Cooler for vehicle-mounted transformer and railway vehicle

Abstract

The invention provides a cooler used for a vehicle-mounted transformer and a railway vehicle, the cooler used for the vehicle-mounted transformer is characterized in that a cooler shell is connected with at least one cooling pipe unit, each cooling pipe unit comprises at least two cooling pipes which are sequentially arranged from inside to outside, and in each cooling pipe unit, the cooling pipes are connected with the cooling pipes; the cooling pipe located on the outer side is wound outside the cooling pipe which is adjacent to the cooling pipe located on the inner side, and the inner diameters of the cooling pipes of at least one cooling pipe unit are sequentially increased from inside to outside; at least part of the cooling pipe is located on the outer side of the cooler shell.

Description

Technical Field

[0001] The invention relates to a cooler for a vehicle-mounted transformer and a rail vehicle, belonging to the field of rail transportation. Background Art

[0002] The traction transformer for rail transit vehicles is installed on the train and is used to convert high voltage electricity (such as 25kV high voltage electricity of the contact network) into various low voltage electricity required by the traction system and auxiliary systems. It is the power source of the rail vehicle and the core and key component of the traction system.

[0003] In the existing cooler for transformer, the cooling tube unit includes a plurality of cooling tubes arranged in sequence from the inside to the outside. The innermost and outermost cooling tubes in the same cooling tube unit have the same inner diameter. Due to the large length difference between the outermost and innermost cooling tubes, the liquid resistances at the inlets of the cooling tubes in the same cooling tube unit are different, that is, the liquid resistance at the inlet of the outermost cooling tube is significantly greater than the liquid resistance of the innermost cooling tube, so that the coolant in the cooler cavity is more inclined to flow to the cooling tube located on the inner side with smaller liquid resistance, so that the coolant passing through the cooling tube near the outer side is significantly less than that of the cooling tube near the outer side, which affects the cooling efficiency of the coolant. Summary of the invention

[0004] The problem to be solved by the present invention is that in the cooler of the existing rail transit vehicle traction transformer, since the innermost and outermost cooling tubes in the same cooling tube unit have the same inner diameter, the amount of coolant passing through the cooling tube close to the outside is significantly less than that of the cooling tube close to the outside, thus affecting the cooling efficiency of the coolant. A cooler for a vehicle-mounted transformer is provided.

[0005] In order to solve the above technical problem, the technical solution adopted by the present invention is: a cooler for a vehicle-mounted transformer, wherein the cooler (10) shell is connected to at least one cooling pipe unit, each cooling pipe unit comprises at least two cooling pipes (101) arranged in sequence from the inside to the outside, and in each cooling pipe unit, the cooling pipe (101) located on the outside is arranged outside the adjacent cooling pipe (101) located on the inside, characterized in that: in each cooling pipe (101) of at least one cooling pipe unit, the inner diameter of each cooling pipe (101) increases in sequence from the inside to the outside; at least part of the cooling pipe (101) is located outside the cooler (10) shell.

[0006] When the length of the pipeline is longer, the fluid resistance is greater. Since the pipeline of the cooling pipe located on the outside of the same cooling pipe unit is longer than that of the cooling pipe located on the inside, the fluid resistance of the pipeline located on the outside is greater. The coolant in the same sub-cavity tends to flow to the cooling pipe on the inside with less resistance, resulting in uneven distribution of the coolant in each cooling pipe in the same cooling pipe unit. Through the above scheme of the present invention, the inner diameter of the cooling pipe located on the outside is made larger, thereby reducing the fluid resistance of the cooling pipe on the outside, making the distribution of the coolant in each cooling pipe in the same cooling pipe unit more balanced.

[0007] In the above technical solution, in the length direction of the vehicle (100), the first cooling pipe unit (U_1), the second cooling pipe unit, ..., the K2 cooling pipe unit are arranged in sequence in the first direction. K2 ≥ 2; K2 is an odd number or an even number; the first direction is any one of the length direction, width direction, and height direction of the cooler (10).

[0008] In a preferred technical solution, when the on-board transformer is installed on a vehicle, the first direction is parallel to the length direction of the vehicle (100).

[0009] In a preferred technical solution, the ua-th cooling tubes (101) of each cooling tube unit are correspondingly arranged in the first direction; When K2 is an odd number, at least a portion of the projection of the uath cooling tube (101) of the j1+1th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the j1th cooling tube unit on the second plane, 1≤j1≤[(K2+1) / 2]-1; at least a portion of the projection of the uath cooling tube (101) of the j2th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the j2+1th cooling tube unit on the second plane, (K2+1) / 2≤j2≤K2-1; wherein the second plane is a plane perpendicular to the first direction; When K2 is 2, at least a portion of the projection of the uath cooling tube (101) of the second cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the first cooling tube unit on the second plane; at least a portion of the projection of the uath cooling tube (101) of the first cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the second cooling tube unit on the second plane; When K2 is an even number greater than or equal to 4, at least a portion of the projection of the uath cooling tube (101) of the j3+1th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the j3th cooling tube unit on the second plane, 1≤j3≤(K2 / 2)-1; at least a portion of the projection of the uath cooling tube (101) of the j4th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the j4+1th cooling tube unit on the second plane, (K2 / 2)+1≤j4≤K2-1; Wherein, ua=1,2,...,UA; UA is the number of cooling pipes (101) in the cooling pipe unit, and UA≥2.

[0010] According to the above scheme of the present invention, for example, when K2 is an odd number, when looking from the 1st cooling tube to the K2th cooling tube along the first direction, from the 1st cooling tube unit to the correspondingly arranged (K2+1) / 2th cooling tube unit, at least a portion of the cooling tubes in the latter cooling tube unit will not be blocked by the previous corresponding cooling tube, so that the running wind can blow to the cooling tubes in the latter cooling tube unit. When looking from the K2th cooling tube to the correspondingly arranged 1st cooling tube along the first direction, from the K2th cooling tube unit to the (K2+1) / 2th cooling tube unit, at least a portion of the cooling tubes in the latter cooling tube unit will not be blocked by the previous corresponding cooling tube, so that the running wind can blow to the cooling tubes in the latter cooling tube unit. For the case where K2 is an even number, the principle is similar. Through the above arrangement, no matter which direction the vehicle is traveling, the air flow during the movement of the vehicle can flow from the cooling pipe unit located at the front in the direction of movement of the vehicle to the cooling pipe unit behind it, thereby avoiding the problem of the cooling pipe in front completely blocking the cooling pipe behind, so that the cooling pipes of each cooling pipe unit from the front to the middle in the direction of movement of the vehicle can all come into contact with the flowing air head-on, thereby achieving better heat dissipation and cooling effects.

[0011] In a more preferred technical solution: When K2 is an odd number, the projection of the uath cooling tube (101) of the j1+1th cooling tube unit on the second plane accommodates the projection of the uath cooling tube (101) of the j1th cooling tube unit on the second plane; the projection of the uath cooling tube (101) of the j2th cooling tube unit on the second plane accommodates the projection of the uath cooling tube (101) of the j2+1th cooling tube unit on the second plane; When K2 is an even number greater than or equal to 4, the projection of the ua th cooling tube (101) of the j3+1 th cooling tube unit on the second plane accommodates the projection of the ua th cooling tube (101) of the j3 th cooling tube unit on the second plane; the projection of the ua th cooling tube (101) of the j4 th cooling tube unit on the second plane accommodates the projection of the ua th cooling tube (101) of the j4+1 th cooling tube unit on the second plane.

[0012] According to the above scheme of the present invention, the cooling pipe in the rear cooling pipe unit will not be completely blocked by the corresponding cooling pipe in the front, thereby avoiding the problem of the front cooling pipe completely blocking the rear cooling pipe, so that the cooling pipes of each cooling pipe unit from the front to the middle in the direction of vehicle travel can come into contact with the flowing air head-on, achieving better heat dissipation and cooling effect.

[0013] In the preferred technical solution, K2≥4; When K2 is an odd number, the spacing between adjacent cooling tube units increases from the 1st cooling tube unit (U_1) to the (K2+1) / 2nd cooling tube unit, and decreases from the (K2+1) / 2nd cooling tube unit to the K2nd cooling tube unit. When K2 is 4, the spacing between the first cooling tube unit (U_1) and the second cooling tube unit, and the spacing between the third cooling tube unit and the fourth cooling tube unit are both smaller than the spacing between the second cooling tube unit and the third cooling tube unit; When K2 is an even number greater than or equal to 6, the spacing between adjacent cooling tube units increases from the 1st cooling tube unit (U_1) to the (K2 / 2)+1th cooling tube unit, and decreases from the K2 / 2th cooling tube unit to the K2th cooling tube unit.

[0014] During the research, the applicant found that the cooling tube unit located in the front in the direction of vehicle travel faces a higher wind speed, which makes the cooling effect better. Since the cooling tube unit in the front also blocks the air, the cooling tube unit located in the rear in the direction of vehicle travel faces a lower wind speed, which affects the cooling and heat dissipation effect of the cooling tube closer to the rear of the vehicle in the direction of travel. According to the above scheme of the present invention, when K2 is an odd number, when the first cooling tube unit is located at the front in the direction of vehicle travel, from the first cooling tube unit to the (K2+1) / 2 cooling tube unit, the spacing between the cooling tube units closer to the rear in the direction of vehicle travel is larger, so that the air resistance is smaller, and the larger spacing can take in more air entering from the side, making up for the problem of the reduced intermediate cooling wind speed, so that the cooling tube closer to the rear of the vehicle in the direction of travel can contact with more air entering from the side, ensuring the cooling effect. When the K2th cooling pipe unit is located at the front in the direction of vehicle travel, from the K2th cooling pipe unit to the (K2+1) / 2th cooling pipe unit, the spacing between the cooling pipe units closer to the rear in the direction of vehicle travel is larger, which also ensures the cooling effect of the cooling pipes closer to the rear of the vehicle in the direction of travel. When K2 is an even number, the principle is similar.

[0015] In the above technical solution, the cooler liquid inlet (1A) and the cooler liquid outlet (1B) are respectively connected to the coolant outlet (20B) and the coolant inlet (20A) of the vehicle-mounted transformer box (20).

[0016] In the above technical solution, in each cooling tube (101) of at least one cooling tube unit, the spacing between adjacent cooling tubes (101) increases sequentially from the outside to the inside.

[0017] In the present invention, according to the above solution, the wind speed distribution between different cooling pipes in the same cooling pipe unit can be balanced.

[0018] In a preferred technical solution, the product of D_n and L_n is a fixed value, and the fixed value is a preset constant; n=1, 2, ..., N; N is the number of cooling tubes (101) in the at least one cooling tube unit; D_n and L_n are respectively the inner diameter and the length of the nth cooling tube (101) in the at least one cooling tube unit.

[0019] In the above technical solution, in each cooling tube (101) of at least one cooling tube unit, the tube wall thickness of each cooling tube (101) increases sequentially from the inside to the outside.

[0020] In the same cooling tube unit, the cantilever length of the cooling tube located on the outside is longer than that of the cooling tube located on the inside. According to the above scheme of the present invention, different cantilever lengths and the tube wall thickness of the cooling tube are reasonably adapted to ensure the mechanical strength of each cooling tube under vibration and impact, reduce the weight of the entire cooling tube, and improve the ability of the outer cooling tube to resist foreign matter impact.

[0021] In the above technical solution, the cooler (10) shell has a cooler liquid inlet (1A) and a cooler liquid outlet (1B); The cooler (10) comprises a box body (11), a substrate (12) covering the box body (11), and the cooling tube (101); the box body (11) is divided into a first sub-cavity (C_1) and a second sub-cavity (C_2); the cooler liquid inlet (1A) and the cooler liquid outlet (1B) are provided on the box body (11); through holes corresponding to the sizes of the cooling tubes (101) are provided on the substrate (12); and two ends of each cooling tube (101) pass through the corresponding through holes and are respectively connected to the first sub-cavity (C_1) and the second sub-cavity (C_2).

[0022] According to the above solution of the present invention, each cooling pipe is supported and fixed conveniently by opening a through hole on the substrate.

[0023] Preferably, the cooler liquid inlet (1A) and the cooler liquid outlet (1B) are respectively connected to the coolant outlet (20B) and the coolant inlet (20A) of the vehicle-mounted transformer box (20).

[0024] According to the same inventive concept, the present invention also provides a rail vehicle, comprising the above-mentioned cooler, wherein the on-board transformer is a traction transformer of the rail vehicle.

[0025] The advantages and positive effects of the present invention are as follows: the present invention proposes a cooler for a vehicle-mounted traction transformer, which is suitable for a vehicle-mounted transformer in rail transit. The present invention utilizes the traction transformer and the surrounding running wind when the vehicle is running to cool the traction transformer, and has high running wind utilization, high heat dissipation efficiency, low noise, easy maintenance, and low maintenance cost, and is particularly suitable for the case where the transformer is arranged under the vehicle with complex flow field and wind speed distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1It is a schematic diagram of the connection between the vehicle-mounted transformer box and the cooler in the prior art; Figure 2 is a schematic top view of a cooler according to Embodiment 1 of the present invention (seen in the vehicle height direction); Figure 3 is a side view schematic diagram of a cooler according to Embodiment 1 of the present invention (seen along the length direction of the vehicle), wherein the structure of the sub-cavity is shown in dotted line form; Figure 4 is a front view schematic diagram of a cooler according to Embodiment 1 of the present invention (seen along the width direction of the vehicle); Figure 5 is a side view schematic diagram of the cooler of Example 1 of the present invention when it is installed on the bottom of the vehicle (seen along the length direction of the vehicle); Figure 6 is a side view schematic diagram of a cooler according to Embodiment 2 of the present invention when it is installed on the bottom of a vehicle (seen along the length direction of the vehicle); Figure 7 It is a schematic diagram of the connection between the vehicle-mounted transformer box and two coolers according to Embodiment 2 of the present invention.

[0028] In the above drawings, vehicle 100; cooler 10; box body 11; substrate 12; cooling pipe 101; cooler liquid inlet 1A; cooler liquid outlet 1B; cooling pipe unit; C_1 is the first sub-cavity; C_2 is the second sub-cavity; U_1 is the first cooling pipe unit; U_K2 is the K2 cooling pipe unit; coolant inlet 1A1; coolant outlet 1B1; B1 and A1 are respectively the inlet and outlet of the outermost cooling pipe in the first cooling pipe unit in the vehicle length direction; B2 and A2 are respectively the inlet and outlet of the innermost cooling pipe in the first cooling pipe unit in the vehicle length direction; A3 and B3 are respectively the inlet and outlet of the outermost cooling pipe in the last cooling pipe unit in the vehicle length direction; A4 and B4 are respectively the inlet and outlet of the innermost cooling pipe in the last cooling pipe unit in the vehicle length direction; On-vehicle transformer box 20; coolant inlet 20A; coolant outlet 20B; Pump 30; Liquid outlet pipe 301; first liquid outlet branch pipe 301A; second liquid outlet branch pipe 301B; Liquid inlet pipe 302; first liquid inlet branch pipe 302A; second liquid inlet branch pipe 302B; xx represents the length direction of the vehicle; yy represents the width direction of the vehicle; zz represents the height direction of the vehicle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Example 1 like Figure 2-Figure 5 As shown, the present invention provides a cooler for a vehicle-mounted transformer, wherein the cooler 10 shell has a cooler liquid inlet 1A and a cooler liquid outlet 1B; the cooler 10 shell is divided into a first sub-cavity (C_1) and a second sub-cavity (C_2), the first sub-cavity C_1 has a coolant inlet 1A1 connected to the cooler liquid inlet 1A, the second sub-cavity C_2 has a coolant outlet 1B1 connected to the cooler liquid outlet 1B, the first sub-cavity is connected to the second sub-cavity through each cooling pipe, so that the cooler liquid inlet 1A, the first sub-cavity C_1, the second sub-cavity C_2, and the cooler liquid outlet 1B are connected in sequence; at least a portion of each cooling pipe 101 is located outside the cooler shell, and the shape of each cooling pipe 101 can be U-shaped or arc-shaped, and the portion of the cooling pipe 101 located outside the cooler shell 10 is also U-shaped or arc-shaped.

[0031] One end of each cooling tube 101 is inserted into the corresponding through hole on the substrate 12 and communicates with the first sub-cavity, and the other end is inserted into the corresponding through hole on the substrate 12 and communicates with the second sub-cavity. The portion of the cooling tube 101 located outside the shell of the cooler forms a U-shaped structure, and the opening of the U-shaped structure faces the substrate 12. The substrate 12 and the box body 11 as a whole constitute the shell of the cooler, that is, at least part of each cooling tube 101 is located outside the overall structure formed by the substrate 12 and the box body 11, wherein each sub-cavity is located inside the box body 11.

[0032] The extension direction of the projection of the cooling pipe 101 on the first plane is parallel to the second direction; the first plane is parallel to both the first direction and the second direction.

[0033] In this embodiment, the first direction is the vehicle length direction xx, and the second direction is the vehicle height direction zz.

[0034] Each cooling tube unit includes at least two cooling tubes 101 which are sequentially arranged from the inside to the outside, and in each cooling tube unit, the cooling tube 101 located on the outside surrounds the cooling tube 101 adjacent to it and located on the inside.

[0035] When the on-board transformer is installed in a vehicle, the first direction is parallel to the length direction of the vehicle 100 .

[0036] like Figure 2 As shown, the total number of cooling tube units is K2, K2 ≥ 2; K2 is an odd number or an even number. In this embodiment. The first cooling tube unit, the second cooling tube unit, ..., the K2 cooling tube unit are sequentially arranged in a first direction (the length direction of the vehicle 100). K2 is an odd number or an even number, K2 ≥ 2; the first direction is the length direction of the cooler 10. The plane perpendicular to the first direction is defined as the second plane.

[0037] Preferably, the ua-th cooling tubes 101 of each cooling tube unit are arranged correspondingly in the first direction, wherein ua=1, 2, ..., UA; UA is the number of cooling tubes 101 in the cooling tube unit, and UA≥2.

[0038] When K2 is an odd number, at least part of the projection of the uath cooling tube 101 of the j1+1th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube 101 of the j1th cooling tube unit on the second plane, 1≤j1≤[(K2+1) / 2]-1; at least part of the projection of the uath cooling tube 101 of the j2th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube 101 of the j2+1th cooling tube unit on the second plane, (K2+1) / 2≤j2≤K2-1.

[0039] When K2 is 2, at least part of the projection of the uath cooling tube 101 of the second cooling tube unit on the second plane is not covered by the projection of the uath cooling tube 101 of the first cooling tube unit on the second plane; at least part of the projection of the uath cooling tube (101) of the first cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the second cooling tube unit on the second plane; that is, when K2=2, the projection of the uath cooling tube of the first cooling tube unit and the projection of the uath cooling tube of the second cooling tube unit cannot completely cover each other, so that no matter in which direction the vehicle travels, the running wind can blow to the cooling tube located behind in the traveling direction.

[0040] When K2 is an even number greater than or equal to 4, at least part of the projection of the uath cooling tube 101 of the j3+1th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube 101 of the j3th cooling tube unit on the second plane, 1≤j3≤(K2 / 2)-1; at least part of the projection of the uath cooling tube 101 of the j4th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube 101 of the j4+1th cooling tube unit on the second plane, (K2 / 2)+1≤j4≤K2-1.

[0041] More preferably, when K2 is an odd number, the projection of the ua th cooling tube 101 of the j1+1 th cooling tube unit on the second plane accommodates the projection of the ua th cooling tube 101 of the j1 th cooling tube unit on the second plane; the projection of the ua th cooling tube 101 of the j2 th cooling tube unit on the second plane accommodates the projection of the ua th cooling tube 101 of the j2+1 th cooling tube unit on the second plane.

[0042] More preferably, when K2 is an even number greater than or equal to 4, the projection of the ua th cooling tube 101 of the j3+1 th cooling tube unit on the second plane accommodates the projection of the ua th cooling tube 101 of the j3 th cooling tube unit on the second plane; the projection of the ua th cooling tube 101 of the j4 th cooling tube unit on the second plane accommodates the projection of the ua th cooling tube 101 of the j4+1 th cooling tube unit on the second plane.

[0043] In this embodiment, one projection contains another projection, which also includes the situation that the outer edges of the two projections do not overlap at all.

[0044] Preferably, the number of cooling tubes 101 in each cooling tube unit is UA, and the ua-th cooling tube 101 of each cooling tube unit is correspondingly arranged, that is, the projections of the ua-th cooling tube 101 of the K2 cooling tube units on the second plane have overlapping parts. The projections of the center lines of the ua-th cooling tube 101 of each cooling tube unit on the second plane completely overlap (for example, overlap on the u-th curve of the second plane), and the second plane is perpendicular to the first direction. When K2 is an odd number, from the 1st cooling tube unit to the (K2+1) / 2nd cooling tube unit, the outer diameters of the correspondingly arranged cooling tube units increase successively, and from the (K2+1) / 2nd cooling tube unit to the K2nd cooling tube unit, the outer diameters of the correspondingly arranged cooling tube units decrease successively. When K2 is an even number, the outer diameters of the corresponding cooling tube units increase successively from the 1st cooling tube unit to the (K2 / 2)th cooling tube unit, and the outer diameters of the corresponding cooling tube units decrease successively from the (K2+2) / 2th cooling tube unit to the K2th cooling tube unit, and the outer diameters of the corresponding cooling tube units from the (K2 / 2)th cooling tube unit to the (K2+2) / 2th cooling tube unit may be equal.

[0045] like Figure 2 As shown, in this embodiment, K2 ≥ 4 can be set.

[0046] When K2 is an odd number, the spacing between adjacent cooling tube units in the first direction increases from the 1st cooling tube unit U_1 to the (K2+1) / 2nd cooling tube unit, and the spacing between adjacent cooling tube units in the first direction decreases from the (K2+1) / 2nd cooling tube unit to the K2nd cooling tube unit. The spacing between the (K2+1) / 2nd cooling tube unit and the cooling tube units on both sides thereof can be set to be equal.

[0047] When K2 is 4, the spacing between the first cooling tube unit U_1 and the second cooling tube unit in the first direction, and the spacing between the third cooling tube unit and the fourth cooling tube unit in the first direction are both smaller than the spacing between the second cooling tube unit and the third cooling tube unit in the first direction; When K2 is an even number greater than or equal to 6, the spacing between adjacent cooling tube units in the first direction increases successively from the 1st cooling tube unit U_1 to the (K2 / 2)+1th cooling tube unit, and the spacing between adjacent cooling tube units in the first direction decreases successively from the K2 / 2th cooling tube unit to the K2th cooling tube unit.

[0048] The cooler liquid inlet 1A and the cooler liquid outlet 1B are respectively connected to the coolant outlet 20B and the coolant inlet 20A of the vehicle-mounted transformer box 20 .

[0049] In each cooling tube 101 of at least one cooling tube unit, the spacing between adjacent cooling tubes 101 increases from the outside to the inside. For example, in a cooling tube unit, the first cooling tube, the second cooling tube, ..., the UA-th cooling tube are arranged from the inside to the outside, then the spacing between the first and second cooling tubes> the spacing between the second and third cooling tubes> ...> the spacing between the UA-1-th and UA-th cooling tubes.

[0050] In each cooling tube 101 of at least one cooling tube unit, the inner diameter of each cooling tube 101 increases from the inside to the outside, that is, the inner diameter of the first cooling tube < the inner diameter of the second cooling tube < ... < the inner diameter of the UAth cooling tube.

[0051] Preferably, the product of D_n and L_n is a constant, and the constant is a preset constant. That is, D_1×L_1=D_2×L_2=……=D_n×L_n. n=1,2,……,N. N is the number of cooling tubes 101 in the at least one cooling tube unit. D_n and L_n are the inner diameter and length of the nth cooling tube 101 in the at least one cooling tube unit, respectively.

[0052] In each cooling tube 101 of at least one cooling tube unit, the tube wall thickness of each cooling tube 101 increases from the inside to the outside, that is, the tube wall thickness of the first cooling tube < the tube wall thickness of the second cooling tube < ... < the tube wall thickness of the UAth cooling tube.

[0053] The cooler 10 includes a box body 11, a substrate 12 covering the box body 11, and the cooling tube 101. The box body 11 is divided into a first sub-cavity C_1 and a second sub-cavity C_2. The cooler liquid inlet 1A and the cooler liquid outlet 1B are opened on the box body 11. The substrate 12 is provided with through holes adapted to the sizes of each cooling tube 101. Both ends of each cooling tube 101 pass through the corresponding through holes and are connected to the corresponding sub-cavity.

[0054] According to the same inventive concept, the present invention also provides a rail vehicle, comprising the above-mentioned cooler, wherein the on-board transformer is a traction transformer of the rail vehicle.

[0055] The present embodiment is described in further detail below.

[0056] The present invention provides a cooler for a vehicle-mounted traction transformer, which is suitable for the field of transportation vehicles and has the advantages of high running wind utilization, high heat dissipation efficiency, low noise, easy maintenance, and low full life cycle cost.

[0057] The cooler 10 includes an integrated cooling pipe, a base plate 12, a box body 11, a cooler liquid inlet 1A, a cooler liquid outlet 1B, etc. The integrated cooling pipe includes a plurality of cooling pipe units, such as Figure 2 As shown. For example, when K2 is 6, the arrangement direction of the first cooling tube unit U_1, the second cooling tube unit, ..., the sixth cooling tube unit is the driving direction. Starting from one end, the spacing s(1) between the first cooling tube unit and the second cooling tube unit, the spacing between the second cooling tube unit and the third cooling tube unit, and the spacing between the third cooling tube unit and the fourth cooling tube unit increase successively, and the spacing between the third cooling tube unit and the fourth cooling tube unit, the spacing between the fourth cooling tube unit and the fifth cooling tube unit, and the spacing between the fifth cooling tube unit and the sixth cooling tube unit decrease successively. Through the above settings, the wind speed distribution between the cooling tube units can be balanced when the driving direction is different.

[0058] The outer diameter of the cooling tube 101 increases from the first cooling tube unit to the middle cooling tube unit, and then decreases from the middle cooling tube unit to the K2th cooling tube unit. Through the above arrangement, the matching of the internal flow velocity and the external wind velocity of different cooling tube units can be improved, the contact and heat dissipation area between the cooling tube and the running wind can be increased, and the internal resistance can be reduced at the same time. In the length direction of the train, the axes of each cooling tube are aligned, and the outer diameter of the cooling tube in the rear cooling tube unit in the front half is larger than the outer diameter of the cooling tube in the front cooling tube unit, so that the running wind can blow onto the rear cooling tube unit. When K2 is an odd number, the (K2+1) / 2th cooling tube unit is the middle cooling tube unit; when K2 is an even number, the K2 / 2th cooling tube unit and the K2 / 2+1th cooling tube unit can both be called the middle cooling tube unit.

[0059] In each cooling pipe unit, the arrangement plane of each cooling pipe 101 is perpendicular to the driving direction. Figure 3 In each cooling pipe unit, the spacing of the cooling pipes 101 increases from the outside to the inside, so as to balance the wind speed distribution between the different cooling pipes inside and outside. Figure 3 d is the distance between the outermost cooling tube 101 and its adjacent cooling tube 101 .

[0060] In each cooling tube unit, the inner diameter of the cooling tube 101 decreases from the outside to the inside, which is used to balance the resistance and flow rate inside the tube, improve the matching of the internal flow rate of different cooling tubes 101 with the external wind speed, and increase the heat exchange efficiency between different media inside and outside the cooling tube 101. For the cooling tube 101 located on the outside and with a longer pipeline length, the fluid resistance is greater. Since the inlet of each cooling tube 101 is located in the same sub-cavity, the liquid tends to flow to the cooling tube 101 on the inside with less resistance. Through the above arrangement, the inner diameter of the cooling tube 101 located on the outside is larger, thereby reducing the fluid resistance of the pipeline located on the outside. Since the fluid resistance in the cooling tube 101 is proportional to the length of the pipeline and inversely proportional to the inner diameter of the pipeline, the product of the length and inner diameter of each cooling tube 101 in the same cooling tube unit can be set to a constant value, so that the distribution of the coolant in each cooling tube in the same cooling tube unit is more balanced.

[0061] In each cooling tube unit, the tube wall thickness of the cooling tube 101 decreases from the outside to the inside, and the different cantilever lengths and tube wall thicknesses are reasonably adapted to ensure strength while reducing weight, while also improving the ability of the outer cooling tube to resist being hit by foreign objects.

[0062] like Figure 2 As shown, the base plate 12 is provided with a hole matching the position and size of each cooling tube 101, and the cooling tube 101 is inserted into the base plate 12 through the hole. A box body 11 for communicating with the cooling tube 101 is provided on the other side of the base plate 12, as shown in FIG. Figure 4 shown.

[0063] like Figure 4 As shown, the first cooling tube unit U_1, the second cooling tube unit, ..., the K2 cooling tube unit U_K2 are sequentially arranged in the first direction. The coolant enters from the coolant inlet 1A1 of the first sub-cavity C_1, passes through the first sub-cavity C_1 and each cooling tube 101 connecting the first sub-cavity C_1 and the second sub-cavity C_2, and flows to the second sub-cavity C_2. After the coolant is mixed in the second sub-cavity C_2, it flows out from the coolant outlet 1B1 of the second sub-cavity C_2 to the vehicle transformer box 20.

[0064] Mounting seats can be provided on both sides of the substrate 12 of the cooler 10, and the cooler 10 can be installed on the vehicle body or the vehicle transformer box 20 through the mounting seats. The mounting seats can also be provided on the box body 11 or the substrate 12.

[0065] When the on-board transformer is installed at the bottom of the vehicle, within the boundary of the bottom of the vehicle, the running wind speed near the two sides is higher than that in the middle, and the running wind speed near the boundary of the vehicle and at the bottom of the vehicle is higher. The installation position of the cooler can be located near the boundary of the vehicle, such as Figure 4 The dashed line shown is the vehicle limit. The vehicle limit is the projection of the outer edge of the vehicle on the plane where the on-board transformer box 20 is located (a plane perpendicular to the vehicle length) along the vehicle length direction.

[0066] The cooling tube 101 in the cooler can be a tube structure of different shapes such as an elliptical tube, a round tube, a flat tube, a rectangular tube, etc. The coolant can be oil, water, an evaporable liquid, or other liquids. The cooler can be used to cool a transformer, and can also be used to cool other vehicle-mounted equipment such as a converter and a motor.

[0067] Example 2 like Figure 6 , Figure 7 As shown, the difference between this embodiment 2 and embodiment 1 is that: the number of coolers is 2; the coolant outlet 20B of the vehicle transformer box 20 is connected to the inlet of the pump 30 through the liquid outlet pipe 301, and the outlet of the pump 30 is connected to the inlet of the first liquid outlet branch pipe 301A and the inlet of the second liquid outlet branch pipe 301B; the outlet of the first liquid outlet branch pipe 301A is connected to the inlet of the first liquid inlet branch pipe 302A through a cooler 10, and the outlet of the second liquid outlet branch pipe 301B is connected to the inlet of the second liquid inlet branch pipe 302B through another cooler 10; the outlets of the first liquid inlet branch pipe 302A and the second liquid inlet branch pipe 302B are both connected to the inlet of the liquid inlet pipe 302, and the outlet of the liquid inlet pipe 302 is connected to the coolant inlet 20A of the vehicle transformer box 20. Two coolers 10 can be respectively arranged on both sides of the vehicle transformer box 20.

[0068] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0069] The embodiments of the present invention are described in detail above, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention should still be included in the scope of the present invention. After reading the present invention, the modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. A cooler for an on-vehicle transformer, wherein the cooler (10) shell is connected to at least one cooling pipe unit, each cooling pipe unit comprises at least two cooling pipes (101) arranged in sequence from the inside to the outside, and in each cooling pipe unit, the cooling pipe (101) located on the outside is wound around the cooling pipe (101) adjacent to it and located on the inside, characterized in that: In each cooling tube (101) of at least one cooling tube unit, the inner diameter of each cooling tube (101) increases sequentially from the inside to the outside; At least part of the cooling pipe (101) is located outside the shell of the cooler (10).

2. The cooler according to claim 1, characterized in that: In the length direction of the vehicle (100), the first cooling tube unit (U_1), the second cooling tube unit, ..., the K2 cooling tube unit (U_K2) are arranged in sequence in a first direction; K2 ≥ 2; K2 is an odd number or an even number; the first direction is any one of the length direction, the width direction, and the height direction of the cooler (10); Preferably, when the on-board transformer is installed on a vehicle, the first direction is parallel to the length direction of the vehicle (100).

3. The cooler according to claim 2, characterized in that: K2≥4； When K2 is an odd number, the spacing between adjacent cooling tube units increases from the 1st cooling tube unit (U_1) to the (K2+1) / 2nd cooling tube unit, and decreases from the (K2+1) / 2nd cooling tube unit to the K2nd cooling tube unit. When K2 is 4, the spacing between the first cooling tube unit (U_1) and the second cooling tube unit, and the spacing between the third cooling tube unit and the fourth cooling tube unit are both smaller than the spacing between the second cooling tube unit and the third cooling tube unit; When K2 is an even number greater than or equal to 6, the spacing between adjacent cooling tube units increases from the 1st cooling tube unit (U_1) to the (K2+2) / 2th cooling tube unit, and decreases from the K2 / 2th cooling tube unit to the K2th cooling tube unit.

4. The cooler according to claim 2, characterized in that: The ua-th cooling pipe (101) of each cooling pipe unit is arranged correspondingly in the first direction; When K2 is an odd number, at least a portion of the projection of the uath cooling tube (101) of the j1+1th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the j1th cooling tube unit on the second plane, 1≤j1≤[(K2+1) / 2]-1; at least a portion of the projection of the uath cooling tube (101) of the j2th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the j2+1th cooling tube unit on the second plane, (K2+1) / 2≤j2≤K2-1; wherein the second plane is a plane perpendicular to the first direction; When K2 is 2, at least a portion of the projection of the uath cooling tube (101) of the second cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the first cooling tube unit on the second plane, and at least a portion of the projection of the uath cooling tube (101) of the first cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the second cooling tube unit on the second plane; When K2 is an even number greater than or equal to 4, at least a portion of the projection of the uath cooling tube (101) of the j3+1th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the j3th cooling tube unit on the second plane, 1≤j3≤(K2 / 2)-1; at least a portion of the projection of the uath cooling tube (101) of the j4th cooling tube unit on the second plane is not covered by the projection of the uath cooling tube (101) of the j4+1th cooling tube unit on the second plane, (K2 / 2)+1≤j4≤K2-1; Wherein, ua=1,2,...,UA; UA is the number of cooling pipes (101) in the cooling pipe unit, and UA≥2.

5. The cooler according to claim 4, characterized in that: When K2 is an odd number, the projection of the uath cooling tube (101) of the j1+1th cooling tube unit on the second plane accommodates the projection of the uath cooling tube (101) of the j1th cooling tube unit on the second plane; the projection of the uath cooling tube (101) of the j2th cooling tube unit on the second plane accommodates the projection of the uath cooling tube (101) of the j2+1th cooling tube unit on the second plane; When K2 is an even number greater than or equal to 4, the projection of the ua th cooling tube (101) of the j3+1 th cooling tube unit on the second plane accommodates the projection of the ua th cooling tube (101) of the j3 th cooling tube unit on the second plane; the projection of the ua th cooling tube (101) of the j4 th cooling tube unit on the second plane accommodates the projection of the ua th cooling tube (101) of the j4+1 th cooling tube unit on the second plane.

6. The cooler according to any one of claims 1 to 4, characterized in that: In each cooling tube (101) of at least one cooling tube unit, the spacing between adjacent cooling tubes (101) increases sequentially from the outside to the inside.

7. The cooler according to any one of claims 1 to 4, characterized in that: The product of D_n and L_n is a fixed value, and the fixed value is a preset constant; n=1, 2, ..., N; N is the number of cooling tubes (101) in the at least one cooling tube unit; D_n and L_n are respectively the inner diameter of the nth cooling tube (101) and the length of the nth cooling tube (101) in the at least one cooling tube unit.

8. The cooler according to any one of claims 1 to 4, characterized in that: In each cooling tube (101) of at least one cooling tube unit, the tube wall thickness of each cooling tube (101) increases sequentially from the inside to the outside.

9. The cooler according to any one of claims 1 to 4, characterized in that: The cooler (10) shell has a cooler liquid inlet (1A) and a cooler liquid outlet (1B); The cooler (10) comprises a box body (11), a substrate (12) covering the box body (11), and the cooling tube (101); the box body (11) is divided into a first sub-cavity (C_1) and a second sub-cavity (C_2); the cooler liquid inlet (1A) and the cooler liquid outlet (1B) are provided on the box body (11); through holes corresponding to the sizes of the cooling tubes (101) are provided on the substrate (12); and two ends of each cooling tube (101) pass through corresponding through holes and are respectively connected to the first sub-cavity (C_1) and the second sub-cavity (C_2); Preferably, the cooler liquid inlet (1A) and the cooler liquid outlet (1B) are respectively connected to the coolant outlet (20B) and the coolant inlet (20A) of the vehicle-mounted transformer box (20).

10. A rail vehicle, characterized in that: It comprises the cooler according to any one of claims 1 to 9, wherein the on-board transformer is a traction transformer of a rail vehicle.

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