An air volume control system and a ventilation device

Abstract

The utility model discloses a kind of air volume control system and ventilation equipment, air volume control system includes: controller;Region exists sensor, with first cable, first cable is electrically connected with controller, region exists sensor is used to detect whether personnel exists in working chamber;Air volume regulating valve, including actuator, actuator has second cable, second cable is electrically connected with controller, air volume regulating valve can switch between first state and second state;Wherein, the air volume of air volume regulating valve in first state is greater than the air volume of air volume regulating valve in second state;Explosion-proof box, explosion-proof box defines explosion-proof cavity, controller is set in explosion-proof cavity;Multiple explosion-proof connecting pieces, first cable and second cable are respectively threaded in corresponding explosion-proof connecting piece.The utility model's air volume control system realizes the bistable control of large air volume when there is someone, small air volume when no one, greatly reduces energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of ventilation equipment technology, and in particular to an air volume control system and ventilation equipment. Background Technology

[0002] A ventilation room is a walk-in fume hood, an extra-large ventilation and safety device that allows operators to walk inside. It is specifically designed for handling large, complex experimental setups or those producing large amounts of hazardous gases that cannot be contained in conventional fume hoods. For example, when experiments require the use of tall reaction vessels, distillation columns, ovens, small pilot-scale units, or the assembly of complex piping systems, conventional fume hoods (typically around 1 meter deep) are simply unsuitable. Walk-in fume hoods provide a small room-like space (typically 2 meters or more deep and reaching the ceiling), allowing these large devices to operate in a controlled and safe environment.

[0003] In existing technologies, ventilation chambers are typically 2.5 meters or wider, with some reaching 6 meters. Therefore, the viewing window components are usually multi-pane sliding doors rather than vertical doors. For fume hoods less than 2 meters wide, vertical sliding doors can be used. A height / displacement sensor for the viewing window can be fixed to the vertical sliding door or counterweight, allowing for energy-saving control of the exhaust volume based on the window opening. Alternatively, because of the smaller width of these fume hoods, face velocity sensors are representative; face velocity sensors can be installed on the fume hood's uprights to detect the wind speed at the entrance opening, and energy savings can be achieved by controlling the exhaust volume.

[0004] However, when the width of the ventilation room exceeds 2 meters (e.g., a walk-in fume hood), the wind speed measured by the face velocity sensor cannot represent the speed at the opening, resulting in a poor linear relationship between the two. Furthermore, ventilation rooms typically use sliding doors, making it impossible to install door magnets, displacement, or height sensors, rendering conventional opening-linked control schemes infeasible. Therefore, large-sized walk-in fume hoods (i.e., ventilation rooms) generally employ a constant air volume system for control, operating with the same constant exhaust volume regardless of whether there are people present or not, or whether the sliding doors are open or closed.

[0005] Therefore, the constant air volume system used in existing ventilation rooms has high energy consumption and causes a lot of energy waste because it does not have the function of air volume adjustment, and it urgently needs to be improved. Utility Model Content

[0006] The purpose of this invention is to solve the problem of high energy consumption caused by the lack of airflow regulation function in the constant airflow systems used in existing ventilation rooms. This invention provides an airflow control system and ventilation equipment. The airflow control system of this invention achieves bisteady control with high airflow when people are present and low airflow when no one is present, greatly reducing energy consumption.

[0007] To address the aforementioned technical problems, this utility model discloses an airflow control system, comprising: a controller; a region presence sensor having a first cable electrically connected to the controller, the region presence sensor being used to detect the presence of personnel within the working chamber; an airflow regulating valve including an actuator having a second cable electrically connected to the controller, the airflow regulating valve being switchable between a first state and a second state; wherein the airflow of the airflow regulating valve in the first state is greater than the airflow of the airflow regulating valve in the second state; an explosion-proof box defining an explosion-proof cavity, the controller being disposed within the explosion-proof cavity; and multiple explosion-proof connectors, the first cable and the second cable respectively passing through corresponding explosion-proof connectors.

[0008] By employing the above technical solution, the embodiments of this application can detect the presence of personnel in the working chamber in real time using a regional presence sensor, and the controller automatically controls the airflow regulating valve to switch between a first state (i.e., high airflow state) and a second state (i.e., low airflow state) based on the detection results. In other words, when the regional presence sensor detects personnel operation, the airflow regulating valve accelerates ventilation at a high airflow rate to ensure face velocity, prevent pollutant overflow, and ensure personnel safety; when the regional presence sensor detects no personnel operation, the airflow regulating valve exhausts air at a low airflow rate. Therefore, the airflow control system of this application embodiment can ensure sufficient ventilation when personnel are present and reduce airflow when no personnel are present, achieving a balance between energy saving and safety.

[0009] For example, those skilled in the art will understand that the airflow control system in this application embodiment refers to a bistable system. That is, the bistable system in this application embodiment is an airflow control system that includes two different airflow levels (such as the large airflow and small airflow levels mentioned above). Compared with a constant airflow system, the bistable system can reduce the airflow to achieve energy saving under preset conditions (such as when a sensor detects the presence of personnel in the working chamber), and the energy saving effect is better than that of a constant airflow system.

[0010] By adopting the above technical solution, the embodiments of this application can encapsulate the controller in the explosion-proof cavity of the explosion-proof box, and at the same time seal and explosion-proof the first cable and the second cable through explosion-proof connectors, so that the entire air volume control system is suitable for flammable and explosive environments (such as explosion-proof ventilation equipment), significantly improving the safety level of the system.

[0011] According to another specific embodiment of the present invention, an air volume control system is disclosed, which further includes a third cable, which is threaded through the corresponding explosion-proof connector and electrically connected to the controller, and the third cable is used to supply power to the controller.

[0012] By adopting the above technical solution, the embodiments of this application can provide stable power supply to the controller through a third cable, and the cable is also run through an explosion-proof connector, which ensures the integrity and safety of the power supply line under explosion-proof requirements and avoids the risk of sparks or explosions caused by line joints.

[0013] According to another specific embodiment of the present invention, an air volume control system is disclosed. The air volume control system further includes a human-machine interface screen with a fourth cable, the fourth cable being electrically connected to the controller. The human-machine interface screen is used to display and / or set the air volume, face width value, or face wind speed.

[0014] By adopting the above technical solution, the embodiments of this application can display key parameters such as current air volume, face width or face velocity in real time through the human-machine interface screen, and allow operators to modify the set values ​​on site. At the same time, the fourth cable is connected to the controller through the explosion-proof connector to ensure safe and convenient human-machine interaction in the explosion-proof area (such as explosion-proof ventilation equipment).

[0015] According to another specific embodiment of the present invention, an air volume control system is disclosed. The air volume control system further includes a fifth cable, which is threaded through the corresponding explosion-proof connector and electrically connected to the controller. The controller is used to electrically connect to a lighting device through the fifth cable.

[0016] By adopting the above technical solution, the embodiments of this application enable the controller to be electrically connected to the lighting device through the fifth cable, thereby automatically controlling the lighting to turn on and off according to the presence of personnel or ventilation needs in the working chamber, further optimizing energy management. In addition, the fifth cable is also explosion-proof, ensuring the explosion-proof safety of the lighting control circuit.

[0017] According to another specific embodiment of the present invention, an air volume control system is disclosed, wherein the number of air volume regulating valves includes a plurality of valves, and the second cable of the actuator of each air volume regulating valve is passed through a corresponding explosion-proof connector and electrically connected to the controller.

[0018] By adopting the above technical solution, the embodiments of this application can support multiple air volume regulating valves to be connected in parallel to the same controller. The second cable of each actuator is electrically connected to the controller through an independent explosion-proof connector, thereby realizing the coordinated control of multiple areas or multiple ventilation openings and expanding the application capability of the air volume control system of this application in large-capacity ventilation equipment.

[0019] According to another specific embodiment of the present invention, an air volume control system is disclosed. The air volume regulating valve is configured to be in a first state when a sensor in the area detects the presence of personnel in the working chamber, and to be in a second state when a sensor in the area does not detect the presence of personnel in the working chamber.

[0020] By adopting the above technical solution, the embodiments of this application can automatically switch to the first state (high air volume) when the sensor detects personnel in the area, ensuring personnel safety and ventilation effect; or, when the sensor does not detect personnel in the area, it can automatically switch to the second state (low air volume), reducing energy consumption and noise, and realizing intelligent, unattended energy-saving operation.

[0021] The present invention also discloses a ventilation device, comprising: an air volume control system as described in any of the above embodiments; a cabinet having a working chamber, wherein a regional presence sensor is disposed facing the working chamber, and the air volume regulating valve is connected to the working chamber.

[0022] By adopting the above technical solution, the embodiment of this application can integrate the air volume control system into the ventilation equipment. The area presence sensor is set facing the working chamber, and the air volume regulating valve is connected to the working chamber, thereby forming a complete and automated ventilation control device, which effectively improves the safety and operating efficiency of the ventilation equipment and reduces the energy consumption of the ventilation equipment.

[0023] According to another specific embodiment of the present invention, a ventilation device is disclosed, wherein the cabinet further includes a fluid channel, the fluid channel has a vent, and the fluid channel is connected to the working chamber, the air volume regulating valve is disposed at the vent and is connected to the fluid channel, and the controller and the area presence sensor are both disposed on the top of the cabinet.

[0024] By adopting the above technical solution, the embodiments of this application can arrange the controller and the area presence sensor on the top of the cabinet to avoid occupying the effective space of the working chamber. At the same time, the air volume regulating valve is set at the vent of the fluid channel to ensure reasonable airflow organization. The overall structure is compact and easy to maintain.

[0025] According to another specific embodiment of the present invention, a ventilation device is disclosed, the ventilation device further comprising: a window assembly disposed on the front wall of the cabinet, the window assembly being capable of opening in a first direction to form a front opening open to the indoor environment; and a lighting device disposed in the working cavity, the controller being electrically connected to the lighting device via a fifth cable.

[0026] By adopting the above technical solution, the embodiments of this application can realize the flexible opening and closing of the front opening through the window component, which facilitates operation and observation. At the same time, the lighting device is controlled by the controller and can automatically illuminate the working chamber when needed, improving the working environment.

[0027] According to another specific embodiment of the present invention, a ventilation device is disclosed, the ventilation device further comprising: a junction box, wherein the controller is electrically connected to the junction box via a third cable, the junction box being used for electrical connection to the main power supply line; and a plurality of explosion-proof plugs disposed in the cabinet, each of the explosion-proof plugs having a sixth cable, the sixth cable being electrically connected to the junction box.

[0028] By adopting the above technical solution, the embodiments of this application can be connected to the external main power supply through the junction box, and provide a sixth cable connection for multiple explosion-proof plugs on the cabinet, thereby providing a safe power interface for external equipment or tools while meeting explosion-proof requirements, and expanding the functionality and ease of use of the ventilation equipment.

[0029] 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

[0030] Figure 1 This is a perspective view of an embodiment of the air volume control system and ventilation equipment of the present invention;

[0031] Figure 2 A perspective view of an embodiment of the air volume control system of the present invention is shown;

[0032] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the air volume control system and ventilation equipment of the present invention;

[0033] Figure 4 This diagram illustrates the electrical composition of an airflow control system and ventilation equipment according to an embodiment of the present invention. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] 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.

[0039] 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.

[0040] refer to Figure 1This application provides a ventilation device 100, including: an airflow control system (i.e., a bistable system 110), a cabinet 120, a window assembly 130, and a lighting device 140. Exemplarily, the ventilation device 100 of this application is a walk-in ventilation room. Wherein, as... Figure 1 As shown, the cabinet 120 of the ventilation device 100 has a working chamber 121, and a front opening 121a is formed on the front side of the working chamber 121, opening to the indoor environment. Exemplarily, the front opening 121a serves as an entrance for personnel to enter the working chamber 121 from the outside. A viewing window assembly 130 is disposed on the front wall 122 of the cabinet 120, and the viewing window assembly 130 is oriented along a first direction (e.g., the width direction of the cabinet 120, such as...). Figure 1 (As shown in the X direction) Move to the left or right.

[0041] Continue to refer to Figure 1 In this embodiment of the ventilation equipment 100, a bistable system 110 is further provided on the cabinet 120. The bistable system 110 is installed on the ventilation equipment (e.g., the ventilation equipment 100 described above) so that the ventilation equipment can control the airflow regulating valve 112 to switch between a first state and a second state via the controller 118 in the bistable system 110. When someone is present, sufficient airflow is provided to ensure operational safety; when no one is present, the airflow is reduced to achieve energy saving, effectively and completely blocking the escape path of harmful media inside the cabinet, thus ensuring the safety of operators from the source. However, this is not a limitation, and this application does not specifically limit the application scenarios of the bistable system 110. The airflow of the airflow regulating valve 112 in the first state is greater than the airflow of the airflow regulating valve 112 in the second state. It can be understood that the first state corresponds to a high airflow state, and the second state corresponds to a low airflow state.

[0042] For example, the exhaust volume in the high air volume state of this application embodiment is the total exhaust volume calculated by ensuring that the face velocity is greater than or equal to 0.5 m / s when the window component 130 is opened (e.g., a door, or a pair of double doors); and the exhaust volume in the low air volume state of this application embodiment is the total exhaust volume calculated by ensuring that the number of air exchanges in the cabinet is greater than 150 times, that is, the volume of the cabinet multiplied by 150.

[0043] Among them, such as Figure 1 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 airflow regulating valve 112 of the bistable 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 can be specifically set according to the actual situation.

[0044] The following is combined with Figures 2 to 4 The bistable system 110 provided in the embodiments of this application will be described in detail.

[0045] like Figure 2 and combined Figure 3 As shown, this application embodiment provides a bistable system 110. The bistable system 110 includes: a controller 118, a regional presence sensor 111, and an airflow regulating valve 112.

[0046] For example, the bistable system 110 of this application embodiment also includes an explosion-proof box 114 and an explosion-proof connector 115. The explosion-proof box 114 and the airflow regulating valve 112 are both located on the top of the cabinet 120. The explosion-proof box 114 is spaced apart from the fluid channel 123. The explosion-proof box 114 is connected to the airflow regulating valve 112, and the explosion-proof box 114 is connected to the area presence sensor 111 via the explosion-proof connector 115. The airflow regulating valve 112 is connected to the working chamber 121.

[0047] By adopting the above technical solution, the controller 118 and the area presence sensor 111 can be arranged on the top of the cabinet 120 to avoid occupying the effective space of the working chamber 121. At the same time, the air volume regulating valve 112 is set at the vent of the fluid channel 123 to ensure reasonable airflow organization. The overall structure is compact and easy to maintain.

[0048] For example, the airflow regulating valve 112 in this application embodiment has the function of airflow regulation and is an explosion-proof and intrinsically safe electrical device. Figure 2 As shown, the airflow regulating valve 112 includes an actuator 1121 and a valve body 1122. Furthermore, in this embodiment, the airflow regulating valve 112 uses the actuator 1121 to regulate the airflow, and the actuator 1121 is explosion-proof.

[0049] like Figure 2 As shown, the valve body 1122 includes a blade 1123 disposed within the valve body 1122, and the valve body 1122 has a direction along a second direction (e.g., the height direction of the cabinet 120, such as...). Figure 2 The valve body 1122 extends along the second direction Z (as shown in the Z-direction). Both ends of the valve body 1122 have openings communicating with the inner cavity 1124. The blade 1123 can rotate within the valve body 1122 to adjust the opening degree of the valve body 1122. An actuator 1121 is located outside the valve body 1122 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 1123 for driving the blade 1123 to rotate.

[0050] For example, the explosion-proof box 114 in this embodiment is rectangular in shape, but the specific structure of the explosion-proof box 114 is not limited in this embodiment. For example, it can also be a cube or a sphere. Furthermore, the explosion-proof connector 115 in this embodiment is an explosion-proof flexible connector. However, this is not a limitation, and the structure of the explosion-proof connector 115 is not specifically limited in this embodiment.

[0051] refer to Figure 2 and Figure 3 In this embodiment of the application, the explosion-proof box 114 defines an explosion-proof cavity, and the controller 118 is disposed in the explosion-proof cavity. The area presence sensor 111 has a first cable 113, which passes through the explosion-proof connector 115. One end of the first cable 113 is connected to the area presence sensor 111, and the other end of the first cable 113 extends into the explosion-proof box 114 and is connected to the controller 118, so that the controller 118 is electrically connected to the area presence sensor 111 through the first cable 113. The area presence sensor 111 is used to detect the movement of personnel 300 in the working cavity 121.

[0052] Therefore, when the area presence sensor 111 detects the presence of a person 300 in the working chamber 121, the controller 118 receives a signal sent by the area presence sensor 111 (e.g., a high-level signal indicating that someone is in the cabinet), and the controller 118 sends a high airflow command to the airflow regulating valve 112, controlling the airflow regulating valve 112 to be in the first state, and the airflow regulating valve 112 executes a high airflow; when the area presence sensor 111 does not detect the presence of a person 300 in the working chamber 121, the controller 118 receives a signal sent by the area presence sensor 111 (e.g., a low-level signal indicating that no one is in the cabinet), and the controller 118 sends a low airflow command to the airflow regulating valve 112, controlling the airflow regulating valve 112 to be in the second state, and the airflow regulating valve 112 executes a low airflow.

[0053] In other words, this application provides a bistable system 110 that uses a regional presence sensor 111 to detect people in the working chamber 121 and automatically switches the air volume according to whether there are people in the working chamber 121. The bistable system 110 can be applied to the ventilation equipment 100 to solve the problem that the bistable system used in the ventilation equipment in the prior art does not have the function of air volume adjustment, resulting in high energy consumption.

[0054] For example, in this embodiment of the application, the area presence sensor 111 is installed on the top of the cabinet 120 and located inside the working cavity 121. The area presence sensor 111 has a scanning probe head facing inward to detect whether there are personnel inside the working cavity 121. However, it is not limited to this. This embodiment of the application does not specifically limit the setting position of the area presence sensor 111. In some other possible implementations, for example, the area presence sensor 111 can also be set outside the working cavity 121, as long as the scanning probe head of the area presence sensor 111 is set facing inward to prevent the movement of personnel in the passage outside the cabinet 120 from being mistaken for someone inside the cabinet.

[0055] Continue to refer to Figure 2 The actuator 1121 of the airflow regulating valve 112 has a second cable 1125, which is electrically connected to the controller 118. Exemplarily, the airflow regulating valve 112 is an exhaust valve, and the second cable 1125 passes through the explosion-proof connector 115. Thus, the controller 118 can connect to the airflow regulating valve 112 via the second cable 1125 and the explosion-proof connector 115 to control the exhaust volume of the airflow regulating valve 112. Specifically, the controller 118 adjusts the exhaust volume of the airflow regulating valve 112 according to its current state (e.g., a first state or a second state), ensuring that the ventilation equipment 100 meets safe exhaust requirements and achieves a balance between energy saving and safety.

[0056] Furthermore, when the controller 118 is connected to the explosion-proof equipment via different cables (e.g., the first cable 113 or the second cable 1125), the explosion-proof connector 115, 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 box 114 and the actuator 1121 of the airflow regulating valve 112) at both ends of the explosion-proof connector 115, and flames (or pressure) enter the explosion-proof connector 115, it can withstand the pressure and cool the flames, preventing the explosion from propagating to the other explosion-proof device (e.g., the actuator 1121), ensuring the integrity of the entire explosion-proof circuit.

[0057] It is understood that the embodiments of this application enclose a device (e.g., controller 118) that may ignite an explosive gas mixture within a housing (i.e., explosion-proof box 114). The explosion-proof box 114 can withstand the internal explosion of a flammable mixture that penetrates through any of its joint surfaces or structural gaps without damage, and will not ignite an externally formed explosive atmosphere; that is, the explosion-proof box 114 is explosion-proof and does not propagate the explosion. Simultaneously, the cables (e.g., the first cable 113 or the second cable 1125, etc.) are sealed and explosion-proofed using explosion-proof connectors 115, making the entire bistable system 110 suitable for flammable and explosive environments (such as explosion-proof ventilation equipment), significantly improving the system's safety level.

[0058] For example, such as Figure 3 and combined Figure 2 As shown, the bistable system 110 in this embodiment further includes a third cable 116, a fourth cable 1171, and a fifth cable 141. Wherein, as... Figure 2 and Figure 3 As shown, the third cable 116 is threaded through the corresponding explosion-proof connector 115 and electrically connected to the controller 118, enabling an external power source to be electrically connected to the controller 118 via the third cable 116. The third cable 116 is used to supply power to the controller 118. Furthermore, the third cable 116 is also threaded through the explosion-proof connector 115, ensuring the integrity and safety of the power supply line under explosion-proof requirements and avoiding the risk of sparks or explosions caused by line joints.

[0059] For example, such as Figure 2 and combined Figure 1 As shown, the bistable system 110 of this application embodiment also includes a human-machine interface screen 117, which is disposed on the cabinet 120 so that the user can read the air volume information (such as air volume value, high / low air volume status, etc.) output by the human-machine interface screen 117 or input control commands to adjust the exhaust volume of the air volume regulating valve 112.

[0060] like Figure 2 and Figure 3 As shown, the lighting device 140 is installed inside the working chamber 121, and one end 142 of the lighting device 140 extends out of the top of the cabinet 120, that is, one end 142 of the lighting device 140 extends out of the inner lining plate 124. The fifth cable 141 is threaded through the corresponding explosion-proof connector 115 and connected to the controller 118 (see...). Figure 4 The fifth cable 141 is also explosion-proof, ensuring the explosion-proof safety of the lighting control circuit.

[0061] For example, such as Figure 2As shown, the ventilation device 100 of this embodiment further includes a junction box 150 and four explosion-proof plugs 160. The junction box 150 is located on the top of the cabinet 120, and the four explosion-proof plugs 160 are spaced apart and terminated on the rear wall of the cabinet 120. The junction box 150 is used for electrical connection to the main power supply line 200, and the controller 118 is electrically connected to the junction box 150 via a third cable 116, so that an external power source can sequentially supply power to the controller 118 through the main power supply line 200, the junction box 150, and the third cable 116. Each explosion-proof plug 160 has a sixth cable 161, and the sixth cable 161 is electrically connected to the junction box 150. Therefore, the ventilation device 100 of this embodiment can provide a safe power supply interface for external devices or tools while meeting explosion-proof requirements, expanding the functionality and ease of use of the ventilation device 100.

[0062] This application does not specify the number of explosion-proof pins 160 in its embodiments. In other possible implementations, the number of explosion-proof pins 160 can be one, two, three, or more. Furthermore, all explosion-proof pins 160 in this application embodiment must be selected according to explosion-proof standards (such as GB 3836 series) and be of the corresponding explosion-proof type, such as flameproof type. It is prohibited to reserve non-explosion-proof electrical interfaces, thus systematically eliminating ignition sources from an electrical perspective.

[0063] In the above embodiments, the number of airflow regulating valves 112 in the bistable system 110, fluid channels 123 in the ventilation equipment 100, and lighting devices 140 are all two. However, this application is not limited to this. The embodiments of this application do not specifically limit the number of airflow regulating valves 112, fluid channels 123, and lighting devices 140 in the bistable system 110. In other possible implementations, for example, the number of airflow regulating valves 112 may be two, three, four, or more, the corresponding number of fluid channels 123 may be two, three, four, or more, and the number of lighting devices 140 may be two, three, four, or more. Thus, the ventilation equipment 100 of the embodiments of this application can realize the coordinated control of multiple areas or multiple ventilation openings, expanding the application capability of the bistable system 110 in large-capacity ventilation equipment 100.

[0064] In summary, this application applies a bistable system to ventilation equipment, enabling the equipment to control the airflow regulating valve between a first and second state via a controller within the bistable system. This regulates the exhaust volume of the airflow regulating valve, providing sufficient airflow to ensure operational safety when personnel are present, while reducing airflow to save energy when no one is present. This effectively blocks the escape path of harmful media from the cabinet, ensuring operator safety from the source. Furthermore, by using a regional presence sensor in the bistable system to detect personnel within the working chamber, the system achieves bistable control—high airflow when present and low airflow when unoccupied—significantly reducing energy consumption. Simultaneously, the explosion-proof design of components such as explosion-proof boxes and connectors ensures that the bistable system and ventilation equipment of this application can be safely applied in flammable and explosive environments.

[0065] 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 airflow control system applied to ventilation equipment, the ventilation equipment having a working chamber, characterized in that, include: Controller; A region presence sensor has a first cable that is electrically connected to the controller. The region presence sensor is used to detect whether there are personnel inside the working chamber. An airflow regulating valve includes an actuator having a second cable electrically connected to a controller. The airflow regulating valve is capable of switching between a first state and a second state, wherein the airflow of the airflow regulating valve in the first state is greater than the airflow of the airflow regulating valve in the second state. An explosion-proof box, the explosion-proof box defining an explosion-proof cavity, and the controller disposed in the explosion-proof cavity; Multiple explosion-proof connectors are provided, and the first cable and the second cable are respectively passed through the corresponding explosion-proof connectors.

2. The air volume control system according to claim 1, characterized in that, The air volume control system also includes: The third cable is threaded through the corresponding explosion-proof connector and electrically connected to the controller. The third cable is used to supply power to the controller.

3. The air volume control system according to claim 1, characterized in that, The air volume control system also includes: The human-machine interface screen has a fourth cable, which is electrically connected to the controller. The human-machine interface screen is used to display and / or set the air volume, face width value or face wind speed.

4. The air volume control system according to claim 1, characterized in that, The air volume control system also includes: The fifth cable is threaded through the corresponding explosion-proof connector and electrically connected to the controller, which is used to electrically connect to the lighting device via the fifth cable.

5. The air volume control system according to any one of claims 1 to 4, characterized in that, The number of air volume regulating valves includes multiple valves, and the second cable of the actuator of each air volume regulating valve is passed through the corresponding explosion-proof connector and electrically connected to the controller.

6. The air volume control system according to claim 1, characterized in that, The airflow regulating valve is configured to be in a first state when a sensor in the area detects the presence of a person in the working chamber, and to be in a second state when a sensor in the area does not detect the presence of a person in the working chamber.

7. A ventilation device, characterized in that, include: The air volume control system according to any one of claims 1-6; The cabinet has a working chamber, and a sensor is positioned facing the working chamber in the area. The airflow regulating valve is connected to the working chamber.

8. The ventilation equipment according to claim 7, characterized in that, The cabinet also includes a fluid channel with a vent, and the fluid channel is connected to the working chamber. The air volume regulating valve is located at the vent and is connected to the fluid channel. The controller and the area presence sensor are both located on the top of the cabinet.

9. The ventilation equipment according to claim 7, characterized in that, The ventilation equipment also includes: A window assembly is disposed on the front wall of the cabinet, and the window assembly is capable of opening in a first direction to form a front opening that opens to the interior environment; A lighting device is installed inside the working chamber, and the controller is electrically connected to the lighting device via a fifth cable.

10. The ventilation equipment according to claim 7, characterized in that, The ventilation equipment also includes: A junction box, wherein the controller is electrically connected to the junction box via a third cable, and the junction box is used to be electrically connected to the main power supply line; Multiple explosion-proof plugs are installed in the cabinet, and each explosion-proof plug has a sixth cable, which is electrically connected to the junction box.

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