Explosion-proof diesel engine tail gas cooler

Abstract

The invention discloses an anti-explosion diesel engine tail gas cooler in the field of coolers. The anti-explosion diesel engine tail gas cooler comprises a main body and a breather pipe arranged in the main body. The breather pipe is spirally arranged in the main body, cooling liquid is contained in the main body, and an air inlet and an air outlet which are aligned with the two ends of the breather pipe are formed in the outer surface of the main body respectively; the expansion water tank is arranged on the main body, and the expansion water tank is used for filling cooling liquid into the main body and collecting the expanded cooling liquid in the main body; a plurality of heat exchange bags are arranged on the breather pipe, and a plurality of thin pipes which are arranged in parallel are arranged in the heat exchange bags. The contact area between gas in the breather pipe and cooling liquid in the main body is increased through the spirally-arranged breather pipe and the heat exchange bag on the breather pipe, the gas cooling speed is increased, the breather pipe is spirally arranged, the length of the breather pipe can be increased, the breather pipe is more compactly arranged in the main body, and the rapid cooling effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of coolers, and particularly to an explosion-proof diesel engine exhaust gas cooler. Background Art

[0002] At present, explosion-proof diesel engines are used in explosive gas environments and need to meet explosion-proof requirements. According to industry and national standards, the exhaust gas temperature of explosion-proof diesel engines is required not to be higher than 70°C. However, the exhaust gas after the diesel engine burns through work is in the range of four to five hundred degrees Celsius. The higher the displacement power of the diesel engine, the higher the heat content of the exhaust gas and the faster the gas flow rate, and the greater the difficulty of heat exchange and cooling required. Currently, there are two ways to cool the exhaust gas of explosion-proof diesel engines. One is immersion cooling, where the exhaust gas is cooled after being immersed in the waste gas treatment tank. The exhaust will carry away a large amount of water vapor, so it is necessary to continuously supplement cooling water. The capacity of the replenishment water tank carried on the vehicle is limited. The full-water operation time of a high-power diesel engine is about 1 hour, which brings a great burden of replenishing water to the driver. To solve the first method, some people have adopted non-immersion shell cooling, that is, the exhaust gas flows inside the shell, and fluid heat exchange is carried out outside the shell. There is a certain effect in theory, but if there is no large effective area of heat exchange, it is difficult for the exhaust gas to reduce the temperature to the required temperature. Therefore, in actual use, the second method is rarely used and only has a certain effect in the use of low-power and small-displacement diesel engines. Therefore, there is an urgent need for a cooler with high cooling efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide an explosion-proof diesel engine exhaust gas cooler, which improves the passing time of gas in the main body and the contact area between the gas and the external coolant through a spiral air pipe and heat exchange bags thereon, thereby improving the cooling efficiency.

[0004] To solve the above technical problems, the following technical solutions are adopted: The present invention provides an explosion-proof diesel engine exhaust gas cooler, including a main body and an air pipe arranged in the main body; the air pipe is arranged in a spiral shape in the main body, the main body is filled with coolant, and an air inlet and an air outlet are respectively arranged on the outer surface of the main body and are aligned with both ends of the air pipe; It further includes an expansion tank arranged on the main body, and the expansion tank is used for filling coolant into the main body and collecting the expanded coolant in the main body; A number of heat exchange bags are arranged on the air pipe, and a number of parallel thin pipes are arranged inside the heat exchange bags.

[0005] Optionally, the vent pipe includes a straight pipe portion, a spiral portion, a silencing portion, and a tail portion. The end of the straight pipe portion extends outside the main body and is connected to the outer surface of the main body through a connecting flange to form the air inlet. A plurality of the heat exchange sacs are arranged on the spiral portion. The silencing portion is located at the tail end of the spiral portion and is provided with a silencer. The tail portion is in a horn-shaped structure. The large diameter of the tail portion is connected to the outer surface of the main body to form an exhaust port, and a flame arrester is installed on the exhaust port.

[0006] Optionally, the heat exchange sac is overall spindle-shaped. The two ends of the thin pipe are respectively arranged on two horn connectors. The horn connector includes a fixing plate and a horn pipe. A plurality of round holes are provided on the fixing plate. The end of the thin pipe is matched with the round holes, and the fixing plate is installed at the large mouth end of the horn pipe.

[0007] Optionally, the main body includes a box body and a cover plate. The opening edge of the box body extends outwards to be provided with a connecting surface, and the cover plate is matched with the connecting surface to seal the box body.

[0008] Optionally, the air inlet is connected to the exhaust pipe of the diesel engine through an explosion-proof exhaust pipe. The exhaust port is connected to the flame arrester. A flame arrester mounting seat is further provided between the exhaust port and the flame arrester, and the flame arrester mounting seat is installed on the main body.

[0009] Optionally, the flame arrester is provided with a flame arrester exhaust pipe. After the gas enters the flame arrester from the exhaust port, it is discharged from the flame arrester exhaust pipe.

[0010] Optionally, the expansion water tank is connected to the water filling port on the main body through a connecting pipe.

[0011] Optionally, a water outlet and a water inlet are further provided on the side of the main body. The water outlet and the water inlet are located at two opposite vertex angles on the side of the main body. The water outlet and the water inlet are connected to an external heat dissipation system through a water pipe and a water pump, and the heat dissipation system is used for externally cooling and dissipating heat of the coolant.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. The present invention improves the contact area between the gas inside the vent pipe and the coolant inside the main body through the spirally arranged vent pipe and the heat exchange sacs thereon, and improves the cooling speed of the gas. The vent pipe is spirally arranged, which can increase the length of the vent pipe and be more compactly arranged inside the main body. The gas in the vent pipe passes through the thin pipes on the heat exchange sacs, thereby increasing the contact area between the gas and the coolant and achieving the effect of rapid cooling.

[0013] 2. The present invention is further provided with a silencer at the tail end of the vent pipe. The silencer can eliminate the noise between the tail gas and the vent pipe. The tail portion of the vent pipe is in a horn-shaped structure, which can reduce the back pressure of the tail gas and make it easier to enter the flame arrester. Brief Description of the Drawings

[0014] Figure 1 is a schematic diagram of the overall structure of the exhaust gas cooler of the explosion-proof diesel engine in the embodiment of the present invention; Figure 2 is a schematic diagram of the disassembled structure of the exhaust gas cooler of the explosion-proof diesel engine in the embodiment of the present invention; Figure 3 is a schematic diagram of the installation structure of the exhaust gas cooler of the explosion-proof diesel engine in the embodiment of the present invention; Figure 4 is a schematic diagram of the half-sectional structure of the exhaust gas cooler of the explosion-proof diesel engine in the embodiment of the present invention; Figure 5 is one of the schematic diagrams of the structure of the ventilation pipe and the cover plate in the embodiment of the present invention; Figure 6 is the second schematic diagram of the structure of the ventilation pipe and the cover plate in the embodiment of the present invention; Figure 7 is a schematic diagram of the box structure in the embodiment of the present invention; Figure 8 is a schematic diagram of the heat exchange bladder structure in the embodiment of the present invention; Figure 9 is a schematic cross-sectional view of the heat exchange bladder in the embodiment of the present invention.

[0015] Description of the Reference Numerals: 1. Main body; 11. Box body; 12. Cover plate; 13. Connection surface; 14. Water filling port; 15. Water inlet; 16. Water outlet; 2. Ventilation pipe; 21. Heat exchange bladder; 211. Thin pipe; 212. Fixed plate; 213. Flared pipe; 22. Straight pipe part; 23. Spiral part; 24. Sound absorption part; 25. Tail part; 26. Air inlet; 27. Connecting flange; 3. Flame arrester; 31. Flame arrester mounting seat; 32. Flame arrester exhaust pipe; 4. Expansion tank; 41. Connecting pipe; 5. Diesel engine; 51. Explosion-proof exhaust pipe; 6. Water pump; 7. Radiator; 8. Water pipe. Detailed Embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use.

[0017] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention 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 thus should not be construed as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances. Embodiment 1

[0018] This embodiment provides an explosion-proof diesel engine exhaust gas cooler, which includes a main body 1 and an air pipe 2 arranged in the main body 1; the air pipe 2 is arranged in a spiral shape in the main body 1, the main body 1 is filled with coolant, and the main body 1 is respectively provided with an air inlet and an exhaust port that are aligned with both ends of the air pipe 2; It further includes an expansion tank 4, which is arranged on the main body 1, and the expansion tank 4 is used for filling coolant into the main body 1 and collecting the expanded coolant in the main body 1; A number of heat exchange capsules 21 are provided on the air pipe 2, and a number of thin pipes 211 arranged in parallel are provided inside the heat exchange capsules 21.

[0019] As Figure 1 , Figure 2 , Figure 3 described, the air inlet is connected to the tail gas pipe of the diesel engine 5. After the tail gas enters from the air inlet, it flows in the air pipe 2 and exchanges heat with the coolant outside the air pipe 2 to reduce the temperature of the tail gas, and then enters the flame arrester 3 from the exhaust port for further treatment and then discharged. The air pipe 2 is directly immersed in the coolant in the main body 1. The coolant is added through the expansion tank 4 and expands when the temperature of the coolant in the main body 1 rises, and can also enter the expansion tank 4, avoiding damage to the main body 1 and the internal air pipe 2 caused by the expansion of the coolant in the main body 1.

[0020] The main body 1 is also connected with a heat dissipation system. The coolant in the main body 1 is dissipated through the heat dissipation system and then discharged back into the main body 1 to realize the recycling and cooling utilization of the coolant. The loss of the coolant is replenished into the main body 1 through the expansion tank 4 to ensure that the coolant completely immerses the internal ventilation pipe 2. Embodiment 2

[0021] Based on Embodiment 1, this embodiment provides an explosion-proof diesel engine exhaust gas cooler, the difference being: As Figure 1 、 Figure 7 shown, the main body 1 includes a box body 11 and a cover plate 12. The edge of the opening of the box body 11 extends outward to form a connection surface 13. The cover plate 12 is in contact and cooperation with the connection surface 13 to seal the opening of the box body 11. An inlet 15 and an outlet 16 are provided on the side wall of the box body 11. The inlet 15 and the outlet 16 are arranged at two pairs of opposite corners of the side wall. One end of the inlet 15 is close to the cover plate 12, and the outlet 16 is arranged at one end close to the bottom. The inlet 15 and the outlet 16 are connected to the radiator 7 through a water pipe 8 and a water pump 6. The water pump 6 transports the coolant in the box body 11 to the radiator 7 for heat dissipation, and the heat-dissipated coolant then flows back into the box body 11 for heat exchange to realize the recycling of the coolant. For the loss during recycling, the expansion tank 4 heats the coolant to prevent the coolant in the box body 11 from being able to completely immerse the ventilation pipe 2.

[0022] As Figure 4 、 Figure 5 、 Figure 6 shown, the ventilation pipe 2 includes a straight pipe portion 22, a spiral portion 23, a silencing portion 24 and a tail portion 25. A number of heat exchange sacs 21 are provided on the spiral portion 23. One end of the straight pipe portion 22 penetrates from the bottom of the cover plate 12 to the upper surface and is installed on the upper surface of the cover plate 12 through a connection flange 26 to form an air inlet. The air inlet is connected to the tail pipe of the diesel engine 5 through an explosion-proof exhaust pipe 51. The silencing portion 24 is located at the tail end of the spiral portion 23, and a silencer is provided on the silencing portion 24. After the exhaust gas enters the ventilation pipe 2 from the air inlet, it passes through the heat exchange sacs 21 on the spiral portion 23, then passes through the silencer, and then enters the flame arrester 3 through the tail portion 25. The silencer can eliminate the sound generated by the gas due to its interaction with the ventilation pipe 2. The tail portion 25 is a horn-shaped structure. The large opening in the horn-shaped structure of the tail portion 25 is connected to the cover plate 12 to form an exhaust port. A through hole communicating with the large opening is provided on the cover plate 12, and a flame arrester mounting seat 31 is installed on the through hole. A flame arrester 3 is installed on the flame arrester mounting seat 31. The exhaust port is communicated with the flame arrester 3, and the gas enters the flame arrester 3 from the exhaust port for treatment. A flame arrester exhaust pipe 32 is provided on the flame arrester 3, and the gas treated by the flame arrester 3 is discharged from the flame arrester exhaust pipe 32. The horn-shaped tail portion 25 can reduce the gas back pressure and enable the gas to enter the flame arrester 3 more smoothly.

[0023] AsFigure 8 , Figure 9 As shown in Figure 9 , the overall shape of the heat exchange bladder 21 is spindle-shaped. Connectors are connected to both ends of a number of thin tubes 211. The connectors are connected to the ventilation pipe 2. The connector includes a horn-shaped pipe 213 and a fixing plate 212. A number of round holes matching the thin tubes 211 are provided on the fixing plate 212. Both ends of the thin tubes 211 are respectively installed in the round holes on the fixing plate 212. The fixing plate 212 is installed at the large opening of the horn-shaped pipe 213. The small opening of the horn-shaped pipe 213 is connected to the ventilation pipe 2. When gas passes through each heat exchange bladder 21 on the ventilation pipe 2, the air flow will be divided into a number of thin tubes 211 to increase the contact area between the air flow and the external coolant. The horn-shaped pipe 213 can guide the gas to diffuse into the thin tubes 211. The number of heat exchange bladders 21 can be increased according to requirements and the device space to be used for explosion-proof oil production machines with different power segments and displacements.

[0024] As Figure 2 , Figure 4 , Figure 5 As shown in Figure 2 , Figure 4 , Figure 5 , an expansion water tank 4 is also provided on the cover plate 12. The expansion water tank 4 is connected to the water filling port 14 on the cover plate 12 through a connecting pipe 41. The water filling port 14 on the cover plate 12 communicates with the inside of the box body 11. A coolant inlet is provided at the top of the expansion water tank 4. The coolant enters the expansion water tank 4 through the coolant inlet and then enters the inside of the box body 11. When heat exchange occurs inside the box body 11, the coolant expands due to the increase in temperature, and the coolant inside the box body 11 enters the expansion water tank 4 for temporary storage.

[0025] During use, the exhaust gas generated by the diesel engine 5 enters the ventilation pipe 2 through the connecting pipe 41 and starts to exchange heat with the coolant outside the ventilation pipe 2, thereby reducing the temperature of the exhaust gas. The exhaust gas passes through the straight pipe part 22, the spiral part 23, the heat exchange bladder 21 thereon, the silencing part 24 and the tail part 25 on the ventilation pipe 2 in sequence, and enters the flame arrester 3 from the exhaust port of the tail part 25, and finally is discharged from the flame arrester exhaust pipe 32 on the flame arrester 3. Since the spiral part 23 on the ventilation pipe 2 is spirally distributed, the passing path of the exhaust gas is long, resulting in a long passing time and a long stay time inside the box body 11, and longer heat exchange occurs with the coolant inside the box body 11. And inside the heat exchange bladder 21 on the spiral part 23, the air flow dispersed into a number of thin tubes 211 exchanges heat with the external coolant in each thin tube 211, increasing the contact area during heat exchange, thereby improving the heat exchange efficiency.

[0026] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. An explosion-proof diesel engine exhaust cooler, characterized in that: It comprises a main body and a vent pipe arranged in the main body; the vent pipe is spirally arranged in the main body, the main body is filled with coolant, and the outer surface of the main body is respectively provided with an air inlet and an air outlet arranged in alignment with two ends of the vent pipe; It also includes an expansion water tank, which is arranged on the main body and is used to add coolant into the main body and collect the coolant in the main body after expansion; A plurality of heat exchange bags are arranged on the ventilation pipe, and a plurality of parallel-arranged thin tubes are arranged inside the heat exchange bags.

2. The diesel engine exhaust cooler according to claim 1, characterized in that: The vent pipe includes a straight pipe portion, a spiral portion, a silencer portion and a tail portion, the end of the straight pipe portion extends outside the main body and is connected to the outer surface of the main body through a connecting flange to form the air inlet, a plurality of heat exchange bags are arranged on the spiral portion, the silencer portion is located at the tail end of the spiral portion and is provided with a silencer, the tail portion is a trumpet-shaped structure, the large diameter of the tail portion is connected to the outer surface of the main body to form an exhaust port, and a flame arrester is installed on the exhaust port.

3. The diesel engine exhaust cooler according to claim 1, characterized in that: The heat exchange bag is shuttle-shaped as a whole, and the two ends of the thin tube are respectively arranged on two horn joints. The horn joint includes a fixing plate and a horn tube. The fixing plate is provided with a plurality of circular holes, and the ends of the thin tube cooperate with the circular holes. The fixing plate is installed at the large end of the horn tube.

4. The diesel engine exhaust cooler according to claim 1, characterized in that: The main body comprises a box body and a cover plate. The opening edge of the box body is extended outward to be provided with a connecting surface. The cover plate cooperates with the connecting surface to seal the box body.

5. The diesel engine exhaust cooler according to claim 1, characterized in that: The air inlet is connected to the exhaust pipe of the diesel engine through an explosion-proof exhaust pipe, the exhaust port is connected to the flame arrester, a flame arrester mounting seat is provided between the exhaust port and the flame arrester, and the flame arrester mounting seat is mounted on the main body.

6. The diesel engine exhaust cooler according to claim 5, characterized in that: The flame arrester is provided with a flame arrester exhaust pipe, and the gas enters the flame arrester from the exhaust port and is discharged from the flame arrester exhaust pipe.

7. The diesel engine exhaust cooler according to claim 1, characterized in that: The expansion water tank is connected to the water inlet on the main body through a connecting pipe.

8. The diesel engine exhaust cooler according to claim 1, characterized in that: The side of the main body is also provided with a water outlet and a water inlet, and the water outlet and the water inlet are located at two opposite corners of the side of the main body. The water outlet and the water inlet are connected to an external cooling system through a water pipe and a water pump, and the cooling system is used to externally cool and dissipate the coolant.

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