Thermocouple protection sleeve with high firmness

Abstract

The utility model relates to a thermocouple protective sleeve with high firmness, which comprises a nut piece and a sleeve piece, a connecting channel is formed in the nut part in a vertically-through mode and further comprises an upper connecting opening located in the nut part and a lower connecting opening located in the lower end of the nut part. The lower end of the sleeve piece is closed, and the upper end of the sleeve piece is provided with an opening; a limiting step is further arranged on the portion, located in the connecting channel, of the nut part, and in the process that the sleeve part is inserted into the nut part upwards in a matched mode, the limiting step can be in interference fit with the upper end of the sleeve part so as to prevent the sleeve part from continuing to move upwards relative to the nut part. According to the thermocouple protection sleeve, even if the sleeve part is extruded and pushed by the outside in the use process, the sleeve part cannot move relative to the nut part under the blocking action of the limiting step, so that the firmness of the thermocouple protection sleeve is effectively enhanced.

Description

Technical Field

[0001] The utility model relates to the field of thermocouple sleeves, in particular to a thermocouple protection sleeve with high firmness. Background Art

[0002] Thermocouples have become the most widely used temperature sensing elements in industrial production and scientific research. As an important component of thermocouples, the performance of the thermocouple protective sheath directly affects the long-term stability, service life and other performance indicators of the thermocouple. Especially for thermocouples working at high temperatures, the requirements for the performance of their sheaths are more stringent.

[0003] For example, the Chinese patent with patent number ZL 202320090282.3 discloses: "A gasifier temperature measuring device, including a main thermocouple, which is sleeved in a metal sleeve. The lower part of the metal sleeve passes through a fixed sleeve and is sleeved with a corundum sleeve. The upper end of the fixed sleeve is provided with a secondary internal thread sealing structure, and the lower end is a through hole. The secondary internal thread sealing structure is rotatably connected to the thread structure in the middle of the metal sleeve. The inner wall of the fixed sleeve is provided with a primary internal thread sealing structure, which is rotatably connected to the wear-resistant pipe thread structure on the outer wall of the corundum sleeve. An auxiliary thermocouple is also provided on the secondary internal thread sealing structure, and the auxiliary thermocouple extends downward through the through hole. The utility model measures the temperature of the gasification furnace through the main thermocouple, and the auxiliary thermocouple measures the degree of abrasion of the gasification furnace bricks. The abrasion change will cause the temperature of the auxiliary thermocouple to rise, and the penetration length of the main thermocouple is adjusted in time to extend the service life of the main thermocouple.

[0004] As described in the above patent, the thermocouple in the prior art may be provided with multiple layers of sleeves of different materials for the performance of the sleeve. However, no matter how many layers of sleeves are provided, the metal sleeve located at the outermost layer is indispensable. The metal protective sleeve structure of the thermocouple in the prior art is generally composed of a nut part and a sleeve part, wherein the nut part is used for the installation and connection of the thermocouple, and the sleeve part is used as the outermost layer of the entire thermocouple for protection. Because two parts are involved, during the production process of the protective sleeve, it is necessary to insert the sleeve part into the nut part and then weld it to complete the fixed connection between the two.

[0005] However, there is a problem with the existing thermocouple protection sleeves, that is, the existing nut member and the sleeve member are generally matched in a manner that a connecting channel is opened through the nut member, and then one end of the sleeve member is completely inserted into the connecting channel, and then the two are welded. However, since the connecting channels on the nut members in the existing technology are all through-set, the sleeve member can move arbitrarily in the connecting channel during the assembly process. Therefore, even after the welding is completed, once the two ends of the sleeve member are subjected to external force, the sleeve member is still easy to move relative to the nut member, resulting in the destruction of the fixed connection between the two. Therefore, the firmness of the thermocouple protection sleeves with existing structures is not high enough. Summary of the invention

[0006] In order to overcome the disadvantage that the sleeve member and the nut member of the thermocouple protection sleeve in the prior art are easily separated under the action of external force, resulting in insufficient firmness, the utility model provides a thermocouple protection sleeve with high firmness.

[0007] The utility model solves the technical problem by providing a thermocouple protection sleeve with high firmness, comprising:

[0008] A nut member has a connecting passage extending vertically therein, wherein the connecting passage further comprises an upper connecting port located on the nut member and a lower connecting port located at the lower end of the nut member;

[0009] A sleeve member, the lower end of which is closed and the upper end of which is opened;

[0010] The upper end of the sleeve member can be inserted upwardly into the nut member through the lower connecting port, and after being inserted into place, the lower connecting port is welded to the outer wall of the sleeve member to achieve a fixed connection between the nut member and the sleeve member;

[0011] The nut member is also provided with a limiting step in the connecting passage. When the sleeve member is inserted upward into the nut member, the limiting step can form an interference fit with the upper end of the sleeve member to prevent the sleeve member from continuing to move upward relative to the nut member.

[0012] The upper end of the sleeve is also provided with a circle of positioning protrusions protruding outward, and the connecting channel is provided with a circle of positioning grooves below the abutting step;

[0013] When the upper end of the sleeve member forms an interference fit with the limiting step, the positioning protrusion can be snap-fitted into the positioning groove.

[0014] Furthermore, a stop-rotation protrusion is protruding in the positioning groove, and a stop-rotation recess is provided on the positioning protrusion. When the positioning protrusion is engaged with the positioning groove, the stop-rotation protrusion can be engaged in the stop-rotation recess to prevent the positioning protrusion from rotating relative to the positioning groove, thereby preventing the sleeve member from rotating relative to the nut member.

[0015] Furthermore, a sealing sleeve is connected to the upper end of the sleeve member, and the sealing sleeve is covered on the upper end of the sleeve member. When the upper end of the sleeve member forms an interference fit with the limiting step, the sealing sleeve abuts against the limiting step.

[0016] Furthermore, the sealing sleeve is configured as a soft rubber sleeve, and a protective arc surface is provided on the inner side of the upper end of the sealing sleeve; the portion of the connecting channel located above the limiting step is connected to the inner wall of the sleeve, and the protective arc surface is located at the connection between the two.

[0017] Furthermore, a circle of reinforcing ribs is provided on the circumferential side of the upper end of the sleeve member and protrudes outwards. When the sleeve member is inserted into place relative to the nut member, the reinforcing ribs are located at the lower connecting port.

[0018] Furthermore, a circle of guiding inclined surfaces is provided at the edge of the lower connecting port, and the diameter of the guiding inclined surfaces gradually decreases upward from the opening of the lower connecting port.

[0019] Furthermore, the nut member also includes a fastening portion and a threaded portion located outside the nut member.

[0020] Assembly and fixing method of thermocouple protection sleeve in the prior art:

[0021] First, the sleeve is inserted into the nut from the lower end, and the upper end of the sleeve is flush with the upper end of the nut, and then the upper ends of the two are welded, and the lower end of the nut is welded to the side wall of the sleeve to fix the two together.

[0022] The assembly and fixing method of the utility model is:

[0023] First, align the end with the opening on the sleeve with the lower connecting port of the nut, and then insert the sleeve upward into the connecting channel until the end of the upper end of the sleeve abuts against the limiting step, and at this time the positioning protrusion is also snap-fitted into the positioning groove. Due to the action of the positioning protrusion and the positioning groove, if the sleeve is not forcibly pulled by external force, the sleeve cannot move relative to the nut. Then rotate the sleeve so that the anti-rotation protrusion in the positioning groove is snap-fitted into the anti-rotation recess on the positioning protrusion. At this time, the rotation of the sleeve relative to the nut is also inhibited; then the connected sleeve and nut can be placed in the welding equipment to weld the lower connecting port of the nut to the side wall of the sleeve, and because the reinforcing rib on the sleeve is located at the lower connecting port at this time, the welding between the sleeve and the nut can be more firm due to the bridge effect of the reinforcing rib during welding, and the sleeve will not easily move or rotate relative to the nut during the welding process, so there is no need for other tooling to limit the sleeve.

[0024] The beneficial effects of the utility model are:

[0025] 1. Due to the setting of the limiting step in the nut, when the sleeve is connected to the sleeve, the end of the sleeve will be blocked by the limiting step and cannot pass through the entire sleeve. Therefore, when the sleeve and the nut are welded and assembled to the thermocouple for use, even if the sleeve is squeezed and pushed by the outside during use, the sleeve will not move relative to the nut under the blocking effect of the limiting step, thereby effectively enhancing the firmness of the thermocouple protection sleeve;

[0026] 2. Due to the arrangement of the positioning groove and the anti-rotation convex point in the nut member, and the arrangement of the positioning convexity and the anti-rotation concave point on the sleeve member, not only can the firmness of the thermocouple protection sleeve be further enhanced, but also it can be ensured that during the process of assembling and fixing the nut member and the sleeve member, before the connection between the two is completed and before welding, the sleeve member will not easily move or rotate relative to the nut member;

[0027] 3. A sealing sleeve is provided on the opening edge of the sleeve, which can not only improve the sealing between the upper end of the sleeve and the limiting step, but also prevent the sleeve end from colliding with the connecting channel and causing mutual damage during the process of inserting the sleeve into the nut. The setting of the protective bevel on the sleeve can ensure that other components of the thermocouple will not be damaged by the protrusions at the connection between the sleeve and the nut when they are inserted into the protective sleeve.

[0028] 4. Reinforcing ribs are also provided on the circumferential side of the sleeve. When the sleeve is installed in place relative to the nut, the reinforcing ribs are located at the lower connecting port of the nut. Therefore, when welding the lower connecting port of the nut and the side wall of the sleeve, the reinforcing ribs can act as a bridge to ensure the firmness of the welding between the two, thereby further improving the overall firmness of the thermocouple protection sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional schematic diagram of a protective sleeve in the prior art

[0030] Figure 2 It is a structural schematic diagram of the utility model.

[0031] Figure 3 It is a disassembly schematic diagram of the utility model.

[0032] Figure 4 It is a cross-sectional view of the utility model.

[0033] Figure 5 yes Figure 4 A magnified schematic diagram of center A.

[0034] Figure 6 It is a structural schematic diagram of the nut member in the utility model.

[0035] Figure 7 It is a schematic diagram of the disassembly of the sleeve pipe part and the sealing sleeve in the utility model.

[0036] Numbers in the figure: 1. Nut member; 2. Connection channel; 3. Upper connection port; 4. Lower connection port; 5. Sleeve member; 6. Opening; 7. Limit step; 8. Positioning protrusion; 9. Positioning groove; 10. Anti-rotation protrusion; 11. Anti-rotation depression; 12. Sealing sleeve; 13. Protective arc surface; 14. Reinforcing rib; 15. Guide slope; 16. Fastening portion; 17. Threaded portion. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

[0039] Example

[0040] Combination Figures 2 to 7 A thermocouple protection sleeve with high firmness is shown, comprising a nut member 1 and a sleeve member 5; a connecting passage 2 is provided in the nut member 1 from top to bottom, and the connecting passage 2 also comprises an upper connecting port 3 located on the nut member 1, and a lower connecting port 4 located at the lower end of the nut member 1; the lower end of the sleeve member 5 is closed, and an opening 6 is provided at the upper end; the upper end of the sleeve member 5 can be inserted upwardly into the nut member 1 through the lower connecting port 4, and after being inserted into place, the lower connecting port 4 is welded to the outer wall of the sleeve member 5 to achieve a fixed connection between the nut member 1 and the sleeve member 5; The nut member 1 is also provided with a limiting step 7 in the connecting passage 2. When the sleeve member 5 is inserted upwardly into the nut member 1, the limiting step 7 can form an interference fit with the upper end of the sleeve member 5 to prevent the sleeve member 5 from continuing to move upward relative to the nut member 1. The upper end circumference of the sleeve member 5 is also provided with a circle of positioning protrusions 8 protruding outward, and a circle of positioning grooves 9 is provided in the connecting passage 2 below the abutting step. When the upper end of the sleeve member 5 forms an interference fit with the limiting step 7, the positioning protrusion 8 can be snap-fitted into the positioning groove 9.

[0041] Combine 6 and Figure 7 As shown, in the present embodiment, a stop-rotation protrusion 10 is also protruded in the positioning groove 9, and a stop-rotation recess 11 is provided on the positioning protrusion 8. When the positioning protrusion 8 is engaged with the positioning groove 9, the stop-rotation protrusion 10 can be engaged in the stop-rotation recess 11 to prevent the positioning protrusion 8 from rotating relative to the positioning groove 9, thereby preventing the sleeve member 5 from rotating relative to the nut member 1.

[0042] Combination Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, in this embodiment, the upper end of the sleeve member 5 is also connected to a sealing sleeve 12, and the sealing sleeve 12 is covered on the upper end of the sleeve member 5. When the upper end of the sleeve member 5 forms an interference fit with the limiting step 7, the sealing sleeve 12 abuts against the limiting step 7.

[0043] Combination Figure 5 and Figure 7 As shown, in this embodiment, the sealing sleeve 12 is configured as a soft rubber sleeve, and a protective arc surface 13 is provided on the inner side edge of the upper end of the sealing sleeve 12; the portion of the connecting channel 2 located above the limiting step 7 is connected to the inner wall of the sleeve 5, and the protective arc surface 13 is located at the connection between the two.

[0044] Combination Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, in this embodiment, a circle of reinforcing ribs 14 are protruding outward from the upper circumference of the sleeve member 5 . When the sleeve member 5 is plugged into place relative to the nut member 1 , the reinforcing ribs 14 are located at the lower connecting port 4 .

[0045] Combination Figure 5 and Figure 6 As shown, a circle of guiding slopes 15 is provided at the edge of the lower connecting port 4 in this embodiment, and the diameter of the guiding slopes 15 gradually decreases upward from the opening 6 of the lower connecting port 4 .

[0046] Combination Figure 2 , Figure 3 and Figure 6 In the present embodiment, the nut member 1 further includes a fastening portion 16 and a threaded portion 17 located outside thereof.

[0047] Reference Figure 1 The assembly and fixing method of the thermocouple protection sleeve in the prior art is shown in:

[0048] First, insert the sleeve member 5 into the nut member 1 from the lower end, and make the upper end of the sleeve member 5 flush with the upper end of the nut member 1, then weld the upper ends of the two, and weld the lower end of the nut member 1 to the side wall of the sleeve member 5, so that the two are fixed together.

[0049] The assembly and fixing method of this embodiment is as follows:

[0050] First, align one end of the sleeve member 5 with the opening 6 with the lower connection port 4 of the nut member 1, and then insert the sleeve member 5 upward into the connecting channel 2 until the end of the upper end of the sleeve member 5 abuts against the limiting step 7, and at this time, the positioning protrusion 8 is also snap-fitted into the positioning groove 9. Due to the effect of the positioning protrusion 8 and the positioning groove 9, the sleeve member 5 cannot move relative to the nut member 1 without external force to forcibly pull the sleeve member 5. Then rotate the sleeve member 5 so that the anti-rotation protrusion 10 in the positioning groove 9 is snap-fitted into the anti-rotation depression 11 on the positioning protrusion 8. At this time, the sleeve The rotation of the pipe fitting 5 relative to the nut fitting 1 is also suppressed; then the connected sleeve fitting 5 and nut fitting 1 can be placed in the welding equipment to weld the lower connecting port 4 of the nut fitting 1 to the side wall of the sleeve fitting 5, and because the reinforcing rib 14 on the sleeve fitting 5 is located at the lower connecting port 4 at this time, the reinforcing rib 14 acts as a bridge during welding, and the welding between the sleeve fitting 5 and the nut fitting 1 can be more secure. During the welding process, the sleeve fitting 5 will not easily move or rotate relative to the nut fitting 1, so there is no need for other tooling to restrict the sleeve fitting 5.

[0051] The advantage of this embodiment is that a limiting step is provided in the nut component, so that during the assembly process of the sleeve component and the nut component, the sleeve component cannot pass through the entire nut component, but will be blocked by the limiting step. Therefore, when the subsequent product is in use, due to the blocking effect of the limiting step, even if the sleeve component is pushed by a strong external force, the weld between the nut component and the sleeve component will not be easily broken, thereby effectively improving the firmness of the thermocouple protective sleeve.

[0052] The above specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A thermocouple protection sleeve with high firmness, comprising: A nut member (1) has a connecting passage (2) extending therethrough from top to bottom, wherein the connecting passage (2) further comprises an upper connecting opening (3) located on the nut member (1) and a lower connecting opening (4) located at the lower end of the nut member (1); A sleeve member (5) having a closed lower end and an opening (6) at an upper end; The upper end of the sleeve member (5) can be inserted upwardly into the nut member (1) through the lower connecting port (4), and after being inserted into place, the lower connecting port (4) and the outer wall of the sleeve member (5) are welded to achieve a fixed connection between the nut member (1) and the sleeve member (5); Features: The nut member (1) is also provided with a limiting step (7) located in the connecting passage (2). When the sleeve member (5) is inserted upward into the nut member (1), the limiting step (7) can form an interference fit with the upper end of the sleeve member (5) to prevent the sleeve member (5) from continuing to move upward relative to the nut member (1); The upper end circumference of the sleeve member (5) is also provided with a circle of positioning protrusions (8) protruding outwards, and the connecting channel (2) is provided with a circle of positioning grooves (9) below the abutting step; When the upper end of the sleeve member (5) forms an interference fit with the limiting step (7), the positioning protrusion (8) can be snap-fitted into the positioning groove (9).

2. A thermocouple protection sleeve with high firmness according to claim 1, characterized in that: The positioning groove (9) is also provided with a stop-rotation protrusion (10), and the positioning protrusion (8) is provided with a stop-rotation recess (11). When the positioning protrusion (8) is engaged with the positioning groove (9), the stop-rotation protrusion (10) can be engaged in the stop-rotation recess (11) to prevent the positioning protrusion (8) from rotating relative to the positioning groove (9), thereby preventing the sleeve member (5) from rotating relative to the nut member (1).

3. The thermocouple protection sleeve with high firmness according to claim 1, characterized in that: The upper end of the sleeve member (5) is also connected to a sealing sleeve (12), and the sealing sleeve (12) is covered on the upper end of the sleeve member (5). When the upper end of the sleeve member (5) forms an interference fit with the limiting step (7), the sealing sleeve (12) abuts against the limiting step (7).

4. A thermocouple protection sleeve with high firmness according to claim 3, characterized in that: The sealing sleeve (12) is configured as a soft rubber sleeve, and a protective arc surface (13) is provided on the inner side edge of the upper end of the sealing sleeve (12); the portion of the connecting channel (2) located above the limiting step (7) is connected to the inner wall of the sleeve member (5), and the protective arc surface (13) is located at the connection point between the two.

5. The thermocouple protection sleeve with high firmness according to claim 1, characterized in that: The upper end of the sleeve member (5) is also provided with a circle of reinforcing ribs (14) protruding outwards. When the sleeve member (5) is plugged into place relative to the nut member (1), the reinforcing ribs (14) are located at the lower connection port (4).

6. The thermocouple protection sleeve with high firmness according to claim 1, characterized in that: A circle of guiding inclined surfaces (15) is also provided at the edge of the lower connecting port (4), and the diameter of the guiding inclined surfaces (15) gradually decreases upward from the opening (6) of the lower connecting port (4).

7. The thermocouple protection sleeve with high firmness according to claim 1, characterized in that: The nut member (1) further comprises a fastening portion (16) and a threaded portion (17) located outside the nut member.

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