阅读说明：本技术 一种基于弹性支撑环的大长径比温度计 (Large length-diameter ratio thermometer based on elastic support ring ) 是由 何朝均 徐霞军 朱高斌 祁勋 马程耀 于 2020-12-25 设计创作，主要内容包括：本发明属于温度测量技术领域,具体涉及一种基于弹性支撑环的大长径比温度计,包括：保护管、温度计电气接口、温度计安装接口、弹性支撑环、铠装电缆和温度计探头；温度计探头设置于保护管的内腔中,温度计探头的自由端与保护管的内腔底端紧贴,温度计探头的另一端与铠装电缆的一端固定连接,铠装电缆的另一端与温度计电气接口的一端固定连接,温度计安装接口固定连接于保护管的开口端；弹性支撑环套设于铠装电缆上,弹性支撑环包括上套环、下套环和若干个边条,若干个边条等间隔设置于上套环和下套环之间,每个边条的两端分别与上套环和下套环固定连接,边条为可弯曲弹性结构。本发明温度计抗振动、易拆卸,能够有效应对恶劣环境。(The invention belongs to the technical field of temperature measurement, and particularly relates to a thermometer with a large length-diameter ratio based on an elastic support ring, which comprises: the thermometer comprises a protection pipe, a thermometer electrical interface, a thermometer mounting interface, an elastic support ring, an armored cable and a thermometer probe; the thermometer probe is arranged in the inner cavity of the protection tube, the free end of the thermometer probe is tightly attached to the bottom end of the inner cavity of the protection tube, the other end of the thermometer probe is fixedly connected with one end of the armored cable, the other end of the armored cable is fixedly connected with one end of the thermometer electrical interface, and the thermometer installation interface is fixedly connected to the opening end of the protection tube; on the armoured cable was located to the elastic support ring cover, the elastic support ring included the lantern ring, the lantern ring and a plurality of strake down, and a plurality of strake equidistant sets up in the lantern ring under and between the lantern ring, the both ends of every strake respectively with last lantern ring and lantern ring fixed connection down, the strake is flexible elastic construction. The thermometer provided by the invention is vibration-resistant and easy to disassemble, and can effectively cope with severe environments.)

1. A large length to diameter ratio thermometer based on an elastic support ring, said thermometer comprising: the thermometer comprises a thermometer body, a protection tube (1), a thermometer electrical interface (2), a thermometer mounting interface (3) and an elastic support ring (5), wherein the thermometer body comprises an armored cable (4) and a thermometer probe (6); the thermometer probe (6) is arranged in the inner cavity of the protection tube (1), the free end of the thermometer probe (6) is tightly attached to the bottom end of the inner cavity of the protection tube (1), the other end of the thermometer probe (6) is fixedly connected with one end of the armored cable (4), the other end of the armored cable (4) is fixedly connected with one end of the thermometer electrical interface (2), and the thermometer installation interface (3) is fixedly connected to the opening end of the protection tube (1); on armoured cable (4) was located to elasticity support ring (5) cover, elasticity support ring (5) included the lantern ring, down the lantern ring and a plurality of strake, and a plurality of strake equidistant sets up in last lantern ring and down between the lantern ring, the both ends of every strake respectively with last lantern ring and lower lantern ring fixed connection, the strake is flexible elastic construction.

2. A thermometer according to claim 1, characterized in that the elastic support ring (5) has a maximum spherical diameter larger than the diameter of the cavity of the protective tube (1) of the thermometer in the free state of the elastic support ring (5).

3. A thermometer with large length-diameter ratio based on an elastic support ring according to claim 1, characterized in that the upper ring of the elastic support ring (5) is fixedly connected with the armored cable (4), and the lower ring of the elastic support ring (5) is slidably connected with the armored cable (4).

4. A thermometer with large length-to-diameter ratio based on an elastic support ring according to claim 3, characterized in that the upper collar of the elastic support ring (5) is fixedly connected with the armored cable (4) by mechanical pressing of the thermometer mounting interface (3).

5. A thermometer with large length-to-diameter ratio based on an elastic support ring as claimed in claim 1, characterised in that the elastic support ring (5) is of ellipsoidal lantern construction.

6. A thermometer with large length-to-diameter ratio based on an elastic support ring as in claim 1, characterized in that the elastic support ring (5) is made of metal with high yield strength.

7. The thermometer with large length-diameter ratio based on the elastic support ring as claimed in claim 1, wherein the central position of the bottom end of the inner cavity of the protection tube (1) is provided with a hole groove, the thermometer probe (6) is arranged in the hole groove, and the free end of the thermometer probe (6) is tightly attached to the bottom end of the hole groove.

8. A thermometer with large length-diameter ratio based on an elastic support ring as claimed in claim 7, characterized in that the diameter of the hole groove is the same as the diameter of the thermometer probe (6), and the depth of the hole groove is larger than the length of the thermometer probe (6).

9. A thermometer with large length-to-diameter ratio based on an elastic support ring according to claim 1, characterized in that the thermometer mounting interface (3) is fixedly connected with the cavity of the protection tube (1) by screw thread.

Technical Field

The invention belongs to the technical field of temperature measurement, and particularly relates to a thermometer with a large length-diameter ratio based on an elastic support ring.

Background

In industrial applications, thermometers are widely used to measure temperature parameters of the internal medium of process system pipes, vessels, etc. However, when thermometers are used to measure the temperature of the fluid medium inside certain vessels or pipes that are relatively large and operate at relatively high pressures. In order to ensure the accuracy of temperature measurement, a thermometer with a long length needs to be inserted into the interior of the temperature measuring device effectively, the insertion depth of some thermometers can reach 0.5 meter or even more than 1 meter according to different process system conditions, and the design length of the thermometers exceeds the length of the thermometers in common industrial application. Meanwhile, in order to improve the measurement sensitivity of the thermometer, the diameter of the thermometer probe is designed to be thin, so that the conduction of the temperature is accelerated, the response time of the thermometer is shorter, and the sensitivity is higher.

In the industrial application, in order to protect the thermometer body and prevent the thermometer from directly contacting with the measured medium, a dedicated thermometer protection tube is generally designed. A protective tube is usually welded to the wall of the vessel or pipeline, a thermometer is mounted in the protective tube, the temperature of the medium is transmitted to the thermometer via the protective tube, and the temperature of the medium is measured indirectly by measuring the temperature of the wall at the end of the protective tube. In order to ensure that the measurement accuracy and the response time meet the requirements, the thermometer probe internally provided with the temperature sensing element such as a PT100 resistance wire needs to be in close contact with the end part of the protection tube, and the looseness or obvious clearance is not allowed.

In practical application, the thermometer and the protection tube thereof are long and are placed in high-temperature and high-pressure fluid, so that the protection tube has certain vibration. Along with the long-term operation of a process system, the bending deformation of the armored cable of the thermometer is easily caused by the action of the gravity of the thermometer, so that the thermometer probe cannot be attached to the wall surface of the protective tube of the thermometer, and the measurement precision and the response time are influenced. In some cases, the long-term vibration caused by the fluid scouring even leads to the breakage of the core wire in the thermometer, thereby affecting the safe and stable operation and maintenance work of the thermometer. Therefore, it is necessary to add a support ring in the middle of the thermometer to restrain the thermometer-sheathed cable so as to ensure that the thermometer does not deform after long-term operation and reduce the influence of the vibration caused by the fluid on the thermometer.

Taking a primary loop thermometer of a certain nuclear power station as an example, the length of the thermometer is more than 0.5 meter, and the diameter is less than 4 millimeters. In order to protect the thermometer, the thermometer is provided with a protective tube, and simultaneously, in order to provide the thermometer with a support and prevent the thermometer from vibrating under the influence of fluid, the thermometer is provided with a solid metal support ring in a segmented mode. When the unit is operated at full power, the temperature of the medium measured by the thermometer exceeds 300 ℃, and the pressure of the medium exceeds 15 MPa.

However, in this high-temperature and high-pressure environment, after the thermometer runs for a long time, because the diameter of the thermometer probe and the armored cable is small, the middle support ring of the thermometer is tightly attached to the inner wall of the protection tube, the assembly clearance is small, the inner diameter of the protection tube becomes small due to the deformation of the thermometer protection tube caused by long-term high pressure, the thermometer support ring is clamped, and the situation that the thermometer cannot be pulled out or the thermometer is broken occurs for many times. In addition, the position of the thermometer is a containment building, the radiation dose of the building is high, and maintenance personnel are not suitable for long-time maintenance.

Therefore, it is very important to design a thermometer with high precision and sensitivity, vibration resistance and easy disassembly, reduce the failure rate of the thermometer and improve the working efficiency of maintenance personnel.

Disclosure of Invention

The invention aims to provide a large length-diameter ratio thermometer based on an elastic support ring, which is long in length and small in diameter, supports an armored cable arranged in a protective tube through a novel elastic support ring, is vibration-resistant and easy to disassemble, can effectively cope with severe environments such as large insertion depth, high temperature, high pressure, flow-induced vibration and the like, guarantees temperature measurement precision and response time, reduces the failure rate of the thermometer, and improves the working efficiency of maintenance personnel.

The technical scheme for realizing the purpose of the invention is as follows: a large length to diameter ratio thermometer based on an elastic support ring, the thermometer comprising: the thermometer comprises a thermometer body, a protection pipe, a thermometer electrical interface, a thermometer mounting interface and an elastic support ring, wherein the thermometer body comprises an armored cable and a thermometer probe; the thermometer probe is arranged in the inner cavity of the protection tube, the free end of the thermometer probe is tightly attached to the bottom end of the inner cavity of the protection tube, the other end of the thermometer probe is fixedly connected with one end of the armored cable, the other end of the armored cable is fixedly connected with one end of the thermometer electrical interface, and the thermometer installation interface is fixedly connected to the opening end of the protection tube; on the armoured cable was located to the elastic support ring cover, the elastic support ring included the lantern ring, the lantern ring and a plurality of strake down, and a plurality of strake equidistant sets up in the lantern ring under and between the lantern ring, the both ends of every strake respectively with last lantern ring and lantern ring fixed connection down, the strake is flexible elastic construction.

Further, the elastic support ring has a maximum spherical diameter larger than a diameter of the cavity of the thermometer protection tube in a free state.

Furthermore, an upper lantern ring of the elastic support ring is fixedly connected with the armored cable, and a lower lantern ring of the elastic support ring is connected with the armored cable in a sliding mode.

Further, the upper lantern ring of the elastic support ring is fixedly connected with the armored cable through mechanical extrusion of the thermometer mounting interface.

Further, the elastic support ring is of an ellipsoidal lantern structure.

Further, the elastic support ring is made of metal with high yield strength.

Furthermore, a hole groove is formed in the center of the bottom end of the inner cavity of the protection tube, the thermometer probe is arranged in the hole groove, and the free end of the thermometer probe is tightly attached to the bottom end of the hole groove.

Further, the diameter of the hole groove is the same as that of the thermometer probe, and the depth of the hole groove is larger than the length of the thermometer probe.

Further, the thermometer mounting interface is fixedly connected with the cavity of the protection tube through threads.

The invention has the beneficial technical effects that:

1. according to the thermometer with the large length-diameter ratio based on the elastic support ring, the edge strips of the elastic support ring are arranged into the bendable elastic structure, so that the elastic support ring can be in real-time contact with the inner wall of the thermometer protection tube, a good elastic damping effect is achieved, thermometer vibration caused by fluid or mechanical operation and the like can be effectively reduced, and the failure rate of the thermometer is effectively reduced;

2. according to the thermometer with the large length-diameter ratio based on the elastic support ring, the edge strips of the elastic support ring are arranged to be bendable elastic structures, so that the elastic support ring can be in real time contact with the inner wall of the thermometer protection tube, the elastic support ring is not affected by deformation of the protection tube, the assembly gap between the sleeve and the thermometer support ring is not changed, the thermometer is easy to pull and insert, and the thermometer is convenient to disassemble and assemble;

3. according to the thermometer with the large length-diameter ratio based on the elastic support ring, the edge strips of the elastic support ring are arranged into the bendable elastic structure, so that the elastic support ring can be in real time contact with the inner wall of the thermometer protection tube, and the armored cable arranged in the protection tube is effectively supported, so that the armored cable with a small diameter can be adopted, the quality of the armored cable is favorably reduced, the vibration of the armored cable is reduced, and the thermometer is suitable for severe use environments such as high temperature, high pressure, flow-induced vibration and the like. Meanwhile, the armored cable with smaller diameter is beneficial to reducing the manufacturing difficulty and the production cost of the thermometer;

4. according to the thermometer with the large length-diameter ratio based on the elastic support ring, the armored cable arranged in the protective tube is effectively supported, and the temperature probe with the smaller diameter can be adopted, so that the measurement precision can be effectively improved, and the response time is accelerated;

5. the thermometer with the large length-diameter ratio based on the elastic support ring is simple in structure, can be designed to be long in length according to needs, can be widely applied to a process system with a large size and large thermometer insertion depth, and is wide in application range.

Drawings

FIG. 1 is a schematic structural diagram of a thermometer with a large length-diameter ratio based on an elastic support ring according to the present invention;

in the figure: 1-protecting the tube; 2-thermometer electrical interface; 3-thermometer mounting interface; 4-an armored cable; 5-an elastic support ring; 6-thermometer probe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in FIG. 1, the invention provides a thermometer with large length-diameter ratio based on an elastic support ring, which comprises: the thermometer comprises a thermometer body, a protection tube 1, a thermometer electrical interface 2, a thermometer mounting interface 3 and an elastic support ring 5; the thermometer body comprises an armored cable 4 and a thermometer probe 6.

The center of the bottom end of the inner cavity of the protection tube 1 is provided with a hole groove, the diameter of the hole groove is the same as that of the thermometer probe 6, and the depth of the hole groove is larger than the length of the thermometer probe 6. The thermometer probe 6 is arranged in the hole groove, the free end of the thermometer probe 6 is tightly attached to the bottom end of the hole groove, the other end of the thermometer probe 6 is fixedly connected with one end of the armored cable 4, the other end of the armored cable 4 is fixedly connected with one end of the thermometer electrical interface 2, and the thermometer installation interface 3 is fixedly connected to the opening end of the protection tube 1 through threads; the elastic support ring 5 is sleeved on the armored cable 4.

Elastic support ring 5 includes the lantern ring, the lower lantern ring and a plurality of strake, and the width and the length homogeneous phase of every strake set up in the lantern ring and down between the lantern ring with equidistant setting of a plurality of strake, the both ends of every strake respectively with last lantern ring and lower lantern ring fixed connection, the strake is flexible elastic construction. The elastic support ring 5 is in a free state, and the maximum spherical diameter of the elastic support ring 5 is larger than the diameter of the cavity of the thermometer protection tube 1. In particular, the elastic support ring 5 may be an ellipsoidal lantern structure made of a metal material with high yield strength.

The upper lantern ring of the elastic support ring 5 is fixedly connected to the armored cable 4 through mechanical extrusion at one end of the thermometer mounting interface 3; the lower sleeve ring of the elastic support ring 5 is not fixed, is connected to the armored cable 4 in a sliding manner, and can slide along the armored cable 4. The outer diameter of the elastic support ring 5 can be easily changed when being squeezed by external force, and the elastic support ring 5 can be ensured to be in close contact with the inner wall of the protection tube 1. Meanwhile, the elastic change of the diameter of the elastic support ring 5 makes the thermometer to be very easy to assemble and disassemble and is not influenced by the deformation of the protection pipe 1 or the diameter of the installation interface 3.

When the thermometer body is mounted, the elastic support ring 5 is pressed to change the outer diameter thereof, so that the thermometer body can smoothly pass through the protection tube 1 and the thermometer mounting port 3, and the thermometer body can be smoothly inserted into the protection tube 1. After the thermometer body is inserted into the protection tube 1, the edge strips of the elastic support ring 5 rebound and cling to the inner wall of the sleeve all the time, so that the edge strips of the elastic support ring 5 support the armored cable 4, and the armored cable 4 is prevented from deforming or sagging due to overlong length; the armored cable 4 is always positioned at the axis position of the protection tube 1, so that the effective contact of the thermometer probe 6 and the end part of the protection tube 1 is ensured, and the measuring accuracy and the response time of the thermometer are ensured. When there is pipeline vibration or fluid to erode and lead to thermometer protection tube 1 vibration, the elastic damping characteristic that elastic support ring 5 has can effectively alleviate armoured cable 4 in the radial swing of protection tube 1 to prevent that thermometer probe 6 from breaking away from the tip of protection tube 1 or producing the clearance between the two, effectively reduce the vibration to temperature measurement's influence, also greatly reduced simultaneously and led to the inside 4 heart yearn of thermometer broken string's fault probability.

Generally, the protection tube 1 is welded to the wall surface of the vessel or pipeline, and the interface form of the thermometer mounting interface 3 is determined according to the interface of the protection tube 1. In general, the thermometer attachment interface 3 is screwed to the protective tube 1 to fix the thermometer body in the protective tube 1. And the resistance value of the thermometer probe 6 is output to a processing unit of the temperature measurement circuit through the thermometer electrical interface 2, so that the temperature parameter of the process system is measured.

When dismantling the thermometer body, can directly outwards extract the thermometer body, extract the in-process through naturally extruding elasticity support ring 5, make the external diameter of elasticity support ring 5 produce the change, can freely pass through protection tube 1 and thermometer installation interface 3, the protection tube 1 can directly be extracted to the thermometer body, accomplishes the dismantlement of thermometer body.

The strake quantity of elastic support ring 5 can design the adjustment according to the diameter size of armoured cable, and the diameter is big more, and strake quantity can design more to guarantee that can both obtain effective support in 4 radial all directions of armoured cable. The elastic support ring 5 is fixed with the armored cable 4 by mechanical pressing of one end of the thermometer mounting interface 3 to ensure that the thermometer body can be smoothly pulled out and detached from the protection tube 1.

The thermometer body and the protection tube 1 in the thermometer based on the large length-diameter ratio of the elastic support ring need to be arranged in a matching way so as to ensure that the thermometer body and the protection tube have high matching performance. In certain special applications, high temperature measurement accuracy and fast response time are required, in which case the thermometer probe 6 and the armored cable 4 should be chosen with a small diameter. Meanwhile, the diameter of the hole groove at the bottom end of the protection tube 1 is matched with the diameter of the thermometer probe 6, and the assembly tolerance of the hole groove and the thermometer probe is reduced as much as possible, so that the temperature measurement precision and the response time are ensured.

The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.