Fire cut-off limiter device of explosion-proof conical rotor three-phase asynchronous motor junction box

Abstract

The invention discloses an explosion-proof conical rotor three-phase asynchronous motor junction box fire cut-off limiter device which comprises a shell, a limit switch is installed in the shell, a through hole with the circle center aligned with the circle center of the execution end of the limit switch is formed in the outer wall of the shell, and a connecting rod with the end extending out of the shell is arranged in the through hole in an attached and sliding mode. A shifting block with a T-shaped section is integrally arranged at the end, away from the limiting switch, of the connecting rod, a mounting groove is formed in the end, close to the limiting switch, of the connecting rod, and a connector is rotationally connected into the mounting groove and comprises a connecting base rotationally arranged in the mounting groove and a connector integrally arranged at the end, close to the limiting switch, of the connecting base. The end portion of the connector is provided with a connecting groove allowing the execution end of the limit switch to be transversely inserted therein, the width of the section of the inner wall of the mounting groove is larger than the width of the section of the outer wall of the connecting base by 1-2 mm, the rotatable design between the mounting groove and the connector facilitates adjustment and alignment when the concentricity is poor, and it is ensured that assembly is accurate and reliable.

Description

Technical Field

[0001] This invention patent relates to the technical field of motors, and specifically to a flame cut-off limiter device for the junction box of an explosion-proof conical rotor three-phase asynchronous motor. Background Art

[0002] The flame cut-off limiter is an important safety device mainly used to limit the operating range of equipment or mechanical components to ensure operation safety. The existing flame cut-off limiter used in the junction box of an explosion-proof conical rotor three-phase asynchronous motor generally forms a linkage by clamping a connecting rod to the execution end of a limit switch. However, when assembling the execution end of the limit switch and the connecting rod, due to the poor concentricity between the execution end of the limit switch and the connecting rod, the connecting rod and the execution end of the limit switch cannot be clamped. Therefore, we have designed a flame cut-off limiter that can still be connected under the condition of poor concentricity between the connecting rod and the execution end of the limit switch.

[0003] Content of the Invention Patent

[0004] The purpose of this invention patent is to provide a flame cut-off limiter device for the junction box of an explosion-proof conical rotor three-phase asynchronous motor to solve the problems raised in the above background art.

[0005] To solve the above technical problems, this invention patent provides the following technical solution: A flame cut-off limiter device for the junction box of an explosion-proof conical rotor three-phase asynchronous motor, including a housing. A limit switch is installed inside the housing. A through hole with the center aligned with the center of the execution end of the limit switch is provided on the outer wall of the housing. A connecting rod with one end extending out of the housing is fitted and slidably arranged in the through hole. A T-shaped dial is integrally provided at the end of the connecting rod away from the limit switch. An installation groove is provided at the end of the connecting rod close to the limit switch. A connecting head is rotatably connected in the installation groove. The connecting head includes a connecting seat rotatably arranged in the installation groove and a joint integrally provided at the end of the connecting seat close to the limit switch. A connecting groove for the horizontal insertion of the execution end of the limit switch is provided at the end of the joint. The width of the cross-section of the inner wall of the installation groove is 1 mm - 2 mm greater than the width of the cross-section of the outer wall of the connecting seat.

[0006] Further, the outer diameter of the joint is less than the outer diameter of the connecting seat.

[0007] Further, an annular groove is provided around the outer wall of the joint at the connection between the outer diameter of the joint and the connecting seat, and the middle of the inner wall of the annular groove is parallel to the bottom end of the connecting seat.

[0008] Further, the outer peripheral cross-sections at both the upper and lower ends of the connecting seat are arc-shaped.

[0009] Further, an inclined chamfer is provided at the bottom end of the inner wall of the installation groove.

[0010] Furthermore, an annular limiting groove is provided on the outer wall of one end of the connecting rod close to the limit switch. The annular limiting groove is used for clamping a limiting ring, and the outer diameter of the limiting ring > the outer diameter of the connecting rod.

[0011] Furthermore, a rod sleeve for inserting the connecting rod is embedded in the through hole, and the outer wall of the connecting rod is in fit and sliding connection with the inner wall of the rod sleeve.

[0012] Furthermore, an annular limiting block integrally provided with the rod sleeve is provided on the outer wall of the housing.

[0013] Furthermore, an annular installation groove is provided in the upper part of the inner wall of the annular limiting block away from the limit switch. An oil seal is installed in the annular installation groove, and an oil seal retaining cover is provided at one end of the annular limiting block away from the limit switch.

[0014] The beneficial effects achieved by this invention patent are as follows:

[0015] 1. The design of the installation groove and the connecting head provides flexibility during the assembly process. Especially when the concentricity between the connecting rod and the execution end of the limit switch is poor, this design allows the alignment problem to be corrected by adjusting the angle of the connecting head, thus ensuring the accuracy and reliability of the assembly.

[0016] 2. By setting the outer diameter of the joint to < the outer diameter of the connecting seat, the distance between the outer wall of the joint and the installation groove is increased, providing more space for the deflection of the connecting head. At the same time, the setting of the annular groove further provides a receiving space at the included angle at the bottom end of the inner wall of the installation groove, thereby further increasing the deflection angle.

[0017] 3. The outer peripheral cross-sections at both the upper and lower ends of the connecting seat are arc-shaped, which can avoid jamming caused by abutment when the 90° outer periphery slides in the installation groove, making the linkage of the connecting rod, the connecting head, and the execution end of the limit switch more smooth during pressing and rebounding.

[0018] 4. The setting of the inclined guide angle increases the distance between the inner wall of the installation groove and the annular groove, thereby increasing the deflectable angle of the connecting head. At the same time, the guide angle can reduce the friction between the connecting seat and the edge of the installation groove during pressing and rebounding, thus extending the service life of the components and avoiding jamming during the movement process. Description of the Drawings

[0019] Figure 1 It is a cross-sectional view of a flame cut-off limiter device of an explosion-proof conical rotor three-phase asynchronous motor junction box in Embodiment 1;

[0020] Figure 2 It is Figure 1 a partial enlarged schematic view at a in

[0021] Figure 3 It is a cross-sectional view of the flame cut-off limiter device of an explosion-proof conical rotor three-phase asynchronous motor junction box in Embodiment 2;

[0022] Figure 4 It is a schematic structural diagram of the connection state between the execution end of the limit switch and the joint in the present invention. Specific embodiments

[0023] The following further describes the present invention patent with reference to the accompanying drawings.

[0024] As Figure 1-2 shown, the present invention patent discloses a flame cut-off limiter device for an explosion-proof conical rotor three-phase asynchronous motor junction box, including: a housing 1, a limit switch 2 is installed inside the housing 1, a through hole 11 with the center of the circle aligned with the center of the execution end of the limit switch 2 is provided on the outer wall of the housing 1, a connecting rod 3 with an end extending out of the housing 1 is fitted and slidably arranged in the through hole 11, a T-shaped block 31 is integrally arranged at the end of the connecting rod 3 away from the limit switch 2, an installation groove 32 is arranged at the end of the connecting rod 3 close to the limit switch 2, a connecting head 4 is rotatably connected in the installation groove 32, the connecting head 4 includes a connecting seat 41 rotatably arranged in the installation groove 32 and a joint 42 integrally arranged at the end of the connecting seat 41 close to the limit switch 2, a connecting groove 43 for the execution end of the limit switch 2 to be horizontally inserted is arranged at the end of the joint 42, and the width of the cross-section of the inner wall of the installation groove 32 > the width of the cross-section of the outer wall of the connecting seat 41 by 1 mm - 2 mm.

[0025] Based on the above structure, as Figure 1-2 and 4 shown, when assembling the execution end of the limit switch 2 and the connecting rod 3, first place the connecting seat 41 in the installation groove 32, then orient the end of the connecting rod 3 with the installation groove 32 towards the through hole 11, and insert the connecting rod 3 and the connecting head 4 into the housing 1 through the through hole 11 together. When the concentricity between the connecting rod 3 and the execution end of the limit switch 2 is poor, pull out part of the connecting head 4, and horizontally insert the execution end of the limit switch 2 into the connecting groove 43. Then, with the execution end of the limit switch 2 as the center of the circle, rotate the connecting head 4 to align the connecting seat 41 with the installation groove 32, and insert the connecting seat 41 into the installation groove 32.

[0026] Furthermore, as Figure 1-2 shown, in order to increase the deflectable angle of the connecting head 4, the design that the outer diameter of the joint 42 < the outer diameter of the connecting seat 41 can increase the distance between the outer wall of the joint 42 and the installation groove 32, thereby realizing the increase of the deflectable angle.

[0027] Furthermore, as Figure 1-2As shown in the figure, in order to further increase the deflectable angle of the connector 4, an annular groove 421 is provided around the connection part between the outer diameter of the connector 42 and the socket 41 along the outer wall of the connector 42. The middle part of the inner wall of the annular groove 421 is parallel to the bottom end of the socket 41. The setting of the annular groove 421 further provides a receiving space at the included angle at the bottom end of the inner wall of the mounting groove 32, thereby further increasing the deflectable angle.

[0028] Furthermore, as Figure 1-2 shown in the figure, in order to make the linkage of the connecting rod 3, the connector 4 and the actuating end of the limit switch 2 more smooth during pressing and rebounding, the outer peripheral cross-sections at both the upper and lower ends of the socket 41 are arc-shaped, which can avoid jamming caused by abutment when the outer periphery with a 90° cross-section slides in the mounting groove 32.

[0029] Furthermore, as Figure 2 shown in the figure, in order to further increase the deflectable angle of the connector 4, an inclined chamfer 321 is provided at the bottom end of the inner wall of the mounting groove 32. The setting of the inclined chamfer 321 increases the distance between the inner wall of the mounting groove 32 and the annular groove 421, thereby increasing the deflectable angle of the connector 4. At the same time, the chamfer 321 can reduce the friction between the socket 41 and the edge of the mounting groove 32 during pressing and rebounding, thus extending the service life of the component and avoiding jamming during the movement process.

[0030] Furthermore, as Figure 1-2 shown in the figure, in order to prevent the connecting rod 3 from falling off, an annular limiting groove 33 is provided on the outer wall of the connecting rod 3 near one end of the limit switch 2. The annular limiting groove 33 is used for clamping the limiting ring 34, and the outer diameter of the limiting ring 34 > the outer diameter of the connecting rod 3.

[0031] Furthermore, as Figure 3 shown in the figure, in order to reduce the wear of the connecting rod 3 caused by long-term movement in the through hole 11, the inner diameter of the through hole 11 is increased, and a rod sleeve 5 for the connecting rod 3 to be inserted is embedded in the through hole 11. The outer wall of the connecting rod 3 is in fit and sliding connection with the inner wall of the rod sleeve 5.

[0032] Furthermore, as Figure 3 shown in the figure, in order to prevent the rod sleeve 5 from falling into the housing 1 and at the same time facilitate the removal of the rod sleeve 5, an annular limiting block 51 integrally provided with the rod sleeve 5 is provided on the outer wall of the housing 1. The annular limiting block 51 is fixed to the housing 1 by two bolts.

[0033] Furthermore, as Figure 3As shown in the figure, in order to reduce the wear of the connecting rod 3 caused by its long-term movement in the rod sleeve 5, an annular installation groove 511 is provided in the upper part of the inner wall of the annular limiting block 51 away from the limit switch 2. An oil seal 6 is installed in the annular installation groove 511. An oil seal cover 61 is provided at one end of the annular limiting block 51 away from the limit switch 2. The oil seal cover 61 and the annular limiting block 51 are fixed to the housing 1 by sharing two bolts.

[0034] The above is only a preferred specific embodiment of the present invention for patent, but the protection scope of the present invention for patent is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention for patent, according to the technical solution and inventive concept of the present invention for patent, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention for patent.

Claims

1. A flameout limiter device for an explosion-proof conical rotor three-phase asynchronous motor junction box, comprising a housing (1), a limit switch (2) being installed in the housing (1), characterized in that: A through hole (11) is provided on the outer wall of the housing (1), the center of which is aligned with the center of the actuating end of the limit switch (2); a connecting rod (3) is fitted and slidably arranged in the through hole (1), the end of which extends out of the housing (1); a shift block (31) with a T-shaped cross section is integrally arranged at one end of the connecting rod (3) away from the limit switch (2); a mounting groove (32) is provided at one end of the connecting rod (3) close to the limit switch (2); a connecting head (4) is rotatably connected in the mounting groove (32); the connecting head (4) comprises a connecting seat (41) rotatably arranged in the mounting groove (32) and a joint (42) integrally arranged at the end of the connecting seat (41) close to the limit switch (2); a connecting groove (43) for the actuating end of the limit switch (2) to be transversely inserted is provided at the end of the joint (42); the width of the inner wall cross section of the mounting groove (32) is greater than the width of the outer wall cross section of the connecting seat (41) by between 1 mm and 2 mm.

2. The flameout limiter device of the explosion-proof conical rotor three-phase asynchronous motor junction box according to claim 1 is characterized in that: The outer diameter of the joint (42) is smaller than the outer diameter of the connecting seat (41).

3. The flameout limiter device of the explosion-proof conical rotor three-phase asynchronous motor junction box according to claim 2 is characterized in that: An annular groove (421) is arranged around the outer wall of the joint (42) at the connection point between the outer diameter of the joint (42) and the connecting seat (41), and the middle part of the inner wall of the annular groove (421) is parallel to the bottom end of the connecting seat (41).

4. The flameout limiter device of the explosion-proof conical rotor three-phase asynchronous motor junction box according to claim 3 is characterized in that: The outer circumferential cross-sections of the upper and lower ends of the connecting seat (41) are both arranged in an arc shape.

5. The flameout limiter device of the explosion-proof conical rotor three-phase asynchronous motor junction box according to claim 3 is characterized in that: The bottom end of the inner wall of the installation groove (32) is provided with an inclined chamfer (321).

6. A flameout limiter device for an explosion-proof conical rotor three-phase asynchronous motor junction box according to any one of claims 4 to 5, characterized in that: An annular limiting groove (33) is provided on the outer wall of one end of the connecting rod (3) close to the limit switch (2), and the annular limiting groove (33) is used to clamp a limiting ring (34), and the outer diameter of the limiting ring (34) is greater than the outer diameter of the connecting rod (3).

7. The flameout limiter device of the explosion-proof conical rotor three-phase asynchronous motor junction box according to claim 6 is characterized in that: A rod sleeve (5) for inserting a connecting rod (3) is embedded in the through hole (11); the outer wall of the connecting rod (3) fits the inner wall of the rod sleeve (5) and is slidably connected.

8. The flameout limiter device of the explosion-proof conical rotor three-phase asynchronous motor junction box according to claim 7 is characterized in that: An annular limiting block (51) is provided on the outer wall of the housing (1) and is integrally formed with the rod sleeve (5).

9. The flameout limiter device of the explosion-proof conical rotor three-phase asynchronous motor junction box according to claim 8, characterized in that: An annular mounting groove (511) is provided on the upper portion of the inner wall of the annular limit block (51) away from the limit switch (2), an oil seal (6) is installed in the annular mounting groove (511), and an oil seal cover (61) is provided on one end of the annular limit block (51) away from the limit switch (2).

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