VVVF inverter box

Abstract

The utility model relates to the technical field of rail transit equipment, and discloses a VVVF inverter box which comprises a box body, a first bin used for placing a power module is arranged in the box body, a ventilation hood is arranged on the outer surface of the side wall of the box body, the ventilation hood and the first bin are arranged adjacently, a radiator of the power module is placed in the ventilation hood, and the first bin is arranged in the ventilation hood. Through holes are formed in multiple surfaces of the ventilation hood, and internal airflow of the ventilation hood and internal airflow of the box body do not circulate; the utility model aims to solve the technical problem that an air channel for air flow to circulate occupies the internal space of a box body in the existing inverter box.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit equipment, and particularly relates to a VVVF inverter box. Background Art

[0002] The main circuit of the traction inverter adopts a two-level voltage source DC-AC inverter circuit; when the vehicle is in the traction mode, the DC supply voltage enters the inverter through high-voltage electrical appliances such as a high-speed circuit breaker, a line contactor, and a reactor, and after inversion by the inverter, three-phase variable-frequency variable-voltage (VVVF) alternating current is output to supply power to the asynchronous traction motor; when the vehicle is in the regenerative braking mode, the power module operates in the rectification mode.

[0003] For example, in the Chinese patent "Inverter Chassis" with the authorized publication number CN 202395676 U, the structure of the inverter box is provided with an air duct for accommodating a radiator in the module bin, and all the incoming air must first flow through the radiator, and the incoming air is restricted to flow in the air duct, and the air flow in the air duct flows through the reactor bin and then to the air outlet to extend the flow path.

[0004] Now, in order to meet the rail transit over a relatively long distance from the urban area to the suburbs, a dual-system train is adopted, and a dual-circuit of DC-AC and AC-DC-AC needs to be realized; if the above-mentioned inverter box structure is used to assemble the inverter of the dual-system train, it is no longer applicable. The above technology sets an air duct in the inverter box, resulting in a large gap, i.e., the air duct, between the electrical components in the inverter box. Although the heat dissipation is improved, with the increase of the corresponding electrical components, these air ducts, i.e., the gaps, will occupy a large space, making the volume of the box body large; at the same time, a large amount of external environmental air flowing through the box body will increase the risk of adverse effects of the external environment on the internal components, and the hot air after heat exchange with the radiator will continue to flow through other electrical components, which will also affect the heat dissipation of other electrical components. Summary of the Utility Model

[0005] The utility model aims to provide a VVVF inverter box to solve the technical problem that the air duct for air flow in the existing inverter box occupies the internal space of the box body.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a VVVF inverter box includes a box body. The box body includes a first bin for placing a power module. A ventilation hood is provided on the outer surface of the side wall of the box body, and the ventilation hood is adjacent to the first bin. The radiator of the power module is placed in the ventilation hood. Through holes are provided on multiple sides of the ventilation hood, and the internal air flow of the ventilation hood and the internal air flow of the box body do not communicate with each other.

[0007] The principle and advantages of this solution are as follows: The radiator is fixed on the ventilation hood, enabling the radiator to directly exchange heat with the air outside the box body without the need to additionally set up an air duct inside the box body; the air for heat exchange flows in from one side of the ventilation hood with through holes and flows out from the other side of the ventilation hood with through holes, and the air flow does not enter the box body, creating conditions for increasing the flow velocity and flow rate of the air flow to improve the heat dissipation effect; the sealing performance of the box body is improved to prevent the external environment from having an adverse impact on the components inside the box body; and the ventilation hood is adjacent to the first compartment, shortening the connection length between the radiator and the power module.

[0008] As an improvement, the ventilation hood is in the shape of an inclined parallelepiped. The ventilation hood includes a bottom surface, a top surface, a front end surface, a rear end surface, and two side surfaces. One of the side surfaces of the ventilation hood is not sealed, and this unsealed side surface is closely attached to the side wall of the box body and fixed on the outer surface of this side wall. The other side surface of the ventilation hood is parallel to the side wall of the box body. The front end surface and the rear end surface of the ventilation hood are perpendicular to the side wall of the box body, and the top surface of the ventilation hood forms an angle less than 90° with the side wall of the box body.

[0009] The bottom surface, the top surface, the front end surface, and the rear end surface of the ventilation hood are all provided with the through holes arranged neatly, and the through holes are diamond-shaped holes.

[0010] The beneficial effect of this improvement is that the whole ventilation hood is inclined upward obliquely, and the air flow passing through the bottom surface of the ventilation hood will generate a small lift force to share part of the weight of the inverter box; through holes are provided on the two symmetrical surfaces of the ventilation hood, enabling a convective through wind to form between the parallel surfaces and thus avoiding the air flow disorder inside the ventilation hood, and the neatly arranged diamond-shaped holes can increase the ventilation area and reduce the wind resistance.

[0011] As an improvement, a discharge resistor is also placed in the first compartment. An opening is provided on the side wall of the box body, and the opening communicates the first compartment with the outside. A heat sink for shielding the opening is fixedly provided on the outer surface of the side wall of the box body, and the discharge resistor passes through the opening and is fixedly connected to the heat sink.

[0012] The beneficial effect of this improvement is that the discharge resistor is fixed to the heat sink, enabling the heat of the discharge resistor to be quickly taken away by the heat sink, and the multi-layer sheet structure of the heat sink is located outside the box body. As the train runs, the heat on the heat sink will also be quickly taken away by the air flow.

[0013] As an improvement, a second compartment for placing a controller module and a terminal block assembly is further included in the box body. The second compartment is located at the adjacent rear end of the first compartment. Maintenance doors are opened on both the left and right sides of the box body for the second compartment. The interface surface of the controller module and the terminal block assembly are installed in the second compartment. The interface surface of the controller module faces the maintenance door, and the interface surface of the controller module and the terminal block assembly are in a back-to-back state.

[0014] The beneficial effects of this improvement are as follows: The staff can install the controller module and the terminal block assembly through two maintenance doors, and the interface surfaces of the controller module and the terminal block assembly facing the maintenance doors also facilitate the maintenance work.

[0015] As an improvement, the ventilation cover and the heat sink are located on the same side of the first compartment, and the maintenance door is provided on the other side of the box body in the first compartment.

[0016] The beneficial effects of this improvement are as follows: It is convenient for the installation and maintenance of the power module.

[0017] As an improvement, the radiator is a heat pipe radiator, and the heat dissipation fins of the heat pipe radiator are fixedly installed in the ventilation cover.

[0018] The beneficial effects of this improvement are as follows: Since the heat pipe radiator does not require the installation of a cooling fan, the internal structure of the box body is more compact.

[0019] As an improvement, a slide rail for slidingly installing the power module is provided on the inner bottom surface of the first compartment.

[0020] The beneficial effects of this improvement are as follows: The power module can be pulled out of the box body by the slide rail, which is convenient for the maintenance work of the staff.

[0021] As an improvement, the top surface of the ventilation cover forms an 80° angle with the side wall of the box body.

[0022] As an improvement, lifting lugs for connecting with the vehicle body are symmetrically provided on both sides of the top of the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0024] Figure 2 It is a schematic structural diagram of an embodiment of the present invention.

[0025] Figure 3 It is a schematic structural diagram of an embodiment of the present invention.

[0026] Figure 4 It is a schematic structural diagram of the ventilation cover.

[0027] Figure 5 It is an internal structure diagram of the box body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following is a further detailed description through specific embodiments:

[0029] The reference numerals in the accompanying drawings of the specification include: a box body 1, a first compartment 2, a second compartment 3, a ventilation hood 4, a bottom surface 4a, a top surface 4b, a front end surface 4c, a rear end surface 4d, a side surface 4f, a through hole 5, an opening 6, a heat sink 7, a maintenance door 8, a slide rail 9, and a lifting lug 10.

[0030] Embodiment

[0031] Basically as shown in the appended Figure 1 and the appended Figure 5 As shown, a VVVF inverter box includes a box body 1. Inside the box body, there are a first compartment 2 for placing power modules and discharge resistors, and a second compartment 3 for placing controller modules and terminal block assemblies. The second compartment 3 is located at the adjacent rear end of the first compartment 2.

[0032] As shown in the appended Figure 2 and the appended Figure 3 As shown, a heat pipe radiator is provided inside the box body 1 to dissipate heat from the power modules. The substrate of the heat pipe radiator is closely attached to the power modules for installation. On the outer surface of the side wall of the box body 1, there is a ventilation hood 4. The ventilation hood 4 is arranged adjacent to the first compartment 2, and the heat dissipation fins of the heat pipe radiator are placed inside the ventilation hood 4.

[0033] As shown in the appended Figure 4 As shown, the ventilation hood 4 is in the shape of an oblique parallelepiped. The ventilation hood includes a bottom surface 4a, a top surface 4b, a front end surface 4c, a rear end surface 4d, and two side surfaces 4f. The bottom surface 4a is parallel to the top surface 4b, the front end surface 4c is parallel to the rear end surface 4d, and the two side surfaces 4f are parallel to each other. One side surface 4f of the ventilation hood 4 is not sealed. This unsealed side surface 4f is closely attached to the side wall of the box body 1 and is fixedly connected to the outer surface of this side wall by bolts, so that this unsealed side surface 4f of the ventilation hood 4 is closed by the side wall of the box body 1, and the inside of the ventilation hood 4 is not connected to the inside of the box body 1, and the air flow inside the ventilation hood 4 cannot enter the inside of the box body 1.

[0034] The other side surface 4f of the ventilation hood 4 is parallel to the side wall of the box body 1. The front end surface 4c and the rear end surface 4d of the ventilation hood 4 are perpendicular to the side wall of the box body 1. The top surface 4b of the ventilation hood 4 forms an 80° angle with the side wall of the box body 1, so that the ventilation hood 4 slopes obliquely upward relative to the connection with the box body 1.

[0035] Neatly arranged through holes 5 are provided on the bottom surface 4a, the top surface 4b, the front end surface 4c, and the rear end surface 4d of the ventilation hood 4. The through holes 5 are diamond-shaped holes.

[0036] The heat absorbed by the substrate from the power modules is transferred to the heat dissipation fins through the pipeline. The heat dissipation fins dissipate heat quickly with their large surface area. During the train running, a large amount of air enters the ventilation hood 4 through the through holes 5 to exchange heat with the heat dissipation fins, so that this heat dissipation structure does not need to be additionally provided with energy-consuming devices such as cooling fans, which saves energy and makes the structure more simple and compact, reducing the overall space.

[0037] As shown in the attached Figure 5 figure, an opening 6 is provided on the side wall of the box body 1. The opening 6 enables the first compartment 2 to communicate with the outside. A heat sink 7 for shielding the opening 6 is fixedly provided on the outer surface of the side wall of the box body 1. The discharge resistor passes through the opening 6 and is fixedly connected to the heat sink 7 by bolts.

[0038] The ventilation hood 4 and the heat sink 7 are located on the same side of the first compartment 2. A maintenance door 8 is provided on the other side of the box body 1 with respect to the first compartment 1; Maintenance doors 8 are provided on both the left and right sides of the second compartment 3 of the box body 1. The controller module interface surface and the terminal block assembly are installed in the second compartment 3 in a back-to-back state with the interface surface facing the maintenance door 8.

[0039] A slide rail 9 for slidably mounting the power module is provided on the inner bottom surface of the first compartment 2. The power module is slidably fitted on the slide rail 9. The installed power module can slide relative to the box body 1, and the power module can be pulled out of the box body 1 along the slide rail 9 through the maintenance door 8 of the first compartment 2. After the operation is completed, the power module is pushed back into the box body 1; Lifting lugs 10 for connecting with the vehicle body are symmetrically provided on both sides of the top of the box body 1.

[0040] The above are only the embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A VVVF inverter box, comprising a box body, wherein the box body comprises a first compartment for placing a power module, characterized in that: A ventilation hood is provided on the outer surface of the side wall of the box body, and the ventilation hood is arranged adjacent to the first bin. The heat sink of the power module is placed in the ventilation hood. Through holes are provided on multiple sides of the ventilation hood. The internal airflow of the ventilation hood and the internal airflow of the box body do not circulate with each other.

2. The VVVF inverter box according to claim 1, characterized in that: The ventilation hood is in the shape of an oblique parallelepiped, and includes a bottom surface, a top surface, a front face, a rear face, and two side surfaces, one of the side surfaces of the ventilation hood is unsealed, the unsealed side surface is in close contact with the side wall of the box and is fixed on the outer surface of the side wall, the other side surface of the ventilation hood is parallel to the side wall of the box, the front face and the rear face of the ventilation hood are perpendicular to the side wall of the box, and the top surface of the ventilation hood forms an angle of less than 90° with the side wall of the box; The bottom surface, top surface, front surface and rear surface of the ventilation hood are all provided with neatly arranged through holes, and the through holes are diamond-shaped holes.

3. The VVVF inverter box according to claim 2, characterized in that: The first bin is also used to place a discharge resistor. An opening is provided on the side wall of the box body, and the opening connects the first bin with the outside. A heat sink for shielding the opening is fixedly provided on the outer surface of the side wall of the box body, and the discharge resistor passes through the opening and is fixedly connected to the heat sink.

4. The VVVF inverter box according to claim 3, characterized in that: The box also includes a second compartment for placing the controller module and the terminal block assembly, the second compartment is located at the adjacent rear end of the first compartment, the box is provided with maintenance doors on both the left and right sides of the second compartment, the controller module interface surface and the terminal block assembly are installed in the second compartment, the interface surface of the controller module faces the maintenance door, and the controller module interface surface and the terminal block assembly are back to back.

5. The VVVF inverter box according to claim 4, characterized in that: The ventilation hood and the heat sink are located on the same side of the first bin, and the box body is provided with the maintenance door on the other side of the first bin.

6. The VVVF inverter box according to claim 5, characterized in that: The radiator is a heat pipe radiator, and the heat dissipation fins of the heat pipe radiator are fixedly installed in the ventilation cover.

7. The VVVF inverter box according to claim 5, characterized in that: The inner bottom surface of the first compartment is provided with a slide rail for slidingly installing the power module.

8. The VVVF inverter box according to claim 7, characterized in that: The top surface of the ventilation hood forms an angle of 80° with the side wall of the box body.

9. The VVVF inverter box according to claim 8, characterized in that: The top of the box body is symmetrically provided with lifting ears for connecting with the vehicle body.

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