Wear-resistant thermocouple

Abstract

The utility model relates to a thermocouple field discloses a kind of wear-resistant thermocouples, including junction box, the inside fixed mounting of junction box has hot electrode, the outer wall of hot electrode is equipped with insulating sleeve, the bottom of junction box is connected with the protective sleeve being provided, and hot electrode is inside the protective sleeve, the outer wall bottom of the protective sleeve is provided with flow guide mechanism, the flow guide mechanism includes outer thread, and the outer thread is fixedly connected in the outer wall bottom sleeve of protective sleeve.In the utility model, excellent wear resistance is realized by flow guide mechanism, the flared structure of flow guide cover can increase medium contact area, reduce high-speed medium in pipeline to low speed, greatly reduce abrasive impact force, while inner wall guide medium flows along cover body outside, avoiding hot electrode measuring end;Two sides flow guide plate and the connecting rod of bottom, front and back side form protective frame, further isolate abrasive impact, effectively avoid protective sleeve rapid wear, significantly prolong the service life of thermocouple.

Description

Technical Field

[0001] This utility model relates to the field of thermocouples, and in particular to a wear-resistant thermocouple. Background Technology

[0002] In the field of industrial temperature measurement, thermocouples are widely used in boilers, metallurgical furnaces, chemical reaction vessels and other scenarios due to their advantages such as wide temperature measurement range and fast response speed.

[0003] In existing technologies, thermocouples typically consist of a junction box, thermocouples, an insulating sleeve, and a protective sleeve. The thermocouples are encapsulated within the insulating sleeve and placed within the protective sleeve. Signal transmission is achieved through the junction box. The protective sleeve is usually made of stainless steel or a common alloy to isolate the thermocouples from the high-temperature medium, preventing direct corrosion or impact to the thermocouples.

[0004] However, the existing protective sleeves have insufficient wear resistance. In scenarios such as dusty high-speed fluids and molten metals, the abrasive particles carried by the medium will directly impact the measuring end, aggravating wear and causing the thermocouple to be exposed and fail. Therefore, a wear-resistant thermocouple is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a wear-resistant thermocouple, which aims to solve the problem of insufficient wear resistance in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a wear-resistant thermocouple, including a junction box, a thermoelectrode fixedly installed inside the junction box, an insulating sleeve covering the outer wall of the thermoelectrode, a protective sleeve connected to the bottom of the junction box, and the thermoelectrode located inside the protective sleeve, and a flow guiding mechanism provided at the bottom of the outer wall of the protective sleeve.

[0007] The flow guiding mechanism includes an external thread, which is fixedly connected to the bottom of the outer wall of the protective sleeve. The protective sleeve is connected to an installation sleeve via the external thread. A flow guiding plate is fixedly connected to the bottom of the installation sleeve. There are two flow guiding plates. A flow guiding shroud is fixedly connected to the left side of the flow guiding plate located on the left side. A connecting rod is fixedly connected between the two flow guiding plates. The measuring end of the thermoelectrode is located between the two flow guiding plates.

[0008] As a further description of the above technical solution: the number of connecting rods is three, and the three connecting rods are respectively arranged on the front and rear sides and the bottom of the thermoelectrode measuring end.

[0009] As a further description of the above technical solution: the top of the mounting sleeve is provided with a positioning hole, the outer wall of the protective sleeve is fixedly fitted with a positioning plate, the top of the positioning plate is provided with a positioning pin, the positioning pin movably passes through the top of the positioning plate and slides in connection with the inner wall of the positioning hole.

[0010] As a further description of the above technical solution: a spring is sleeved on the outer wall of the positioning pin, and the two ends of the spring are fixedly connected to the top of the positioning plate and the positioning pin, respectively.

[0011] As a further description of the above technical solution: the protective sleeve is provided with a fixing mechanism, the fixing mechanism includes a flange, the flange is slidably sleeved on the outer wall of the protective sleeve, a locking screw block is fixedly connected to the top of the flange, a locking screw sleeve is slidably sleeved on the outer wall of the protective sleeve, and the inner wall of the locking screw sleeve is threadedly connected to the outer wall of the locking screw block.

[0012] As a further description of the above technical solution: the inner wall of the locking screw sleeve is inclined inward, and the inner wall of the locking screw block is provided with an anti-slip rubber strip.

[0013] As a further description of the above technical solution: the top of the flange is provided with a fixing hole, the outer wall of the locking screw sleeve is fixedly fitted with a fixing plate, the top of the fixing plate is provided with a fixing bolt, and the fixing bolt moves through the top of the fixing plate and is threadedly connected to the fixing hole.

[0014] As a further description of the above technical solution: the number of fixing holes and fixing bolts is four, and the four fixing holes are arranged around the top of the flange.

[0015] This utility model has the following beneficial effects:

[0016] 1. In this utility model, excellent wear resistance is achieved through a flow guiding mechanism. The flared structure of the flow guide can increase the contact area of ​​the medium, reduce the high speed of the medium in the pipeline to a low speed, and significantly reduce the impact force of abrasive particles. At the same time, the inner wall guides the medium to flow along the outer side of the cover, avoiding the thermocouple measuring end. The flow guide plates on both sides and the connecting rods at the bottom and front and rear sides form a protective frame, further isolating the abrasive impact, effectively avoiding rapid wear of the protective sleeve, and significantly extending the service life of the thermocouple.

[0017] 2. In this utility model, the flange in the fixing mechanism can be slidably adjusted, and the locking screw sleeve cooperates with the locking screw block inclined on the inner wall to stably lock the protective sleeve; and the protective sleeve can be rotated to adjust the direction of the flow guide shroud so that it is opposite to the direction of the medium flow, thereby maximizing the deceleration and flow avoidance effect of the flow guide shroud, avoiding direct impact of the medium on the measuring end, while adapting to different pipeline layouts, reducing installation interference, and improving the ease of operation. Attached Figure Description

[0018] Figure 1 This is a front view of a wear-resistant thermocouple proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the current guiding mechanism of a wear-resistant thermocouple proposed in this utility model;

[0020] Figure 3 This is a diagram illustrating the flow guiding mechanism of a wear-resistant thermocouple proposed in this utility model.

[0021] Figure 4 This is a diagram illustrating the fixing mechanism of a wear-resistant thermocouple proposed in this utility model.

[0022] Legend:

[0023] 1. Junction box; 2. Protective sleeve; 3. Flow guiding mechanism; 31. External thread; 32. Mounting sleeve; 33. Flow guide plate; 34. Flow guide cover; 35. Connecting rod; 36. Positioning hole; 37. Positioning plate; 38. Positioning pin; 39. Spring; 4. Fixing mechanism; 41. Flange; 42. Locking screw block; 43. Locking screw sleeve; 44. Fixing hole; 45. Fixing plate; 46. Fixing bolt; 47. Anti-slip rubber strip. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figure 1 An embodiment of this utility model is provided: a wear-resistant thermocouple, including a junction box 1, a thermoelectrode fixedly installed inside the junction box 1, an insulating sleeve covering the outer wall of the thermoelectrode, a protective sleeve 2 connected to the bottom of the junction box 1, and the thermoelectrode located inside the protective sleeve 2, and a flow guiding mechanism 3 provided at the bottom of the outer wall of the protective sleeve 2.

[0026] Reference Figure 2 - Figure 4The flow guiding mechanism 3 includes an external thread 31, which is fixedly connected to the bottom of the outer wall of the protective sleeve 2 for mounting the mounting sleeve 32 on the protective sleeve 2. The protective sleeve 2 is connected to the mounting sleeve 32 via the external thread 31, facilitating the installation and removal of the flow guiding plate 33. The bottom of the mounting sleeve 32 is fixedly connected to the flow guiding plate 33. There are two flow guiding plates 33. The left side of the left flow guiding plate 33 is fixedly connected to the left side of the left flow guiding plate 33 for guiding the measuring medium and preventing the medium from directly scouring the measuring end of the thermoelectrode. A connecting rod 35 is fixedly connected between the two flow guiding plates 33 to improve the stability of the flow guiding plates 33. The measuring end of the thermoelectrode is located between the two flow guiding plates 33. The number of connecting rods 35 is... There are three connecting rods 35, which are respectively set on the front and rear sides and bottom of the thermoelectrode measuring end to protect the bottom of the protective sleeve 2. The top of the mounting sleeve 32 is provided with a positioning hole 36 for positioning the guide shroud 34. The outer wall of the protective sleeve 2 is fixedly fitted with a positioning plate 37. The top of the positioning plate 37 is provided with a positioning pin 38, which works with the positioning hole 36 to position the guide shroud 34. The positioning pin 38 moves through the top of the positioning plate 37 and slides through the inner wall of the positioning hole 36. The outer wall of the positioning pin 38 is fitted with a spring 39. The two ends of the spring 39 are fixedly connected to the top of the positioning plate 37 and the positioning pin 38 respectively, so that the positioning pin 38 can be inserted into the positioning hole 36 more stably.

[0027] Reference Figure 1 , Figure 4 The protective sleeve 2 is equipped with a fixing mechanism 4, which includes a flange 41 for mounting the device on the measuring pipe. The flange 41 is slidably fitted onto the outer wall of the protective sleeve 2. A locking screw block 42 is fixedly connected to the top of the flange 41. A locking screw sleeve 43 is slidably fitted onto the outer wall of the protective sleeve 2, and the inner wall of the locking screw sleeve 43 is threadedly connected to the outer wall of the locking screw block 42. The flange 41 is fixed onto the outer wall of the protective sleeve 2 by the locking screw sleeve 43 and the locking screw block 42. The inner wall of the locking screw sleeve 43 is inclined inward, and the inner wall of the locking screw block 42 is provided with an anti-slip rubber strip to improve the locking effect. The friction between the screw block 42 and the protective sleeve 2 is reduced. A fixing hole 44 is provided on the top of the flange 41. A fixing plate 45 is fixedly fitted on the outer wall of the locking screw sleeve 43. A fixing bolt 46 is provided on the top of the fixing plate 45. The fixing bolt 46 moves through the top of the fixing plate 45 and is threadedly connected to the fixing hole 44 to fix the locking screw sleeve 43 and prevent the locking screw sleeve 43 from rotating relative to the locking screw block 42. There are four fixing holes 44 and four fixing bolts 46. The four fixing holes 44 are arranged around the top of the flange 41 to improve the fixing effect of the locking screw sleeve 43.

[0028] Working principle: First, install the mounting sleeve 32 at the bottom of the protective sleeve 2 via the external thread 31, and insert the positioning pin 38 into the positioning hole 36 to position and fix the mounting sleeve 32. At this time, the direction of the flow guide shroud 34 is opposite to the direction of the electrical interface of the junction box 1. Insert the protective sleeve 2 into the pipeline and connect it to the pipeline via the flange 41. After the flange 41 is connected, adjust the position of the thermoelectrode measuring end in the pipeline by sliding the protective sleeve 2 up and down. Then rotate the protective sleeve 2 so that the position of the electrical interface of the junction box 1 is the same as the direction of the medium flow in the pipeline, so that the flow guide shroud 34 is opposite to the direction of the medium flow. After adjustment, rotate the locking sleeve 43. Since the inner wall of the locking sleeve 43 is inclined inward, When the locking sleeve 43 is rotated, the locking sleeve 42 will tilt inward, thus fitting tightly against the outer wall of the protective sleeve 2. The protective sleeve 2 will be fixed by the friction between the locking sleeve 42 and the protective sleeve 2. After fixing, the locking sleeve 43 can be fixed by the fixing bolt 46. When in use, the high-speed medium in the pipeline carries abrasive particles and flows through the flow guide shroud 34 to the measuring end of the thermoelectrode. The flared structure of the flow guide shroud 34 increases the contact area of ​​the medium and reduces the speed of the high-speed medium in the pipeline to a low speed, thereby reducing the impact force of the abrasive particles. The inner wall of the flow guide shroud 34 guides the decelerated medium to flow along the outer side of the shroud, avoiding the measuring end and preventing direct scouring, thereby improving the wear resistance life of the protective sleeve 2.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wear resistant thermocouple comprising a terminal box (1), characterized in that: The junction box (1) is fixedly installed with a thermoelectric electrode. The outer wall of the thermoelectric electrode is covered with an insulating sleeve. The bottom of the junction box (1) is connected to a protective sleeve (2), and the thermoelectric electrode is inside the protective sleeve (2). The bottom of the outer wall of the protective sleeve (2) is provided with a flow guiding mechanism (3). The flow guiding mechanism (3) includes an external thread (31), which is fixedly connected to the bottom of the outer wall of the protective sleeve (2). The protective sleeve (2) is connected to an installation sleeve (32) through the external thread (31). A flow guiding plate (33) is fixedly connected to the bottom of the installation sleeve (32). There are two flow guiding plates (33). A flow guiding cover (34) is fixedly connected to the left side of the flow guiding plate (33) on the left side. A connecting rod (35) is fixedly connected between the two flow guiding plates (33). The measuring end of the thermoelectrode is located between the two flow guiding plates (33).

2. A wear resistant thermocouple as claimed in claim 1, wherein: The number of connecting rods (35) is three, and the three connecting rods (35) are respectively arranged on the front and rear sides and the bottom of the thermoelectrode measuring end.

3. The wear-resistant thermocouple according to claim 1, characterized in that: The top of the mounting sleeve (32) is provided with a positioning hole (36), and the outer wall of the protective sleeve (2) is fixedly fitted with a positioning plate (37). The top of the positioning plate (37) is provided with a positioning pin (38), which movably passes through the top of the positioning plate (37) and slides in connection with the inner wall of the positioning hole (36).

4. The wear-resistant thermocouple according to claim 3, characterized in that: A spring (39) is fitted on the outer wall of the positioning pin (38), and the two ends of the spring (39) are fixedly connected to the top of the positioning plate (37) and the positioning pin (38), respectively.

5. The wear-resistant thermocouple according to claim 1, characterized in that: The protective sleeve (2) is provided with a fixing mechanism (4), which includes a flange (41). The flange (41) is slidably sleeved on the outer wall of the protective sleeve (2). A locking screw block (42) is fixedly connected to the top of the flange (41). A locking screw sleeve (43) is slidably sleeved on the outer wall of the protective sleeve (2), and the inner wall of the locking screw sleeve (43) is threadedly connected to the outer wall of the locking screw block (42).

6. The wear-resistant thermocouple according to claim 5, characterized in that: The inner wall of the locking screw sleeve (43) is inclined inward, and the inner wall of the locking screw block (42) is provided with an anti-slip rubber strip (47).

7. The wear-resistant thermocouple according to claim 5, characterized in that: The flange (41) has a fixing hole (44) on its top. The outer wall of the locking screw sleeve (43) is fitted with a fixing plate (45). The top of the fixing plate (45) is provided with a fixing bolt (46), and the fixing bolt (46) moves through the top of the fixing plate (45) and is threadedly connected to the fixing hole (44).

8. A wear-resistant thermocouple according to claim 7, characterized in that: The number of fixing holes (44) and fixing bolts (46) is four, and the four fixing holes (44) are arranged around the top of the flange (41).

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