CN204165670U - A kind of SAW Temperature Sensors for outdoor high voltage environment - Google Patents

Abstract

The utility model discloses a surface acoustic wave temperature sensor used in an outdoor high-voltage environment, comprising a fixing device fixed on a measured object and a surface acoustic wave temperature detection device installed on the fixing device for detecting the temperature of the measured object , the surface acoustic wave temperature detection device includes a heat-conducting ceramic circuit board and a temperature sensor chip and a spiral antenna welded on a plane on the heat-conducting ceramic circuit board, the bottom surface of the heat-conducting ceramic circuit board is bonded and fixed to a fixing device, and the temperature sensor chip And the helical antenna is hermetically closed by the sealing cover. The utility model is small in size, light in weight, does not need an external power supply, works wirelessly, has waterproof and insulating properties, and is suitable for temperature measurement in an outdoor high-voltage environment.

Description

A surface acoustic wave temperature sensor for outdoor high voltage environment

technical field

The utility model relates to a surface acoustic wave temperature sensor used in an outdoor high-voltage environment.

Background technique

As an important link in the power system, the substation is directly related to the safety of the entire power grid. The high-voltage equipment in the substation will heat up due to internal faults or poor contact of the connection parts. If it cannot be found and dealt with in time, it is likely to cause major equipment accidents. Real-time monitoring of the temperature of key parts of operating equipment, providing early warning of failure points, can prevent equipment accidents from happening.

Traditional temperature measurement methods, such as infrared temperature measurement, active sensor temperature measurement, optical fiber temperature measurement, etc., have achieved the detection and monitoring of equipment temperature to a certain extent, but there are some shortcomings. Infrared temperature measurement can only measure the temperature of the measured object indirectly, and many key positions cannot be detected, and infrared temperature measurement is sensitive to environmental factors, so it is not suitable for real-time monitoring of key points of equipment outdoors. Active temperature sensors need battery power, and the service life of batteries is greatly affected by external environments such as temperature. At the same time, active sensors contain a large number of IC devices, which reduce the reliability of active temperature sensors in outdoor operation. Optical fiber is generally suitable for indoor environments, and the optical fiber is easy to break; when working for a long time, the creepage distance is reduced.

Utility model content

The technical problem to be solved by the utility model is to provide a surface acoustic wave temperature sensor used in an outdoor high-voltage environment, which not only has passive and wireless characteristics, but also has waterproof and insulating characteristics.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a surface acoustic wave temperature sensor for outdoor high voltage environment, including a fixing device fixed on the measured object and installed on the fixing device to detect A surface acoustic wave temperature detection device for object temperature, the surface acoustic wave temperature detection device includes a heat-conducting ceramic circuit board, a temperature sensor chip and a spiral antenna welded on a plane on the heat-conducting ceramic circuit board, the bottom surface of the heat-conducting ceramic circuit board and the fixing device The heat-conducting ceramic circuit board conducts the temperature of the measured object, the temperature sensor chip is used to sense the temperature of the measured object, and the helical antenna captures electromagnetic waves as working energy and returns electromagnetic waves carrying temperature information at the same time. The temperature sensor chip and the helical antenna are hermetically sealed by a sealing cover.

Preferably, the bottom of the sealing cover is provided with a rectangular fixing plate, the center of the fixing plate is connected with the inner cavity of the sealing cover, and the fixing plate is provided with an annular sealing groove around the inner cavity of the sealing cover. A sealing ring is embedded in the sealing groove, and the bottom surface of the fixing plate is bonded and fixed to the heat-conducting ceramic circuit board.

Preferably, the fixing device includes an upper fixing block and a lower fixing block that are assembled and fixed as one, the upper fixing block and the lower fixing block are rectangular block structures with semicircular notches, after the upper fixing block and the lower fixing block are combined A circular mounting hole is formed in the middle.

Preferably, the upper and lower fixing blocks are made of tungsten-copper alloy.

The technical scheme adopted by the utility model conducts the temperature of the measured object through the heat-conducting ceramic circuit board, the temperature sensor chip is used to sense the temperature of the measured object, captures the electromagnetic wave as the working energy through the helical antenna, and returns the electromagnetic wave carrying the temperature information at the same time. Through the above method, a temperature sensor is made, which solves the problem that the traditional temperature sensor cannot have passive and wireless characteristics at the same time.

In addition, after the sealing cover is added, the temperature sensor not only has passive and wireless characteristics, but also has the characteristics of waterproof and insulation.

Therefore, the utility model is small in size, light in weight, does not need an external power supply, works wirelessly, has waterproof and insulating properties, and is suitable for temperature measurement in an outdoor high-voltage environment.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described:

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is the schematic diagram when the surface acoustic wave temperature detection device is not covered with a sealing cover;

3 is a schematic diagram of a sealing cover in a surface acoustic wave temperature detection device;

Fig. 4 is a schematic diagram of the structure of the fixing device.

Detailed ways

The utility model is described in detail below in conjunction with Fig. 1 to Fig. 4, a kind of surface acoustic wave temperature sensor that is used in outdoor high-voltage environment, comprises the fixing device 2 that is fixed on the measured object and is installed on the fixing device and is used for detecting The surface acoustic wave temperature detection device 1 of object temperature, the surface acoustic wave temperature detection device 1 comprises a heat-conducting ceramic circuit board 11 and a temperature sensor chip 12 and a helical antenna 13 welded on a plane of the heat-conducting ceramic circuit board, the heat-conducting ceramic circuit The bottom surface of the board is bonded and fixed with the fixing device. The heat-conducting ceramic circuit board conducts the temperature of the object under test. The temperature sensor chip is used to sense the temperature of the object under test. The helical antenna captures electromagnetic waves as working energy and returns to carry the temperature The electromagnetic waves of information, the temperature sensor chip and the helical antenna are hermetically sealed by the sealing cover 14 . The bottom of the sealing cover is provided with a rectangular fixing plate 15, the center of the fixing plate communicates with the inner cavity of the sealing cover, and the fixing plate is provided with an annular sealing groove around the mouth of the sealing cover inner cavity, and the sealing groove A sealing ring 16 is embedded in the middle, and the bottom surface of the fixing plate is bonded and fixed to the heat-conducting ceramic circuit board. The fixing device 2 includes an upper fixing block 21 and a lower fixing block 22 which are assembled and fixed as one. The upper fixing block and the lower fixing block are all rectangular block structures with semicircular notches. After the upper fixing block and the lower fixing block are put together A circular mounting hole is formed in the middle.

As shown in FIG. 2 , the temperature sensor chip 12 and the helical antenna 13 are welded on the thermally conductive ceramic circuit board 11 . Circuit board fixing holes 111 are opened around the heat-conducting ceramic circuit board. As shown in Figure 3, the four corners of the fixed plate 15 are provided with side holes 151. When installing, the sealing ring 16 is embedded in the sealing groove of the sealing cover 14, and then covered on the heat-conducting ceramic circuit board 11, and the temperature sensor chip 12 and the screw The antenna 13 is inserted into the sealing cover 14 to play a waterproof role.

As shown in FIG. 4 , the upper and lower fixing blocks are made of materials with high thermal conductivity and low expansion coefficient, such as tungsten-copper alloy. The upper and lower fixing blocks are combined through the upper fixing hole 212 and the lower fixing hole 221 . The upper fixing block is also provided with assembly holes 211 corresponding to the circuit board fixing holes 111 around the heat-conducting ceramic circuit board and the four-corner side holes 151 of the fixing plate 15, as shown in Figure 1, the heat-conducting ceramic circuit covered with the sealing cover 14 The board 11 is placed on the upper fixing block, and fixed and installed through the side hole 151 , the circuit board fixing hole 111 and the corresponding assembly hole 211 . The measured object passes through the circular mounting hole between the upper and lower fixing blocks, and the upper and lower fixing blocks are fastened through the upper fixing hole 212 and the lower fixing hole 221, so that the entire sensor is fixed on the measured object.

Claims (4)

1. the SAW Temperature Sensors for outdoor high voltage environment, comprise the stationary installation (2) that is fixed on testee and be installed on the surface acoustic wave temperature-detecting device (1) stationary installation being used for detecting testee temperature, it is characterized in that: described surface acoustic wave temperature-detecting device (1) comprises heat-conductivity ceramic circuit board (11) and is welded in temperature sensor chip (12) and the helical antenna (13) of plane on heat-conductivity ceramic circuit board, described heat-conductivity ceramic circuit board bottom surface and stationary installation are fitted fixing, the temperature of described heat-conductivity ceramic circuit board conduction testee, described temperature sensor chip is used for the temperature of perception testee, described helical antenna catches electromagnetic wave as work capacity, return the electromagnetic wave carrying temperature information simultaneously, described temperature sensor chip and helical antenna hermetically enclosed by gland bonnet (14).

2. a kind of SAW Temperature Sensors for outdoor high voltage environment according to claim 1, it is characterized in that: the bottom of described gland bonnet is provided with the fixed head of rectangle (15), described fixed head center and gland bonnet inner chamber through, described fixed head is provided with the seal groove of annular around gland bonnet inner chamber oral area, be embedded with O-ring seal (16) in described seal groove, described fixed head bottom surface and heat-conductivity ceramic circuit board are fitted fixing.

3. a kind of SAW Temperature Sensors for outdoor high voltage environment according to claim 2, it is characterized in that: described stationary installation (2) comprises the upper fixed block (21) and lower fixed block (22) that split is fixed as one, fixed piece and lower fixed block are the rectangular block architecture being provided with half round cut, the conglobate mounting hole of shape in the middle of after upper fixed block and lower fixed block split.

4. a kind of SAW Temperature Sensors for outdoor high voltage environment according to claim 3, is characterized in that: be made up of tungsten-copper alloy with lower fixed block for fixed piece.