Preheating device, methanol engine and vehicle

Abstract

The utility model discloses a kind of preheating device, methanol engine and vehicle, it is related to vehicle technical field, wherein, preheating device is used to heat the fuel in the oil tank of engine, the engine further includes exhaust pipe, the preheating device includes air pipe, air outlet pipe, heat exchange device and air pump, one end of the air pipe is communicated with the exhaust pipe;The air outlet pipe is connected with the other end of the air pipe by the heat exchange device, the air outlet pipe is communicated with the exhaust pipe, and located between the air pipe and the exhaust pipe exhaust end, the heat exchange device is built-in in the oil tank;Air pump is used to guide high-temperature exhaust gas in the exhaust pipe into the heat exchange device;The technical scheme provided by the utility model can improve energy utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a preheating device, a methanol engine, and a vehicle. Background Technology

[0002] Existing engines generally suffer from poor starting performance, especially methanol engines, which are particularly difficult to start in low-temperature environments.

[0003] Because methanol has a high latent heat of vaporization, it needs to absorb a large amount of heat to form a combustible mixture. Traditional auxiliary starting methods, such as gasoline-assisted starting and PTC-assisted heating starting, tend to increase energy consumption and reduce efficiency during this process. Utility Model Content

[0004] The main purpose of this invention is to provide a preheating device, a methanol engine, and a vehicle, which aim to improve energy utilization.

[0005] To achieve the above objectives, the present invention proposes a preheating device for heating fuel in the fuel tank of an engine, wherein the engine further includes an exhaust pipe, and the preheating device comprises:

[0006] A vent pipe, one end of which is connected to the exhaust pipe;

[0007] An exhaust pipe and a heat exchanger are provided, wherein the exhaust pipe is connected to the other end of the guide pipe via the heat exchanger, the exhaust pipe is connected to the exhaust pipe and located between the exhaust pipe and the exhaust pipe's exhaust gas discharge end, and the heat exchanger is built into the oil tank; and

[0008] An air pump is used to introduce the high-temperature exhaust gas from the exhaust pipe into the heat exchange device.

[0009] In one embodiment, the oil tank is equipped with an oil pump suction device, and the heat exchange device is located close to the oil pump suction device.

[0010] In one embodiment, the heat exchange device is configured as a spiral tube, which is arranged around the outer periphery of the oil pump suction device;

[0011] And / or, the heat exchange device is a copper tube.

[0012] In one embodiment, the oil tank is equipped with a temperature sensor, and the preheating device further includes a control module, wherein the temperature sensor and the air pump are electrically connected to the control module.

[0013] In one embodiment, the temperature sensor is located in the oil pump suction device;

[0014] Alternatively, the temperature sensor may be located in the heat exchange device.

[0015] In one embodiment, the air pump is located in the air duct.

[0016] In one embodiment, the exhaust pipe is provided with a one-way valve, and the one-way valve is configured to open in the direction from the heat exchange device toward the exhaust pipe.

[0017] In one embodiment, the diameter of the air guide tube is larger than the diameter of the air outlet tube;

[0018] And / or, the fuel tank is a methanol tank.

[0019] This invention also proposes a methanol engine, which includes the preheating device described above.

[0020] This utility model also proposes a vehicle that includes the methanol engine described above.

[0021] In the technical solution of this utility model, an air guide pipe and an exhaust pipe are connected externally at intervals on the exhaust pipe of the engine. The air guide pipe and the exhaust pipe are connected by a heat exchange device, which is located inside the fuel tank. Thus, under the driving action of the air pump, the high-temperature exhaust gas in the exhaust pipe can be introduced into the heat exchange device through the air guide pipe. The exhaust gas located in the heat exchange device uses residual heat to preheat the fuel in the fuel tank. After heat exchange, it returns to the exhaust pipe through the exhaust pipe and is then discharged into the atmosphere. This helps to reduce energy consumption during auxiliary start-up and improves energy utilization. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of an embodiment of the preheating device provided by this utility model.

[0024] Explanation of icon numbers:

[0025] 11. Fuel tank; 12. Exhaust pipe; 121. Exhaust gas discharge end; 13. Air guide pipe; 14. Air outlet pipe; 15. Heat exchange device; 16. Air pump; 17. Temperature sensor; 18. One-way valve.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] Existing engines generally suffer from poor starting performance, especially methanol engines, which are particularly difficult to start in low-temperature environments.

[0031] Because methanol has a high latent heat of vaporization, it needs to absorb a large amount of heat to form a combustible mixture. Traditional auxiliary starting methods, such as gasoline-assisted starting and PTC-assisted heating starting, tend to increase energy consumption and reduce efficiency during this process.

[0032] To solve this technical problem, this utility model proposes a preheating device for heating the fuel in the fuel tank 11 of an engine, which also includes an exhaust pipe 12.

[0033] Please see Figure 1In one embodiment of this utility model, the preheating device includes a gas guide pipe 13, a gas outlet pipe 14, a heat exchange device 15, and a gas pump 16. One end of the gas guide pipe 13 is connected to the exhaust pipe 12; the gas outlet pipe 14 is connected to the other end of the gas guide pipe 13 through the heat exchange device 15, and the gas outlet pipe 14 is connected to the exhaust pipe 12 and located between the exhaust gas discharge end 121 of the gas guide pipe 13 and the exhaust pipe 12. The heat exchange device 15 is built into the oil tank 11; the gas pump 16 is used to introduce the high-temperature exhaust gas in the exhaust pipe 12 into the heat exchange device 15; this helps to improve energy utilization.

[0034] In the technical solution of this utility model, an air guide pipe 13 and an exhaust pipe 14 are externally connected to the exhaust pipe 12 of the engine at intervals. The air guide pipe 13 and the exhaust pipe 14 are connected by a heat exchange device 15. The heat exchange device 15 is installed inside the fuel tank 11. Thus, under the driving action of the air pump 16, the high-temperature exhaust gas in the exhaust pipe 12 can be introduced into the heat exchange device 15 through the air guide pipe 13. The exhaust gas located in the heat exchange device 15 uses residual heat to preheat the fuel in the fuel tank 11. After heat exchange, it returns to the exhaust pipe 12 through the exhaust pipe 14 and is then discharged into the atmosphere. This helps to reduce energy consumption during auxiliary start-up and improve energy utilization.

[0035] It should be emphasized that, compared with the traditional heat exchange method that uses multiple heat exchange links to achieve heat exchange, the heat exchange device 15 of this utility model is directly installed in the oil tank 11, and the heat exchange device 15 is connected to the exhaust pipe 12 to form a loop, which facilitates the direct heating of fuel with high-temperature exhaust gas. Moreover, only one heat exchange is required, which can effectively reduce heat loss by about 30%, thereby significantly improving the overall energy utilization rate.

[0036] Specifically, the air guide pipe 13 and the air outlet pipe 14 are arranged at intervals on the exhaust pipe 12, and the air outlet pipe 14 is set close to the exhaust gas discharge end 121 to ensure that the high temperature exhaust gas in the exhaust pipe 12 first enters the preheating device through the air guide pipe 13, and then is discharged back to the exhaust pipe 12 through the air outlet pipe 14 and discharged into the atmosphere.

[0037] The air pump 16 can be connected in series with the air guide pipe 13 or the air outlet pipe 14 using a clamping or other installation method to push the high-temperature exhaust gas through the air guide pipe 13 into the heat exchange device 15 for preheating. The air pump 16 can be configured as a high-pressure air pump 16, which drives the high-temperature exhaust gas to flow in the flow path of air guide pipe 13-heat exchange device 15-air outlet pipe 14. Under normal operation, the pressure range of the high-pressure air pump 16 is 0.8 to 1.2 MPa, ensuring that the exhaust gas passes through the flow path quickly, and at the same time, realizing the heating of the fuel in the oil tank 11 by the waste heat of the exhaust gas.

[0038] The heat exchange device 15 can be configured as a tubular structure, wherein the heat exchange device 15 can be made of a material with high thermal conductivity to ensure the heat exchange efficiency between the exhaust gas and the fuel. In one embodiment, the heat exchange device 15 is a copper tube. Copper has a thermal conductivity much higher than most metals, which can significantly reduce the thermal resistance of the tube wall and improve the heat exchange efficiency. In addition, copper tubes are flexible, ductile, and easy to bend, which facilitates the processing of the heat exchange device 15.

[0039] The preheating device can be detachably installed on the engine. Specifically, the air guide pipe 13, the air outlet pipe 14 and the exhaust pipe 12 can be connected by a special clamp or other fastening structure; the heat exchange device 15 can be fixedly installed inside the oil tank 11 by screws or other fastening structures.

[0040] Optionally, in an embodiment of this utility model, the oil tank 11 is provided with an oil pump suction device, and the heat exchange device 15 is arranged close to the oil pump suction device. The oil pump suction device is located at the oil outlet of the oil tank 11. Specifically, the oil pump suction device can be the suction pipe between the oil pump and the oil tank 11. By arranging the heat exchange device 15 close to the oil pump suction device, it can be ensured that the fuel output from the oil tank 11 is preheated by the waste heat of the exhaust gas. When the fuel is methanol, it can significantly improve cold start and warm-up emissions, and also help to improve the overall thermal efficiency and reduce specific fuel consumption.

[0041] Specifically, in an embodiment of this utility model, the heat exchange device 15 is configured as a spiral tube, which is arranged around the outer periphery of the oil pump suction device; it can be understood that, as Figure 1 As shown, the heat exchange device 15 is spiral-shaped, which can extend the flow path of the exhaust gas, specifically up to 2.5 times that of conventional designs. At the same time, it helps to increase the effective contact area between the fuel in the oil tank 11 and the heat exchange device 15, specifically increasing the contact area by more than 40%, thereby achieving efficient heat transfer and fully heating the fuel in the oil tank 11, thus improving the heat utilization rate.

[0042] Optionally, in an embodiment of this utility model, a temperature sensor 17 is provided on the fuel tank 11, and the preheating device further includes a control module. The temperature sensor 17 and the air pump 16 are electrically connected to the control module. The temperature sensor 17 is used to detect the temperature of the fuel in the fuel tank 11. Since the temperature sensor 17 and the air pump 16 are electrically connected to the control module, when the fuel temperature detected by the temperature sensor 17 reaches the standard, the control module controls the air pump 16 to shut down, stopping the delivery of high-temperature exhaust gas to the heat exchange device 15, thereby avoiding the problem of excessively high fuel temperature. When the temperature sensor 17 detects that the fuel temperature drops, or even falls below the standard line, the control module controls the air pump 16 to turn on, pushing the high-temperature exhaust gas in the exhaust pipe 12 to the heat exchange device 15 again, so as to achieve the purpose of using the waste heat of the exhaust gas to heat the fuel.

[0043] Specifically, because the heat exchange device 15 is located near the oil pump suction device, and the temperature sensor 17 is located near the oil pump suction device, it is to ensure that the detected fuel temperature is the fuel temperature after heat exchange. In this embodiment of the present invention, the temperature sensor 17 is located on the oil pump suction device; or, the temperature sensor 17 is located on the heat exchange device 15, which helps to improve the detection accuracy of the temperature sensor 17, ensure that the temperature of the fuel in the output oil tank 11 can reduce the difficulty of cold start, and at the same time reduce the energy consumption during auxiliary start.

[0044] Please see Figure 1 In an embodiment of this utility model, a one-way valve 18 is provided on the exhaust pipe 14. The conduction direction of the one-way valve 18 is configured to be from the heat exchange device 15 toward the exhaust pipe 12. This can control the flow direction of the exhaust gas and prevent the formation of a negative pressure zone at the connection between the exhaust pipe 14 and the exhaust pipe 12 due to the pressure inside the exhaust pipe 12 or the volume contraction after heat exchange of the high-temperature exhaust gas, which would cause the exhaust gas in the exhaust pipe 12 to flow back to the exhaust pipe 14 and affect the heat exchange effect.

[0045] The minimum opening pressure difference of the one-way valve 18 can be 0.05 MPa. That is, the valve will only open and allow the waste gas in the outlet pipe 14 to flow in the forward direction when the pressure on the inlet side of the one-way valve 18 is 0.05 MPa higher than that on the outlet side. When the pressure difference is lower than this value or reverse flow occurs, the valve remains closed to prevent backflow. The one-way valve 18 can be connected in series with the outlet pipe 14 by means of installation such as clamp fixing.

[0046] Please see Figure 1 In an embodiment of this utility model, the diameter of the air guide pipe 13 is larger than the diameter of the air outlet pipe 14. It can be understood that when the heat exchange device 15 is configured as a tubular structure, its diameter is smaller than the diameter of the air guide pipe 13. This can be that the diameter of the heat exchange device 15 is the same as the diameter of the air outlet pipe 14, or the diameter of the heat exchange device 15 is larger than the diameter of the air outlet pipe 14 and smaller than the diameter of the air guide pipe 13.

[0047] The air pump 16 can actively control the flow rate and pressure of the high-temperature exhaust gas. Because the diameter of the air guide pipe 13 is relatively large, it can reduce the resistance when the exhaust gas enters, avoid overloading the air pump 16 or generating unnecessary pressure drop, and improve the controllability of the entire heat exchange system. Since the diameter of the heat exchange device 15 and the diameter of the exhaust pipe 14 are both smaller than the diameter of the air guide pipe 13, the flow velocity of the exhaust gas can be increased when it enters the heat exchange device 15, forming a velocity gradient and enhancing heat exchange. That is, although the residence time of the high-temperature exhaust gas in the heat exchange device 15 is shortened, the heat transfer coefficient can be increased, and more heat can be transferred per unit time, which helps to improve the heat exchange efficiency.

[0048] Optionally, in an embodiment of this utility model, the oil tank 11 is a methanol tank used to store methanol. Thus, under the driving action of the air pump 16, the high-temperature exhaust gas in the exhaust pipe 12 can be introduced into the heat exchange device 15 through the air guide pipe 13. The exhaust gas in the heat exchange device 15 uses residual heat to preheat the methanol in the oil tank 11, achieving the effect of methanol preheating. The exhaust gas after passing through the heat exchange device 15 returns to the exhaust pipe 12 through the one-way valve 18 and is then discharged into the atmosphere.

[0049] This utility model also proposes a methanol engine, which includes a preheating device. The specific structure of the preheating device is as described in the above embodiments. Since this methanol engine adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0050] This utility model also proposes a vehicle, which includes a methanol engine. The specific structure of the methanol engine is as described in the above embodiments. Since this vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0051] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A preheating device for heating fuel in an engine's fuel tank, the engine further comprising an exhaust pipe, characterized in that, The preheating device includes: A vent pipe, one end of which is connected to the exhaust pipe; An exhaust pipe and a heat exchanger are provided, wherein the exhaust pipe is connected to the other end of the guide pipe via the heat exchanger, the exhaust pipe is connected to the exhaust pipe and located between the exhaust pipe and the exhaust pipe's exhaust gas discharge end, and the heat exchanger is built into the oil tank; and An air pump is used to introduce the high-temperature exhaust gas from the exhaust pipe into the heat exchange device.

2. The preheating device as described in claim 1, characterized in that, The oil tank is equipped with an oil pump suction device, and the heat exchange device is located close to the oil pump suction device.

3. The preheating device as described in claim 2, characterized in that, The heat exchange device is configured as a spiral tube, which is arranged around the outer periphery of the oil pump suction device. And / or, the heat exchange device is a copper tube.

4. The preheating device as described in claim 2, characterized in that, The oil tank is equipped with a temperature sensor, and the preheating device also includes a control module. The temperature sensor and the air pump are electrically connected to the control module.

5. The preheating device as described in claim 4, characterized in that, The temperature sensor is located in the oil pump suction device; Alternatively, the temperature sensor may be located in the heat exchange device.

6. The preheating device as described in claim 1, characterized in that, The air pump is located in the air delivery pipe.

7. The preheating device as described in claim 1, characterized in that, The exhaust pipe is equipped with a one-way valve, and the one-way valve is configured to open in the direction from the heat exchange device toward the exhaust pipe.

8. The preheating device as described in claim 1, characterized in that, The diameter of the air guide tube is larger than the diameter of the air outlet tube; And / or, the fuel tank is a methanol tank.

9. A methanol engine, characterized in that, Includes the preheating device as described in any one of claims 1 to 8.

10. A vehicle, characterized in that, Including the methanol engine as described in claim 9.

Images