water-cooled heat exchanger and the return valve are connected to the catalyst device and the gas inlet device; an exhaust gas recirculation gas passage connected to the downstream end of the return valve and connected to the intake device; and a heat exchanger return passage connected to the water-cooled heat exchanger, the exhaust gas recirculation gas passage and the heat exchanger return passage being provided along the cooling water passage, the cooling water passage, the exhaust gas recirculation gas passage, and the heat exchanger return passage being integrally formed in the passage body.

Description

Technical Field

[0001] The utility model relates to a local structure of an internal combustion engine, and in particular to a flow path structure used for the internal combustion engine. Background Art

[0002] In recent years, research and development efforts to improve fuel efficiency, which contributes to energy efficiency, have been underway to ensure access to affordable, reliable, sustainable, and advanced energy for a wider audience. However, in developing vehicles to improve fuel efficiency, internal combustion engines equipped with water-cooled exhaust gas recirculation (EGR) coolers often experience low temperatures in the EGR gas passages, which can easily lead to the formation of condensed water. This condensed water flowing into components such as the EGR valve can cause corrosion, hindering fuel efficiency. Therefore, improvements to the flow path structure used in internal combustion engines are necessary to overcome this problem. Utility Model Content

[0003] The utility model provides a flow path structure for an internal combustion engine, which can suppress the generation of condensed water in an exhaust gas recirculation gas channel.

[0004] The utility model provides a flow path structure for an internal combustion engine, comprising: a channel body, arranged on the side of the internal combustion engine and connected to a water jacket in the internal combustion engine; a cooling water channel, arranged in a horizontal direction, and the channel body is connected to a radiator through the cooling water channel; a catalyst device, connected to the internal combustion engine; an intake device, connected to the internal combustion engine; an exhaust gas recirculation device, comprising a water-cooled heat exchanger and a return valve, the water-cooled heat exchanger and the return valve being connected to the catalyst device and the intake device; an exhaust gas recirculation gas channel, connected to the downstream end of the return valve and connected to the intake device; and a heat exchanger return channel, connected to the water-cooled heat exchanger, the exhaust gas recirculation gas channel and the heat exchanger return channel being arranged along the cooling water channel, and the cooling water channel, the exhaust gas recirculation gas channel and the heat exchanger return channel being integrally formed in the channel body.

[0005] In an embodiment of the present invention, the cooling water channel, the exhaust gas recirculation channel, and the heat exchanger return channel have the same flow direction.

[0006] In an embodiment of the present invention, the cooling water channel and the heat exchanger return channel partially cover the exhaust gas recirculation gas channel.

[0007] In an embodiment of the present utility model, the internal combustion engine is a V-type internal combustion engine and includes a dormant side cylinder bank and a conventional side cylinder bank. The dormant side channel body in the channel body and the conventional side channel body in the channel body are respectively connected to the dormant side cylinder bank and the conventional side cylinder bank, and the exhaust gas recirculation gas channel is arranged in the conventional side channel body.

[0008] Based on the above, in the flow path structure for an internal combustion engine of the present invention, the cooling water channel, the exhaust gas recirculation channel, and the heat exchanger return channel are all disposed within the channel body, with the exhaust gas recirculation channel and the heat exchanger return channel arranged alongside the cooling water channel. Consequently, the cooling water channel, the exhaust gas recirculation channel, and the heat exchanger return channel are adjacent to each other, and the high-temperature water flowing through the cooling water channel and the heat exchanger return channel can provide thermal insulation for the gas in the exhaust gas recirculation channel. Consequently, the flow path structure for an internal combustion engine of the present invention can suppress the formation of condensed water in the exhaust gas recirculation channel.

[0009] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a partial schematic diagram of an internal combustion engine according to an embodiment of the present utility model;

[0011] Figure 2 yes Figure 1 Schematic diagram of the cooling water circuit of some components of an internal combustion engine;

[0012] Figure 3 yes Figure 1 A three-dimensional diagram of some components of the flow path structure;

[0013] Figure 4 Show Figure 3 The local structure of the flow path structure;

[0014] Figure 5 yes Figure 4 A top view of the flow path structure;

[0015] Figure 6 Show Figure 5 The local structure of the cooling water channel, the gas recirculation channel and the heat exchanger channel;

[0016] Figure 7 yes Figure 6 A perspective view of the cooling water channel, the gas recirculation gas channel and the heat exchanger channel from another perspective;

[0017] Figure 8 yes Figure 7A cross-sectional view of the cooling water channel, the gas recirculation gas channel and the heat exchanger channel along line II.

[0018] Description of reference numerals:

[0019] 50: Internal combustion engine;

[0020] 52, 54: cylinder bank;

[0021] 52a, 54a: water jacket;

[0022] 100: flow path structure;

[0023] 105: Radiator;

[0024] 110: channel body;

[0025] 1101: resting side channel body;

[0026] 1102: conventional side channel body;

[0027] 115: cooling water channel;

[0028] 120: Catalyst device;

[0029] 122: reflux gas channel;

[0030] 130: air intake device;

[0031] 140: Exhaust gas recirculation device;

[0032] 142: Water-cooled heat exchanger;

[0033] 144: reflux valve;

[0034] 150: exhaust gas recirculation gas channel;

[0035] 160: heat exchanger channel;

[0036] 162: heat exchanger supply channel;

[0037] 164: heat exchanger return channel;

[0038] 170: Thermostat;

[0039] 180: heater;

[0040] 190: pump;

[0041] A1: resting side area;

[0042] A2: conventional side area;

[0043] CW: cooling water;

[0044] E1, E2, E3, E4, E5, E6, E7, E8: connection end;

[0045] EG: exhaust gas;

[0046] F1, F2, F3: flow direction;

[0047] L: Dividing line. DETAILED DESCRIPTION

[0048] Figure 1 This is a partial schematic diagram of an internal combustion engine according to an embodiment of the present invention. Figure 1 The flow path structure 100 for an internal combustion engine of this embodiment includes a channel body 110, a catalyst device 120, an intake device 130, an exhaust gas recirculation (EGR) device 140, an exhaust gas recirculation gas passage 150, and a heat exchanger passage 160. The channel body 110 is disposed on the side of the internal combustion engine 50. The intake device 130, for example, includes an intake manifold structure, which is connected to the internal combustion engine 50. Air enters the internal combustion engine through the intake device 130. The catalyst device 120 is connected to the internal combustion engine 50. Exhaust generated by the internal combustion engine 50 flows through the catalyst device 120, is purified, and is then discharged.

[0049] The exhaust gas recirculation device 140 includes a water-cooled heat exchanger (exhaust gas recirculation cooler) 142 and a return valve (exhaust gas recirculation valve) 144, which are connected to each other. The water-cooled heat exchanger 142 and the return valve 144 are connected to the catalyst device 120 and the intake device 130. Specifically, the catalyst device 120 is connected to the water-cooled heat exchanger 142 via a return gas passage 122. The exhaust gas recirculation gas passage 150 is connected to the downstream end of the return valve 144 and is also connected to the intake device 130 via the exhaust gas recirculation gas passage 150. A portion of the exhaust gas EG generated by the internal combustion engine 50 flows from the catalyst device 120 through the return gas passage 122, the water-cooled heat exchanger 142, the return valve 144, the exhaust gas recirculation gas passage 150, and the intake device 130 in this order, and then flows back to the internal combustion engine 50. Heat exchanger passage 160 includes a heat exchanger supply passage 162 and a heat exchanger return passage 164. Heat exchanger supply passage 162 and heat exchanger return passage 164 are connected between internal combustion engine 50 and water-cooled heat exchanger 142. Internal combustion engine 50 supplies cooling water to water-cooled heat exchanger 142 via heat exchanger supply passage 162. This cooling water is heated by heat exchange in water-cooled heat exchanger 142 and then returns to internal combustion engine 50 via heat exchanger return passage 164.

[0050] Figure 2 yes Figure 1 Schematic diagram of the cooling water circuit of some components of the internal combustion engine. Figure 2Specifically, the flow path structure 100 of the internal combustion engine of this embodiment further includes a thermostat 170, a heater 180, a pump 190, and a radiator 105. The channel body 110 is connected to the water jackets 52a and 54a of the cylinder banks 52 and 54 within the internal combustion engine 50. Driven by the pump 190, the cooling water CW is heated by heat exchange in the cylinder banks 52 and 54, then flows through the channel body 110 to the radiator 105. After cooling by heat exchange in the radiator 105, it flows through the thermostat 170 and returns to the cylinder banks 52 and 54. A portion of the cooling water flows from the cylinder bank 54 to the water-cooled heat exchanger 142 of the exhaust gas recirculation device 140 for heat exchange, and then returns to the cylinder banks 52 and 54. A portion of the cooling water flows from the cylinder bank 54 to the heater 180 for heating, and then returns to the cylinder banks 52 and 54.

[0051] The detailed configuration, connection, and operation of the catalyst device 120 , the air intake device 130 , the exhaust gas recirculation device 140 , the thermostat 170 , the heater 180 , the pump 190 , and the radiator 105 are known technologies in the field of internal combustion engines and will not be elaborated herein.

[0052] Figure 3 yes Figure 1 A three-dimensional diagram of some components of the flow path structure. Figure 4 Show Figure 3 The local structure of the flow path structure. Figure 5 yes Figure 4 Top view of the flow path structure. Figure 6 Show Figure 5 The local structure of the cooling water channel, gas recirculation channel and heat exchanger channel. Figures 3 to 6 , the flow path structure 100 of this embodiment (marked at Figure 1 and Figure 2 ) also includes a cooling water channel 115, which is horizontally arranged in the channel body 110 and connected to Figure 2 The cylinder bank 52, cylinder bank 54, radiator 105 and heater 180 are shown. That is, the channel body 110 is connected to the cylinder bank 52, cylinder bank 54, radiator 105 and heater 180 through the cooling water channel 115 therein. The cooling water channel 115 is connected to the cylinder bank 52, cylinder bank 54, radiator 105 and heater 180 through the connecting ends E1 and E2 respectively. Figure 2 The cooling water channel 115 is connected to the cylinder banks 52 and 54 through the connecting ends E3 and E4. Figure 2 The radiator 105, the cooling water channel 115 is connected to the Figure 2 The specific pipe connection between the cooling water channel 115 and the cylinder bank 52, the cylinder bank 54, the radiator 105, and the heater 180 is a known technology in the field of internal combustion engines and will not be described in detail here.

[0053] The exhaust gas recirculation gas channel 150 and the heat exchanger return channel 164 are arranged along the cooling water channel 115. The cooling water channel 115, the exhaust gas recirculation gas channel 150 and the heat exchanger return channel 164 are integrally formed in the channel body 110. Specifically, for example, only a portion (such as Figure 4 The partial heat exchanger return channel 164 shown in FIG. 1 is located in the channel body 110, and another part of the heat exchanger return channel 164 (as shown in FIG. Figure 1 The local heat exchanger return channel 164 shown in the figure is not located in the channel body 110, for example. That is, in addition to disposing the cooling water channel 115 in the channel body 110, the flow path structure 100 of this embodiment also disposes the exhaust gas recirculation gas channel 150 and part of the heat exchanger return channel 164 in the channel body 110, so that the channel body 110 and the cooling water channel 115, the exhaust gas recirculation gas channel 150 and the heat exchanger return channel 164 disposed in the channel body 110 form an integrated structure (also referred to as a modular structure or an integrated structure). The exhaust gas recirculation gas channel 150 is connected to the exhaust gas recirculation gas channel 150 through the connection end E7, for example. Figure 1 The return valve 144 is connected to the Figure 1 The specific pipe connection between the exhaust gas recirculation gas channel 150 and the return valve 144 and the intake device 130 is a known technology in the field of internal combustion engines and will not be described in detail here.

[0054] As described above, in the flow path structure 100 of this embodiment, the cooling water channel 115, the EGR gas channel 150, and the heat exchanger return channel 164 are all disposed within the channel body 110, with the EGR gas channel 150 and the heat exchanger return channel 164 arranged along the cooling water channel 115. Consequently, the cooling water channel 115, the EGR gas channel 150, and the heat exchanger return channel 164 are adjacent to one another. The high-temperature water flowing through the cooling water channel 115 and the heat exchanger return channel 164 can provide thermal insulation for the gas in the EGR gas channel 150. Consequently, the flow path structure 100 of this embodiment can suppress the formation of condensed water in the EGR gas channel 150.

[0055] Please refer to Figure 5 In this embodiment, the flow direction F1 of the cooling water passage 115, the flow direction F2 of the exhaust gas recirculation passage 150, and the flow direction F3 of the heat exchanger return passage 164 are substantially the same. Accordingly, on the upstream side of the cooling water passage 115, the exhaust gas recirculation passage 150, and the heat exchanger return passage 164, the cylinder bank 54 (shown in FIG. 1 ) is connected to the cooling water passage 115. Figure 2 ) high temperature water flowing through the cooling water channel 115 and from the water-cooled heat exchanger 142 (shown in Figure 1 and Figure 2The high-temperature water flowing through heat exchanger return channel 164 heats the gas in exhaust gas recirculation channel 150, thereby promoting the aforementioned heat preservation effect. The arrangement of the remaining channel flow directions in flow path structure 100 is well known in the art of internal combustion engines and will not be elaborated upon here.

[0056] Figure 7 yes Figure 6 A stereoscopic view of the cooling water channel, the gas recirculating gas channel and the heat exchanger channel from another perspective. Figure 8 yes Figure 7 The cross-sectional view of the cooling water channel, the gas recirculation channel and the heat exchanger channel along line II. Figure 7 and Figure 8 In this embodiment, the cooling water channel 115 and the heat exchanger return channel 164 partially cover the exhaust gas recirculation channel 150. By arranging the exhaust gas recirculation channel 150 to be sandwiched between the cooling water channel 115 and the heat exchanger return channel 164, the heat insulation effect can be further improved to suppress the generation of condensed water.

[0057] In this embodiment, the internal combustion engine 50 is, for example, a V-type internal combustion engine, and Figure 2 The cylinder bank 52 shown is the dormant side cylinder bank, and the cylinder bank 54 is the regular side cylinder bank. Accordingly, the channel body 110 includes a dormant side channel body 1101 and a regular side channel body 1102 connected to the two cylinder banks 52 and 54, respectively. The dormant side channel body 1101 and the regular side channel body 1102 are respectively located at Figure 5 The diagram shows a dormant-side area A1 and a normal-side area A2 separated by a dividing line L. The exhaust gas recirculation (EGR) gas passage 150 is disposed within the normal-side passage body 1102 in the normal-side area A2 and is adjacent to the cooling water passage 115 and the heat exchanger return passage 164 in the normal-side area A2. Consequently, even when the cylinder bank 52 is dormant, the high-temperature water flowing through the cooling water passage 115 and the heat exchanger return passage 164 reliably keeps the gas in the EGR gas passage 150 warm.

[0058] In summary, in the flow path structure for an internal combustion engine of the present invention, the cooling water channel, the exhaust gas recirculation channel, and the heat exchanger return channel are all disposed within the channel body, with the exhaust gas recirculation channel and the heat exchanger return channel arranged alongside the cooling water channel. Consequently, the cooling water channel, the exhaust gas recirculation channel, and the heat exchanger return channel are adjacent to each other, and the high-temperature water flowing through the cooling water channel and the heat exchanger return channel can provide thermal insulation for the gas in the exhaust gas recirculation channel. Consequently, the flow path structure for an internal combustion engine of the present invention can suppress the formation of condensed water in the exhaust gas recirculation channel.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flow path structure for an internal combustion engine, characterized in that: include: a channel body, disposed on a side of the internal combustion engine and connected to a water jacket in the internal combustion engine; A cooling water channel is arranged in a horizontal direction, and the channel body is connected to the radiator through the cooling water channel; a catalyst device connected to the internal combustion engine; an air intake device connected to the internal combustion engine; an exhaust gas recirculation device, comprising a water-cooled heat exchanger and a return valve, wherein the water-cooled heat exchanger and the return valve are connected to the catalyst device and the air intake device; an exhaust gas recirculation gas passage connected to a downstream end of the return valve and to the intake device; as well as The heat exchanger reflux channel is connected to the water-cooled heat exchanger. The exhaust gas recirculation gas channel and the heat exchanger return channel are arranged along the cooling water channel. The cooling water channel, the exhaust gas recirculation channel, and the heat exchanger return channel are integrally formed in the channel body.

2. The flow path structure for an internal combustion engine according to claim 1, wherein: The cooling water channel, the exhaust gas recirculation channel, and the heat exchanger return channel have the same flow direction.

3. The flow path structure for an internal combustion engine according to claim 1 or 2, characterized in that: The cooling water passage and the heat exchanger return passage partially cover the exhaust gas recirculation gas passage.

4. The flow path structure for an internal combustion engine according to claim 1, wherein: The internal combustion engine is a V-type internal combustion engine and includes a dormant-side cylinder bank and a normal-side cylinder bank. The dormant side channel body in the channel body and the normal side channel body in the channel body are respectively connected to the dormant side cylinder bank and the normal side cylinder bank, and the exhaust gas recirculation gas channel is arranged in the normal side channel body.

Images