Explosion-proof lighting lamp cavity sealing structure

Abstract

The invention relates to the field of lighting lamps, and discloses an explosion-proof lighting lamp cavity sealing structure which comprises a shell, a sealing ring and a sealing cover. 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. In the invention, 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] The present invention belongs to the field of lighting fixtures, and relates to an explosion-proof lighting fixture, in particular to a chamber sealing structure for an explosion-proof lighting fixture. Background Art

[0002] In the field of lighting fixtures, especially for explosion-proof lighting fixtures, the sealing performance of their chambers is crucial. Such fixtures are usually designed for environments where explosive gases or vapors may exist. Therefore, their sealing structures not only need to prevent the intrusion of external pollutants such as moisture and dust, but also must be able to effectively isolate the external potential explosive environment to ensure that the fixture will not cause the spread of explosion under normal working and fault conditions.

[0003] Currently, the widely used sealing means in the market mainly include using 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 chamber of a lighting fixture is exposed to a high-temperature environment, the sealant is prone to heat expansion, which may lead to uneven stress distribution at the sealing interface and even cause sealing failure. Under low-temperature conditions, the sealant may shrink and reduce the sealing effect;

[0005] Sealing rings are usually made of rubber or other elastic materials. It is difficult for a sealing ring with a fixed shape to adapt to the dimensional changes of the material due to thermal expansion and contraction. This not only affects the long-term reliability of the seal, but also may cause external gas to penetrate into the chamber due to poor sealing, threatening the safety of the fixture and the surrounding environment;

[0006] Existing sealing structures often ignore the influence of the air pressure difference inside and outside the chamber on the sealing effect. In the application scenario of explosion-proof lighting fixtures, even a slight change in the air pressure difference inside and outside the chamber may become the driving force for gas penetration, further increasing the difficulty of sealing. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: in view of the above technical defects existing in the existing sealing structure for lighting fixtures, to provide a chamber sealing structure for an explosion-proof lighting fixture.

[0008] To solve the above technical problems, the present invention adopts the following technical solutions:

[0009] An explosion-proof lighting fixture chamber sealing structure, comprising: a housing for installing the lighting fixture; a sealing plate installed inside the housing for sealing the lighting fixture; a cover plate installed at the bottom of the housing for fixing the position of the sealing plate inside the housing, and when the cover plate is set to be inserted into the housing, the gas inside the housing is pumped to a negative pressure state; a first seal installed between the sealing plate and the cover plate for sealing the connection between the cover plate and the sealing plate; a second seal installed between the housing and the sealing plate for sealing the connection between the housing and the sealing plate; a liquid storage pipe installed on the cover plate for storing liquid; the first seal is in a hollow annular structure, and several shape memory alloys are arranged inside it in a circumferential array, and are set to deform when heated or cooled, so as to drive the first seal to expand or contract; 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, and the first temperature sensor is set to control the liquid in the liquid storage pipe to flow into the first seal when the ambient temperature around the housing is higher or lower than a preset value; a first pressure sensor installed on the cover plate for detecting the air pressure around the housing, and the first pressure sensor is set to control the liquid in the liquid storage pipe to flow into the first seal when the air pressure around the housing is higher or lower than a preset value.

[0010] Preferably, depressions are formed at both the top and bottom of the first seal for providing space for the expansion of the first seal.

[0011] Preferably, the shape memory alloy is oval and fits with the two depressions of the first seal.

[0012] Preferably, the explosion-proof lighting fixture chamber sealing structure further includes: an annular groove opened on the outer ring of the cover plate, and the liquid storage pipe is installed in the annular groove; a transfer pump installed in the annular groove, the water inlet end of the transfer pump is connected to the liquid storage pipe, and the water outlet end of the transfer pump is connected to the first seal; a heater installed in the annular groove; a heating wire connected inside the liquid storage pipe and connected to the heater for heating the liquid in the liquid storage pipe.

[0013] Preferably, the explosion-proof lighting fixture chamber sealing structure further includes: a second pressure sensor installed inside the housing for detecting the air pressure inside the housing; a second temperature sensor installed inside the housing for detecting the temperature inside the housing.

[0014] The housing includes: several grooves opened on the inner wall of the housing and arranged in a circumferential array; several one-way valves respectively installed in several grooves; several piston heads respectively connected in several grooves.

[0015] The housing further includes: a plurality of moving grooves formed in the bottom of the housing; a plurality of moving plates respectively installed in the plurality of moving grooves, one end of the moving plate being in contact with the cover plate; a plurality of racks respectively connected to the plurality of moving plates; a plurality of lead screws respectively connected in the plurality of moving grooves, one end of the lead screw being connected to the piston head; and a plurality of gears respectively connected to the plurality of lead screws, the gears meshing with the racks.

[0016] The housing further includes: a plurality of elastic members, one end of each of which is respectively connected to the inner wall of the plurality of moving grooves, and the other end of each of which is respectively connected to the plurality of moving plates.

[0017] Threaded grooves are formed on the inner wall of the housing, and threads are provided on the cover plate. The cover plate is connected to the threaded grooves on the housing through the threads.

[0018] Preferably, the explosion-proof lighting fixture chamber sealing structure further includes: a lamp board installed in the housing; and a radiator installed on the top of the housing for dissipating heat for the lamp board.

[0019] The present invention adopts the above technical solutions, and compared with the prior art, has the following technical effects:

[0020] (1) By using the first seal containing shape memory alloy, the present solution realizes the self-adaptive expansion and contraction of the seal in an extreme temperature environment. The shape memory alloy can automatically adjust its shape according to the change of the environmental temperature, keep the stress distribution of the seal interface uniform, and effectively avoid the seal failure problem caused by thermal expansion and contraction.

[0021] (2) The combined use of the first seal and the second seal, and their tight fit with the housing and the seal plate significantly enhance the reliability of the sealing structure. The multiple sealing design can effectively prevent external pollutants such as gas, moisture and dust from entering the lamp chamber, ensuring the normal operation and long-term stability of the lamp.

[0022] (3) The present solution introduces intelligent components such as the first temperature sensor, the first pressure sensor, the delivery pump and the heater, which can perform real-time monitoring and response according to the changes of the environmental temperature and pressure around and inside the housing. 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.

[0023] (4) Through the negative pressure state generated during the installation of the cover plate and the design of pneumatic regulating mechanisms such as the piston head and check valve, the influence of the air pressure difference inside and outside the chamber on the sealing effect is effectively addressed. It can ensure that when the air pressure difference changes, the sealing structure can still maintain stable sealing performance, prevent external gas from penetrating into the chamber interior. The sealing structure not only enhances the explosion-proof performance of the lighting fixture but also improves the safety of the overall structure through an intelligent monitoring and response mechanism. It can ensure the safety of the fixture and the surrounding environment in extreme environments and reduce the safety risks caused by seal failure. Brief Description of the Drawings

[0024] Figure 1 It is a three-dimensional structure schematic diagram of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0025] Figure 2 It is a three-dimensional structure schematic diagram of another perspective of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0026] Figure 3 It is a cross-sectional structure schematic diagram of the cover plate of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0027] Figure 4 It is a cross-sectional structure schematic diagram of the housing, cover plate, and liquid storage pipe of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0028] Figure 5 It is a structure schematic diagram of the first seal, liquid storage pipe, transfer pump, and heater of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0029] Figure 6 It is a cross-sectional structure schematic diagram of the sealing plate, first seal, and second seal of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0030] Figure 7 It is a cross-sectional structure schematic diagram of the housing and cover plate of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0031] Figure 8 It is a cross-sectional structure schematic diagram of the first seal of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0032] Figure 9 It is a structure schematic diagram of the shape memory alloy of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0033] Figure 10 It is a deformation schematic diagram of the shape memory alloy of the chamber sealing structure of an explosion-proof lighting fixture according to the present invention.

[0034] Among them, each reference numeral is:

[0035] 1. Housing; 101. Radiator; 102. Lamp board; 103. Groove; 104. Check valve; 105. Piston head; 106. Lead screw; 107. Gear; 108. Moving plate; 109. Rack; 110. Elastic member; 111. Moving groove;

[0036] 2. Cover plate; 201. Explosion-proof plate; 202. First temperature sensor; 203. First pressure sensor;

[0037] 3. Sealing plate;

[0038] 4. First seal; 401. Shape memory alloy; 402. Depression;

[0039] 5. Second seal;

[0040] 6. Second pressure sensor;

[0041] 7. Second temperature sensor;

[0042] 8. Liquid storage pipe; 801. Delivery pump; 802. Heater; 803. Heating wire. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0044] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0045] Refer to Figures 1 - 10, an explosion-proof lighting fixture chamber sealing structure, comprising: a housing 1 for installing the lighting fixture, serving as the main body of the entire sealing structure. The housing 1 not only provides an installation space for the lighting fixture but also ensures the safe operation of the fixture in a harsh environment through its sturdy structure. The design of the housing 1 takes into account explosion-proof performance and can effectively resist the impact of the external explosive environment; a sealing plate 3 installed inside the housing 1 for sealing the lighting fixture. The sealing plate 3 installed inside the housing 1 plays a crucial sealing role, preventing external pollutants such as gases, moisture, and dust from entering the fixture chamber and ensuring the normal operation and long-term stability of the fixture; a cover plate 2 installed at the bottom of the housing 1 for fixing the position of the sealing plate 3 inside the housing 1. When the cover plate 2 is set to be inserted into the housing 1, the gas inside the housing 1 is pumped to a negative pressure state. 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 provides additional explosion-proof protection for the fixture and enhances the safety of the overall structure; a first seal 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. The hollow annular structure of the first seal 4 and the shape memory alloy 401 provided inside it enable it to expand or contract according to the change in ambient temperature, adaptively adjusting the sealing effect, not only improving the reliability of the seal but also extending the service life of the seal; a second seal 5 installed between the housing 1 and the sealing plate 3 for sealing the connection between the housing 1 and the sealing plate 3. The second seal 5 further enhances the sealing performance between the housing 1 and the sealing plate 3, ensuring the complete isolation of the fixture chamber and preventing interference from the external environment; a liquid storage tube 8 installed on the cover plate 2 for storing liquid; the first seal 4 is of a hollow annular structure, and several shape memory alloys 401 are provided inside it, distributed in a circumferential array, and are set to deform when heated or cooled to drive the first seal 4 to expand or contract.

[0046] When the lighting fixture chamber is in a high-temperature environment, due to the principle of thermal expansion and contraction, the sealing material may expand due to heat, and the sealing structure needs to be able to expand to better fit the sealing surface and prevent sealing failure caused by material expansion; in some cases, the fixture chamber may face an increase in external pressure, such as wind force, air pressure changes, etc. At this time, the sealing structure needs to be able to expand to resist the external pressure and ensure the sealing effect. Especially for fixtures used outdoors, such as street lights, floodlights, etc., this adaptive ability is even more necessary; on the contrary, in a low-temperature environment, the sealing material may contract due to cold, and the adaptive sealing structure needs to be able to contract to adapt to the contraction of the material while maintaining sufficient sealing performance. In cold regions or winter, the internal temperature of the fixture chamber may drop significantly, and at this time, the contraction ability of the adaptive sealing structure is particularly important; when the fixture chamber faces a decrease in 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.

[0047] The cover plate 2 includes: 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 around the housing 1. The first temperature sensor 202 is set to control the liquid in the liquid storage tube 8 to flow into the first seal 4 when the ambient temperature around 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 is set to control the liquid in the liquid storage tube 8 to flow into the first seal 4 when the air pressure around the housing 1 is higher or lower than a preset value; the first temperature sensor 202 and the first air pressure sensor 203 are respectively used to detect the ambient temperature and air pressure around the housing 1. When these parameters exceed the preset values, they trigger the control of the transfer pump 801 and the heater 802. The heater 802 controls the heating wire 803 to heat the liquid in the liquid storage tube 8, and the transfer pump 801 sends the heated liquid into the first seal 4 to adjust the deformation change of the first seal 4. The intelligent design improves the response speed and adaptability of the sealing structure.

[0048] Dents 402 are formed at both the top and bottom of the first seal 4 to provide space for the expansion of the first seal 4.

[0049] The shape memory alloy 401 is oval and fits with the two dents 402 of the first seal 4.

[0050] The annular groove is opened on the outer ring of the cover plate 2, and the liquid storage pipe 8 is installed in the annular groove; the transfer pump 801 is installed in the annular groove, the water inlet end of the transfer pump 801 is connected to the liquid storage pipe 8, the water outlet end of the transfer pump 801 is connected to the first seal 4, the liquid storage pipe 8 is used to store liquid, and the transfer pump 801 is responsible for transporting the liquid into the first seal 4, so that the seal can be filled with liquid in real time as needed to adjust its sealing performance; the heater 802 is installed in the annular groove; the heating wire 803 is connected in the liquid storage pipe 8 and is connected to the heater 802, which is used to heat the liquid in the liquid storage pipe 8. The heater 802 and the heating wire 803 for heating the liquid in the liquid storage pipe 8 further enhance the self-adaptive ability of the seal, enabling it to maintain a stable sealing effect within a wider temperature range.

[0051] The second air pressure sensor 6 is installed in the housing 1 and is used to detect the air pressure in the housing 1; the second temperature sensor 7 is installed in the housing 1 and is used to detect the temperature in the housing 1.

[0052] The housing 1 includes: a plurality of grooves 103, formed on the inner wall of the housing 1 and distributed 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 moving grooves 111, formed at the bottom of the housing 1; a plurality of moving plates 108, respectively installed in the plurality of moving grooves 111, and one end of the moving plate 108 contacts the cover plate 2; a plurality of racks 109, respectively connected to the plurality of moving plates 108; a plurality of lead screws 106, respectively connected in the plurality of moving grooves 111, and one end of the lead screw 106 is connected to the piston head 105; a plurality of gears 107, respectively connected to the plurality of lead screws 106, and the gear 107 meshes with the rack 109. When the cover plate 2 is installed on the housing 1, it squeezes the plurality of moving plates 108. The moving plates 108 are squeezed to move in the moving grooves 111 and squeeze the elastic members 110. The moving plates 108 drive the racks 109 to move, the racks 109 drive the gears 107 to rotate, the gears 107 drive the lead screws 106 to rotate, and the lead screws 106 control the movement of the piston heads 105. The piston heads 105 suck the gas in the housing 1 into the grooves 103, and the gas enters the grooves 103 through the one-way valves 104, causing a negative pressure inside the housing 1 and adsorbing the sealing plate 3 on the second seal 5; a plurality of elastic members 110, one end of which is respectively connected to the inner walls of the plurality of moving grooves 111, and the other end is respectively connected to the plurality of moving plates 108. The elastic members 110 are made of stainless steel springs, or the elastic members 110 can also provide additional support and buffering for the moving plates 108, preventing damage or failure caused by excessive movement. It also helps to 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 pumped out to form a vacuum state, the air pressure difference inside and outside the chamber increases, making it more difficult for external gas to penetrate into the chamber. Vacuum pumping can reduce the number of gas molecules in the chamber, thereby reducing the leakage risk caused by the movement of gas molecules. Vacuum pumping can reduce the corrosion and oxidation of the gas in the chamber on the sealing structure, thereby extending the service life of the sealing structure.

[0053] Threaded grooves are formed on the inner wall of the housing 1, and the cover plate 2 is provided with threads. The cover plate 2 is connected to the threaded grooves on the housing 1 through the threads. The connection of the cover plate 2 to the threaded grooves on the housing 1 through the threads 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 penetrating into the lamp chamber through the connection.

[0054] The lamp board 102 is installed inside the housing 1; the radiator 101 is installed on the top of the housing 1 and is used to provide heat dissipation for the lamp board 102. The lamp board 102, as the core component of the lighting fixture, provides the necessary lighting function, while the radiator 101 ensures the stability and reliability of the lamp board 102 during long-term operation through its efficient heat dissipation performance. This design extends the service life of the lighting fixture and improves its overall performance.

[0055] During use, the lamp panel 102 of the lighting fixture is installed inside the housing 1, the sealing plate 3 is installed inside the housing 1 for sealing the lighting fixture, the cover plate 2 is connected to the threaded groove on the housing 1 by threads. During the connection process, the cover plate 2 presses the moving plate 108, and the moving plate 108 moves in the moving groove 111 and presses the elastic member 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 screw rod 106 to rotate, and the screw rod 106 controls the movement of the piston head 105. The piston head 105 pumps the gas inside the housing 1 into the groove 103 opened on the inner wall of the housing 1. The gas enters the groove 103 through the one-way valve 104, creating a negative pressure inside the housing 1 and adsorbing the sealing plate 3 onto the second sealing member 5, enhancing the sealing effect. The first sealing member 4 and the second sealing member 5 are respectively installed between the sealing plate 3 and the cover plate 2, and between the housing 1 and the sealing plate 3 to ensure 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 member 4 and the shape memory alloy 401 provided inside it can expand or contract according to the change of the ambient temperature, adaptively adjusting the sealing effect. The first temperature sensor 202 and the second temperature sensor 7 respectively detect the ambient temperature around and inside the housing 1, and the first pressure sensor 203 and the second pressure sensor 6 respectively detect the air pressure around and inside the housing 1. When these parameters (temperature or air pressure) exceed the preset values, the control of the delivery pump 801 and the heater 802 is triggered. The heater 802 heats the liquid in the liquid storage tube 8 through the heating wire 803, and the delivery pump 801 sends the heated liquid into the first sealing member 4. The shape memory alloy 401 deforms when heated and drives the first sealing member 4 to expand to adjust its deformation and enhance the sealing effect. The liquid storage tube 8 is installed in the annular groove of the cover plate 2 for storing the liquid. When it is necessary to adjust the sealing performance of the first sealing member 4, the delivery pump 801 sends the liquid in the liquid storage tube 8 into the first sealing member 4. Dents 402 are formed at both the top and bottom of the first sealing member 4 to provide space for the expansion of the first sealing member 4. The shape memory alloy 401 is oval and fits with these dents 402 to further enhance the sealing effect. The radiator 101 is installed on the top of the housing 1 to dissipate heat for the lamp panel 102, ensuring the stability and reliability of the lamp panel 102 during long-term operation. The system continuously monitors the ambient temperature and air pressure around and inside the housing 1, and adjusts the sealing performance of the first sealing member 4 in a timely manner according to the monitoring results. Each component is regularly inspected and maintained to ensure the stability and reliability of the entire sealing structure.

[0056] By using the first seal 4 containing the shape memory alloy 401, this solution achieves the adaptive expansion and contraction of the seal in extreme temperature environments. The shape memory alloy 401 can automatically adjust its shape according to the change of the ambient temperature, maintain a uniform stress distribution at the sealing interface, and effectively avoid the sealing failure problem caused by thermal expansion and contraction.

[0057] The combined use of the first seal 4 and the second seal 5, as well as their tight fit with the outer shell 1 and the sealing plate 3, significantly enhances the reliability of the sealing structure. The multiple-seal design can effectively prevent external pollutants such as gases, moisture, and dust from entering the lamp chamber, ensuring the normal operation and long-term stability of the lamp.

[0058] This solution introduces intelligent components such as the first temperature sensor 202, the first pressure sensor 203, the delivery pump 801, and the heater 802, which can perform real-time monitoring and response according to the changes in the ambient temperature and air pressure around and inside the outer shell 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.

[0059] Through the negative pressure state generated during the installation of the cover plate 2 and the design of the air pressure regulating mechanisms such as the piston head 105 and the one-way valve 104, the influence of the air pressure difference inside and outside the chamber on the sealing effect is effectively addressed. It can ensure that when the air pressure difference changes, the sealing structure can still maintain stable sealing performance and prevent external gases from penetrating into the chamber. The sealing structure not only enhances the explosion-proof performance of the lighting fixture but also improves the safety of the overall structure through an intelligent monitoring and response mechanism, ensuring the safety of the fixture and the surrounding environment in extreme environments and reducing the safety risks caused by sealing failure.

[0060] Finally, several 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 "coupling" should be understood in a broad sense. It can be a mechanical connection or an electrical connection, or the internal communication of two components. It can be directly connected. "Up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change;

[0061] Second, in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0062] Finally, the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flameproof lighting fixture chamber sealing structure, characterized in that: include: A housing (1) for mounting a lighting fixture; A sealing plate (3) installed in the housing (1) and used for sealing the lighting fixture; A cover plate (2) is mounted on the bottom of the outer shell (1) and is used to fix the position of the sealing plate (3) in the outer shell (1); the cover plate (2) is configured to draw gas in the outer shell (1) to a negative pressure state when inserted into the outer shell (1); A first sealing member (4) is installed between the sealing plate (3) and the cover plate (2) and is used for sealing the connection between the cover plate (2) and the sealing plate (3); A second sealing member (5) is installed between the housing (1) and the sealing plate (3) and is used to seal the connection between the housing (1) and the sealing plate (3); A liquid storage pipe (8), mounted on the cover plate (2) and used for storing liquid; The first sealing member (4) is in the form of a hollow annular structure, and a plurality of shape memory alloys (401) are arranged inside the first sealing member, which are distributed in a circumferential array and are configured to deform when heated or cooled, so as to drive the first sealing member (4) to expand or contract; The cover plate (2) comprises: An explosion-proof plate (201), mounted on the cover plate (2), for providing explosion-proof protection for the lighting fixture; a first temperature sensor (202) mounted on the cover plate (2) and used to detect the ambient temperature of the housing (1); the first temperature sensor (202) being configured to control the liquid in the liquid storage tube (8) to flow into the first sealing element (4) when the ambient temperature of the housing (1) is higher than or lower than a preset value; A first air pressure sensor (203) is mounted on the cover plate (2) and is used to detect the air pressure around the housing (1). The first air pressure sensor (203) is configured 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 at or below a preset value.

2. The explosion-proof lighting fixture chamber sealing structure according to claim 1, characterized in that: The top and bottom of the first sealing member (4) are both formed with recesses (402) for providing space for the first sealing member (4) to expand.

3. The explosion-proof lighting fixture chamber sealing structure according to claim 2, characterized in that: The shape memory alloy (401) is elliptical and fits into two recesses (402) of the first sealing member (4).

4. The explosion-proof lighting fixture chamber sealing structure according to claim 1, characterized in that: Also includes: An annular groove is provided on the outer ring of the cover plate (2), and the liquid storage pipe (8) is installed in the annular groove; A delivery pump (801) is installed in the annular groove, wherein the water inlet end of the delivery pump (801) is connected to the liquid storage pipe (8), and the water outlet end of the delivery pump (801) is connected to the first sealing member (4); A heater (802) is installed in the annular groove; The heating wire (803) is connected inside the liquid storage tube (8) and connected to the heater (802) and is used to heat the liquid in the liquid storage tube (8).

5. The explosion-proof lighting fixture chamber sealing structure according to claim 1, characterized in that: Also includes: A second air pressure sensor (6), installed in the housing (1) and used to detect the air pressure in the housing (1); A second temperature sensor (7) is installed in the housing (1) and is used to detect the temperature inside the housing (1).

6. The explosion-proof lighting fixture chamber sealing structure according to claim 1, characterized in that: The housing (1) comprises: A plurality of grooves (103) are formed on the inner wall of the housing (1) and are distributed in a circular array; A plurality of one-way valves (104) are respectively installed in the plurality of grooves (103); A plurality of piston heads (105) are respectively connected in a plurality of grooves (103).

7. The explosion-proof lighting fixture chamber sealing structure according to claim 6, characterized in that: The housing (1) further comprises: A plurality of movable grooves (111) are provided at the bottom of the housing (1); A plurality of movable plates (108) are respectively installed in a plurality of movable grooves (111), and one end of the movable plate (108) is in contact with the cover plate (2); A plurality of racks (109) are respectively connected to a plurality of movable plates (108); A plurality of screw rods (106) are respectively connected to a plurality of movable grooves (111), and one end of the screw rod (106) is connected to the piston head (105); A plurality of gears (107) are respectively connected to a plurality of screw rods (106), and the gears (107) are meshed with racks (109).

8. The explosion-proof lighting fixture chamber sealing structure according to claim 7, characterized in that: The housing (1) further comprises: A plurality of elastic members (110) have one end connected to the inner walls of a plurality of movable grooves (111) and the other end connected to a plurality of movable plates (108).

9. The explosion-proof lighting fixture chamber sealing structure according to claim 1, characterized in that: A thread groove is formed on the inner wall of the outer shell (1), and a thread is provided on the cover plate (2). The cover plate (2) is connected to the thread groove on the outer shell (1) via the thread.

10. The explosion-proof lighting fixture chamber sealing structure according to claim 1, characterized in that: Also includes: A light panel (102) is installed in the housing (1); A heat sink (101) is installed on the top of the housing (1) and is used to provide heat dissipation for the light panel (102).

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