Electric forklift air conditioning system and electric forklift

Abstract

The utility model relates to an air conditioning system of an electric forklift. The air conditioning system comprises a change-over switch, an evaporator, a PTC (Positive Temperature Coefficient) heater, a compressor, a condenser, a refrigeration relay and a heating relay, the compressor, the condenser and the evaporator are connected through pipelines to form a loop, a condensation fan is installed on the condenser, and an evaporation fan is installed on the evaporator. According to the electric forklift air conditioner system, the refrigerating function and the heating function can be achieved, the refrigerating function and the heating function can be switched through the change-over switch, and the working state can be easily switched according to seasons and outdoor temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of forklift air conditioners, in particular to an electric forklift heating and cooling air conditioning system and an electric forklift. Background Art

[0002] A forklift is an industrial handling vehicle, which is a variety of wheeled handling vehicles used for loading, unloading, stacking and short-distance transportation operations of palletized goods. Forklifts play a very important role in the logistics system of enterprises. They are the main force in cargo handling equipment and are widely used in various departments of the national economy such as stations, ports, airports, factories, warehouses, etc.

[0003] Due to the sensitivity of users to costs, the air conditioning refrigeration function and heating function of forklifts are currently separated. Because users in many regions only need a single function of refrigeration or heating. For example, users in Southeast Asia, the Middle East and the southern coastal cities of China have a strong demand for refrigeration and do not need the heating of the cab. However, for regions in northern China or most of Europe, they have a strong demand for cab heating. In order to minimize the procurement cost of users, the refrigeration function and heating function of the current electric forklift cab are generally separated, resulting in users being able to only choose one of the refrigeration function and heating function, and unable to meet the demand for both refrigeration and heating functions at the same time. Summary of the Utility Model

[0004] Based on this, in view of the technical problem that the refrigeration function and heating function of the current electric forklift are generally separated, resulting in users being able to only choose one of the refrigeration function and heating function and unable to meet the demand for both refrigeration and heating functions at the same time, the utility model proposes an electric forklift heating and cooling air conditioning system and an electric forklift.

[0005] An electric forklift heating and cooling air conditioning system provided by the utility model includes a changeover switch, an evaporator, a PTC heater, a compressor, a condenser, a refrigeration relay, a heating relay, a compressor relay and a PTC relay;

[0006] A circuit is formed by connecting the compressor, the condenser and the evaporator through pipelines. A condensing fan is installed on the condenser, and an evaporating fan is installed on the evaporator;

[0007] The input end of the changeover switch is connected to the positive pole of the low-voltage power supply and it has a first output end and a second output end;

[0008] Both ends of the refrigeration relay coil are respectively connected to the first output terminal and the negative pole of the low-voltage power supply. One end of the refrigeration relay contact is connected to the positive pole of the low-voltage power supply, and the other end of its contact is connected to the input terminal of the condensing fan and one end of the compressor relay coil. The other end of the compressor relay coil is connected to the negative pole of the low-voltage power supply. Both ends of the compressor relay contact are respectively connected to the positive pole of the high-voltage power supply and the input terminal of the compressor. After the output terminal of the compressor is connected to the evaporator and the condenser, it is then connected to the negative pole of the high-voltage power supply. The output terminal of the condensing fan is connected to the negative pole of the low-voltage power supply;

[0009] Both ends of the heating relay coil are respectively connected to the second output terminal and the negative pole of the low-voltage power supply. One end of the refrigeration relay contact is connected to the positive pole of the low-voltage power supply, and the other end of its contact is connected to one end of the PTC relay coil. Both ends of the PTC relay contact are respectively connected to the positive pole of the high-voltage power supply and the input terminal of the PTC heater. The output terminal of the PTC heater is connected to the negative pole of the high-voltage power supply.

[0010] The electric forklift heating and cooling air-conditioning system of the present utility model can realize the refrigeration function and the heating function, and can switch between the refrigeration function and the heating function through the change-over switch, and can easily switch the working state according to the season and the outdoor temperature.

[0011] As a further improvement of the above solution of the present utility model, the electric forklift heating and cooling air-conditioning system further includes a speed control switch, a high-grade relay, a speed control resistor one and a speed control resistor two;

[0012] The input terminal of the speed control switch is connected to the positive pole of the low-voltage power supply. The speed control switch has a high-speed output terminal, a medium-speed output terminal and a low-speed output terminal;

[0013] Both ends of the high-grade relay coil are respectively connected to the high-speed output terminal and the negative pole of the low-voltage power supply. Both ends of the high-grade relay contact are respectively connected to the positive pole of the low-voltage power supply and the input terminal of the evaporative fan. The output terminal of the evaporative fan is connected to the negative pole of the low-voltage power supply;

[0014] The input terminal of the speed control resistor one is connected to the medium-speed output terminal and its output terminal is connected to the input terminal of the evaporative fan. The input terminal of the speed control resistor two is connected to the low-speed output terminal and its output terminal is connected to the input terminal of the speed control resistor one.

[0015] As a further improvement of the above solution of the present utility model, the electric forklift heating and cooling air-conditioning system further includes a thermostat, which is connected to the circuit between the compressor relay contact and the compressor input terminal. The thermostat is used to sense the temperature of the evaporator and conduct when the temperature of the evaporator is higher than the preset temperature threshold.

[0016] As a further improvement of the above solution of the present utility model, a fuse one is provided on the circuit between the compressor relay and the positive pole of the high-voltage power supply.

[0017] As a further improvement to the above solution of the present utility model, the electric forklift heating and cooling air-conditioning system further includes an NTC thermistor, which is connected to the circuit between the PTC relay coil and the negative pole of the low-voltage power supply.

[0018] As a further improvement to the above solution of the present utility model, a second fuse is provided on the circuit between the PTC relay and the positive pole of the high-voltage power supply.

[0019] As a further improvement to the above solution of the present utility model, a first light-emitting diode and a second light-emitting diode are respectively connected to the first output terminal and the second output terminal of the changeover switch, and the first light-emitting diode and the second light-emitting diode emit lights of different colors; a third light-emitting diode, a third fuse, and a fourth fuse are provided on the circuit between the input terminal of the changeover switch and the positive pole of the low-voltage power supply.

[0020] As a further improvement to the above solution of the present utility model, a pressure switch is provided on the circuit between the coil of the refrigeration relay and the positive pole of the low-voltage power supply. The pressure switch is used to detect the pressure of the refrigerant in the pipeline between the compressor and the condenser and conduct when the pressure of the refrigeration machine is lower than the pressure threshold.

[0021] As a further improvement to the above solution of the present utility model, a fifth fuse is provided on the circuit between the contact of the refrigeration relay and the positive pole of the low-voltage power supply.

[0022] An electric forklift provided by the present utility model includes the electric forklift air-conditioning system as described above.

[0023] Compared with the prior art, the present utility model has the following beneficial effects:

[0024] 1. The electric forklift heating and cooling air-conditioning system of the present utility model can realize the refrigeration function and the heating function, and can switch between the refrigeration function and the heating function through the changeover switch, and can easily switch the working state according to the season and the outdoor temperature.

[0025] 2. The electric forklift heating and cooling air-conditioning system of the present utility model can realize the working states of high speed, medium speed or low speed of the evaporation fan by setting a speed control switch, a high gear relay, a first speed control resistor and a second speed control resistor, and can adjust the wind speed during refrigeration or heating to meet the needs of different users.

[0026] 3. The electric forklift heating and cooling air-conditioning system of the present utility model can respectively judge whether the evaporation fan circuit, the refrigeration circuit and the heating circuit are normal by setting the first light-emitting diode, the second light-emitting diode and the third light-emitting diode that can display lights of different colors, which is convenient for the timely maintenance of the system.

[0027] 4. The electric forklift heating and cooling air-conditioning system of the present utility model is provided with a pressure switch on the refrigeration circuit to control the operation of the refrigeration system according to the pressure change of the refrigerant. Brief Description of the Drawings

[0028] Figure 1 It is a schematic diagram of a heating and cooling air - conditioning system for an electric forklift provided by an embodiment of the present utility model;

[0029] Figure 2 It is a speed - regulation logic diagram of an evaporation fan in a heating and cooling air - conditioning system for an electric forklift provided by an embodiment of the present utility model;

[0030] Figure 3 It is a control logic diagram of a heating and cooling air - conditioning system for an electric forklift provided by an embodiment of the present utility model.

[0031] Reference numerals: 1. Change - over switch; 2. PTC heater; 3. Compressor; 4. Refrigeration relay; 5. Heating relay; 6. Condenser fan; 7. Evaporation fan; 8. Speed - regulation switch; 9. High - gear relay coil; 10. High - gear relay contact; 11. Speed - regulation resistor one; 12. Speed - regulation resistor two; 13. Compressor relay; 14. Thermostat; 15. Fuse one; 16. PTC relay; 17. NTC thermistor; 18. Fuse two; 19. Light - emitting diode one; 20. Light - emitting diode two; 21. Light - emitting diode three; 22. Fuse three; 23. Fuse four; 24. Fuse five; 25. Pressure switch; 26. Evaporator; 27. Condenser. Detailed Embodiment

[0032] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below in conjunction with specific embodiments. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0034] Referring to Figure 1 , this embodiment provides a heating and cooling air - conditioning system for an electric forklift, which is used for an electric forklift and includes a change - over switch 1, an evaporator, a PTC heater 2, a compressor 3, a condenser, a refrigeration relay 4 and a heating relay 5. It may also include a speed - regulation switch 8, a high - gear relay, a speed - regulation resistor one 11, a speed - regulation resistor two 12, a compressor relay 13, a thermostat 14, a PTC relay 16 and an NTC thermistor 17.

[0035] The compressor 3, condenser, and evaporator are connected by pipelines to form a loop. A condensing fan 6 is installed on the condenser, and an evaporating fan 7 is installed on the evaporator. The refrigerant circulates under the drive of the compressor 3. The compressor 3 compresses the low-pressure gaseous refrigerant into high-pressure gas, and then sends it into the condenser. In the condenser, the high-pressure refrigerant releases heat and changes from gas to liquid. The transformed high-pressure liquid refrigerant passes through the expansion valve to reduce pressure and temperature, and finally enters the evaporator. The evaporating fan 7 blows the warm air in the driver's cab of the electric forklift over the evaporator. When the air contacts the low-temperature evaporator, the heat of the air is absorbed by the refrigerant, thereby cooling the air. The cooled air is sent back into the driver's cab to complete the refrigeration process. Among them, the output end of the compressor 3 is connected to the evaporator 26 and the condenser 27 and then connected to the negative pole (-350V) of the high-voltage power supply module of the electric forklift. The output ends of the condensing fan 6 and the evaporating fan 7 are connected to the negative pole (-12V) of the low-voltage power converted by the DCDC module of the electric forklift. In this embodiment, the compressor 3 is electrically driven, getting rid of the limitation that the traditional compressor 3 must be arranged side by side with the engine when driven by the engine. The installation space position can be changed arbitrarily, and the installation method is flexible.

[0036] The input end of the speed regulation switch 8 is connected to the positive pole (+12V) of the low-voltage power converted by the DCDC module. The speed regulation switch 8 has a high-speed output end, a medium-speed output end, and a low-speed output end. The two ends of the high-grade relay coil 9 are respectively connected to the high-speed output end and the negative pole (-12V) of the low-voltage power converted by the DCDC module. The two ends of the high-grade relay contact 10 are respectively connected to the positive pole (+12V) of the low-voltage power converted by the DCDC module and the input end of the evaporating fan 7. The output end of the evaporating fan 7 is connected to the negative pole (-12V) of the low-voltage power converted by the DCDC module. The input end of the speed regulation resistor 11 is connected to the medium-speed output end and its output end is connected to the input end of the evaporating fan 7. The input end of the speed regulation resistor 12 is connected to the low-speed output end and its output end is connected to the input end of the speed regulation resistor 11. Through the above settings, combined with Figure 2 , when the high-speed output end of the speed regulation switch 8 is turned on, the coil of the high-grade relay is energized, and the contact of the high-grade relay is closed, and the evaporating fan 7 starts to run at high speed; when the medium-speed output end of the speed regulation switch 8 is turned on, a loop is formed between the evaporating fan 7 and the speed regulation resistor 11. Since the speed regulation resistor 11 is connected in series, the voltage of the loop is divided by the speed regulation resistor 11 at this time, and the working power of the evaporating fan 7 is reduced, so the speed of the evaporating fan 7 is reduced to run at medium speed; when the medium-speed output end of the speed regulation switch 8 is turned on, a loop is formed between the evaporating fan 7, the speed regulation resistor 11, and the speed regulation resistor 12. Since the speed regulation resistor 11 and the speed regulation resistor 12 are connected in series, the voltage of the loop is divided by the speed regulation resistor 11 and the speed regulation resistor 12 at this time, and the working power of the evaporating fan 7 is further reduced, so the speed of the evaporating fan 7 is further reduced to run at low speed.

[0037] The input terminal of the changeover switch 1 is connected to the positive pole of the low-voltage power supply (+12V) converted by the DCDC module. On the circuit between the input terminal of the changeover switch 1 and the positive pole of the low-voltage power supply (+12V), there are a light-emitting diode three 21, a fuse three 22, and a fuse four 23, and the light-emitting diode three 21 emits yellow light. The changeover switch 1 has a first output terminal and a second output terminal, and a light-emitting diode one 19 and a light-emitting diode two 20 are respectively connected to the first output terminal and the second output terminal. The light-emitting diode one 19 emits green light, and the light-emitting diode two 20 emits red light.

[0038] One end of the coil of the refrigeration relay 4 is connected to the light-emitting diode one 19 and the other end is connected to the input terminal of the pressure switch 25. The output terminal of the pressure switch 25 is connected to the negative pole of the low-voltage power supply (-12V) converted by the DCDC module. The pressure switch 25 is used to detect the pressure of the refrigerant in the pipeline between the compressor 3 and the condenser and conduct when the pressure of the refrigerant is lower than the pressure threshold. One end of the contact of the refrigeration relay 4 is connected to the positive pole of the low-voltage power supply (+12V) through a fuse five 24, and the other end of the contact of the refrigeration relay 4 is connected to the input terminal of the condensing fan 6. Both ends of the coil of the compressor relay 13 are respectively connected to one end of the contact of the refrigeration relay 4 and the negative pole of the low-voltage power supply (-12V) converted by the DCDC module. One end of the contact of the compressor relay 13 is connected to the positive pole of the high-voltage power supply (+350V) of the electric forklift power module through a fuse one 15 and the other end is connected to the input terminal of the temperature controller 14. The output terminal of the temperature controller 14 is connected to the input terminal of the compressor 3. Through the above settings, combined with Figure 3 , when the changeover switch 1 is connected to the first output terminal and the pressure switch 25 is closed when the pressure of the refrigerant in the refrigeration system is within the normal range, the coil of the refrigeration relay 4 is energized, the light-emitting diode one 19 emits green light, the contact of the refrigeration relay 4 is closed, and the condensing fan 6 starts to work; at the same time, after the contact of the refrigeration relay 4 is closed, the coil of the compressor relay 13 is energized, so that the contact of the compressor relay 13 is closed to connect the +350V high-voltage power, and the compressor 3 is powered on to work for refrigeration. The temperature controller 14 monitors the temperature at the outlet of the evaporator. When the temperature at the outlet of the evaporator reaches the set temperature S1, the temperature controller 14 is disconnected, the circuit of the compressor 3 is disconnected, and the compressor 3 stops working; when the temperature at the outlet of the evaporator is higher than the set temperature S2 (S2 > S1, and both are above-zero temperatures), the temperature controller 14 conducts and connects the circuit of the compressor 3. When the pressure of the refrigerant is not within the normal pressure range, the pressure switch 25 will be disconnected, cutting off the refrigeration system. The pressure switch 25 is a safety device for protecting the refrigeration system, and it can control the operating state of the system by monitoring the pressure change of the refrigerant.

[0039] One end of the coil of the heating relay 5 is connected to the light-emitting diode two 20, and the other end is connected to the negative pole of the low-voltage power supply (-12V). One end of the contact of the refrigeration relay 4 is connected to the light-emitting diode three 21, and the other end is connected to one end of the coil of the PTC relay 16. The other end of the coil of the PTC relay 16 is connected to the input end of the NTC thermistor 17. The output end of the NTC thermistor 17 is connected to the negative pole of the high-voltage power supply (-350V). One end of the contact of the PTC relay 16 is connected to the positive pole of the high-voltage power supply (+350V) through the fuse two 18, and the other end is connected to the input end of the PTC heater 2. The output end of the PTC heater 2 is connected to the negative pole of the high-voltage power supply (-350V). Through the above settings, combined with Figure 3 , when the change-over switch 1 is turned on to the second output terminal, the coil of the heating relay 5 is energized, the contact of the heating relay 5 is closed, the coil of the PTC relay 16 is energized and the contact of the PTC relay 16 is closed, the PTC heater 2 is connected to the +350V high-voltage power supply, and the PTC heater 2 works for heating. The NTC thermistor 17 is set. When the temperature of the PTC heater 2 exceeds the temperature T1, the PTC relay 16 is automatically cut off, thereby preventing the PTC heater 2 from continuing to cause a fire. When the temperature of the NTC thermistor 17 drops to the temperature T2 (T2 is less than T1), the PTC relay 16 is restored, and thus the PTC heating system resumes heating.

[0040] Through the above structure, the working principle of the electric forklift condensation air-conditioning system of this embodiment is as follows:

[0041] Refrigeration: When the pressure switch 25 is in the normal working state, the input end of the change-over switch 1 is connected to the first output terminal, the light-emitting diode one 19 lights up and emits green light, the coil of the refrigeration relay 4 is energized, at this time the contact of the refrigeration relay 4 is closed, the condensation fan 6 starts to work, and the coil of the compressor relay 13 is energized, the contact of the compressor relay 13 is closed, and then the compressor 3 is connected to the 350V high-voltage power supply and starts to work, and the evaporator continuously refrigerates; the speed of the evaporation fan 7 is switched through the speed control switch 8, and the evaporation fan 7 blows the cold air of the evaporator into the cab for cooling.

[0042] Heating: The input end of the change-over switch 1 is connected to the second output terminal, the light-emitting diode two 20 lights up and emits red light, the coil of the heating relay 5 is energized, the contact of the heating relay 5 is closed, so that the coil of the PTC relay 16 is energized, the contact of the PTC relay 16 is closed, and then the PTC heater 2 is connected to the 350V high-voltage power supply and starts to work to generate heat. The speed of the evaporation fan 7 is switched through the speed control switch 8, and the evaporation fan 7 blows the heat of the PTC heater 2 into the cab for heating up.

[0043] As long as the evaporation fan 7 is in the working state, the light-emitting diode III 21 in the circuit is always lit and emits yellow light. Therefore, the light-emitting diode III 21 can be used to judge the faults in the evaporation fan 7 circuit. The light-emitting diode I 19 and the light-emitting diode II 20 can be used to detect the faults in the refrigeration and heating systems respectively.

[0044] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0045] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. An electric forklift heating and cooling air conditioning system, characterized in that: The cooling and heating air conditioning system comprises a switch (1), an evaporator (26), a PTC heater (2), a compressor (3), a condenser (27), a cooling relay (4), a heating relay (5), a compressor relay (13) and a PTC relay (16); The compressor (3), the condenser (27) and the evaporator (26) are connected by pipelines to form a loop, the condenser (27) is equipped with a condensing fan (6), and the evaporator (26) is equipped with an evaporating fan (7); The input end of the switch (1) is connected to the positive electrode of the low voltage and has a first output end and a second output end; The two ends of the refrigeration relay (4) coil are respectively connected to the first output end and the low-voltage negative electrode, one end of the refrigeration relay (4) contact is connected to the low-voltage positive electrode and the other end of the contact is connected to the input end of the condensing fan (6) and one end of the compressor relay (13) coil, the other end of the compressor relay (13) coil is connected to the low-voltage negative electrode, the two ends of the compressor relay (13) contact are respectively connected to the high-voltage positive electrode and the input end of the compressor (3), the output end of the compressor (3) is connected to the evaporator (26) and the condenser (27) and then connected to the high-voltage negative electrode, and the output end of the condensing fan (6) is connected to the low-voltage negative electrode; The two ends of the heating relay (5) coil are respectively connected to the second output end and the low-voltage negative electrode, one end of the heating relay (5) contact is connected to the low-voltage positive electrode and the other end of its contact is connected to one end of the PTC relay (16) coil, the two ends of the PTC relay (16) contact are respectively connected to the high-voltage positive electrode and the input end of the PTC heater (2), and the output end of the PTC heater (2) is connected to the high-voltage negative electrode.

2. The electric forklift heating and cooling air conditioning system according to claim 1, characterized in that: The electric forklift heating and cooling air conditioning system also includes a speed regulating switch (8), a high-end relay, a speed regulating resistor 1 (11) and a speed regulating resistor 2 (12); The input end of the speed regulating switch (8) is connected to the positive electrode of the low voltage electricity, and the speed regulating switch (8) has a high-speed output end, a medium-speed output end and a low-speed output end; The two ends of the high-end relay coil (9) are respectively connected to the high-speed output end and the low-voltage negative electrode, the two ends of the high-end relay contact (10) are respectively connected to the low-voltage positive electrode and the input end of the evaporation fan (7), and the output end of the evaporation fan (7) is connected to the low-voltage negative electrode; The input end of the speed regulating resistor 1 (11) is connected to the medium speed output end and its output end is connected to the input end of the evaporating fan (7), and the input end of the speed regulating resistor 2 (12) is connected to the low speed output end and its output end is connected to the input end of the speed regulating resistor 1 (11).

3. The electric forklift heating and cooling air conditioning system according to claim 1, characterized in that: The electric forklift heating and cooling air conditioning system further comprises a thermostat (14), which is connected to a circuit between a contact of a compressor relay (13) and an input end of a compressor (3), and the thermostat (14) is used to sense the temperature of an evaporator (26) and is turned on when the temperature of the evaporator (26) is higher than a preset temperature threshold.

4. The electric forklift heating and cooling air conditioning system according to claim 3, characterized in that: A fuse (15) is provided on the circuit between the compressor relay (13) and the high voltage positive electrode.

5. The electric forklift heating and cooling air conditioning system according to claim 1, characterized in that: The electric forklift heating and cooling air conditioning system also includes an NTC thermistor (17), which is connected to the circuit between the PTC relay (16) coil and the low-voltage negative electrode.

6. The electric forklift heating and cooling air conditioning system according to claim 1, characterized in that: A second fuse (18) is provided on the circuit between the PTC relay (16) and the positive electrode of the high voltage electricity.

7. The electric forklift heating and cooling air conditioning system according to claim 1, characterized in that: The first output end and the second output end of the switching switch (1) are respectively connected to a light emitting diode (19) and a light emitting diode (20), and the light emitting diode (19) and the light emitting diode (20) emit lights of different colors; a light emitting diode (21), a fuse (22) and a fuse (23) are arranged on the circuit between the input end of the switching switch (1) and the positive electrode of the low voltage, and the light emitting diode (21) emits a light of a different color from the light emitting diode (19) and the light emitting diode (20).

8. The electric forklift heating and cooling air conditioning system according to claim 1, characterized in that: A fuse 5 (24) is provided on the circuit between the contact of the refrigeration relay (4) and the positive electrode of the low-voltage electricity.

9. The electric forklift heating and cooling air conditioning system according to claim 1, characterized in that: A pressure switch (25) is provided on the circuit between the coil of the refrigeration relay (4) and the negative electrode of the low-voltage electric pole. The pressure switch (25) is used to detect the pressure of the refrigerant in the pipeline between the compressor (3) and the condenser (27) and is turned on when the pressure of the refrigerator is lower than a pressure threshold.

10. An electric forklift, characterized in that: It comprises the electric forklift air conditioning system as claimed in any one of claims 1 to 9.

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