CN213748847U - High-temperature-resistant sensor - Google Patents

Abstract

The utility model discloses a high temperature resistant sensor, which relates to the technical field of electronic machinery. The utility model comprises a casing, a constant temperature layer, a low-pressure cavity, a heat dissipation plate, a high-pressure cavity and an external thread. A first nut is fixedly connected above the casing through a first fixing sleeve, and a low-pressure cavity is fixedly connected above the first nut. A low-voltage connector is fixedly connected to the right end of the cavity, an octagonal nut is fixedly connected to the right end of the low-voltage connector, a heat-dissipating plate is fixedly connected to the bottom of the casing through a second fixing sleeve, a constant temperature layer is fixedly connected to the outside of the casing and the heat-dissipating plate, and a constant-temperature layer is fixedly connected to the bottom of the heat-dissipating plate. A second nut, a high-pressure chamber is fixedly connected below the second nut, and an outer thread is arranged on the outer side of the lower end of the high-pressure chamber. The utility model solves the problem that the existing piezoresistive pressure sensor has a temperature drift caused by the rise of the resistance heating temperature and the failure to timely freeze in winter by arranging a casing, a constant temperature layer, a low pressure cavity, a heat dissipation plate, a high pressure cavity and an external thread. Take antifreeze measures to cause the problem of sensor damage.

Description

High-temperature-resistant sensor

Technical Field

The utility model belongs to the technical field of electronic machinery, especially, relate to a high temperature resistant sensor.

Background

The sensor is a detection device which can sense the information to be measured and convert the sensed information into an electric signal or other information in a required form according to a certain rule to be output so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. The piezoresistive pressure sensor is formed by utilizing the piezoresistive effect of single crystal silicon. A monocrystalline silicon wafer is used as an elastic element, a group of equivalent resistors are diffused in a specific direction of monocrystalline silicon on the monocrystalline silicon wafer by utilizing the process of an integrated circuit, the resistors are connected into a bridge circuit, and the monocrystalline silicon wafer is arranged in a sensor cavity. When the pressure changes, the monocrystalline silicon generates strain, so that the strain resistance directly diffused on the monocrystalline silicon generates proportional change of the measured pressure, and then a bridge circuit obtains a corresponding voltage output signal. The piezoresistive pressure sensor is the most widely applied sensor in the current pressure measurement, has the characteristics of high frequency response, high precision, good stability, small volume, integration and the like, is widely applied to the industrial fields of petroleum, chemical engineering, electrical and the like at present, is an ideal pressure sensor which is rapidly developed and gradually becomes the mainstream of the market, and has the following defects in the practical use:

1. the resistance of the existing piezoresistive pressure sensor generates heat to generate temperature drift, so that the stability and the precision are greatly influenced;

2. when the existing piezoresistive pressure sensor freezes in winter, anti-freezing measures must be taken in time to avoid the damage of the sensor.

Therefore, the existing piezoresistive pressure sensor cannot meet the requirements in practical use, so that an improved technology is urgently needed in the market to solve the problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high temperature resistant sensor, through setting up casing, thermostatic layer, low-pressure chamber, heating panel, high-pressure chamber and external screw thread, the resistance of having solved current piezoresistive pressure sensor generates heat and produce temperature drift and take place in winter not in time to take the problem that anti-freezing measure caused the sensor to damage when freezing.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model relates to a high temperature resistant sensor, which comprises a shell, a constant temperature layer, a low pressure cavity, a heat radiation plate, a high pressure cavity and an external thread, wherein the upper part of the shell is fixedly connected with a first nut through a first fixing sleeve, the shell is used as the main body part of the sensor and is used for protecting the important internal structure of the sensor, the upper part of the first nut is fixedly connected with the low pressure cavity, the right end of the low pressure cavity is fixedly connected with a low pressure joint, the right end of the low pressure joint is fixedly connected with an octagonal nut and is used for outputting and transmitting the information of the measured liquid, the lower part of the shell is fixedly connected with the heat radiation plate through a second fixing sleeve and is used for reducing the influence of the temperature on the stability and the precision of the sensor, the constant temperature layer is fixedly connected with the outer parts of the shell and the heat radiation plate and is used for protecting the main body of the sensor, stabilizing the temperature of the sensor under the freezing environment in winter and increasing the corrosion resistance of the sensor, the heating panel below fixedly connected with second nut, second nut below fixedly connected with high-pressure chamber, the high-pressure chamber lower extreme outside is provided with the external screw thread for connect the detected object.

Further, the heating panel passes through second fixed sleeve fixed connection between high-pressure chamber and casing for share and give off the heat that detects the environment, give off the heat energy that produces in the resistance work, improve the stability and the measuring degree of accuracy of sensor, the constant temperature layer parcel is in the heating panel outside, heating panel bottom and air direct contact, direct and outside air contact increase radiating efficiency.

Further, the constant temperature layer includes annular container, overhead gage, upper end breach, water injection hole, exhaust hole, outer wall and inner wall, no entity forms annular container between inner wall and the outer wall, pours into phase change material into annular container, and phase change material adjusts the temperature in the sensor through the solid-state liquid form's of self transformation, forms the constant temperature effect, water injection hole and exhaust hole have been seted up to annular container upper end, and water injection hole and exhaust hole help changing the phase change material in the annular container, annular container upper end fixedly connected with overhead gage, the upper end breach has been seted up to the overhead gage, and the upper end breach agrees with first fixed sleeve size, easy to assemble and waterproof.

Further, inside wire, evaluation circuit, diaphragm and the high-pressure joint of including of casing, wire below fixedly connected with evaluation circuit, evaluation circuit below fixedly connected with diaphragm utilizes the piezoresistive effect of monocrystalline silicon, but when pressure changes, and monocrystalline silicon produces deformation, and strain resistance produces corresponding change, diaphragm lower extreme fixedly connected with high-pressure joint for contact with the measured object.

The utility model discloses following beneficial effect has:

1. the utility model discloses a set up the heating panel, the resistance of having solved piezoresistive pressure sensor generates heat and influences measuring stability and precision, the utility model provides a heating panel is connected with the sensor, and bottom and air contact provide better radiating effect for piezoresistive pressure sensor, the effectual high temperature resistance nature of sensor that has improved.

2. The utility model discloses a set up the constant temperature layer, solved piezoresistive pressure sensor and taken in time not taking the sensor damage that antifreeze measures lead to when freezing winter, the utility model provides a constant temperature layer adds phase change material through the annular container on constant temperature layer, maintains the temperature of sensor, makes the sensor not influenced by ambient temperature.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a perspective view of the housing of the present invention;

FIG. 3 is an enlarged view of the structure of the heat dissipation plate of the present invention;

FIG. 4 is a three-dimensional structure diagram of the constant temperature layer of the present invention;

FIG. 5 is a top view of the constant temperature layer of the present invention;

FIG. 6 is a front view of the constant temperature layer of the present invention;

fig. 7 is an inside elevation view of the housing of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a housing; 101. a wire; 102. an evaluation circuit; 103. a membrane; 104. a high-pressure joint; 2. a constant temperature layer; 201. an annular container; 202. an upper baffle plate; 203. an upper end gap; 204. a water injection hole; 205. an exhaust hole; 206. an outer wall; 207. an inner wall; 3. a low pressure chamber; 301. a low pressure connection; 302. an octagonal nut; 303. a first nut; 304. a first fixed sleeve; 4. a second fixed sleeve; 5. a heat dissipation plate; 6. a second nut; 7. a high pressure chamber; 8. and (4) external threads.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-2, the utility model relates to a high temperature resistant sensor, which comprises a housing 1, a constant temperature layer 2, a low pressure chamber 3, a heat dissipation plate 5, a high pressure chamber 7 and an external thread 8, wherein the upper part of the housing 1 is fixedly connected with a first nut 303 through a first fixing sleeve 304, the housing 1 is used as the main body part of the sensor for protecting the important internal structure of the sensor, thereby effectively prolonging the service life of the internal structure, the stainless steel is more corrosion-resistant and is not easy to rust, the low pressure chamber 3 is fixedly connected with the upper part of the first nut 303, the right end of the low pressure chamber 3 is fixedly connected with a low pressure joint 301, the right end of the low pressure joint 301 is fixedly connected with an octagonal nut 302 for outputting and transmitting the information of the measured liquid, thereby being more effective waterproof and dustproof, the heat dissipation plate 5 is fixedly connected with the lower part of the housing 1 through a second fixing sleeve 4 for reducing the influence of the temperature on the stability and the precision of the sensor, casing 1 and 5 outside fixedly connected with constant temperature layer 2 of heating panel for the protection sensor main part, stabilize the sensor temperature under the freezing environment winter, and the corrosion resistance of multiplicable sensor, 5 below fixedly connected with second nuts 6 of heating panel, 6 below fixedly connected with high-pressure chamber 7 of second nut, the 7 lower extreme outsides in high-pressure chamber are provided with external screw thread 8, be used for connecting the detected object, play cushioning effect extension sensor life simultaneously.

Wherein as shown in fig. 3, heating panel 5 is through 4 fixed connection of second fixed sleeve between high-pressure chamber 7 and casing 1, a heat for sharing and giving off the detection environment, give off the heat energy that produces in the resistance work, improve the stability and the measuring degree of accuracy of sensor, thermostatic layer 2 wraps up in the heating panel 5 outside, 5 bottoms of heating panel and air direct contact, heating panel 5 adopts the structure setting of multilayer, increase heat dissipation space and radiating efficiency, make the measurement more accurate of sensor, the performance is more stable.

As shown in fig. 4-6, the thermostatic layer 2 includes an annular container 201, an upper baffle 202, an upper end notch 203, a water injection hole 204, an exhaust hole 205, an outer wall 206 and an inner wall 207, there is no entity between the inner wall 207 and the outer wall 206 to form the annular container 201, a phase-change material is injected into the annular container 201, the phase-change material changes the temperature in the sensor through the transition of its solid-liquid form, when the sensor is overheated, the phase-change material is changed from the solid form to the liquid form to absorb heat and achieve the cooling effect, when the temperature of the sensor is too low due to the influence of the environmental temperature, the phase-change material is changed from the liquid form to the solid form to release heat and form a thermostatic action, the upper end of the annular container 201 is provided with the water injection hole 204 and the exhaust hole 205, the water injection hole 204 and the exhaust hole 205 are helpful to replace the phase-change material in the annular container 201, and avoid the deformation of the solid-liquid state caused by the transition of the container, annular container 201 upper end fixedly connected with overhead gage 202, overhead gage 202 has seted up upper end breach 203, and upper end breach 203 agrees with first fixed sleeve 304 size, makes things convenient for the fixed mounting and the waterproof of thermostatic layer 2.

As shown in fig. 7, the inside of the housing 1 includes a lead 101, an evaluation circuit 102, a diaphragm 103 and a high-voltage connector 104, the evaluation circuit 102 is fixedly connected below the lead 101, the diaphragm 103 is fixedly connected below the evaluation circuit 102, under the action of a pressure measured by using the piezoresistive effect of monocrystalline silicon, the diaphragm 103 generates stress and strain, distortion causes the change of the internal energy level structure of the crystal, further causes the change of the relative energy of carriers, thereby causing the change of the alert intrinsic resistivity, thereby causing the change of the resistance, and generating measurement data, and the high-voltage connector 104 is fixedly connected at the lower end of the diaphragm 103 for contacting with a measured object.

One specific application of this embodiment is: through setting up heating panel 5 and thermostatic layer 2, for piezoresistive pressure sensor provides better radiating effect, the effectual high temperature resistance nature that improves the sensor, add phase change material in thermostatic layer 2's annular container 201, maintain the temperature of sensor, prevent effectively that the sensor from freezing in winter the proruption in time taking the sensor damage that anti-freezing measure caused.

The above is only the preferred embodiment of the present invention, and the present invention is not limited thereto, any technical solutions recorded in the foregoing embodiments are modified, and some technical features thereof are replaced with equivalent ones, and any modification, equivalent replacement, and improvement made thereby all belong to the protection scope of the present invention.

Claims (4)

1. A high temperature sensor, comprising a casing (1), a constant temperature layer (2), a low pressure chamber (3), a heat sink (5), a high pressure chamber (7) and an external thread (8), characterized in that: all A first nut (303) is fixedly connected above the casing (1) through a first fixing sleeve (304), and a low pressure chamber (3) is fixedly connected above the first nut (303), and the low pressure chamber ( 3) A low-voltage connector (301) is fixedly connected to the right end, an octagonal nut (302) is fixedly connected to the right end of the low-voltage connector (301), and a heat dissipation device is fixedly connected to the bottom of the housing (1) through a second fixing sleeve (4). plate (5), a constant temperature layer (2) is fixedly connected to the outside of the housing (1) and the heat dissipation plate (5), and a second nut (6) is fixedly connected to the bottom of the heat dissipation plate (5). A high pressure chamber (7) is fixedly connected below the nut (6), and an outer thread (8) is provided on the outer side of the lower end of the high pressure chamber (7). 2 . The high temperature sensor according to claim 1 , wherein the heat dissipation plate ( 5 ) is fixedly connected between the high pressure chamber ( 7 ) and the casing ( 1 ) through the second fixing sleeve ( 4 ). 3 . During the time, the constant temperature layer (2) is wrapped on the outside of the heat dissipation plate (5), and the bottom of the heat dissipation plate (5) is in direct contact with the air. 3 . The high temperature sensor according to claim 1 , wherein the constant temperature layer ( 2 ) comprises an annular container ( 201 ), an upper baffle plate ( 202 ), an upper end notch ( 203 ), and a water injection hole ( 204 ). 4 . ), the exhaust hole (205), the outer wall (206) and the inner wall (207), there is no entity between the inner wall (207) and the outer wall (206) to form an annular container (201), the upper end of the annular container (201) is opened A water injection hole (204) and an exhaust hole (205) are provided, an upper baffle plate (202) is fixedly connected to the upper end of the annular container (201), and an upper end gap (203) is formed on the upper baffle plate (202). 4. The high temperature sensor according to claim 1, characterized in that, the inside of the housing (1) comprises a wire (101), an evaluation circuit (102), a diaphragm (103) and a high-voltage connector (104) , an evaluation circuit (102) is fixedly connected below the wire (101), a diaphragm (103) is fixedly connected below the evaluation circuit (102), and a high-voltage connector (104) is fixedly connected to the lower end of the diaphragm (103) .

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