Cable fixing device for household gas alarm

Abstract

The utility model discloses a cable fixing device for a household gas alarm, which belongs to the technical field of household alarms and comprises a plurality of wiring terminal male heads and a plurality of wiring terminal female heads, the plurality of wiring terminal male heads are fixedly arranged on a PCB (printed circuit board), and the PCB is arranged in the internal space of an upper shell and a lower shell. The wiring terminal female head is fixedly arranged on the input / output cable; notches are formed in the positions, corresponding to the wiring terminal male head, of the upper shell and the lower shell, and the notches of the upper shell and the lower shell jointly form a jack; and the wiring terminal female head is plugged with the wiring terminal male head. According to the utility model, through arranging the wiring terminal male head and the wiring terminal female head, when the device is used, the wiring terminal female head enters from the jack and is plugged with the wiring terminal male head in the internal space, thereby realizing wiring fixation of input and output cables; and wiring is convenient and plug-and-play.

Description

Technical Field

[0001] This utility model belongs to the technical field of home alarm devices, and in particular relates to a cable fixing device for home gas alarm devices. Background Technology

[0002] The wiring method of the input (power supply) and output (alarm signal output) lines of a household gas alarm directly affects its installation convenience, reliability, and system integration capabilities. Below are several wiring methods, each with its own disadvantages:

[0003] 1. Terminal connection: Power cord and alarm output line are directly connected using screw terminals or spring terminals. It typically supports 0.5~2.5mm² wires, requiring manual crimping or screw fixing, and necessitates power-off operation, making it unsuitable for applications with frequent relocation. It also has poor scalability; separate wiring is required when networking multiple devices, increasing construction costs. After long-term use, terminals may loosen or corrode, requiring regular inspection.

[0004] 2. Bus-based connection uses digital communication to transmit alarm signals and supports parallel connection of multiple devices. However, it is more expensive, requires a dedicated protocol conversion module, increases system complexity, is particularly reliant on the host, and bus failure may paralyze the entire system. It requires redundant design, has a high installation threshold, and requires professional debugging. It is suitable for pre-wiring in newly built residential buildings, intelligent security systems, and centralized monitoring of commercial buildings.

[0005] 3. Wireless repeater wiring uses wireless communication (such as Zigbee 3.0, Wi-Fi, LoRa) to transmit alarm signals. Some models support battery power and can be used in a wired + wireless hybrid mode. However, it depends on signal strength. Metal structures and thick walls may affect transmission stability. Battery power requires periodic replacement or may rely on an external power source. Compared to wired solutions, wireless transmission may have a delay of 100~500ms. It eliminates the need for wiring and is suitable for later installation, such as in rental housing, old house renovation, and smart home expansion. Utility Model Content

[0006] The purpose of this utility model is to provide a cable fixing device for household gas alarms, which has the advantages of convenient wiring and plug-and-play, and has a simple structure and reliable connection. It effectively solves the problems of troublesome wiring operation, high installation threshold and signal transmission delay in the prior art.

[0007] The present invention adopts the following technical solution: a cable fixing device for a household gas alarm, including male terminal blocks and female terminal blocks, a plurality of male terminal blocks are fixedly mounted on a PCB board, the PCB board is set in the internal space of the upper shell and the lower shell, and the female terminal blocks are fixedly mounted on the input and output cables; notches are opened at the positions of the upper shell and the lower shell corresponding to the male terminal blocks, and the notches of the upper shell and the lower shell together form a socket; the female terminal block is inserted into the male terminal block.

[0008] Furthermore, an elastic piece corresponding to the male connector of the wiring terminal is fixedly provided on the inner bottom wall of the lower housing, and a first buckle is fixedly provided at the end of the elastic piece; a second buckle adapted to the first buckle is fixedly provided on the lower end face of the female connector of the wiring terminal.

[0009] Furthermore, a through hole is provided on the inner bottom wall of the lower shell, the elastic sheet is L-shaped, the bottom end of the vertical part of the elastic sheet is fixedly installed with the inner bottom wall of the lower shell, the left side of the upper end face of the horizontal part of the elastic sheet is fixedly installed with the first buckle, a compensation block is fixedly installed on the lower end face of the horizontal part of the elastic sheet, the compensation block extends downward into the through hole, and a back plate is fixedly installed on the lower end face of the lower shell by bolts, the lower end face of the compensation block abuts against the inner side of the back plate.

[0010] Furthermore, the left and right sides of the first and second buckles are respectively set as a first inclined surface and a second inclined surface. The first inclined surface of the first buckle and the second inclined surface of the second buckle are parallel, the second inclined surface of the first buckle and the first inclined surface of the second buckle are parallel, and the angle between the second inclined surface of the first buckle and the vertical plane is greater than the angle between the first inclined surface of the first buckle and the vertical plane.

[0011] Furthermore, the lower end face of the lower shell is provided with a sliding groove, and the back plate is slidably disposed in the sliding groove in the left and right direction. When the back plate slides to the right side, it can be fixed to the lower shell by bolts.

[0012] Furthermore, a frame is fixedly installed inside the notch of the lower shell. After the upper shell and the lower shell are fixed, the frame is located inside the socket and contacts the inner sidewall of the notch of the upper shell and the lower shell. Two side plates are fixedly installed on the PCB board at the position corresponding to the male connector of the terminal block in the left and right direction. The two side plates are located on the front and rear sides of the male connector of the terminal block, and the right side of the two side plates is connected to the frame after the PCB board is fixed inside the lower shell.

[0013] Furthermore, the male terminal is an inverted L-shaped terminal, the vertical part of which is fixed to the PCB board and electrically connected to it, and the female terminal has a plug hole on its end face.

[0014] Furthermore, each frame has a foolproof protrusion on its inner top wall, and each terminal female has a guide groove on its upper surface that corresponds to the foolproof protrusion. The foolproof protrusions on each frame are different from those on the other frames in the front-back direction.

[0015] Furthermore, a number of limiting plates are fixedly provided on the upper surface of the PCB board, and each limiting plate is nested with the horizontal part of the corresponding L-shaped terminal block.

[0016] I. This utility model, by setting a male terminal and a female terminal, allows the female terminal to enter through the socket and connect with the male terminal inside the device during use, thus fixing the input and output cables; the wiring is convenient and it is plug-and-play.

[0017] II. By setting up an elastic sheet, a first latch, and a second latch, when the female terminal block is inserted into the socket, the first latch of the elastic sheet slides in contact with the lower end face of the female terminal block. When the second latch of the terminal block contacts the first latch of the elastic sheet, the second latch presses against the first latch, causing the elastic sheet to deform downwards and continue to push the female terminal block, so that the female terminal block is inserted into the male terminal block. At this time, the second latch is located to the left of the first latch, realizing the first latch engaging with the second latch and preventing the second latch from moving outwards when the input and output cables are pulled by external forces. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the right-side structure of this utility model;

[0020] Figure 3 This is a three-dimensional structural diagram of the backplate in this utility model;

[0021] Figure 4 This is a three-dimensional structural diagram of the through hole in the leftward sliding opening state of this utility model;

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the lower shell in this utility model;

[0023] Figure 6 This is a three-dimensional structural diagram of the PCB board in this utility model;

[0024] Figure 7 This is a front view schematic diagram of the compensation block structure in this utility model;

[0025] Figure 8 In this utility model Figure 7 Enlarged schematic diagram of the structure at point A in the diagram;

[0026] Figure 9 This is a three-dimensional structural diagram of the male connector of the wiring terminal in this utility model;

[0027] Figure 10 This is a three-dimensional structural diagram of the compensation block in this utility model;

[0028] Figure 11 This is a three-dimensional structural diagram of the elastic sheet in this utility model;

[0029] Figure 12 In this utility model Figure 11 Enlarged schematic diagram of the structure at point B in the diagram;

[0030] Figure 13 This is a three-dimensional structural diagram of the side plate in this utility model;

[0031] Figure 14 This is a three-dimensional structural diagram of the female terminal block in this utility model.

[0032] In the diagram: 1. Upper shell; 2. Lower shell; 3. Male terminal block; 4. Female terminal block; 5. PCB board; 6. Input / output cable; 7. Notch; 8. Elastic sheet; 9. First latch; 10. Second latch; 11. Through hole; 12. Compensation block; 13. Back plate; 14. First inclined surface; 15. Second inclined surface; 16. Slide groove; 17. Frame; 18. Side plate; 19. Plug hole; 20. Anti-foolproof protrusion; 21. Guide groove; 22. Limiting plate. Detailed Implementation

[0033] Please see Figure 1-14 The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0034] Existing home alarms include an upper shell 1 and a lower shell 2, which are fastened together, forming an internal space.

[0035] The cable fixing device for a household gas alarm described in this utility model includes male terminal blocks 3 and female terminal blocks 4. Several male terminal blocks 3 are fixedly mounted on a PCB board 5, which is located inside the upper shell 1 and the lower shell 2. The female terminal blocks 4 are fixedly mounted on the input and output cables 6. Notches 7 are provided at the positions corresponding to the male terminal blocks 3 in both the upper shell 1 and the lower shell 2, and the notches 7 in the upper shell 1 and the lower shell 2 together form a socket. In use, the female terminal block 4 enters through the socket and plugs into the male terminal blocks 3 in the internal space to fix the input and output cables 6. The wiring is convenient and can be used immediately after plugging in.

[0036] To increase the stability of the input / output cable 6 connection and prevent it from coming loose due to external pulling, in this embodiment, an elastic piece 8 corresponding to the male connector 3 of the terminal block is fixedly provided on the inner bottom wall of the lower shell 2. A first latch 9 is fixedly provided at the end of the elastic piece 8. A second latch 10 adapted to the first latch 9 is fixedly provided on the lower end face of the female connector 4. When the female connector 4 is inserted into the socket, the first latch 9 of the elastic piece 8 slides in contact with the lower end face of the female connector 4. When the second latch 10 of the terminal block contacts the first latch 9 of the elastic piece 8, the second latch 10 presses the first latch 9, causing the elastic piece 8 to deform downward and continue to push the female connector 4, so that the female connector 4 and the male connector 3 are inserted. The elastic piece 8 returns to its original position upward. At this time, the second latch 10 is located to the left of the first latch 9, realizing the first latch 9 locking the second latch 10 and preventing the second latch 10 from moving outward when the input / output cable 6 is pulled by external force.

[0037] In the above solution, the engagement of the first latch 9 and the second latch 10 relies solely on the elastic force of the elastic piece 8. When the input / output cable 6 is subjected to an external force greater than the elastic force of the elastic piece 8, the outward movement of the second latch 10 will force the first latch 9 and the elastic piece 8 to deform and move downward, thereby causing the female connector 4 of the input / output cable 6 to disengage from the male connector 3. To solve the above problem:

[0038] In this embodiment, a through hole 11 is provided on the inner bottom wall of the lower shell 2. The elastic sheet 8 is L-shaped. The bottom end of the vertical part of the elastic sheet 8 is fixedly installed with the inner bottom wall of the lower shell 2. The left side of the upper surface of the horizontal part of the elastic sheet 8 is fixedly installed with the first buckle 9. A compensation block 12 is fixedly installed on the lower surface of the horizontal part of the elastic sheet 8. The compensation block 12 extends downward into the through hole 11, and the lower surface of the compensation block 12 is flush with the lower surface of the lower shell 2. A back plate 13 is fixedly installed on the lower surface of the lower shell 2 by bolts. The lower surface of the compensation block 12 abuts against the inner side of the back plate 13.

[0039] After the female terminal 4 is fully inserted into the socket and fixed with the corresponding male terminal 3, the back plate 13 is then fixedly installed on the lower end face of the lower shell 2. At this time, the lower end face of the compensation block 12 of each elastic piece 8 is in contact with the inner side of the back plate 13. When the female terminal 4 is pulled outward, the female terminal 4 is compressed by the second buckle 10 to deform downward through the first buckle 9 and the elastic piece 8, thereby causing the compensation block 12 to move downward. However, the downward movement of the compensation block 12 is blocked by the back plate 13, so the female terminal 4 cannot be pulled out. This makes the connection between the female terminal 4 and the male terminal 3 more secure. When it is necessary to remove the female terminal 4, the back plate 13 must be removed first, and then the female terminal 4 can be pulled outward.

[0040] In this embodiment, the left and right sides of the first latch 9 and the second latch 10 are respectively set as a first inclined surface 14 and a second inclined surface 15. The first inclined surface 14 of the first latch 9 and the second inclined surface 15 of the second latch 10 are parallel, and the second inclined surface 15 of the first latch 9 and the first inclined surface 14 of the second latch 10 are parallel. The angle between the second inclined surface 15 of the first latch 9 and the vertical plane is greater than the angle between the first inclined surface 14 of the first latch 9 and the vertical plane. When the female terminal 4 is inserted from the socket, the first latch 9 of the elastic piece 8 slides in contact with the lower end face of the female terminal 4. When the second latch 10 of the terminal contacts the first latch 9 of the elastic piece 8, the first inclined surface 14 of the second latch 10 fits against the second inclined surface 15 of the first latch 9. Continuing to push the female terminal 4 forces the first latch 9 to move downward, thereby deforming the elastic piece 8 downward. Continuing to push the female terminal 4 causes the female terminal 4 to be inserted into the male terminal 3. At this time, the second latch 10 is located to the left of the first latch 9, and the first inclined surface 14 of the first latch 9 and the second inclined surface 15 of the second latch 10 fit together, thus achieving the latching of the first latch 9 onto the second latch 10.

[0041] In this embodiment, a groove 16 is provided on the lower end face of the lower shell 2, and the back plate 13 is slidably disposed in the groove 16 in the left and right direction. When the back plate 13 slides to the right side, it can be fixed to the lower shell 2 by bolts. When it is necessary to remove the female terminal 4, first remove the bolts fixing the back plate 13, and then slide the back plate 13 to the left to expose the compensation block 12. At this time, the female terminal 4 can be pulled out by pulling it outward. If there is difficulty, the corresponding compensation block 12 can be clamped and pulled down, so that the corresponding elastic piece 8 actively deforms downward, so that the first buckle 9 of the corresponding elastic piece 8 does not interfere with the outward movement of the second buckle 10, and the female terminal 4 can be pulled out more easily.

[0042] In this embodiment, a frame 17 is fixedly installed inside the notch 7 of the lower shell 2. After the upper shell 1 and the lower shell 2 are fixed, the frame 17 is located inside the insertion hole and contacts the inner sidewall of the notch 7 of the upper shell 1 and the lower shell 2. Two side plates 18 are fixedly installed on the PCB board 5 at the position corresponding to the male terminal 3 in the left-right direction. The two side plates 18 are located on the front and rear sides of the male terminal 3, and the right side of the two side plates 18 is connected to the frame 17 after the PCB board 5 is fixed inside the lower shell 2. When the female terminal 4 is inserted, the female terminal 4 enters from the frame 17 between the two side plates 18, and a channel for inserting the female terminal 4 is formed between the two side plates 18, so that the female terminal 4 can be more accurately connected to the male terminal 3, preventing the insertion path of the female terminal 4 from being skewed during use, which would cause the male terminal 3 to deform.

[0043] In this embodiment, the male terminal 3 is an inverted L-shaped terminal. The vertical part of the L-shaped terminal is fixedly installed with the PCB board 5 and electrically connected to the PCB board 5. The end face of the female terminal 4 is provided with a plug hole 19. When in use, when the female terminal 4 is inserted, the horizontal part of the L-shaped terminal is inserted into the plug hole 19 of the female terminal 4, so as to realize the electrical connection between the L-shaped terminal and the female terminal 4.

[0044] In this embodiment, each frame 17 has a foolproof protrusion 20 on its inner top wall, and each terminal female 4 has a guide groove 21 corresponding to the corresponding foolproof protrusion 20 on its upper surface. The foolproof protrusion 20 of each frame 17 is different from the foolproof protrusions 20 on the other frames 17 in the front-back direction. In use, the terminal female 4 is inserted into the frame 17. If it can be inserted smoothly, it means that the terminal female 4 is inserted into the correct frame 17. If it cannot be inserted, it means that the terminal female 4 is inserted into the wrong frame 17. This prevents wiring errors.

[0045] To prevent the vertical part of the L-shaped terminal block from being stressed at the solder joint of the PCB board 5 when the female terminal block 4 and the male terminal block 3 are plugged in, which could lead to the male terminal block 3 desoldering or even falling off over time, in this embodiment, several limiting plates 22 are fixedly provided on the upper surface of the PCB board 5. Each limiting plate 22 is interlocked with the horizontal part of the corresponding L-shaped terminal block. In use, the female terminal block 4 is pushed inward to the position where it contacts the limiting plate 22, indicating that the female terminal block 4 is plugged in. At this time, the limiting plate 22 is pushed, preventing the vertical part of the L-shaped terminal block from being directly stressed.

[0046] In this embodiment, the female terminal 4 is made of plastic and has a set length, which can effectively prevent electric shock and reduce the risk of electric shock to users during operation.

[0047] The working principle of this utility model is as follows: When wiring, the female connector 4 of the input / output cable 6 is inserted into the corresponding frame 17. Successful insertion indicates correct insertion into the frame 17. The first latch 9 of the elastic piece 8 slides in contact with the lower end face of the female connector 4. When the second latch 10 of the connector contacts the first latch 9 of the elastic piece 8, the first inclined surface 14 of the second latch 10 abuts against the second inclined surface 15 of the first latch 9. Continuing to push the female connector 4 forces the first latch 9 downwards, causing the elastic piece 8 to deform downwards. Continuing to push the female connector 4 allows it to connect with the male connector 3. The second latch 10 is located to the left of the first latch 9, and the first inclined surface 14 of the first latch 9 and the second inclined surface 15 of the second latch 10 are in contact with each other, so that the first latch 9 engages with the second latch 10. Then, the back plate 13 is slid so that the back plate 13 seals the through hole 11. At the same time, the lower end face of the compensation block 12 of each elastic piece 8 is in contact with the inner side of the back plate 13 to prevent the elastic piece 8 from deforming downward. Then, the back plate 13 is fixed to the lower shell 2 by bolts. When disassembling the terminal female head 4, the bolts need to be removed, and then the back plate 13 is slid to the left so that the compensation block 12 in the through hole 11 is exposed. Then the terminal female head 4 can be pulled out.

Claims

1. A cable fixing device for domestic gas alarms, comprising a terminal male (3) and a terminal female (4), characterized in that: Several male terminal blocks (3) are fixedly mounted on the PCB board (5), which is located inside the upper shell (1) and the lower shell (2). Female terminal blocks (4) are fixedly mounted on the input and output cables (6). The upper shell (1) and the lower shell (2) are provided with notches (7) at the positions corresponding to the male terminal blocks (3). The notches (7) of the upper shell (1) and the lower shell (2) together form a socket. The female terminal block (4) is plugged into the male terminal block (3).

2. A cable securing device for a domestic gas alarm according to claim 1, characterised in that: The lower shell (2) is fixedly provided with an elastic piece (8) corresponding to the male connector (3) of the wiring terminal, and a first buckle (9) is fixedly provided at the end of the elastic piece (8); a second buckle (10) adapted to the first buckle (9) is fixedly provided on the lower end face of the female connector (4).

3. A cable securing device for a domestic gas alarm according to claim 2, characterised in that: The lower shell (2) has a through hole (11) on its inner bottom wall. The elastic sheet (8) is L-shaped. The bottom end of the vertical part of the elastic sheet (8) is fixed to the inner bottom wall of the lower shell (2). The left side of the upper end face of the horizontal part of the elastic sheet (8) is fixed to the first buckle (9). The lower end face of the horizontal part of the elastic sheet (8) is fixedly provided with a compensation block (12). The compensation block (12) extends downward into the through hole (11). The lower end face of the lower shell (2) is fixedly provided with a back plate (13) by bolts. The lower end face of the compensation block (12) abuts against the inner side of the back plate (13).

4. The cable securing device for a domestic gas alarm of claim 2, wherein: The left and right sides of the first buckle (9) and the second buckle (10) are respectively set as a first inclined surface (14) and a second inclined surface (15). The first inclined surface (14) of the first buckle (9) and the second inclined surface (15) of the second buckle (10) are parallel. The second inclined surface (15) of the first buckle (9) and the first inclined surface (14) of the second buckle (10) are parallel. The angle between the second inclined surface (15) of the first buckle (9) and the vertical plane is greater than the angle between the first inclined surface (14) of the first buckle (9) and the vertical plane.

5. The cable securing device for a domestic gas alarm of claim 3, wherein: The lower end face of the lower shell (2) is provided with a sliding groove (16), and the back plate (13) is slidably disposed in the sliding groove (16) in the left and right direction. When the back plate (13) slides to the right side, it can be fixed to the lower shell (2) by bolts.

6. The cable securing device for a domestic gas alarm of claim 1, wherein: A frame (17) is fixedly installed inside the notch (7) of the lower shell (2). After the upper shell (1) and the lower shell (2) are fixed, the frame (17) is located inside the socket and is in contact with the inner sidewall of the notch (7) of the upper shell (1) and the lower shell (2). Two side plates (18) are fixedly installed on the PCB board (5) at the position corresponding to the male terminal (3) along the left and right direction. The two side plates (18) are located on the front and rear sides of the male terminal (3), and the right side of the two side plates (18) are connected to the frame (17) after the PCB board (5) is fixed inside the lower shell (2).

7. The cable securing device for a domestic gas alarm of claim 1, wherein: The male terminal (3) is an inverted L-shaped terminal. The vertical part of the L-shaped terminal is fixedly installed on the PCB board (5) and electrically connected to the PCB board (5). The female terminal (4) has a plug hole (19) on its end face.

8. The cable securing device for a domestic gas alarm of claim 6, wherein: An anti-fumble protrusion (20) is arranged at the inner top wall of each frame body (17), and the upper end face of each terminal female head (4) is provided with a guide slot (21) corresponding to the anti-fumble protrusion (20).

9. The cable securing device for a domestic gas alarm of claim 7, wherein: The upper end face of the PCB (5) is fixedly provided with a plurality of limiting plates (22), and each limiting plate (22) is sleeved with the horizontal part of the corresponding L-shaped terminal post.

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