Explosion-proof motor

Abstract

The utility model discloses an explosion-proof motor which comprises the components of a housing which is provided with a mounting cavity, the two end surfaces of the mounting cavity in the axial direction of the motor are respectively provided with a cylinder, and one end of the cylinder, which is far away from the end surface of the mounting cavity, is an open end; the rotating shaft is arranged in the two barrels in a penetrating mode, and bearings are connected between the rotating shaft and the barrels; the stator is fixedly accommodated in the mounting cavity and is arranged outside the cylinder body in a sleeving manner; the rotor is accommodated in the mounting cavity and is fixedly connected with the rotating shaft; wherein the rotor is located between the two barrel bodies, the rotating shaft is further fixedly sleeved with a limiting sleeve for axially limiting the rotor, and the limiting sleeve is contained in the barrel bodies and blocks the open ends of the barrel bodies. With the adoption of the structure, the bearing in the motor can be effectively protected, and the position precision of the rotor after installation is improved.

Description

Technical Field

[0001] The utility model relates to a motor, in particular to an explosion-proof motor. Background Art

[0002] When a motor operates in an environment with flammable or explosive gases or dust, high heat and electrical sparks could ignite or explode the gases or dust, potentially causing serious safety accidents. Therefore, explosion-proof motors are primarily used in environments such as coal mining, oil and gas, and petrochemicals. Explosion-proof motors feature a structure that differs from that used in ordinary environments. They minimize the ingress of flammable gases and / or dust from outside the motor, and prevent flames from radiating out of the casing and igniting surrounding flammable gases and / or dust.

[0003] For example, Chinese utility model patent CN201520010411.9 discloses an explosion-proof disc-type flat pulley motor, comprising a housing, a rotating shaft, a stator, and a rotor. The housing defines a closed cavity, with the rotating shaft rotatably connected to the housing and partially disposed within the cavity. Both the stator and rotor are housed within the cavity, with the rotor fixedly connected to the rotating shaft. To ensure smooth transmission of the rotating shaft, a bearing is provided between the rotating shaft and the housing. However, the bearing is directly exposed to the cavity and is subject to the harsh working environment of the housing cavity. The bearing itself is relatively fragile and, after prolonged use, is susceptible to damage and degradation, which in turn affects the rotation of the rotating shaft.

[0004] Therefore, it is necessary to improve the prior art to overcome the above defects. Utility Model Content

[0005] The purpose of the utility model is to provide an explosion-proof motor to effectively protect bearings.

[0006] The purpose of this utility model is to achieve the following technical solutions: an explosion-proof motor, comprising:

[0007] The housing is formed with a mounting cavity, wherein the mounting cavity is provided with a cylinder at both end surfaces in the axial direction of the motor, and the end of the cylinder away from the end surface of the mounting cavity is an open end;

[0008] A rotating shaft is passed through the two cylinders, and a bearing is connected between the rotating shaft and the cylinders;

[0009] The stator is fixedly accommodated in the installation cavity and sleeved outside the cylinder;

[0010] a rotor, housed in the mounting cavity and fixedly connected to the rotating shaft;

[0011] The rotor is located between the two cylinders, and a limiting sleeve for axially limiting the rotor is fixedly provided on the outside of the rotating shaft. The limiting sleeve is accommodated in the cylinder and blocks the open end of the cylinder.

[0012] Furthermore, the inner and outer contours of the two cylinders are both circular and coaxial, the rotating shaft is coaxially arranged in the cylinder, and the outer diameter of the cylinder is smaller than the inner diameter of the stator and the outer diameter of the rotor.

[0013] Furthermore, the outer contour of the limiting sleeve is circular and is coaxially arranged on the cylinder. The limiting sleeve is clearance-fitted with the cylinder, and the axial end of the rotor is clearance-fitted with the open end of the cylinder.

[0014] Furthermore, a first chamber and a second chamber whose inner diameter is larger than the inner diameter of the first chamber are formed in the cylinder, a step surface is formed between the first chamber and the second chamber, the bearing is adapted to the first chamber, and the limiting sleeve is adapted to the second chamber.

[0015] Furthermore, there are two limiting sleeves, which are respectively accommodated in different cylinders, and the rotor is supported between the two limiting sleeves. At least one limiting sleeve is detachably connected to the rotating shaft.

[0016] Furthermore, there are two bearings, which are respectively accommodated in different cylinders. The outer ring of the bearing is fixed to the inner edge of the cylinder, and the end of the outer ring of the bearing facing away from the limit sleeve is abutted against the end face of the mounting cavity. A shoulder is provided on the rotating shaft, and the end of the inner ring of the bearing facing the limit sleeve is abutted against the shoulder.

[0017] Furthermore, there is a receiving space for accommodating the stator between the outer edge of at least one of the cylinders and the peripheral side of the installation cavity.

[0018] Furthermore, the peripheral contour of the installation cavity is circular and coaxial with the cylinder.

[0019] Furthermore, the housing includes:

[0020] The housing body has open ends at both ends of the motor axis;

[0021] Two end shells, each covering a different end of the opening;

[0022] The housing body and the end shell cooperate to form the installation cavity, and the two cylinders are respectively protruded from the inner end surfaces of different end shells.

[0023] Furthermore, at least one of the end shells is detachably connected to the casing body, and at least one of the end shells is provided with a circumvention hole along the axial direction of the motor for allowing the end of the rotating shaft to extend outside the casing.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the present invention provides a cylinder, which is located on the two end faces of the installation cavity, and the bearing is installed on the cylinder, thereby improving the convenience of bearing installation and the stability during operation, so that the rotating shaft connected to the bearing can rotate reliably; in addition, the rotor is located between the two cylinders, and a limiting sleeve is provided to be accommodated in the cylinder. On the one hand, the limiting sleeve can axially limit the rotor and improve the axial position accuracy of the rotor in the motor; on the other hand, it can also block the open end of the cylinder, so that the bearing is accommodated in a relatively closed space, thereby effectively protecting the bearing, reducing the chance of bearing damage during motor operation, and improving the working reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional schematic diagram of the explosion-proof motor of the utility model when the rotor is not set.

[0026] Figure 2 yes Figure 1 A partial enlarged view of point A.

[0027] Figure 3 It is a schematic diagram of the exploded structure of the utility model explosion-proof motor.

[0028] Description of reference numerals:

[0029] 100. Casing; 110. Mounting cavity; 120. Cylinder; 121. First chamber; 122. Second chamber; 123. Step surface; 130. Casing body; 140. End shell; 150. Mounting portion; 160. Avoidance hole; 200. Rotating shaft; 210. Shoulder; 300. Stator; 400. Rotor; 500. Bearing; 600. Limit sleeve. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some, rather than all, structures related to the present application are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0032] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] See also Figures 1 to 3 As shown, an explosion-proof motor corresponding to a preferred embodiment of the present invention includes a housing 100, a rotating shaft 200, a stator 300 and a rotor 400. A mounting cavity 110 is formed in the housing 100. The mounting cavity 110 is provided with a cylindrical body 120 at both end faces in the motor axial direction. The end of the cylindrical body 120 away from the end face of the mounting cavity 110 is an open end. The rotating shaft 200 is at least partially inserted into the two cylindrical bodies 120. A bearing 500 is connected between the rotating shaft 200 and the cylindrical body 120 so that the rotating shaft 200 can rotate smoothly and reliably relative to the housing 100. The stator 300 is fixedly received in the mounting cavity 110 and is sleeved outside the cylindrical body 120. The rotor 400 is received in the mounting cavity 110 and is located between the two cylindrical bodies 120. The rotor 400 is coaxial with the stator 300 and is fixedly connected to the rotating shaft 200 so as to rotate synchronously with the rotating shaft 200. Preferably, a limiting sleeve 600 for axially limiting the rotor 400 is fixedly sleeved on the outside of the rotating shaft 200 . The limiting sleeve 600 is received in the cylinder 120 and sealed at the open end of the cylinder 120 .

[0034] The present invention provides a cylinder 120, which is located on both end surfaces of the installation cavity 110, and the bearing 500 is installed on the cylinder 120, thereby improving the convenience of installation of the bearing 500 and the stability during operation, so that the rotating shaft 200 connected to the bearing 500 can rotate reliably; in addition, the rotor 400 is located between the two cylinders 120, and a limiting sleeve 600 is provided to be accommodated in the cylinder 120. On the one hand, the limiting sleeve 600 can axially limit the rotor 400 and improve the axial position accuracy of the rotor 400 in the motor; on the other hand, it can also block the open end of the cylinder 120 so that the bearing 500 is accommodated in a relatively closed space, thereby effectively protecting the bearing 500, reducing the probability of damage to the bearing 500 during operation of the motor, and improving the working reliability of the motor.

[0035] Furthermore, the circumferential contour of the mounting cavity 110 is circular, and the outer diameters of the stator 300 and the rotor 400 are no larger than the inner diameter of the mounting cavity 110. A receiving space is provided between the outer edge of at least one cylinder 120 and the circumferential side of the mounting cavity 110 to accommodate the stator 300. The stator 300 rests against the axial end face of the mounting cavity 110, and screws can be used to fasten the two. In this embodiment, there are two stators 300, and there is a receiving space for accommodating the stator 300 between the outer edges of the two cylinders 120 and the circumferential side of the mounting cavity 110. The two stators 300 are respectively fixed to different end faces of the mounting cavity 110. The rotor 400 is located between the two stators 300 to form a dual-stator single-rotor stand-alone unit. Of course, in other embodiments, only a single stator 300 can be provided, which is fixed to one of the end faces of the mounting cavity 110.

[0036] Furthermore, the inner and outer contours of the two cylinders 120 are both circular and coaxial, and the rotating shaft 200 is coaxially disposed within the cylinders 120. The outer diameter of the cylinder 120 is smaller than the inner diameter of the stator 300 to ensure that the stator 300 can be smoothly accommodated in the installation space. The outer diameter of the cylinder 120 is smaller than the outer diameter of the rotor 400, so that the axial projection of the rotor 400 can completely cover the open end of the cylinder 120, improving the barrier effect of the open end. Preferably, the axial end of the rotor 400 is clearance-fitted with the open end of the cylinder 120, leaving a small gap between the two to avoid hindering the rotation of the rotor 400 while improving the barrier effect of the open end.

[0037] Furthermore, there are at least two bearings 500 so as to be housed in different cylinders 120 respectively. In this embodiment, there are preferably two bearings 500, which can reliably guide the rotation of the rotating shaft 200 while effectively simplifying the structure of the motor. The outer ring of the bearing 500 is fixed to the inner edge of the cylinder 120, and an interference fit can be used. Preferably, the end of the outer ring of the bearing 500 facing away from the limiting sleeve 600 is against the end face of the mounting cavity 110, and the rotating shaft 200 is provided with a shoulder 210 opposite to the axial end face of the housing 100. The shoulder 210 corresponds to the two end faces one by one, and the end of the inner ring of the bearing 500 facing the limiting sleeve 600 is against the shoulder 210, thereby reliably limiting the bearing 500 in the axial direction while avoiding affecting its normal operation.

[0038] Furthermore, the outer contour of the limiting sleeve 600 is also circular and is coaxially mounted on the cylinder 120. The limiting sleeve 600 and the cylinder 120 preferably have a clearance fit to prevent obstruction of the rotation of the shaft 200 while effectively blocking the open end. There are at least two limiting sleeves 600, each housed in a different cylinder 120. The limiting sleeves 600 are positioned on either side of the rotor 400 in the axial direction. In this embodiment, two limiting sleeves 600 are preferably provided to reliably position the rotor 400 while effectively simplifying the motor structure.

[0039] In one embodiment, the limiting sleeve 600 is completely contained within the cylinder 120, i.e., one axial end of the limiting sleeve 600 does not protrude relative to the open end of the cylinder 120. However, with the above structure, due to the clearance fit between the end of the rotor 400 and the open end of the cylinder 120, a certain gap exists between the limiting sleeve 600 and the rotor 400, resulting in poor axial positioning accuracy of the rotor 400.

[0040] In a preferred embodiment, one axial end of the limiting sleeve 600 protrudes relative to the open end of the cylinder 120. The protruding portion of the limiting sleeve 600 abuts against the end of the rotor 400. The protruding dimension of the limiting sleeve 600 is the same as the gap dimension between the rotor 400 and the cylinder 120. This structure ensures that the rotor 400 is held between the two limiting sleeves 600, thereby ensuring the axial accuracy of the rotor 400.

[0041] Furthermore, at least one of the stop sleeves 600 is detachably connected to the rotating shaft 200 to ensure that the rotor 400, which is sleeved on the rotating shaft 200, can be positioned between the two stop sleeves 600 during installation. In this embodiment, one of the stop sleeves 600 is integrally formed with the rotating shaft 200, reducing the number of assembly steps for the stop sleeve 600 and improving the positional accuracy of the rotor 400 after assembly. The other stop sleeve 600 is fitted with the rotating shaft 200 through an interference fit to secure the stop sleeve 600 to the rotating shaft 200, resulting in easy installation and excellent reliability after connection.

[0042] Furthermore, since the bearing 500 and the limiting sleeve 600 both need to be installed into the cylinder 120 from the open end of the cylinder 120, in order to avoid the limiting sleeve 600 obstructing the installation of the bearing 500, the bearing 500 is usually assembled first, and the cylinder 120 needs to accommodate the bearing 500 and the limiting sleeve 600 at the same time, which makes its axial dimension larger and it is more inconvenient to install the bearing 500 to the preset position.

[0043] In a preferred embodiment, the outer diameter of the bearing 500 is smaller than that of the retaining sleeve 600. A first chamber 121 and a second chamber 122 are formed within the cylindrical body 120. The inner diameter of the second chamber 122 is larger than that of the first chamber 121. The bearing 500 fits within the first chamber 121, and the retaining sleeve 600 fits within the second chamber 122. The bearing 500 passes through the open end of the cylindrical body 120 and then through the second chamber 122, entering the first chamber 121 to securely connect with the first chamber 121. With this structure, the larger inner diameter of the second chamber 122 makes it easier to install the bearing 500 in the predetermined position along the axial direction of the cylindrical body 120. Furthermore, a stepped surface 123 is formed between the first and second chambers 121, 122. When the retaining sleeve 600 is accommodated in the second chamber 122, it provides a more effective barrier to the bearing 500. This makes it less likely that an abnormality in the mounting cavity 110 will affect the bearing 500.

[0044] Furthermore, the housing 100 comprises a housing body 130 and end shells 140. The housing body 130 is open at both ends of the motor's axial direction. Two end shells 140 are provided, each covering a different open end. The mounting cavity 110 is formed by the housing body 130 and the end shells 140. The two cylinders 120 protrude from the inner end surfaces of different end shells 140. The cylinders 120 and end shells 140 are preferably integrally formed to simplify assembly.

[0045] At least one end shell 140 is removably connected to the housing body 130, allowing the various components within the housing 100 to be smoothly assembled into the mounting cavity 110. In one embodiment, one end shell 140 can be integrally formed with the housing body 130, while the other end shell 140 is removably connected to the housing body 130. In this embodiment, both end shells 140 are removably connected to the housing body 130, making installation of the various components within the housing 100 more convenient. The end shells 140 and the housing body 130 can be fastened together using screws.

[0046] Preferably, the end surface of the end shell 140 is further provided with a mounting portion 150. The mounting portion 150 is a cylindrical portion coaxially arranged around the outer circumference of the barrel 120. The mounting portions 150 of the two end shells 140 extend toward each other to form a sealed mounting cavity 110 with the housing body 130. The stator 300 is fixed in the mounting portion 150. By adopting this structure, during assembly, the stator 300 can be first fixed to the end shell 140, and then the end shell 140 with the stator 300 mounted can be assembled to the housing body 130, making assembly more convenient. In addition, at least one end shell 140 is provided with an escape hole 160 extending through it along the axial direction of the motor. The end of the rotating shaft 200 can extend through the escape hole 160 to the outside of the housing 100 for connection to the load.

[0047] The installation process of the explosion-proof motor of the present invention is as follows: respectively install the bearing 500 in the first chamber 121 of the two end shells 140, and make one end of the outer ring of the bearing 500 abut against the end face of the end shell 140; respectively fix the two stators 300 in the end shells 140, and then fix one of the end shells 140 to the casing body 130; fix the rotor 400 on the outside of the rotating shaft 200, and make one end of the rotor 400 abut against the limit sleeve 600 formed on the rotating shaft 200, and then fix the other limit sleeve 600 on the rotating shaft 200. , and make it abut against the other end of the rotor 400; then install one end of the rotating shaft 200 into the bearing 500 of the end shell 140 connected to the casing body 130, until one of the shaft shoulders 210 of the rotating shaft 200 abuts against one end of the inner ring of the bearing 500; then install the other end shell 140 into the casing body 130. During this process, the other end of the rotating shaft 200 extends into the bearing 500 of the end shell 140 until the other shaft shoulder 210 abuts against one end of the inner ring of the bearing 500, and then lock the end shell 140 to complete the assembly.

[0048] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An explosion-proof motor, characterized in that: include: The housing (100) is formed with a mounting cavity (110), and the mounting cavity (110) is provided with a cylinder (120) at both end surfaces in the motor axial direction, and the end of the cylinder (120) away from the end surface of the mounting cavity (110) is an open end; A rotating shaft (200) is passed through the two cylindrical bodies (120), and a bearing (500) is connected between the rotating shaft (200) and the cylindrical bodies (120); A stator (300) is fixedly accommodated in the installation cavity (110) and sleeved outside the cylinder (120); a rotor (400) housed in the mounting cavity (110) and fixedly connected to the rotating shaft (200); The rotor (400) is located between the two cylinders (120), and a limiting sleeve (600) for axially limiting the rotor (400) is fixedly provided on the outside of the rotating shaft (200). The limiting sleeve (600) is accommodated in the cylinder (120) and blocks the open end of the cylinder (120).

2. The explosion-proof motor according to claim 1, characterized in that: The inner and outer contours of the two cylinders (120) are both circular and coaxial. The rotating shaft (200) is coaxially arranged in the cylinder (120). The outer diameter of the cylinder (120) is smaller than the inner diameter of the stator (300) and the outer diameter of the rotor (400).

3. The explosion-proof motor according to claim 2, characterized in that: The outer contour of the limiting sleeve (600) is circular and is coaxially arranged on the cylinder (120). The limiting sleeve (600) is clearance-fitted with the cylinder (120), and the axial end of the rotor (400) is clearance-fitted with the open end of the cylinder (120).

4. The explosion-proof motor according to claim 2, characterized in that: A first chamber (121) and a second chamber (122) having an inner diameter greater than that of the first chamber (121) are formed in the cylinder (120); a step surface (123) is formed between the first chamber (121) and the second chamber (122); the bearing (500) is adapted to the first chamber (121), and the limiting sleeve (600) is adapted to the second chamber (122).

5. The explosion-proof motor according to claim 1, characterized in that: There are two limiting sleeves (600), which are respectively accommodated in different cylinders (120); the rotor (400) is held between the two limiting sleeves (600); and at least one limiting sleeve (600) is detachably connected to the rotating shaft (200).

6. The explosion-proof motor according to claim 1, characterized in that: There are two bearings (500), which are respectively accommodated in different cylinders (120). The outer ring of the bearing (500) is fixed to the inner edge of the cylinder (120). The end of the outer ring of the bearing (500) facing away from the limiting sleeve (600) is against the end face of the installation cavity (110). The rotating shaft (200) is provided with a shaft shoulder (210), and the end of the inner ring of the bearing (500) facing the limiting sleeve (600) is against the shaft shoulder (210).

7. The explosion-proof motor according to claim 1, characterized in that: A receiving space for accommodating the stator (300) is provided between the outer edge of at least one of the cylinders (120) and the peripheral side of the installation cavity (110).

8. The explosion-proof motor according to claim 1, characterized in that: The peripheral profile of the installation cavity (110) is circular and coaxial with the cylinder (120).

9. The explosion-proof motor according to any one of claims 1 to 8, characterized in that: The housing (100) comprises: The housing body (130) has open ends at both ends in the motor axis direction; Two end shells (140) are provided, each of which covers a different end of the opening; The housing body (130) and the end shell (140) cooperate to form the installation cavity (110), and the two cylinders (120) are respectively protruded from the inner end surfaces of different end shells (140).

10. The explosion-proof motor according to claim 9, characterized in that: At least one end shell (140) is detachably connected to the housing body (130), and at least one end shell (140) is provided with a relief hole (160) along the motor axis for allowing the end of the rotating shaft (200) to extend outside the housing (100).

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