A motor protection device

Abstract

The utility model discloses a motor protection device, including first casing, second casing, copper strip copper sheet subassembly, mutual inductor, function board, communication board, function wiring terminal and communication wiring terminal, copper strip copper sheet subassembly is three groups, and copper strip copper sheet subassembly includes copper sheet and copper strip, three mutual inductors are respectively worn into three groups of copper strip copper sheet subassembly, and the copper strip copper sheet subassembly of installing good mutual inductor is placed into first casing from the front side, and the copper sheet is fixed in the copper sheet groove through copper sheet fixed buckle, and the both sides wall of first casing is provided with at least two groups of circuit board groove, and function board and communication board are inserted into circuit board groove respectively, and the copper sheet is provided with voltage signal end, and mutual inductor and voltage signal end all are connected with function board electricity, and be provided with function port on function board, and function terminal connects function port, and be provided with communication port on communication board, and communication terminal connects communication port, and the front wall of second casing is provided with incoming line end hole, and when second casing installs to first casing, copper strip is worn from incoming line end hole.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a motor protection device. Background Technology

[0002] In high-power motor operating circuits, contactors are commonly used to control the switching on and off of the motor. To prevent overload damage, a thermal relay is usually installed at the lower end of the contactor for overload protection. However, traditional thermal relays only provide single overload protection and cannot measure electrical parameters such as current and voltage in the circuit. Obtaining these electrical parameters requires additional specialized measuring equipment, which not only increases the overall size of the circuit system, occupying more installation space, but also increases equipment cost and circuit complexity. Furthermore, the additional measuring equipment requires separate wiring and installation, extending the construction period, reducing construction efficiency, and potentially causing compatibility issues between multiple devices, affecting the stability and reliability of the circuit system. Summary of the Invention

[0003] This utility model addresses the problems and shortcomings of existing technologies by providing a novel motor protection device.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution: This utility model provides a motor protection device, including a first housing, a second housing, a copper strip and copper sheet assembly, a current transformer, a function board, a communication board, a function terminal block, and a communication terminal block; The copper strip and copper sheet assembly consists of three sets arranged sequentially. Each set of the copper strip and copper sheet assembly includes a copper sheet and a copper strip. The copper strip is arranged in a U-shape. One end of the copper strip is connected to the copper sheet, and the other end is bent outward to form the inlet end. There are three current transformers. The three current transformers are respectively inserted into the copper strips of the three sets of copper strip and copper sheet assemblies. They are arranged vertically in a staggered manner and in a triangular arrangement. The first housing contains three copper strip slots arranged side by side corresponding to the three sets of copper strip and copper sheet assemblies. Copper sheet fixing buckles are provided in the copper sheet slots. The three sets of copper strip and copper sheet assemblies with the current transformer installed are placed into the first housing. The copper sheets are fixed in the copper sheet slots by the copper sheet fixing buckles. The inlet end extends out of the first housing. The first housing has at least two sets of circuit board slots on both sides. The functional board and the communication board are respectively inserted into the first housing through the circuit board slots, such that the lower parts of the functional board and the communication board are located in the middle of the copper strip. The copper sheet is provided with a voltage signal terminal, and both the current transformer and the voltage signal terminal are electrically connected to the functional board to collect current signals and voltage signals. The function board is provided with function ports, and the function terminals are connected to the function ports; The communication board is provided with a communication port, and the communication terminal is connected to the communication port; The front wall of the second housing is provided with inlet holes corresponding to the copper strip and copper sheet assembly. There are three inlet holes. When the second housing is installed on the first housing, the inlet ends of the copper strips of the three sets of copper strip and copper sheet assemblies pass through the inlet holes to connect to the contactor.

[0005] Preferably, a copper strip wiring groove is provided on the outer side of the first housing corresponding to the copper strip groove, and a wiring screw is provided in the copper strip wiring groove. The wiring screw is screwed in to connect the copper strip and is used to connect an external cable.

[0006] Preferably, the function board is located near and facing the front wall of the first housing, and a function terminal slot is provided through the upper part of the front wall of the second housing, through which the function terminal is inserted and connected to the function port.

[0007] Preferably, the communication board is disposed near and facing the rear wall of the first housing, and a communication terminal slot is provided through the upper part of the rear wall of the first housing, through which the communication terminal is inserted and connected to the communication port.

[0008] Preferably, it further includes a support plate. A support plate groove and a limiting buckle are provided on the outer side of the front wall of the first housing. The support plate is inserted into the support plate groove and its vertical position is limited by the limiting buckle. The lower part of the support plate is located behind the inlet end of the copper strip of the copper strip assembly to support the inlet end.

[0009] Preferably, the second housing covers the first housing from the front and top; the upper part of the two side walls of the first housing is provided with a rear buckle near the rear wall, the lower part of the two side walls of the first housing is provided with a front buckle near the front wall, the upper part of the two side walls of the second housing is provided with a rear buckle groove matching the rear buckle, the lower part of the two side walls of the second housing is provided with a front buckle groove matching the front buckle, and the first housing and the second housing are connected by the front buckle and the front buckle groove and the rear buckle and the rear buckle groove.

[0010] Preferably, the lower parts of both sides of the first housing are provided with inner sidewalls and outer sidewalls and form a middle groove, and the lower parts of both sides of the second housing are provided with embedding walls. When the first housing and the second housing are fastened together, the embedding walls of the second housing are embedded in the middle groove of the first housing.

[0011] Preferably, the second and third inlet holes of the second housing are connected by an adjustment groove and an adjustment hole to adjust the position of the copper strip inserted into the inlet hole to match contactors with different wiring spacing.

[0012] Preferably, the current transformer is inserted into one side of the copper strip connecting the copper sheet, and the three current transformers are arranged in an inverted triangular shape.

[0013] The positive and progressive effects of this utility model are as follows: This utility model provides a motor protection device that integrates a current transformer, a function board, and a communication board. It simultaneously provides overload protection and electrical parameter measurement functions, eliminating the need for additional measuring equipment. Its compact size is achieved by arranging the copper strips and sheets along the inner wall of the device, minimizing internal space usage. The function board and communication board extend into the semi-enclosed structure of the copper strips, effectively utilizing space to maximize their size to meet hardware layout requirements, thus making the device's volume comparable to a traditional thermal relay. Reliable electrical protection is ensured by embedding the second housing into the intermediate groove formed by the outer and inner walls of the first housing, providing sufficient path size from the outside to the circuit board to meet electrical protection needs. High adaptability is also provided by the adjustable design of the second and third copper strip inlet holes in the second housing, allowing for adjustable spacing between the inlet copper strips to accommodate various contactor spacings. Compared to the traditional thermal relay plus electrical parameter measuring equipment solution, this simplifies the composition of the entire high-power electrical equipment operating circuit, reduces overall cost, decreases installation steps, and improves construction efficiency. Attached Figure Description

[0014] Figure 1 This is an exploded view of the motor protection device according to an embodiment of the present utility model; Figures 2(a)-(c) are schematic diagrams of the first shell structure of this utility model embodiment; Figures 3(a)-(b) are schematic diagrams of the second shell structure of an embodiment of the present invention; Figure 4 This is a schematic diagram of the copper strip and copper sheet assembly structure according to an embodiment of the present utility model; Figure 5 This is a longitudinal cross-sectional view of the motor protection device according to an embodiment of the present invention. Figures 6(a)-(c) are schematic diagrams of circuit board area protection of the motor protection device according to an embodiment of the present invention, 6(b) is a cross-sectional view of 6(a) AA, and 6(c) is a cross-sectional view of 6(a) BB. Figures 7(a)-(b) are schematic diagrams showing the adjustable spacing of the inlet terminals of the motor protection device according to an embodiment of the present invention; Figures 8(a)-(h) are schematic diagrams of the assembly process of the motor protection device according to an embodiment of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Please see Figure 1 - Figure 7 shows a motor protection device provided in this embodiment, including a first housing 1, a second housing 2, a copper strip and copper sheet assembly 3, a current transformer 4, a functional board 5, and a communication board 6.

[0017] The copper strip and sheet assembly 3 consists of three sets arranged sequentially. Each set of copper strip and sheet assembly 3 includes a copper sheet 3b and a copper strip 3a. The copper strip 3a is arranged in a U-shape. One end of the copper strip 3a is connected to the copper sheet 3b, and the other end is bent outward to form the inlet end. There are three current transformers 4. The three current transformers 4 are respectively inserted into the copper strips 3a of the three sets of copper strip and sheet assembly 3 and are arranged in a staggered manner in the vertical direction and in a triangular arrangement.

[0018] The middle of the rear wall inside the first housing 1 corresponds to the three sets of copper strip and copper sheet assemblies 3, and three copper sheet slots 1a are arranged side by side. Copper sheet fixing buckles 1b are provided in the copper sheet slots 1a. The three sets of copper strip and copper sheet assemblies 3 with the current transformer 4 installed are inserted into the first housing 1 from the front side. The copper sheet 3b is fixed in the copper sheet slot 1a by the copper sheet fixing buckle 1b, and the inlet end extends out of the first housing 1.

[0019] A copper strip wiring groove 1k is provided on the outer middle part of the rear wall of the first housing 1, corresponding to the copper strip groove 1a. A wiring screw 8 is provided in the copper strip wiring groove 1k. The wiring screw 8 is screwed into the connecting copper strip 3b and is used to connect external cables.

[0020] At least two sets of circuit board slots 1c are arranged parallel to each other on both sides of the first housing 1 in the vertical direction. The functional board 5 and the communication board 6 are respectively inserted into the first housing 1 through the circuit board slots 1c, so that the lower part of the functional board 5 and the communication board 6 is located in the middle of the copper strip 3a.

[0021] The copper sheet 3b is equipped with a voltage signal terminal 3c. Both the current transformer 4 and the voltage signal terminal 3c are electrically connected to the function board 5 to collect current and voltage signals.

[0022] The front wall of the second housing 2 is provided with inlet holes 2a corresponding to the copper strip and copper sheet assembly 3. There are three inlet holes 2a. When the second housing 2 is installed on the first housing 1, the inlet ends of the copper strips 3a of the three sets of copper strip and copper sheet assemblies 3 pass through the inlet holes 2a respectively to connect to the contactor.

[0023] Specifically, the copper strip 3a of the copper strip and copper sheet assembly 3 has an insulating layer inside the housing.

[0024] like Figure 5 As shown, in the motor protection device provided in this embodiment, the copper strips 3a to copper sheets 3b of the copper strip and copper sheet assembly 3 are arranged along the rear wall and bottom surface of the first housing to minimize the internal space occupation. The functional board 5 and the communication board 6 extend into the semi-enclosed structure of the copper strip 3a. The space effectively utilized allows the functional board 5 and the communication board 6 to reach the maximum size that can be achieved to meet the hardware layout requirements, thereby reducing the volume of the motor protection device.

[0025] In some embodiments, a functional terminal block 9 is also included. A functional board 5 is disposed near the front wall of the first housing 1 and facing the front wall. A functional port is provided on the functional board 5. A functional terminal slot is provided through the upper part of the front wall of the second housing 2. The functional terminal block 9 is inserted into the functional port through the functional terminal slot.

[0026] In some embodiments, a communication terminal block 10 is also included. A communication board 6 is disposed near the rear wall of the first housing 1 and facing the rear wall. A communication port is provided on the communication board 6. A communication terminal slot is provided through the upper part of the rear wall of the first housing 1. The communication terminal block 10 is inserted into the communication port through the communication terminal slot.

[0027] In some embodiments, a support plate 7 is also included. A support plate groove 1d and a limiting buckle 1e are provided on the outer side of the front wall of the first housing 1. The support plate 7 is inserted into the support plate groove 1d and its vertical position is limited by the limiting buckle 1e. The lower part of the support plate 7 is located behind the inlet end of the copper strip 3a of the copper strip and copper sheet assembly 3 to support the inlet end and prevent the inlet end of the copper strip 3a from being squeezed and deformed during the installation of the second housing 2, making it impossible to install into the inlet end hole 2a.

[0028] In some embodiments, the second housing 2 covers the first housing 1 from the front and top; the upper part of the two side walls of the first housing 1 is provided with a rear buckle 1f near the rear wall, the lower part of the two side walls of the first housing 1 is provided with a front buckle 1g near the front wall, the upper part of the two side walls of the second housing 2 is provided with a rear buckle groove 2b that matches the rear buckle 1f, the lower part of the two side walls of the second housing 2 is provided with a front buckle groove 2c that matches the front buckle 1g, and the first housing 1 and the second housing 2 are connected by the front buckle 1f and the front buckle groove 2c and the rear buckle 1f and the rear buckle groove 2b.

[0029] In some embodiments, the lower parts of both sides of the first housing 1 are provided with an inner sidewall 1i and an outer sidewall 1h and form a middle groove 1j. The lower parts of both sides of the second housing 2 are provided with an embedded wall 2d. When the first housing 1 and the second housing 2 are fastened together, the embedded wall 2d of the second housing 2 is embedded in the middle groove 1j of the first housing 1.

[0030] Referring to Figures 6(a)-(c), the motor protection device provided in this embodiment, as shown in Figure 6(b), has the embedded wall 2d of the second housing 2 embedded in the intermediate groove 1j formed by the outer side wall 1h and the inner side wall 1i of the first housing 1, so that the external path to the circuit board is sufficiently sized to meet the electrical protection requirements. As shown in Figure 6(c), this is the highest dimension of the inner side wall 1i and the embedded wall 2d, and the external path to the circuit board is also sufficiently sized to meet the electrical protection requirements.

[0031] In some embodiments, the second and third inlet holes 2a of the second housing 2 are connected by an adjustment groove and an adjustment hole to adjust the position of the copper strip 3a inserted into the inlet hole 2a to match contactors with different wiring spacings.

[0032] Referring to Figures 7(a)-(b), the motor protection device provided in this embodiment, as shown in Figure 7(a), has a smaller first gap at the inlet end of the copper bar 3a; and as shown in Figure 7(b), has a larger second gap at the inlet end of the copper bar 3a, in order to match two contactors with wiring gaps having a first gap and a second gap respectively.

[0033] In some embodiments, the current transformer 4 is inserted into one side of the copper strip 3a connecting the copper sheet 3b, and the three current transformers 4 are arranged in an inverted triangular shape.

[0034] Please refer to Figure 8. This utility model also provides an assembly method for the above-mentioned motor protection device, which includes the following steps: Three sets of copper strip and copper sheet assemblies 3 and three current transformers 4 are provided. The current transformers 4 are sequentially installed into one side of the copper strip 3a connecting the copper sheet 3b of the copper strip and copper sheet assembly 3.

[0035] A first housing 1 is provided, and the three sets of copper strip and copper sheet assemblies 3 assembled with the current transformer 4 are installed together into the first housing 1, so that the copper sheet 3b of the copper strip and copper sheet assembly 3 is installed into the copper sheet groove 1a, and the copper sheet 3b is fixed by the copper sheet fixing buckle 1b.

[0036] A function board 5 and a communication board 6 are provided. The function board 5 and the communication board 6 are installed into the first housing 1 along the circuit board groove 1c of the first housing 1, so that the lower part of the function board 5 and the communication board 6 is located in the middle of the copper strip 3a.

[0037] A second housing 2 is provided, which covers the first housing 1 from the front and top. The inlet end of the copper strip 3a extends from the inlet end hole 2a of the second housing 2. The front buckle 1g and the rear buckle 1f of the first housing 1 are fastened to the front buckle groove 2c and the rear buckle groove 2b of the second housing 2, respectively. The embedded wall 2d of the second housing 2 is embedded in the intermediate groove 1j formed by the outer side wall 1h and the inner side wall 1i of the first housing 1.

[0038] The system provides a functional terminal block 9, a communication terminal block 10, and a wiring screw 8. The functional terminal block 9 is inserted into the functional port of the functional board 5 through the functional terminal slot of the second housing 2. The communication terminal block 10 is inserted into the communication port of the communication board 6 through the communication terminal slot of the first housing 1. The wiring screw 8 is screwed into the copper sheet 3b through the copper sheet wiring slot 1k of the first housing 1 to complete the installation.

[0039] In some embodiments, a support plate groove 1d and a limiting buckle 1e are provided on the outer side of the front wall of the first housing 1. Before installing the second housing 2 onto the first housing 1, the following steps are also included: A support plate 7 is provided, which is installed along the support plate groove 1d to the front side of the first housing 1 and fixed by the limiting buckle 1e, so that the lower part of the support plate 7 is located behind the inlet end of the copper strip 3a of the copper strip and copper sheet assembly 3 to support the inlet end.

[0040] In summary, the motor protection device provided by this utility model has both overload protection and electrical parameter measurement functions. Through the ingenious layout of its internal structure, it has the same size as a traditional thermal relay. Compared with the traditional thermal relay plus electrical parameter measurement device, this utility model has significant advantages, simplifies the composition of the entire high-power motor operating circuit, reduces the overall cost, reduces installation steps, and improves construction efficiency.

[0041] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A motor protection device, characterized in that, It includes a first housing, a second housing, copper strip and copper sheet assemblies, a current transformer, a function board, a communication board, function terminals, and communication terminals; The copper strip and copper sheet assembly consists of three sets arranged sequentially. Each set of the copper strip and copper sheet assembly includes a copper sheet and a copper strip. The copper strip is arranged in a U-shape. One end of the copper strip is connected to the copper sheet, and the other end is bent outward to form the inlet end. There are three current transformers. The three current transformers are respectively inserted into the copper strips of the three sets of copper strip and copper sheet assemblies. They are arranged vertically in a staggered manner and in a triangular arrangement. The first housing contains three copper strip slots arranged side by side corresponding to the three sets of copper strip and copper sheet assemblies. Copper sheet fixing buckles are provided in the copper sheet slots. The three sets of copper strip and copper sheet assemblies with the current transformer installed are placed into the first housing. The copper sheets are fixed in the copper sheet slots by the copper sheet fixing buckles. The inlet end extends out of the first housing. The first housing has at least two sets of circuit board slots on both sides. The functional board and the communication board are respectively inserted into the first housing through the circuit board slots, such that the lower parts of the functional board and the communication board are located in the middle of the copper strip. The copper sheet is provided with a voltage signal terminal, and both the current transformer and the voltage signal terminal are electrically connected to the functional board to collect current signals and voltage signals. The function board is provided with function ports, and the function terminals are connected to the function ports; The communication board is provided with a communication port, and the communication terminal is connected to the communication port; The front wall of the second housing is provided with inlet holes corresponding to the copper strip and copper sheet assembly. There are three inlet holes. When the second housing is installed on the first housing, the inlet ends of the copper strips of the three sets of copper strip and copper sheet assemblies pass through the inlet holes to connect to the contactor.

2. The motor protection device as described in claim 1, characterized in that, The outer side of the first housing is provided with a copper plate wiring groove corresponding to the copper plate groove. A wiring screw is provided in the copper plate wiring groove. The wiring screw is screwed in to connect the copper plate. The wiring screw is used to connect external cables.

3. The motor protection device as described in claim 1, characterized in that, The functional board is located near and facing the front wall of the first housing. A functional terminal slot is provided through the upper part of the front wall of the second housing. The functional terminal is inserted into and connected to the functional port through the functional terminal slot.

4. The motor protection device as described in claim 1, characterized in that, The communication board is positioned close to and facing the rear wall of the first housing. A communication terminal slot is provided through the upper part of the rear wall of the first housing, and the communication terminal is inserted into and connected to the communication port via the communication terminal slot.

5. The motor protection device as described in claim 1, characterized in that, It also includes a support plate. The outer side of the front wall of the first housing is provided with a support plate groove and a limiting buckle. The support plate is inserted into the support plate groove and its vertical position is limited by the limiting buckle. The lower part of the support plate is located behind the inlet end of the copper strip of the copper strip assembly to support the inlet end.

6. The motor protection device as described in claim 1, characterized in that, The second housing covers the first housing from the front and top; the upper part of the two side walls of the first housing is provided with a rear buckle near the rear wall, the lower part of the two side walls of the first housing is provided with a front buckle near the front wall, the upper part of the two side walls of the second housing is provided with a rear buckle groove that matches the rear buckle, the lower part of the two side walls of the second housing is provided with a front buckle groove that matches the front buckle, and the first housing and the second housing are connected by the front buckle and the front buckle groove and the rear buckle and the rear buckle groove.

7. The motor protection device as described in claim 6, characterized in that, The lower parts of both sides of the first housing are provided with inner sidewalls and outer sidewalls and form a middle groove. The lower parts of both sides of the second housing are provided with embedding walls. When the first housing and the second housing are fastened together, the embedding walls of the second housing are embedded in the middle groove of the first housing.

8. The motor protection device as described in claim 1, characterized in that, The second and third inlet holes of the second housing are connected by an adjustment groove and an adjustment hole, which are used to adjust the position of the copper strip inserted into the inlet hole to match contactors with different wiring spacing.

9. The motor protection device as described in claim 1, characterized in that, The current transformer is inserted into one side of the copper strip connecting the copper sheet, and the three current transformers are arranged in an inverted triangular shape.

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