Thermocouple wire fixing device

Abstract

The embodiment of the utility model provides a thermocouple wire fixing device. The thermocouple wire fixing device comprises a U-shaped adjustable included angle support, an insulation fixing assembly, a compensation wire, a stretching-in rod and an included angle adjusting assembly. The U-shaped adjustable-included-angle support is fixed to the top of the extending rod, and the adjustable-included-angle assembly is arranged on the U-shaped adjustable-included-angle support and used for adjusting the relative angle of the U-shaped adjustable-included-angle support; the insulating fixing assemblies are respectively fixed at the top ends of the two brackets of the U-shaped bracket with the adjustable included angle; the insulating fixing assemblies are used for fixing thermocouple wires for measuring temperature; one end of the compensation wire is wound on the insulation fixing assembly, the other end of the compensation wire extends in the support direction of the U-shaped adjustable included angle support and is inserted into the extending rod, and when the flame temperature is measured, the compensation wire is in contact with the thermocouple wire. Secondary contact between the thermocouple wire and metal is isolated through the insulation fixing assembly, the contact potential is reduced, and the space adaptability is enhanced through the U-shaped adjustable included angle support and the extending rod.

Description

Technical Field

[0001] This utility model relates to the field of flame temperature measurement technology, specifically to a device for fixing thermocouple wires. Background Technology

[0002] Accurate flame temperature measurement is crucial for optimizing combustion efficiency during combustion experiments. Temperature measurement precision and control are paramount, typically achieved using thermocouple wires. However, existing thermocouple clamps are too bulky and structurally complex. Furthermore, the metal clamps form secondary thermocouple junctions upon contact with K / N type thermocouple wires, generating contact potential interference. The complex flow patterns in the combustion field also preclude the use of existing fixed clamps.

[0003] In reality, flame temperature measurement has numerous applications, including industrial combustion systems such as gas turbine combustors, boiler burners, and aerospace propulsion systems; materials science experiments such as high-temperature alloy smelting and ceramic sintering temperature field monitoring; and environmental science applications such as transient temperature capture in the study of combustion pollutant formation mechanisms. These scenarios demand high accuracy in temperature measurement because precise flame temperature measurement is a core element in optimizing combustion efficiency, making the accuracy and control of temperature testing extremely important.

[0004] Currently, flame temperature measurement typically uses thermocouples as the sensing element, as seen in utility model patents such as the temperature measurement system for vacuum heat treatment equipment. Existing clamps are also used to fix armored thermocouples. While the outer metal protective tube of the armored thermocouple enhances mechanical strength, its thermal response speed is slow, making it difficult to meet the needs of transient high-temperature measurements. The combustion field has complex flow characteristics, and the flame shape dynamically changes with fuel type, flow velocity, and environmental conditions. Existing fixed clamps cannot adjust the clamping angle and insertion depth of the thermocouple according to experimental requirements, resulting in limited temperature measurement positions and difficulty in capturing the temperature distribution in the core flame region. For example, while the utility model patent "Multi-degree-of-freedom body deformation-adaptive double-needle thermocouple temperature measurement device" has some adjustment capabilities, its complex structure and large size make it difficult to apply in confined experimental spaces. The diameter and fixing method of the thermocouple wire limit its use. When traditional metal clamps come into contact with K-type / B-type thermocouple wires, a secondary thermocouple junction is formed, generating a parasitic potential of 0.1-2mV. In high-temperature environments, such parasitic potentials can lead to temperature measurement errors as high as ±150℃, severely impacting data reliability. The complex flow patterns in combustion fields mean that existing fixed clamps cannot meet the temperature measurement requirements at different angles and depths, exhibiting poor spatial adaptability. Therefore, there is an urgent need for a compact, high-temperature resistant, flexibly adjustable thermocouple wire clamp that can effectively suppress parasitic potentials to meet the high-precision temperature measurement requirements of complex combustion fields. Utility Model Content

[0005] In view of this, the embodiments of this specification provide a thermocouple wire fixing device to solve the defects of existing flame temperature measurement in terms of contact potential and insufficient spatial adaptability, and to provide a thermocouple wire clamp with adjustable angle and insertion depth.

[0006] The embodiments in this specification provide the following technical solutions:

[0007] A thermocouple wire fixing device, comprising:

[0008] U-shaped adjustable angle bracket, insulating fixing assembly, compensating wire, extension rod and adjusting angle assembly;

[0009] The U-shaped adjustable angle bracket is fixed to the top of the extension rod, and the angle adjustment component is set on the U-shaped adjustable angle bracket and is used to adjust the relative angle of the U-shaped adjustable angle bracket.

[0010] The insulating fixing components are respectively fixed to the top of the two brackets of the U-shaped adjustable angle bracket. The insulating fixing components are used to fix the thermocouple wire for measuring temperature.

[0011] One end of the compensating wire is wrapped around the insulating fixing component, and the other end of the compensating wire extends along the support direction of the U-shaped adjustable angle bracket and is inserted into the extension rod. When measuring the flame temperature, the compensating wire comes into contact with the thermocouple wire.

[0012] Furthermore, the insulating fixing assembly includes insulating fixing bolts and insulating fixing nuts;

[0013] One end of the compensating wire is wrapped around an insulating fixing bolt and secured with an insulating fixing nut.

[0014] Furthermore, both the insulating fixing bolts and the insulating fixing nuts include a ceramic layer.

[0015] Furthermore, the insulating fixing nut is a double-layer nut.

[0016] Furthermore, the compensating conductor includes a mica insulation layer wrapped around its outer periphery, which is disposed at the contact portion between the compensating conductor and the U-shaped adjustable angle bracket.

[0017] Furthermore, the compensating wire also includes a high-temperature resistant sealant layer wrapped around the outer periphery of the compensating wire, and the high-temperature resistant sealant layer is disposed on the part of the compensating wire inserted into the extension rod.

[0018] Furthermore, the angle adjustment assembly includes a spring traction structure and a movable bolt;

[0019] The spring traction structure is fixed to the outer periphery of the U-shaped adjustable angle bracket, and the movable bolt is located at the connection between the bracket and the extension rod of the U-shaped adjustable angle bracket.

[0020] Furthermore, the length of the extension rod can be adjusted within the range of 50mm to 250mm.

[0021] Furthermore, the relative angle ranges from 0 degrees to 60 degrees.

[0022] Furthermore, the inside of the extension rod is a hollow structure, through which the compensating wire passes.

[0023] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0024] The thermocouple wire fixing device of this utility model isolates the thermocouple wire from the metal through the insulating fixing component, thereby reducing the contact potential; the thermocouple wire fixing device with adjustable angle and insertion depth, in conjunction with the insulating fixing component, allows the diameter of the clamped thermocouple wire to be reduced to 0.1mm; the U-shaped adjustable angle bracket and insertion rod of the thermocouple wire fixing device with adjustable angle and insertion depth enhance spatial adaptability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front view of the thermocouple wire fixing device according to an embodiment of the present invention;

[0027] Figure 2 This is a partial enlarged view of the U-shaped adjustable angle bracket of the thermocouple wire fixing device according to an embodiment of the present invention;

[0028] Figure 3 This is a side view of the thermocouple wire fixing device according to an embodiment of the present invention.

[0029] The attached diagram is labeled as follows: 1. U-shaped adjustable angle bracket; 2. Insulating fixing component; 3. Compensating wire; 4. Extension rod; 5. Spring traction structure; 6. Movable bolt. Detailed Implementation

[0030] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] like Figures 1 to 3 As shown, a thermocouple wire fixing device includes:

[0033] 1. U-shaped adjustable angle bracket; 2. Insulating fixing component; 3. Compensating wire; 4. Extension rod; and 5. Adjustable angle component.

[0034] The U-shaped adjustable angle bracket 1 is fixed to the top of the extension rod 4, and the angle adjustment assembly is set on the U-shaped adjustable angle bracket 1. The insulating fixing assembly 2 is fixed to the top of the two brackets of the U-shaped adjustable angle bracket 1 respectively, and the insulating fixing assembly 2 is used to fix the thermocouple wire for measuring temperature. One end of the compensating wire 3 is wound around the insulating fixing assembly 2, and the other end of the compensating wire 3 extends along the bracket direction of the U-shaped adjustable angle bracket 1 and is inserted into the extension rod 4. When measuring the flame temperature, the compensating wire 3 contacts the thermocouple wire to effectively extend the thermocouple signal.

[0035] The insulating fixing assembly 2 includes insulating fixing bolts and insulating fixing nuts. Two pairs of insulating fixing nuts are embedded at both ends of the U-shaped adjustable angle bracket 1 to fix the thermocouple wire for measuring temperature.

[0036] One end of the compensating wire 3 is wound around an insulating fixing bolt and secured with an insulating fixing nut. Both the insulating fixing bolt and the insulating fixing nut include a ceramic layer. The insulating fixing nut is a double-layer nut, used to secure the thermocouple wire for measuring temperature.

[0037] The compensating conductor 3 includes a mica insulation layer wrapped around its outer periphery. The mica insulation layer is disposed at the contact portion between the compensating conductor 3 and the bracket of the U-shaped adjustable angle bracket 1, preventing the compensating conductor 3 from contacting the metal along the exposed portion of the bracket of the U-shaped adjustable angle bracket 1 and generating a contact potential.

[0038] The compensating conductor 3 also includes a high-temperature resistant sealant layer wrapped around its outer periphery. This high-temperature resistant sealant layer is located on the portion of the compensating conductor 3 that is inserted into the extension rod 4. The compensating conductor 3 extends into the extension rod 4 along with the support of the U-shaped adjustable angle bracket 1, and the portions that are likely to come into contact with metal are wrapped and filled with insulating material (mica insulation layer or high-temperature resistant sealant layer) to the end of the extension rod 4.

[0039] The adjustable angle assembly includes a spring traction structure 5 and a movable bolt 6. The spring traction structure 5 is fixed to the outer periphery of the bracket of the U-shaped adjustable angle bracket 1, and the movable bolt 6 is located at the connection between the bracket of the U-shaped adjustable angle bracket 1 and the extension rod 4. The adjustable angle assembly is pulled and stretched using the spring traction structure 5.

[0040] The length of the extension rod 4 is adjustable from 50mm to 250mm. The extension rod 4 has a hollow structure inside, through which the compensating wire 3 passes.

[0041] The relative angle of the two brackets of the U-shaped adjustable angle bracket 1 is adjustable, and the relative angle ranges from 0 degrees to 60 degrees.

[0042] In one embodiment of this utility model, when using a fixing device to clamp thermocouple wires to measure flame temperature, the following should be observed first: 1. Whether the compensating wire 3 is wrapped around the insulating fixing bolt of the insulating fixing component 2; 2. Whether the part of the compensating wire 3 extending along the U-shaped adjustable angle bracket 1 contacts the metal part; 3. Whether the sealant in the inserted rod 4 has fallen off; 4. Whether the movable bolt 6 can move smoothly and whether the U-shaped adjustable angle bracket 1 can be fixed when it moves to the specified angle.

[0043] After confirming that the exposed part of the compensation wire 3 is wrapped around the insulating fixing bolt, the movable bolt 6 should be rotated first to observe the tension change of the spring in the spring traction structure 5, and the included angle of the two arms of the U-shaped adjustable angle bracket 1 should be adjusted to the target angle.

[0044] Wrap the thermocouple wire (0.1mm in diameter) around the groove of the insulating fixing bolt of the insulating fixing assembly 2, and tighten the upper and lower insulating fixing nuts to ensure that the contact points are secure. Adjust the extension rod 4 to a suitable length and place it in the flame for temperature measurement. During the winding of the thermocouple wire, ensure that the compensating wire 3 is in contact with the thermocouple wire to extend the signal. Clean the carbon deposits on the surface of the fixing device after each experiment, and periodically calibrate the system error using a standard thermocouple.

[0045] This invention's thermocouple wire fixing device abandons the traditional armored thermocouple, directly using exposed thermocouple wire as the sensing element. This avoids the thermal inertia interference of the metal protective tube, shortening the thermal response time to 0.2 seconds and improving temperature measurement accuracy by more than 30%, making it particularly suitable for capturing transient flame temperatures. The ceramic insulating fixing nut and the insulating fixing nut, by blocking direct contact between the thermocouple wire and the metal bracket of the U-shaped adjustable angle bracket 1, reduce the parasitic potential generated by the secondary thermocouple junction to below 0.02mV, a 98% reduction compared to traditional metal clamps. The thermocouple wire fixing device also supports the fixing of ultra-fine thermocouple wires with diameters as low as 0.1mm. A progressive locking structure with double nuts (the insulating fixing nut is a double-nut design) ensures the stability of the thermocouple wire under high-temperature vibration environments. A modular combination design of the U-shaped adjustable angle bracket 1 and the extension rod 4 is adopted. The U-shaped adjustable angle bracket 1 achieves continuous angle adjustment from 0° to 60° via a spring traction structure 5, adapting to dynamic changes in flame shape. The length of the extension rod 4 can be locked in segments within the range of 50-250mm. Combined with the hollow structure design of the extension rod 4 (approximately 10mm in diameter), it can penetrate deep into the core area of ​​the flame while avoiding the impact of airflow disturbance on the thermocouple wire. The compensating wire 3 is easily accessible. The bracket portion of the U-shaped adjustable angle bracket 1 is wrapped with a mica insulation layer, and the portion of the compensating wire 3 located in the hollow structure of the extension rod 4 is wrapped with high-temperature resistant sealant. The compensating wire 3 is only exposed at the contact point with the thermocouple wire. Combined with the insulating sealing cap at the end of the extension rod 4, leakage current interference in the signal transmission path is completely eliminated. The spring adjustment structure not only controls the angle of the bracket but also fine-tunes the tension of the thermocouple wire, ensuring its straightness and reducing temperature measurement deviations caused by bending. The thermocouple wire fixing device has a simplified overall structure, with an integrated layout of adjustment knobs and locking buckles. Experimenters can complete the installation and parameter settings within 3 minutes without special tools, greatly improving experimental efficiency.

[0046] The U-shaped adjustable angle bracket 1 is made of 304 stainless steel. For higher temperature measurements, other high-temperature resistant materials can be used to meet specific needs. The U-shaped adjustable angle bracket 1 is U-shaped overall. Its two legs consist of upper and lower stainless steel plates. The compensating wire 3 is wrapped with a mica insulation layer on the outside where it contacts the legs to prevent increased contact potential and temperature measurement deviation caused by the wire 3 contacting the metal parts as it extends along the bracket. The insulating fixing bolts and nuts at both ends are made of ceramic for insulation and to reduce contact potential. The two ends of the U-shaped section are 90mm apart and 75mm high. One end is bolted to the bottom of the U-shape, and the other end is connected by a movable bolt 6 and a spring traction structure 5 to adjust the angle. The compensating wire 3 is wound around the insulating fixing bolt, contacts the subsequently wound thermocouple wire, and is clamped and fixed with two insulating nuts. The compensating wire effectively extends the thermocouple signal while maintaining temperature measurement accuracy. The compensating wire 3 extends into the insertion rod 4 along with the U-shaped adjustable angle bracket 1. The portion that easily contacts the metal is wrapped and filled with insulating material (high-temperature resistant sealant layer) to the end of the insertion rod 4 to further reduce the influence of contact potential. The insertion rod 4 is 250mm long and 10mm in diameter, and is hollow to facilitate the passage of the compensating wire 3. The angle bracket can be adjusted to change the angle, and the insertion rod can be adjusted to change the depth. Multi-directional coordination allows for more flexible spatial adaptability.

[0047] The embodiments of this utility model achieve the following technical effects:

[0048] The thermocouple wire fixing device of this utility model isolates the thermocouple wire from the metal through the insulating fixing bolts and insulating fixing nuts of the insulating fixing assembly, thereby reducing the contact potential. The thermocouple wire fixing device with adjustable angle and insertion depth, together with the insulating fixing nut and the double-nut structure insulating fixing nut, allows the diameter of the clamped thermocouple wire to be reduced to 0.1mm. The U-shaped adjustable angle bracket and insertion rod of the thermocouple wire fixing device with adjustable angle and insertion depth enhance spatial adaptability. All parts of the compensating wire that are easy to contact with the metal are wrapped with insulating material, further reducing the influence of contact potential.

[0049] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of its implementation. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this utility model patent should still fall within the scope of this patent. Furthermore, the technical features, technical features and technical solutions, and technical solutions in this utility model can be freely combined and used.

Claims

1. A fixing device for thermocouple wires, characterized in that include: U-shaped adjustable angle bracket (1), insulating fixing assembly (2), compensating wire (3), extension rod (4) and adjusting angle assembly; The U-shaped adjustable angle bracket (1) is fixed to the top of the extension rod (4), and the angle adjustment assembly is set on the U-shaped adjustable angle bracket (1) and is used to adjust the relative angle of the bracket of the U-shaped adjustable angle bracket (1); The insulating fixing component (2) is fixed to the top of the two brackets of the U-shaped adjustable angle bracket (1), and the insulating fixing component (2) is used to fix the thermocouple wire for measuring temperature. One end of the compensating wire (3) is wrapped around the insulating fixing assembly (2), and the other end of the compensating wire (3) extends along the support direction of the U-shaped adjustable angle bracket (1) and is inserted into the extension rod (4). When measuring the flame temperature, the compensating wire (3) comes into contact with the thermocouple wire.

2. The thermocouple wire fixing device according to claim 1, characterized in that, The insulating fixing assembly (2) includes an insulating fixing bolt and an insulating fixing nut; One end of the compensating wire (3) is wrapped around the insulating fixing bolt and fixed by the insulating fixing nut.

3. The fixing device of a thermocouple wire according to claim 2, characterized in that, Both the insulating fixing bolt and the insulating fixing nut include a ceramic layer.

4. The thermocouple wire securing device of claim 2, wherein, The insulating fixing nut is a double-layer nut.

5. The thermocouple wire securing device of claim 1, wherein, The compensating conductor (3) includes a mica insulation layer wrapped around the outer periphery of the compensating conductor (3), and the mica insulation layer is disposed at the contact portion of the compensating conductor (3) and the bracket of the U-shaped adjustable angle bracket (1).

6. The thermocouple wire securing device of claim 5, wherein, The compensating wire (3) also includes a high-temperature resistant sealant layer wrapped around the outer periphery of the compensating wire (3), and the high-temperature resistant sealant layer is disposed on the portion of the compensating wire (3) inserted into the extension rod (4).

7. The thermocouple wire fixing device according to claim 1, characterized in that, The angle adjustment assembly includes a spring traction structure (5) and a movable bolt (6); The spring traction structure (5) is fixed to the outer periphery of the bracket of the U-shaped adjustable angle bracket (1), and the movable bolt (6) is set at the connection between the bracket of the U-shaped adjustable angle bracket (1) and the extension rod (4).

8. The thermocouple wire securing device of claim 1, wherein, The length of the extension rod (4) can be adjusted from 50 mm to 250 mm.

9. The thermocouple wire securing device of claim 1, wherein, The relative angle ranges from 0 degrees to 60 degrees.

10. The thermocouple wire securing device of claim 1, wherein, The interior of the extension rod (4) is a hollow structure, and the compensation wire (3) passes through the extension rod (4) through the hollow structure.

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