Electric freight vehicle with temperature adjusting device

Abstract

The utility model provides an electric freight vehicle with temperature adjusting equipment, the temperature adjusting equipment comprises a compressor, an evaporator and a condenser which are connected through a refrigerant pipeline, and also comprises a PTC (Positive Temperature Coefficient) device, a warm air core and a pump which are connected through a coolant pipeline, the compressor is a compressor with single refrigerating capacity of more than 10KW, and the evaporator is a single compressor with single refrigerating capacity of more than 10KW. The evaporators comprise the first evaporator and the second evaporator, the first evaporator is in straight-through connection with the compressor and the condenser, the second evaporator is connected with the compressor and the condenser through an electromagnetic valve, and the electromagnetic valve is arranged in the mode that refrigerants only pass through the first evaporator or simultaneously pass through the first evaporator and the second evaporator in a controlled mode. The first evaporator and the second evaporator are arranged in a cab of the electric freight vehicle. According to the electric freight vehicle provided by the utility model, the temperature can be quickly adjusted under the extreme temperature condition.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric machinery used in freight distribution centers, in particular to the technical field of thermal management of electric freight vehicles used in freight distribution centers. BACKGROUND

[0002] In recent years, the port machinery industry gradually transforms to electric power, and electric vehicles or electric trucks are introduced in freight distribution centers such as ports to replace traditional fuel transport trucks. With the transformation and upgrading of the freight industry, higher requirements are put forward for the comfort of the working environment of the drivers of large-scale vehicles.

[0003] On the one hand, it is hoped that the cab of the electric freight vehicle running or about to run can reach the suitable working temperature of the driver in the shortest possible time, which puts forward the requirement of fast adjustment for the temperature regulation equipment of the electric freight vehicle.

[0004] On the other hand, as the occurrence of extreme environmental temperature is increasing, it is hoped that the working temperature of the cab of the electric freight vehicle can be controlled in a wider range, in other words, it is hoped that the electric freight vehicle can be used in any natural environmental conditions or any latitude area, and the driver can work in comfortable temperature conditions.

[0005] While achieving the above two goals, for the electric freight vehicle, it is also hoped that the balance between the overall energy consumption and working performance of the electric freight vehicle can be considered at the same time.

[0006] Therefore, there is still a need to improve the thermal management of the existing electric freight vehicle, especially the temperature regulation of the cab. INVENTION CONTENTS

[0007] In order to meet the needs of fast and wide temperature regulation of the cab of the electric freight vehicle, improve the comfort of the driver of the electric freight vehicle and ensure the safety of driving, the utility model provides an electric freight vehicle with a temperature regulation equipment, the temperature regulation equipment includes a compressor, an evaporator and a condenser connected through a refrigerant pipeline, wherein the temperature regulation equipment further includes a PTC device, a heater core and a pump connected through a coolant pipeline, the compressor is a single compressor with a refrigerating capacity of more than 10KW, the evaporator includes a first evaporator and a second evaporator, wherein the first evaporator is directly connected with the compressor and the condenser, the second evaporator is connected to the compressor and the condenser through a solenoid valve, the solenoid valve is controlled to be switched, so that the refrigerant is controlled to pass through only the first evaporator or pass through both the first evaporator and the second evaporator at the same time, the first evaporator and the second evaporator are arranged in the cab of the electric freight vehicle for temperature regulation of the cab.

[0008] The temperature adjusting scheme according to the utility model realizes the refrigeration and heating mode of multiple working conditions and multiple modes, especially can meet the demand of rapid temperature drop and temperature rise of the cab of the electric freight vehicle. In addition, for the customer groups in different countries and regions, based on the local environmental conditions, the refrigerating capacity range can be independently controlled by opening and closing the second evaporator, so as to ensure the absolute comfort of the driver.

[0009] According to still another aspect of the utility model, the compressor is installed at the chassis behind the cab of the electric freight vehicle.

[0010] According to still another aspect of the utility model, the compressor and the condenser are further connected with the heat exchanger outside the cab, and the heat exchanger is connected to the compressor and the condenser in parallel with the first evaporator and the second evaporator.

[0011] The compressor installed at the chassis behind the cab can optionally expand the heat management for the electric freight vehicle, such as the heat management of the battery pack or the space outside the cab of the electric freight vehicle.

[0012] According to still another aspect of the utility model, when the electromagnetic valve opens the refrigerant pipeline to the second evaporator, the compressor operates at full power; when the electromagnetic valve closes the refrigerant pipeline to the second evaporator, the compressor operates at half power. In this way, on the one hand, the effect of temperature wide-range regulation is achieved, and on the other hand, the requirement of energy saving is met.

[0013] According to still another aspect of the utility model, the temperature adjusting device further comprises a first brushless fan and a second brushless fan for sending airflow. Using the brushless fan can reduce the noise of the cab as much as possible, which also improves the comfort of the driver.

[0014] According to still another aspect of the utility model, the first evaporator is arranged below the instrument desk in the cab of the electric freight vehicle, and the second evaporator is arranged below the driver's seat in the cab of the electric freight vehicle.

[0015] According to still another aspect of the utility model, the cab of the electric freight vehicle comprises a first air outlet part and a second air outlet part, the first air outlet part is arranged on the instrument desk, and the second air outlet part is arranged below the driver's seat.

[0016] The arrangement position of the above-mentioned evaporator and air outlet is beneficial to rapidly adjust the temperature of the area where the driver is located.

[0017] According to still another aspect of the utility model, a switch device for closing the electromagnetic valve connected with the second evaporator is arranged in the cab of the electric freight vehicle. By arranging the special switch device in the cab to switch the use or closing of the second evaporator, the driver can independently control and adjust the temperature of the cab according to the working environment.

[0018] According to a further aspect of the present application, the temperature regulating device further comprises a temperature sensor arranged to measure the temperature inside the cab, and when the measured temperature exceeds a preset value, the electromagnetic valve is opened, and when the measured temperature is lower than the preset value, the electromagnetic valve is closed.

[0019] According to a further aspect of the present application, the compressor is a variable frequency control compressor. The conventional variable frequency compressor is connected with only one evaporator, and the control of energy consumption and the wide-range adjustment of the high power of the compressor are still limited. In the present application, one variable frequency compressor is connected with double evaporators and double evaporators, so that the adjustment range is larger, and the response speed and the refrigerating capacity of the temperature regulating device are also improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] For a more complete understanding of the present application, reference is made to the following description of exemplary embodiments considered in connection with the accompanying drawings, in which:

[0021] Figure 1 A partial perspective view of an electric freight vehicle installed with a temperature regulating device according to a preferred embodiment of the present application is shown.

[0022] Figure 2 Another partial perspective view of an electric freight vehicle installed with a temperature regulating device according to a preferred embodiment of the present application is shown.

[0023] Figure 3 A partial perspective view of an instrument panel of an electric freight vehicle installed with a temperature regulating device according to a preferred embodiment of the present application is shown.

[0024] Figure 4 A principle block diagram of a temperature regulating device according to a preferred embodiment of the present application is shown.

[0025] LIST OF REFERENCE NUMERALS

[0026] 1 temperature regulating device

[0027] 11 compressor

[0028] 12 condenser

[0029] 13 first expansion valve

[0030] 14 first evaporator

[0031] 15 second expansion valve

[0032] 16 second evaporator

[0033] 18 electromagnetic valve

[0034] 19 refrigerant pipeline

[0035] 21 PTC device

[0036] 22 heater core

[0037] 23 water tanks

[0038] 24 pumps 24

[0039] 29 coolant line

[0040] 30 electric freight vehicles

[0041] 31 Cab

[0042] 32 instrument panel

[0043] 33 Driver's seat

[0044] 34 chassis DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with specific embodiments and accompanying drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0046] Figure 1 、 Figure 2 and Figure 3 They respectively show a partial three-dimensional schematic diagram of the cab of an electric freight vehicle 30 equipped with a temperature regulating device 1 according to a preferred embodiment of the present invention, and Figure 4 Shown Figure 1 、 Figure 2 and Figure 3 The same reference numerals in these drawings represent the same or similar type of devices or structures.

[0047] In a preferred embodiment, the temperature regulating device 1 mainly includes a refrigerant circulation unit connected by a refrigerant pipe 19 and a coolant circulation unit connected by a coolant pipe 29. Figure 4 As shown, the refrigerant circulation unit includes a compressor 11, a condenser 12, a first expansion valve 13, a first evaporator 14, a second expansion valve 15, a second evaporator 16, and a solenoid valve 18. Specifically, the condenser 12 is connected to the compressor 11, and the first expansion valve 13 and the first evaporator 14 are connected in series, while the first expansion valve 13 and the second evaporator 16 are connected in series. The two sets of expansion valves and evaporators are connected to the condenser 12 and the compressor 11 in parallel.

[0048] Specifically, on one hand, one end of the condenser is connected to the first expansion valve 13 through a section of refrigerant pipeline, and the first evaporator 14 connected with the first expansion valve 13 is connected to the compressor 11 through another section of refrigerant pipeline, and the first evaporator 14 is directly connected with the compressor 11 and the condenser 12 without additional control components, and the first evaporator is directly connected with the compressor and the condenser; in this way, the compressor 11, the condenser 12, the first expansion valve 13 and the first evaporator 14 are connected in series to form a first refrigerant circuit, on the other hand, one end of the condenser 12 is connected to the second expansion valve 15 through a refrigerant pipeline passing through an electromagnetic valve 18, and the second evaporator 16 connected with the second expansion valve 15 is also connected to the compressor 11 through a section of refrigerant pipeline, in this way, the compressor 11, the condenser, the electromagnetic valve 18, the second expansion valve 15 and the second evaporator 16 are connected in series to form a second refrigerant circuit. In the above refrigerant circulation unit connected by the refrigerant pipeline, the electromagnetic valve 18 is controlled to be switched, so that the refrigerant is controlled to pass through only the first evaporator 14 or pass through both the first evaporator 14 and the second evaporator 16 at the same time.

[0049] In the preferred embodiment according to the utility model, in order to meet the rapid and efficient refrigeration of different climate use environments, the compressor 11 is a single compressor 11 with a refrigeration capacity of more than 10 KW, and the performance of the condenser is preferably at least 18 KW. The first evaporator 14 and the second evaporator 16 are adapted to the compressor 11, and generally, the first evaporator 14 and the second evaporator 16 have the same specifications, that is, they can have the same heat exchange capacity. In an alternative embodiment, the heat exchange capacity of the first evaporator 14 is greater than that of the second evaporator 16.

[0050] The compressor 11 suitable for the temperature regulating device is a variable frequency compressor, which includes a variable frequency control part to perform variable frequency control on the motor of the compressor 11, so as to realize wide-range adjustment of the refrigeration capacity of the compressor. Preferably, when the electromagnetic valve 18 is opened to open the refrigerant pipeline leading to the second evaporator 16, the variable frequency control part controls the compressor 11 to operate at full power; when the electromagnetic valve 18 is closed to close the refrigerant pipeline leading to the second evaporator 16, the variable frequency control part controls the compressor 11 to operate at half power.

[0051] Further as Figure 4 shown, in order to meet the rapid and efficient heating demand of different climate use environments, the temperature regulating device 1 according to the utility model further includes a coolant circulation unit connected by a coolant pipeline. The coolant circulation unit includes a PTC device 21, a pump 24 and a warm air core 22, which are connected into a loop by a coolant pipeline, and a liquid storage chamber such as a water tank 23 is arranged between the warm air core 22 and the pump 24. The coolant is usually water, and the pump 24 pumps the water circulating in the coolant pipeline into the PTC device 21, the heat of the water is transferred to the air through the warm air core 22 and is sent out to improve the temperature in the cab 31 of the electric truck 30.

[0052] In the utility model, Figure 4 The temperature regulating device 1 shown in the figure is particularly suitable for regulating the temperature of the cab 31 of the electric freight vehicle 30, Figures 1-3 The temperature regulating device 1 shown in the figure is particularly suitable for regulating the temperature of the cab 31 of the electric freight vehicle 30, Figures 1-3 The preferred arrangement of the main components in the electric freight vehicle 30 is shown.

[0053] As shown in Figure 1 And Figure 2 The first evaporator 14 and the second evaporator 16 are both arranged inside the cab 31, i.e. inside the space of the cab 31. Specifically, the first evaporator 14 is arranged below the instrument panel 32, and the second evaporator 16 is arranged below the driver's seat 33. Each evaporator is fitted with a fan for delivering air flow to the first air outlet portion and the second air outlet portion, wherein the first air outlet portion preferably faces the direction of the driver's seat 33, and the second air outlet portion preferably faces the front of the vehicle. The first air outlet portion can be provided on the main body of the instrument panel 32 and can include multiple openings.

[0054] In addition, in order to further improve the comfort of the cab 31, the two fans of the first and second evaporators 14, 16 are both brushless fans.

[0055] The compressor 11 is arranged in the chassis 34 behind the cab 31 at a distance therefrom, preferably below the battery pack of the electric freight vehicle 30, and the condenser 12 is arranged at the chassis 34 below the cab 31.

[0056] On the other hand, the heater core 22 is arranged inside the cab 31, preferably also below the instrument panel 32.

[0057] Further, the temperature regulating device 1 can be provided with a dedicated switching device to control the opening and closing of the electromagnetic valve 18 of the second evaporator 16. The switching device can be provided on the instrument panel 32 of the cab 31, so that the driver can directly switch the working mode of the temperature regulating device 1 through the switching device.

[0058] In other embodiments, the temperature regulating device 1 further comprises a temperature sensor arranged to measure the temperature inside the cab 31, and when the measured temperature exceeds a preset value, the electromagnetic valve 18 is opened, and when the measured temperature is lower than the preset value, the electromagnetic valve 18 is closed, thereby controlling the working mode of the temperature regulating device 1 through a preset program.

[0059] The temperature regulating device 1 according to the utility model can be controlled to operate in multiple working conditions and multiple modes.

[0060] In the high-cooling mode of the temperature control device 1, typically used when the ambient temperature is extremely high or when the temperature of the cab 31 needs to be lowered quickly, the solenoid valve 18 opens and the compressor 11 pressurizes the refrigerant at full power. For example, in a preferred embodiment, the compressor 11 operates at full power, with a cooling capacity of 10 kW. The condenser 12 liquefies the refrigerant, releasing heat. The low-temperature refrigerant simultaneously flows through the first expansion valve 13, the first evaporator 14, the second expansion valve 15, and the second evaporator 16. The first and second evaporators 14, 16 operate to lower the air temperature, and the cooling airflow is simultaneously delivered through two air outlets located below the instrument panel 32 and the driver's seat 33. The simultaneous operation of the two evaporators 14 and 16 will extremely quickly lower the temperature of the cab 31. At the same time, the pump 24 and the PTC device 21 are in the off state.

[0061] In the low cooling mode or energy-saving cooling mode of the temperature control device 1, typically used when the ambient temperature is not particularly high or when the cab 31 has already been in the high cooling mode and has a relatively low ambient temperature, the solenoid valve 18 connected to the second evaporator 16 is automatically or manually closed, and the compressor 11 pressurizes the refrigerant at half power. For example, in a preferred embodiment, the compressor 11 operates at a cooling capacity of 5 kW. The low-temperature refrigerant, which has liquefied and released heat through the condenser 12, flows only through the first expansion valve 13 and the first evaporator 14. The cooling airflow is delivered only to the cab 31 through the first air outlet located on the instrument panel 32. Simultaneously, the pump 24 and the PTC device 21 are in the off state.

[0062] The switching between the high cooling mode and the low cooling mode of the temperature regulating device 1 can be directly manually controlled by a dedicated switch device provided on the instrument panel 32, or can also be achieved through program control with the help of the temperature measured by the temperature sensor.

[0063] In the high-heating mode of temperature control device 1, typically used when the ambient temperature is extremely low or when the temperature of cab 31 needs to be quickly raised, solenoid valve 18 opens, allowing the refrigerant, compressed at high pressure by compressor 11, to enter first evaporator 14 and second evaporator 16. The refrigerant liquefies and releases heat, heating the air in evaporators 14 and 16. The brushless fan then delivers the heated air through two air outlets into cab 31. Simultaneously, pump 24 and PTC device 21 are turned on, circulating water flows through the coolant line. The circulating water, heated by PTC device 21, rises in temperature and enters heater core 22, exchanging heat with the air.

[0064] The temperature regulating device 1 also includes a low heating mode, which is usually used when the ambient temperature is not so low or after the high heating mode has been running for a period of time. In this mode, only one of the compressor heating and PTC heating cycle circuits of the temperature regulating device 1 enters the working state.

[0065] In an alternative embodiment, the temperature regulation device 1 can also comprise a heat exchanger installed outside the cab 31. Specifically, one end of the compressor 11 installed in the chassis 34 behind the cab 31 is additionally connected to one end of the heat exchanger, and the other end of the heat exchanger is connected to the condenser in the chassis 34 through an additional electromagnetic valve, that is, the heat exchanger is connected to the compressor 11 and the condenser in a parallel relationship with the first evaporator 14 and the second evaporator 16. The heat exchanger is installed outside the cab 31, and by controlling the additional electromagnetic valve, the heat exchanger can be used to controllably cool the battery pack or other space of the electric freight vehicle.

[0066] With the temperature regulation scheme according to the present application, multiple working conditions and multiple modes of refrigeration and heating modes are realized, and in particular, the demand for rapid cooling and heating of the cab 31 of the electric freight vehicle 30 can be met.

[0067] In addition, for customers in different countries and regions, based on the local environmental conditions, the refrigeration capacity range can be autonomously controlled by opening and closing the second evaporator 16, ensuring the absolute comfort of the driver.

[0068] By controlling two evaporators 14, 16 through one electromagnetic valve 18 via one variable frequency compressor 11, the components of the temperature regulation device 1 are simplified, and the weight of the whole vehicle is also reduced.

[0069] The compressor 11 installed in the chassis 34 behind the cab 31 can be extended to connect the heat exchanger, thereby cooling the battery pack of the electric freight vehicle 30, and advantageously improving the efficiency and flexibility of the battery pack cooling.

[0070] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not deviate from the technical scheme of the present application, falls within the protection scope defined by the claims of the present application.

Claims

1. An electric freight vehicle having a temperature regulating device, wherein the temperature regulating device comprises a compressor (11), an evaporator (14, 16) and a condenser (12) connected by a refrigerant pipeline, It is characterized by: The temperature regulating device further comprises a PTC device (21), a heater core (22) and a pump connected via a coolant pipeline. The compressor (11) is a compressor with a single refrigeration capacity of more than 10KW, The evaporator comprises a first evaporator (14) and a second evaporator (16), wherein the first evaporator (14) is directly connected to the compressor (11) and the condenser (12), and the second evaporator (16) is connected to the compressor (11) and the condenser (12) via a solenoid valve (18), and the solenoid valve (18) is switched in a controlled manner so that the refrigerant is controlled to pass only through the first evaporator (14) or pass through both the first evaporator (14) and the second evaporator (16). The first evaporator (14) and the second evaporator (16) are both arranged in a cab of an electric freight vehicle and are used to adjust the temperature of the cab (31) of the electric freight vehicle.

2. The electric freight vehicle according to claim 1, wherein: The compressor (11) is mounted on a chassis (34) behind a cab of the electric freight vehicle.

3. The electric freight vehicle according to claim 1, wherein: When the solenoid valve (18) is opened to connect the refrigerant pipeline to the second evaporator (16), the compressor (11) operates at full power; when the solenoid valve (18) is closed to shut off the refrigerant pipeline to the second evaporator (16), the compressor (11) operates at half power.

4. The electric freight vehicle according to claim 1, wherein: The temperature regulating device further comprises a first brushless fan and a second brushless fan, wherein the first brushless fan and the second brushless fan are arranged to respectively send out airflow passing through the first evaporator (14) and the second evaporator (16).

5. The electric freight vehicle according to claim 1, wherein: The first evaporator (14) is arranged below the instrument panel in the cab of the electric freight vehicle, and the second evaporator (16) is arranged below the driver's seat (33) in the cab of the electric freight vehicle.

6. The electric freight vehicle according to claim 5, characterized in that: The cab of the electric freight vehicle comprises a first air outlet and a second air outlet, wherein the first air outlet is arranged on the instrument panel (32) and the second air outlet is arranged below the driver's seat (33).

7. The electric freight vehicle according to claim 1, wherein: A switch device for switching the solenoid valve (18) is provided in the cab (31) of the electric freight vehicle.

8. The electric freight vehicle according to claim 1, wherein: The temperature regulating device further comprises a temperature sensor, which is arranged to measure the temperature in the cab. When the measured temperature exceeds a preset value, the solenoid valve (18) opens, and when the measured temperature is lower than the preset value, the solenoid valve (18) closes.

9. The electric freight vehicle according to claim 1, wherein: The compressor is a variable frequency controlled compressor.

10. The electric freight vehicle according to claim 1, wherein: The compressor (11) and the condenser (12) are further connected to a heat exchanger located outside the cab, and the heat exchanger is connected to the compressor and the condenser in parallel with the first evaporator and the second evaporator.

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