A protector structure of an electric machine and an electric machine

Abstract

The application relates to the technical field of motor equipment, and particularly discloses a protector structure of a motor and the motor. The protector structure of the motor comprises a shell, a connecting assembly and a wiring seat. The shell is provided with an accommodating cavity for accommodating the motor. The shell is provided with a wire outlet boss. The wire outlet boss is provided with a groove. The connecting assembly comprises a protection switch and a protective cover. The protection switch is arranged in the groove. The protective cover is arranged on the outer wall of the wire outlet boss. The wiring seat is connected to the shell. The wiring seat is arranged on one side of the wire outlet boss. The wiring seat is used for fixing a power line. The application has the effect of improving the problem that the large locked-rotor current of the motor generates sparks, which easily causes combustion or explosion.

Description

Technical Field

[0001] This application relates to the technical field of motor equipment, and in particular to a motor protector structure and a motor. Background Technology

[0002] Electric motors, especially encapsulated motors, are widely used in various household appliances and industrial equipment due to their compact structure, high efficiency, and low noise. To ensure safe operation, motors typically have built-in protectors (protective switches) to cut off the circuit in case of abnormal conditions such as stalling or overload.

[0003] As the application fields of electric motors continue to expand, their working environments are becoming increasingly complex and harsh. In industrial sectors such as coal, petroleum, chemical, pharmaceutical, and grain processing, flammable and explosive dust or gases are often present in the production environment. In such hazardous situations, if the motor stalls, the protective device will generate an electric arc spark at the moment of tripping, which can easily cause combustion or explosion, resulting in catastrophic personal injury and property damage. Utility Model Content

[0004] In order to improve the problem that the large stall current of the motor can generate sparks that can easily lead to combustion or explosion, this application provides a motor protector structure and a motor.

[0005] The motor protector structure provided in this application adopts the following technical solution: A motor protector structure includes: The outer casing has a receiving cavity for accommodating the motor, and a wire outlet boss protrudes from the outer wall, wherein the wire outlet boss has a groove. The connection assembly includes a protective switch and a protective cover. The protective switch is movably inserted into the groove of the outgoing protrusion, and the protective cover is disposed on the outer wall of the outgoing protrusion. A terminal block, connected to the housing, is located on one side of the cable outlet protrusion and is used to fix the power cord.

[0006] By adopting the above technical solution, the outer casing provides an installation space for the motor, the lead-out boss forms a structural isolation zone, physically separating the wiring area from the motor working area, improving sealing and protection. The groove can serve as the installation port for the protective switch, and the protective cover can cover the open area of ​​the lead-out boss, achieving a secondary sealing and safety isolation effect for the protective switch, preventing internal sparks or arcs generated by the protective switch from escaping from the groove, and improving the problem of the large stall current of the motor causing sparks that can easily lead to combustion or explosion. The terminal block can connect the power cord, withstand and eliminate the external mechanical stress such as pulling and twisting brought by the power cord, ensuring the power cord is secure.

[0007] Preferably, the outer wall of the lead-out boss is provided with a guide groove, and the inner wall of the protective cover is provided with a guide rib, and the guide groove and the guide rib are matched.

[0008] By adopting the above technical solution, the guide groove and guide rib can ensure that the protective cover is fitted onto the lead-out boss, realize foolproof operation, and avoid relative sliding and offset between the protective cover and the lead-out boss during motor operation, thereby improving the stability of the connection between the protective cover and the lead-out boss.

[0009] Preferably, the groove is a T-shaped groove, and the side of the groove away from the outer shell is open.

[0010] By adopting the above technical solution, the side of the groove away from the open part of the outer casing can be matched with the protection switch with the power cord already connected, which makes it convenient for the power cord to pass through the open part when installing the protection switch, thus making it easy to set the protection switch in the groove.

[0011] Preferably, the terminal block includes a fixed base and a splicing base. The fixed base is fixedly connected to the outer shell and the wire outlet protrusion. The fixed base and the wire outlet protrusion form a receiving groove. The fixed base has a first wire fixing hole. The splicing base is formed by a detachably connected upper cover and lower cover. The splicing base is disposed in the receiving groove. The splicing base has a second wire fixing hole. The first wire fixing hole and the second wire fixing hole are arranged opposite to each other.

[0012] By adopting the above technical solution, the fixing base is fixedly connected to the outer shell and the cable outlet boss, and together with the cable outlet boss, they form a receiving groove to provide an installation position for the splicing base; the splicing base is formed by the detachable connection of the upper cover and the lower cover, which can clamp the power cord. When the splicing base is set in the receiving groove, the second cable fixing hole on the splicing base is opposite to the first cable fixing hole on the fixing base to form a complete cable channel.

[0013] Preferably, the fixing seat is provided with a connecting groove, which is located on one side of the first fixing hole. A first limiting block and a second limiting block are provided in the connecting groove. Both the first limiting block and the second limiting block are used to abut against the splicing seat to limit the position of the splicing seat. A gap is provided between the first limiting block and the second limiting block.

[0014] By adopting the above technical solution, the first and second limiting blocks can make surface contact with the splicing base, restricting the position of the splicing base in the receiving groove and preventing the splicing base from moving or rotating in the receiving groove when the motor is working; the synergistic effect of the two limiting blocks ensures that the splicing base can only be placed into the connecting groove in the only correct direction and method, ensuring that the second fixing hole can be aligned with the first fixing hole on the fixing base, playing a foolproof role, thereby avoiding the risk of misalignment of the fixing hole or the cable being squeezed and worn due to installation deviation, and ensuring that the power cord can be fixed in a straight line.

[0015] Preferably, the upper cover is provided with a first groove, a positioning post, and a positioning frame. The first groove has a semi-circular cross-section. The positioning post is located on the side of the upper cover near the lower cover. The positioning frame is located on the side of the upper cover near the fixing seat. The positioning frame is located in the connecting groove. The inner wall of the positioning frame abuts against the first limiting block and the second limiting block. The outer wall of the positioning frame abuts against the lower cover, the wire outlet boss, and the fixing seat.

[0016] By adopting the above technical solution, the first groove of the upper cover can form half of the second wire fixing hole. The first groove can cooperate with the lower cover to wrap and clamp the power cable, avoiding the situation where the power cable is flattened or stress is concentrated. The positioning post can cooperate with the lower cover to prevent the upper and lower covers from being misaligned during the closing process. The positioning frame is placed in the connecting groove of the fixing seat. The inner wall of the positioning frame abuts against the first limiting block and the second limiting block, which can ensure the fixation of the upper cover in the horizontal direction, thereby realizing the positioning of the splicing seat and avoiding problems such as cable bending, wear or uneven clamping force caused by misalignment of the upper and lower covers.

[0017] Preferably, the lower cover is provided with a second groove, a positioning hole, and a positioning protrusion. The cross-section of the second groove is semi-circular. The second groove is matched with the first groove. The positioning hole is matched with the positioning post. The positioning protrusion is provided on the side of the lower cover near the fixing seat. The positioning protrusion is inserted into the gap between the first limiting block and the second limiting block. The positioning protrusion abuts against the inner wall of the first limiting block, the second limiting block, and the positioning frame.

[0018] By adopting the above technical solution, the second wire groove can form the other half of the second wire fixing hole, matching with the first wire groove to form a complete second wire fixing hole, thereby holding the power cord tightly and ensuring the stability of the power cord's position. The positioning hole allows the positioning pin to be inserted, thereby realizing the positioning between the upper and lower covers, preventing horizontal movement between the upper and lower covers, and also ensuring the alignment of the first and second wire grooves. The positioning protrusion is inserted into the gap between the first and second limiting blocks, and the top and bottom surfaces of the positioning protrusion are tightly abutted against the first and second limiting blocks, respectively, thereby restricting the horizontal movement of the splicing seat in the connecting groove. The side wall of the positioning protrusion abuts against the inner wall of the positioning frame of the upper cover, completing the vertical positioning and locking. Finally, the lower cover, the upper cover, and the fixing seat are connected into a whole.

[0019] Secondly, this application provides an electric motor, which adopts the following technical solution: An electric motor, comprising the aforementioned motor protector structure.

[0020] By adopting the above technical solution and using the above motor protector structure, the leakage of electric sparks in the protection switch can be prevented, thereby improving the explosion-proof performance of the motor.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The housing provides mounting space for the motor. The lead-out boss forms a structural isolation zone, physically separating the wiring area from the motor working area, improving sealing and protection. The groove serves as a mounting port for the protective switch. The protective cover covers the open area of ​​the lead-out boss, providing secondary sealing and safety isolation for the protective switch. This prevents internal sparks or arcs generated by the protective switch from escaping from the groove, mitigating the problem of high motor stall current causing sparks that could easily lead to combustion or explosion. The terminal block connects to the power cord, bearing and eliminating external mechanical stresses such as pulling and twisting from the power cord, ensuring the power cord is secure. 2. The guide groove and guide rib can ensure that the protective cover is fitted onto the lead-out boss, realize foolproof operation, and avoid relative sliding and offset between the protective cover and the lead-out boss during motor operation, thereby improving the stability of the connection between the protective cover and the lead-out boss. 3. The first and second limiting blocks can make surface contact with the splicing base, restricting the position of the splicing base in the receiving groove and preventing the splicing base from moving or rotating in the receiving groove when the motor is working; the synergistic effect of the two limiting blocks ensures that the splicing base can only be placed into the connecting groove in the only correct direction and method, ensuring that the second fixing hole can be aligned with the first fixing hole on the fixing base, playing a foolproof role, thereby avoiding the risk of misalignment of the fixing hole or cable being squeezed and worn due to installation deviation, and ensuring that the power cord can be fixed in a straight line. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the motor protector in the embodiments of this application; Figure 2 This is a schematic diagram of the motor protector structure after the protective cover is removed in the embodiments of this application.

[0023] Figure 3 This is a schematic diagram of the structure of the connection component in an embodiment of this application; Figure 4 This is a schematic diagram of the terminal block structure in an embodiment of this application; Figure 5 This is a front view of the terminal block in an embodiment of this application; Figure 6 This is a front view of the splicing base in the embodiments of this application; Figure 7 This is a rear view of the splicing bracket in the embodiments of this application; Figure 8This is a schematic diagram of the structure of the top cover in an embodiment of this application; Figure 9 This is a schematic diagram of the structure of the lower cover in an embodiment of this application; Figure 10 This is a schematic diagram of the motor structure using the motor protector structure in the embodiments of this application.

[0024] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Outlet boss; 12. Groove; 13. Receiving cavity; 2. Connecting assembly; 21. Protective switch; 22. Protective cover; 23. Guide rib; 24. Guide groove; 3. Terminal block; 31. Fixing base; 311. Connecting groove; 312. First wire fixing hole; 313. First limiting block; 314. Second limiting block; 32. Splicing base; 321. Top cover; 3211. First wire groove; 3212. Positioning post; 3213. Positioning frame; 322. Bottom cover; 3221. Second wire groove; 3222. Positioning hole; 3223. Positioning protrusion; 33. Receiving groove; 34. Second wire fixing hole. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0026] This application discloses a protector structure for an electric motor. (Refer to...) Figure 1 and Figure 2 The motor protector structure includes a housing 1, a connecting component 2, and a terminal block 3.

[0027] like Figure 1 and Figure 2 As shown, the outer casing 1 is provided with a receiving cavity 13 for accommodating the motor, and a wire outlet boss 11 is provided on the outer wall. The wire outlet boss 11 has a groove 12. The outer casing 1 provides an installation space for installing the motor. The wire outlet boss 11 forms a structural isolation area, which physically separates the wiring area from the motor working area, improving sealing and protection. The groove 12 can serve as an installation port for the protective switch 21 for the operator to install the protective switch 21.

[0028] like Figure 2 and Figure 3 As shown, the connecting component 2 includes a protective switch 21 and a protective cover 22. The protective switch 21 is movably inserted into the groove 12 of the outgoing protrusion 11, and the protective cover 22 is disposed on the outer wall of the outgoing protrusion 11. The protective cover 22 can cover the open area of ​​the outgoing protrusion 11, which can play a secondary sealing and safety isolation role for the protective switch 21, preventing internal sparks or arcs generated by the operation of the protective switch 21 from escaping from the groove 12, avoiding the risk of combustion or explosion caused by sparks in flammable and explosive environments, and improving the problem that the large stall current of the motor can easily cause sparks that lead to combustion or explosion.

[0029] In this embodiment, the outer wall of the lead-out boss 11 is provided with a guide groove 24, and the inner wall of the protective cover 22 is provided with a guide rib 23. The guide groove 24 and the guide rib 23 are matched and arranged. The groove 12 is a T-shaped groove, and the side of the groove 12 away from the outer shell 1 is open. The guide groove 24 and the guide rib 23 can ensure that the protective cover 22 is fitted on the lead-out boss 11, realize the foolproof operation, and avoid the relative sliding and offset between the protective cover 22 and the lead-out boss 11 during the operation of the motor, thereby improving the stability of the connection between the protective cover 22 and the lead-out boss 11. The open side of the groove 12 away from the outer shell 1 can match the protection switch 21 with the connected power cord, so that the power cord can pass through the open part when installing the protection switch 21, thereby making it easy to set the protection switch 21 in the groove 12.

[0030] For example, the housing 1 and the protective cover 22 are made of high-strength and flame-retardant engineering plastics, such as polybutylene terephthalate (PBT) or polyhexamethylene adipamide (PA66).

[0031] like Figure 4 and Figure 5 As shown, in addition to protecting against internal sparks, this application also manages the external power cord through a dedicated terminal block 3. The terminal block 3 is connected to the housing 1 and is located on one side of the outgoing protrusion 11 to fix the power cord. The terminal block 3 can connect to the power cord and withstand and eliminate external mechanical stresses such as pulling and twisting caused by the power cord, ensuring that the power cord is secure.

[0032] In this embodiment, the terminal block 3 includes a fixed base 31 and a splicing base 32. The fixed base 31 is fixedly connected to the outer shell 1 and the wire outlet protrusion 11. The fixed base 31 and the wire outlet protrusion 11 form a receiving groove 33. The fixed base 31 has a first wire fixing hole 312. Please refer to Figure 6 and Figure 7 The splicing base 32 is formed by connecting a detachable upper cover 321 and a lower cover 322. The splicing base 32 is disposed in the receiving groove 33. The splicing base 32 has a second wire fixing hole 34. The first wire fixing hole 312 is disposed opposite to the second wire fixing hole 34.

[0033] Specifically, the mounting base 31 is fixedly connected to the outer shell 1 and the cable outlet protrusion 11, and together with the cable outlet protrusion 11, they form a receiving groove 33, providing an installation position for the splicing base 32; the splicing base 32 is formed by the detachable connection of the upper cover 321 and the lower cover 322, which can clamp the power cord. When the splicing base 32 is set in the receiving groove 33, the second cable fixing hole 34 on the splicing base 32 is opposite to the first cable fixing hole 312 on the mounting base 31, forming a complete cable channel.

[0034] In this embodiment, the fixing base 31 is provided with a connecting groove 311, which is located on one side of the first wire fixing hole 312. A first limiting block 313 and a second limiting block 314 are provided within the connecting groove 311. Both the first limiting block 313 and the second limiting block 314 are used to abut against the splicing base 32 to limit the position of the splicing base 32. A gap is provided between the first limiting block 313 and the second limiting block 314. The first limiting block 313 and the second limiting block 314 can make face-to-face contact with the splicing base 32. The two limiting blocks restrict the position of the splicing base 32 within the receiving groove 33, preventing the splicing base 32 from moving or rotating within the receiving groove 33 when the motor is working. The coordinated action of the two limiting blocks ensures that the splicing base 32 can only be placed into the connecting groove 311 in the only correct direction and method, ensuring that the second wire fixing hole 34 can be aligned with the first wire fixing hole 312 on the fixing base 31, playing a foolproof role, thereby avoiding the risk of wire fixing hole misalignment or cable squeezing and wear due to installation deviation, and ensuring that the power cord can be fixed in a straight line.

[0035] It should be noted that, please refer to Figure 8 and Figure 9 The upper cover 321 is provided with a first groove 3211, a positioning post 3212, and a positioning frame 3213. The cross-section of the first groove 3211 is semi-circular. The positioning post 3212 is located on the side of the upper cover 321 near the lower cover 322. The positioning frame 3213 is located on the side of the upper cover 321 near the fixing seat 31. The positioning frame 3213 is located in the connecting groove 311. The inner wall of the positioning frame 3213 abuts against the first limiting block 313 and the second limiting block 314. The outer wall of the positioning frame 3213 abuts against the lower cover 322, the cable outlet boss 11, and the fixing seat 31. The lower cover 322... The lower cover 322 is provided with a second groove 3221, a positioning hole 3222, and a positioning protrusion 3223. The cross-section of the second groove 3221 is semi-circular. The second groove 3221 is matched with the first groove 3211. The positioning hole 3222 is matched with the positioning post 3212. The positioning protrusion 3223 is located on the side of the lower cover 322 near the fixed base 31. The positioning protrusion 3223 is inserted into the gap between the first limiting block 313 and the second limiting block 314. The positioning protrusion 3223 abuts against the inner wall of the first limiting block 313, the second limiting block 314, and the positioning frame 3213.

[0036] For example, the first groove 3211 of the upper cover 321 can form half of the second cable fixing hole 34. The first groove 3211 can cooperate with the lower cover 322 to wrap and clamp the power cable, preventing the power cable from being flattened or stress concentration. The positioning post 3212 can cooperate with the lower cover 322 to prevent the upper and lower covers 322 from being misaligned during the closing process. The positioning frame 3213 is placed in the connecting groove 311 of the fixing seat 31. The inner wall of the positioning frame 3213 abuts against the first limiting block 313 and the second limiting block 314, which can ensure the fixation of the upper cover 321 in the horizontal direction, thereby realizing the positioning of the splicing seat 32 and avoiding problems such as cable bending, wear or uneven clamping force caused by misalignment of the upper cover 321 and the lower cover 322. The second groove 3221 of the lower cover 322 can form the other half of the second cable fixing hole 34, matching with the first groove 3211 to form a complete second cable fixing hole 34, thereby holding the power cable tightly and ensuring the stability of the power cable position. The positioning hole 3222 allows the positioning post 3212 to be inserted, thereby achieving positioning between the upper cover 321 and the lower cover 322, preventing horizontal movement between the upper cover 321 and the lower cover 322, and ensuring alignment of the first groove 3211 and the second groove 3221; the positioning protrusion 3223 is inserted into the gap between the first limiting block 313 and the second limiting block 314, with the top and bottom surfaces of the positioning protrusion 3223 respectively aligned with the first limiting block 313 and the second limiting block 314. 14. The tight contact restricts the horizontal movement of the splicing base 32 within the connecting groove 311. The side wall of the positioning protrusion 3223 abuts against the inner wall of the positioning frame 3213 of the upper cover 321, completing the vertical positioning and locking. Finally, the lower cover 322, the upper cover 321, and the fixing base 31 are connected into a whole. While fixing the power cord, it can also block the possible spark overflow from below, thereby improving the problem that the large current of the motor stalling can easily cause sparks that may lead to combustion or explosion.

[0037] This application also discloses an electric motor. (Refer to...) Figure 10 The motor is housed in the receiving cavity 13 of the housing 1 and uses the motor protector structure described above. The motor is electrically connected to the power cord and the protector, thereby preventing the leakage of electric sparks from the protection switch 21 and improving the explosion-proof performance of the motor.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A protector structure for an electric motor, characterized in that, include: The outer casing (1) is provided with a receiving cavity (13) for accommodating the motor, and a wire outlet boss (11) is provided on the outer wall. The wire outlet boss (11) has a groove (12). The connecting component (2) includes a protective switch (21) and a protective cover (22). The protective switch (21) is movably inserted into the groove (12) of the outlet boss (11), and the protective cover (22) is disposed on the outer wall of the outlet boss (11). The terminal block (3) is connected to the outer casing (1) and is located on one side of the outgoing protrusion (11) for fixing the power cord.

2. The motor protector structure according to claim 1, characterized in that: The outer wall of the lead-out boss (11) is provided with a guide groove (24), and the inner wall of the protective cover (22) is provided with a guide rib (23). The guide groove (24) and the guide rib (23) are matched.

3. The motor protector structure according to claim 1, characterized in that: The groove (12) is a T-shaped groove, and the side of the groove (12) away from the outer shell (1) is open.

4. The motor protector structure according to claim 1, characterized in that: The terminal block (3) includes a fixed base (31) and a splicing base (32). The fixed base (31) is fixedly connected to the outer shell (1) and the wire outlet boss (11). The fixed base (31) and the wire outlet boss (11) enclose a receiving groove (33). The fixed base (31) has a first wire fixing hole (312). The splicing base (32) is formed by connecting a detachable upper cover (321) and a lower cover (322). The splicing base (32) is disposed in the receiving groove (33). The splicing base (32) has a second wire fixing hole (34). The first wire fixing hole (312) and the second wire fixing hole (34) are arranged opposite to each other.

5. The motor protector structure according to claim 4, characterized in that: The fixing base (31) is provided with a connecting groove (311), which is located on one side of the first wire fixing hole (312). A first limiting block (313) and a second limiting block (314) are provided in the connecting groove (311). The first limiting block (313) and the second limiting block (314) are both used to abut against the splicing base (32) to limit the position of the splicing base (32). A gap is provided between the first limiting block (313) and the second limiting block (314).

6. The motor protector structure according to claim 5, characterized in that: The upper cover (321) is provided with a first groove (3211), a positioning post (3212) and a positioning frame (3213). The cross-section of the first groove (3211) is semi-circular. The positioning post (3212) is located on the side of the upper cover (321) near the lower cover (322). The positioning frame (3213) is located on the side of the upper cover (321) near the fixing seat (31). The positioning frame (3213) is located in the connecting groove (311). The inner wall of the positioning frame (3213) abuts against the first limiting block (313) and the second limiting block (314). The outer wall of the positioning frame (3213) abuts against the lower cover (322), the wire outlet boss (11) and the fixing seat (31).

7. The motor protector structure according to claim 6, characterized in that: The lower cover (322) is provided with a second groove (3221), a positioning hole (3222), and a positioning protrusion (3223). The cross-section of the second groove (3221) is semi-circular. The second groove (3221) is matched with the first groove (3211). The positioning hole (3222) is matched with the positioning post (3212). The positioning protrusion (3223) is located on the side of the lower cover (322) near the fixing seat (31). The positioning protrusion (3223) is inserted into the gap between the first limiting block (313) and the second limiting block (314). The positioning protrusion (3223) abuts against the inner wall of the first limiting block (313), the second limiting block (314), and the positioning frame (3213).

8. An electric motor, characterized in that, Includes the motor protector structure as described in any one of claims 1-7.

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