An improved structure of armored thermocouple

Abstract

The present invention relates to the technical field of temperature measuring elements, and specifically discloses an improved structure of an armored thermocouple, which includes a thermocouple body and a fixing device, a piston is fixed on a metal sleeve, and the fixing device includes an outer sleeve and a ball valve; one end of the outer sleeve has a bottom, and the bottom is provided with a center hole and a built-in flow channel, and the end where the bottom of the outer sleeve is located is fixedly connected to the ball valve, and the ball valve is driven by an elastic member to automatically reset to a cut-off state; in the combined state, the metal sleeve is fixedly connected to the outer sleeve, the piston blocks the center hole and the built-in flow channel, and the metal sleeve passes through the center hole and the ball hole. When the thermocouple body in the improved structure of the armored thermocouple fails, it can be replaced and maintained in an online pressure-carrying manner, which is safe and convenient to operate, does not need to interrupt the production process, and will not cause significant impact on actual production activities. The improved structure of the armored thermocouple is ingeniously and reasonably designed, stable in structure, high in sealing, widely applicable, easy to implement, and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of temperature measuring elements, and in particular to an improved structure of an armored thermocouple. Background Art

[0002] In the field of temperature measurement and control in industrial automation, armored thermocouples have become widely used temperature sensors in industries such as petroleum, chemical industry, metallurgy and electric power due to their advantages of high temperature resistance, corrosion resistance and rapid response. When armored thermocouples are used to measure the temperature of the medium in the equipment or pipeline, the metal sleeve is usually fixed on the installation base reserved by the equipment or pipeline by welding, flange connection or threaded connection, so that the temperature measuring end extends to the temperature measuring point in the medium. Limited by this installation and fixing method, when the armored thermocouple needs to be replaced or maintained for various reasons, the equipment needs to be suspended and the pressure needs to be released before operation. Because most industrial processes have high requirements for continuity and stability, the interruption of the production process will bring great economic losses. What is particularly serious is that when the temperature measured medium involves high temperature or contains toxic and corrosive components, before the replacement or maintenance of the armored thermocouple, it is necessary to perform pre-operations such as cooling and emptying, which not only greatly prolongs the downtime, but also significantly increases the difficulty and risk factor of operation. Even if strict safety measures are taken, the risk of leakage of harmful media is still difficult to completely avoid.

[0003] The patent with publication number CN107543628A discloses an online replaceable thermocouple for temperature measurement of a sulfur furnace. The thermocouple is extended into the sulfur furnace through a temperature measurement support tube. A first air blowing interface and a rotary valve are installed on the temperature measurement support tube. When the thermocouple needs to be replaced, the protective gas output through the first air blowing interface blocks the overflow of hydrogen sulfide gas. After the thermocouple is pulled out, the rotary valve is closed, thereby realizing online replacement of the thermocouple. However, the problem is that after the thermocouple is removed from the rear end of the temperature measuring support tube, the rotary valve cannot be closed synchronously. There must be a period in which the rear end of the temperature measuring support tube is completely open. During this period, the protective gas cannot prevent the hydrogen sulfide gas from overflowing. Therefore, this solution cannot completely avoid the problem of leakage of harmful media, especially when the pressure of the measured temperature medium is high. This defect is more significant. In addition, since the temperature measuring end of the thermocouple is immersed in the high-temperature medium for a long time, it is difficult for the surface to maintain a smooth state for a long time. In the later stage of extracting the thermocouple, it is difficult to achieve a stable sealing fit between the temperature measuring end of the thermocouple and the rear end of the temperature measuring support tube. When the sealing effect is not good, the protective gas cannot play the expected protective effect and the harmful medium is still easy to leak. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides an improved structure of an armored thermocouple. The technical concept is to adopt a combined design for the thermocouple body and the fixing device, and through structural optimization, the thermocouple body can be replaced and maintained in an online pressure-bearing manner, thereby improving operational efficiency, reducing the impact on actual industrial production, and effectively reducing operational risks and improving safety.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] An improved structure of an armored thermocouple includes a thermocouple body and a fixing device, wherein the thermocouple body includes a metal sleeve, an insulating material and a thermocouple wire, and one end of the thermocouple body is a temperature measuring end; the invention is characterized in that:

[0007] The fixing device comprises an outer sleeve and a ball valve; the lumen of the outer sleeve is cylindrical, one end of the outer sleeve is open, and the other end has a bottom, a central hole is provided at the bottom, a built-in flow channel is provided in the bottom, the lumen of the outer sleeve is connected to an auxiliary joint via the built-in flow channel, and a switch valve is installed on the auxiliary joint; the ball valve is provided with a first joint and a second joint, a ball is provided in the ball valve and a ball hole is provided on the ball, a screw component is fixedly connected to the ball, and an elastic member for driving the ball valve to automatically reset to a cut-off state is connected to the screw component; the first joint is sealed and fixedly connected to the end of the outer sleeve where the bottom is located;

[0008] A piston is fixed on the metal sleeve and can be slidably matched with the lumen of the outer sleeve in a sealing manner. A fastening mechanism is provided between the metal sleeve and the outer sleeve for fixedly connecting the two.

[0009] In the combined state, the metal sleeve and the outer sleeve are fixedly connected via a fastening mechanism, the piston blocks the center hole and the built-in flow channel, the metal sleeve passes through the center hole and the ball hole, and the temperature measuring end extends out from the second joint; when the thermocouple body and the fixing device are separated, the piston always maintains a sealed matching state with the outer sleeve before the temperature measuring end is moved out of the ball hole.

[0010] In a preferred embodiment, the fastening mechanism includes a truncated cone portion fixed to the metal sleeve, a locking cap provided on the metal sleeve, and a second external threaded portion opened outside the end of the outer sleeve opening. When the thermocouple body and the fixing device are in a combined state, the truncated cone portion abuts against the end of the outer sleeve opening and blocks the port, and the locking cap is threadedly connected to the second external threaded portion to lock and fix the truncated cone portion to the outer sleeve.

[0011] Furthermore, a gasket is fixed on the truncated cone portion to improve the sealing performance between the truncated cone portion and the end portion of the outer sleeve.

[0012] In a preferred embodiment, a threaded joint is provided at one end of the outer sleeve where the bottom is located, and the threaded joint is threadedly matched with the first joint; and the second joint is provided with threads or fixed with a flange.

[0013] In a preferred embodiment, the screwing component is composed of a handle and a valve stem, one end of the valve stem is fixedly connected to the ball, and the other end extends to the outside of the valve body and is fixedly connected to the handle; the elastic member is a torsion spring, which is sleeved on the outside of the valve stem, one end is connected to the valve body, and the other end is connected to the handle.

[0014] In a preferred embodiment, an elastic bushing is fixed in the ball hole of the ball;

[0015] Furthermore, the inner diameter surface of the elastic bushing is a rough surface.

[0016] In a preferred embodiment, the metal sleeve is provided with a thickened section, the piston is fixed on the thickened section, and the fastening mechanism is arranged between the outer sleeve and the thickened section of the metal sleeve;

[0017] Furthermore, the thickened section is formed by fixing a reinforcing tube outside the metal sleeve.

[0018] Compared with the prior art, the improved structure of the armored thermocouple in the present invention has the following beneficial technical effects:

[0019] The fixing device and the thermocouple body in the improved structure of this armored thermocouple adopt a combined design. The fixing device can work stably for a long time and is not easy to be damaged. It can provide stable support and protection for the thermocouple body. Although the thermocouple body is easy to damage and requires regular maintenance, it can be replaced and maintained online with pressure, and the risk of medium leakage caused by improper operation can be avoided. The operation is safe and convenient because there is no need to interrupt the production process, nor is there any need to cool down or empty the measured temperature medium. It is fast and efficient and will not have a significant impact on actual production activities. The design of the improved structure of this armored thermocouple is ingenious and reasonable. The structure is stable during installation and use, the sealing is high, the applicability is wide, it is easy to implement, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0021] Figure 1 It is a schematic diagram of the overall structure of the improved structure of the armored thermocouple.

[0022] Figure 2 This is a schematic diagram of the structure of the improved structure of the armored thermocouple after partial sectioning.

[0023] Figure 3 It is a schematic diagram of the structure of the thermocouple body.

[0024] Figure 4 It is a schematic diagram of the structure of the outer sleeve part.

[0025] Figure 5 It is a structural diagram of a ball valve.

[0026] Figure 6 It is a schematic diagram of the matching structure of the outer sleeve, ball valve and metal sleeve in the assembled state.

[0027] Figure 7 This is the installation diagram of the improved structure of the armored thermocouple.

[0028] Figure 8 This is a schematic diagram of the coordination status of the thermocouple body, the fixing device and the gas source device before the ball valve is closed.

[0029] Fig. 9 This is a schematic diagram of the coordination status of the thermocouple body, the fixing device and the gas source device after the ball valve is closed.

[0030] Fig.10 This is a schematic diagram of the matching status of the thermocouple body and the fixing device before the ball valve is closed.

[0031] Fig.11 It is a schematic diagram of the matching state of the thermocouple body and the fixing device after the ball valve is closed.

[0032] Fig.12 It is a schematic structural diagram of a fastening mechanism in another embodiment.

[0033] In the figure: 1, junction box, 2, outer sleeve, 201, threaded joint, 202, bottom, 203, built-in flow channel, 204, center hole, 205, first internal threaded portion, 206, second external threaded portion, 3, screwing component, 301, handle, 302 valve stem, 4, metal sleeve, 401, first external threaded portion, 402, thickened section, 5, temperature measuring end, 6, ball valve, 601, second joint, 602, first joint, 7, auxiliary joint, 8, switch valve, 9, piston, 10, torsion spring, 11, sphere, 111, ball hole, 12, elastic bushing, 13, pipeline, 131, mounting base, 14, air source device, 15, locking cap, 16, frustum, 17, gasket. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment 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.

[0035] This embodiment shows a specific construction of the improved structure of the armored thermocouple, which includes a thermocouple body and a fixing device for mounting the thermocouple body on equipment or pipelines. The thermocouple body and the fixing device are of combined design and can be combined and separated as needed.

[0036] Among them, see Figure 2 , Figure 3 As shown, the thermocouple body includes a metal sleeve 4, an insulating material and a thermocouple wire. One end of the thermocouple body is a temperature measuring end 5, and the other end is fixed with a wiring terminal. In order to improve the stability and reliability of the wiring point, a wiring box 1 is usually provided outside the wiring terminal to protect it. The above structures together constitute a thermocouple assembly widely used in the current industrial temperature measurement field. As a mature existing technology, the working principle will not be repeated.

[0037] Among them, see Figure 1 , Figure 2 , Figure 4-Figure 6As shown, the fixing device includes an outer sleeve 2 and a ball valve 6; the lumen of the outer sleeve 2 is cylindrical, one end of the outer sleeve 2 is open, and the other end has a bottom 202, the bottom 202 is provided with a central hole 204 that passes through the bottom 202, and in addition, a built-in flow channel 203 is provided in the bottom 202, the lumen of the outer sleeve 2 is connected to an auxiliary joint 7 through the built-in flow channel 203, and the auxiliary joint 7 is installed with a switch valve 8 for adjusting its on-off state; the ball valve 6 is a linear ball valve in the prior art, that is, the ball valve 6 has a first joint 602 and a second joint 601 distributed at both ends of the valve body, and the axes of the first joint 602 and the second joint 601 coincide, the ball valve 6 is provided with a ball 11, and the ball 11 is provided with a ball hole 111, and the ball 11 is fixedly connected with a screw Component 3, the ball 11 can be driven to rotate by the screwing component 3 to adjust the on-off state of the ball valve 6. The screwing component 3 is connected to an elastic member, which is used to drive the screwing component 3 to rotate to the initial position so that the ball valve 6 can automatically reset to the off state; the first joint 602 is sealed and fixedly connected to the end where the bottom 202 of the outer sleeve 2 is located, thereby, the first joint 602 is connected to the tube cavity of the outer sleeve 2 through the center hole 204; the second joint 601 is used as a mounting joint, which is used to be sealed and fixedly connected to the mounting base reserved on the equipment or pipeline, thereby providing support for the entire fixing device; when the ball valve 6 is at the maximum opening, the center lines of the tube cavity of the outer sleeve 2, the center hole 204, the first joint 602, the second joint 601 and the ball hole 111 coincide.

[0038] Among them, see Figure 2 , Figure 3 As shown, a piston 9 is fixed on the metal sleeve 4 and can slide and seal with the lumen of the outer sleeve 2, and a fastening mechanism for fixedly connecting the metal sleeve 4 and the outer sleeve 2 is provided between the metal sleeve 4 and the outer sleeve 2.

[0039] See also Figure 1 , Figure 2 and Figure 6 As shown, when the thermocouple body and the fixing device are in the combined state, the metal sleeve 4 is fixedly connected to the outer sleeve 2 via a fastening mechanism, the piston 9 blocks the center hole 204 and the built-in flow channel 203, and the metal sleeve 4 passes through the center hole 204 and the ball hole 111, so that the temperature measuring end 5 extends from the second joint 601 so as to extend to a predetermined temperature measuring point; when the thermocouple body and the fixing device are separated, during the process of the metal sleeve 4 moving outward from the outer sleeve 2, before the temperature measuring end 5 moves out of the ball hole 111, the piston 9 always maintains a sealed fit with the outer sleeve 2.

[0040] See also Figure 7As shown, after the thermocouple body, the fixing device and the mounting base 131 in the improved structure of the armored thermocouple are combined and fixedly connected, the whole has good sealing performance, so it is extremely suitable for measuring the temperature of high-pressure liquid or gas inside the equipment or pipeline 13. In actual application, the fixing device is installed and fixed on the mounting base 131 reserved on the equipment or pipeline 13 through the second joint 601, the thermocouple body and the fixing device are combined and tightly connected, and the temperature measuring end 5 extends into the predetermined temperature measuring point in the medium to be measured through the mounting base 131. When replacing or maintaining the thermocouple body, there is no need to suspend the operation of the equipment and release the pressure. According to the different characteristics of the medium to be measured, different methods can be used for pressure operation. The specific methods are:

[0041] 1. When the temperature measured medium is a liquid or gas with high temperature or containing toxic or corrosive components.

[0042] When disassembling the thermocouple body, first refer to Figure 8 As shown, adjust the switch valve 8 to the open state, connect the auxiliary joint 7 to the gas source device 14 that can output the protective gas, ensure that the built-in flow channel 203 maintains a constant pressure, and the protective gas can be selected from air, nitrogen or inert gas according to actual conditions; adjust the state of the fastening mechanism so that the thermocouple body and the fixing device can be separated, and use external force to drive the thermocouple body to slowly move to the outside of the outer sleeve 2. As the thermocouple body moves, the protective gas enters the outer sleeve 2 through the auxiliary joint 7 and the built-in flow channel 203 to fill the space and drive the temperature measured medium in the ball valve 6 to reflux; refer to Fig. 9 As shown, after the temperature measuring end 5 of the thermocouple body is moved out of the ball hole, the ball valve 6 will automatically reset to the cut-off state under the drive of the elastic member, and the temperature measured medium will not be able to flow outward through the ball valve 6; finally, the air source device 14 is stopped, and the thermocouple body is continued to be driven outward, so that the thermocouple body can be completely removed.

[0043] During the above operation, the measured temperature medium will not leak, which can ensure the personal safety of the operator and avoid pollution to the outside world, which is safe and reliable. After replacing or maintaining the removed thermocouple body, the installation of the thermocouple body can be completed by reverse operation.

[0044] 2. When the temperature measured medium is harmless ordinary liquid or gas.

[0045] When disassembling the thermocouple body, first refer to Fig.10As shown, the switch valve 8 is adjusted to the closed state, and the state of the fastening mechanism is adjusted so that the thermocouple body and the fixing device can be separated. The thermocouple body is driven by external force to slowly move to the outside of the outer sleeve 2. As the thermocouple body moves, a small amount of the temperature-measured medium is driven by pressure to enter the tube cavity of the outer sleeve 2 through the ball valve 6 and the center hole 204. However, since the piston 9 always maintains a sealed fit with the outer sleeve 2 and the auxiliary joint 7 is in a closed state, the temperature-measured medium in the outer sleeve 2 will not overflow. Fig.11 As shown, after the temperature measuring end 5 is removed from the ball hole 111, the ball valve 6 will automatically reset to the cut-off state under the drive of the elastic member, and the temperature measured medium can no longer flow into the outer sleeve 2; finally, the switch valve 8 is adjusted to the open state to balance the pressure inside the outer sleeve 2 with the external pressure, thereby continuing to drive the thermocouple body to move outward until the thermocouple body is completely removed.

[0046] During the above operation, only a small amount of harmless temperature-measured medium flows into the outer sleeve in a controllable manner, which will not hinder the actual operation. According to the actual situation, the temperature-measured medium inside the outer sleeve can be collected and processed with the help of the open port and auxiliary joint of the outer sleeve, and the inside of the outer sleeve can be further cleaned. After replacing or maintaining the thermocouple body, the installation of the thermocouple body can be completed by reverse operation.

[0047] In the improved structure of the armored thermocouple, the fixture is a simple mechanical component. During the implementation process, it is made of corresponding materials according to the actual working scene to achieve good performance in strength, corrosion resistance, oxidation resistance, etc., so that it can work stably for a long time and is not easy to be damaged. It can provide stable support and protection for the thermocouple body. As the front-end component of the temperature measurement system, the thermocouple body is easy to damage and requires regular maintenance. However, the thermocouple body and the fixture adopt a combined design, which can be replaced and maintained online under pressure without interrupting the production process or cooling or emptying the measured medium. It is fast and efficient and will not have a significant impact on actual production activities.

[0048] See also Figure 2 , Figure 7 As shown, in the improved structure of the armored thermocouple, when the thermocouple body and the fixing device are in the combined state, the outer sleeve 2 and the ball valve 6 can jointly provide support and fixation for the thermocouple body, so that the installation of the thermocouple body is more stable; the piston 9 can block the central hole 204 and the built-in flow channel 203 opened at the bottom, and at the same time, the piston 9 also seals with the side wall of the tube cavity of the outer sleeve 2, thereby achieving a double sealing effect, greatly improving the sealing of the overall structure, so that the improved structure of the armored thermocouple has good working stability.

[0049] See also Fig. 9 , Fig.11 As shown, in the improved structure of the armored thermocouple, the ball valve 6 adopts a self-resetting design. When the thermocouple body is disassembled, the ball valve 6 automatically resets to the cut-off state after the temperature measuring end 5 is separated from the ball hole, thereby avoiding the risk of leakage of the temperature measured medium due to improper operation and significantly improving the safety and convenience of operation.

[0050] The improved structure of this armored thermocouple fully considers the diversity of different industrial application scenarios. According to the different characteristics of the temperature measured medium, different operation methods can be used to complete replacement and maintenance. It can realize online pressure operation while ensuring efficiency and safety, showing high applicability and has a wide range of application scenarios.

[0051] In the improved structure of the armored thermocouple, the thermocouple body, the outer sleeve and the ball valve are core components. These components are based on the relevant product structure in the prior art and can be obtained through relatively simple structural improvements, making the improved structure of the armored thermocouple easy to implement and low-cost.

[0052] Specifically, Figure 4-Figure 6 As shown, a threaded joint 201 is provided at one end of the bottom 202 of the outer sleeve 2, and the threaded joint 201 is threadedly matched with the first joint 602 of the ball valve 6; the second joint 601 of the ball valve 6 is provided with threads or fixed with a flange, which is intended to adapt to the mounting base reserved on the equipment or pipeline.

[0053] Specifically, Figure 4 As shown, the auxiliary joint 7 is located on one side of the outer sleeve 2, and the two can be fixedly connected by welding, threaded connection, etc., or can be integrally formed.

[0054] Specifically, Figure 5 , Figure 6 As shown, the screw component 3 is composed of a handle 301 and a valve stem 302, one end of the valve stem 302 is fixedly connected to the ball 11, and the other end extends to the outside of the valve body and is fixedly connected to the handle 301, thereby, the on-off state of the ball valve 6 can be adjusted by manually rotating the handle 301; the elastic member is a torsion spring 10, which is sleeved on the outside of the valve stem 302, one end of which is connected to the valve body of the ball valve 6, and the other end is connected to the handle 301.

[0055] Preferably, Figure 5 , Figure 6 As shown, an elastic bushing 12 is fixed in the ball hole 111 of the ball 11, so that when the thermocouple body and the fixing device are in a combined state, the elastic bushing 12 can be in more balanced contact with the metal sleeve 4, providing a more stable support for the metal sleeve 4. At the same time, when the thermocouple body moves relative to the fixing device, the setting of the elastic bushing 12 can prevent the ball 11 from causing damage to the outer wall of the metal sleeve 4;

[0056] Furthermore, the inner diameter surface of the elastic bushing is a rough surface, so when the thermocouple body is driven to reciprocate within a certain range, the elastic bushing can repeatedly rub the outer wall of the temperature measuring end through the rough inner diameter surface to achieve a cleaning effect. Based on the design characteristics of the improved structure of the armored thermocouple, no medium leakage will occur during the above operation. Usually, during the operation of the thermocouple body, dust, oxides or other contaminants are easily attached to the temperature measuring end, which affects the thermal conductivity of the temperature measuring end and reduces the temperature measurement accuracy. When faced with this situation, the above method can be used to regularly clean and maintain the temperature measuring end of the thermocouple body to improve the temperature measurement accuracy. This operation method is convenient, fast and highly safe.

[0057] Preferably, see Figure 2 , Figure 3 As shown, the metal sleeve 4 is provided with a thickened section 402. In combination with the current manufacturing process of the existing armored thermocouple, the thickened section 402 is formed by fixing a reinforcing tube on the outer surface of the metal sleeve 4; the piston 9 is fixed on the thickened section 402, and the fastening mechanism is arranged between the outer sleeve 2 and the thickened section 402 of the metal sleeve 4; thereby, the thermocouple body as a whole has better strength, and the metal sleeve 4 can adopt a thinner design so that it is easier to cooperate with the ball hole of the ball 11.

[0058] In the improved structure of the armored thermocouple, the fastening mechanism is arranged between the metal sleeve and the outer sleeve, and is intended to fix the thermocouple body and the fixing device. Based on this setting intention, the fastening mechanism has a variety of implementation methods, such as Figure 2 , Figure 3 , Figure 4 As shown, the fastening mechanism may be composed of a first internal threaded portion 205 opened in the port of the outer sleeve 2 and a first external threaded portion 401 fixed on the metal sleeve 4, wherein the first external threaded portion 401 is threadedly matched with the first internal threaded portion 205; in addition, a more preferred manner is:

[0059] See also Fig.12As shown, the fastening mechanism includes a truncated cone portion 16 fixed on the metal sleeve 4, a locking cap 15 provided on the metal sleeve 4, and a second external threaded portion 206 opened on the outer side of the end of the outer sleeve 2 opening. When the thermocouple body and the fixing device are in the combined state, the truncated cone portion 16 abuts against the end of the outer sleeve 2 opening and blocks the port, and the locking cap 15 is threadedly connected with the second external threaded portion 206, so that the truncated cone portion 16 and the outer sleeve 2 are locked and fixed together; therefore, when the thermocouple body and the fixing device are combined and separated, there is no need to drive the two to rotate relative to each other as a whole, and only the locking cap 15 needs to be screwed to adjust the state of the fastening mechanism, which makes the operation more convenient on the one hand, and can avoid the adverse effect of the relative rotation of the thermocouple body and the fixing device on the matching effect on the other hand;

[0060] Furthermore, if Fig.12 As shown, a gasket 17 is fixed on the truncated cone portion 16 for improving the sealing performance with the end of the outer sleeve 2. Thus, the truncated cone portion 16 and the gasket 17 can well seal the open port of the outer sleeve 2, further improving the stability of the improved structure of the armored thermocouple in actual work.

[0061] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0063] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. An improved structure of an armored thermocouple, comprising a thermocouple body and a fixing device, wherein the thermocouple body comprises a metal sleeve, an insulating material and a thermocouple wire, and one end of the thermocouple body is a temperature measuring end; wherein: The fixing device comprises an outer sleeve and a ball valve; the lumen of the outer sleeve is cylindrical, one end of the outer sleeve is open, and the other end has a bottom, a central hole is provided at the bottom, a built-in flow channel is provided in the bottom, the lumen of the outer sleeve is connected to an auxiliary joint via the built-in flow channel, and a switch valve is installed on the auxiliary joint; the ball valve is provided with a first joint and a second joint, a ball is provided in the ball valve and a ball hole is provided on the ball, a screw component is fixedly connected to the ball, and an elastic member for driving the ball valve to automatically reset to a cut-off state is connected to the screw component; the first joint is sealed and fixedly connected to the end of the outer sleeve where the bottom is located; A piston is fixed on the metal sleeve and can be slidably matched with the lumen of the outer sleeve in a sealing manner. A fastening mechanism is provided between the metal sleeve and the outer sleeve for fixedly connecting the two. In the combined state, the metal sleeve and the outer sleeve are fixedly connected via a fastening mechanism, the piston blocks the center hole and the built-in flow channel, the metal sleeve passes through the center hole and the ball hole, and the temperature measuring end extends out from the second joint; when the thermocouple body and the fixing device are separated, the piston always maintains a sealed matching state with the outer sleeve before the temperature measuring end is moved out of the ball hole.

2. The improved structure of the armored thermocouple according to claim 1 is characterized in that: The fastening mechanism includes a truncated cone portion fixed on the metal sleeve, a locking cap arranged on the metal sleeve, and a second external threaded portion opened on the outside of the end of the outer sleeve opening. When the thermocouple body and the fixing device are in a combined state, the truncated cone portion abuts against the end of the outer sleeve opening and blocks the port, and the locking cap is threadedly connected to the second external threaded portion to lock and fix the truncated cone portion and the outer sleeve.

3. The improved structure of the armored thermocouple according to claim 2 is characterized in that: A gasket for improving the sealing performance between the truncated cone portion and the end portion of the outer sleeve is fixed on the truncated cone portion.

4. The improved structure of the armored thermocouple according to claim 1 is characterized in that: A threaded joint is provided at one end of the outer sleeve where the bottom is located, and the threaded joint is threadably matched with the first joint; the second joint is provided with threads or is fixed with a flange.

5. The improved structure of the armored thermocouple according to claim 1 is characterized in that: The screwing component is composed of a handle and a valve stem, one end of the valve stem is fixedly connected to the ball, and the other end extends to the outside of the valve body and is fixedly connected to the handle; the elastic member is a torsion spring, which is sleeved on the outside of the valve stem, one end is connected to the valve body, and the other end is connected to the handle.

6. The improved structure of the armored thermocouple according to claim 1 is characterized in that: An elastic bushing is fixed in the ball hole of the sphere.

7. The improved structure of the armored thermocouple according to claim 6 is characterized in that: The inner diameter surface of the elastic bushing is a rough surface.

8. The improved structure of the armored thermocouple according to claim 1 is characterized in that: The metal sleeve is provided with a thickened section, the piston is fixed on the thickened section, and the fastening mechanism is arranged between the outer sleeve and the thickened section of the metal sleeve.

9. The improved structure of the armored thermocouple according to claim 8 is characterized in that: The thickened section is formed by fixing a reinforcing tube outside the metal sleeve.

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