Double-sealing type explosion-proof lighting lamp

Abstract

The utility model provides a double-sealing type explosion-proof lighting lamp which comprises a shell used for installing the lighting lamp. The sealing plate is arranged in the shell and is used for sealing the lighting lamp; the cover plate is installed at the bottom of the shell and used for fixing the position of the sealing plate in the shell, and when the cover plate is arranged to be inserted into the shell, gas in the shell is pumped to be in a negative pressure state; and the first sealing piece is mounted between the sealing plate and the cover plate. By using the first sealing element containing the shape memory alloy, the self-adaptive expansion and contraction of the sealing element in an extreme temperature environment are realized, the stress distribution of a sealing interface is kept uniform, and real-time monitoring and response can be carried out according to the ambient temperature and air pressure change around and inside the shell; the sealing structure can still keep stable sealing performance, and external gas is prevented from permeating into the cavity.

Description

Technical Field

[0001] This utility model relates to a lighting fixture, and more particularly to a double-sealed explosion-proof lighting fixture. Background Technology

[0002] In the field of lighting fixtures, especially for explosion-proof lighting fixtures, the sealing performance of their chambers is crucial. These fixtures are typically designed for use in environments where explosive gases or vapors may be present. Therefore, their sealing structure must not only prevent the intrusion of external contaminants such as moisture and dust, but also effectively isolate potential external explosive environments, ensuring that the fixture does not cause the spread of an explosion under normal operating conditions or in case of malfunction.

[0003] Currently, the most widely used sealing methods on the market mainly include the use of sealant and sealing rings with fixed structural shapes. Both methods have their advantages and disadvantages, but their limitations are particularly significant when facing extreme temperature environments.

[0004] When the lighting fixture cavity is exposed to a high-temperature environment, the sealant is prone to thermal expansion, which may lead to uneven stress distribution at the sealing interface or even seal failure. Under low-temperature conditions, the sealant may shrink and reduce its sealing effect.

[0005] Sealing rings are usually made of rubber or other elastic materials. Sealing rings with a fixed shape are difficult to adapt to the dimensional changes of materials caused by thermal expansion and contraction. This not only affects the long-term reliability of the seal, but may also allow external gas to penetrate into the cavity due to poor sealing, threatening the safety of the lamp and the surrounding environment.

[0006] Existing sealing structures often overlook the impact of the pressure difference between the inside and outside of the cavity on the sealing effect. In the application scenarios of explosion-proof lighting fixtures, even small changes in the pressure difference between the inside and outside of the cavity can become the driving force for gas infiltration, further exacerbating the difficulty of sealing. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a double-sealed explosion-proof lighting fixture, which addresses the above-mentioned technical defects in the existing sealing structure of lighting fixtures.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A double-sealed explosion-proof lighting fixture, comprising:

[0010] Housing for mounting lighting fixtures;

[0011] A sealing plate, installed inside the housing, is used to seal the lighting fixture;

[0012] A cover plate, installed at the bottom of the housing, is used to fix the position of the sealing plate inside the housing. The cover plate is configured to draw the gas inside the housing to a negative pressure state when inserted into the housing.

[0013] The first sealing element is installed between the sealing plate and the cover plate to seal the connection between the cover plate and the sealing plate.

[0014] The second seal is installed between the housing and the sealing plate to seal the connection between the housing and the sealing plate.

[0015] A liquid storage tube is installed on the cover plate for storing liquid; the first sealing element has a hollow annular structure with several shape memory alloys arranged in a circumferential array inside, which are designed to deform when heated or cooled to drive the first sealing element to expand or contract.

[0016] Preferably, the cover plate includes: an explosion-proof plate, installed on the cover plate, for providing explosion-proof protection for the lighting fixture; a first temperature sensor, installed on the cover plate, for detecting the ambient temperature around the housing, the first temperature sensor being configured to control the liquid in the storage tube to flow into the first seal when the ambient temperature around the housing is higher than or lower than a preset value; and a first air pressure sensor, installed on the cover plate, for detecting the air pressure around the housing, the first air pressure sensor being configured to control the liquid in the storage tube to flow into the first seal when the air pressure around the housing is higher than or lower than a preset value.

[0017] Preferably, the top and bottom of the first seal are both recessed to provide space for the first seal to expand.

[0018] Preferably, the shape memory alloy is elliptical and fits into two recesses of the first seal.

[0019] Preferably, the double-sealed explosion-proof lighting fixture further includes: an annular groove formed on the outer ring of the cover plate, with the liquid storage pipe installed in the annular groove; a delivery pump installed in the annular groove, with the inlet end of the delivery pump connected to the liquid storage pipe and the outlet end of the delivery pump connected to the first sealing element; a heater installed in the annular groove; and a heating wire connected in the liquid storage pipe and connected to the heater for heating the liquid in the liquid storage pipe.

[0020] Preferably, the double-sealed explosion-proof lighting fixture further includes: a second pressure sensor installed inside the housing for detecting the pressure inside the housing; and a second temperature sensor installed inside the housing for detecting the temperature inside the housing.

[0021] Preferably, the outer casing includes: a plurality of grooves formed on the inner wall of the outer casing and arranged in a circumferential array; a plurality of one-way valves respectively installed in the plurality of grooves; and a plurality of piston heads respectively connected to the plurality of grooves.

[0022] More preferably, the outer casing further includes: a plurality of movable slots formed at the bottom of the outer casing; a plurality of movable plates respectively installed in the plurality of movable slots, one end of the movable plates contacting the cover plate; a plurality of racks respectively connected to the plurality of movable plates; a plurality of lead screws respectively connected to the plurality of movable slots, one end of the lead screws connected to the piston head; and a plurality of gears respectively connected to the plurality of lead screws, the gears meshing with the racks.

[0023] More preferably, the outer shell further includes: a plurality of elastic elements, one end of which is connected to the inner wall of a plurality of movable slots, and the other end of which is connected to a plurality of movable plates.

[0024] Preferably, the inner wall of the outer casing is formed with a threaded groove, and the cover plate is provided with threads, and the cover plate is connected to the threaded groove on the outer casing through the threads.

[0025] Preferably, the double-sealed explosion-proof lighting fixture further includes: a lamp panel installed inside the housing; and a heat sink installed on the top of the housing for providing heat dissipation for the lamp panel.

[0026] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0027] (1) By using a first seal containing a shape memory alloy, this solution achieves adaptive expansion and contraction of the seal under extreme temperature conditions. The shape memory alloy can automatically adjust its shape according to the change of ambient temperature, maintain uniform stress distribution at the sealing interface, and effectively avoid the sealing failure problem caused by thermal expansion and contraction.

[0028] (2) The combined use of the first and second seals, and their tight fit with the housing and sealing plate, significantly enhances the reliability of the sealing structure. The multi-seal design can effectively prevent external gases, moisture and dust and other contaminants from entering the lamp chamber, ensuring the normal operation and long-term stability of the lamp.

[0029] (3) This solution introduces intelligent components such as a first temperature sensor, a first air pressure sensor, a delivery pump and a heater, which can monitor and respond in real time according to the changes in ambient temperature and air pressure around and inside the casing. When abnormal parameters are detected, the system can automatically adjust the sealing performance of the first seal, thereby further improving the adaptability and reliability of the sealing structure.

[0030] (4) By using the negative pressure generated during the installation of the cover plate and the design of the air pressure regulating mechanism such as the piston head and the one-way valve, the influence of the air pressure difference between the inside and outside of the cavity on the sealing effect is effectively addressed. This ensures that the sealing structure can maintain stable sealing performance when the air pressure difference changes, preventing external gas from penetrating into the cavity. The sealing structure not only enhances the explosion-proof performance of the lighting fixtures, but also improves the overall structural safety through intelligent monitoring and response mechanisms. It can ensure the safety of the lighting fixtures and the surrounding environment in extreme environments and reduce the safety risks caused by sealing failure. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of a double-sealed explosion-proof lighting fixture according to the present invention.

[0032] Figure 2 This is a three-dimensional structural diagram of a double-sealed explosion-proof lighting fixture according to this utility model.

[0033] Figure 3 This is a schematic diagram of the cross-sectional structure of the cover plate of a double-sealed explosion-proof lighting fixture according to this utility model.

[0034] Figure 4 This is a schematic diagram of the cross-sectional structure of the outer shell, cover plate, and liquid storage pipe of a double-sealed explosion-proof lighting fixture according to this utility model.

[0035] Figure 5 This is a schematic diagram of the structure of the first sealing element, liquid storage pipe, delivery pump and heater of a double-sealed explosion-proof lighting fixture according to this utility model.

[0036] Figure 6 This is a schematic diagram of the cross-sectional structure of the sealing plate, the first sealing element, and the second sealing element of a double-sealed explosion-proof lighting fixture according to this utility model.

[0037] Figure 7 This is a schematic diagram of the cross-sectional structure of the outer shell and cover plate of a double-sealed explosion-proof lighting fixture according to this utility model.

[0038] Figure 8 This is a schematic diagram of the cross-sectional structure of the first sealing element of a double-sealed explosion-proof lighting fixture according to this utility model.

[0039] Figure 9 This is a schematic diagram of the shape memory alloy structure of a double-sealed explosion-proof lighting fixture according to this utility model.

[0040] Figure 10 This is a schematic diagram of the deformation of a shape memory alloy for a double-sealed explosion-proof lighting fixture according to this utility model.

[0041] The accompanying figures are labeled as follows:

[0042] 1. Housing; 101. Radiator; 102. Lamp panel; 103. Groove; 104. One-way valve; 105. Piston head; 106. Lead screw; 107. Gear; 108. Moving plate; 109. Rack; 110. Elastic element; 111. Moving groove;

[0043] 2. Cover plate; 201. Explosion-proof plate; 202. First temperature sensor; 203. First air pressure sensor;

[0044] 3. Sealing plate;

[0045] 4. First seal; 401, shape memory alloy; 402, recess;

[0046] 5. Second sealing element;

[0047] 6. Second air pressure sensor;

[0048] 7. Second temperature sensor;

[0049] 8. Liquid storage pipe; 801. Transfer pump; 802. Heater; 803. Heating wire. Detailed Implementation

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0051] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Reference Figures 1-10A double-sealed explosion-proof lighting fixture includes: a housing 1 for mounting the lighting fixture, serving as the main body of the entire sealing structure. The housing 1 not only provides installation space for the lighting fixture but also ensures its safe operation in harsh environments through its robust structure. The design of the housing 1 takes explosion-proof performance into account, effectively resisting the impact of external explosive environments; a sealing plate 3 installed inside the housing 1 for sealing the lighting fixture. The sealing plate 3 plays a crucial sealing role, preventing external gases, moisture, dust, and other contaminants from entering the lighting fixture chamber, ensuring the normal operation and long-term stability of the lighting fixture; and a cover plate 2 installed at the bottom of the housing 1 to fix the position of the sealing plate 3 inside the housing 1. The cover plate 2 is designed to draw the gas inside the housing 1 to a negative pressure state when inserted into the housing 1. The cover plate 2 not only fixes the position of the sealing plate 3 inside the housing 1 but also further enhances the sealing effect through the negative pressure state generated when it is inserted into the housing 1. The explosion-proof plate 201 installed on the cover plate 2 is for the lighting fixture. The device provides additional explosion-proof protection, enhancing the overall structural safety. The first seal 4, installed between the sealing plate 3 and the cover plate 2, seals the connection between the cover plate 2 and the sealing plate 3. The hollow annular structure of the first seal 4 and the shape memory alloy 401 inside allow it to expand or contract according to changes in ambient temperature, adaptively adjusting the sealing effect. This not only improves the reliability of the seal but also extends its service life. The second seal 5, installed between the outer shell 1 and the sealing plate 3, seals the connection between the outer shell 1 and the sealing plate 3. The second seal 5 further enhances the sealing performance between the outer shell 1 and the sealing plate 3, ensuring complete isolation of the lamp chamber and preventing interference from the external environment. The liquid storage tube 8, installed on the cover plate 2, stores liquid. The first seal 4 has a hollow annular structure with several shape memory alloys 401 inside, arranged in a circumferential array. These are designed to deform when heated or cooled, causing the first seal 4 to expand or contract.

[0053] When the lighting fixture chamber is in a high-temperature environment, the sealing material may expand due to heat caused by thermal expansion and contraction. The sealing structure needs to be able to expand to better fit the sealing surface and prevent seal failure caused by material expansion. In some cases, the lighting fixture chamber may face increased external pressure, such as wind or changes in air pressure. In this case, the sealing structure needs to be able to expand to resist external pressure and ensure sealing performance, especially for outdoor lighting fixtures such as streetlights and floodlights, which require this adaptive capability. Conversely, in low-temperature environments, the sealing material may contract due to cold. The adaptive sealing structure needs to be able to contract to accommodate the material's contraction while maintaining sufficient sealing performance. In cold regions or winter, the internal temperature of the lighting fixture chamber may drop significantly, making the contraction capability of the adaptive sealing structure particularly important. When the lighting fixture chamber faces decreased external pressure, the adaptive sealing structure needs to be able to contract to reduce the contact pressure with the sealing surface and avoid excessive wear and leakage.

[0054] Cover plate 2 includes: an explosion-proof plate 201, installed on cover plate 2, for providing explosion-proof protection for lighting fixtures; a first temperature sensor 202, installed on cover plate 2, for detecting the ambient temperature around housing 1, the first temperature sensor 202 is configured to control the liquid in the liquid storage pipe 8 to flow into the first seal 4 when the ambient temperature around housing 1 is higher or lower than a preset value; and a first air pressure sensor 203, installed on cover plate 2, for detecting the air pressure around housing 1, the first air pressure sensor 203 is configured to detect the air pressure around housing 1 when the air pressure around housing 1 is higher or lower than a preset value. When the value is set, the liquid in the storage tube 8 flows into the first seal 4. The first temperature sensor 202 and the first air pressure sensor 203 are used to detect the ambient temperature and air pressure around the housing 1, respectively. When these parameters exceed the preset value, the control of the delivery pump 801 and the heater 802 is triggered. The heater 802 controls the heating wire 803 to heat the liquid in the storage tube 8. The delivery pump 801 sends the heated liquid into the first seal 4 to adjust the deformation of the first seal 4. The intelligent design improves the response speed and adaptability of the sealing structure.

[0055] The top and bottom of the first seal 4 are both formed with recesses 402 to provide space for the expansion of the first seal 4.

[0056] The shape memory alloy 401 is elliptical and fits into the two recesses 402 of the first seal 4.

[0057] An annular groove is formed on the outer ring of the cover plate 2, and a liquid storage pipe 8 is installed inside the annular groove. A delivery pump 801 is installed inside the annular groove, with its inlet end connected to the liquid storage pipe 8 and its outlet end connected to the first sealing element 4. The liquid storage pipe 8 is used to store liquid, while the delivery pump 801 is responsible for delivering the liquid to the first sealing element 4, allowing the sealing element to be filled with liquid in real time as needed and its sealing performance adjusted. A heater 802 is installed inside the annular groove. A heating wire 803 is connected inside the liquid storage pipe 8 and connected to the heater 802 for heating the liquid inside the liquid storage pipe 8. The heater 802 and the heating wire 803 for heating the liquid inside the liquid storage pipe 8 further enhance the self-adaptability of the sealing element, enabling it to maintain a stable sealing effect over a wider temperature range.

[0058] The second pressure sensor 6 is installed inside the housing 1 to detect the air pressure inside the housing 1; the second temperature sensor 7 is installed inside the housing 1 to detect the temperature inside the housing 1.

[0059] The outer casing 1 includes: a plurality of grooves 103 formed on the inner wall of the outer casing 1 and arranged in a circumferential array; a plurality of one-way valves 104 respectively installed in the plurality of grooves 103; a plurality of piston heads 105 respectively connected in the plurality of grooves 103; a plurality of movable slots 111 formed at the bottom of the outer casing 1; a plurality of movable plates 108 respectively installed in the plurality of movable slots 111, one end of the movable plates 108 contacting the cover plate 2; a plurality of racks 109 respectively connected to the plurality of movable plates 108; and a plurality of lead screws. 106, each connected to a plurality of movable slots 111, with one end of the lead screw 106 connected to the piston head 105; a plurality of gears 107, each connected to a plurality of lead screws 106, meshing with racks 109; when the cover plate 2 is installed on the outer casing 1, it presses against a plurality of movable plates 108, causing the movable plates 108 to move within the movable slots 111 under pressure, and pressing against the elastic element 110; the movable plates 108 drive the racks 109 to move, the racks 109 drive the gears 107 to rotate, and the gears 107 drive the lead screws 106 to rotate. The lead screw 106 controls the movement of the piston head 105, which draws the gas inside the outer shell 1 into the groove 103. The gas enters the groove 103 through the one-way valve 104, creating a negative pressure inside the outer shell 1 and adsorbing the sealing plate 3 onto the second sealing element 5. Several elastic elements 110 are connected at one end to the inner wall of several moving grooves 111 and at the other end to several moving plates 108. The elastic elements 110 are made of stainless steel springs. They can also provide additional support and cushioning for the moving plates 108, preventing damage or failure due to excessive movement. They also help maintain the stability of the moving plates 108 and improve the overall performance of the air pressure regulation system. When the gas in the chamber is extracted to form a vacuum, the pressure difference between the inside and outside of the chamber increases, making it more difficult for external gas to penetrate into the chamber. Vacuuming can reduce the number of gas molecules in the chamber, thereby reducing the risk of leakage caused by the movement of gas molecules. Vacuuming can also reduce the corrosion and oxidation of the sealing structure by the gas in the chamber, thereby extending the service life of the sealing structure.

[0060] A threaded groove is formed on the inner wall of the outer casing 1, and a thread is provided on the cover plate 2. The cover plate 2 is connected to the threaded groove on the outer casing 1 through the thread. The connection between the cover plate 2 and the threaded groove on the outer casing 1 not only simplifies the installation process, but also improves the reliability and stability of the connection. It also helps to prevent external gas or liquid from seeping into the lamp chamber through the connection.

[0061] The lamp panel 102 is installed inside the housing 1; the heat sink 101 is installed on top of the housing 1 to provide heat dissipation for the lamp panel 102. As the core component of the lighting fixture, the lamp panel 102 provides the necessary lighting function, while the heat sink 101, through its efficient heat dissipation performance, ensures the stability and reliability of the lamp panel 102 under long-term operation. This design extends the service life of the lighting fixture and improves its overall performance.

[0062] During use, the lamp plate 102 of the lighting fixture is installed inside the housing 1, and the sealing plate 3 is installed inside the housing 1 to seal the lighting fixture. The cover plate 2 is connected to the threaded groove on the housing 1 via threads. During the connection process, the cover plate 2 presses against the moving plate 108. The moving plate 108 moves within the moving groove 111 and presses against the elastic element 110. The moving plate 108 drives the rack 109 to move, and the rack 109 further drives the gear 107 to rotate. The rotation of the gear 107 drives the lead screw 106 to rotate, and the lead screw 106 controls the piston head 105 to move. The piston head 105 draws the gas inside the housing 1 into the groove 103 opened on the inner wall of the housing 1. The one-way valve 104 enters the groove 103, creating a negative pressure inside the outer shell 1 and adsorbing the sealing plate 3 onto the second sealing element 5, enhancing the sealing effect. The first sealing element 4 and the second sealing element 5 are respectively installed between the sealing plate 3 and the cover plate 2, and between the outer shell 1 and the sealing plate 3, ensuring complete isolation of the lamp chamber. The explosion-proof plate 201 on the cover plate 2 provides additional explosion-proof protection for the lamp. The hollow annular structure of the first sealing element 4 and the shape memory alloy 401 inside it can expand or contract according to changes in ambient temperature, adaptively adjusting the sealing effect. The first temperature sensor 202 and the second temperature sensor 7 detect the temperature around and inside the outer shell 1, respectively. The ambient temperature is monitored by the first pressure sensor 203 and the second pressure sensor 6, which detect the air pressure around and inside the outer casing 1, respectively. When these parameters (temperature or air pressure) exceed preset values, the control of the delivery pump 801 and the heater 802 is triggered. The heater 802 heats the liquid in the storage tube 8 through the heating wire 803. The delivery pump 801 delivers the heated liquid into the first seal 4. The shape memory alloy 401 deforms when heated, causing the first seal 4 to expand, thereby adjusting its deformation and enhancing the sealing effect. The storage tube 8 is installed in the annular groove of the cover plate 2 to store the liquid. When it is necessary to adjust the sealing performance of the first seal 4, the delivery pump... 801 The liquid in the storage tube 8 is sent into the first seal 4. The top and bottom of the first seal 4 are both formed with recesses 402 to provide space for the expansion of the first seal 4. The shape memory alloy 401 is elliptical and fits into these recesses 402 to further enhance the sealing effect. The heat sink 101 is installed on the top of the housing 1 to provide heat dissipation for the lamp panel 102 and ensure the stability and reliability of the lamp panel 102 under long-term operation. The system continuously monitors the ambient temperature and air pressure around and inside the housing 1. Based on the monitoring results, the sealing performance of the first seal 4 is adjusted in a timely manner. Each component is inspected and maintained regularly to ensure the stability and reliability of the entire sealing structure.

[0063] By using a first seal 4 containing shape memory alloy 401, this solution achieves adaptive expansion and contraction of the seal under extreme temperature conditions. The shape memory alloy 401 can automatically adjust its shape according to changes in ambient temperature, maintain uniform stress distribution at the sealing interface, and effectively avoid sealing failure caused by thermal expansion and contraction.

[0064] The combined use of the first seal 4 and the second seal 5, as well as their tight fit with the housing 1 and the sealing plate 3, significantly enhances the reliability of the sealing structure. The multi-seal design effectively prevents external gases, moisture, dust and other contaminants from entering the lamp chamber, ensuring the normal operation and long-term stability of the lamp.

[0065] This solution incorporates intelligent components such as a first temperature sensor 202, a first air pressure sensor 203, a delivery pump 801, and a heater 802. These components enable real-time monitoring and response to changes in ambient temperature and air pressure around and inside the housing 1. When abnormal parameters are detected, the system can automatically adjust the sealing performance of the first seal 4, thereby further improving the adaptability and reliability of the sealing structure.

[0066] The negative pressure generated during the installation of cover plate 2, along with the design of the air pressure regulating mechanisms such as piston head 105 and one-way valve 104, effectively addresses the impact of the pressure difference between the inside and outside of the chamber on the sealing effect. This ensures that the sealing structure maintains stable sealing performance even when the pressure difference changes, preventing external gas from penetrating into the chamber. The sealing structure not only enhances the explosion-proof performance of the lighting fixtures but also improves the overall structural safety through intelligent monitoring and response mechanisms. It can ensure the safety of the lighting fixtures and their surrounding environment in extreme environments and reduce the safety risks caused by sealing failure.

[0067] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0068] Secondly, the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0069] Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-sealed explosion-proof lighting fixture, characterized by, The utility model relates to a sealing device for lighting lamps and lanterns, comprising: a housing (1) for installing a lighting fixture; a sealing plate (3) installed in the housing (1) for sealing the lighting fixture; a cover plate (2) installed at the bottom of the housing (1) for fixing the position of the sealing plate (3) in the housing (1), the cover plate (2) being arranged to draw the gas in the housing (1) to a negative pressure state when inserted into the housing (1); a first sealing member (4) installed between the sealing plate (3) and the cover plate (2) for sealing the connection between the cover plate (2) and the sealing plate (3); a second sealing member (5) installed between the housing (1) and the sealing plate (3) for sealing the connection between the housing (1) and the sealing plate (3); a liquid storage tube (8) installed on the cover plate (2) for storing liquid; the first sealing member (4) has a hollow ring structure, and a plurality of shape memory alloys (401) are arranged in the first sealing member (4) in a circumferential array, the shape memory alloys (401) being arranged to deform when heated or cooled to drive the first sealing member (4) to expand or contract.

2. The double sealed explosion-proof luminaire of claim 1, wherein the cover plate (2) comprises: an explosion-proof plate (201) installed on the cover plate (2) for providing explosion-proof protection for the lighting fixture; a first temperature sensor (202) installed on the cover plate (2) for detecting the ambient temperature of the housing (1), the first temperature sensor (202) being arranged to control the liquid in the liquid storage tube (8) to flow into the first sealing member (4) when the ambient temperature of the housing (1) is higher or lower than a preset value; a first air pressure sensor (203) installed on the cover plate (2) for detecting the air pressure around the housing (1), the first air pressure sensor (203) being arranged to control the liquid in the liquid storage tube (8) to flow into the first sealing member (4) when the air pressure around the housing (1) is higher or lower than a preset value.

3. The double sealed explosion-proof luminaire of claim 1, wherein the top and bottom of the first sealing member (4) are each formed with a recess (402) for providing space for the expansion of the first sealing member (4); and the shape memory alloys (401) are in the shape of an ellipse and fit the two recesses (402) of the first sealing member (4).

4. The double sealed explosion-proof luminaire of claim 1, wherein Further comprising: a ring-shaped groove formed in the outer ring of the cover plate (2), the liquid storage tube (8) being installed in the ring-shaped groove; a delivery pump (801) installed in the ring-shaped groove, the water inlet end of the delivery pump (801) being connected with the liquid storage tube (8), and the water outlet end of the delivery pump (801) being connected with the first sealing member (4); a heater (802) installed in the ring-shaped groove; a heating wire (803) connected in the liquid storage tube (8) and connected with the heater (802) for heating the liquid in the liquid storage tube (8).

5. The double sealed explosion-proof luminaire of claim 1, wherein, Further comprising: a second air pressure sensor (6) installed in the housing (1) for detecting the air pressure in the housing (1); a second temperature sensor (7) installed in the housing (1) for detecting the temperature in the housing (1).

6. The dual sealed explosion-proof luminaire of claim 1, wherein, the housing (1) comprises: a plurality of grooves (103) formed in the inner wall of the housing (1) in a circumferential array; a plurality of one-way valves (104) respectively installed in the plurality of grooves (103). A plurality of piston heads (105) are connected in the plurality of grooves (103) respectively.

7. The double sealed explosion-proof luminaire of claim 6, wherein, The shell (1) further comprises: A plurality of moving grooves (111) are arranged on the bottom of the shell (1); A plurality of moving plates (108) are arranged in the plurality of moving grooves (111) respectively, one end of the moving plate (108) is in contact with the cover plate (2); A plurality of racks (109) are connected on the plurality of moving plates (108) respectively; A plurality of lead screws (106) are connected in the plurality of moving grooves (111) respectively, one end of the lead screw (106) is connected with the piston head (105); A plurality of gears (107) are connected on the plurality of lead screws (106) respectively, the gear (107) is engaged with the rack (109).

8. The double sealed explosion-proof luminaire of claim 7, wherein, The shell (1) further comprises: A plurality of elastic members (110) are connected on the inner wall of the plurality of moving grooves (111) respectively, the other end is connected on the plurality of moving plates (108) respectively.

9. The double sealed explosion-proof luminaire of claim 1, wherein, The inner wall of the shell (1) is formed with a threaded groove, the cover plate (2) is provided with a thread, the cover plate (2) is connected with the threaded groove on the shell (1) through the thread.

10. The double sealed explosion-proof luminaire of claim 1, wherein, Further comprising: A lamp plate (102) is arranged in the shell (1); A heat sink (101) is arranged on the top of the shell (1), which is used for providing heat dissipation for the lamp plate (102).

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