4p leakage protector

Abstract

The utility model provides a 4P leakage protector, including casing, handle and handle's operating mechanism, set up in the protection mechanism in casing, the terminal and install in the electromagnetic tripper of casing end part, the casing includes first shell cover, first shell seat, second shell seat, third shell seat and second shell cover of sequential phase joint cooperation, still include test device and auxiliary switch, test device includes test button, test resistance and electricity spring, first shell seat top has been seted up with test device and has slid and connected cooperation's sliding mouth, auxiliary switch includes with operating mechanism's touch piece and in the shell's conduction piece, first shell seat, second shell seat, third shell seat are provided with first arc extinguishing cover, second arc extinguishing cover, third arc extinguishing cover respectively in, the width of first arc extinguishing cover is less than second arc extinguishing cover, third arc extinguishing cover's width. The utility model discloses stable structure, high safety and stable performance.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a 4P leakage current protector. Background Technology

[0002] The "4P" in a 4P residual current device (RCD) represents four poles, meaning the device has four switching contacts that can simultaneously control three live wires (L1 / L2 / L3) and one neutral wire (N). 4P RCDs are generally used in large industrial enterprises, hospitals, high-speed railways, and other locations with high power supply requirements. However, existing 4P RCDs lack auxiliary switches in their test circuits, making the circuit prone to prolonged energization. This can damage the test resistors, leading to safety accidents and compromising the device's safety. Furthermore, the current transformers in existing 4P RCDs are small and their performance is unstable. Utility Model Content

[0003] Based on the above problems, the purpose of this utility model is to provide a 4P leakage current protector that is structurally stable, highly safe, and has stable performance.

[0004] To address the above problems, the following technical solution is provided: a 4P residual current device (RCD), comprising a housing, a handle and an operating mechanism linked to the handle, a protection mechanism disposed within the housing, a terminal block located at the end of the housing, and an electromagnetic trip unit installed within the housing. The housing comprises a first housing cover, a first housing base, a second housing base, a third housing base, and a second housing cover that are sequentially connected and fitted together. The terminal block is disposed between each of the first housing cover, the first housing base, the second housing base, the third housing base, and the second housing cover. The protection mechanism is disposed within each of the first housing base, the second housing base, and the third housing base. The device also includes a testing device and an auxiliary switch. An installation groove is provided within the first housing base. The testing device includes a test button, a test resistor, and a torsion spring. An opening is provided at the top of the first housing base. The device has a sliding groove that slides into the test device. A protruding post for mounting a torsion spring is provided in the mounting groove. One end of the torsion spring abuts against the test button, and the other end abuts against the test resistor. The test resistor is located in the mounting groove. A receiving groove is provided on one side of the mounting groove in the first housing. The auxiliary switch includes a contact piece that is linked to the operating mechanism and a conductive piece located in the housing. The contact piece abuts or separates from the conductive piece by linking with the operating mechanism. A fixing groove is provided on the lower side of the mounting groove. A current transformer is installed in the fixing groove. A first arc extinguishing hood, a second arc extinguishing hood, and a third arc extinguishing hood are respectively provided in the first housing, the second housing, and the third housing. The width of the first arc extinguishing hood is smaller than the width of the second and third arc extinguishing hoods.

[0005] The present invention is further configured such that the test button includes a pressing part protruding from the top of the sliding opening, a limiting part connected to one side of the pressing part and cooperating with the first housing seat, and an abutting part located in the mounting groove, wherein the bottom end of the abutting part is provided with a latch that abuts and cooperates with the power-connecting torsion spring.

[0006] The present invention is further provided that limit blocks are provided protruding on both sides of the abutment portion within the mounting groove.

[0007] The present invention is further provided that the mounting groove is covered with a cover plate, and the outer edge of the cover plate is provided with a retaining edge on the side facing the mounting groove.

[0008] The present invention is further provided that the conductive piece has raised limiting ridges on both sides.

[0009] The present invention is further configured such that a cover is provided inside the first housing and placed on the receiving groove, and the cover is provided with a protruding ridge corresponding to the limiting ridge.

[0010] The present invention is further provided that one end of the cover is provided with an insert block inserted between the two limiting edges.

[0011] The present invention is further configured such that the electromagnetic trip device is installed on the side of the cover plate facing the first housing cover, and the electromagnetic trip device is covered with a shielding cover.

[0012] The present invention is further configured such that the shielding cover is semi-enclosed relative to the electromagnetic trip unit, and an arc-shaped notch is provided at one end of the shielding cover.

[0013] The beneficial effects of this utility model are: 1. By setting an auxiliary switch, the test circuit can also be disconnected when the circuit breaker of this utility model is tripped, thereby protecting the circuit and improving the safety of this utility model. 2. By reducing the width of the first arc-extinguishing shield, the fixing slot opposite to the first arc-extinguishing shield can be extended inward, thereby increasing the installation space of the fixing slot. This allows for the installation of larger current transformers, improving the reliability and performance stability of the leakage current protection of this utility model. Reducing the size of the first arc-extinguishing shield does not affect the overall performance of this utility model and complies with relevant standards. 3. By setting a limiting edge to fix the conductive piece, the stability of the conductive piece can be improved, thereby improving the stability of the test circuit and the stability of the performance of this utility model.

[0014] 4. By setting up a shield, the influence of external magnetic fields on the electromagnetic trip unit can be reduced, thereby improving the stability of the electromagnetic trip unit's function and signal transmission, and improving the reliability of this utility model. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the internal structure of the casing of this utility model. Figure 1 .

[0017] Figure 3 This is a schematic diagram of the internal structure of the casing of this utility model. Figure 2 .

[0018] Figure 4 This is a schematic diagram of the internal structure of the casing of this utility model. Figure 3 .

[0019] Figure 5 This is a schematic diagram of the internal components of the housing of this utility model.

[0020] Figure 6 This is a schematic diagram of the test button in this utility model.

[0021] Figure 7 This is a schematic diagram of the structure of the first housing and the test button in this utility model.

[0022] Figure 8 This is a schematic diagram of the structure of the cap and cover plate in this utility model.

[0023] Figure 9 This is a schematic diagram of the electromagnetic trip device in this utility model.

[0024] Figure 10 This is a schematic diagram of the shielding cover in this utility model.

[0025] The labels in the diagram mean: 1-House; 2-Handle; 3-Operating mechanism; 4-Protective mechanism; 5-Terminal; 6-Electromagnetic trip unit; 11-First housing cover; 12-First housing base; 13-Second housing base; 14-Third housing base; 15-Second housing cover; 7-Test device; 8-Auxiliary switch; 121-Mounting slot; 71-Test button; 72-Test resistor; 73-Electrified torsion spring; 122-Slide; 123-Protrusion; 124-Receiving slot; 81-Touch 82-Conducting piece; 17-Fixing groove; 9-Inverter; 125-First arc extinguishing cover; 131-Second arc extinguishing cover; 141-Third arc extinguishing cover; 711-Pressing part; 712-Limiting part; 713-Abutting part; 7131-Bayonet; 126-Limiting block; 1211-Cover plate; 12111-Side guard; 128-Limiting ridge; 1241-Sealing cover; 12411-Protruding ridge; 12412-Insertion block; 61-Shielding cover; 611-Arc-shaped notch. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] It should be noted that all directional indicators (such as up, down, top, bottom, tip, bottom, etc.) in the description of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly. The protection mechanism described in this utility model includes short-circuit protection devices, leakage protection devices, and overload protection devices, etc. The protection mechanism, handle, operating mechanism, and trip unit are all existing conventional technologies.

[0028] like Figures 1 to 10 The 4P residual current device (RCD) shown includes a housing 1, a handle 2, an operating mechanism 3 linked to the handle 2, a protection mechanism 4 disposed within the housing 1, a terminal block 5 located at the end of the housing 1, and an electromagnetic trip unit 6 installed within the housing 1. The housing 1 includes a first cover 11, a first base 12, a second base 13, a third base 14, and a second cover 15 sequentially connected. The terminal block 5 is disposed between each of the first cover 11, first base 12, second base 13, third base 14, and second cover 15. The protection mechanism 4 is disposed within each of the first base 12, second base 13, and third base 14. The device also includes a testing device 7 and an auxiliary switch 8. The first base 12 has a mounting groove 121. The testing device 7 includes a test button 71, a test resistor 72, and a torsion spring 73. The top of the first base 12 has a sliding groove 1 that slides into the testing device 7. 22. A protruding post 123 for mounting a torsion spring 73 is provided in the mounting groove 121. One end of the torsion spring abuts against the test button 71, and the other end abuts against the test resistor 72. The test resistor 72 is located in the mounting groove 121. A receiving groove 124 is provided in the first housing 12 on one side of the mounting groove 121. The auxiliary switch 8 includes a contact piece 81 linked with the operating mechanism 3 and a conductive piece 82 located in the housing 1. The contact piece 81 abuts or separates from the conductive piece 82 by linking with the operating mechanism 3. A fixing groove 17 is provided on the lower side of the mounting groove 121. A current transformer 9 is installed in the fixing groove 17. A first arc extinguishing cover 125, a second arc extinguishing cover 131, and a third arc extinguishing cover 141 are respectively provided in the first housing 12, the second housing 13, and the third housing 14. The width of the first arc extinguishing cover 125 is smaller than the width of the second arc extinguishing cover 131 and the third arc extinguishing cover 141.

[0029] In the above structure, the operating mechanism 3 is controlled by the handle 2 to close and open the circuit breaker. The contact piece 81 is linked with the operating mechanism 3 to abut or separate from the conductive piece 82. By pressing the test button 71, the connecting torsion spring 73 abuts or separates from the other end of the conductive piece 82, thus electrically connecting or disconnecting the conductive piece 82 from the test resistor 72. The sliding joint 122 facilitates the sliding engagement of the test button 71 with the first housing 12, and the test button 71 is reset by the elastic force of the connecting torsion spring 73. By reducing the width of the first arc-extinguishing cover 125, the fixing groove 17 opposite to the first arc-extinguishing cover 125 can be extended inward, thereby increasing the installation space of the fixing groove 17. This allows the fixing groove 17 to install a larger current transformer 9, improving the reliability and stability of the leakage current protection of this utility model. Reducing the size of the first arc-extinguishing cover 125 does not affect the overall performance of this utility model and meets the relevant standards.

[0030] The present invention is further configured such that the test button 71 includes a pressing part 711 provided at the top of the protruding slide 122, a limiting part 712 connected to one side of the pressing part 711 and limited to the first housing 12, and an abutting part 713 located in the mounting groove 121. The bottom end of the abutting part 713 is provided with a latch 7131 that abuts and cooperates with the power-connecting torsion spring 73.

[0031] In the above structure, the limiting part 712 can limit the test button 71 to prevent it from falling off the first housing 12. The bayonet 7131 can improve the stability of the test button 71 in cooperation with the power-connecting torsion spring 73, thereby improving the reliability of this utility model.

[0032] The present invention is further configured such that limiting blocks 126 protrude from both sides of the abutment portion 713 within the mounting groove 121.

[0033] In the above structure, the stability of the sliding of the test button 71 can be improved by setting the limit block 126, thereby improving the reliability of this utility model.

[0034] The present invention is further provided that the mounting groove 121 is covered with a cover plate 1211, and the outer edge of the cover plate 1211 facing the mounting groove 121 is provided with a retaining edge 12111.

[0035] In the above structure, the cover plate 1211 can protect the test device 7 and improve the compactness of the structure, thereby improving the stability of the present invention. The baffle 12111 can further limit the test resistor 72, thereby improving the stability of the test resistor 72 and improving the structural strength of the present invention.

[0036] The present invention is further configured such that the conductive piece 82 has protruding limiting ridges 128 on both sides.

[0037] In the above structure, the stability of the conductive piece 82 can be improved by setting the limiting ridge 128, thereby improving the reliability of the contact piece 81 and the conductive piece 82 abutting and cooperating.

[0038] The present invention is further configured such that a cover 1241 covering the receiving groove 124 is provided in the first housing 12, and a protruding ridge 12411 corresponding to the limiting ridge 128 is provided on the cover 1241.

[0039] In the above structure, the cover 1241 protects the auxiliary switch 8 and prevents it from affecting external components when the auxiliary switch 8 is opened or closed, thereby improving the safety and reliability of this invention. The protruding ridge 12411 further limits the movement of the conductive piece 82, thus further improving its stability.

[0040] The present invention is further configured such that one end of the cover 1241 is provided with an insert block 12412 inserted between the two limiting edges 128.

[0041] In the above structure, by setting the insert block 12412, the connection strength between the cover 1241 and the first housing 12 can be improved, thereby improving the reliability of this utility model.

[0042] The present invention is further configured such that the electromagnetic trip unit 6 is installed on the side of the cover plate 1211 facing the first housing cover 11, and the electromagnetic trip unit 6 is covered with a shielding cover 61.

[0043] In the above structure, by setting the shield 61, the influence of the external magnetic field on the electromagnetic trip unit 6 can be reduced, thereby improving the stability of the function and signal transmission of the electromagnetic trip unit 6 and improving the reliability of this utility model.

[0044] The present invention is further configured such that the shielding cover 61 is semi-enclosed relative to the electromagnetic trip unit 6, and an arc-shaped notch 611 is provided at one end of the shielding cover 61.

[0045] In the above structure, by setting an arc-shaped notch 611, the shielding cover 61 can be prevented from fitting too closely to the electromagnetic trip unit 6, thus making it impossible to remove the shielding cover 61, thereby facilitating the installation and removal of the shielding cover 61.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A 4P residual current device (RCD), comprising a housing, a handle and an operating mechanism linked to the handle, a protection mechanism disposed within the housing, a terminal block located at the end of the housing, and an electromagnetic trip unit installed within the housing, wherein the housing comprises a first housing cover, a first housing base, a second housing base, a third housing base, and a second housing cover sequentially connected, the terminal block being disposed between the first housing cover, the first housing base, the second housing base, the third housing base, and the second housing cover, and the protection mechanism being disposed within the first housing base, the second housing base, and the third housing base, characterized in that: It also includes a testing device and an auxiliary switch. The first housing has a mounting groove. The testing device includes a test button, a test resistor, and a torsion spring. The top of the first housing has a sliding opening that slides into the testing device. A protruding post for mounting the torsion spring is provided in the mounting groove. One end of the torsion spring abuts against the test button, and the other end abuts against the test resistor. The test resistor is located in the mounting groove. A receiving groove is provided on one side of the mounting groove in the first housing. The auxiliary switch includes a contact piece that is linked to the operating mechanism and a conductive piece located in the housing. The contact piece abuts or separates from the conductive piece by linking with the operating mechanism. A fixing groove is provided on the lower side of the mounting groove. A current transformer is installed in the fixing groove. A first arc extinguishing hood, a second arc extinguishing hood, and a third arc extinguishing hood are respectively provided in the first housing, the second housing, and the third housing. The width of the first arc extinguishing hood is smaller than the width of the second and third arc extinguishing hoods.

2. A 4P residual current device according to claim 1, characterized in that: The test button includes a pressing part protruding from the top of the slide, a limiting part connected to one side of the pressing part and cooperating with the first housing seat, and an abutting part located in the mounting groove. The bottom end of the abutting part is provided with a latch that abuts and cooperates with the power-connecting torsion spring.

3. A 4P residual current device according to claim 2, characterized in that: Limiting blocks are provided protruding on both sides of the abutment portion inside the mounting groove.

4. A 4P residual current device according to claim 1, characterized in that: The mounting groove is covered with a cover plate, and the outer edge of the cover plate facing the mounting groove is provided with a retaining edge.

5. A 4P residual current device according to claim 1, characterized in that: The conductive plate has raised limiting ridges on both sides.

6. A 4P residual current device according to claim 5, characterized in that: The first housing is provided with a cover that covers the receiving groove, and the cover is provided with a protruding ridge corresponding to the limiting ridge.

7. A 4P residual current device according to claim 6, characterized in that: One end of the cover is provided with an insert block that is inserted between the two limiting edges.

8. A 4P residual current device according to claim 4, characterized in that: The electromagnetic trip unit is installed on the side of the cover plate facing the first housing cover, and the electromagnetic trip unit is covered with a shielding cover.

9. A 4P residual current device according to claim 8, characterized in that: The shielding cover is semi-enclosed relative to the electromagnetic trip unit, and an arc-shaped notch is provided at one end of the shielding cover.

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