An explosion-proof air volume control system and an explosion-proof exhaust fan

Abstract

This utility model discloses an explosion-proof airflow control system and an explosion-proof exhaust cabinet. The explosion-proof airflow control system includes: a flameproof box with a first interface and a second interface, the flameproof box defining a flameproof cavity; a controller disposed in the flameproof cavity; a safety barrier disposed in the flameproof cavity, connected to the controller, and used for connection to an intrinsically safe explosion-proof device through the second interface; an explosion-proof airflow regulating valve including an explosion-proof actuator with a first cable; and an explosion-proof connector, the first cable passing through the explosion-proof connector and electrically connected to the controller through the first interface. This utility model uses a combination of a controller within a flameproof box and an explosion-proof airflow regulating valve, which not only balances explosion-proof safety and energy saving but also improves exhaust stability.

Description

Technical Field

[0001] This utility model relates to the field of fume hood technology, and in particular to an explosion-proof air volume control system and an explosion-proof fume hood. Background Technology

[0002] Explosion-proof fume hoods are mainly used in environments containing flammable and explosive gases, volatile combustible solvents, or dust. Currently, most explosion-proof fume hoods on the market use manual valves or mechanical constant air volume valves, which do not involve electrical devices and do not have airflow regulation functions.

[0003] Variable air volume (VAV) fume hood systems overcome the shortcomings of traditional constant air volume (CAV) systems. By precisely calculating the exhaust volume and dynamically adjusting the dampers, they ensure a uniform and stable face velocity (e.g., a constant 0.5 m / s) at the viewing window opening, preventing localized excessively low or high velocities. This completely blocks the escape path of harmful media from within the hood, fundamentally protecting operator safety. In contrast, constant air volume (CAV) valves have a fixed exhaust volume. The smaller the viewing window opening, the higher the face velocity, resulting in rapid airflow within the hood, unstable airflow organization, and a higher risk of contaminant leakage. This compromises operator safety and leads to higher energy consumption.

[0004] Therefore, existing technologies lack an explosion-proof airflow control system that can be applied to explosion-proof fume hoods, and it urgently needs improvement. Utility Model Content

[0005] The purpose of this invention is to solve the problems of existing explosion-proof fume hoods where the constant air volume valve lacks air volume regulation, resulting in high energy consumption and the risk of pollutant leakage. This invention provides an explosion-proof air volume control system and an explosion-proof fume hood. The explosion-proof air volume control system, through the connection of an explosion-proof controller and the explosion-proof actuator of the explosion-proof air volume regulating valve, not only balances explosion-proof safety and energy saving but also improves exhaust stability and reduces energy consumption.

[0006] To solve the above-mentioned technical problems, the present invention discloses an explosion-proof air volume control system, comprising: an explosion-proof box having a first interface and a second interface, wherein the explosion-proof box defines an explosion-proof cavity;

[0007] The controller is located in the explosion-proof cavity;

[0008] A safety barrier is disposed in the explosion-proof cavity. The safety barrier is connected to the controller and is used to connect to an intrinsically safe explosion-proof device through the second interface.

[0009] An explosion-proof air volume regulating valve includes an explosion-proof actuator, the explosion-proof actuator having a first cable;

[0010] An explosion-proof connector is provided, in which the first cable passes and is electrically connected to the controller via the first interface.

[0011] By adopting the above technical solution, the embodiments of this application enclose all components that may ignite an explosive gas mixture (such as a controller) in a shell (i.e., an explosion-proof box). The explosion-proof box can withstand the explosion of flammable mixtures that penetrate into the interior of the explosion-proof box through any joint surface or structural gap without damage, and will not cause ignition of the explosive atmosphere formed outside. That is, the explosion-proof box is explosion-resistant and does not propagate the explosion.

[0012] Furthermore, the explosion-proof air volume control system of this application embodiment connects high-voltage electrical equipment (which may generate electric sparks, such as the explosion-proof actuator of the explosion-proof air volume regulating valve, etc.) to the controller in the explosion-proof box through explosion-proof connectors. On the other hand, it provides the energy-constrained electrical signal to an intrinsically safe explosion-proof device (such as an explosion-proof displacement sensor or an explosion-proof touch screen, etc.) that can operate under safe voltage and current through a safety barrier, thus achieving overall explosion protection. It is an explosion-proof and intrinsically safe electrical device that not only takes into account explosion-proof safety and reduces energy consumption, but also improves exhaust stability by controlling the exhaust volume through the controller and the explosion-proof air volume regulating valve.

[0013] According to another specific embodiment of the present invention, an explosion-proof air volume control system is disclosed, wherein the number of safety barriers includes a plurality of second interfaces, and the plurality of safety barriers correspond to the plurality of second interfaces respectively; wherein the plurality of safety barriers are spaced apart in the explosion-proof cavity, each safety barrier has a first end and a second end, the first end of the safety barrier is connected to the controller, and the second end of the safety barrier is used to connect to an intrinsically safe explosion-proof device through the second interface.

[0014] According to another specific embodiment of the present invention, an explosion-proof air volume control system is disclosed, wherein the number of intrinsically safe explosion-proof devices includes multiple devices, and the multiple intrinsically safe explosion-proof devices include an explosion-proof touch screen and an explosion-proof displacement sensor.

[0015] The plurality of safety barriers include displacement safety barriers and screen safety barriers. The displacement safety barriers are connected to the explosion-proof displacement sensor through a corresponding second interface, and the screen safety barriers are connected to the explosion-proof touch screen through a corresponding second interface.

[0016] According to another specific embodiment of the present invention, an explosion-proof air volume control system is disclosed, wherein the number of the first interface includes multiple components, and the number of the explosion-proof connectors includes multiple components.

[0017] The explosion-proof air volume control system further includes a second cable, which is threaded through the corresponding explosion-proof connector and electrically connected to the controller through the corresponding first interface. The second cable is used to supply power to the controller.

[0018] According to another specific embodiment of the present invention, an explosion-proof air volume control system is disclosed. The explosion-proof air volume control system further includes a third cable, which is threaded through the corresponding explosion-proof connector and electrically connected to the controller through the corresponding first interface. The controller is used to electrically connect to a lighting device through the third cable.

[0019] According to another specific embodiment of the present invention, an explosion-proof air volume control system is disclosed. The number of explosion-proof air volume regulating valves includes multiple valves. The first cable of the explosion-proof actuator of each explosion-proof air volume regulating valve is passed through the corresponding explosion-proof connector and electrically connected to the controller through the corresponding first interface.

[0020] According to another specific embodiment of the present invention, an explosion-proof air volume control system is disclosed, wherein the explosion-proof box includes: a box body, and the first interface and the second interface are both disposed in the box body;

[0021] The top cover is sealed to the box body and together with the box body defines the explosion-proof cavity.

[0022] According to another specific embodiment of the present invention, an explosion-proof air volume control system is disclosed, wherein the explosion-proof connector is an explosion-proof flexible connector.

[0023] According to another specific embodiment of the present invention, an explosion-proof air volume control system is disclosed. The explosion-proof air volume regulating valve includes: a valve body, the valve body including a cylinder and blades disposed within the cylinder, the cylinder having an inner cavity extending along a first direction, and openings communicating with the inner cavity at both ends of the cylinder along the first direction; the blades being rotatable within the cylinder to adjust the opening degree of the valve body; and an explosion-proof actuator disposed outside the valve body, including an explosion-proof housing and a drive unit, the drive unit being disposed within the explosion-proof cavity, and the drive unit being connected to the blades for driving the blades to rotate.

[0024] An embodiment of this utility model also discloses an explosion-proof exhaust cabinet, comprising: the explosion-proof air volume control system described in any of the above embodiments; a cabinet having a working chamber, wherein the explosion-proof air volume regulating valve is connected to the working chamber.

[0025] By adopting the above technical solution, the embodiment of this application installs the explosion-proof air volume control system on the explosion-proof exhaust cabinet, so that the explosion-proof exhaust cabinet can dynamically adjust the exhaust volume of the explosion-proof air volume regulating valve through the controller in the explosion-proof air volume control system to obtain a stable face velocity, completely blocking the escape path of harmful media in the cabinet, and ensuring the safety of operators from the source.

[0026] According to another specific embodiment of the present invention, an explosion-proof exhaust cabinet is disclosed. The cabinet further includes a fluid channel with a vent, and the fluid channel is connected to the working chamber. The explosion-proof air volume regulating valve is disposed at the vent and is connected to the fluid channel. The explosion-proof box is disposed at the top of the cabinet.

[0027] According to another specific embodiment of the present invention, an explosion-proof exhaust fan cabinet is disclosed, wherein the number of fluid channels includes a plurality of fluid channels, and the plurality of fluid channels include a makeup air channel and an exhaust air channel, and the explosion-proof box is disposed on the top of the makeup air channel;

[0028] The number of explosion-proof air volume regulating valves includes multiple ones, and each of the multiple explosion-proof air volume regulating valves includes an explosion-proof air supply valve and an explosion-proof air exhaust valve. The explosion-proof air supply valve is correspondingly set at the ventilation opening of the air supply channel, and the explosion-proof air exhaust valve is correspondingly set at the ventilation opening of the exhaust channel.

[0029] According to another specific embodiment of the present invention, an explosion-proof exhaust cabinet is disclosed. The explosion-proof exhaust cabinet further includes: a window assembly disposed on the front wall of the cabinet body, the window assembly being able to open in a first direction to form a front opening open to the indoor environment, and an explosion-proof displacement sensor of the explosion-proof air volume control system being disposed on the cabinet body and connected to the window assembly.

[0030] According to another specific embodiment of the present invention, an explosion-proof ventilation cabinet is disclosed, the explosion-proof ventilation cabinet further includes: a lighting device disposed in the working chamber, and the controller is electrically connected to the lighting device through a third cable.

[0031] To make the above-mentioned contents of this utility model more obvious and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0032] Figure 1A A perspective view of an embodiment of the explosion-proof air volume control system and explosion-proof exhaust cabinet of the present invention is shown.

[0033] Figure 1B This diagram shows a perspective view of an embodiment of the explosion-proof air volume control system and explosion-proof exhaust cabinet of the present invention. Figure 2 ;

[0034] Figure 1C Show Figure 1B A magnified view of a portion of region A in the middle;

[0035] Figure 1D A three-dimensional schematic diagram of an embodiment of the explosion-proof air volume control system and explosion-proof exhaust cabinet of the present invention is shown in Figure 3.

[0036] Figure 1E Show Figure 1D A magnified view of a portion of region B in the middle;

[0037] Figure 2 A perspective view of an embodiment of the explosion-proof air volume control system of the present invention is shown;

[0038] Figure 3A A perspective view of an explosion-proof airflow control system according to an embodiment of the present invention is shown, wherein the top cover of the explosion-proof box is not shown.

[0039] Figure 3B A cross-sectional schematic diagram of an explosion-proof airflow control system according to an embodiment of the present invention is shown, wherein the controller is not shown;

[0040] Figure 4 This diagram illustrates the structure of a controller, safety barrier, and explosion-proof displacement sensor according to an embodiment of the present invention.

[0041] Figure 5 A perspective view of another embodiment of the explosion-proof air volume control system of the present invention is shown;

[0042] Figure 6 A perspective view of another embodiment of the explosion-proof air volume control system and explosion-proof exhaust cabinet of this utility model is shown.

[0043] Figure 7 A perspective view showing another embodiment of the explosion-proof air volume control system and explosion-proof exhaust cabinet of this utility model. Figure 2 . Detailed Implementation

[0044] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0045] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0047] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0048] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0049] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0050] refer to Figure 1AThis application provides an explosion-proof ventilation cabinet 100, including: an explosion-proof air volume control system 110, a cabinet 120, a window assembly 130, and a lighting device 140.

[0051] Among them, such as Figure 1A As shown, the explosion-proof fume hood 100 has a cabinet 120 with a working chamber 121, and a front opening 121a is formed on the front side of the working chamber 121 to open to the indoor environment. Exemplarily, the front opening 121a serves as an operating port. A viewing window assembly 130 is disposed on the front wall 122 of the cabinet 120, and the viewing window assembly 130 can be positioned along a first direction (e.g., the height direction of the cabinet 120, such as...). Figure 1A (As shown in the Z direction) Move upwards or downwards.

[0052] Continue to refer to Figure 1A The explosion-proof fume hood 100 also includes a support column 150. The support column 150 is along a second direction (e.g., the width direction of the cabinet body 120, such as...). Figure 1A (As shown in the X direction) The columns 150 are located on both sides of the working cavity 121. The columns extend along the first direction Z and are positioned along the second direction X towards the window assembly 130. Exemplarily, the column 150 includes a slide rail (not shown) extending along the first direction Z. The slide rail of the column 150 accommodates a slider (not shown) of the window assembly 130. The window assembly 130 is slidably connected to the column 150 via the slider, allowing the window assembly 130 to move relative to the column 150 along the first direction Z. Furthermore, the slider is located within the slide rail of the column 150, so that the column 150 limits the window assembly 130, preventing it from detaching from the column 150 and ensuring that the window assembly 130 can slide relative to the column 150 along the first direction Z.

[0053] For example, such as Figure 1A As shown, the window assembly 130 of this embodiment includes a glass window 131 and a window frame 132. The glass window 131 is installed within the window frame 132, which is positioned along the second direction X towards the column 150. The window frame 132 is equipped with a slider, which slidably connects the window frame 132 to the column 150, allowing the window frame 132 to slide relative to the column 150 along the first direction Z. Furthermore, the window frame 132 is made of aluminum alloy or antistatic modified polypropylene (PP), and its surface resistivity is 1*10⁻⁶. 6 Ω to 1*10 9 Ω, thereby controlling the static electricity generated by friction when the window assembly 130 moves relative to the column 150, reducing the risk of explosion caused by frictional charging.

[0054] refer to Figure 1B The explosion-proof exhaust cabinet 100 in this embodiment of the application also includes a transmission assembly 160.

[0055] like Figure 1B Combination Figure 1C and Figure 1A As shown, the transmission assembly 160 includes an anti-static transmission unit 161, an anti-static synchronization unit 162, and an anti-static counterweight unit 163. The anti-static synchronization unit 162 is sleeved on the anti-static transmission unit 161 and connected to both the viewing window assembly 130 and the anti-static counterweight unit 163. The anti-static synchronization unit 162 and the anti-static counterweight unit 163 are electrically connected, and the anti-static transmission unit 161 is electrically connected to the column 150, thus forming a grounding loop between the transmission assembly 160 and the column 150, preventing the local accumulation of static electricity generated by friction in the explosion-proof fume hood 100 of this embodiment.

[0056] Specifically, the antistatic synchronization unit 162 includes a first end 1621, a second end 1622, and a middle part 1625. The first end 1621 of the antistatic synchronization unit 162 is connected to the window assembly 130 (e.g., the window frame 132). The antistatic counterweight unit 163 is disposed on the back of the cabinet 120. The antistatic counterweight unit 163 is connected to the second end 1622 of the antistatic synchronization unit 162. The middle part 1625 of the antistatic synchronization unit 162 is located between the first end 1621 and the second end 1622.

[0057] Along the first direction Z, when the window assembly 130 moves upward, it drives the first end 1621 of the antistatic synchronization unit 162 to move upward, and the outer peripheral surface of the antistatic transmission unit 161 contacts and engages with the middle part 1625 of the antistatic synchronization unit 162 to drive the second end 1622 of the antistatic synchronization unit 162 and the antistatic counterweight unit 163 to move downward; when the window assembly 130 moves downward, it drives the first end 1621 of the antistatic synchronization unit 162 to move downward, and the second end 1622 of the antistatic synchronization unit 162 and the antistatic counterweight unit 163 to move upward through the antistatic transmission unit 161.

[0058] Exemplarily, the transmission assembly 160 in this embodiment further includes lubricating grease, which is coated on the middle portion 1625 of the antistatic synchronization unit 162, i.e., the lubricating grease is disposed between the middle portion 1625 of the antistatic synchronization unit 162 and the antistatic transmission unit 161. The antistatic transmission unit 161 has an axially extending bearing (not shown in the figure), which is also coated with lubricating grease. The lubricating grease in this embodiment is made of perfluoropolyether grease, which has excellent chemical inertness, high temperature resistance, and non-flammability, and will not react with flammable and explosive gases, eliminating the risk of ordinary lubricating grease decomposing and generating an ignition source under high temperature or friction. However, this is not a limitation; the material of the lubricating grease in this embodiment is not specifically limited and can be set according to actual conditions.

[0059] For example, such as Figure 1C As shown, the antistatic counterweight unit 163 includes a body portion 1631 and a connecting portion 1632. The connecting portion 1632 is disposed at one end of the body portion 1631 facing the second end 1622 of the antistatic synchronization unit 162. The connecting portion 1632 has a through hole 1633, so that the second end 1622 of the antistatic synchronization unit 162 bypasses the antistatic transmission unit 161 and passes through the through hole 1633 to connect with the body portion 1631 of the antistatic counterweight unit 163, so that the antistatic synchronization unit 162 and the body portion 1631 of the antistatic counterweight unit 163 are electrically connected.

[0060] For example, the antistatic synchronization unit 162 also includes a fastener 1623. The fastener 1623 passes through the second end 1622 of the antistatic synchronization unit 162 and connects to the body portion 1631 of the antistatic counterweight unit 163, so that the second end 1622 of the antistatic synchronization unit 162 is fixedly connected to the body portion 1631 of the antistatic counterweight unit 163, thereby ensuring the stability of the conductive connection between the antistatic synchronization unit 162 and the body portion 1631 of the antistatic counterweight unit 163.

[0061] For example, the antistatic synchronization unit 162 further includes a ring buckle 1624, which is sleeved between the portion of the antistatic synchronization unit 162 that passes through the through hole 1633 and the portion of the antistatic synchronization unit 162 that does not pass through the through hole 1633, so that the antistatic synchronization unit 162 forms a hook-like structure, fixing the upper edge of the through hole 1633 of the connecting portion 1632 into the hook, so that the antistatic synchronization unit 162 can drive the body portion 1631 of the antistatic counterweight unit 163 to move along the first direction Z.

[0062] And, as Figure 1A and Figure 1C As shown, the number of transmission components 160 in this embodiment includes two, and the two transmission components 160 are spaced apart on both sides of the working cavity 121 along the second direction X. Each transmission component 160 has an anti-static transmission unit 161 that includes components along the front-rear direction of the cabinet 120 (e.g., ...). Figure 1C Two synchronous pulleys are spaced apart (as shown in the Y direction). The anti-static synchronization unit 162 is a synchronous belt, the body 1631 of the anti-static counterweight unit 163 is a sheet metal part, and the fastener 1623 is a fastening screw. However, this application embodiment does not limit the number of transmission components 160 and anti-static transmission units 161, or the structure of anti-static transmission units 161, anti-static synchronization units 162, and anti-static counterweight units 163. They can be specifically set according to the actual situation. For example, the anti-static synchronization unit 162 can also be a steel wire rope.

[0063] For example, continue to refer to Figure 1CThe transmission assembly 160 in this embodiment further includes a conductive bracket 164 corresponding to the antistatic transmission unit 161. The conductive bracket 164 is disposed on the inner side of the column 150, and the antistatic transmission unit 161 (e.g., a synchronous pulley) is rotatably connected to the conductive bracket 164 along the second direction X, so that the antistatic transmission unit 161 is electrically connected to the column 150 through the conductive bracket 164.

[0064] For example, the conductive support 164 is made of aluminum alloy, the column 150 is an aluminum profile, and the outer side of the aluminum profile is coated with an antistatic coating. Furthermore, the antistatic transmission unit 161 is made of aluminum alloy, the antistatic synchronization unit 162 is made of antistatic modified polyurethane, and the surface resistance of both the antistatic transmission unit 161 and the antistatic synchronization unit 162 is 1*10⁻⁶. 6 Ω to 1*10 9 Ω, thereby controlling the motion friction between the antistatic transmission unit 161 and the antistatic synchronization unit 162 of the transmission component 160 and the static electricity generated by the movement of the antistatic counterweight unit 163 relative to the cabinet 120 when the window component 130 moves relative to the column 150, so that the transmission component 160 and the column 150 form a grounding circuit, avoiding the local accumulation of static electricity generated by friction in the explosion-proof exhaust cabinet 100 of this application embodiment, and reducing the risk of explosion caused by friction electrification.

[0065] However, this application embodiment does not impose specific limitations on the materials of the antistatic transmission unit 161, antistatic synchronization unit 162, and antistatic counterweight unit 163 in the column 150, conductive bracket 164, and transmission assembly 160, and can be specifically set according to actual conditions. In other possible embodiments, for example, the material of the antistatic transmission unit 161 in this application embodiment can also be a low-polarity antistatic modified material such as antistatic modified polypropylene, and the material of the antistatic coating can be antistatic epoxy resin, etc.

[0066] refer to Figure 1D The explosion-proof exhaust cabinet 100 in this embodiment of the application also includes a grounding connector 170.

[0067] like Figure 1DAs shown, the grounding connector 170 includes multiple grounding cables 171 and a grounding terminal (not shown in the figure). The grounding terminal is used for grounding. One end of one of the grounding cables 171 is connected to the inside of the column 150, and the other end is used to connect to an external electrical system (such as the explosion-proof air volume control system described later). This allows the external electrical system, column 150, window assembly, and transmission assembly 160 to form a grounding loop through the grounding connector 170. This combines the anti-static design of the main body of the explosion-proof exhaust hood 100 (such as the column 150, window assembly, and transmission assembly 160) with the explosion-proof design of the external electrical system, achieving an overall explosion-proof design for the explosion-proof exhaust hood 100. This significantly reduces the explosion-proof risk of the explosion-proof exhaust hood 100 and meets the requirements of explosion-proof standards.

[0068] For example, such as Figure 1C and Figure 1D As shown, the explosion-proof fume hood 100 of this application embodiment also includes a decorative panel 180. Specifically, the decorative panel 180 is disposed on the front wall of the cabinet 120. The decorative panel 180 is electrically connected to the column 150 through the grounding cable 171 of the grounding connector 170, so that the decorative panel 180 is electrically connected to the main body of the explosion-proof fume hood 100 through the grounding cable 171, so that the decorative panel 180 is connected to the grounding circuit of the explosion-proof fume hood 100, further reducing the risk of explosion caused by frictional electrification.

[0069] For example, the decorative panel 180 is a sheet metal part, and the outer side of the sheet metal part is provided with an anti-static coating. The material of the anti-static coating is anti-static epoxy resin, but it is not limited to this and can be specifically set according to the actual situation.

[0070] refer to Figure 1E and combined Figure 1D The explosion-proof exhaust cabinet 100 in this embodiment of the application also includes a buffer unit 190.

[0071] like Figure 1E As shown, the buffer unit 190 is disposed on the cabinet 120, wherein along the first direction Z, the buffer unit 190 is located between the anti-static counterweight unit 163 and the cabinet 120. Exemplarily, the buffer unit 190 of this application embodiment includes a first buffer pad 191 and a second buffer pad 192.

[0072] Specifically, along the first direction Z, the first buffer pad 191 and the second buffer pad 192 are located on opposite sides of the antistatic counterweight unit 163. For example... Figure 1E As shown, the first buffer pad 191 is located above the antistatic counterweight unit 163, and the first buffer pad 191 is disposed opposite to the body part 1631 of the antistatic counterweight unit 163. The second buffer pad 192 is located below the antistatic counterweight unit 163, and the second buffer pad 192 is disposed opposite to the body part 1631 of the antistatic counterweight unit 163.

[0073] For example, continue to refer to Figure 1E and combined Figure 1D The cabinet 120 in this embodiment further includes guide brackets 125. The guide brackets 125 are disposed on both sides of the working cavity 121 along the second direction X, and each guide bracket 125 extends along the first direction Z and is disposed towards the anti-static counterweight unit 163 along the third direction Y, so that the anti-static counterweight unit 163 can move relative to the guide bracket 125 along the first direction Z. The guide brackets 125 can guide the anti-static counterweight unit 163 to move up and down, so that the upward or downward movement of the viewing window assembly 130 is smoother and more stable. Figure 1E As shown, the first buffer pad 191 and the second buffer pad 192 are spaced apart along the first direction Z at both ends of the guide bracket 125 and face the antistatic counterweight unit 163.

[0074] Therefore, when the viewing window assembly is pushed to a preset position (e.g., the highest or lowest position), the antistatic counterweight unit 163 will first impact the first buffer pad 191 or the second buffer pad 192, rather than directly impacting the cabinet 120 (e.g., the metal frame). Furthermore, by providing a buffer unit 190 between the antistatic counterweight unit 163 and the cabinet 120, the explosion-proof fume hood 100 of this embodiment can effectively absorb the impact energy when the viewing window assembly 130 moves to a preset position (e.g., the highest or lowest position), eliminating hard impacts between the components and systematically eliminating ignition sources from a mechanical structure perspective, significantly improving the overall safety performance of the explosion-proof fume hood 100 in explosive hazardous environments.

[0075] For example, the guide bracket 125 has an L-shaped cross-section, such as... Figure 1D and Figure 1E As shown, one side wall of the guide bracket 125 is fixedly connected to the cabinet 120, and the first buffer pad 191 and the second buffer pad 192 are spaced apart on one side wall of the guide bracket 125. The other side wall of the guide bracket 125 is arranged along the third direction Y towards the working cavity 121. However, it is not limited to this. The structure of the guide bracket 125 is not specifically limited in this embodiment, as long as the anti-static counterweight unit 163 can move along the extension direction of the guide bracket 125.

[0076] For example, the materials of the first buffer pad 191 and the second buffer pad 192 are silicone or fluororubber. Both of these materials have good elasticity, aging resistance and do not generate sparks upon impact. However, they are not limited to these materials. The materials of the first buffer pad 191 and the second buffer pad 192 can be selected according to the actual situation.

[0077] For example, such as Figure 1D and Figure 1EAs shown, the antistatic counterweight unit 163 also includes a wear-resistant component 1634, which is disposed on the side wall of the main body 1631 and electrically connected to the antistatic counterweight unit 163. Along the third direction Y, the wear-resistant component 1634 is located between the main body 1631 of the antistatic counterweight unit 163 and the other side wall of the guide bracket 125, i.e., the wear-resistant component 1634 is slidably connected to the guide bracket 125. The wear-resistant component 1634 not only reduces the contact area between the antistatic counterweight unit 163 and the guide bracket 125, increasing lubrication; furthermore, the wear-resistant component 1634 can be made of non-sparking materials such as copper alloy or ceramic to ensure that no frictional sparks are generated during sliding.

[0078] Continue to refer to Figure 1A The explosion-proof fume hood 100 is further equipped with an explosion-proof airflow control system 110 provided in this embodiment of the application on its cabinet 120. The explosion-proof airflow control system 110 is installed on ventilation equipment (such as the aforementioned explosion-proof fume hood 100 or ventilation room) to enable the ventilation equipment to dynamically adjust the exhaust volume of the explosion-proof airflow regulating valve 112 through the controller (not shown in the figure) in the explosion-proof airflow control system 110, thereby obtaining a stable face velocity and completely blocking the escape path of harmful media inside the cabinet, ensuring the safety of operators from the source. However, this is not limited to this; this application does not specifically limit the application scenarios of the explosion-proof airflow control system 110. Any application that can achieve face velocity control of the ventilation equipment through the explosion-proof airflow control system 110 provided in this embodiment of the application falls within the protection scope of this application. For example, the explosion-proof airflow control system 110 can be installed on a ventilation room with only left and right sliding doors.

[0079] Among them, such as Figure 1A As shown, the cabinet 120 also includes a fluid channel 123. The fluid channel 123 has a vent (not shown in the figure) and communicates with the working chamber 121 of the cabinet 120. The explosion-proof airflow regulating valve 112 of the explosion-proof airflow control system 110 is located at the vent and communicates with the fluid channel 123. Exemplarily, the fluid channel 123 is located at the top of the cabinet 120, but it is not limited thereto. The embodiments of this application do not specifically limit the structure and location of the fluid channel 123, and it can be specifically set according to the actual situation.

[0080] Combination Figure 2 As shown, the explosion-proof air volume control system 110 of this application embodiment includes: an explosion-proof box 111, a controller, a safety barrier (not shown in the figure), an explosion-proof air volume regulating valve 112, and an explosion-proof connector 113.

[0081] Specifically, the explosion-proof box 111 and the explosion-proof air volume regulating valve 112 are both located on the top of the cabinet 120. The explosion-proof box 111 is spaced apart from the fluid channel 123. The explosion-proof box 111 and the explosion-proof air volume regulating valve 112 are connected by an explosion-proof connector 113, and the explosion-proof air volume regulating valve 112 is connected to the working chamber 121.

[0082] For example, the explosion-proof airflow regulating valve 112 of this application embodiment has the functions of airflow detection and airflow regulation, and is an explosion-proof and intrinsically safe electrical device. Figure 2 As shown, the explosion-proof airflow regulating valve 112 includes an explosion-proof actuator 1121 and a valve body 1124. Furthermore, in this embodiment, the explosion-proof airflow regulating valve 112 uses an impeller-type flow sensor to detect flow rate, and its explosion-proof type is intrinsically safe. The explosion-proof airflow regulating valve 112 uses an explosion-proof actuator 1121 to regulate airflow, and the explosion-proof actuator is flameproof.

[0083] It is understood that the intrinsically safe type mentioned in the embodiments of this application refers to achieving explosion protection by limiting circuit energy, ensuring that the electric spark energy does not exceed the minimum ignition energy of the corresponding explosive medium under normal and fault conditions; the explosion-proof type mentioned in the embodiments of this application refers to achieving explosion protection through a high-strength shell and an explosion-proof joint surface. The shell can withstand the explosion pressure of the internal explosive mixture without damage; the joint surface is designed with specific gaps and lengths so that when the internal explosion flame and high-temperature gas pass through the gaps, they are cooled to below the ignition temperature by the shell, blocking the propagation to the external explosive environment. At the same time, the shell protection level is ≥IP54, which can prevent dust and water, and prevent the electrical components inside the shell (e.g., explosion-proof box 111) from being affected by external dust and liquids and causing malfunctions.

[0084] like Figure 2 As shown, the valve body 1124 includes a blade 1125 disposed within the valve body 1124, and the valve body 1124 has a first direction (i.e., Figure 2 The valve body 1124 has an inner cavity 1126 extending in the Z direction (as shown). Both ends of the valve body 1124 have openings communicating with the inner cavity 1126. The blade 1125 can rotate within the valve body 1124 to adjust the opening degree of the valve body 1124. An explosion-proof actuator 1121 is located outside the valve body 1124 and includes an explosion-proof housing 11211 and a drive unit (not shown in the figure). The drive unit is located inside the explosion-proof housing 11211 and connected to the blade 1125 for driving the blade 1125 to rotate.

[0085] refer to Figure 2 and Figure 3AThe explosion-proof box 111 of this application embodiment has a first interface 1111 and a second interface 1112, and the explosion-proof box 111 defines an explosion-proof cavity 1113. The controller 114 and the safety barrier 115 are both disposed in the explosion-proof cavity 1113. The controller 114 corresponds to the first interface 1111, and the safety barrier 115 is connected to the controller 114 and corresponds to the second interface 1112, so that the controller 114 corresponds to the second interface 1112 through the safety barrier 115.

[0086] For example, such as Figure 3A and Figure 3B As shown, the explosion-proof box 111 of this embodiment includes a box body 111a and a top cover 111b. A first interface 1111 and a second interface 1112 are spaced apart on the side wall of the box body 111a. The top cover 111b is sealed to the box body 111a and, together with the box body 111a, defines an explosion-proof cavity 1113. The explosion-proof box 111 is rectangular in shape, but this embodiment does not limit the specific structure of the explosion-proof box 111; for example, it can also be a cube or a sphere.

[0087] For example, the explosion-proof connector 113 in this application embodiment is an explosion-proof flexible connector. However, it is not limited thereto, and the structure of the explosion-proof connector 113 is not specifically limited in this application embodiment. It can be understood that the first interface 1111 and the second interface 1112 in this application embodiment have the same structure. For ease of understanding, the first interface 1111 and the first cable 11212 will be used as examples for detailed description below.

[0088] like Figure 3B As shown, the first interface 1111 is opened in the box body 111a of the explosion-proof box 111. The inner wall of the first interface 1111 is provided with an internal thread. An explosion-proof gland is provided at the first interface 1111. The explosion-proof gland includes a connecting body 11111, a clamping nut 11112, a clamping ring 11113 and a sealing joint 11114. The outer surface of the connecting body 11111 is provided with external threads, and the inner wall of the sealing joint 11114 is provided with internal threads. The connecting body 11111 is threadedly connected to the inner wall of the first interface 1111 and the inner wall of the sealing joint 11114 respectively. The explosion-proof connector 113, which is sleeved on the first cable 11212, is threadedly connected to the inner wall of the sealing joint 11114, so that the end of the first cable 11212 passes through the clamping nut 11112, the clamping ring 11113 and the first interface 1111 and enters the explosion-proof cavity 1113. Tightening the sealing joint 11114 can drive the clamping ring 11113 to drive the clamping nut 11112 to press the connecting body 11111 and the first cable 11212 towards the first interface 1111, so as to achieve the function of fastening and sealing.

[0089] In other words, this application uses explosion-proof glands to secure and seal cables (such as the first cable, second cable, third cable, or cables connected to intrinsically safe explosion-proof devices). Furthermore, combined with... Figure 2 , Figure 3A and Figure 3B As shown, when the controller 114 is connected to the explosion-proof equipment through the corresponding first interface 1111, the explosion-proof connector 113, which is sleeved outside the cable, provides a flexible transition and absorbs vibration, thus maintaining the overall explosion-proof and IP protection integrity of the explosion-proof system. Those skilled in the art will understand that when an explosion occurs inside one of the explosion-proof devices (e.g., the explosion-proof actuator 1121 of the explosion-proof box 111 and the explosion-proof airflow regulating valve 112) at both ends of the explosion-proof connector 113, and flames (or pressure) enter the explosion-proof connector 113, it can withstand the pressure and cool the flames, preventing the explosion from propagating to the other explosion-proof device (e.g., the explosion-proof box 111), ensuring the integrity of the entire explosion-proof circuit.

[0090] Therefore, the controller 114 can be connected to the explosion-proof actuator 1121 of the explosion-proof airflow regulating valve 112 via the first interface 1111 and the explosion-proof connector 113, so as to realize the controller 114's control over the exhaust volume of the explosion-proof airflow regulating valve 112, dynamically adjusting the exhaust volume of the explosion-proof airflow regulating valve 112, so that the explosion-proof exhaust fan 100 can obtain a stable face velocity. It can be understood that the controller 114 is a high-voltage electrical device with multiple ports (see...). Figure 4 (It has a built-in relay, which poses a risk of generating electrical sparks.)

[0091] Based on this, the embodiments of this application enclose all components that may ignite an explosive gas mixture (such as controller 114) within a housing (i.e., explosion-proof box 111). Explosion-proof box 111 can withstand the explosion of flammable mixtures that penetrate into the interior of explosion-proof box 111 through any joint surface or structural gap without damage, and will not ignite an explosive atmosphere formed externally. Components that may generate sparks, arcs, and dangerous temperatures (such as controller 114) are all placed inside explosion-proof box 111, i.e., explosion-proof cavity 1113. Explosion-proof box 111 isolates the internal space of the equipment (i.e., explosion-proof cavity 1113) from the surrounding environment. Explosion-proof cavity 1113 is sealed to the outside, preventing the leakage of explosive media such as sparks and arcs within the explosion-proof cavity, and isolating explosive media such as sparks and arcs from contact with the outside air, thereby reducing the risk of explosion.

[0092] Furthermore, the explosion-proof box 111 and the explosion-proof actuator 1121 are connected together by an explosion-proof connector 113. The explosion-proof actuator 1121 has a first cable (not shown in the figure), which passes through the first interface 1111 and connects to the controller 114 and the explosion-proof actuator 1121 respectively, so that the explosion-proof actuator 1121 and the controller 114 are electrically connected, so that the controller 114 can adjust the air volume of the explosion-proof air volume regulating valve 112 through the explosion-proof actuator 1121, thereby realizing the function of dynamically adjusting the exhaust volume of the explosion-proof air volume control system 110.

[0093] Furthermore, the controller 114 in this embodiment can also be connected to the intrinsically safe explosion-proof device via the safety barrier 115 and the second interface 1112. It is understood that the safety barrier 115 in this embodiment is placed within a safe area (e.g., the explosion-proof cavity 1113 of the explosion-proof box 111 in this application) and is designed using intrinsically safe technology. It can limit the energy of the electrical signal transmitted from the controller 114 to the intrinsically safe explosion-proof device, so that the electrical signal, after energy constraint through the safety barrier 115, is provided to the intrinsically safe explosion-proof device via a cable through the second interface 1112.

[0094] Furthermore, this embodiment of the application, through the energy limiting and voltage stabilization function of the safety barrier 115, stabilizes the electrical signal provided by the controller 114 at a safe voltage and current, and divides the operating environment of the explosion-proof airflow control system 110 into a safe area (e.g., the explosion-proof cavity 1113) and an unsafe area (e.g., the outside of the explosion-proof box 111) through the explosion-proof connector 113. On the one hand, high-voltage equipment (potentially generating electrical sparks) is connected to the controller 114 inside the explosion-proof box 111 through the explosion-proof connector 113; on the other hand, the energy-constrained electrical signal is provided to an intrinsically safe explosion-proof device capable of operating at a safe voltage and current through the safety barrier 115. This achieves overall explosion-proof protection for the explosion-proof airflow control system 110, making it an explosion-proof and intrinsically safe electrical device that not only balances explosion-proof safety and energy consumption reduction but also improves exhaust stability.

[0095] Continue to refer to Figure 3A and combined Figure 2 For example, the number of safety barriers 115 in this application embodiment includes two, namely a displacement safety barrier 1151 and a screen safety barrier 1152, which are spaced apart in the explosion-proof cavity 1113. The number of intrinsically safe explosion-proof devices 116 in this application embodiment includes two, namely an explosion-proof displacement sensor 1161 and an explosion-proof touch screen 1162, wherein the explosion-proof displacement sensor 1161 is connected to the controller 114 through a corresponding second interface 1112 and the displacement safety barrier 1151, and the explosion-proof touch screen 1162 is connected to the controller 114 through a corresponding second interface 1112 and the screen safety barrier 1152.

[0096] It is understood that the embodiments of this application do not specifically limit the number of safety barriers 115 and second interfaces 1112. The number of safety barriers and second interfaces can correspond to the number of intrinsically safe explosion-proof devices. For example, in other possible implementations, the number of intrinsically safe explosion-proof devices in the embodiments of this application can be one, three, four or more, and the corresponding number of safety barriers and second interfaces can also be one, three, four or more.

[0097] Furthermore, in some possible implementations, the embodiments of this application may not include an intrinsically safe explosion-proof device. That is, the controller 114 of the embodiments of this application is connected to the explosion-proof air volume regulating valve or other explosion-proof devices only through the first interface 1111 and the explosion-proof connector 113.

[0098] The displacement safety barrier 1151 and the screen safety barrier 1152 have the same structure. However, due to the different electrical specifications of the explosion-proof displacement sensor 1161 and the explosion-proof touchscreen 1162, the differences between the displacement safety barrier 1151 and the screen safety barrier 1152 lie in their electrical parameters such as maximum output voltage, current, power, capacitance, and inductance. For ease of understanding, please refer to the following... Figure 4 The displacement safety barrier 1151 and the explosion-proof displacement sensor 1161 are used as examples for detailed explanation.

[0099] like Figure 4 As shown, the area within the dashed box (such as...) Figure 4 As shown in area C, the area within the explosion-proof cavity 1113 represents the safe zone, while the area outside the dashed box C represents the unsafe zone. The controller 114 has ports 1141. Exemplarily, the number of ports 1141 may include multiple ports, which can be set according to actual conditions; this application does not impose a specific limitation on this. The displacement safety barrier 1151 has a first end 115a and a second end 115b. The first end 115a of the displacement safety barrier 1151 is connected to port 1141 of the controller 114, and the second end 115b of the displacement safety barrier 1151 is electrically connected to the explosion-proof displacement sensor 1161 via a cable passing through a second interface (not shown in the figure).

[0100] For example, such as Figures 1A to 1C As shown, in this embodiment of the application, the explosion-proof displacement sensor 1161 is disposed on the top of the cabinet 120. The explosion-proof displacement sensor 1161 is connected to the anti-static synchronization unit 162 of the transmission assembly 160 to detect the distance the window moves along the first direction Z.

[0101] For example, such as Figure 1A As shown, the explosion-proof touch screen 1162 of this application embodiment is installed on the column 150 of the cabinet 120 so that the user can read the variable air volume information (such as face wind speed) output by the explosion-proof touch screen 1162 or input control commands to adjust the exhaust volume.

[0102] Continue to refer to Figure 2 In this embodiment of the application, the number of first interfaces 1111 includes three, the number of explosion-proof connectors 113 includes three, the three first interfaces 1111 are spaced apart on the side wall of the box 111a, and the three explosion-proof connectors 113 are respectively connected to the three first interfaces 1111 one by one.

[0103] The explosion-proof airflow control system 110 of this application embodiment further includes a second cable (not shown in the figure) and a third cable (not shown in the figure). Wherein, as Figure 2 As shown, the second cable passes through the corresponding explosion-proof connector 113 and connects to the controller 114 (see Figure 1111) via the corresponding first interface 1111. Figure 3A An electrical connection is made so that an external power source can be electrically connected to the controller via a second cable, which is used to supply power to the controller 114.

[0104] like Figure 1A and Figure 2 As shown, the lighting device 140 is installed inside the working chamber 121, and one end 141 of the lighting device 140 extends out of the top of the cabinet 120, that is, one end 141 of the lighting device 140 extends out of the inner lining plate 124. The third cable is passed through the corresponding explosion-proof connector 113 and is connected to the controller 114 (see...) through the corresponding first interface 1111. Figure 3A ( ) and electrically connected to the lighting device 140 via one end 141 of the lighting device 140.

[0105] For example, such as Figure 1A As shown, the explosion-proof fume hood 100 of this application embodiment also includes an explosion-proof lighting switch 143 and four explosion-proof sockets 144. Along the second direction X, the four explosion-proof sockets 144 and the explosion-proof lighting switch 143 are spaced apart on the front wall of the cabinet 120. The explosion-proof lighting switch 143 is electrically connected to the other end of the lighting device 140 to control the lighting device 140 to turn on or off. This application embodiment does not specifically limit the number of explosion-proof sockets 144; in other possible implementations, the number of explosion-proof sockets 144 can be one, two, three, or more. Furthermore, at least one explosion-proof socket 144 and explosion-proof lighting switch 143 in this application embodiment must be selected according to the corresponding explosion-proof type according to explosion-proof standards (such as GB 3836 series), for example, flameproof type. It is prohibited to reserve non-explosion-proof electrical interfaces, thus systematically eliminating ignition sources from an electrical perspective.

[0106] In the above embodiments, the number of explosion-proof air volume regulating valves 112 in the explosion-proof air volume control system 110 is one. However, this is not a limitation. The embodiments of this application do not specifically limit the number of explosion-proof air volume regulating valves 112 in the explosion-proof air volume control system 110. In other possible embodiments, the number of explosion-proof air volume regulating valves 112 can also be multiple. For example, the number of explosion-proof air volume regulating valves 112 can also be two, three, four or more.

[0107] refer to Figure 5 and Figure 6 In this embodiment, the difference from the above embodiment is that the explosion-proof air volume control system 110 has two explosion-proof air volume regulating valves 112, namely an explosion-proof air supply valve 1122 and an explosion-proof exhaust valve 1123, and the cabinet 120 of the explosion-proof exhaust cabinet 100 has two fluid channels 123, namely an air supply channel 1231 and an exhaust channel 1232 (see...). Figure 7 ).

[0108] like Figure 5 and Figure 6 As shown, the explosion-proof air supply valve 1122 is correspondingly installed at the ventilation opening of the air supply channel 1231, and the explosion-proof exhaust valve 1123 is correspondingly installed at the ventilation opening of the exhaust channel 1232. A part of the air supply channel 1231 is located at the top of the cabinet 120, and the explosion-proof box 111 is installed at the top of the air supply channel 1231. The explosion-proof actuators 1121 of the explosion-proof air supply valve 1122 and the explosion-proof exhaust valve 1123 are respectively connected to the explosion-proof box 111 through two explosion-proof connectors 113. Two first cables are passed through the corresponding explosion-proof connectors 113 and are electrically connected to the controller 114 in the explosion-proof box 111 through the corresponding first interface 1111.

[0109] refer to Figure 7 In this embodiment of the explosion-proof ventilation cabinet 100, the explosion-proof air valve (e.g., the explosion-proof air volume regulating valve 112, i.e., the explosion-proof make-up air valve 1122 and / or the explosion-proof exhaust valve 1123) is provided with a valve grounding terminal 1120, and the explosion-proof box 111 is provided with a grounding terminal 1110. The multiple grounding cables 171 of the grounding connector 170 are respectively connected between the column 150, the grounding terminal 1110, the air valve grounding terminal 1120, the cabinet 120 and the grounding terminal 172, so that the explosion-proof air volume control system 110 of this embodiment of the application and the main body of the explosion-proof ventilation cabinet 100 form a complete grounding circuit. This allows the explosion-proof ventilation cabinet 100 of this embodiment of the application to not only control the static electricity generated by the relative movement and friction of the main body components during use, reducing the risk of explosion caused by frictional charging, but also to provide a reliable grounding structure, ensuring that the user can easily ground the equipment on site. For example, the grounding resistance of the grounding terminal 172 of the grounding connector 170 is ≤4Ω.

[0110] For example, such as Figure 7 and combined Figure 5 As shown, the explosion-proof exhaust cabinet 100 of this embodiment further includes a metal frame (not shown) and an inner lining plate 124 in its cabinet body 120. Specifically, the inner lining plate 124 is installed on the metal frame to define the working chamber. The explosion-proof air valve and the explosion-proof box 111 in the explosion-proof air volume control system 110 are both disposed on the upper surface of the inner lining plate 124, and the lighting device 140 is disposed in the working chamber. One end 141 of the lighting device 140 extends out of the inner lining plate 124 and is provided with a lighting grounding terminal 142. The lighting grounding terminal 142 is electrically connected to the air valve grounding terminal 1120 and the cabinet body 120 respectively through a grounding cable 171. That is, the lighting grounding terminal 142 is connected to the grounding circuit of the explosion-proof exhaust cabinet 100 through the grounding cable 171.

[0111] For example, in this embodiment of the application, the inner lining plate 124 is made of antistatic modified polypropylene material, and the surface resistivity of the inner lining plate is 1*10. 6 Ω to 1*10 9 Ω. The metal frame of the cabinet 120 is made of austenitic stainless steel, such as 304 austenitic stainless steel or 316L austenitic stainless steel, which are non-magnetic and have low triboelectricity. It should be noted that the metal frame of the cabinet 120 in this embodiment of the application shall not be made of carbon steel, martensitic stainless steel, or other strongly magnetic and easily triboelectric materials.

[0112] In summary, this application embodiment installs an explosion-proof airflow control system on an explosion-proof fume hood, enabling the ventilation equipment to dynamically adjust the exhaust volume of the explosion-proof airflow regulating valve through the controller in the explosion-proof airflow control system, thereby obtaining a stable face velocity and completely blocking the escape path of harmful media inside the cabinet, ensuring the safety of operators from the source. On the one hand, high-voltage electrical equipment (which may generate electric sparks, such as the explosion-proof actuator of the explosion-proof airflow regulating valve) is connected to the controller inside the explosion-proof box through explosion-proof connectors. On the other hand, the energy-constrained electrical signal is provided to an intrinsically safe explosion-proof device (such as an explosion-proof displacement sensor or an explosion-proof touch screen) that can operate under safe voltage and current through a safety barrier, realizing the overall explosion-proof of the explosion-proof airflow control system. It is an explosion-proof and intrinsically safe electrical device that not only takes into account explosion-proof safety and reduces energy consumption, but also improves exhaust stability.

[0113] Furthermore, this embodiment of the application designs the main components of the explosion-proof fume hood (e.g., cabinet, column, window assembly, and transmission assembly) with anti-static and spark-free features. This allows for conductive connections between the column, window assembly, and transmission assembly via anti-static transmission units, anti-static synchronization units, and anti-static counterweight units; conductive connections between the anti-static transmission units and the column; and conductive connections between the column and the cabinet via grounding connectors, with grounding achieved through the grounding terminals of the grounding connectors. This forms a complete grounding loop, enabling the explosion-proof fume hood of this embodiment to not only control static electricity generated by relative movement and friction of components during use, reducing the risk of explosion due to frictional charging, but also to provide a reliable grounding structure, ensuring convenient grounding for users on-site.

[0114] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An explosion-proof air volume control system, characterized by, include: An explosion-proof box having a first interface and a second interface, the explosion-proof box defining an explosion-proof cavity; The controller is located in the explosion-proof cavity; A safety barrier is disposed in the explosion-proof cavity. The safety barrier is connected to the controller and is used to connect to an intrinsically safe explosion-proof device through the second interface. An explosion-proof air volume regulating valve includes an explosion-proof actuator, the explosion-proof actuator having a first cable; An explosion-proof connector is provided, in which the first cable passes and is electrically connected to the controller via the first interface.

2. The explosion-proof air volume control system of claim 1, wherein, The number of safety barriers includes multiple ones, and the number of second interfaces also includes multiple ones, with each of the multiple safety barriers corresponding to a multiple of the second interfaces; wherein... Multiple safety barriers are spaced apart in the explosion-proof cavity. Each safety barrier has a first end and a second end. The first end of the safety barrier is connected to the controller, and the second end of the safety barrier is used to connect to an intrinsically safe explosion-proof device through the second interface.

3. The explosion-proof air volume control system of claim 2, wherein, The number of intrinsically safe explosion-proof devices includes multiple devices, and each of the multiple intrinsically safe explosion-proof devices includes an explosion-proof touch screen and an explosion-proof displacement sensor. The plurality of safety barriers include displacement safety barriers and screen safety barriers. The displacement safety barriers are connected to the explosion-proof displacement sensor through a corresponding second interface, and the screen safety barriers are connected to the explosion-proof touch screen through a corresponding second interface.

4. The explosion-proof air volume control system of claim 1, wherein, The number of the first interfaces may include multiples, and the number of the explosion-proof connectors may include multiples; The explosion-proof air volume control system also includes: The second cable is threaded through the corresponding explosion-proof connector and electrically connected to the controller through the corresponding first interface. The second cable is used to supply power to the controller.

5. The explosion-proof air volume control system of claim 4, wherein, The explosion-proof air volume control system also includes: The third cable is threaded through the corresponding explosion-proof connector and electrically connected to the controller through the corresponding first interface. The controller is used to electrically connect to the lighting device through the third cable.

6. The explosion-proof air volume control system of claim 4, wherein, The number of explosion-proof air volume regulating valves includes multiple valves. The first cable of the explosion-proof actuator of each explosion-proof air volume regulating valve is passed through the corresponding explosion-proof connector and electrically connected to the controller through the corresponding first interface.

7. The explosion-proof air volume control system according to claim 1 or 6, characterized by The explosion-proof air volume regulating valve includes: A valve body, comprising a cylinder and blades disposed within the cylinder, the cylinder having an inner cavity extending along a first direction, and openings communicating with the inner cavity at both ends of the cylinder along the first direction, the blades being rotatable within the cylinder to adjust the opening degree of the valve body; The explosion-proof actuator is located on the outside of the valve body and includes an explosion-proof housing and a drive unit. The drive unit is located inside the explosion-proof cavity and is connected to the blade for driving the blade to rotate.

8. An explosion-proof ventilation cabinet, characterized in that, include: The explosion-proof air volume control system according to any one of claims 1-7; The cabinet has a working chamber, and the explosion-proof air volume regulating valve is connected to the working chamber.

9. The explosion-proof exhaust fume cabinet according to claim 8, characterized in that, The cabinet also includes a fluid channel with a vent, and the fluid channel is connected to the working chamber. The explosion-proof air volume regulating valve is located at the vent and is connected to the fluid channel. The explosion-proof box is located at the top of the cabinet.

10. The explosion-proof exhaust fume cabinet according to claim 9, characterized in that, The fluid channels include multiple channels, each including a make-up air channel and an exhaust air channel, with the explosion-proof box disposed on top of the make-up air channel; The number of explosion-proof air volume regulating valves includes multiple ones, and each of the multiple explosion-proof air volume regulating valves includes an explosion-proof air supply valve and an explosion-proof air exhaust valve. The explosion-proof air supply valve is correspondingly set at the ventilation opening of the air supply channel, and the explosion-proof air exhaust valve is correspondingly set at the ventilation opening of the exhaust channel.

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