Gas turbine exhaust temperature thermocouple core rod connection protective sleeve

Abstract

The utility model discloses a gas turbine exhaust temperature thermocouple core rod connection protective sleeve, which comprises an armored cable fixed with one end of a core rod, the core rod is fixed with a core rod sleeve through a connecting bolt, a welding protective tube is welded and fixed on the outer side wall of the core rod corresponding to the position of the connecting bolt, and the connecting bolt is connected with the core rod through the welding protective tube. The end, facing the armored cable, of the welding protection pipe extends out of the connecting bolt, a gap is formed between the welding protection pipe and the end, connected with the armored cable, of the core rod, and the outer side, located on the side, facing the armored cable, of the connecting bolt, of the core rod is sequentially provided with a connecting sleeve A and a connecting sleeve B used for being connected with temperature measuring equipment from inside to outside. And a flexible sleeve is filled between the connecting sleeve A and the connecting sleeve B. According to the above structure, the gas turbine exhaust temperature thermocouple core rod connection protective sleeve enables the connection part of the core rod and an armored cable to be kept in a safe state through the supporting and protecting effects of the connection sleeve A.

Description

Technical Field

[0001] The utility model relates to the technical field of a gas turbine exhaust temperature detection device, in particular to a combustion turbine exhaust temperature thermocouple core rod connection protection sleeve. Background Art

[0002] The fuel used by gas turbines is natural gas, which contains fewer impurities and has a higher calorific value. Gas boilers have the advantages of energy saving and environmental protection. In order to ensure the power generation efficiency of gas turbines, it is necessary to monitor the exhaust temperature in the gas turbine in real time to ensure that the gas turbine works in appropriate working conditions.

[0003] The exhaust temperature of the gas turbine is monitored by thermocouples. However, during production, the applicant's staff discovered that the exhaust temperature thermocouple of unit #1 has been broken many times since November 2023. The staff found that the location of each break was basically at the connection between the core rod and the armored cable. After this phenomenon occurred during the unit commissioning period, the exhaust temperature measuring points were checked for tightness at the core rod and the equipment installation and at the connection between the core rod and the armored cable, and no looseness problems were found. The resistance of the thermocouple itself was also tested, and the measurements showed normal. Recently, after the #1 unit was started for trial operation and fully loaded, the above-mentioned thermocouple breakage still occurred many times, resulting in a significant increase in the equipment operation and maintenance costs. According to statistics by the staff, the number of thermocouple breakages is also related to the operating status of the equipment. After research and analysis by technical personnel, it was found that, as shown in the attached manual Figure 1~2 As shown, the connection between the core rod and the armored cable of the thermocouple is the most vulnerable point of the entire thermocouple. The reason for the breakage of the connection between the core rod and the armored cable is the vibration caused by the operation of the equipment. Therefore, it is necessary to modify the connection between the core rod and the armored cable of the thermocouple to protect the connection between the core rod and the armored cable and extend the service life of the thermocouple. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a gas turbine exhaust temperature thermocouple core rod connection protection sleeve, through the supporting and protective effect of the connecting sleeve A, so that the connection between the core rod and the armored cable can be kept in a safe state.

[0005] The technical solution adopted by the utility model is:

[0006] A protective sleeve is provided for connecting a core rod of a combustion engine exhaust temperature thermocouple, comprising an armored cable fixedly connected to one end of the core rod, the core rod being fixedly connected to a core rod sleeve by a connecting bolt, a welding protective sleeve is welded and fixed to the outer side wall of the core rod corresponding to the position of the connecting bolt, the connecting bolt is connected to the core rod through the welding protective sleeve, the connecting bolt extends out of the welding protective tube facing one end of the armored cable, a gap is provided between the welding protective tube and one end of the core rod connected to the armored cable, a connecting sleeve A and a connecting sleeve B for connecting to a temperature measuring device are provided in sequence from the inside to the outside on the outer side of the core rod, and a flexible sleeve is filled between the connecting sleeve A and the connecting sleeve B.

[0007] A further improvement of the utility model is that one end of the connecting sleeve A is fixedly connected to the outer side wall of the welding protective tube, and the other end of the connecting sleeve A is fixedly connected to the outer side wall of the connecting end of the armored cable connecting core rod.

[0008] A further improvement of the present invention is that the side walls of the connecting sleeve A are evenly provided with inward protrusions, and the connecting sleeve A is respectively connected to the welding protective tube and the armored cable through the protrusions.

[0009] A further improvement of the present invention is that the connecting sleeve A is a hollow structure, and a through hole is provided at the connection between the protrusion and the side wall of the connecting sleeve A.

[0010] A further improvement of the utility model is that the end of the connecting sleeve A facing the connecting bolt is welded to the outer wall of the welding protective tube through the protrusion at the end pipe mouth, and the end of the connecting sleeve A facing away from the connecting bolt is riveted to the armor structure on the surface of the armored cable through the protrusion at the end pipe mouth.

[0011] A further improvement of the present invention is that the outer diameter of the flexible sleeve and the inner diameter of the connecting sleeve B, as well as the inner diameter of the flexible sleeve and the outer diameter of the connecting sleeve A are both interference fits.

[0012] A further improvement of the present invention is that the sum of the difference between the outer diameter of the flexible sleeve and the inner diameter of the connecting sleeve B and the difference between the inner diameter of the flexible sleeve and the outer diameter of the connecting sleeve A is less than or equal to twice the distance between the protrusion and the outer side wall of the connecting sleeve A.

[0013] A further improvement of the present invention is that the material of the flexible sleeve is thermal insulation silicone.

[0014] A further improvement of the present invention is that the end of the connecting sleeve B facing the connecting bolt is also turned outwardly to be provided with an annular flange, and the annular flange is in contact with the connecting bolt.

[0015] A further improvement of the present invention is that the outer side wall of the connecting sleeve B is evenly provided with reinforcing ribs, and the reinforcing ribs are arranged along the axial direction of the connecting sleeve B.

[0016] A further improvement of the present invention is that the end of the welding protective tube facing one end of the armored cable extends into the connecting sleeve A and is located in the middle of the connecting sleeve A.

[0017] The beneficial effects of the utility model are:

[0018] First, the combustion engine exhaust temperature thermocouple core rod connection protective sleeve of the utility model can maintain a safe state at the connection point between the core rod and the armored cable through the supporting and protective function of the connecting sleeve A.

[0019] Second, the combustion engine exhaust temperature thermocouple core rod connection protective sleeve of the utility model can offset vibration stress through the protrusions provided inwardly on the connecting sleeve A or offset slight vibration of the connection between the armored cable and the core rod through the elastic deformation of the protrusions.

[0020] Third, the combustion engine exhaust temperature thermocouple core rod connection protective sleeve of the utility model, through the effect of the flexible sleeve, when encountering relatively large vibration, the vibration stress is directly transmitted to the flexible sleeve through the connecting sleeve A to offset it.

[0021] Fourthly, the utility model of the protection sleeve for the core rod connection of the combustion engine exhaust temperature thermocouple and the flexible sleeve are made of heat-insulating silicone, which can not only prevent the heat of the core rod from dissipating outwards and causing a decrease in the temperature measurement accuracy, but also prevent the external scalding of the workers at the connection between the core rod and the armored cable.

[0022] Fifth, the core rod connection protective sleeve of the gas turbine exhaust temperature thermocouple of the utility model, the connecting sleeve B can withstand greater stress due to the effect of the reinforcing ribs, thereby helping the core rod and the armored cable connection to further offset stronger equipment vibrations.

[0023] Sixth, in the utility model, the combustion engine exhaust temperature thermocouple core rod connection protection sleeve, the connecting sleeve B can also contact and abut against the connecting bolt through the annular flange, thereby effectively avoiding the vibration of the connecting sleeve B itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of thermocouple in the prior art.

[0025] Figure 2 It is an enlarged cross-sectional schematic diagram of the core rod connection in the prior art.

[0026] Figure 3 It is an enlarged cross-sectional schematic diagram of the core rod connection of the present application. DETAILED DESCRIPTION

[0027] like Figure 3 It can be seen that the core rod connection protective sleeve of the gas turbine exhaust temperature thermocouple includes an armored cable 4 fixedly connected to one end of the core rod 1, the core rod 1 is fixedly connected to the core rod sleeve by a connecting bolt 3, the core rod 1 is welded and fixed with a welding protective tube 2 on the outer wall corresponding to the position of the connecting bolt 3, the connecting bolt 3 is connected to the core rod 1 through the welding protective tube 2, the welding protective tube 2 extends the connecting bolt 3 at one end facing the armored cable 4, and a gap is provided between the welding protective tube 2 and the end of the core rod 1 connected to the armored cable 4, the outer side of the core rod 1 is located on the side of the connecting bolt 3 facing the armored cable 4, and a connecting sleeve A5 and a connecting sleeve B6 for connecting to the temperature measuring equipment are provided in sequence from the inside to the outside, and a flexible sleeve 7 is filled between the connecting sleeve A5 and the connecting sleeve B6.

[0028] One end of the connecting sleeve A5 is fixedly connected to the outer side wall of the welding protective tube 2 , and the other end of the connecting sleeve A5 is fixedly connected to the outer side wall of the connecting end of the armored cable 4 connecting the core rod 1 .

[0029] The side walls of the connecting sleeve A5 are evenly provided with inward protrusions 8, and the connecting sleeve A5 is connected to the welding protective tube 2 and the armored cable 4 respectively through the protrusions 8.

[0030] The connecting sleeve A5 is a hollow structure, and a through hole is provided at the connection between the protrusion 8 and the side wall of the connecting sleeve A5.

[0031] The end of the connecting sleeve A5 facing the connecting bolt 3 is welded to the outer wall of the welding protective tube 2 through the protrusion 8 at the end pipe mouth, and the end of the connecting sleeve A5 facing away from the connecting bolt 3 is riveted to the armor structure on the surface of the armored cable 4 through the protrusion 8 at the end pipe mouth.

[0032] The outer diameter of the flexible sleeve 7 and the inner diameter of the connecting sleeve B6, as well as the inner diameter of the flexible sleeve 7 and the outer diameter of the connecting sleeve A5 are both interference fits.

[0033] The sum of the difference between the outer diameter of the flexible sleeve 7 and the inner diameter of the connecting sleeve B6 and the difference between the inner diameter of the flexible sleeve 7 and the outer diameter of the connecting sleeve A5 is less than or equal to twice the distance between the protrusion 8 and the outer side wall of the connecting sleeve A5.

[0034] The flexible sleeve 7 is made of heat-insulating silica gel.

[0035] The end of the connecting sleeve B6 facing the connecting bolt 3 is also turned outward to be provided with an annular flange 9, and the annular flange 9 is in contact with the connecting bolt 3.

[0036] The outer wall of the connecting sleeve B6 is also evenly provided with reinforcing ribs, and the reinforcing ribs are arranged along the axial direction of the connecting sleeve B6.

[0037] The end of the welding protective tube 2 facing one end of the armored cable 4 extends into the connecting sleeve A5 and is located in the middle of the connecting sleeve A5.

[0038] When the present application produces and installs the connecting sleeve, the connecting sleeve B6 and the flexible sleeve 7 are pre-sleeved on the armored cable 4 from one end of the core rod 1 to be connected; then the two ends of the connecting sleeve A5 are respectively sleeved on the welding protective tube 2 fixed to the outer wall of the core rod 1. After the core rod 1 and the armored cable 4 are fixedly connected, the connecting sleeve A5 is moved along the axis of the core rod 1 toward one end of the armored cable 4 until the connecting sleeve A5 contacts the outer wall of the end of the core rod 1 connected to the armored cable 4; then the connecting sleeve A5 is riveted and fixed to the armored cable 4, and the connecting sleeve A5 is welded and fixed to the welding protective tube 2; then the flexible sleeve 7 is moved from the armored cable 4 to the core rod 1 until it is sleeved on the surface of the connecting sleeve A5; due to the flexible characteristics of the flexible sleeve 7, although the inner diameter of the flexible sleeve 7 and the outer diameter of the connecting sleeve A5 are interference fit, the flexible sleeve 7 can still be easily sleeved on the connecting sleeve A5 On; after the flexible sleeve 7 is put on the connecting sleeve A5, the inner wall of the flexible sleeve 7 will match and fit with the side wall of the connecting sleeve A5, and the position where the protrusion 8 is provided inwardly on the side wall of the connecting sleeve A5 will also be filled with the flexible sleeve 7; then the connecting sleeve B6 is also moved from the armored cable 4 to the core rod 1 until it is put on the surface of the flexible sleeve 7; due to the flexible characteristics of the flexible sleeve 7, although the outer diameter of the flexible sleeve 7 and the inner diameter of the connecting sleeve B6 are interference fit, and the inner wall of the flexible sleeve 7 fits on the surface of the connecting sleeve A5 with the inward protrusion 8, so that there is no relative sliding between the flexible sleeve 7 and the connecting sleeve A5, the connecting sleeve B6 can still be conveniently put on the flexible sleeve 7 during installation; after the connecting sleeve B6 is put on the flexible sleeve 7, the flexible sleeve 7 is more tightly fitted and fixed to the connecting sleeve A5 under the pressure limit of the connecting sleeve B6. The subsequent installation is the same as the normal installation, wherein the connecting bolt 3 can directly limit the annular flange 9 of the connecting sleeve B6 and quickly locate and fix it at the corresponding position on the welding protective tube 2 of the core rod 1.

[0039] When the present application is used, one end of the core rod of the thermocouple is inserted and fixed at the position of the probe insertion hole set by the temperature detection device. In use, when the equipment vibrates, the connection between the core rod 1 and the armored cable 4 can be kept in a safe state through the supporting and protective effect of the connecting sleeve A5; when the connection between the armored cable 4 and the core rod 1 is slightly resonated by the stress generated by the vibration of the equipment, the protrusion 8 provided inwardly by the connecting sleeve A5 can offset the vibration stress through the protrusion 8 or offset the slight vibration of the connection between the armored cable 4 and the core rod 1 through the elastic deformation of the protrusion 8. If the vibration of the equipment is strong, the relatively large vibration stress is directly transmitted to the flexible sleeve 7 through the connecting sleeve A5 for offset. If there is a stronger vibration, the vibration stress is further transmitted to the connecting sleeve B6 by the flexible sleeve 7, and the connecting sleeve B6 can withstand a larger stress due to the effect of the reinforcing ribs. Moreover, the connecting sleeve B6 can also contact and counteract the connecting bolt 3 through the annular flange 9, thereby effectively avoiding the vibration of the connecting sleeve B6 itself.

Claims

1. A protective sleeve for connecting the core rod of the thermocouple of the exhaust temperature of the gas turbine, characterized in that: The invention comprises an armored cable (4) fixedly connected to one end of a core rod (1), the core rod (1) being fixedly connected to a core rod sleeve via a connecting bolt (3), a welding protective tube (2) being welded and fixed to the outer wall of the core rod (1) corresponding to the position of the connecting bolt (3), the connecting bolt (3) being connected to the core rod (1) via the welding protective tube (2), the connecting bolt (3) extending out of the end of the welding protective tube (2) facing the armored cable (4), a gap being provided between the welding protective tube (2) and the end of the core rod (1) connected to the armored cable (4), a connecting sleeve A (5) and a connecting sleeve B (6) for connecting to a temperature measuring device being provided on the outer side of the core rod (1) on the side of the connecting bolt (3) facing the armored cable (4), and a flexible sleeve (7) being filled between the connecting sleeve A (5) and the connecting sleeve B (6).

2. The combustion engine exhaust temperature thermocouple core rod connection protective cover according to claim 1, characterized in that: One end of the connecting sleeve A (5) is fixedly connected to the outer side wall of the welding protective tube (2), and the other end of the connecting sleeve A (5) is fixedly connected to the outer side wall of the connecting end of the connecting core rod (1) of the armored cable (4).

3. The combustion engine exhaust temperature thermocouple core rod connection protective cover according to claim 2, characterized in that: The side wall of the connecting sleeve A (5) is evenly provided with inward protrusions (8), and the connecting sleeve A (5) is respectively connected to the welding protective tube (2) and the armored cable (4) through the protrusions (8).

4. The combustion engine exhaust temperature thermocouple core rod connection protective cover as claimed in claim 3, characterized in that: The connecting sleeve A (5) is a hollow structure, and a through hole is provided at the connection between the protrusion (8) and the side wall of the connecting sleeve A (5).

5. The combustion engine exhaust temperature thermocouple core rod connection protective cover as claimed in claim 3, characterized in that: The end of the connecting sleeve A (5) facing the connecting bolt (3) is welded to the outer wall of the welding protective tube (2) via a protrusion (8) at the end pipe opening, and the end of the connecting sleeve A (5) facing away from the connecting bolt (3) is riveted to the armor structure on the surface of the armored cable (4) via the protrusion (8) at the end pipe opening.

6. The combustion engine exhaust temperature thermocouple core rod connection protective cover according to claim 1, characterized in that: The outer diameter of the flexible sleeve (7) and the inner diameter of the connecting sleeve B (6), as well as the inner diameter of the flexible sleeve (7) and the outer diameter of the connecting sleeve A (5) are both interference fits.

7. The combustion engine exhaust temperature thermocouple core rod connection protective cover according to claim 1, characterized in that: The material of the flexible sleeve (7) is heat-insulating silica gel.

8. The combustion engine exhaust temperature thermocouple core rod connection protective cover according to claim 1, characterized in that: The end of the connecting sleeve B (6) facing the connecting bolt (3) is also provided with an annular flange (9) turned outward, and the annular flange (9) is in contact with the connecting bolt (3).

9. The combustion engine exhaust temperature thermocouple core rod connection protective cover according to claim 1, characterized in that: The outer wall of the connecting sleeve B (6) is also evenly provided with reinforcing ribs, and the reinforcing ribs are arranged along the axial direction of the connecting sleeve B (6).

10. The combustion engine exhaust temperature thermocouple core rod connection protective cover according to claim 1, characterized in that: The end of the welding protective tube (2) facing one end of the armored cable (4) extends into the connecting sleeve A (5) and is located in the middle of the connecting sleeve A (5).

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