Thermocouple capable of rapidly replacing protective sleeve

Abstract

The utility model relates to the technical field of thermocouples, in particular to a thermocouple capable of quickly replacing a protective sleeve, which comprises a thermocouple main body and a protective sleeve assembly. The protective sleeve assembly is connected with the thermocouple main body through a quick connection structure, and the quick connection structure comprises a positioning piece, a locking device and a guide assembly. The locking device is composed of an annular clamping groove and an elastic clamping jaw and is matched with a sealing ring to achieve reliable sealing. The guide assembly ensures accurate installation and alignment, and the unlocking groove is convenient to disassemble. The protective sleeve assembly is convenient to mount and dismount through the quick connecting structure, the problem of thread abrasion is avoided, the maintenance efficiency is improved, meanwhile, the operation experience is optimized, and the problems that replacement is inconvenient and the sealing performance is reduced in the prior art are solved.

Description

Technical Field

[0001] This invention belongs to the field of temperature measurement and sensor technology, specifically a thermocouple with a quick-change protective sheath. Background Technology

[0002] In industrial temperature measurement, thermocouples are commonly used temperature measuring devices, and the durability and ease of replacement of their protective sheaths directly affect the equipment's operating efficiency and maintenance costs. Currently, most common thermocouple protective sheaths are fixed using threaded connections or welding. While these connection methods meet basic sealing and stability requirements, in actual use, when the protective sheath needs replacement due to wear or corrosion, specialized tools or complex disassembly operations are often required, leading to extended maintenance time. Furthermore, the design of some thermocouple protective sheaths places high demands on the space and operating conditions of the installation environment, further increasing the difficulty of replacement.

[0003] Therefore, we have made improvements and proposed a thermocouple with a quick-change protective sheath. Utility Model Content

[0004] The purpose of this invention is to solve the problems of inconvenient replacement of thermocouple protective sleeves, low maintenance efficiency, and decreased sealing performance caused by frequent disassembly and assembly.

[0005] To achieve the aforementioned objectives and address the aforementioned problems, this utility model provides a thermocouple with a quick-change protective sheath, comprising a thermocouple body and a protective sheath assembly. The protective sheath assembly is connected to the thermocouple body via a quick-connect structure, which includes a positioning element, a locking device, and a guiding component. The positioning element is fixed to one end of the thermocouple body, the locking device is located inside the protective sheath assembly and works in conjunction with the positioning element, and the guiding component assists in accurate alignment of the protective sheath assembly during installation. The quick installation and removal of the protective sheath assembly is achieved through the coordinated action of the positioning element, the locking device, and the guiding component.

[0006] The locking device includes an annular groove and an elastic claw. The annular groove is formed on the outer wall of the thermocouple body near the positioning element. The elastic claw is fixed to the inner wall of the protective sleeve assembly and is adapted to the annular groove. When the protective sleeve assembly is fitted onto the outside of the thermocouple body, the elastic claw is embedded in the annular groove to form a locked state, thereby completing the fixation of the protective sleeve assembly.

[0007] As a preferred technical solution of this application, the positioning component includes a positioning boss and a limiting ring. The positioning boss is fixed to one end of the thermocouple body, and the limiting ring is located on the periphery of the positioning boss. The diameter of the limiting ring is larger than the inner diameter of the protective sleeve assembly. When the protective sleeve assembly slides to one end of the thermocouple body, the limiting ring acts as a stop to prevent the protective sleeve assembly from sliding excessively.

[0008] As a preferred technical solution of this application, the guiding component includes a guide sleeve and a guide groove. The guide sleeve is fixed to the inner wall of the protective sleeve assembly, and the guide groove is opened on the outer wall of the thermocouple body. The guide sleeve and the guide groove cooperate with each other. When the protective sleeve assembly slides along the thermocouple body, the guide sleeve is embedded in the guide groove to ensure that the installation direction of the protective sleeve assembly is accurate.

[0009] As a preferred technical solution of this application, the elastic claw includes multiple arc-shaped pieces, which are evenly distributed on the inner wall of the protective sleeve assembly. One end of each arc-shaped piece is fixedly connected to the inner wall of the protective sleeve assembly, and the other end is bent inward to form a latching part. The shape of the latching part matches the cross-sectional shape of the annular groove. When the protective sleeve assembly is fitted onto the thermocouple body, the arc-shaped pieces undergo elastic deformation due to force, allowing the latching part to smoothly enter the annular groove and return to its original shape, thereby achieving locking.

[0010] As a preferred technical solution of this application, the protective sleeve assembly further includes a sealing ring, which is disposed on the inner wall of the protective sleeve assembly and located behind the elastic claw. When the protective sleeve assembly is connected to the thermocouple body, the sealing ring is tightly fitted to the outer wall of the thermocouple body to prevent external media from entering the interior of the protective sleeve assembly.

[0011] As a preferred technical solution of this application, the outer wall of the protective sleeve assembly is provided with anti-slip texture, which is distributed in a spiral shape to facilitate the operator to apply torque when installing or disassembling the protective sleeve assembly.

[0012] As a preferred technical solution of this application, the outer wall of the thermocouple body is also provided with an unlocking groove. The unlocking groove is located behind the annular slot, and the width of the unlocking groove is greater than the width of the annular slot. When it is necessary to disassemble the protective sleeve assembly, a special tool can be inserted into the unlocking groove to push the elastic claw to expand outward and release its locked state with the annular slot.

[0013] As a preferred technical solution of this application, the front end of the protective sleeve assembly is provided with a tapered inlet section, the diameter of which gradually decreases from the opening end of the protective sleeve assembly, so that the protective sleeve assembly can be smoothly fitted onto the thermocouple body during installation.

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

[0015] The protective sleeve assembly is designed with positioning components, locking devices, and guiding components, enabling rapid installation and removal. Specifically, when the protective sleeve assembly is fitted onto the thermocouple body, the guiding component guides the assembly to accurate alignment. The elastic claws deform under force and engage in the annular groove to lock in place, thus securing the assembly. For removal, the protective sleeve assembly can be easily removed by unlocking the groove. This design not only simplifies installation but also avoids thread wear issues caused by frequent disassembly and reassembly in traditional threaded connections. Furthermore, the sealing ring further enhances the overall sealing performance. In addition, the anti-slip texture and tapered guide section design make operation more convenient, solving the problems of inconvenient protective sleeve replacement and low maintenance efficiency in existing technologies. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the annular slot structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the guide component structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the locking device structure of this utility model.

[0020] The attached figures are labeled as follows:

[0021] 1. Thermocouple body; 2. Protective sleeve assembly; 3. Positioning component; 4. Locking device; 5. Guide assembly; 6. Annular groove; 7. Elastic claw; 8. Positioning boss; 9. Limiting ring; 10. Guide sleeve; 11. Guide groove; 12. Sealing ring; 13. Unlocking groove; 14. Conical inlet section. Detailed Implementation

[0022] This utility model provides a thermocouple with a quick-change protective sheath, the specific implementation of which is as follows. Figure 1 As shown, the overall structure includes a thermocouple body 1 and a protective sheath assembly 2, which are connected by a quick-connect structure. This quick-connect structure consists of a positioning element 3, a locking device 4, and a guiding component 5. The positioning element 3 is fixed to one end of the thermocouple body 1, the locking device 4 is located inside the protective sheath assembly 2 and works in conjunction with the positioning element 3, and the guiding component 5 assists in accurately aligning the protective sheath assembly 2 during installation. This design enables rapid installation and removal of the protective sheath assembly 2.

[0023] The specific structure of positioning component 3 is as follows: Figure 3As shown, the positioning component 3 includes a positioning boss 8 and a limiting ring 9. The positioning boss 8 is fixed to one end of the thermocouple body 1, and the limiting ring 9 is located around the positioning boss 8 with a diameter larger than the inner diameter of the protective sleeve assembly 2. When the protective sleeve assembly 2 slides along the thermocouple body 1 to one end, the limiting ring 9 acts as a stop to prevent the protective sleeve assembly 2 from sliding excessively. The design of the positioning boss 8 provides an initial positioning reference for the protective sleeve assembly 2, ensuring that the protective sleeve assembly 2 can be accurately fitted into the thermocouple body 1.

[0024] The structure of locking device 4 is as follows Figure 2 As shown, the device includes an annular groove 6 and elastic claws 7. The annular groove 6 is formed on the outer wall of the thermocouple body 1 near the positioning element 3. The elastic claws 7 are fixed to the inner wall of the protective sleeve assembly 2 and are adapted to the annular groove 6. The elastic claws 7 include multiple arc-shaped pieces, which are evenly distributed on the inner wall of the protective sleeve assembly 2. One end of each arc-shaped piece is fixedly connected to the inner wall of the protective sleeve assembly 2, and the other end is bent inward to form a latching part. The shape of the latching part matches the cross-sectional shape of the annular groove 6. When the protective sleeve assembly 2 is fitted onto the outside of the thermocouple body 1, the arc-shaped pieces undergo elastic deformation due to force, allowing the latching part to smoothly enter the annular groove 6 and return to its original shape, thereby completing the locking.

[0025] The structure of guide component 5 is as follows Figure 4 As shown, the system includes a guide sleeve 10 and a guide groove 11. The guide sleeve 10 is fixed to the inner wall of the protective sleeve assembly 2, and the guide groove 11 is formed on the outer wall of the thermocouple body 1. The guide sleeve 10 and the guide groove 11 cooperate with each other. When the protective sleeve assembly 2 slides along the thermocouple body 1, the guide sleeve 10 is embedded in the guide groove 11, ensuring that the installation direction of the protective sleeve assembly 2 is accurate. The length of the guide groove 11 is designed to be slightly longer than the sliding stroke of the guide sleeve 10 to avoid installation failure due to dimensional errors.

[0026] To improve the overall sealing performance, the protective sleeve assembly 2 also includes a sealing ring 12. The sealing ring 12 is located on the inner wall of the protective sleeve assembly 2 and behind the elastic claw 7. When the protective sleeve assembly 2 is connected to the thermocouple body 1, the sealing ring 12 fits tightly against the outer wall of the thermocouple body 1, preventing external media from entering the interior of the protective sleeve assembly 2. The sealing ring 12 is made of a high-temperature resistant and corrosion-resistant material to adapt to the working environment of the thermocouple.

[0027] To facilitate the application of torque by operators during the installation or removal of the protective sleeve assembly 2, the outer wall of the protective sleeve assembly 2 is provided with anti-slip textures. These textures are distributed in a spiral pattern, increasing the friction between the operator's hand or tool and the protective sleeve assembly 2, thereby improving ease of operation. Furthermore, the front end of the protective sleeve assembly 2 is provided with a tapered guide section 14, such as... Figure 4As shown. The diameter of the tapered inlet section 14 gradually decreases from the open end of the protective sleeve assembly 2, which facilitates the smooth installation of the protective sleeve assembly 2 onto the thermocouple body 1 during installation.

[0028] When it is necessary to disassemble the protective sleeve assembly 2, the locking state can be released through the unlocking slot 13. The unlocking slot 13 is located behind the annular groove 6 and is wider than the annular groove 6. When it is necessary to disassemble the protective sleeve assembly 2, a special tool can be inserted into the unlocking slot 13 to push the elastic claw 7 outward to expand it and disengage it from the annular groove 6, thereby releasing the locking state. The design of the unlocking slot 13 simplifies the disassembly process and avoids wear problems caused by frequent disassembly and assembly.

[0029] In practical applications, the thermocouple body 1 is typically installed at the measuring point of industrial equipment to detect temperature changes. The protective sleeve assembly 2 protects the thermocouple body 1 from external environmental influences. When the protective sleeve assembly 2 is damaged due to prolonged use or needs replacement, the operator simply slides it along the thermocouple body 1 to the positioning element 3, ensuring accurate alignment guided by the guide component 5. The elastic claw 7 then automatically engages with the annular groove 6 to lock in place. The entire installation process requires no additional tools and takes only a few seconds. For disassembly, the operator uses a special tool inserted into the unlocking groove 13 to push the elastic claw 7 outwards, easily removing the protective sleeve assembly 2.

[0030] The specific embodiments of this utility model have been described above, detailing the connection relationships, positional relationships, and mutual cooperation relationships between the various components. Through the synergistic action of the positioning component 3, the locking device 4, and the guiding assembly 5, the rapid installation and disassembly of the protective sleeve assembly 2 is achieved, solving the problems of inconvenient replacement and low maintenance efficiency of the protective sleeve in the prior art.

[0031] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the implementation principle of this utility model is provided in conjunction with specific application scenarios.

[0032] In the actual operation of industrial temperature measuring equipment, the thermocouple body 1 is typically installed in a high-temperature, high-pressure measurement environment for real-time monitoring of temperature changes. The protective sheath assembly 2, as the external protective structure of the thermocouple body 1, primarily functions to isolate it from external corrosive media and mechanical impacts, thereby extending the thermocouple's service life. However, after prolonged use, the protective sheath assembly 2 may need to be replaced due to wear or corrosion. At this point, the advantages of a quick-replacement design become apparent.

[0033] First, the operator slides the new protective sheath assembly 2 along the axial direction of the thermocouple body 1. Because the front end of the protective sheath assembly 2 has a tapered inlet section 14, as... Figure 3As shown, the diameter of the tapered inlet section 14 gradually decreases from the open end, allowing the protective sleeve assembly 2 to be easily fitted onto the thermocouple body 1. The design of the tapered inlet section 14 not only reduces the resistance during initial installation but also ensures the coaxial alignment between the protective sleeve assembly 2 and the thermocouple body 1, avoiding jamming problems caused by installation angle deviations.

[0034] When the protective sheath assembly 2 slides along the thermocouple body 1, the guide assembly 5 begins to function. For example... Figure 4 As shown, the guide sleeve 10 is fixed to the inner wall of the protective sleeve assembly 2, while the guide groove 11 is formed on the outer wall of the thermocouple body 1. The guide sleeve 10 and the guide groove 11 cooperate with each other to ensure that the sliding direction of the protective sleeve assembly 2 remains consistent. This design effectively avoids misalignment caused by improper operation, and the length of the guide groove 11 is slightly longer than the sliding stroke of the guide sleeve 10, providing tolerance space for the installation process and further improving the reliability of the installation.

[0035] As the protective sleeve assembly 2 continues to slide, the elastic claw 7 gradually approaches the annular groove 6. Figure 2 As shown, the elastic claw 7 consists of multiple arc-shaped pieces evenly distributed on the inner wall of the protective sleeve assembly 2. When the protective sleeve assembly 2 is fitted into the annular groove 6, the arc-shaped pieces undergo elastic deformation under force, and their locking parts smoothly enter the annular groove 6 and return to their original shape, thus completing the locking process. During this process, the elastic deformation characteristics of the elastic claw 7 ensure that the locking parts can automatically embed into the annular groove 6 without the need for additional tools, significantly shortening the installation time.

[0036] At the same time, the design of positioning element 3 further enhances the accuracy of installation. For example... Figure 3 As shown, the positioning boss 8 is fixed to one end of the thermocouple body 1, and the limiting ring 9 is located around the positioning boss 8, with a diameter larger than the inner diameter of the protective sleeve assembly 2. When the protective sleeve assembly 2 slides to the positioning element 3, the limiting ring 9 acts as a stop to prevent the protective sleeve assembly 2 from sliding excessively. This design not only simplifies the installation operation but also ensures that the protective sleeve assembly 2 is fixed in position on the thermocouple body 1, avoiding installation failure due to excessive sliding.

[0037] After the protective sleeve assembly 2 is connected to the thermocouple body 1, the function of the sealing ring 12 becomes apparent. For example... Figure 1 As shown, the sealing ring 12 is located on the inner wall of the protective sleeve assembly 2 and is in close contact with the outer wall of the thermocouple body 1. The sealing ring 12 is made of high temperature and corrosion resistant material, which can maintain good sealing performance under high temperature and high pressure environment, prevent external media from penetrating into the interior of the protective sleeve assembly 2, and thus ensure the normal operation of the thermocouple body 1.

[0038] When it is necessary to disassemble the protective sleeve assembly 2, the operator can use a special tool inserted into the unlocking slot 13. For example... Figure 2 As shown, the unlocking slot 13 is located behind the annular slot 6, and its width is greater than that of the annular slot 6. A special tool is used to push the elastic claw 7 outwards, disengaging it from the annular slot 6 and thus releasing the locked state. This design not only simplifies the disassembly process but also avoids wear and tear on the locking device 4 caused by frequent disassembly and assembly, extending the service life of the overall structure.

[0039] In addition, the outer wall of the protective sleeve assembly 2 is provided with spirally distributed anti-slip textures, such as... Figure 1 As shown, the anti-slip texture increases the friction between the hand or tool and the protective sleeve assembly 2, making operation more convenient. This design is particularly suitable for installation and removal operations in confined spaces, further improving maintenance efficiency.

[0040] In summary, this invention achieves rapid installation and disassembly of the protective sleeve assembly 2 through the coordinated action of the positioning component 3, the locking device 4, and the guiding component 5. In practical applications, the operator only needs to slide the protective sleeve assembly 2 along the thermocouple body 1 to the positioning component 3, accurately align it with the guidance of the guiding component 5, and then the elastic claw 7 automatically engages with the annular groove 6 to complete the locking. The entire process requires no additional tools and can be completed in just a few seconds. During disassembly, the protective sleeve assembly 2 can be easily removed by unlocking the locking groove 13. This design not only solves the problem of inconvenient replacement of the protective sleeve in existing technologies but also significantly improves maintenance efficiency. Furthermore, the sealing performance of the overall structure is further enhanced by the sealing ring 12, adapting to the needs of special working conditions such as high temperature and high pressure.

Claims

1. A thermocouple with a quick-change protective sheath, characterized in that, The device includes a thermocouple body (1) and a protective sleeve assembly (2). The protective sleeve assembly (2) is connected to the thermocouple body (1) via a quick-connect structure. The quick-connect structure includes a positioning element (3), a locking device (4), and a guide assembly (5). The positioning element (3) is fixed to one end of the thermocouple body (1). The locking device (4) is located inside the protective sleeve assembly (2) and works in conjunction with the positioning element (3). The guide assembly (5) is used to assist the protective sleeve assembly (2) in accurate alignment during installation.

2. The thermocouple with a quick-change protective sheath according to claim 1, characterized in that, The locking device (4) includes an annular groove (6) and an elastic claw (7). The annular groove (6) is opened on the outer wall of the thermocouple body (1) near the positioning member (3). The elastic claw (7) is fixed to the inner wall of the protective sleeve assembly (2) and is adapted to the annular groove (6). Multiple arc-shaped pieces are evenly distributed on the inner wall of the protective sleeve assembly (2). One end of each arc-shaped piece is fixedly connected to the inner wall of the protective sleeve assembly (2), and the other end is bent inward to form a buckle. The shape of the buckle matches the cross-sectional shape of the annular groove (6).

3. The thermocouple with a quick-change protective sheath according to claim 1, characterized in that, The positioning component (3) includes a positioning boss (8) and a limiting ring (9). The positioning boss (8) is fixed to one end of the thermocouple body (1), and the limiting ring (9) is located on the periphery of the positioning boss (8). The diameter of the limiting ring (9) is larger than the inner diameter of the protective sleeve assembly (2).

4. A thermocouple with a quick-change protective sheath according to claim 1, characterized in that, The guide assembly (5) includes a guide sleeve (10) and a guide groove (11). The guide sleeve (10) is fixed to the inner wall of the protective sleeve assembly (2), and the guide groove (11) is opened on the outer wall of the thermocouple body (1). The guide sleeve (10) and the guide groove (11) cooperate with each other.

5. A thermocouple with a quick-change protective sheath according to claim 1, characterized in that, The protective sleeve assembly (2) also includes a sealing ring (12), which is disposed on the inner wall of the protective sleeve assembly (2) and located behind the elastic claw (7).

6. A thermocouple with a quick-change protective sheath according to claim 1, characterized in that, The outer wall of the thermocouple body (1) is provided with an unlocking groove (13), which is located behind the annular slot (6). The width of the unlocking groove (13) is greater than the width of the annular slot (6).

7. A thermocouple with a quick-change protective sheath according to claim 1, characterized in that, The outer wall of the protective sleeve assembly (2) is provided with anti-slip texture, which is distributed in a spiral shape.

8. A thermocouple with a quick-change protective sheath according to claim 1, characterized in that, The front end of the protective sleeve assembly (2) is provided with a tapered inlet section (14), the diameter of which gradually decreases from the opening end of the protective sleeve assembly (2).

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