CN204230973U - A kind of air cooling system of electric automobile battery charger - Google Patents

Abstract

The utility model provides an air-cooling system for an electric vehicle charger; comprising a cabinet (1) with an air inlet (6) on the lower back panel and an air outlet (7) on the upper front panel; the air inlet ( 6) The front end is provided with an air inlet fan and a cooling coil (15) whose pipeline is vertically arranged at one end of the air inlet of the S-shaped air duct (23); the air outlet (24) of the S-shaped air duct (23) ) pointing to the upper front of the cabinet (1); the rear end of the air outlet (7) is provided with an exhaust fan and a charging module (8) in sequence; and a control device (9) is provided above the charging module (8). For high-power indoor chargers, the utility model avoids the poor cooling effect caused by the accumulation of heat in the charging room; for outdoor chargers, it solves the contradiction between the protection of the cabinet shell and the heat dissipation of power devices, so that the high-power chargers can also become The outdoor charger is installed, put into operation and used outdoors.

Description

An air cooling system for an electric vehicle charger

Technical field:

The utility model relates to an air-cooling system, in particular to an air-cooling system which uses chilled water to precool the air intake of an electric vehicle charger.

Background technique:

The electric vehicle charger adopts a modular configuration, and multiple charging modules of the same model in the cabinet operate in parallel, output the same voltage, and share the load current together. With the improvement of circuit topology and the application of magnetic integration technology, the switching frequency and power density of the charging module continue to increase, and the volume of the housing is significantly reduced. However, the fan speed increases accordingly, and ventilation and heat dissipation become particularly important. For power electronic equipment, the general operating temperature is reduced by half for every 10°C increase in operating temperature.

The electric vehicle charger is air-cooled. The air inlet of the cabinet is equipped with a fan. The cold air enters from the air inlet on the front panel of the cabinet, passes through the internal air duct of the charging module, and is discharged from the air outlet on the back panel of the cabinet. The cooling effect depends on the air flow generated by the fan rotation, the effective air intake area of the air inlet, the effective air outlet area of the air outlet, and the smooth convection of cold and hot air outside the cabinet.

In order to prevent the dust outside the cabinet from entering the interior of the electric vehicle outdoor charger, a dust-proof filter is installed at the vent of the cabinet. The dust-proof filter not only blocks suspended particles, but also greatly reduces the airflow velocity in the air duct; Effect, usually also reduce the effective area of the air inlet and outlet. Due to the inability to solve the contradiction between the protection of the cabinet shell and the heat dissipation of power devices, outdoor chargers are only used as small chargers to charge passenger cars with small on-board batteries, and are gradually replaced by high-power indoor chargers.

In addition, the electric vehicle charger should be able to withstand the alternating damp heat test specified in GB/T 2423.4-2008. The test uses the "breathing" effect as the main moisture mechanism to verify the endurance of the equipment in a humid environment. The formation mechanism and hazards of the "breathing" effect are as follows:

The start and stop of power electronic equipment or the change of load will cause the internal devices to expand with heat and contract with cold, and the air pressure in the cavity of the device will change accordingly. The gas inside and outside the cavity will exchange through the gaps on the surface of the device. Contaminants will pass through the gap and be sucked into the device. Water vapor will accumulate in the cavity and eventually condense into water droplets and deposit inside the device. The chemical substances in the condensed water corrode the internal structure of the device, and the salt in the condensed water reduces the internal insulation performance of the device, resulting in accelerated failure of the device.

The existing process is to spray three anti-corrosion coatings inside the electric vehicle charging module. After curing, a transparent hard protective film will be formed on the surface of the device, which can prevent moisture, mildew and salt spray. Stress will cause the hard coating to crack along with the surface of the device, thereby losing its protective effect.

Utility model content:

In order to overcome the above-mentioned shortcomings in the prior art, the utility model provides an air cooling system for an electric vehicle charger.

The technical solution adopted by the utility model is: an air cooling system for an electric vehicle charger, comprising a cabinet (1) with an air inlet (6) left on the lower back panel and an air outlet (7) left on the upper front panel; Its improvement is that: the front end of the air inlet (6) is sequentially provided with an air inlet fan and a refrigeration coil (15) whose pipe is vertically arranged at one end of the air inlet of the S-shaped air duct (23); The air outlet (24) of the air duct (23) points to the front and upper part of the cabinet (1); the rear end of the air outlet (7) is sequentially provided with an exhaust fan and a charging module (8); the charging module ( 8) A control device (9) is arranged above.

Preferably, the air inlet (6) of the cabinet (1) is provided on the backboard of the cabinet (1), and the air outlet is the air outlet (24) of the S-shaped air duct (23). The closed box (2); the air intake fan, the S-shaped air duct (23), and the refrigeration coil (15) are arranged in the closed box (2); the refrigeration coil ( 15) The effective air passage area is equal to the effective air intake area of the air inlet (6), and equal to the effective air outlet area of the air outlet (24) of the S-shaped air duct (23).

Further, the air inlet (6) of the cabinet (1) is equipped with a steel wire protective net or a protective louver (21), and the air outlet (7) of the cabinet (1) and the S-shaped air duct (23) A steel wire protective net is installed on the air outlet (24).

Further, the air inlet end of the refrigerating coil (15) is connected with a water supply pipe (16), the air outlet end is connected with a water return pipe (17), and a water collection tray (18) is arranged at the bottom thereof, and the water collection tray (18) The bottom end is provided with a check valve (19) and a drainpipe (20);

The water supply pipe (16) and the return water pipe (17) pass through the lower pipe wall of the S-shaped air duct (23), the bottom plate of the closed box (2) and the bottom plate of the cabinet (1) in sequence. , connected with the chilled water circulation subsystem of the cooling system in the station;

After the drainage pipe (20) passes through the bottom plate of the closed box (2) and the bottom plate of the cabinet (1) in sequence, the condensed water in the water collection tray (18) is discharged into the drainage system in the station.

Further, the cooling system is composed of a chilled water circulation subsystem and a cooling water circulation subsystem connected to the refrigeration host (31);

The refrigeration host (31) is provided with a chilled water inlet, a chilled water outlet, a cooling water inlet, and a cooling water outlet;

The chilled water circulation subsystem includes a chilled water pump (34), a water separator (35) and a water collector (36); the chilled water outlet of the refrigeration main engine (31), the chilled water pump (34), the The water distributor (35), the water supply pipe (16), the refrigeration coil (15), the water return pipe (17), the water collector (36), and the cooling of the refrigeration host (31) The water inlets are connected in turn to form a closed water circulation loop;

The cooling water circulation subsystem includes an outdoor cooling tower (32), a cooling water pump (33); the cooling water outlet of the refrigeration host (31), the outdoor cooling tower (32), the cooling water pump (33), The cooling water inlets of the refrigeration host (31) are connected in sequence to form a closed water circulation loop.

Further, the water supply pipe (16) and the return water pipe (17) in the closed box (2) are provided with a flow control valve (37) for controlling the flow of chilled water in the refrigeration coil (15) flow.

Preferably, the charging module (8) includes a chassis mounted horizontally on the front panel of the cabinet (1), and transformers, reactors, digital signal processors and power electronic power devices installed in the chassis; The transformer and the reactor are arranged on both sides of the air duct in the chassis; the digital signal processor and the power electronic power device are arranged in the center of the air duct in the chassis, and the power electronic power device is close to the The tail of the chassis; a steel wire protective net is installed at the tail of the chassis;

A heat sink is arranged on the power electronic power device; thermal conductive silica gel is poured between the heat sink and the power electronic power device.

Further, a bypass pipe (38) with both ends communicating with the return water pipe (17) and the water supply pipe (16) is provided between the refrigeration coil (15) and the flow control valve (37); The through pipe (38) is provided with two electric check valves (39), and a circulating water pump (40) and an electric drain valve (41) between the two electric check valves (39). The through pipe (38) communicates with the drain pipe (20) through the electric drain valve (41).

Further, a dust-proof filter (10) is installed on the inside of the steel wire protective net of the air inlet (6), and a dust-proof isolation net (11) is installed on the inner side of the steel wire protective net of the air outlet (7), and the air inlet (6) is provided with a temperature sensor for measuring the air temperature outside the cabinet.

Further, a detachable button cover is installed on the outside of the protective shutter (21) of the air inlet (6), and an electrostatic air filter (22) is installed between the protective shutter (21) and the air intake fan; The bottom of the electrostatic air filter (22) is provided with an ash hopper (25) whose ash outlet (26) is inlaid on the bottom plate of the closed box (2).

Further, a partition (4) perpendicular to the backboard of the cabinet (1) is provided between the closed box (2) and the charging module (8), and the S-shaped air duct (23) is embedded in the A partition (4), the joint between the partition (4) and the cabinet (1) is pressed with a felt sealing strip, and the partition (4) is provided with a tapered Isolation grommet (14).

Compared with the closest prior art, the present application has the following beneficial effects:

(1) A cooling coil is installed at the air inlet of the cabinet to reduce the inlet air temperature. For high-power indoor chargers, it avoids the poor cooling effect caused by the accumulation of heat in the charging room; for outdoor chargers, it solves the problem. The contradiction between the protection of the cabinet shell and the heat dissipation of the power device enables the high-power charger to be installed outdoors;

(2) The lower part of the refrigeration coil has a catchment tray for receiving condensed water, which discharges the condensed water and chemical pollutants in the condensed water generated during the dehumidification process into the drainage system in the electric vehicle charging station;

(3) There is a check valve at the lower end of the water collecting tray, which prevents the moisture in the drainage pipeline from entering the cabinet;

(4) Use the chilled water generated by the central air-conditioning system in the electric vehicle charging station as the cold source of the refrigeration coil, and there is no need to purchase special refrigeration equipment;

(5) Protective louvers are installed at the air inlet of the closed box, and its protection level meets IP44. There is an electrostatic air filter at the rear of the louvers. The louvers can prevent fingers, hand-held slender objects, and water spraying, spraying or splashing outside the cabinet. Water touches the high-voltage live parts in the electrostatic air filter behind the window;

(6) An electrostatic air filter is installed in the closed box, which can prevent suspended particles of PM10 and PM2.5 levels from entering the cabinet, and avoid charger failure caused by fine particle pollutants;

(7) The refrigeration coil in the closed box is located at the rear of the electrostatic air filter to prevent suspended particles in the air from mixing with condensed water and adhering to the refrigeration coil;

(8) The partition is provided with a tapered isolation hole sleeve for cables to pass through, which can effectively prevent the dust in the lower layer of the cabinet from entering the upper layer of the cabinet through the cable threading hole.

Description of drawings:

Accompanying drawing 1: the air-cooling system of embodiment 1 and the schematic diagram of cabinet structure;

Accompanying drawing 2: the schematic diagram of the cooling system of embodiment 1;

Accompanying drawing 3: the program flowchart of embodiment 1 control method;

Accompanying drawing 4: the program flowchart of the cooling subroutine in the constant current charging stage of embodiment 1;

Accompanying drawing 5: the program flowchart of the cooling subroutine in the constant voltage charging stage of embodiment 1;

Accompanying drawing 6: the air-cooling system of embodiment 2 and the schematic diagram of cabinet structure;

Accompanying drawing 7: the schematic diagram of the cooling system of embodiment 2;

Accompanying drawing 8: the program flowchart of embodiment 2 control method;

Accompanying drawing 9: the program flowchart of the dehumidification subroutine in the constant voltage charging stage of embodiment 2;

Accompanying drawing 10: the program flowchart of the subroutine that prevents refrigeration coil from freezing of embodiment 2;

Accompanying drawing 11: The cabinet structure and device arrangement diagram of embodiment 3;

Accompanying drawing 12: Schematic diagram of the structure and device layout of the dust removal and dehumidification device in embodiment 3;

Accompanying drawing 13: the program flowchart of embodiment 3 control method;

Accompanying drawing 14: the program flow chart of the dehumidification subroutine in the constant current charging stage of embodiment 3;

Accompanying drawing 15: the program flowchart of the dehumidification subroutine in the constant voltage charging stage of embodiment 3.

Among them: 1-cabinet; 2-box; 4-partition; 5-cable trench; 6-air inlet; 7-air outlet; 8-charging module; 9-control device; 10-dust filter; 11- Dust-proof isolation net; 12-terminal block; 13-cable; 14-isolation hole sleeve; 15-refrigeration coil; 16-water supply pipe; 17-return pipe; 18-water collecting tray; 19-return valve; 20-drainage pipe; 21-protective shutters; 22-electrostatic air filter; 23-S-shaped air duct; 24-air outlet of the box; 25-ash bucket; 26-ash outlet; 28-felt sealing ring; 31 -refrigeration main unit; 32-outdoor cooling tower; 33-cooling water pump; 34-chilled water pump; 35-water separator; 36-water collector; 37-flow control valve; 38-bypass pipe; ; 40-circulating water pump; 41-electric drain valve.

Detailed ways:

In order to better understand the utility model, the content of the utility model is further described below in conjunction with the accompanying drawings of the description:

The air cooling system of the 1st embodiment that the utility model provides is as shown in Figure 1:

The first embodiment provided by the utility model is used for a high-power indoor charger in an electric vehicle charging station. The space in the charging room is limited, and hot air gathers, which is not conducive to convective heat dissipation. In this embodiment, an air inlet precooling device is installed at the air inlet of the cabinet to improve the cooling effect of air cooling by reducing the temperature of the inlet air; , leading to a decrease in relative humidity, so this embodiment only enhances the cooling effect of air cooling, and does not involve the protection of the "breathing" effect.

The air cooling system is located in a closed cabinet where the frame and the cladding are tightly spliced. The air inlet 6 is provided under the back panel of the cabinet 1, and the air outlet 7 is provided on the front panel of the charging module 8 embedded in the front panel of the cabinet; the cold air outside the cabinet Enter the cabinet from the air inlet 6, pass through the air inlet precooling device and the airflow channel at the rear of the cabinet, pass through the air duct in the charging module 8, and be discharged from the cabinet by the air outlet 7 on the front panel of the charging module 8; subject to the cabinet In terms of airflow organization and device layout, the air intake mode of the utility model is that the rear panel enters the air and the front panel exits the air, which is different from the traditional method. The air cooling system includes an air inlet precooling device, a charging module 8 and an internal air duct, a control device 9, and an airflow layout in the cabinet.

Air intake precooling device

The air inlet precooling device is located in the box body 2 below the cabinet 1. The box body panels of the box body are made of iron and are spliced tightly with each other to make it a closed box body; the air inlet 6 of the box body 2 is embedded in the cabinet 1 The backplane, the air inlet 6 of the cabinet 2 is the air inlet 6 of the cabinet 1, and the air outlet 24 of the cabinet 2 is located inside the cabinet 1 as the starting point of the airflow channel. The air inlet precooling device is composed of two parts: air system and water system.

wind system

The air system of the air inlet precooling device is wrapped in the air duct in the box body 2, and along the airflow direction of the air duct, there are air inlet 6, air inlet fan, cooling coil 15, S-shaped air duct 23 and the outlet of the box body. Tuyere 24. In order to prevent people from touching the air intake fan, the air inlet 6 is equipped with a steel wire protective net. In order to prevent foreign objects from falling into the S-shaped air duct 23, the air outlet 24 of the box is also equipped with a steel wire protective net, but the steel wire protective net reduces the air intake. The effective air inlet area of the tuyere 6, and the effective air outlet area of the air outlet 24.

The cooling coil 15 in the air system is used to pre-cool the incoming air and enhance the cooling effect of the air cooling, but the chilled water pipes in the cooling coil 15 and the fins on the pipes hinder the air flow, reducing the cooling capacity of the cooling coil 15. effective wind area. In order to keep the air flow in and out of the air duct equal, and the inside of the air duct is free of wind, the effective air passage area of the cooling coil 15 is equal to the effective air intake area of the air inlet 6, and equal to the effective air outlet area of the air outlet 24, so the air duct After passing through the air inlet fan, the cross-section of the air pipe expands, and the cross-sectional size of the air pipe at the cooling coil 15 is equal to the cross-sectional size of the cooling coil 15, and the cross-section of the air pipe shrinks after passing through the cooling coil 15.

The S-shaped air duct 23 at the end of the air duct of the air system is used to send the outlet air of the air inlet precooling device into the air passage at the rear of the cabinet. After the air outside the cabinet enters the closed box 2 carrying the air intake precooling device from the air inlet 6, it turns to the upper rear side of the closed box 2 by means of the S-shaped air duct 24, and reaches the air flow channel at the rear of the cabinet; S The air outlet 25 of the shaped air duct 24 points obliquely upward, and directs the air outlet of the air inlet precooling device to the charging module 8 and the control device 9 .

In order to improve the cooling effect, the refrigeration coil 15 is made of heat-conducting continuous carbon fiber reinforced polymer matrix composite material CFRP, in which the heat-conducting reinforcing material is continuous vapor-phase grown carbon fiber VGCF, whose thermal conductivity can reach 5 times that of copper, and has certain mechanical properties. Performance, the matrix material adopts polypropylene PP with excellent mechanical properties, and the particle filler adopts graphene nanosheets GNPs with excellent thermal conductivity, whose thermal conductivity can reach 13 times that of copper, so as to improve the radial thermal conductivity of the refrigeration coil 15; In order to greatly improve the thermal conductivity of the composite material without significantly reducing the mechanical properties of the composite material, the mass content of the matrix material in the composite material is 65%, the mass content of the thermal conductivity enhancing material is 15%, and the mass content of the particle filler is 20%; In order to further improve the radial thermal conductivity of the cooling coil 15 , the continuous carbon fibers are arranged in parallel in the axial direction, and are braided in the radial direction using a "needled integral felt" structure.

water system

The water system of the air inlet pre-cooling device is used to supply chilled water to the cooling coil 15, and the condensed water generated by the external cooling coil 15 is installed under the air duct of the air inlet pre-cooling device, including the cooling coil 15 The water supply pipe 16, the return pipe 17, the catch pan 18 and the drain pipe 20, and the flow control valve 37 of the water supply pipe 16 and the return pipe 17.

The water supply pipe 16 and the water return pipe 17 of the refrigeration coil 15 penetrate from the bottom of the air pipe, the water supply pipe 16 is connected to the air inlet end of the refrigeration coil 15, and the return water pipe 17 is connected to the air outlet end of the refrigeration coil 15; The water supply and return water temperature of the pipe 15 is lower than the air temperature in the cabinet, and the heat insulation sleeve is wrapped around the water supply pipe 16 and the return water pipe 17; A felt sealing strip is pressed at the joint between the pipe and the air pipe; in the closed box 2, there are flow control valves 37 for the water supply pipe 16 and the return pipe 17 on the lower side of the air pipe, and the flow control valve 37 is used to adjust the refrigeration coil. The chilled water flow within 15, and automatically maintain the flow stability.

Below the refrigeration coil 15 there is a water collecting pan 18 for receiving condensed water. The water collecting pan 18 is in the shape of an inverted square cone. The opening on the side pipe wall is located below the refrigeration coil 15 and is close to the refrigeration coil 15. The size of the opening is the same as the size of the bottom frame of the refrigeration coil 15; when the temperature and relative humidity of the air outside the cabinet are high, When the air flow passes through the cooling coil 15, the water vapor in the air will condense on the fins of the cooling coil 15, and after the water vapor condenses, it will drip into the water collecting pan 18 and collect in the pan; the conical bottom of the water collecting pan 18 is connected to There is a check valve 19 and a drain pipe 20. The check valve 19 is used to prevent the moisture in the drain pipeline from entering the air precooling device. The drain pipe 20 is used to discharge the condensed water out of the cabinet and inject it into the drain in the electric vehicle charging station. System; the water supply pipe 16, the water return pipe 17 and the drain pipe 20 pass through the bottom of the box body 2, and descend into the cable trench 5 below the cabinet body.

Airflow layout in the cabinet

The front panel of the cabinet is provided with an opening with the same cross-sectional size as the charging module 8 and the control device 9; during installation, the charging module 8 and the control device 9 are inserted into the cabinet from the opening on the front panel of the cabinet; the charging module 8 is placed on the frame After tightening the screws and the screws on the fixing clips on the rear side of the frame of the control device 9, the front panels of the charging module 8 and the control device 9 are inlaid and fixed on the front panel of the cabinet, and the chassis of the charging module 8 and the control device 9 are located in the cabinet .

The air outlet 7 of the charging module 8 is located on the front panel of the charging module 8, and the air inlet is located at the tail of the chassis. After the charging module 8 is embedded on the front panel of the cabinet, the air outlet 7 of the charging module 8 is the air outlet 7 of the cabinet. The air inlet of the charging module 8 is located inside the cabinet as the end of the airflow channel; the control device 9 adopts a self-cooling method, and ventilation holes are distributed on the cabinet.

There is no device installed in the rear space of the cabinet above the air inlet precooling device, forming an airflow channel in the cabinet; after the outlet air of the air inlet precooling device enters the airflow channel, it blows to the charging module 8 and the control device 9, and reaches the charging module 8 The cold wind is inhaled by the charging module 8 from the rear, and the cold wind arriving at the control device 9 is also inhaled by the charging module 8 from the rear after being convected in the upper space in the cabinet.

The cold air that enters the charging module 8 from the rear passes through the internal air duct of the charging module 8, passes through the air outlet fan at the front of the charging module 8, and is discharged out of the cabinet through the air outlet 7 on the front panel of the charging module 8; The fan is used to maintain the air flow in the air duct, enhance the cooling effect of the radiator and heat-generating devices in the air duct, and draw the convective air flowing through the upper space of the cabinet out of the cabinet.

In order to prevent people from touching the air outlet fan in the charging module 8, the air outlet 7 is equipped with a steel wire protective net. In order to prevent people from touching the live parts in the charging module 8, the air inlet at the rear is also equipped with a steel wire protective net; The charging modules 8 all have identical air outlets, and the effective air outlet area of the cabinet air outlet 7 is equal to the effective air outlet area of each charging module 8 multiplied by the number of charging modules 8; The rated power is related to the rated power, but the number of air inlet precooling devices has nothing to do with the rated power. For each model with different rated power, the effective air inlet area of the cabinet air inlet 6 cannot always be equal to the effective air outlet area of the cabinet air outlet 7. ; Adjust the speed ratio of the speed of the air inlet fan in the air inlet precooling device to the speed of the air outlet fan in the charging module 8, so that the air inlet flow of the cabinet is equal to the air outlet flow of the cabinet, and there is no wind inside the cabinet.

Charging module charging and internal air duct

The heating devices in the charging module 8 include magnetic components such as transformers and reactors, digital signal processor DSP chips and power electronic power devices. Transformers and reactors have small losses, large volumes, and sufficient contact area with the air, so they can be directly placed on both sides of the air duct; DSP chips are designed with low power consumption, and can be directly placed in the air duct without a radiator; The power electronic power device is the main heat source in the charging module 8 and must be equipped with a radiator, which is arranged in the center of the air duct close to the air inlet.

The shape of the heat sink of the power device in the charging module 8 is similar to that of a traditional metal profile heat sink, but CFRP composite material is used. The air gap between the devices is filled with a very thin thermal silica gel between the heat sink and the power devices.

The CFRP composite material has high thermal conductivity, which can conduct more heat from the base to the top of the fin; the thermal conductivity enhancement material in the CFRP composite material still uses continuous VGCF carbon fiber, and the matrix material is changed to high-density polyethylene with better dielectric properties HDPE, the particle filler still uses GNPs; because the mechanical properties of the radiator can be appropriately reduced, the mass content of the matrix material in the composite material is reduced to 45%, the mass content of the thermal conductivity enhancing material is increased to 25%, and the mass content of the particle filler is increased to 30%. %; The continuous VGCF carbon fiber adopts the "shaft rod method" at the base and the root of the fin, and is braided in a three-dimensional and four-way structure. While forming a heat conduction channel, it partially compensates for the decrease in mechanical properties caused by the decrease in the content of the matrix material in the composite material; continuous After the VGCF carbon fiber is interlaced in the base, it extends to the top of the ribs, so that the heat at the bottom of the base can be continuously transmitted along the carbon fibers to the top of the ribs; the main part of the ribs is restored to "needle punched integral felt" The weaving structure facilitates the conduction of heat inside the fins to the surface of the fins along the vertical direction of the fins.

The radiator in the charging module 8 mainly adopts the solid-fluid mutual contact conduction method to dissipate heat, and the heat dissipation area of the radiator should be maximized in the limited space inside the chassis; the height of the fins of the radiator is close to the top of the chassis of the charging module 8 , the distance between the top of the rib and the top plate of the chassis is equal to the spacing between the ribs.

The radiator in the charging module 8 also dissipates heat by radiation. The surface of the radiator is coated with low-temperature infrared radiation coating, which can dissipate the heat of the radiator to the surrounding air in the form of infrared radiation; the infrared radiation coating is an organic nanocomposite coating, in which the radiation filler is silica and alumina nanoparticles, and the mass is The contents are respectively 1.8% and 2.2%, and the coating base material is acrylic emulsion, and the mass content is 96%.

The thermally conductive silica gel between the radiator and the power device is nano-composite thermally conductive silica gel, wherein the thermally conductive filler is GNPs, with a mass content of 15%, and the silica gel base material is conventional room temperature vulcanized silicone rubber RTV, which contains a small amount of ethanol vulcanization retarder, with a mass content of 85%.

control device

The heating device in the control device 9 is an embedded microprocessor chip, and the microprocessor chip adopts a low power consumption design, and is directly arranged on a circuit board in the control device 9 without adding a radiator.

The cooling system attached to the air-cooling system in the first embodiment is shown in Figure 2:

The water supply pipe 16 and the water return pipe 17 of the refrigeration coil 15 in FIG. 1 are connected to the chilled water circulation subsystem of the cooling system in FIG. 2 .

The cooling system includes two water circulation subsystems of chilled water and cooling water. The chilled water circulation subsystem is used to provide cooling for the terminal access equipment of the cooling system, and the cooling water circulation subsystem is used to dissipate heat and cool down the refrigeration host 31; the two water circulation systems They are not connected to each other, operate independently, and are connected to the refrigeration host 31 through their own pipelines; the refrigeration host 31 has corresponding water outlets and water inlets for the two water circulation subsystems connected thereto.

The chilled water circulation subsystem includes a refrigeration host 31, a chilled water pump 34, a water distributor 35, a water collector 36, and terminal access equipment including the refrigeration coil 15; the chilled water outlet of the refrigeration host 31, the chilled water pump 34, The water separator 35, the water supply pipe 16 of the refrigeration coil 15, the refrigeration coil 15, the return pipe 17 of the refrigeration coil 15, the water collector 36, and the chilled water inlet of the refrigeration host 31 are connected in sequence through pipelines to form a closed water circulation loop.

The cooling water circulation system includes a cooling host 31, an outdoor cooling tower 32, and a cooling water pump 33; the cooling water outlet of the cooling host 31, the outdoor cooling tower 32, the cooling water pump 33, and the cooling water inlet of the cooling host 31 are connected in sequence to form a closed water cycle circuit.

The chilled water produced by the refrigeration main unit 31 is injected into the water separator 35 after being pressurized by the chilled water pump 34, and the chilled water is supplied to each terminal access equipment by the water distributor 35, and the terminal access equipment of the cooling system includes each charger The refrigeration coil 15 of the air-cooling system inside the machine, and the terminal air-conditioning units in each room in the charging station; the chilled water that flows out from each terminal connected to the equipment, the water temperature has been raised, is collected by the water collector 36, and then flows back to Cool down in the cooling host 31 ; the cooling water flowing out of the cooling host 31 is cooled by the outdoor cooling tower 32 , and then injected into the cooling host 31 after the cooling water pump 33 is pressurized.

At the ends of the water supply pipe 16 and the water return pipe 17 , on both sides of the cooling coil 15 , flow control valves 37 are respectively connected to control the flow of chilled water in the cooling coil 15 .

The flow chart of the control method corresponding to the first embodiment is shown in Figure 3:

The control method of the 1st embodiment is:

The electric vehicle charger has three working states: charging, standby and shutdown;

When the charger is in the charging state, the refrigeration coil 15 works in the cooling state, and according to the different charging stages, the cooling subroutine in the constant current charging stage and the cooling subroutine in the constant voltage charging stage are run successively;

When the charger is in the standby or shutdown state, the cooling coil 15 stops cooling, the flow control valve 37 is closed, and the air inlet fan and the air outlet fan stop rotating;

When the charger is in the standby state, it waits to transfer to the charging state;

When the charger enters the shutdown state, the program ends, and the power supply of the charger is manually cut off.

The charging method of the electric vehicle power battery is the constant current and constant voltage method: the constant current charging is carried out first, the battery voltage gradually increases, the output power of the charger increases accordingly, and the temperature of the power device continues to rise; when the battery voltage reaches the constant voltage charging After the voltage is turned to constant voltage charging, the charging current gradually decreases, the output power of the charger decreases accordingly, and the temperature of the power device continues to drop; when the charging current drops to the charging termination current, the charging ends, the charger cuts off the output, into standby mode.

When the charger is in the standby state, the control device 9 in the cabinet is in the running state, the driving circuit in the charging module 8 stops triggering, the power conversion circuit is in the off state, but the control circuit is still in the running state; When the process ends and the next charging process is not started, it is in the standby state; when the charger is in the shutdown state, the control device 9 and the charging module 8 are in the power-off state; the charger should be in the shutdown state when it is overhauled or idle for a long time.

The program flow chart corresponding to the cooling subroutine in the constant current charging stage in Embodiment 1 is shown in Figure 4:

The cooling subroutine in the constant current charging stage is as follows: the chilled water in the cooling coil is at the lowest flow rate, and the air inlet fan and the air outlet fan are at the lowest speed; as the temperature of the power device gradually increases, gradually increase the chilled water flow rate; When the flow of chilled water reaches the maximum and the temperature of the power device is still at the temperature control upper limit, gradually increase the speed of the inlet fan and the fan of the outlet; when the flow of chilled water and the speed of the fan both reach the maximum, the temperature of the power device remains When it is at the upper limit of temperature control, maintain the maximum flow of chilled water and the maximum speed of the fan, the device will alarm and request manual intervention; when the constant current charging phase is over, maintain the flow of chilled water and the speed of the fan, and release the over-temperature alarm.

The refrigeration coil 15 operates in a cooling state in this subroutine.

In the early stage of charging, the air inlet fan and the air outlet fan keep rotating at a low speed, which is beneficial to suppress the noise of the charger when it is working.

Although the higher the operating temperature of the power device, the shorter its life, but reducing its temperature requires increasing the energy consumption of the air cooling system, increasing the noise of the fan when it is running, and maintenance costs such as fan replacement and dust filter cleaning. The temperature increase of the power device can also reduce the relative humidity of the air around the power device. In the current design, it is more inclined to make the temperature of the power device close to the high temperature area of its allowable operating temperature range. Usually, the upper limit of the temperature control of the power device is 70°C, and the lower limit of the temperature control is 40°C.

Because power devices have a certain thermal inertia, after adjusting the flow rate of chilled water or the speed of the fan, a period of delay is required to judge the effect of the adjustment.

In the constant current charging stage, the temperature of the power device gradually rises, and it does not consider reducing the flow of chilled water or the speed of the fan by itself.

In the constant current charging stage, the temperature of the power device rises gradually. If an over-temperature alarm occurs, the operator must pay attention to it, and manual reset is required to release the alarm; after entering the constant voltage charging stage, the temperature of the power device gradually decreases. For the alarm triggered by the constant current charging stage, it is allowed to cancel itself, but it must be recorded in the historical record of the alarm event; after transferring to the constant voltage charging stage, if the power device is still in the overtemperature state, the alarm will be triggered again.

The power electronic power device is the main heat source in the charging module 8, and its temperature is higher than that of other heating devices in the charging module 8; there are multiple charging modules 8 in the charger, and there are multiple radiators in each charging module 8. Each heat sink is equipped with a temperature measuring element; when controlling the air cooling system, the temperature of the power device is based on the highest value of the temperature measured by all the temperature measuring elements in all charging modules.

The program flow chart corresponding to the cooling subroutine in the constant voltage charging stage in Example 1 is shown in Figure 5:

The cooling subroutine in the constant voltage charging stage is: maintain the original flow of chilled water in the cooling coil, maintain the original speed of the inlet fan and outlet fan; as the temperature of the power device gradually decreases, gradually reduce the inlet fan and the speed of the air outlet fan; when the speed of the fan is reduced to the minimum and the temperature of the power device is still at the lower limit of temperature control, gradually reduce the flow of chilled water; when the flow of chilled water and the speed of the fan are both reduced to the minimum, the power device When the temperature of the power device is still at the lower limit of the temperature control, keep the minimum flow of chilled water and the minimum speed of the fan; when the temperature of the power device is at the upper limit of the temperature control, keep the flow of chilled water and the speed of the fan After a period of delay, the alarm is automatically released; when the constant voltage charging phase is over, the flow control valve of the chilled water system is turned off, and the fan stops rotating.

The refrigeration coil 15 operates in a cooling state in this subroutine.

At the beginning of the constant voltage charging stage, the charging current decreases rapidly, and then the current decline rate will gradually slow down; although the power device has a certain thermal inertia, after entering the constant voltage charging stage, the temperature of the power device is difficult to continue to rise, so It is not considered to increase the flow of chilled water or the speed of the fan by itself.

During the constant voltage charging stage, the temperature of the power device decreases gradually. If an over-temperature alarm occurs, it is allowed to release after a delay, but it must be recorded in the historical record of the alarm event; after the delay, if the temperature of the power device cannot be effectively reduced, it will still In the over-temperature state, the alarm will continue; at the end of the constant voltage charging stage, the temperature of the power device gradually approaches the air temperature in the cabinet, and the over-temperature alarm should be automatically released.

The air cooling system of the second embodiment provided by the utility model is shown in Figure 6:

The second embodiment provided by the utility model is used for an outdoor charger in an electric vehicle charging station. Outdoor chargers are required to be dust-proof and splash-proof. In order to achieve the protection effect, the opening area of the vent needs to be reduced. The air inlet pre-cooling device is installed at the air inlet, and by reducing the inlet air temperature, the air-cooling cooling effect is ensured at a lower air flow rate, and the contradiction between the protection of the cabinet shell and the heat dissipation of the power device is solved; since it is an outdoor charger, this embodiment also The erosion of the "breathing" effect can be prevented, and the freezing water in the refrigeration coil 15 can be prevented from freezing at low temperature.

The 2nd embodiment provided by the utility model makes the following changes on the basis of the 1st embodiment:

Install a dustproof filter 10 on the inside of the steel wire protective net at the air inlet 6 of the charging cabinet, and install a dustproof isolation net 11 on the inner side of the steel wire protective net at the air outlet 7 of the charging cabinet for dustproof and splash-proof; The dust-proof filter screen 10 at the tuyere 6 has the function of holding dust and filtering, while the dust-proof isolation net 11 at the air outlet 7 only has the function of dust-resistance. Small.

Install a temperature sensor at the air inlet 6 of the cabinet to measure the temperature of the air outside the cabinet and calculate the temperature difference between the power electronic power device in the charging module 8 and the air outside the cabinet. During the heating phase of the power device, the "breathing" effect causes the gas in the device cavity to flow outward, and during the cooling phase, the "breathing" effect causes the outside gas to flow into the cavity; therefore, during the cooling phase of the power device, the Reduce the relative humidity of the air in the intake air until the temperature of the power device is consistent with the temperature of the air outside the cabinet. By precooling the incoming air, the temperature of the power device can be lower than the air temperature outside the cabinet. Since the power electronic power device is the main heat source in the charging module 8, when its temperature is lower than the air temperature outside the cabinet, the temperature of other heat generating devices is also lower than the air temperature outside the cabinet.

At both ends of the refrigeration coil 15, a bypass pipe 38 is installed on the water supply and return pipes close to the flow control valve 37. The bypass pipe 38 prevents the water supply pipe 16 and the return water pipe 17 from passing through the chilled water circulation pipe behind the flow control valve 37. The two ends of the bypass pipe 38 are equipped with an electric check valve 39, and a circulating water pump 40 is installed on the pipeline of the bypass pipe 38; the circulating water pump 40 is close to the electric check valve 39 on the side of the water supply pipe 16. An electric drain valve 41 is installed between 40 and the electric check valve 39 on the side of the return pipe 17; , so that the water stored in the refrigeration coil 15 is discharged from the electric drain valve 41 through the return pipe 17 and the bypass pipe 38, and then injected into the drainage system in the electric vehicle charging station through the drain pipe 20; the electric check valve 39, the bypass pipe 38. The circulating water pump 40 and the electric drain valve 41, together with the flow control valve 37, are installed on the lower side of the air duct in the casing 2.

When the charger is in the standby state, the flow control valve 37 is closed, and the chilled water in the cooling coil 15 is in a stagnant state; since the cooling coil 15 is in direct contact with the outside air, when the temperature outside the cabinet is lower than zero, the cooling water in the cooling coil 15 The frozen water in a stagnant state is easy to freeze; when the flow control valve 37 is closed and the air temperature outside the cabinet is close to zero, the electric check valve 39 is opened, and the circulating water pump 40 is turned on, forcing the frozen water in the refrigeration coil 15 and the bypass pipe 38 to It is in a flowing state to prevent the freezing water in the pipeline from freezing.

When the charger is in the shutdown state, the flow control valve 37 is closed, and the chilled water in the cooling coil 15 is in a stagnant state, the electric drain valve 41 on the bypass pipe 38 is opened, and the water in the cooling coil 15 and the bypass pipe 38 is drained. keep water.

Since the water supply pipe 16 and the water return pipe 17 are wrapped with heat-insulating sleeves, and most of the water supply and return pipes are located in the cable trench 5, the temperature in the cable trench 5 in winter is higher than the air temperature outside the cabinet, and the flow control valve 37 The final chilled water circulation pipeline is not easy to freeze.

The cooling system attached to the air-cooling system in the second embodiment is shown in Figure 7:

The second embodiment provided by the utility model is based on the first embodiment. For the chilled water circulation subsystem, at both ends of the refrigeration coil 15, the pipes of the water supply pipe 16 and the return pipe 17 close to the flow control valve 37 Install bypass pipe 38 additional on the road, the two ends of bypass pipe 38 are equipped with electric check valve 39, also be equipped with circulating water pump 40 and electric drain valve 41 on the pipeline of bypass pipe 38.

The flow chart of the control method corresponding to the second embodiment is shown in Figure 8:

The control method of the 2nd embodiment is:

The electric vehicle charger has three working states: charging, standby and shutdown;

When the charger is in the charging state, the circulating water pump and the electric check valve of the bypass pipe are in the closed state. According to the different charging stages, when the charger is in the constant current charging state, the cooling coil 15 works in the cooling state. The cooling subroutine in the constant current charging stage, when the charger is in the constant voltage charging state, the cooling coil 15 works in the dehumidification state, and the dehumidification subroutine in the constant voltage charging stage is run;

When the charger is in the standby or shutdown state, the cooling coil 15 stops cooling, the flow control valve 37 is closed, and the air inlet fan and the air outlet fan stop rotating;

When the motor is in the standby state, run the subroutine to prevent the cooling coil from freezing, and wait for it to enter the charging state;

When the charger enters the shutdown state, open the electric drain valve 41 on the bypass pipe 38, drain the water stored in the cooling coil 15 and the bypass pipe 38, and then close the electric check valve of the circulating water pump and the bypass pipe. At the end of the program, manually cut off the power supply of the charger.

In order to prevent the erosion of the "breathing" effect, in the constant voltage charging state, as the temperature of the power device gradually decreases, the intake air should be dehumidified to reduce the relative humidity of the air in the intake air, and prevent the water vapor and contained in the intake air. Soluble chemical pollutants enter the interior of the device; during the heating phase of the power device, the "breathing" effect causes the gas in the device cavity to flow outward; during the cooling phase, the "breathing" effect causes the outside gas to flow into the cavity; when Water vapor in the incoming air condenses on the fins of the cooling coil and drips into the drain pan, removing soluble chemical contaminants along with the water vapor.

The cooling subroutine in the constant current charging stage in Embodiment 2 is the same as the cooling subroutine in the constant current charging stage in Embodiment 1.

The dehumidification subroutine in the constant voltage charging stage in Example 2 is shown in Figure 9:

The dehumidification subroutine in the constant voltage charging stage is: increase the flow rate of chilled water in the cooling coil to the maximum, maintain the original speed of the air inlet fan and the air outlet fan; gradually reduce the speed of the air inlet fan and the air outlet fan; when the temperature of the power device is higher than the air temperature outside the cabinet, the speed of the fan is reduced to the minimum, and when the temperature of the power device is at the lower limit of temperature control, keep the minimum speed of the fan and the maximum flow rate of chilled water; when the temperature of the power device is higher than the air temperature outside the cabinet, and the temperature of the power device is at the upper limit of temperature control, the maximum flow rate of chilled water and the original speed of the fan remain unchanged, and the device alarms. After a time delay, the alarm is automatically released; when the temperature of the power device is lower than the air temperature outside the cabinet, the flow control valve of the chilled water system is turned off, and the fan stops rotating.

The cooling coil 15 runs in the dehumidification state in this subroutine; in this subroutine, the chilled water flow rate of the cooling coil 15 is kept at the maximum, the surface temperature of the cooling coil is reduced to the minimum, and the temperature of the fins on the cooling coil is higher. The lower the value, the better the dehumidification effect.

The subroutine for preventing refrigeration pipe from freezing in embodiment 2 is as shown in Figure 10:

The subroutine to prevent the refrigeration tube from freezing is:

When the charger is in the standby state, the flow control valve 37 is closed, and the air inlet fan and the air outlet fan stop rotating;

When the charger is in the standby state and the air temperature outside the cabinet is close to zero, the electric check valve 39 is opened, the circulating water pump 40 is started, and the water in the pipeline circulates in the pipeline between the cooling coil 15 and the bypass pipe 38 , to prevent the pipeline from freezing; when the air temperature outside the cabinet exceeds zero, close the electric check valve 39 of the circulating water pump 40 and the bypass pipe;

When the charger finishes the standby state, close the electric check valve 39 of the circulating water pump 40 and the bypass pipe.

When the charger is in the charging state, the flow control valve 37 is opened, the electric check valve 39 is closed, and the chilled water in the chilled water circulation subsystem flows into the refrigeration coil 15;

When the charging machine is in a shutdown state, open the electric drain valve 41 on the bypass pipe 38 to drain the water stored in the refrigeration coil 15 and the bypass pipe 38.

The air-cooling system of the 3rd embodiment that the utility model provides is as shown in Figure 11:

The third embodiment provided by the utility model is used for outdoor chargers in electric vehicle charging stations in air-polluted areas. Outdoor chargers in air-polluted areas not only need to be dust-proof and splash-proof, but also need to prevent PM10 and PM2.5 suspended particles in the air, as well as soluble chemical pollutants contained in water vapor in the air. The dust removal and dehumidification device is installed at the tuyere, and the suspended particles in the air intake are removed through the electrostatic air filter 22 in the dust removal and dehumidification device, and the water vapor and soluble chemical pollution contained in the intake air are removed by the cooling coil 15 operating in a dehumidification state things.

The 3rd embodiment provided by the utility model makes the following changes on the basis of the 2nd embodiment:

Remove the steel wire protective net and dust-proof filter 29 at the air inlet 6 of the charging cabinet, and install a protective shutter 21 at the air inlet 6, whose protection level meets IP44, and is used to prevent static electricity after fingers or hand-held slender objects touch the protective shutter 21 The high-voltage electrified part in the air filter 22 can prevent water showering outside the cabinet, water spray or water splashing from entering the electrostatic air filter 22 behind the window.

At the rear of the air inlet 6, an electrostatic air filter 22 is installed in the box 2 carrying the refrigeration coil 15, so that it changes from an air inlet precooling device to a dust removal and dehumidification device; Felt sealing strips are pressed on the joints of the box to make it a closed box, which is used to prevent the leakage of suspended particles and water vapor in the dust removal and dehumidification device.

A felt sealing strip is pressed between the frame and the cladding of the cabinet to make the cabinet an airtight cabinet, which is used to prevent suspended particles and water vapor in the air from entering the cabinet from the joint of the frame and the cladding; install partitions inside the cabinet 4. Divide the cabinet into upper and lower compartments. The lower compartment communicates with the cable trench 5 at the lower part of the cabinet. Felt sealing strips are pressed on the joints between the partition plate 4 and the four walls of the cabinet to prevent dust in the cable trench. and pollutants enter the upper compartment; the upper compartment has a charging module 8 and a control device 9, and the lower compartment has a dust removal and dehumidification device and a cabinet terminal block 12; the dust removal and dehumidification device box 2 is located in the lower compartment, and the box 2 The air outlet 24 is located in the upper compartment, and the joint between the box body 2 and the partition 4 is pressed with a felt sealing strip; the cable 13 going up from the cable trench 17 is connected to the cabinet at the terminal block 12, and the cable from the terminal block 12 is connected to the cabinet. The upward cable 13 is connected to the charging module 8 and the control device 9 after passing through the isolation hole sleeve 14 on the partition 4 .

After the charger is powered off and shut down, the electrostatic air filter 22 and the refrigeration coil 15 will stop working. At this time, the air inlet 6 and the air outlet 7 of the cabinet should be closed with a buckle cover, and a felt sealing strip is pasted on the edge of the buckle cover. After the buckle cover is fastened, it will prevent the suspended particles and water vapor in the air from entering the inside of the cabinet.

The cooling system assigned to the air-cooling system in the third embodiment is the same as the cooling system assigned to the air-cooling system in the second embodiment.

The structure and device layout of the dust removal and dehumidification device in Example 3 are shown in Figure 12:

The dust removal and dehumidification device in the third embodiment makes the following changes on the basis of the air inlet precooling device in the second embodiment:

An electrostatic air filter 22 is installed in the air duct in the box body 2. Along the airflow direction in the air duct, the air inlet 6, protective shutters 21, electrostatic air filter 22, air intake fan, refrigeration coil 15, S-shaped Air duct 23 and the air outlet 24 of box body.

The electrostatic dust-proof filter has a capture efficiency of more than 99% for small-sized dust with a particle size greater than 0.5 μm, and its filtering effect on PM10 and PM2.5 suspended particulate matter is significantly better than traditional dust-proof filters; The wind resistance is only one-third of that of the traditional dust-proof filter. When the air flow remains unchanged, the fan speed can be reduced to reduce the noise of the charger when it is working.

The air intake fan is located at the rear of the electrostatic air filter 22, which can prevent the suspended particles in the air from adhering to the fan blades or entering the fan core, causing the fan blades to jam or rotate with increased vibration and increased noise; the cooling coil 15 is located at the The rear part of the electrostatic air filter 22 prevents suspended particles in the air from adhering to the cooling coil 15 after mixing with the condensed water.

When the charger is in the charging and standby state, the cooling coil 15 is running in the dehumidification state, the frozen water in the cooling coil 15 keeps the maximum flow rate, the frozen water flows continuously, and cannot be frozen. Check valve 39, bypass pipe 38 and circulating water pump 40.

When the charger is in the shutdown state, the flow control valve 37 is closed, and the frozen water in the cooling coil 15 is in a stagnant state; The connecting end of the water return pipe 17; after the charger is shut down, open the electric drain valve 41, drain the stored water in the cooling coil 15, and inject the stored water into the drainage system in the electric vehicle charging station through the drain pipe 20.

The water supply pipe 16, the return pipe 17 and the drain pipe 20 below the refrigeration coil 15 pass through the bottom of the box body 2, and a felt sealing ring 28 is pressed at the joint between the above-mentioned pipes and the bottom plate of the box body 2 to prevent the box body 2 from The suspended particles and water vapor in the air leak out; the ash outlet 26 of the ash hopper 25 below the electrostatic air filter 22 is inlaid on the bottom plate of the box body 2, and the joint between the exposed part of the ash outlet 26 and the bottom plate of the box body 2 is also pressed Felt sealing ring 28 is arranged.

The flow chart of the control method corresponding to the third embodiment is shown in Figure 13:

The control method of the 3rd embodiment is:

After the electric vehicle charger is turned on, open the cover that seals the air inlet 6 and the air outlet 7;

The electric vehicle charger has three working states: charging, standby and shutdown;

When the charger is in the charging or standby state, the electrostatic air filter 22 is in the working state, the cooling coil 15 is in the dehumidification state, the flow of chilled water in the cooling coil 15 maintains the highest gear, and the air inlet fan and the air outlet fan keep rotating ;

When the charger is in the charging state, the refrigeration coil 15 works in the dehumidification state, and according to the different charging stages, the dehumidification subroutine in the constant current charging stage and the dehumidification subroutine in the constant voltage charging stage are run successively;

When the charger is in the standby state, the flow of chilled water is at the highest gear, and the speed of the inlet fan and outlet fan is at the lowest gear, waiting to be transferred to the charging state;

When the charger is in a shutdown state, the electrostatic air filter 22 is closed, the cooling coil 15 stops dehumidification, the flow control valve 37 is closed, the air inlet fan and the air outlet fan stop rotating, and the valve located at the connection end of the cooling coil 15 and the return pipe 17 is opened. After the electric drain valve 41 puts the water stored in the refrigeration coil 15, the program ends, and the air inlet 6 and the air outlet 6 are manually covered with a buckle cover, and the power supply of the charger is cut off.

Since the chilled water in the refrigeration coil 15 maintains the maximum flow rate in the charging and standby states, there is no subroutine for preventing the freezing of the refrigeration pipe in this embodiment.

When the cover of the air inlet 6 and the air outlet 7 is opened, the air inlet 6 prevents the entry of suspended particles and water vapor through the electrostatic air filter 22 and the cooling coil 15, and the air outlet 7 rotates through the dustproof isolation net 11 and the air outlet fan The resulting airflow prevents the entry of suspended particles and water vapor.

The program flow chart corresponding to the dehumidification subroutine in the constant current charging stage in Embodiment 3 is shown in Figure 14:

The dehumidification subroutine in the constant current charging stage is:

The chilled water in the cooling coil is at the maximum flow rate, and the inlet fan and outlet fan are at the lowest speed; as the temperature of the power device gradually rises, keep the chilled water flow constant, and gradually increase the inlet fan and outlet fan When the speed of the fan reaches the maximum and the temperature of the power device is still at the upper limit of the temperature control, the maximum flow of chilled water and the maximum speed of the fan are maintained, and the device alarms, requesting manual intervention; when the constant current charging phase is over, keep freezing The maximum flow of water and the original speed of the fan will release the over-temperature alarm.

The refrigeration coil 15 operates in a dehumidification state in this subroutine, and the chilled water flow in the refrigeration coil is always at the highest gear.

The dehumidification subroutine in the constant voltage charging stage in Example 3 is shown in Figure 15:

The dehumidification subroutine in the constant voltage charging stage in embodiment 3 is basically the same as the dehumidification subroutine in the constant voltage charging stage in embodiment 2, the difference is that: when the subroutine ends in this embodiment, the frozen water in the refrigeration coil remains at the maximum Flow, inlet fan and outlet fan turn to minimum speed.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is still possible Any modification or equivalent replacement made to the specific implementation of the present utility model without departing from the spirit and scope of the present utility model shall be covered by the claims of the present utility model.

Claims (11)

1. an air cooling system for electric automobile battery charger, comprises its underpart backboard and leaves the rack (1) that air inlet (6) and its upper front plate leave air outlet (7); It is characterized in that: the front end of described air inlet (6) is disposed with the refrigeration coil (15) that air inlet fan and its pipeline are vertically placed in S shape airduct (23) air inlet one end; The air outlet (24) of described S shape airduct (23) points to described rack (1) front upper place; The rear end of described air outlet (7) is disposed with air ejector fan and charging module (8); Described charging module (8) top is provided with control device (9).

2. air cooling system as claimed in claim 1, is characterized in that:

Described rack (1) backboard is provided with the air inlet (6) that its air inlet is described rack (1), its air outlet is the closed box (2) of the air outlet (24) of described S shape airduct (23); Described air inlet fan, described S shape airduct (23), described refrigeration coil (15) are arranged in described closed box (2); The effective of described refrigeration coil (15) crosses effective incoming air area that wind area equals described air inlet (6), equals effective air-out area of the air outlet (24) of described S shape airduct (23).

3. air cooling system as claimed in claim 2, is characterized in that:

The air inlet (6) of described rack (1) is provided with steel wire protection network or protection shutter (21), the air outlet (7) of described rack (1) and the air outlet (24) of described S shape airduct (23) are provided with steel wire protection network.

4. air cooling system as claimed in claim 2, is characterized in that:

The air intake of described refrigeration coil (15) is connected with feed pipe (16), its outlet air end is connected with return pipe (17), be provided with water-collecting tray (18) bottom it, described water-collecting tray (18) bottom is provided with non-return valve (19) and drainage pipe (20);

After described feed pipe (16) and described return pipe (17) pass described S shape airduct (23) downside tube wall, described closed box (2) base plate and described rack (1) base plate successively, be connected with the chilled water cycle subsystem of cold supply system in station;

Condensed water in described water-collecting tray (18) is entered the drainage system in station after passing described closed box (2) base plate and described rack (1) base plate successively by described drainage pipe (20).

5. air cooling system as claimed in claim 4, is characterized in that:

Described cold supply system is made up of the chilled water cycle subsystem be connected with refrigeration host computer (31) and cooling water circulation subsystem;

Described refrigeration host computer (31) is provided with chilled water water inlet, chilled water delivery port, cooling water intake, cooling water outlet;

Described chilled water cycle subsystem comprises chilled water pump (34), water knockout drum (35) and water collector (36); The chilled water water inlet of the chilled water delivery port of described refrigeration host computer (31), described chilled water pump (34), described water knockout drum (35), described feed pipe (16), described refrigeration coil (15), described return pipe (17), described water collector (36), described refrigeration host computer (31) is connected successively, forms closed water-flow circuit;

Described cooling water circulation subsystem comprises outdoor cooling tower (32), cooling water pump (33); The cooling water intake of the cooling water outlet of described refrigeration host computer (31), described outdoor cooling tower (32), described cooling water pump (33), described refrigeration host computer (31) is connected successively, forms closed water-flow circuit.

6. air cooling system as claimed in claim 4, is characterized in that:

Described feed pipe (16) in described closed box (2) and described return pipe (17) are provided with flow control valve (37), for controlling the chilled-water flow in refrigeration coil (15).

7. air cooling system as claimed in claim 1, is characterized in that:

Described charging module (8) comprises level and is embedded in cabinet on described rack (1) front panel, and is arranged on transformer, reactor, digital signal processor and the power electronic power device in described cabinet; Described transformer and described reactor are arranged on both sides, air channel in described cabinet; Described digital signal processor and described power electronic power device are arranged on air channel central authorities in described cabinet, and described power electronic power device is near described cabinet afterbody; Described cabinet afterbody is provided with steel wire protection network;

Described power electronic power device is provided with radiator; Heat conductive silica gel is perfused with between described radiator and described power electronic power device.

8. air cooling system as claimed in claim 6, is characterized in that:

The bypass pipe (38) that two ends are communicated with feed pipe (16) with return pipe (17) is respectively provided with between described refrigeration coil (15) with described flow control valve (37); Described bypass pipe (38) is provided with two electronic logical only valves (39), and being positioned at described two electronic logical circulating water pumps (40) only between valve (39) and electric draining valve (41), described bypass pipe (38) is communicated with drainage pipe (20) by electric draining valve (41).

9. air cooling system as claimed in claim 3, is characterized in that:

Anti-dust filter mesh (10) is installed inside the steel wire protection network of described air inlet (6), be provided with dust-proof separation net (11) inside the steel wire protection network of described air outlet (7), described air inlet (6) place is provided with the temperature sensor measuring cabinet outer air temperature.

10. air cooling system as claimed in claim 3, is characterized in that:

Protection shutter (21) outside of described air inlet (6) is provided with dismountable buckle closure, is provided with electrostatic air filter (22) between described protection shutter (21) and described air inlet fan; Described electrostatic air filter (22) bottom is provided with its ash hole (26) and is embedded in ash bucket (25) on closed box (2) base plate.

11. air cooling systems as claimed in claim 2, is characterized in that:

The dividing plate (4) perpendicular to described rack (1) backboard is provided with between described closed box (2) and charging module (8), described S shape airduct (23) is embedded in described dividing plate (4), described dividing plate (4) is pressed with felt seal bar with the seam crossing of described rack (1), described dividing plate (4) is provided with taper isolation borehole jack (14) of walking for cable (13).