Thermocouple protective sleeve for temperature measurement of molten pool

Abstract

The utility model discloses a thermocouple protective sleeve for temperature measurement of a molten pool, which relates to the technical field of thermocouple protection and comprises a first protective sleeve, one end of the first protective sleeve is open, the other end of the first protective sleeve is closed, one end of a second protective sleeve is provided with a first threaded hole, a connecting piece is arranged between the first protective sleeve and the second protective sleeve, and a thermocouple is arranged in a placing hole. The first threaded hole is in threaded connection with the thermocouple; the thermocouple protective sleeve for molten pool temperature measurement can simultaneously meet the use scene requirements of high temperature resistance, corrosion resistance and good mechanical strength.

Description

Technical Field

[0001] This utility model relates to the field of thermocouple protection technology, specifically a thermocouple protection sleeve for measuring the temperature of a molten pool. Background Technology

[0002] Thermocouples are a commonly used and efficient temperature measuring element. In order for thermocouples to work stably in harsh environments such as high temperature and strong corrosion in the molten pool, protective sleeves are required to protect them.

[0003] However, existing thermocouple protective sleeves are made of metal or ceramic. Metal protective sleeves are easily corroded in the high-temperature molten pool environment, which shortens the service life of the protective sleeve. Frequent replacement will increase production costs and affect the continuity of production. While ceramic protective sleeves perform better in terms of high temperature resistance and corrosion resistance, their mechanical strength is relatively low. When subjected to the scouring of fluid in the molten pool and the external forces during installation and disassembly, they are prone to cracking and damage. Utility Model Content

[0004] The purpose of this invention is to provide a thermocouple protection sleeve for molten pool temperature measurement, which can simultaneously meet the requirements of high temperature resistance, corrosion resistance and good mechanical strength in various application scenarios.

[0005] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: a thermocouple protective sleeve for measuring the temperature of a molten pool, comprising a first protective sleeve, one end of which is open and the other end is closed.

[0006] The second protective sleeve has a first threaded hole at one end;

[0007] A connector is disposed between the first protective sleeve and the second protective sleeve;

[0008] A placement hole is provided, in which a thermocouple is provided, and the first threaded hole is threadedly connected to the thermocouple.

[0009] In some embodiments, the first protective sleeve includes a first tube body, which is inserted into the connector.

[0010] A blind hole is provided at one end of the first tube body near the connector.

[0011] A limiting ring is coaxially disposed on the end of the first tube body near the connector;

[0012] A limiting ring groove is provided between the first tube body and the limiting ring.

[0013] In some embodiments, the connector includes a first connecting post;

[0014] A plug-in hole, which penetrates the first connecting post, and the first protective sleeve is inserted into the plug-in hole;

[0015] The second connecting post is coaxially disposed at the end of the first connecting post near the second protective sleeve, and the second connecting post is detachably connected to the second protective sleeve.

[0016] A connecting hole, which penetrates the second connecting post and connects to the insertion hole.

[0017] In some embodiments, the connector further includes at least three fixing holes, which are arranged in a ring and pass through the first connecting post;

[0018] A fixing bolt is screwed into the fixing hole, and the fixing bolt extends into the limiting ring groove.

[0019] In some embodiments, the second protective sleeve includes a second tube body, one end of which is provided with the first threaded hole;

[0020] The second threaded hole is coaxially located at the end of the second tube body away from the first threaded hole and is screwed into the second connecting post.

[0021] A connecting hole is provided in the second tube body, and the two ends of the connecting hole are respectively connected to the first threaded hole and the second threaded hole, and the connecting hole, the first threaded hole, the second threaded hole, the connecting hole and the blind hole form the placement hole.

[0022] In some embodiments, the connection between the second threaded hole and the second connecting post is coated with high-temperature resistant anti-jamming grease.

[0023] In some embodiments, the second protective sleeve further includes at least one sealing ring groove, the sealing ring groove being disposed at the end of the first threaded hole away from the communicating hole;

[0024] A sealing ring, wherein the sealing ring is disposed within the sealing ring groove.

[0025] In some embodiments, the sealing ring is a high-temperature resistant and corrosion-resistant O-ring or a metal sealing ring.

[0026] In some embodiments, the first protective sleeve is made of silicon nitride, the connector is made of cast iron or stainless steel, and the second protective sleeve is made of cast iron.

[0027] In summary, this utility model has the following beneficial effects:

[0028] This thermocouple protective sleeve for molten pool temperature measurement uses silicon nitride for the first protective sleeve and cast iron or stainless steel for the connectors. The second protective sleeve is made of cast iron, allowing the protective sleeve to simultaneously meet the requirements of high temperature resistance, corrosion resistance, and good mechanical strength, thus achieving comprehensive protection for the thermocouple. The first protective sleeve and the connectors are detachably connected through the cooperation of bolts, limiting ring grooves, and limiting rings. The second protective sleeve is connected to the connectors and the thermocouple via threads, allowing for quick installation and disassembly without complicated installation steps and tools, improving the convenience of maintenance and thus increasing maintenance efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the split-state structure of Embodiment 1 of this utility model;

[0030] Figure 2 This is a cross-sectional view of the connection state in Embodiment 1 of this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the first protective sleeve in Embodiment 1 of this utility model;

[0032] Figure 4 This is a schematic diagram of the connector structure in Embodiment 1 of this utility model;

[0033] Figure 5 This is a schematic diagram of the structure of the second protective sleeve in Embodiment 1 of this utility model;

[0034] Figure 6 This is a schematic diagram of the structure of the second protective sleeve in Embodiment 2 of this utility model;

[0035] Figure 7 This is Embodiment 2 of the present utility model. Figure 6 Enlarged view of point A in the middle.

[0036] In the diagram: 1. First protective sleeve; 11. First tube body; 12. Blind hole; 13. Limiting ring; 14. Limiting ring groove; 2. Second protective sleeve; 21. First threaded hole; 22. Second tube body; 23. Second threaded hole; 24. Connecting hole; 25. Sealing ring groove; 26. Sealing ring; 3. Connecting piece; 31. First connecting post; 32. Insertion hole; 33. Second connecting post; 34. Connecting hole; 35. Fixing hole; 4. Placement hole. Detailed Implementation

[0037] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] Example 1:

[0039] refer to Figure 1-5 A thermocouple protective sleeve for measuring the temperature of a molten pool includes a first protective sleeve 1, a second protective sleeve 2, a connector 3, and a placement hole 4. The first protective sleeve 1 is open at one end and closed at the other end, and can accommodate the bottom of the thermocouple to block the direct impact of high-temperature molten slag and avoid direct contact between the high-temperature molten slag and the thermocouple. The second protective sleeve 2 has a first threaded hole 21 at one end, which can be threadedly connected to the thermocouple to realize the fixed connection between the thermocouple and the protective sleeve. The connector 3 is located between the first protective sleeve 1 and the second protective sleeve 2, and can realize the interchangeable connection between the first protective sleeve 1 and the second protective sleeve 2. The thermocouple is placed in the placement hole 4, and the first threaded hole 21 is threadedly connected to the thermocouple.

[0040] In some embodiments, the first protective sleeve 1 includes a first tube 11, a blind hole 12, a limiting ring 13, and a limiting ring groove 14. The first tube 11 is inserted into the connector 3, which facilitates the installation and disassembly of the first protective sleeve 1 and improves maintenance efficiency. The blind hole 12 is located at the end of the first tube 11 near the connector 3, which can prevent the solution in the furnace from directly contacting the thermocouple and causing damage to the thermocouple. The limiting ring 13 is coaxially located at the end of the first tube 11 near the connector 3. The limiting ring groove 14 is located between the first tube 11 and the limiting ring 13. The cooperation of the limiting ring 13 and the limiting ring groove 14 can effectively limit the axial and radial movement of the first protective sleeve 1 on the connector 3 and ensure the stability of the connection.

[0041] In some embodiments, the connector 3 includes a first connecting post 31, a plug hole 32, a second connecting post 33, a connecting hole 34, and a fixing hole 35. The plug hole 32 passes through the first connecting post 31, and a first protective sleeve 1 is inserted into the plug hole 32 to achieve initial fixation between the first protective sleeve 1 and the connector 3. The second connecting post 33 is coaxially disposed at the end of the first connecting post 31 near the second protective sleeve 2. The second connecting post 33 and the second protective sleeve 2 are detachably connected to facilitate the connection and disassembly of the second protective sleeve 2 and the connector 3. The connecting hole 34 passes through the second connecting post 33 and connects to the plug hole 32 to facilitate the smooth insertion of the thermocouple 5.

[0042] In some embodiments, the connector 3 further includes at least three fixing holes 35, which are arranged in a ring and pass through the first connecting post 31. The fixing bolts are screwed into the fixing holes 35 and extend into the limiting ring groove 14. Through the tightening action of the fixing bolts, the axial and radial movement of the first protective sleeve 1 on the connector 3 can be restricted, thereby achieving a fixed connection between the connector 3 and the first protective sleeve 1 and preventing loosening under high temperature and mechanical vibration environments.

[0043] In some embodiments, the second protective sleeve 2 includes a second tube body 22, a first threaded hole 21, a second threaded hole 23, and a connecting hole 24. One end of the second tube body 22 is provided with the first threaded hole 21 for threaded connection with a thermocouple, thereby fixing and electrically insulating the thermocouple and preventing interference with the thermocouple signal. This is prior art and will not be described in detail here. The second threaded hole 23 is coaxially located at the end of the second tube body 22 away from the first threaded hole 21 and is screwed into the second connecting post 33 to achieve a fixed connection between the second protective sleeve 2 and the connecting piece 3, while facilitating disassembly and replacement. The connecting hole 24 is located inside the second tube body 22, and both ends of the connecting hole 24 are connected to the first threaded hole 21 and the second threaded hole 23, respectively. The connecting hole 24, the first threaded hole 21, the second threaded hole 23, the connecting hole 34, and the blind hole 12 form a placement hole 4, which can accommodate the thermocouple and ensure the correct position and orientation of the thermocouple inside the protective sleeve, which is beneficial to the accuracy of temperature measurement.

[0044] In some embodiments, in order to improve the reliability and service life of the protective sleeve, the connection between the second threaded hole 23 and the second connecting post 33 is coated with high-temperature resistant anti-seize grease, which can maintain good lubrication performance under high temperature conditions, reduce friction and wear between threads, prevent threads from seizing due to high temperature, and facilitate the disassembly and maintenance of the protective sleeve.

[0045] In some embodiments, the first protective sleeve 1 may be made of silicon nitride. Silicon nitride has excellent high-temperature strength, wear resistance and thermal stability, and can work stably for a long time in a high-temperature molten pool environment without being easily deformed or damaged. The connector 3 is made of cast iron or stainless steel. Both cast iron and stainless steel have good mechanical properties and corrosion resistance, and can withstand the stress and high-temperature environment of the connection part. The second protective sleeve 2 is made of cast iron. Cast iron has good casting performance and a certain high-temperature resistance, and at the same time, the cost is relatively low, which helps to reduce production costs.

[0046] In practical applications, firstly, one end of the thermocouple is threaded into the first threaded hole 21 of the second protective sleeve 2, ensuring a secure connection. Then, the open end of the first protective sleeve 1 is inserted into the insertion hole 32 of the connector 3, and the first protective sleeve 1 is tightly secured to the connector 3 using fixing bolts. Next, the second threaded hole 23 of the second protective sleeve 2 is screwed into the second connecting post 33 of the connector 3, and high-temperature resistant anti-seize grease is applied to the connection point to reduce friction and wear. Finally, the entire protective sleeve is installed at the position for measuring the temperature of the molten pool, ensuring that the thermocouple can accurately contact the liquid metal in the molten pool for precise temperature measurement.

[0047] Example 2:

[0048] refer to Figure 6-7 The difference between this embodiment and embodiment 1 is that the second protective sleeve 2 further includes at least one sealing ring groove 25 and a sealing ring 26. The sealing ring groove 25 is located at the end of the first threaded hole 21 away from the connecting hole 24, and the sealing ring 26 is located in the sealing ring groove 25. The sealing ring 26 can be a high-temperature resistant and corrosion-resistant O-ring or a metal sealing ring, which can maintain a good sealing effect in a high-temperature environment, thereby improving the accuracy of thermocouple measurement results.

[0049] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A thermocouple protective sleeve for measuring the temperature of a molten pool, characterized in that: Includes a first protective sleeve (1), which has an open end and a closed end; The second protective sleeve (2) has a first threaded hole (21) at one end; Connector (3), the connector (3) is disposed between the first protective sleeve (1) and the second protective sleeve (2); Placement hole (4), in which a thermocouple is provided, and the first threaded hole (21) is threadedly connected to the thermocouple; The connector (3) includes a first connecting post (31); The insertion hole (32) penetrates the first connecting post (31), and the first protective sleeve (1) is inserted into the insertion hole (32). The second connecting post (33) is coaxially disposed at the end of the first connecting post (31) near the second protective sleeve (2), and the second connecting post (33) and the second protective sleeve (2) are detachably connected; A connecting hole (34) passes through the second connecting post (33) and is connected to the insertion hole (32).

2. The thermocouple protective sleeve for molten pool temperature measurement according to claim 1, characterized in that: The first protective sleeve (1) includes a first tube (11), which is inserted into the connector (3); Blind hole (12), the blind hole (12) is provided at one end of the first tube body (11) near the connector (3); A limiting ring (13) is coaxially disposed on the first tube body (11) near the end of the connector (3); A limiting ring groove (14) is provided between the first tube body (11) and the limiting ring (13).

3. A thermocouple protective sleeve for measuring the temperature of a molten pool according to claim 2, characterized in that: The connector (3) also includes at least three fixing holes (35), which are arranged in a ring and pass through the first connecting post (31). A fixing bolt is screwed into the fixing hole (35) and extends into the limiting ring groove (14).

4. A thermocouple protective sleeve for measuring the temperature of a molten pool according to claim 2, characterized in that: The second protective sleeve (2) includes a second tube (22), one end of which is provided with the first threaded hole (21); The second threaded hole (23) is coaxially located at the end of the second tube body (22) away from the first threaded hole (21) and is screwed into the second connecting post (33); A connecting hole (24) is provided inside the second tube body (22). The two ends of the connecting hole (24) are respectively connected to the first threaded hole (21) and the second threaded hole (23). The connecting hole (24), the first threaded hole (21), the second threaded hole (23), the connecting hole (34) and the blind hole (12) form the placement hole (4).

5. A thermocouple protective sleeve for measuring the temperature of a molten pool according to claim 4, characterized in that: The connection between the second threaded hole (23) and the second connecting post (33) is coated with high-temperature resistant anti-jamming grease.

6. A thermocouple protective sleeve for measuring the temperature of a molten pool according to claim 4, characterized in that: The second protective sleeve (2) further includes at least one sealing ring groove (25), the sealing ring groove (25) being disposed at the end of the first threaded hole (21) away from the communicating hole (24); A sealing ring (26) is disposed in the sealing ring groove (25).

7. A thermocouple protective sleeve for measuring the temperature of a molten pool according to claim 6, characterized in that: The sealing ring (26) is a high-temperature resistant and corrosion-resistant O-ring or metal sealing ring.

8. A thermocouple protective sleeve for measuring the temperature of a molten pool according to claim 7, characterized in that: The first protective sleeve (1) is made of silicon nitride, the connector (3) is made of cast iron or stainless steel, and the second protective sleeve (2) is made of cast iron.

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