CN211291784U

CN211291784U - High temperature and high humidity resistant temperature sensor

Info

Publication number: CN211291784U
Application number: CN202020162439.5U
Authority: CN
Inventors: 李伟
Original assignee: Beijing Huadian Kegong Electric Power Engineering Co ltd
Current assignee: Beijing Huadian Kegong Electric Power Engineering Co ltd
Priority date: 2020-02-11
Filing date: 2020-02-11
Publication date: 2020-08-18
Anticipated expiration: 2030-02-11

Abstract

The utility model provides a high temperature and high humidity resistant temperature sensor, sensor body top is provided with seal structure, seal structure includes the open shell in top, adhere to piece and briquetting by supreme setting gradually down in the shell, sealed lid behind the lock of shell top, it extends adheres to the piece bottom surface to adhere to the piece surface and is provided with one, the first recess of side and upper surface, the shell inside wall, interior diapire is provided with the second recess, the briquetting bottom surface is provided with the third recess, first recess, the sealed passageway that supplies the shielded wire to pass through is formed in second recess and third recess combination, it has epoxy glue all to fill between adhering to piece and shell inner wall and adhering to piece and the briquetting. Because the sealed passageway that first recess, second recess and third recess combination formed for outside high temperature and high humidity liquid along the route extension in the shield line external surface infiltration sensor body, simultaneously, the setting up of double-deck epoxy glue has also strengthened to a certain extent by the outside leakproofness to the sensor body of shell.

Description

High temperature and high humidity resistant temperature sensor

Technical Field

The utility model belongs to the technical field of the temperature sensor technique and specifically relates to a high temperature resistant and high humidity temperature sensor is related to.

Background

A temperature sensor is widely used in various industrial fields as a common detection terminal, and a platinum resistance temperature sensor belongs to one of the common temperature sensors. At present, most of platinum resistor temperature sensors adopt split type structures, the sealing performance is not enough, and particularly, when the temperature of high-temperature liquid is measured (more than 90 degrees), the platinum resistor pins are easily contacted with the external environment, so that short circuit occurs between the two pins of the platinum resistor, the output resistance value of the temperature sensor is inaccurate, and the temperature measurement is inaccurate.

In order to solve the technical problem, the chinese utility model patent with application number cn201520738050.x discloses a high temperature and high humidity resistant temperature sensor, including the temperature sensor main part, fix the inside platinum resistance cable subassembly of temperature sensor main part, press cap, silicone tube and connect and be used for the connector that the transmission sensor signal gives the secondary instrument. The platinum resistance cable assembly comprises a three-core tetrafluoro shielding wire, a platinum resistor, a heat-shrinkable tube and a polytetrafluoroethylene tape. The sensor signal is accessed to the interface of the secondary meter through the connector of the sensor so as to be transmitted to the secondary meter for processing. It realizes the sealed to the temperature sensor main part through silicone tube, epoxy glue and pressure cap to inside avoiding outside high temperature and high humidity liquid to enter into the temperature sensor body, realize the protection to the platinum resistance.

However, the pressure cap and the silicone tube do not have a strong sealing property, and therefore, the sealing of the inside of the temperature sensor body mainly depends on the filled epoxy resin adhesive. However, the platinum-ring resistance cable assembly only vertically penetrates through the epoxy resin adhesive, and the permeation distance of high-temperature and high-heat liquid permeating into the temperature sensor body through the epoxy resin adhesive is too short, so that the platinum-ring resistance cable assembly is not suitable for a long-time temperature measuring environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a not enough to prior art exists, the utility model aims at providing a high temperature resistant and high humidity temperature sensor, this temperature sensor can be applicable to the measurement high temperature and high humidity liquid temperature for a long time.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a high temperature and high humidity resistant temperature sensor comprises a tubular sensor body with an open top, a shielding wire extending into the sensor body from the top of the sensor body, a platinum resistor connected to one end of the shielding wire extending into the sensor body, a connector connected to the other end of the shielding wire, a sealing structure arranged on the top of the sensor body and comprising an outer shell with an open top, an attachment block and a pressing block sequentially arranged in the outer shell from bottom to top, a rear sealing cover buckled on the top of the outer shell, a first groove extending the bottom, side and upper surfaces of the attachment block arranged on the outer surface of the attachment block, second grooves arranged on the inner side wall and inner bottom wall of the outer shell, a third groove arranged on the bottom surface of the pressing block, a sealing channel for the shielding wire to pass through, and vertical through holes arranged at the middle positions of the pressing block and the sealing cover, the shielding wire penetrates through the two through holes and the sealing channel to penetrate into the sensor body, and epoxy resin glue is filled between the attachment block and the inner wall of the shell and between the attachment block and the pressing block.

Through adopting above-mentioned technical scheme, when equipment temperature sensor, at first insert the sensor with the shielded wire originally internally, the part that is located the casing with the shielded wire again is along second recess card in the shell bottom, afterwards, toward the intussuseption of shell intussuseption one deck epoxy glue, when epoxy glue is not dry, put into the shell with the attachment block, will expose the outside shielded wire of attachment block and go into the attachment block surface along the first recess card of attachment block side and upper surface, fill one deck epoxy glue once more, later pass the vertical through-hole on briquetting and the sealed lid with the shielded wire in proper order, and fixed sealed lid, accomplish temperature sensor's encapsulation, it all satisfies the shielded wire that the epoxy glue has not crossed the embedding recess to fill epoxy glue at every turn. Because the sealed passageway that first recess, second recess and third recess combination formed for outside high temperature and high humidity liquid along the route extension in the shield line external surface infiltration sensor body, simultaneously, the setting up of double-deck epoxy glue has also strengthened to a certain extent by the outside leakproofness to the sensor body of shell.

As the improvement of the utility model, sensor body top is provided with the silicone tube of parcel shielded wire.

Through adopting above-mentioned technical scheme, the setting up of silicone tube has not only played the initial fixed action to the shielded wire when temperature sensor assembles, also can avoid filling epoxy glue simultaneously, and epoxy glue permeates and enters into inside the sensor body.

As an improvement of the utility model, the sealing cover and the pressing block are filled with epoxy resin glue.

Through adopting above-mentioned technical scheme, the epoxy glue between sealed lid and the briquetting has not only played the fixed action to sealed lid, has also increased the sealing layer that one deck epoxy glue formed simultaneously, further improvement temperature sensor's leakproofness.

As an improvement of the utility model, the sensor body with the integrative injection moulding of shell.

By adopting the technical scheme, the production and the manufacture of the sensor body and the shell are simplified, a gap is avoided between the sensor body and the shell, and the sealing performance of the temperature sensor is further improved.

As the improvement of the utility model, two lead-out wires of shielded wire respectively with two pin connections of platinum resistance, every has all wrapped up the pyrocondensation pipe outside with the lead wire, the winding has the polytetrafluoroethylene area outside the pyrocondensation pipe.

By adopting the technical scheme, the heat-shrinkable tube is arranged to fix the outgoing line and the lead, and the polytetrafluoroethylene band is arranged to protect the connection position of the outgoing line and the lead.

As the improvement of the utility model, platinum resistance external fixation is provided with a protection casing, protection casing one end is close to platinum resistance and enstrophe and forms the arris of stepping down with platinum resistance side butt, and the other end extends and covers to the shielded wire polytetrafluoroethylene area, the protection casing with form firm clearance between the platinum resistance lateral wall, the protection casing intussuseption is filled with inorganic adhesive.

Through adopting above-mentioned technical scheme, the setting of abdicating arris and firm clearance provides the filling space of inorganic adhesive for inorganic adhesive forms the one deck between platinum resistance and protection casing and seals, and the inorganic adhesive of filling in the protection casing has also realized the sealed to lead-out wire and lead wire simultaneously, makes even have high temperature high fever liquid to enter into sensor body inside can not form the erosion to lead-out wire and lead wire yet.

To sum up, the utility model discloses a following at least one useful technological effect:

because the sealed passageway that first recess, second recess and third recess combination formed for outside high temperature and high humidity liquid along the inside route extension of shielded wire external surface infiltration sensor body, the setting up of three-layer epoxy glue has also strengthened to a certain extent by the outside leakproofness to the sensor body of shell, and simultaneously, the inorganic adhesive of filling in the protection casing has also realized the sealed to lead-out wire and lead wire, has strengthened temperature sensor's stability and security under high temperature and high humidity liquid temperature detects.

Drawings

Fig. 1 is a schematic view of a temperature sensor structure.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

In the figure, 1, a sensor body; 11. a silicone tube; 2. a housing; 21. an attachment block; 211. a first groove; 22. briquetting; 221. a third groove; 23. a sealing cover; 24. a second groove; 3. a connector; 4. a shielded wire; 5. a platinum resistor; 6. a protective cover; 61. a stabilizing gap; 7. and a protective layer.

Detailed Description

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

Referring to fig. 1 and 2, for the utility model discloses a high temperature and high humidity resistant temperature sensor, including open-topped pipy sensor body 1, stretch into the shielded wire of 1 diapire of sensor body by sensor body 1 top, shielded wire 4 is gone into the inside one end of sensor body 1 deeply and is located sensor body 1 outside and is connected with platinum resistance 5, and the other end is connected with connector 3 that is used for connecting the secondary instrument. During the use, arrange sensor body 1 in and wait to detect the position, platinum resistance 5 responds to the temperature variation and the resistance changes, and the secondary instrument is transmitted in real time to platinum resistance 5's resistance through connector 3 to the realization is to the monitoring of temperature.

Sensor body 1 top an organic whole is provided with an open-topped shell 2, and sensor body 1 and the integrative injection moulding of shell 2 have set gradually attachment block 21 and briquetting 22 by supreme down in the

shell

2, and 2 top locks of shell have sealed lid 23. Wherein, adhere to the piece 21 surface and be provided with one and extend and adhere to the first recess 211 of piece 21 bottom surface, side and upper surface, the shell 2 inside wall, interior diapire are provided with second recess 24, briquetting 22 bottom surface is provided with third recess 221, first recess 211, second recess 24 and the combination of third recess 221 form the sealed passageway that supplies shielded wire 4 to pass through, the intermediate position of briquetting 22 and sealed lid 23 all is provided with vertical through-hole, shielded wire 4 passes two through-holes in proper order and sealed passageway enters into sensor body 1 inside.

Furthermore, epoxy resin glue is filled between the attachment block 21 and the inner wall of the housing 2 and between the attachment block 21 and the pressing block 22, and the installation process of the temperature sensor is as follows.

Firstly, one end of a shielding wire 4 connected with a platinum resistor 5 extends into the sensor body 1, then the part of the shielding wire 4 positioned in the shell 2 is clamped into the inner wall of the shell 2 along the second groove 24, and a layer of epoxy resin glue is filled until the epoxy resin glue is over the part of the shielding wire 4 positioned on the inner bottom wall of the shell 2; then, the attachment block 21 is pressed into the shell 2, the shielding wire 4 is clamped on the outer surface of the attachment block 21 along the first groove 211, and epoxy resin glue is filled again until the epoxy resin glue is not clamped on the attachment block 21; and finally, the shielding wire 4 sequentially penetrates through the two through holes, the pressing block 22 is pressed into the shell 2 and then is filled with a layer of epoxy resin glue again, and the sealing cover 23 is buckled on the top of the shell 2. Here, the sealing cover 23 is screwed with the housing 2, and after the sealing cover 23 is fixed, a slight gap is left between the bottom of the sealing cover 23 and the upper surface of the pressing block 22. The amount of the epoxy resin glue filled above the pressing block 22 is enough to enable the epoxy resin glue to overflow from the inner wall of the through hole of the sealing cover 23 in the screwing and buckling process of the sealing cover 23.

In order to avoid the epoxy resin glue entering the sensor body 1 in the process of filling the epoxy resin glue for the first time, the top of the sensor body 1 is provided with a silicone tube 11 sleeved with the shielding wire 4, and the thickness of the silicone tube 11 is slightly larger than the distance between the side surface of the shielding wire 4 and the inner wall of the sensor body 1.

Referring to fig. 1 and 2, two outgoing lines of the shielding wire 4 are respectively connected with two leading lines of the platinum resistor 5, a protective layer 7 wrapping the outgoing lines and the leading lines is arranged outside the leading lines, and the protective layer 7 comprises a layer of heat-shrinkable tube and a polytetrafluoroethylene tape wound outside the heat-shrinkable tube. The end fixing that the 5 lateral surfaces of platinum resistance are close to the lead wire is provided with a protection casing 6, and the one end enstrophe that protection casing 6 is close to platinum resistance 5 forms the arris of stepping down with 5 side butt of platinum resistance, and the other end extends and covers the lead-out wire that polytetrafluoroethylene area and shielded wire 4 expose to shielded wire 4, protection casing 6 with form firm clearance 61 between the 5 lateral walls of platinum resistance, the protection casing 6 intussuseption is filled with inorganic adhesive.

From the above, when the temperature sensor is used for measuring the temperature of the high-temperature high-humidity liquid for a long time, the three layers of epoxy resin glue extend the path of the high-temperature high-humidity liquid penetrating into the sensor body 1, thereby improving the sealing performance of the sensor. Meanwhile, due to the protective cover 6 and the inorganic adhesive filled in the protective cover 6, the two incoming wires and the two outgoing wires are protected, and high-temperature and high-humidity liquid penetrating into the sensor body 1 is prevented from contacting the leading wires or the outgoing wires in a short time.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a high temperature resistant high humidity temperature sensor, includes open-topped tubulose sensor body (1), stretches into shielded wire (4) in sensor body (1) by sensor body (1) top, and shielded wire (4) are connected with platinum resistance (5) deep into the inside one end of sensor body (1), and the other end is connected with connector (3), its characterized in that: the sensor comprises a sensor body (1), wherein the top of the sensor body (1) is provided with a sealing structure, the sealing structure comprises a shell (2) with an open top, an attachment block (21) and a pressing block (22) are sequentially arranged in the shell (2) from bottom to top, a rear sealing cover (23) is buckled at the top of the shell (2), a first groove (211) extending the bottom surface, the side surface and the upper surface of the attachment block (21) is arranged on the outer surface of the attachment block (21), a second groove (24) is arranged on the inner side wall and the inner bottom wall of the shell (2), a third groove (221) is arranged on the bottom surface of the pressing block (22), the first groove (211), the second groove (24) and the third groove (221) are combined to form a sealing channel for a shielding wire (4) to pass through, vertical through holes are formed in the middle positions of the pressing block (22) and the sealing cover (23), and the shielding wire (4, epoxy resin glue is filled between the attachment block (21) and the inner wall of the shell (2) and between the attachment block (21) and the pressing block (22).

2. The high temperature and humidity resistant temperature sensor according to claim 1, wherein: the top of the sensor body (1) is provided with a silicone tube (11) wrapping the shielding wire (4).

3. The high temperature and humidity resistant temperature sensor according to claim 1, wherein: epoxy resin glue is filled between the sealing cover (23) and the pressing block (22).

4. The high temperature and humidity resistant temperature sensor according to claim 1, wherein: the sensor body (1) and the shell (2) are integrally formed in an injection molding mode.

5. The high temperature and humidity resistant temperature sensor according to claim 1, wherein: two outgoing lines of the shielding wire (4) are respectively connected with two leading lines of the platinum resistor (5), each leading line is wrapped with a heat-shrinkable tube, and a polytetrafluoroethylene tape is wound outside each heat-shrinkable tube.

6. The high temperature and humidity resistant temperature sensor according to claim 5, wherein: platinum resistance (5) external fixation is provided with a protection casing (6), protection casing (6) one end is close to platinum resistance (5) and enstrophe forms the arris of stepping down with platinum resistance (5) side butt, and the other end extends and covers to shielded wire (4) polytetrafluoroethylene area, protection casing (6) with form firm clearance (61) between platinum resistance (5) lateral wall, protection casing (6) intussuseption is filled with inorganic adhesive.