CN1166930C - Optical sensor temperature monitoring device - Google Patents

Abstract

The optical sensor temperature monitoring device is to prevent the occurrence of high-voltage switches or transformers and other electrical equipment being burned due to overheating, and to monitor their temperature changes so that measures can be taken in time to eliminate the signs of accidents. The device has a reflector mounted on a temperature-sensing component made of two materials with different thermal expansion coefficients, and the temperature-sensing component can be a two-bracket structure or a bimetal structure. The temperature-sensing member is in contact with the temperature measuring point or as close as possible, a beam of collimated light is irradiated on the reflector, the light reflected from the reflector is received by the receiver, and the output signal of the receiver is connected to the processing device. The temperature-sensing component will cause the deflection of the mirror with the temperature change of the temperature measurement point. There is a linear relationship between the two. The position of the receiver can indicate the deflection of the mirror, so the temperature of the measured object can be measured. The device can be installed in a high-voltage switch cabinet, and can also be used in a place with a large space.

Description

Optical sensor temperature monitoring device

technical field

The invention belongs to the field of temperature monitoring and relates to a light sensing remote temperature monitoring device.

Background technique

In ultra-high voltage transmission lines, due to some reasons, high-voltage electric switches or transformers and other electrical equipment will generate a lot of heat. If they cannot be dealt with in time, high-voltage switches or transformers will be burned, resulting in accidents and major economic losses. . Therefore, it is very important to monitor the temperature of equipment such as high voltage switch contacts and transformers. However, because the environment that needs to be monitored for temperature is in a strong electromagnetic field, it is difficult for the general contact temperature measurement method to solve the insulation and electromagnetic interference problems. Using the non-contact infrared radiation temperature measurement method, the measurement results are easily affected by the environment, the cost is high, and it is not suitable for use in high-voltage switchgear and other situations.

Contents of the invention

The present invention aims at the problems of the prior art, and provides an optical sensing remote temperature monitoring device, which can work in a strong electromagnetic field environment, is not affected by the environment, and can achieve higher measurement accuracy and monitoring reliability.

In order to achieve the above goals, the basic idea is to use optical methods to solve the problems of insulation and electromagnetic interference in strong electromagnetic fields, using the linear thermal expansion properties of materials, combined with simple optical principles for temperature monitoring in strong electromagnetic fields.

The basic technical solution is: install the reflector on the temperature-sensing member made of two materials with different thermal expansion coefficients. The temperature-sensing member can be a two-bracket structure or a bimetal structure. As close as possible, a beam of collimated light is irradiated on the mirror, and the light reflected from the mirror is accepted by the receiver, which is connected to the processing device through the output signal of the receiver. The processing device has photoelectric conversion, signal amplification, data processing, recording and display, Alarm and other functional devices can monitor the temperature of the electrical equipment under test according to the position indication of the receiver.

The so-called two-bracket structure is to use two materials with different thermal expansion coefficients to make two brackets for supporting the mirror; the so-called bimetal sheet refers to a sheet material formed by bonding two metals with different thermal expansion coefficients. There are two forms of the sheet structure, one is similar to the two-stent structure, when the brackets made of two metal materials are completely bonded together, it becomes a type of bimetal sheet structure, and the other is to bend the bimetal sheet into a It is U-shaped, and the two arms of the U-shaped are connected to the reflector and the base respectively. In this device, although there are many options for the structural form of the temperature sensing member, the principle of temperature measurement and the realization method are basically the same.

Beneficial effects of the invention:

(1) The device completely solves the problem of insulation and interference in high electromagnetic fields due to the use of an all-optical method for temperature measurement and signal transmission;

(2) Since the device utilizes the linear thermal expansion property of the material, the reflection optical path amplifies the thermal expansion and deformation, so it can obtain high measurement accuracy in the entire temperature range, and can realize high-reliability monitoring;

(3) The device is simple in structure, low in cost, and very convenient in use and maintenance.

Description of drawings

Fig. 1 is the structural representation of example 1;

Fig. 2 is the structural representation of example 2;

Fig. 3 is a schematic diagram of the temperature measurement principle of the present invention;

Fig. 4 is the structural representation of example 3;

FIG. 5 is a schematic structural view of Example 4.

Detailed ways:

Embodiments of the technical solution will be described in detail with reference to the accompanying drawings.

Example 1 is a closed structural device, and its temperature-sensing member adopts a bracket structure. As shown in Figure 1, the external incident light 19 passes through the optical fiber 1 and passes through the lens 3 on the base 2 mounted on the casing 12 to be converted into collimated light 4 and irradiates on the reflector 5, which is made of materials with different thermal expansion coefficients. Make the end of the bracket 6 and the bracket 7 of the temperature-sensitive member, the two brackets are fixed on the casing 12 by the base 8, and the side of the casing connected to the two brackets is at the temperature measurement point; A series of receivers 10 arranged at a certain interval are arranged in the direction where the light 9 intersects, and the series of receivers are fixedly installed on the casing 12 by the base 11 at a certain angle. Each receiver is connected with an optical fiber 13, and the optical signal is transmitted through the optical fiber 13 to a conversion processing and display device outside the influence range of the strong electromagnetic field. The temperature measurement point is located where the electrical equipment that needs temperature monitoring is located, and is within the influence range of the strong electromagnetic field. When a fault occurs and the temperature of the temperature measuring point changes, the temperature of the bracket 6 and the bracket 7 will change accordingly. Since the thermal expansion coefficients of the bracket 6 and the bracket 7 are different, the length difference between the two brackets will change with the temperature. As a result, the reflector 5 installed on the bracket is deflected, and there is a certain linear relationship between the amount of temperature change and the deflection angle. As shown in Figure 3, there is an angle θ between the deflected reflector 5' and the original position 5 of the reflector. Although the direction of the incident light 4 remains unchanged, the direction of the reflected light 9' and the direction of the original reflected light 9 also exist. angle theta. A series of receivers 10 are set in the direction of the reflected light, and the reflected light 9' and the original reflected light 9 will be accepted by different receivers, and the position of the receiver can indicate the size of the deflection of the reflector. The linear relationship between the deflection and the temperature change can further determine the temperature change of the measured object, and the temperature value of the measured object can be measured after calibration. The temperature measurement device shown in Figure 1 is placed within the range of influence of the strong electromagnetic field, the light source is placed outside the range of influence of the strong electromagnetic field, and the incident light is transmitted into the temperature measurement device with the optical fiber 1, and the collimated light 4 passes through the reflector 5 After reflection, the reflected light 9 is received by a series of receivers 10 arranged at a certain distance, and the receiver 10 can be a kind of lens to focus the collimated light 9 into the optical fiber 13 . Then the optical signal 18 is transmitted by the optical fiber 13 to the processing device 17 outside the influence range of the strong electromagnetic field to realize functions such as photoelectric conversion, signal amplification, data processing, recording and display, and alarm. Since each receiver corresponds to an output optical fiber, as long as the optical signal in a certain optical fiber is detected, the position of the receiver 10 that receives the reflected light can be judged, thereby judging the deflection of the mirror, and obtaining the measured Object temperature, to achieve the purpose of temperature monitoring. In summary, the accuracy of temperature measurement is mainly determined by the magnitude of the deflection angle of the mirror with temperature, the distance between the receiver and the mirror, and the number of receivers. Since the signal light is transmitted to the outside of the strong electromagnetic field through the optical fiber and then processed, it can be completely insulated from high voltage and free from interference from external strong electromagnetic fields. This device is small in size and less affected by external interference, so it is suitable for installation in high-voltage switch cabinets and the like.

Example 2 also adopts a bracket type, but an implementation device of an open structure in which light propagates in free space. As shown in Figure 2, a beam of collimated light 4 produced by a light source 14 outside the strong electromagnetic field is aimed at the reflector 5, and the reflected light 9 reflected by the reflector 5 is irradiated to the receiver installed outside the range of influence of the strong electromagnetic field 15, the receiver 15 is composed of a plurality of photodetectors, through which the optical signal is converted into an electrical signal 20 and output to the signal processing device (17). The temperature of the electrical equipment under test can be obtained from the position of the photodetector. This device has a simple structure and is suitable for installation in an environment with a large space.

Example 3 As shown in FIG. 4 , the temperature sensing member adopts a U-shaped bimetal 16 , and the two arms of the bimetal are respectively connected and fixed to the reflector 5 and the base 8 . When the temperature changes, the opening angle of the U-shaped structure will change, thereby changing the angle of the reflector 5 connected to it, so as to achieve the purpose of sensing temperature. Its optical path structure and working principle are similar to Example 1 or Example 2.

Example 4 As shown in Figure 5, the temperature-sensing member adopts a bracket-type bimetallic sheet, and the bracket 16 is composed of two metal brackets with different thermal expansion coefficients adhered to each other. 1 or Example 2 are similar in structure, and the working principle of this embodiment is also similar to the above three examples.

Claims (7)

1, light-sensing temperature monitor, comprise temperature-sensitive member and treating apparatus, it is characterized in that the temperature-sensitive member is to be made by two kinds of materials having different thermal expansion coefficient, the temperature-sensitive member contacts with point for measuring temperature or installs with point for measuring temperature is close, one end of temperature-sensitive member is installed a catoptron, the other end links to each other with mounting seat, and mounting seat contacts with point for measuring temperature or be close with point for measuring temperature; A branch of collimated light is radiated at catoptron, on the direction that the reflected light with catoptron intersects a series of receivers is set, and to handling device, treating apparatus is located at outside the strong-electromagnetic field coverage by the receiver output signal.

2, by the described light-sensing temperature monitor of claim 1, it is characterized in that the temperature-sensitive member is made of two supports (6,7), described two supports (6,7) are made with different thermal expansion coefficient material.

3, by the described light-sensing temperature monitor of claim 1, it is characterized in that the temperature-sensitive member made by bimetallic strip, its form is U type or support rack type.

4, by claim 1 or 2 described light-sensing temperature monitors, it is characterized in that having the casing (12) of this device, one side of casing is located on the point for measuring temperature, the mounting seat (8) of temperature-sensitive member is equipped with in this side near the point for measuring temperature place in casing (12), end as two supports (6,7) of temperature-sensitive member is contained on the base (8) other end attaching catoptron (5) respectively; The mounting seat (2) of optical fiber (1) is equipped with in another side in casing (12), is equipped with on the base of optical fiber lens (3) are housed; The mounting seat (11) of receiver also is housed in casing (12), by certain angle a series of receivers (10) is installed being equipped with on the base of receiver, receiver is arranged on the direction that intersects with reflected light (9) at a certain distance; Incident light (19) is converted into collimated light (4) through optical fiber (1) scioptics (3) and shines catoptron (5), the reflected light of catoptron (9) shines a series of receivers (10), each receiver all connects an optical fiber (13), and light signal (18) is transferred to treating apparatus (17) outside the strong-electromagnetic field coverage through optical fiber (13).

5, by claim 1 or 2 described light-sensing temperature monitors, it is characterized in that producing a branch of collimated light (4) by the light source outside the strong-electromagnetic field coverage (14) aims at catoptron (5), its reflected light (9) shines on a series of receivers (15) that are installed in outside the strong-electromagnetic field coverage, receiver can be made up of a plurality of photodetectors, via photodetector light signal is converted into electric signal (20) and outputs to treating apparatus (17).

6, by claim 1 or 3 described light-sensing temperature monitors, it is characterized in that the temperature-sensitive member is a U type bimetallic strip (16), its two arm links to each other with the base (8) of catoptron (5) and temperature-sensitive member respectively.

7, by claim 1 or 3 described light-sensing temperature monitors, it is characterized in that the bimetallic strip (16) that the temperature-sensitive member is made up of two kinds of different metals of inter-adhesive thermal expansivity, its two ends link to each other with the base (8) of catoptron (5) and temperature-sensitive member respectively.

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