Device for heating reactant by using engine lubricating oil

Abstract

The utility model discloses a device for heating reactants by using engine lubricating oil, which comprises a liquid inlet pipe joint and a liquid outlet pipe joint which are respectively communicated with a liquid inlet pipe and a liquid outlet pipe of a heat exchanger and are respectively communicated with a lubricating oil supply pipe and a lubricating oil return pipe. The lubricating oil supply pipe and the return pipe are respectively communicated with an engine lubricating system, lubricating oil with heat is conveyed to the lubricating oil supply pipe by arranging the driving mechanism, then passes through the heat exchanger and then flows back to the engine lubricating system through the return pipe, and the heat exchanger is a coil pipe. Engine lubricating oil (engine oil) is used for replacing engine cooling liquid in an existing heating system to serve as a heating medium, and the problem that a coil pipe is frozen to crack due to the fact that a user uses water to cool an engine is completely solved.

Description

Technical Field

[0001] The utility model relates to the technical field of after-treatment of exhaust gas purification of internal combustion engines. More specifically, the utility model relates to a device for heating a reactant of an after-treatment system of exhaust gas purification of an internal combustion engine by using engine lubricating oil (engine oil). Background Art

[0002] Existing internal combustion engine exhaust purification systems, especially lean-burn internal combustion engines, such as diesel engine exhaust purification, require the addition of reactants, such as urea aqueous solution reactants (hereinafter referred to as "urea"), in the exhaust system, i.e., the after-processor, to reduce nitrogen oxides (NOx). The national standard reactant is a 32.5% urea aqueous solution. In engineering applications, the reactant is contained in a urea tank and carried on the vehicle. Under the control of the DCU (after-treatment controller), the urea pump extracts and sprays it into the after-processor, such as the SCR system, according to the vehicle engine operating conditions. However, the above national standard reactants will freeze in cold weather, such as -11°C. Therefore, a heating system is required to heat and thaw the reactants. One of the most common methods is to use engine coolant as a heating medium, by arranging a heat exchanger in the urea tank, hereinafter referred to as a "coil", and introducing the heating medium into the coil for circulation; in this way, the heat brought by the heating medium from the engine is transferred to the urea to achieve heating and freezing.

[0003] Figure 1 This is the most common urea heating schematic diagram. The heating function of this system is mainly completed by the heating unit, that is, the heat exchanger, commonly known as the coil 100; the above-mentioned coil is placed in the urea tank 200. There is urea 220 in the urea tank; the urea tank is connected to the urea tank cover 400 through a buckle 300; a heating medium inlet pipe joint 500 and a heating medium outlet pipe joint 600 are arranged inside (on) the urea tank cover, which are respectively connected to the inlet pipe and outlet pipe of the coil 100 through the flow channel inside the urea tank cover (not shown in the figure); the inlet pipe joint 500 and the outlet pipe joint 600 are respectively connected to the heating medium supply pipe 550 and the return pipe 650 at the engine end ( Figure 2 ); a switch valve 700 is arranged on the supply pipeline of the heating medium or in the flow channel in (on) the urea tank cover 400. Thus, when the urea needs to be heated, the post-treatment system controller DCU (not shown) opens the switch valve 700 so that the heating medium can continuously flow into the coil 100 to achieve heat exchange, transfer the heat of the heating medium to the urea, and heat and thaw it.

[0004] Under normal circumstances, the engine heating medium is antifreeze liquid, which will not freeze in cold weather. However, in the market, many users do not use antifreeze, but directly use natural water, such as tap water. Water can freeze when the temperature is below 0℃. When the heating medium freezes, the volume expands, causing the coil, especially the connection between the coil and the urea tank cover or the flow channel inside the urea tank cover to swell and crack, commonly known as freeze cracking.

[0005] The main problem to be solved by the utility model is to prevent the above-mentioned freezing and cracking phenomenon from occurring. To this end, the application discloses the following invention. Utility Model Content

[0006] One purpose of the utility model is to provide a device for heating a reactant using engine lubricating oil, using engine lubricating oil (motor oil) to replace the engine coolant in the above-mentioned heating system as a heating medium, completely avoiding the problem of coil freezing and cracking caused by users using water to cool the engine.

[0007] In order to solve the above technical problems, the utility model provides a device for heating a reactant using engine lubricating oil, comprising an inlet pipe joint and an outlet pipe joint respectively connected to the inlet pipe and the outlet pipe of a heat exchanger, the inlet pipe joint and the outlet pipe joint are respectively connected to the lubricating oil supply pipe and the return pipe, the lubricating oil supply pipe and the return pipe are respectively connected to the engine lubrication system, and the lubricating oil with heat is transported to the lubricating oil supply pipe by setting a driving mechanism, and then passes through the heat exchanger and then flows back to the engine lubrication system through the return pipe, and the heat exchanger is a coil.

[0008] Preferably, it also includes a switch valve, which is used to control the driving mechanism to start the delivery of lubricating oil when the reactant needs to be heated.

[0009] Preferably, the driving mechanism is an engine oil pump or a separately configured delivery pump.

[0010] Preferably, the switch valve is arranged on the lubricating oil supply pipe or return pipe or integrated in the urea tank cover.

[0011] Preferably, the diameter of the lubricating oil supply pipe is smaller than the diameter of the existing coolant supply pipe, or the opening of the switch valve is smaller than the opening of the switch valve on the existing coolant supply pipe.

[0012] Preferably, the delivery pump is arranged on the lubricating oil supply pipe or return pipe, and the delivery pump draws lubricating oil from the oil storage box at the bottom of the engine and returns the lubricating oil to the storage box.

[0013] Preferably, the delivery pump and the switch valve are integrated into an integral structure.

[0014] Preferably, the switch valve is driven to open and close by the pressure generated by the delivery pump.

[0015] Preferably, the delivery pump is a pump having both a pressurizing delivery function and a switching function, and no switching valve is provided.

[0016] Preferably, the delivery pump is a gear pump, a plunger pump, or a vane pump.

[0017] The utility model at least has the following beneficial effects:

[0018] 1. The utility model utilizes engine lubricating oil (engine oil) to replace the engine coolant in the above-mentioned heating system as the heating medium. Since the engine oil will not freeze and cause volume expansion, the problem of coil freezing and cracking caused by the user using water to cool the engine is completely avoided.

[0019] 2. The lubricating oil of the utility model can be delivered by using the existing engine oil pump, or a delivery pump specifically for delivering the oil can be configured separately.

[0020] 3. The utility model is provided with a delivery pump, and the engine oil can be drawn from the engine oil storage box at the bottom of the engine and returned to the storage box, so as to reduce the interference and influence on the existing engine lubricating oil circuit system.

[0021] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the heating system of the SCR urea aqueous solution reactant.

[0023] Figure 2 Showing the coolant line connection between the engine and the urea tank (prior art);

[0024] Figure 3 Shows the oil pipeline connection between the engine and the urea tank of the utility model;

[0025] Figure 4 and Figure 3 The same content, the difference is that a special oil delivery pump is added to the pipeline. DETAILED DESCRIPTION

[0026] In order to better understand the purpose, structure and function of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0027] It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 invention. In addition, although urea or urea solution is used as an example to illustrate the function of the metering system, the present invention is applicable to any other fluid.

[0028] The utility model discloses a device for heating a post-treatment system reactant (urea) by using engine lubricating oil (engine oil) to replace the engine coolant in the above-mentioned heating system as a heating medium. The heat of the above-mentioned engine oil is transmitted to the above-mentioned reactant through a heat exchange system. The structure of the device is similar to the above-mentioned engine coolant heating system, the only difference being that the heating medium is changed to engine oil; the engine oil supplied to the heating unit (coil) can be delivered by an existing engine oil pump, or a pump specifically for delivering engine oil can be configured separately.

[0029] The device includes an engine lubrication system and a reactant storage tank. The engine oil is introduced into the reactant storage tank (urea tank) of the post-treatment system through a pipeline, and the heat is transferred to the reactant (urea) through a heat exchanger (coil), and then flows back to the engine; a valve is arranged on the above-mentioned oil channel (liquid circuit), which is opened when the urea needs to be heated; the power for transporting the oil from the engine to the above-mentioned coil is provided by the engine oil pump.

[0030] Example 1

[0031] like Figure 1 As shown, the SCR urea aqueous solution reactant (hereinafter referred to as "urea") heating system heats the urea 220 in the urea tank 200 through a heat exchanger, namely, a coil 100. Its structure is as follows: the coil 100 is placed in the urea tank 200, and the urea 220 is in the urea tank; the coil 100 is connected with the bayonet 300 and the urea tank cover 400 to form an assembly, and is connected with the urea tank 200 through the bayonet 300; the urea tank cover 400 is provided with an oil inlet pipe joint 500 and an oil outlet pipe joint 600, which are respectively connected with the inlet pipe and the outlet pipe of the coil 100 through the flow channel (not shown) inside the urea tank cover 400; the inlet pipe joint 500 and the outlet pipe joint 600 are respectively connected with the oil supply pipe 550 and the return pipe 650 ( Figure 3 ) connected; the oil is delivered to the switch valve 700 by the oil pump (not shown) of the lubrication system of the engine 900; when the valve 700 is opened, the oil flows into the coil 100 ( Figure 1 ) and then returns to the engine 900 through the return pipe 650. The switch valve 700 can be independently arranged at any position of the oil delivery pipe 550 or the return pipe 650, or can be integrated in the urea tank cover 400.

[0032] The above device is actually exactly the same as the previous engine coolant circulation heating system, the only difference is that the coolant is replaced by engine oil. Since engine oil will not freeze and expand in volume, it avoids the coil freezing and cracking failure caused by users using water instead of antifreeze as engine coolant. The pressure and temperature of engine oil are generally slightly higher than coolant, and the heating effect is better. If necessary, the oil flow rate can be appropriately reduced through pipeline design to achieve the same effect as coolant heating. In addition, the volume of engine oil is also slightly lower than that of coolant, so appropriately reducing the oil flow rate is more suitable for its volume.

[0033] Example 2

[0034] In order to minimize the interference and impact on the existing engine lubrication system, such as Figure 4 As shown, we can add a delivery pump 800 to any part of the oil pipeline described in Example 1, such as the oil supply pipe 550, specifically for delivering oil to the coil 100. The oil can be drawn from any part of the engine lubrication system, preferably from the oil storage box at the bottom of the engine and returned to the storage box to reduce interference and influence on the lubrication oil circuit system.

[0035] In fact, the oil delivery pump 800 can also be arranged at any position of the return pipe 650 with the same effect.

[0036] Example 3

[0037] The delivery pump 800 and the switch valve in the above embodiment 2 can be integrated together, or replaced by a pump 700 having both a pressurizing delivery function and a switch function, such as Figure 3 As shown. Pumps that meet the above functions include gear pumps, plunger pumps, vane pumps, etc. When the switch valve is integrated with the delivery pump, the pressure generated by the pump can be used to drive the above switch valve (pilot type) to simplify the control circuit.

[0038] It can be understood that the present invention is described by some embodiments, and those skilled in the art know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation mode. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, other modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the illustrations shown and described here.

Claims

1. A device for heating a reactant using engine lubricating oil, characterized in that: It includes an inlet pipe joint and an outlet pipe joint respectively connected to the inlet pipe and the outlet pipe of the heat exchanger, the inlet pipe joint and the outlet pipe joint are respectively connected to the lubricating oil supply pipe and the return pipe, the lubricating oil supply pipe and the return pipe are respectively connected to the engine lubrication system, and the lubricating oil with heat is transported to the lubricating oil supply pipe by setting a driving mechanism, and then passes through the heat exchanger and then returns to the engine lubrication system through the return pipe. The heat exchanger is a coil.

2. The device for heating a reactant using engine lubricating oil according to claim 1, characterized in that: It also includes a switch valve, which is used to control the driving mechanism to start the delivery of lubricating oil when the reactant needs to be heated.

3. The device for heating a reactant using engine lubricating oil as claimed in claim 2, characterized in that: The driving mechanism is an engine oil pump or a separately configured delivery pump.

4. The device for heating a reactant using engine lubricating oil as claimed in claim 2, characterized in that: The switch valve is arranged on the lubricating oil supply pipe or the return pipe or integrated in the urea tank cover.

5. The device for heating a reactant using engine lubricating oil as claimed in claim 2, characterized in that: The diameter of the lubricating oil supply pipe is smaller than the diameter of the existing coolant supply pipe, or the opening of the switch valve is smaller than the opening of the switch valve on the existing coolant supply pipe.

6. The device for heating a reactant using engine lubricating oil as claimed in claim 3, characterized in that: The delivery pump is arranged on a lubricating oil supply pipe or a return pipe, and the delivery pump extracts lubricating oil from an oil storage box at the bottom of the engine and returns the lubricating oil to the storage box.

7. The device for heating a reactant using engine lubricating oil as claimed in claim 3, characterized in that: The delivery pump and the switch valve are integrated into an integrated structure.

8. The device for heating a reactant using engine lubricating oil as claimed in claim 7, characterized in that: The switch valve is driven to open and close by the pressure generated by the delivery pump.

9. The device for heating a reactant using engine lubricating oil as claimed in claim 3, characterized in that: The delivery pump is a pump that has both a pressurizing delivery function and a switching function, and no switching valve is provided.

10. The device for heating a reactant by using engine lubricating oil as claimed in claim 9, characterized in that: The delivery pump is a gear pump, a plunger pump or a vane pump.

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