Bolt inner hole heating sensor with temperature measuring function

Abstract

The utility model provides a bolt inner hole heating inductor with a temperature measuring function, which is formed by winding a hollow copper pipe, is internally provided with a magnetizer magnetic core, has a magnetism gathering function, gathers a magnetic field of the inductor in a magnetizer, diverges the magnetic field from two ends of the magnetizer, and gathers the magnetic field on the inner wall of a bolt or a tubular workpiece. In the heating process, water is introduced into the copper pipe to cool the inductor, so that the temperature of the inductor is low in the heating process. The outer layer of the inductor adopts the high-temperature-resistant insulating layer, so that the inductor is not easy to damage even if the inductor is heated to a very high temperature. Meanwhile, a layer of multi-circle spiral steel wire is wound on the periphery of the inductor, when the inductor is used, the inductor is inevitably rubbed with the inner wall of the bolt, the steel wire on the outer side of the inductor can isolate an inductor body from being in contact with the inner wall of the bolt, the inductor is prevented from being abraded, and the service life of the inductor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a bolt inner hole heating sensor with temperature measurement function. Background Art

[0002] The conventional heating method is to use a resistance heating rod for heating. The resistance heating rod uses a resistance wire to generate heat. After heating, it is inserted into the inner hole of the bolt and conducts heat to the bolt through radiation to heat the bolt. Due to the limitation of the melting point of the resistance wire, the temperature of the resistance heating rod cannot be raised to a very high level, which limits the heating power, the heating speed is relatively slow, the heating time is long, and there are problems such as the resistance wire is easy to burn out, not durable, and unable to monitor the temperature of the inner wall of the bolt.

[0003] The resistance heating rod works at high temperature for a long time, which is easy to oxidize and burn out, and has a limited service life. The temperature of the resistance heating rod itself is high, and it is impossible to arrange a temperature sensor, so the actual temperature of the inner wall of the bolt cannot be measured, and the heating temperature cannot be effectively controlled. Utility Model Content

[0004] The purpose of the utility model is to improve the heating efficiency and the service life of the heating device when heating the bolt, and to detect the temperature of the bolt when it is heated.

[0005] The technical solution of the utility model is to provide a bolt inner hole heating inductor with temperature measurement, wherein the two ends of the bolt inner hole heating inductor are a heating end and a power-on end; the heating end of the bolt inner hole heating inductor passes through the bolt inner hole to heat the bolt inner hole; the bolt inner hole heating inductor comprises:

[0006] The magnetic core is used to generate a medium-frequency AC electromagnetic field after being energized. The medium-frequency AC electromagnetic field is gathered in the magnetic core and diverges to both sides of the length direction of the magnetic core.

[0007] The first inductor copper tube and the second inductor copper tube are hollow copper tubes with water pipes inside. The first inductor copper tube and the second inductor copper tube are respectively arranged on the upper and lower sides of the magnetic core of the magnetic conductor, and are used to conduct current to the magnetic core of the magnetic conductor;

[0008] A high temperature resistant insulating layer, inside of which are wrapped the first inductor copper tube, the magnetic core of the magnetic conductor and the second inductor copper tube;

[0009] A wear-resistant layer, wrapped outside the high-temperature resistant insulation layer;

[0010] The temperature sensor is arranged between the high temperature resistant insulating layer and the wear-resistant steel wire, and is used to obtain the heating temperature of the inner hole of the bolt;

[0011] The first connecting copper bar and the second connecting copper bar are electrically connected to the first sensor copper tube and the second sensor copper tube respectively. The first connecting copper bar and the second connecting copper bar are both provided with water holes in their centers, and the water holes are connected to the water pipes.

[0012] Preferably, the bolt inner hole heating sensor with temperature measurement function further comprises an insulating baffle, which is located at the power-on end and arranged outside the wear-resistant layer, and is used to fix the first connecting copper bar and the second connecting copper bar.

[0013] Preferably, the bolt inner hole heating sensor with temperature measurement function further comprises a temperature sensor plug, which is arranged at the power-on end and connected to the temperature sensor via a wire, and the wire close to the power-on end is located inside the insulating baffle.

[0014] Preferably, the bolt inner hole heating sensor with temperature measurement function further includes an insulating filling material, which is arranged between the first sensor copper tube and the second sensor copper tube and is used to fill the gap between the first sensor copper tube and the second sensor copper tube.

[0015] Preferably, the length of the magnetic conductive core is smaller than the length of the first inductor copper tube and the second inductor copper tube.

[0016] Preferably, the magnetic core of the magnetic conductor is located at the heating end.

[0017] The technical solution of the utility model proposes a bolt inner hole heating sensor with temperature measurement, which is wound by a hollow copper tube and has a built-in magnetic core. It has the function of gathering magnetism, gathering the magnetic field of the sensor inside the magnetic tube, and dissipating it at both ends of the magnetic tube, gathering the magnetic field on the inner wall of the bolt or tubular workpiece. During heating, water flows through the copper tube to cool the sensor, so the temperature of the sensor is relatively low during the heating process. The outer layer of the sensor adopts a high-temperature resistant insulating layer, and the sensor is not easy to break even if it is heated to a very high temperature. At the same time, a layer of multiple turns of spiral steel wire is wrapped around the outer periphery of the sensor of the utility model. When in use, the sensor will inevitably rub against the inner wall of the bolt. The steel wire on the outside of the sensor can isolate the sensor body from contact with the inner wall of the bolt, prevent the sensor from being worn, and increase the service life of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the bolt inner hole heating sensor with temperature measurement provided by the utility model;

[0019] Figure 2 It is the left view of the structure of the heating sensor for the inner hole of the bolt with temperature measurement;

[0020] Figure 3 It is the right view of the structure of the heating sensor for the inner hole of the bolt with temperature measurement;

[0021] Figure 4The cross-sectional view of the bolt inner hole heating sensor BB with temperature measurement;

[0022] Figure 5 It is a 10:1 enlarged view of the cross-section of the bolt inner hole heating sensor BB with temperature measurement;

[0023] Figure 6 This is a cross-sectional view of the bolt inner hole heating sensor FF with temperature measurement.

[0024] Reference numerals:

[0025] 1-first connecting copper bar; 2-second connecting copper bar; 3-insulating baffle; 4-temperature sensor plug;

[0026] 5-high temperature resistant insulation layer; 6-wear-resistant steel wire; 7-temperature sensor;

[0027] 8-first inductor copper tube; 9-second inductor copper tube; 10-magnetic core; 11-insulating filling material. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0029] The utility model provides a bolt inner hole heating inductor with temperature measurement function, which is used for heating the inner hole of the fastening bolt of a steam turbine housing. The inner hole of the fastening bolt is a hot-install bolt inner hole, a hot-dismantle bolt inner hole or an inner hole of another metal pipe.

[0030] like Figure 1 As shown, Figure 1 (a) is the front view of the bolt inner hole heating sensor with temperature measurement. Figure 1 (b) is a top view of the bolt inner hole heating sensor with temperature measurement. The heating sensor is a rod-shaped structure close to a cylinder, which uses medium-frequency electromagnetic induction to heat the center hole of a large bolt. The heating principle of the bolt inner hole heating sensor with temperature measurement is as follows:

[0031] like Figure 2-6As shown, a medium-frequency alternating current is passed through the copper tube in the inductor, and the medium-frequency alternating current enters and exits the inductor through the first connecting copper bar 1 and the second connecting copper bar 2. The current flows through the first inductor copper tube 8 and the second inductor copper tube 9, and generates a medium-frequency alternating electromagnetic field around the induction coil, that is, between the first inductor copper tube 8 and the second inductor copper tube 9. The medium-frequency alternating electromagnetic field is gathered in the magnetic core 10, and then radiates on both sides of the length direction of the magnetic core 10. Cooling water enters the first inductor copper tube 8 and the second inductor copper tube 9 through the water holes in the center of the first connecting copper bar 1 and the second connecting copper bar 2 to cool the inductor to prevent the inductor from heating and burning during the power-on process. It can also cool the magnetic core 10 to prevent the core from losing magnetism due to excessive temperature. After the core loses magnetism, it cannot play the role of gathering magnetism. The insulating filling material 11 between the first inductor copper tube 8 and the second inductor copper tube 9 plays a filling role. The area of ​​the insulating filling material 11 has a very small heating power for the external bolts and a very low heating temperature. The first inductor copper tube 8 and the second inductor copper tube 9 are wrapped with a high temperature resistant insulation layer 5 , and the high temperature resistant insulation layer 5 is wound with a wear-resistant steel wire 6 .

[0032] When the sensor is inserted into the inner hole of the bolt, the magnetic field passes through the inner wall of the bolt, thereby generating an induced current on the inner wall of the bolt, and then inducing a large power. The inner wall of the bolt is heated by the induced current, which plays a heating role. At the same time, a temperature sensor 7 is arranged on the outer surface of the sensor and connected to the temperature sensor plug 4 through a wire. When heating, the temperature sensor 7 contacts the inner wall of the bolt, detects the temperature of the inner wall of the bolt, and transmits the temperature signal.

[0033] The utility model is wound by a hollow copper tube, and has a built-in magnetic core. It has the function of gathering magnetism, gathering the magnetic field of the sensor in the magnetic core, and dispersing it at both ends of the magnetic core, gathering the magnetic field on the inner wall of the bolt or tubular workpiece, and generating a large heating power on the inner wall of the bolt. During heating, water flows through the copper tube to cool the sensor and the magnetic core. Therefore, during the heating process, the temperature of the sensor is relatively low to prevent the magnetic core from overheating and losing magnetism. The outer layer of the sensor adopts a high-temperature resistant insulating layer, which is soaked in high-temperature resistant insulating paint and then wrapped around the outside of the sensor, and then baked and cured at high temperature. After such treatment, the sensor is not easy to break even if it is heated to a higher temperature. At the same time, a layer of multiple turns of spiral steel wire (wear-resistant steel wire) is wound around the outer periphery of the sensor of the utility model. When in use, the sensor will inevitably rub against the inner wall of the bolt. The steel wire on the outside of the sensor can isolate the sensor body from contacting the inner wall of the bolt, prevent the sensor from being worn, and increase the service life of the sensor.

[0034] Generally, only the length without threads on a bolt is heated, and the length with threads is not allowed to be heated. In view of such a situation, the utility model can also design the length of the heating area according to the size of the bolt, embed the part that needs to be heated into the magnetic core, and fill the part that does not need to be heated with insulating material. In this way, only the part of the inductor signed with the magnetic core will heat the bolt, and the magnetic field of the part without the embedded magnetic core cannot gather on the inner wall of the bolt, so the heating power of the inner wall of the bolt is very small and the heating temperature is very low.

[0035] Compared with the conventional electric heating rod heating method, the utility model is characterized by: large induction power density, fast heating, uniform heating temperature, controllable heating temperature, convenient operation, high heating efficiency and durability.

[0036] The utility model provides a bolt inner hole heating sensor with temperature measurement, which is applied in the hot assembly and hot disassembly of fastening bolts on large steam turbine casings. The hot assembly process is to heat the bolts to a certain temperature through the sensor, so that the bolts expand and lengthen due to the heat, and then tighten the nuts at both ends of the bolts, and then stop heating and wait for the bolts to cool naturally. After the bolts cool down, they shrink and shorten, and the nuts at both ends are tightened by the tension after the bolts are shortened, playing the role of tightening the nuts. The hot disassembly process is that the sensor heats the inner hole of the assembled bolts to a certain temperature, so that they expand and lengthen, and the nuts at both ends loosen, and then the nuts can be easily removed and the bolts can be removed.

Claims

1. A bolt inner hole heating sensor with temperature measurement, characterized in that: The two ends of the bolt inner hole heating inductor are a heating end and a power-on end; the heating end of the bolt inner hole heating inductor passes through the bolt inner hole to heat the bolt inner hole; the bolt inner hole heating inductor includes: The magnetic core is used to generate a medium-frequency AC electromagnetic field after being energized. The medium-frequency AC electromagnetic field is gathered in the magnetic core and diverges to both sides of the length direction of the magnetic core. The first inductor copper tube and the second inductor copper tube are hollow copper tubes with water pipes inside. The first inductor copper tube and the second inductor copper tube are respectively arranged on the upper and lower sides of the magnetic core of the magnetic conductor, and are used to conduct current to the magnetic core of the magnetic conductor; A high temperature resistant insulating layer, inside of which are wrapped the first inductor copper tube, the magnetic core of the magnetic conductor and the second inductor copper tube; A wear-resistant layer, wrapped outside the high-temperature resistant insulation layer; The temperature sensor is arranged between the high temperature resistant insulating layer and the wear-resistant steel wire, and is used to obtain the heating temperature of the inner hole of the bolt; The first connecting copper bar and the second connecting copper bar are electrically connected to the first sensor copper tube and the second sensor copper tube respectively. The first connecting copper bar and the second connecting copper bar are both provided with water holes in their centers, and the water holes are connected to the water pipes.

2. A bolt inner hole heating sensor with temperature measurement as claimed in claim 1, characterized in that: It also includes an insulating baffle, which is located at the power-on end and arranged outside the wear-resistant layer, and is used to fix the first connecting copper bar and the second connecting copper bar.

3. A bolt inner hole heating sensor with temperature measurement as claimed in claim 2, characterized in that: It also includes a temperature sensor plug, which is arranged at the power-on end and connected to the temperature sensor through a wire, and the wire close to the power-on end is located inside the insulating baffle.

4. A bolt inner hole heating sensor with temperature measurement as claimed in claim 1, characterized in that: It also includes an insulating filling material, which is disposed between the first inductor copper tube and the second inductor copper tube and is used to fill the gap between the first inductor copper tube and the second inductor copper tube.

5. A bolt inner hole heating sensor with temperature measurement as claimed in claim 1, characterized in that: The length of the magnetic conductive core is smaller than the length of the first inductor copper tube and the second inductor copper tube.

6. A bolt inner hole heating sensor with temperature measurement as claimed in claim 5, characterized in that: The magnetic core of the magnetic conductor is located at the heating end.

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