A box for a converter of a multiple unit power unit and a box with a cooling unit

Abstract

The present invention relates to a box body for a power unit converter of a multiple unit train and a box body with a cooling unit. Among them, the box body for the power unit converter of the multiple unit train includes a top frame and a bottom plate. At both ends of the bottom plate, a first side plate and a second side plate are respectively fixed. An intermediate partition is provided between the two. A first clean room is formed between the intermediate partition and the first side plate, and a composite dirty room is formed between the intermediate partition and the second side plate. A first installation partition and a second installation partition are provided in the composite dirty room. A third installation partition is provided in the exact middle of the composite dirty room close to the second side plate. The first installation partition, the second installation partition and the third installation partition divide the composite dirty room into a second clean room, a third clean room, a fourth clean room and a main dirty room. The present invention can make the box body structure more compact, meet the requirement of installing more devices under the condition that the total installation space of the box body remains unchanged, and does not affect the installation and maintenance of the devices inside the power unit converter.

Description

Technical Field

[0001] The present invention relates to the technical field of converter boxes, and particularly to a box for a converter of a power unit of a multiple unit train and a box with a cooling unit. Background Art

[0002] In recent years, with the development of high-speed railways in China, the requirements of railway transportation for high-speed multiple unit trains have become increasingly high. As a core component of the traction system of a multiple unit train, the power unit converter integrates all the functions of a traction converter, an auxiliary converter, and a cooling unit. It is an important large-mass electrical component on a high-speed multiple unit train, and its excellent performance plays an increasingly important role in ensuring the high-speed and safe operation of the train.

[0003] In order to meet the usage conditions of cross-border interoperability, it is necessary to have an international rail transit technology, standard, equipment, and service capability system that meets the global market demand. However, the current multiple unit trains have the following problems when applied abroad:

[0004] 1. Since the climate differences among different countries in Eurasia are very large, the power unit converter, as a core component of a high-speed multiple unit train, should have high weather resistance. Currently, the minimum storage and operating temperature of the power unit converter of the multiple unit trains operating in China is not lower than -40°C, which cannot meet the requirements of -50°C operation and storage in Europe.

[0005] 2. Currently, all electrified railways in China adopt an AC traction power supply system of 25 kV (50 Hz). Abroad, there are various traction power supply systems in many countries and regions. Locomotives or multiple unit trains with multi-system switching can achieve cross-line operation of national railways, urban rail transit, and urban rail transit. This has led to a large increase in the number of electrical components in the power unit converter, and a five-level contactor for multi-system power supply needs to be added. At the same time, the increase in the power density of the power unit converter has led to higher performance requirements for the electrical components matching the traction system, and the volume and weight have increased accordingly. The increase in traction power density and the increase in the speed grade of the multiple unit train (the design speed is increased to 400 km / h) have significantly increased the heat dissipation requirements of each device, which requires the cooling and heat dissipation capacity of the cooling unit to be enhanced, and the volumes of the radiator, fan, and water pump have all increased. In addition, to give full play to the advantages of permanent magnet motors, such as higher power density, higher working efficiency, and lower noise, each power unit converter is matched with 4 permanent magnet synchronous motors (located outside the power unit converter). To prevent the back electromotive force generated by the permanent magnet motor from damaging components such as the power module of the power unit converter after the power unit converter stops working, 4 permanent magnet contactors need to be added inside the power unit converter for electrical isolation, which further increases the number, volume, and weight of electrical components.

[0006] However, due to the layout limitations of the EMU car body and the maintenance space limitations, in order to ensure that the power unit converter can be normally installed under the EMU car body and facilitate the later disassembly and maintenance work, the volume of its box has reached the limit at present and cannot be increased further. Currently, it is about 4m 3 or so. Therefore, under the condition that the total installation space of the box remains unchanged, how to install more devices has become an urgent problem to be solved at present, which puts forward higher requirements for the compactness of the box.

[0007] 3. In the prior art, the cooling water pipe is generally a rubber pipe. When connecting with the cooling water pump, it is inserted into a metal joint through the rubber pipe, and sealed by tightening with a clamp. However, this connection method has many problems. First, the rubber pipe is prone to aging. After the rubber deforms, the clamp will loosen, and it is often necessary to re-tighten the clamp torque after standing for a period of time, which is likely to cause liquid leakage at the joint. Second, the rubber pipe may crack due to cold brittleness at low temperatures and cannot be used in an environment of -50°C.

[0008] 4. In the prior art, the chopping resistor is generally installed at the upper position of the box, and there is a cavity directly below the chopping resistor, and no other devices are installed. When the chopping resistor needs to be repaired, only the corresponding bottom installation opening on the bottom plate needs to be opened, and the chopping resistor can be removed vertically. However, since there are rails for running wheels near the bottom installation opening, it affects the operation space and the operation is not convenient. At the same time, there is a bottom door panel at the bottom installation opening, and the locking bolts of this door panel need to be strung with steel wires to achieve anti-loosening. It is a structure that is not often disassembled, and the disassembly is relatively cumbersome. Therefore, the disassembly, installation and maintenance of the chopping resistor are not convenient.

[0009] Therefore, based on the experience and practice of being engaged in the relevant industry for many years, the inventor proposes a box for the power unit converter of an EMU and a box with a cooling unit to overcome the defects of the prior art. Summary of the Invention

[0010] The purpose of the present invention is to provide a box for the power unit converter of an EMU and a box with a cooling unit, which can make the box structure more compact, meet the requirement of installing more devices under the condition that the total installation space of the box remains unchanged, and does not affect the installation and maintenance of the internal devices of the power unit converter.

[0011] The purpose of the present invention can be achieved by the following technical solutions:

[0012] The present invention provides a box body for a converter of a power unit of a multiple unit train. The box body is in a rectangular shape and is installed under the car body of the multiple unit train. The box body includes a top frame and a bottom plate which are horizontally arranged at intervals up and down. At both ends of the bottom plate in the length direction, a first side plate and a second side plate which are vertically arranged are respectively fixed. Between the first side plate and the second side plate, an intermediate partition is fixedly arranged along the width direction of the bottom plate. The tops of the first side plate, the second side plate and the intermediate partition are fixedly connected to the top frame. A first clean room is formed between the intermediate partition and the first side plate, and a composite dirty room is formed between the intermediate partition and the second side plate.

[0013] In the composite dirty room, a first mounting partition and a second mounting partition are respectively arranged at the corner positions on both sides in the width direction near one end of the intermediate partition. A third mounting partition is arranged in the middle of the composite dirty room near the second side plate. The cross sections of the first mounting partition and the second mounting partition are in an L shape. The first mounting partition, the second mounting partition and the third mounting partition divide the composite dirty room into independent second clean room, third clean room, fourth clean room and a main dirty room. In the main dirty room, two wind shields with air inlet through holes are symmetrically arranged at positions adjacent to both sides in the width direction. One ends of the two wind shields are respectively fixed to the first mounting partition and the second mounting partition, and the other ends are both fixed to the second side plate. The two wind shields divide the main dirty room into a first dirty room close to the second clean room, a second dirty room in the middle and a third dirty room close to the third clean room.

[0014] The part of the second dirty room between the first dirty room and the third dirty room forms a fan installation room, and the part of the second dirty room between the second clean room and the third clean room forms a reactor installation room. On the bottom plate, a first installation opening and a second installation opening are respectively formed corresponding to the part of the fan installation room and the part of the reactor installation room. A first bottom door panel and a second bottom door panel are respectively arranged at the first installation opening and the second installation opening. A plurality of air outlet holes are formed in the second bottom door panel.

[0015] In a preferred embodiment of the present invention, a fan partition is arranged in the fan installation room along the width direction of the box body to divide the fan installation room into independent first fan room and second fan room. The second fan room is close to the third mounting partition. A plurality of air outlet holes are formed in the first bottom door panel corresponding to the part of the second fan room.

[0016] In a preferred embodiment of the present invention, the second bottom door panel includes a bottom plate and at least one air guide cover fixed on the upper surface of the bottom plate. Each air guide cover includes a box-shaped structure formed by at least one top surface and three inclined side surfaces with one side open. The open end faces the intermediate partition. Its top surface is parallel to the bottom plate, and the internal angles between its three inclined side surfaces and the top surface are all obtuse angles. A plurality of air outlet holes are formed in the bottom plate corresponding to the inner cavity area of each box-shaped structure.

[0017] In a preferred embodiment of the present invention, sound-absorbing cotton is provided on the inner surface of the box-shaped structure of the air guide cover; one side of the bottom plate is rotatably connected to the bottom plate through a pin shaft, and the other side is fixed to the bottom plate through a bolt.

[0018] In a preferred embodiment of the present invention, the third mounting partition includes a vertical plate parallel to the second side plate and two side flat plates provided on both sides of the vertical plate and perpendicular to the second side plate. At the upper end of the vertical plate, an L-shaped bent plate is formed by bending away from the second side plate. The first bent plate of the L-shaped bent plate is perpendicular to the second side plate, and its second bent plate is parallel to the second side plate; a plurality of first wire passing holes are opened in the second bent plate, a first opening is opened at the lower end of the vertical plate corresponding to the second side plate, and a first side door plate is hermetically provided at the first opening. A plurality of second wire passing holes communicating with the fourth clean room are opened on the second side plate above the first opening, and a third wire passing hole communicating with the fourth clean room is also opened on the second side plate.

[0019] In a preferred embodiment of the present invention, a guide rail member is respectively fixed to the upper parts of the second dirty room and the third dirty room. Each guide rail member includes a U-shaped bottom frame with an opening facing the second side plate. Two outer edges of the two side edges of the U-shaped bottom frame respectively extend upward to form two fixed edges, and an inner edge of the bottom edge of the U-shaped bottom frame extends downward to form an installation edge; at least two installation holes are provided on the installation edge, and welding nuts are respectively provided at the corresponding installation holes. A long circular hole is respectively opened at a position close to the second side plate on the two side edges of the U-shaped bottom frame; second openings and third openings are respectively opened on the second side plate corresponding to the upper parts of the second dirty room and the third dirty room, and a second side door plate and a third side door plate are respectively provided at the second opening and the third opening.

[0020] In a preferred embodiment of the present invention, a first chamber, a second chamber, and a third chamber arranged side by side are sequentially provided along the width direction of the bottom plate in the first clean room. A partitioned back plate is provided between each chamber; a plurality of first partition plates and a plurality of third partition plates perpendicular to the back plate are respectively arranged at intervals in the first chamber and the third chamber. The plurality of first partition plates and the plurality of third partition plates respectively divide the first chamber and the third chamber into a plurality of first sub-chambers and a plurality of third sub-chambers.

[0021] In a preferred embodiment of the present invention, a fourth opening and a fifth opening are respectively opened on the first side plate corresponding to the second chamber and the third chamber, and a fourth side door plate and a fifth side door plate are hermetically provided at the fourth opening and the fifth opening; a plurality of fifth installation openings are opened on the bottom plate corresponding to the second chamber, and a fifth bottom door plate is hermetically provided at the fifth installation openings.

[0022] In a preferred embodiment of the present invention, the top frame includes two longitudinal beams arranged in parallel at intervals and a plurality of cross beams horizontally fixed between the two longitudinal beams. The tops of the first side plate, the middle partition plate and the second side plate are respectively fixed to the corresponding cross beams. A top plate is hermetically covered on the top of the top frame. Door structures are hermetically provided on both sides of the boxes corresponding to the first sub-chamber, the third sub-chamber, the second clean room and the third clean room respectively.

[0023] In a preferred embodiment of the present invention, the materials of the bottom plate, the top frame, the first side plate, the second side plate, the middle partition plate, the first mounting partition plate, the second mounting partition plate, the third mounting partition plate, the wind shield, the back plate, the first partition plate and the third partition plate are all low alloy steel or stainless steel.

[0024] The present invention also provides a box with a cooling unit, which includes: the box for the converter of the EMU power unit described above and the cooling unit; the cooling unit includes a cooling water pump and a cooling pipeline. The cooling water pump is arranged in the first dirty room and the third dirty room, and the cooling pipeline extends from the first dirty room and the third dirty room to the first clean room respectively. The cooling water pump is connected to the cooling pipeline through a transition pipeline, and a metal joint is provided between the transition pipeline and the cooling pipeline.

[0025] In a preferred embodiment of the present invention, the metal joint includes a male joint and a female joint. An annular protrusion extends axially along the inner ring of the end face of the male joint. An annular groove is formed on the outer ring of the end face of the male joint, and a sealing ring is sleeved in the annular groove. An insertion ring groove is provided on the inner ring of the end face of the female joint. The annular protrusion is inserted into the insertion groove, and the outer ring of the end face of the male joint closely adheres to the outer ring of the end face of the female joint. A locking clamp is sleeved on the outer edges of the end faces of the male joint and the female joint.

[0026] In a preferred embodiment of the present invention, the locking clamp includes an annular clamping sleeve with a notch. An annular clamping groove is provided on the inner side of the annular clamping sleeve. The outer edges of the end faces of the male joint and the female joint are clamped in the annular clamping groove. Screws and mounting blocks with through holes are respectively fixed at both ends of the notch of the annular clamping sleeve. The end of the screw passes through the through hole on the mounting block and is threadedly connected to a nut on the other side of the mounting block.

[0027] In a preferred embodiment of the present invention, the materials of the cooling pipeline, the transition pipeline and the locking clamp are all aluminum alloy, low alloy steel or stainless steel, and the material of the sealing ring is low temperature resistant rubber.

[0028] As described above, in the present invention, the entire box body is divided into a first clean room and a dirty room. A second clean room and a third clean room are partitioned in the dirty room, which expands the space for installing various devices in the first clean room. A fourth clean room is also partitioned in the dirty room to facilitate the connection of cable lines and power supply lines. At the same time, the main body of the dirty room is divided into a first dirty room, a second dirty room, and a third dirty room, making the layout of the dirty room more compact and more space-saving. Without changing the external dimensions of the box body, the space utilization rate is greatly improved. Furthermore, under the condition that the total installation space of the box body remains unchanged, more devices can be installed without affecting the installation and maintenance of the devices inside the power unit converter, so as to ensure that the installation and use requirements can still be met when the volume of the box body is limited while the quantity and volume of various devices increase significantly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following drawings are only intended to illustrate and explain the present invention schematically and do not limit the scope of the present invention.

[0030] Wherein:

[0031] Figure 1 : is a schematic structural view of the box body for the power unit converter of the EMU provided by the present invention Figure 1 .

[0032] Figure 2 : is a schematic structural view of the box body for the power unit converter of the EMU provided by the present invention Figure 2 .

[0033] Figure 3 : is a schematic structural view of the bottom plate and the air guide cover provided by the present invention Figure 1 .

[0034] Figure 4 : is a schematic structural view of the bottom plate and the air guide cover provided by the present invention Figure 2 .

[0035] Figure 5 : is a schematic structural view of the bottom plate and the air guide cover provided by the present invention Figure 3 .

[0036] Figure 6 : is a schematic diagram of the cooling air flow direction when the cooling air blows to the air guide cover and the reactor provided by the present invention. Among them, Figure 6 the arrow in represents the cooling air flow direction, and the dotted box above the air guide cover represents the reactor, Figure 6 the bottom plate and the air guide cover in are sectional views.

[0037] Figure 7 : is a schematic structural view of the third installation partition provided by the present invention Figure 1 .

[0038] Figure 8 : is a schematic structural view of the third installation partition provided by the present inventionFigure 2 .

[0039] Figure 9 : It is a schematic structural diagram of the guide rail provided by the present invention.

[0040] Figure 10 : It is a schematic structure of the cooperation between the guide rail provided by the present invention and the chopping resistor Figure 1 .

[0041] Figure 11 : It is a schematic structure of the cooperation between the guide rail provided by the present invention and the chopping resistor Figure 2 , Figure 11 The arrow in it represents the pulling direction of the chopping resistor.

[0042] Figure 12 : It is a schematic structural diagram of the guide rail and the chopping resistor after being fixed in the present invention.

[0043] Figure 13 : It is a schematic structure of the cooperation between the male connector, female connector and the clamp provided by the present invention Figure 1 .

[0044] Figure 14 : It is a schematic structure of the cooperation between the male connector, female connector and the clamp provided by the present invention Figure 2

[0045] Figure 15 : It is a partial cross-sectional view of the male connector, female connector and the clamp after being fastened in the present invention.

[0046] Explanation of the reference numerals in the drawings:

[0047] 1. Top frame; 11. Load-bearing beam; 12. Hanging seat;

[0048] 2. Bottom plate; 21. First mounting opening; 22. Second mounting opening; 23. Third mounting opening; 24. Fourth mounting opening; 25. Fifth mounting opening;

[0049] 3. First side plate; 31. Fourth opening; 32. Fifth opening;

[0050] 4. Second side plate; 41. First opening; 42. Second wire-passing hole; 43. Second opening; 44. Third opening; 45. Third wire-passing hole;

[0051] 5. Intermediate partition;

[0052] 6. First clean room; 61. Back panel; 62. First chamber; 621. First partition board; 63. Second chamber; 64. Third chamber; 641. Third partition board;

[0053] 7. Composite dirty chamber; 71. Second clean chamber; 711. First installation partition; 72. Third clean chamber; 721. Second installation partition; 73. Third installation partition; 731. Fourth clean chamber; 732. Vertical plate; 7321. First bending plate; 7322. Second bending plate; 73221. First wire passing hole; 733. Side flat plate; 74. Windshield; 75. Fan partition; 76. First dirty chamber; 77. Second dirty chamber; 771. Reactor installation chamber; 772. First fan chamber; 773. Second fan chamber; 78. Third dirty chamber; 79. Guide rail part; 791. U-shaped chassis; 792. Fixed side; 7921. Long circular hole; 793. Installation side; 7931. Welding nut; 7932. Non-loosening bolt;

[0054] 8. Bottom plate; 81. Air guide cover; 811. Flat straight surface; 812. Air guiding surface; 813. Wind shielding surface;

[0055] 91. Chopper resistor;

[0056] 92. Male connector; 921. Annular protrusion; 922. Annular groove; 923. Sealing ring;

[0057] 93. Female connector; 931. Insertion ring groove;

[0058] 94. Locking clamp; 941. Annular sleeve; 9411. Annular card slot; 942. Screw rod; 943. Installation block. Detailed implementation manners

[0059] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0060] As Figure 1 and Figure 2 shown, this embodiment provides a box body for a converter of a motor car unit, and the box body is in a rectangular shape and is installed under the motor car body. Among them, the box body includes a top frame 1 and a bottom plate 2 that are horizontally arranged at intervals up and down. First side plates 3 and second side plates 4 that are vertically arranged are respectively fixed at both ends in the length direction of the bottom plate 2. An intermediate partition 5 is fixedly arranged between the first side plate 3 and the second side plate 4 along the width direction of the bottom plate 2. The tops of the first side plate 3, the second side plate 4, and the intermediate partition 5 are fixedly connected to the top frame 1. A first clean chamber 6 is formed between the intermediate partition 5 and the first side plate 3, and a composite dirty chamber 7 is formed between the intermediate partition 5 and the second side plate 4.

[0061] At the corner positions near one end of the intermediate partition 5 and on both sides in the width direction of the composite dirty chamber 7, a first mounting partition 711 and a second mounting partition 721 are respectively provided. At the exact middle of the composite dirty chamber 7 near the second side plate 4, a third mounting partition 73 is provided. The cross-sections of the first mounting partition 711 and the second mounting partition 721 are L-shaped. The first mounting partition 711, the second mounting partition 721, and the third mounting partition 73 divide the composite dirty chamber 7 into an independent second clean chamber 71, a third clean chamber 72, a fourth clean chamber 731, and the main body of the dirty chamber. At the positions near both sides in the width direction of the main body of the dirty chamber, two windshields 74 with air inlet through holes are symmetrically provided. One end of each of the two windshields 74 is fixed to the first mounting partition 711 and the second mounting partition 721 respectively, and the other end is fixed to the second side plate 4. The two windshields 74 divide the main body of the dirty chamber into a first dirty chamber 76 near the second clean chamber 71, a second dirty chamber 77 in the middle, and a third dirty chamber 78 near the third clean chamber 72.

[0062] The part of the second dirty chamber 77 between the first dirty chamber 76 and the third dirty chamber 78 forms a fan installation chamber, and the part of the second dirty chamber 77 between the second clean chamber 71 and the third clean chamber 72 forms a reactor installation chamber 771. On the bottom plate 2, a first installation opening 21 and a second installation opening 22 are respectively provided corresponding to the part of the fan installation chamber and the part of the reactor installation chamber 771. A first bottom door plate and a second bottom door plate are respectively provided at the first installation opening 21 and the second installation opening 22, and a plurality of air outlet holes are provided on the second bottom door plate.

[0063] Specifically, the length direction of the box body is consistent with the longitudinal extension direction of the EMU car body. Generally, the upper and lower ends of the first side plate 3, the second side plate 4, and the intermediate partition 5 are respectively welded to the top frame 1 and the bottom plate 2. Both the first mounting partition 711 and the second mounting partition 721 are welded to the top frame 1, the bottom plate 2, and the intermediate partition 5. One surface of the first mounting partition 711 is arranged parallel to the intermediate partition 5, and the other surface is arranged perpendicular to the intermediate partition 5. The two surfaces of the first mounting partition 711 and the intermediate partition 5 enclose a second clean chamber 71 with an opening facing one side of the box body. One surface of the second mounting partition 721 is arranged parallel to the intermediate partition 5, and the other surface is arranged perpendicular to the intermediate partition 5. The two surfaces of the second mounting partition 721 and the intermediate partition 5 enclose a third clean chamber 72 with an opening facing the other side of the box body. Clear sealing requirements are imposed on the first clean chamber 6, the second clean chamber 71, the third clean chamber 72, and the fourth clean chamber 731, and generally no clear sealing requirements are imposed on the main body of the dirty chamber.

[0064] In use, the top of the box body is suspended at the bottom of the EMU car body in a hanging manner. The first clean room 6, the second clean room 71, and the third clean room 72 are used to install various components of the traction converter, some components of the auxiliary converter, and the five-level contactor for realizing multi-mode power supply. The fourth clean room 731 is used to place the cable wires output by the auxiliary output contactor in the auxiliary converter, as well as the power supply wires of the cooling water pump and the cooling fan. The connection between this cable wire and the cable wire connected by the vehicle factory can be realized inside the fourth clean room 731, and the connection between the plug and the socket provided by the vehicle factory can be realized outside the fourth clean room 731. Both the first dirty room 76 and the third dirty room 78 are used to install the cooling water pump in the cooling unit. The spaces on both sides of the box body near the first dirty room 76 and the third dirty room 78 are used to install the radiator in the cooling unit. The fan installation room is used to install the cooling fan in the cooling unit, and the reactor installation room 771 is used to install the reactor in the auxiliary converter. The specific quantity of each component is determined according to the functions to be realized, and the present invention does not limit this.

[0065] The components in the entire dirty room body are mainly cooled by forced air cooling. The above-mentioned cooling fan is preferably a centrifugal fan. The two sides of the box body corresponding to the first dirty room 76 and the third dirty room 78 form air inlets. During operation, the cooling fan forms a negative pressure in the air duct, and the cooling air is sucked into the radiator from the air inlets on both sides of the box body. After passing through the radiator, it is sucked into the cooling fan through the air inlet through holes on the wind deflector 74, and then blown to the reactor to cool it.

[0066] Therefore, in this embodiment, the entire box body is divided into the first clean room 6 and the composite dirty room 7. The second clean room 71 and the third clean room 72 are divided in the composite dirty room 7, which expands the space for installing components in the first clean room 6. The fourth clean room 731 is also divided in the composite dirty room 7 to facilitate the connection of cable wires and power supply wires. At the same time, the dirty room body is divided into the first dirty room 76, the second dirty room 77, and the third dirty room 78, making the layout of the composite dirty room 7 more compact and more space-saving. Without changing the external dimensions of the box body, the space utilization rate is greatly improved. Furthermore, without changing the total installation space of the box body, more components can be installed, and it does not affect the installation and maintenance of the components inside the power unit converter, so as to ensure that the installation and use requirements can still be met when the volume of the box body is limited while the quantity and volume of each component increase significantly.

[0067] In a specific implementation manner, in order to prevent the cooling fan from failing to work due to a fault and affecting air-cooled heat dissipation, as Figure 1 shown, a fan partition board 75 is provided in the fan installation room along the width direction of the box body to divide this area into independent first fan room 772 and second fan room 773. The second fan room 773 is close to the third installation partition board 73. A plurality of air outlet holes are opened on the part of the first bottom door panel corresponding to the second fan room 773.

[0068] Among them, the first fan chamber 772 and the second fan chamber 773 are respectively used to install two centrifugal fans, and the two centrifugal fans in each fan chamber are arranged side by side along the width direction of the box body, and their air inlets are respectively oriented towards the first dirty chamber 76 and the third dirty chamber 78 to ensure the air-cooling effect. The first fan chamber 772 and the second fan chamber 773 are separated by a fan partition 75, mainly to prevent the air sucked by the cooling fan in the first fan chamber 772 from interfering with the air sucked by the cooling fan in the second fan chamber 773 to generate turbulence and affect the air-cooling effect. Generally, the fan partition 75 is welded and fixed to the following top plate and sealed and fixed to the first bottom door panel to ensure that the air between the cooling fans in the first fan chamber 772 and the second fan chamber 773 will not communicate with each other to ensure the heat dissipation effect.

[0069] Of course, when space permits, multiple fan partitions 75 can also be set as needed, and two centrifugal fans are respectively placed in each divided fan chamber. The bottom of the fan chamber close to the reactor installation chamber 771 is closed, and air outlet holes are opened at the bottoms of the remaining fan chambers to improve the heat dissipation effect.

[0070] In this embodiment, the radiators, reactors and the following chopper resistors 91 installed in the dirty chamber main body are the main air-cooled components, and the power modules and transformers in the first clean chamber 6 are the main water-cooled components. The cooling water pump sends the coolant to the power modules and transformers in the first clean chamber 6 for water cooling. The coolant flowing through the above components returns to the radiator and is cooled by the cooling air and then flows back to the cooling water pump, thus forming a water cycle.

[0071] In this way, the cooling air is sucked in from the air inlets on both sides of the box body, flows through the radiator and is respectively sucked by the cooling fans in the first fan chamber 772 and the second fan chamber 773. The air sucked into the first fan chamber 772 is blown by the cooling fan towards the reactor for cooling, and finally discharged from the air outlet holes on the second bottom door panel; the air sucked into the second fan chamber 773 is directly discharged from the air outlet holes on the first bottom door panel through the cooling fan. The heat dissipation channels formed by the air outlet holes on the first fan chamber 772 and the second bottom door panel mainly play a role in dissipating heat from the radiator and the reactor, and the heat dissipation channels formed by the second fan chamber 773 and the air outlet holes on the first bottom door panel mainly play a role in dissipating heat from the radiator. The two cooperate with each other, greatly improving the heat dissipation effect, and even if the motor of one of the cooling fans is damaged, it can still ensure the normal heat dissipation function, ensure that each device can work normally, and ensure the normal operation of the EMU.

[0072] In actual application, in order to ensure that the air of the cooling fan in the first fan chamber 772 can effectively blow towards the reactor, such as Figure 3 、 Figure 4 and Figure 5As shown in the figure, the second bottom door panel includes a bottom plate 8 and at least one air guide cover 81 fixed on the upper surface of the bottom plate 8. Each air guide cover 81 includes a box-shaped structure formed by at least one top surface and three inclined side surfaces with an opening on one side. The opening end faces the middle partition 5. Its top surface is parallel to the bottom plate 8, and the internal angles between its three inclined side surfaces and the top surface are all obtuse angles. A plurality of air outlet holes are opened in the inner cavity area of the bottom plate 8 corresponding to each box-shaped structure.

[0073] In this way, the inclined side surface opposite to the opening end forms a wind guiding surface 812, the two inclined side surfaces on both sides form wind blocking surfaces 813, and the top surface forms a flat surface 811. During operation, the flow direction of the cooling air is as Figure 6 shown. Before the cooling air blown by the cooling fan in the first fan chamber 772 reaches the reactor, the cooling air will be forced to be lifted by the wind guiding surface 812 of the air guide cover 81, so as to ensure that as much cooling air as possible is blown towards the reactor; the flat surface 811 is completely located directly below the reactor, which can ensure that the cooling air can stably pass through the entire reactor; the setting of the two wind blocking surfaces 813 can prevent the cooling air from slipping away from the air outlet holes directly below the air guide cover 81 before completely passing through the reactor, so that the cooling air is blown towards the reactor as much as possible. At the same time, the setting of the wind blocking surfaces 813 also plays a supporting role. After the cooling air passes through the entire reactor, due to the blocking effect of the middle partition 5, the first installation partition 711 and the second installation partition 721, the cooling air will be forced to blow towards the opening end of the air guide cover 81, and finally enter the inner cavity area of the box-shaped structure and be discharged through the air outlet holes on the bottom plate 8.

[0074] Therefore, through the mutual cooperation of the wind guiding surface 812, the wind blocking surface 813 and the flat surface 811 of the air guide cover 81, the cooling air can be forced to flow to the reactor, pass through the reactor and then be discharged from the air outlet holes on the bottom plate 8, avoiding the situation that the cooling air directly discharges from the air outlet holes without passing through the reactor, effectively ensuring that the cooling air can be blown towards the reactor and ensuring the cooling effect on the reactor. At the same time, the cooling air rotates 180° after passing through the reactor and then is discharged from the air outlet holes at the lower part of the air guide cover 81. In this way, there is no need to set an air outlet outside the box body, which can reduce the external dimension of the box body, facilitate the installation and maintenance of each device in the box body on the EMU car body, and also play a role in streamlining the structure and reducing structural redundancy.

[0075] It should be noted that during installation, the lower surface of the reactor should be as close as possible to the top surface of the air guide cover 81 to ensure the heat dissipation effect. The number of air guide covers 81 is determined according to the number of specific types of reactors in the reactor. For example, in this embodiment, two air guide covers 81 are provided on the bottom plate 8 in total. At the same time, the shape of the air guide cover 81 can be adjusted according to the size and height of the corresponding type of reactor. For example, in this embodiment, as Figure 3As shown, the air guiding surface 812 of one of the air guiding covers 81 extends vertically upward near the side of the middle partition plate 5 to form a vertical surface, which is connected to the top surface.

[0076] Furthermore, in order to reduce aerodynamic noise, increase the natural frequency of the air guiding cover 81, and reduce vibration noise, sound-absorbing cotton (not shown in the figure) is provided on the inner surface of the box-shaped structure of the air guiding cover 81.

[0077] In addition, in order to facilitate the maintenance of the reactor, one side of the above-mentioned bottom plate 8 is rotatably connected to the bottom plate 2 through a pin shaft, and the other side is fixed to the bottom plate 2 through bolts. In this way, when the reactor needs to be maintained, the bolts on one side of the bottom plate 8 are removed, and then the bottom plate 8 is rotated to open the first installation opening 21, which is simple and convenient.

[0078] In practical applications, for the convenience of maintenance, third installation openings 23 and fourth installation openings 24 are respectively provided on the bottom plate 2 corresponding to parts of the first dirty chamber 76 and the third dirty chamber 78, and a third bottom door panel and a fourth bottom door panel are respectively provided at the third installation opening 23 and the fourth installation opening 24.

[0079] In this way, for each device installed in the dirty chamber main body, when disassembling, assembling, and performing later maintenance, the radiator is operated from both sides of the box body, the cooling fan is operated from the first installation opening 21 at the bottom, the reactor is operated from the second installation opening 22 at the bottom, the cooling water pump is operated from the third installation opening 23 and the fourth installation opening 24 at the bottom, and the chopping resistor 91 is pulled out and operated from the second opening 43 and the third opening 44 on the side, making the disassembly, assembly, and later maintenance work more convenient.

[0080] In the specific implementation process, in order to make the structure more compact and at the same time leave a larger space for the installation of the cooling fan, as Figure 2 、 Figure 7 and Figure 8 shown, the third installation partition plate 73 includes a vertical plate 732 parallel to the second side plate 4 and two side flat plates 733 provided on both sides of the vertical plate 732 and perpendicular to the second side plate 4. At the upper end of the vertical plate 732, it is bent away from the second side plate 4 to form an L-shaped bent plate. The first bent plate 7321 of the L-shaped bent plate is perpendicular to the second side plate 4, and its second bent plate 7322 is parallel to the second side plate 4. A plurality of first wire passing holes 73221 are provided on the second bent plate 7322. A first opening 41 is provided on the second side plate 4 corresponding to the lower end of the vertical plate 732, and a first side door panel is hermetically provided at the first opening 41. A plurality of second wire passing holes 42 communicating with the fourth clean chamber 731 are provided on the second side plate 4 above the first opening 41, and a third wire passing hole 45 communicating with the fourth clean chamber 731 is also provided on the second side plate 4.

[0081] Specifically, the vertical plate 732 and the two side flat plates 733 of the third installation partition 73 and the second side plate 4 enclose to form a fourth clean room 731. During installation, the top of the third installation partition 73 is fixed to the top plate described below, and its bottom is fixed to the bottom plate 2. To ensure the sealing performance of the fourth clean room 731, cable sealing plugs are provided on both the first wire-passing hole 73221 and the second wire-passing hole 42, which can be hermetically connected to the corresponding wire-passing holes and allow cable wires to pass through. The specific structure is prior art and will not be elaborated here. In addition, for the convenience of later maintenance, an installation opening is generally provided at the lower end of the vertical plate 732, and a door structure is sealed at the installation opening. During use, the cable wire for assisting the output contactor to output passes through the first wire-passing hole 73221, and the cable wire connected by the vehicle factory (provided on the EMU car body) passes through the second wire-passing hole 42. The wiring parts of the two are connected in the upper space of the fourth clean room 731. After the two are connected, the power unit converter can supply power to the electrical equipment on the car body.

[0082] When making the connection, a person reaches in through the first opening 41 and extends upward into the upper space of the fourth clean room 731 (i.e., the part of the fourth clean room 731 corresponding to the L-shaped bent plate), and the two cable wires can be connected together using a wrench. Since the operation space of the human hand is mainly concentrated in the upper space of the fourth clean room 731, only the lower space needs to be able to allow the human hand to reach in. Therefore, the third installation partition 73 is designed as a special-shaped structure that is convex upward and concave downward, which can not only meet the space requirements for the human hand to connect the cable wires but also minimize the space of the fourth clean room 731. In this way, the fan mounting bracket for installing the fan can be arranged directly below the first bent plate 7321 of the L-shaped bent plate, expanding enough space for the installation of the fan and making the structure more compact. After the cable wires are connected, the first side door panel can be installed and sealed with a sealing strip, and the first side door panel can be opened when maintenance is needed later.

[0083] The third wire-passing hole 45 is mainly used to install plugs for supplying power to the cooling water pump and the cooling fan. Generally, two groups of third wire-passing holes 45 are provided, and plugs with self-contained sealing rings (prior art) are provided on each group of third wire-passing holes 45 to ensure the sealing performance of the fourth clean room 731. The plugs are exposed outside the second side plate 4. During installation, generally, the power supply wires of the cooling fan and the cooling water pump are first passed through the first wire-passing hole 73221, passed through the fourth clean room 731, and then passed out through the third wire-passing hole 45, and connected to the plugs placed outside the second side plate 4. After connection, the plugs are placed corresponding to the third wire-passing holes 45 and then fixed to the second side plate 4. During use, the socket provided by the vehicle factory (provided on the EMU car body) is directly plugged into the corresponding plug, and the EMU car body can supply power to the cooling water pump and the cooling fan. Moreover, the operation space is located outside the box body and does not occupy the internal working space of the box body.

[0084] In addition, due to the sealing requirements of the fourth clean room 731, it should avoid the positions of the air inlet and the air outlet as much as possible. Considering the positions of the air inlet and the air outlet in this embodiment, in this embodiment, the third mounting partition 73 is arranged in the middle of the composite dirty room 7 and close to the second side plate 4.

[0085] Furthermore, in order to save space and make the structure more compact in this embodiment, a cooling water pump is installed directly below the chopping resistor 91, so that the chopping resistor 91 cannot be removed vertically as in the prior art during maintenance.

[0086] Therefore, in order to facilitate the installation and maintenance of the chopping resistor 91, as Figure 1 , Figure 2 and Figures 9 to 12 shown, a guide rail member 79 is respectively fixed on the upper parts of the second dirty room 77 and the third dirty room 78. Each guide rail member 79 includes a U-shaped bottom frame 791 with an opening facing the second side plate 4. Two fixing edges 792 are respectively formed by upward extension of the outer edges of the two side edges of the U-shaped bottom frame 791, and an installation edge 793 is formed by downward extension of the inner edge of the bottom edge of the U-shaped bottom frame 791. At least two installation holes are provided on the installation edge 793, and welding nuts 7931 are correspondingly provided at each installation hole. Long circular holes 7921 penetrating up and down are respectively formed on the two side edges of the U-shaped bottom frame 791 and close to the second side plate 4. Second openings 43 and third openings 44 are respectively formed on the second side plate 4 corresponding to the upper parts of the second dirty room 77 and the third dirty room 78, and a second side door panel and a third side door panel are respectively provided at the second openings 43 and the third openings 44.

[0087] Among them, the two fixing edges 792 are respectively welded to the corresponding windshields 74 and the mounting brackets on both sides of the box body for installing radiators. The two side edges of the chopping resistor 91 can slide along the two side edges of the U-shaped bottom plate 8. The long circular holes 7921 are formed on the two side edges of the U-shaped bottom frame 791 mainly to eliminate the installation difficulties caused by welding deformation during welding with the box body and ensure the smooth installation of bolts. Through holes corresponding to the long circular holes 7921 are formed on the two side edges of the chopping resistor 91, and through holes corresponding to the welding nuts 7931 are formed on the side surface of the chopping resistor 91 away from the second side plate 4. Generally, in order to prevent the bolts from falling into the box body during disassembly, as Figure 10 shown, the fastening bolts installed at the welding nuts 7931 are non-loosening bolts 7932 (prior art), and riveting nuts are provided at the through holes on the two side surfaces of the chopping resistor 91.

[0088] Taking the installation and removal of the chopping resistor 91 in the second dirty chamber 77 as an example, before installation, open the second side door panel, first screw the non-removable bolt 7932 into the rivet nut. After the thread has completely passed through the rivet nut, make the smooth rod part of the non-removable bolt 7932 be located within the area of the rivet nut. Then lap the two sides of the chopping resistor 91 on the two sides of the U-shaped chassis 791. After pushing it in place inward, use a torque wrench with an extension rod to continue tightening the non-removable bolt 7932 along the longitudinal direction of the vehicle body, so that it is screwed into the welding nut 7931 to achieve fastening. After that, fasten the long circular hole 7921 and the corresponding through hole on the side of the chopping resistor 91 with bolts to complete the installation. After the installation is completed, install the second side door panel. When the chopping resistor 91 needs to be repaired, first open the second side door panel, remove the bolt at the long circular hole 7921, and then use a torque wrench with an extension rod to loosen the non-removable bolt 7932 to ensure that its threaded part completely withdraws from the welding nut 7931. At this time, the chopping resistor 91 can be pulled out by drawing.

[0089] Install the non-removable bolt 7932 at the welding nut 7931. When installing the chopping resistor 91, this bolt can reach the fastening point safely and reliably along with the chopping resistor 91. When removing the chopping resistor 91, this bolt can also be taken out safely and reliably, avoiding the bolt falling into the interior of the box during operation, causing potential safety hazards, and the operation process can be completed outside the box without the operator entering the interior of the box, which is simple to operate.

[0090] In this way, the installation and removal of the chopping resistor 91 can be achieved by drawing through the second opening 43 and the third opening 44 on the second side plate 4. Without affecting the installation and maintenance of the chopping resistor 91, the operation is more convenient while ensuring the compact layout of the main body of the dirty chamber.

[0091] Furthermore, to make the structure of the first clean chamber 6 more compact, as Figure 1 shown, along the width direction of the bottom plate 2 in the first clean chamber 6, the first chamber 62, the second chamber 63 and the third chamber 64 are arranged side by side in sequence, and a separated back plate 61 is provided between each chamber. In the first chamber 62 and the third chamber 64, a plurality of first partition plates 621 and a plurality of third partition plates 641 perpendicular to the back plate 61 are respectively arranged at intervals. The plurality of first partition plates 621 and the plurality of third partition plates 641 respectively divide the first chamber 62 and the third chamber 64 into a plurality of first sub-chambers and a plurality of third sub-chambers.

[0092] Among them, for the convenience of installation and wiring, multiple first sub-chambers and the second clean room 71 are used to install the traction control unit and traction power module in the traction converter, as well as the auxiliary power module, transformer and auxiliary output contactor in the auxiliary converter. Multiple third sub-chambers and the third clean room 72 are used to install the input contactor, traction power module, resonant capacitor and resistor module in the traction converter, as well as the auxiliary power module in the auxiliary current converter. The second chamber 63 is used to install the permanent magnet contactor, intermediate capacitor and resistor module, and five-stage contactor in the traction converter.

[0093] The number of the first sub-chambers and the third sub-chambers is determined according to the actual number of devices. For example, in this embodiment, there are three first sub-chambers and three third sub-chambers. During use, for the convenience of installation and wiring, the three first sub-chambers are sequentially used to install the traction control unit, traction power module, auxiliary power module and transformer along the direction of the first side plate 3 towards the middle partition 5. The second clean room 71 is used to install the auxiliary output contactor. The three third sub-chambers are sequentially used to install the input contactor and resistor module, traction power module and auxiliary power module along the direction of the first side plate 3 towards the middle partition 5. The third clean room 72 is used to install the resonant capacitor. By dividing the first chamber 62 into regions, the structure is made more compact and the assembly efficiency is improved at the same time.

[0094] It should be noted that in this embodiment, in order to meet the requirement of lightweight, the auxiliary converter adopts the intermediate frequency auxiliary technology. Compared with the previous power frequency auxiliary technology, the devices are much lighter. In this embodiment, the auxiliary converter adopts the intermediate frequency auxiliary technology, and its transformer is relatively small and very light. Therefore, the transformer in this embodiment can be cooled by water cooling, so it is placed in the first clean room 6 to make the structure more compact and save more space.

[0095] In practical applications, for the convenience of installation and maintenance of the devices in the first chamber 62, the fourth opening 31 and the fifth opening 32 are respectively opened on the part of the first side plate 3 corresponding to the second chamber 63 and the third chamber 64, and the fourth side door plate and the fifth side door plate are hermetically arranged at the fourth opening 31 and the fifth opening 32 respectively. A plurality of fifth installation openings 25 are opened on the part of the bottom plate 2 corresponding to the second chamber 63, and the fifth bottom door plate is hermetically arranged at the fifth installation openings 25.

[0096] In this way, the components in the first chamber 62, the third chamber 64, the second clean chamber 71 and the third clean chamber 72 can be disassembled and assembled from both sides of the box body, the components in the second chamber 63 can be disassembled and assembled from the bottom, the components in the second chamber 63 near the first side plate 3 can also be disassembled and assembled through the fourth opening 31, and the third sub-chamber in the third chamber 64 near the first side plate 3 can also be disassembled and assembled through the fifth opening 32, making the disassembly and assembly of each component more convenient. During actual use, in order to make the disassembly and assembly of each power module more convenient, generally a drawer guide rail (which is a prior art) is arranged in the chamber for placing the power module, so as to realize the installation and maintenance of each power module by pulling, and the operation is more simple and convenient.

[0097] Further, as Figure 1 shown, the top frame 1 includes two longitudinal beams arranged in parallel at intervals and multiple cross beams transversely fixed between the two longitudinal beams. The tops of the first side plate 3, the middle partition 5 and the second side plate 4 are respectively fixed to the corresponding cross beams. In order to ensure the sealing of each clean chamber and better protect the entire box body, a top plate is hermetically covered on the top of the top frame 1, and a door structure is hermetically arranged on each side of the box body corresponding to the first sub-chamber, the third sub-chamber, the second clean chamber 71 and the third clean chamber 72. The two sides of the box body corresponding to the first dirty chamber 76 and the third dirty chamber 78 are open to ensure smooth air intake.

[0098] In addition, in order to increase the strength and stability of the box body, generally multiple load-bearing beams 11 are arranged at the part of the top frame 1 corresponding to the reactor installation chamber 771. In order to facilitate the box body to be suspended under the bottom of the EMU car body in a hanging manner, multiple hanging seats 12 extending outward are arranged in the circumferential direction of the top frame 1. In this embodiment, the hanging seat 12 adopts a hanging shaft, and a shock-absorbing pad is sleeved on the hanging shaft during installation and then connected to the bottom of the car body. Of course, other forms of hanging seats 12 can also be adopted according to needs, and this embodiment is only for illustration.

[0099] Further, in order to enable the entire box body to meet the storage and operation requirements at -50°C, the entire box body is made of low-temperature-resistant metal materials. In actual application, in order to reduce the weight as much as possible, the top plate, each side door panel, each bottom door panel, the bottom plate 8 and the air guide cover 81, these non-load-bearing components are all made of aluminum alloy material, which can not only reduce the weight but also be low-temperature-resistant. The materials of the above-mentioned bottom plate 2, top frame 1, first side plate 3, second side plate 4, middle partition 5, first installation partition 711, second installation partition 721, third installation partition 73, wind baffle 74, fan partition 75, back plate 61, first partition plate 621 and third partition plate 641 are all low-alloy steel or stainless steel, which can meet the strength requirements and be low-temperature-resistant.

[0100] Generally, the material of the guide rail member 79 is made of stainless steel to resist corrosion and low temperature. Since the metal outer surface of the chopping resistor 91 is generally not painted and can conduct electricity, when the guide rail member 79 made of stainless steel contacts the chopping resistor 91, the two can conduct electricity, and then after the box body is welded and the rest is painted, grounding can be achieved through the welded part of the box body and the set grounding part. For the cooling pipeline, it is generally made of stainless steel or aluminum alloy to ensure both corrosion resistance and low temperature resistance.

[0101] Furthermore, this embodiment also provides a box body with a cooling unit, including the box body for the converter of the EMU power unit and the cooling unit described above. The cooling unit includes a cooling water pump and a cooling pipeline. The cooling water pump is arranged in the first dirty chamber 76 and the third dirty chamber 78, and the cooling pipeline extends from the first dirty chamber 76 and the third dirty chamber 78 to the first clean chamber 6 respectively. The cooling water pump is connected to the cooling pipeline through a transition pipeline, and a metal joint is arranged between the transition pipeline and the cooling pipeline.

[0102] Specifically, the above-mentioned metal joint includes a male joint 92 and a female joint 93. As Figure 13 and Figure 14 shown, an annular protrusion 921 extends axially along the inner circle of the end face of the male joint 92. An annular groove 922 is formed on the outer circle of the end face of the male joint 92, and a sealing ring 923 is sleeved in the annular groove 922. The inner circle of the end face of the female joint 93 is provided with a plug-in annular groove 931. The annular protrusion is inserted into the plug-in annular groove 931 and the outer circle of the end face of the male joint 92 is closely attached to the outer circle of the end face of the female joint 93. A locking clamp 94 is sleeved on the outer edges of the end faces of the male joint 92 and the female joint 93.

[0103] The locking clamp 94 includes an annular clamping sleeve with a notch. An annular clamping groove 9411 is arranged on the inner side of the annular clamping sleeve. The outer edges of the end faces of the male joint 92 and the female joint 93 are clamped in the annular clamping groove 9411. Screws 942 and mounting blocks 943 with through holes are respectively fixed at both ends of the notch of the annular clamping sleeve. The end of the screw 942 passes through the through hole on the mounting block 943 and is threadedly connected with a nut on the other side of the mounting block 943.

[0104] The whole locking clamp 94 has a certain elasticity. During installation, after the annular protrusion 921 is inserted into the plug-in annular groove 931, the outer circle of the end face of the male joint 92 is closely attached to the outer circle of the end face of the female joint 93. At this time, the locking clamp 94 is sleeved on the outside, so that the outer edges of the end faces of the male joint 92 and the female joint 93 are clamped in the annular clamping groove 9411. Then the screw 942 is passed through the through hole on the mounting block 943 and tightened with a nut. Since the sealing ring 923 is pressed between the male joint 92 and the female joint 93, a sealing effect can be achieved through extrusion deformation. Generally, as Figure 15As shown in the figure, after the male connector 92 and the female connector 93 are inserted, their cross-sections are V-shaped. The cross-section of the annular sleeve 941 of the locking clamp 94 is also V-shaped. The V-shaped opening angles of the two are the same and fit together. After being locked by the locking clamp 94, the male connector 92 and the female connector 93 can be pressed tightly. The connected mechanical structure also has a labyrinth seal function, making the seal more reliable.

[0105] Of course, in actual use, the connection end of the cooling pipeline can be provided with the male connector 92 or the female connector 93, and the corresponding female connector 93 or male connector 92 is provided on the transition pipeline. The male connector 92 and the female connector 93 are generally integrally formed with the corresponding pipelines. One end of the cooling pipeline is connected to the cooling water pump through a transition pipeline, and the other end is connected to the radiator through a transition pipeline. Generally, when the transition pipeline is connected to the cooling water pump or the radiator, it can be directly connected or indirectly connected through a set of male connector 92 and female connector 93. In addition, in order to facilitate the bending of the pipeline, the transition pipeline is preferably made of a corrugated pipe.

[0106] In this way, a metal connection is formed between the transition pipeline and the cooling pipeline. Compared with the plug-in connection method of using a rubber pipe and a metal joint in the prior art, the connection reliability is greater, and there is basically no possibility of aging and loosening, and the seal is also more reliable. Moreover, each component can be made of low-temperature resistant materials. Specifically, the materials of the cooling pipeline, the transition pipeline and the locking clamp 94 are all aluminum alloy, low alloy steel or stainless steel, and the material of the sealing ring 923 is low-temperature resistant rubber, so that the cooling pipeline can be applicable to a low-temperature environment of -50°C and work reliably.

[0107] It should be noted that the above-mentioned traction control unit, traction power module, input contactor, resonant capacitor, intermediate capacitor, resistance module, permanent magnet contactor and chopper resistor 91 are all components of the traction converter, and the above-mentioned reactor, transformer, auxiliary power module and auxiliary output contactor are all components of the auxiliary converter. The above-mentioned radiator, cooling fan, cooling water pump and cooling pipeline are all components of the cooling unit. The specific structures of each component are all prior art and will not be elaborated here.

[0108] The above is only a schematic specific embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A box for a converter of a multiple unit power unit. The box is in a rectangular shape and is installed under the car body of the multiple unit. It is characterized in that the box includes a top frame and a bottom plate which are horizontally arranged at intervals. At both ends of the bottom plate in the length direction, a first side plate and a second side plate which are vertically arranged are respectively fixed. A middle partition is fixedly arranged between the first side plate and the second side plate along the width direction of the bottom plate. The tops of the first side plate, the second side plate and the middle partition are fixedly connected to the top frame. A first clean room is formed between the middle partition and the first side plate, and a composite dirty room is formed between the middle partition and the second side plate. In the composite dirty room, a first installation partition and a second installation partition are respectively arranged at the corner positions on both sides in the width direction near one end of the middle partition. A third installation partition is arranged in the middle near the second side plate of the composite dirty room. The cross sections of the first installation partition and the second installation partition are in an L shape. The third installation partition includes a vertical plate parallel to the second side plate and two side flat plates arranged on both sides of the vertical plate and perpendicular to the second side plate. At the upper end of the vertical plate, an L-shaped bending plate is bent away from the second side plate. The first bending plate of the L-shaped bending plate is perpendicular to the second side plate, and its second bending plate is parallel to the second side plate. The first installation partition, the second installation partition and the third installation partition divide the composite dirty room into independent second clean rooms, third clean rooms, fourth clean rooms and a main dirty room. The first clean room, the second clean room and the third clean room are used to install various devices of the traction converter, some devices of the auxiliary converter and a five-level contactor for realizing multi-system power supply. The fourth clean room is used to place the cable wires output by the auxiliary output contactor of the auxiliary converter and the power supply wires of the cooling water pump and the cooling fan. In the main dirty room, two windshields with air inlet through holes are symmetrically arranged at positions adjacent to both sides in the width direction. One ends of the two windshields are respectively fixed to the first installation partition and the second installation partition, and the other ends are both fixed to the second side plate. The two windshields divide the main dirty room into a first dirty room close to the second clean room, a second dirty room in the middle and a third dirty room close to the third clean room. Both the first dirty room and the third dirty room are used to install the cooling water pump in the cooling unit. The spaces on both sides of the box near the first dirty room and the third dirty room are used to install the radiators in the cooling unit. The part of the second dirty chamber between the first dirty chamber and the third dirty chamber constitutes a fan installation chamber, and the part of the second dirty chamber between the second clean chamber and the third clean chamber constitutes a reactor installation chamber; the fan installation chamber is used to install the cooling fan in the cooling unit, and the reactor installation chamber is used to install the reactor in the auxiliary converter; on the bottom plate, a first installation opening and a second installation opening are respectively provided corresponding to the part of the fan installation chamber and the part of the reactor installation chamber, and a first bottom door plate and a second bottom door plate are respectively provided at the first installation opening and the second installation opening; the second bottom door plate includes a bottom plate and at least one air guide cover fixed on the upper surface of the bottom plate, and each air guide cover includes a box-shaped structure surrounded by at least one top surface and three inclined side surfaces with one side open, the opening end of which faces the middle partition, the top surface of which is parallel to the bottom plate, and the internal angles between its three inclined side surfaces and the top surface are all obtuse angles; a plurality of air outlet holes are respectively provided in the inner cavity areas of the bottom plate corresponding to each box-shaped structure.

2. The box body for the converter of the EMU power unit according to claim 1, wherein a fan partition is provided in the fan installation chamber along the width direction of the box body to divide the fan installation chamber into an independent first fan chamber and a second fan chamber, and the second fan chamber is close to the third installation partition; a plurality of air outlet holes are provided in the part of the first bottom door plate corresponding to the second fan chamber.

3. The box body for the converter of the EMU power unit according to claim 1, wherein noise reduction cotton is provided on the inner surface of the box-shaped structure of the air guide cover; one side of the bottom plate is rotatably connected to the bottom plate through a pin shaft, and the other side is fixed to the bottom plate through a bolt.

4. The box body for the converter of the EMU power unit according to claim 1, wherein a plurality of first wire passing holes are provided in the second bent plate, a first opening is provided at the lower end of the vertical plate corresponding to the second side plate, and a first side door plate is hermetically provided at the first opening, a plurality of second wire passing holes communicating with the fourth clean chamber are provided on the second side plate and above the first opening, and a third wire passing hole communicating with the fourth clean chamber is further provided on the second side plate.

5. The box body for the converter of the EMU power unit according to claim 1, wherein a guide rail member is respectively fixed on the upper parts of the second dirty chamber and the third dirty chamber, and each guide rail member includes a U-shaped bottom frame with an opening facing the second side plate, two fixing edges respectively extend upward from the outer edges of the two side edges of the U-shaped bottom frame, and an installation edge extends downward from the inner edge of the bottom edge of the U-shaped bottom frame; at least two installation holes are provided on the installation edge, and welding nuts are respectively provided at the corresponding installation holes, and a long circular hole is respectively provided on the two side edges of the U-shaped bottom frame and close to the second side plate; a second opening and a third opening are respectively provided on the second side plate corresponding to the upper parts of the second dirty chamber and the third dirty chamber, and a second side door plate and a third side door plate are respectively provided at the second opening and the third opening.

6. The box body for the converter of the EMU power unit according to claim 1, wherein In the first clean room, a first chamber, a second chamber, and a third chamber are sequentially arranged side by side along the width direction of the bottom plate, and a partitioned back plate is provided between each chamber; In the first chamber and the third chamber, a plurality of first partition plates and a plurality of third partition plates perpendicular to the back plate are respectively arranged at intervals, and the plurality of first partition plates and the plurality of third partition plates divide the first chamber and the third chamber into a plurality of first sub-chambers and a plurality of third sub-chambers respectively.

7. The box body for the converter of the EMU power unit according to claim 6, wherein: On the first side plate, a fourth opening and a fifth opening are respectively opened corresponding to the second chamber and the third chamber, and a fourth side door plate and a fifth side door plate are respectively and hermetically provided at the fourth opening and the fifth opening; On the bottom plate, a plurality of fifth mounting openings are opened corresponding to the second chamber, and a fifth bottom door plate is hermetically provided at the fifth mounting openings.

8. The box body for the converter of the EMU power unit according to claim 6, wherein: The top frame includes two longitudinal beams arranged in parallel at intervals and a plurality of cross beams horizontally fixed between the two longitudinal beams. The tops of the first side plate, the middle partition plate, and the second side plate are respectively fixed to the corresponding cross beams; A top plate is hermetically covered on the top of the top frame, and a door structure is respectively and hermetically provided on both sides of the box body corresponding to the first sub-chamber, the third sub-chamber, the second clean room, and the third clean room.

9. The box body for the converter of the EMU power unit according to claim 6, wherein: The materials of the bottom plate, the top frame, the first side plate, the second side plate, the middle partition plate, the first mounting partition plate, the second mounting partition plate, the third mounting partition plate, the wind shield, the back plate, the first partition plate, and the third partition plate are all low alloy steel or stainless steel.

10. A box with a cooling unit, characterized in that, Comprising: The box body for the converter of the EMU power unit according to any one of claims 1-9 and a cooling unit; The cooling unit includes a cooling water pump and a cooling pipeline. The cooling water pump is arranged in the first dirty room and the third dirty room, and the cooling pipeline extends from the first dirty room and the third dirty room to the first clean room respectively; the cooling water pump is connected to the cooling pipeline through a transition pipeline, and a metal joint is arranged between the transition pipeline and the cooling pipeline.

11. The box body with a cooling unit according to claim 10, wherein: The metal joint includes a male joint and a female joint. An annular protrusion extends axially along the inner ring of the end face of the male joint. An annular groove is opened on the outer ring of the end face of the male joint, and a sealing ring is sleeved in the annular groove. An insertion ring groove is provided on the inner ring of the end face of the female joint. The annular protrusion is inserted into the insertion groove and the outer ring of the end face of the male joint closely abuts against the outer ring of the end face of the female joint; A locking clamp is sleeved on the outer edges of the end faces of the male joint and the female joint.

12. The box body with a cooling unit according to claim 11, wherein: The locking clamp includes an annular sleeve with a notch. An annular clamping groove is provided on the inner side of the annular sleeve. The outer edges of the end faces of the male joint and the female joint are clamped in the annular clamping groove; Screws and mounting blocks with through holes are respectively fixed at both ends of the notch of the annular sleeve. The end of the screw passes through the through hole on the mounting block and is threadedly connected to a nut on the other side of the mounting block.

13. The box body with a cooling unit according to claim 11, wherein the cooling pipeline, the transition pipeline and the locking clamp are all made of aluminum alloy, low alloy steel or stainless steel, and the sealing ring is made of low temperature resistant rubber.

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