Current limiting device and horse protection assembly

Abstract

The utility model discloses a current limiting device and a motor protection assembly, and relates to the technical field of low-voltage electrical appliances, the current limiting device is connected in series to one end of a motor protection device, the current limiting device comprises a shell and a plurality of current limiting circuit breaking modules, the shell is of an integrated structure, the shell is provided with a containing cavity, and a plurality of first clamping pieces are arranged in the containing cavity; a plurality of current-limiting circuit break modules are installed in the accommodating cavity at the same time, second clamping pieces are arranged on the current-limiting circuit break modules, and the first clamping pieces and the second clamping pieces can be clamped with each other; the number of the current-limiting circuit break modules is the same as that of the first clamping pieces, and each first clamping piece can be clamped to the corresponding second clamping piece. According to the current limiting device, the firmness of the current limiting device can be improved, the situation that the shell is exploded is not likely to occur, the current limiting device is more convenient to install and maintain, and the cost of the current limiting device is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a current limiting device and a current protection component. Background Art

[0002] In the relevant technical field, the current limiting device is an external device used in conjunction with the motor protection device. The current limiting device can be connected in series to the motor protection device to improve the ultimate breaking capacity of the motor protection device.

[0003] Currently, the current limiting device is a structure of multiple current limiting circuit breaker modules spliced ​​together, each current limiting circuit breaker module has an independent shell. For example, the current limiting device connected to a three-phase circuit is three current limiting circuit breaker modules, and the corresponding shell assembly is spliced ​​by three shells and needs to be connected by at least two rivets.

[0004] However, the above-mentioned current limiting device is not assembled firmly enough, and often falls off during transportation due to loose riveting, or even explodes when it bears the ultimate breaking capacity. Utility Model Content

[0005] The present application provides a current limiting device and a safety assembly, which can improve the robustness of the current limiting device, make it less likely for the shell to explode, and make the installation and maintenance of the current limiting device more convenient, thereby reducing the cost of the current limiting device.

[0006] In the first aspect, the present application provides a current limiting device, which is connected in series at one end of a motor protection device, and the current limiting device includes a shell and a plurality of current limiting circuit breaker modules. The shell is an integrated structure, and the shell has a accommodating cavity, and a plurality of first clips are arranged in the accommodating cavity; a plurality of current limiting circuit breaker modules are installed in the accommodating cavity at the same time, and a second clip is arranged on the current limiting circuit breaker module, and the first clip and the second clip can be clipped to each other; the number of the current limiting circuit breaker modules is the same as that of the first clip, and each of the first clips can be respectively clipped to the corresponding second clip.

[0007] Based on the above-mentioned embodiments of the present application, the current limiting device can improve the ultimate breaking capacity of the motor protection device, thereby improving the performance of the motor protection device. The housing can accommodate and install multiple current limiting circuit breaker modules. The integrated housing can reduce the gap of the entire current limiting device, improve the firmness of the current limiting device, increase the aesthetics of the current limiting device, and make the installation and maintenance of the current limiting device more convenient, and can reduce the difficulty of pad printing and laser marking.

[0008] The first clamping piece in the accommodating chamber and the second clamping piece on the current limiting circuit breaker module can be mutually clamped to realize the assembly of the housing and the current limiting circuit breaker module. Multiple current limiting circuit breaker modules can be spliced ​​together and installed in the accommodating chamber at the same time, or multiple current limiting circuit breaker modules can be independently installed in the accommodating chamber. The number of current limiting circuit breaker modules is positively correlated with the model and phase number of the motor protection device. For example, if the motor protection device is installed in a three-phase circuit, the number of current limiting circuit breaker modules is set to three.

[0009] The integrated shell in the present application can improve the robustness of the current limiting device, making it less likely for the shell to explode, and makes the installation and maintenance of the current limiting device more convenient, thereby reducing the cost of the current limiting device.

[0010] In some examples, at least one of the first clamping member and the second clamping member includes a one-way clamping barb structure, and the first clamping member and the second clamping member cooperate to form a one-way clamping anti-disassembly mechanism.

[0011] The one-way clip-on hook structure can form a strong, one-way clip-on force, thereby constructing an anti-disassembly mechanism. The anti-disassembly mechanism is one-way, that is, after the clip-on is completed, it is difficult to separate unless a specific unlocking operation is taken. The anti-disassembly mechanism can ensure the stability and safety of the current limiting device during use, and effectively prevent the current limiting device from being illegally opened during transportation. The hook structure also has a high degree of stability and reliability. The connection between the clips that are in place is firm and can withstand various external forces and vibrations, so that the current limiting device has a higher connection strength.

[0012] In some examples, the first clamping member is a first buckle, the second clamping member is a limiting column, and the first buckle can be clamped on one side of the limiting column;

[0013] The first buckle comprises a cantilever and a clamping portion connected to each other, the first end of the cantilever is connected to the inner wall of the accommodating cavity, and the second end of the cantilever is a free end;

[0014] The clamping portion is arranged at the second end of the cantilever, and is provided with a guiding inclined surface and a clamping surface arranged at an angle. The guiding inclined surface can abut against the limiting column, and the clamping surface is located on the side of the limiting column away from the first end of the cantilever after the clamping is completed.

[0015] The above structure describes the specific construction and interaction of the first clamping member and the second clamping member. The first clamping member is configured as a first buckle, and the second clamping member is configured as a limiting column. This configuration enables the first buckle to be firmly connected to one side of the limiting column, forming a reliable and stable connection.

[0016] The first buckle includes a cantilever and a clamping portion connected to each other. The first end of the cantilever is tightly connected to the inner wall of the accommodating cavity, and the second end of the cantilever is a free end, so that the cantilever has a certain elasticity. When the cantilever is subjected to an external force, it can bend freely within a certain range, thereby enhancing the adaptability and flexibility of the first buckle.

[0017] The clamping part is located at the second end of the cantilever, and is provided with a guide slope and a clamping surface set at an angle. The guide slope can abut against the limit column during the clamping process, playing a guiding and positioning role. When the buckle approaches the limit column, the guide slope will first contact the limit column. As the first buckle continues to move, the guide slope will push the buckle to gradually approach the limit column until the clamping surface is attached to the side of the limit column away from the first end of the cantilever.

[0018] In some examples, the limiting column is a combination structure of a prism and a semi-cylinder, the prism and the semi-cylinder are integrally arranged, the prism is engaged with the first buckle, and the semi-cylinder is arranged on a side of the prism away from the cantilever;

[0019] The shell is provided with heat dissipation holes, part of the current limiting circuit breaker module and the inner wall of the shell form an arc extinguishing heat dissipation channel, the arc extinguishing heat dissipation channel is connected to the heat dissipation holes, and the outer peripheral surface of the semi-cylinder is part of the channel wall forming the arc extinguishing heat dissipation channel.

[0020] The above-mentioned limiting column of the present application adopts a combination structure of a prism and a semi-cylinder, which not only improves the overall strength of the limiting column, but also makes the connection between the limiting column and the current limiting circuit breaker module more stable, and can improve the connection stability between the current limiting circuit breaker module and the housing. The setting of the prism and the first buckle clamping enables the limiting column to be firmly assembled to the housing, thereby preventing the current limiting circuit breaker module from loosening.

[0021] The semi-cylinder is arranged on the side of the prism away from the cantilever. This arrangement not only reduces the overall volume of the limit column, but also enables the limit column to better limit the shape of the arc extinguishing heat dissipation channel, improves the smoothness of the fluid flow in the arc extinguishing heat dissipation channel, reduces fluid turbulence, and improves the heat dissipation efficiency of the arc extinguishing heat dissipation channel.

[0022] In some examples, a limiting plate is further provided on the current limiting circuit breaker module, and the limiting plate is spaced apart from the limiting column;

[0023] When the first buckle is engaged with the limiting column, part of the cantilever is located between the limiting plate and the limiting column.

[0024] The limiting plate can further limit the first buckle, and the cooperation of the limiting plate can make the clamping of the first buckle and the limiting column more stable and reliable. The spacing between the limiting plate and the limiting column can form a certain limiting cavity, and the limiting cavity can limit the cantilever. The limiting plate can improve the clamping stability of the first buckle, and further provide the anti-disassembly performance of the first buckle.

[0025] The limit plate can also provide a certain buffering and supporting effect to the current limiting device when it is impacted by external force, reducing the possibility of deformation and damage of the cantilever, thereby protecting the first buckle. When the first buckle is engaged with the limit column, part of the cantilever is between the limit plate and the limit column, further enhancing the stability and safety of the connection between the housing and the current limiting circuit breaker module.

[0026] In some examples, a plurality of first limiting members are disposed on the inner wall of the accommodating cavity, and a second limiting member matched with the first limiting member is disposed on the current limiting circuit breaker module.

[0027] A plurality of first limiting members are arranged on the inner wall of the accommodating cavity. The first limiting members may be in the form of protrusions, grooves or other shapes, and may accurately limit and position the current limiting circuit breaker module. The cooperation of the first limiting member and the second limiting member may make the connection between the current limiting circuit breaker module and the housing more stable and reliable.

[0028] In some examples, the first limiting member is slidably connected to the second limiting member, one of the first limiting member and the second limiting member is a slide groove structure, and the other of the first limiting member and the second limiting member is a slide rail structure, and the slide rail structure can slide along the slide groove structure;

[0029] After the first clamping member is clamped with the second clamping member, the relative positions of the slide rail structure and the slide slot structure are locked.

[0030] The cooperation of the first limiter and the second limiter can limit the relative motion range of the current limiting circuit breaker module and the housing. The activity mode of the first limiter and the second limiter can be set as needed. After the first clamping member is clamped with the second clamping member, the current limiting circuit breaker module and the housing will not be able to move relative to each other, and the relative position of the slide rail structure and the slide groove structure will also be locked.

[0031] In some examples, the first limiting member is slidably connected to the second limiting member, the first limiting member is a slide groove structure, and the second limiting member is a slide rail structure;

[0032] A third clamping member is disposed on the outer side of the slide rail structure, a fourth clamping member is disposed on the inner wall of the slide groove structure, and the third clamping member can be clamped to the fourth clamping member.

[0033] The first stopper and the second stopper can be connected by sliding to achieve mutual cooperation and restraint. The first stopper can adopt a slide groove structure, which can have a certain degree of openness and flexibility and can adapt to different motion trajectories of the second stopper. The second stopper is set as a matching slide rail structure, which has a certain degree of rigidity and stability and can ensure smooth and accurate sliding inside the first stopper.

[0034] In some examples, one of the third and fourth clips is configured as a second clip, and the other of the third and fourth clips is configured as a slot structure, and the second clip can be clipped into the slot structure.

[0035] The combination of the second buckle and the slot structure can achieve relative snap-fitting more easily and stably, thereby improving the stability of the assembly of the current limiting circuit breaker module and the housing. The second buckle is usually an elastic structure, and the elasticity does not have to be very strong, as long as it can be deformed under the action of an external force and can be snapped into the slot structure. The slot structure can provide sufficient matching space for the second buckle, and the shape and size of the slot structure can be larger than the size of the second buckle, or the size of the slot structure can be set to be almost the same as the size of the second buckle. The wall surface in the slot structure that plays a snap-fitting role is the snap-fitting wall surface, and the setting position of the snap-fitting avoidance can be set more accurately as needed to form a tight snap-fitting fit with the second buckle.

[0036] In a second aspect, the present application provides a motor protection assembly, including a motor protection device and the above-mentioned current limiting device, wherein the current limiting device is connected in series on one side of the motor protection device.

[0037] Based on the above-mentioned embodiments of the present application, the current limiting device simplifies the installation and maintenance process of the current limiting device through integrated setting, modular assembly and clamping fixation, thereby reducing the use cost and maintenance cost. When the current limiting device fails, the fault can be quickly eliminated by replacing a new current limiting device. In addition, the current limiting device can also improve the ultimate breaking capacity of the motor protection device, thereby improving the performance of the motor protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the examples or prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of a three-dimensional structure of a current limiting device in an example of the present application;

[0040] Figure 2 For this application, an example Figure 1 A local enlarged schematic diagram of the middle A;

[0041] Figure 3 For this application, an example Figure 1 Schematic diagram of the explosion of the structure of the medium current limiting device;

[0042] Figure 4 A schematic diagram of a top view of a current limiting device in an example of the present application;

[0043] Figure 5 For this application, an example Figure 4 Schematic diagram of the cross section in the AA direction;

[0044] Figure 6 For this application, an example Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0045] Figure 7 For this application, an example Figure 4 Schematic diagram of the cross section in the BB direction;

[0046] Figure 8 For this application, an example Figure 7 A partial enlarged schematic diagram of point C in the middle;

[0047] Fig. 9 It is another three-dimensional structural schematic diagram of a current limiting device in an example of the present application;

[0048] Fig.10 For this application, an example Fig. 9 Schematic diagram of the structural explosion of the medium current limiting device.

[0049] Reference numerals:

[0050] 100, shell; 110, accommodating cavity; 120, first clamping member; 121, cantilever; 122, clamping portion; 1221, guide slope; 1222, clamping surface; 130, first limit member; 140, third clamping member; 150, heat dissipation hole; 160, wiring hole; 200, current limiting circuit breaker module; 210, second clamping member; 211, prism; 212, semi-cylinder; 220, second limit member; 230, fourth clamping member; 240, limit plate. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present application.

[0052] In the relevant technical field, the motor protection device is also called the motor protector. Its function is to provide comprehensive protection for the motor. It is a device that alarms or protects the motor when it encounters overtime starting, overcurrent, undercurrent, phase failure, stall, short circuit, overvoltage, undervoltage, leakage (grounding), three-phase imbalance, overheating, bearing wear, stator and rotor eccentricity, external fault, power supply self-start, or inverse time limit.

[0053] Existing motor protection devices such as motor thermal magnetic circuit breakers are often used at a working voltage of 400 / 415V. The specifications above the rated current of 14A cannot be consistent with the following specifications to achieve the ultimate breaking capacity of 100KA. The reason is that the impedance of the thermal magnetic tripping has different suppression capabilities for short-circuit current. As the rated current increases, the design impedance decreases, and the corresponding short-circuit current suppression capability will also weaken. Motor protection devices usually have additional current limiting devices to increase the ultimate breaking capacity.

[0054] However, the shell of the current limiting device usually includes a shell, an upper cover and other structures. The structure is complex and difficult to assemble, and the production cost is high. Taking the three-phase current limiting device as an example, the three-phase current limiting device is assembled together by the yin and yang matching of the shell, and the upper cover is covered and riveted together. This fixing method requires at least two rivets and an upper cover, which will add an extra riveting fixture and increase the riveting time. After the riveting is completed, there is a gap on the front of the product, which is not beautiful, and increases the difficulty of pad printing or laser on the front.

[0055] Therefore, the current limiting device in the prior art will have a large number of gaps, and there are also fixings such as rivets, which will greatly increase the difficulty of pad printing or laser on the front of the current limiting device, and increase the cost, design cost and processing cost of the current limiting device. Among them, pad printing is an indirect printing technology that uses a silicone print head to transfer ink from the printing plate to the surface of the product. Laser technology uses a high-energy laser beam to write or ablate a mark on the surface of the product. Laser marking has extremely high precision and resolution, can print very delicate images and text, and prints very quickly.

[0056] To solve the above technical problems, please refer to Figure 1-Figure 10 As shown, the first aspect of the present application proposes a current limiting device, which can improve the robustness of the current limiting device, make it less likely for the shell 100 to explode, and make the installation and maintenance of the current limiting device more convenient, thereby reducing the cost of the current limiting device.

[0057] Reference Figures 1 to 3In some examples, the current limiting device is connected in series at one end of the motor protection device, and the current limiting device includes a shell 100 and a plurality of current limiting circuit breaker modules 200. The shell 100 is an integrated structure, and the shell 100 has a accommodating cavity 110, and a plurality of first clips 120 are arranged in the accommodating cavity 110; a plurality of current limiting circuit breaker modules 200 are installed in the accommodating cavity 110 at the same time, and a second clip 210 is arranged on the current limiting circuit breaker module 200, and the first clip 120 and the second clip 210 can be clipped to each other; the number of the current limiting circuit breaker modules 200 and the first clip 120 is the same, and each first clip 120 can be clipped to the corresponding second clip 210 respectively.

[0058] Based on the above-mentioned embodiments of the present application, the current limiting device can improve the ultimate breaking capacity of the motor protection device, thereby improving the performance of the motor protection device. The housing 100 can accommodate and install multiple current limiting circuit breaker modules 200. The integrated housing 100 can reduce the gap of the entire current limiting device, improve the firmness of the current limiting device, increase the aesthetics of the current limiting device, and make the installation and maintenance of the current limiting device more convenient, and can reduce the difficulty of pad printing and laser marking.

[0059] The shell 100 of the present application may be provided with only one, and a single shell 100 may be equipped with multiple current limiting circuit breaker modules 200 through the accommodating cavity 110 . Two or more shells 100 may also be provided as needed, and at least two current limiting circuit breaker modules 200 may be installed in each shell 100 .

[0060] The first clamping member 120 in the accommodating cavity 110 and the second clamping member 210 on the current limiting circuit breaker module 200 can be mutually clamped to realize the assembly of the housing 100 and the current limiting circuit breaker module 200. Multiple current limiting circuit breaker modules 200 can be spliced ​​with each other and installed in the accommodating cavity 110 at the same time, or multiple current limiting circuit breaker modules 200 can be independently installed in the accommodating cavity 110. The number of current limiting circuit breaker modules 200 is positively correlated with the model and phase number of the motor protection device. For example, if the motor protection device is installed in a three-phase circuit, the number of current limiting circuit breaker modules 200 is set to three.

[0061] The integrated shell 100 in the present application can improve the robustness of the current limiting device, making it less likely for the shell 100 to explode, and makes the installation and maintenance of the current limiting device more convenient, thereby reducing the cost of the current limiting device.

[0062] The current limiting device of the present application can be a modular structure, and thus has good versatility and scalability. By adjusting the number and type of current limiting circuit breaker modules 200, it can adapt to motor protection devices of different models and specifications to meet different usage requirements. At the same time, since the current limiting device adopts a modular setting, the function and performance of the current limiting device can be easily expanded, such as increasing the breaking capacity, improving the current limiting capacity, and improving the circuit breaking speed, so as to meet the needs of continuous upgrading and changes.

[0063] The current limiting device of the present application improves the ultimate breaking capacity and performance of the motor protection device through integrated setting, modular assembly and clip-on fixation, while simplifying the installation and maintenance process and reducing the use cost and maintenance cost.

[0064] The number of the second clamping parts 210 is an integer multiple of the number of the current limiting circuit breaker modules 200. Each current limiting circuit breaker module 200 is provided with one, two or three second clamping parts 210, and the number of the corresponding first clamping parts 120 can be proportional to the current limiting circuit breaker modules 200. The number of the first clamping parts 120 can be the same as the number of the current limiting circuit breaker modules 200, or can be set differently as needed. For example, the ratio of the number of the first clamping parts 120 to the number of the current limiting circuit breaker modules 200 can be 1:1, 1:2, 1:3, 3:1, 2:1, 1:1, 2:2, etc. When the ratio is 1:3, one first clamping part 120 can be adapted to be connected to three current limiting circuit breaker modules 200 at the same time. When the ratio is 3:1, three first clamping parts 120 are adapted to be connected to one current limiting circuit breaker module 200 together.

[0065] Specifically, the first clamping member 120 and the second clamping member 210 are arranged in groups, and the number of groups corresponds to the number of the current limiting circuit breaker modules 200. The second clamping member 210 of each group can be mutually clamped with the first clamping member 120 to form a tight fixed structure. For example, the number ratio of the first clamping member 120 to the second clamping member 210 of each group is 1:1. When the first clamping member 120 is set to two, the second clamping member 210 is also set to two; when the first clamping member 120 is set to three, the second clamping member 210 is also set to three. At this time, the number of the current limiting circuit breaker modules 200 and the first clamping member 120 is exactly the same, and each first clamping member 120 can be respectively clamped to the corresponding second clamping member 210. This arrangement can improve the stability and reliability of the current limiting device, and can make the current limiting circuit breaker module 200 more convenient to install or disassemble, thereby greatly reducing the cost of maintenance and replacement.

[0066] The number ratio of each group of first clips 120 to second clips 210 can also be 1:2. In this case, two second clips 210 can be simultaneously connected to one first clip 120. When the first clip 120 is set to two, the second clip 210 is set to four; when the first clip 120 is set to three, the second clip 210 is set to six.

[0067] The ratio of the number of first clamping components 120 to the second clamping components 210 in each group can also be 2:1. In this case, two first clamping components 120 can be simultaneously clamped to one second clamping component 210. When the first clamping components 120 are set to four, the second clamping components 210 are set to two; when the first clamping components 120 are set to six, the second clamping components 210 are set to three.

[0068] The housing 100 of the present application does not include a cover plate component, which can further reduce the number of parts of the current limiting device, improve the assembly efficiency of the current limiting device, and reduce production costs.

[0069] In some examples, at least one of the first clamping member 120 and the second clamping member 210 includes a one-way clamping barb structure, and the first clamping member 120 and the second clamping member 210 cooperate to form a one-way clamping anti-disassembly mechanism.

[0070] The one-way clip-on hook structure can form a strong, one-way clip-on force, thereby constructing an anti-disassembly mechanism. The anti-disassembly mechanism is one-way, that is, after the clip-on is completed, it is difficult to separate unless a specific unlocking operation is taken. The anti-disassembly mechanism can ensure the stability and safety of the current limiting device during use, and effectively prevent the current limiting device from being illegally opened during transportation. The hook structure also has a high degree of stability and reliability. The connection between the clips that are in place is firm and can withstand various external forces and vibrations, so that the current limiting device has a higher connection strength.

[0071] The barb structure is used to achieve a one-way, irreversible connection between two components. The barb structure of the present application is used to achieve the connection between the housing 100 and the current limiting circuit breaker module 200. This structure is usually used in application scenarios that require high safety and stability, such as anti-disassembly devices, locking mechanisms, etc. The barb structure in the present application can achieve anti-disassembly of the current limiting device.

[0072] The barb structure has a variety of shapes and generally includes one or more protruding hook-shaped portions that can bend or deform when snapped into a corresponding hole, groove or snap-in wall of another component, and then return to its original shape when released, thereby locking the two components.

[0073] Barb structure shapes include:

[0074] L-type barb: This barb has a straight portion that is inserted into the hole and a curved portion that bends and locks after insertion.

[0075] U-shaped barb: This barb is similar to a U-shaped staple, with one straight section and two curved ends that bend and lock after being inserted into the hole.

[0076] V-shaped barb: After insertion, the V-shaped barb produces plastic deformation in the material through its sharp V-shaped structure, thus forming a lock.

[0077] The present application does not impose any limitation on the shape of the barb structure, as long as the relative snap connection between the housing 100 and the current limiting circuit breaker module 200 can be achieved.

[0078] The material of the barb structure needs to have certain strength, hardness, toughness and corrosion resistance to withstand external forces and environmental changes during application. Common barb structure materials include:

[0079] Metal: such as steel, stainless steel, aluminum alloy, etc. These materials have high strength and hardness and are suitable for application scenarios requiring high safety and stability. The metal barb structure can be installed on the corresponding non-metallic housing 100 by two-color injection molding or the like, or can be integrally formed on the metal housing 100, or the barb structure can be connected by welding, bonding, bolting, etc.

[0080] Non-metallic materials, such as plastic materials such as nylon and polyester, can also be non-metallic materials such as ceramics. These materials are lighter and less expensive, and are suitable for some scenarios that have requirements on weight and cost. They can also be specially surface treated or reinforced as needed to improve their strength and corrosion resistance. When selecting the material of the barb structure, it is necessary to comprehensively consider the specific needs of the application scenario, including connection strength, use environment, cost and other factors.

[0081] Reference Figures 3 to 5 In some examples, the first clamping member 120 is a first buckle, the second clamping member 210 is a limiting column, and the first buckle can be clamped on one side of the limiting column;

[0082] Reference Figure 6 The first buckle includes a cantilever 121 and a clamping portion 122 connected to each other, the first end of the cantilever 121 is connected to the inner wall of the accommodating cavity 110, and the second end of the cantilever 121 is a free end;

[0083] The clamping portion 122 is arranged at the second end of the cantilever 121, and is provided with a guiding inclined surface 1221 and a clamping surface 1222 arranged at an angle. The guiding inclined surface 1221 can abut against the limiting column, and the clamping surface 1222 is located on the side of the limiting column away from the first end of the cantilever 121 after the clamping is completed.

[0084] The above structure describes the specific construction and interaction of the first clamping member 120 and the second clamping member 210. The first clamping member 120 is configured as a first buckle, and the second clamping member 210 is configured as a limiting column. This configuration allows the first buckle to be firmly clamped on one side of the limiting column, forming a reliable and stable connection.

[0085] The first buckle includes a connected cantilever 121 and a clamping portion 122. The first end of the cantilever 121 is tightly connected to the inner wall of the accommodating cavity 110, and the second end of the cantilever 121 is a free end, so that the cantilever 121 has a certain elasticity. When subjected to external force, the cantilever 121 can bend freely within a certain range, thereby enhancing the adaptability and flexibility of the first buckle.

[0086] The clamping portion 122 is located at the second end of the cantilever 121, and is provided with a guide slope 1221 and a clamping surface 1222 arranged at an angle. The guide slope 1221 can abut against the limit column during the clamping process, playing a role of guiding and positioning. When the buckle approaches the limit column, the guide slope 1221 will first contact the limit column. As the first buckle continues to move, the guide slope 1221 will push the buckle to gradually approach the limit column until the clamping surface 1222 is attached to the side of the limit column away from the first end of the cantilever 121.

[0087] After the clamping surface 1222 is clamped, the clamping surface 1222 will be located on the side of the limiting column away from the first end of the cantilever 121. This arrangement makes the connection between the first buckle and the limiting column more firm and stable, and is not easily disturbed by external forces. Since the fitting area between the clamping surface 1222 and the limiting column is large, it can also withstand greater tension and pressure, thereby improving the strength and reliability of the connection.

[0088] The clamping portion 122 can be set as a hook structure, and the angled guide slope 1221 and the clamping surface 1222 are set on the hook structure. After the clamping is completed, the entire hook structure can be located on the side of the limiting column away from the first end of the cantilever 121.

[0089] The arrangement of the clamping portion 122 and the limiting column being clamped to each other not only simplifies the assembly process, but also improves the stability and reliability of the structure. The combination of the clamping portion 122 and the limiting column can be further analyzed.

[0090] The clamping portion 122 can be configured as a barb structure, having an angled guide slope 1221 and a clamping surface 1222. The limiting column is a column fixed at a specific position, used to limit the current limiting circuit breaker module 200. Before assembly, the current limiting circuit breaker module 200 can move within a certain range, and after assembly, the current limiting circuit breaker module 200 can be locked by the cooperation of the clamping portion 122 and the limiting column.

[0091] When the clamping portion 122 is combined with the limiting column, the guiding bevel 1221 of the clamping portion 122 first contacts the limiting column. Since the guiding bevel 1221 is set at a certain angle, when the clamping portion 122 approaches the first side of the limiting column, the guiding bevel 1221 can smoothly guide the clamping portion 122 to slide into the peripheral side of the limiting column. At this time, the cantilever 121 will undergo elastic deformation, and the guiding bevel 1221 in the accompanying drawings can slide into the lower side of the limiting column. Once the clamping portion 122 is completely moved to the second side of the limiting column, the cantilever 121 will be reset under the action of the elastic force, and the clamping surface 1222 will be tightly fitted with the side of the limiting column away from the first end of the cantilever 121, thereby completing the clamping process.

[0092] This arrangement makes the connection between the clamping portion 122 and the limiting column simple and firm. The setting of the guide slope 1221 makes the clamping process easy, and the close fit between the clamping surface 1222 and the limiting column ensures the stability and reliability of the structure. In addition, since the clamping portion 122 adopts a barb structure, once the clamping is completed, it is difficult to be disassembled by external force, thereby effectively preventing accidental falling off or loosening.

[0093] Reference Figure 6 In some examples, the limiting column is a combination structure of a prism 211 and a semi-cylinder 212, the prism 211 and the semi-cylinder 212 are integrally arranged, the prism 211 is engaged with the first buckle, and the semi-cylinder 212 is arranged on a side of the prism 211 away from the cantilever 121;

[0094] The shell 100 is provided with heat dissipation holes 150 , and part of the current limiting circuit breaker module 200 and the inner wall of the shell 100 form an arc extinguishing heat dissipation channel, which is connected to the heat dissipation holes 150 , and the outer peripheral surface of the semi-cylinder 212 is part of the channel wall forming the arc extinguishing heat dissipation channel.

[0095] The above-mentioned limiting column of the present application adopts a combination structure of a prism 211 and a semi-circular column 212. This combination structure not only improves the overall strength of the limiting column, but also makes the connection between the limiting column and the current limiting circuit breaker module 200 more stable, and can improve the connection stability between the current limiting circuit breaker module 200 and the housing 100. The setting of the prism 211 and the first buckle snap connection enables the limiting column to be firmly assembled to the housing 100, thereby preventing the current limiting circuit breaker module 200 from loosening.

[0096] The semi-cylinder 212 is arranged on the side of the prism 211 away from the cantilever 121. This arrangement not only reduces the overall volume of the limit column, but also enables the limit column to better define the shape of the arc extinguishing heat dissipation channel, thereby improving the smoothness of the fluid flow in the arc extinguishing heat dissipation channel, reducing fluid turbulence, and improving the heat dissipation efficiency of the arc extinguishing heat dissipation channel.

[0097] An arc extinguishing chamber is provided on the current limiting circuit breaker module 200. The current limiting circuit breaker module 200 can cooperate with the housing 100 to form the above-mentioned arc extinguishing heat dissipation channel. The housing 100 is provided with heat dissipation holes 150 connected to the arc extinguishing heat dissipation channel. These heat dissipation holes 150 can effectively discharge the heat in the housing 100 to prevent the current limiting device from being damaged due to overheating. Most of the heat in the current limiting device is generated by the arc extinguishing chamber during the arc extinguishing process. The heat dissipation efficiency of the current limiting device can be improved by the arc extinguishing heat dissipation channel. The arc extinguishing heat dissipation channel is connected to the heat dissipation holes 150, so that the heat can be discharged faster. The outer peripheral surface of the semi-cylinder 212 can form an arc-shaped channel wall inside the arc extinguishing heat dissipation channel, which can further improve the heat dissipation effect of the arc extinguishing heat dissipation channel.

[0098] A wiring hole 160 is further provided on one side of the heat dissipation hole 150 . The number of the wiring holes 160 can be the same as the number of the heat dissipation holes 150 . A wiring terminal is provided at a position corresponding to the wiring hole 160 in the accommodating cavity 110 . The wiring terminal can be connected to an external wire.

[0099] Reference Figure 5 and Figure 6 In some examples, a limiting plate 240 is further provided on the current limiting circuit breaker module 200, and the limiting plate 240 is spaced apart from the limiting column;

[0100] When the first buckle is engaged with the limiting column, part of the cantilever 121 is located between the limiting plate 240 and the limiting column.

[0101] The limiting plate 240 can further limit the first buckle, and the cooperation of the limiting plate 240 can make the clamping of the first buckle and the limiting column more stable and reliable. The spacing between the limiting plate 240 and the limiting column can form a certain limiting cavity, and the limiting cavity can limit the cantilever 121. The limiting plate 240 can improve the clamping stability of the first buckle and further provide the anti-disassembly performance of the first buckle.

[0102] The limiting plate 240 can also provide a certain buffering and supporting effect to the current limiting device when it is impacted by external force, reducing the possibility of deformation and damage of the cantilever 121, thereby protecting the first buckle. When the first buckle is engaged with the limiting column, part of the cantilever 121 is between the limiting plate 240 and the limiting column, further enhancing the stability and safety of the connection between the housing 100 and the current limiting circuit breaker module 200.

[0103] In practical applications, the setting of the limiting plate 240 and the limiting column also needs to take into account factors such as material strength, wear resistance, and corrosion resistance. The selection of these factors will affect the service life and safety of the current limiting circuit breaker module 200. Therefore, when setting and manufacturing the current limiting circuit breaker module 200, it is necessary to comprehensively consider various factors to ensure that the entire current limiting device can operate stably in various harsh environments and provide reliable safety protection for users.

[0104] In some examples, a plurality of first stoppers 130 are disposed on the inner wall of the accommodating cavity 110, and a second stopper 220 adapted to the first stopper 130 is disposed on the current limiting circuit breaker module 200, for details, see Figure 3 .

[0105] A plurality of first stoppers 130 are provided on the inner wall of the accommodating cavity 110. The first stoppers 130 may be in the form of protrusions, grooves or other shapes, and may accurately stop and position the current limiting circuit breaker module 200. The cooperation between the first stoppers 130 and the second stoppers 220 may make the connection between the current limiting circuit breaker module 200 and the housing 100 more stable and reliable.

[0106] When the current limiting circuit breaker module 200 is installed in the accommodating cavity 110, the second limit member 220 will cooperate with the first limit member 130 to form a stable connection mechanism, which can realize relative sliding, relative rotation or a combination of multiple activities between the current limiting circuit breaker module 200 and the shell 100.

[0107] Reference Figure 3 In some examples, the first stopper 130 is slidably connected to the second stopper 220, one of the first stopper 130 and the second stopper 220 is a slide groove structure, and the other of the first stopper 130 and the second stopper 220 is a slide rail structure, and the slide rail structure can slide along the slide groove structure;

[0108] After the first clamping member 120 is clamped with the second clamping member 210 , the relative positions of the slide rail structure and the slide slot structure are locked.

[0109] The limiter (the first limiter 130 and the second limiter 220) can be a structural member used to limit the range of motion of a mechanical moving part, and the limiter can effectively prevent the mechanical part from excessive displacement or deviating from a preset track during the movement. The cooperation of the first limiter 130 and the second limiter 220 can limit the relative motion range of the current limiting circuit breaker module 200 and the housing 100. The activity mode of the first limiter 130 and the second limiter 220 can be set as needed. After the first clamping member 120 is clamped with the second clamping member 210, the current limiting circuit breaker module 200 and the housing 100 will not be able to move relative to each other, and the relative position of the slide rail structure and the slide groove structure will also be locked.

[0110] The first stopper 130 and the second stopper 220 can be connected in a sliding manner. One of the first stopper 130 and the second stopper 220 can be configured as a slide groove structure, and the other of the first stopper 130 and the second stopper 220 can be configured as a slide rail structure. The slide rail structure can slide along the slide groove structure, and this configuration allows the two stoppers to have a certain degree of freedom and to be accurately positioned within a certain range.

[0111] Among them, the first limiter 130 can be a slide groove structure provided on the inner side of the housing 100, and correspondingly, the second limiter 220 can be a slide rail structure provided on the current limiting circuit breaker module 200, and each current limiting circuit breaker module 200 is provided with at least one slide rail structure, and the number of the slide rail structure and the slide groove structure are adapted. Alternatively, the second limiter 220 can be a slide groove structure provided on the inner side of the housing 100, and correspondingly, the first limiter 130 can be a slide rail structure provided on the current limiting circuit breaker module 200, and each current limiting circuit breaker module 200 is provided with at least one slide rail structure, and the number of the slide rail structure and the slide groove structure are adapted.

[0112] In some examples, the first stopper 130 is slidably connected to the second stopper 220, the first stopper 130 is a slide groove structure, and the second stopper 220 is a slide rail structure;

[0113] A third clamping member 140 is disposed on the outer side of the slide rail structure, and a fourth clamping member 230 is disposed on the inner wall of the slide groove structure. The third clamping member 140 can be clamped to the fourth clamping member 230 .

[0114] The first stopper 130 and the second stopper 220 can be connected by sliding to achieve mutual cooperation and constraint. The first stopper 130 can adopt a slide groove structure, which can have a certain degree of openness and flexibility, and can adapt to different movement trajectories of the second stopper 220. The second stopper 220 is set as a matching slide rail structure, which has a certain degree of rigidity and stability, and can ensure smooth and accurate sliding inside the first stopper 130.

[0115] In order to make the slide rail structure slide stably inside the slide groove structure, and to further lock the relative position of the current limiting circuit breaker module 200 and the housing 100, a third clamping member 140 is arranged on the outer side of the slide rail structure, and a fourth clamping member 230 adapted to the third clamping member 140 is arranged on the inner wall of the slide groove structure. The two clamping members can be made of at least part of elastic material or can be clamped by utilizing a certain elastic deformation range of the material itself, so that at least one of the third clamping member 140 and the fourth clamping member 230 has certain toughness and elasticity. When the slide rail structure slides inside the slide groove structure, the third clamping member 140 can be automatically clamped to the fourth clamping member 230, thereby achieving the purpose of position limiting clamping.

[0116] The first clamping member 120 and the second clamping member 210 mentioned above can cooperate to form a first clamping assembly, and the third clamping member 140 and the fourth clamping member 230 can cooperate to form a second clamping assembly. The second clamping assembly is a supplement to the first clamping assembly. The two sets of clamping assemblies can make the relative clamping of the current limiting circuit breaker module 200 and the housing 100 have higher stability. More clamping assemblies can also be set at other positions of the current limiting circuit breaker module 200 and the housing 100 as needed, for example, a fifth clamping member is set on the inner wall of the accommodating cavity 110 in the housing 100 close to the opening, and a sixth clamping member is set on the corresponding limit circuit breaker module. The fifth clamping member and the sixth clamping member can cooperate to form a third clamping assembly, which can further improve the stability of the current limiting circuit breaker module 200 and the housing 100.

[0117] At least one of the second clamping assembly and the third clamping structure can also be set as a one-way clamping structure, that is, at least one of the second clamping assembly and the third clamping structure includes a one-way clamping barb structure. The above-mentioned clamping assembly not only has a limiting function, but also can withstand certain impacts and vibrations. When the current limiting device is subject to external interference or impact, the joint action of multiple clamping assemblies can ensure that the position and state of the current limiting device are not easily affected, ensure that the slide rail structure will not separate from the slide groove structure, thereby ensuring the stability and reliability of the current limiting device.

[0118] Reference Figure 7 and Figure 8 In some examples, one of the third clip 140 and the fourth clip 230 is configured as a second clip, and the other of the third clip 140 and the fourth clip 230 is configured as a slot structure, and the second clip can be snapped into the slot structure.

[0119] The combination of the second buckle and the slot structure can achieve relative snap-fitting more easily and stably, thereby improving the stability of the assembly of the current limiting circuit breaker module 200 and the housing 100. The second buckle is usually an elastic structure, and the elasticity is not necessarily very strong, as long as it is deformed under the action of an external force and can be snapped into the slot structure. The slot structure can provide sufficient matching space for the second buckle, and the shape and size of the slot structure can be larger than the size of the second buckle, or the size of the slot structure and the size of the second buckle can be set to be almost the same. The wall surface in the slot structure that plays a snap-fitting role is the snap-fitting wall surface, and the setting position of the snap-fitting avoidance can be set more accurately as needed to form a tight snap-fitting fit with the second buckle.

[0120] The third clamping member 140 can be configured as a second buckle, and the corresponding fourth clamping member 230 can be configured as a slot structure. Fig.10 The fourth clamping member 230 can also be configured as a second clamping member as required, and the corresponding third clamping member 140 can be configured as a clamping slot structure.

[0121] For example, refer to the attached Fig. 9 and Fig.10 The third clamping member 140 is a second clamping buckle, and the fourth clamping member 230 is a clamping slot structure, and the second clamping buckle can be clamped into the clamping slot structure. At least one of the third clamping member 140 and the fourth clamping member 230 includes a one-way clamping barb structure, and the third clamping member 140 and the fourth clamping member 230 can also cooperate to form a one-way clamping anti-disassembly mechanism.

[0122] In a second aspect, the present application provides a motor protection assembly, including a motor protection device and the above-mentioned current limiting device, wherein the current limiting device is connected in series to one side of the motor protection device.

[0123] Based on the above-mentioned embodiments of the present application, the current limiting device simplifies the installation and maintenance process of the current limiting device through integrated setting, modular assembly and clamping fixation, thereby reducing the use cost and maintenance cost. When the current limiting device fails, the fault can be quickly eliminated by replacing a new current limiting device. In addition, the current limiting device can also improve the ultimate breaking capacity of the motor protection device, thereby improving the performance of the motor protection device.

[0124] Specifically, the housing 100 in the current limiting device can accommodate and install multiple current limiting circuit breaker modules 200. The integrated housing 100 can reduce the gap of the entire current limiting device, improve the firmness of the current limiting device, increase the aesthetics of the current limiting device, and make the installation and maintenance of the current limiting device more convenient, and can reduce the difficulty of proof pad printing and laser marking. The housing 100 of the present application can be set only one, and a single housing 100 can be equipped with multiple current limiting circuit breaker modules 200 through the accommodating cavity 110. Two or more housings 100 can also be set as needed, and at least two current limiting circuit breaker modules 200 can be assembled in each housing 100.

[0125] The first clamping member 120 in the accommodating cavity 110 and the second clamping member 210 on the current limiting circuit breaker module 200 can be mutually clamped to realize the assembly of the housing 100 and the current limiting circuit breaker module 200. Multiple current limiting circuit breaker modules 200 can be spliced ​​with each other and installed in the accommodating cavity 110 at the same time, or multiple current limiting circuit breaker modules 200 can be independently installed in the accommodating cavity 110. The number of current limiting circuit breaker modules 200 is positively correlated with the model and phase number of the motor protection device. For example, if the motor protection device is installed in a three-phase circuit, the number of current limiting circuit breaker modules 200 is set to three.

[0126] The integrated housing 100 in the present application can improve the robustness of the current limiting device, and make the installation and maintenance of the current limiting device more convenient, thereby reducing the cost of the current limiting device.

[0127] The same or similar numbers in the drawings of this application correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0128] The above are only preferred examples of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A current limiting device, characterized in that: Connected in series at one end of the motor protection device, the current limiting device comprises: The housing is an integrated structure, the housing has a receiving cavity, and a plurality of first clamping members are arranged in the receiving cavity; A plurality of current limiting circuit breaker modules are installed in the accommodating cavity at the same time, and a second clamping piece is provided on the current limiting circuit breaker module, and the first clamping piece and the second clamping piece can be clamped with each other; The number of the current-limiting circuit breaker modules is the same as the number of the first clamping components, and each of the first clamping components can be respectively clamped to the corresponding second clamping component.

2. The current limiting device according to claim 1, characterized in that: At least one of the first clamping member and the second clamping member comprises a one-way clamping barb structure, and the first clamping member and the second clamping member cooperate to form a one-way clamping anti-disassembly mechanism.

3. The current limiting device according to claim 1 or 2, characterized in that: The first clamping member is a first buckle, the second clamping member is a limiting column, and the first buckle can be clamped on one side of the limiting column; The first buckle comprises a cantilever and a clamping portion connected to each other, the first end of the cantilever is connected to the inner wall of the accommodating cavity, and the second end of the cantilever is a free end; The clamping portion is arranged at the second end of the cantilever, and is provided with a guiding inclined surface and a clamping surface arranged at an angle. The guiding inclined surface can abut against the limiting column, and the clamping surface is located on the side of the limiting column away from the first end of the cantilever after the clamping is completed.

4. The current limiting device according to claim 3, characterized in that: The limiting column is a combination structure of a prism and a semi-cylinder, the prism and the semi-cylinder are integrally arranged, the prism is engaged with the first buckle, and the semi-cylinder is arranged on a side of the prism away from the cantilever; The shell is provided with heat dissipation holes, part of the current limiting circuit breaker module and the inner wall of the shell form an arc extinguishing heat dissipation channel, the arc extinguishing heat dissipation channel is connected to the heat dissipation holes, and the outer peripheral surface of the semi-cylinder is part of the channel wall forming the arc extinguishing heat dissipation channel.

5. The current limiting device according to claim 3, characterized in that: The current limiting circuit breaker module is also provided with a limit plate, and the limit plate is spaced apart from the limit column; When the first buckle is engaged with the limiting column, part of the cantilever is located between the limiting plate and the limiting column.

6. The current limiting device according to claim 1, characterized in that: A plurality of first limiting members are arranged on the inner wall of the accommodating cavity, and a second limiting member matched with the first limiting member is arranged on the current limiting circuit breaker module.

7. The current limiting device according to claim 6, characterized in that: The first limiting member is slidably connected to the second limiting member, one of the first limiting member and the second limiting member is a slide groove structure, and the other of the first limiting member and the second limiting member is a slide rail structure, and the slide rail structure can slide along the slide groove structure; After the first clamping member is clamped with the second clamping member, the relative positions of the slide rail structure and the slide slot structure are locked.

8. The current limiting device according to claim 6, characterized in that: The first limiting member is slidably connected to the second limiting member, the first limiting member is a slide groove structure, and the second limiting member is a slide rail structure; A third clamping member is disposed on the outer side of the slide rail structure, a fourth clamping member is disposed on the inner wall of the slide groove structure, and the third clamping member can be clamped to the fourth clamping member.

9. The current limiting device according to claim 8, characterized in that: One of the third clamping member and the fourth clamping member is configured as a second clamp, and the other of the third clamping member and the fourth clamping member is configured as a clamping slot structure, and the second clamp can be clamped into the clamping slot structure.

10. A horse protection component, characterized in that: include: Motor protection devices; and, The current limiting device according to any one of claims 1 to 9, wherein the current limiting device is connected in series on one side of the motor protection device.

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