An anti-rotation adjustment knob and a thermomagnetic adjustable trip unit

Abstract

This utility model relates to an anti-rotation adjustment knob and a thermomagnetic adjustable trip unit. The adjustment knob includes a knob end and an actuating end, which are connected to each other. The knob end is located at the upper part of the adjustment knob, and the actuating end is located at the lower part of the adjustment knob. The bottom surface of the actuating end is set as a spirally rising wavy surface, which includes multiple convex surfaces and multiple concave surfaces. The convex and concave surfaces are alternately distributed, with convex surfaces of the same order above the concave surfaces. Compared with the prior art, this utility model improves the accuracy and reliability of short-circuit current action threshold adjustment.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, and relates to an anti-reverse adjustment knob and a thermomagnetic adjustable trip unit. Background Technology

[0002] The adjustment knob of the thermomagnetic adjustable trip unit can be used to set the tripping parameters of the circuit breaker, such as overload long-time delay and short-circuit instantaneous protection. Among them, overload protection (long-time delay I) r ) is to adjust the rated current I n The percentage is typically 80-100%. n Short circuit protection (instantaneous I) i This sets the short-circuit current operating threshold, such as 5 to 10 times I. n For short-circuit protection, also known as instantaneous protection, the bottom surface of the instantaneous adjustment knob is typically a spiraling upward slope, providing a smooth rotation function. Rotating the instantaneous adjustment knob applies downward pressure to the lever of the thermomagnetic adjustable trip unit, causing the lever to rotate and increasing the elastic force of the instantaneous spring on the lever. This requires a larger current for the magnetic trip core to engage, thereby adjusting the short-circuit current action threshold. The current value is then indicated by the scale label and the arrow direction on the adjustment knob.

[0003] When the required short-circuit operating current is small, the spring force of the instantaneous spring is also small. Consequently, the spring tension on the lever of the thermomagnetic adjustable trip unit is also small, and the reaction force on the adjusting knob is also small. In this case, the adjusting knob will be relatively loose. When the circuit breaker opens or closes, or during significant vibration, the adjusting knob may rotate backward, causing the short-circuit operating current adjustment to fail. Therefore, an adjusting knob that prevents rotation backward is needed.

[0004] Patent CN221766671U discloses a circuit breaker with adjustable instantaneous rated current, including a base, an operating mechanism, a traction rod, an armature, an instantaneous traction rod, an instantaneous adjustment knob, and a tension adjustment mechanism. The armature includes an extension that rotates with a rotation axis and contacts or moves away from the traction rod. A spring tensioning element is provided between the tension adjustment mechanism and the armature, which enables the armature to be tensioned towards the side away from the traction rod. The instantaneous adjustment knob includes an instantaneous adjustment part and several gear adjustment parts. A gear adjustment linkage part is formed on the instantaneous traction rod. In this patent, the instantaneous adjustment knob has several arc-shaped grooves that serve as gear adjustment parts, which can adjust several multiples of the rated current. However, the arc-shaped grooves are relatively small and can only serve the function of gear adjustment. They are not very effective in preventing the instantaneous adjustment knob from rotating back, especially when the sliding part of the traction rod is relatively wide. In addition, the bottom of the instantaneous adjustment knob in this patent has several arc-shaped grooves, so the feel is always stuttering whether it is rotated clockwise or counterclockwise.

[0005] Patent CN209880520U discloses an adjustment device for a circuit breaker, including an adjustment knob, an adjustment rod, an armature, and an iron core. The adjustment knob rotates the adjustment rod, which in turn moves the armature, adjusting the gap between the armature and the iron core. The outer surface of the adjustment knob is petal-shaped with multiple arc-shaped grooves, and the end of the adjustment rod is guided and positioned within these grooves. Each arc-shaped groove is unequal in distance from the center of the adjustment knob, corresponding to different magnetic protection operating current multiples. However, the contact area between the adjustment rod and the adjustment knob in this patent is too small, resulting in unreliable contact and difficulty in accurately controlling the gap between the iron core and the yoke. Furthermore, the adjustment knob in this patent has a complex shape, leading to higher manufacturing costs. Utility Model Content

[0006] The purpose of this invention is to overcome at least one of the defects in the prior art by providing an anti-rotation adjustment knob and a thermomagnetic adjustable trip unit. This invention improves the accuracy and reliability of the short-circuit current action threshold adjustment.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] One of the technical solutions of this utility model is to provide an anti-rotation adjustment knob, which includes a knob end and an actuation end. The knob end and the actuation end are connected to each other. The knob end is located at the upper part of the adjustment knob, and the actuation end is located at the lower part of the adjustment knob. The bottom surface of the actuation end is set as a spirally rising wave-shaped curved surface, that is, the bottom surface of the actuation end is spirally rising in spatial layout. The spiral curve itself is undulating in a wave shape after unfolding on the plane. The wave-shaped curved surface includes multiple convex surfaces and multiple concave surfaces. The convex surfaces and concave surfaces are alternately distributed, and the convex surfaces of the same level are above the concave surfaces.

[0009] By rotating the adjustment knob, when the concave surface contacts the protrusion of the pull rod, it is at one gear position, ensuring that the position of each adjustment gear is the same; at this time, the upper convex surface of the same level corresponding to the concave surface abuts against the protrusion of the pull rod, which can effectively prevent the adjustment knob from rotating back.

[0010] Furthermore, the highest point of the concave surface of the outer curve of the wavy surface is lower than the highest point of the concave surface of the same degree of the inner curve. The height difference between the highest points of the concave surfaces of the same degree of the outer curve and the inner curve gradually decreases from top to bottom, which increases the contact area between the boss of the pull rod and the wavy surface, increases the friction, and can further prevent the adjustment knob from rotating back.

[0011] Because the boss is angled upwards, as the adjustment knob is rotated, the boss is gradually pressed downwards, and the angle of the boss gradually decreases. If the inner curve is lower than the outer curve, the contact area between the boss and the adjustment knob will decrease, and the effect of preventing the adjustment knob from rotating will be worse.

[0012] Furthermore, the outer diameter of the knob end is smaller than the outer diameter of the actuating end, and a protruding ring is provided on the wall surface of the knob end. The protruding ring, the wall surface of the knob end, and the top surface of the actuating end surround to form a cover mounting groove. The adjusting knob is engaged with the knob mounting position on the cover through the cover mounting groove.

[0013] Furthermore, a rotation limiting protrusion is provided outside the convex ring. The rotation limiting protrusion is fan-shaped, and its two sides are respectively set as a starting limiting surface and an ending limiting surface.

[0014] When the initial limiting surface contacts the limiting block of the cover, the boss of the pull rod contacts the uppermost concave surface.

[0015] When the termination limiting surface contacts the limiting block of the cover, the boss of the pull rod contacts the lowest concave surface.

[0016] Furthermore, a slot is formed on the top surface of the knob end, which facilitates the rotation and adjustment of the knob using a screwdriver. A triangular groove is formed at one end of the slot on the top surface of the knob end, and the slot and the triangular groove form the shape of an arrow, the direction of which indicates the current value.

[0017] As a preferred technical solution, since the triangular groove is only used as part of the shape of the arrow and serves as an identifier, while the flat slot needs to be inserted with a screwdriver, the depth of the triangular groove is less than the depth of the flat slot.

[0018] One of the technical solutions of this utility model is to provide a thermomagnetic adjustable trip device, which includes the aforementioned adjustment knob, as well as a pull rod, a cover, multiple springs, a balance rod, and a magnetic trip core. The adjustment knob is installed on the cover, with the knob end protruding outside the cover. The wavy curved surface contacts the pull rod, and the pull rod is connected to one end of the balance rod through a spring. The other end of the balance rod contacts the magnetic trip core.

[0019] Furthermore, the cover has a knob mounting position, which is set as a U-shaped groove. The adjustment knob is engaged with the semi-circular through hole of the U-shaped groove along the straight groove of the U-shaped groove through the cover mounting slot, so that the adjustment knob can rotate flexibly within the knob mounting position.

[0020] A limit block is provided on the cover outside the through hole. The limit block blocks the rotation limit protrusion when the adjustment knob is rotated, thereby limiting the short-circuit current action threshold range of the thermomagnetic adjustable trip unit.

[0021] As a preferred technical solution, an installation limiting protrusion is provided between the straight groove and the semi-circular through hole. The installation limiting protrusion prevents the adjustment knob from easily turning out of the semi-circular through hole when rotating. At the same time, the installation limiting protrusion is small, so that when the adjustment knob is installed, it can pass over the installation limiting protrusion along the straight groove and be engaged in the semi-circular through hole after applying a little force.

[0022] Furthermore, a support is provided on one side of the cover, and a pull rod mounting slot is provided on the support. The pull rod mounting slot is arc-shaped, and the pull rod is mounted on the pull rod mounting slot, so that the pull rod can rotate flexibly within the pull rod mounting slot.

[0023] Furthermore, a base is provided on one side of the pull rod, and a boss is provided on the base. The base with the boss acts as a push rod, and the boss rests against the wavy curved surface.

[0024] On the other side, there are multiple hooks, and one end of the spring is mounted on the hook.

[0025] Furthermore, the other end of the spring is mounted on the spring end of the balance bar, the balance bar rotates around the central axis, and a lifting rod is provided on the magnetic release core, with the core end of the balance bar abutting against the lifting rod.

[0026] One of the technical solutions of this utility model is to provide an anti-rotation adjustment method, which uses the aforementioned adjustment knob to prevent rotation, and the method includes the following steps:

[0027] In the initial state at the minimum short-circuit current setting, the starting limit surface of the adjustment knob contacts the limit block of the cover, and the adjustment knob exerts a downward force on the pull rod. When the adjustment knob is rotated through the slot using a flathead screwdriver, the wavy curved surface of the adjustment knob pushes the pull rod to rotate, while the spring exerts a reverse force on the pull rod. Therefore, the more the adjustment knob is rotated, the greater the spring force on the pull rod. When the ending limit surface of the adjustment knob contacts the limit block of the cover, it indicates that it has been rotated to the maximum short-circuit current setting.

[0028] When the magnetic trip core rotates during the attraction action, the lifting rod of the magnetic trip core lifts the core end of the balance bar. When the spring force on the pull rod is greater, the lifting rod of the magnetic trip core needs to exert more force to lift the balance bar. Therefore, a larger current is required to make the magnetic trip core move, thereby achieving the purpose of adjusting the short-circuit current action threshold.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The present invention adopts a wave-shaped rising surface in structure. The concave surface on the surface can locate the rotation position, so that each gear adjustment can be fixed in the same position. In contrast, the smooth inclined surface of the spiral rise in the prior art cannot locate the position where each rotation stops. The present invention improves the accuracy of the short-circuit current action threshold adjustment of the trip unit.

[0031] (2) This utility model adopts an anti-rotation structure. By setting a corresponding convex surface in front of each gear position, it can effectively prevent the adjustment knob from rotating back. In contrast, the existing technology only has a smooth inclined surface, which cannot prevent rotation. This utility model further improves the reliability of the short-circuit current action threshold adjustment of the trip unit and increases the range of the short-circuit current action threshold.

[0032] (3) This utility model adopts a special curved surface structure. The inner side of the bottom curved surface of the adjustment knob is higher than the outer side, which increases the contact area between the pull rod and the curved surface, and the friction is greater, further reducing the possibility of the adjustment knob rotating back.

[0033] (4) The structure of this utility model is relatively simple, easy to install, and simplifies the processing technology of the adjustment knob. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the side structure of the anti-rotation adjustment knob in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the unfolded curve of the wavy surface in an embodiment of this utility model;

[0036] Figure 3 This is a schematic diagram comparing the outer and inner unfolded curves of the wavy surface in an embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of the structure above the anti-rotation adjustment knob in an embodiment of this utility model;

[0038] Figure 5 This is a schematic diagram of the pull rod structure in an embodiment of this utility model;

[0039] Figure 6 This is a schematic diagram of the structure of the cover in an embodiment of the present utility model;

[0040] Figure 7 This is an assembly diagram of the adjusting knob, pull rod, and spring in an embodiment of this utility model;

[0041] Figure 8 This is a schematic diagram of the assembly of the spring, balance bar, and magnetic release core in an embodiment of this utility model;

[0042] Figure 9This is a schematic diagram showing the position of the adjustment knob and the pull rod when the short-circuit current action threshold is adjusted to 5 times in this embodiment of the present invention;

[0043] Figure 10 This is a schematic diagram showing the positions of the adjustment knob and the pull rod when the short-circuit current action threshold is adjusted to 5 times in this embodiment of the present invention;

[0044] Figure 11 This is a schematic diagram showing the positions of the adjustment knob and lever when the short-circuit current action threshold is adjusted to 10 times in this embodiment of the present invention.

[0045] Explanation of markings in the diagram:

[0046] 1—Adjustment knob, 2—Pull rod, 3—Cover, 4—Spring, 5—Balance bar, 6—Magnetic release core;

[0047] 11—Cover mounting slot; 12—Wave-shaped curved surface; 13—Starting limiting surface; 14—Ending limiting surface; 15—Slotted groove;

[0048] 12a—outer curve, 12b—inner curve;

[0049] 121—convex surface, 122—concave surface;

[0050] 1221—First concave surface, 1222—Second concave surface, 1223—Third concave surface, 1224—Fourth concave surface, 1225—Fifth concave surface;

[0051] 21—Boss, 22—Hook;

[0052] 31—Knob mounting position; 32—Limit block; 33—Pull rod mounting slot; 34—Mounting limit protrusion;

[0053] 51—Spring end, 52—Iron core end;

[0054] 61—Raise the lever. Detailed Implementation

[0055] The present invention will now be described in detail with reference to specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., used to describe a common object only indicate different instances of the same object, and are not intended to imply that the objects described in this way must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0057] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] Example 1:

[0059] An anti-rotation adjustment knob, such as Figures 1 to 3 As shown, the adjustment knob 1 includes a knob end and an execution end, which are connected to each other. The knob end is located at the upper part of the adjustment knob 1, and the execution end is located at the lower part of the adjustment knob 1. The bottom surface of the execution end is set as a spirally rising wave-shaped curved surface 12, that is, the bottom surface of the execution end is spirally rising in spatial layout. The spiral curve itself is undulating in a wave shape after unfolding on the plane. The wave-shaped curved surface 12 includes multiple convex surfaces 121 and multiple concave surfaces 122. The convex surfaces 121 and concave surfaces 122 are distributed alternately, and the convex surfaces 121 of the same level are above the concave surfaces 122.

[0060] By rotating the adjustment knob 1, when the concave surface 122 contacts the protrusion 21 of the pull rod 2, it is a gear position, ensuring that the position of each adjustment gear is the same; at this time, the upper convex surface 121 of the same level corresponding to the concave surface 122 abuts against the protrusion 21 of the pull rod 2, which can effectively prevent the adjustment knob 1 from rotating back.

[0061] In this embodiment, the wavy surface 12 includes five convex surfaces 121 and five concave surfaces 122, namely, a first convex surface, a second convex surface, a third convex surface, a fourth convex surface and a fifth convex surface arranged from top to bottom, and a first concave surface 1221, a second concave surface 1222, a third concave surface 1223, a fourth concave surface 1224 and a fifth concave surface 1225.

[0062] The outer diameter of the knob end is smaller than the outer diameter of the actuator end. A protruding ring is provided on the wall surface of the knob end. The protruding ring, the wall surface of the knob end, and the top surface of the actuator end surround to form a cover mounting groove 11. The adjustment knob 1 is engaged with the knob mounting position 31 through the cover mounting groove 11 and mounted on the cover 3.

[0063] The highest point of the concave surface 122 of the outer curve 12a of the wavy surface 12 is lower than the highest point of the concave surface 122 of the same level of the inner curve 12b. The height difference between the highest points of the concave surfaces 122 of the same level between the outer curve 12a and the inner curve 12b gradually decreases from top to bottom, which increases the contact area between the boss 21 of the pull rod 2 and the wavy surface 12, increases the friction, and can further prevent the adjustment knob 1 from rotating back.

[0064] Because the boss 21 is at an upward angle, as the adjustment knob 1 is rotated clockwise, the boss 21 is gradually pressed down, and the upward angle gradually decreases. If the inner curve 12b is lower than the outer curve 12a, the contact area between the boss 21 and the adjustment knob 1 will decrease, and the effect of preventing the adjustment knob 1 from rotating will be worse.

[0065] In this embodiment, the height difference between the highest points of the concave surfaces 122 of the same order between the outer curve 12a and the inner curve 12b is 0.22mm, 0.16mm, 0.06mm, 0.055mm and 0.05mm respectively from top to bottom;

[0066] like Figure 4 As shown, a slot 15 is provided on the top surface of the knob end. The slot 15 makes it convenient to rotate the adjustment knob 1 with a screwdriver. A triangular groove is provided at one end of the slot 15 on the top surface of the knob end. The slot 15 and the triangular groove form the shape of an arrow. The direction of the arrow indicates the current value.

[0067] Since the triangular groove is only used as part of the shape of the arrow and serves as an identifier, while the flat slot 15 is needed to insert a screwdriver, the depth of the triangular groove is less than the depth of the flat slot 15.

[0068] A rotation limiting protrusion is provided outside the convex ring. The shape of the rotation limiting protrusion is a fan-shaped ring. The two sides of the rotation limiting protrusion are respectively set as the starting limiting surface 13 and the ending limiting surface 14.

[0069] like Figure 9 and Figure 10 As shown, when the initial limiting surface 13 contacts the limiting block 32 of the cover 3, the boss 21 of the pull rod 2 contacts the uppermost concave surface 122.

[0070] In this embodiment, when the short-circuit current action threshold of the thermomagnetic adjustable trip unit is adjusted to 5 times the rated current, the initial limiting surface 13 contacts the limiting block 32 of the cover 3, and the boss 21 of the pull rod 2 contacts the first concave surface 1221.

[0071] like Figure 11 As shown, when the termination limiting surface 14 contacts the limiting block 32 of the cover 3, the boss 21 of the pull rod 2 contacts the lowest concave surface 122.

[0072] In this embodiment, when the short-circuit current action threshold of the thermomagnetic adjustable trip unit is adjusted to 10 times the rated current, the termination limiting surface 14 contacts the limiting block 32 of the cover 3, and the boss 21 of the pull rod 2 contacts the fifth concave surface 1225.

[0073] A thermomagnetic adjustable trip unit, such as Figure 7 and Figure 8 As shown, it includes the aforementioned adjustment knob 1, as well as a pull rod 2, a cover 3, multiple springs 4, a balance rod 5, and a magnetic release core 6. The adjustment knob 1 is mounted on the cover 3, with the knob end protruding outside the cover 3. The wavy curved surface 12 contacts the pull rod 2. The pull rod 2 is connected to one end of the balance rod 5 through the springs 4, and the other end of the balance rod 5 contacts the magnetic release core 6.

[0074] like Figure 6 As shown, the cover 3 has a knob mounting position 31, which is set as a U-shaped groove. The adjustment knob 1 is engaged into the semi-circular through hole of the U-shaped groove along the straight groove of the U-shaped groove through the cover mounting slot 11, so that the adjustment knob 1 can rotate flexibly within the knob mounting position 31.

[0075] An installation limiting protrusion 34 is provided between the straight groove and the semi-circular through hole. The installation limiting protrusion 34 prevents the adjustment knob 1 from easily turning out of the semi-circular through hole when it is rotated. At the same time, the installation limiting protrusion 34 is small, so when the adjustment knob 1 is installed, it can pass over the installation limiting protrusion 34 along the straight groove and then be engaged in the semi-circular through hole after applying a little force.

[0076] A limit block 32 is provided on the cover 3 outside the through hole. When the adjustment knob 1 is rotated, the limit block 32 blocks the rotation limit protrusion, which limits the short circuit current action threshold range of the thermomagnetic adjustable trip unit.

[0077] A support is provided on one side of the cover 3, and a tie rod mounting slot 33 is provided on the support. The tie rod mounting slot 33 is arc-shaped. The tie rod 2 is mounted on the tie rod mounting slot 33, so that the tie rod 2 can rotate flexibly in the tie rod mounting slot 33.

[0078] like Figure 5 As shown, a base is provided on one side of the tie rod 2, and a boss 21 is provided on the base. The base with the boss 21 acts as a push rod, and the boss 21 rests against the wavy curved surface 12.

[0079] On the other side, there are multiple hooks 22, and one end of the spring 4 is mounted on the hook 22;

[0080] The other end of the spring 4 is installed on the spring end 51 of the balance bar 5. The balance bar 5 rotates around the central axis. A lifting rod 61 is provided on the magnetic release iron core 6. The iron core end 52 of the balance bar 5 abuts against the lifting rod 61.

[0081] Example 2:

[0082] An anti-rotation adjustment method, using the anti-rotation adjustment knob 1 described in Example 1, comprises the following steps:

[0083] In the initial state at the minimum short-circuit current setting, the initial limiting surface 13 of the adjustment knob 1 contacts the limiting block 32 of the cover 3, and the adjustment knob 1 generates a downward force on the pull rod 2. When the adjustment knob 1 is rotated clockwise through the slot 15 using a flathead screwdriver, the wavy curved surface 12 of the adjustment knob 1 pushes the pull rod 2 to rotate clockwise, while the spring 4 generates a counterclockwise force on the pull rod 2. Therefore, the more the adjustment knob 1 is rotated clockwise, the greater the spring force of the spring 4 on the pull rod 2. When the final limiting surface 14 of the adjustment knob 1 contacts the limiting block 32 of the cover 3, it indicates that the maximum short-circuit current setting has been reached.

[0084] When the magnetic trip core 6 engages, it rotates clockwise, and the lifting rod 61 of the magnetic trip core 6 lifts the core end 52 of the balance rod 5 clockwise. When the spring force 4 on the pull rod 2 is greater, the lifting rod 61 of the magnetic trip core 6 needs to exert more force to lift the balance rod 5. Therefore, a larger current is needed to make the magnetic trip core 6 actuate, thereby achieving the purpose of adjusting the short-circuit current action threshold.

[0085] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A spin prevention adjustment knob, characterized in that, The adjustment knob (1) includes a knob end and an execution end, which are connected to each other. The knob end is located at the upper part of the adjustment knob (1), and the execution end is located at the lower part of the adjustment knob (1). The bottom surface of the execution end is set as a spirally rising wave-shaped surface (12). The wave-shaped surface (12) includes multiple convex surfaces (121) and multiple concave surfaces (122). The convex surfaces (121) and concave surfaces (122) are alternately distributed, and the convex surfaces (121) of the same level are above the concave surfaces (122).

2. A spin prevention adjustment knob as defined in claim 1, wherein The highest point of the concave surface (122) of the outer curve (12a) of the wavy surface (12) is lower than the highest point of the concave surface (122) of the same order of the inner curve (12b). The height difference between the highest points of the concave surfaces (122) of the same order of the outer curve (12a) and the inner curve (12b) gradually decreases from top to bottom.

3. The anti-rotation adjustment knob of claim 1, wherein, The outer diameter of the knob end is smaller than the outer diameter of the actuator end. A protruding ring is provided on the wall surface of the knob end. The protruding ring, the wall surface of the knob end, and the top surface of the actuator end surround to form a cover mounting groove (11). The adjustment knob (1) is engaged with the knob mounting position (31) on the cover (3) through the cover mounting groove (11).

4. A spin prevention adjustment knob as defined in claim 3, wherein, A rotation limiting protrusion is provided outside the convex ring. The rotation limiting protrusion is in the shape of a fan ring. The two sides of the rotation limiting protrusion are respectively set as the starting limiting surface (13) and the ending limiting surface (14). When the initial limiting surface (13) contacts the limiting block (32) of the cover (3), the boss (21) of the pull rod (2) contacts the uppermost concave surface (122); When the termination limiting surface (14) contacts the limiting block (32) of the cover (3), the boss (21) of the pull rod (2) contacts the lowest concave surface (122).

5. The anti-rotation adjustment knob of claim 1, wherein, A groove (15) is provided on the top surface of the knob end, and a triangular groove is provided at one end of the groove (15) on the top surface of the knob end. The groove (15) and the triangular groove form the shape of an arrow.

6. A thermomagnetically adjustable release, characterized in that The trip unit includes an adjustment knob (1) as described in any one of claims 1 to 5, a pull rod (2), a cover (3), a spring (4), a balance bar (5), and a magnetic trip core (6). The adjustment knob (1) is mounted on the cover (3), with the knob end protruding outside the cover (3). The wavy curved surface (12) contacts the pull rod (2). The pull rod (2) is connected to one end of the balance bar (5) via the spring (4), and the other end of the balance bar (5) contacts the magnetic trip core (6).

7. A thermomagnetic release according to claim 6, wherein The cover (3) has a knob mounting position (31), which is set as a U-shaped groove. The adjustment knob (1) is inserted into the semi-circular through hole of the U-shaped groove along the straight groove of the U-shaped groove through the cover mounting slot (11), so that the adjustment knob (1) can rotate within the knob mounting position (31). A limiting block (32) is provided on the cover (3) outside the through hole. The limiting block (32) blocks the rotation limiting protrusion when the adjustment knob (1) is rotated.

8. A thermomagnetic release according to claim 6, wherein A support is provided on one side of the cover (3), and a pull rod mounting slot (33) is provided on the support. The pull rod mounting slot (33) is arc-shaped. The pull rod (2) is mounted on the pull rod mounting slot (33) so that the pull rod (2) can rotate within the pull rod mounting slot (33).

9. A thermomagnetic release according to claim 6, wherein A base is provided on one side of the pull rod (2), and a boss (21) is provided on the base. The boss (21) rests against the wavy curved surface (12). A hook (22) is provided on the other side, and one end of the spring (4) is mounted on the hook (22).

10. A thermomagnetic release according to claim 9, wherein The other end of the spring (4) is mounted on the spring end (51) of the balance bar (5). The balance bar (5) rotates around the central axis. A lifting rod (61) is provided on the magnetic release core (6). The core end (52) of the balance bar (5) abuts against the lifting rod (61).

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