F-type explosion-proof operation motor of electric hoist
By setting the front end cover and seals in the F-type running motor of the electric hoist, an independent sealed explosion-proof cavity is formed, which solves the high heat and electric spark safety hazards of the motor in a flammable and explosive environment, and improves the explosion-proof level and safety performance.
Patent Information
- Application Number
- CN202420998692.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The F-type operating motors of existing electric hoists have safety hazards of high heat and electric spark ignition or detonation in flammable and explosive gas or dust environments, and their explosion-proof performance is insufficient.
An electric hoist F-type explosion-proof operation motor is designed. By setting a front end cover between the running motor and the gear box, and installing a seal and explosion-proof joint between the rotor shaft, the front end cover and the motor barrel, it forms an independent Sealed explosion-proof cavity to limit high heat and electric sparks inside and prevent transmission to the outside.
Effectively isolate the high heat and electric sparks inside the motor, prevent the ignition of flammable and explosive gases or dust, improve the explosion-proof level and safety performance of the electric hoist, reaching the Ex dⅡC T4/T6 Gb level, and providing higher protection Level and power.
Smart Images
Figure CN222262332U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of electric hoists and relates to an F-type flameproof running motor of an electric hoist. Background Art
[0002] The motor of the electric hoist will generate high heat and electric sparks when it is working. When the electric hoist is working in an environment with flammable and explosive gas or dust, the high heat and electric sparks may ignite or detonate the flammable and explosive gas or dust, thus causing serious safety accidents. Although the existing electric hoists also have explosion-proof functions, their safety performance is still poor. In particular, the F-type running motor of the electric hoist, whose motor barrel and gear box are directly connected as one, puts forward higher requirements for explosion-proof performance. Utility Model Content
[0003] In view of the deficiencies in the prior art, the utility model provides an F-type flameproof running motor for an electric hoist, which has a better flameproof effect.
[0004] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:
[0005] An F-type flameproof running motor for an electric hoist comprises a running motor and a gear box distributed in an "F" shape, wherein the running motor comprises a motor barrel and a rotor shaft, wherein the rotor shaft extends into the gear box and is transmission-connected to a gear set therein, a front end cover is arranged between the running motor and the gear box, and the two ends of the front end cover are respectively fixedly connected to the motor barrel and the gear box, a first flameproof joint surface is arranged between the rotor shaft and the front end cover, and a second flameproof joint surface is arranged between the front end cover and the motor barrel, a sealing member sealingly connected to the front end cover is sleeved on the rotor shaft, and the sealing member divides an inner cavity of the gear box and an inner cavity of the running motor into two independent sealed flameproof cavities.
[0006] In the above-mentioned F-type flameproof running motor of an electric hoist, a bearing is arranged between the rotor shaft and the front end cover, the first flameproof joint surface between the rotor shaft and the front end cover is located at the rear side of the bearing, and the seal is located at the front side of the bearing.
[0007] In the above-mentioned F-type flameproof running motor of an electric hoist, the sealing member is an oil seal.
[0008] In the above-mentioned F-type flameproof running motor of an electric hoist, a rear end cover is provided at the rear end of the motor barrel, the rotor shaft extends out of the rear end cover and is sleeved with a brake, the brake outer cover is provided with a brake cover shell fixedly connected to the rear end cover, a first flameproof joint surface is provided between the rotor shaft and the brake cover shell, and a second flameproof joint surface is provided between the motor barrel and the rear end cover, and between the rear end cover and the brake cover shell.
[0009] In the above-mentioned F-type flameproof running motor of an electric hoist, a junction box is connected above the motor barrel, a junction box cover is provided on the junction box top, and a second flameproof joint surface is provided between the junction box and the motor barrel and between the junction box and the junction box cover.
[0010] In the above-mentioned F-type flameproof running motor of an electric hoist, the first flameproof joint surface arranged between the rotor shaft and the front end cover, between the rotor shaft and the brake cover, and the second flameproof joint surface arranged between the front end cover and the motor barrel, between the motor barrel and the rear end cover, and between the rear end cover and the brake cover are all distributed in the horizontal direction; the second flameproof joint surface arranged between the junction box and the motor barrel, and between the junction box and the junction box cover are all distributed in the vertical direction.
[0011] In the above-mentioned F-type flameproof running motor of an electric hoist, the fitting length L of the first flameproof joint surface is ≥17 mm, the fitting clearance ic ≤0.15 mm, and the surface roughness does not exceed 3.2.
[0012] In the above-mentioned F-type flameproof running motor of an electric hoist, the fitting length L of the second flameproof joint surface is ≥17 mm, the fitting clearance ic ≤0.15 mm, and the surface roughness does not exceed 1.6.
[0013] The surface roughness of 3.2 means that the roughness Ra value is 3.2 μm, and the surface roughness of 1.6 means that the roughness Ra value is 1.6 μm.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] The utility model provides an F-type flameproof running motor for an electric hoist, wherein a front end cover is additionally provided between the gear box and the motor barrel to isolate the gear box and the running motor from each other, and a seal is installed in the front end cover to divide the inner cavity of the gear box and the inner cavity of the running motor into two independent sealed flameproof cavities, and explosion-proof joint surfaces are provided between the rotor shaft and the front end cover, and between the front end cover and the motor barrel. Through the above structure, the high heat and electric sparks generated by the motor during operation are confined within the sealed housing and isolated from the outside to prevent ignition of inflammable and explosive gases or dust around the outside of the motor housing. The F-type flameproof running motor for an electric hoist provided by the utility model has an explosion-proof grade of up to Ex dⅡC T4 / T6 Gb, EXtD A21 IP6580℃; a protection grade of up to IP65; and a maximum power of up to 3.8KW. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is an axial cross-sectional view of the utility model;
[0017] Figure 2 yes Figure 1 A partial enlarged view of
[0018] Figure numerals: 1. running motor; 2. gear box; 3. motor barrel; 4. rotor shaft; 5. front end cover; 6. first flameproof joint surface; 7. second flameproof joint surface; 8. seal; 9. bearing; 10. rear end cover; 11. brake; 12. brake cover; 13. junction box; 14. junction box cover. DETAILED DESCRIPTION
[0019] The present invention will be further described below with reference to the accompanying drawings. Figure 1-2 :
[0020] An F-type flameproof running motor for an electric hoist comprises a running motor 1 and a gear box 2 which are distributed in an "F" shape, wherein the running motor 1 comprises a motor barrel 3 and a rotor shaft 4, wherein the rotor shaft 4 extends into the gear box 2 and is transmission-connected to a gear set therein, wherein a front end cover 5 is arranged between the running motor 1 and the gear box 2, wherein both ends of the front end cover 5 are respectively fixedly connected to the motor barrel 3 and the gear box 2, wherein a first flameproof joint surface 6 is arranged between the rotor shaft 4 and the front end cover 5, and a second flameproof joint surface 7 is arranged between the front end cover 5 and the motor barrel 3, wherein a sealing member 8 which is sealingly connected to the front end cover 5 is sleeved on the rotor shaft 4, and wherein the sealing member 8 divides an inner cavity of the gear box 2 and an inner cavity of the running motor 1 into two independent sealed flameproof cavities.
[0021] In view of the structural characteristics of the F-type running motor 1, this embodiment connects the running motor 1 and the gear box 2 by adding a front end cover 5, and uses a seal 8 to divide the inner cavity of the gear box 2 and the inner cavity of the running motor 1 into two independent sealed flameproof cavities, so as to prevent the high heat and electric sparks generated by the running motor 1 during operation from being transmitted to the gear box 2. This embodiment also seals the rotor shaft 4 and the front end cover 5 through a first flameproof joint surface 6, and seals the front end cover 5 and the motor barrel 3 through a second flameproof joint surface 7, so that a sealed cavity isolated from the outside is formed inside the running motor 1.
[0022] In this embodiment, the specific arrangement positions of the seal 8 and the first flameproof joint surface 6 between the rotor shaft 4 and the front end cover 5 are: a bearing 9 is arranged between the rotor shaft 4 and the front end cover 5, the first flameproof joint surface 6 between the rotor shaft 4 and the front end cover 5 is located on the rear side of the bearing 9, and the seal 8 is located on the front side of the bearing 9.
[0023] In this embodiment, the sealing member 8 is an oil seal.
[0024] In order to make the braking system of the running motor 1 also have an explosion-proof effect, the present embodiment further carries out the following arrangements: a rear end cover 10 is provided at the rear end of the motor barrel 3, the rotor shaft 4 extends out of the rear end cover 10 and is sleeved with a brake 11, the outer cover of the brake 11 is provided with a brake cover 12 fixedly connected to the rear end cover 10, a first explosion-proof joint surface 6 is provided between the rotor shaft 4 and the brake cover 12, and a second explosion-proof joint surface 7 is provided between the motor barrel 3 and the rear end cover 10, and between the rear end cover 10 and the brake cover 12.
[0025] This embodiment can also be further applied to a running motor 1 with a junction box 13: a junction box 13 is connected above the motor barrel 3, a junction box cover 14 is provided on the junction box 13, and a second flameproof joint surface 7 is provided between the junction box 13 and the motor barrel 3 and between the junction box 13 and the junction box cover 14.
[0026] Preferably, the first explosion-proof joint surface 6 arranged between the rotor shaft 4 and the front end cover 5 and between the rotor shaft 4 and the brake housing 12, and the second explosion-proof joint surface 7 arranged between the front end cover 5 and the motor barrel 3, between the motor barrel 3 and the rear end cover 10, and between the rear end cover 10 and the brake housing 12 are all distributed in the horizontal direction; the second explosion-proof joint surface 7 arranged between the junction box 13 and the motor barrel 3 and between the junction box 13 and the junction box cover 14 are all distributed in the vertical direction.
[0027] In view of the different arrangement positions of the first flameproof joint surface 6 and the second flameproof joint surface 7, this embodiment adopts different design parameters:
[0028] The fitting length L of the above-mentioned first flameproof joint surface 6 is ≥17 mm, the fitting clearance ic ≤0.15 mm, and the surface roughness does not exceed 3.2.
[0029] The fitting length L of the above-mentioned second flameproof joint surface 7 is ≥17 mm, the fitting clearance ic ≤0.15 mm, and the surface roughness does not exceed 1.6.
[0030] The surface roughness of 3.2 means that the roughness Ra value is 3.2 μm, and the surface roughness of 1.6 means that the roughness Ra value is 1.6 μm.
[0031] The first flameproof joint surface 6 and the second flameproof joint surface 7 designed with the above parameters can better seal the interior of the running motor 1, thereby obtaining the best explosion-proof effect.
[0032] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. An F-type flameproof running motor for an electric hoist, comprising a running motor (1) and a gear box (2) arranged in an "F" shape, wherein the running motor (1) comprises a motor barrel (3) and a rotor shaft (4), wherein the rotor shaft (4) extends into the gear box (2) and is transmission-connected to a gear set therein, and wherein: A front end cover (5) is provided between the running motor (1) and the gear box (2); two ends of the front end cover (5) are fixedly connected to the motor barrel (3) and the gear box (2), respectively; a first flameproof joint surface (6) is provided between the rotor shaft (4) and the front end cover (5); a second flameproof joint surface (7) is provided between the front end cover (5) and the motor barrel (3); a sealing member (8) is sleeved on the rotor shaft (4) and is sealed with the front end cover (5); the sealing member (8) divides the inner cavity of the gear box (2) and the inner cavity of the running motor (1) into two independent sealed flameproof cavities.
2. The F-type flameproof running motor of an electric hoist according to claim 1 is characterized in that: A bearing (9) is provided between the rotor shaft (4) and the front end cover (5); a first flameproof joint surface (6) between the rotor shaft (4) and the front end cover (5) is located at the rear side of the bearing (9); and the sealing member (8) is located at the front side of the bearing (9).
3. The F-type flameproof running motor of an electric hoist according to claim 1 is characterized in that: A rear end cover (10) is provided at the rear end of the motor barrel (3); the rotor shaft (4) extends out of the rear end cover (10) and is sleeved with a brake (11); the outer cover of the brake (11) is provided with a brake housing (12) fixedly connected to the rear end cover (10); a first flameproof joint surface (6) is provided between the rotor shaft (4) and the brake housing (12); and a second flameproof joint surface (7) is provided between the motor barrel (3) and the rear end cover (10), and between the rear end cover (10) and the brake housing (12).
4. The F-type flameproof running motor of an electric hoist according to claim 1 is characterized in that: A junction box (13) is connected above the motor barrel (3), a junction box cover (14) is provided on the junction box (13), and a second flameproof joint surface (7) is provided between the junction box (13) and the motor barrel (3), and between the junction box (13) and the junction box cover (14).
5. An F-type flameproof running motor for an electric hoist according to any one of claims 1 to 4, characterized in that: The first flameproof joint surface (6) has a fitting length L≥17mm, a fitting clearance ic≤0.15mm, and a surface roughness not exceeding 3.
2.
6. An F-type flameproof running motor for an electric hoist according to any one of claims 1 to 4, characterized in that: The fitting length L of the second flameproof joint surface (7) is ≥17 mm, the fitting clearance ic is ≤0.15 mm, and the surface roughness is not more than 1.6.