An anti-interference temperature sensing detector

Abstract

This invention provides an anti-interference temperature detector, relating to the field of temperature detector technology. The invention includes a vertical rod fixedly mounted on the top surface of a housing. A sliding plate is slidably connected to the outer wall surface of the vertical rod, and a shielding cover is fixedly mounted on the side of the sliding plate. A circular mounting base is fixedly mounted on the top surface of the housing, and an annular limiting groove is formed on the surface of the circular mounting base. Through the shielding device, the detector head assembly is completely enclosed by the shielding cover. Combined with the sealing structure within the annular limiting groove, this invention effectively blocks strong electromagnetic radiation generated by equipment such as motors and frequency converters in industrial environments, reducing the impact of electromagnetic interference on the temperature acquisition signal, avoiding false alarms caused by signal distortion, ensuring that the detector only responds to true temperature anomalies, and improving monitoring accuracy and reliability.

Description

Technical Field

[0001] This utility model relates to the field of temperature detector technology, and in particular to an anti-interference temperature detector. Background Technology

[0002] A temperature sensor is a device that converts the physical quantity of temperature into a measurable electrical signal. Its core function is to sense the temperature changes of the environment or target object in real time and output corresponding electrical signals (such as changes in resistance, voltage, and current) for subsequent circuits or systems to perform signal processing, analysis, and control. It is widely used in fire detection, industrial temperature control, and heat dissipation monitoring of electronic equipment.

[0003] Existing temperature detectors mostly use a single-layer thin metal shell for shielding. This type of shielding has limited anti-interference capabilities and is insufficient to withstand the strong electromagnetic radiation generated by motors, frequency converters, and other equipment in industrial plants. This deficiency easily leads to signal distortion in the temperature acquisition probe, resulting in frequent false alarms. Most false alarms are directly caused by electromagnetic interference. More importantly, some detectors lack any shielding design at all. In high-temperature environments, these detectors lack the ability to distinguish electromagnetic interference, easily misidentifying it as an abnormal temperature signal, thus triggering unnecessary fire alarms. This not only disrupts normal production but also causes unnecessary economic losses. Utility Model Content

[0004] The purpose of this invention is to provide an anti-interference temperature sensor to address the problems mentioned above in the background technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an anti-interference temperature sensor, comprising a housing and connecting wires, wherein two mounting holes are provided on the bottom surface of the housing, a detection head assembly is electrically connected to the top surface of the housing, an input interface is fixedly installed on one side surface of the housing, and a shielding device is provided on the surface of the housing, the shielding device comprising a vertical rod fixedly installed on the top surface of the housing, a sliding plate is slidably connected to the outer wall surface of the vertical rod, and a shielding cover is fixedly installed on the side of the sliding plate.

[0006] Preferably, a circular mounting base is fixedly installed on the top surface of the housing, and an annular limiting groove is formed on the surface of the circular mounting base.

[0007] Preferably, a horizontal U-shaped frame is fixedly installed on the top surface of the housing, and a threaded rod is rotatably connected between the inner walls of the vertical ends on the left and right sides of the horizontal U-shaped frame. A rotating wheel is fixedly installed on the outer wall surface of the threaded rod, and the threads on the surface of the threaded rod are mutually opposite threads with the rotating wheel as the center.

[0008] Preferably, the inner wall surface of the horizontal end of the horizontal U-shaped frame is provided with a sliding groove, and the surface of the threaded rod is threadedly connected to two movable plates, which are slidably connected by the threaded rod and the sliding groove.

[0009] Preferably, a T-shaped plate is fixedly installed on the side surface of the shield away from the slide plate, and two hinge plates are hinged to the bottom surface of the T-shaped plate. The end of the hinge plate away from the T-shaped plate is hinged to the movable plate.

[0010] The aforementioned components achieve the following effects: by completely enclosing the detection head assembly with a shielding cover, and in conjunction with the sealing structure within the annular limiting groove, they effectively block strong electromagnetic radiation generated by equipment such as motors and frequency converters in the industrial environment, reduce the impact of electromagnetic interference on the temperature acquisition signal, avoid false alarms caused by signal distortion, ensure that the detector only responds to true temperature anomalies, and improve monitoring accuracy and reliability.

[0011] Preferably, a control panel, a data transmission port, and an alarm are fixedly installed on one side surface of the housing, and the surface of the control panel is provided with an on / off switch, a document display screen, and indicator lights.

[0012] Preferably, a connecting device is provided on one side surface of the housing, the connecting device including an internally threaded sleeve fixedly installed on one side surface of the housing, and a hollow externally threaded post is fixedly installed on the outer wall surface of the connecting wire by injection molding.

[0013] Preferably, the two ends of the connecting wire are respectively connected to an input head and an output head.

[0014] The aforementioned components achieve the following effects: through the threaded engagement of the internal threaded sleeve and the hollow external threaded column, the input head of the connecting wire can be firmly fixed on the input interface, preventing the wire from loosening or falling off due to industrial vibration or accidental pulling, preventing signal transmission interruption, and ensuring that temperature data can be continuously and stably transmitted to downstream equipment, such as temperature control systems and fire alarm control panels.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows: In this invention, by setting up a shielding device, the detection head assembly is completely enclosed by the shielding cover. Combined with the sealing structure in the annular limiting groove, it can effectively block the strong electromagnetic radiation generated by equipment such as motors and frequency converters in the industrial environment, reduce the impact of electromagnetic interference on the temperature acquisition signal, avoid false alarms caused by signal distortion, ensure that the detector only responds to real temperature anomalies, and improve the accuracy and reliability of monitoring. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This utility model Figure 1 Another structural diagram from a different angle; Figure 3 This utility model Figure 2 Another structural diagram from a different angle; Figure 4 This utility model Figure 3 A schematic diagram of the three-dimensional structure at point A in the middle.

[0017] Legend: 1. Housing; 2. Shielding device; 201. Upright pole; 202. Slide plate; 203. Shielding cover; 204. Circular mounting base; 205. Annular limiting groove; 206. U-shaped frame; 207. Threaded rod; 208. Rotary wheel; 209. Slide groove; 210. Movable plate; 211. Hinge plate; 212. T-shaped plate; 3. Connecting device; 31. Internal threaded sleeve; 32. Hollow external threaded column; 33. Input head; 34. Output head; 4. Mounting hole; 5. Control panel; 6. Data transmission port; 7. Alarm; 8. Connecting wire; 9. Detection head assembly; 10. Input interface. Detailed Implementation

[0018] Example 1, as Figure 1-4 As shown, an anti-interference temperature detector includes a housing 1 and connecting wires 8. Two mounting holes 4 are formed on the bottom surface of the housing 1. A detection head assembly 9 is electrically connected to the top surface of the housing 1. An input interface 10 is fixedly installed on one side surface of the housing 1. A control panel 5, a data transmission port 6, and an alarm 7 are also fixedly installed on one side surface of the housing 1. The control panel 5 consists of an on / off switch, a document display screen, and indicator lights. The housing 1 is made of flame-retardant ABS material, with a temperature resistance of -30~70℃, and its surface is coated with an anti-static coating with an impedance ≤10 ohms. 8 The device has a resistance of Ω, a weight of ≤300g, and a connecting wire 8 made of high-temperature resistant silicone wire with tin-plated copper conductor, insulation strength ≥500V, aging resistance life ≥5 years, and adjustable length of 1-3m. The detection head assembly 9 is a platinum resistance thermometer PT100 with a temperature range of -20~150℃, temperature accuracy ±0.5℃, response time ≤1s, and a surface covered with a polytetrafluoroethylene insulation layer for corrosion protection. The input interface 10 is an industrial standard DB9 interface with a contact resistance ≤0.01Ω. The temperature display screen on the control panel 5 has a resolution of 0.1℃, and status indicator lights (red / green / yellow) corresponding to alarm / normal / fault, respectively. The data transmission port 6 is an RS485 interface supporting Modbus protocol with a transmission distance ≤1000m. The alarm 7 is an audible and visual alarm with a volume ≥90dB and a light flashing frequency of 1Hz. The alarm trigger threshold can be preset via the control panel, such as exceeding the target temperature by 5℃. The connecting wire 8 has an electromagnetic shielding layer in the middle, which is a tin-plated copper mesh with a shielding effectiveness ≥50dB to prevent interference to the wire itself.

[0019] Reference Figure 3-4As shown in this embodiment: a shielding device 2 is provided on the surface of the housing 1. The shielding device 2 includes a vertical rod 201 fixedly installed on the top surface of the housing 1. A sliding plate 202 is slidably connected to the outer wall surface of the vertical rod 201. A shielding cover 203 is fixedly installed on the side of the sliding plate 202. A circular mounting base 204 is fixedly installed on the top surface of the housing 1. An annular limiting groove 205 is formed on the surface of the circular mounting base 204. A horizontal U-shaped frame 206 is fixedly installed on the top surface of the housing 1. A threaded rod 207 is rotatably connected between the inner walls of the vertical ends on the left and right sides of the horizontal U-shaped frame 206. A rotating wheel 208 is fixedly installed on the outer wall surface of the threaded rod 207. The threads on the surface of the threaded rod 207 are opposite threads centered on the rotating wheel 208. A sliding groove 209 is formed on the inner wall surface of the horizontal end of the horizontal U-shaped frame 206. Two movable plates 210 are threadedly connected to the surface of the threaded rod 207. With the help of the threaded rod 207 and the sliding groove 209, a T-shaped plate 212 is fixedly installed on the side surface of the shield 203 away from the sliding plate 202. Two hinge plates 211 are hinged to the bottom surface of the T-shaped plate 212. The end of the hinge plate 211 away from the T-shaped plate 212 is hinged to the movable plate 210. The shield 203 is a nickel-plated copper mesh with a shielding efficiency of 60dB, suitable for 10kHz-1GHz+, with an inner conductive silicone pad thickness of 2mm and a Shore hardness of 40±5A. It is sealed to prevent electromagnetic leakage, completely encloses the detection head assembly 9, and has no shielding dead corners. The coaxiality between the circular mounting base 204 and the shield 203 is ≤0.1mm. The limit groove 205 is lined with a conductive silicone strip, and the gap between it and the shield 203 is ≤0.05mm to ensure electromagnetic sealing. The threaded rod 207 is an M8 specification, made of 45# steel, with a galvanized surface and a thread precision of 6g. The bottom of the sliding groove 209 is lined with a polytetrafluoroethylene wear-resistant layer.

[0020] Reference Figure 1-2 As shown in this embodiment: a connecting device 3 is provided on one side surface of the housing 1. The connecting device 3 includes an internally threaded sleeve 31 fixedly installed on one side surface of the housing 1. A hollow externally threaded post 32 is fixedly installed on the outer wall surface of the connecting wire 8 by injection molding. The two ends of the connecting wire 8 are respectively connected to an input head 33 and an output head 34. The inner wall of the internally threaded sleeve 31 is covered with a EPDM sealing ring. The hollow externally threaded post 32 is made of PA66+glass fiber, with an M12×1.5 specification and a mating clearance of ≤0.1mm with the internally threaded sleeve 31. The input head 33 is a DB9 male head that is compatible with the input plug interface 10. The contact pins are gold-plated. The output head 34 is a terminal type connector that is compatible with industrial control equipment. The insulating shell has a temperature resistance of ≥100℃.

[0021] Working principle: When using this device, the operator first determines the temperature measurement target, such as the heat source of industrial equipment or a power distribution cabinet, and then rotates the wheel 208 clockwise. The wheel 208 drives the threaded rod 207 to rotate synchronously. Because the surface of the threaded rod 207 has reverse threads centered on the wheel 208, the left side rotates left and the right side rotates right. The two movable plates 210 will slide synchronously towards each other along the slide groove 209 of the horizontal U-shaped frame 206. The bottom of the slide groove 209 is lined with a polytetrafluoroethylene wear-resistant layer to reduce sliding wear. At the same time, when the movable plates 210 move, they pull the hinge plate 211 to retract. The hinge plate 211 drives the T-shaped plate 212 to move upward, which in turn causes the shielding cover 203 to slide upward along the upright 201 with the sliding plate 202 until... The shield 203 completely detaches from the annular limiting groove 205 of the circular mounting base 204, exposing the detection head assembly 9. Ensure the detection head is unobstructed. Then, using expansion bolts, the housing 1 is fixed to a preset position, such as the equipment side wall or wall bracket, through the two mounting holes 4 at the bottom of the housing 1. During fixing, ensure the distance between the detection head assembly 9 and the temperature measurement target remains 5-10mm to avoid temperature distortion due to excessive proximity or response delay due to excessive distance. Next, the rotating wheel 208 is rotated counterclockwise. The threaded rod 207 drives the two movable plates 210 to move synchronously away along the sliding groove 209. The hinge plate 211 unfolds and pushes the T-shaped plate 212 downwards. The shield 203 slides down the upright 201 along the sliding plate 202. When the bottom of the shield 203 is completely... The fully embedded annular limiting groove 205 is tightly fitted with the conductive silicone strip inside the groove. When the resistance increases and there is no obvious gap, stop rotating the wheel 208. After the shielding and sealing are completed and the shielding is fixed, first hold the connecting wire 8 and align the input head 33 with the input interface 10 of the housing 1, ensuring that the pins of the input head 33 are in good contact with the input interface 10 without looseness. Then, rotate the hollow external thread post 32 on the outer wall of the connecting wire 8 clockwise so that it engages with the internal thread sleeve 31 of the housing 1. After tightening until the resistance is uniform, continue to apply force until the threads are fully engaged to ensure that the EPDM sealing ring on the inner wall of the internal thread sleeve 31 is compressed, forming an IP65 waterproof seal to prevent short circuits in humid environments. Then, connect the other end of the connecting wire 8. The output head 34 of the terminal is connected to the back-end equipment, such as industrial temperature control system and fire control panel. When connecting, it is necessary to ensure that the terminal is firmly connected without any loose connection. If network monitoring is required, multiple detectors can be connected to the same control system through the RS485 protocol of the data transmission port 6 to achieve centralized monitoring. After the connecting wire 8 is connected, gently pull the connecting wire 8 to check whether it is loose or has displacement. If the connection is reliable, after the connecting wire 8 is connected correctly, enter the temperature target and temperature through the temperature display screen of the control panel 5 by pressing the operation key. For example, the normal operating temperature of industrial equipment is 30℃ and the cold storage temperature is -10℃. Then set the alarm threshold, which is usually 3-10℃ above the target temperature. For example, if the target temperature is 30℃, set it to 35℃. Press the confirmation key to save the parameters.Simultaneously activate the "automatic compensation" mode. When environmental electromagnetic interference increases, the detector assembly 9 will automatically enhance signal processing strength to reduce distortion caused by interference. Finally, press the self-test button on the control panel 5 again to confirm that the parameter settings are correct and the signal transmission of the detector assembly 9 is normal. The indicator light on the control panel 5 will turn solid green, and the detector will enter standby monitoring mode. During monitoring, the detector assembly 9 will collect the temperature signal of the environment or target object in real time with a response time of ≤1 second, and convert the physical quantity of temperature into an electrical signal and transmit it to the control panel 5. The temperature display screen will show the monitored value in real time for easy viewing by the operator. If the monitored temperature is within the target range, such as 30±5℃, the indicator light on the control panel 5 will remain solid green. The detector continuously and stably monitors the temperature. If the temperature rises to a preset alarm threshold, such as 35℃, the control panel 5 immediately triggers the alarm 7: a sound alarm with a volume ≥90dB and a 1Hz flashing red light are activated simultaneously. At the same time, an alarm signal, such as a fire alarm command or a temperature control system shutdown command, is sent to the backend system via the data transmission port 6 to remind personnel to handle the situation promptly. If the ambient electromagnetic interference intensity exceeds the detector's adaptability range, the indicator light on the control panel 5 flashes yellow without triggering an alarm, only serving as an interference warning. In this case, the nickel-plated copper mesh of the shielding cover 203 and the conductive sealing structure of the annular limiting groove 205 continue to function, reducing the impact of interference on the detection head assembly 9 and ensuring that the monitoring data deviation is ≤0.5℃.

[0022] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the scope of the utility model's technical solution, still fall within the protection scope of this utility model's technical solution. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.

Claims

1. An anti-interference type temperature sensor, comprising a housing (1) and connecting wires (8), wherein two mounting holes (4) are formed on the bottom surface of the housing (1), a detection head assembly (9) is electrically connected to the top surface of the housing (1), and an input interface (10) is fixedly mounted on one side surface of the housing (1), characterized in that: The surface of the housing (1) is provided with a shielding device (2). The shielding device (2) includes a pole (201) fixedly installed on the top surface of the housing (1). A sliding plate (202) is slidably connected to the outer wall surface of the pole (201). A shielding cover (203) is fixedly installed on the side of the sliding plate (202).

2. A tamper-resistant rate-of-rise temperature sensor according to claim 1, wherein: A circular mounting base (204) is fixedly installed on the top surface of the housing (1), and an annular limiting groove (205) is provided on the surface of the circular mounting base (204).

3. The anti-interference temperature sensing detector according to claim 1, characterized in that: A horizontal U-shaped frame (206) is fixedly installed on the top surface of the housing (1). A threaded rod (207) is rotatably connected between the inner walls of the vertical ends on the left and right sides of the horizontal U-shaped frame (206). A rotating wheel (208) is fixedly installed on the outer wall surface of the threaded rod (207). The threads on the surface of the threaded rod (207) are opposite to each other with the rotating wheel (208) as the center.

4. A tamper-resistant heat detector according to claim 3, wherein: The inner wall surface of the horizontal end of the horizontal U-shaped frame (206) is provided with a groove (209), and the surface of the threaded rod (207) is threadedly connected to two movable plates (210). The movable plates (210) are slidably connected by means of the threaded rod (207) and the groove (209).

5. The anti-tamper temperature sensing probe of claim 1, wherein: A T-shaped plate (212) is fixedly installed on the side surface of the shield (203) away from the slide plate (202). Two hinge plates (211) are hinged to the bottom surface of the T-shaped plate (212). The end of the hinge plate (211) away from the T-shaped plate (212) is hinged to the movable plate (210).

6. The anti-interference type temperature sensor according to claim 1, characterized in that: A control panel (5), a data transmission port (6), and an alarm (7) are fixedly installed on one side surface of the housing (1). The surface of the control panel (5) is provided with an on / off switch, a document display screen, and indicator lights.

7. The anti-tamper temperature sensor of claim 1, wherein: The housing (1) is provided with a connecting device (3) on one side surface. The connecting device (3) includes an internal threaded sleeve (31) fixedly installed on one side surface of the housing (1). The outer wall surface of the connecting wire (8) is fixedly installed with a hollow external threaded column (32) by injection molding.

8. The anti-tamper temperature sensor of claim 1, wherein: The two ends of the connecting wire (8) are respectively connected to an input head (33) and an output head (34).

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