Cooling fan for air conditioning unit of high-speed motor train unit

Abstract

The utility model relates to the technical field of cooling fans, and solves the problem of high maintenance cost of an imported outer rotor centrifugal fan. The utility model particularly relates to a cooling fan for an air conditioning unit of a high-speed motor train unit. A cooling fan for an air conditioning unit of a high-speed motor train unit comprises a rack installed on the air conditioning unit, a volute for building a ventilation inner cavity is arranged on the rack, a multi-wing centrifugal impeller set is arranged in the volute, and air inlet channels are formed in the two ends of the multi-wing centrifugal impeller set. The multi-wing centrifugal impeller set comprises a left impeller and a right impeller which are installed in the volute in a bilateral symmetry mode, the left impeller and the right impeller are the same in structure and each comprise a front wheel disc and a rear wheel disc which form the outline of the impeller, a plurality of blades are arranged between the front wheel disc and the rear wheel disc, and the blades are arranged in an arc shape. Buckle pieces buckled with the front wheel disc and the rear wheel disc are arranged at the left ends and the right ends of the blades, and semicircular pressure relief groove structures are arranged at the joints of the roots of the buckle pieces and the blade base bodies.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling fans, in particular to a cooling fan for an air conditioning unit of a high-speed train set. Background Art

[0002] EMUs, locomotives and vehicles with different purposes at home and abroad have air conditioning units in their passenger compartments or driver's cabs, so cooling fans are needed to dissipate heat from the air conditioning units. The cooling fans configured for the air conditioning units of high-speed EMUs are imported external rotor centrifugal fans, which have a series of problems during maintenance, such as difficulty in maintenance, high cost, and long parts procurement cycle. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model provides a cooling fan for an air-conditioning unit of a high-speed train, which solves the problem of high maintenance cost of imported outer rotor centrifugal fans.

[0004] To achieve the above object, the utility model provides the following technical solutions: A cooling fan for a high-speed train air conditioning unit, comprising a frame mounted on the air conditioning unit, a volute for establishing a ventilation cavity is provided on the frame, a multi-blade centrifugal impeller group is provided in the volute, and air inlets are provided at both ends of the multi-blade centrifugal impeller group;

[0005] The multi-blade centrifugal impeller assembly includes a left impeller and a right impeller symmetrically installed in the volute, and the left impeller and the right impeller have the same structure and both include a front wheel disc and a rear wheel disc forming the impeller outline, and a plurality of blades are arranged between the front wheel disc and the rear wheel disc;

[0006] The blade is arranged in an arc shape, and buckles are arranged at both left and right ends of the blade to be buckled with the front wheel disc and the rear wheel disc, and the connection between the root of the buckle and the blade base is arranged as a semicircular pressure relief groove structure.

[0007] In one embodiment, the air inlet duct includes a shell, an air inlet channel and an air guide section are provided inside the shell, an air overflow channel is connected to the rear end of the air guide section, and a gap is provided between the air overflow channel and the front wheel disc;

[0008] The diameter of the air inlet channel is larger than the diameter of the air guide section, and the diameter of the overflow channel is larger than the diameter of the air guide section but smaller than the diameter of the air inlet channel.

[0009] In one embodiment, an outer rotor motor is arranged between the left impeller and the right impeller, and the left and right ends of the central shaft box of the outer rotor motor extend and connect the left impeller and the right impeller, and the extension end position of the central shaft of the outer rotor motor is located at the installation position of the frame.

[0010] In one embodiment, the volute includes two bilaterally symmetrical side plates, a spiral top plate is connected between the two side plates, the top plate and the side plates spiral in the same direction and an air outlet flange is provided at the front end.

[0011] In one embodiment, the buckle piece is connected to the blade in an L-shape, and the pressure relief grooves are arranged at both ends of the buckle piece.

[0012] In one embodiment, the front wheel disc and the rear wheel disc are provided with slots having a width equal to that of the cleat, and the cleat extends outward and fits against the outside of the front wheel disc and the rear wheel disc.

[0013] Compared with the prior art, the utility model provides a cooling fan for a high-speed train air conditioning unit, which has the following beneficial effects:

[0014] In the technical solution disclosed by the utility model, the end of the air inlet duct is connected with the front wheel disc and a certain gap is retained in the axial direction of the motor. The gap can reduce the air leakage loss and the vortex generated by the leakage, thereby ensuring the high efficiency and low noise characteristics of the fan. On the other hand, the cross-sectional trend of the air inlet duct is from large to small, so that the air flowing through the air inlet duct will have an acceleration process, while avoiding the inlet impact loss and intake vortex caused by the airflow entering the impeller vertically.

[0015] By spirally arranging the top plate and the side plates of the volute in the same direction, the inner cavity thereof forms a spiral shape which gradually increases from small to large, and the dynamic pressure of the airflow from the impeller outlet can be effectively converted into the static pressure of the fan, thereby improving the working capacity of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the left structure of the impeller of the utility model;

[0020] Figure 4 This is a schematic diagram of the volute structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the air inlet structure of the utility model;

[0022] Figure 6 This is a schematic diagram of the blade structure of the utility model.

[0023] In the figure: 1. frame; 2. volute; 21. side panel; 22. top panel; 23. air outlet flange; 3. multi-blade centrifugal impeller assembly; 31. left impeller; 32. right impeller; 33. front wheel disc; 34. rear wheel disc; 35. blades; 36. buckle; 37. pressure relief groove; 4. air inlet duct; 41. casing; 42. air inlet channel; 43. air guide section; 44. overflow channel; 5. outer rotor motor. DETAILED DESCRIPTION

[0024] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] At present, EMUs, locomotives and vehicles with different purposes at home and abroad have air conditioning units in their passenger compartments or driver's cabs, so cooling fans are needed to dissipate heat from the air conditioning units. The cooling fan configured for the air conditioning unit of a high-speed EMU is an imported outer rotor centrifugal fan. This type of fan has a series of problems during maintenance, such as difficulty in maintenance, high cost, and long parts procurement cycle. At present, in order to consolidate the supply chain of cooling fans for EMU air conditioning units, it is required to provide a cooling fan for high-speed EMU air conditioning units to solve the above problems.

[0027] like Figure 1-Figure 6 As described, the cooling fan disclosed in this scheme is fixed inside the cabinet of the air-conditioning unit through the volute 2 frame 1, and the frame 1 is provided with a volute 2 for establishing a ventilation cavity, and a multi-blade centrifugal impeller group 3 is provided inside the volute 2, and an air inlet 4 is provided at both ends of the multi-blade centrifugal impeller group 3, and the air inlet 4 is directly connected to the air outside the air-conditioning unit, and the air outlet is connected to the unit pipeline. When the fan is working, it inhales the external cold air, and the hot air around the unit is discharged into the air outlet pipeline, and finally discharged to the atmosphere, so as to achieve the purpose of cooling the air-conditioning unit.

[0028] like Figure 2-Figure 3As shown, the multi-blade centrifugal impeller group 3 includes a left impeller 31 and a right impeller 32 which are symmetrically installed in the volute 2. The left impeller 31 and the right impeller 32 have the same structure and both include a front wheel disc 33 and a rear wheel disc 34 that constitute the impeller contour. 38 blades 35 are arranged between the front wheel disc 33 and the rear wheel disc 34. The front wheel disc 33 and the rear wheel disc 34 are made of 0.75mm thick galvanized steel plate, and the front wheel disc 33 and the rear wheel disc 34 are made of 1.5mm thick galvanized steel plate. The entire impeller is roll-formed by a thin plate structure, which has the advantages of high rigidity, small deformation and light weight. At the same time, this is beneficial to prolonging the life of the outer rotor motor 5 that drives it to rotate.

[0029] like Figure 6 As shown, the blade 35 is arranged in an arc shape, and buckles 36 are arranged at both ends of the blade 35 to buckle with the front wheel disc 33 and the rear wheel disc 34. The root of the buckle 36 and the connection between the base of the blade 35 are arranged as a semicircular pressure relief groove 37 structure, and the pressure relief groove 37 is arranged at both ends of the buckle 36. Figure 6 As shown, the clip 36 is connected to the blade 35 in an L-shape, and a slot having the same width as the clip 36 is opened on the front wheel disc 33 and the rear wheel disc 34. The clip 36 extends outward and is attached to the outside of the front wheel disc 33 and the rear wheel disc 34 through a rolling process.

[0030] like Figure 5 As shown, the air inlet duct 4 includes a shell 41, an air inlet channel 42 and an air guide section 43 are provided inside the shell 41, an overflow channel 44 is connected to the rear end of the air guide section 43, and a gap is provided between the overflow channel 44 and the front wheel disc 33. The diameter of the air inlet channel 42 is larger than the diameter of the air guide section 43, and the diameter of the overflow channel 44 is larger than the diameter of the air guide section 43 but smaller than the diameter of the air inlet channel 42. Based on the arrangement of the air inlet channel 42, the air guide section 43 and the overflow channel 44, a change trend of the cross-sectional diameter of the overall air inlet duct 4 is formed from large to small and then to large, so that the air flowing through the air inlet duct 4 will have an acceleration process, while avoiding the inlet impact loss and intake vortex caused by the airflow vertically entering the multi-blade centrifugal impeller group 3.

[0031] An outer rotor motor 5 is arranged between the left impeller 31 and the right impeller 32. The left and right ends of the central shaft box of the outer rotor motor 5 extend and connect the left impeller 31 and the right impeller 32. The end position of the extension of the central axis of the outer rotor motor 5 is located at the installation position of the frame 1. It is an outer rotor three-phase AC asynchronous motor. As the driving force for the operation of the cooling fan, its working state changes the speed and switches between high and low speeds according to the heat dissipation needs of the air-conditioning unit. The internal insulating material used is all anti-corona material, which ensures that the winding is not affected by corona during operation. The structure is compact, and the outer rotor motor 5 is installed as a whole inside the cavity of the volute 2, thereby improving the heat dissipation performance of the outer rotor motor 5. The design scheme is reasonable, and the noise is smaller than that of motors of the same power, especially the electromagnetic noise is smaller. Its resistance is smaller than that of traditional asynchronous motors, and the loss is less, and the manufacturing cost is correspondingly reduced.

[0032] The volute 2 includes two symmetrical side plates 21, a spiral top plate 22 is connected between the two side plates 21, the top plate 22 and the side plates 21 spiral in the same direction and an air outlet flange 23 is opened at the front end, the top plate 2242 of the volute 2 is made of a stainless steel plate with a thickness of only 0.8 mm, the side plate 2141 and the air outlet flange 2343 are both made of a stainless steel plate with a thickness of 2 mm, and the frame 144 is made of a stainless steel plate with a thickness of 3 mm. All parts are welded by laser, so that the volute 2 has the characteristics of being beautiful, non-deformed and light in weight. The inner cavity profile of the volute 2 is designed to be a spiral shape from small to large, which can effectively convert the dynamic pressure of the airflow from the outlet of the impeller left 31 and the impeller right 32 into the static pressure of the fan, thereby improving the working capacity of the fan.

[0033] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0034] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cooling fan for a high-speed train air conditioning unit, comprising a frame (1) mounted on the air conditioning unit, characterized in that: The frame (1) is provided with a volute (2) for establishing a ventilation inner cavity, a multi-blade centrifugal impeller group (3) is provided in the volute (2), and air inlet ducts (4) are provided at both ends of the multi-blade centrifugal impeller group (3); The multi-blade centrifugal impeller assembly (3) comprises a left impeller (31) and a right impeller (32) which are symmetrically installed in the volute (2). The left impeller (31) and the right impeller (32) have the same structure and both comprise a front wheel disc (33) and a rear wheel disc (34) forming the impeller profile. A plurality of blades (35) are arranged between the front wheel disc (33) and the rear wheel disc (34). The blade (35) is arranged in an arc shape, and buckle plates (36) are arranged at both left and right ends of the blade (35) to be buckled with the front wheel disc (33) and the rear wheel disc (34). A semicircular pressure relief groove (37) structure is arranged at the connection between the root of the buckle plate (36) and the base of the blade (35).

2. The cooling fan for a high-speed train air conditioning unit according to claim 1, characterized in that: The air inlet duct (4) comprises a shell (41), an air inlet channel (42) and an air guide section (43) are provided inside the shell (41), an air overflow channel (44) is connected to the rear end of the air guide section (43), and a gap is provided between the air overflow channel (44) and the front wheel disc (33); The diameter of the air inlet channel (42) is larger than the diameter of the air guide section (43), and the diameter of the air overflow channel (44) is larger than the diameter of the air guide section (43) but smaller than the diameter of the air inlet channel (42).

3. The cooling fan for a high-speed train air conditioning unit according to claim 1, characterized in that: An outer rotor motor (5) is arranged between the left impeller (31) and the right impeller (32); the left and right ends of the central shaft box of the outer rotor motor (5) extend and connect the left impeller (31) and the right impeller (32); and the end position of the extension of the central shaft of the outer rotor motor (5) is located at the installation position of the frame (1).

4. The cooling fan for a high-speed train air conditioning unit according to claim 1, characterized in that: The volute (2) comprises two symmetrical side plates (21), a spiral top plate (22) is connected between the two side plates (21), the top plate (22) and the side plates (21) spiral in the same direction and an air outlet flange (23) is provided at the front end.

5. The cooling fan for a high-speed train air conditioning unit according to claim 1, characterized in that: The buckle piece (36) is connected to the blade (35) in an L-shape, and the pressure relief grooves (37) are arranged at both ends of the buckle piece (36).

6. A cooling fan for a high-speed train air conditioning unit according to claim 1, characterized in that: The front wheel disc (33) and the rear wheel disc (34) are provided with slots having the same width as the setting width of the buckle plate (36), and the buckle plate (36) extends outwards and fits outside the front wheel disc (33) and the rear wheel disc (34).

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