Engine cooling system, method and working machine

Abstract

The application discloses an engine heat dissipation system, method and engineering machinery, and solves the technical problems of difficult cooling power matching of a radiator and high temperature of a power cabin affecting ECM performance and service life of an engine when a high-power engine water radiator and an intercooling radiator share a set of cooling fans. The application relates to an engine heat dissipation system, wherein the engine is arranged in a power cabin, the engine water radiator and the air inlet intercooling radiator adopt an up-down structure arrangement, the intercooling radiator is arranged inside the power cabin, the water radiator is arranged outside the power cabin, the water radiator wind guide cover adopts an inclined angle structure design, hot air is discharged upwards, hot air backflow is avoided, and the temperature of the power cabin is effectively reduced. The two radiators adopt hydraulic motor driven heat dissipation fans for independent heat dissipation, the flow of the heat dissipation motor is adjusted to realize stepless speed regulation of the fans, and reasonable control of the water temperature of the engine system, the air inlet temperature and the cabin temperature is achieved.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery, and specifically relates to an engine cooling system. Background Technology

[0002] Engines used in construction machinery, especially large construction machinery, have high power, high load rates, and generate a lot of heat, making the control of engine operating temperature particularly important. High-power engines have two cooling circuits: a high-temperature cooling circuit (HTC) for cylinder liners and other components, and a low-temperature cooling circuit (LTC) for the engine intake system. Because the two circuits have different temperature requirements—the high-temperature circuit can reach an equilibrium water temperature of over 95°C, while the low-temperature cooling circuit requires an equilibrium water temperature of less than 60°C—two independent radiators are needed for heat exchange to simultaneously meet the water temperature requirements of both cooling circuits.

[0003] Existing engine cooling systems typically use a series tandem arrangement for the engine water radiator and intercooler, housed as a single unit within the engine compartment and sharing a single cooling fan. The advantages of this system are space-saving radiator design, a compact engine compartment layout, and cost savings from a single cooling fan. However, it also has the following significant drawbacks:

[0004] 1. The engine water cooler and intercooler have different operating temperature range requirements and share a common cooling fan. The two radiators cannot be independently cooled and controlled. Therefore, it is difficult to match the cooling power of the radiators and select the appropriate design, and they are poorly adapted to the operating temperature range.

[0005] 2. Because the engine compartment is a relatively sealed environment, the heat generated by the engine needs to be drawn into the engine compartment by a cooling fan through the radiator, and then exhausted through the internal air ducts to remove the heat and lower the temperature inside the compartment. Due to the high temperature of the engine coolant, it is difficult to reduce the engine compartment temperature to the ideal range, which seriously affects the reliability and lifespan of the engine ECM.

[0006] To address the challenges of power matching, design selection, and effectively reducing engine compartment temperature during operation, a specialized design for the engine cooling system is required to ensure the engine operates in an ideal state. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of this invention is to provide an engine cooling system that solves the problems of radiator cooling power matching and design selection, reduces the temperature inside the engine compartment, keeps the engine in an ideal working state, and improves the performance and lifespan of the power system.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] This invention discloses an engine cooling system, including a power compartment, an engine, an engine intercooler radiator, an engine water radiator, and an expansion tank. The engine is mounted on a base inside the power compartment. The engine intercooler radiator is mounted on a base at the inner end of the power compartment. The outlet pipe of the engine intercooler is connected to the water inlet of the engine water pump, and the inlet pipe is connected to the outlet of the engine intercooler thermostat. The engine water radiator is mounted on the upper crossbeam at the top of the power compartment, arranged vertically above the engine intercooler. The outlet pipe of the engine water radiator is connected to the water inlet of the engine water pump, and the inlet pipe is connected to the outlet of the engine water-cooled thermostat. The expansion tank is mounted on the upper part of the engine water radiator, and the expansion pipe of the engine expansion tank is connected to the inlet pipe.

[0010] A further solution: The engine intercooler and engine water radiator both adopt suction cooling.

[0011] A further embodiment: The engine intercooler includes a heat dissipation core assembly, a shroud, a cooling fan, an upper shock absorber, and a lower shock absorber. The shroud is connected to the heat dissipation core assembly; the cooling fan is mounted on the shroud; the engine intercooler is mounted on a base and a column inside the engine compartment via a longitudinally arranged lower shock absorber and a transversely arranged upper shock absorber, respectively.

[0012] A further solution: The engine intercooler also includes a cooling motor, which is connected to the cooling fan via a splined shaft and mounted on the air guide shroud. The cooling function is achieved by dynamically adjusting the fan speed by changing the motor flow rate.

[0013] A further embodiment: the heat dissipation core assembly faces the outside of the power compartment, the cooling fan and the air guide shroud face the engine inside the power compartment, the center of the air guide shroud air duct is perpendicular to the surface of the heat dissipation core and parallel to the exhaust direction.

[0014] A further embodiment: The engine water radiator includes a heat dissipation core assembly, a shroud, a cooling fan, and a shock absorber. The shroud is connected to the heat dissipation core assembly; the cooling fan is mounted on the shroud; the engine water radiator is mounted on the top crossbeam of the engine compartment via the shock absorber, and a baffle is provided on the top of the engine compartment to completely isolate the shroud from the interior of the engine compartment.

[0015] A further solution: The engine water radiator also includes a cooling motor, which is connected to the cooling fan via a splined shaft and mounted on the air guide shroud. The cooling function is achieved by dynamically adjusting the fan speed by changing the motor flow rate.

[0016] A further solution: The air guide shroud adopts an angled structure design with a wedge-shaped cross-section that is tilted upwards. The center of the air duct of the air guide shroud has an upward tilt angle of more than 20° with the normal of the heat dissipation core assembly, so that the exhaust hot air is discharged upwards and the hot air of the heat dissipation radiator is prevented from flowing back.

[0017] This invention also discloses an engine cooling method. The engine is placed in the engine compartment, and the engine intercooler and engine water radiator are arranged in an upper and lower structure. The engine intercooler for the low-temperature circulating water circuit is placed inside the engine compartment, with the center of the air duct of the air guide perpendicular to the surface of the heat dissipation core and parallel to the exhaust direction. The engine water radiator for the high-temperature circulating water circuit is placed outside the engine compartment, with the air guide having an angled design. The center of the air guide has an upward tilt angle of more than 20° with the normal of the heat dissipation core, so that the exhaust hot air is discharged upward. The engine intercooler and engine water radiator are independently cooled by cooling fans driven by cooling motors. The stepless speed regulation of the fans is achieved by adjusting the flow rate of the cooling motors, thereby achieving reasonable control of the engine system water temperature, intake air temperature, and engine compartment temperature.

[0018] The present invention also discloses an engineering machine equipped with the above-mentioned engine cooling system.

[0019] Beneficial effects of this invention:

[0020] Compared with the prior art, the present invention separates the engine water radiator and intercooler, placing them inside and outside the engine compartment respectively, and uses two independent adjustable speed hydraulic cooling motors to drive the cooling fan for cooling, effectively solving the problem of radiator power matching design and selection and the problem of high internal temperature of the engine compartment affecting engine performance. Attached Figure Description

[0021] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic diagram of the engine cooling system of the present invention;

[0024] Figure 2 This is a schematic diagram of the engine water radiator assembly of the present invention;

[0025] Figure 3 This is a schematic diagram of the engine intercooler assembly of the present invention;

[0026] Figure 4This is a schematic diagram of the water circulation in the engine cooling system of the present invention.

[0027] Reference numerals: 1. Engine compartment; 2. Engine; 3. Engine intercooler; 4. Engine water radiator; 5. Expansion tank; 301. Radiator core assembly; 302. Radiator motor; 303. Radiator fan; 304. Air guide shroud; 305. Upper shock absorber; 306. Lower shock absorber; 401. Radiator core assembly; 402. Shock absorber; 403. Air guide shroud; 404. Radiator motor; 405. Radiator fan; 1a. Outlet pipe; 1b. Inlet pipe; 1c. Inlet pipe; 2a. Outlet pipe; 2b. Inlet pipe; 3a. Expansion pipe; 3b. Expansion pipe; 3c. Expansion pipe.

[0028] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] like Figure 1As shown, an engine cooling system includes a power compartment 1, an engine 2, an engine intercooler 3, an engine water radiator 4, and an expansion tank 5. The engine 2 is mounted on a base inside the power compartment 1. The engine intercooler 3 is mounted on a base at the inner end of the power compartment 1. The engine water radiator 4 is mounted on the upper crossbeam at the top of the power compartment 1, arranged vertically above the engine intercooler 3. The expansion tank 5 is mounted on the upper part of the engine water radiator 4. Both the engine intercooler 3 and the engine water radiator 4 adopt a suction cooling method.

[0033] like Figure 2 As shown, the engine water radiator 4 includes a heat dissipation core assembly 401, a shock absorber 402, an air guide shroud 403, a cooling motor 404, and a cooling fan 405. The air guide shroud 403 is welded to the heat dissipation core assembly 401. The cooling motor 404 and the cooling fan 405 are connected by a splined shaft and then mounted on the air guide shroud 403. The engine water radiator 4 is mounted on the top crossbeam of the engine compartment 1 via the shock absorber 402. A baffle is provided on the top of the engine compartment 1 to completely isolate the air guide shroud 403 from the interior of the engine compartment 1.

[0034] Further solution: The air guide shroud 403 of the engine water radiator 4 adopts an angled structure design with a wedge-shaped cross-section that is tilted upward. The angle between the center of the air duct of the air guide shroud 403 and the normal of the overall heat dissipation core 401 is greater than 20 degrees, so that the exhaust hot air is discharged upward, avoiding the backflow of hot air from the radiator and effectively reducing the temperature of the engine compartment.

[0035] A further solution: The engine water radiator 4 drives the cooling fan 405 to dissipate heat through the cooling motor 404, and the cooling function is achieved by dynamically adjusting the fan speed by changing the motor flow rate.

[0036] like Figure 3 As shown, the engine intercooler 3 includes a heat dissipation core assembly 301, a heat dissipation motor 302, a heat dissipation fan 303, an air guide shroud 304, an upper shock absorber 305, and a lower shock absorber 306. The air guide shroud 304 is welded to the heat dissipation core assembly 301. The heat dissipation motor 302 and the heat dissipation fan 303 are connected by a splined shaft and then mounted on the air guide shroud 304. The engine intercooler 3 is mounted on a base and a column inside the engine compartment 1 via two longitudinally arranged lower shock absorbers 306 and two laterally arranged shock absorbers 305, respectively.

[0037] A further embodiment: the heat dissipation core assembly 301 faces the outside of the power compartment 1, the heat dissipation fan 303 and the air guide shroud 304 face the engine 2 inside the power compartment 1, and the center of the air duct of the air guide shroud 304 is perpendicular to the surface of the heat dissipation core and parallel to the exhaust direction.

[0038] A further solution: The engine intercooler 3 uses a cooling motor 302 to drive a cooling fan 303 for heat dissipation, and the cooling function is achieved by dynamically adjusting the fan speed by changing the motor flow rate.

[0039] like Figure 4 As shown, after the engine 2, engine intercooler 3, engine radiator 4, and expansion tank 5 are installed on the engine compartment 1, the water pipes between the engine and the radiator are connected. The outlet pipe 1a of the engine radiator 4 is connected to the engine water pump suction port, and the inlet pipes 1b and 1c of the engine radiator 4 are connected to the outlet of the engine water-cooled thermostat. The outlet pipe 2a of the engine intercooler 3 is connected to the engine water pump suction port, and the inlet pipe 2b of the engine intercooler 3 is connected to the outlet of the engine intercooler thermostat. The expansion pipes 3a and 3b of the engine expansion tank 5 are connected to the inlet pipes 1c and 1b of the engine radiator 4, and the expansion pipe 3c of the engine expansion tank 5 is connected to the inlet pipe 2b of the engine intercooler 3.

[0040] After the cooling system is completed, during engine operation, the heat exchange between the engine water radiator 4 and the intercooler 3 is achieved by two independent hydraulic motors driving the cooling fan to draw in air. The air passes through the radiator, and the flow rate of the hydraulic motor is controlled to achieve stepless speed regulation of the motor, thereby realizing dynamic control of the engine cooling temperature.

[0041] In this embodiment, the existing cooling system, in which the engine water radiator and intercooler are placed in series in the engine compartment and share a single cooling fan, is changed to a new cooling system in which the water radiator and intercooler are arranged separately and cooled independently, and the high-temperature water radiator is moved to the outside of the engine compartment, which effectively improves the overall performance of the cooling system.

[0042] This invention also discloses an engine cooling method. The engine 2 is placed in the engine compartment 1, and the engine intercooler radiator 3 and the engine water radiator 4 are arranged in an upper and lower structure. The engine intercooler radiator 3, which is used for the low-temperature circulating water circuit, is placed inside the engine compartment 1. The center of the air duct of the air guide is perpendicular to the surface of the heat dissipation core and parallel to the exhaust direction. The engine water radiator 4, which is used for the high-temperature circulating water circuit, is placed outside the engine compartment 1. The air guide adopts an angled design, and the center of the air duct of the air guide has an upward tilt angle of more than 20° with the normal of the heat dissipation core, so that the exhaust hot air is discharged upward. The engine intercooler radiator 3 and the engine water radiator 4 are driven by a cooling motor to drive the cooling fan for independent cooling. The stepless speed regulation of the fan is achieved by adjusting the flow rate of the cooling motor, so as to achieve reasonable control of the engine system water temperature, intake air temperature and engine compartment temperature.

[0043] The present invention also discloses an engineering machine equipped with the above-mentioned engine cooling system.

[0044] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0045] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An engine heat dissipation system characterized by, include: Power compartment (1); The engine (2) is mounted on a base inside the power compartment (1); The engine intercooler radiator (3) is installed on the base at the inner end of the power compartment (1). The outlet pipe (2a) of the engine intercooler radiator (3) is connected to the water inlet of the engine water pump, and the inlet pipe (2b) is connected to the outlet of the engine intercooler thermostat. The engine water radiator (4) is installed on the top crossbeam of the power compartment (1) and is arranged vertically with the engine intercooler radiator (3). The outlet pipe (1a) of the engine water radiator (4) is connected to the water inlet of the engine water pump, and the inlet pipes (1b, 1c) are connected to the outlet of the engine water cooling thermostat. An expansion tank (5) is installed on the upper part of the engine water radiator (4). The first expansion water pipe (3a) and the second expansion water pipe (3b) of the engine expansion tank (5) are connected to the water inlet pipes (1c, 1b) of the engine water radiator (4). The third expansion water pipe (3c) of the engine expansion tank (5) is connected to the water inlet pipe (2b) of the engine intercooler radiator (3). The engine intercooler radiator (3) includes: Heat sink assembly (301); An air guide shroud (304) is attached to the heat dissipation core assembly (301); A cooling fan (303) is mounted on the air guide shroud (304); Upper shock absorber (305) and lower shock absorber (306), the engine intercooler radiator (3) is installed on the base and column inside the power compartment (1) respectively by the longitudinally arranged lower shock absorber (306) and the transversely arranged upper shock absorber (305); The engine water radiator (4) includes: Heat sink assembly (401); An air guide shroud (403) is attached to the heat dissipation core assembly (401); A cooling fan (405) is mounted on the air guide shroud (403); Shock absorber (402), the engine water radiator (4) is installed on the top crossbeam of the power compartment (1) through shock absorber (402), and the top of the power compartment (1) is provided with a baffle to completely isolate the air guide shroud (403) from the interior of the power compartment (1); The air guide shroud (403) adopts an inclined structure design with a wedge-shaped cross section that is inclined upward. The center of the air duct of the air guide shroud (403) has an upward inclination angle of more than 20° with the normal of the heat dissipation core assembly (401), so that the exhaust hot air is discharged upward and the heat dissipation core assembly (401) is prevented from flowing back into the heat dissipation core assembly. The engine intercooler radiator (3) also includes: The cooling motor (302) is connected to the cooling fan (303) via a splined shaft and mounted on the air guide shroud (304). The cooling function is achieved by dynamically adjusting the fan speed by changing the motor flow rate. The heat dissipation core assembly (301) faces the outside of the power compartment (1), and the heat dissipation fan (303) and the air guide shroud (304) face the engine (2) inside the power compartment (1). The center of the air duct of the air guide shroud (304) is perpendicular to the surface of the heat dissipation core and parallel to the exhaust direction. The engine water radiator (4) also includes: The cooling motor (404) is connected to the cooling fan (405) via a splined shaft and mounted on the air guide shroud (403). The cooling function is achieved by dynamically adjusting the fan speed by changing the motor flow rate.

2. The engine cooling system according to claim 1, characterized in that: The engine intercooler (3) and engine water radiator (4) both adopt the suction cooling method.

3. An engine cooling method based on the engine cooling system of claim 1 or 2, characterized in that: The engine (2) is placed in the power compartment (1), and the engine intercooler radiator (3) and the engine water radiator (4) are arranged in an upper and lower structure. The engine intercooler radiator (3) for low-temperature circulating water circuit is placed inside the power compartment (1), with the center of the air duct of the air guide perpendicular to the surface of the heat dissipation core and parallel to the exhaust direction; The engine water radiator (4) for high temperature circulating water circuit is placed outside the power compartment (1). The air guide shroud adopts an angled design. The center of the air guide shroud air duct and the normal of the heat dissipation core have an upward tilt angle of more than 20°, so that the hot air is discharged upward. The engine intercooler (3) and engine water radiator (4) use a cooling motor to drive the cooling fan for independent heat dissipation. By adjusting the flow rate of the cooling motor, the fan speed can be infinitely adjusted, so as to achieve reasonable control of the engine system water temperature, intake air temperature and engine compartment temperature.

4. An engineering machinery, characterized in that: The engine cooling system as described in claim 1 or 2 is installed.

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