Temperature control fan control box and system thereof

Abstract

This application discloses a temperature-controlled fan control box and system, belonging to the technical field of fan control boxes. The temperature-controlled fan control box includes a housing, and a power module, a control and protection switch, a thermostat, and a relay integrated inside the housing. The power module's input terminal is connected to an external power source, and its output terminal is connected to the power input terminal of the control and protection switch. The output terminal of the control and protection switch is connected to both the thermostat's power input terminal and the relay coil's power supply terminal. The thermostat's signal output terminal is connected to the relay coil's control terminal to output a start / stop signal. The relay's normally open contact terminal is connected to the fan interface on the housing to control the fan's power supply. This application solves the problems of messy wiring, inconvenient operation, insufficient intelligence, and significant safety risks in traditional temperature-controlled fan systems. It combines integration, intelligence, and portability, making it suitable for small working environments such as laboratories.

Description

Technical Field

[0001] This application belongs to the technical field of fan control boxes, and specifically relates to a temperature-controlled fan control box and its system. Background Technology

[0002] In modern industrial production, laboratories, and small work environments, temperature-controlled fan systems are widely used for temperature regulation and air circulation control. Their stable operation is crucial for accurate control of ambient temperature and equipment safety.

[0003] Traditional temperature-controlled fan systems typically employ a dispersed arrangement of components such as temperature controllers and relays, controlled via temporary on-site wiring. This approach has several drawbacks: First, the wiring is chaotic, with haphazardly placed wires affecting the cleanliness of the operating environment and increasing the risk of short circuits due to friction and aging, posing serious safety hazards. Second, operation is inconvenient, as temperature controllers and relays are often scattered on the floor or desktop, lacking unified integration. Operators must switch between multiple components, increasing the risk of misoperation. Third, there is a lack of intelligence; the fans are often in a continuously running state and cannot automatically start and stop based on changes in ambient temperature, resulting in significant energy waste. Furthermore, prolonged full-load operation shortens the fan's lifespan. Fourth, safety risks are prominent, as exposed wires and scattered electrical components can easily cause electrical fires or electric shocks, especially in environments with high safety requirements such as laboratories.

[0004] In recent years, with the development of the Internet of Things and intelligent control technology, integrated temperature control systems have gradually emerged in the industry. These systems achieve precise temperature control and operational status monitoring through intelligent controllers and sensors. However, existing solutions are mostly designed for large industrial equipment, which are bulky and fixed in installation. They are difficult to adapt to the portability and flexibility requirements of laboratories and small working environments. There is a lack of a small temperature control fan control device that combines integration, intelligence, portability, and high safety. Utility Model Content

[0005] The purpose of this application is to provide a temperature-controlled fan control box and system therein, to solve the problems mentioned in the background art, such as messy wiring, inconvenient operation, insufficient intelligence, prominent safety hazards, and lack of portability in existing integrated systems.

[0006] To achieve the above objectives, this application adopts the following technical solution: A temperature-controlled fan control box includes a housing, and further includes a power module, a control and protection switch, a temperature controller, and a relay integrated inside the housing; The input terminal of the power module is used to connect to an external power source, and its output terminal is connected to the power input terminal of the control and protection switch. The output terminal of the control and protection switch is connected to the power input terminal of the temperature controller and the coil power supply terminal of the relay; The signal output terminal of the temperature controller is connected to the coil control terminal of the relay for outputting start / stop control signals; The normally open contact terminal of the relay is connected to the fan interface located on the housing, and is used to control the power supply and power-off of the fan.

[0007] In one possible implementation, the temperature controller is a digital temperature controller, with an upper screen for displaying the detected temperature in real time, a lower screen for displaying and setting the target temperature, and an up button and a down button for adjusting the set temperature.

[0008] In one possible implementation, the power supply module is an AC-DC conversion module used to convert a 220V AC input voltage into a 12V DC output voltage and to power the coils of the temperature controller and the relay.

[0009] In one possible implementation, the relay is an electromagnetic relay or a solid-state relay.

[0010] In one possible implementation, the housing is made of flame-retardant material and has heat dissipation grilles on its top and sides.

[0011] In one possible implementation, the front and sides of the housing are provided with mounting holes.

[0012] In one possible implementation, the fan interface is a terminal block located on the back of the housing.

[0013] In one possible implementation, the overload protection threshold of the power module is 1.2-1.5 times its rated output current.

[0014] In a second aspect, a temperature-controlled fan system is provided, including a fan and the temperature-controlled fan control box described in the first aspect, wherein the power cord of the fan is connected to the normally open contact terminal of the relay through the fan interface.

[0015] Compared with the prior art, this application has the following beneficial effects: This application provides a temperature-controlled fan control box that integrates the core control components into a single housing, changing the traditional model of scattered system components and temporary on-site wiring. This solves the problem of messy wiring, reduces exposed wires, and lowers the risk of electrical fires and electric shocks. The integrated design makes the control box compact, easy to carry and move in small environments such as laboratories, and adaptable to various scenarios. At the same time, the automatic start and stop of the fan is achieved through the linkage of the temperature controller and the relay, avoiding energy waste caused by the fan running continuously for a long time, extending the service life of the fan, and balancing safety, intelligence, and portability.

[0016] In one possible implementation, two relay options are provided to enable the control box to adapt to different scenario requirements: electromagnetic relays are low-cost and highly versatile, meeting the needs of conventional scenarios and reducing equipment costs; solid-state relays have fast response and no electromagnetic interference, adapting to precision experimental environments and improving scenario compatibility; both types of relays are compatible with 12V power supply, ensuring reliable operation, avoiding fan malfunction due to relay failure, and extending relay lifespan to ensure long-term stable operation of the control box.

[0017] In one possible implementation, the heat dissipation grille effectively solves the heat dissipation problem caused by long-term operation of the internal components of the control box, prevents the components from aging or being damaged due to high temperature, extends the service life of the equipment, and ensures the stable operation of the system.

[0018] In one possible implementation, the rear terminal block centralizes and organizes the fan wiring, solving the problem of messy traditional field wiring, improving wiring standardization, and reducing the risk of short circuits or poor contact caused by wiring errors. Clear markings help operators quickly distinguish wiring types, reducing wiring difficulty and improving wiring efficiency. The tin-plated brass terminals have good conductivity and strong corrosion resistance, ensuring reliable contact during long-term use, avoiding overheating due to poor contact, and ensuring the safe and stable operation of the equipment. Attached Figure Description

[0019] Figure 1 A schematic diagram of a temperature-controlled fan control box provided in this application.

[0020] Figure 2 This is a schematic diagram of a temperature-controlled fan control system provided in this application.

[0021] The attached diagram is labeled as follows: 1. Housing; 2. Heat dissipation grille; 3. Temperature controller; 4. Relay; 5. Power module; 7. Mounting hole; 8. Control and protection switch. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] like Figure 1 As shown, this application discloses a temperature-controlled fan control box, which may include a housing 1, and further include a power module 5, a control and protection switch 8, a temperature controller 3, and a relay 4 integrated inside the housing 1.

[0029] Optionally, the outer casing 1 of the temperature-controlled fan control box adopts a cuboid structure, is made of flame-retardant metal, and has dimensions of 280mm×255mm×180mm, ensuring a compact structure and easy portability. The casing 1 integrates a power module 5, a control and protection switch 8, a temperature controller 3, and a relay 4, with all components neatly connected via insulated wires.

[0030] The input terminal of the power module 5 is used to connect to an external power source, and its output terminal is connected to the power input terminal of the control and protection switch 8.

[0031] Optionally, the power module 5 input terminal can be connected to 220V AC mains power.

[0032] The output of the control and protection switch 8 is connected in two ways: one to the power input of the thermostat 3 and the other to the power supply of the relay coil 4. The signal output of the thermostat 3 is connected to the control terminal of the relay coil 4 via a signal line, and the normally open contact terminal of the relay 4 is connected to the fan interface on the housing 1 via internal wiring.

[0033] In use, the external power supply powers the temperature controller 3 and the relay 4 through the power module 5 and the control and protection switch 8. The temperature controller 3 detects the ambient temperature and outputs a control signal. The relay 4 controls the power supply to and from the fan interface according to the signal, thereby adjusting the operation of the fan.

[0034] In this embodiment, by integrating the core control components into the same housing 1, the traditional system with dispersed components and temporary on-site wiring is changed, solving the problem of messy wiring, reducing exposed wire harnesses, and lowering the risk of electrical fires and electric shocks. The integrated design makes the control box compact, easy to carry and move in small environments such as laboratories, and adaptable to the needs of the scenario. At the same time, the automatic start and stop of the fan is realized by the linkage of the temperature controller 3 and the relay 4, avoiding energy waste caused by the fan running for a long time, extending the service life of the fan, and taking into account safety, intelligence and portability.

[0035] Furthermore, the control and protection switch 8 is a rotary RDCPS control and protection switch 8, which has three states: on, tripped, and off.

[0036] Specifically, the control and protection switch 8 is a rotary RDCPS control and protection switch 8. The switch body is embedded in the front operating area of ​​the housing 1 and is equipped with a circular rotary knob. The knob surface is marked with "AUTO", "TRIP" and "OFF".

[0037] When the equipment is started, turn the knob to "AUTO" to turn on the control and protection switch 8, and the power is normally delivered to the temperature controller 3 and the relay 4.

[0038] When an internal overload or short circuit fault occurs, the switch automatically triggers protection, and the knob switches to "TRIP" to cut off the circuit. When maintenance is required, turn the knob to "OFF" to completely disconnect the circuit and ensure safe operation. After troubleshooting, turn the knob to "AUTO" to restore equipment operation.

[0039] In one possible embodiment, the temperature controller 3 is a digital temperature controller, with an upper screen for displaying the detected temperature in real time, a lower screen for displaying and setting the target temperature, and an up button and a down button for adjusting the set temperature.

[0040] Optionally, the digital temperature controller can be embedded in the center of the front of the housing 1, with a dual display screen: the upper screen is an LED temperature display area, connected to the PT100 temperature sensor built into the temperature controller 3, displaying the ambient temperature in real time with an accuracy of ±0.1℃; the lower screen is a target temperature display and setting area, which can display the preset temperature range, and the setting value can also be adjusted by the up and down buttons on the side of the controller. Pressing the up button increases the setting value in increments of 0.5℃; pressing the down button decreases the setting value in increments of 0.5℃.

[0041] For example, to adjust the target temperature from 25℃ to 28℃, simply press the up button 6 times consecutively. During the adjustment process, the current setting value will be displayed on the lower screen in real time.

[0042] In this embodiment, the dual-screen design of the digital temperature controller makes temperature information intuitive and clear. The upper screen displays the detected temperature in real time, while the lower screen facilitates setting and viewing the target temperature, solving the problems of unclear readings and complex operation of traditional temperature controllers. The up and down buttons simplify the temperature adjustment process, allowing operators to quickly complete the setting without professional skills, thus lowering the operational threshold. The high-precision temperature display ensures the accuracy of temperature control, enabling the fan to start and stop precisely according to the ambient temperature, improving the temperature regulation accuracy, and making it suitable for scenarios with high temperature control requirements, such as laboratories.

[0043] In one possible embodiment, the power module 5 is an AC-DC conversion module used to convert the 220V AC input voltage into a 12V DC output voltage and to power the coils of the thermostat 3 and the relay 4.

[0044] Optionally, the power module 5 can be an AC-DC conversion module. The main body of the module is installed in the inner corner of the housing 1, and the input end is equipped with a standard three-hole power interface, which can be directly plugged into a 220V AC power plug.

[0045] The power module 5 integrates rectification, filtering and voltage regulation circuits, which can stably convert 220V AC power to 12V DC power, and control the output voltage fluctuation range within ±0.3V.

[0046] The power module 5 has two outputs: one connects to the power input of the temperature controller 3 via a wire, supplying power to the display, sensor, and control circuit of the temperature controller 3; the other connects to the power supply of the relay 4 coil, providing drive power for the relay 4 coil to engage / disengage. The module also has a built-in overvoltage protection circuit, which automatically cuts off the output when the input voltage exceeds 250V to protect downstream components.

[0047] In this embodiment, the AC-DC conversion module achieves a stable conversion from 220V AC mains power to 12V DC power, accurately adapting to the operating voltage requirements of the temperature controller 3 and the relay 4, avoiding component burnout due to voltage mismatch, and ensuring stable equipment operation; the stable 12V output ensures the accuracy of temperature detection by the temperature controller 3 and the reliability of the control signal, reducing the probability of relay 4 malfunction; there is no need to configure separate power supplies for the temperature controller 3 and the relay 4, simplifying the power supply structure, further improving the integration level of the control box, reducing the complexity of external wiring, and indirectly reducing safety hazards.

[0048] In one possible embodiment, the relay 4 is an electromagnetic relay 4 or a solid-state relay 4.

[0049] Optionally, the relay 4 can be selected according to the application scenario: In a normal laboratory environment, an electromagnetic relay 4 is selected, with a coil voltage adapted to 12V DC and a rated current of 10A for normally open contact terminals, which can meet the power supply requirements of small fans with a power of ≤1.5kW.

[0050] In precision laboratories, solid-state relay 4 is selected, which is also compatible with 12V DC coil voltage, has a switching response time of ≤1ms, no electromagnetic radiation, and a service life of more than 100,000 cycles.

[0051] Both types of relays 4 are fixed to the metal bracket inside the housing 1 with screws. The coil end is connected to the output end of the control and protection switch 8, the control end is connected to the signal output end of the temperature controller 3, and the contact end is connected to the fan interface.

[0052] In this embodiment, two types of relays 4 are provided to enable the control box to adapt to different scenario requirements: the electromagnetic relay 4 is low in cost and highly versatile, meeting the needs of conventional scenarios and reducing equipment costs; the solid-state relay 4 has fast response and no electromagnetic interference, adapting to precision experimental environments and improving scenario compatibility; both types of relays 4 are compatible with 12V power supply, ensuring reliable operation, avoiding fan malfunction due to relay 4 failure, and extending the service life of relay 4 to ensure long-term stable operation of the control box.

[0053] In one possible embodiment, the housing 1 is made of flame-retardant material and has heat dissipation grilles 2 on its top and sides.

[0054] Specifically, the outer casing 1 is made of flame-retardant ABS plastic, which can self-extinguish within 30 seconds when exposed to an open flame. A long, narrow heat dissipation grille 2 is located on the top of casing 1, with a total length of 200mm, a width of 15mm, and a spacing of 5mm. Honeycomb-shaped heat dissipation grilles 2 are located on both the left and right sides, with each honeycomb hole having a diameter of 8mm. The grille area occupies 30% of the side area. The edges of the heat dissipation grilles 2 are polished to remove sharp burrs, preventing scratches to operators. When the equipment is operating, the heat generated by the internal components is circulated with the outside air through the top and side grilles, keeping the internal temperature below 40℃.

[0055] In this embodiment, the flame-retardant outer shell 1 can effectively prevent the spread of flames, reduce the risk of fire and improve the fire safety of the equipment when an electrical fault causes an open flame; the heat dissipation grilles 2 on the top and sides increase the heat dissipation area, accelerate the dissipation of internal heat, prevent the performance of components such as the thermostat 3 and relay 4 from deteriorating or being damaged due to overheating, extend the life of the components, and ensure the long-term stable operation of the control box; the rounded edges of the grilles improve the safety of use and prevent operators from being injured during handling or operation, thus balancing safety and practicality.

[0056] In one possible embodiment, the housing 1 has mounting holes 7 on its front and sides.

[0057] Specifically, the outer casing 1 has two mounting holes 7 on the top and bottom edges of the front side and two mounting holes 7 on the middle of the left and right sides, for a total of eight mounting holes 7. The diameter of each hole is 6mm, and the inner wall of the hole is tapped with M5 internal thread.

[0058] During installation, if the control box needs to be fixed to a wall, use an M5 expansion bolt to drive it into the wall through the mounting hole 7. After tightening the bolt, the control box will be firmly attached to the wall. If the control box needs to be fixed to the surface of an equipment, simply use an M5 bolt to tighten it by passing it through the mounting hole 7 and engaging the threaded hole on the surface of the equipment. The mounting holes 7 are symmetrically distributed to ensure that the control box is evenly stressed after it is fixed, without tilting or shaking.

[0059] In this embodiment, the multi-position mounting holes 7 provide a flexible fixing method to meet different installation needs such as walls and equipment surfaces, and are suitable for the spatial layout of small environments such as laboratories; the bolt fixing ensures that the control box is installed firmly, avoids equipment shaking that could cause internal component wiring to loosen, and reduces the risk of failure; the standard hole diameter and internal thread design means that installation does not require additional processing, and operators can complete the installation using conventional tools, reducing the difficulty of installation and improving installation efficiency.

[0060] In one possible embodiment, the fan interface is a terminal block located on the back of the housing 1.

[0061] Specifically, the fan interface uses a 4-position terminal block, which is installed in the middle of the back of the housing 1. The terminal block surface is marked with "L", "N", "PE" and "Fan Signal" to facilitate the identification of wiring.

[0062] This terminal block is made of brass with a tin-plated surface. Each terminal has a rated current of 15A and is suitable for small fans with a power of ≤3kW.

[0063] When wiring, connect the live wire, neutral wire, and ground wire of the fan power cord to the "L", "N", and "PE" terminals of the terminal block respectively, and connect the fan control signal wire to the "Fan Signal" terminal. Then tighten the fixing screws on the terminal to ensure that the wires are in close contact with the terminal and there is no looseness.

[0064] In this embodiment, the rear terminal block makes the fan wiring centralized and orderly, solving the problem of messy wiring in traditional field, improving wiring standardization, and reducing the risk of short circuits or poor contact caused by wiring errors; clear markings help operators quickly distinguish wiring types, reduce wiring difficulty, and improve wiring efficiency; the brass tin-plated terminals have good conductivity and strong corrosion resistance, ensuring reliable contact during long-term use, avoiding overheating due to poor contact, and ensuring the electrical safety and stable operation of the equipment.

[0065] In one possible embodiment, the overload protection threshold of the power module 5 is 1.2-1.5 times its rated output current.

[0066] Optionally, the rated output current of power module 5 is 5A, and its overload protection threshold is set to 1.2 times the rated output current. The module integrates an overload protection circuit and monitors the output current in real time through a current sensor.

[0067] When an internal short circuit or wiring error causes the output current to exceed 6A, the overload protection circuit cuts off the output of power module 5 within 0.5 seconds. After the fault is cleared, turning off and then on the control and protection switch 8 resets the overload protection status of power module 5, restoring normal output. The overload protection threshold can be finely adjusted via an internal potentiometer. If a higher power component is required in actual use, the threshold can be adjusted to 1.5 times the rated output current.

[0068] In this embodiment, the overload protection threshold design of 1.2-1.5 times the rated current can not only avoid false triggering of protection due to short-term current fluctuations, ensuring normal start-up and operation of the equipment, but also quickly cut off the circuit in the event of continuous overload, protecting the power module 5 and downstream components such as the temperature controller 3 and relay 4, preventing damage to components due to long-term overload, and extending the overall life of the equipment; the finely adjustable threshold improves the adaptability of the equipment, allowing the protection parameters to be adjusted according to the power requirements of the actual connected components, expanding the scope of application, while the fast protection response speed reduces the risk of fault expansion and improves the electrical safety of the equipment.

[0069] In one possible embodiment, a temperature-controlled fan system is provided, including a fan and the aforementioned temperature-controlled fan control box, wherein the power cord of the fan is connected to the normally open contact terminal of the relay 4 through the fan interface.

[0070] Optionally, the temperature-controlled fan system may include a small centrifugal fan with a power of 800W.

[0071] During assembly, connect the fan power cord to the terminal block on the back of the control box, and connect the fan control signal line to the "fan signal" terminal of the terminal block; fix the control box to the laboratory wall through the mounting hole 7, and connect the power module 5 input terminal to 220V AC power.

[0072] In use, the target temperature range is set by the temperature controller 3. The temperature controller 3 detects the laboratory temperature. When the temperature exceeds 28°C, the output signal activates the relay 4, powering on the fan interface and causing the fan to run and cool the room. When the temperature is below 20°C, the relay 4 deactivates, and the fan stops running, thus achieving automatic temperature regulation.

[0073] In this embodiment, the system combines a fan with an integrated temperature control box, fully leveraging the advantages of the control box and addressing many shortcomings of traditional temperature-controlled fan systems. The fan is automatically started and stopped by the temperature controller 3, enabling precise temperature regulation in scenarios such as laboratories, avoiding energy waste from long-term fan operation and reducing operating costs. The flame-retardant shell 1, heat dissipation grille 2, and overload protection design of the control box provide multiple safety guarantees for system operation, reducing safety risks. Furthermore, the portability and flexible installation of the control box allow the system to quickly adapt to different small working environments, improving its applicability. Maintenance only requires inspection of the control box or the fan separately, reducing maintenance difficulty and costs.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A temperature controlled fan control box comprising a housing (1), characterized in that, Also includes: The power module (5), control and protection switch (8), temperature controller (3) and relay (4) are integrated inside the housing (1). The input terminal of the power module (5) is used to connect to an external power source, and its output terminal is connected to the power input terminal of the control and protection switch (8). The output terminal of the control and protection switch (8) is connected to the power input terminal of the temperature controller (3) and the coil power supply terminal of the relay (4); The signal output terminal of the temperature controller (3) is connected to the coil control terminal of the relay (4) for outputting start / stop control signals; The normally open contact terminal (NO) of the relay (4) is connected to the fan interface provided on the housing (1) for controlling the power on and power off of the fan.

2. The temperature controlled fan control box of claim 1, wherein, The temperature controller (3) is a digital temperature controller. Its upper screen is used to display the detected temperature in real time, and its lower screen is used to display and set the target temperature. It is also equipped with an up button and a down button for adjusting the set temperature.

3. The temperature controlled fan control box of claim 1, wherein, The power module (5) is an AC-DC conversion module used to convert the 220V AC input voltage into a 12V DC output voltage and to power the coils of the temperature controller (3) and the relay (4).

4. The temperature controlled fan control box of claim 1, wherein, The relay (4) is an electromagnetic relay or a solid-state relay.

5. The temperature controlled fan control box of claim 1, wherein, The outer shell (1) is made of flame-retardant material and has heat dissipation grilles (2) on its top and sides.

6. The temperature controlled fan control box of claim 1, wherein, The outer casing (1) has mounting holes (7) on its front and sides.

7. The temperature controlled fan control box of claim 1, wherein, The fan interface is a terminal block, which is located on the back of the housing (1).

8. The temperature controlled fan control box of claim 1, wherein, The overload protection threshold of the power module is 1.2-1.5 times its rated output current.

9. A temperature-controlled fan system, characterized in that, Includes a fan and a temperature-controlled fan control box as described in any one of claims 1 to 8, wherein the power cord of the fan is connected to the normally open contact terminal (NO) of the relay (4) through the fan interface.

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