Protective device of locomotive traction motor scavenging port

Abstract

The invention provides a protection device for a locomotive traction motor ventilation port, the protection device comprises a base, a main body and a ventilation protection part, the main body is box-shaped, the side of the main body is provided with an opening, the base is connected to the side, facing the opening, of the main body, and the base is configured to be in contact with the locomotive traction motor ventilation port; the ventilation protection part comprises a first ventilation protection part and a second ventilation protection part, the first ventilation protection part is arranged on the bottom wall of the main body, the second ventilation protection part is arranged on the side, facing the opening, of the main body, the first ventilation protection part and the second ventilation protection part are each provided with a plurality of ventilation holes, and the ventilation holes communicate with the inner side and the outer side of the main body. The protection device of the locomotive traction motor scavenging port is good in protection effect.

Description

Technical Field

[0001] The present application relates to the technical field of protection of ventilation ports of locomotive traction motors, and in particular to a protection device for ventilation ports of locomotive traction motors. Background Art

[0002] The Harmony 3D / D3 passenger electric locomotive is currently the largest and fastest high-power AC transmission passenger electric locomotive with remarkable performance. Compared with the existing popular AC passenger locomotives, its traction performance has been greatly improved, and the speed has been increased by 30%. Compared with the traditional DC passenger locomotives of the same speed, its acceleration time and acceleration distance have been shortened by at least half. It only takes 5 minutes from starting to accelerating to 160 kilometers. Therefore, the quality requirements for the running gear of the locomotive are very high. After the wheelset motor is assembled during overhaul, the wheelset needs to be run-in tested. During the running-in test, the ventilation port on the gearbox is observed by a guard to prevent debris from entering the rotor and stator of the motor from the ventilation port, causing the motor to "sweep the chamber" phenomenon, and there are major safety hazards after loading and operation, resulting in huge maintenance costs, extended maintenance cycles and waste of labor.

[0003] However, the use of dedicated personnel to stay at the ventilation opening for observation and protection may easily lead to inadequate protection and waste of labor. Summary of the invention

[0004] Based on this, the present application provides a protective device for the ventilation port of a locomotive traction motor to address the deficiencies in the related art.

[0005] The present application provides a protective device for a ventilation port of a locomotive traction motor. The protective device for the ventilation port of a locomotive traction motor includes a base, a main body and a breathable protective part. The main body is box-shaped and has an opening on the side of the main body. The base is connected to the side of the main body facing the opening. The base is constructed to contact the ventilation port of the locomotive traction motor. The breathable protective part includes a first breathable protective part and a second breathable protective part. The first breathable protective part is arranged on the bottom wall of the main body, and the second breathable protective part is arranged on the side of the main body facing the opening. Both the first protective part and the second breathable protective part are provided with a plurality of air holes, and the air holes are connected to the inside and the outside of the main body.

[0006] In a possible implementation, in the protective device for the ventilation port of a locomotive traction motor provided in the present application, the projection of the first breathable protective part on the second breathable protective part is located inside the second breathable protective part.

[0007] In a possible implementation, in the protective device for the ventilation port of the locomotive traction motor provided in the present application, the ventilation holes located in the first ventilation protective part and the ventilation holes located in the second ventilation protective part are at least partially staggered.

[0008] In a possible implementation, the protective device for the ventilation port of the locomotive traction motor provided in the present application has a ventilation hole with a diameter greater than or equal to 2 mm and less than or equal to 4 mm.

[0009] In a possible implementation, in the protective device for the ventilation port of a locomotive traction motor provided in the present application, the second breathable protective portion is connected to the base, and the second breathable protective portion is matched with the opening.

[0010] In a possible implementation, in the protective device for the ventilation port of a locomotive traction motor provided in the present application, the projection of the base on the main body is a first trapezoid.

[0011] In a possible implementation, the protective device for the ventilation port of the locomotive traction motor provided by the present application has an upper base of the first trapezoid greater than or equal to 278 mm and less than or equal to 282 mm;

[0012] The lower base of the first trapezoid is greater than or equal to 288 mm and less than or equal to 292 mm;

[0013] The height of the first trapezoid is greater than or equal to 568 mm and less than or equal to 572 mm.

[0014] In a possible implementation, the protective device for the ventilation port of a locomotive traction motor provided in the present application has a main body whose projection on the base is a second trapezoid.

[0015] In a possible implementation, the protective device for the ventilation port of the locomotive traction motor provided by the present application has an upper base of the second trapezoid greater than or equal to 258 mm and less than or equal to 262 mm;

[0016] The lower base of the second trapezoid is greater than or equal to 268 mm and less than or equal to 272 mm;

[0017] The height of the second trapezoid is greater than or equal to 528 mm and less than or equal to 532 mm.

[0018] In a possible implementation, the protective device for the ventilation port of the locomotive traction motor provided by the present application, the first ventilation protection portion is located in the middle of the main body, the first ventilation protection portion is rectangular, and the length of the first ventilation protection portion is greater than or equal to 258 mm and less than or equal to 262 mm;

[0019] The width of the first breathable protective portion is greater than or equal to 178 mm and less than or equal to 182 mm.

[0020] The present application provides a protective device for a ventilating port of a locomotive traction motor, the protective device for the ventilating port of the locomotive traction motor comprises a base, a main body and a breathable protective part, the protective part comprises a first protective part and a second protective part, the base is provided to contact the ventilating port of the locomotive traction motor, so that the protective device for the ventilating port of the locomotive traction motor is installed to the ventilating port of the locomotive traction motor, the main body is provided to comprehensively protect the ventilating port of the locomotive traction motor, so as to prevent foreign matter from entering the ventilating port of the locomotive traction motor, the breathable protective part is provided to simultaneously protect the ventilating port of the locomotive traction motor and allow air to circulate between the ventilating port of the locomotive traction motor and the external environment, the first breathable protective part is provided to preliminarily block foreign matter, and the second breathable protective part is provided to secondarily block foreign matter, so as to improve the protective effect of the breathable protective part. Therefore, the protective device for the ventilating port of the locomotive traction motor using the present application has a good protective effect, and manual duty can be eliminated, thereby reducing the test cost of the running-in test of the locomotive wheelset, and improving the test efficiency of the running-in test of the locomotive wheelset. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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 work.

[0022] Figure 1 A schematic structural diagram of a protective device for a ventilating port of a locomotive traction motor according to an embodiment of the present application;

[0023] Figure 2 for Figure 1 A top view of

[0024] Figure 3 This is a schematic structural diagram of the second protection part in the protection device of the ventilation port of the locomotive traction motor according to an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 100-base;

[0027] 200-main body;

[0028] 210-opening;

[0029] 300-breathable protection part;

[0030] 310-first breathable protective portion;

[0031] 320- second breathable protective part;

[0032] 330-Ventilation holes. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] The terms "first", "second", "third" (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0037] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0038] The Harmony 3D / D3 passenger electric locomotive is an AC-driven six-axle mainline passenger electric locomotive, which can ease the tense situation of quasi-high-speed locomotive operation on the entire railway and fill the gap in the actual operation of AC-driven high-power locomotives in the quasi-high-speed range. The Harmony 3D / D3 passenger electric locomotive has a maximum speed of 160 kilometers per hour. With a power of 7,200 kilowatts, it is not limited to running on railway passenger dedicated lines. The Harmony 3D / D3 passenger electric locomotive can run on all electrified lines, realizing the parallel operation of high-speed railway passenger dedicated lines and ordinary railways, and meeting the requirements of diversified passenger transportation forms.

[0039] The Harmony 3D / D3 passenger electric locomotive is currently the largest and fastest high-power AC transmission passenger electric locomotive with remarkable performance. Compared with the existing popular AC passenger locomotives, its traction performance has been greatly improved, and the speed has been increased by 30%. Compared with the traditional DC passenger locomotives of the same speed, its acceleration time and acceleration distance have been shortened by at least half. It only takes 5 minutes from starting to accelerating to 160 kilometers. Therefore, the quality requirements for the running gear of the locomotive are very high. After the wheelset motor is assembled during overhaul, the wheelset needs to be run-in tested. During the running-in test, the ventilation port on the gearbox is observed by a guard to prevent debris from entering the rotor and stator of the motor from the ventilation port, causing the motor to "sweep the chamber" phenomenon, and there are major safety hazards after loading and operation, resulting in huge maintenance costs, extended maintenance cycles and waste of labor.

[0040] However, the use of dedicated personnel to stay at the ventilation opening for observation and protection may easily lead to inadequate protection and waste of labor.

[0041] In view of the above problems, an embodiment of the present application provides a protective device for the ventilation port of a locomotive traction motor. By arranging a first breathable protective part and a second breathable protective part, the ventilation port of the locomotive traction motor is doubly protected to prevent foreign matter from entering the ventilation port of the locomotive traction motor. The protective effect is good and no special person is required to be on duty, which reduces the test cost of the wheelset running-in test and improves the test efficiency of the wheelset running-in test.

[0042] The technical solution of the protective device for the ventilation port of the locomotive traction motor provided in the embodiment of the present application is described in detail below in conjunction with the accompanying drawings.

[0043] Reference Figures 1 to 3As shown, the protective device for the ventilation port of the locomotive traction motor provided in the embodiment of the present application includes a base 100, a main body 200 and a breathable protective part 300, the main body 200 is box-shaped, and the side of the main body 200 has an opening 210, the base 100 is connected to the side of the main body 200 facing the opening 210, the base 100 is constructed to contact the ventilation port of the locomotive traction motor, the breathable protective part 300 includes a first breathable protective part 310 and a second breathable protective part 320, the first breathable protective part 310 is arranged on the bottom wall of the main body 200, and the second breathable protective part 320 is arranged on the side of the main body 200 facing the opening 210, the first protection and the second breathable protective part 320 are both provided with a plurality of air holes 330, and the air holes 330 are connected to the inner side of the main body 200 and the outer side of the main body 200.

[0044] In the present application, the protective device of the locomotive traction motor ventilation port is used to protect the locomotive traction motor ventilation port to prevent foreign matter from entering the traction motor through the locomotive traction motor ventilation port to avoid foreign matter from affecting the traction motor.

[0045] Specifically, the protective device for the ventilation port of the locomotive traction motor may include a base 100, a main body 200 and a breathable protective portion 300, wherein the base 100 is used to contact the ventilation port of the locomotive traction motor, that is, before conducting the locomotive wheelset running-in test, the inner wall of the base 100 is brought into contact with the outer wall of the ventilation port of the locomotive traction motor to fix the protective device for the ventilation port of the locomotive traction motor to the ventilation port of the locomotive traction motor.

[0046] The main body 200 is used to surround the ventilation port of the locomotive traction motor to prevent foreign matter from entering the interior of the traction motor from around the ventilation port of the locomotive traction motor. That is to say, the main body 200 is box-shaped, and the main body 200 may include four side walls and a bottom wall. When the protective device of the ventilation port of the locomotive traction motor is installed at the ventilation port of the locomotive traction motor, the four side walls are surrounded by the ventilation port of the locomotive traction motor, and the bottom wall cover is arranged above the ventilation port of the locomotive traction motor to comprehensively prevent foreign matter from entering the interior of the traction motor from the ventilation port of the locomotive traction motor, thereby avoiding the influence of foreign matter on the running-in test of the traction motor.

[0047] It should be noted that when conducting the wheelset running-in test, the traction motor still needs to be ventilated, and the ventilation port of the locomotive traction motor needs to be connected to the external environment. Therefore, the protective device of the ventilation port of the locomotive traction motor cannot completely close the ventilation port of the locomotive traction motor. Therefore, a breathable protective part 300 is provided on the protective device of the ventilation port of the locomotive traction motor, and a plurality of ventilation holes 330 are provided on the breathable protective part 300, so that the breathable protective part 300 is connected to the ventilation port of the locomotive traction motor and the external environment, so that air can circulate between the traction motor and the external environment, and at the same time, foreign matter can be prevented from entering the ventilation port of the locomotive traction motor through the breathable protective part 300.

[0048] In order to improve the protective performance of the breathable protective part 300, in a specific implementation, the breathable protective part 300 may include a first breathable protective part 310 and a second breathable protective part 320. The first breathable protective part 310 can initially block foreign matter. If foreign matter accidentally enters the interior of the main body 200 through the air hole 330 of the first breathable protective part 310, the second breathable protective part 320 can perform a second blockage on the foreign matter. In this way, the protective performance of the breathable protective part 300 can be improved through double protection to better prevent foreign matter from entering the ventilation port of the locomotive traction motor.

[0049] It should be understood that the base 100 can be made of aluminum alloy. The aluminum alloy base is light in weight, good in plasticity, and soft in material. When the base 100 is installed to the ventilation port of the locomotive traction motor, it will not knock or damage the traction motor. The main body 200 and the breathable protective part 300 can be made of iron plates to reduce the production cost. The base 100 and the main body 200 can be welded, riveted, or threaded. Among them, the first breathable protective part 310 can be integrally formed with the bottom wall of the main body 200, that is, a hole is punched on the bottom wall of the main body 200 to form a first breathable protective part 310 with a breathable hole 330, or a groove is made on the bottom wall of the main body 200, and the first breathable protective part 310 is connected to the bottom wall of the main body 200 by welding or threading.

[0050] Compared with the method of using manual guard to protect the ventilation port of the locomotive traction motor in the related art, the protective device for the ventilation port of the locomotive traction motor provided in the embodiment of the present application liberates part of the labor force, which can not only reduce the test cost of the wheelset running-in test, but also improve the test efficiency of the wheelset running-in test. Moreover, compared with manual guard, the protective device for the ventilation port of the locomotive traction motor has a better protective effect and can effectively prevent the traction motor from being swept due to foreign objects entering the inside of the traction motor.

[0051] The protective device for the ventilation port of a locomotive traction motor provided in the embodiment of the present application comprises a base 100, a main body 200 and a breathable protective part 300, the protective part comprising a first protective part and a second protective part, and the base 100 is provided to contact the ventilation port of the locomotive traction motor so as to install the protective device for the ventilation port of the locomotive traction motor to the ventilation port of the locomotive traction motor, and the main body 200 is provided to comprehensively protect the ventilation port of the locomotive traction motor to prevent foreign matter from entering the ventilation port of the locomotive traction motor, and the breathable protective part 300 is provided to simultaneously protect the ventilation port of the locomotive traction motor and allow air to circulate between the ventilation port of the locomotive traction motor and the external environment, and the first breathable protective part 310 is provided to preliminarily block foreign matter, and the second breathable protective part 320 is provided to secondarily block foreign matter, so as to improve the protective effect of the breathable protective part 300. Therefore, the protective device of the ventilation port of the locomotive traction motor using the present application has a better protective effect and can eliminate manual supervision, thereby reducing the test cost of the wheelset running-in test and improving the test efficiency of the wheelset running-in test.

[0052] In a possible implementation, a projection of the first breathable protective portion 310 on the second breathable protective portion 320 is located inside the second breathable protective portion 320 .

[0053] That is to say, the area of ​​the first breathable protective part 310 is smaller than that of the second breathable protective part 320. In this way, fewer air holes 330 are provided on the first breathable protective part 310, which can reduce the entry of foreign matter into the interior of the main body 200 through the air holes 330 on the first breathable protective part 310, thereby preventing foreign matter from entering the ventilation port of the locomotive traction motor.

[0054] As an optional implementation, the air holes 330 located in the first air-permeable protective portion 310 and the air holes 330 located in the second air-permeable protective portion 320 are at least partially staggered.

[0055] It is understandable that the projection of the air holes 330 on the first air-permeable protective part 310 on the second air-permeable protective part 320 and the air holes 330 on the second air-permeable protective part 320 should be at least partially staggered, so that after foreign matter accidentally enters the interior of the main body 200 through the air holes 330 on the first air-permeable protective part 310, it will not directly enter the ventilation port of the locomotive traction motor through the air holes 330 on the second air-permeable protective part 320. The non-ventilated portion of the second air-permeable protective part 320 can provide a second blockage for foreign matter to improve the protective effect of the air-permeable protective part 300.

[0056] In a possible implementation, the diameter of the air hole 330 is greater than or equal to 2 mm and less than or equal to 4 mm.

[0057] If the aperture of the air hole 330 is too small, it will be detrimental to air circulation. If the aperture of the air hole 330 is too large, it will not be able to effectively block smaller foreign objects. Therefore, setting the aperture of the air hole 330 between 2mm and 4mm can not only allow air to circulate more smoothly, but also effectively prevent foreign objects from entering the ventilation port of the locomotive traction motor.

[0058] In some embodiments, the second breathable protective portion 320 is connected to the base 100 , and the second breathable protective portion 320 is matched with the opening 210 .

[0059] That is to say, the second breathable protective part 320 can be set at the junction of the base 100 and the main body 200, and its shape and size are matched with the opening 210. In this way, the second breathable protective part 320 can completely cover the opening 210 to prevent foreign matter from entering the locomotive traction motor ventilation port through the opening 210, and the air holes 330 of the second breathable protective part 320 can provide air circulation.

[0060] The second breathable protective portion 320 may be connected to the base 100 by welding or threaded connection.

[0061] In a possible implementation, the projection of the base 100 on the main body 200 is a first trapezoid.

[0062] It should be noted that since the cross-section of the ventilation port of the Harmony series locomotive traction motor is trapezoidal, in order to adapt to the ventilation port of the locomotive traction motor, the cross-section shape of the base 100 should also be trapezoidal. Therefore, the projection of the base 100 on the main body 200 is a first trapezoid.

[0063] In some embodiments, the upper base of the first trapezoid is greater than or equal to 278 mm and less than or equal to 282 mm, the lower base of the first trapezoid is greater than or equal to 288 mm and less than or equal to 292 mm, and the height of the first trapezoid is greater than or equal to 568 mm and less than or equal to 572 mm.

[0064] For ease of explanation, please refer to Figure 2 As shown, the upper base of the first trapezoid is denoted as L1, the lower base is denoted as W1, and the height of the trapezoid is denoted as H1, that is, 278mm≤L1≤282mm, 288mm≤W1≤292mm, 568mm≤H1≤572mm, so that the cross-sectional size of the base 100 matches the cross-sectional size of the ventilation port of the locomotive traction motor, so that the inner wall of the base 100 is tightly attached to the outer wall of the ventilation port of the locomotive traction motor.

[0065] For example, the upper base L1 of the first trapezoid may be 280 mm, the lower base W1 may be 290 mm, and the ladder height H1 may be 570 mm.

[0066] In order to match the shape of the base 100, in a possible implementation, the projection of the main body 200 on the base 100 is a second trapezoid, so that the main body 200 is a box with a trapezoidal cross-section, and the side of the main body 200 has a trapezoidal opening 210. Correspondingly, the shape of the second breathable protective part 320 is also trapezoidal, and the size of the second breathable protective part 320 is adapted to the size of the opening 210.

[0067] Among them, the upper base of the second trapezoid is greater than or equal to 258mm and less than or equal to 262mm, the lower base of the second trapezoid is greater than or equal to 268mm and less than or equal to 272mm, and the height of the second trapezoid is greater than or equal to 528mm and less than or equal to 532mm.

[0068] Please continue to refer to Figure 2 As shown, the upper base of the second trapezoid is denoted as L2, the lower base is denoted as W2, and the height of the trapezoid is denoted as H2, that is, 258mm≤L1≤262mm, 268mm≤W1≤272mm, and 528mm≤H1≤532mm.

[0069] For example, the upper base L2 of the second trapezoid may be 260 mm, the lower base W2 may be 270 mm, and the ladder height H2 may be 530 mm.

[0070] In a possible implementation, the first air-permeable protective portion 310 is located in the middle of the main body 200, the first air-permeable protective portion 310 is rectangular, the length of the first air-permeable protective portion 310 is greater than or equal to 258 mm and less than or equal to 262 mm, and the width of the first air-permeable protective portion 310 is greater than or equal to 178 mm and less than or equal to 182 mm.

[0071] That is to say, the dimension of the first breathable protective portion 310 along the height direction of the second trapezoid is between 258mm and 262mm, and the dimension of the first breathable protective portion 310 along the upper base or lower base direction of the second trapezoid is between 178mm and 182mm. For example, the length of the first breathable protective portion 310 can be 260mm, and the width of the first breathable protective portion 310 can be 180mm.

[0072] In this way, a ventilation area of ​​appropriate size can be formed on the bottom wall of the main body 200, so that air can flow more smoothly between the ventilation port of the locomotive traction motor and the external environment.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A protective device for a ventilating port of a locomotive traction motor, characterized in that: It includes a base, a main body and a breathable protective part, the main body is box-shaped, and has an opening on the side of the main body. The base is connected to the side of the main body facing the opening, and the base is constructed to be in contact with the ventilation port of the locomotive traction motor. The breathable protective part includes a first breathable protective part and a second breathable protective part. The first breathable protective part is arranged on the bottom wall of the main body, and the second breathable protective part is arranged on the side of the main body facing the opening. The first protective part and the second breathable protective part are both provided with a plurality of air holes, and the air holes are connected to the inside and the outside of the main body.

2. The protective device for the ventilation port of a locomotive traction motor according to claim 1, characterized in that: The projection of the first breathable protective portion on the second breathable protective portion is located inside the second breathable protective portion.

3. The protective device for the ventilation port of the locomotive traction motor according to claim 2, characterized in that: The ventilation holes located in the first ventilation protective portion are at least partially staggered with the ventilation holes located in the second ventilation protective portion.

4. The protective device for the ventilation port of a locomotive traction motor according to claim 1, characterized in that: The diameter of the air holes is greater than or equal to 2 mm and less than or equal to 4 mm.

5. The protective device for the ventilation port of a locomotive traction motor according to any one of claims 1 to 4, characterized in that: The second air-permeable protective portion is connected to the base, and the second air-permeable protective portion is matched with the opening.

6. The protective device for the ventilation port of the locomotive traction motor according to claim 5, characterized in that: The projection of the base on the main body is a first trapezoid.

7. The protective device for the ventilation port of a locomotive traction motor according to claim 6, characterized in that: The upper base of the first trapezoid is greater than or equal to 278 mm and less than or equal to 282 mm; The lower base of the first trapezoid is greater than or equal to 288 mm and less than or equal to 292 mm; The height of the first trapezoid is greater than or equal to 568 mm and less than or equal to 572 mm.

8. The protective device for the ventilation port of a locomotive traction motor according to claim 7, characterized in that: The projection of the main body on the base is a second trapezoid.

9. The protective device for the ventilation port of a locomotive traction motor according to claim 8, characterized in that: The upper base of the second trapezoid is greater than or equal to 258 mm and less than or equal to 262 mm; The lower base of the second trapezoid is greater than or equal to 268 mm and less than or equal to 272 mm; The height of the second trapezoid is greater than or equal to 528 mm and less than or equal to 532 mm.

10. The protective device for the ventilation port of a locomotive traction motor according to claim 9, characterized in that: The first breathable protective portion is located in the middle of the main body, the first breathable protective portion is rectangular, and the length of the first breathable protective portion is greater than or equal to 258 mm and less than or equal to 262 mm; The width of the first breathable protective portion is greater than or equal to 178 mm and less than or equal to 182 mm.

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