Thermocouple measuring head structure

Abstract

The utility model relates to the technical field of thermocouples, in particular to a thermocouple measuring head structure, which comprises a junction box, a wiring board, a first thermocouple wire, a second thermocouple wire and a protection mechanism, the protection mechanism comprises a shell, a protection tube, a mounting tube, a U-shaped plate, a fixing plate, a spring and a limiting assembly, and the spring is changed from a compressed state to an extended state by rotating the limiting assembly. And under the action of the spring, the fixing plate and the mounting rod vertically move upwards to drive the first thermocouple wire and the second thermocouple wire to return to the interior of the shell, so that the problems that the temperature measuring point of the thermocouple is exposed outside for a long time and is easy to corrode and damage, and the measuring precision and the service life are influenced are solved.

Description

Technical Field

[0001] This utility model relates to the field of thermocouple technology, and in particular to a thermocouple probe structure. Background Technology

[0002] Currently, most fast-response thermocouple temperature sensors use an exposed thermocouple wire structure, and the response speed of the temperature sensor is closely related to the diameter of the thermocouple wire. The smaller the diameter of the thermocouple wire, the faster the response speed of the temperature sensor. Ordinary welding has problems such as unstable connection and poor high temperature resistance, and thermocouple wire is not easy to connect to the junction box.

[0003] The prior art CN206540640U discloses a fast-response thermocouple that uses a step-by-step transition, gradually increasing in diameter and a special welding method. The transition weld tube is welded inside the capillary tube, and the thermocouple wire is welded inside the transition weld tube. The thermocouple wire is connected to the junction box by a step-by-step increase in diameter through the transition weld tube, capillary tube, protective tube and connector arranged coaxially from the inside to the outside. This solves the problem that the thermocouple wire is not easy to connect to the junction box.

[0004] However, in the above structure, the welding point of the two thermocouple wires, which is the temperature measuring point, is exposed to the outside for a long time and is easily corroded and damaged, which in turn affects the measurement accuracy and service life. Utility Model Content

[0005] The purpose of this invention is to provide a thermocouple probe structure that solves the problem that the temperature measuring point of a thermocouple is exposed to the outside for a long time, making it susceptible to corrosion and damage, which in turn affects the measurement accuracy and service life.

[0006] To achieve the above objectives, this utility model provides a thermocouple probe structure, including a junction box, a terminal block, a first thermocouple wire, a second thermocouple wire, and a protection mechanism. The junction box contains a slide rail, and the terminal block is disposed within the slide rail. The first and second thermocouple wires are respectively fixedly connected to the terminal block and located below the terminal block, with both wires passing through the junction box. The protection mechanism includes a housing, a protective tube, a mounting tube, a U-shaped plate, a fixing plate, a spring, and a limiting assembly. The housing is fixedly connected to the junction box and located below it, and a first sliding groove is provided on the housing. The protective tube is connected to the junction box... A fixed connection is established within the housing, and a second sliding groove is provided on the protective tube. The mounting tube is movably disposed within the protective tube. The extension ends of the first and second thermocouple wires penetrate the mounting tube and are fixedly connected to form a temperature measuring point. The temperature measuring point is located between the housing and the mounting tube. A U-shaped plate is fixedly connected to the mounting tube and is located within the first and second sliding grooves. A hole is provided on the U-shaped plate. A fixing plate is fixedly connected to the mounting tube and is located on the outer wall of the mounting tube. A spring is fixedly connected between the housing and the fixing plate.

[0007] The extension ends of the first thermocouple wire and the second thermocouple wire are fixedly connected to form a temperature measuring point, which is located between the housing and the mounting tube.

[0008] The limiting component includes a limiting plate, a fixing bolt, and a fixing nut. The limiting plate is disposed between the U-shaped plates and has holes. The fixing bolt passes through the holes in the U-shaped plates and the limiting plate, and is threadedly connected to the fixing nut.

[0009] The protective mechanism further includes a sealing cover and a rotating handle. The sealing cover is rotatably connected to the housing and located below the housing. The rotating handle is fixedly connected to the sealing cover and located below the sealing cover.

[0010] The protective mechanism further includes a fixing rod and a clamp. The fixing rod is fixedly connected to the housing and located on the inner side wall of the housing. The clamp is fixedly connected to the fixing rod and located inside the housing. The protective tube passes through the central hole of the clamp.

[0011] The outer side wall of the housing is provided with a scale in the vertical direction.

[0012] The protection mechanism further includes a flange, mounting bolts, and connecting bolts. The flange is disposed on the outer side wall of the housing, and a mounting hole is provided at the bottom of the flange. A connecting hole is provided on the outer side wall of the flange. The mounting bolts are threadedly connected to the mounting holes and are located at the bottom of the flange. The connecting bolts are threadedly connected to the connecting holes and are located on the outer side wall of the flange.

[0013] This utility model discloses a thermocouple probe structure. After using the thermocouple probe, by rotating the limiting component, the spring changes from a compressed state to an extended state. Under the action of the spring, the fixing plate and the mounting rod move vertically upward, driving the first thermocouple wire and the second thermocouple wire back into the housing. This solves the problem that the temperature measuring point of the thermocouple is exposed to the outside for a long time, which is easily corroded and damaged, thus affecting the measurement accuracy and service life. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of this utility model.

[0016] Figure 2 This is a cross-sectional view of the overall structure of the first embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram of the limiting component according to the first embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the structure of the first thermocouple wire, the second thermocouple wire, the housing, the mounting tube, the U-shaped plate, the fixing plate, the spring (in the retracted state), the limiting component, and the welding point in the first embodiment of this utility model.

[0019] Figure 5 This is a schematic diagram of the structure of the first thermocouple wire, the second thermocouple wire, the housing, the mounting tube, the U-shaped plate, the fixing plate, the spring (in the extended state), the limiting component, and the welding point in the first embodiment of this utility model.

[0020] Figure 6 This is a schematic diagram of the overall structure of the second embodiment of the present invention.

[0021] Figure 7 This is a cross-sectional view of the overall structure of the second embodiment of this utility model.

[0022] Figure 8 This is a structural schematic diagram of the fixing rod and clamp of the second embodiment of this utility model.

[0023] 101-Junction box, 102-Slide rail, 103-Terminal board, 104-First thermocouple wire, 105-Second thermocouple wire, 106-Housing, 107-Protective tube, 108-Mounting tube, 109-U-shaped plate, 110-Fixing plate, 111-Spring, 112-Limiting plate, 113-Fixing bolt, 114-Fixing nut, 115-Temperature measuring point, 116-Sealing cover, 117-Rotating handle, 201-Scale, 202-Fixing rod, 203-Clamp, 204-Flange, 205-Mounting bolt, and 206-Connecting bolt. Detailed Implementation

[0024] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0025] First Embodiment

[0026] Please see Figures 1-5 ,in Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present invention. Figure 2 This is a cross-sectional view of the overall structure of the first embodiment of this utility model. Figure 3 This is a schematic diagram of the limiting component according to the first embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the first thermocouple wire, the second thermocouple wire, the housing, the mounting tube, the U-shaped plate, the fixing plate, the spring (in the retracted state), the limiting component, and the welding point according to the first embodiment of this utility model. Figure 5 This is a schematic diagram of the structure of the first thermocouple wire, the second thermocouple wire, the housing, the mounting tube, the U-shaped plate, the fixing plate, the spring (in the extended state), the limiting component, and the welding point in the first embodiment of this utility model.

[0027] This utility model provides a thermocouple probe structure: junction box 101, slide rail 102, terminal block 103, first thermocouple wire 104, second thermocouple wire 105, and protection mechanism. The protection mechanism includes a housing 106, a protection tube 107, a mounting tube 108, a U-shaped plate 109, a fixing plate 110, a spring 111, a limiting component, a sealing cover 116, and a rotating handle 117. The limiting component includes a limiting plate 112, a fixing bolt 113, and a fixing nut 114.

[0028] In a specific implementation, the junction box 101 is provided with a slide rail 102, and the terminal block 103 is disposed in the slide rail 102. The first thermocouple wire 104 and the second thermocouple wire 105 are respectively fixedly connected to the terminal block 103 and located below the terminal block 103. The first thermocouple wire 104 and the second thermocouple wire 105 pass through the junction box 101. The temperature is measured by the first thermocouple wire 104 and the second thermocouple wire 105, and the temperature signal is converted into a thermoelectric potential signal. Then, the external electrical instrument connected to the terminal block 103 in the junction box 101 converts it into the temperature of the measured medium. When the first thermocouple wire 104 and the second thermocouple wire 105 move vertically, the terminal block 103 can slide vertically in the slide rail 102.

[0029] The housing 106 is fixedly connected to the junction box 101 and located below the junction box 101. A first groove is provided on the housing 106. The protective tube 107 is fixedly connected to the junction box 101 and located inside the housing 106. A second groove is provided on the protective tube 107. The mounting tube 108 is movably disposed inside the protective tube 107. The extension ends of the first thermocouple wire 104 and the second thermocouple wire 105 pass through the mounting tube 108. The U-shaped plate 109 is fixedly connected to the mounting tube 108 and located within the first and second grooves. Holes are provided on the U-shaped plate 109. The fixing plate 110 is fixedly connected to the mounting tube 108 and is located on the outer side wall of the mounting tube 108. The spring 111 is fixedly connected between the housing 106 and the fixing plate 110. After the temperature measurement is completed, by rotating the limiting component, the spring 111 changes from its original compressed state to an extended state. Under the action of the spring 111, the fixing plate 110 and the mounting tube 108 move vertically upward, and the first thermocouple wire 104 and the second thermocouple wire 105 passing through the mounting tube 108 return to the interior of the housing 106. This solves the problem that the temperature measuring point 115 of the thermocouple is exposed to the outside for a long time and is easily corroded and damaged, which affects the measurement accuracy and service life.

[0030] In this configuration, the extension ends of the first thermocouple wire 104 and the second thermocouple wire 105 are fixedly connected to form a temperature measuring point 115. The temperature measuring point 115 is located between the housing 106 and the mounting tube 108. The fixing plate 110 and the mounting tube 108 move vertically upward under the action of the spring 111. The temperature measuring point 115, formed by the first thermocouple wire 104 and the second thermocouple wire 105 passing through the mounting tube 108 and fixedly connected, moves vertically upward and returns to the interior of the housing 106.

[0031] The limiting plate 112 is disposed between the U-shaped plates 109, and the limiting plate 112 has holes. The fixing bolt 113 passes through the holes in the U-shaped plate 109 and the limiting plate 112 respectively, and is threadedly connected to the fixing nut 114. When limiting the spring 111, the limiting plate 112, which is located in the first and second slide grooves, slides vertically downwards first, compressing the spring 111. Then, the fixing nut 114 is rotated to separate the fixing bolt 113 and the fixing nut 114. The limiting plate 112 is no longer pressed, and it can now rotate. Rotating the limiting plate 112 causes it to press against the first sliding groove. Then, rotating the fixing bolt 113 and the fixing nut 114 again causes the U-shaped plate 109 to press and fix the limiting plate 112, thereby keeping the spring 111 in a compressed state. The temperature measuring point 115 is located outside the housing 106 to measure the temperature of the medium. In reverse operation, the temperature measuring point 115 retracts into the housing 106 to protect it.

[0032] The sealing cap 116 is rotatably connected to the housing 106 and located below the housing 106. The rotating handle 117 is fixedly connected to the sealing cap 116 and located below the sealing cap 116. After use, the temperature measuring point 115 returns to the housing 106. By rotating the rotating handle 117, the sealing cap 116 is screwed into the housing 106, further protecting the temperature measuring point 115 and preventing it from being exposed to the outside for a long time, which could easily lead to corrosion and damage, thus affecting the measurement accuracy and service life.

[0033] When using the thermocouple probe of this utility model for temperature measurement, firstly, the limiting plate 112, located in the first and second sliding grooves, slides vertically downwards. The mounting tube 108 slides within the protective tube 107, simultaneously causing the fixing plate 110, the temperature measuring point 115, the first thermocouple wire 104, the second thermocouple wire 105, and the terminal block 103 to move vertically downwards. The spring 111 is compressed. Then, the fixing nut 114 is rotated to separate the fixing bolt 113 from the fixing nut 114, and the U-shaped plate 109 no longer acts as a guide. When the limiting plate 112 is pressed, it can rotate. Rotating the limiting plate 112 causes it to press against the first sliding groove. Rotating the fixing bolt 113 and the fixing nut 114 again causes the U-shaped plate 109 to press and fix the limiting plate 112, thus keeping the spring 111 in a compressed state. The temperature measuring point 115 is located outside the housing 106 for measuring the medium's temperature. Reversing the operation, the temperature measuring point 115 retracts into the housing 106, protecting it. Rotating the rotating handle 117 closes the sealing cover 116 with the housing 106, further protecting the temperature measuring point 115. This solves the problem that the thermocouple's temperature measuring point 115, which is often exposed and easily corroded, affects measurement accuracy and service life.

[0034] Second Embodiment

[0035] Please see Figures 6-8 ,in Figure 6 This is a schematic diagram of the overall structure of the second embodiment of the present invention. Figure 7 This is a cross-sectional view of the overall structure of the second embodiment of this utility model. Figure 8 This is a structural schematic diagram of the fixing rod and clamp of the second embodiment of this utility model.

[0036] Based on the first embodiment, the thermocouple probe structure of this utility model includes a protection mechanism, which further includes a scale 201, a fixing rod 202, a clamp 203, a flange 204, mounting bolts 205, and connecting bolts 206.

[0037] The fixing rod 202 is fixedly connected to the housing 106 and located on the inner wall of the housing 106. The clamp 203 is fixedly connected to the fixing rod 202 and located inside the housing 106. The protective tube 107 passes through the clamp 203. The clamp 203 connected to the fixing rod 202 provides fixed support for the protective tube 107, preventing the temperature measuring point 115 from contacting the measured medium due to vibration, thereby affecting the measurement accuracy of the thermocouple probe.

[0038] The outer wall of the housing 106 is vertically provided with a scale 201. The scale 201 facilitates accurate installation by the installer and avoids errors caused by the insertion depth. The installation tube 108 is made of insulating material to prevent the first thermocouple wire 104 and the second thermocouple wire 105 from coming into contact and causing a short circuit.

[0039] The flange 204 is disposed on the outer side wall of the housing 106, and the bottom of the flange 204 is provided with a mounting hole. The outer side wall of the flange 204 is provided with a connecting hole. The mounting bolt 205 is threadedly connected to the mounting hole and is located at the bottom of the flange 204. The connecting bolt 206 is threadedly connected to the connecting hole and is located on the outer side wall of the flange 204. The operator fixes the thermocouple to the measured medium by using the mounting bolt 205 and the flange 204, and adjusts the insertion depth of the thermocouple by adjusting the connecting bolt 206.

[0040] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A thermocouple probe structure, comprising a junction box, a terminal block, a first thermocouple wire, and a second thermocouple wire, wherein the junction box is provided with a slide rail, the terminal block is disposed within the slide rail, the first thermocouple wire and the second thermocouple wire are respectively fixedly connected to the terminal block and located below the terminal block, and the first thermocouple wire and the second thermocouple wire respectively pass through the junction box, characterized in that, It also includes a protection mechanism, which comprises a housing, a protective tube, a mounting tube, a U-shaped plate, a fixing plate, a spring, and a limiting assembly. The housing is fixedly connected to the junction box and located below the junction box, and the housing is provided with a first sliding groove. The protective tube is fixedly connected to the junction box and located inside the housing, and the protective tube is provided with a second sliding groove. The mounting tube is movably disposed inside the protective tube. The extension ends of the first and second thermocouple wires penetrate the mounting tube and are fixedly connected to form a temperature measuring point, which is located between the housing and the mounting tube. The U-shaped plate is fixedly connected to the mounting tube and located within the first and second sliding grooves, and the U-shaped plate is provided with holes. The fixing plate is fixedly connected to the mounting tube and located on the outer wall of the mounting tube. The spring is fixedly connected between the housing and the fixing plate.

2. The thermocouple probe structure as described in claim 1, characterized in that, The limiting assembly includes a limiting plate, a fixing bolt, and a fixing nut. The limiting plate is disposed between the U-shaped plates and has holes. The fixing bolt passes through the holes in the U-shaped plates and the limiting plate, respectively, and is threadedly connected to the fixing nut.

3. The thermocouple probe structure as described in claim 1, characterized in that, The protective mechanism also includes a sealing cover and a rotating handle. The sealing cover is rotatably connected to the housing and located below the housing. The rotating handle is fixedly connected to the sealing cover and located below the sealing cover.

4. The thermocouple probe structure as described in claim 1, characterized in that, The protective mechanism also includes a fixing rod and a clamp. The fixing rod is fixedly connected to the housing and located on the inner side wall of the housing. The clamp is fixedly connected to the fixing rod and located inside the housing. The protective tube passes through the central hole of the clamp.

5. The thermocouple probe structure as described in claim 1, characterized in that, A scale is vertically provided on the outer side wall of the shell.

6. The thermocouple probe structure as described in claim 1, characterized in that, The protective mechanism further includes a flange, mounting bolts, and connecting bolts. The flange is disposed on the outer side wall of the housing, and a mounting hole is provided at the bottom of the flange. A connecting hole is provided on the outer side wall of the flange. The mounting bolts are threaded to the mounting holes and are located at the bottom of the flange. The connecting bolts are threaded to the connecting holes and are located on the outer side wall of the flange.

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