Motor protector

Abstract

The utility model discloses a motor protector, comprising a housing and a swing operation mechanism, the swing operation mechanism comprises a rocking handle rotatably arranged on a support, a locking fastener, a lever member and a jump fastener reciprocating between the rocking handle and the lever member; one end of the jump fastener abuts against the lock fastener to form locking fit, and the other end of the jump fastener is connected with the lever member. The rocking handle comprises a cam portion rotatably arranged on the support, the cam portion is connected with the jump fastener through a connecting rod piece, and the rocking handle can swing on the shell in a reciprocating mode. According to the technical scheme, the motor protector realizes switching-on and switching-off actions through the swinging operation mechanism, the swinging operation mechanism adopts a rocking handle mode to replace a traditional mode of two buttons and a rotating wheel, installation parts are reduced, a transmission structure is simplified, assembly is more convenient, production cost is reduced, the mechanism is more compact, matched transmission is reliable, and the service life of the motor protector is prolonged. Therefore, switching-on and switching-off operation of the swing operation mechanism is facilitated, and product use performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and particularly relates to a motor protector. Background Art

[0002] The motor protector is used for the infrequent starting, overload protection and short-circuit protection of a motor or an electric motor. In addition to the basic switch function for controlling the start / stop of the motor, the existing motor or motor starter is also required to add other functions such as safety protection and control of the motor operation characteristics. This kind of motor protector has short-circuit protection and overload protection functions. When the load is overloaded or single-phased, the bimetallic strip in the motor protector is heated and bent by a certain stroke to drive the operating mechanism in the motor protector to trip, thereby disconnecting the circuit to play an overload protection role; when the load is short-circuited, the electromagnetic release in the motor protector drives the iron core to act instantaneously to drive the operating mechanism to trip, thereby playing a short-circuit protection role.

[0003] The existing motor protector mainly includes a housing, an operating mechanism, a contact mechanism, a tripping mechanism, a setting current adjusting device, etc. The operating mechanism drives the moving and static contacts in the contact mechanism to close or open, so as to realize the starting or stopping of the motor. The existing operating mechanism mainly includes a start button, a stop button, a rotating wheel rotatably arranged on a bracket, a lock catch, a trip catch and a transmission assembly. The rotating wheel is connected to the trip catch through a connecting rod, and the transmission assembly is connected to the trip catch and the contact mechanism. The rotating wheel is provided with convex rods respectively cooperating with the start button and the stop button. By pressing the start button or the stop button, the rotating wheel is driven to perform closing or opening movement, and through the transmission cooperation among the lock catch, the trip catch and the transmission assembly, the moving and static contacts are closed or opened. It can be seen that this kind of operating mechanism needs to design two buttons, namely start / stop, to cooperate with the rotating wheel to respectively realize the opening and closing actions. There are many installed parts, the overall structure is complex, the installation is more cumbersome, and the manufacturing cost is increased. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the present utility model is to overcome the problems in the prior art that the operating mechanism needs to design two buttons, namely start / stop, to cooperate with the rotating wheel to respectively realize the opening and closing actions, there are many installed parts, the overall structure is complex, the installation is more cumbersome, and the manufacturing cost is increased.

[0005] To solve the above technical problems, the present utility model provides a motor protector, which includes a housing and a swing operating mechanism disposed in the housing. The swing operating mechanism drives the moving contact of the contact mechanism to contact or separate from the static contact. The swing operating mechanism includes a crank handle rotatably disposed on a bracket, a locking member, a lever member, and a jumping member that reciprocates between the crank handle and the lever member. The lever member has a closing position for driving the moving contact to contact the static contact and a tripping position for driving the moving contact to separate from the static contact during rotation. One end of the jumping member abuts against the locking member to form a locking fit, and the other end thereof is connected to the lever member. The crank handle extends out of the housing and swings reciprocally. It includes a cam portion rotatably disposed on the bracket. The cam portion is connected to the jumping member through a connecting rod member. When the crank handle swings reciprocally, it drives the jumping member to move through the connecting rod member. The jumping member drives the lever member to move to the closing position when the crank handle swings forward, and drives the lever member to move to the tripping position when the crank handle swings backward.

[0006] In the above-mentioned motor protector, the crank handle includes a handle portion connected to the cam portion and extending out of the top of the housing. There are two baffles on both sides of the handle portion at the top of the housing. The two baffles are provided with opposite first locking holes, and the crank handle is provided with second locking holes for passing through a locking member and cooperating with the first locking holes.

[0007] In the above-mentioned motor protector, the cam portion has a driving protrusion extending towards the side opposite to the handle portion. One end of the connecting rod member is connected to the driving protrusion through a first shaft member, and the other end thereof is connected to the middle of the jumping member through a second shaft member.

[0008] In the above-mentioned motor protector, the bracket is provided with a first guiding hole for connecting the first shaft member. The first shaft member passes through the connecting rod member and the driving protrusion and then is slidably connected in the first guiding hole. The first guiding hole is of an arc-shaped hole structure.

[0009] In the above-mentioned motor protector, the bracket is provided with a second guiding hole for connecting the second shaft member. The second shaft member passes through the connecting rod member and the jumping member and then is slidably connected in the second guiding hole. The second guiding hole is of an arc-shaped hole structure.

[0010] In the above-mentioned motor protector, the other end of the jumping member is provided with a slot opening, and the lever member is provided with a connecting portion inserted into the slot opening. A third shaft member for connecting the connecting portion is positioned and passed through the slot opening.

[0011] In the above-mentioned motor protector, the jumping member includes two push plates formed oppositely on both sides of the slot opening. Both ends of the third shaft member are respectively positioned and connected to the two push plates. The connecting portion is provided with a U-shaped connecting groove, and the third shaft member is inserted through the connecting groove.

[0012] In the above-mentioned motor protector, the bracket includes two side plates and an accommodation space formed between the two side plates for accommodating a tripping fastener, a locking fastener, a lever member and a cam portion; when the lever member is in the closing position, the connection lines of the first shaft member, the second shaft member and the third shaft member are in a straight line; when the lever member is in the opening position, the connection lines of the first shaft member, the second shaft member and the third shaft member are in a triangular shape.

[0013] In the above-mentioned motor protector, a torsion spring structure is provided between the lever member and the bracket. One end of the torsion spring structure is hooked on the lever member, and the other end thereof is provided on one of the side plates of the bracket.

[0014] In the above-mentioned motor protector, a contact mechanism is provided below the swing operation mechanism. The contact mechanism includes a contact support connected to the lever member. The lever member includes a pushing portion extending toward the side away from the tripping fastener and fittingly abutting against the contact support. An installation hole for connecting one end of the torsion spring structure is provided on the pushing portion.

[0015] The technical solution of the present utility model has the following advantages compared with the prior art:

[0016] 1. In the motor protector provided by the present utility model, during the closing operation, the operating crank swings forward. According to the cam portion of the crank being connected to the tripping fastener through a connecting rod member, the cam portion and the connecting rod member are in transmission cooperation to drive the tripping fastener to perform a closing movement, and the tripping fastener drives the lever member to rotate to the closing position to realize the contact between the moving and static contacts; and during the opening operation, only the operating crank needs to be swung backward, and the cam portion and the connecting rod member are in transmission cooperation to drive the tripping fastener to perform an opening movement, so that the tripping fastener drives the lever member to rotate to the opening position to realize the separation between the moving and static contacts; the motor protector of the present technical solution realizes the closing and opening actions through a swing operation mechanism. This swing operation mechanism uses a crank method to replace the traditional method of two buttons and a rotating wheel, reduces the installation parts, simplifies the transmission structure, is more convenient for assembly, reduces the production cost, makes the mechanism more compact, has reliable transmission cooperation, and is thus conducive to the closing and opening operations of the swing operation mechanism, improving the use performance of the product.

[0017] 2. In the motor protector provided by the present utility model, two baffles are provided on the top of the housing on both sides of the crank, and two opposite first locking holes are provided on the two baffles. When the crank swings to the opening position, the second locking hole on the crank is exactly aligned with the first locking holes on the two baffles, and a locking member is passed through the first locking hole and the second locking hole to lock the position of the crank, thereby locking the crank in the opening position to restrict its closing operation, which can prevent accidental closing operation of the motor protector during the circuit maintenance process, thus ensuring the safety of the staff during maintenance and making the use safer.

[0018] 3. In the motor protector provided by the present utility model, one end of the torsion spring structure is arranged on the bracket, and the other end is arranged on the pushing part of the lever member, and this pushing part is cooperatively abutted against the contact support. With this structural arrangement, when the swing operating mechanism performs the opening action, the lever member rapidly rotates to the opening position by means of the elastic force released by the torsion spring structure, and drives the pushing part to press down and move the contact support, thereby realizing the rapid separation of the moving and static contacts and improving the opening response speed of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Structural schematic diagram of the motor protector of the present utility model;

[0021] Figure 2 Structural schematic diagram of the swing operating mechanism of the present utility model in the back direction;

[0022] Figure 3 Structural schematic diagram of the swing operating mechanism of the present utility model in the front direction;

[0023] Figure 4 Stereoscopic structural schematic diagram of the swing operating mechanism of the present utility model;

[0024] Figure 5 Connection structural schematic diagram of the swing operating mechanism and the contact mechanism of the present utility model.

[0025] Description of the reference numerals: 1. Housing; 11. Baffle; 12. First locking hole; 2. Bracket; 21. First guiding hole; 22. Second guiding hole; 3. Rocking handle; 31. Cam part; 311. Driving protrusion; 32. Handle part; 33. Second locking hole; 4. Jumping fastener; 41. Slot opening; 42. Third shaft member; 5. Lever member; 51. Connecting part; 52. Connecting groove; 53. Pushing part; 6. Link member; 61. First shaft member; 62. Second shaft member; 7. Torsion spring structure; 8. Locking fastener; 91. Moving contact; 92. Static contact; 93. Contact support. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] Embodiment

[0030] The following is a specific description of this embodiment in conjunction with the accompanying drawings:

[0031] This embodiment provides a Figures 1-5 motor protector as shown, which includes a housing 1, a rocking operating mechanism and a contact mechanism arranged in the housing 1. The rocking operating mechanism drives the moving contact 91 in the contact mechanism to contact or separate from the static contact 92. The rocking operating mechanism includes a bracket 2, a rocking handle 3 rotatably arranged on the bracket 2, a locking part 8, a lever part 5, and a jumping part 4 that reciprocates between the rocking handle 3 and the lever part 5. The lever part 5 is connected to the contact mechanism and rotates under the drive of the rocking operating mechanism. The lever part 5 has a closing position where it drives the moving contact 91 to contact the static contact 92 and a tripping position where it drives the moving contact 91 to separate from the static contact 92 during the rotation process. One end of the jumping part 4 abuts against the locking part 8 to form a locking fit, and the other end is connected to the lever part 5. The rocking handle 3 extends out of the housing 1 and swings reciprocally. It includes a cam part 31 rotatably arranged on the bracket 2. The cam part 31 is connected to the jumping part 4 through a connecting rod part 6. The jumping part 4 drives the lever part 5 to move to the closing position when the rocking handle 3 swings forward and drives the lever part 5 to move to the tripping position when the rocking handle 3 swings backward.

[0032] In the above embodiments, when the motor protector performs a closing operation, the operating crank 3 swings forward. According to the cam portion 31 of the crank 3 being connected to the tripping fastener 4 through a connecting rod member, the cam portion 31 and the connecting rod member are in transmission cooperation to drive the tripping fastener 4 to perform a closing movement, and the tripping fastener 4 drives the lever member 5 to rotate to the closing position to achieve the contact between the moving and static contacts; and when the motor protector performs a tripping operation, only the operating crank 3 needs to swing backward, and the cam portion 31 and the connecting rod member are in transmission cooperation to drive the tripping fastener 4 to perform a tripping movement, so that the tripping fastener 4 drives the lever member 5 to rotate to the tripping position to achieve the separation between the moving and static contacts; the motor protector of the present technical solution realizes the closing and tripping actions through a swinging operation mechanism. This swinging operation mechanism uses a crank method to replace the traditional method of two buttons and a rotating wheel, reduces the installation parts, simplifies the transmission structure, is more convenient for assembly, reduces the production cost, makes the mechanism more compact, and has reliable transmission cooperation, thus facilitating the closing and tripping operations of the swinging operation mechanism.

[0033] Further preferably, referring to Figures 2-3 , the crank 3 includes a handle portion 32 connected to the cam portion 31 and extending out of the top of the housing. Two baffles 11 are provided on the top of the housing on both sides of the handle portion 32. The two baffles 11 are provided with opposite first locking holes 12. The crank 3 is provided with a second locking hole 33 for cooperating with the first locking hole 12 for passing through a locking member. The locking member can be a padlock or a lead seal, etc. In order to prevent the operator from accidentally closing the motor protector without knowing or lacking communication, when the crank 3 swings to the tripping position, that is, when the motor protector is in the tripping state, the second locking hole 33 on the crank just aligns with the first locking holes 12 on the two baffles. The locking member passes through the first locking hole 12 and the second locking hole 33 to lock the position of the crank 3, thereby locking the crank 3 in the tripping position to restrict its closing operation, which can prevent accidentally closing the motor protector during the line maintenance process, thus ensuring the safety of the staff during maintenance and making it safer to use. The forward swing and the backward swing in this article refer to the two opposite movement directions of a certain component, and do not represent the actual movement direction of the component.

[0034] The following will Figures 2-5 make a detailed description of the specific setting method of the swinging operation mechanism:

[0035] The crank handle 3, the jump fastener 4, the locking fastener 8, and the lever member 5 are all rotatably arranged on the bracket 2 through a rotating shaft. The cam portion 31 has a driving protrusion 311 extending toward the side opposite to the handle portion 32. One end of the link member 6 is connected to the driving protrusion 311 through a first shaft member 61, and the other end is connected to the middle of the jump fastener 4 through a second shaft member 62. Specifically, the bracket 2 is provided with a first guiding hole 21 for connecting the first shaft member 61. After passing through the link member and the driving protrusion 311, the first shaft member 61 is slidably connected to the first guiding hole 21. In addition, the bracket 2 is also provided with a second guiding hole 22 for connecting the second shaft member 62. After passing through the link member and the jump fastener 4, the second shaft member 62 is slidably connected to the second guiding hole 22. The second guiding hole 22 and the first guiding hole 21 are respectively arc-shaped hole structures, which play a guiding role in the movement of the first shaft member 61 and the second shaft member 62, thereby defining the reciprocating movement track of the jump fastener, and thus realizing the transmission of movement and force in the cooperation between the crank handle 3, the link member 6, the jump fastener 4, and the lever member 5.

[0036] Combined Figures 2-4 As shown, the other end of the jump fastener 4 is provided with a slot opening 41, and the lever member 5 is provided with a coupling portion 51 inserted into the slot opening 41. A third shaft member 42 connecting the coupling portion 51 is positioned and penetrated in the slot opening 41. Specifically, the jump fastener 4 includes two push plates formed oppositely on both sides of the slot opening 41. The two ends of the third shaft member 42 are respectively positioned and connected to the two push plates. The coupling portion 51 is provided with a U-shaped connection groove 52, and the third shaft member 42 is inserted into the connection groove 52. In this way, the linkage cooperation between the jump fastener 4 and the lever member 5 is realized, and the installation and connection are convenient. When the jump fastener 4 makes a reciprocating movement, the lever member 5 is driven to rotate through the third shaft member 42, so as to realize the rotational switching of the lever between the closing position and the opening position. Further preferably, the bracket 2 includes two side plates and a receiving space formed between the two side plates for accommodating the jump fastener 4, the locking fastener 8, the lever member 5, and the cam portion 31. When the motor protector is in the closing state, the lever member 5 is located at the closing position under the drive of the swing operating mechanism at this time, and the connecting lines of the first shaft member 61, the second shaft member 62, and the third shaft member 42 are in a straight line, so that the crank handle 3, the locking fastener 8, the lever member 5, the jump fastener 4, and the locking fastener 8 maintain a relative position balance in the closing state; and when the motor protector is in the opening state, the lever member 5 is located at the opening position under the drive of the swing operating mechanism at this time, and the connecting lines of the first shaft member 61, the second shaft member 62, and the third shaft member 42 are in a triangular shape.

[0037] Combined Figure 2 and Figure 5As shown, a torsion spring structure 7 is provided between the lever member 5 and the bracket 2. One end of the torsion spring structure 7 is hooked against the lever member 5, and the other end is provided on one of the side plates of the bracket 2. Below the swing operating mechanism, there is a contact mechanism. The contact of the contact mechanism supports and connects the lever member 5. The lever member 5 includes a pushing portion 53 that extends away from the side of the trip fastener 4 and cooperates with and abuts against the contact support. An installation hole for connecting one end of the torsion spring structure 7 is provided on the pushing portion 53. With this structural arrangement, when the swing operating mechanism performs a tripping action, the lever member 5 quickly rotates to the tripping position by means of the elastic force released by the torsion spring structure 7, drives the pushing portion 53 to press against the contact support, and applies a force to the contact support to drive the moving contact 91 to move away from the static contact 92, so that the moving and static contacts are quickly separated, improving the tripping response speed of the product; or when the motor protection trips due to a fault, that is, when the locking fastener 8 and the trip fastener 4 are disengaged and separated, the balance among the crank, the locking fastener, and the lever member is lost. At this time, the torsion spring structure will also drive the lever member 5 to quickly rotate to the tripping position to achieve the tripping and opening of the product. In this embodiment, it should be understood that the contact mechanism includes a contact support 93, a moving contact 91, a static contact 92, and a return spring. The swing operating mechanism and the contact mechanism are in transmission cooperation through the contact support 93 (the A in the attachment Figure 5 represents the swing operating mechanism). The contact support is movably arranged up and down in the housing. The moving contact 91 is arranged on the contact support. The static contact 92 is fixed in the housing and is arranged opposite to the moving contact 91. The return spring is arranged between the contact support and the housing to drive the contact support to perform a reset movement. The return spring applies an elastic force to the contact support 93 to drive the moving contact 91 to move closer to the static contact 92. Therefore, when the lever member 5 moves to the tripping position under the drive of the swing operating mechanism, the pushing portion 53 drives the contact support to move downward, thereby driving the moving and static contacts to separate to achieve the tripping operation of the motor protector; correspondingly, when the lever member moves to the closing position under the drive of the swing operating mechanism, since the pushing portion moves away from the contact support, the contact support is driven by the return spring to move upward in a reset manner, thereby driving the moving and static contacts to contact to achieve the closing operation of the motor protector.

[0038] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A motor protector, comprising a housing (1) and a swing operating mechanism disposed on the housing (1), characterized in that: The swing operating mechanism comprises a rocking handle (3) rotatably arranged on a bracket (2), a locking member (8), a lever member (5), and a tripping member (4) reciprocating between the rocking handle (3) and the lever member (5); the lever member (5) has a closing position in which a moving contact (91) is driven to contact a stationary contact (92) during rotation, and an opening position in which a moving contact (91) is driven to separate from a stationary contact (92); one end of the tripping member (4) abuts against the locking member (8) to form a locking member. The crank (3) is connected to the housing (1) and the other end is connected to the lever member (5); the crank (3) extends out of the housing (1) and can swing back and forth, and comprises a cam portion (31) rotatably arranged on the bracket (2); the cam portion (31) is connected to the tripping member (4) through a connecting rod (6); the tripping member (4) drives the lever member (5) to move to the closing position when the crank (3) swings forward, and drives the lever member (5) to move to the opening position when the crank (3) swings reversely.

2. A motor protector according to claim 1, characterized in that: The crank (3) comprises a handle portion (32) connected to the cam portion (31) and extending out of the top of the shell body, the top of the shell body is provided with two baffles (11) located on both sides of the handle portion (32), the two baffles (11) are provided with opposite first locking holes (12), and the crank (3) is provided with a second locking hole (33) that cooperates with the first locking hole (12) and is used to pass a locking member.

3. A motor protector according to claim 1, characterized in that: The cam portion (31) has a driving protrusion (311) extending away from the handle portion (32); one end of the connecting rod (6) is connected to the driving protrusion (311) via a first shaft (61), and the other end is connected to the middle of the jumper (4) via a second shaft (62).

4. A motor protector according to claim 3, characterized in that: The bracket (2) is provided with a first guide hole (21) for connecting the first shaft member (61); the first shaft member (61) passes through the connecting rod member and the driving protrusion (311) and is slidably connected to the first guide hole (21); the first guide hole (21) is an arc-shaped hole structure.

5. A motor protector according to claim 4, characterized in that: The bracket (2) is provided with a second guide hole (22) for connecting the second shaft member (62); the second shaft member (62) passes through the connecting rod member and the jumper member (4) and is slidably connected in the second guide hole (22); the second guide hole (22) is an arc-shaped hole structure.

6. A motor protector according to any one of claims 3 to 5, characterized in that: The other end of the jumper (4) is provided with a slot opening (41), the lever member (5) is provided with a connecting portion (51) inserted into the slot opening (41), and a third shaft member (42) connected to the connecting portion (51) is positioned and penetrated through the slot opening (41).

7. A motor protector according to claim 6, characterized in that: The jumper (4) comprises two push plates relatively formed on both sides of the slot opening (41), the two ends of the third shaft (42) are respectively positioned and connected to the two push plates, the connecting portion (51) is provided with a connecting groove (52) in a U-shaped structure, and the third shaft (42) is inserted into the connecting groove (52).

8. A motor protector according to claim 6, characterized in that: The bracket (2) comprises two side plates and an accommodating space formed between the two side plates and suitable for accommodating a tripping member (4), a locking member (8), a lever member (5) and a cam portion (31); when the lever member (5) is located at a closing position, a line connecting the first shaft member (61), the second shaft member (62) and the third shaft member (42) is a straight line; when the lever member (5) is located at an opening position, a line connecting the first shaft member (61), the second shaft member (62) and the third shaft member (42) is a triangle.

9. A motor protector according to claim 8, characterized in that: A torsion spring structure (7) is provided between the lever member (5) and the bracket (2); one end of the torsion spring structure (7) is hooked onto the lever member (5), and the other end is provided on one of the side plates of the bracket (2).

10. A motor protector according to claim 9, characterized in that: A contact mechanism is provided below the swing operating mechanism, the contact mechanism comprising a contact support (93) connected to a lever member (5), the lever member (5) comprising a push portion (53) extending away from the side of the jumper member (4) and cooperating with and abutting against the contact support, the push portion (53) being provided with a mounting hole connected to one end of the torsion spring structure.

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