Protection device of low-voltage surge protection device

Abstract

The utility model belongs to the technical field of protection devices, and particularly relates to a low-voltage surge protection device protection device, which comprises a shell, a gas discharge tube and an air switch coil are arranged in the shell, a lead of the air switch coil is welded with the end part of the gas discharge tube, and a handle is rotatably connected in the shell. A moving contact is rotatably connected to the interior of the shell, a connecting rod is fixedly connected between the moving contact and the handle, a moving contact is welded to the bottom of the moving contact, a static contact is welded to the tail end of the gas discharge tube, and the moving contact and the static contact are both made of tungsten steel. According to the utility model, the gas discharge tube adopts a unified electrode, so that gas discharge bare tubes with different diameters and sizes can be installed, the applicability is better, and meanwhile, the movable contact and the static contact in the protection device are made of tungsten steel and are more durable than the movable contact and a gas discharge tube copper electrode, thereby prolonging the service life of the product.

Description

Technical Field

[0001] The utility model relates to the field of protection devices, in particular to a protection device for a low-voltage surge protector. Background Art

[0002] A special protection device for a low-voltage surge protector can be used to protect the low-voltage surge protector from overvoltage damage. For example, the utility model patent with the publication number CN212231085U discloses a special protection device for a low-voltage surge protector, which includes a main housing. A left connector and a right connector are respectively arranged on the left side and the right side of the main housing. It also includes a shunt excitation housing. A handle, a tripping mechanism, an electrode plate, a coil assembly and an arc extinguishing assembly corresponding to the structure and position of the main housing are arranged on the shunt excitation housing. And installation grooves for installing various components are arranged on the shunt excitation housing. The shunt excitation housing is fixedly connected to the main housing by snap connection. The handle and the tripping mechanism are respectively assembled in linkage with the corresponding structures of the main housing. An arc-shaped cutting groove for a wire to pass through is arranged at the outer edge of the shunt excitation housing. A lead support plate passing through the arc-shaped cutting groove is arranged on the main housing. A slotted opening for a wire to pass through and be connected to the right connector is arranged at the end of the lead support plate. This device has optimized structure, reasonable space layout, and effective and stable use. By designing the sub-housing and reserving the wiring structure, the use requirements are met.

[0003] However, the gas discharge tubes used in existing low-voltage surge protector protection devices are selected according to different models, with poor applicability. Moreover, the moving contacts and gas discharge tubes generally use copper electrodes, resulting in poor durability. Therefore, improvement is needed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a protection device for a low-voltage surge protector, which solves the problem of poor applicability caused by the selection of gas discharge tubes according to different models in existing protection devices. At the same time, it solves the problem of poor durability caused by generally using copper electrodes for moving contacts and gas discharge tubes.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A protection device for a low-voltage surge protector, including a housing. A gas discharge tube and an air switch coil are arranged inside the housing. And the lead of the air switch coil is welded to the end of the gas discharge tube. A handle is rotatably connected inside the housing. A moving contact is rotatably connected inside the housing. A connecting rod is fixedly connected between the moving contact and the handle. A moving contact point is welded to the bottom of the moving contact. A static contact point is welded to the end of the gas discharge tube. Both the moving contact point and the static contact point are made of tungsten steel. An arc extinguishing chamber is arranged inside the housing and below the moving contact point and the static contact point. A locking block is fixedly connected inside the housing. A locking screw is threadedly connected to the inside of the locking block. The locking screw penetrates the housing and is slidably connected to the housing.

[0006] Preferably, a first torsion spring is provided at the rotating shaft of the handle. Through the arrangement of the first torsion spring, it has an auxiliary reset function for the handle.

[0007] Preferably, a second torsion spring is provided at the rotating shaft of the moving contact. Through the arrangement of the second torsion spring, it has an auxiliary reset function for the moving contact.

[0008] Preferably, a contact connecting member is fixedly connected inside the housing and on the right side of the moving contact. Through the arrangement of the contact connecting member, the connection between the moving contact and the electrode can be achieved.

[0009] Preferably, a fixing rod is fixedly connected to the inner bottom of the locking block. The fixing rod is inserted into the locking screw. A retaining pin is slidably connected inside the fixing rod. The retaining pin is engaged with the locking screw. A spring is provided inside the fixing rod. Through the arrangement of the retaining pin, it has a certain anti-loosening effect on the installation between the locking screw and the locking block.

[0010] Preferably, one end of the spring is fixedly connected to the retaining pin, and the other end of the spring is fixedly connected to the inner surface of the fixing rod. Through the arrangement of the spring, the elastic force can act on the retaining pin.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] In the present utility model, by using a unified electrode for the gas discharge tube, gas discharge bare tubes with different diameters and sizes can be installed, and the applicability is better. At the same time, the moving contact and the static contact in the protection device are both made of tungsten steel, which is more durable than the moving contact and the copper electrode of the gas discharge tube, thereby extending the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the front view of the present utility model;

[0014] Figure 2 is the top view of the present utility model;

[0015] Figure 3 is the Figure 1 front elevation sectional view of the present utility model;

[0016] Figure 4 is the Figure 3 enlarged view of the structure of part A of the present utility model.

[0017] In the figure: 1, housing; 2, gas discharge tube; 3, air switch coil; 4, connecting rod; 5, arc extinguishing chamber; 6, locking block; 7, locking screw; 8, handle; 9, first torsion spring; 10, moving contact; 11, second torsion spring; 12, contact connecting member; 13, moving contact point; 14, static contact point; 61, fixing rod; 62, retaining pin; 63, spring. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0019] Please refer to Figures 1-3 , a low-voltage surge protector protection device, including a housing 1. Inside the housing 1, a gas discharge tube 2 and an air switch coil 3 are arranged. The lead wire of the air switch coil 3 is welded to the end of the gas discharge tube 2. A handle 8 is rotatably connected inside the housing 1. A moving contact 10 is rotatably connected inside the housing 1. A connecting rod 4 is fixedly connected between the moving contact 10 and the handle 8. A moving contact point 13 is welded to the bottom of the moving contact 10. A static contact point 14 is welded to the end of the gas discharge tube 2. Both the moving contact point 13 and the static contact point 14 are made of tungsten steel. An arc extinguishing chamber 5 is arranged inside the housing 1 and below the moving contact point 13 and the static contact point 14. A locking block 6 is fixedly connected inside the housing 1. A locking screw 7 is connected to the inside of the locking block 6 by threads. The locking screw 7 penetrates through the housing 1 and is slidably connected to the housing 1.

[0020] Please refer to Figures 1-3 , a torsion spring 9 is arranged at the rotating shaft of the handle 8. Through the setting of the torsion spring 9, it has an auxiliary resetting effect on the handle 8. A torsion spring 11 is arranged at the rotating shaft of the moving contact 10. Through the setting of the torsion spring 11, it has an auxiliary resetting effect on the moving contact 10. A contact connecting piece 12 is fixedly connected inside the housing 1 and on the right side of the moving contact point 13. Through the setting of the contact connecting piece 12, the connection between the moving contact 10 and the electrode can be realized.

[0021] Please refer to Figures 3-4 , a fixing rod 61 is fixedly connected to the inner bottom of the locking block 6. The fixing rod 61 is inserted into the locking screw 7. A pin 62 is slidably connected inside the fixing rod 61. The pin 62 is clamped with the locking screw 7. A spring 63 is arranged inside the fixing rod 61. Through the setting of the pin 62, it has a certain anti-loosening effect on the installation between the locking screw 7 and the locking block 6. One end of the spring 63 is fixedly connected to the pin 62, and the other end of the spring 63 is fixedly connected to the inner surface of the fixing rod 61. Through the setting of the spring 63, the elastic force can act on the pin 62.

[0022] The specific implementation process of the present utility model is as follows: First, the gas discharge tube 2 is fixed on the housing 1. Then, the leads at both ends of the air switch coil 3 are respectively welded to both ends of the gas discharge tube 2, thus forming a combined channel for power frequency and surge. The handle 8 and the housing 1 are elastically connected through the first torsion spring 9, and the moving contact 10 and the housing 1 are elastically connected through the second torsion spring 11. Then, the installed handle 8 and the moving contact 10 are fixedly connected through the connecting rod 4. Moreover, a moving contact 13 and a static contact 14 are respectively welded on the moving contact 10 and the gas discharge tube 2. The moving contact 10 is connected to the electrode through the contact connecting piece 12. In addition, the arc extinguishing chamber 5 is installed at the contact position of the moving contact 13 and the static contact 14. The locking block 6 and the locking screw 7 are fixed on the housing 1, and one end is inserted into the electrode of the gas discharge tube 2 and the other end is inserted into the electrode of the moving contact 10. Moreover, after the locking block 6 and the locking screw 7 are connected, the latch 62 on the fixing rod 61 will be engaged with the locking screw 7 under the action of the spring 63, thereby preventing loosening between the locking block 6 and the locking screw 7.

[0023] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A low-voltage surge protector protection device, comprising a housing (1), characterized in that: Inside the housing (1), a gas discharge tube (2) and an air switch coil (3) are provided, and the lead wire of the air switch coil (3) is welded to the end of the gas discharge tube (2). A handle (8) is rotatably connected inside the housing (1), and a moving contact (10) is rotatably connected inside the housing (1). A connecting rod (4) is fixedly connected between the moving contact (10) and the handle (8). A moving contact point (13) is welded to the bottom of the moving contact (10), and a static contact point (14) is welded to the end of the gas discharge tube (2). Both the moving contact point (13) and the static contact point (14) are made of tungsten steel. An arc extinguishing chamber (5) is provided inside the housing (1) and below the moving contact point (13) and the static contact point (14). A locking block (6) is fixedly connected inside the housing (1), and a locking screw (7) is connected to the inside of the locking block (6) by thread. The locking screw (7) penetrates the housing (1) and is slidably connected to the housing (1).

2. A low-voltage surge protector protection device according to claim 1, characterized in that: A first torsion spring (9) is provided at the rotating shaft of the handle (8).

3. A low-voltage surge protector protection device according to claim 1, characterized in that: A second torsion spring (11) is provided at the rotating shaft of the moving contact (10).

4. A low-voltage surge protector protection device according to claim 1, characterized in that: A contact connecting part (12) is fixedly connected inside the housing (1) and on the right side of the moving contact point (13).

5. A low-voltage surge protector protection device according to claim 1, characterized in that: A fixing rod (61) is fixedly connected to the inner bottom of the locking block (6). The fixing rod (61) is inserted into the locking screw (7). A pin (62) is slidably connected inside the fixing rod (61). The pin (62) is engaged with the locking screw (7). A spring (63) is provided inside the fixing rod (61).

6. The protection device of a low-voltage surge protector according to claim 5, characterized in that: One end of the spring (63) is fixedly connected to the pin (62), and the other end of the spring (63) is fixedly connected to the inner surface of the fixing rod (61).

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