Explosion-proof lamp with high sealing performance
Through the step-like design of the edge of the translucent plate and the sealant filling, the problem of weak sealing of the joint surface of the translucent plate and the shell is solved, and high sealing and cost-effectiveness are improved.
Patent Information
- Application Number
- CN202422510831.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-16
AI Technical Summary
The sealing properties of the light-transmissive plate and the housing surface of the existing explosion-proof lamps are weak, resulting in the light-transmissive plate being easily fractured, and a large preload force is required to maintain the seal, increasing cost and weight.
The edge step-like design of the translucent plate is adopted. The middle part of the translucent plate is snapped into the installation groove. The edge step surface is fitted with the rear shell boss. The gap is filled with sealant, and a baffle is installed on the outside of the translucent plate to reduce the need for preload.
It achieves a high sealing effect, while reducing the preload demand for light-transmitting plates, reducing material usage and weight, and reducing costs.
Smart Images
Figure CN223137684U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of explosion-proof lighting equipment, and particularly relates to a high-sealing explosion-proof lamp. Background Art
[0002] An explosion-proof lamp is a special lighting device, which is often used in environments with flammable and explosive gases, such as chemical plants or flour mills.
[0003] When a general lighting lamp conducts power-on and power-off operations, electrical components inside will generate electric sparks, which are likely to detonate the surrounding combustible gases. Generally, the electrical components and the power-on components of the light-emitting elements in the lamp body of the explosion-proof lamp are sealed. Even if electric sparks are generated by the internal electrical components and light-emitting elements, they are sealed inside the explosion-proof lamp and will not ignite or detonate the air outside the lamp.
[0004] In order to let the light of the light-emitting element inside the explosion-proof lamp penetrate, an opening is made on the housing of the explosion-proof lamp body, and then it is covered with a transparent light-transmitting plate.
[0005] The outer housing of the explosion-proof lamp is generally made of metal materials such as cast aluminum, and the light-transmitting plate is generally a whole sheet of resin material. The weak link in the sealing of the explosion-proof lamp is the joint surface between the light-transmitting plate and the housing. In the prior art, generally a large pre-tightening force is used to press the light-transmitting plate on the housing. And after the electrical components heat up, the thermal expansion coefficients of the metal housing and the resin light-transmitting plate are different. Coupled with the large pre-tightening force, it is easier to cause stress concentration and crack the light-transmitting plate. Therefore, generally a thicker light-transmitting plate is used in the prior art, which will lead to increased costs and greater weight. Content of the Utility Model
[0006] In view of the above deficiencies or defects in the prior art, the utility model provides an explosion-proof lamp. The installation method of the light-transmitting plate of the explosion-proof lamp does not require a large pre-tightening force. A thinner light-transmitting plate can be used to achieve the same level of sealing effect.
[0007] The present application provides an explosion-proof lamp, including a rear shell, a light-transmitting plate, and a snap ring for fixing the light-transmitting plate on the rear shell. One side of the rear shell is open, and an installation groove is formed on the open surface. The light-emitting element is installed on the installation groove of the rear shell. The light-transmitting plate is arranged to cover the open surface of the rear shell to seal the light-emitting element on the rear shell.
[0008] The rear shell has a boss surrounding the installation groove. The edge of the light-transmitting plate facing the installation groove is set in a stepped shape. The middle part of the light-transmitting plate is snapped into the installation groove, and the stepped surface of the edge of the light-transmitting plate abuts against the boss of the rear shell.
[0009] A baffle is formed on the rear shell and arranged around the side of the light-transmitting plate. The baffle is arranged in a ring shape and a gap is reserved between the baffle and the edge of the light-transmitting plate. A sealing glue is filled in the gap between the light-transmitting plate and the rear shell.
[0010] In some embodiments, an annular groove is cut at the edge of the light-transmitting plate to form a stepped shape.
[0011] In some embodiments, the bottom surface of the groove at the edge of the light-transmitting plate contacts the top surface of the boss on the rear housing, and the bottom surface of the groove is a ground surface, and the top surface of the boss is a ground surface.
[0012] In some embodiments, the snap ring is fixed to the rear housing by bolts, and the inner edge of the snap ring presses against the outer surface of the light-transmitting plate.
[0013] In some embodiments, the inner edge of the snap ring is aligned with the boss on the rear housing.
[0014] In some embodiments, the boss is located at the edge of the mounting groove.
[0015] Applying the above technical solution of the present utility model to an explosion-proof lamp has the following effects:
[0016] In this application, the edge of the light-transmitting plate is cut on the side facing the mounting groove, so that the light-transmitting plate forms a stepped shape with a convex middle and a concave edge. The protruding part in the middle of the light-transmitting plate is snapped into the mounting groove containing the light-emitting element. The stepped surface at the edge of the light-transmitting plate is a machined surface formed by cutting, and this stepped surface is closely fitted with the boss on the housing. A baffle is provided on the outside of the light-transmitting plate, a gap is formed between the baffle and the peripheral surface of the light-transmitting plate, and sealant is filled in the gap to install the light-transmitting plate. This installation method does not require a large pre-tightening force on the light-transmitting plate, and only requires the light-transmitting plate to be in contact with the boss.
[0017] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a perspective view of an embodiment of the explosion-proof lamp of the present utility model;
[0019] Figure 2 is a half-sectional view of an embodiment of the present utility model;
[0020] Figure 3 is Figure 2 the enlarged view of part A in
[0021] DESCRIPTION OF THE REFERENCE NUMERALS
[0022] 1 - rear housing, 1a - mounting groove, 1b - boss, 1c - baffle;
[0023] 2 - light-transmitting plate, 2a - stepped surface;
[0024] 3 - snap ring;
[0025] 4 - Light - emitting element;
[0026] 5 - Sealant. Detailed implementation manners
[0027] The following will detail the specific implementation manners of the present utility model. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the present utility model, and are not used to limit the present utility model.
[0028] In the present utility model, unless otherwise stated, the orientation terms such as "upper" and "lower" generally refer to the orientation in the assembled and used state. "Inner" and "outer" refer to the inner and outer relative to the contour of each component itself.
[0029] It should be noted that the terms "first", "second", etc. in the description, claims and above - mentioned drawings of the present utility model are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so as to implement the embodiments of the present utility model described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non - exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0030] In the present utility model, an explosion - proof lamp is provided. The explosion - proof lamp includes a rear shell 1, a light - transmissive plate 2, and a snap ring 3 for fixing the light - transmissive plate 2 on the rear shell 1. One side of the rear shell 1 is open, and an installation groove 1a is formed on the open surface. The light - emitting element 4 is installed in the installation groove 1a of the rear shell 1. The light - transmissive plate 2 is arranged to cover the open surface of the rear shell 1 to seal the light - emitting element 4 on the rear shell 1.
[0031] The rear shell 1 has a boss 1b surrounding the installation groove 1a. The edge of the light - transmissive plate 2 facing the installation groove 1a is set in a stepped shape. The middle part of the light - transmissive plate 2 is snapped into the installation groove 1a, and the stepped surface 2a of the edge of the light - transmissive plate 2 abuts against the boss 1b of the rear shell 1.
[0032] A baffle 1c is formed on the rear shell 1 and arranged to surround the side of the light - transmissive plate 2. The baffle 1c is annularly arranged and there is a gap between the baffle 1c and the edge of the light - transmissive plate 2. The gap between the light - transmissive plate 2 and the rear shell 1 is filled with the sealant 5.
[0033] Among them, the rear shell 1 is generally made of aluminum alloy. The rear shell 1 is composed of two independent shells buckled together, with a sealed cavity in the middle. Electrical components are arranged in the cavity and filled with sealant 5 for injection sealing. The light-transmitting plate 2 is usually obtained by cutting a transparent resin plate, and in a few embodiments, high-strength glass material is used. One of the shells is used to install the light-emitting element 4, and the light-emitting element 4 is electrically connected to the electrical components sealed in the cavity through a wire.
[0034] In the prior art, sealant 5 is directly applied to the edge of the installation groove 1a, and then the edge of the light-transmitting plate 2 is pressed on the sealant 5, and then the snap ring 3 is installed. The snap ring 3 applies an extrusion force to the light-transmitting plate 2 to tightly press the light-transmitting plate 2 on the edge of the installation groove 1a. This method requires a relatively large pre-tightening force for the snap ring 3, and the directly applied sealant 5 is prone to leakage.
[0035] In this application, the contact surface between the light-transmitting plate 2 and the rear shell 1 is modified. First, a groove is processed at the edge of the light-transmitting plate 2 to make the edge of the light-transmitting plate 2 present a stepped shape. The protruding part in the middle of the light-transmitting plate 2 is inserted into the installation groove 1a for installing the light-emitting element 4, and the stepped part at the edge of the light-transmitting plate 2 is pressed on the rear shell 1 around the installation groove 1a. The contact part of the rear shell 1 around the installation groove 1a with the light-transmitting plate 2 is also structurally designed. First, a boss 1b is formed around the installation groove 1a at the contact part between the rear shell 1 and the light-transmitting plate 2. The top surface of the boss 1b supports the stepped surface 2a of the light-transmitting plate 2. The width of the boss 1b is smaller than the stepped surface 2a, so that a gap space is formed between the stepped surface 2a of the light-transmitting plate 2 and the rear shell 1, and sealant 5 is filled in the gap space. Further, a baffle 1c is formed around the side of the light-transmitting plate 2 on the rear shell 1, and a gap is reserved between the baffle 1c and the light-transmitting plate 2, so that an L-shaped sealant 5 is formed at the edge of the light-transmitting plate 2 to wrap the edge of the light-transmitting plate 2, achieving a higher sealing effect.
[0036] And the bottom surface of the groove at the edge of the light-transmitting plate 2 contacts the top surface of the boss 1b on the rear shell 1, and the bottom surface of the groove is a ground surface, and the top surface of the boss 1b is a ground surface. The contact surfaces of the light-transmitting plate 2 and the rear shell 1 are both specially ground to improve the fitting accuracy. With the sealant 5 that semi-surrounds the stepped surface 2a and the side surface of the light-transmitting plate 2, the same level of sealing effect can be achieved even with a smaller pre-tightening force.
[0037] The snap ring 3 is fixed on the rear shell 1 by bolts, and the inner edge of the snap ring 3 presses the outer surface of the light-transmitting plate 2. The snap ring 3 can also be called the front shell, which is generally annular. Its main function is to fix the light-transmitting plate 2 to prevent the light-transmitting plate 2 from falling off. In the prior art, the snap ring 3 applies a large extrusion force to the light-transmitting plate 2. But in this application, the snap ring 3 only needs to press the light-transmitting plate 2 against the boss 1b. The inner edge of the snap ring 3 is aligned with the boss 1b on the rear shell 1.
[0038] The boss 1b is located at the edge of the installation groove 1a. There is a gap between the outer rear shell 1 of the boss 1b and the light-transmitting plate 2, and the gap communicates with the gap between the light-transmitting plate 2 and the baffle 1c to form an L-shaped glue injection gap.
[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
[0040] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.
[0041] Furthermore, any combination can be made between various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.
Claims
1. A highly sealed explosion-proof lamp, comprising a rear housing (1), a light-transmitting plate (2), and a snap ring (3) for fixing the light-transmitting plate (2) to the rear housing (1). One side of the rear housing (1) is open, and an installation groove (1a) is provided on this open surface. A light-emitting element (4) is installed in the installation groove (1a) of the rear housing (1). The light-transmitting plate (2) is arranged to cover the open surface of the rear housing (1) to seal the light-emitting element (4) on the rear housing (1); characterized in that ； The rear shell (1) has a boss (1b) surrounding the mounting groove (1a). The edge of the light-transmitting plate (2) facing the mounting groove (1a) is provided in a stepped shape. The middle part of the light-transmitting plate (2) is snapped into the mounting groove (1a), and the stepped surface (2a) of the edge of the light-transmitting plate (2) abuts against the boss (1b) of the rear shell (1). A baffle (1c) is formed on the rear shell (1) and is arranged around the side of the light-transmitting plate (2). The baffle (1c) is arranged in a ring shape and a gap is reserved between the baffle (1c) and the edge of the light-transmitting plate (2). A sealant (5) is filled in the gap between the light-transmitting plate (2) and the rear shell (1).
2. The high-sealing explosion-proof lamp according to claim 1, characterized in that An annular groove is cut at the edge of the light-transmitting plate (2) to form a stepped shape.
3. The high-sealing explosion-proof lamp according to claim 2, characterized in that, The bottom surface of the groove at the edge of the light-transmitting plate (2) contacts the top surface of the boss (1b) on the rear shell (1), and the bottom surface of the groove is a ground surface, and the top surface of the boss (1b) is a ground surface.
4. The high-sealing explosion-proof lamp according to claim 1, characterized in that, The snap ring (3) is fixed to the rear shell (1) by bolts, and the inner edge of the snap ring (3) presses against the outer surface of the light-transmitting plate (2).
5. The high-sealing explosion-proof lamp according to claim 4, characterized in that, The inner edge of the snap ring (3) is aligned with the boss (1b) on the rear shell (1).
6. The high-sealing explosion-proof lamp according to claim 1, characterized in that, The boss (1b) is located at the edge of the mounting groove (1a).