Three-phase under-voltage protector

Abstract

The utility model discloses three -phase under -voltage protector, it includes upper casing and lower casing, the upper casing is located lower casing upper end, the bottom fixedly connected with fixed mechanism of upper casing, the both ends of lower casing are equipped with hand screw bolt no.

Description

Technical Field

[0001] This utility model relates to the field of undervoltage protection technology, and particularly to a three-phase undervoltage protection device. Background Technology

[0002] Three-phase undervoltage protectors are protective devices specifically designed for three-phase AC power systems (such as industrial 380V / 400V, 660V, etc.). Their core function is to automatically cut off the power supply when any phase or the overall voltage of the three phases is lower than the safety threshold, or when there are problems such as phase loss or severe imbalance, thus protecting three-phase electrical equipment (especially motors, compressors, frequency converters, etc.).

[0003] The casing of a three-phase undervoltage protector is usually secured with bolts, which requires tools to disassemble during maintenance, affecting maintenance efficiency. Furthermore, the casing of a three-phase undervoltage protector is usually made of plastic, which has limited strength. Repeated disassembly of the bolts can easily cause wear on the threads of the casing, making it impossible for the bolts to secure the casing. Utility Model Content

[0004] The purpose of this utility model is to provide a three-phase undervoltage protector that allows for easy disassembly and assembly of the housing, and reduces wear on the housing during disassembly.

[0005] To achieve the above objectives, a three-phase undervoltage protector is provided, comprising an upper housing and a lower housing. The upper housing is located above the lower housing, and a fixing mechanism is fixedly connected to the bottom of the upper housing. Each end of the lower housing has a hand-tightening bolt, which penetrates the lower housing and is threadedly connected to it. One end of each hand-tightening bolt is rotatably connected to a fixing post, and the lower end of the fixing post is slidably connected to the lower housing. A groove is formed on the surface of the fixing post, and a slot is formed on the side of the fixing post away from the hand-tightening bolt, with the slot located within the fixing mechanism and engaging with it. This design facilitates the disassembly and assembly of the three-phase undervoltage protector's housing and reduces wear on the housing during disassembly.

[0006] According to the three-phase undervoltage protector, the fixing mechanism consists of a housing, a locking block, a limiting plate, a spring, and a mounting bracket. The housing is fixedly connected to the bottom of the upper housing. The mounting bracket is located inside the housing and slidably connected to the inner wall of the housing. An adjustment port is provided at the bottom of the housing, through which the fixing post enters the housing. The limiting plate is located inside the mounting bracket and slidably connected to the inner wall of the mounting bracket. The locking block is fixedly connected to the middle of the end of the limiting plate facing the adjustment port, and the end of the locking block away from the limiting plate passes through the mounting bracket and slidably connects to it. The fixing post slides in the adjustment port, and the end of the locking block away from the limiting plate is inserted into the locking block. The spring is fixedly connected to the end of the limiting plate away from the locking block, and the other end of the spring is fixedly connected to the inner wall of the mounting bracket. The spring causes the locking block to move when the fixing post enters the housing. After the fixing post enters the housing, the spring pushes the locking block to reset and enter the locking slot, thereby fixing the upper and lower housings together.

[0007] According to the three-phase undervoltage protector, the upper end of the upper housing is provided with a second hand-tightening bolt, and the lower end of the second hand-tightening bolt passes through the upper housing and the outer housing in sequence. The lower end of the second hand-tightening bolt is rotatably connected to the upper end of the mounting bracket. The second hand-tightening bolt is used to raise the mounting bracket, thereby pulling the fixing column upward through the locking block in the mounting bracket, so that the upper housing and the lower housing are tightly connected.

[0008] According to the three-phase undervoltage protector, the bottom of the locking block facing the fixed post has a beveled surface. The beveled surface reduces wear between the top of the locking block and the locking block when the top of the locking block pushes against the locking block.

[0009] According to the three-phase undervoltage protector, two slide rails are symmetrically fixedly connected to the upper surface of the lower housing, and the slide rails pass through and are slidably connected to the slide grooves. The slide rails are used to guide the movement of the fixed column.

[0010] According to the three-phase undervoltage protector, an insulating sleeve two is fixedly connected to the inner wall of the lower housing, and an insulating sleeve one is fixedly connected to the side of the fixing post away from the slot. The insulating sleeve one extends into the insulating sleeve two and is slidably connected to the insulating sleeve two. The hand-tightening bolt one passes through the middle of the insulating sleeve one and the insulating sleeve two. The insulating sleeve one and the insulating sleeve two cooperate to provide insulation protection for the hand-tightening bolt one located inside the three-phase undervoltage protector.

[0011] The above solution has the following advantages: the upper and lower housings are fixed by the cooperation of the fixing column and the fixing mechanism. The spring pushes the locking block to move when the fixing column enters the housing. After the fixing column enters the housing, the spring pushes the locking block to reset and enter the locking slot, thereby fixing the upper and lower housings together. When the hand-tightening bolt is pulled, the fixing column is moved, causing the locking block to leave the locking slot of the fixing column, thereby separating the upper and lower housings. This facilitates the disassembly of the three-phase undervoltage protector and reduces the wear on the housing during disassembly.

[0012] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a perspective view of the three-phase undervoltage protector of this utility model;

[0015] Figure 2 This is a cross-sectional view of the upper housing of the three-phase undervoltage protector of this utility model;

[0016] Figure 3 This is a cross-sectional view of the lower housing of the three-phase undervoltage protector of this utility model;

[0017] Figure 4 This is a cross-sectional view of the fixing mechanism and fixing column of the three-phase undervoltage protector of this utility model.

[0018] Figure 5 for Figure 3 Enlarged view of point A in the middle.

[0019] Legend:

[0020] 1. Upper housing; 2. Fixing mechanism; 3. Hand-tightening bolt one; 4. Lower housing; 5. Fixing column; 6. Outer shell; 7. Adjustment port; 8. Slide groove; 9. Locking block; 10. Limiting plate; 11. Spring; 12. Mounting bracket; 13. Hand-tightening bolt two; 14. Slide rail; 15. Locking groove; 16. Insulating sleeve one; 17. Insulating sleeve two. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] Reference Figure 1-5The present invention relates to a three-phase undervoltage protector, which includes a housing and a lower housing 4. An upper housing 1 is located on the upper end of the lower housing 4. A fixing mechanism 2 is fixedly connected to the bottom of the upper housing 1. A hand-tightening bolt 3 is provided at both ends of the lower housing 4, and the hand-tightening bolt 3 passes through the lower housing 4 and is threadedly connected to the lower housing 4. A fixing post 5 is rotatably connected to one end of the hand-tightening bolt 3, and the lower end of the fixing post 5 is slidably connected to the lower housing 4. A sliding groove 8 is provided on the surface of the fixing post 5. A slot 15 is provided on the side of the fixing post 5 away from the hand-tightening bolt 3, and the slot 15 is located in the fixing mechanism 2 and cooperates with the fixing mechanism 2.

[0023] The fixing mechanism 2 consists of a housing 6, a locking block 9, a limiting plate 10, a spring 11, and a mounting bracket 12. The housing 6 is fixedly connected to the bottom of the upper housing 1. The mounting bracket 12 is located inside the housing 6 and is slidably connected to the inner wall of the housing 6. An adjustment port 7 is provided at the bottom of the housing 6, and the fixing post 5 enters the housing 6 through the adjustment port 7. The limiting plate 10 is located inside the mounting bracket 12 and is slidably connected to the inner wall of the mounting bracket 12. The locking block 9 is fixedly connected to the middle of the end of the limiting plate 10 facing the adjustment port 7, and the end of the locking block 9 away from the limiting plate 10 passes through the mounting bracket 12 and is slidably connected to the mounting bracket 12. The fixing post 5 slides in the adjustment port 7. The end of the locking block 9 away from the limiting plate 10 is inserted into the locking block 9. The spring 11 is fixedly connected to the end of the limiting plate 10 away from the locking block 9, and the other end of the spring 11 is fixedly connected to the inner wall of the mounting bracket 12. Spring 11 causes the fixing post 5 to push the locking block 9 to move when it enters the outer shell 6. After the fixing post 5 enters the outer shell 6, spring 11 pushes the locking block 9 to reset and enter the locking groove 15, thereby fixing the upper shell 1 and the lower shell 4 together.

[0024] The upper end of the upper housing 1 is provided with a second hand-tightening bolt 13, and the lower end of the second hand-tightening bolt 13 passes through the upper housing 1 and the outer housing 6 in sequence. The lower end of the second hand-tightening bolt 13 is rotatably connected to the upper end of the mounting bracket 12. The second hand-tightening bolt 13 is used to raise the mounting bracket 12, thereby pulling the fixing column 5 upward through the locking block 9 in the mounting bracket 12, so that the upper housing 1 and the lower housing 4 are tightly connected.

[0025] The bottom of the locking block 9 facing the fixing post 5 has a beveled surface. The beveled surface reduces wear between the top of the locking block 9 and the locking block 9 when the top of the locking block 9 pushes against the locking block 9.

[0026] Two slide rails 14 are symmetrically fixedly connected to the upper surface of the lower housing 4, and the slide rails 14 pass through the slide groove 8 and are slidably connected to the slide groove 8. The slide rails 14 are used to guide the movement of the fixed column 5.

[0027] An insulating sleeve 2 17 is fixedly connected to the inner wall of the lower housing 4. An insulating sleeve 1 16 is fixedly connected to the side of the fixing post 5 away from the slot 15, and the insulating sleeve 1 16 extends into the insulating sleeve 2 17 and is slidably connected to the insulating sleeve 2 17. A hand-tightening bolt 3 passes through the middle of the insulating sleeve 1 16 and the insulating sleeve 2 17. The insulating sleeve 1 16 and the insulating sleeve 2 17 cooperate to provide insulation protection for the hand-tightening bolt 3 located inside the three-phase undervoltage protector.

[0028] Working principle: During installation, the upper housing 1 and the lower housing 4 are connected, allowing the fixing post 5 in the lower housing 4 to enter the outer housing 6 through the adjustment port 7. During this process, the fixing post 5 pushes the locking block 9 to move, and the spring 11 is compressed. After the locking groove 15 on the surface of the fixing post 5 is at the height of the locking block 9, the spring 11 pushes the locking block 9 into the locking groove 15. By rotating the second hand-tightening bolt 13, the mounting bracket 12 drives the locking block 9 to rise, thereby lifting the fixing post 5 upwards and making the upper housing 1 and the lower housing 4 tightly connected. When disassembling the three-phase undervoltage protector, rotate the second hand-tightening bolt 13 in the opposite direction so that the mounting bracket 12 is located at the bottom of the outer housing 6. Then rotate the first hand-tightening bolt 3 so that the first hand-tightening bolt 3 pulls the fixing post 5 to move in the adjustment port 7, causing the locking block 9 to leave the locking groove 15 of the fixing post 5, and the upper housing 1 and the lower housing 4 are separated.

[0029] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. Three-phase undervoltage protector, including: The upper shell (1) and the lower shell (4) are characterized in that the upper shell (1) is located at the upper end of the lower shell (4), the bottom of the upper shell (1) is fixedly connected to a fixing mechanism (2), the two ends of the lower shell (4) are respectively provided with a hand-tightening bolt (3), and the hand-tightening bolt (3) passes through the lower shell (4) and is threadedly connected to the lower shell (4), one end of the hand-tightening bolt (3) is rotatably connected to a fixing post (5), and the lower end of the fixing post (5) is slidably connected to the lower shell (4), the surface of the fixing post (5) is provided with a sliding groove (8), and the side of the fixing post (5) away from the hand-tightening bolt (3) is provided with a slot (15), and the slot (15) is located in the fixing mechanism (2) and cooperates with the fixing mechanism (2).

2. The three-phase undervoltage protector according to claim 1, characterized in that, The fixing mechanism (2) consists of a shell (6), a locking block (9), a limiting plate (10), a spring (11), and a mounting bracket (12). The shell (6) is fixedly connected to the bottom of the upper shell (1). The mounting bracket (12) is located inside the shell (6) and is slidably connected to the inner wall of the shell (6). An adjustment port (7) is provided at the bottom of the shell (6), and the fixing column (5) enters the shell (6) through the adjustment port (7). The limiting plate (10) is located inside the mounting bracket (12) and is slidably connected to the inner wall of the mounting bracket (12). The locking block (9) is fixedly connected to the middle of the end of the limiting plate (10) facing the adjustment port (7), and the end of the locking block (9) away from the limiting plate (10) passes through the mounting frame (12) and is slidably connected to the mounting frame (12). The fixing column (5) slides in the adjustment port (7). The end of the locking block (9) away from the limiting plate (10) is inserted into the locking block (9). The spring (11) is fixedly connected to the end of the limiting plate (10) away from the locking block (9), and the other end of the spring (11) is fixedly connected to the inner wall of the mounting frame (12).

3. The three-phase undervoltage protector according to claim 2, characterized in that, The upper end of the upper housing (1) is provided with a second hand-tightening bolt (13), and the lower end of the second hand-tightening bolt (13) passes through the upper housing (1) and the outer shell (6) in sequence. The lower end of the second hand-tightening bolt (13) is rotatably connected to the upper end of the mounting bracket (12).

4. The three-phase undervoltage protector according to claim 2, characterized in that, The bottom of the card block (9) facing the fixed post (5) has a beveled surface.

5. The three-phase undervoltage protector according to claim 1, characterized in that, The upper surface of the lower housing (4) is symmetrically fixedly connected with two slide rails (14), and the slide rails (14) pass through the slide groove (8) and are slidably connected with the slide groove (8).

6. The three-phase undervoltage protector according to claim 1, characterized in that, The inner wall of the lower housing (4) is fixedly connected to an insulating sleeve two (17), and the side of the fixed column (5) away from the slot (15) is fixedly connected to an insulating sleeve one (16), and the insulating sleeve one (16) extends into the insulating sleeve two (17) and is slidably connected to the insulating sleeve two (17). The hand-tightening bolt one (3) passes through the middle of the insulating sleeve one (16) and the insulating sleeve two (17).

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