CN117325646A - Water cooling system for high-voltage electric forklift and high-voltage electric forklift - Google Patents
Water cooling system for high-voltage electric forklift and high-voltage electric forklift Download PDFInfo
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- CN117325646A CN117325646A CN202311358276.2A CN202311358276A CN117325646A CN 117325646 A CN117325646 A CN 117325646A CN 202311358276 A CN202311358276 A CN 202311358276A CN 117325646 A CN117325646 A CN 117325646A
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- voltage electric
- secondary refrigerant
- cooling system
- water cooling
- electric forklift
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- 238000001816 cooling Methods 0.000 title claims abstract description 120
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000003507 refrigerant Substances 0.000 claims abstract description 84
- 239000002826 coolant Substances 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 description 10
- 230000017525 heat dissipation Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07595—Cooling arrangements for device or operator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
- B60K2001/005—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric storage means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
- B60K2001/006—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric motors
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Sustainable Development (AREA)
- Power Engineering (AREA)
- Civil Engineering (AREA)
- Sustainable Energy (AREA)
- Geology (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention relates to the technical field of engineering machinery, and provides a water cooling system for a high-voltage electric forklift and the high-voltage electric forklift, wherein the water cooling system for the high-voltage electric forklift comprises a refrigerant loop, a secondary refrigerant loop and a first cooling loop, the refrigerant loop is used for circulating refrigerant, and the refrigerant loop comprises a compressor, a condenser, an expansion valve and an evaporator which are connected in sequence; the secondary refrigerant loop is used for circulating and circulating secondary refrigerant, the secondary refrigerant comprises a first power pump and a first containing box for storing the secondary refrigerant, and the first containing box is connected with the evaporator through the first power pump; the first cooling loop is directly connected to the first accommodating box, the first cooling loop is provided with a heat exchanger and a second power pump, the heat exchanger is used for heat exchange between the coolant and the power battery and/or the motor, and the second power pump is arranged to drive the coolant to circulate in the first cooling loop. So set up, solved the cooling problem of high-voltage electric fork truck among the prior art.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a water cooling system for a high-voltage electric forklift and the high-voltage electric forklift.
Background
The electric forklift is a forklift which uses a power battery as a power source to drive a motor of a traveling system and a motor of a hydraulic system, thereby realizing traveling and loading and unloading operations. At present, the mainstream electric fork-lift in the market is a low-voltage vehicle, the heat generation amount is low, and the electric fork-lift is not matched with a cooling system, so that the motor of a running system and the motor of an oil pressure system can naturally dissipate heat and cool.
The work efficiency of the low-voltage vehicle in the prior art is low, in order to improve the work efficiency of the electric forklift, a high-voltage lithium battery is adopted as a power source in some technologies to form the high-voltage vehicle, but the high-voltage vehicle has larger heat generation amount in the operation process, and the heat dissipation and cooling efficiency are lower when the high-voltage vehicle relies on natural heat dissipation and cooling, so that the power battery and the motor cannot work at the optimal working temperature, and the normal operation of the high-voltage vehicle can be influenced when the temperature of the power battery and the motor is too high, and potential safety hazards exist.
Therefore, how to solve the cooling problem of the high-voltage electric forklift in the prior art becomes an important technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention provides a water cooling system for a high-voltage electric forklift and the high-voltage electric forklift, which are used for solving the defect of cooling of the high-voltage electric forklift in the prior art.
The invention provides a water cooling system for a high-voltage electric forklift, which comprises the following components:
the refrigerant loop is used for circulating the refrigerant and comprises a compressor, a condenser, an expansion valve and an evaporator which are sequentially connected;
the secondary refrigerant loop is used for circulating and circulating secondary refrigerant, the secondary refrigerant comprises a first power pump and a first containing box for storing the secondary refrigerant, and the first containing box is connected with the evaporator through the first power pump;
the first cooling circuit is directly connected to the first accommodating box, a heat exchanger and a second power pump are arranged on the first cooling circuit, the heat exchanger is used for carrying out heat exchange between the secondary refrigerant and the power battery and/or the motor, and the second power pump is arranged to drive the secondary refrigerant to circulate in the first cooling circuit.
According to the water cooling system for the high-voltage electric forklift, the motor comprises the driving motor and the oil pump motor, three heat exchangers are arranged, and one heat exchanger is respectively and correspondingly arranged on the power battery, the driving motor and the oil pump motor.
According to the water cooling system for the high-voltage electric forklift, two first cooling loops are arranged, the heat exchanger corresponding to the power battery is arranged in one of the first cooling loops, and the heat exchangers corresponding to the driving motor and the oil pump motor are arranged in series and in the other first cooling loop.
According to the water cooling system for the high-voltage electric forklift provided by the invention, the water cooling system further comprises:
the second cooling loop is directly connected with the first accommodating box, a second power pump and the second accommodating box are arranged on the second cooling loop, and the second power pump is arranged to drive the secondary refrigerant to circulate in the second cooling loop;
the first fan is arranged to circulate air around the second accommodating box into the cab of the high-voltage electric forklift.
According to the water cooling system for the high-voltage electric forklift, the second cooling circuit is further provided with the heating device, and the heating device is arranged to be capable of heating the secondary refrigerant in the second cooling circuit.
According to the water cooling system for the high-voltage electric forklift provided by the invention, the water cooling system further comprises:
and a second fan configured to circulate gas around the condenser in a direction away from the condenser.
According to the water cooling system for the high-voltage electric forklift provided by the invention, the water cooling system further comprises:
a first temperature detecting element for detecting a temperature of the coolant in the first containing tank;
the control device is arranged to control the compressor and the first power pump to stop running when the temperature of the secondary refrigerant in the first accommodating box is lower than a first preset value, and to send out a high-temperature alarm prompt when the temperature of the secondary refrigerant in the first accommodating box is higher than a second preset value.
According to the water cooling system for the high-voltage electric forklift provided by the invention, the water cooling system further comprises:
the liquid level detection element is used for detecting the liquid level in the first accommodating box and is electrically connected with the control device, and the control device is arranged to send out a low liquid level alarm prompt when the liquid level in the first accommodating box is lower than a third preset value.
According to the water cooling system for the high-voltage electric forklift provided by the invention, the water cooling system further comprises:
and the second temperature detection element is used for detecting the temperature at the secondary refrigerant outlet of the evaporator.
The invention also provides a high-voltage electric forklift, which comprises the water cooling system for the high-voltage electric forklift.
The invention provides a water cooling system for a high-voltage electric forklift, which comprises a refrigerant loop, a secondary refrigerant loop and a first cooling loop, wherein the refrigerant loop is used for circulating refrigerant, the refrigerant loop comprises a compressor, a condenser, an expansion valve and an evaporator which are sequentially connected, and the refrigerant compressed by the compressor is evaporated and absorbed in the evaporator after passing through the heat dissipation process of the condenser and the throttling process of the expansion valve. The secondary refrigerant loop is used for supplying secondary refrigerant to circulate, the secondary refrigerant comprises a first power pump and a first containing box, the first containing box is connected to the evaporator through the first power pump, the first containing box is used for storing the secondary refrigerant, the first power pump is used for driving the secondary refrigerant to circulate in the secondary refrigerant loop, when the secondary refrigerant passes through the evaporator, heat of the secondary refrigerant is absorbed by the refrigerant and the temperature of the secondary refrigerant is reduced, and the cooled secondary refrigerant circulates into the first containing box. The first cooling loop is directly connected to the first accommodating box, the first cooling loop is provided with a heat exchanger and a second power pump, the second power pump is used for driving the secondary refrigerant to circulate in the first cooling loop, and when the secondary refrigerant circulates to the heat exchanger, the secondary refrigerant can exchange heat with the power battery and/or the motor, so that the temperature of the power battery and/or the motor is reduced. So set up, the first holds the incasement and stores the secondary refrigerant, and the compressor continuous operation can constantly carry the cold volume to first holds the incasement to can reduce the temperature of the secondary refrigerant in the first holds the incasement to lower temperature. When the power battery and/or the motor needs to be cooled, the first power pump is used for driving the secondary refrigerant in the first accommodating box to circulate to the heat exchanger, the temperature of the secondary refrigerant is lower, the power battery and/or the motor can be impacted by the temperature, the cooling efficiency and the cooling capacity are improved, the cooling of the high-voltage electric forklift can be ensured, and the cooling problem of the high-voltage electric forklift in the prior art is solved.
Further, the high-voltage electric forklift provided by the present invention is provided with the water cooling system for the high-voltage electric forklift, and therefore, the high-voltage electric forklift also has various advantages as described above.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a water cooling system for a high voltage electric fork lift truck provided by the present invention;
fig. 2 is a schematic structural diagram of a water cooling system for a high-voltage electric forklift.
Reference numerals:
1. a compressor; 2. a condenser; 3. an expansion valve; 4. an evaporator; 5. a first power pump; 6. a first accommodation box; 7. a heat exchanger; 8. a second power pump; 9. a third power pump; 10. a second accommodation box; 11. a first fan; 12. a heating device; 13. a second fan; 14. and a power battery.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The water cooling system for a high-voltage electric forklift according to the present invention is described below with reference to fig. 1 to 2.
As shown in fig. 1 to 2, a water cooling system for a high-voltage electric forklift provided by an embodiment of the present invention includes a refrigerant circuit, a coolant circuit, and a first cooling circuit.
Specifically, the refrigerant circuit is used for circulating the refrigerant, and comprises a compressor 1, a condenser 2, an expansion valve 3 and an evaporator 4 which are sequentially connected, wherein the refrigerant compressed by the compressor 1 is evaporated and absorbed in the evaporator 4 after passing through a heat dissipation process of the condenser 2 and a throttling process of the expansion valve 3.
The secondary refrigerant circuit is used for circulating and circulating secondary refrigerant, the secondary refrigerant comprises a first power pump 5 and a first accommodating box 6, and the first accommodating box 6 is connected with the evaporator 4 through the first power pump 5. The first accommodating box 6 is used for storing the secondary refrigerant, and the first power pump 5 is used for driving the secondary refrigerant to circulate in the secondary refrigerant circuit. When the coolant passes through the evaporator 4, the heat of the coolant is absorbed by the coolant and the temperature thereof is lowered, and the cooled coolant flows into the first housing tank 6.
The first cooling circuit is directly connected to the first housing tank 6, on which a heat exchanger 7 and a second power pump 8 are arranged. The second power pump 8 is used for driving the secondary refrigerant to circulate in the first cooling loop, and when the secondary refrigerant circulates to the heat exchanger 7, the secondary refrigerant can exchange heat with the power battery 14 and/or the motor, so as to reduce the temperature of the power battery 14 and/or the motor.
By such arrangement, the coolant is stored in the first accommodating tank 6, and the compressor 1 continuously works to continuously convey cold to the first accommodating tank 6, so that the temperature of the coolant in the first accommodating tank 6 can be reduced to a lower temperature. When the power battery 14 and/or the motor is required to be cooled, the first power pump 5 is used for driving the secondary refrigerant in the first accommodating box 6 to circulate to the heat exchanger 7, the temperature of the secondary refrigerant is lower, the power battery 14 and/or the motor can be impacted by the temperature, the cooling efficiency and the cooling capacity are improved, the cooling of the high-voltage electric forklift can be ensured, and the cooling problem of the high-voltage electric forklift in the prior art is solved.
The electric forklift has a drive motor for driving travel and an oil pump motor for driving loading and unloading. Correspondingly, in the embodiment of the invention, the heat exchanger 7 comprises three heat exchangers 7, which respectively correspond to the power battery 14, the driving motor and the oil pump motor. The heat exchangers 7 corresponding to the power batteries 14 are used for heat exchange between the coolant and the power batteries 14, the heat exchangers 7 corresponding to the driving motors are used for heat exchange between the coolant and the driving motors, the heat exchangers 7 corresponding to the oil pump motors are used for heat exchange between the coolant and the oil pump motors, and the power batteries 14 and the motors are subjected to heat exchange and temperature reduction by utilizing different heat exchangers 7.
The driving motor and the oil pump motor can be two-in-one motors, namely, the driving motor comprises a driving motor body and a controller connected with the driving motor body, and the oil pump motor comprises an oil pump motor body and a controller connected with the oil pump motor body. The same heat exchanger 7 is utilized to cool down the driving motor body and the controller connected to the driving motor body simultaneously, and the same heat exchanger 7 is utilized to cool down the oil pump motor body and the controller connected to the oil pump motor body simultaneously.
The heat generation amounts of the power battery 14 and the motor are different, and the charge and discharge of the power battery 14 and the operation of the motor may not be performed simultaneously, and thus, the cooling requirements of the power battery 14 and the motor are different. In the embodiment of the invention, two first cooling circuits are arranged, the heat exchanger 7 corresponding to the power battery 14 is arranged in one of the first cooling circuits, and the heat exchangers 7 corresponding to the driving motor and the oil pump motor are arranged in series and in the other first cooling circuit.
The two first cooling loops are used for cooling the power battery 14 and the motor separately, a water cooling system for the high-voltage electric forklift can be controlled as required, so that the power battery 14 and the motor can work in an optimal working temperature range, and the service lives of the power battery 14 and the motor can be prolonged.
The high-voltage electric forklift works outdoors under relatively severe working conditions, and in order to improve the comfort inside the cab of the electric forklift, the function of refrigerating or heating the cab is added in the embodiment of the invention.
In this embodiment, the water cooling system for the high-voltage electric forklift further includes a second cooling circuit and a first fan 11.
The second cooling circuit is directly connected to the first accommodating box 6, and a third power pump 9 and a second accommodating box 10 are arranged on the second cooling circuit, wherein the third power pump 9 can drive the secondary refrigerant to circulate from the first accommodating box 6 to the second accommodating box 10 and circulate from the second accommodating box 10 to the first accommodating box 6, so that the secondary refrigerant circulates in the second cooling circuit.
The first fan 11 is disposed outside the second housing case 10, and is configured to circulate air around the second housing case 10 into the cab of the high-voltage electric forklift, promote air circulation, and improve the cooling efficiency of the cab.
The first fan 11 adopts the induced draft fan to the induced draft side of first fan 11 holds case 10 towards the second, utilizes the mode of induced drafting to hold the cold volume of case 10 with the second and carries to the inside of driver's cabin, is favorable to improving the air-out effect.
The rotation speed of the first fan 11 may be controlled in steps to adjust the air outlet speed.
In a further embodiment, a heating device 12 is also provided on the second cooling circuit for heating the coolant in the second cooling circuit. When the cab needs to be heated, the heating device 12 can be controlled to be turned on, and the coolant passing through the second cooling circuit can be heated by the heating device 12. When the cab is not required to be heated, the heating device 12 may be controlled to be turned off.
The heating device 12 may be, but is not limited to, a PTC heater.
In this embodiment, the water cooling system for the high-voltage electric forklift further includes a second fan 13, where the second fan 13 is disposed around the condenser 2, and is configured to circulate the gas around the condenser 2 in a direction away from the condenser 2, so as to promote heat dissipation of the condenser 2 and improve refrigeration efficiency of the refrigerant circuit.
It should be noted that, when the water cooling system for the high-voltage electric forklift is started each time, the second fan 13 needs to be reversed for a certain time to remove dust.
In the embodiment of the invention, the water cooling system for the high-voltage electric forklift further comprises a first temperature detection element and a control device, wherein the first temperature detection element is used for detecting the temperature of the secondary refrigerant in the first accommodating box 6, the first temperature detection element, the compressor 1 and the first power pump 5 are electrically connected with the control device, and the control device can control the start and stop of the compressor 1 and the first power pump 5 according to the temperature detected by the first temperature detection element. When the temperature of the coolant in the first housing tank 6 is lower than a first preset value, the compressor 1 and the first power pump 5 are controlled to stop operating, and the delivery of the cold to the first housing tank 6 is stopped. When the temperature of the secondary refrigerant in the first accommodating box 6 is higher than a second preset value, a high-temperature alarm prompt is sent out, and the water cooling system for the high-voltage electric forklift for the staff is prompted to be incapable of meeting the cooling requirement of the high-voltage electric forklift at present, so that the driver can control the start and stop of the high-voltage electric forklift as required.
It should be noted that the first preset value may be 25 degrees celsius, and the temperature of the cold night in the first accommodating box 6 may be controlled to be 25-35 degrees celsius. The second preset value may be 50 ℃, and when the temperature of the cold night in the first accommodating box 6 is higher than 50 ℃, a high-temperature alarm prompt is sent.
In a further embodiment, the water cooling system for a high voltage electric fork lift truck further comprises a liquid level detection element for detecting the liquid level in the first housing tank 6. The liquid level detection element is electrically connected with the control device, and when the liquid level in the first accommodating box 6 is lower than a third preset value, a low liquid level alarm prompt is sent out to remind a driver of supplementing the secondary refrigerant into the first accommodating box 6.
In some embodiments, the water cooling system for a high voltage electric fork lift truck further comprises a third containment tank for containing coolant, a control valve, and a fourth power pump, the third containment tank being connected to the first containment tank 6 by a conduit. The control valve and the fourth power pump are arranged between the third accommodating box and the first accommodating box 6, and when the control valve is in an open state, the fourth power pump can be used for conveying the secondary refrigerant in the third accommodating box to the first accommodating box 6 so as to supplement the secondary refrigerant to the secondary refrigerant circuit.
The control valve and the fourth power pump can be electrically connected with the control device, when the liquid level detection element detects that the liquid level of the first accommodating box 6 is lower than a third preset value, the control device controls the control valve to be opened and controls the fourth power pump to operate so as to supplement the coolant in the third accommodating box to the first accommodating box 6 until the liquid level in the first accommodating box 6 is higher than the third preset value, and the control device controls the fourth power pump to stop operating and controls the control valve to be closed.
In the implementation of the invention, the water cooling system for the high-voltage electric fork-lift truck also comprises a second temperature detection element for detecting the temperature at the coolant outlet of the evaporator 4. According to the temperature at the coolant outlet of the evaporator 4, it can be determined whether the coolant loop is operating normally, facilitating maintenance of the water cooling system for the high voltage electric fork lift truck.
It should be noted that, when the temperature at the coolant outlet of the evaporator 4 is in the range of 15 to 20 degrees celsius, the refrigerant circuit is considered to be operating normally.
The water cooling system for the high-voltage electric forklift further comprises a third temperature detecting element for detecting the temperature of the condenser 2. According to the temperature of the condenser 2, whether the refrigerant loop is in normal operation or not can be determined, and the maintenance of a water cooling system for a high-voltage electric forklift is facilitated.
The water cooling system for the high-voltage electric forklift provided by the embodiment of the invention fills the technical blank of the water cooling system of the electric forklift, and the water cooling system for the high-voltage electric forklift can cool down the power battery 14 in the charging process of the power battery 14 and can cool down the power battery 14 in the discharging process of the power battery 14. When the power battery 14 is cooled in the charging process of the power battery 14, the power battery 14 can be in an optimal temperature range, which is beneficial to improving the charging efficiency of the power battery 14 and shortening the charging time of the power battery 14.
On the other hand, the embodiment of the invention also provides a high-voltage electric forklift, which comprises the water cooling system for the high-voltage electric forklift. The water cooling system for the high-voltage electric forklift in the embodiment has higher cooling efficiency and cooling capacity, and can ensure cooling of the high-voltage electric forklift. Therefore, the high-voltage electric forklift provided by the embodiment of the invention has higher refrigeration efficiency and working efficiency. The deduction process of the beneficial effects of the high-voltage electric forklift in the embodiment of the invention is generally similar to the deduction process of the beneficial effects of the water cooling system for the high-voltage electric forklift, so that the description is omitted here.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A water cooling system for a high voltage electric fork lift truck, comprising:
the refrigerant loop is used for circulating the refrigerant and comprises a compressor, a condenser, an expansion valve and an evaporator which are sequentially connected;
the secondary refrigerant loop is used for circulating and circulating secondary refrigerant, the secondary refrigerant comprises a first power pump and a first containing box for storing the secondary refrigerant, and the first containing box is connected with the evaporator through the first power pump;
the first cooling circuit is directly connected to the first accommodating box, a heat exchanger and a second power pump are arranged on the first cooling circuit, the heat exchanger is used for carrying out heat exchange between the secondary refrigerant and the power battery and/or the motor, and the second power pump is arranged to drive the secondary refrigerant to circulate in the first cooling circuit.
2. The water cooling system for a high-voltage electric forklift as claimed in claim 1, wherein the motor comprises a driving motor and an oil pump motor, the three heat exchangers are provided, and the power battery, the driving motor and the oil pump motor are respectively provided with one heat exchanger.
3. The water cooling system for a high-voltage electric forklift according to claim 2, wherein two first cooling circuits are provided, the heat exchanger corresponding to the power battery is provided in one of the first cooling circuits, and the heat exchangers corresponding to the driving motor and the oil pump motor are provided in series and in the other first cooling circuit.
4. The water cooling system for a high voltage electric fork lift truck of claim 1, further comprising:
the second cooling loop is directly connected with the first accommodating box, a third power pump and the second accommodating box are arranged on the second cooling loop, and the third power pump is arranged to drive the secondary refrigerant to circulate in the second cooling loop;
the first fan is arranged to circulate air around the second accommodating box into the cab of the high-voltage electric forklift.
5. A water cooling system for a high voltage electric lift truck as recited by claim 4 wherein said second cooling circuit is further provided with a heating device configured to heat said coolant within said second cooling circuit.
6. The water cooling system for a high voltage electric fork lift truck of claim 1, further comprising:
and a second fan configured to circulate gas around the condenser in a direction away from the condenser.
7. The water cooling system for a high voltage electric fork lift truck of claim 1, further comprising:
a first temperature detecting element for detecting a temperature of the coolant in the first containing tank;
the control device is arranged to control the compressor and the first power pump to stop running when the temperature of the secondary refrigerant in the first accommodating box is lower than a first preset value, and to send out a high-temperature alarm prompt when the temperature of the secondary refrigerant in the first accommodating box is higher than a second preset value.
8. The water cooling system for a high voltage electric fork lift truck of claim 7, further comprising:
the liquid level detection element is used for detecting the liquid level in the first accommodating box and is electrically connected with the control device, and the control device is arranged to send out a low liquid level alarm prompt when the liquid level in the first accommodating box is lower than a third preset value.
9. The water cooling system for a high voltage electric fork lift truck of claim 7, further comprising:
and the second temperature detection element is used for detecting the temperature at the secondary refrigerant outlet of the evaporator.
10. A high voltage electric fork lift truck comprising a water cooling system for a high voltage electric fork lift truck as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311358276.2A CN117325646A (en) | 2023-10-19 | 2023-10-19 | Water cooling system for high-voltage electric forklift and high-voltage electric forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311358276.2A CN117325646A (en) | 2023-10-19 | 2023-10-19 | Water cooling system for high-voltage electric forklift and high-voltage electric forklift |
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| CN117325646A true CN117325646A (en) | 2024-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311358276.2A Pending CN117325646A (en) | 2023-10-19 | 2023-10-19 | Water cooling system for high-voltage electric forklift and high-voltage electric forklift |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118560342A (en) * | 2024-06-14 | 2024-08-30 | 北京肃为电器设备有限公司 | Battery thermal management system and thermal management method for electric forklift |
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2023
- 2023-10-19 CN CN202311358276.2A patent/CN117325646A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118560342A (en) * | 2024-06-14 | 2024-08-30 | 北京肃为电器设备有限公司 | Battery thermal management system and thermal management method for electric forklift |
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