CN201174634Y - A miniature explosion-proof motor transformed from an ordinary micromotor - Google Patents

Abstract

The utility model provides a miniature flameproof motor formed by reforming a common micro-motor. A rotating shaft (2) of the common micro-motor (1) is sleeved with a shaft sleeve (7); a connecting flange (15) is fixed on a speed reducer part (4) of the common micro-motor through a fixing screw (13), and is fixed with an end cover (9); the shaft sleeve passes through a shaft hole on the end cover; the shaft sleeve and an inlaid sleeve (8) inlaid in the shaft hole are a pair of flameproof joint faces; an explosion-proof cable (18) is electrically connected with a motor part (5) and then passes through a hole at the back end of the a shell; a sealing ring (16) and a compression element (17) cover and clamp the cable; a spigot structure on the end cover and the front end of the shell form a spigot flameproof joint face (II), and a sealing ring (11) is placed between the end cover and the shell; and a connecting screw (10) fastens the end cover with the shell. Therefore, the common micro-motor is reformed into the miniature flameproof motor.

Description

A miniature explosion-proof motor transformed from an ordinary micromotor

Technical field

The utility model relates to a miniature explosion-proof motor transformed from an ordinary micro-motor, which belongs to the field of explosion-proof technology, and is especially suitable for small equipment in underground coal mines, and also suitable for small equipment in other explosive gas environments.

Background technique

In explosive gas environments, such as underground coal mines containing explosive gases such as gas, as well as in some petroleum and chemical industries, the motors used must be explosion-proof motors, otherwise there is a danger of explosion. At present, most motors used in explosive gas environments are flameproof synchronous motors or three-phase asynchronous motors. Some small equipment used in explosive gas atmospheres need to use small-power, small-volume, and small-weight micro-motors as power sources. Most of the micro-motors are micro-DC geared motors and stepper motors composed of motor parts and reducer parts. For example, the driving motor of the environmental detection robot after the coal mine underground disaster needs to use a small DC geared motor with flameproof performance. The explosion-proof motors on the market are mostly flame-proof motors with high power, large volume and weight, which are not suitable for small equipment; there are also some patent documents that propose the design of low-power flame-proof motors, such as patent: 200420037737.2, which provides A micro-motor explosion-proof driver, but it is only used to control the opening and closing of the ball valve, and it is not universal; patent: 88217779.6, which proposes a design scheme for an explosion-proof low-power motor, but this patent has not been used in the market technical product. However, most of the small motors suitable for small equipment are ordinary motors, which cannot be used directly in explosive gas environments. Therefore, the lack of small flameproof motors restricts the development of small equipment in explosive gas atmospheres to a certain extent.

Utility model content

The purpose of this utility model is to solve the explosion-proof problem of the micro-motor, and provide a kind of miniature explosion-proof motor transformed from an ordinary micro-motor, which does not change the original electrical performance of the ordinary micro-motor, and solves the problem of the explosion-proof motor. problem and can be used in explosive gas atmospheres.

The technical scheme that the utility model solves its technical problem adopts is:

The utility model comprises a common micro-motor composed of a reducer and a motor. A shaft sleeve is set on the rotating shaft of the above-mentioned common micro-motor to extend the rotating shaft of the motor. The connecting flange is fixed on the reducer part of the ordinary micro motor with fixing screws, and there are multiple connecting through holes on the periphery of the connecting flange, and the connecting screws pass through the through holes and the ends on the periphery of the connecting flange. The threaded blind hole on the inner side of the cover is connected, and the connecting flange is firmly connected to the inner side of the end cover; the end cover is provided with a shaft hole, and an inlay sleeve is embedded in the shaft hole. The shaft sleeve is a clearance fit and a pair of flameproof joint surfaces; the seam structure on the end cover and the front end of the shell form a seam flameproof joint surface, and a sealing ring is placed between the end cover and the shell, and the connecting screw connects the end cover It is connected with the shell; the outer side of the end cover is provided with a plurality of threaded blind holes to form a connecting flange, and a positioning boss is provided. The rear end of the shell is provided with a counterbore, the outer section of the counterbore is provided with an internal thread, the bottom of the counterbore is provided with a sealing ring, the internal thread of the counterbore engages with the external thread on the pressing element, and both the sealing ring and the pressing element are provided with Central hole for passage of Ex cables.

Using the above technical scheme, the ordinary micro-motor is fixed in the explosion-proof cavity composed of the end cover, the shell, the sealing ring and the pressing element. The flameproof joint surface is also formed between the bodies, and the rear end of the housing, the sealing ring and the pressing element constitute the flameproof cable lead-in device, so the ordinary micro motor is transformed into a flameproof micro motor. Because a plurality of threaded blind holes are provided on the outside of the end cover to form a connecting flange, and a positioning boss is provided, which is convenient for installation during use.

Using the above scheme, the following two beneficial effects can be achieved: 1. The ordinary micro-motor is transformed into a micro-flameproof motor; 2. The original electrical performance of the micro-motor is not changed, only the external dimensions, installation dimensions and weight. When selecting a motor, it can be selected according to the electrical performance parameters provided by the manufacturer, and the installation size is determined according to the installation size of the modified motor. The modified miniature flameproof motor can be applied to some small equipment used in explosive gas atmospheres.

Description of drawings

Fig. 1 is a three-dimensional structure diagram of a common micro-motor;

Fig. 2 is the structural diagram of the utility model embodiment;

Fig. 3 is the left view of the embodiment shown in Fig. 2;

In the figure: 1-Ordinary micro motor 2-Rotating shaft 3-Screw hole 4-Reducer part 5-Motor part 6-Terminal 7-Shaft sleeve 8-Inlaid sleeve 9-End cover 10-Connecting screw 11-Sealing ring 12- Shell 13-fixing screw 14-connecting screw 15-connecting flange 16-sealing ring 17-pressing element 18-explosion-proof cable 19-threaded blind hole

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a three-dimensional structure diagram of a common micro motor, the motor part 5 and the reducer part 4 constitute the common micro motor 1, the rear end of the motor part 5 is provided with a terminal 6, and the front end of the reducer part 4 is provided with a screw hole 3 , the rotating shaft 2 protrudes from the front end of the reducer part 4, and the ordinary micro-motor 1 does not have flameproof performance. Fig. 2, 3 are the structural diagrams of the utility model embodiment, in the figure, on the rotating shaft 2 of common micro-motor 1, axle sleeve 7 is set, and the cross-sectional shape of the hole of this axle sleeve 7 is consistent with the cross-sectional shape of rotating shaft 2 front ends, The two can be closely connected as one, thereby extending the rotating shaft 2 . The connecting flange 15 is fixed on the reducer part 4 of the ordinary micro-motor with fixing screws 13, and the periphery of the connecting flange 15 is provided with a plurality of connecting through holes, and the connecting screws 14 pass through the periphery of the connecting flange 15 The connection through hole on the upper end is connected with the threaded blind hole on the inner side of the end cover 9, and the connecting flange 15 is fixedly connected to the inner side of the end cover 9; the end cover 9 is provided with a shaft hole, and an inlay sleeve 8 is embedded in the shaft hole. 8 is an interference fit with the shaft hole, and it is a clearance fit with the passing shaft sleeve 7 and is a pair of flameproof joint surfaces I; the seam structure on the end cover 9 and the front end of the shell 12 form a seam flameproof joint surface II, And a sealing ring 11 is placed between the end cover 9 and the shell 12, and the connecting screw 10 connects the end cover 9 with the shell 12; a plurality of threaded blind holes 19 are provided on the outside of the end cover 9 to form a connecting flange, and set There are positioning ledges. The rear end of the casing 12 is provided with a counterbore, the outer section of the counterbore is provided with a threaded section, and the bottom of the counterbore is provided with a sealing ring 16, the internal thread of the counterbore is engaged with the external thread on the pressing element 17, and the sealing ring 16 is in contact with the pressing element 17. Elements 17 are all provided with a central hole for the passage of explosion-proof cables.

Ordinary micro-motor 1 is fixed in the explosion-proof chamber composed of end cover 9, housing 12, sealing ring 16 and pressing element 17, and the shaft sleeve 7 of the rotating shaft 2 forms a partition with the inlay sleeve 8 in the shaft hole of the end cover. The flameproof joint surface is also formed between the end cover and the housing; the rear end of the housing, the sealing ring 16 and the pressing element 17 constitute a flameproof cable entry device, so the ordinary micro motor is transformed into a flameproof micro motors. When connecting the cable, after the explosion-proof cable 18 is electrically connected to the terminal 6 of the motor part 5, it passes through the hole provided by the sealing ring 16 and the pressing element 17, and the external thread on the pressing element 17 is screwed into the counterbore at the rear end of the housing The internal thread of the sealing ring 16 is squeezed at the bottom of the hole, the deformation of the sealing ring 16 clamps the explosion-proof cable 18, and the deformation of the sealing ring 16 clamps the explosion-proof cable 18. The explosion-proof micro-motor can be installed and used independently. There are 19 groups of threaded blind holes on the outside of the end cover 9 to form a connecting flange, as shown in FIG.

The motor part of the above-mentioned micro motor has a power not greater than 250w and an operating current not greater than 5A. The above-mentioned shell 12 and end cap 9 can be made of steel, cast iron, light alloy or flame-retardant plastics containing no more than 6% (weight ratio) of magnesium, and the above-mentioned shaft hole inlay sleeve 8 adopts non-sparking materials (such as brass ) production. The above-mentioned explosion-proof joint surfaces all meet the requirements of the corresponding explosion-proof standards.

When selecting a motor, it can be selected according to the electrical performance parameters provided by the manufacturer, and the installation size is determined according to the installation size of the modified motor. The modified miniature flameproof motor can be used as a power source for some small equipment used in explosive gas atmospheres.

Claims (3)

1, a kind of miniature explosion separation motor that is transformed into by common micromachine, comprise common micromachine (1), shell (12) and end cap (9), axle sleeve (7) have been gone up suit in rotating shaft (2) in common micromachine (1), machine shaft (2) is prolonged, it is characterized in that: mounting flange (15) utilizes hold-down screw (13) to be fixed on the decelerator part (4) of common micromachine, and the periphery of mounting flange (15) is provided with a plurality of connecting through hole, the inboard tapped blind hole of connecting through hole and end cap (9) that joint bolt (14) passes on the periphery of mounting flange (15) connects, and mounting flange (15) is connected firmly in end cap (9) inboard; End cap (9) is provided with axis hole, is inlaid with mosaic set (8) in the axis hole, and this mosaic set (8) is an interference fit with axis hole, is matched in clearance and is a pair of flameproof joint (I) with the axle sleeve that passes (7); Fixing structure on the end cap (9) and shell (12) front end form seam flameproof joint (II), and have placed sealing ring (11) between end cap (9) and shell (12), and joint bolt (10) connects end cap (9) with shell (12); Shell (12) rear end is provided with counterbore, outer section of counterbore is provided with thread segment, the counterbore bottom is provided with sealing ring (16), the external screw thread engagement on the internal thread of counterbore and the clamping element (17), and sealing ring (16) is equipped with the centre bore that passes for anti-explosion cable with clamping element (17).

2, the miniature explosion separation motor that is transformed into by common micromachine according to claim 1 is characterized in that: be provided with a plurality of tapped blind holes (19) in the outside of end cap (9), form connecting flange, and be provided with the location convex.

3, the miniature explosion separation motor that is transformed into by common micromachine according to claim 1 is characterized in that: mosaic set (8) adopts the no-spark material.

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