Thermocouple protection structure

Abstract

The invention relates to the technical field of thermocouple protection, in particular to a thermocouple protection structure which comprises a thermocouple body, a protection pipe is installed on the outer side of the thermocouple body, the end, extending into a dust removal pipeline, of the protection pipe is provided with an arc-shaped notch, and a medium in the dust removal pipeline scours the protection pipe when flowing downwards. The thermode slowly flows along the notch and is in contact with the thermocouple body; the protection pipe outside the dust removal pipeline is communicated with a gas inlet pipe, a valve is installed on the gas inlet pipe, nitrogen is introduced from the gas inlet pipe, the gap between the thermocouple body and the protection pipe is filled with the nitrogen, and a flow limiting mechanism is installed in the gas inlet pipe. According to the invention, the protection tube and the gap are arranged, a high-temperature smoke dust medium flowing downwards directly scours the protection tube without damaging the thermocouple in the protection tube, the medium can be diffused to the end part of the thermocouple through the gap, normal detection of the thermocouple is ensured, the fault probability of the thermocouple can be reduced, and the service life of the thermocouple is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of thermocouple protection, in particular to a thermocouple protection structure. Background Art

[0002] The temperature of smoke in the high-temperature dust removal pipeline of the electric arc furnace is high. The long-term direct flushing of the thermocouple by the high-temperature smoke medium will cause thermocouple wear and coking. Severe coking will cause the thermocouple to bend and deform, resulting in temperature measurement circuit failure, making it impossible to adjust the working conditions according to the temperature of the dust removal pipeline, and eventually causing the dust bag to burn out, causing safety accidents. The damaged thermocouple must be replaced, but the removal process is very difficult. Due to the coking and deformation of the thermocouple, the thermocouple cannot be pulled out from the outside of the dust removal pipeline. There are many safety risks in the handling process. The damaged thermocouple can only be removed by cutting and then replaced with a new thermocouple. This method does not fundamentally solve the actual problem, and there is still the problem of difficulty in disassembly and assembly when the failure occurs again. Based on this, a thermocouple protection structure is proposed. Summary of the invention

[0003] To address the deficiencies of the prior art, the present invention provides a thermocouple protection structure, which ensures normal detection of the thermocouple through a protection tube and a notch. This arrangement can reduce the probability of failure of the thermocouple and extend its service life.

[0004] To achieve the above object, the present invention provides the following technical solutions: a thermocouple protection structure, comprising a thermocouple body, a protection tube is installed on the outside of the thermocouple body, the end of the protection tube extending into the dust removal pipe is set to an arc-shaped notch, the medium in the dust removal pipe flushes the protection tube when flowing down, flows slowly along the notch and contacts the thermoelectrode of the thermocouple body, so as to reduce direct flushing of the thermocouple body;

[0005] The protective tube outside the dust removal pipeline is connected to an air inlet pipe, on which a valve is installed. Nitrogen is introduced from the air inlet pipe to fill the gap between the thermocouple body and the protective tube to block the medium from flowing into the gap, and a flow limiting mechanism is installed inside the air inlet pipe to balance the nitrogen backflush flow.

[0006] Preferably, the flow limiting mechanism comprises a flow limiting plate fixed in the air intake pipe, the flow limiting plate is provided with a plurality of flow limiting holes, and the flow limiting plate is provided with a plurality of connecting rods fixedly penetrated along the circumference thereof, an upper connecting plate is slidably mounted on the top of the connecting rods, the upper connecting plate is provided with a plurality of strip holes at intervals, and a flow limiting block cooperating with the flow limiting holes is fixed to the bottom of the upper connecting plate;

[0007] The upper connecting plate is provided with an adjusting member for limiting the depth of the flow limiting block extending into the flow limiting hole; and a one-way sealing member that only allows nitrogen to flow is provided at the bottom of the flow limiting plate.

[0008] Preferably, the adjusting member includes a blind opening formed on the edge of the upper connecting plate, the blind opening corresponds to the connecting rod one by one, and a locking screw for locking the upper connecting plate and the connecting rod is installed in the blind opening.

[0009] Preferably, the adjusting member comprises a screw rod threadedly connected to the center of the upper connecting plate, a knob is fixed to the top of the screw rod, and the bottom of the screw rod is rotatably mounted with the limiting plate.

[0010] Preferably, the one-way seal includes a lower connecting plate fixed to the bottom of the connecting rod, a plurality of groups of rectangular holes are provided on the lower connecting plate at intervals, and a telescopic rod is fixed at the position of the flow limiting hole at the top of the lower connecting plate, a sealing plate is fixed on the top of the telescopic rod, and a spring is sleeved on the telescopic rod to tighten the sealing plate to the position of the flow limiting hole.

[0011] Preferably, the one-way seal includes an annular body fixed to the bottom of the flow limiting plate, the annular body is distributed at the outer side of the flow limiting hole, and a plurality of groups of spring pieces are fixed in the annular body. When there is no nitrogen flow, the plurality of groups of spring pieces are in the same plane to achieve sealing. When there is nitrogen flow, the plurality of groups of spring pieces tilt downward to release the seal. A baffle rod is fixed in the annular body above the corresponding spring piece to prevent the spring piece from tilting upward.

[0012] Preferably, the top end size of the current limiting block is larger than the bottom end size thereof.

[0013] The present invention provides a thermocouple protection structure, which has the following beneficial effects compared with the prior art:

[0014] 1. A protection tube and a notch are provided. The downward-flowing high-temperature smoke medium directly washes on the protection tube without causing damage to the thermocouple inside it. Moreover, the medium can diffuse to the end position of the thermocouple through the notch, thus ensuring the normal detection of the thermocouple. This setting can reduce the probability of failure of the thermocouple and extend its service life.

[0015] 2. A nitrogen recoil structure is set up, and nitrogen is introduced from the air inlet pipe to fill the gap between the thermocouple body and the protection tube, preventing a large amount of high-temperature smoke and dust medium from entering the gap between the protection tube and the thermocouple and causing coking and blockage. It will also be easier to disassemble and assemble.

[0016] 3. A current limiting mechanism is set up. Since too much back-blowing nitrogen will cause the temperature measurement to be low and produce errors, the current limiting mechanism limits the intake volume of back-blowing nitrogen so that it does not affect the measurement accuracy of the thermocouple body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 It is a schematic diagram of thermocouple installation in the prior art;

[0019] Figure 2 This is a schematic diagram of the thermocouple installation protection structure in the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the current limiting mechanism in Example 1 of the present invention;

[0021] Figure 4 This is a structural exploded view of the current limiting mechanism in Example 1 of the present invention;

[0022] Figure 5 This is a structural exploded view of the current limiting mechanism in Embodiment 1 of the present invention from another perspective;

[0023] Figure 6 This is a schematic diagram of the structure of the current limiting mechanism in Example 2 of the present invention;

[0024] Figure 7 This is a schematic diagram of the structure of the adjusting member in Example 2 of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of the current limiting mechanism in Example 3 of the present invention;

[0026] Fig. 9 This is a bottom view of the current limiting mechanism structure in Example 3 of the present invention;

[0027] Fig.10 This is a schematic diagram of the structure of the mixed one-way seal in Example 3 of the present invention;

[0028] Fig.11 This is a schematic diagram of the structure of the current limiting mechanism in Example 4 of the present invention;

[0029] Fig.12 This is a bottom view of the current limiting mechanism structure in Example 4 of the present invention;

[0030] In the figure: 1-thermocouple body, 2-protection tube, 3-notch, 4-inlet pipe, 5-valve, a-current limiting mechanism, 6-current limiting plate, 7-current limiting hole, 8-connecting rod, 9-upper connecting plate, 10-strip hole, 11-current limiting block, 12-one-way sealing member, 13-adjusting member;

[0031] 1211-lower connecting plate, 1212-rectangular hole, 1213-telescopic rod, 1214-spring, 1215-sealing plate; 1311-blind opening, 1312-locking screw; 1221-annular body, 1222-spring, 1223-blocking rod; 1321-knob, 1322-screw. DETAILED DESCRIPTION

[0032] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0033] Example 1

[0034] The smoke temperature in the high-temperature dust removal pipeline of the arc furnace is high. The long-term erosion of the thermocouple by the high-temperature smoke medium will cause the thermocouple to wear and coke. This embodiment proposes a thermocouple protection structure, such as Figure 2-Figure 5 As shown, it includes a thermocouple body 1, and a protective tube 2 is installed on the outside of the thermocouple body 1. The protective tube 2 is made of 632 stainless steel, has the characteristics of high temperature resistance, corrosion resistance, and wear resistance, and its length slightly exceeds the insertion length of the thermocouple body 1, and the inserted part of the thermocouple body 1 is hidden in the protective tube 2. The protective tube 2 runs through the dust removal pipeline, and the end of the protective tube 2 extending into the dust removal pipeline is set as an arc-shaped notch 3, which can ensure that the medium flowing downward flows along the direction of the notch 3. On the one hand, it can reduce the flow rate and flow of the medium, and avoid a large amount of medium directly causing high-speed scouring of the thermocouple body 1. On the other hand, it can also allow the thermocouple body 1 Thermocouple electrodes can contact the downstream medium. The medium in the dust removal pipeline scours the protective tube 2 when flowing downstream, flows slowly along the notch 3 and contacts the thermocouple body 1 Thermocouple electrodes, so as to reduce direct scouring of the thermocouple body 1. The provision of the protection tube 2 and the notch 3 thereon not only does not hinder the normal operation of the thermocouple body 1 but also provides a good protection therefor, thereby reducing the probability of failure of the thermocouple body 1 and extending its service life.

[0035] The protection tube 2 outside the dust removal pipeline is connected to the air inlet pipe 4, and a valve 5 is installed on the air inlet pipe 4. Nitrogen is introduced from the air inlet pipe 4 to fill the gap between the thermocouple body 1 and the protection tube 2 to block the medium from flowing to the gap, thereby preventing a large amount of high-temperature smoke medium from entering between the protection tube 2 and the thermocouple and causing coking. A flow limiting mechanism a for balancing the nitrogen backflush flow rate is installed inside the air inlet pipe 4. Too much backflush nitrogen will cause low temperature measurement and produce errors. The flow limiting mechanism a limits the air intake of the backflush nitrogen so that it does not affect the measurement accuracy of the thermocouple body 1.

[0036] The above-mentioned flow limiting mechanism a includes a flow limiting plate 6 fixed in the intake pipe 4, and a plurality of groups of flow limiting holes 7 are opened on the flow limiting plate 6, and a plurality of groups of connecting rods 8 are fixedly penetrated through the flow limiting plate 6 along its circumferential direction, and an upper connecting plate 9 is slidably installed on the top of the connecting rod 8, and a plurality of groups of strip holes 10 are spaced apart on the upper connecting plate 9 to ensure that nitrogen passes through the upper connecting plate 9 normally, and a flow limiting block 11 cooperating with the flow limiting hole 7 is fixed at the bottom of the upper connecting plate 9, and the top size of the flow limiting block 11 is larger than the bottom size thereof, and the bottom size thereof is smaller than the size of the flow limiting hole 7, but the top size thereof is larger than the size of the flow limiting hole 7. An adjusting member 13 is provided on the upper connecting plate 9 to limit the depth of the flow limiting block 11 extending into the flow limiting hole 7. The degree of opening of the flow limiting hole 11 can be adjusted according to the depth of the flow limiting block 11, so that the amount of nitrogen passing through can be better adjusted, and the staff can adjust the filling flow of nitrogen according to the flow rate of the medium to ensure the accuracy of the detection; a one-way sealing member 12 that only allows nitrogen to flow through is provided at the bottom of the flow limiting plate 6 to prevent the medium from reversely passing through the flow limiting mechanism a and entering the air inlet 4, causing corrosion or damage to the valve 5 or the pipeline.

[0037] The adjustment member 13 used includes a blind hole 1311 opened on the edge of the upper connecting plate 9, the blind hole 1311 corresponds to the connecting rod 8 one by one, and a locking screw 1312 is installed in the blind hole 1311 to lock the upper connecting plate 9 with the connecting rod 8. By turning the locking screw 1312, the movement of the upper connecting plate 9 can be adjusted. For example, to reduce the flow rate of nitrogen, the upper connecting plate 9 is moved downward, and the flow-limiting block 11 on it is driven to move downward, so that the flow-limiting block 11 can be deeply inserted into the flow-limiting hole 7, which can reduce the flow rate of nitrogen. The staff can adjust the depth of the flow-limiting block 11 according to actual needs.

[0038] The one-way seal 12 used includes a lower connecting plate 1211 fixed to the bottom of the connecting rod 8, and a plurality of groups of rectangular holes 1212 are spaced apart on the lower connecting plate 1211. The setting of the rectangular holes 1212 can ensure that nitrogen can pass through the lower connecting plate 1211 smoothly, and a telescopic rod 1213 is fixed to the position of the limiting hole 7 at the top of the lower connecting plate 1211, and a sealing plate 1215 is fixed to the top of the telescopic rod 1213, and a spring 1214 is sleeved on the telescopic rod 1213, and the spring 1214 is fixed between the lower connecting plate 1211 and the sealing plate 1215, so as to press the sealing plate 1215 tightly against the position of the limiting hole 7. In the initial state, the sealing plate 1215 is tightly pressed against the flow limiting hole 7. Even if nitrogen is not introduced, the medium will not pass through the flow limiting plate 6, thereby ensuring the safety of the pipeline and the valve 5. When nitrogen is introduced, the nitrogen pressure will push the sealing plate 1215 downward to release the blockage of the flow limiting hole 7, and the nitrogen can pass through the flow limiting hole 7 smoothly.

[0039] Example 2

[0040] The same as Example 1, reference Figure 6-Figure 7, the difference is:

[0041] The adjusting member 13 used includes a screw rod 1322 threadedly connected to the center of the upper connecting plate 9, a knob 1321 is fixed to the top of the screw rod 1322, and the bottom of the screw rod 1322 is rotatably mounted with the flow limiting plate 6. Taking the reduction of the nitrogen flow rate as an example, the screw rod 133 is rotated by the knob 1321 to move the upper connecting plate 9 downward, driving the flow limiting block 11 thereon to move downward, so that the flow limiting block 11 can be deeply inserted into the flow limiting hole 7 to reduce the flow of nitrogen. The staff can adjust the depth of the flow limiting block 11 according to actual needs. Compared with Example 1, it will be simpler to operate.

[0042] Example 3

[0043] The same as Example 1, reference Figure 8-Figure 10 , the difference is:

[0044] The one-way seal 12 used includes an annular body 1221 fixed at the bottom of the flow limiting plate 6, the annular body 1221 is distributed at the outer position of the flow limiting hole 7, and a plurality of groups of spring pieces 1222 are fixed in the annular body 1221. When there is no nitrogen flow, the plurality of groups of spring pieces 1222 are in the same plane to achieve sealing. When there is nitrogen flow, the plurality of groups of spring pieces 1222 tilt downward to release the sealing. A baffle 1223 is fixed at the upper position of the corresponding spring piece 1222 in the annular body 1221 to prevent the spring piece 1222 from tilting upward. When nitrogen is introduced, the spring piece 1222 is subjected to downward pressure, so that the spring piece 1222 tilts downward to release the sealing state. At this time, nitrogen can flow through the gap of the spring piece 1222. When the introduction of nitrogen stops, the spring piece 1222 rebounds to achieve sealing. Due to the restriction of the baffle 1223, even if the medium pushes the spring piece 1222 upward, the spring piece 1222 will not tilt upward. Compared with Example 1, the structure is simpler, but the sealing effect is slightly worse.

[0045] Example 4

[0046] The same as Example 1, reference Figure 11-Figure 12 , the difference is:

[0047] The adjusting member 13 used includes a screw rod 1322 threadedly connected to the center of the upper connecting plate 9, a knob 1321 is fixed to the top of the screw rod 1322, and the bottom of the screw rod 1322 is rotatably mounted with the flow limiting plate 6. The use method can refer to the relevant part of Example 2.

[0048] The one-way seal 12 used includes an annular body 1221 fixed to the bottom of the flow limiting plate 6, the annular body 1221 is distributed at the outer position of the flow limiting hole 7, and a plurality of groups of spring pieces 1222 are fixed in the annular body 1221. When there is no nitrogen flow, the plurality of groups of spring pieces 1222 are in the same plane to achieve sealing. When there is nitrogen flow, the plurality of groups of spring pieces 1222 tilt downward to release the sealing. A blocking rod 1223 is fixed above the corresponding spring pieces 1222 in the annular body 1221 to prevent the spring pieces 1222 from tilting upward. For the method of use, please refer to the relevant part of Example 3.

[0049] Example 5

[0050] It is basically the same as Example 1, except that the flow limiting mechanism a is replaced by a common flow limiting orifice plate.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermocouple protection structure, comprising a thermocouple body (1), characterized in that: A protection tube (2) is installed on the outside of the thermocouple body (1), and the end of the protection tube (2) extending into the dust removal pipeline is provided with an arc-shaped notch (3). The medium in the dust removal pipeline flushes the protection tube (2) when flowing downward, flows slowly along the notch (3) and contacts the hot electrode of the thermocouple body (1), so as to reduce direct flushing of the thermocouple body (1); The protection tube (2) located outside the dust removal pipeline is connected to an air inlet pipe (4), and a valve (5) is installed on the air inlet pipe (4). Nitrogen is introduced from the air inlet pipe (4) to fill the gap between the thermocouple body (1) and the protection tube (2) to block the medium from flowing into the gap, and a flow limiting mechanism (a) for balancing the nitrogen backflush flow is installed inside the air inlet pipe (4).

2. The thermocouple protection structure according to claim 1, characterized in that: The flow limiting mechanism (a) comprises a flow limiting plate (6) fixed in the air intake pipe (4), a plurality of groups of flow limiting holes (7) being opened on the flow limiting plate (6), and a plurality of groups of connecting rods (8) being fixedly penetrated through the flow limiting plate (6) along its circumferential direction, an upper connecting plate (9) being slidably mounted on the top of the connecting rods (8), a plurality of groups of strip holes (10) being opened at intervals on the upper connecting plate (9), and a flow limiting block (11) cooperating with the flow limiting holes (7) being fixed on the bottom of the upper connecting plate (9); The upper connecting plate (9) is provided with an adjusting member (13) for limiting the depth of the flow limiting block (11) extending into the flow limiting hole (7); and a one-way sealing member (12) for allowing only nitrogen gas to flow is provided at the bottom of the flow limiting plate (6).

3. The thermocouple protection structure according to claim 2, characterized in that: The adjusting member (13) comprises a blind opening (1311) formed on the edge of the upper connecting plate (9), the blind opening (1311) corresponding to the connecting rod (8) one by one, and a locking screw (1312) for locking the upper connecting plate (9) and the connecting rod (8) is installed in the blind opening (1311).

4. The thermocouple protection structure according to claim 2, characterized in that: The adjusting member (13) comprises a screw rod (1322) threadedly connected to the center of the upper connecting plate (9), a knob (1321) is fixed to the top of the screw rod (1322), and the bottom of the screw rod (1322) is rotatably mounted on the flow limiting plate (6).

5. The thermocouple protection structure according to claim 2, characterized in that: The one-way sealing member (12) comprises a lower connecting plate (1211) fixed to the bottom of the connecting rod (8), a plurality of groups of rectangular holes (1212) are arranged at intervals on the lower connecting plate (1211), a telescopic rod (1213) is fixed to the top of the lower connecting plate (1211) at a position corresponding to the flow limiting hole (7), a sealing plate (1215) is fixed to the top of the telescopic rod (1213), and a spring (1214) is sleeved on the telescopic rod (1213) to press the sealing plate (1215) against the position of the flow limiting hole (7).

6. The thermocouple protection structure according to claim 2, characterized in that: The one-way seal (12) comprises an annular body (1221) fixed at the bottom of the flow limiting plate (6), the annular body (1221) being distributed at the outer side of the flow limiting hole (7), and a plurality of groups of spring sheets (1222) being fixed in the annular body (1221). When there is no nitrogen flow, the plurality of groups of spring sheets (1222) are located in the same plane to achieve sealing, and when there is nitrogen flow, the plurality of groups of spring sheets (1222) tilt downward to release the sealing, and a blocking rod (1223) is fixed in the annular body (1221) at a position above the corresponding spring sheets (1222) to prevent the spring sheets (1222) from tilting upward.

7. The thermocouple protection structure according to claim 2, characterized in that: The size of the top end of the current limiting block (11) is larger than the size of the bottom end thereof.

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