Shaft current prevention structure of high-voltage motor

Abstract

The utility model belongs to the field of shaft current prevention structures, and particularly relates to a shaft current prevention structure of a high-voltage motor, which comprises a motor shaft and a casing end cover, a bearing is arranged on the outer side of a shaft body of the motor shaft, an insulating sleeve is arranged on the outer side of the bearing, and the insulating sleeve is slidably connected to the inside of the casing end cover. The left side of the insulation sleeve is in contact with a limiting sleeve, the limiting sleeve is in contact with the bearing and the machine shell end cover, the side, away from the bearing, of the limiting sleeve is fixedly connected with an insertion block, and the side, close to the limiting sleeve, of the insulation sleeve is fixedly connected with a positioning block. According to the utility model, the insulating sleeve is additionally arranged at the bearing between the motor shaft and the end cover, the insulating sleeve is in interference fit with the bearing, one side of the insulating sleeve is provided with the convex edge, and the other side of the insulating sleeve is limited through the limiting sleeve, so that direct current in the motor shaft cannot be conducted through the end cover of the motor shell and the motor shell to form a loop, and the motor is prevented from being damaged. The purpose of protecting the motor shaft is achieved.

Description

Technical Field

[0001] The utility model relates to the field of shaft current protection structures, in particular to a shaft current protection structure for a high-voltage motor. Background Art

[0002] An explosion-proof motor is a specially designed electric motor used to work in hazardous environments such as explosive gases, steam, and dust. These motors have explosion-proof properties and can prevent electric sparks from causing explosions. Explosion-proof motors usually use special housings and sealing designs to prevent explosions caused by sparks and high temperatures. For example, the invention application patent with application publication number CN105207391A proposes an explosion-proof motor, including a motor body and an exhaust device arranged at one end of the motor body, an explosion-proof casing is provided on the motor body, and a water injection layer is provided outside the explosion-proof casing to wrap the motor body, a water inlet is provided at the upper end of the motor body, and a water outlet is provided at the lower end of the motor body, and the water inlet and the water outlet are both connected to the water injection layer. The water injection layer outside the casing can be filled with water through the arrangement of upper and lower water outlets.

[0003] When the motor rotates, that is, the magnetic poles rotate, the magnetic flux through each magnetic pole changes, and the shaft voltage is induced at both ends of the shaft. A closed loop is formed between the bearings on both sides of the shaft and the casing and the casing end cover, thereby generating shaft current, which will damage the motor shaft. Therefore, it needs to be improved. Utility Model Content

[0004] The utility model aims to provide a high-voltage motor shaft current protection structure, which solves the problem that the motor shaft of the existing explosion-proof motor is prone to generate shaft current.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-voltage motor anti-shaft current structure, including a motor shaft and a casing end cover, a bearing is arranged on the outside of the shaft body of the motor shaft, an insulating sleeve is arranged on the outside of the bearing, the insulating sleeve is slidably connected to the inside of the casing end cover, the left side of the insulating sleeve contacts the limiting sleeve, and the limiting sleeve contacts both the bearing and the casing end cover, the side of the limiting sleeve away from the bearing is fixedly connected with an insert block, the side of the insulating sleeve close to the limiting sleeve is fixedly connected with a positioning block, the positioning block passes through the limiting sleeve and is slidably connected to the limiting sleeve, the positioning block is plugged into the insert block, the left side of the casing end cover is fixedly connected with a hollow shell, the inside of the hollow shell is slidably connected with a locking pin, one end of the locking pin is plugged with the insert block and the positioning block, the other end of the locking pin is fixedly connected with a connecting piece, and the connecting piece contacts the hollow shell.

[0006] Preferably, the outer side of the insulating sleeve is fixedly connected with a limiting strip, and the limiting strip is clamped with the housing end cover. The setting of the limiting strip has a positioning effect on the installation of the insulating sleeve in the housing end cover.

[0007] Preferably, the limiting sleeve is in a circular shape and is made of plastic material. The limiting sleeve made of plastic material has insulating properties.

[0008] Preferably, a pull ring is fixedly connected to one side of the connecting piece away from the hollow shell, and the pull ring is made of stainless steel. The setting of the pull ring facilitates pulling the locking pin.

[0009] Preferably, the middle section of the pin body of the locking pin is fixedly connected with a slider, and the inner side of the hollow shell is fixedly connected with a guide rod, and the guide rod passes through the slider and is slidably connected with the slider. The setting of the guide rod and the slider has a guiding effect on the locking pin.

[0010] Preferably, a spring is sleeved outside the rod body of the guide rod, one end of the spring is fixedly connected to the slider, and the other end of the spring is fixedly connected to the inner surface of the hollow shell. Through the arrangement of the spring, the elastic force can act on the locking pin through the slider.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] 1. The utility model adds an insulating sleeve at the bearing between the motor shaft and the end cover, and the insulating sleeve and the bearing are interference fit. In addition, one side of the insulating sleeve has a convex edge, and the other side of the insulating sleeve is limited by a limiting sleeve. In this way, the direct current in the motor shaft will not be conducted through the housing end cover and the motor housing to form a loop, thereby achieving the purpose of protecting the motor shaft.

[0013] 2. The utility model provides an insert block on the outside of the limit sleeve, and a hollow shell is provided on the outer surface of the casing end cover, a locking pin elastically guided by a guide rod, a slider and a spring is provided in the hollow shell, and a positioning block of the pipe limit sleeve is provided on the insulating sleeve, the positioning block can be inserted into the insert block, and the locking pin cooperates with the positioning block to facilitate the disassembly and assembly of the insulating sleeve at the casing end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The overall structure of the utility model is three-dimensional Figure 1 ;

[0015] Figure 2 The overall structure of the utility model is three-dimensional Figure 2 ;

[0016] Figure 3 It is a front cross-sectional view of the utility model;

[0017] Figure 4 For the utility model Figure 3 A magnified view of the structure of part A;

[0018] Figure 5 For the whole of the utility model Figure 1A three-dimensional diagram of the local structure.

[0019] In the figure: 1. motor shaft; 2. bearing; 3. insulating sleeve; 4. limit strip; 5. housing end cover; 6. limit sleeve; 7. positioning block; 8. plug-in block; 9. hollow shell; 10. locking pin; 11. connecting piece; 12. pull ring; 13. slider; 14. guide rod; 15. spring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5 A high-voltage motor shaft current protection structure includes a motor shaft 1 and a housing end cover 5. A bearing 2 is arranged on the outside of the shaft body of the motor shaft 1, and an insulating sleeve 3 is arranged on the outside of the bearing 2. The bearing 2 is connected to the insulating sleeve 3 and the motor shaft 1 by interference fit. The insulating sleeve 3 is slidably connected to the inside of the housing end cover 5. The outer side of the insulating sleeve 3 is fixedly connected to a limiting strip 4, and the limiting strip 4 is snap-fitted with the housing end cover 5. The setting of the limiting strip 4 has a positioning effect on the installation of the insulating sleeve 3 in the housing end cover 5. The left side of the insulating sleeve 3 contacts the limiting sleeve 6, and the limiting sleeve 6 contacts both the bearing 2 and the housing end cover 5. The limiting sleeve 6 is annular and made of plastic. The limiting sleeve 6 made of plastic has insulating properties.

[0022] See also Figure 4 The side of the limit sleeve 6 away from the bearing 2 is fixedly connected with an insert block 8, the side of the insulating sleeve 3 close to the limit sleeve 6 is fixedly connected with a positioning block 7, the positioning block 7 penetrates the limit sleeve 6 and is slidably connected with the limit sleeve 6, the positioning block 7 is plugged with the insert block 8, the left side of the casing end cover 5 is fixedly connected with a hollow shell 9, the inside of the hollow shell 9 is slidably connected with a locking pin 10, one end of the locking pin 10 is plugged with the insert block 8 and the positioning block 7, the other end of the locking pin 10 is fixedly connected with a connecting piece 11, and the connecting piece 11 is in contact with the hollow shell 9.

[0023] See also Figure 3 , Figure 4, a pull ring 12 is fixedly connected to the side of the connecting piece 11 away from the hollow shell 9, and the pull ring 12 is made of stainless steel. The setting of the pull ring 12 makes it easy to pull the locking pin 10. A slider 13 is fixedly connected to the middle section of the pin body of the locking pin 10, and a guide rod 14 is fixedly connected to the inner side of the hollow shell 9. The guide rod 14 passes through the slider 13 and is slidably connected to the slider 13. The setting of the guide rod 14 and the slider 13 has a guiding effect on the locking pin 10. A spring 15 is sleeved on the outer side of the rod body of the guide rod 14, one end of the spring 15 is fixedly connected to the slider 13, and the other end of the spring 15 is fixedly connected to the inner surface of the hollow shell 9. Through the setting of the spring 15, the elastic force can be applied to the locking pin 10 through the slider 13.

[0024] The specific implementation process of the utility model is as follows: when in use, firstly, the bearing 2 is installed between the motor shaft 1 and the insulating sleeve 3 by means of interference fit, and then the insulating sleeve 3 is put in from the inner side of the housing end cover 5, and positioned by the limit strip 4, and then the connecting piece 11 is pulled by the pull ring 12, and the connecting piece 11 pulls the locking pin 10, and the sliding block 13 is driven to slide on the outer side of the guide rod 14 during the movement of the locking pin 10, and the spring 15 is compressed, and then the state of the locking pin 10 is maintained, and the limit sleeve 4 is placed in the housing end cover 5, and then the locking pin 10 is kept in the housing end cover 5, and the limit sleeve 4 is placed in the housing end cover 5, and then the locking pin 10 is kept in the housing end cover 5, and the limit sleeve 4 is placed in the housing end cover 5, and then the locking pin 10 is kept in the housing end cover 5, and the limit sleeve 4 is placed in the housing end cover 5, and then the locking pin 10 is kept in the housing end cover 5, and the limit sleeve 4 is placed in the housing end cover 5, and then the locking pin 10 is kept in the housing end cover 5, and then ... 6 is fitted on the bearing 2 from the outside of the casing end cover 5, and the positioning block 7 on the limiting sleeve 6 is inserted into the limiting sleeve 6 and inserted into the insert block 8, and then the pull ring 12 is released, and the locking pin 10 is reset under the elastic force of the spring 15 and inserted into the positioning block 7 in the insert block 8, so that the overall installation is completed, and the motor shaft 1 is isolated from the casing end cover 5 by the insulating sleeve 3, so that the DC in the motor shaft 1 will not be conducted through the casing end cover 5 and the motor casing to form a loop, thereby achieving the purpose of protecting the motor shaft 1.

[0025] 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 high-voltage motor shaft current protection structure, comprising a motor shaft (1) and a housing end cover (5), characterized in that: A bearing (2) is arranged on the outside of the shaft body of the motor shaft (1), an insulating sleeve (3) is arranged on the outside of the bearing (2), the insulating sleeve (3) is slidably connected to the inside of the housing end cover (5), the left side of the insulating sleeve (3) contacts a limiting sleeve (6), and the limiting sleeve (6) contacts both the bearing (2) and the housing end cover (5), the side of the limiting sleeve (6) away from the bearing (2) is fixedly connected to an insert block (8), and the side of the insulating sleeve (3) close to the limiting sleeve (6) is fixedly connected to a positioning block ( 7), the positioning block (7) passes through the limiting sleeve (6) and is slidably connected to the limiting sleeve (6), the positioning block (7) is plugged into the plug block (8), the left side of the housing end cover (5) is fixedly connected to a hollow shell (9), the interior of the hollow shell (9) is slidably connected to a locking pin (10), one end of the locking pin (10) is plugged into the plug block (8) and the positioning block (7), the other end of the locking pin (10) is fixedly connected to a connecting piece (11), and the connecting piece (11) is in contact with the hollow shell (9).

2. A high-voltage motor shaft current protection structure according to claim 1, characterized in that: The outer side of the insulating sleeve (3) is fixedly connected to a limit strip (4), and the limit strip (4) is snap-fitted to the housing end cover (5).

3. A high voltage motor shaft current protection structure according to claim 1, characterized in that: The limiting sleeve (6) is in the shape of a ring and is made of plastic.

4. A high-voltage motor shaft current protection structure according to claim 1, characterized in that: A pull ring (12) is fixedly connected to the side of the connecting piece (11) away from the hollow shell (9), and the pull ring (12) is made of stainless steel.

5. The high-voltage motor shaft current protection structure according to claim 1 is characterized in that: The middle section of the pin body of the locking pin (10) is fixedly connected to a slider (13), and the inner side of the hollow shell (9) is fixedly connected to a guide rod (14), and the guide rod (14) passes through the slider (13) and is slidably connected to the slider (13).

6. A high voltage motor shaft current protection structure according to claim 5, characterized in that: A spring (15) is sleeved on the outside of the rod body of the guide rod (14), one end of the spring (15) is fixedly connected to the slider (13), and the other end of the spring (15) is fixedly connected to the inner surface of the hollow shell (9).

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