Heat dissipation system and use method thereof

Abstract

The invention provides a heat dissipation system and method, the heat dissipation system comprises a hydraulic motor, a fan, a water radiator, a plunger pump and a controller, an engine is connected with the plunger pump and drives the plunger pump to rotate, the plunger pump is communicated with the hydraulic motor, and the fan and the water radiator are correspondingly arranged; when the temperature of the hydraulic oil is lower than 80 DEG C and the temperature of the anti-freezing solution is lower than 83 DEG C, the anti-freezing solution is circulated and cooled in the engine; when the temperature of the hydraulic oil is lower than 80 DEG C and the temperature of the anti-freezing solution is higher than 83 DEG C, the controller controls rotation of the hydraulic motor by controlling the displacement of the plunger pump, and the anti-freezing solution sequentially passes through the water radiator and an internal water path of the engine for cooling; and when the temperature of the hydraulic oil is higher than 80 DEG C, the controller controls the plunger pump to drive the hydraulic motor to drive the fan to rotate at the maximum displacement, and the anti-freezing solution sequentially passes through the water radiator and the engine for cooling. According to the cooling system, the rotating speed of the fan can be adjusted in real time according to the temperature of the anti-freezing solution and the hydraulic oil, and unnecessary rotation of the fan and energy waste are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle fan control, and in particular to a heat dissipation system and a use method thereof. Background Art

[0002] The cooling fan of a traditional engineering machinery engine is usually driven directly by the engine through a pulley. The speed of the cooling fan is proportional to the engine speed, that is, the higher the engine speed, the faster the fan speed. The fan speed cannot be adjusted according to actual needs, and the required heat dissipation effect cannot be achieved. Especially in extremely cold areas, if the fan speed is still positively correlated with the engine speed, the heat dissipation effect is better at a higher speed, which will cause the coolant temperature to be low and the engine cannot work in the best state. Extreme cold may also cause pipe icing, and high speed will cause energy consumption and waste. In addition, if the ambient temperature is high and the engine speed is low, it may cause poor heat dissipation, reduced engine power, and damage to parts. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a heat dissipation system, which can solve the problems existing in the prior art and can adjust the fan speed in real time according to the temperature of the antifreeze and hydraulic oil to prevent unnecessary rotation of the fan and waste of energy.

[0004] The present invention provides a heat dissipation system for dissipating heat for an engine and antifreeze of the engine. The heat dissipation system comprises a hydraulic motor, a fan, a water radiator, a plunger pump and a controller. The engine is connected to the plunger pump and drives the plunger pump to rotate. The plunger pump is communicated with the hydraulic motor. The hydraulic motor is connected to the fan and can drive the fan to rotate. The fan and the water radiator are arranged correspondingly. The water radiator is communicated with the internal water path of the engine. When the temperature of the hydraulic oil is less than 80°C and the antifreeze is less than 83°C, the antifreeze circulates in the engine and Cooling; when the hydraulic oil temperature is less than 80°C and the antifreeze is greater than 83°C, the controller controls the rotation speed of the hydraulic motor by controlling the displacement of the plunger pump, the hydraulic motor drives the fan to rotate, and the antifreeze passes through the water radiator and the internal water path of the engine in sequence for cooling; when the hydraulic oil temperature is greater than 80°C, the controller controls the plunger pump to work at the maximum displacement, the hydraulic motor drives the fan to rotate at the maximum displacement, and the antifreeze passes through the water radiator and the internal water path of the engine in sequence for cooling.

[0005] In one embodiment, the engine is provided with a first water inlet and a first water outlet, the water radiator is provided with a second water inlet and a second water outlet, the second water inlet is provided in the upper water chamber of the water radiator, the second water outlet is provided in the lower water chamber of the water radiator, the first water outlet is connected with the second water inlet, and the second water outlet is connected with the first water inlet, when the antifreeze liquid needs to be cooled through the water radiator, the antifreeze liquid passes through the first water outlet, the second water inlet, the heat dissipation core of the water radiator, the second water outlet and the first water inlet in sequence to enter the internal water channel of the engine.

[0006] In one embodiment, the heat dissipation system is provided with a thermostat and a temperature sensor, wherein the thermostat is provided at the first water outlet, and the thermostat is used to detect the temperature of the antifreeze of the engine; the temperature sensor is provided in the hydraulic oil tank, and the temperature sensor is used to detect the temperature of the hydraulic oil; the thermostat and the temperature sensor transmit the detected data to the controller.

[0007] In one embodiment, the water radiator also includes an expansion water tank, which is arranged above the upper water chamber and is connected to the upper water chamber. The expansion water tank is used to balance the pressure of the cooling system and remove bubbles from the antifreeze.

[0008] In one embodiment, the degassing port of the engine is connected to the expansion water tank via a degassing pipe, and a port of the degassing pipe is located above the antifreeze liquid level of the expansion water tank to remove bubbles of the antifreeze liquid in the expansion water tank.

[0009] In one embodiment, the water radiator is provided with a water supply pipe, one end of which is connected to the expansion water tank, and the other end of which is connected to the water outlet of the lower water chamber. Part of the antifreeze enters the internal water channel of the engine from the expansion water tank through the water supply pipe.

[0010] In one embodiment, the heat dissipation system includes a first oil inlet pipe, a second oil inlet pipe, a first oil return pipe and a second oil return pipe, the first oil inlet pipe is connected between the oil tank and the plunger pump, the second oil inlet pipe is connected between the plunger pump and the hydraulic motor, the oil inlet amount of the second oil inlet pipe is controlled by the plunger pump to control the rotation speed of the hydraulic motor, the first oil return pipe is connected between the plunger pump and the oil tank, and the second oil return pipe is connected between the hydraulic motor and the oil tank.

[0011] In one embodiment, the water radiator is provided with a partition, which is connected between the upper water chamber and the expansion water tank. The partition is provided with at least one through hole, which connects the upper water chamber and the expansion water tank. The antifreeze in the upper water chamber overflows into the expansion water tank through the through hole, or the antifreeze flows from the expansion water tank to the upper water chamber, so as to balance the pressure and remove bubbles.

[0012] The present invention also relates to a method for the above-mentioned heat dissipation system, the method comprising: when the engine is started, a current value of 550mA is given with a fan speed of 0; when the temperature of the hydraulic oil is less than 80°C and the antifreeze is less than 83°C, the antifreeze circulates and cools in the engine; when the temperature of the hydraulic oil is less than 80°C and the antifreeze is greater than 83°C, the controller controls the rotation speed of the hydraulic motor by controlling the displacement of the plunger pump, the hydraulic motor drives the fan to rotate, and the antifreeze passes through the water radiator and the internal water path of the engine in turn for cooling; when the temperature of the hydraulic oil is greater than 80°C, the controller controls the plunger pump to work at the maximum displacement, the hydraulic motor drives the fan to rotate at the maximum displacement, and the antifreeze passes through the water radiator and the internal water path of the engine in turn for cooling.

[0013] In one embodiment, when the temperature sensor detects that the temperature of the hydraulic oil is less than 80°C and the thermostat detects that the temperature of the antifreeze is greater than 83°C and less than 93°C, the current value input to the plunger pump is 170mA~320mA, so that the speed of the fan is linearly adjusted according to the antifreeze temperature table; when the temperature sensor detects that the temperature of the hydraulic oil is less than 80°C and the thermostat detects that the temperature of the antifreeze is greater than 93°C, the current value input to the plunger pump is 170mA, so that the speed of the fan reaches a maximum value of 1080rpm.

[0014] The heat dissipation system of the present invention is provided with a hydraulic motor, which is connected to a fan, and the engine is connected to a plunger pump. The plunger pump controls the rotation of the hydraulic motor by controlling the amount of hydraulic oil entering the hydraulic motor. Therefore, the controller controls the displacement of the plunger pump according to the temperature of the hydraulic oil and the antifreeze liquid to control the rotation speed of the hydraulic motor in real time, so that the heat dissipation system can adjust the speed of the fan in real time when the engine is overcooled or overheated, thereby achieving better heat dissipation effect and preventing unnecessary rotation of the fan and waste of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a front view structural schematic diagram of the heat dissipation system of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the fan and the engine of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the engine and the heat dissipation system of the present invention.

[0019] Figure 4 It is a structural schematic diagram of the heat dissipation system of the present invention from another perspective.

[0020] Figure 5 It is a schematic diagram of the piping structure of the hydraulic motor and the plunger pump of the present invention.

[0021] Figure 6 It is a control structure schematic diagram of the present invention.

[0022] Figure 7 It is a coordinate diagram of the change of the current value of the plunger pump of the present invention with the temperature of the antifreeze liquid.

[0023] Figure 8 It is a logic control diagram of the heat dissipation system of the present invention.

[0024] Explanation of the accompanying reference numerals: first water inlet 101; first water outlet 102; second water inlet 103; second water outlet 104; power take-off port 105; engine 11; hydraulic motor 12; plunger pump 13; water radiator 14; radiator body 141; expansion tank 142; upper water chamber 143; lower water chamber 144; degassing pipe 145; water supply pipe 146; motor bracket 147; water inlet pipe 148; water outlet pipe 149; fan 15; controller 16; thermostat 171; temperature sensor 172; oil tank 18; first oil inlet pipe 191; second oil inlet pipe 192; first oil return pipe 193; second oil return pipe 194; first hydraulic pipe 195.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] The directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0030] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0031] like Figures 1 to 8As shown, the cooling system is used to cool the engine 11 and the antifreeze in the engine 11. The cooling system includes a hydraulic motor 12, a fan 15, a water radiator 14, a plunger pump 13 and a controller 16. The engine 11 and the water radiator 14 are respectively installed on the subframe by bolts and nuts. The water radiator 14 is fixedly connected to a motor bracket 147. The hydraulic motor 12 is connected to the motor bracket 147 by bolts and nuts. The engine 11 is connected to the plunger pump 13 and drives the plunger pump 13 to rotate, that is, the power take-off port 105 of the engine 11 is connected to the plunger pump 13 by a spline, the plunger pump 13 is communicated with the hydraulic motor 12, the fan 15 is correspondingly arranged with the water radiator 14, the water radiator 14 is communicated with the internal water channel of the engine 11, and the fan 15 is connected to the hydraulic motor 13 through the spline sleeve on the fan 15. 12 is connected, and the fan 15 is axially fixed by bolts and gaskets; when the engine 11 is running, the antifreeze is in a high-temperature state. When the temperature of the hydraulic oil is less than 80°C and the antifreeze is less than 83°C, the antifreeze circulates and cools in the engine 11; when the temperature of the hydraulic oil is less than 80°C and the antifreeze is greater than 83°C, the controller 16 controls the rotation speed of the hydraulic motor 12 by controlling the displacement of the plunger pump 13, the hydraulic motor 12 drives the fan 15 to rotate, and the antifreeze passes through the water radiator 14 and the internal water path of the engine 11 in turn for cooling; when the temperature of the hydraulic oil is greater than 80°C, the controller 16 controls the plunger pump 13 to work at the maximum displacement, the hydraulic motor 12 drives the fan 15 to rotate at the maximum displacement, and the antifreeze passes through the water radiator 14 and the internal water path of the engine 11 in turn for cooling.

[0032] The heat dissipation system of the present invention is provided with a hydraulic motor 12, which connects the hydraulic motor 12 to a fan 15, and connects the engine 11 to a plunger pump 13. The plunger pump 13 controls the rotation of the hydraulic motor 12 by controlling the amount of hydraulic oil entering the hydraulic motor 12. Therefore, the controller 16 controls the displacement of the plunger pump 13 according to the temperature of the hydraulic oil and the antifreeze liquid to control the rotation speed of the hydraulic motor 12 in real time, so that the heat dissipation system can adjust the rotation speed of the fan 15 in real time when the engine 11 is overcooled or overheated, thereby achieving better heat dissipation effect and preventing the fan 15 from rotating unnecessary and wasting energy.

[0033] like Figure 5As shown, the heat dissipation system includes a first oil inlet pipe 191, a second oil inlet pipe 192, a first oil return pipe 193 and a second oil return pipe 194. The first oil inlet pipe 191 is connected between the oil tank 18 and the plunger pump 13, and the second oil inlet pipe 192 is connected between the plunger pump 13 and the hydraulic motor 12. The oil inlet amount of the second oil inlet pipe 192 is controlled by the plunger pump 13 to control the rotation speed of the hydraulic motor 12. A first hydraulic pipe 195 is connected between the plunger pump 13 and the hydraulic motor 12. The first hydraulic pipe 195 is used to return oil. , to balance the oil pressure, the first oil return pipe 193 is connected between the plunger pump 13 and the hydraulic motor 12, and the second oil return pipe 194 is connected between the hydraulic motor 12 and the oil tank 18 to prevent excessive hydraulic oil in the plunger pump 13 and the hydraulic motor 12. It can be understood that for ease of installation, one end of the first oil return pipe 193 can be connected with the plunger pump 13, and the other end of the first oil return pipe 193 can be connected with an end of the second oil return pipe 194 close to the hydraulic motor 12, so that the structural layout is reasonable, the space is compact, and the maintenance and repair of the fluid is convenient.

[0034] like Figure 3 and Figure 4 As shown, the engine 11 is provided with a first water inlet 101 and a first water outlet 102, the water radiator 14 is provided with a second water inlet 103 and a second water outlet 104, the second water inlet 103 is provided in the upper water chamber 143 of the water radiator 14, the second water outlet 104 is provided in the lower water chamber 144 of the water radiator 14, the first water outlet 102 is communicated with the second water inlet 103, and the second water outlet 104 is communicated with the first water inlet 101. When the antifreeze liquid needs to be cooled through the water radiator 14, the antifreeze liquid passes through the first water outlet 102, the second water inlet 103, the heat dissipation core of the water radiator, the second water outlet 104 and the first water inlet 101 in sequence to enter the internal water channel of the engine 11. In this embodiment, the water radiator 14 includes a water inlet pipe 148 and a water outlet pipe 149. The water inlet pipe 148 is connected between the first water outlet 102 of the engine 11 and the second water inlet 103 of the upper water chamber 143, and the water outlet pipe 149 is connected between the second water outlet 104 of the lower water chamber 144 and the first water inlet 101 of the water pump of the engine 11.

[0035] like Figure 4 As shown, the water radiator 14 is provided with a water supply pipe 146, one end of the water supply pipe 146 is connected to the expansion water tank 142, and the other end of the water supply pipe 146 is connected to the water outlet of the lower water chamber 144. Part of the antifreeze enters the internal water circuit of the engine 11 after passing through the water supply pipe 146 from the expansion water tank 142. It can be understood that part of the antifreeze in the water supply pipe 146 is mixed with the antifreeze at the first water inlet 101 of the engine 11 and then enters the internal water circuit of the engine 11; the water supply pipe 146 is used to balance the pressure of the pipeline of the water radiator 14.

[0036] like Figure 4 and Figure 6 As shown, the heat dissipation system is provided with a thermostat 171 and a temperature sensor 172. The thermostat 171 is provided at the first water outlet 102. The thermostat 171 is used to detect the temperature of the antifreeze of the engine 11. The temperature sensor 172 is provided in the hydraulic oil tank 18. The temperature sensor 172 is used to detect the temperature of the hydraulic oil. The thermostat 171 and the temperature sensor 172 are electrically connected to the controller 16 respectively. The thermostat 171 and the temperature sensor 172 transmit the detected data to the controller 16. The controller 16 analyzes and controls the displacement of the plunger pump 13 according to the data of the thermostat 171 and the temperature sensor 172. It can be understood that the data transmission of the thermostat 171 and the temperature sensor 172 is real-time transmission. The controller 16 sends a current signal according to the control logic to control the displacement of the plunger pump 13, so as to control the rotation speed of the hydraulic motor 12, thereby realizing real-time control of the rotation speed of the fan 15.

[0037] like Figure 4 As shown, the water radiator 14 also includes a radiator body 141 and an expansion water tank 142. The motor bracket 147 is connected to the radiator body 141 and is located in the middle position of the radiator body 141. The radiator body 141 is provided with a heat dissipation core. The antifreeze flows from the upper water chamber 143 through the heat dissipation core. The heat dissipation core fully cools the antifreeze and turns it into low-temperature antifreeze, and then flows to the lower water chamber 144. The expansion water tank 142 is arranged above the upper water chamber 143. The expansion water tank 142 is connected to the upper water chamber 143. The expansion water tank 142 is used to balance the pressure of the cooling system and remove bubbles in the antifreeze.

[0038] Preferably, when the hydraulic motor 12 drives the fan 15 to rotate, the fan 15 draws air clockwise, sucking cold air from the outside and passing through the heat dissipation core of the water radiator 14, and fully cooling the antifreeze in the heat dissipation core.

[0039] like Figure 3 and Figure 4 As shown, the degassing port of the engine 11 is connected to the expansion water tank 142 through a degassing pipe 145, and the port of the degassing pipe 145 is located above the antifreeze liquid level of the expansion water tank 142. The antifreeze of the engine 11 will produce bubbles during the cooling cycle, and the bubbles float on the antifreeze liquid level of the expansion water tank 142. Therefore, the degassing pipe 145 can remove the bubbles of the antifreeze in the expansion water tank 142 to prevent the bubbles from causing cavitation to the cylinder body of the engine 11. In this embodiment, five degassing pipes 145 are provided, and one end of the five degassing pipes 145 is respectively connected to the five degassing ports of the engine 11, and the other ends of the five degassing pipes 145 are respectively arranged along the length direction of the expansion water tank 142 and connected to the expansion water tank 142.

[0040] Preferably, the water radiator 14 is provided with a partition, which is connected between the upper water chamber 143 and the expansion water tank 142. The partition is provided with at least one through hole, which connects the upper water chamber 143 and the expansion water tank 142. The antifreeze in the upper water chamber 143 overflows to the expansion water tank 142 through the hole, and the antifreeze can also flow from the expansion water tank 142 to the upper water chamber 143 in the opposite direction, so as to balance the pressure and remove water bubbles. In this embodiment, a plurality of through holes are provided, and each through hole is arranged at intervals.

[0041] The present invention also relates to a method for the above-mentioned heat dissipation system, the method comprising:

[0042] When the engine 11 is started, the fan 15 is given a current value of 550mA with a speed of 0, and the fan 15 is in standby mode. In addition, when the engine 11 is stopped, the fan 15 is also given a current value of 550mA with a speed of 0, and the signal of the plunger pump 13 is cut off through the controller 16.

[0043] like Figure 8 As shown, the temperature sensor 172 detects the temperature of the hydraulic oil and transmits the detected data to the controller 16. When the temperature of the hydraulic oil is less than 80°C and the antifreeze is less than 83°C, the antifreeze performs a small cycle, that is, the antifreeze circulates and cools in the engine 11, and the antifreeze does not pass through the water radiator 14. The controller 16 gives the plunger pump 13 a corresponding current value of 320mA, changes the displacement of the plunger pump 13, and makes the fan 15 rotate at 36% of the rated speed of 1080rpm, so that the antifreeze can be quickly cooled to reach the optimal operating temperature of the engine 11;

[0044] The thermostat 171 is arranged at the first water outlet 102 of the engine 11, so the thermostat 171 can detect the temperature of the antifreeze liquid coming out of the engine 11. When the temperature of the hydraulic oil is less than 80°C and the antifreeze liquid is greater than 83°C, the thermostat 171 opens and measures the temperature of the antifreeze liquid, and the antifreeze liquid circulates widely. The controller 16 controls the rotation speed of the hydraulic motor 12 by controlling the displacement of the plunger pump 13. The hydraulic motor 12 drives the fan 15 to rotate. The antifreeze liquid passes through the water radiator 14 and the internal water path of the engine 11 in turn for cooling, so that the rotation speed of the fan 15 is linearly adjusted according to the antifreeze liquid temperature gauge. Specifically, when the temperature sensor When the temperature of the hydraulic oil detected by the thermostat 172 is less than 80°C and the temperature of the antifreeze liquid is greater than 83°C and less than 93°C, the current value input to the plunger pump 13 is 170mA to 320mA, and the current value 170mA corresponds to the maximum speed of the fan 15 of 1080rpm, and 320mA corresponds to 36% of the maximum speed of the fan 15 of 1080rpm, so that the speed of the fan 15 is linearly adjusted according to the temperature change table of the antifreeze liquid, that is, the higher the temperature of the antifreeze liquid, the faster the speed of the fan 15, so that the antifreeze liquid can dissipate heat better. For example, when the temperature of the antifreeze liquid is 84°C, the current value of the plunger pump 13 is given to be 300mA. For details, refer to Figure 7 ;

[0045] When the temperature sensor 172 detects that the temperature of the hydraulic oil is less than 80°C and the thermostat 171 detects that the temperature of the antifreeze is greater than 93°C, the thermostat 171 opens and the antifreeze circulates widely. At this time, the load of the engine 11 is large and better heat dissipation is required. The current value input to the plunger pump 13 is 170mA, so that the speed of the fan 15 reaches the maximum value of 1080rpm.

[0046] When the hydraulic oil temperature is greater than 80°C, the controller 16 controls the plunger pump 13 to operate at the maximum displacement, that is, a current value of 170mA is given to the plunger pump 13, and the hydraulic motor 12 drives the fan 15 to rotate at the maximum displacement. The speed of the fan 15 reaches 1080rpm, and the antifreeze passes through the water radiator 14 and the internal water circuit of the engine 11 in turn for cooling.

[0047] Therefore, the present invention has the following advantages:

[0048] (1) The heat dissipation system of the present invention has a protection signal when starting and stopping. That is, when the engine 11 is started and stopped, an electrical signal that the speed of the fan 15 is 0 is first input, and after stopping, the signal of the plunger pump 13 is cut off to prevent the fan 15 from generating unnecessary rotation and noise.

[0049] (2) The motor bracket 147 of the heat dissipation system of the present invention is installed on the radiator body 141 of the water radiator 14, the hydraulic motor 12 is installed on the motor bracket 147 and connected to the fan 15 through a spline sleeve, and the water radiator 14 and the engine 11 are respectively installed on the subframe. The overall structure is reasonably arranged and compact, and the maintenance space is taken into consideration, making maintenance more convenient.

[0050] (3) The heat dissipation system of the present invention can adjust the speed of the fan (15) in real time according to the temperature of the antifreeze liquid and the hydraulic oil, so as to achieve real-time adjustment of the speed of the fan 15 when the engine 11 is overcooled or overheated, thereby achieving the desired heat dissipation effect.

[0051] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A heat dissipation system for dissipating heat from an engine (11) and antifreeze fluid in the engine (11), characterized in that: The heat dissipation system comprises a hydraulic motor (12), a fan (15), a water radiator (14), a plunger pump (13) and a controller (16); the engine (11) is connected to the plunger pump (13) and drives the plunger pump (13) to rotate; the plunger pump (13) is communicated with the hydraulic motor (12); the hydraulic motor (12) is connected to the fan (15) and can drive the fan (15) to rotate; the fan (15) and the water radiator (14) are arranged correspondingly; and the water radiator (14) is communicated with an internal water path of the engine (11); When the temperature of the hydraulic oil is less than 80° C. and the temperature of the antifreeze liquid is less than 83° C., the antifreeze liquid circulates and cools in the engine (11); When the temperature of the hydraulic oil is less than 80° C. and the temperature of the antifreeze liquid is greater than 83° C., the controller (16) controls the displacement of the plunger pump (13) to control the rotation speed of the hydraulic motor (12), the hydraulic motor (12) drives the fan (15) to rotate, and the antifreeze liquid sequentially passes through the water radiator (14) and the internal water path of the engine (11) for cooling; When the temperature of the hydraulic oil is greater than 80° C., the controller (16) controls the plunger pump (13) to operate at a maximum displacement, the hydraulic motor (12) drives the fan (15) to rotate at a maximum displacement, and the antifreeze liquid passes through the water radiator (14) and the internal water circuit of the engine (11) in sequence for cooling.

2. The heat dissipation system according to claim 1, characterized in that: The engine (11) is provided with a first water inlet (101) and a first water outlet (102); the water radiator (14) is provided with a second water inlet (103) and a second water outlet (104); the second water inlet (103) is provided in an upper water chamber (143) of the water radiator (14); the second water outlet (104) is provided in a lower water chamber (144) of the water radiator (14); the first water outlet (102) is communicated with the second water inlet (103); the second water outlet (104) is communicated with the first water inlet (101); when the antifreeze liquid needs to pass through the water radiator (14) for cooling, the antifreeze liquid passes through the first water outlet (102), the second water inlet (103), the heat dissipation core of the water radiator, the second water outlet (104) and the first water inlet (101) in sequence to enter the internal water channel of the engine (11).

3. The heat dissipation system according to claim 2, characterized in that: The heat dissipation system is provided with a thermostat (171) and a temperature sensor (172); the thermostat (171) is arranged at the first water outlet (102); the thermostat (171) is used to detect the temperature of the antifreeze liquid of the engine (11); the temperature sensor (172) is arranged in the hydraulic oil tank (18); the temperature sensor (172) is used to detect the temperature of the hydraulic oil; the thermostat (171) and the temperature sensor (172) transmit the detected data to the controller (16).

4. The heat dissipation system according to claim 3, characterized in that: The water radiator (14) further comprises an expansion water tank (142), wherein the expansion water tank (142) is arranged above the upper water chamber (143), the expansion water tank (142) is communicated with the upper water chamber (143), and the expansion water tank (142) is used to balance the pressure of the heat dissipation system and remove bubbles of the antifreeze liquid.

5. The heat dissipation system according to claim 4, characterized in that: The degassing port of the engine (11) is connected to the expansion water tank (142) via a degassing pipe (145), and a port of the degassing pipe (145) is located above the antifreeze liquid level of the expansion water tank (142) to remove bubbles of the antifreeze liquid in the expansion water tank (142).

6. The heat dissipation system according to claim 4, characterized in that: The water radiator (14) is provided with a water supply pipe (146), one end of which is connected to the expansion water tank (142), and the other end of which is connected to the water outlet of the lower water chamber (144). Part of the antifreeze flows from the expansion water tank (142) through the water supply pipe (146) and enters the internal water channel of the engine (11).

7. The heat dissipation system according to claim 4, characterized in that: The heat dissipation system comprises a first oil inlet pipe (191), a second oil inlet pipe (192), a first oil return pipe (193) and a second oil return pipe (194); the first oil inlet pipe (191) is connected between the oil tank (18) and the plunger pump (13); the second oil inlet pipe (192) is connected between the plunger pump (13) and the hydraulic motor (12); the oil inlet amount of the second oil inlet pipe (192) is controlled by the plunger pump (13) to control the rotation speed of the hydraulic motor (12); the first oil return pipe (193) is connected between the plunger pump (13) and the oil tank (18); and the second oil return pipe (194) is connected between the hydraulic motor (12) and the oil tank (18).

8. The heat dissipation system according to claim 4, characterized in that: The water radiator (14) is provided with a partition, and the partition is connected between the upper water chamber (143) and the expansion water tank (142). The partition is provided with at least one through hole, and the through hole connects the upper water chamber (143) and the expansion water tank (142). The antifreeze liquid in the upper water chamber (143) overflows into the expansion water tank (142) through the through hole, or the antifreeze liquid flows from the expansion water tank (142) to the upper water chamber (143), so as to balance the pressure and remove water bubbles.

9. A method for using the heat dissipation system according to any one of claims 1 to 8, characterized in that: The method comprises: When the engine (11) is started, the current value of 550mA is set at zero speed of the fan (15); When the temperature of the hydraulic oil is less than 80° C. and the temperature of the antifreeze liquid is less than 83° C., the antifreeze liquid circulates and cools in the engine (11); When the temperature of the hydraulic oil is less than 80° C. and the temperature of the antifreeze liquid is greater than 83° C., the controller (16) controls the displacement of the plunger pump (13) to control the rotation speed of the hydraulic motor (12), the hydraulic motor (12) drives the fan (15) to rotate, and the antifreeze liquid sequentially passes through the water radiator (14) and the internal water path of the engine (11) for cooling; When the temperature of the hydraulic oil is greater than 80° C., the controller (16) controls the plunger pump (13) to operate at a maximum displacement, the hydraulic motor (12) drives the fan (15) to rotate at a maximum displacement, and the antifreeze liquid passes through the water radiator (14) and the internal water circuit of the engine (11) in sequence for cooling.

10. The method for using a heat dissipation system according to claim 9, characterized in that: When the temperature sensor (172) detects that the temperature of the hydraulic oil is less than 80°C and the thermostat (171) detects that the temperature of the antifreeze liquid is greater than 83°C and less than 93°C, a current value of 170mA to 320mA is input to the plunger pump (13), so that the rotation speed of the fan (15) is linearly adjusted according to the antifreeze liquid temperature table; When the temperature sensor (172) detects that the temperature of the hydraulic oil is less than 80°C and the thermostat (171) detects that the temperature of the antifreeze liquid is greater than 93°C, the current value input to the plunger pump (13) is 170mA, so that the rotation speed of the fan (15) reaches a maximum value of 1080rpm.

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