Electrochromic glass and negative pressure furnace sight glass based on electrochromic glass

Abstract

The present application relates to the technical fields of boiler equipment, and discloses an electrochromic glass, which comprises a first high-transmittance high-temperature-resistant layer, an ultraviolet-proof layer, a functional laminated layer, a second high-transmittance high-temperature-resistant layer and a high-transmittance explosion-proof layer arranged in sequence; and a negative pressure furnace fire watching device based on the electrochromic glass, which comprises the electrochromic glass and a compressed air blowing device, the electrochromic glass is matched with the shape of a fire watching hole, and the electrochromic glass is fixed through a supporting frame; the compressed air blowing device is integrated on the supporting frame and is used for removing impurities in the fire watching channel, the electrochromic glass is used as a fireproof barrier, the electrochromic glass can ensure that the fire watcher will not be scalded when the furnace negative pressure is unstable, the radiation during the fire watching is reduced, the fire watcher can clearly judge the combustion and coking conditions in the furnace under different ambient light intensities, and the compressed air blowing device is arranged to remove the accumulated ash in the fire watching channel, so that the fire watching effect is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler equipment, in particular to an electrochromic glass and a negative pressure furnace viewing device based on the electrochromic glass. BACKGROUND

[0002] The industrial boiler viewing hole in a thermal power plant is a device attached to the boiler, which mainly facilitates the staff to estimate the temperature and combustion condition in the boiler by observing the color of the flame, and can directly judge the coking condition of the tube wall in the furnace through the viewing hole.

[0003] The boiler in a thermal power plant is generally a negative pressure furnace, and the commonly used boiler viewing device is relatively simple, the viewing hole channel is directly communicated with the furnace without sealing, and the viewing hole hole is locked by a cover door during normal operation. At present, the general viewing method is to directly open the cover door of the viewing hole after checking the stable negative pressure of the furnace, and the high-temperature flue gas and fly ash generated during the combustion in the furnace will be disturbed by the working condition in the furnace, and will be accumulated in the channel on the inner side of the cover door of the viewing hole, which will seriously affect the viewing effect after the cover door of the viewing hole is opened. In addition, there is no any isolation barrier between the viewer and the dangerous source in the furnace, which has low safety, and the strong light and radiation light generated in the negative pressure furnace will also cause certain damage to the eyes.

[0004] The electrochromic glass is a special material that changes the optical properties of the glass by controlling the external voltage value, changes the transmittance and reflectance of the glass by the size of the external voltage value, causes stable and reversible physical reaction of the glass, changes the ion action in the glass under the action of the external voltage value, and controls the light intensity of the transmitted and reflected glass. The conventional electrochromic glass is mostly composed of base glass, transparent conductive layer, electrochromic layer, ion conductor layer, ion storage layer, transparent conductive layer and base glass. Even if it is applied to the viewing device of the negative pressure furnace in the thermal power plant, it cannot resist the high-temperature environment of the negative pressure furnace, and cannot effectively avoid the damage of the light in the negative pressure furnace to the eyes.

[0005] Therefore, how to provide a color-changing glass applicable to the viewing device of the negative pressure furnace and a negative pressure furnace viewing device containing the color-changing glass is a technical problem that those skilled in the art urgently need to solve. SUMMARY

[0006] Therefore, how to provide a color-changing glass applicable to the viewing device of the negative pressure furnace and a negative pressure furnace viewing device containing the color-changing glass is a technical problem that those skilled in the art urgently need to solve.

[0007] The first object of the present application is to provide an electrochromic glass, by changing the structure of the electrochromic glass and further changing the light penetration characteristics of the electrochromic glass, to ensure that the observer can clearly judge the combustion and coking conditions in the furnace under different ambient light intensities.

[0008] The second object of the present application is to provide a negative pressure furnace viewing device based on the electrochromic glass, using the electrochromic glass as a fireproof barrier to ensure that the observer will not be scalded when the furnace hearth negative pressure is unstable, reduce the radiation when observing, and ensure that the observer can clearly judge the combustion and coking conditions in the furnace under different ambient light intensities; and by setting a compressed air purging device to remove the accumulated ash in the viewing channel, to ensure the viewing effect.

[0009] Therefore, in one aspect, the present application provides an electrochromic glass, comprising a first high-transparency high-temperature-resistant layer, an ultraviolet-proof layer, a functional stack, a second high-transparency high-temperature-resistant layer and a high-transparency explosion-proof layer arranged in sequence; the first high-transparency high-temperature-resistant layer, the ultraviolet-proof layer, the functional stack, the second high-transparency high-temperature-resistant layer and the high-transparency explosion-proof layer are connected in series in a control circuit, and the optical properties of the glass are changed by controlling the applied voltage value.

[0010] Preferably, in the above-mentioned electrochromic glass, the first high-transparency high-temperature-resistant layer and the second high-transparency high-temperature-resistant layer are both quartz glass.

[0011] Preferably, in the above-mentioned electrochromic glass, the ultraviolet-proof layer is used to absorb ultraviolet rays in the 200-400 nm wavelength band.

[0012] Preferably, in the above-mentioned electrochromic glass, the functional stack comprises a first transparent conductive layer connected to the ultraviolet-proof layer, and an electrochromic layer, an ion conductor layer, an ion storage layer and a second transparent conductive layer connected in sequence to the first transparent conductive layer, and the second transparent conductive layer is connected to the second high-transparency high-temperature-resistant layer.

[0013] Preferably, in the above-mentioned electrochromic glass, the electrochromic glass comprises a shielding portion and a flow guide cover, the flow guide cover is formed by the shielding portion extending outwardly, and the shielding portion and the flow guide cover form an angle of 90-180°, further preferably 100-160°; the flow guide cover forms an angle of 60-80° with the horizontal plane, further preferably 65°.

[0014] On the other hand, the present application also provides a negative pressure furnace viewing device based on an electrochromic glass, comprising an electrochromic glass and a compressed air purging device;

[0015] The electrochromic glass is matched with the shape of the viewing hole, and is fixed by a support frame; the compressed air purging device is integrated on the support frame and is used to remove impurities in the viewing channel.

[0016] Preferably, in the above-mentioned negative pressure furnace fire watching device based on electrochromic glass, the compressed air blowing device comprises a compressed air blowing hole and a compressed air pipe.

[0017] The compressed air blowing hole is arranged on the support frame, and the compressed air pipe is used to introduce compressed air to the compressed air blowing hole.

[0018] Preferably, in the above-mentioned negative pressure furnace fire watching device based on electrochromic glass, a control module is further included for controlling the movement of the electrochromic glass and the fire watching mode.

[0019] Preferably, in the above-mentioned negative pressure furnace fire watching device based on electrochromic glass, the control module comprises a cover, a rotating shaft mechanism and a control box.

[0020] The electrochromic glass is located in the cover in an unused state, the rotating shaft mechanism is connected with the cover and is used to support and fix the support frame, the support frame is used to fix the electrochromic glass and drive the electrochromic glass to move to the fire watching hole, and the control box is arranged on the cover and is connected with the control circuit and used to control the fire watching mode.

[0021] Preferably, in the above-mentioned negative pressure furnace fire watching device based on electrochromic glass, the rotating shaft mechanism comprises a hand wheel operating mechanism and a hand wheel screw rod.

[0022] The hand wheel operating mechanism is arranged on the outer surface of the cover, the end of the wheel rod of the hand wheel operating mechanism is connected with a threaded gear, one end of the hand wheel screw rod is connected with the hand wheel operating mechanism through the threaded gear, and the other end is fixed to the support frame through a connecting seat, the hand wheel screw rod is driven to move by rotating the hand wheel operating mechanism, and the electrochromic glass fixed to the support frame is driven to move between the fire watching hole and the cover.

[0023] Preferably, in the above-mentioned negative pressure furnace fire watching device based on electrochromic glass, the control box is provided with a plurality of keys, including a main switch, a fire watching mode, a focus watching mode, a manual adjustment mode and a blowing mode.

[0024] The present application provides an electrochromic glass and a negative pressure furnace fire watching device based on the electrochromic glass, which has the beneficial effects compared with the prior art in that:

[0025] (1) The electrochromic glass of the present application can effectively block strong light and radiant light from damaging the eyes, especially the ultraviolet light at 320 nm which is harmful to the eyes, and has good transparency, stability, weather resistance and high temperature resistance, is easy to dye, easy to process and has a good appearance, the light penetration characteristics of the electrochromic glass can be changed by controlling the voltage value, so that the observer can clearly judge the combustion and coking in the furnace under different environmental light intensities;

[0026] (2) In the negative pressure furnace viewing device of the present application, the electrochromic glass is used as a fireproof barrier to ensure that the observer will not be scalded when the furnace hearth negative pressure is unstable, and to reduce the radiation when observing the fire; the color of the electrochromic glass can be adjusted by controlling the voltage, and then the color depth and light transmittance of the viewing device can be adjusted, so that the observer can clearly judge the combustion and coking in the furnace under different environmental light intensities;

[0027] (3) The electrochromic glass of the present application uses a rotating shaft mechanism for position adjustment, so that the electrochromic glass moves between the cover shell and the viewing hole, and has strong compatibility with the viewing hole, without changing the original negative pressure furnace viewing hole structure, and has wide application range and high safety;

[0028] (4) In the negative pressure furnace viewing device of the present application, a compressed air purging device is arranged to remove the accumulated dust in the viewing channel before viewing, to ensure the viewing effect, and the viewing process and viewing mode can be adjusted by the control module, realizing the visual optimization of viewing and the automation of the viewing process. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the layered structure of the electrochromic glass of the embodiment of the present application Figure 1 ;

[0030] Figure 2 is a schematic diagram of the layered structure of the electrochromic glass of the embodiment of the present application Figure 2 ;

[0031] Figure 3 is a schematic diagram of the control circuit of the present application;

[0032] Figure 4 is a schematic diagram of the overall structure of the electrochromic glass of the embodiment of the present application;

[0033] Figure 5 is a schematic diagram of the overall structure of the viewing device of the embodiment of the present application;

[0034] Figure 6 is a schematic diagram of the viewing hole structure in the embodiment of the present application.

[0035] 1 is electrochromic glass, 11 is first high-transmittance high-temperature-resistant layer, 12 is ultraviolet-proof layer, 13 is functional stack, 131 is first transparent conductive layer, 132 is electrochromic layer, 133 is ion conductor layer, 134 is ion storage layer, 135 is second transparent conductive layer, 14 is second high-transmittance high-temperature-resistant layer, 15 is high-transmittance explosion-proof layer, 16 is shielding part, 17 is flow guide cover;

[0036] 2 is compressed air blowing hole, 3 is compressed air pipe, 4 is cover shell, 51 is hand wheel operating mechanism, 52 is hand wheel screw rod, 53 is connecting seat, 6 is control box, 61 is total switch button, 62 is fire watching mode button, 63 is focus watching mode button, 64 is manual adjustment mode button, 65 is blowing mode button, 7 is supporting frame, 8 is fire watching hole, 9 is cover plate door. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0038] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0039] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] Example 1

[0042] Reference Figure 1-4. This embodiment provides an electrochromic glass, including a first high-transparency and high-temperature resistant layer 11, an ultraviolet-resistant layer 12, a functional stack 13, a second high-transparency and high-temperature resistant layer 14, and a high-transparency explosion-proof layer 15 arranged sequentially; the first high-transparency and high-temperature resistant layer 11, the ultraviolet-resistant layer 12, the functional stack 13, the second high-transparency and high-temperature resistant layer 14, and the high-transparency explosion-proof layer 15 are connected in series in a control circuit, and the optical properties of the glass are changed by controlling the applied voltage value.

[0043] The electrochromic glass of this invention has good transparency, stability and weather resistance, is easy to dye and process, and has a beautiful appearance.

[0044] Specifically, quartz glass has a light transmittance of up to 92%, allowing complete transmission of ultraviolet light, while ordinary glass only transmits 0.6% of ultraviolet light. The electrochromic glass of this invention uses quartz glass as a high-transmittance, high-temperature-resistant layer, achieving an ultraviolet transmittance of 73%, thus exhibiting high transparency. The electrochromic glass has a relative molecular mass of approximately 2 million, making it a long-chain polymer compound. Furthermore, the chains forming the molecules are very flexible, resulting in high strength and tensile and impact resistance 7-18 times higher than ordinary glass. The density of the electrochromic glass is 1.18 g / cm³. 3 For the same size material, its weight is only half that of ordinary glass and 43% that of metallic aluminum; electrochromic glass is easy to process and can be cut or drilled using lathes, drilling machines, etc.

[0045] In some embodiments of the present invention, the first high-transparency and high-temperature resistant layer 11 and the second high-transparency and high-temperature resistant layer 14 are both quartz glass.

[0046] Quartz glass is a high-purity special industrial glass containing only silicon dioxide. Due to its unique properties that cannot be replaced by other materials—namely, very low thermal conductivity, good thermal shock resistance, high deformation and softening temperatures, very low thermal conductivity, very low dielectric loss, and optical transmittance over a wide spectral range from ultraviolet to infrared—it plays a vital role in modern industry and high-tech fields.

[0047] High temperature resistance: The softening point of quartz glass is about 1730℃, and it can be used for a long time at 1100℃. The highest short-term operating temperature can reach 1450℃.

[0048] Corrosion resistance: Except for hydrofluoric acid, quartz glass hardly reacts with other acidic substances. Its acid resistance is 30 times that of ceramics and 150 times that of stainless steel. In particular, its chemical stability at high temperatures is unmatched by any other engineering material.

[0049] Thermal stability: quartz glass has a small thermal expansion coefficient and can withstand severe temperature changes. When heated to about 1100℃, the quartz glass will not burst when placed in normal temperature water.

[0050] Transparency: Quartz glass has good light transmission performance in the entire spectrum from ultraviolet to infrared. The visible light transmittance is above 93%, and the transmittance in the ultraviolet spectrum is above 80%.

[0051] Electrical insulation: The resistance of quartz glass is 10,000 times that of ordinary glass, making it a good electrical insulator. It also has good electrical properties at high temperatures.

[0052] In some embodiments of the present application, the anti-ultraviolet layer 12 is used to absorb ultraviolet light in the 200-400 nm band, effectively preventing the harmful effects of strong light and radiation in the negative pressure furnace on the eyes.

[0053] Specifically, the anti-ultraviolet layer 12 of the present application is processed from anti-ultraviolet plastic masterbatch, which is prepared by filling the ultraviolet absorber through nanodispersion.

[0054] Referring to Figure 2 In some embodiments of the present application, the functional stack 13 includes a first transparent conductive layer 131 connected to the anti-ultraviolet layer 12, and an electrochromic layer 132, an ion conductor layer 133, an ion storage layer 134, and a second transparent conductive layer 135 connected in sequence to the first transparent conductive layer 131, and the second transparent conductive layer 135 is connected to the second high-transparency high-temperature-resistant layer 14.

[0055] Referring to Figure 4 In some embodiments of the present application, the electrochromic glass includes a shielding portion 16 and a flow guide cover 17, the flow guide cover 17 is formed by extending outward from the shielding portion 16, and the shielding portion 16 and the flow guide cover 17 form an angle of 90-180°, and further preferably 100-160°; the flow guide cover 17 forms an angle of 60-80° with the horizontal plane, and further preferably 65°.

[0056] When the electrochromic glass is used in the negative pressure furnace viewing device, the flow guide cover 17 acts as a fireproof guide device to prevent the flame from being ejected outward when the viewing hole 8 is spewing fire, thereby preventing personal injury.

[0057] Furthermore, the inner side of the flow guide cover 17 is provided with a plurality of flow guide fins in stripe or other shapes to accelerate the degree of flow guidance.

[0058] In some embodiments of the present application, the control circuit is as shown in Figure 3 The resistance change of RL1 is used to change the feedback voltage value in the power supply circuit of the electrochromic glass, directly changing the power supply voltage value of the electrochromic glass, achieving the corresponding effect.

[0059] Specifically, in the control circuit:

[0060] VIN is the input power voltage of the electrochromic glass;

[0061] U1 is a voltage conversion chip;

[0062] R1 and R2 are feedback resistors of the voltage conversion chip;

[0063] RL1 is an adjustable resistor;

[0064] Vfb is the internal voltage value of the U1 module;

[0065] VOUT is the output power voltage of the electrochromic glass;

[0066] and VOUT = (1 + R1 / (R2 + RL1)) * Vfb

[0067] wherein R1 and R2 are fixed resistance values, and Vfb is a fixed value inside U1. If the resistance value of RL1 becomes smaller, the voltage value of VOUT changes according to the above formula, forming a voltage increase, VOUT becomes higher, resulting in the color of the electrochromic glass becoming deeper, and the feedback effect of shielding strong light is formed.

[0068] Embodiment 2

[0069] With reference to Figure 3 -5, the embodiment provides a negative pressure furnace viewing device based on electrochromic glass, which comprises electrochromic glass 1 and a compressed air blowing device; wherein the electrochromic glass 1 is matched with the shape of the viewing hole 8; the compressed air blowing device is integrated on the electrochromic glass 1 and is used for removing impurities in the viewing channel.

[0070] Specifically, the shielding part 16 of the electrochromic glass 1 is matched with the shape of the viewing hole 8, and the flow guide cover 17 is directed to one side of the viewing hole 8, which can prevent the flame from being ejected outward along the viewing hole 8 when the flame is ejected, and can avoid personal injury.

[0071] In some embodiments of the present application, the compressed air blowing device comprises a compressed air blowing hole 2 and a compressed air pipe 3; wherein the compressed air blowing hole 2 is arranged on the support frame 7, and the electrochromic glass 1 is fixed through the support frame 7; the compressed air pipe 3 is used for guiding compressed air into the compressed air blowing hole 2.

[0072] Specifically, the number of compressed air blowing holes 2 is set according to actual conditions; the support frame 7 can be a cast iron frame, and a hollow passage is arranged on the inner side of the support frame 7 for accommodating the compressed air pipe 3; one end of the compressed air pipe 3 is connected to a compressed air storage tank, and the other end penetrates through the hollow passage and is connected to the compressed air blowing hole 2; external compressed air passes through the compressed air pipe 3 to the compressed air blowing hole 2 to process the accumulated ash of the fire observation passage in the furnace of the fire observation device, so as to avoid the influence of the accumulated ash on the fire observation effect.

[0073] In some embodiments of the present application, a control module is further included for controlling the movement of the electrochromic glass 1 and the fire observation mode.

[0074] In some embodiments of the present application, the control module includes a cover 4, a rotating shaft mechanism and a control box 6.

[0075] In some embodiments of the present application, the electrochromic glass 1 is located in the cover 4 in the unused state, and when observation is needed, the support frame 7 is driven by the rotating shaft mechanism to drive the electrochromic glass 1 to move in front of the fire observation hole 8, and then the situation in the fire observation passage is observed through the electrochromic glass 1; the rotating shaft mechanism is connected with the cover 4, and the rotating shaft mechanism and the support frame 7 are connected through a connecting seat 53 for supporting and fixing the electrochromic glass 1 and driving the electrochromic glass 1 to move to the fire observation hole 8; the control box 6 is arranged on the cover 4, and the control box 6 is connected with a control circuit for controlling the fire observation mode.

[0076] In some embodiments of the present application, the rotating shaft mechanism includes a hand wheel operating mechanism 51 and a hand wheel screw rod 52, which are applications of common rotating shaft mechanisms on the market.

[0077] The hand wheel operating mechanism 51 is arranged on the outer surface of the cover 4, and the end of the wheel lever of the hand wheel operating mechanism 51 is connected with a threaded gear; one end of the hand wheel screw rod 52 is connected with the hand wheel operating mechanism 51 through the threaded gear, and the other end is fixed to the support frame 7 through the connecting seat 53; the hand wheel screw rod 52 is fixed to the support frame 7 through screws; the hand wheel operating mechanism 51 drives the hand wheel screw rod 52 to move, and then drives the electrochromic glass 1 fixed to the support frame 7 to move between the fire observation hole 8 and the cover 4;

[0078] In the case of not using the electrochromic glass 1, the electrochromic glass 1 is hidden in the cover 4 and is fixed to the support frame 7; the support frame 7 controls the hand wheel screw rod 52 through the hand wheel operating mechanism 51 to change the extension length of the hand wheel screw rod 52, and then moves the electrochromic glass 1 to the front of the fire observation hole 8, fully covering the fire observation hole 8 but leaving a gap without sealing.

[0079] In some embodiments of the present application, the control box 6 is provided with a plurality of buttons, including a total switch button 61, a fire watching mode button 62, a focus watching mode button 63, a manual adjustment mode button 64, and a purge mode button 65.

[0080] The fire watching mode and the focus watching mode are fixed parameter modes selected after calculation of the intensity of the flame light; the purge mode is a purge solenoid control button, and the observation channel can be purged after the purge mode button 65 on the control box 6 is pressed to turn on the solenoid control button.

[0081] In summary, the embodiments of the present application provide an electrochromic glass and a negative pressure furnace fire watching device based on the electrochromic glass, which can achieve the following purposes:

[0082] (1) The fire watching device provided by the direct boiler is a hole opened on the direct furnace wall, and a sealing door is installed. The fire watching method is to directly open the door to watch the fire after checking the stable negative pressure of the furnace chamber, and there is no barrier between the observer and the dangerous source in the furnace chamber, which poses a safety risk. The fire watching device of the present application is provided with a fireproof barrier at the fire watching hole to ensure that the observer will not be scalded when the negative pressure of the furnace chamber is unstable, and greatly reduces the heat radiation during fire watching;

[0083] (2) When the furnace is burning, the high-temperature flue gas and fly ash will be disturbed along with the working condition in the furnace, and a large amount of ash and slag will accumulate in the channel on the inner side of the cover door of the fire watching hole. After the cover door of the fire watching hole is opened, the accumulated ash will affect the fire watching. The fire watching device of the present application is provided with a compressed air purging device to remove the accumulated ash in the fire watching channel before the fire is turned off.

[0084] (3) The strong light and radiation light in the traditional direct fire watching process can cause harm to the eyes; the fire watching device of the present application is provided with a rotating shaft type electrochromic glass fire watching mirror, and the adjustment button operation control chip changes the electrical properties of the electrode, thereby changing the light transmission properties of the electrochromic light shielding lens, ensuring that the observer can clearly judge the burning and coking conditions in the furnace under different environmental light intensities, and effectively blocking the strong light and radiation light from harming the eyes, especially the ultraviolet light at 320 nm which is harmful to the eyes.

[0085] (4) The edge of the electrochromic glass of the present application is outwardly convex, serving as a fireproof guide piece, which can prevent the flame from being ejected outwardly along the observation hole when the flame is spouting, thereby avoiding injury.

[0086] The above description is only the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present application, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A negative pressure furnace sight glass based on electrochromic glass, characterized in that, The utility model relates to an electrically variable glass, which is matched with the shape of a fire hole and is fixed by a support frame. A compressed air blowing device is integrated on the support frame to remove impurities in the fire hole. The electrically variable glass comprises a first high-transparency and high-temperature-resistant layer, an ultraviolet-proof layer, a functional layer, a second high-transparency and high-temperature-resistant layer, and a high-transparency and explosion-proof layer arranged in sequence. The first and second high-transparency and high-temperature-resistant layers are both quartz glass. The ultraviolet-proof layer is used to absorb ultraviolet rays in the 200-400 nm wavelength band. The functional layer comprises a first transparent conductive layer connected with the ultraviolet-proof layer, and an electrochromic layer, an ion conductor layer, an ion storage layer, and a second transparent conductive layer connected with the first transparent conductive layer in sequence. The electrically variable glass comprises a shielding part and a flow guide cover, which is formed by extending outward from the shielding part, and the angle between the shielding part and the flow guide cover is 90-180°. The compressed air blowing device comprises:

2. The electrochromic glass-based negative pressure fire sight glass according to claim 1, characterized in that, A compressed air blowing hole is arranged on the support frame. A compressed air pipe is used to introduce compressed air into the compressed air blowing hole. The control module comprises:

3. The electrochromic glass-based negative pressure fire looking device of claim 1, wherein, A cover, in which the electrically variable glass is located in the non-use state. A rotating shaft mechanism is connected with the cover to move the electrically variable glass to the fire hole. A control box is arranged on the cover and is connected with the control circuit to control the fire watching mode. The rotating shaft mechanism comprises:

4. The electrochromic glass-based negative pressure fire sight glass according to claim 3, characterized in that, A hand wheel operating mechanism is arranged on the outer surface of the cover, and the end of the wheel lever of the hand wheel operating mechanism is connected with a threaded gear. A hand wheel screw rod is connected with the hand wheel operating mechanism at one end through the threaded gear and is fixed to the support frame at the other end. The electrically variable glass fixed to the support frame is moved between the fire hole and the cover by rotating the hand wheel operating mechanism to drive the hand wheel screw rod to move.

5. The electrochromic glass-based negative pressure fire sight glass according to claim 3, wherein The control box is provided with multiple keys, including a main switch, a fire watching mode, a focus watching mode, a manual adjustment mode, and a blowing mode.

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