A replaceable thermocouple with long service life

Abstract

The invention provides a replaceable long-life thermocouple, comprising a junction box and an insulating tube, wherein the insulating tube is arranged below the junction box, the insulating tube is provided with a flange for installing the thermocouple, the insulating tube is provided with a thermoelectrode, and also comprises a sleeve; one end of the sleeve is open, the other end is closed, and the sleeve is slid into the insulating tube from the measuring end; a first fastener is provided on the sleeve, and a second fastener is provided on the flange, and the sleeve is detachably connected to the flange through the matching fastening of the first fastener and the second fastener; the sleeve is used to replace the insulating tube to be corroded, thereby extending the service life of the thermocouple; a detection wire is provided in the tube wall of the sleeve, a threading hole is provided on the flange, and the connecting end of the detection wire passes through the threading hole and is connected to the detection instrument; when the tube wall of the sleeve is corroded, the detection wire will be exposed, and when the detection wire is corroded and broken, the detection instrument can be used to notify the staff to replace it to avoid the corrosion of the insulating tube.

Description

Technical Field

[0001] The invention relates to the field of thermocouples, and in particular to a replaceable long-life thermocouple. Background Art

[0002] Thermocouples are commonly used temperature measuring elements in temperature measuring instruments. They directly measure temperature and convert temperature signals into thermoelectric potential signals, which are then converted into the temperature of the measured medium through electrical instruments. The appearance of various thermocouples is often very different due to needs, but their basic structure is roughly the same. They are usually composed of main parts such as hot electrodes, insulating sleeve protection tubes and junction boxes, and need to be used in conjunction with display instruments, recording instruments and electronic regulators.

[0003] Thermocouples in the prior art usually only have a layer of insulating tube wrapped around the hot electrode, which has poor protection effect. During long-term use, especially when measuring the temperature of some fluid media, it is easy for the surface of the insulating tube to be corroded due to long-term impact, thereby affecting the service life of the thermocouple. Once the insulating tube is corroded, it is often necessary to replace the entire thermocouple, which is costly. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a replaceable long-life thermocouple, which mainly solves the problem in the prior art that the thermocouple insulation tube is easy to wear and has a high replacement cost after being damaged.

[0005] A replaceable long-life thermocouple comprises a junction box and an insulating tube, wherein the insulating tube is arranged below the junction box, a flange for mounting the thermocouple is arranged on the insulating tube, and a thermoelectrode is arranged inside the insulating tube, and the thermocouple is characterized in that: a sleeve is also included;

[0006] The sleeve has an open end and a closed end, and is slid into the measuring end of the insulating tube and sleeved on the insulating tube; a first clip is provided on the sleeve, and a second clip is provided on the flange, and the sleeve is detachably connected to the flange through the matching clipping of the first clip and the second clip;

[0007] A detection wire is arranged in the pipe wall of the casing, and a threading hole is opened on the flange. The connecting end of the detection wire passes through the threading hole and is connected to the detection instrument. The detection wire is used to detect the wear of the casing.

[0008] Preferably, the closed end of the sleeve abuts against the measuring end of the insulating tube.

[0009] Preferably, a plurality of reinforcement layers are provided on the inner circumferential surface of the sleeve along its axis, and each reinforcement layer includes a plurality of reinforcement members distributed circumferentially around its axis, and the reinforcement members are attached to the insulating tube.

[0010] Preferably, the reinforcement member includes a connecting rod and an elastic clamping plate, the elastic clamping plate is arranged parallel to the axis of the insulating tube, one end of the connecting rod is fixedly connected to the sleeve, and the other end is fixedly connected to the elastic clamping plate.

[0011] Preferably, the surface on which the elastic clamping plate abuts against the insulating tube is an arc surface, the center of which is located on the axis of the insulating tube.

[0012] Preferably, a guide plate is provided on the end surface of the elastic clamping plate, and the guide plate gradually inclines toward the tube wall of the sleeve along the axis of the insulating tube.

[0013] Preferably, the surface of the guide plate close to the insulating tube is a conical surface, and the axis of the conical surface is colinear with the axis of the insulating tube.

[0014] Preferably, the first fastener comprises a first buckle block; the second fastener comprises a support plate and a second buckle block, the second buckle block is arranged on the surface of the support plate close to the sleeve; the first buckle block and the second buckle block are both arc blocks with a semicircular cross-section shape.

[0015] Preferably, the detection wire is spirally coiled and arranged in the wall of the casing.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. A replaceable long-life thermocouple is provided. The device is provided with a sleeve based on the structure of an existing thermocouple. The sleeve is sleeved on an insulating tube, and the sleeve and the flange on the insulating tube are detachably connected through a snap-on structure; the sleeve is used to replace the insulating tube to be corroded so as to extend the service life of the thermocouple, and the sleeve and the thermocouple are detachably connected, which is convenient for subsequent installation and replacement; in addition, a detection wire is provided in the tube wall of the sleeve, and the detection wire can be connected to a detection instrument for the staff to monitor the corrosion of the thermocouple; when the tube wall of the sleeve is corroded, the detection wire will gradually be exposed, so that the detection wire begins to be corroded. When the detection wire is corroded and broken, the staff can be notified to replace it through abnormal detection data of the detection instrument to avoid corrosion of the insulating tube;

[0018] 2. Multiple reinforcement layers are arranged on the inner circumference of the bushing along its axis. Each reinforcement layer includes multiple reinforcement members distributed circumferentially around its axis. The reinforcement members are attached to the insulating tube, which can enhance the strength of the bushing and reduce the deformation of the bushing caused by mechanical external force during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall view of the replaceable long-life thermocouple proposed by the present invention;

[0020] Figure 2 It is a cross-sectional view of the replaceable long-life thermocouple proposed by the present invention;

[0021] Figure 3 It is a structural view of the flange in the present invention;

[0022] Figure 4 It is a structural view of the detection wire in the present invention;

[0023] Figure 5 is a structural view of a reinforcement member in the present invention;

[0024] The reference numerals are as follows:

[0025] 1. Junction box; 2. Insulating tube; 3. Flange; 31. Mounting hole; 32. Threading hole; 4. Sleeve; 5. Second buckle block; 6. First buckle block; 7. Reinforcement member; 71. Connecting rod; 72. Elastic splint; 73. Guide plate; 8. Detection wire. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, unless otherwise specified, "multiple" means two or more. The orientation or state relationship indicated by the terms "inside", "upper", "lower", etc. is based on the orientation or state relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein.

[0028] like Figure 1-5 A replaceable long-life thermocouple shown includes a junction box 1 and an insulating tube 2, wherein the insulating tube 2 is arranged below the junction box 1, a flange 3 for mounting the thermocouple is arranged on the insulating tube 2, a thermoelectrode is arranged inside the insulating tube 2, and a sleeve 4 is also included;

[0029] The sleeve 4 has an open end and a closed end, and is slid into the measuring end of the insulating tube 2 and sleeved on the insulating tube 2; a first fastener is provided on the sleeve 4, and a second fastener is provided on the flange 3. The sleeve 4 is detachably connected to the flange 3 through the cooperation of the first fastener and the second fastener;

[0030] A detection wire 8 is provided in the wall of the casing 4 , and a threading hole 32 is provided on the flange 3 . The connecting end of the detection wire 8 passes through the threading hole 32 and is connected to a detection instrument. The detection wire 8 is used to detect the wear of the casing 4 .

[0031] Thermocouples in the prior art usually only have a layer of insulating tube 2 wrapped around the hot electrode, and the protective effect is poor. During long-term use, especially when measuring the temperature of some fluid media, it is easy for the surface of the insulating tube 2 to be corroded due to long-term impact, thereby affecting the service life of the thermocouple. Once the insulating tube 2 is corroded, it is often necessary to replace the entire thermocouple, which is costly.

[0032] In view of this problem, the present embodiment provides a replaceable long-life thermocouple, which is provided with a sleeve 4 based on the structure of the existing thermocouple, the sleeve 4 is sleeved on the insulating tube 2, and the sleeve 4 and the flange 3 on the insulating tube 2 are detachably snap-connected by a snap-fit ​​structure; the sleeve 4 is used to replace the insulating tube 2 to be corroded so as to extend the service life of the thermocouple, and the sleeve 4 and the thermocouple are detachably connected to facilitate subsequent installation and replacement; in addition, a detection wire 8 is provided in the tube wall of the sleeve 4, and the detection wire 8 can be connected to a detection instrument for the staff to monitor the corrosion of the thermocouple; when the tube wall of the sleeve 4 is corroded, the detection wire 8 will gradually be exposed, so that the detection wire 8 begins to be corroded, and when the detection wire 8 is corroded and broken, the staff can be notified to replace it through abnormal detection data of the detection instrument to avoid corrosion of the insulating tube 2.

[0033] Further specific settings such as Figure 2 and Figure 3 As shown, the first fastener includes a first buckle block 6; the second fastener includes a support plate and a second buckle block 5, and the second buckle block 5 is arranged on the surface of the support plate close to the sleeve 4; in this embodiment, the first buckle block 6 and the second buckle block 5 are both arc-shaped blocks with a semicircular cross-section shape, wherein the support plate is elastic, and four groups of second buckle blocks are circumferentially arranged on the flange 3; during installation, the first buckle block 6 will first abut against and be tangent to the second buckle block 5, and then gradually squeeze the second buckle block 5 outward to cause the support plate to undergo elastic deformation, and then the second buckle block 5 is reset and buckled together with the first buckle block 6.

[0034] In addition, there are many ways to arrange the detection wire 8 in the sleeve 4. For example, it can be spirally coiled in the sleeve 4, or it can be circumferentially arranged in a wavy line around the sleeve 4. As long as it can play a role in detecting the wear of the sleeve 4, the present embodiment adopts a spiral winding arrangement. As for the detection instrument, it can be a warning light or a buzzer, etc., without specific limitation.

[0035] In this embodiment, the closed end of the sleeve 4 abuts against the measuring end of the insulating tube 2 for the purpose of heat transfer to reduce measurement errors.

[0036] In this embodiment, in order to enhance the strength of the sleeve 4, as shown in FIG. Figure 5 As shown, a plurality of reinforcement layers are provided on the inner circumferential surface of the sleeve 4 along its axis, and each reinforcement layer includes a plurality of reinforcement members 7 distributed circumferentially around its axis. The reinforcement members 7 are attached to the insulating tube 2, so that during the installation process, the deformation of the sleeve 4 caused by mechanical external force can be reduced.

[0037] Furthermore, the reinforcement 7 includes a connecting rod 71 and an elastic clamp 72, the elastic clamp 72 is arranged parallel to the axis of the insulating tube 2, one end of the connecting rod 71 is fixedly connected to the sleeve 4, and the other end is fixedly connected to the elastic clamp 72; in order to increase the contact area between the elastic clamp 72 and the insulating tube 2, the surface of the elastic clamp 72 abutting against the insulating tube 2 is an arc surface, and its center is located on the axis of the insulating tube 2; in addition, a guide plate 73 is provided on the end surface of the elastic clamp 72, and the guide plate 73 gradually inclines toward the tube wall of the sleeve 4 along the axis of the insulating tube 2, and the provided guide plate can facilitate the insertion of the sleeve 4 on the insulating tube 2; further, the surface of the guide plate 73 close to the insulating tube 2 is a conical surface, and the axis of the conical surface is collinear with the axis of the insulating tube 2.

[0038] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A replaceable long-life thermocouple, comprising a junction box (1) and an insulating tube (2), wherein the insulating tube (2) is arranged below the junction box (1), a flange (3) for mounting the thermocouple is arranged on the insulating tube (2), and a thermoelectrode is arranged inside the insulating tube (2), characterized in that: Also includes a sleeve (4); The sleeve (4) is open at one end and closed at the other end, and is slid into the measuring end of the insulating tube (2) and sleeved on the insulating tube (2); a first clamping piece is provided on the sleeve (4), and a second clamping piece is provided on the flange (3); the sleeve (4) is detachably connected to the flange (3) through the matching clamping of the first clamping piece and the second clamping piece; A detection wire (8) is provided in the wall of the casing (4), a threading hole (32) is provided on the flange (3), and a connecting end of the detection wire (8) passes through the threading hole (32) to be connected to a detection instrument, and the detection wire (8) is used to detect the wear condition of the casing (4); A plurality of reinforcement layers are arranged on the inner circumferential surface of the sleeve (4) along its axis, each reinforcement layer comprising a plurality of reinforcement members (7) distributed circumferentially around its axis, and the reinforcement members (7) are attached to the insulating tube (2); The reinforcing member (7) comprises a connecting rod (71) and an elastic clamping plate (72), wherein the elastic clamping plate (72) is arranged parallel to the axis of the insulating tube (2), one end of the connecting rod (71) is fixedly connected to the sleeve (4), and the other end is fixedly connected to the elastic clamping plate (72); The first fastener comprises a first buckle block (6); the second fastener comprises a support plate and a second buckle block (5), the second buckle block (5) being arranged on a surface of the support plate close to the sleeve (4); the first buckle block (6) and the second buckle block (5) are both arc-shaped blocks with a semicircular cross-section.

2. The replaceable long-life thermocouple according to claim 1, characterized in that: The closed end of the sleeve (4) abuts against the measuring end of the insulating tube (2).

3. The replaceable long-life thermocouple according to claim 1, characterized in that: The surface of the elastic clamping plate (72) against which the insulating tube (2) abuts is an arc surface, the center of which is located on the axis of the insulating tube (2).

4. The replaceable long-life thermocouple according to claim 1, characterized in that: A guide plate (73) is provided on the end surface of the elastic clamping plate (72), and the guide plate (73) gradually inclines toward the tube wall of the sleeve (4) along the axis of the insulating tube (2).

5. The replaceable long-life thermocouple according to claim 4, characterized in that: The surface of the guide plate (73) close to the insulating tube (2) is a conical surface, and the axis of the conical surface is colinear with the axis of the insulating tube (2).

6. The replaceable long-life thermocouple according to claim 1, characterized in that: The detection wire (8) is spirally coiled and arranged in the wall of the casing (4).

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