Temperature transmitter with anti-interference function

Abstract

The utility model discloses a temperature transmitter with anti -interference function has, including upper casing and lower casing, its characterized in that: the upper casing includes integrated casing and the upper adjusting cylinder of integral connection in integrated casing bottom, the integrated casing cavity is provided with circuit board, the lower casing includes the lower adjusting cylinder, sealing nut, threaded connection pipe and the protection tube of integral connection from top to bottom in proper order, the protection tube inner bottom is provided with thermal resistance, and this thermal resistance is through wire and circuit board electricity is connected, the lower adjusting cylinder is connected through adjusting the upper adjusting cylinder of rotating drum, and manual rotation adjusting rotating drum can drive the distance between lower adjusting cylinder and upper adjusting cylinder, the utility model discloses adjusting rotating drum structure of adjustable distance makes user can according to the actual situation on the spot, and the relative distance between upper casing (contains circuit board in) and lower casing (contains thermal resistance in) is flexibly adjusted, and the heat that flexibly controls conduction to circuit board, reduces the interference.

Description

Technical Field

[0001] This utility model relates to the field of industrial automation instrumentation technology, specifically a temperature transmitter with anti-interference function. Background Technology

[0002] Temperature transmitters are key instruments widely used in industrial process control systems. They are typically installed in the field, such as... Figure 5 This is an application illustration of an existing model of temperature transmitter. The structure of this model of temperature transmitter is different from that of this utility model, but the purpose is the same. Both are used to detect the temperature of the medium (liquid or gas) and convert the temperature signal into a standard signal (such as a 4-20mA current signal or a digital signal) for on-site display or remote transmission to the control room.

[0003] In many industrial settings, such as petrochemical, power, and metallurgical industries, the measurement environment is often complex, characterized by high temperatures and strong electromagnetic interference. Existing temperature transmitters typically have their core signal processing circuit board and the temperature sensing element (such as a resistance temperature detector) mounted in a relatively fixed position. When the temperature of the detected medium is high, heat is easily conducted through the metal casing to the cavity containing the circuit board, causing the circuit board to operate at a high ambient temperature. This can not only affect the performance and lifespan of electronic components, but more seriously, high temperatures exacerbate thermal noise in the circuit, reduce the signal-to-noise ratio, and make even weak temperature measurement signals more susceptible to interference, affecting the accuracy and stability of the measurement. Furthermore, limitations in on-site installation space and wiring length also cause inconvenience for the installation, commissioning, and maintenance of the transmitter.

[0004] Therefore, a temperature transmitter that can effectively reduce heat source interference to the circuit board and has good installation adaptability is needed. Utility Model Content

[0005] The purpose of this invention is to provide a temperature transmitter with anti-interference function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A temperature transmitter with anti-interference function includes an upper housing and a lower housing, characterized in that: the upper housing includes an integrated housing and an upper adjusting cylinder integrally connected to the bottom of the integrated housing, and a circuit board is disposed in the cavity of the integrated housing; the lower housing includes a lower adjusting cylinder, a sealing nut, a threaded connecting pipe and a protective pipe integrally connected from top to bottom, and a thermal resistor is disposed at the bottom of the protective pipe, which is electrically connected to the circuit board through a wire; the lower adjusting cylinder is connected to the upper adjusting cylinder through an adjusting rotary cylinder, and the distance between the lower adjusting cylinder and the upper adjusting cylinder can be driven by manually rotating the adjusting rotary cylinder.

[0008] Furthermore, the adjusting cylinder includes an operating ring, an upper threaded cylinder integrally formed at the top of the operating ring, and a lower threaded cylinder integrally formed at the bottom of the operating ring. The upper threaded cylinder is threadedly connected to the upper adjusting cylinder, and the lower threaded cylinder is threadedly connected to the lower adjusting cylinder. At least two pairs of corresponding guide holes are formed on the bottom surface of the upper adjusting cylinder and the top surface of the lower adjusting cylinder, respectively. The corresponding guide holes are slidably connected by guide rods to achieve guidance.

[0009] Furthermore, the section of the wire connecting the electrical connection thermal resistor and the circuit board located between the upper and lower adjusting cylinders is a spring cable, which is used to accommodate the distance adjustment between the lower and upper adjusting cylinders.

[0010] Furthermore, a first heat insulation body is provided on the bottom surface of the lower regulating cylinder, and the first heat insulation body clamps a portion of the wire that passes through it.

[0011] Furthermore, a second heat insulation body is provided on the top surface of the upper adjusting cylinder, and the second heat insulation body clamps a section of the wire that passes through it.

[0012] Furthermore, an aviation plug is fixedly installed on the top of the integrated housing, and the aviation plug is electrically connected to the circuit board.

[0013] Furthermore, friction textures are formed on the outer surface of the operating ring to increase the operating friction force when rotating the operating ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, through the design of an adjustable rotating drum structure, allows users to flexibly adjust the relative distance between the upper housing (containing the circuit board) and the lower housing (containing the thermal resistor) according to actual site conditions. When the ambient temperature at the temperature measurement point is high, rotating the adjusting drum can pull the circuit board away from the high-temperature area, effectively increasing the physical distance and heat dissipation path between the heat source and the sensitive electronic components, significantly reducing the heat conducted to the circuit board. This design fundamentally reduces the adverse effects of high temperatures on the circuit board's operation, reduces increased circuit noise and performance drift caused by temperature rise, thereby greatly improving the temperature transmitter's resistance to thermal interference and its long-term measurement stability and accuracy.

[0016] 2. The adjustment structure of this utility model not only serves the purpose of anti-interference but also brings convenience in installation. The application of spring cables ensures reliable connection and adaptability of the conductors during distance adjustment, avoiding pulling or damage to the lines. The cooperation between the guide rod and the guide hole ensures smoothness and alignment during the adjustment process, preventing misalignment that may occur with threaded connections. At the same time, the heat insulation body further blocks heat conduction along the conductors, forming multiple layers of thermal insulation protection. Attached Figure Description

[0017] Figure 1 This is a partial sectional view of the front of this utility model;

[0018] Figure 2 for Figure 1 A magnified view of part A in the image;

[0019] Figure 3 for Figure 1 A magnified view of part B in the image;

[0020] Figure 4 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 5 This is a schematic diagram showing the installation and connection of an existing model of temperature transmitter.

[0022] In the diagram: 1-Upper housing; 11-Integrated housing; 12-Upper adjusting cylinder; 13-Aviation plug; 2-Lower housing; 21-Lower adjusting cylinder; 22-Sealing nut; 23-Threaded connecting pipe; 24-Protective pipe; 3-Adjusting rotating cylinder; 31-Operating rotating ring; 32-Upper threaded cylinder; 33-Lower threaded cylinder; 4-Guide hole; 5-Guide rod; 6-Spring cable; 7-First heat insulation body; 8-Second heat insulation body; 9-Thermal resistance; 10-Wire. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 4 As shown, the present invention provides a temperature transmitter with anti-interference function, mainly comprising an upper housing 1, a lower housing 2, and an adjusting cylinder 3 connecting the two. The upper housing 1 further includes an integrated housing 11 and an upper adjusting cylinder 12 integrally connected to the bottom of the integrated housing 11. Specifically, the integrated housing 11 is typically made of metal and has a sealed cavity inside, in which a core circuit board (not shown separately) is installed to perform temperature signal conversion, amplification, and transmission functions. Preferably, an aviation connector 13 is fixedly installed on the top of the integrated housing 11. This aviation connector 13 is electrically connected to the internal circuit board for external power input and standard signal output. This connection method has the advantages of reliable connection and high protection level.

[0025] The lower housing 2 includes, from top to bottom, an integrally connected lower adjusting cylinder 21, a sealing nut 22, a threaded connecting pipe 23, and a protective pipe 24. The protective pipe 24 is typically inserted into the measured medium, and a temperature-sensitive element, such as a resistance temperature detector (RTD) 9, is installed at its bottom. This RTD 9 is electrically connected to a circuit board inside the upper housing 1 via a wire 10. The threaded connecting pipe 23 is used to install the entire transmitter onto a process connection mount on equipment or pipeline, while the sealing nut 22 ensures a tight seal at the installation point.

[0026] More specifically, the lower adjusting cylinder 21 is connected to the upper adjusting cylinder 12 of the upper housing 1 via an independent adjusting rotating cylinder 3. Manually rotating the adjusting rotating cylinder 3 can drive a relative axial displacement between the lower adjusting cylinder 21 and the upper adjusting cylinder 12, thereby changing the distance between them. This allows the upper housing 1, which contains the circuit board, to flexibly move away from or closer to the lower housing 2, which contains the thermal resistor 9, according to the ambient temperature, providing a structural basis for achieving thermal interference resistance.

[0027] Further optimized, the specific structure of the adjusting cylinder 3 includes an operating ring 31 for easy manual operation, an upper threaded cylinder 32 integrally formed at the top of the operating ring 31, and a lower threaded cylinder 33 integrally formed at the bottom of the operating ring 31. The upper threaded cylinder 32 is threadedly connected to the inner wall of the upper adjusting cylinder 12, while the lower threaded cylinder 33 is threadedly connected to the inner wall of the lower adjusting cylinder 21. It should be noted that the threads at both ends of the adjusting cylinder 3 rotate in opposite directions. When the operating ring 31 is rotated, since the upper and lower housings are usually restricted from circumferential rotation (through a subsequent guide mechanism), the rotational motion of the adjusting cylinder 3 itself is converted into axial relative movement between the upper adjusting cylinder 12 and the lower adjusting cylinder 21, thereby achieving distance adjustment. For ease of operation, preferably, friction textures, such as knurling or anti-slip grooves, are machined or cast on the outer surface of the operating ring 31 to increase the friction of the hand during operation and prevent slippage.

[0028] To ensure the smoothness of the adjustment process and prevent relative rotation of the components during adjustment, which could affect the lifespan of the threaded pair or the safety of the wire 10, this invention incorporates a guiding mechanism. Specifically, at least two pairs of corresponding guide holes 4 are formed on the bottom surface of the upper adjusting cylinder 12 and the top surface of the lower adjusting cylinder 21, respectively. The corresponding guide holes 4 are slidably connected by inserting guide rods 5. During the adjustment process, these guide rods 5 always slide within the guide holes 4 of the upper and lower adjusting cylinders, effectively limiting the circumferential rotation between the upper housing 1 and the lower housing 2, ensuring that the adjustment action is performed only axially, and providing excellent guidance and anti-rotation functions.

[0029] Considering the adjustable distance between the upper and lower housings, the wire 10 connecting the thermal resistor 9 and the circuit board needs to be able to adapt to this length change. A preferred embodiment of this invention is that the section of the wire 10 connecting the thermal resistor 9 and the circuit board located between the upper adjusting cylinder 12 and the lower adjusting cylinder 21 is made of a flexible spring cable 6 (e.g., Figure 1 (As shown). The spring cable 6 has good elasticity and can stretch or compress accordingly as the distance between the upper and lower shells is lengthened or shortened, ensuring the reliability of the electrical connection at all times, and preventing fatigue breakage of the conductor 10 due to repeated adjustments or long-term tension.

[0030] To further enhance the anti-thermal interference effect, this invention also introduces heat insulation measures. Specifically, a first heat insulation body 7 is provided on the inner bottom surface of the lower regulating cylinder 21. This first heat insulation body 7 can be made of high-temperature resistant ceramic, polytetrafluoroethylene, or other high-performance engineering plastics, and it clamps a portion of the connecting wire 10 that passes through it. Its function is to block or reduce the heat conducted up from the high-temperature protective tube 24 through the metal lower regulating cylinder 21, and also to reduce the upward conduction of heat along the wire 10 itself. Preferably, a second heat insulation body 8 can also be provided on the inner top surface of the upper regulating cylinder 12. Similarly, the second heat insulation body 8 also clamps a portion of the connecting wire 10 that passes through it. The first heat insulation body 7 and the second heat insulation body 8 work together to form two thermal barriers along the path of the wire 10, further isolating the heat source from the influence on the upper circuit board.

[0031] The installation and operation process of this utility model is roughly as follows: First, the lower housing 2 is installed into the measuring medium of the pipeline through the threaded connecting pipe 23. The distance that the circuit board (upper housing) needs to maintain is determined based on the ambient temperature near the measuring medium. If the ambient temperature is high, the operating ring 31 is manually rotated to rotate the adjusting cylinder 3. Due to the constraint of the guide rod 5, the upper adjusting cylinder 12 and the lower adjusting cylinder 21 move away from each other, thereby adjusting the upper housing 1 and its internal circuit board to a position farther from the heat source (i.e., the heating measuring medium) and at a lower temperature. During this process, the spring cable 6 extends adaptively. After adjustment, the heat conduction path becomes longer and is blocked by the first heat insulation body 7 and the second heat insulation body 8, significantly reducing the ambient temperature reaching the circuit board. The circuit board operates at a more suitable temperature, its anti-interference ability (especially anti-thermal interference) is enhanced, and the output temperature signal is more accurate and stable. The aviation plug 13 is used to connect the signal output line. When maintenance or replacement is required, the distance can be shortened by reversing the adjusting cylinder 3, facilitating disassembly.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temperature transmitter with anti-interference function, comprising an upper housing (1) and a lower housing (2), characterized in that: The upper housing (1) includes an integrated housing (11) and an upper adjusting cylinder (12) integrally connected to the bottom of the integrated housing (11). A circuit board is provided in the cavity of the integrated housing (11). The lower housing (2) includes a lower adjusting cylinder (21), a sealing nut (22), a threaded connecting pipe (23), and a protective pipe (24) integrally connected from top to bottom. A thermal resistor (9) is provided at the bottom of the protective pipe (24). The thermal resistor (9) is electrically connected to the circuit board through a wire (10). The lower adjusting cylinder (21) is connected to the upper adjusting cylinder (12) through an adjusting rotating cylinder (3). Manually rotating the adjusting rotating cylinder (3) can drive the distance between the lower adjusting cylinder (21) and the upper adjusting cylinder (12).

2. The temperature transmitter according to claim 1, characterized in that: The adjusting cylinder (3) includes an operating ring (31), an upper threaded cylinder (32) integrally formed on the top of the operating ring (31), and a lower threaded cylinder (33) integrally formed on the bottom of the operating ring (31). The upper threaded cylinder (32) is threadedly connected to the upper adjusting cylinder (12), and the lower threaded cylinder (33) is threadedly connected to the lower adjusting cylinder (21). At least two pairs of corresponding guide holes (4) are formed on the bottom surface of the upper adjusting cylinder (12) and the top surface of the lower adjusting cylinder (21), respectively. The corresponding guide holes (4) are slidably connected to each other by guide rods (5) to achieve guidance.

3. The temperature transmitter according to claim 1, characterized in that: The section of the wire (10) connecting the electrical connection thermal resistor (9) and the circuit board between the upper adjusting cylinder (12) and the lower adjusting cylinder (21) is made of spring cable (6), which is used to accommodate the distance adjustment between the lower adjusting cylinder (21) and the upper adjusting cylinder (12).

4. The temperature transmitter according to claim 1, characterized in that: The bottom surface of the lower regulating cylinder (21) is provided with a first heat insulation body (7), and the first heat insulation body (7) clamps a section of the wire (10) that passes through it.

5. The temperature transmitter according to claim 4, characterized in that: The upper adjusting cylinder (12) is provided with a second heat insulation body (8) on its inner top surface, and the second heat insulation body (8) clamps and connects a section of the wire (10) that passes through it.

6. The temperature transmitter according to claim 1, characterized in that: An aviation plug (13) is fixedly installed on the top of the integrated housing (11), and the aviation plug (13) is electrically connected to the circuit board.

7. The temperature transmitter according to claim 2, characterized in that: Friction patterns are formed on the outer surface of the operating ring (31) to increase the operating friction force when rotating the operating ring (31).

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