Exhaust cooling device

Abstract

The invention relates to an exhaust cooling device which comprises a fixed pipe, a first throttling pipe and a second throttling pipe. The second throttle pipe is arranged in the first throttle pipe, and a plurality of water inlets are formed in the center of the second throttle pipe; the water supplementing tank is arranged on one side of the first throttling pipe; the water level valve is arranged in the water replenishing tank and is connected with external water supply equipment; two ends of the balance pipe respectively penetrate through the air inlet pipe and the water replenishing tank; the water supplementing pipe comprises a water conveying pipe and a plurality of connecting pipes, the water conveying pipe is in an inverted U shape, a water suction opening and a water outlet are formed in the two ends of the water conveying pipe respectively, and the two ends of the connecting pipes are connected with the water inlet and the water outlet respectively; water can be automatically absorbed, cooling water is changed into water mist to be evenly mixed and contacted with tail gas, the water mist and the tail gas are subjected to gas-liquid mixed flow in the mixing pipe, water absorbs heat and is vaporized, the cooling effect on the tail gas is enhanced, the heat exchange efficiency is improved, and practicability is high.

Description

Technical Field

[0001] The present application relates to the technical field of cooling devices, and in particular to an exhaust gas cooling device. Background Art

[0002] Diesel engines play a vital role in modern industry and transportation, and are widely used in heavy machinery, ships and power generation equipment. With the increasing demand for environmental protection, the exhaust gas treatment of diesel engines has become particularly important. As one of the key components for cooling diesel engine exhaust and reducing pollutants, the exhaust gas treatment box is directly related to the engine's operating safety and environmental performance. Therefore, how to effectively reduce the temperature of diesel engine exhaust and reduce pollutant emissions has become a problem that needs to be solved in the diesel engine field.

[0003] At present, diesel engine exhaust cooling devices mainly adopt water-filled cooling, that is, absorbing the heat of high-temperature exhaust gas through structures such as water pools to achieve the purpose of exhaust cooling. Common methods include setting a water pool directly on the exhaust path, or setting a water spray device in the exhaust path to spray cooling water. Although these methods can reduce the exhaust temperature to a certain extent, they have some limitations in practical applications.

[0004] Traditional diesel engine exhaust cooling devices generally have the problems of large size and limited installation space. In particular, the inflation cooling method in the water pool leads to low heat exchange efficiency and poor adaptability under different working conditions, making it difficult to achieve water saving and effective use of installation space.

[0005] In view of the above problems, an exhaust gas cooling device is now designed. Summary of the invention

[0006] An embodiment of the present application provides an exhaust cooling device to solve the problems of large size and limited installation space commonly found in diesel engine exhaust cooling devices in related technologies, especially the inflation cooling method in a water pool leads to low heat exchange efficiency and poor adaptability under different working conditions, making it difficult to achieve water saving and effective use of installation space.

[0007] In a first aspect, an exhaust gas cooling device is provided, comprising:

[0008] A fixed pipe, the fixed pipe comprising an intake pipe, a first throttle pipe and a mixing pipe, the first throttle pipe being arranged at the lower end of the intake pipe, the mixing pipe being arranged at an end of the first throttle pipe away from the intake pipe, the first throttle pipe being funnel-shaped, and the diameter of the central part of the first throttle pipe being smaller than the diameters of the two ends of the first throttle pipe;

[0009] A second throttling tube, which is arranged in the first throttling tube, the second throttling tube is funnel-shaped, the diameter of the central part of the second throttling tube is smaller than the diameters of the two ends of the second throttling tube, the central part of the second throttling tube corresponds to the central part of the first throttling tube, and the central part of the second throttling tube is provided with a plurality of water inlets;

[0010] A water supply tank, which is arranged on one side of the first throttle pipe;

[0011] A water level valve is arranged in the water supply tank and connected to an external water supply device to control the cooling water in the water supply tank to a set water level;

[0012] A balance pipe, both ends of which penetrate the air inlet pipe and the water supply tank respectively, and the balance pipe is located above the set water level of the water supply tank;

[0013] The water replenishment pipe comprises a water delivery pipe and a plurality of connecting pipes, wherein the water delivery pipe is in an inverted "U" shape and is located above a set water level. A water suction port and a water outlet are respectively arranged at both ends of the water delivery pipe. The water suction port is located inside a water replenishment tank and is located below the set water level. The water outlet is located outside the water replenishment tank and is located below the set water level. The water outlet is in the same horizontal plane as the water inlet and is located below the water suction port. The two ends of the plurality of connecting pipes are respectively connected to the water inlet and the water outlet.

[0014] In some embodiments, the plurality of water inlets are evenly distributed in a ring shape on the second throttling tube.

[0015] In some embodiments, the water level valve includes a water inlet pipe, a first valve core, a second valve core, a plug, a connecting rod and a float. The water inlet pipe is arranged on the water replenishing tank, and the lower end of the water inlet pipe passes through the water replenishing tank and extends into the water replenishing tank. The first valve core and the second valve core are both arranged in the water inlet pipe, and the first valve core is located above the second valve core. A first through hole is opened on the first valve core, and a plurality of second through holes are opened on the second valve core. The plug is arranged in the water inlet pipe, and the plug is located between the first valve core and the second valve core. The connecting rod is arranged at the lower end of the plug, and the float is arranged at the lower end of the connecting rod.

[0016] In some embodiments, a plurality of diverter tubes are further included, and the plurality of diverter tubes are all disposed on the mixing tube and communicated with the mixing tube.

[0017] In some embodiments, the diverter pipe includes an inclined section and a straight section, the upper end of the inclined section is arranged on the mixing tube and communicated with it, the inclined section is inclined, the straight section is arranged at the lower end of the inclined section, and the straight section is parallel to the mixing tube.

[0018] In some embodiments, a transparent observation window is provided on one side of the water replenishment tank.

[0019] In some embodiments, the first throttle tube and the second throttle tube are on the same axis.

[0020] In some embodiments, the air intake pipe, the first throttle pipe and the mixing pipe are integrally formed.

[0021] An embodiment of the present application provides an exhaust cooling device. The present application can use the Venturi principle and the siphon principle to enable the device to automatically absorb water and convert the cooling water into water mist that is evenly mixed and contacted with the exhaust gas, so that the water mist and the exhaust gas can form a gas-liquid mixed flow in the mixing tube, and the water absorbs heat and vaporizes, thereby enhancing the cooling effect on the exhaust gas and increasing the heat exchange efficiency. At the same time, the device can automatically absorb water and adjust the water volume as the diesel engine is started, operated, and shut down, thereby enhancing applicability and avoiding waste of water resources. At the same time, the size of the device can be reduced for easy installation and use, thereby enhancing the flexibility of the device and making it highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of the structure provided for an embodiment of the present application;

[0024] Figure 2 Provided in the embodiments of this application Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 3 A schematic diagram of the structure of the water supply pipe provided in an embodiment of the present application.

[0026] In the figure: 1. fixed pipe; 11. air inlet pipe; 12. first throttle pipe; 13. mixing pipe; 2. second throttle pipe; 21. water inlet; 3. water supply tank; 4. water level valve; 41. water inlet pipe; 42. first valve core; 43. second valve core; 44. plug; 45. connecting rod; 46. float; 47. first through hole; 48. second through hole; 5. balance pipe; 6. water supply pipe; 61. water delivery pipe; 611. water suction port; 612. water outlet; 62. connecting pipe; 7. diverter pipe; 71. inclined section; 72. straight section. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] The embodiment of the present application provides an exhaust cooling device, which can solve the problems of large size and limited installation space commonly existing in diesel engine exhaust cooling devices in related technologies, especially the inflation cooling method in the water pool leads to low heat exchange efficiency and poor adaptability under different working conditions, making it difficult to achieve water saving and effective use of installation space.

[0029] See also Figure 1-Figure 3 , an exhaust gas cooling device, comprising: a fixed pipe 1, a second throttle pipe 2, a water supply tank 3, a water level valve 4, a balance pipe 5 and a water supply pipe 6, the fixed pipe 1 comprises an intake pipe 11, a first throttle pipe 12 and a mixing pipe 13, the first throttle pipe 12 is arranged at the lower end of the intake pipe 11, the mixing pipe 13 is arranged at the end of the first throttle pipe 12 away from the intake pipe 11, the first throttle pipe 12 is funnel-shaped (conical concentric with different diameters), and the diameter of the central part of the first throttle pipe 12 is smaller than the diameter of the two ends of the first throttle pipe 12;

[0030] The inlet area of ​​the upper end of the first throttle tube 12 is defined as S1, and the air pressure here is P1. The inlet area of ​​the central part of the first throttle tube 12 is defined as S1', and the air pressure here is P1'. Since the first throttle tube 12 is funnel-shaped, S1>S1';

[0031] The second throttling tube 2 is arranged in the first throttling tube 12, the first throttling tube 12 and the second throttling tube 2 are on the same axis, the second throttling tube 2 is funnel-shaped (conical concentric with different diameters), the diameter of the central part of the second throttling tube 2 is smaller than the diameters of the two ends of the second throttling tube 2, the central part of the second throttling tube 2 corresponds to the central part of the first throttling tube 12, and the central part of the second throttling tube 2 is provided with a plurality of water inlets 21;

[0032] The inlet area of ​​the upper end of the second throttle tube 2 is defined as S2, where the air pressure is P2, and the inlet area of ​​the central part of the second throttle tube 2 is defined as S2', where the air pressure is P2'. Since the second throttle tube 2 is funnel-shaped, S2>S2';

[0033] The water supply tank 3 is arranged on one side of the first throttle tube 12, and the water level valve 4 is arranged in the water supply tank 3 and connected to the external water supply equipment, so as to control the cooling water in the water supply tank 3 at a set water level. The two ends of the balance pipe 5 respectively penetrate the air intake pipe 11 and the water supply tank 3, and the balance pipe 5 is located above the set water level of the water supply tank 3, so that the air intake pipe 11 can be connected with the inside of the water supply tank 3 through the balance pipe 5, so that the air pressure inside the air intake pipe 11 and the water supply tank 3 is unified to P1;

[0034] The water replenishment pipe 6 includes a water delivery pipe 61 and a plurality of connecting pipes 62. The water delivery pipe 61 is in an inverted "U" shape. The water delivery pipe 61 is located above the set water level. The height difference between the upper end of the water delivery pipe 61 and the set water level is H1. The two ends of the water delivery pipe 61 are respectively provided with a water suction port 611 and a water outlet 612. The water suction port 611 is located in the water replenishment tank 3. The water suction port 611 is located below the set water level. The water outlet 612 is located outside the water replenishment tank 3. The water outlet 612 is located below the set water level. The water outlet 612 is in the same horizontal plane as the water inlet 21. The water outlet 612 is located below the water suction port 611. The two ends of the plurality of connecting pipes 62 are respectively connected to the water inlet 21 and the water outlet 612. The second throttling pipe 2 is installed and fixed in the fixed pipe 1 through the connecting pipe 62.

[0035] In this way, when it is necessary to cool the exhaust gas of the diesel engine, the water supply equipment and the water level valve 4 can be used to replenish the cooling water in the water tank 3 to the set water level, and then the engine exhaust pipe can be connected to the intake pipe 11, so that the exhaust gas is discharged into the first throttle tube 12 and the second throttle tube 2 through the intake pipe 11. In this way, when the exhaust gas flows in the funnel-shaped second throttle tube 2, according to the fluid continuity equation (law of conservation of mass) and the Bernoulli equation (law of conservation of energy), when the exhaust gas flows through the second throttle tube 2, due to the reduction of the inlet area S2' of the central part of the second throttle tube 2, the flow rate will form a local contraction at the central part of the second throttle tube 2, so that the exhaust gas will increase its flow rate in the central part of the second throttle tube 2, resulting in a decrease in static pressure, thereby generating a pressure difference. The pressure difference when the gas enters the central part of the second throttle tube 2 from the upper end of the second throttle tube 2 is P2-P2'=ΔP2. The larger the fluid flow rate, the greater the pressure difference generated.

[0036] According to the Venturi effect, when the pressure difference ΔP2 generated by the exhaust flow is greater than the pressure difference between the water pipe 61 and the set water level H1, a communicating vessel effect will be generated, and the cooling water will be sucked into the water pipe 61 through the water inlet 611 under the action of the air pressure P1, and discharged into the connecting pipe 62 through the water outlet 612 through the siphon principle, and finally discharged from the water inlet 21 on the second throttling pipe 2 through the connecting pipe 62, so that the cooling water can contact and mix with the high-temperature exhaust gas, thereby cooling the exhaust gas. At the same time, the high-speed flowing gas will also break up the cooling water into water mist, so that the cooling water can be fully mixed and contacted with the high-temperature exhaust gas;

[0037] At the same time, according to the Venturi principle, when the high-temperature exhaust gas passes through the second throttle tube 2, the opening area of ​​the lower part of the second throttle tube 2 gradually increases, so the air flow velocity decreases and turbulence is generated, and the entrained cooling water is mixed and stirred in the mixing tube 13. The water absorbs the heat of the high-temperature exhaust gas and vaporizes to form low-temperature mixed steam, which is finally discharged outward through the mixing tube 13;

[0038] At the same time, when the exhaust gas flows in the first throttle tube 12, the principle is consistent with that of the second throttle tube 2. The pressure difference when the gas enters the central part of the first throttle tube 12 from the upper end of the first throttle tube 12 is P1-P1'=ΔP1, so that the exhaust gas will further generate turbulence when it flows out from the lower end of the first throttle tube 12. In this way, through the superposition and cooperation of the first throttle tube 12 and the second throttle tube 2, the turbulence effect of the exhaust gas in the mixing tube 13 can be enhanced, so that the high-temperature exhaust gas can be more evenly and fully mixed and stirred with the cooling water mist, so that the cooling effect of the exhaust gas can be further enhanced;

[0039] At the same time, when the throttle and load of the diesel engine change, the exhaust gas flow rate increases or decreases, and ΔP2 also increases or decreases accordingly, so that the amount of water siphoned also increases or decreases accordingly to meet the exhaust gas cooling water demand. When the diesel engine stops, the exhaust volume decreases until there is no exhaust gas. When ΔP2 is less than the pressure difference generated by H1, the siphon condition is destroyed, and the water flow can no longer be sucked into the fixed pipe through the water supply pipe 6. At this time, the cooling process stops, so that the device can automatically absorb water and adjust the water volume as the diesel engine starts, runs and stops, thereby enhancing applicability and avoiding waste of water resources.

[0040] In this way, when the exhaust gas of the diesel engine is cooled by the device, it can not only automatically absorb water and turn the cooling water into water mist to be evenly mixed and contacted with the exhaust gas, but also make the water mist and the exhaust gas to form a gas-liquid mixed flow in the mixing tube 13, and make the water absorb heat and vaporize, thereby enhancing the cooling effect on the exhaust gas and increasing the heat exchange efficiency. At the same time, there is no need to set up an additional driving source to extract cooling water and stir the exhaust gas. The device has a simple structure, is energy-saving and environmentally friendly, can reduce production costs, and is easy to maintain and overhaul. When cooling the exhaust gas, the device does not require a large amount of cooling water for cooling, so that the size of the device can be reduced, which is convenient for disassembly and maintenance, thereby enhancing the flexibility of the device and having strong practicality.

[0041] See also Figure 3 In this embodiment, the water inlets 21 are evenly distributed in a ring shape on the second throttling tube 2;

[0042] In this way, when the cooling water enters the second throttling tube 2, the cooling water can be discharged more evenly, so that the water mist can be formed more evenly and fully, so that the water mist can contact and exchange heat with the exhaust gas, thereby ensuring the heat exchange efficiency of the device.

[0043] See also Figure 2 The water level valve 4 includes a water inlet pipe 41, a first valve core 42, a second valve core 43, a plug 44, a connecting rod 45 and a floating ball 46. The water inlet pipe 41 is arranged on the water replenishing tank 3. The lower end of the water inlet pipe 41 penetrates the water replenishing tank 3 and extends into the water replenishing tank 3. The first valve core 42 and the second valve core 43 are both arranged in the water inlet pipe 41. The first valve core 42 is located above the second valve core 43. A first through hole 47 is opened on the first valve core 42, and a plurality of second through holes 48 are opened on the second valve core 43. The plug 44 is arranged in the water inlet pipe 41, and the plug 44 is located between the first valve core 42 and the second valve core 43. The connecting rod 45 is arranged at the lower end of the plug 44, and the floating ball 46 is arranged at the lower end of the connecting rod 45.

[0044] In this way, when supplying water to the water supply tank 3, the water inlet pipe 41 can be connected to the water supply device to supply water to the water inlet pipe 41, so that the plug 44 will move down and fall on the second valve core 43 due to the gravity of the float 46, so that the cooling water can enter the water supply tank 3 through the first through hole 47 and the second through hole 48. As the water level in the water supply tank 3 increases, the float 46 will gradually float up due to the buoyancy of the water, so that the float 46 drives the plug 44 to move up through the connecting rod 45;

[0045] When the float 46 drives the plug 44 to press against the first valve core 42, the plug 44 will block the first through hole 47, so that the water inlet pipe 41 stops supplying water. At this time, the water level in the water supply tank 3 reaches the set position. As the exhaust gas continues to cool down, the water supply pipe 6 continues to pump water, and the water level in the water supply tank 3 drops. In this way, the float 46 will drive the plug 44 to move downward through the connecting rod 45, so that the first through hole 47 is connected to the water supply again. This cycle is repeated, and the device can always provide water for the water supply tank 3 and keep the water in the water supply tank 3 at the set water level, which is highly practical.

[0046] Specifically, in this embodiment, a plurality of flow dividing pipes 7 are also included, and the plurality of flow dividing pipes 7 are all arranged on the mixing pipe 13 and communicated with the mixing pipe 13;

[0047] In this way, when the exhaust gas flows into the mixing tube 13, it will enter the connection between the diverter tube 7 and the mixing tube 13, so that the airflow can flow in the special-shaped pipe space, thereby further enhancing the turbulence effect on the exhaust gas. At the same time, the airflow can be dispersed by the diverter tube 7 to reduce the flow rate of the exhaust gas, thereby increasing the contact and mixing time between the exhaust gas and the water mist, so as to further enhance the heat exchange and cooling effect of the exhaust gas, and the practicability is strong.

[0048] More specifically, the diverter pipe 7 includes an inclined section 71 and a straight section 72. The upper end of the inclined section 71 is disposed on the mixing pipe 13 and communicates with the mixing pipe 13. The inclined section 71 is inclined. The straight section 72 is disposed at the lower end of the inclined section 71. The straight section 72 is parallel to the mixing pipe 13.

[0049] In this way, when the airflow flows from the inclined section 71 to the straight section 72, the curved diverter pipe 7 can further reduce the exhaust speed of the exhaust gas, thereby reducing the impact and noise generated when the device treats the exhaust gas, making it easier to use.

[0050] Preferably, a transparent observation window is provided on one side of the water replenishment tank 3;

[0051] In this way, the staff can detect the water supply situation and the water level in the water replenishment tank 3 in real time through the transparent observation window, so as to be able to check the water replenishment tank 3 in time.

[0052] The air intake pipe 11, the first throttle pipe 12 and the mixing pipe 13 are integrally processed;

[0053] In this way, the structural strength of the fixed pipe 1 can be ensured, thereby ensuring the service life of the device.

[0054] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0055] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0056] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An exhaust gas cooling device, characterized in that: It includes: A fixed pipe (1), the fixed pipe (1) comprising an intake pipe (11), a first throttle pipe (12) and a mixing pipe (13), the first throttle pipe (12) being arranged at the lower end of the intake pipe (11), the mixing pipe (13) being arranged at an end of the first throttle pipe (12) away from the intake pipe (11), the first throttle pipe (12) being funnel-shaped, and the diameter of the central portion of the first throttle pipe (12) being smaller than the diameters of the two ends of the first throttle pipe (12); a second throttling tube (2) arranged in the first throttling tube (12); the second throttling tube (2) is funnel-shaped; the diameter of the central portion of the second throttling tube (2) is smaller than the diameters of the two ends of the second throttling tube (2); the central portion of the second throttling tube (2) corresponds to the central portion of the first throttling tube (12); and a plurality of water inlets (21) are provided in the central portion of the second throttling tube (2); A water supply tank (3) arranged on one side of the first throttling tube (12); A water level valve (4) is arranged in the water supply tank (3) and connected to an external water supply device, so as to control the cooling water in the water supply tank (3) to a set water level; A balance pipe (5), both ends of which respectively penetrate the air inlet pipe (11) and the water supply tank (3), and the balance pipe (5) is located above the set water level of the water supply tank (3); The water replenishment pipe (6) comprises a water delivery pipe (61) and a plurality of connecting pipes (62). The water delivery pipe (61) is in an inverted "U" shape. The water delivery pipe (61) is located above a set water level. Two ends of the water delivery pipe (61) are respectively provided with a water suction port (611) and a water outlet (612). The water suction port (611) is located inside the water replenishment tank (3). The water suction port (611) is located below the set water level. The water outlet (612) is located outside the water replenishment tank (3). The water outlet (612) is located below the set water level. The water outlet (612) and the water inlet (21) are in the same horizontal plane. The water outlet (612) is located below the water suction port (611). Two ends of the plurality of connecting pipes (62) are respectively connected to the water inlet (21) and the water outlet (612).

2. An exhaust gas cooling device according to claim 1, characterized in that: The plurality of water inlets (21) are evenly distributed in a ring shape on the second throttling tube (2).

3. An exhaust gas cooling device according to claim 1, characterized in that: The water level valve (4) comprises a water inlet pipe (41), a first valve core (42), a second valve core (43), a plug (44), a connecting rod (45) and a floating ball (46); the water inlet pipe (41) is arranged on the water replenishment tank (3); the lower end of the water inlet pipe (41) penetrates the water replenishment tank (3) and extends into the water replenishment tank (3); the first valve core (42) and the second valve core (43) are both arranged in the water inlet pipe (41); the first valve core (42) is located at the bottom of the water replenishment tank (3); the second valve core (43) is located at the bottom of the water replenishment tank (3 ... Above the second valve core (43), the first valve core (42) is provided with a first through hole (47), the second valve core (43) is provided with a plurality of second through holes (48), the plug (44) is arranged in the water inlet pipe (41), the plug (44) is located between the first valve core (42) and the second valve core (43), the connecting rod (45) is arranged at the lower end of the plug (44), and the float (46) is arranged at the lower end of the connecting rod (45).

4. An exhaust gas cooling device according to claim 1, characterized in that: It also comprises a plurality of flow dividing pipes (7), wherein the plurality of flow dividing pipes (7) are all arranged on the mixing pipe (13) and communicated with the mixing pipe (13).

5. An exhaust gas cooling device as claimed in claim 4, characterized in that: The flow dividing pipe (7) comprises an inclined section (71) and a straight section (72); the upper end of the inclined section (71) is arranged on the mixing pipe (13) and communicates with the mixing pipe (13); the inclined section (71) is arranged in an inclined manner; the straight section (72) is arranged at the lower end of the inclined section (71); and the straight section (72) is parallel to the mixing pipe (13).

6. An exhaust gas cooling device according to claim 1, characterized in that: A transparent observation window is provided on one side of the water replenishment tank (3).

7. The exhaust gas cooling device according to claim 1, characterized in that: The first throttle tube (12) and the second throttle tube (2) are located on the same axis.

8. An exhaust gas cooling device according to claim 1, characterized in that: The air intake pipe (11), the first throttle pipe (12) and the mixing pipe (13) are integrally processed.

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