A flashlight

Abstract

The utility model relates to lighting equipment technical field, especially a flashlight, including the barrel body, the lamp holder and the tail cover, the barrel body includes the conductive inner tube and the protective outer tube, makes the positive contact end of battery, control circuit, the conductive inner tube and the negative contact end of battery form the loop, still be provided with the insulating cylinder between the conductive inner tube and the protective outer tube, the outer wall of the front end of conductive inner tube has the first limit ring, the end face of the front end of insulating cylinder with first limit ring abuts and touches, the outer wall of insulating cylinder front end has the second limit ring, the inner wall of protective outer tube has the limit step, the limit step with second limit ring abuts and touches, the utility model discloses the conductive function is realized to the conductive inner tube, and utilizes insulating structure to separate the conductive inner tube and the protective outer tube, the protective outer tube and the lamp holder, tail cover and other components are not electrified in the use process, avoid the electrochemical corrosion of the barrel body and the occurrence of electrolysis side reaction.

Description

Technical Field

[0001] This utility model relates to the field of lighting equipment technology, and in particular to a flashlight. Background Technology

[0002] Existing flashlights are basically made of aluminum alloy shells. The flashlight head contains a circuit board, which connects and controls the light-emitting element. A battery is installed inside the flashlight body. The positive terminal of the battery is directly connected to the conductive part on the back of the circuit board. The negative terminal of the battery is connected to the circuit board through the aluminum alloy shell, thus forming a circuit.

[0003] However, when using diving flashlights underwater, in addition to good sealing, the flashlights must also be resistant to seawater corrosion. Although the aluminum alloy casing has a certain degree of corrosion resistance after surface treatments such as anodizing, when the diving flashlight is used in seawater, seawater is a natural electrolyte containing a large amount of sodium. + Cl - Mg 2+ Ca 2+ Plasma has very high electrical conductivity. Once the aluminum alloy casing of a flashlight becomes charged in seawater, it forms an electrochemical corrosion cell structure. When this cell comes into contact with other metal parts of the flashlight (such as copper, stainless steel screws, springs, etc.), a tiny potential difference is created, causing the aluminum alloy casing to act as the anode and be subject to sacrificial corrosion (anodic dissolution), gradually being worn down and affecting its mechanical strength and conductivity. Furthermore, the continuous flow of direct current on the aluminum surface causes electrolytic side reactions (trace amounts of hydrogen bubbles are released from the aluminum alloy surface), resulting in bubbles or condensation on the flashlight lens, and even causing localized changes in the electric field, potentially leading to arcing or damage to electronic components.

[0004] Currently, some diving flashlights use titanium alloy as the conductive shell. Although this can improve the flashlight's corrosion resistance in seawater, it still creates a potential difference with other metal parts. Moreover, titanium alloy is expensive and difficult to process.

[0005] Furthermore, most diving flashlights currently used underwater employ O-ring seals, especially in non-permanently sealed areas such as the tail cap, which requires frequent unscrewing for battery changes. Seawater contains highly permeable gases such as hydrogen, helium, carbon dioxide, water vapor, and oxygen, which, under water pressure, can easily pass through the O-rings and enter the flashlight, causing hazards such as optical interference, electrical failure, structural damage, corrosion, and even safety risks. While using O-rings made of perfluoroelastomer (PFO) would address this issue to some extent, PFOs are expensive and have high manufacturing costs. Utility Model Content

[0006] This invention overcomes the above-mentioned shortcomings and provides a flashlight with a simple structure, long service life, and suitability for use in diving environments.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: a flashlight includes a body, a lamp head at the front end of the body, a tail cap at the rear end of the body, a battery compartment inside the body, a positive battery contact terminal and a negative battery contact terminal at the front and rear ends of the battery compartment, respectively, a control circuit inside the body, lamp head or tail cap, the body including a conductive inner tube and a protective outer tube, the conductive inner tube being electrically connected to the control circuit, forming a circuit between the positive battery contact terminal, the control circuit, the conductive inner tube and the negative battery contact terminal, and an insulating structure between the conductive inner tube and the protective outer tube. The lamp head and the tail cap are respectively installed and fixed to the protective outer cylinder; the insulating structure may be an insulating cylinder disposed between the protective outer cylinder and the conductive inner cylinder, or the insulating structure may be an insulating coating attached to the outer wall of the conductive inner cylinder or the inner wall of the protective outer cylinder; an annular gasket may be provided between the end face of the rear end of the protective outer cylinder and the tail cap; the outer wall of the front end of the conductive inner cylinder may have a first limiting ring, and the end face of the front end of the insulating cylinder abuts against the first limiting ring; the outer wall of the front end of the insulating cylinder may have a second limiting ring, and the inner wall of the protective outer cylinder has a limiting step, and the limiting step abuts against the second limiting ring.

[0008] Furthermore, the insulating cylinder and the protective outer cylinder can be installed with an interference fit, and the conductive inner cylinder and the insulating cylinder can be installed with a clearance fit.

[0009] A flashlight includes a body, a lamp head at the front end, a tail cap at the rear end, and a battery compartment inside the body. The front and rear ends of the battery compartment have a positive battery contact and a negative battery contact, respectively. A control circuit is located within the body, lamp head, or tail cap. The body includes a conductive inner tube and an insulating outer tube. The conductive inner tube is electrically connected to the control circuit, forming a circuit between the positive battery contact, the control circuit, the conductive inner tube, and the negative battery contact. The lamp head and the tail cap are respectively mounted and fixed to the insulating outer tube. An annular gasket may be provided between the rear end face of the insulating outer tube and the tail cap. A limiting ring may be provided on the outer wall of the front end of the conductive inner tube, and a limiting step may be provided on the inner wall of the insulating outer tube, with the limiting ring abutting against the limiting step.

[0010] Furthermore, the conductive inner cylinder and the insulating outer cylinder can be installed using a clearance fit method.

[0011] This invention achieves conductivity through the conductive inner cylinder and isolates it from the protective outer cylinder using an insulating structure. The protective outer cylinder, lamp head, tail cap, and other components are not energized during use. Alternatively, the design utilizes a conductive inner cylinder and an insulating outer cylinder, thus preventing electrochemical corrosion and electrolytic side reactions of the flashlight body. It is particularly suitable for underwater lighting in seawater, significantly extending the flashlight's lifespan. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of the present utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the middle cylinder;

[0014] Figure 3 This is a schematic diagram of the cylinder body in Embodiment 2 of this utility model. Detailed Implementation

[0015] Example 1:

[0016] like Figure 1 The diagram shown is a cross-sectional view of Embodiment 1 of this utility model, including a cylindrical body 1, a lamp head 2, and a tail cap 3. The cylindrical body 1 is mainly used to house the battery, and it has a battery compartment 11 inside. The front end and rear end of the battery compartment 11 have a positive terminal contact and a negative terminal contact, respectively. The lamp head 2 is installed at the front end of the cylindrical body 1, and the tail cap 3 is installed at the rear end of the cylindrical body 1. The lamp head 2 is equipped with a light source assembly 22, optical components, lenses, etc. (not shown in the figure). A switch 21 is provided on the outer wall of the lamp head 2. The tail cap 3 is provided with a second conductive spring 31, which serves as the negative terminal contact of the battery, for fixing the battery in the battery compartment 11 and connecting the negative terminal of the battery. The cylindrical body 1, lamp head 2, or tail cap 3 has an internal control circuit. The control circuit is used to receive the control signal sent by the switch 21. The control circuit is turned on and off, thereby controlling the light source assembly to connect the battery and realize light emission. In this preferred embodiment, a circuit board 4 is fixed at the connection between the rear end of the lamp head 2 and the cylinder body 1, and the control circuit is arranged on the circuit board 4.

[0017] like Figure 2 As shown, Figure 1The schematic diagram of the middle cylinder body shows that the cylinder body 1 includes a conductive inner cylinder 12, a protective outer cylinder 13, and an insulating cylinder 14. The conductive inner cylinder 12 is made of a metal conductor material, with its front end electrically connected to the control circuit on the circuit board 4 and its rear end electrically connected to the second conductive spring 31 inside the tail cap 3. Since the circuit board 4 is also provided with a battery positive terminal contact terminal, i.e., a first conductive spring 41, the first conductive spring 41 (or a conductive sheet, etc.) is connected to the battery positive terminal, making the conductive inner cylinder 12 a conductor, forming a circuit connecting the first conductive spring 41, the control circuit, the conductive inner cylinder 12, the second conductive spring 31, and the battery in the battery compartment 11. The control circuit can be designed and implemented by those skilled in the art according to actual needs, and will not be described in detail here. In addition, the switch 21 can also be set on the tail cap according to operational needs, and the circuit board 4 can also be set in any position, such as inside the tail cap, inside the lamp head, or inside the switch, according to actual needs.

[0018] In this preferred embodiment, a first voltage-conducting coil 5 and a first compression spring 6 are sequentially installed on the front end face of the conductive inner cylinder 12. The first compression spring 6 is electrically connected to the circuit board 4. Through the conduction of the first voltage-conducting coil 5 and the first compression spring 6, the front end of the conductive inner cylinder 12 sequentially passes through the first voltage-conducting coil 5 and the first compression spring 6 and is electrically connected to the control circuit on the circuit board 4. A conductive plate 33 is fixed inside the tail cap 3. The negative terminal contact end of the battery is a second conductive spring 31, which is fixed on the conductive plate 33. A second voltage-conducting coil 7 and a second compression spring 8 are also sequentially installed on the rear end face of the conductive inner cylinder 12. The second compression spring 8 is electrically connected to the second conductive spring 31. Through the conduction of the second voltage-conducting coil 7 and the second compression spring 8, the conductive inner cylinder 12 sequentially passes through the second voltage-conducting coil 7, the second compression spring 8, the conductive plate 33, and is electrically connected to the second conductive spring 31. Furthermore, the tension of the first compression spring 6 and the second compression spring 8 ensures good electrical conductivity between the conductive inner cylinder 12 and the control circuit and the second conductive spring 31, thereby ensuring the normal transmission of electrical signals and the normal operation of the entire circuit.

[0019] The outer walls of the front and rear ends of the protective outer cylinder 13 are both threaded with structures 131 and 132, respectively. The lamp head 1 and tail cap 3 are fixed in place by corresponding threaded structures in the lamp head 1 and tail cap 3. Simultaneously, several O-rings are provided between the inner wall of the rear end of the lamp head 2 and the outer wall of the front end of the protective outer cylinder 13, and several O-rings are also provided between the inner wall of the tail cap 3 and the outer wall of the rear end of the protective outer cylinder 13. After the cylinder 2 is fixed to the lamp head 1 and tail cap 3, the O-rings 10 provide a seal, preventing water and sediment from seeping into the flashlight during diving.

[0020] Due to the need for battery replacement, the tail cap 3 requires frequent disassembly and reassembly, inevitably causing some wear and tear on the O-ring seal 10 at the tail cap, thus affecting its lifespan. Therefore, an annular protrusion 32 is also provided on the inner wall of the tail cap 3, and an annular gasket 9 is also provided between the end face of the rear end of the protective outer cylinder 13 and the annular protrusion 32 inside the tail cap 3. When the tail cap 3 is installed at the rear end of the cylinder body 1, the annular protrusion 32 on the tail cap 3 and the rear end of the protective outer cylinder 13 squeeze the annular gasket 9 to further achieve a sealing effect, ensuring good sealing and waterproof performance inside the battery compartment 11.

[0021] Combination Figure 1 , Figure 2 It is understood that the insulating cylinder 14 is disposed between the conductive inner cylinder 12 and the protective outer cylinder 13. The outer wall of the front end of the conductive inner cylinder 12 has a first limiting ring 121, and the end face of the front end of the insulating cylinder 14 abuts against the first limiting ring 121, thus limiting the position of the insulating cylinder 14. The outer wall of the front end of the insulating cylinder 14 has a second limiting ring 141, and the inner wall of the protective outer cylinder 13 has a limiting step 131, which abuts against the second limiting ring 141, positioning the insulating cylinder 14 within the protective outer cylinder 13.

[0022] During assembly, the conductive inner cylinder 12 is inserted into the inner cavity of the insulating cylinder 14 from top to bottom. Then, the insulating cylinder 14 is inserted into the inner cavity of the protective outer cylinder 13 from top to bottom. The outer diameter of the insulating cylinder 14 and the protective outer cylinder 13 can be installed using an interference fit. Because the non-metallic material used for the insulating cylinder 14 usually has a certain tension, it can be firmly fixed to the inner wall of the protective outer cylinder 13 and will not move up and down. At the same time, through the limiting action of the first limiting ring 121 and the limiting step 131, the conductive inner cylinder 12 and the insulating cylinder 14 will not fall off to the rear end when the tail cap is removed. The conductive inner cylinder 12 and the insulating cylinder 14 are installed using a clearance fit. The conductive inner cylinder 12 can move up and down slightly within the inner cavity of the insulating cylinder 14. When the flashlight is in a relatively harsh operating environment, even with severe vibration, the conductive inner cylinder 12 will still maintain the continuity of the circuit under the combined action of the first compression spring 6 and the second compression spring 8, and no circuit break will occur.

[0023] In a preferred embodiment of this invention, the protective outer cylinder 13 can be made of metal. The conductive inner cylinder 12 provides conductivity, and the insulating cylinder 14 isolates the conductive inner cylinder 12 from the protective outer cylinder 13. The protective outer cylinder 13 remains non-conductive during use, ensuring good mechanical strength for both the protective outer cylinder 13 and the entire cylinder body 1, while preventing electrochemical corrosion and electrolytic side reactions. Alternatively, the protective outer cylinder 13 can be made of a wear-resistant, high-mechanical-strength non-metallic material, providing excellent protection for the internal structure and components.

[0024] As a simplification of this embodiment, the insulating cylinder 14 can be replaced by an insulating coating. That is, by attaching an insulating coating to the outer wall of the conductive inner cylinder or the inner wall of the protective outer cylinder, an insulating structure is formed, which serves to isolate the conductive inner cylinder 12 and the protective outer cylinder 13. At the same time, it ensures that components such as the lamp head and tail cap are also isolated from the conductive inner cylinder, avoiding electrochemical corrosion and electrolytic side reactions of other components.

[0025] Example 2:

[0026] The structure of Embodiment 2 is largely similar to that of Embodiment 1, the only difference being that the cylinder body includes a conductive inner cylinder and an insulating outer cylinder.

[0027] like Figure 3 The diagram shows a schematic representation of the cylinder body in Embodiment 2. The cylinder body includes a conductive inner cylinder 12' and an insulating outer cylinder 13'. The conductive inner cylinder 12' is electrically connected to the control circuit, forming a circuit between the positive terminal of the battery, the control circuit, the conductive inner cylinder, and the negative terminal of the battery. The lamp head and the tail cap are respectively mounted and fixed to the insulating outer cylinder 13'. The insulating outer cylinder 13' is made of a wear-resistant, high-mechanical-strength non-metallic material, and an annular gasket (not shown in the diagram) is provided between the rear end face of the insulating outer cylinder and the tail cap.

[0028] The conductive inner cylinder 12' has a limiting ring 121' on its outer wall at the front end, and the insulating outer cylinder 13' has a limiting step 131' on its inner wall. The limiting ring 121' abuts against the limiting step 131'. The conductive inner cylinder and the insulating outer cylinder are installed with a clearance fit.

[0029] In this second embodiment, the insulating outer cylinder provides sealing and protection. At the same time, the insulating outer cylinder is not charged, so there will be no electrochemical corrosion or electrolytic side reactions, which fundamentally solves the problem of the service life of diving flashlights.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments 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 indication will also change accordingly. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0031] The flashlight provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A flashlight, comprising a body, a lamp head at the front end of the body, a tail cap at the rear end of the body, a battery compartment inside the body, a positive battery contact terminal and a negative battery contact terminal at the front and rear ends of the battery compartment, respectively, and a control circuit within the body, lamp head, or tail cap, characterized in that: The cylinder body includes a conductive inner cylinder and a protective outer cylinder. The conductive inner cylinder is electrically connected to the control circuit, forming a circuit between the positive terminal of the battery, the control circuit, the conductive inner cylinder, and the negative terminal of the battery. An insulating structure is also provided between the conductive inner cylinder and the protective outer cylinder. The lamp head and the tail cap are respectively installed and fixed to the protective outer cylinder. The insulating structure is an insulating cylinder disposed between the protective outer cylinder and the conductive inner cylinder. An annular gasket is provided between the end face of the rear end of the protective outer cylinder and the tail cap. A first limiting ring is provided on the outer wall of the front end of the conductive inner cylinder, and the end face of the front end of the insulating cylinder abuts against the first limiting ring. A second limiting ring is provided on the outer wall of the front end of the insulating cylinder, and a limiting step is provided on the inner wall of the protective outer cylinder, and the limiting step abuts against the second limiting ring.

2. The flashlight according to claim 1, characterized in that: The insulating cylinder and the protective outer cylinder are installed with an interference fit, while the conductive inner cylinder and the insulating cylinder are installed with a clearance fit.

3. A flashlight, comprising a body, a lamp head at the front end of the body, a tail cap at the rear end of the body, a battery compartment inside the body, a positive battery contact terminal and a negative battery contact terminal at the front and rear ends of the battery compartment, respectively, and a control circuit within the body, lamp head, or tail cap, characterized in that: The cylinder body includes a conductive inner cylinder and an insulating outer cylinder. The conductive inner cylinder is electrically connected to the control circuit, forming a circuit between the positive terminal of the battery, the control circuit, the conductive inner cylinder, and the negative terminal of the battery. The lamp head and the tail cap are respectively installed and fixed to the insulating outer cylinder. An annular gasket is provided between the end face of the rear end of the insulating outer cylinder and the tail cap. A limiting ring is provided on the outer wall of the front end of the conductive inner cylinder, and a limiting step is provided on the inner wall of the insulating outer cylinder. The limiting ring abuts against the limiting step.

4. The flashlight according to claim 3, characterized in that: The conductive inner cylinder and the insulating outer cylinder are installed with a clearance fit.

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