Cooling system and vehicle

Abstract

The present invention relates to the field of vehicle technology, and in particular to a heat dissipation system and a vehicle. An electronic water pump is arranged between the heat exchanger group and the radiator. When the thermostat is closed, the engine water pump and the internal parts to be cooled of the engine form a small cycle to achieve cooling and lowering of the internal parts to be cooled of the engine, while the electronic water pump, the radiator and the heat exchanger group form a large cycle to achieve heat dissipation of other structures of the vehicle. In this way, the heat exchanger group for heat dissipation of other structures can maintain a lower water temperature under the premise of the engine independently circulating in a small cycle with a higher water temperature, so as to achieve a large temperature difference effect during braking and deceleration, extend the oil change cycle of the gearbox, retarder and wet brake hydraulic oil, and ensure that the system is not overheated. The setting of the electronic water pump enables the engine, gearbox and brake to reach their respective required operating temperatures.

Description

Technical Field

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

[0002] A mining dump truck is a type of ore transportation equipment used in mines. It has the characteristics of large load capacity and large power system load, and is an indispensable transportation equipment in mine development. In related technologies, the tonnage of mining trucks continues to increase, and the gearbox configuration requirements of mining dump truck cooling systems are increasing, and some mines also require wet brakes. This puts higher requirements on the cooling system capacity.

[0003] The ideal operating water temperature of existing diesel engines is 95℃-100℃. Too low water temperature will lead to poor fuel economy of the engine. The ideal water temperature of existing AT gearbox heat exchangers, wet bridge brake heat exchangers and hydraulic retarder heat exchangers is less than 70℃, and the hydraulic oil temperature alarm temperature generally does not exceed 120℃. If the water temperature is too high, on the one hand, the hydraulic oil is easy to deteriorate at high temperature, affecting the service life. On the other hand, during braking or slowing, the oil temperature of the wet brake or hydraulic retarder will rise rapidly. According to the heat exchange formula, the lower the coolant temperature, the better the heat dissipation effect. However, the existing cooling circuit for mining dump trucks keeps the water temperature of the engine and other heat exchangers consistent. In order to ensure the normal operation of the engine, the circuit water temperature is often high, which makes it impossible to ensure a large temperature difference during braking and slowing, resulting in frequent failures of gearbox high temperature alarm, hydraulic retarder high temperature alarm and wet brake high temperature alarm.

[0004] Therefore, a heat dissipation system is urgently needed to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a heat dissipation system and a vehicle, which can make the water temperature of an engine and other heat exchangers inconsistent and meet different water temperature requirements.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] On the one hand, a heat dissipation system is provided, comprising an engine water pump, an internal part to be cooled in the engine, a thermostat, a radiator and a heat exchanger group arranged in sequence, the thermostat having a medium inlet, a first medium outlet and a second medium outlet, the first medium outlet being fluidly connected to the inlet of the engine water pump, the second medium outlet being fluidly connected to the inlet of the radiator, the inlet of the internal part to be cooled in the engine being fluidly connected to the outlet of the engine water pump, and the outlet of the internal part to be cooled in the engine being fluidly connected to the inlet of the thermostat;

[0008] An electronic water pump is further provided between the heat exchanger group and the radiator, the inlet of the electronic water pump is fluidly connected to the outlet of the heat exchanger group, and the outlet of the electronic water pump is fluidly connected to the inlet of the radiator.

[0009] As a preferred technical solution of the above-mentioned heat dissipation system, a one-way valve is further provided between the electronic water pump and the radiator, and the one-way valve only allows the medium to flow from the electronic water pump to the radiator.

[0010] As a preferred technical solution of the above-mentioned heat dissipation system, a pipeline connecting the heat exchanger group and the electronic water pump is provided with a first temperature sensor.

[0011] As a preferred technical solution of the above-mentioned heat dissipation system, the heat exchanger group includes an axle heat exchanger and a transmission heat exchanger, the axle heat exchanger is used to dissipate heat for the axle, and the transmission heat exchanger is used to dissipate heat for the transmission.

[0012] As a preferred technical solution of the above-mentioned heat dissipation system, the axle heat exchanger includes a front axle heat exchanger and a mid-rear axle heat exchanger. The front axle heat exchanger is used for heat exchange for the front axle of the vehicle, and the mid-rear axle heat exchanger is used for heat exchange for the mid-rear axles of the vehicle.

[0013] As a preferred technical solution of the above-mentioned heat dissipation system, the axle is provided with a second temperature sensor for detecting the oil temperature.

[0014] As a preferred technical solution of the above-mentioned heat dissipation system, it also includes an expansion water tank, which is respectively connected to the internal parts to be cooled of the engine, the radiator and the engine water pump.

[0015] As a preferred technical solution of the above-mentioned heat dissipation system, a third temperature sensor is provided in the pipeline connecting the internal engine component to be cooled and the thermostat.

[0016] The utility model also provides a vehicle, comprising the heat dissipation system described in any one of the above solutions.

[0017] As a preferred technical solution of the above-mentioned vehicle, the vehicle is a mining dump truck.

[0018] The present invention has at least the following beneficial effects:

[0019] In the utility model, an electronic water pump is arranged between the heat exchanger group and the radiator. When the thermostat is closed, the engine water pump and the internal parts to be cooled of the engine form a small cycle to realize the cooling of the internal parts to be cooled of the engine, while the electronic water pump, radiator and heat exchanger group form a large cycle to realize the heat dissipation of other structures of the vehicle. In this way, the heat exchanger group for heat dissipation of other structures can maintain a lower water temperature under the premise of the engine independently circulating in a small cycle with a higher water temperature, so as to achieve a large temperature difference effect during the braking and deceleration process, extend the oil change cycle of the gearbox, retarder and wet brake hydraulic oil, and ensure that the system is not overheated. The setting of the electronic water pump enables the engine, gearbox and brake to reach their respective required operating temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 of the present invention. 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 the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0021] Figure 1 A block diagram of a heat dissipation system provided in an embodiment of the utility model.

[0022] In the figure:

[0023] 1. Engine water pump; 2. Engine internal parts to be cooled; 3. Thermostat; 4. Radiator; 5. Electronic water pump; 6. One-way valve; 7. First temperature sensor; 8. Axle heat exchanger; 81. Front axle heat exchanger; 82. Middle and rear axle heat exchanger; 9. Transmission heat exchanger; 10. Expansion tank; 11. Third temperature sensor; 12. Second temperature sensor; 100. Transmission; 200. Front axle; 300. Middle and rear axles. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0028] The utility model provides a heat dissipation system, which can meet the requirements of engines and other heat exchangers on water temperature.

[0029] like Figure 1 As shown, the heat dissipation system includes an engine water pump 1, an engine internal part to be cooled 2, a thermostat 3, a radiator 4 and a heat exchanger group which are arranged in sequence. The thermostat 3 has a medium inlet, a first medium outlet and a second medium outlet. The first medium outlet is connected to the inlet fluid of the engine water pump 1, the second medium outlet is connected to the inlet fluid of the radiator 4, the inlet of the engine internal part to be cooled 2 is connected to the outlet fluid of the engine water pump 1, and the outlet of the engine internal part to be cooled 2 is connected to the inlet fluid of the thermostat 3; an electronic water pump 5 is also arranged between the heat exchanger group and the radiator 4, the inlet of the electronic water pump 5 is connected to the outlet fluid of the heat exchanger group, and the outlet of the electronic water pump 5 is connected to the inlet fluid of the radiator 4.

[0030] In the utility model, an electronic water pump 5 is arranged between the heat exchanger group and the radiator 4. When the thermostat 3 is closed, the engine water pump 1 and the internal parts to be cooled 2 of the engine form a small cycle to realize the cooling of the internal parts to be cooled 2 of the engine, and the electronic water pump 5, the radiator 4 and the heat exchanger group form a large cycle to realize the heat dissipation of other structures of the vehicle. In this way, it can be ensured that the heat exchanger group for heat dissipation of other structures can maintain a lower temperature under the premise of the engine independently circulating in a small cycle with a higher water temperature, so as to achieve a large temperature difference effect during the braking and deceleration process, and extend the oil change cycle of the gearbox, retarder, and wet brake hydraulic oil, and ensure that the system is not overheated. The setting of the electronic water pump 5 enables the engine, gearbox, and brake to reach their respective required operating temperatures.

[0031] When the electronic water pump 5 is not working, the coolant in the thermostat 3 flows into the radiator 4, and the electronic water pump 5 is connected to the radiator 4, which will cause the coolant in the thermostat 3 to flow into the electronic water pump 5, resulting in poor heat dissipation effect of the radiator 4. For this reason, a one-way valve 6 is also arranged between the electronic water pump 5 and the radiator 4. The one-way valve 6 only allows the medium to flow from the electronic water pump 5 to the radiator 4, so that the coolant flowing out of the thermostat 3 directly enters the radiator 4. The setting of the one-way valve 6 can ensure that the coolant flow direction will not be wrong when the pump is turned off, thereby ensuring the heat dissipation effect.

[0032] Specifically, the heat exchanger group includes an axle heat exchanger 8 and a transmission heat exchanger 9. The axle heat exchanger 8 is used to dissipate heat for the axle, and takes away the heat of the wet brake hydraulic oil through cross convection of the coolant and the axle brake hydraulic oil. The transmission heat exchanger 9 is used to dissipate heat for the transmission 100, and takes away the heat of the transmission hydraulic oil through cross convection of the coolant and the transmission hydraulic oil. The setting of the heat exchanger group can cool down and dissipate heat for the transmission 100 and the axle, and avoid the transmission 100 and the axle from being blocked due to excessive temperatures. After passing through the radiator 4, the coolant can first enter the axle heat exchanger 8 and then flow into the transmission heat exchanger 9, or it can first enter the transmission heat exchanger 9 and then flow into the axle heat exchanger 8, and then flow back to the engine water pump 1 or the electronic water pump 5.

[0033] Furthermore, the axle heat exchanger 8 includes a front axle heat exchanger 81 and a middle and rear axle heat exchanger 82. The front axle heat exchanger 81 is used for heat exchange for the front axle 200 of the vehicle, and the middle and rear axle heat exchanger 82 is used for heat exchange for the middle and rear axles 300 of the vehicle. Since the vehicle includes the front axle 200 and the middle and rear axle 300, if a heat exchanger is provided to successively exchange heat for the front axle 200 and the middle and rear axle 300, the heat exchange effect of the first heat exchange will be poor due to the heat exchange effect of the axle that is heated later. Therefore, in this embodiment, it is defined that the axle heat exchanger 8 includes the front axle heat exchanger 81 and the middle and rear axle heat exchanger 82, so that the heat exchange task can be independently performed on different axles to ensure the heat exchange effect of each axle.

[0034] The heat dissipation system also includes an expansion water tank 10, which is connected to the internal parts to be cooled 2 of the engine, the radiator 4 and the engine water pump 1. The expansion water tank 10 is used to store and release superheated steam to keep the pressure of the cooling system stable and prevent the engine from overheating or damage due to excessive pressure. The expansion water tank 10 is installed in the engine compartment near the radiator 4 and is connected to the cooling system. When the coolant absorbs heat during the circulation process, steam will be generated, and the steam will be collected in the expansion water tank 10. As the steam increases, the pressure in the expansion water tank 10 will also rise. When the pressure reaches a certain level, the expansion water tank 10 will release part of the steam into the atmosphere through a valve, thereby reducing the pressure and maintaining the normal operation of the cooling system. In addition, the expansion water tank 10 can also adjust the total capacity of the system by adding or releasing coolant to the radiator 4, the engine water pump 1 and the internal parts to be cooled 2 of the engine to meet the needs of the engine under different working conditions. In addition, the expansion water tank 10 can also be used as an observation window to facilitate the inspection of the liquid level and quality of the coolant, and timely discover and solve problems.

[0035] In order to be able to change the temperature of the coolant after heat exchange, in some embodiments, the pipeline connecting the heat exchanger group and the electronic water pump 5 is provided with a first temperature sensor 7. The first temperature sensor 7 is used to monitor the coolant temperature T2 after the axle heat exchanger 8 and the transmission heat exchanger 9.

[0036] In order to obtain the temperature of the coolant after cooling the engine and determine the internal temperature of the engine, in some embodiments, the pipeline connecting the internal engine cooling part 2 and the thermostat 3 is provided with a third temperature sensor 11. The third temperature sensor 11 is used to monitor the coolant temperature T1 after the engine water outlet and before the thermostat 3.

[0037] In order to obtain the oil temperature of the axle, in some embodiments, the axle is provided with a second temperature sensor 12 for detecting the oil temperature. The front axle 200 and the middle and rear axle 300 are each provided with a second temperature sensor 12 .

[0038] The cooling system works as follows:

[0039] When the engine water temperature is lower than X1, the engine water pump 1 pumps coolant into the engine, and the coolant takes away the heat in the parts and oil inside the engine that need to be cooled, and is pumped into the engine again by the engine water pump 1 after the thermostat 3 judges the water temperature. When the engine water temperature is higher than X2, the engine water pump 1 pumps coolant into the engine, passing through the thermostat 3, radiator 4, front axle heat exchanger 81 and middle and rear axle heat exchanger 82, transmission heat exchanger 9, engine water pump 1 and engine in sequence. At this time, other heat dissipation circuits are connected in series to the engine cooling circuit. When the engine water temperature is between X1-X2, the large and small circulation chambers of the thermostat 3 are not closed, so the above cooling circulation circuits all exist.

[0040] The electronic water pump 5 can provide circulating water for the front axle heat exchanger 81, the middle and rear axle heat exchanger 82, and the transmission heat exchanger 9 separately. To ensure the stability of the overall cooling system, a one-way valve 6 is installed at the water outlet of the electronic water pump 5, and it can only be used before the engine thermostat 3 is fully opened. The output power of the electronic water pump 5 is adjusted according to the system temperatures T1, T2 and T3. When the engine thermostat 3 is closed, the coolant flows through the radiator 4, the front axle heat exchanger 81, the middle and rear axle heat exchanger 82, the transmission heat exchanger 9 and the electronic water pump 5 in sequence by the electronic water pump 5. At this time, the cooling circuits of other heat exchangers are in parallel with the engine cooling circuit. When the thermostat 3 is opened, the speed of the electronic water pump 5 decreases, and the electronic water pump 5 is completely closed when the thermostat 3 is fully opened. When the temperature in the engine decreases, the thermostat 3 begins to close, and the speed of the electronic water pump 5 increases again. The one-way valve 6 ensures that the direction of the water flow will not be wrong when the pump is closed. When the thermostat 3 is closed, the temperature in the cooling circuit can be reduced to the desired level by the electronic water pump 5, thereby reducing the "average temperature" in the gearbox 100 and the wet axle brakes.

[0041] It should be noted that the electronic water pump 5 can be controlled by PWM control, which can improve the reliability of the electronic water pump 5. The electronic water pump 5 is divided into 4 gears: 0, 25%, 75% and 100% speed.

[0042] When t1>T1, the gear position of electronic water pump 5 is 0; when t3>T3, the gear position of electronic water pump 5 is 100%; when t21≤T2≤t22, the gear position of electronic water pump 5 is 75%; when t22>75℃, the gear position of electronic water pump 5 is 100%; when t21<65℃, the gear position of electronic water pump 5 is 25%.

[0043] Among them, t1 preferably selects the middle temperature of thermostat 3; t3 preferably selects the ideal maximum working oil temperature of wet brake (generally 80°C), t21 preferably selects the ideal minimum working water temperature of wet brake and transmission heat exchanger 9 (generally 60°C), and t22 preferably selects the ideal maximum working water temperature of wet brake and transmission heat exchanger 9 (generally 70°C).

[0044] The embodiment of the present invention further provides a vehicle, comprising the heat dissipation system provided by the embodiment of the present invention. Exemplarily, the vehicle is a mining dump truck.

[0045] The vehicle also includes a control board, which is electrically connected to the electronic water pump 5, the engine water pump 1, the first temperature sensor 7, the second temperature sensor 11 and the third temperature sensor 12 respectively. The control board is used to receive the temperatures sent by the first temperature sensor 7, the second temperature sensor 11 and the third temperature sensor 12, and control the operation of the electronic water pump 5 and the engine water pump 1 according to the relevant temperatures.

[0046] In this embodiment, the control board can be a centralized or distributed controller. For example, the controller can be a single single-chip microcomputer or a distributed plurality of single-chip microcomputers. The single-chip microcomputer can run a control program to control each component to realize its function.

[0047] Since the above-mentioned heat dissipation system is included, the vehicle of the embodiment of the present invention has all the advantages and beneficial effects of the above-mentioned embodiments, which will not be described in detail here.

[0048] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A heat dissipation system, characterized in that: The invention comprises an engine water pump (1), an engine internal component to be cooled (2), a thermostat (3), a radiator (4) and a heat exchanger group which are arranged in sequence, wherein the thermostat (3) has a medium inlet, a first medium outlet and a second medium outlet, wherein the first medium outlet is connected to the inlet fluid of the engine water pump (1), the second medium outlet is connected to the inlet fluid of the radiator (4), the inlet of the engine internal component to be cooled (2) is connected to the outlet fluid of the engine water pump (1), and the outlet of the engine internal component to be cooled (2) is connected to the inlet fluid of the thermostat (3); An electronic water pump (5) is also provided between the heat exchanger group and the radiator (4); the inlet of the electronic water pump (5) is fluidically connected to the outlet of the heat exchanger group, and the outlet of the electronic water pump (5) is fluidically connected to the inlet of the radiator (4).

2. The heat dissipation system according to claim 1, characterized in that: A one-way valve (6) is also provided between the electronic water pump (5) and the radiator (4), and the one-way valve (6) only allows the medium to flow from the electronic water pump (5) to the radiator (4).

3. The heat dissipation system according to claim 1, characterized in that: The pipeline connecting the heat exchanger group and the electronic water pump (5) is provided with a first temperature sensor (7).

4. The heat dissipation system according to claim 1, characterized in that: The heat exchanger group comprises an axle heat exchanger (8) and a gearbox heat exchanger (9), wherein the axle heat exchanger (8) is used to dissipate heat for the axle, and the gearbox heat exchanger (9) is used to dissipate heat for the gearbox (100).

5. The heat dissipation system according to claim 4, characterized in that: The axle heat exchanger (8) comprises a front axle heat exchanger (81) and a mid-rear axle heat exchanger (82); the front axle heat exchanger (81) is used for heat exchange for a front axle (200) of a vehicle, and the mid-rear axle heat exchanger (82) is used for heat exchange for a mid-rear axle (300) of a vehicle.

6. The heat dissipation system according to claim 4, characterized in that: The axle is provided with a second temperature sensor (12) for detecting oil temperature.

7. The heat dissipation system according to claim 1, characterized in that: It also comprises an expansion water tank (10), wherein the expansion water tank (10) is respectively connected to the internal cooling part (2) of the engine, the radiator (4) and the engine water pump (1).

8. The heat dissipation system according to claim 1, characterized in that: The pipeline connecting the internal engine component to be cooled (2) and the thermostat (3) is provided with a third temperature sensor (11).

9. A vehicle, characterized in that Comprising a heat dissipation system as described in any one of claims 1-8.

10. The vehicle according to claim 9, characterized in that The vehicle is a mining dump truck.

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