阅读说明：本技术 双金属片的有效长度可调的断路器 (Circuit breaker with bimetallic strip adjustable in effective length ) 是由 袁亦峰 于 2020-03-25 设计创作，主要内容包括：本发明涉及断路器技术领域,特别是公开了一种双金属片的有效长度可调的断路器,包括基座以及设置在基座上的热脱扣装置,所述热脱扣装置包括连接板和双金属片,双金属片的一端与连接板连接,另一端上设置有调节螺钉,所述双金属片的一侧与连接板抵接,另一侧抵压有调节块,所述调节块可沿双金属片的长度方向移动实现调节块与调节螺钉之间的距离调节。采用上述结构,提供了一种能用同一种类,同样的尺寸的双金属片,在不同的故障电流下实现符合标准规定要求的脱扣的一种双金属片有效长度可调的结构。(The invention relates to the technical field of circuit breakers, and particularly discloses a circuit breaker with an adjustable effective length of a bimetallic strip. By adopting the structure, the structure with the adjustable effective length of the bimetallic strip can realize tripping meeting the standard regulation requirements under different fault currents by using the bimetallic strips of the same type and the same size.)

1. The utility model provides an effective length adjustable circuit breaker of bimetallic strip, includes the base and sets up the thermal trip gear on the base, thermal trip gear includes connecting plate and bimetallic strip, and the one end and the connecting plate of bimetallic strip are connected, are provided with adjusting screw, its characterized in that on the other end: one side and the connecting plate butt of bimetallic strip, the opposite side butt has the regulating block, the regulating block can be followed the length direction of bimetallic strip and removed the distance adjustment that realizes between regulating block and the adjusting screw.

2. The circuit breaker of claim 1, wherein the bimetal has an adjustable effective length, and further comprising: the adjusting block is connected with an adjusting screw rod, one end of the adjusting screw rod is connected with the adjusting block, the other end of the adjusting screw rod penetrates through the base to form a driving end, and the adjusting screw rod can stretch out and draw back on the base to achieve movement of the adjusting block.

3. The circuit breaker of claim 1 or 2, wherein the effective length of the bimetal is adjustable by: the base is provided with a positioning block, and a guide structure for guiding the adjusting block to move is arranged between the positioning block and the adjusting block.

4. A bimetal adjustable effective length circuit breaker according to claim 3, wherein: the guide structure comprises a concave cavity arranged on the adjusting block and an embedding part arranged on the positioning block, and the embedding part is arranged in the concave cavity to form guide arrangement.

5. The circuit breaker of claim 4, wherein the effective length of the bimetal is adjustable by: the positioning block is further provided with a limiting convex shoulder, and the limiting convex shoulder and the bimetallic strip are oppositely arranged to limit the adjusting block between the limiting convex shoulder and the bimetallic strip.

6. The bimetal adjustable effective length circuit breaker of claim 2, 4 or 5, wherein: the adjusting screw penetrates through the positioning block to be connected with the adjusting block, a concave portion is arranged at the end portion of the adjusting screw, a clamping groove matched with the concave portion is formed in the adjusting block, and the end portion of the adjusting screw is clamped into the clamping groove to form clamping linkage.

7. The bimetal adjustable effective length circuit breaker of claim 2, 4 or 5, wherein: the connecting plate is characterized in that a first bump and a second bump which form limiting fit are arranged between the connecting plate and the adjusting block, a strip-shaped groove is formed in the abutting surface of the adjusting block, which abuts against the bimetallic strip, and the strip-shaped groove is distributed along the moving direction of the adjusting block.

8. The bimetal adjustable effective length circuit breaker of claim 2, 4 or 5, wherein: the adjusting screw rod becomes cylindrically, the through-hole that supplies adjusting screw rod to pass on the base becomes two segmentation at least, and its diameter is the grow in proper order from the inboard to the outside of base, the diameter of the interior side section of through-hole is greater than adjusting screw rod's diameter, the outside section of through-hole inlays and is equipped with the insert nut with adjusting screw rod threaded connection, insert nut and outside section through-hole interference fit.

9. The circuit breaker of claim 8, wherein the effective length of the bimetal is adjustable by: the end part of the adjusting screw rod, which is positioned outside the insert nut, is in threaded connection with a locking nut, and a driving hole is formed in the end face of the end part of the adjusting screw rod.

10. The circuit breaker of claim 9, wherein the effective length of the bimetal is adjustable by: the through hole is in a three-section type, the insert nut is located in the middle section of the through hole, the outer diameter of the locking nut is larger than that of the middle section, and the diameter of the section outside the through hole is larger than that of the locking nut.

Technical Field

The invention relates to the technical field of circuit breakers, in particular to a circuit breaker with an adjustable effective length of a bimetallic strip.

Background

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a structure with adjustable effective length of a bimetallic strip, which can realize tripping meeting the requirements of standard regulation under different fault currents by using the same type of bimetallic strip with the same size.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an effective length adjustable circuit breaker of bimetallic strip, includes the base and sets up the hot trip gear on the base, hot trip gear includes connecting plate and bimetallic strip, and the one end and the connecting plate of bimetallic strip are connected, are provided with adjusting screw on the other end, one side and the connecting plate butt of bimetallic strip, opposite side are supported and are pressed there is the regulating block, the regulating block can be followed the length direction of bimetallic strip and removed the distance regulation that realizes between regulating block and the adjusting screw.

Among the above-mentioned technical scheme, the bimetallic strip rivets or welds on the connecting plate, but its riveting point or welding point take place crooked initial position when not being heated, and adjust the bimetallic strip by an adjusting block and be heated the initial position that takes place crooked, so as to realize that the effective length of bimetallic strip is adjustable, the distance between adjusting screw and the adjusting block is the effective length of bimetallic strip promptly, so the peak of adjusting block butt on the bimetallic strip will be higher than riveting point or welding point, realize through the effective length of adjusting the bimetallic strip that the thermal overload trouble at different current specifications can both be in accord with standard condition dropout, reduce the material, the mould has been reduced, the commonality of part has been improved.

As a further arrangement of the invention, the adjusting block is connected with an adjusting screw rod, one end of the adjusting screw rod is connected with the adjusting block, the other end of the adjusting screw rod penetrates through the base to form a driving end, and the adjusting screw rod can stretch out and draw back on the base to realize the movement of the adjusting block.

Among the above-mentioned technical scheme, the drive end is located outside the base, and convenient operation is adjusted, and adjusting screw is flexible along its self axial, and this flexible direction is unanimous with the moving direction of regulating block, and in addition, in order to ensure that adjusting screw does not influence the magnetic circuit and want heat-resisting, its material is stainless steel.

As a further arrangement of the invention, a positioning block is arranged on the base, and a guide structure for guiding the adjustment block to move is arranged between the positioning block and the adjustment block.

Among the above-mentioned technical scheme, the setting of locating piece mainly provides the guide effect, avoids the regulating block to rock, makes the removal regulation more accurate.

As a further arrangement of the present invention, the guiding structure includes a cavity disposed on the adjusting block and an embedding portion disposed on the positioning block, and the embedding portion is disposed in the cavity to form a guiding arrangement.

In the technical scheme, the adjusting block is positioned in the y direction by the adjusting block and the adjusting screw, and the positioning block and the adjusting block are limited in an auxiliary mode, the lowest position of the adjusting block in the z direction is determined by the limit between the adjusting block and the positioning block, the positioning block has a certain height compared with the inner side face of the base and can form guiding fit with the adjusting block, the adjusting block is equivalently sleeved on the positioning block, the fit is reliable, and the guiding is stable.

As a further arrangement of the invention, the positioning block is also provided with a limiting convex shoulder, and the limiting convex shoulder and the bimetallic strip are oppositely arranged to limit the adjusting block between the limiting convex shoulder and the bimetallic strip.

Among the above-mentioned technical scheme, the regulating block realizes fixing a position through the transition fit of spacing convex shoulder and bimetallic strip in the x direction, makes the regulating block hug closely the bimetallic strip, ensures the crooked effective length of bimetallic strip, and preferred spacing convex shoulder sets up in the corresponding both sides of locating piece, improves positioning strength.

As a further arrangement of the invention, the adjusting screw penetrates through the positioning block to be connected with the adjusting block, a concave part is arranged at the end part of the adjusting screw, a clamping groove matched with the concave part is arranged on the adjusting block, and the end part of the adjusting screw is clamped into the clamping groove to form clamping linkage.

Among the above-mentioned technical scheme, because of adjusting screw needs and the regulating block linkage, and adjusting screw still need drive the regulating block through rotating and remove, so can not be fixed connection, the relative both sides of draw-in groove are inlayed and are established the joint that constitutes the z direction in the concave part spacing, do not restrict adjusting screw again and rotate, and the draw-in groove becomes one end and has open-ended kidney slot, makes things convenient for adjusting screw card to go into, simple structure, simple to operate.

According to the further arrangement of the invention, a first bump and a second bump which form limit fit are arranged between the connecting plate and the adjusting block, and strip-shaped grooves are arranged on the abutting surface of the adjusting block abutting on the bimetallic strip and distributed along the moving direction of the adjusting block.

Among the above-mentioned technical scheme, the regulating block is by spacing decision between first lug and the second lug at the highest position of z direction, the setting in bar groove can supply rivet head or welding point on the bimetallic strip to inlay and establish, make its length direction guide movement along the bar groove, also make the regulating block can hug closely the bimetallic strip, in addition, no matter adjust which position can not interfere with armature in the position of rotation region in order to guarantee the regulating block, the regulating block designs into the shape of similar chair, the bar groove sets up on the back of the chair, and is rationally distributed.

As a further arrangement of the invention, the adjusting screw rod is cylindrical, the through hole for the adjusting screw rod to pass through on the base is at least two-section type, the diameter of the through hole is gradually increased from the inner side to the outer side of the base, the diameter of the inner section of the through hole is larger than that of the adjusting screw rod, the outer section of the through hole is embedded with an insert nut in threaded connection with the adjusting screw rod, and the insert nut is in interference fit with the through hole of the outer section.

Among the above-mentioned technical scheme, the diameter of interior side section slightly is greater than adjusting screw's diameter, when the installation, enables adjusting screw and passes fast like this, and the regulating block is adjusted through adjusting screw and insert nut's screw pair in the z direction, and preferred insert nut is fixed in the through-hole, and adjusting screw realizes flexible, simple structure, convenient operation through the rotation.

As a further arrangement of the invention, the end part of the adjusting screw rod, which is positioned outside the insert nut, is in threaded connection with a locking nut, and the end surface of the end part of the adjusting screw rod is provided with a driving hole.

Among the above-mentioned technical scheme, the regulating block carries out final locking location by lock nut, and during the regulation, accessible drive hole drive adjusting screw rotates and adjusts, and the drive hole can be the recess of shapes such as a straight line, cross, interior hexagonal, adjusts more efficiency.

As a further arrangement of the invention, the through hole is in a three-section type, the insert nut is positioned in the middle section of the through hole, the outer diameter of the locking nut is larger than that of the middle section, and the diameter of the section outside the through hole is larger than that of the locking nut.

Among the above-mentioned technical scheme, lock nut arranges in the through-hole, avoids protruding the lateral surface of base, influences the product and uses.

The invention is further described below with reference to the accompanying drawings.

Drawings

FIG. 1 is a cross-sectional perspective view of a bimetallic strip in its maximum effective length in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional perspective view of a bimetallic strip in its minimum effective length in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a bimetal at its maximum effective length in accordance with an embodiment of the present invention;

fig. 4 is a cross-sectional view of a bimetal at a minimum effective length in accordance with an embodiment of the present invention;

FIG. 5 is a block diagram of a base in accordance with an embodiment of the present invention;

FIG. 6 is a cross-sectional view A-A of FIG. 5;

FIG. 7 is a block diagram of a conditioning block according to an embodiment of the present invention;

FIG. 8 is a block diagram of a conditioning block according to an embodiment of the present invention;

FIG. 9 is a block diagram of a bimetallic strip in accordance with an exemplary embodiment of the present invention;

FIG. 10 is a block diagram of an adjustment screw in accordance with an embodiment of the present invention;

FIG. 11 is a block diagram of a locking nut in accordance with an embodiment of the present invention;

FIG. 12 is a block diagram of a connection plate according to an embodiment of the present invention.

Detailed Description

The specific embodiment of the invention is shown in fig. 1-12, and the circuit breaker with the adjustable effective length of the bimetallic strip comprises a base 1 and a thermal trip device arranged on the base 1, wherein the thermal trip device comprises a connecting plate 2 and a bimetallic strip 4, one end 41 of the bimetallic strip 4 is connected with the connecting plate 2, the other end 42 of the bimetallic strip is provided with an adjusting screw C, one side of the bimetallic strip 4 is abutted against the connecting plate 2, the other side of the bimetallic strip is abutted against an adjusting block 3, and the adjusting block 3 can move along the length direction of the bimetallic strip 4 to realize the distance adjustment between the adjusting block 3 and the adjusting screw C. Bimetallic strip 4 rivets or welds on connecting plate 2, but its riveting point or welding point take place crooked initial position when not being heated, and adjust bimetallic strip 4 and be heated the crooked initial position that takes place by an adjusting block 3, so as to realize that bimetallic strip 4's effective length is adjustable, the distance between adjusting screw C and adjusting block 3 is bimetallic strip 4's effective length promptly, so adjusting block 3 butt is higher than riveting point or welding point on bimetallic strip 4, realize through adjusting bimetallic strip 4's effective length that thermal overload trouble at different current specifications can both be in accord with standard condition dropout, reduce the material, the mould has been reduced, the commonality of part has been improved.

The adjusting block 3 is connected with an adjusting screw rod 5, one end of the adjusting screw rod 5 is connected with the adjusting block 3, the other end of the adjusting screw rod 5 penetrates through the base 1 to form a driving end 52, and the adjusting screw rod 5 can stretch out and draw back on the base 1 to achieve movement of the adjusting block 3. The driving end 52 is located outside the base 1 for easy operation and adjustment, the adjusting screw 5 extends and retracts along its own axial direction, the extending and retracting direction is consistent with the moving direction of the adjusting block 3, and in addition, in order to ensure that the adjusting screw 5 does not affect the magnetic circuit and is heat-resistant, the material is stainless steel.

The base 1 is provided with a positioning block 11, and a guide structure for guiding and moving the adjusting block 3 is arranged between the positioning block 11 and the adjusting block 3. The positioning block 11 is mainly used for providing a guiding effect, so that the adjusting block 3 is prevented from shaking, and the movement adjustment is more accurate.

The guiding structure comprises a cavity 31 arranged on the adjusting block 3 and an embedding part 111 arranged on the positioning block 11, and the embedding part 111 is arranged in the cavity 31 to form guiding arrangement. The positioning of the adjusting block 3 in the y direction is realized by the auxiliary limit of the adjusting block 3 and the adjusting screw 5, the positioning block 11 and the adjusting block 3, the lowest position of the adjusting block 3 in the z direction is determined by the limit between the adjusting block 3 and the positioning block 11, the positioning block 11 has a certain height compared with the inner side surface of the base 1, and can form guiding fit with the adjusting block 3, the adjusting block 3 is equivalently sleeved on the positioning block 11, the matching is reliable, and the guiding is stable.

The positioning block 11 is further provided with a limiting shoulder 112, and the limiting shoulder 112 is arranged opposite to the bimetallic strip 4 to limit the adjusting block 3 between the limiting shoulder 112 and the bimetallic strip 4. The adjusting block 3 is located in the x direction through the transition fit of the limiting convex shoulder 112 and the bimetallic strip 4, so that the adjusting block 3 can be tightly attached to the bimetallic strip 4, the bending effective length of the bimetallic strip 4 is ensured, the preferred limiting convex shoulders 112 are arranged on the two corresponding sides of the locating block 11, and the locating strength is improved.

The adjusting screw 5 penetrates through the positioning block 11 to be connected with the adjusting block 3, a concave portion 511 is arranged at the end portion 51 of the adjusting screw 5, a clamping groove 32 matched with the concave portion 511 is arranged on the adjusting block 3, and the end portion 51 of the adjusting screw 5 is clamped into the clamping groove 32 to form clamping linkage. Because of adjusting screw 5 needs to link with regulating block 3, and adjusting screw 5 still needs to drive regulating block 3 through rotating and remove, so can not be fixed connection, the relative both sides of draw-in groove 32 inlay and establish in concave part 511 and constitute the joint of z direction spacing, do not restrict adjusting screw 5 again and rotate, draw-in groove 32 becomes one end and has open-ended kidney slot, makes things convenient for adjusting screw 5 card to go into, simple structure, simple to operate.

A first bump 21 and a second bump 34 forming a limit fit are arranged between the connecting plate 2 and the adjusting block 3, a strip-shaped groove 33 is arranged on a contact surface of the adjusting block 3, which is in contact with the bimetallic strip 4, and the strip-shaped groove 33 is distributed along the moving direction of the adjusting block 3. Regulating block 3 is by spacing decision between first lug 21 and the second lug 34 at the highest position of z direction, the setting of bar groove 33 can supply rivet head B or welding point on the bimetallic strip 4 to inlay and establish, make its length direction guide movement along bar groove 33, also make regulating block 3 can hug closely bimetallic strip 4, in addition, no matter adjust to which position in order to guarantee regulating block 3 can not interfere with armature in the position of rotation region, regulating block 3 designs into the shape of similar chair, bar groove 33 sets up on the back of the chair, and reasonable in layout.

The adjusting screw 5 is cylindrical, the through hole 12 for the adjusting screw 5 to pass through on the base 1 is in a three-section type, the diameter of the through hole is sequentially increased from the inner side to the outer side of the base 1, the diameter of the inner side section 121 of the through hole 12 is larger than that of the adjusting screw 5, the insert nut 13 in threaded connection with the adjusting screw 5 is embedded in the middle section 122 of the through hole 12, and the insert nut 13 is in interference fit with the through hole 12 of the middle section 122. The diameter of the inner section 121 is slightly larger than that of the adjusting screw 5, so that when the adjusting block 3 is installed, the adjusting screw 5 can pass through the adjusting block quickly, the adjusting block 3 is adjusted in the z direction by the screw pair of the adjusting screw 5 and the insert nut 13, preferably, the insert nut 13 is arranged on the base 1, the adjusting screw 5 is in threaded fit with the adjusting screw, the concave portion 511 on the adjusting screw 5 is clamped in the clamping groove 32 of the adjusting block 3, since the insert nut 13 is fixed in the base 1, after the adjusting screw 5 is locked by the locking nut 6, the offset of the adjusting block 3 in the y direction is also determined, and the inner walls 381 and 382 of the adjusting block 3 are in contact with the side walls 161 and 162 of the positioning block 11 to play an auxiliary positioning role, so that the adjusting block 3 can be positioned in the y direction.

The end part of the adjusting screw rod 5, which is positioned outside the insert nut 13, is in threaded connection with a lock nut 6, and the end surface of the end part of the adjusting screw rod 5 is provided with a driving hole 521. The adjusting block 3 is finally locked and positioned by the locking nut 6, during adjustment, the adjusting screw rod 5 can be driven to rotate through the driving hole 521 for adjustment, the driving hole 521 can be a groove in the shape of a straight line, a cross, an inner hexagon and the like, and adjustment efficiency is improved.

The outer diameter of the lock nut 6 is larger than the diameter of the middle section 122, and the diameter of the section 123 outside the through hole 12 is larger than the outer diameter of the lock nut 6. The locking nut 6 is arranged in the through hole 12, so that the influence on the use of a product caused by the protrusion of the outer side surface of the base 1 is avoided.

During installation, the insert nut 13 is embedded on the base 1, the adjusting screw 5 is screwed into the insert nut 13, after the adjusting screw is screwed to a certain distance, the adjusting block 3 is placed on the positioning block 11 of the base 1, the surface 391 on the adjusting block 3 is in contact with the surface 113 on the positioning block 11, the clamping groove 32 of the adjusting block 3 penetrates through the concave part 511 of the adjusting screw 5, so that the surfaces 5111 and 5112 of the concave part 511 are respectively in contact with the surfaces 392 and 391 of the adjusting block 3 or leave a small gap, and the adjusting block 3 is pushed to the bottom in the x direction to enable the surfaces 351 and 352 on the adjusting block 3 to be in contact with the surfaces 141 and 142 of the limiting convex shoulder 112 respectively; at this time, the thermo-magnetic release is mounted on the base 1, so that the end 41 of the bimetal 4 abuts against the surface 36 of the adjusting block 3, the connecting plate 2 on the thermo-magnetic release is fixed on the base 1 by using a screw, and only a small gap is left in the x direction of the adjusting block 3, and the gap can ensure that the adjusting block 3 is driven to move freely in the z direction by using the adjusting screw 5. If the tightening with the lock nut 6 in this position brings the face 61 on the lock nut 6 into contact with the face 1231 of the through hole 12, the positional locking of the adjustment block 3 is achieved.

At this time, the distance from the adjusting screw C on the bimetal 4 to the surface 341 on the adjusting block 3 along the z direction is the effective length of the bimetal 4, and the effective length is at the maximum value of the adjusting range at this time, and the bending starting action line of the bimetal 4 is the position of the edge 342 of the adjusting block 3; note that the end 52 of the adjustment screw 5 should be beyond the position of the face 124 of the base 1 in the z-axis positive direction at this time.

Next, the lock nut 6 is unscrewed, the adjusting screw 5 is continuously screwed, the surface 5112 on the concave portion 511 drives the surface 391 of the adjusting block 3 to move in the positive z-direction, and as the adjusting block 3 continuously moves in the positive z-direction, the distance from the adjusting screw C on the bimetal 4 to the surface 341 of the adjusting block 3 is continuously reduced, that is, the effective length of the bimetal 4 is continuously reduced. If the adjusting screw 5 is now locked by the locking nut 6, a value between the minimum effective length and the maximum effective length is obtained.

Of course, the adjusting block 3 can also continue to move in the positive z-direction until the surfaces 343 and 344 of the adjusting block 3 come into contact with the surfaces 211 and 212 on the connecting plate 2, at which point the adjusting block 3 has reached the extreme position in the z-direction, and if the adjusting screw 5 is now locked with the locking nut 6, at which point the distance of the adjusting screw C of the bimetal 4 from the surface 341 on the adjusting block 3 is at a minimum, i.e. the minimum effective length of the bimetal 4 is reached. Note that any part of the adjusting screw 5, which is located on the armature 7, should not interfere with either the attraction or the movement process, and a sufficient clearance should be ensured.

If the effective length of the bimetal 4 is to be lengthened, the adjusting screw C is screwed to move in the negative direction z. Thus, the effective length of the effective bimetallic strip 4 is adjusted according to different current levels.

According to the well-known calculation formula of the bimetallic element, the displacement of the bimetallic strip 4 is proportional to the square of the effective length of the bimetallic strip 4; the thrust generated by the bimetallic strip 4 is inversely proportional to the effective length; the maximum load (stress) of the bimetal 4 is proportional to the effective length. For example, under the same housing, when the circuit breaker is subjected to heavy-current overload current, the displacement is large in the same time, and the effective length of the bimetallic strip 4 is adjusted to be small; when the circuit breaker is overloaded with a small current, the effective length of the bimetal 4 should be adjusted to a longer length.

Therefore, the purpose that the bimetallic strip 4 with the same type and the same size can be tripped in different fault currents according with the standard regulation requirements can be achieved by adjusting the effective length of the bimetallic strip 4 within a proper range.

The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention.