Heat dissipation system and electric forklift

Abstract

The embodiment of the utility model discloses a heat dissipation system and an electric forklift. The heat dissipation system is applied to the electric forklift, the electric forklift comprises a first kind of heating devices and a second kind of heating devices which have different heating values in the working process, and the heat dissipation system comprises a radiator and at least two cooling pipes arranged in parallel; the heat radiator comprises at least two heat radiation flow channels which are arranged in parallel; the heat dissipation flow channels and the cooling pipes are arranged in a one-to-one correspondence mode and communicate with each other to form a circulation loop. And the first type of heating devices and the second type of heating devices are respectively arranged in different cooling pipes. The heat dissipation system provided by the embodiment of the utility model can meet different heat dissipation requirements of heating devices with two or more temperature gradients.

Description

Technical Field

[0001] The present application belongs to the technical field of heat dissipation equipment for forklifts, and specifically, the present application relates to a heat dissipation system and an electric forklift. Background Art

[0002] In the electric forklift industry, due to the limitations of the electric forklift's own structure, performance and system cost, the electric forklift usually adopts a heat dissipation solution of connecting all the heating components in series one by one and then cooling them with a single water channel. However, due to the different heat generation of different heating components, the current solution of connecting all the heating components in series for heat dissipation has poor heat dissipation effect, low heat dissipation efficiency and occupies a large space. Utility Model Content

[0003] The purpose of this application is to provide a new technical solution for a heat dissipation system and an electric forklift.

[0004] According to one aspect of the present application, a heat dissipation system is provided, which is applied to an electric forklift, wherein the electric forklift includes a first type of heating device and a second type of heating device with different heat outputs during operation, and is characterized in that:

[0005] The heat dissipation system comprises a radiator and at least two cooling pipes arranged in parallel;

[0006] The radiator comprises at least two heat dissipation channels arranged in parallel;

[0007] The heat dissipation channel and the cooling pipe are arranged in a one-to-one correspondence and are connected to form a circulation loop;

[0008] The first type of heating device and the second type of heating device are arranged in different cooling tubes.

[0009] Optionally, the radiator further includes an air cooling component, and the air cooling component is located outside the at least two heat dissipation channels.

[0010] Optionally, among the at least two heat dissipation channels, the heat dissipation channel with the smallest heat dissipation requirement is located on a side away from the air cooling component.

[0011] Optionally, the air cooling assembly includes a plurality of fans arranged at intervals along the length direction of the heat dissipation channel.

[0012] Optionally, the heat dissipation channel includes a liquid inlet and a liquid outlet;

[0013] The cooling pipe comprises an inlet and an outlet, and the cooling pipe is filled with a coolant;

[0014] The liquid outlet of the heat dissipation channel is connected to the inlet of the cooling pipe, and the liquid inlet of the heat dissipation channel is connected to the outlet of the cooling pipe to form the circulation loop.

[0015] Optionally, a circulation pump is provided at the inlet of the cooling pipe.

[0016] Optionally, a temperature sensor is provided at the liquid outlet of the heat dissipation channel or the inlet of the cooling pipe.

[0017] Optionally, the first type of heating device and / or the second type of heating device is electrically connected to a temperature sensor.

[0018] Optionally, the heat dissipation system further includes a secondary water tank, and a converging check valve and a diverting check valve;

[0019] The auxiliary water tank includes a first port and a second port;

[0020] Wherein, the first port is connected to the inlet of any cooling pipe through the diversion one-way valve, and the second port is connected to the outlet of any cooling pipe through the confluence one-way valve.

[0021] Optionally, in the height direction, the auxiliary water tank is located above the radiator, and the auxiliary water tank is filled with coolant.

[0022] Optionally, a liquid level monitoring sensor is provided in the auxiliary water tank, and the liquid level monitoring sensor is electrically connected to the control device of the electric forklift.

[0023] Optionally, the at least two heat dissipation channels include a first heat dissipation channel and a second heat dissipation channel arranged in parallel;

[0024] The at least two cooling pipes include a first cooling pipe and a second cooling pipe arranged in parallel;

[0025] The first heat dissipation channel includes a first liquid inlet and a first liquid outlet;

[0026] The second heat dissipation channel includes a second liquid inlet and a second liquid outlet.

[0027] The inlet of the first cooling pipe is communicated with the first liquid outlet, and the outlet of the first cooling pipe is communicated with the first liquid inlet;

[0028] The inlet of the second cooling pipe is communicated with the second liquid outlet, and the outlet of the second cooling pipe is communicated with the second liquid inlet.

[0029] Optionally, the first type of heating device is provided in plurality and is arranged in series on the first cooling tube;

[0030] and / or,

[0031] The second type of heating device is provided in plurality and is arranged in series on the second cooling tube.

[0032] Optionally, the diverter one-way valve comprises a first liquid replenishment port, a first one-way liquid inlet port and a second one-way liquid inlet port, and the first liquid replenishment port is connected to the first one-way liquid inlet port and the second one-way liquid inlet port respectively;

[0033] The first liquid replenishing port is connected to the first port of the auxiliary water tank through a first pipe, the first one-way liquid inlet is connected to the inlet of the first cooling pipe, and the second one-way liquid inlet is connected to the inlet of the second cooling pipe.

[0034] Optionally, the converging one-way valve comprises a second liquid replenishing port, a third one-way liquid inlet and a fourth one-way liquid inlet, and the second liquid replenishing port is communicated with the third one-way liquid inlet and the fourth one-way liquid inlet respectively;

[0035] The second liquid replenishing port is connected to the second port of the auxiliary water tank through a second pipe, the third one-way liquid inlet is connected to the outlet of the first cooling pipe, and the fourth one-way liquid inlet is connected to the outlet of the second cooling pipe.

[0036] Optionally, the first liquid inlet is connected to the first one-way liquid inlet and the second one-way liquid inlet respectively through a first shunt pipe;

[0037] The second liquid inlet is connected to the third one-way liquid inlet and the fourth one-way liquid inlet through a second shunt pipe respectively;

[0038] One-way valves are respectively arranged on the first shunt pipe and the second shunt pipe, and the one-way valve on the first shunt pipe is in opposite directions to the one-way valve on the second shunt pipe.

[0039] Optionally, the first type of heating device and the second type of heating device are electrically connected to a temperature sensor respectively.

[0040] Optionally, a first circulation pump is provided at the inlet of the first cooling pipe;

[0041] and / or,

[0042] A second circulation pump is provided at the inlet of the second cooling pipe.

[0043] Optionally, a first temperature sensor is disposed at the position of the first liquid outlet of the first heat dissipation channel;

[0044] and / or,

[0045] A second temperature sensor is disposed at the position of the second liquid outlet of the second heat dissipation channel.

[0046] According to another aspect of the present application, an electric forklift is provided, and the electric forklift includes the heat dissipation system as described in the first aspect.

[0047] One beneficial effect of the embodiments of the present application is:

[0048] The heat dissipation system proposed in the embodiment of the present application is used to classify the heat dissipation of the heating components in the electric forklift. By setting at least two parallel circulation loops, independent heat dissipation can be performed for heating components with different heat amounts, thereby meeting the heat dissipation requirements of heating components with two or more temperature gradients, improving the heat dissipation effect and efficiency, and being able to easily expand more circulation loops.

[0049] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0051] Figure 1 A schematic diagram of a heat dissipation system provided in an embodiment of the present application;

[0052] Figure 2 One of the structural schematic diagrams of the radiator of the heat dissipation system provided in the embodiment of the present application;

[0053] Figure 3 A second structural schematic diagram of a radiator of a heat dissipation system provided in an embodiment of the present application;

[0054] Figure 4 A schematic diagram of the structure of a flow diversion one-way valve of a heat dissipation system provided in an embodiment of the present application;

[0055] Figure 5 A schematic diagram of the structure of a converging one-way valve of a heat dissipation system provided in an embodiment of the present application.

[0056] Description of reference numerals:

[0057] 1. First cooling pipe; 2. Second cooling pipe; 3. First pipeline; 4. Second pipeline; 5. One-way valve; 6. Converging one-way valve; 7. Radiator; 8. Auxiliary water tank; 9. Diverting one-way valve; 10. First temperature sensor; 11. Second temperature sensor; 12. First circulation pump; 13. Second circulation pump; 14. First liquid inlet; 15. Second liquid inlet; 16. First heat dissipation channel; 17. Second heat dissipation channel; 18. Air cooling component; 19. First liquid outlet; 20. Second liquid outlet; 21. First one-way liquid inlet; 22. Second one-way liquid inlet; 23. First liquid replenishment port; 24. Third one-way liquid inlet; 25. Fourth one-way liquid inlet; 26. Second liquid replenishment port; 01. First type of heating device; 02. Second type of heating device. DETAILED DESCRIPTION

[0058] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0059] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0060] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0061] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0062] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0063] The heat dissipation system and the electric forklift provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0064] According to one aspect of the present application, a heat dissipation system is provided, the heat dissipation system being applied to an electric forklift, the electric forklift comprising a first type of heat generating device and a second type of heat generating device having different heat outputs during operation. Figure 1 The heat dissipation system includes a radiator 7 and at least two cooling pipes arranged in parallel. The radiator 7 includes at least two heat dissipation channels arranged in parallel. Figure 2 and Figure 3The heat dissipation channels and the cooling tubes are arranged in a one-to-one correspondence and are connected to form a circulation loop. The first type of heating device 01 and the second type of heating device 02 are arranged in different cooling tubes.

[0065] According to the heat dissipation system provided in the embodiment of the present application, see Figures 1 to 3 , the main heating components in the electric forklift are divided into the first type of heating components 01 and the second type of heating components 02 according to the different heat output. This is in consideration of the different heat output requirements for heat dissipation of heating components. For example, the heat output required for a heating component with a large heat output is often much larger than that required for a heating component with a small heat output. In view of this, the embodiment of the present application provides a heat dissipation system that is scalable and can meet the heat dissipation requirements of heating components with two or more temperature gradients. In other words, by dissipating heat in different categories for heating components with different heat output in the electric forklift, the heat dissipation effect and efficiency can be improved.

[0066] The first type of heating device 01 may be, for example, a battery pack or an on-board charger (OBC) or other heating device with a relatively large heat generation. Figure 1 The two first-class heating components 01 are, in order, the battery pack and the on-board charger (OBC)

[0067] The second type of heating device 02 is, for example, a lifting controller of an electric forklift or a two-in-one driving motor. The heat generated by the second type of heating device 02 is much lower than the heat generated by the first type of heating device 01. Figure 1 The two second-type heating devices 02 are, in order, a boost controller and a two-in-one drive motor.

[0068] The heat dissipation system provided in the embodiment of the present application is designed to connect multiple heating devices (first type of heating device 01, such as battery packs and on-board chargers) with the same or similar calorific value in series on a circulation loop for heat dissipation, and at least one heating device with a large difference in calorific value (second type of heating device 02, such as a lifting controller or a driving two-in-one motor) is connected in parallel on another circulation loop. In this way, the different heat dissipation requirements of heating devices with multiple temperature gradients can be met. That is, the heat dissipation solution provided in the embodiment of the present application can be applied to heating elements with multiple temperature gradients.

[0069] It should be noted that the embodiments of the present application can implement two or more multi-circuit circuit solutions, and can provide good heat dissipation and cooling functions for heating devices with more temperature gradients.

[0070] In the heat dissipation system provided in the embodiment of the present application, the cooling tube is filled with a coolant, and the coolant can continuously circulate in the circulation loop formed by the cooling tube and the heat dissipation channel, thereby achieving heat dissipation of the first type of heating device 01 and / or the second type of heating device 02 by water cooling.

[0071] Specifically, according to the heat dissipation system provided in the embodiment of the present application, see Figure 1 , at least two cooling tubes may include Figure 1 The first cooling tube 1 and the second cooling tube 2 shown in FIG. Figure 2 and Figure 3 The at least two heat dissipation channels may include a first heat dissipation channel 16 and a second heat dissipation channel 17. The first cooling tube 1 is connected to the first heat dissipation channel 16 to form a circulation loop, and the second cooling tube 2 is connected to the second heat dissipation channel 17 to form another circulation loop.

[0072] In some examples of this application, see Figure 2 and Figure 3 The radiator 7 further includes an air cooling component 18, and the air cooling component 18 is located outside the at least two heat dissipation channels.

[0073] See also Figures 1 to 3 The radiator 7 may include a first heat dissipation channel 16 and a second heat dissipation channel 17 stacked up and down, and an air cooling component 18 may be provided on the outside of all the heat dissipation channels, so that air cooling can be used to accelerate the heat dissipation of the coolant in the heat dissipation channels.

[0074] That is to say, the radiator provided in the embodiment of the present application includes two parts, one part is the heat dissipation channel, and the other part is the air cooling component 18. The air cooling component 18 can accelerate the cooling rate of the coolant in the heat dissipation channel through air cooling.

[0075] In some examples of the present application, among the at least two heat dissipation channels, the heat dissipation channel with the smallest heat dissipation requirement is located on a side away from the air cooling component 18 .

[0076] The heat sink 7 may include at least two heat dissipation channels arranged in parallel, so that heat dissipation can be performed according to the heat generating devices with different heat output.

[0077] For a heating device with a large heat output, such as the first type of heating device 01, it has a large demand for heat dissipation. The heat dissipation channel connected to the cooling pipe of the first type of heating device 01 can be set close to the air cooling component 18, so that the coolant in the heat dissipation channel can be quickly cooled by air cooling. In view of this, the heat dissipation channel with a small heat dissipation demand is located on the side away from the air cooling component 18. Through reasonable layout, the heat dissipation effect can be better improved.

[0078] In some examples of this application, see Figure 2 The air cooling assembly 18 includes a plurality of fans spaced apart along the length direction of the heat dissipation channel.

[0079] By sequentially arranging a plurality of fans along the length direction of the heat dissipation channel, multiple locations of the heat dissipation channel can be effectively cooled by air, thereby quickly cooling the internal coolant.

[0080] In some examples of this application, see Figure 2 The heat dissipation channel includes a liquid inlet and a liquid outlet. The cooling pipe includes an inlet and an outlet, and the cooling pipe is filled with coolant. The liquid outlet of the heat dissipation channel is connected to the inlet of the cooling pipe, and the liquid inlet of the heat dissipation channel is connected to the outlet of the cooling pipe to form the circulation loop.

[0081] Specifically, see Figure 2 The first cooling tube 1 and the second cooling tube 2 may form an inlet and an outlet at both ends, respectively. The first heat dissipation channel 16 may form a first liquid inlet 14 and a first liquid outlet 19 at both ends, and the second heat dissipation channel 17 may form a second liquid inlet 15 and a second liquid outlet 20 at both ends.

[0082] In one example, see Figures 1 to 3 The inlet of the first cooling tube 1 is connected to the first liquid outlet 19 of the first heat dissipation channel 16, and the outlet of the first cooling tube 1 is connected to the first liquid inlet 14 of the first heat dissipation channel 16. In this way, the coolant can circulate in the circulation loop formed by the first cooling tube 1 and the first heat dissipation channel 16.

[0083] In some examples of the present application, a circulation pump is provided at the inlet of the cooling pipe.

[0084] The circulation pump can drive and accelerate the flow of the coolant in the cooling pipe so that it can pass through the first type of heating device 01 or the second type of heating device 02, thereby achieving water cooling.

[0085] See also Figure 1 A first circulating pump 12 is arranged at the inlet of the first cooling pipe 1, and a second circulating pump 13 is arranged at the inlet of the second cooling pipe 2. Specifically, when the electric forklift is started, the first circulating pump 12 and the second circulating pump 13 start to drive the coolant in their respective circulation loops to flow, one path of the coolant can pass through the first type of heating device 01 (such as the battery pack and the on-board charger OBC), and the other path of the coolant passes through the second type of heating device 02 (such as the lifting controller and the driving two-in-one motor), and the temperature of these heating components is reduced by heat conduction.

[0086] In some examples of the present application, a temperature sensor is provided at the liquid outlet of the heat dissipation channel or the inlet of the cooling pipe.

[0087] By setting a temperature sensor at the outlet of the heat dissipation channel, such as Figure 1 The first temperature sensor 10 and the second temperature sensor 11 shown in the figure can monitor the coolant temperature at the outlet of the heat dissipation channel.

[0088] In one example, when the coolant temperature of the first liquid outlet 19 of the first heat dissipation channel 16 monitored by the first temperature sensor 10 is ≥ the rated temperature T1 of the first type of heat-generating device 01, such as the battery pack and the on-board charger OBC, it indicates that the heat dissipation efficiency of the entire heat dissipation system is insufficient. At this time, the flow rates of the air cooling component 18 and the first circulation pump 12 are adjusted to the maximum value at the same time.

[0089] In some examples of the present application, the first type of heating device 01 and / or the second type of heating device 02 are electrically connected to a temperature sensor (not shown in the figure).

[0090] The heat dissipation solution provided in the embodiment of the present application is designed so that the first type of heating device 01 and the second type of heating device 02 can both be equipped with temperature sensors. Of course, it is also possible to add temperature sensors to the water outlets of the first type of heating device 01 and the second type of heating device 02. Both methods can detect the temperature of the first type of heating device 01 and the second type of heating device 02 in real time.

[0091] See also Figure 1 For example, there are two first-type heating devices 01, namely a battery pack and an on-board charger OBC, and the rated temperatures of both are T1. When the actual temperature of the first-type heating device 01 (the temperature obtained by the temperature sensor) is ≥ T1, the air cooling component 18 can be started and adjusted to the rated speed to accelerate the cooling rate of the coolant in the first heat dissipation channel 16.

[0092] The maximum operating temperature of the battery pack is set to T2 and the maximum operating temperature of the on-board charger OBC is set to T3. When the temperature sensor detects that the real-time temperature of the battery pack is ≥ T2 or the real-time temperature of the on-board charger OBC is ≥ T3, the wind speed of the air cooling component 18 and the flow rate of the first circulation pump 12 are adjusted to the maximum value at the same time. A series of temperature values ​​are set between T1 and T2, T1 and T3. When it is detected that the real-time temperature of the battery pack or the on-board charger OBC exceeds T1 and reaches one of the values, the speed of the air cooling component 18 is increased to the first target value and the flow rate of the first circulation pump 12 is increased to the second target value, the circulation speed of the coolant is increased, and the heat exchange rate in the circulation loop is improved.

[0093] It should be noted that the circulation loop where the second circulation pump 13 is located has the same principle as the circulation loop discussed in this paragraph, which will not be repeated here.

[0094] In some examples of this application, see Figure 1 The cooling system also includes an auxiliary water tank 8, a merging one-way valve 6 and a diverter one-way valve 9; the auxiliary water tank 8 includes a first port and a second port; wherein the first port is connected to the inlet of any cooling pipe through the diverter one-way valve 9, and the second port is connected to the outlet of any cooling pipe through the merging one-way valve 6.

[0095] See also Figure 1 The auxiliary water tank 8 can replenish coolant for the circulation loop composed of the cooling pipe and the heat dissipation channel. At the same time, when the circulation loop contains gas, the gas can escape to the auxiliary water tank 8 through the pipe connected to the auxiliary water tank 8.

[0096] In some examples of this application, see Figure 1 In the height direction, the auxiliary water tank 8 is located above the radiator, and the auxiliary water tank 8 is filled with coolant.

[0097] When the coolant in any circulation loop is insufficient to fill the entire circulation loop due to evaporation, vaporization, etc., the coolant in the auxiliary water tank 8 installed at the highest position in the entire cooling system can enter the diversion check valve 9 through the first pipe 3 by gravity and fill the circulation loop on the side where the coolant is missing. When there is gas in the circulation loop, the gas can escape to the auxiliary water tank 8 through the converging check valve 6 and then through the second pipe 4 connected to the auxiliary water tank 8.

[0098] In some examples of the present application, a liquid level monitoring sensor is disposed in the auxiliary water tank 8 , and the liquid level monitoring sensor is electrically connected to a control device of the electric forklift.

[0099] The control device of the electric forklift is, for example, a main controller of the electric forklift.

[0100] Specifically, the auxiliary water tank 8 may be equipped with a liquid level monitoring sensor.

[0101] When the coolant level in the auxiliary water tank 8 is lower than a certain value, the level monitoring sensor will send a signal to the main controller of the vehicle, and an alarm warning of low coolant level will be displayed on the instrument panel of the electric forklift. At this time, it is necessary to manually add coolant to the auxiliary water tank 8 until the coolant level in the auxiliary water tank 8 reaches the maximum scale.

[0102] In a specific embodiment of the present application, see Figures 1 to 3The at least two heat dissipation channels include a first heat dissipation channel 16 and a second heat dissipation channel 17 arranged in parallel, and the at least two cooling tubes include a first cooling tube 1 and a second cooling tube 2 arranged in parallel, the first heat dissipation channel 16 includes a first liquid inlet 14 and a first liquid outlet 19, the second heat dissipation channel 17 includes a second liquid inlet 15 and a second liquid outlet 20, the inlet of the first cooling tube 1 is connected to the first liquid outlet 19, the outlet of the first cooling tube 1 is connected to the first liquid inlet 14, the inlet of the second cooling tube 2 is connected to the second liquid outlet 20, and the outlet of the second cooling tube 2 is connected to the second liquid inlet 15.

[0103] That is to say, the heat dissipation system provided in the embodiment of the present application can realize two circulation loops.

[0104] It should be emphasized that the heat dissipation system provided in the embodiment of the present application includes but is not limited to Figures 1 to 3 The two circulation loops shown may also include more than two circulation loops, which can provide good heat dissipation and cooling functions for heating devices with more temperature gradients.

[0105] According to the above specific embodiments, the first type of heating device 01 is configured as a plurality of heating devices which are arranged in parallel in series on the first cooling tube 1 , and / or the second type of heating device 02 is configured as a plurality of heating devices which are arranged in parallel in series on the second cooling tube 2 .

[0106] When the entire heat dissipation system includes two circulation loops, all the heating components included in the electric forklift can be divided into two categories, namely the first type of heating components 01 and the second type of heating components 02 mentioned above. Different circulation loops can be used for heat dissipation for these two types of heating components.

[0107] According to the above specific embodiments, Figure 1 and Figure 4 The diverter one-way valve 9 includes a first liquid replenishment port 23, a first one-way liquid inlet 21 and a second one-way liquid inlet 22, and the first liquid replenishment port 23 is connected to the first one-way liquid inlet 21 and the second one-way liquid inlet 22 respectively; the first liquid replenishment port 23 is connected to the first port of the auxiliary water tank 8 through a first pipe 3, the first one-way liquid inlet 21 is connected to the inlet of the first cooling pipe 1, and the second one-way liquid inlet 22 is connected to the inlet of the second cooling pipe 2.

[0108] According to the above specific embodiments, see Figure 1 and Figure 5The converging one-way valve 6 includes a second liquid replenishment port 26, a third one-way liquid inlet 24 and a fourth one-way liquid inlet 25, and the second liquid replenishment port 26 is connected to the third one-way liquid inlet 24 and the fourth one-way liquid inlet 25 respectively; the second liquid replenishment port 26 is connected to the second port of the auxiliary water tank 8 through a second pipe 4, the third one-way liquid inlet 24 is connected to the outlet of the first cooling pipe 1, and the fourth one-way liquid inlet 25 is connected to the outlet of the second cooling pipe 2.

[0109] According to the above specific embodiments, see Figure 1 The first liquid replenishing port 23 is connected with the first one-way liquid inlet 21 and the second one-way liquid inlet 22 respectively through the first shunt pipe, and the second liquid replenishing port 26 is connected with the third one-way liquid inlet 24 and the fourth one-way liquid inlet 25 respectively through the second shunt pipe. A one-way valve 5 is respectively arranged on the first shunt pipe and the second shunt pipe, and the direction of the one-way valve 5 on the first shunt pipe is opposite to that of the one-way valve 5 on the second shunt pipe.

[0110] like Figure 4 and Figure 5 , which is a schematic diagram of the diversion check valve 9 and the confluence check valve 6 , the internal and external structures of the two are the same, but the directions of the two are different.

[0111] Furthermore, the one-way valve direction of the diversion one-way valve 9 is from the first fluid replenishment port 23 to the inlet of the cooling pipe, that is, the circulation loop, while the one-way valve direction of the confluence one-way valve 6 is from the outlet of the cooling pipe, that is, the circulation loop to the second fluid replenishment port 26.

[0112] When the auxiliary water tank 8 replenishes the coolant into the circulation loop, the coolant can enter from the first refilling port 23 of the diverter check valve 9 through the first pipe 3, and enter the cooling pipe lacking coolant after passing through the check valve 5 to fill the missing coolant. At the same time, the gas in the circulation loop can pass through the second refilling port 26 of the converging check valve 6 to the auxiliary water tank 8 and escape. Among them, the use of the check valve 5 can avoid the coolant in the circulation loop from backwashing to the auxiliary water tank 8 and the gas in the auxiliary water tank 8 from being input into the circulation loop. It can also ensure that the coolants of different temperatures in the two circulation loops do not interfere with each other or mix, and the flow rate of the circulation pump of the respective circulation loop can be adjusted separately to achieve the goal of energy saving.

[0113] When using an electric forklift, the vehicle should be started to start the first circulation pump 12 and the second circulation pump 13 on each circulation loop, and coolant should be continuously added to the auxiliary water tank 8 at the same time, and the coolant continuously fills all the cooling pipes of the two circulation loops and the heating elements connected to the circulation loops through the diversion check valve 9. When the liquid level of the coolant in the auxiliary water tank 8 continues to rise and stops dropping significantly after the addition of coolant is stopped, it can be determined that the entire cooling system is full of coolant.

[0114] According to the above specific embodiment, the first type of heating device 01 and the second type of heating device 02 are electrically connected to a temperature sensor (not shown in the figure) respectively.

[0115] According to the above specific embodiments, see Figure 1 A first circulating pump 12 is provided at the inlet of the first cooling pipe 1 ; and / or a second circulating pump 13 is provided at the inlet of the second cooling pipe 2 .

[0116] According to the above specific embodiments, see Figure 1 A first temperature sensor 10 is disposed at the position of the first liquid outlet 19 of the first heat dissipation channel 16 ; and / or a second temperature sensor 11 is disposed at the position of the second liquid outlet 20 of the second heat dissipation channel 17 .

[0117] The heat dissipation system provided in the embodiment of the present application may include a radiator 7, an auxiliary water tank 8, a cooling pipe group (including at least a first cooling pipe 1 and a second cooling pipe 2 connected in parallel), and also includes components such as a circulating pump and a temperature sensor, each of which is fixed to a suitable position of the frame of the electric forklift by bolts.

[0118] According to another aspect of the present application, an electric forklift is provided, comprising the heat dissipation system as described above.

[0119] The specific implementation of the electric forklift of the embodiment of the present application can refer to the above-mentioned embodiments of the heat dissipation system, so it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0120] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0121] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A heat dissipation system, applied to an electric forklift, the electric forklift comprising a first type of heating device (01) and a second type of heating device (02) having different heat outputs during operation, Features: The heat dissipation system comprises a radiator (7) and at least two cooling pipes arranged in parallel; The radiator (7) comprises at least two heat dissipation channels arranged in parallel; The heat dissipation channel and the cooling pipe are arranged in a one-to-one correspondence and are connected to form a circulation loop; The first type of heating device (01) and the second type of heating device (02) are arranged in different cooling pipes.

2. The heat dissipation system according to claim 1, It is characterized in that The radiator (7) further comprises an air cooling component (18), wherein the air cooling component (18) is located outside the at least two heat dissipation channels.

3. The heat dissipation system according to claim 2, It is characterized in that Among the at least two heat dissipation channels, the heat dissipation channel with the smallest heat dissipation requirement is located on a side away from the air cooling component (18).

4. The heat dissipation system according to claim 2, It is characterized in that The air cooling component (18) comprises a plurality of fans arranged at intervals along the length direction of the heat dissipation channel.

5. The heat dissipation system according to claim 1, It is characterized in that The heat dissipation channel includes a liquid inlet and a liquid outlet; The cooling pipe comprises an inlet and an outlet, and the cooling pipe is filled with a coolant; The liquid outlet of the heat dissipation channel is connected to the inlet of the cooling pipe, and the liquid inlet of the heat dissipation channel is connected to the outlet of the cooling pipe to form the circulation loop.

6. The heat dissipation system according to claim 5, It is characterized in that A circulation pump is provided at the inlet of the cooling pipe.

7. The heat dissipation system according to claim 6, It is characterized in that A temperature sensor is provided at the liquid outlet of the heat dissipation channel or the inlet of the cooling pipe.

8. The heat dissipation system according to claim 5, It is characterized in that The first type of heating device and / or the second type of heating device is / are electrically connected to a temperature sensor.

9. The cooling system according to any one of claims 1 to 8, It is characterized in that The heat dissipation system further comprises an auxiliary water tank (8), a merging check valve (6) and a diverting check valve (9); The auxiliary water tank (8) comprises a first port and a second port; The first port is connected to the inlet of any cooling pipe through the diverting one-way valve (9), and the second port is connected to the outlet of any cooling pipe through the converging one-way valve (6).

10. The heat dissipation system according to claim 9, It is characterized in that In the height direction, the auxiliary water tank (8) is located above the radiator, and the auxiliary water tank (8) is filled with coolant.

11. The heat dissipation system according to claim 9, It is characterized in that A liquid level monitoring sensor is arranged in the auxiliary water tank (8), and the liquid level monitoring sensor is electrically connected to the control device of the electric forklift.

12. The heat dissipation system according to claim 9, It is characterized in that The at least two heat dissipation channels include a first heat dissipation channel (16) and a second heat dissipation channel (17) arranged in parallel; The at least two cooling pipes include a first cooling pipe (1) and a second cooling pipe (2) arranged in parallel; The first heat dissipation channel (16) comprises a first liquid inlet (14) and a first liquid outlet (19); The second heat dissipation channel (17) comprises a second liquid inlet (15) and a second liquid outlet (20). The inlet of the first cooling pipe (1) is in communication with the first liquid outlet (19), and the outlet of the first cooling pipe (1) is in communication with the first liquid inlet (14); The inlet of the second cooling pipe (2) is in communication with the second liquid outlet (20), and the outlet of the second cooling pipe (2) is in communication with the second liquid inlet (15).

13. The heat dissipation system according to claim 12, It is characterized in that The first type of heating device (01) is arranged in plurality and is arranged in series on the first cooling tube (1); and / or, The second type of heating device (02) is arranged in plurality and is arranged in series on the second cooling tube (2).

14. The heat dissipation system according to claim 13, It is characterized in that The flow-dividing one-way valve (9) comprises a first liquid replenishing port (23), a first one-way liquid inlet (21) and a second one-way liquid inlet (22); the first liquid replenishing port (23) is respectively connected to the first one-way liquid inlet (21) and the second one-way liquid inlet (22); The first liquid replenishing port (23) is connected to the first port of the auxiliary water tank (8) through a first pipe (3), the first one-way liquid inlet (21) is connected to the inlet of the first cooling pipe (1), and the second one-way liquid inlet (22) is connected to the inlet of the second cooling pipe (2).

15. The heat dissipation system according to claim 14, It is characterized in that The converging one-way valve (6) comprises a second liquid replenishing port (26), a third one-way liquid inlet (24) and a fourth one-way liquid inlet (25); the second liquid replenishing port (26) is communicated with the third one-way liquid inlet (24) and the fourth one-way liquid inlet (25) respectively; The second liquid replenishing port (26) is connected to the second port of the auxiliary water tank (8) through a second pipe (4), the third one-way liquid inlet (24) is connected to the outlet of the first cooling pipe (1), and the fourth one-way liquid inlet (25) is connected to the outlet of the second cooling pipe (2).

16. The heat dissipation system according to claim 15, It is characterized in that The first liquid replenishing port (23) is connected to the first one-way liquid inlet (21) and the second one-way liquid inlet (22) respectively through a first shunt pipe; The second liquid replenishing port (26) is connected to the third one-way liquid inlet (24) and the fourth one-way liquid inlet (25) respectively through a second shunt pipe; One-way valves (5) are respectively arranged on the first shunt pipe and the second shunt pipe, and the one-way valve (5) on the first shunt pipe is in opposite directions to the one-way valve (5) on the second shunt pipe.

17. The heat dissipation system according to claim 13, It is characterized in that The first type of heating device and the second type of heating device are electrically connected to a temperature sensor respectively.

18. The heat dissipation system according to claim 13, It is characterized in that A first circulation pump (12) is provided at the inlet of the first cooling pipe (1); and / or, A second circulation pump (13) is provided at the inlet of the second cooling pipe (2).

19. The heat dissipation system according to claim 18, It is characterized in that A first temperature sensor (10) is provided at the position of the first liquid outlet (19) of the first heat dissipation channel (16); and / or, A second temperature sensor (11) is provided at the position of the second liquid outlet (20) of the second heat dissipation channel (17).

20. An electric forklift, It is characterized in that Comprising a heat dissipation system as claimed in any one of claims 1-19.

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