Mining flame-proof type three-stage step-by-step speed-increasing axial-flow type local fan

Abstract

The invention relates to a mining flame-proof type three-stage step-by-step speed-increasing axial-flow type local fan, and belongs to the technical field of coal mine safety. Compared with a traditional counter-rotating axial-flow type local fan, an output shaft of a motor is directly connected with a transmission system, and the fan is provided with three-stage impellers, only one motor needs to be arranged, and the production and manufacturing cost is reduced; meanwhile, due to the specific combination of fixed bevel gear transmission and non-fixed bevel gear transmission in a transmission system, the air volume and the pressure can be much larger than those of a transmission single-stage axial-flow type local ventilator; furthermore, the number of teeth on the fixed bevel gear, the bevel gear on the impeller and the transmission bevel gear set can be changed, and different speed increasing combinations can be obtained through adjustment. For example, when the tooth number of the fixed bevel gear and the bevel gear on the impeller is 2n, and the tooth number of the transmission bevel gear set is n, the rotating speed of the three-stage impeller can be eight times that of the output shaft of the motor. According to the invention, the technical improvement is very strong, which is not possessed by the traditional counter-rotating or single-stage axial-flow type local fan at present.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine safety, and relates to an explosion-proof axial flow local ventilator with three-stage step-by-step speed increase for mine use. Background Art

[0002] During the coal mining process, with the excavation of underground roadways, local ventilators are required to supply air to the underground excavation working face, so as to ensure the normal breathing of workers and meet the requirements of dust prevention and gas discharge. With the development of science and technology, in coal mines, counter-rotating axial flow or single-stage axial flow ventilators are mainly used to "press" fresh air flow into the excavation working face through air ducts. This type of local ventilator has a compact structure. The YBF3 type motor is placed in the flow channel, and then the shaft of the motor is directly connected to the impeller. Then, with the rotation of the motor, an air flow is formed. However, with the rapid development of the current underground roadway excavation technology in coal mines, many large-scale mines have adopted advanced fully mechanized excavation, excavation-anchoring integrated or continuous mining technologies. The application of this technology has greatly improved the excavation efficiency, but at the same time, it has also reduced the space of the excavation roadway section. This has forced the local ventilators underground to have the attributes of "small volume", "large air volume" and "high pressure". However, due to the structure of the current counter-rotating axial flow or single-stage axial flow, when the impeller diameter is reduced, the air volume and pressure will inevitably be reduced. Therefore, the application of advanced excavation technology equipment has formed an irreconcilable contradiction with the conventional local ventilation technology in coal mines. Especially when sending air over a long distance, this problem is extremely prominent. In addition, due to the traditional single-stage axial flow local ventilator adopting the method of placing the motor inside and the form of directly connecting the output shaft of the motor to the impeller, the actual rotation speed of the impeller is a constant value of the rotation speed of the motor. It is difficult for this type of ventilator structure to meet the attribute requirement of "high pressure". At present, although some manufacturers have adopted the ventilator structure with double impellers arranged before and after the motor, certain application effects have been achieved in replacing the aerodynamic performance of the adjacent larger-sized ventilator. However, compared with the aerodynamic performance of the larger-sized counter-rotating axial flow ventilator, the improvement range is still limited. Therefore, there is an urgent need for an axial flow local ventilator that can solve the above problems. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an explosion-proof axial flow local ventilator with three-stage step-by-step speed increase for mine use.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] An explosion-proof axial flow local ventilator with three-stage step-by-step speed increase for mine use, comprising a YBF type explosion-proof three-phase asynchronous motor, a machine shell, a collector assembly, an outlet diffuser silencer, an impeller group and a transmission system;

[0006] The transmission system includes a first transmission bevel gear set, a first fixed bevel gear, a second transmission bevel gear set, a second fixed bevel gear, a third transmission bevel gear set, and a third fixed bevel gear;

[0007] The impeller group includes a first-stage impeller, a second-stage impeller, and a third-stage impeller;

[0008] The first fixed bevel gear, the second fixed bevel gear, and the third fixed bevel gear are fixedly arranged in parallel in the casing through a support frame;

[0009] Each of the first transmission bevel gear set, the second transmission bevel gear set, and the third transmission bevel gear set consists of a fixed shaft and two bevel gears, and the two bevel gears are oppositely arranged at both ends of the fixed shaft;

[0010] The output shaft of the YBF type explosion-proof three-phase asynchronous motor is vertically connected to the center of the fixed shaft of the first transmission bevel gear set;

[0011] The two gears of the first transmission bevel gear set are meshed with the first fixed bevel gear; the two gears of the second transmission bevel gear set are meshed with the second fixed bevel gear; the two gears of the third transmission bevel gear set are meshed with the third fixed bevel gear;

[0012] The first-stage impeller is vertically and fixedly connected to the center of the fixed shaft of the second transmission bevel gear set, and the center of the first-stage impeller is a bevel gear meshed with the two gears of the first transmission bevel gear set;

[0013] The second-stage impeller is vertically and fixedly connected to the center of the fixed shaft of the third transmission bevel gear set, and the center of the second-stage impeller is a bevel gear meshed with the two gears of the second transmission bevel gear set;

[0014] The third-stage impeller is arranged on the support frame, and the center of the third-stage impeller is a bevel gear meshed with the two gears of the third transmission bevel gear set;

[0015] The collector assembly is arranged at the inlet end of the casing, and the outlet diffuser silencer is arranged at the outlet end of the casing.

[0016] Furthermore, the number of teeth of the bevel gear at the center of the first-stage impeller is the same as that of the first fixed bevel gear, the number of teeth of the bevel gear at the center of the second-stage impeller is the same as that of the second fixed bevel gear, and the number of teeth of the bevel gear at the center of the third-stage impeller is the same as that of the third fixed bevel gear.

[0017] Furthermore, the number of teeth of the two gears of the first transmission bevel gear set is half of the number of teeth of the first fixed bevel gear, the number of teeth of the two gears of the second transmission bevel gear set is half of the number of teeth of the second fixed bevel gear, and the number of teeth of the two gears of the third transmission bevel gear set is half of the number of teeth of the third fixed bevel gear.

[0018] Furthermore, the support frame includes a first cross support frame, a second cross support frame, a third cross support frame, and a fourth cross support frame; the first cross support frame is used to fix the first fixed bevel gear; the second cross support frame is used to fix the second fixed bevel gear; the third cross support frame is used to fix the third fixed bevel gear; a hole is provided in the center of the fourth cross support frame for fixing the three-stage impeller and enabling the three-stage impeller to rotate on the fourth cross support frame.

[0019] Furthermore, the YBF type explosion-proof three-phase asynchronous motor is placed inside the flow channel of the local ventilator and is fixed by a first fixing frame and a second fixing frame provided inside the flow channel.

[0020] Furthermore, support feet are provided at the bottom of the housing.

[0021] Furthermore, a perforated plate is provided on the inner wall of the outlet end of the housing, and sound-absorbing cotton is provided.

[0022] Furthermore, the housing has two sections, the outlet diffuser silencer is arranged in one section, and other components are arranged in the other section; the two sections of the housing are fastened by means of connecting flanges and bolts.

[0023] The beneficial effects of the present invention are as follows:

[0024] (1) For the mine explosion-proof three-stage step-by-step speed-increasing axial local ventilator provided by the present invention, the output shaft of its supporting motor is directly connected to the transmission system, and it is equipped with three-stage impellers. Compared with the traditional counter-rotating axial local ventilator, only 1 motor needs to be configured, reducing the production and manufacturing costs; in addition, the unique three-stage step-by-step speed-increasing transmission structure ensures the step-by-step speed increase of the three-stage impellers, greatly increasing the air supply pressure of the local ventilator of the same model number, and having extremely obvious technical benefits;

[0025] (2) For the mine explosion-proof three-stage step-by-step speed-increasing axial local ventilator provided by the present invention, compared with the traditional single-stage axial local ventilator with its unique three-stage step-by-step speed-increasing transmission structure, not only the number of impellers is increased, but also due to the combination of the unique fixed and non-fixed bevel gear transmissions in the transmission system, its air volume and pressure can be much greater than those of the traditional single-stage axial local ventilator;

[0026] (3) For the mine explosion-proof three-stage step-by-step speed-increasing axial local ventilator provided by the present invention, it has strong adaptability to transformation. The number of teeth on the fixed bevel gear, the bevel gear on the impeller, and the transmission bevel gear set can be changed to adjust different speed-increasing combinations.

[0027] For example: When the number of teeth of the fixed bevel gear and the bevel gear on the impeller is 2n, and the number of teeth on the transmission bevel gear set is n, the rotational speed of the three-stage impeller can be 8 times that of the output shaft of the motor. In other words, the technical transformation of the present invention is extremely strong, which is not possessed by the current traditional counter-rotating or single-stage axial local ventilators.

[0028] Other advantages, objectives, and features of the present invention will, to some extent, be described in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on an examination of the following text, or can be learned from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0030] Figure 1 It is a schematic structural diagram of a mine explosion-proof three-stage step-by-step speed-increasing axial local ventilator.

[0031] Reference numerals: YBF explosion-proof three-phase asynchronous motor 1, housing 2, collector assembly 3, outlet diffuser silencer 4, first fixing bracket 5, second fixing bracket 6, output shaft 7, first fixed bevel gear 8, second fixed bevel gear 9, third fixed bevel gear 10, first transmission bevel gear set 11, second transmission bevel gear set 12, third transmission bevel gear set 13, first-stage impeller 14, second-stage impeller 15, third-stage impeller 16, first cross support 17, second cross support 18, third cross support 19, fourth cross support 20, support feet 21, earthing bolt 22, perforated plate 23, sound-absorbing cotton 24, connecting flange 25, bolt 26. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention schematically. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0033] Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the attached drawings are omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0034] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached 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 orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] Embodiment 1:

[0036] The present invention provides a new type of mine explosion-proof axial local ventilator with three-stage step-by-step speed increase, which includes a YBF-type explosion-proof three-phase asynchronous motor 1, a housing 2, an inlet collector assembly 3, an outlet diffuser muffler 4, an impeller group and a transmission system;

[0037] The transmission system includes a first transmission bevel gear set 11 and a first fixed bevel gear 8, a second transmission bevel gear set 12, a second fixed bevel gear 9, a third transmission bevel gear set 13, and a third fixed bevel gear 10;

[0038] The impeller group includes a first-stage impeller 14, a second-stage impeller 15 and a third-stage impeller 16;

[0039] The first fixed bevel gear 8, the second fixed bevel gear 9 and the third fixed bevel gear 10 are fixedly arranged in parallel in the housing through a support frame;

[0040] Each of the first transmission bevel gear set 11, the second transmission bevel gear set 12 and the third transmission bevel gear set 13 consists of a fixed shaft and two bevel gears, and the two bevel gears are oppositely arranged at both ends of the fixed shaft;

[0041] The output shaft of the YBF-type explosion-proof three-phase asynchronous motor is vertically connected to the center of the fixed shaft of the first transmission bevel gear set 11;

[0042] The two gears of the first transmission bevel gear set 11 are meshed with the first fixed bevel gear 8; the two gears of the second transmission bevel gear set 12 are meshed with the second fixed bevel gear 9; the two gears of the third transmission bevel gear set 13 are meshed with the third fixed bevel gear 10;

[0043] The first-stage impeller 14 is vertically and fixedly connected to the central axis of the fixed shaft of the second transmission bevel gear set 12. The center of the first-stage impeller 14 is a bevel gear that meshes with the two gears of the first transmission bevel gear set 11.

[0044] The second-stage impeller 15 is vertically and fixedly connected to the central axis of the fixed shaft of the third transmission bevel gear set 13. The center of the second-stage impeller 15 is a bevel gear that meshes with the two gears of the second transmission bevel gear set 12.

[0045] The third-stage impeller 16 is arranged on the support frame. The center of the third-stage impeller 16 is a bevel gear that meshes with the two gears of the third transmission bevel gear set 13.

[0046] The collector assembly is arranged at the inlet end of the casing, and the outlet diffuser silencer is arranged at the outlet end of the casing.

[0047] Optionally, the number of teeth of the bevel gear at the center of the first-stage impeller 14 is the same as that of the first fixed bevel gear 8. The number of teeth of the bevel gear at the center of the second-stage impeller 15 is the same as that of the second fixed bevel gear 9. The number of teeth of the bevel gear at the center of the third-stage impeller 16 is the same as that of the third fixed bevel gear 10.

[0048] Optionally, the number of teeth of the two gears of the first transmission bevel gear set 11 is half of the number of teeth of the first fixed bevel gear 8. The number of teeth of the two gears of the second transmission bevel gear set 12 is half of the number of teeth of the second fixed bevel gear 9. The number of teeth of the two gears of the third transmission bevel gear set 13 is half of the number of teeth of the third fixed bevel gear 10.

[0049] Optionally, the support frame includes a first cross support frame 17, a second cross support frame 18, a third cross support frame 19, and a fourth cross support frame 20. The first cross support frame 17 is used to fix the first fixed bevel gear 8. The second cross support frame 18 is used to fix the second fixed bevel gear 9. The third cross support frame 19 is used to fix the third fixed bevel gear 10. The center of the fourth cross support frame 20 is provided with a hole for fixing the third-stage impeller 16 and enabling the third-stage impeller 16 to rotate on the fourth cross support frame.

[0050] Optionally, the YBF type explosion-proof three-phase asynchronous motor is placed in the flow channel of the local ventilator and fixed by the first fixing frame 5 and the second fixing frame 6 arranged in the flow channel.

[0051] Optionally, support feet 21 are arranged at the bottom of the casing.

[0052] Optionally, a perforated plate 23 is arranged on the inner wall of the outlet end of the casing, and sound-absorbing cotton 24 is arranged.

[0053] Optionally, the casing has two sections. The outlet diffuser silencer is arranged in one section, and other components are arranged in the other section. The two sections of the casing are fastened by means of connecting flanges 25 and bolts 26.

[0054] Example 2:

[0055] As Figure 1 shown, the present invention provides a new type of explosion-proof axial local ventilator with three-stage progressive speed increase, which mainly consists of the following parts: a YBF type explosion-proof three-phase asynchronous motor 1, a casing 2, a collector assembly 3, an outlet diffuser silencer 4, a support foot 21, an impeller group and a transmission system.

[0056] The YBF type explosion-proof three-phase asynchronous motor 1 is placed in the flow channel of the local ventilator, and is fixed by a first fixing frame 5 and a second fixing frame 6 arranged in the flow channel; the output shaft 7 of the YBF type explosion-proof three-phase asynchronous motor is directly connected to the first transmission bevel gear set 11.

[0057] The first transmission bevel gear set 11, the first fixed bevel gear 8, the second transmission bevel gear set 12, the second fixed bevel gear 9, the third transmission bevel gear set 13, the third fixed bevel gear 10, the first-stage impeller 14, the second-stage impeller 15, the third-stage impeller 16, the first cross support frame 17, the second cross support frame 18, the third cross support frame 19, and the fourth cross support frame 20 form a transmission system.

[0058] During the operation of the ventilator, the first fixed bevel gear 8 remains stationary, and its function is to provide a meshing track for the rotational movement of the first transmission bevel gear set 11 and transmit the rotational movement of the motor output shaft to the first-stage impeller.

[0059] The first-stage impeller 14 and the second transmission bevel gear set 12 are of an integrated structure, with a bevel gear at its center, and the number of teeth is the same as that of the first fixed bevel gear 8. The bevel gear provided on the first-stage impeller 14 is equivalent to a hub, and blades can be provided at the edge of the first-stage impeller 14.

[0060] During the operation of the ventilator, the second fixed bevel gear 9 remains stationary, and its function is to provide a meshing track for the rotational movement of the second transmission bevel gear set 12 and transmit the rotational movement of the first-stage impeller 14 to the second-stage impeller 15.

[0061] The second-stage impeller 15 and the third transmission bevel gear set 13 are of an integrated structure, with a bevel gear at its center, and the number of teeth is the same as that of the second fixed bevel gear 9. The bevel gear provided on the second-stage impeller is equivalent to a hub, and blades can be provided at the edge of the second-stage impeller 15.

[0062] During the operation of the ventilator, the third fixed bevel gear 10 remains stationary, and its function is to provide a meshing track for the rotational movement of the third transmission bevel gear set 13 and transmit the rotational movement of the second-stage impeller to the third-stage impeller 16.

[0063] The center of the three-stage impeller 16 is a bevel gear, and the number of teeth is the same as that of the third fixed bevel gear 10. The bevel gear provided on the three-stage impeller 16 is equivalent to a hub, and blades can be provided on the edge of the three-stage impeller 16.

[0064] Embodiment 3:

[0065] In this embodiment, the structures of the first transmission bevel gear set 11, the second transmission bevel gear set 12, and the third transmission bevel gear set 13 are the same, and the number of teeth is half of that of the first fixed bevel gear 8; the number of teeth of the second transmission bevel gear set 12 is half of that of the second fixed bevel gear 9; the number of teeth of the third transmission bevel gear set 13 is half of that of the third fixed bevel gear 10.

[0066] The first fixed bevel gear 8, the second fixed bevel gear 9, the third fixed bevel gear 10, the first cross support frame 17, the second cross support frame 18, the third cross support frame 19, and the fourth cross support frame 20 are of an integrated structure;

[0067] Support feet 21 and earthing bolts 22 are also provided at the bottom of the casing of the new type of mine explosion-proof three-stage axial local ventilator with step-by-step speed increase, and a perforated plate 23 is provided on the inner wall of the casing at the outlet end, and a certain number of sound-absorbing cotton 24 is provided.

[0068] The casing part with an outlet silencer and the casing part containing the motor and the transmission system are fastened by means of connection flanges 25 and bolts 26.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An explosion-proof axial local ventilator with three-stage step-by-step speed increase for mine use, characterized in that: It includes a YBF type explosion-proof three-phase asynchronous motor, a casing, a collector assembly, an outlet diffuser silencer, an impeller group and a transmission system; The transmission system includes a first transmission bevel gear set and a first fixed bevel gear, a second transmission bevel gear set, a second fixed bevel gear, a third transmission bevel gear set, and a third fixed bevel gear; The impeller group includes a first-stage impeller, a second-stage impeller and a third-stage impeller; The first fixed bevel gear, the second fixed bevel gear and the third fixed bevel gear are fixedly arranged in parallel in the casing through a support frame; Each of the first transmission bevel gear set, the second transmission bevel gear set and the third transmission bevel gear set consists of a fixed shaft and two bevel gears, and the two bevel gears are oppositely arranged at both ends of the fixed shaft; The output shaft of the YBF type explosion-proof three-phase asynchronous motor is vertically connected to the center of the fixed shaft of the first transmission bevel gear set; The two gears of the first transmission bevel gear set are meshed with the first fixed bevel gear; the two gears of the second transmission bevel gear set are meshed with the second fixed bevel gear; the two gears of the third transmission bevel gear set are meshed with the third fixed bevel gear; The first-stage impeller is vertically and fixedly connected to the center of the fixed shaft of the second transmission bevel gear set, and the center of the first-stage impeller is a bevel gear meshed with the two gears of the first transmission bevel gear set; The second-stage impeller is vertically and fixedly connected to the center of the fixed shaft of the third transmission bevel gear set, and the center of the second-stage impeller is a bevel gear meshed with the two gears of the second transmission bevel gear set; The third-stage impeller is arranged on the support frame, and the center of the third-stage impeller is a bevel gear meshed with the two gears of the third transmission bevel gear set; The collector assembly is arranged at the inlet end of the casing, and the outlet diffuser silencer is arranged at the outlet end of the casing.

2. The axial local ventilator with explosion isolation and three-stage step-by-step speed increase according to claim 1, characterized in that: The number of teeth of the bevel gear at the center of the first-stage impeller is the same as that of the first fixed bevel gear, the number of teeth of the bevel gear at the center of the second-stage impeller is the same as that of the second fixed bevel gear, and the number of teeth of the bevel gear at the center of the third-stage impeller is the same as that of the third fixed bevel gear.

3. The axial local ventilator with explosion-proof and three-stage step-by-step speed increase according to claim 1, characterized in that: The number of teeth of the two gears of the first transmission bevel gear set is half of the number of teeth of the first fixed bevel gear, the number of teeth of the two gears of the second transmission bevel gear set is half of the number of teeth of the second fixed bevel gear, and the number of teeth of the two gears of the third transmission bevel gear set is half of the number of teeth of the third fixed bevel gear.

4. The axial local ventilator with explosion isolation and three-stage progressive speed increase for mine use according to claim 1, characterized in that: The support frame includes a first cross support frame, a second cross support frame, a third cross support frame, and a fourth cross support frame; the first cross support frame is used to fix the first fixed bevel gear; the second cross support frame is used to fix the second fixed bevel gear; the third cross support frame is used to fix the third fixed bevel gear; a hole is provided at the center of the fourth cross support frame for fixing the third-stage impeller and enabling the third-stage impeller to rotate on the fourth cross support frame.

5. The axial local ventilator with explosion isolation and three-stage step-by-step speed increase according to claim 1, characterized in that: The YBF type explosion-proof three-phase asynchronous motor is placed in the flow channel of the local ventilator and is fixed by a first fixing frame and a second fixing frame arranged in the flow channel.

6. The axial local ventilator with explosion-proof and three-stage step-by-step speed increase according to claim 1, characterized in that: Support feet are arranged at the bottom of the casing.

7. The axial local ventilator with explosion isolation and three-stage step-by-step speed increase according to claim 1, characterized in that: A perforated plate is arranged on the inner wall of the outlet end of the casing, and sound-absorbing cotton is arranged.

8. The axial local ventilator with explosion-proof and three-stage step-by-step speed increase according to claim 1, characterized in that: The casing has two sections, and the outlet diffuser silencer is arranged in one section, while other components are arranged in the other section; the two sections of the casing are fastened by means of connecting flanges and bolts.

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