Dust explosion-proof three-phase asynchronous motor for fan

Abstract

A dust explosion-proof three-phase asynchronous motor for a fan comprises an explosion-proof shell and a swing motor, a cable lead-in hole of the explosion-proof shell is fixedly connected with a wire outlet seat, a sealing chuck unit is inserted in the wire outlet seat, a cable can pass through the sealing chuck unit, and the straightness of the passing cable can be kept through the sealing chuck unit. The sealing clamp unit comprises a first sealing clamp head inserted in the wire outlet seat, a second sealing clamp head connected to the first sealing clamp head and a third sealing clamp head connected to the second sealing clamp head, a cable is wrapped in the first sealing clamp head by filling filler, and the wrapping can generate extrusion force for extruding the cable; and when the third sealing chuck reaches the final position of the second sealing chuck, the displacement of the third sealing chuck on the cable can be prevented. The beneficial effects of the utility model lie in that the connection between the sealing chuck unit and the cable is realized through a sectional connection mode, so that the connection between the sealing chuck unit and the cable can be facilitated, the sealing performance can be maintained, and the length of the cable for keeping the straightness can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof motors, in particular to a dust explosion-proof three-phase asynchronous motor for a fan. Background Art

[0002] Explosion-proof motors are motors that can be used in flammable and explosive places and do not generate sparks during operation. Explosion-proof motors are mainly used in coal mines, oil and gas, petrochemical and chemical industries. In addition, they are also widely used in textiles, metallurgy, city gas, transportation, grain and oil processing, papermaking, medicine and other sectors. As the main power equipment, explosion-proof motors are usually used to drive pumps, fans, compressors and other transmission machinery.

[0003] Publication No. CN210053290U discloses an explosion-proof motor cable introduction device, including an explosion-proof housing, a cable introduction hole of the explosion-proof housing is fastened to a wire outlet seat cavity, two gaskets are built into the wire outlet seat cavity, a sealing rubber ring is arranged between the two gaskets, and an explosion-proof cable fixing joint is also arranged in the axial outer end mounting hole of the wire outlet seat cavity, and the axial inner end of the explosion-proof cable fixing joint is against the outer gasket. The cable introduction device of this explosion-proof motor is composed of a wire outlet seat cavity and an explosion-proof cable fixing joint, that is, the explosion-proof cable fixing joint is fixed on the cable, and then the explosion-proof cable fixing joint is inserted into the wire outlet seat cavity to achieve connection, but there is a defect, that is, there is a lack of pre-connector inside the explosion-proof cable fixing joint, so that when the cable is connected to the explosion-proof cable fixing joint, in order to ensure the connection stability of the two, only an interference fit method can be used, which makes manual installation difficult, that is, there is insertion resistance when the cable is inserted into the explosion-proof cable fixing joint, resulting in the situation that the insertion is not in place, so it is necessary to use an extrusion tool to assist the cable to insert into the explosion-proof cable fixing joint, which will undoubtedly reduce production efficiency. Utility Model Content

[0004] The utility model aims to solve the above-mentioned shortcomings of the prior art and provides a dust explosion-proof three-phase asynchronous motor for a fan to solve the above-mentioned problems.

[0005] The utility model adopts a technical solution to solve the technical problem: the dust-proof explosion-proof three-phase asynchronous motor for a fan comprises an explosion-proof shell and a swing motor arranged on the explosion-proof shell, the cable introduction hole of the explosion-proof shell is tightly connected with a wire outlet seat, a sealing clamp unit for allowing the cable to pass through and for maintaining the straightness of the passed cable is inserted in the wire outlet seat, the sealing clamp unit comprises a first sealing clamp inserted in the wire outlet seat, a second sealing clamp connected to the first sealing clamp, and a third sealing clamp connected to the second sealing clamp, the cable is wrapped in the first sealing clamp by filling filler, and the wrapping can generate an extrusion force for squeezing the cable, and the third sealing clamp can prevent itself from being displaced on the cable when it reaches the final position of the second sealing clamp.

[0006] For further improvement, an inner sleeve is arranged in the first sealing chuck, and the extrusion force generated by the contact between the filler and the cable is limited by the gap between the inner sleeve and the cable.

[0007] For further improvement, the inner cavity at one end where the first sealing chuck is plugged into and mated with the second sealing chuck has a first chamfer transition for expanding the inner cavity size so that the enlarged inner cavity size is consistent with the inner cavity size of the second sealing chuck, and the inner sleeve extends into the second sealing chuck and can adapt to the inner cavity size of the second sealing chuck.

[0008] To further improve, a cone sleeve is arranged in the inner cavity of the second sealing chuck, a spacing is reserved between the cone sleeve and the inner bushing, a sealing sleeve is arranged in the spacing and is inserted into the cone sleeve and abuts against the inner bushing, and the sealing sleeve is for the cable to pass through.

[0009] For further improvement, the inner cavity of one end where the second sealing chuck is plugged into and mated with the third sealing chuck has a second chamfer transition for expanding the inner cavity size so that the enlarged inner cavity size is consistent with the inner cavity size of the third sealing chuck, and a sealing ring extending to the second sealing chuck is provided in the inner cavity of the third sealing chuck.

[0010] For further improvement, a compression sleeve abutting against a sealing ring is arranged in the inner cavity of the third sealing chuck.

[0011] For further improvement, a lip seal ring is arranged inside the cover of the swing motor to seal the output shaft of the swing motor.

[0012] The beneficial effects of the utility model are:

[0013] The utility model realizes the connection between the sealing clamp unit and the cable by means of segmented connection, which can not only facilitate the connection between the sealing clamp unit and the cable and improve the production efficiency, but also maintain the sealing performance and extend the length of the cable to maintain straightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a partial cross-sectional structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the half-section structure on the left side of the utility model. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] Referring to the accompanying drawings: This dust-proof explosion-proof three-phase asynchronous motor for a fan comprises an explosion-proof shell 1, and a swing motor 2 arranged on the explosion-proof shell 1. The cable introduction hole of the explosion-proof shell 1 is fastened with a wire outlet seat 3, and a sealing chuck unit 4 is inserted into the wire outlet seat 3 for the cable to pass through and for the cable to maintain straightness. The sealing chuck unit 4 comprises a first sealing chuck 41 inserted into the wire outlet seat 3, a second sealing chuck 42 connected to the outside of the first sealing chuck 41, and a third sealing chuck 43 connected to the outside of the second sealing chuck 42. The cable is wrapped in the first sealing chuck 41 by filling the filler 5, and the wrapping can generate an extrusion force for squeezing the cable. When the third sealing chuck reaches the final position of the second sealing chuck, it can prevent itself from moving on the cable. The principle of the utility model is that the cable first passes through the first sealing clamp 41, and then the filler 5 is filled to ensure a stable connection between the cable and the first sealing clamp 41, and then the second sealing clamp 42 is connected to the first sealing clamp 41. The connection can be made in the form of a threaded connection. The second sealing clamp 42 is a transition section, which can extend the length of the cable that can maintain straightness. The function of the third sealing clamp 43 is the same as that of the first sealing clamp 41, that is, it is fixed on the cable to maintain the straightness of the cable. The third sealing clamp 43 is also connected to the second sealing clamp 42 in a threaded connection. The retention state on the cable is generated when it is completely installed on the second sealing clamp 42, so the third sealing clamp 43 can move freely on the cable when it has not arrived. In this way, the problem that the prior art needs to use auxiliary tools to complete the connection between the cable and the sealing clamp unit 4 can be solved, thereby improving efficiency.

[0018] An inner sleeve 6 is provided in the first sealing clamp 41. The extrusion force generated by the contact between the filler 5 and the cable is limited by the gap between the inner sleeve 6 and the cable. The inner sleeve 6 can increase the wall thickness of the first sealing clamp 41, thereby increasing the structural strength of the first sealing clamp 41 and reducing the distance formed between the inner cavity and the cable after the cable passes through. At the same time, filling the distance with a little more filler 5 than the required amount allows the solidified filler 5 to generate extrusion force, thereby ensuring the straightness of the cable. The inner sleeve 5 can reduce the amount of filler 5 used after reducing the distance. The reduction in the amount used can not only enable the filler 5 to quickly fill the gap during filling, but also enable the filler 5 to be quickly cleaned during maintenance.

[0019] The inner cavity at one end where the first sealing chuck 41 and the second sealing chuck 42 are plugged into each other has a first chamfered transition 41-a for expanding the size of the inner cavity so that the size of the expanded inner cavity is consistent with the size of the inner cavity of the second sealing chuck 42. The inner sleeve 6 extends into the second sealing chuck 42 and can adapt to the size of the inner cavity of the second sealing chuck 42. The first chamfered transition 41-a can expand the size of part of the inner cavity of the first sealing chuck 41 and keep it consistent with the size of the inner cavity of the second sealing chuck 42. At the same time, the inner sleeve 6 extends into the second sealing chuck 42, that is, the configuration of the extended part of the inner sleeve 6 is consistent with the configuration of the first chamfered transition 41-a set on the first sealing chuck 41. In this way, when the inner sleeve 6 extends to the second sealing chuck 42, it can form a fit with the inner cavity wall of the second sealing chuck 42 and can also increase the wall thickness of the second sealing chuck 42.

[0020] A cone sleeve 7 is arranged in the inner cavity of the second sealing chuck 42, and a spacing is reserved between the cone sleeve 7 and the inner bushing 6. A sealing sleeve 8 is arranged in the spacing and is inserted into the cone sleeve 7 and abuts against the inner bushing 6. The sealing sleeve 8 is for the cable to pass through. The sealing sleeve 8 is used to provide a sealing effect for the connection between the second sealing chuck 42 and the first sealing chuck 42. The sealing sleeve 8 is expanded by the cone sleeve 7 and abuts against the inner wall of the second sealing chuck 42. The cone sleeve 7 is also placed in the spacing between the sealing sleeve 8 and the inner bushing 6, so as to maintain the stability of the setting of the cone sleeve 7 by the mutual extrusion force generated by the sealing sleeve 8 and the inner bushing 6 on the cone sleeve 7, and at the same time, it can also keep the expansion effect on the sealing sleeve 8.

[0021] The inner cavity of one end where the second sealing chuck 42 and the third sealing chuck 43 are plugged into each other has a second chamfered transition 42-a for expanding the size of the inner cavity so that the size of the expanded inner cavity is consistent with the size of the inner cavity of the third sealing chuck 43. A sealing ring 9 extending to the second sealing chuck 42 is provided in the inner cavity of the third sealing chuck 43. The second chamfered transition 42-a can expand the size of part of the inner cavity of the second sealing chuck 42 and keep it consistent with the size of the inner cavity of the third sealing chuck 43, so that the sealing ring 9 can exist in both the second sealing chuck 42 and the third sealing chuck 43 at the same time.

[0022] A pressing sleeve 10 abutting against the sealing ring 9 is arranged in the inner cavity of the third sealing clamp 43, and the pressing sleeve 10 is matched with the second chamfered transition 42-a of the second sealing clamp 42, that is, the second chamfered transition 42-a serves as one end of the pressing sleeve 10 to abut against the sealing ring 9. Then, the pressing sleeve 10 gradually approaches the sealing ring 9 under the movement generated by the rotation of the third sealing clamp 43, and the squeezing force generated on the sealing ring 9 is gradually increased. The greater the squeezing force, the greater the amplitude of the pressure expansion of the sealing ring 9, thereby the greater the wrapping sealing of the cable is, and the better the sealing effect produced.

[0023] A lip seal ring 20 is arranged inside the cover 21 of the swing motor 2 to seal the output shaft of the swing motor 2. The lip seal ring 20 has the following advantages: 1. It has a lubricating effect. The lip part of the lip seal ring can form a lubricating layer for the medium through the heat generated by friction, thereby further improving the sealing effect; 2. It can withstand a certain axial deviation. The lip seal ring can withstand axial deviation to a certain extent, making the sealing effect more stable; 3. It can self-regulate. Since the lip seal ring is elastic and can self-regulate, it can still maintain a good sealing effect under certain external interference.

[0024] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A dust-proof explosion-proof three-phase asynchronous motor for a fan, comprising an explosion-proof housing (1), and a swing motor (2) arranged on the explosion-proof housing (1), wherein a cable lead-in hole of the explosion-proof housing (1) is fastened with a cable outlet seat (3), Features: A sealing chuck unit (4) is inserted into the outlet seat (3) for allowing a cable to pass through and for maintaining the straightness of the passed cable. The sealing chuck unit (4) comprises a first sealing chuck (41) inserted into the outlet seat (3), a second sealing chuck (42) connected to the first sealing chuck (41), and a third sealing chuck (43) connected to the second sealing chuck (42). The first sealing chuck (41) is filled with a filler (5) to wrap the cable, and the wrapping can generate a squeezing force for squeezing the cable. When the third sealing chuck (43) reaches the final position of the second sealing chuck (42), it can prevent itself from moving on the cable.

2. The dust explosion-proof three-phase asynchronous motor for a fan according to claim 1, Features: An inner bushing (6) is arranged inside the first sealing clamp (41), and the extrusion force generated by the contact between the filler (5) and the cable is limited by the gap between the inner bushing (6) and the cable.

3. The dust explosion-proof three-phase asynchronous motor for a fan according to claim 2, Features: The inner cavity of one end of the first sealing chuck (41) and the second sealing chuck (42) for plugging and mating has a first chamfer transition (41-a) for expanding the size of the inner cavity so that the size of the expanded inner cavity is consistent with the size of the inner cavity of the second sealing chuck (42), and the inner sleeve (6) extends into the second sealing chuck (42) and can adapt to the size of the inner cavity of the second sealing chuck (42).

4. The dust explosion-proof three-phase asynchronous motor for a fan according to claim 3, Features: A cone sleeve (7) is arranged in the inner cavity of the second sealing chuck (42), a spacing is reserved between the cone sleeve (7) and the inner bushing (6), a sealing sleeve (8) is arranged in the spacing and is inserted into the cone sleeve (7) and abuts against the inner bushing (6), and the sealing sleeve (8) is for the cable to pass through.

5. The dust explosion-proof three-phase asynchronous motor for a fan according to claim 4, Features: The inner cavity of one end of the second sealing chuck (42) and the third sealing chuck (43) for plugging and mating has a second chamfer transition (42-a) for expanding the size of the inner cavity so that the size of the expanded inner cavity is consistent with the size of the inner cavity of the third sealing chuck (43), and a sealing ring (9) extending to the second sealing chuck (42) is provided in the inner cavity of the third sealing chuck (43).

6. The dust explosion-proof three-phase asynchronous motor for a fan according to claim 5, Features: A pressing sleeve (10) is arranged in the inner cavity of the third sealing clamp (43) to abut against the sealing ring (9).

7. The dust explosion-proof three-phase asynchronous motor for a fan according to claim 1, Features: A lip seal ring (20) is arranged inside the cover portion (21) of the swing motor (2) for sealing the output shaft of the swing motor (2).

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