Traction transformer oil pump of motor train unit
The dynamic train transformer oil pump design addresses thermal expansion issues by using a clamping piece and elastic element to prevent impeller wear, reducing noise and extending the pump's lifespan while ensuring transformer stability.
Patent Information
- Application Number
- CN202422279448.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-19
AI Technical Summary
The gap between the oil pump blade and the inlet end plate expands at high temperatures, causing scratches, creating noise and affecting service life. The metal debris generated by scratches contaminates the transformer oil, threatening the safety of the transformer.
The elastic member and an expansion ring are installed on the side of the impeller away from the pressing member. The expansion coefficient of the expansion ring is greater than that of the impeller. The elastic member is a compression spring or a butterfly spring, which pushes the impeller to offset by thermal expansion to avoid scratching.
It reduces the operating noise of the oil pump, extends the service life, and ensures the stable operation of the traction transformer.
Smart Images
Figure CN223104857U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformers, in particular to an oil pump for a traction transformer of a multiple unit train. Background Art
[0002] The traction transformer is a core component on a multiple unit train and is the power source for important functions such as traction, braking, and communication of the multiple unit train. The oil pump is the power source of the oil circulation cooling system of the traction transformer and plays a crucial role in the cooling system of the traction transformer.
[0003] In order to reduce volumetric loss and ensure the operating efficiency of the oil pump, the clearance between the oil pump blade and the inlet end plate needs to be set as small as possible. However, as the oil pump operates in high-temperature oil for a long time, the blade will undergo thermal expansion, causing the blade to scrape against the inlet end plate, which will not only generate noise but also affect the service life of the oil pump, and the metal debris generated by the scraping will contaminate the transformer oil and threaten the safe use of the transformer.
[0004] Based on the above technical problems, this application proposes an oil pump for a traction transformer of a multiple unit train. Content of the Utility Model
[0005] The purpose of the utility model is to provide an oil pump for a traction transformer of a multiple unit train to solve the technical problems mentioned in the background art. The purpose of the utility model is achieved through the following technical solutions:
[0006] An oil pump for a traction transformer of a multiple unit train includes a pump housing, an impeller, and a rotating shaft. The rotating shaft is rotatably installed on the pump housing through a sealing shaft sleeve. One end of the rotating shaft extending into the pump housing is fixed with a connecting shaft. The diameter of the connecting shaft is smaller than the diameter of the rotating shaft. One end of the connecting shaft is provided with a pressing member. The impeller is sleeved on the connecting shaft. The impeller is located between the pressing member and the rotating shaft. An elastic member is also sleeved on the connecting shaft. The elastic member is located between the impeller and the rotating shaft.
[0007] Further, an expansion ring is sleeved on the connecting shaft. The expansion ring is located between the pressing member and the impeller. The expansion coefficient of the expansion ring is greater than or equal to the expansion coefficient of the impeller.
[0008] Further, the elastic member is a compression spring or a disc spring.
[0009] Further, a keyway is opened on the connecting shaft. The impeller is connected to the connecting shaft through a key.
[0010] The technical solutions provided by the embodiments of this application have at least the following technical effects or advantages:
[0011] By installing an elastic member on the side of the impeller away from the pressing member, when the impeller expands due to heat, it can shift away from the pressing member, avoiding scraping between the impeller and the inlet end plate, thereby reducing the operating noise of the oil pump, extending the service life of the oil pump, and ensuring the stable operation of the traction transformer. Description of the Drawings
[0012] The schematic drawings forming a part of this application are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model.
[0013] Figure 1 Is a perspective view of an embodiment of this application;
[0014] Figure 2 Is a structural schematic diagram of an embodiment of this application;
[0015] Figure 3 Is Figure 2 A partial enlarged view of.
[0016] Reference numerals in the drawings: 1, pump housing; 11, base; 12, inlet; 13, outlet; 14, shaft hole; 2, impeller; 3, rotating shaft; 31, connecting shaft; 4, sealing shaft sleeve; 5, pressing member; 6, expansion ring; 7, elastic member. Detailed Embodiments
[0017] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the schematic drawings of the specification and the detailed embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.
[0018] As Figures 1-3 Shown, a traction transformer oil pump for a multiple unit train includes a pump housing 1, an impeller 2, and a rotating shaft 3. The impeller 2 is rotatably installed in the pump housing 1 through the rotating shaft 3. The pump housing 1 is of a volute structure. A base 11 is fixedly welded to the bottom of the pump housing 1. The pump housing 1 is connected to the traction transformer or the multiple unit train through the base 11. An impeller cavity is provided inside the pump housing 1. An inlet 12 is provided on the left end face of the pump housing 1. An outlet 13 is provided on the upper end face of the pump housing 1. A shaft hole 14 is provided on the right end face of the pump housing 1. The inlet 12, the outlet 13, and the shaft hole 14 are all communicated with the impeller cavity.
[0019] As Figure 2 、 Figure 3As shown, the rotating shaft 3 is made of stainless steel. The rotating shaft 3 is rotatably installed at the shaft hole 14 of the pump housing 1 through a sealing shaft sleeve 4. The right end of the rotating shaft 3 is fixedly connected to the output shaft of the motor, and the rotation of the motor drives the rotating shaft 3 to rotate. The left end of the rotating shaft 3 extends into the pump housing 1, and a connecting shaft 31 is fixed to the left end of the rotating shaft 3. The connecting shaft 31 is integrally formed with the rotating shaft 3 and the diameter of the connecting shaft 31 is smaller than that of the rotating shaft 3.
[0020] As Figure 2 , Figure 3 shown, the impeller 2 is sleeved on the connecting shaft 31. An expansion ring 6 is installed on the left side of the impeller 2, and an elastic member 7 is installed on the right side of the impeller 2. Both the expansion ring 6 and the elastic member 7 are sleeved on the connecting shaft 31. A pressing member 5 is installed at the left end of the connecting shaft 31. The pressing member 5 is installed at the end of the connecting shaft 31 through bolts to press the expansion ring 6, the impeller 2 and the elastic member 7 on the connecting shaft 31.
[0021] Among them, a keyway is provided on the connecting shaft 31, and the impeller 2 is in transmission connection with the connecting shaft through a key, so as to prevent the impeller 2 from rotating relative to the connecting shaft 31. The expansion coefficient of the expansion ring 6 is greater than or equal to that of the impeller 2. Preferably, the expansion ring 6 and the impeller 2 are made of the same material. The elastic member 7 is a compression spring or a disc spring, and the elastic coefficient of the elastic member 7 should meet the working requirements of the impeller 2 to prevent the impeller 2 from vibrating during operation.
[0022] The working principle of the embodiment of the present application is as follows:
[0023] When the oil pump is working, as the temperature rises, the expansion ring 6 thermally expands and pushes the impeller 2 to the right, causing the impeller 2 to move to the right, thereby compensating for the gap reduced by the thermal expansion of the impeller 2, preventing the impeller 2 from rubbing against the pump body 1 due to thermal expansion, reducing the operating noise of the oil pump, extending the service life of the oil pump, and ensuring the stable operation of the traction transformer.
[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.
[0025] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A traction transformer oil pump for multiple unit trains, comprising a pump housing, an impeller and a rotating shaft. The rotating shaft is rotatably mounted on the pump housing through a sealing shaft sleeve. One end of the rotating shaft extending into the pump housing is fixed with a connecting shaft, the diameter of the connecting shaft is smaller than that of the rotating shaft, one end of the connecting shaft is provided with a pressing member, the impeller is sleeved on the connecting shaft, and the impeller is located between the pressing member and the rotating shaft, characterized in that, An elastic member is also sleeved on the connecting shaft, and the elastic member is located between the impeller and the rotating shaft.
2. The oil pump of the traction transformer of the multiple unit train according to claim 1, characterized in that, An expansion ring is sleeved on the connecting shaft, the expansion ring is located between the pressing member and the impeller, and the expansion coefficient of the expansion ring is greater than or equal to the expansion coefficient of the impeller.
3. The oil pump for the traction transformer of the multiple unit train according to claim 1, characterized in that, The elastic member is a compression spring or a disc spring.
4. A traction transformer oil pump for a multiple unit train according to claim 2, characterized in that, A keyway is formed on the connecting shaft, and the impeller is connected to the connecting shaft through a key.