Preheating system and engineering machinery

Abstract

The invention discloses a preheating system and engineering machinery. The preheating system comprises a preheating module and a first oil supply module, the preheating module communicates with the first oil supply module, and the first oil supply module is used for controlling hydraulic oil circulation when the oil temperature of hydraulic oil of the first oil supply module is larger than a first preset temperature; the preheating module is used for obtaining and storing heat in the hydraulic oil when the hydraulic oil circulates; the second oil supply module is communicated with the engine and is used for supplying oil to the engine; the preheating module wraps at least part of the second oil supply module and is used for preheating fuel oil in the second oil supply module. According to the embodiment of the invention, the energy consumption of the preheating system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a preheating system and engineering machinery. Background Art

[0002] In some cold areas, fuel is prone to waxing and clogging the oil circuit in low temperature environments, so the engine fuel needs to be preheated before starting the engine.

[0003] However, existing preheating systems primarily rely on electric heating and coolant heating. Electric heating relies on batteries, resulting in slow heating and significant battery drain. Coolant heating can only be achieved by covering the heat with an electric blanket, without shutting down the engine, resulting in high fuel consumption. Consequently, existing preheating systems consume a significant amount of energy. Summary of the Invention

[0004] The present invention provides a preheating system and engineering machinery to solve the problem of high energy consumption of the preheating system.

[0005] According to one aspect of the present invention, there is provided a preheating system comprising:

[0006] a preheating module and a first oil supply module, the preheating module being in communication with the first oil supply module, the first oil supply module being configured to control the circulation of the hydraulic oil when the temperature of the hydraulic oil in the first oil supply module is greater than a first preset temperature; the preheating module being configured to obtain and store heat from the hydraulic oil during circulation of the hydraulic oil;

[0007] The second fuel supply module is connected to the engine and is used to supply fuel to the engine; the preheating module wraps at least a portion of the second fuel supply module, and the preheating module is used to preheat the fuel in the second fuel supply module.

[0008] Optionally, the preheating module includes:

[0009] a phase change material device layer, the phase change material device layer wrapping at least a portion of the second fuel supply module; the phase change material device layer being used to preheat the fuel in the second fuel supply module;

[0010] A heating pipeline, wherein the input end of the heating pipeline is connected to the oil supply end of the first oil supply module, and the output end of the heating pipeline is connected to the oil return end of the first oil supply module; the heating pipeline wraps at least a portion of the phase change material device layer; the heating pipeline is used to circulate the hydraulic oil in the first oil supply module; the phase change material device layer is used to obtain and store the heat of the hydraulic oil in the heating pipeline.

[0011] Optionally, the preheating module further includes:

[0012] A thermal insulation layer wraps the phase change material device layer, the heating pipeline and the second oil supply module, and the thermal insulation layer is used to maintain the internal temperature of the preheating module.

[0013] Optionally, the phase change material device layer includes: composite phase change material microcapsules; the interior of the composite phase change material microcapsules includes: at least one of paraffin, graphene, nanosilver and multi-walled carbon nanotubes; the outer wall of the composite phase change material microcapsules includes: melamine-urea-formaldehyde resin.

[0014] Optionally, the second oil supply module includes:

[0015] a main fuel tank and a subsidiary fuel tank, wherein the main fuel tank is in communication with the subsidiary fuel tank and supplies fuel to the engine through the subsidiary fuel tank; the capacity of the main fuel tank is greater than that of the subsidiary fuel tank;

[0016] The preheating module wraps at least a portion of the auxiliary fuel tank, and the preheating module is used to preheat the fuel in the auxiliary fuel tank.

[0017] Optionally, the thermal insulation layer wraps one side of the auxiliary fuel tank, and the phase change material device layer wraps the other side of the auxiliary fuel tank;

[0018] The thermal insulation layer also wraps the phase change material device layer; the heating pipeline is sandwiched between the thermal insulation layer and the phase change material device layer.

[0019] Optionally, the first oil supply module includes: a hydraulic oil tank and a hydraulic circulation pump;

[0020] The oil supply end of the hydraulic oil tank is communicated with the input end of the hydraulic circulation pump, and the output end of the hydraulic circulation pump is communicated with the input end of the heating pipeline.

[0021] Optionally, the first oil supply module further comprises: a back pressure valve, a relief valve and an overload check valve;

[0022] The output end of the heating pipeline is connected to the return oil end of the hydraulic oil tank through a back pressure valve; the back pressure valve is used to prevent the hydraulic oil tank from outputting the hydraulic oil through the return oil end;

[0023] The input end of the relief valve is communicated with the output end of the hydraulic circulation pump, and the output end of the relief valve is communicated with the input end of the heating pipeline. The relief valve is used to maintain the pressure of the hydraulic oil input into the heating pipeline;

[0024] The input end of the overload one-way valve is connected to the output end of the hydraulic circulating pump, and the output end of the overload one-way valve is connected to the overload input end of the hydraulic oil tank; the overload one-way valve is used to conduct when the pressure of the heating pipeline is greater than a preset pressure threshold, and input the hydraulic oil output by the hydraulic circulating pump into the hydraulic oil tank.

[0025] Optionally, the first oil supply module also includes: a temperature sensor; arranged on the surface of the hydraulic oil tank, for detecting the temperature of the hydraulic oil; the hydraulic circulation pump is used to extract the hydraulic oil and circulate the hydraulic oil through the heating pipeline when the oil temperature of the hydraulic oil is greater than the first preset temperature.

[0026] According to another aspect of the present invention, there is provided an engineering machine comprising: the preheating system provided by any embodiment of the present invention.

[0027] The technical solution provided by the embodiments of the present invention utilizes a preheating module to capture the heat of the hydraulic oil in the first oil supply module and preheat the fuel in the second oil supply module. This arrangement improves energy utilization and reduces resource waste. This eliminates the need for electric heating devices such as electric blankets and heaters, resulting in better temperature controllability. Furthermore, there is no need for a new power source, resulting in lower energy consumption and higher safety.

[0028] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a structural schematic diagram of a preheating system provided according to an embodiment of the present invention;

[0031] Figure 2 is a structural schematic diagram of another preheating system provided according to an embodiment of the present invention;

[0032] Figure 3 is a structural schematic diagram of another preheating system provided according to an embodiment of the present invention;

[0033] Figure 4 is a cross-sectional view of a preheating module provided according to an embodiment of the present invention;

[0034] Figure 5 2 is a structural diagram of another preheating system provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] An embodiment of the present invention provides a preheating system. Figure 1 This is a schematic diagram of the structure of a preheating system provided by an embodiment of the present invention. Figure 1 The preheating system includes a preheating module 3, a first fuel supply module 1, and a second fuel supply module 2. The preheating module 3 is connected to the first fuel supply module 1 and is used to control the circulation of the hydraulic oil when the temperature of the hydraulic oil in the first fuel supply module 1 is greater than a first preset temperature. The preheating module 3 is used to capture and store heat from the hydraulic oil during circulation. The second fuel supply module 2 is connected to the engine 4 and is used to supply fuel to the engine 4. The preheating module 3 encloses at least a portion of the second fuel supply module 2 and is used to preheat the fuel in the second fuel supply module 2.

[0038] The second fuel supply module 2 is used to supply fuel to the engine 4 for operation. However, when the outside temperature is low, the fuel can easily wax and clog the oil circuit. This is particularly true in winter at high altitudes, where the engine 4 is shut down at night or during maintenance. The low temperature of the fuel in the second fuel supply module 2 may prevent the engine 4 from operating properly. Therefore, the fuel in the second fuel supply module 2 must be preheated before the engine 4 is put into operation. For example, the fuel can be diesel.

[0039] The first oil supply module 1 is used to store and output hydraulic oil for the operation of hydraulic equipment. For example, the hydraulic equipment can be mechanical equipment such as an excavator bucket, a loader bucket, and a crane arm. Because the hydraulic oil generates significant heat during operation, the heat in the hydraulic oil is used to preheat the fuel in the second oil supply module 2.

[0040] Specifically, when the temperature of the hydraulic oil of the first oil supply module 1 is greater than the first preset temperature, the first oil supply module 1 circulates the hydraulic oil and collects and stores the heat in the hydraulic oil through the preheating module 3 .

[0041] For example, preheating module 3 may include a phase-change material (PCM). The PCM is solid at room temperature. When the PCM absorbs heat, it changes from solid to liquid and flows through preheating module 3, thereby storing heat. When the fuel in second fuel supply module 2 is at a low temperature, the PCM changes from liquid to solid again upon cooling. During this process, the PCM releases a significant amount of heat, preheating the fuel in second fuel supply module 2. When engine 4 is started, the preheated fuel can be fed into engine 4, ensuring reliable operation.

[0042] The technical solution provided by the embodiments of the present invention utilizes a preheating module to capture the heat of the hydraulic oil in the first oil supply module and preheat the fuel in the second oil supply module. This arrangement improves energy utilization and reduces resource waste. This eliminates the need for electric heating devices such as electric blankets and heaters, resulting in better temperature controllability. Furthermore, there is no need for a new power source, resulting in lower energy consumption and higher safety.

[0043] Figure 2 This is a schematic diagram of another preheating system provided by an embodiment of the present invention. Figure 2Based on the above embodiments, the preheating module 3 optionally includes a phase change material device layer 31 and a heating pipeline 32. The phase change material device layer 31 encapsulates at least a portion of the second fuel supply module 2; the phase change material device layer 31 is used to preheat the fuel in the second fuel supply module 2. The input end of the heating pipeline 32 is connected to the fuel supply end of the first fuel supply module 1, and the output end of the heating pipeline 32 is connected to the fuel return end of the first fuel supply module 1. The heating pipeline 32 encapsulates at least a portion of the phase change material device layer 31. The heating pipeline 32 is used to circulate the hydraulic oil in the first fuel supply module 1; the phase change material device layer 31 is used to extract and store heat from the hydraulic oil in the heating pipeline 32.

[0044] Among them, when the oil temperature of the hydraulic oil of the first oil supply module 1 is greater than the first preset temperature, the oil supply end of the first oil supply module 1 outputs the hydraulic oil through the heating pipeline 32, and returns the oil through the return oil end of the first oil supply module 1, thereby circulating the hydraulic oil.

[0045] The heating pipe 32 is made of a material with good thermal conductivity and can exchange heat with the phase change material device layer 31. For example, the heating pipe 32 can be wrapped around and enclosed by the phase change material device layer 31. This arrangement can improve the ability of the heating pipe 32 to transfer heat and the phase change material device layer 31 to absorb heat.

[0046] When the heating pipeline 32 transmits hydraulic oil, the phase change material device layer 31 absorbs and stores the heat of the hydraulic oil in the heating pipeline 32. When the fuel temperature in the second fuel supply module 2 is low, the phase change material device layer 31 releases heat to the second fuel supply module 2 to preheat it.

[0047] The embodiment of the present invention realizes the transmission of hydraulic oil and storage of heat of hydraulic oil by providing a heating pipeline and a phase change material device layer, without the need for additional electric heating equipment, and has lower energy consumption and higher safety.

[0048] Continue to refer Figure 2 On the basis of the above embodiments, optionally, the preheating module further includes: an insulation layer 33, the insulation layer 33 wraps the phase change material device layer 31, the heating pipeline 32 and the second oil supply module 2, and the insulation layer 33 is used to maintain the internal temperature of the preheating module.

[0049] To prevent heat loss from the phase-change material device layer 31 and the heating pipe 32, an insulation layer 33 is provided to encase the phase-change material device layer 31, the heating pipe 32, and the second fuel supply module 2, thereby concentrating the heat within the insulation layer 33. After the phase-change material device layer 31 preheats the second fuel supply module 2, the insulation layer 33 also insulates the fuel in the second fuel supply module 2, thereby enhancing the preheating effect of the preheating module.

[0050] Based on the above embodiments, optionally, the phase change material device layer includes: composite phase change material microcapsules; the interior of the composite phase change material microcapsules includes: at least one of paraffin, graphene, nanosilver and multi-walled carbon nanotubes; the outer wall of the composite phase change material microcapsules includes: melamine-urea-formaldehyde resin.

[0051] Composite phase-change material microcapsules are functional materials made by microencapsulating composite phase-change materials. These microcapsules, with their melamine-urea-formaldehyde resin outer walls, effectively encapsulate the phase-change material, preventing leakage and contact with the external environment, thereby increasing its stability and service life.

[0052] Exemplarily, the continuous exothermic temperature phase change point of the phase change material composed of paraffin, graphene, nanosilver and multi-walled carbon nanotubes inside the composite phase change material microcapsule can be 25°C-35°C, that is, when the inside of the composite phase change material microcapsule is in a solid state at less than 25°C, at this time, the composite phase change material microcapsule does not release heat. When the temperature of the composite phase change material microcapsule slowly increases, the inside of the composite phase change material microcapsule stores heat and changes from solid to semi-solid.

[0053] The phase change temperature of the phase change material inside the composite phase change material microcapsule can be 75℃-85℃, that is, when the temperature inside the composite phase change material microcapsule is greater than 85℃, it is completely in liquid state. At this time, the heat storage capacity of the composite phase change material microcapsule reaches the maximum value, and it has a better heat release effect.

[0054] For example, the heat stored in the phase change material device layer can generally be maintained for 4-6 hours. If the engine is shut down for too long, the phase change material device layer may not function properly. In this case, the phase change material device layer can be removed and stored. Before the engine is started, the phase change material device layer can be externally heated and put back into use.

[0055] Figure 3 This is a structural diagram of another preheating system provided by an embodiment of the present invention. Figure 3 Based on the above embodiments, the second fuel supply module optionally includes a main fuel tank 21 and a secondary fuel tank 22. The main fuel tank 21 is connected to the secondary fuel tank 22 and supplies fuel to the engine 4 through the secondary fuel tank 22. The capacity of the main fuel tank 21 is greater than that of the secondary fuel tank 22. The preheating module 3 encloses at least a portion of the secondary fuel tank 22 and is used to preheat the fuel in the secondary fuel tank 22.

[0056] Because the second fuel supply module 2 has a larger capacity, it may not be able to preheat all the fuel to the appropriate temperature during preheating. Therefore, by providing a main fuel tank 21 and a secondary fuel tank 22, the preheating module 3 can preheat the fuel in the secondary fuel tank 22. Because the capacity of the secondary fuel tank 22 is smaller than that of the main fuel tank 21, preheating the secondary fuel tank 22 alone has a better preheating effect.

[0057] When the engine 4 is started, the fuel in the auxiliary fuel tank 22 is first input into the engine 4. Since the fuel in the auxiliary fuel tank 22 has been preheated by the preheating module 3, the engine 4 can receive fuel in a relatively good temperature state, so that the engine 4 can start normally, thereby improving the starting effect of the engine 4.

[0058] Figure 4 A cross-sectional view of a preheating module provided in an embodiment of the present invention. Figure 3 and Figure 4 Based on the above embodiments, optionally, the insulation layer 33 wraps one side of the auxiliary fuel tank 22, and the phase change material device layer 31 wraps the other side of the auxiliary fuel tank 22. The insulation layer 33 also wraps the phase change material device layer 31; the heating pipeline 32 is interposed between the insulation layer 33 and the phase change material device layer 31.

[0059] Among them, the phase change material device layer 31 is used to store phase change material. One side of the phase change material device layer 31 is arranged close to the heating pipeline 32. When the heating pipeline 32 circulates hydraulic oil, the phase change material device layer 31 absorbs heat in the heating pipeline 32 and stores the heat.

[0060] When the fuel temperature in the second fuel supply module 2 is low, the phase change material device layer 31 releases heat to the auxiliary fuel tank 22, thereby preheating the fuel therein. For example, the insulation layer 33 can wrap around one side of the auxiliary fuel tank 22, while the phase change material device layer 31 can wrap around the remaining five sides. In this case, the phase change material device layer 31 achieves the best preheating effect on the auxiliary fuel tank 22. In actual applications, the phase change material device layer 31 can be adapted to wrap around one, two, or multiple sides of the auxiliary fuel tank 22.

[0061] When the engine 4 is in a low temperature environment, after the engine 4 has stopped working for a period of time, if low-temperature fuel is directly input into the engine 4, wax deposition may cause blockage of the oil circuit in the engine 4. The present invention transfers part of the hydraulic oil in the first oil supply module 1 to the heat supply pipeline 32, and the phase change material in the phase change material device layer 31 absorbs heat, causing the oil to change from a solid state to a liquid state, thereby storing heat.

[0062] Before engine 4 starts, when the fuel in auxiliary fuel tank 22 is relatively cold, the phase change material in phase change material device layer 31 slowly changes from liquid to solid, continuously releasing heat during this process, maintaining the fuel in auxiliary fuel tank 22 at a constant temperature. When engine 4 starts, auxiliary fuel tank 22 can then supply the warmed fuel to the engine. This arrangement ensures sufficient combustion of the fuel even when engine 4 is cold, resulting in a highly reliable startup process.

[0063] Figure 5 This is a structural diagram of another preheating system provided by an embodiment of the present invention. Figure 5 Based on the above embodiments, optionally, the first oil supply module includes: a hydraulic oil tank 11 and a hydraulic circulation pump 12. The oil supply end of the hydraulic oil tank 11 is connected to the input end of the hydraulic circulation pump 12, and the output end of the hydraulic circulation pump 12 is connected to the input end of the heating pipeline 32.

[0064] The hydraulic oil tank 11 is used to store hydraulic oil. When the temperature of the hydraulic oil is greater than a first preset temperature, the hydraulic circulating pump 12 is activated and pumps the hydraulic oil in the hydraulic oil tank 11 into the heating pipeline 32. For example, the hydraulic circulating pump 12 can be connected to a generator to provide a power source for the hydraulic circulating pump 12.

[0065] Continue to refer Figure 5 Based on the above embodiments, the first oil supply module 1 optionally further includes a backpressure valve 13, a relief valve 14, and an overload check valve 15. The output end of the heating pipeline 32 is connected to the return oil end of the hydraulic oil tank 11 via the backpressure valve 13. The backpressure valve 13 is used to prevent the hydraulic oil tank 11 from discharging hydraulic oil through the return oil end. The input end of the relief valve 14 is connected to the output end of the hydraulic circulation pump 12, and the output end of the relief valve 14 is connected to the input end of the heating pipeline 32. The relief valve 14 is used to maintain the pressure of the hydraulic oil entering the heating pipeline 32. The input end of the overload check valve 15 is connected to the output end of the hydraulic circulation pump 12, and the output end of the overload check valve 15 is connected to the overload input end of the hydraulic oil tank 11. The overload check valve 15 is designed to open when the pressure in the heating pipeline 32 exceeds a preset pressure threshold, allowing the hydraulic oil output from the hydraulic circulation pump 12 to be input into the hydraulic oil tank 11.

[0066] The back-pressure valve 13 is unidirectional. When the hydraulic circulating pump 12 is running, the hydraulic oil in the heating line 32 can be re-injected into the hydraulic oil tank 11 through the back-pressure valve 13. When the hydraulic circulating pump 12 stops running, the back-pressure valve 13 prevents the hydraulic oil in the hydraulic oil tank 11 from flowing back into the heating line 32. This arrangement maintains the stability of the hydraulic oil in the heating line 32, allowing the high-temperature hydraulic oil to be stored in the heating line 32, preventing the hydraulic oil from dissipating and losing heat.

[0067] The overflow valve 14 is connected to the output end of the hydraulic circulation pump 12 and can be used to maintain the pressure of the hydraulic oil input into the heating pipeline 32 by the hydraulic circulation pump 12.

[0068] For example, when the pressure of the hydraulic oil in the heating line 32 is lower than the set pressure of the relief valve 14, the valve core of the relief valve 14 is closed, and hydraulic oil is input into the heating line 32, providing pressure for the heating line 32. When the pressure of the hydraulic oil in the heating line 32 rises to the set pressure of the relief valve 14, the hydraulic pressure acting on the valve core exceeds the spring force, and the valve core opens, thereby limiting the further increase in the pressure of the hydraulic oil in the heating line 32 and stabilizing the pressure in the heating line 32 near the set value of the relief valve 14.

[0069] If the heating line 32 becomes clogged during the hydraulic oil transfer process, continuing to pump hydraulic oil from the hydraulic circulation pump 12 could result in excessive pressure in the heating line 32, potentially leading to a burst. The overload check valve 15 opens when the pressure in the heating line 32 is too high, allowing the hydraulic oil from the hydraulic circulation pump 12 to flow back through the overload check valve 15 to the hydraulic oil tank 11, thereby ensuring the safety of the heating line 32.

[0070] Continue to refer Figure 5 On the basis of the above embodiments, optionally, the first oil supply module 1 further includes: a temperature sensor 16; arranged on the surface of the hydraulic oil tank 11, for detecting the temperature of the hydraulic oil; a hydraulic circulation pump 12 for extracting the hydraulic oil and circulating the hydraulic oil through the heating pipeline 32 when the oil temperature of the hydraulic oil is greater than the first preset temperature.

[0071] For example, the first preset temperature can be 40°C. When the temperature of the hydraulic oil exceeds the first preset temperature, the hydraulic circulation pump 12 draws the hydraulic oil from the hydraulic oil tank 11. At this point, the phase change material device layer absorbs heat from the hydraulic oil in the heating pipeline 32, and the phase change material in the phase change material device layer converts from a solid state to a liquid state, storing heat.

[0072] An embodiment of the present invention further provides a construction machine. The construction machine includes: the preheating system provided by any embodiment of the present invention. For example, the construction machine may include an excavator, a bulldozer, a loader, a crane, or other mechanical equipment.

[0073] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0074] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A preheating system, characterized in that: include: a preheating module and a first oil supply module, the preheating module being in communication with the first oil supply module, the first oil supply module being configured to control the circulation of the hydraulic oil when the temperature of the hydraulic oil in the first oil supply module is greater than a first preset temperature; the preheating module being configured to obtain and store heat from the hydraulic oil during circulation of the hydraulic oil; The second fuel supply module is connected to the engine and is used to supply fuel to the engine; the preheating module wraps at least a portion of the second fuel supply module, and the preheating module is used to preheat the fuel in the second fuel supply module.

2. The preheating system according to claim 1, characterized in that The preheating module comprises: a phase change material device layer, the phase change material device layer wrapping at least a portion of the second fuel supply module; the phase change material device layer being used to preheat the fuel in the second fuel supply module; A heating pipeline, wherein the input end of the heating pipeline is connected to the oil supply end of the first oil supply module, and the output end of the heating pipeline is connected to the oil return end of the first oil supply module; the heating pipeline wraps at least a portion of the phase change material device layer; the heating pipeline is used to circulate the hydraulic oil in the first oil supply module; the phase change material device layer is used to obtain and store the heat of the hydraulic oil in the heating pipeline.

3. The preheating system according to claim 2, characterized in that: The preheating module also includes: A thermal insulation layer wraps the phase change material device layer, the heating pipeline and the second oil supply module, and the thermal insulation layer is used to maintain the internal temperature of the preheating module.

4. The preheating system according to claim 2, characterized in that The phase change material device layer includes: composite phase change material microcapsules; the interior of the composite phase change material microcapsules includes: at least one of paraffin, graphene, nanosilver and multi-walled carbon nanotubes; the outer wall of the composite phase change material microcapsules includes: melamine-urea-formaldehyde resin.

5. The preheating system according to claim 3, characterized in that: The second oil supply module includes: a main fuel tank and a subsidiary fuel tank, wherein the main fuel tank is in communication with the subsidiary fuel tank and supplies fuel to the engine through the subsidiary fuel tank; the capacity of the main fuel tank is greater than that of the subsidiary fuel tank; The preheating module wraps at least a portion of the auxiliary fuel tank, and the preheating module is used to preheat the fuel in the auxiliary fuel tank.

6. The preheating system according to claim 5, characterized in that The thermal insulation layer wraps one side of the auxiliary fuel tank, and the phase change material device layer wraps the other side of the auxiliary fuel tank; The thermal insulation layer also wraps the phase change material device layer; the heating pipeline is sandwiched between the thermal insulation layer and the phase change material device layer.

7. The preheating system according to claim 2, characterized in that The first oil supply module includes: a hydraulic oil tank and a hydraulic circulation pump; The oil supply end of the hydraulic oil tank is communicated with the input end of the hydraulic circulation pump, and the output end of the hydraulic circulation pump is communicated with the input end of the heating pipeline.

8. The preheating system according to claim 7, characterized in that: The first oil supply module further includes: a back pressure valve, a relief valve and an overload check valve; The output end of the heating pipeline is connected to the return oil end of the hydraulic oil tank through a back pressure valve; the back pressure valve is used to prevent the hydraulic oil tank from outputting the hydraulic oil through the return oil end; The input end of the relief valve is communicated with the output end of the hydraulic circulation pump, and the output end of the relief valve is communicated with the input end of the heating pipeline. The relief valve is used to maintain the pressure of the hydraulic oil input into the heating pipeline; The input end of the overload one-way valve is connected to the output end of the hydraulic circulating pump, and the output end of the overload one-way valve is connected to the overload input end of the hydraulic oil tank; the overload one-way valve is used to conduct when the pressure of the heating pipeline is greater than a preset pressure threshold, and input the hydraulic oil output by the hydraulic circulating pump into the hydraulic oil tank.

9. The preheating system according to claim 7, characterized in that: The first oil supply module also includes: a temperature sensor; arranged on the surface of the hydraulic oil tank, for detecting the temperature of the hydraulic oil; the hydraulic circulation pump is used to extract the hydraulic oil and circulate the hydraulic oil through the heating pipeline when the oil temperature of the hydraulic oil is greater than the first preset temperature.

10. An engineering machine, characterized in that: include: The preheating system according to any one of claims 1 to 9.

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