Thermocouple with protective sleeve

Abstract

The utility model provides a thermocouple with a protective sleeve, and particularly relates to the technical field of thermocouples. The thermocouple comprises a junction box, a feeler lever, a protective sleeve and an auxiliary installation mechanism, one end of the feeler lever is fixedly connected with the junction box, the outer wall of the feeler lever is sleeved with the protective sleeve, the auxiliary installation mechanism is arranged at the connecting position of the protective sleeve and the feeler lever, and the auxiliary installation mechanism comprises a fixing ring, a positioning groove, a containing cavity and a positioning block. The fixing ring is fixed to the top of the protective sleeve, the positioning groove is formed in the inner wall of the top of the fixing ring, the containing cavity is formed in the inner wall of the fixing ring at the bottom of the positioning groove and used for containing the positioning block and limiting axial movement of the positioning block, and the positioning block is correspondingly arranged on the outer wall of the probe rod and rotates in the containing cavity along with rotation of the probe rod. The auxiliary installation mechanism does not need to be operated by professional workers, rapid installation of the protective sleeve and the probe rod can be achieved, the installation time is greatly shortened, and the installation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of thermocouple technology, specifically to a thermocouple with a protective sleeve. Background Technology

[0002] Thermocouples, as temperature sensing devices, are widely used in industrial temperature monitoring. They convert the physical quantity of temperature into a measurable micro-electrical signal through the thermoelectric effect and transmit the signal to a display instrument or control system to achieve real-time sensing and feedback of temperature changes. Currently, thermocouples are widely used in petrochemical, power energy, metallurgical, food and pharmaceutical industries, and other fields.

[0003] However, in practical industrial applications, thermocouple probes are often exposed to extreme operating conditions. For example, in chemical reactors, high-temperature furnaces, or high-speed fluid pipelines, bare thermocouple probes are susceptible to physical impacts such as media erosion, mechanical vibration, and human collisions, leading to structural damage and consequently causing measurement signal distortion or failure. Furthermore, acid and alkali corrosion, oxidizing atmospheres, and high-temperature thermal corrosion in complex environments can reduce the probe's service life. While existing technologies incorporate protective sleeves for the thermocouple probes, these structures still require frequent replacement after prolonged use. Traditional methods of mounting the protective sleeve and probe, such as welding or bolting, require skilled technicians and are time-consuming and inefficient.

[0004] Therefore, a new method for installing the protective sleeve and thermocouple probe is needed to improve the problems of long replacement time and low installation efficiency of the protective sleeve. Utility Model Content

[0005] In view of the problems existing in the prior art, the present invention provides a thermocouple with a protective sleeve to improve the problem of complicated and time-consuming replacement of the protective sleeve.

[0006] To achieve the above and other related objectives, this utility model provides a thermocouple with a protective sleeve, comprising: a junction box, a probe, a protective sleeve, and an auxiliary installation mechanism. One end of the probe is fixedly connected to the junction box. The protective sleeve is fitted onto the outer wall of the probe. The auxiliary installation mechanism is disposed at the connection position between the protective sleeve and the probe. The auxiliary installation mechanism includes a fixing ring, a positioning groove, a receiving cavity, and a positioning block. The fixing ring is fixed to the top of the protective sleeve. The positioning groove is disposed on the inner wall of the top of the fixing ring. The receiving cavity is disposed on the inner wall of the fixing ring at the bottom of the positioning groove. The receiving cavity is used to accommodate the positioning block and restrict the axial movement of the positioning block. The positioning block is correspondingly disposed on the outer wall of the probe and rotates within the receiving cavity as the probe rotates.

[0007] In one embodiment of the present invention, the auxiliary installation mechanism further includes a stop block and a limiting plate. The stop block and the positioning block are alternately arranged on the outer wall of the probe rod, and the stop block is located above the positioning block. The limiting plate is arranged on the top of the fixing ring and located on one side of the positioning groove. The height of the limiting plate is greater than the height of the stop block.

[0008] In one embodiment of the present invention, the shape and size of the positioning block match the shape and size of the positioning groove, and the size of the stop block is larger than the size of the positioning groove.

[0009] In one embodiment of the present invention, the auxiliary installation mechanism includes two positioning grooves and two positioning blocks, the two positioning blocks being disposed opposite each other on the inner wall of the top end of the fixing ring, and the two positioning blocks being disposed opposite each other on the outer wall of the probe rod.

[0010] In one embodiment of the present invention, the auxiliary installation mechanism includes two stops, which are alternately arranged with the two positioning blocks on the outer wall of the probe rod, and the center line connecting the two stops is perpendicular to the center line connecting the two positioning blocks.

[0011] In one embodiment of the present invention, an annular limiting barrier is provided on the inner wall of the fixing ring below the positioning groove, and the receiving cavity is formed between the annular limiting barrier and the bottom of the positioning groove.

[0012] In one embodiment of the present invention, the top end of the fixing ring is provided with an arc-shaped groove, and a sealing strip is provided in the arc-shaped groove.

[0013] In one embodiment of the present invention, a collar is provided on the probe rod at the top of the stop block, and an insert plate is slidably provided on the collar, the insert plate being inserted into the arc-shaped groove.

[0014] In one embodiment of the present invention, a plurality of guide rods are spaced apart on the collar, the guide rods extend along the axial direction of the probe rod, and the insert plate is fitted onto the plurality of guide rods.

[0015] In one embodiment of the present invention, a limiting ring is provided at the top of the collar, and the limiting ring axially restricts the sliding of the insert plate.

[0016] This utility model provides a thermocouple with a protective sleeve, featuring an auxiliary installation mechanism at the connection point between the protective sleeve and the probe. During installation, the auxiliary mechanism aligns the positioning block on the probe with the positioning groove, allowing it to enter the receiving cavity. Subsequently, rotating the probe misaligns the positioning block with the groove, embedding it into the receiving cavity, thus completing the instantaneous installation and connection between the protective sleeve fixing ring and the probe. Disassembly is performed by simply reversing the operation. Compared to traditional installation methods, this utility model eliminates the need for professional personnel, shortening installation time and improving efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a thermocouple with a protective sleeve in one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the connection position between the protective sleeve and the probe in one embodiment of the thermocouple with protective sleeve of this utility model.

[0020] Figure 3 This is a schematic diagram of the structure of a thermocouple with a protective sleeve according to this utility model, in one embodiment of which the auxiliary installation mechanism is located on a fixing ring;

[0021] Figure 4 This is a partial structural diagram of the auxiliary installation mechanism of the thermocouple with protective sleeve of this utility model located on the probe rod in one embodiment.

[0022] Component designation explanation:

[0023] 1. Junction box; 2. Probe rod; 3. Protective sleeve; 31. Fixing ring; 4. Auxiliary installation mechanism; 41. Positioning groove; 42. Circular limiting barrier; 43. Positioning block; 44. Stop block; 45. Limiting plate; 51. Arc groove; 52. Sealing strip; 61. Collar ring; 62. Guide rod; 63. Insert plate; 7. Limiting ring. Detailed Implementation

[0024] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0025] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0026] It should be noted that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0027] A thermocouple is a commonly used temperature-sensing element in temperature measuring instruments. It directly measures temperature and converts the temperature signal into a thermoelectric electromotive force (EMF) signal, which is then converted into the temperature of the measured medium by an electrical instrument. The basic principle of thermocouple temperature measurement is that when two conductors of different materials form a closed circuit, a current will flow through the circuit when there is a temperature difference between the two ends, and an EMF will exist at the two ends.

[0028] Please see Figure 1 and Figure 2This utility model provides a thermocouple with a protective sleeve. The thermocouple includes a junction box 1, a probe 2, a protective sleeve 3, and an auxiliary installation mechanism 4. The probe 2 includes an insulating sleeve and a thermocouple disposed inside the insulating sleeve. The thermocouple consists of two conductors (thermoelectric wires) of different materials, which are encased in the insulating sleeve and welded together at one end to form the measuring end (hot end). The insulating sleeve insulates the two thermoelectric wires from each other, preventing short circuits and protecting the thermocouple from chemical corrosion or mechanical damage from the external environment. The insulating sleeve is typically made of ceramic or other high-temperature resistant and corrosion-resistant insulating materials. The junction box 1 is located at one end of the probe 2 and is used to connect the cold end of the thermocouple to external measuring instruments or compensating wires. The protective sleeve 3 is fitted onto the outer wall of the probe 2 to protect the thermocouple and the insulating sleeve, extending the service life of the thermocouple. Depending on the application environment, the material of the protective sleeve 3 can be one or more of stainless steel, coated stainless steel, wear-resistant coated materials, etc. To facilitate the replacement of the protective sleeve 3, this utility model provides an auxiliary installation mechanism 4 at the connection position between the protective sleeve 3 and the probe 2. The auxiliary installation mechanism 4 enables quick assembly and disassembly of the protective sleeve 3 and the probe 2, shortening the installation time and improving the installation efficiency.

[0029] Please see Figures 2 to 4 The auxiliary installation mechanism 4 includes a fixing ring 31, a positioning groove 41, a receiving cavity, and a positioning block 43. The fixing ring 31 is fixedly installed on the top of the protective sleeve 3, and the fixing method can be welding or other conventional connection methods in the art. The positioning groove 41 is located on the inner wall of the top of the fixing ring 31. The receiving cavity is located on the inner wall of the fixing ring 31 below the positioning groove 41, and the receiving cavity is used to accommodate the positioning block 43 and restrict the axial movement of the positioning block 43. The positioning block 43 is correspondingly installed on the outer wall of the probe rod 2, and as the probe rod 2 rotates, the positioning block 43 can rotate within the receiving cavity. Using the auxiliary installation mechanism 4 of this application, when installing the protective sleeve 3, first insert the probe 2 into the protective sleeve 3, and align the positioning block 43 on the probe 2 with the positioning groove 41 on the inner wall of the fixing ring 31, so that the positioning block 43 enters the receiving cavity at the bottom of the positioning groove 41. Then rotate the probe 2, and the positioning block 43 rotates smoothly in the receiving cavity with the probe 2 until the positioning block 43 is misaligned with the positioning groove 41, that is, it is limited by the positioning block 43 in the receiving cavity, thus completing the instantaneous installation of the protective sleeve 3 and the probe 2.

[0030] Please see Figure 3In one embodiment, the fixing ring 31 is a stepped, annular hollow structure. The inner diameter of the fixing ring 31 increases sequentially from top to bottom, and the top inner diameter (first inner diameter) of the fixing ring 31 matches the outer diameter of the probe rod 2. Positioning grooves 41 are provided on the top inner wall of the fixing ring 31. In this embodiment, two positioning grooves 41 are provided opposite each other on the top inner wall of the fixing ring 31, and correspondingly, two opposing positioning blocks 43 are provided on the top outer wall of the probe rod 2. The shapes of the positioning blocks 43 and the positioning grooves 41 are not limited here, as long as their shapes and sizes match. For example, if the positioning groove 41 is a rectangular groove, then the positioning block 43 is a rectangular block that matches the rectangular groove. In this embodiment, an annular limiting barrier 42 is provided on the inner wall of the fixing ring 31 at the bottom of the positioning groove 41. The annular limiting barrier 42 is arranged in a circle around the inner wall of the fixing ring 31 with a second inner diameter. The distance from the annular limiting barrier 42 to the bottom of the positioning groove 41 is at least enough to accommodate the positioning block 43. The space between the annular limiting barrier 42 and the bottom of the positioning groove 41 forms a receiving cavity. The inner walls on both sides of the bottom of the annular limiting barrier 42 and the positioning groove 41 can restrict the up and down movement of the positioning block 43. The receiving cavity between them provides space for the circumferential movement of the positioning block 43.

[0031] Please see Figure 3 and Figure 4 In one embodiment, the auxiliary installation mechanism 4 further includes a limiting device for restricting the rotation of the probe rod 2. This limiting device includes a stop block 44 and a limiting plate 45. The stop block 44 is disposed on the outer wall of the probe rod 2 and is staggered with the positioning block 43. The stop block 44 is positioned higher than the positioning block 43, and the vertical distance between them must be such that when the positioning block 43 enters the receiving cavity from the positioning groove 41, the stop block 44 is located above the positioning groove 41. The limiting plate 45 is disposed on the top wall of the fixing ring 31 on one side of the positioning groove 41 to stop the movement of the stop block 44. When the probe rod 2 rotates until the stop block 44 contacts the limiting plate 45, the probe rod 2 stops rotating, and the protective sleeve 3 is assembled with the probe rod 2. To enable the probe rod 2 to rotate forward and backward, the size of the stop block 44 is larger than the positioning groove 41. Thus, when the stop block 44 rotates above the positioning groove 41, it will not embed itself in the positioning groove 41, and therefore will not affect the reverse rotation of the probe rod 2. In this embodiment, the shape of the stop 44 is not limited and can be any regular or irregular shape, such as a cube or cuboid. Furthermore, the height of the limiting plate 45 is greater than the height of the stop 44 to prevent the stop 44 from passing over the limiting plate 45 and failing to perform its limiting function.

[0032] Please see Figure 3 and Figure 4In one embodiment, the auxiliary installation mechanism 4 includes two opposing stops 44, which are staggered with two positioning blocks 43 on the outer wall of the probe 2. The center line connecting the two stops 44 and the center line connecting the two positioning blocks 43 are perpendicular to each other. That is, the angle between each adjacent positioning block 43 and the stop 44 is 90°. During installation, simply align the symmetrically arranged positioning blocks 43 on the outer wall of the probe 2 with the two positioning slots 41 and insert them. Then rotate the probe 2 90°, and the two positioning blocks 43 will rotate smoothly inside the receiving cavity simultaneously. When the two stops 44 are above the two positioning slots 41, and one of the stops 44 contacts the limiting plate 45 on the top of the fixing ring 31, the protective sleeve 3, the fixing ring 31, and the probe 2 are instantly installed and joined. Disassembly is simply the reverse operation. Compared with traditional installation methods, no professional personnel are required, installation time is shortened, and installation efficiency is improved.

[0033] Please see Figure 3 and Figure 4 In one embodiment, the top of the fixing ring 31 is provided with an arc-shaped groove 51, which is disposed on the top wall of the fixing ring 31 on both sides of the positioning groove 41. For example, if two positioning grooves 41 are provided opposite each other on the top inner wall of the fixing ring 31, then two arc-shaped grooves 51 are symmetrically opened on the top of the fixing ring 31 with the center line connecting the two positioning grooves 41 as the axis. A sealing strip 52 is fixedly connected inside each arc-shaped groove 51. When the protective sleeve 3, the fixing ring 31 and the probe 2 are combined, the probe 2 can squeeze the sealing strip 52 to improve the sealing effect. The sealing strip 52 is made of a material with elastic properties, such as rubber, which can deform under external pressure and recover after the external force is removed. Further, the probe 2 is provided with a sealing assembly that cooperates with the arc-shaped groove 51 and the sealing strip 52. The sealing assembly includes a collar 61 and an insert plate 63. The collar 61 is fixedly disposed on the outer wall of the probe 2 on the top of the stop block 44, and the insert plate 63 is slidably connected to the collar 61 in an arc shape. In this embodiment, with the connecting line of the two stops 44 as the axis of symmetry, multiple guide rods 62 are spaced apart on the side wall of the collar 61. Two insert plates 63 are fitted onto the multiple guide rods 62 and can slide up and down along the guide rods 62. When the protective sleeve 3, the fixing ring 31 and the probe 2 are combined, the insert plate 63 will be inserted into the arc-shaped groove 51 and simultaneously squeeze the sealing strip 52. The sealing strip 52 deforms after being squeezed, and the deformation of the sealing strip 52 can seal the gap, which helps to improve the sealing effect.

[0034] Please see Figures 2 to 4When installing the protective sleeve 3, first insert the probe 2 into the protective sleeve 3 and align the positioning block 43 with the positioning groove 41 so that the positioning block 43 is inserted into the positioning groove 41 and enters the receiving cavity. Then rotate the probe 2 to adjust the two stops 44 above the two positioning grooves 41. At this time, the insert plate 63 is exactly above the arc groove 51. Under its own weight, the insert plate 63 slides down along the outer wall of the multiple guide rods 62 and finally falls into the arc groove 51 to squeeze the sealing strip 52. When the protective sleeve 3 and the fixing ring 31 need to be separated from the probe 2, the thermocouple is inverted. Under its own weight, the insert plate 63 slides in the opposite direction along the outer wall of the multiple guide rods 62 and is pulled out of the arc groove 51. Then rotate the probe 2 in the opposite direction to align the positioning block 43 with the positioning groove 41. The positioning block 43 slides out of the positioning groove 41, thus achieving the purpose of separation. To prevent the insert plate 63 from slipping off the collar 61 when it slides in the reverse direction, a limit ring 7 is fixedly connected to the top of the collar 61. The limit ring 7 stops at the top of multiple guide rods 62. When the insert plate 63 slides in the reverse direction along the guide rods 62, the limit ring 7 plays a limiting role, ensuring that the insert plate 63 remains stable during use.

[0035] It should be noted that the internal structure of the thermocouples not described in detail above can be set up according to the conventional structure in this field, and will not be elaborated here.

[0036] This utility model provides a thermocouple with a protective sleeve, featuring an auxiliary installation mechanism at the connection point between the protective sleeve and the probe. During installation, the auxiliary mechanism aligns the positioning block on the probe with the positioning groove, allowing it to enter the receiving cavity. The probe is then rotated to misalign the positioning block with the groove, embedding it into the receiving cavity. This completes the instantaneous installation and connection between the protective sleeve fixing ring and the probe. Disassembly is performed by simply reversing the operation. Compared to traditional installation methods, this utility model eliminates the need for professional personnel, shortening installation time and improving efficiency. Therefore, this utility model effectively overcomes some practical problems in existing technologies, thus possessing high utilization value and practical significance.

[0037] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A thermocouple with a protective sheath, characterized in that, include: Junction box; The probe rod has one end fixedly connected to the junction box. A protective sleeve is fitted onto the outer wall of the probe rod; An auxiliary installation mechanism is provided at the connection point between the protective sleeve and the probe rod; The auxiliary installation mechanism includes a fixing ring, a positioning groove, a receiving cavity, and a positioning block. The fixing ring is fixed to the top of the protective sleeve. The positioning groove is disposed on the inner wall of the top of the fixing ring. The receiving cavity is disposed on the inner wall of the fixing ring at the bottom of the positioning groove. The receiving cavity is used to accommodate the positioning block and restrict the axial movement of the positioning block. The positioning block is correspondingly disposed on the outer wall of the probe rod and rotates within the receiving cavity as the probe rod rotates.

2. The thermocouple with a protective sleeve according to claim 1, characterized in that, The auxiliary installation mechanism also includes a stop block and a limiting plate. The stop block and the positioning block are alternately arranged on the outer wall of the probe rod, and the stop block is located above the positioning block. The limiting plate is arranged on the top of the fixing ring and located on one side of the positioning groove. The height of the limiting plate is greater than the height of the stop block.

3. The thermocouple with a protective sleeve according to claim 2, characterized in that, The shape and size of the positioning block match the shape and size of the positioning groove, and the size of the stop block is larger than the size of the positioning groove.

4. The thermocouple with a protective sleeve according to claim 1, characterized in that, The auxiliary installation mechanism includes two positioning slots and two positioning blocks. The two positioning blocks are disposed opposite to each other on the inner wall of the top end of the fixing ring and opposite to each other on the outer wall of the probe rod.

5. The thermocouple with a protective sleeve according to claim 4, characterized in that, The auxiliary installation mechanism includes two stops, which are staggered with the two positioning blocks on the outer wall of the probe, and the center line connecting the two stops is perpendicular to the center line connecting the two positioning blocks.

6. The thermocouple with a protective sleeve according to claim 1, characterized in that, An annular limiting barrier is provided on the inner wall of the fixing ring below the positioning groove, and the receiving cavity is formed between the annular limiting barrier and the bottom of the positioning groove.

7. The thermocouple with a protective sleeve according to claim 2, characterized in that, The top of the fixing ring is provided with an arc-shaped groove, and a sealing strip is provided in the arc-shaped groove.

8. The thermocouple with a protective sleeve according to claim 7, characterized in that, The probe at the top of the stop block is provided with a collar, and an insert plate is slidably provided on the collar, the insert plate being inserted into the arc-shaped groove.

9. The thermocouple with a protective sleeve according to claim 8, characterized in that, The collar is provided with a plurality of guide rods at intervals, the guide rods extend along the axial direction of the probe rod, and the insert plate is fitted onto the plurality of guide rods.

10. The thermocouple with a protective sheath according to claim 8 or 9, characterized in that, The top of the collar is provided with a limiting ring, which axially restricts the sliding of the insert plate.

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