Gold electrode piezoelectric quartz crystal humidity sensor

Abstract

The utility model provides a gold electrode piezoelectric quartz crystal humidity sensor, which relates to the technical field of humidity sensors and comprises a heat insulation shell, a humidity sensor body is fixedly mounted in the heat insulation shell, an air cavity is arranged in the heat insulation shell, and a connecting wire is fixed at the tail end of the heat insulation shell. A protection assembly is installed on the surface of the connecting wire and comprises an installation box, the installation box is fixed to the surface of the connecting wire, eight sets of drying cylinders are installed in one end of the installation box at equal intervals, the drying cylinders are filled with drying cotton strips, and an air inlet pipe is arranged at the position, corresponding to one set of drying cylinders, of the outer side of the installation box. Compared with the prior art, the humidity sensor has the advantages that the protection assembly is communicated with the heat insulation shell, air flow around the humidity sensor is achieved, the humidity sensor is dry, the temperature is reduced, meanwhile, the gold electrode is prevented from being corroded by wet gas, and the humidity sensor body in the heat insulation shell is well protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of humidity sensor, concretely to a gold electrode piezoelectric quartz crystal humidity sensor. BACKGROUND

[0002] Piezoelectric sensor is a kind of sensor based on piezoelectric effect.It is a kind of self-powered and electromechanical conversion sensor.The sensitive element of it is made of piezoelectric material.The surface of piezoelectric material generates electric charge after being stressed.This electric charge is amplified and impedance-converted by charge amplifier and measurement circuit to become electric quantity output proportional to the external force.Piezoelectric sensor is used to measure force and non-electric physical quantity that can be converted into electricity.Its advantages are wide frequency band, high sensitivity, high signal-to-noise ratio, simple structure, reliable operation and light weight, etc.The disadvantage is that some piezoelectric materials need moisture-proof measures, and the output direct current response is poor, which needs to use high input impedance circuit or charge amplifier to overcome this defect.

[0003] Patent CN119334821B proposes a quartz crystal microbalance humidity sensor, a preparation method thereof and a monitoring system.Copper is deposited on the surface of the crystal oscillator electrode on one side of the quartz crystal microbalance, and copper hydroxide is etched to form a copper oxide material as a humidity sensitive layer after adjusting the heat treatment conditions.The temperature of heat treatment has a significant impact on the ratio of adsorbed oxygen to lattice oxygen of copper oxide, i.e.oxygen vacancies, and the time of heat treatment significantly affects the adsorption of water molecules by copper oxide.The sensor prepared based on suitable heating temperature and time has higher response and sensitivity for humidity detection, which can significantly outperform the copper hydroxide-based sensor without heat treatment.

[0004] Gold electrodes are also used to prepare sensors in the prior art.The advantage of this structure is that gold electrodes piezoelectric quartz crystal uses gold as electrode material, which has higher conductivity, chemical stability and corrosion resistance compared with traditional silver electrodes, but long-term exposure to high temperature and high humidity environment can easily cause oxidation and corrosion of the surface of gold electrodes. UTILITY MODEL CONTENT

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a gold electrode piezoelectric quartz crystal humidity sensor to solve the problems raised in the background art.The utility model has a novel structure, which realizes the air flow around the humidity sensor through the communication between the protection assembly and the heat insulation shell, and is dry, reduces the temperature and avoids the corrosion of gold electrodes caused by humid gas, better protects the humidity sensor body inside the heat insulation shell.

[0006] In order to achieve the above object, the utility model discloses a gold electrode piezoelectric quartz crystal humidity sensor, including the heat -proof shell, the heat -proof shell's inside fixed mounting has humidity sensor body, and the heat -proof shell inside is provided with the air cavity, the tail of heat -proof shell is fixed with connecting wire, the surface on connecting wire is installed with protection assembly, the protection assembly includes installation box, the installation box is fixed on the surface of connecting wire, eight sets of drying cylinder are installed equidistantly in installation box one end inside, and drying cylinder is filled with dry cotton strip inside, the position of one set of drying cylinder is provided with the air inlet pipe on the outside of installation box, and the fan is installed in the air inlet pipe, the one side of heat -proof shell rear end is provided with the air inlet, and the other side of heat -proof shell rear end is provided with the air outlet, the air inlet and air outlet all are fixed with the hose, the hose is connected with installation box, and the inner wall on installation box is installed with semiconductor refrigerating plate.

[0007] Further, the protection assembly further includes a sealing ring, the outer surface of the drying cylinder is fixed with the sealing ring, and the sealing ring is rotatably installed in the installation box.

[0008] Further, the rear end of the drying cylinder is fixed with a gear ring, the upper end of the gear ring is engaged with a gear, the installation box is fixed with a drive motor corresponding to the position of the gear, and the output end of the drive motor is fixedly connected with the gear.

[0009] Further, the tail end of the drying cylinder is fixed with a gas collection cavity in the installation box, and the gas collection cavity is provided with a connecting port corresponding to the tail end of one set of drying cylinder, and the other side of the gas collection cavity is fixedly connected with the hose of the air inlet.

[0010] Further, the last end of the installation box is fixed with a delivery cavity, and the delivery cavity is fixedly connected with the hose of the air outlet, the delivery cavity is fixedly connected with the hose of the air outlet, the delivery cavity is fixedly connected with the hose of the air outlet, and the delivery cavity is fixedly connected with the hose of the air outlet.

[0011] Further, one end of the connecting pipe is connected with the air outlet pipe, and the hose of the air outlet is connected between the connecting pipe and the air outlet pipe, the piston plate is slidably installed in the air outlet pipe and the connecting pipe, one end of the piston plate is connected with the inner wall of the connecting pipe through the spring, and the other end of the piston plate is fixedly connected with the pull rope.

[0012] Further, the bottom of the air outlet pipe is rotatably installed with a rotating plate through a rotating shaft and a torsion spring, and the pull rope is fixedly connected with the rotating plate.

[0013] Further, the pressure rod is equidistantly fixed on the outer surface of the installation box, and the pressure rod is alternately in extrusion contact with the rotating plate.

[0014] The utility model has the advantages that:

[0015] 1. The utility model discloses a sealing ring is installed dry cylinder, and the position of dry cylinder rotation switching can be shielded to the air inlet pipe in the process of meeting the sealing ring, prevent gas from being directly sent into the installation box inside, drive motor drive gear rotation and the meshing of ring, dry cylinder switching uses, keep and the connection of gas collection cavity can send into the heat -proof shell inside, the purpose of switching use lies in keeping its dry processing ability, avoid high humidity environment influence humidity sensor's gold electrode.

[0016] 2. The utility model discloses with the rotation of ring, the pressing rod alternation and the surface extrusion of rotation board, when rotation board is extruded and rotates downward, pull the rope and pull the piston plate to move outward, to switch the connection of air outlet to the connecting pipe, send the gas in the inside of send-out chamber to send into the gas collection cavity, because send-out chamber can also reduce the internal air temperature, after sending into the inside of gas collection cavity, can further reduce the temperature, when sending into the heat -proof shell inside, play better high temperature protection effect, after the pressing rod is separated from the extrusion of rotation board, the piston plate resets through the spring of rear end, and send-out chamber continues with send-out pipe connection, and gas is directly discharged.

[0017] 3. The utility model discloses relative to prior art, through the communication of protection assembly and heat -proof shell, realize the air flow around humidity sensor, and dry, reduce temperature's while avoiding humid gas to cause gold electrode to be corroded, better protection to the humidity sensor body of heat -proof shell inside. ACCURACY

[0018] Figure 1 It is the whole front structure schematic drawing of gold electrode piezoelectric quartz crystal humidity sensor of the utility model;

[0019] Figure 2 It is the protection assembly and humidity sensor body connection schematic drawing of gold electrode piezoelectric quartz crystal humidity sensor of the utility model;

[0020] Figure 3 It is the installation box outside structure schematic drawing of gold electrode piezoelectric quartz crystal humidity sensor of the utility model;

[0021] Figure 4 It is the installation box inside structure schematic drawing of gold electrode piezoelectric quartz crystal humidity sensor of the utility model;

[0022] Figure 5 It is the dry cylinder inside structure schematic drawing of gold electrode piezoelectric quartz crystal humidity sensor of the utility model;

[0023] Figure 6 It is the connecting pipe and air outlet pipe inside schematic drawing of gold electrode piezoelectric quartz crystal humidity sensor of the utility model.

[0024] In the figure: 1, heat insulation shell; 11, humidity sensor body; 12, connecting line; 13, air inlet; 14, air outlet; 15, hose; 2, protection assembly; 21, mounting box; 22, air inlet pipe; 23, fan; 24, gear ring; 25, gear; 26, drive motor; 27, pressure rod; 28, air outlet pipe; 29, drying cylinder; 210, air collecting cavity; 211, delivery cavity; 212, connecting pipe; 213, drying cotton; 214, sealing ring; 215, piston plate; 216, pull rope; 217, rotating plate. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0026] Please refer to Figures 1 to 6 The utility model provides a technical scheme: a gold electrode piezoelectric quartz crystal humidity sensor, including heat insulation shell 1, humidity sensor body 11 is fixedly installed in the inside of heat insulation shell 1, and heat insulation shell 1 is provided with air cavity inside, the tail end of heat insulation shell 1 is fixed with connecting line 12, protection assembly 2 is installed on the surface of connecting line 12, protection assembly 2 includes mounting box 21, mounting box 21 is fixed on the surface of connecting line 12, eight sets of drying cylinders 29 are equidistantly installed in the inside of mounting box 21 one end, and drying cotton 213 is filled in the inside of drying cylinder 29, air inlet pipe 22 is set up on the position of one set of drying cylinder 29 of mounting box 21 outside, and fan 23 is installed in the inside of air inlet pipe 22, the side of the rear end of heat insulation shell 1 is provided with air inlet 13, and the other side of the rear end of heat insulation shell 1 is provided with air outlet 14, the air inlet 13 and air outlet 14 are all fixed with hose 15, the hose 15 is connected with mounting box 21, and semiconductor refrigeration plate is installed on the inner wall of mounting box 21, in the scheme, the main structure of humidity sensor body 11 is same with CN119334821B, still including gold electrode plate and piezoelectric crystal layer, wherein the whole is installed in the inside of heat insulation shell 1, carries out preliminary heat insulation moisture protection through heat insulation shell 1, connects protection assembly 2 and heat insulation shell 1 through hose 15, utilizes the purpose of air flow cooling and drying, reduces the temperature and gas humidity in heat insulation shell 1, further avoids the corrosion of gold electrode in high temperature and high humidity environment.

[0027] The protection assembly 2 also includes a sealing ring 214 in this embodiment, the sealing ring 214 is fixed on the outer surface of the drying cylinder 29 and is rotatably installed inside the installation box 21, the sealing ring 214 is in contact with the air inlet pipe 22, the rear end of the drying cylinder 29 is fixed with a tooth ring 24, the upper end of the tooth ring 24 is engaged with a gear 25, the installation box 21 is fixed with a driving motor 26 corresponding to the position of the gear 25, and the output end of the driving motor 26 is fixedly connected with the gear 25, the tail end of the drying cylinder 29 is fixed with a gas collecting cavity 210 inside the installation box 21, and the gas collecting cavity 210 is provided with a connecting port corresponding to the position of one group of tail ends of the drying cylinder 29, and the other side of the gas collecting cavity 210 is fixedly connected with the hose 15 of the air inlet 13. The drying cylinder 29 is installed through the sealing ring 214, and the position of the sealing ring 214 encountered during the rotation switching of the drying cylinder 29 can block the air inlet pipe 22 to prevent the gas from being directly sent into the inside of the installation box 21. The driving motor 26 drives the gear 25 to rotate and engage with the tooth ring 24, the drying cylinder 29 is switched for use, and the connection with the gas collecting cavity 210 can be sent into the heat insulation shell 1. The purpose of switching use is to maintain the drying treatment ability, avoid the influence of high humidity environment on the gold electrode of the humidity sensor, and the drying cotton strip 213 in the drying cylinder 29 can be replaced regularly or replaced with renewable drying materials, because the rotation of the drying cylinder 29 itself is not a continuous process, and a certain time is needed for switching.

[0028] The last end of the mounting box 21 is fixed with a sending cavity 211, and the sending cavity 211 is fixedly connected with the hose 15 of the air outlet 14, the side of the sending cavity 211 towards the air collecting cavity 210 is fixed with a connecting pipe 212, and the connecting pipe 212 is in communication with the inside of the air collecting cavity 210, the outside of the sending cavity 211 is fixed with an air outlet pipe 28, and the air outlet pipe 28 penetrates the mounting box 21, one end of the connecting pipe 212 is connected with the air outlet pipe 28, and the hose 15 of the air outlet 14 is connected between the connecting pipe 212 and the air outlet pipe 28, the inside of the air outlet pipe 28 and the connecting pipe 212 is slidably installed with a piston plate 215, one end of the piston plate 215 is connected with the inner wall of the connecting pipe 212 through a spring, and the other end of the piston plate 215 is fixed with a pull rope 216, the bottom of the air outlet pipe 28 is rotatably installed with a rotating plate 217 through a rotating shaft and a torsion spring, the pull rope 216 is fixedly connected with the rotating plate 217, the pressure rod 27 is equidistantly fixed on the outer surface of the mounting box 21, and the pressure rod 27 is alternatively in extrusion contact with the rotating plate 217, the air collecting cavity 210 and the sending cavity 211 in the paper adopt technical materials with good heat exchange capacity, so that the gas sent in or out can be reduced in temperature by the semiconductor refrigeration plate inside the mounting box 21, with the rotation of the gear ring 24, the pressure rod 27 is alternatively extruded with the surface of the rotating plate 217, when the rotating plate 217 is extruded and rotates downward, the pull rope 216 pulls the piston plate 215 to move outward, so as to switch the connection of the air outlet 14 to the connecting pipe 212, the gas in the sending cavity 211 is sent into the air collecting cavity 210, because the sending cavity 211 also reduces the temperature of the air inside, after being sent into the air collecting cavity 210, the temperature can be further reduced, so as to play a better high temperature protection effect when being sent into the heat insulation shell 1, after the pressure rod 27 is extruded with the rotating plate 217, the piston plate 215 is reset through the spring at the rear end, the sending cavity 211 continues to be connected with the sending pipe, and the gas is directly discharged.

[0029] The primary moisture-proof and heat insulation protection is realized by the heat insulation shell 1, the drying cylinder 29 is installed by the sealing ring 214, and the position of the sealing ring 214 encountered during the rotation switching of the drying cylinder 29 can shield the air inlet pipe 22, preventing the gas from being directly sent into the inside of the installation box 21, the gear 25 is driven by the driving motor 26 to rotate and engage with the gear ring 24, the drying cylinder 29 is switched for use, and the connection with the gas collecting cavity 210 can be sent into the inside of the heat insulation shell 1, and the purpose of switching use is to maintain the drying treatment capacity and avoid the influence of the high humidity environment on the gold electrode of the humidity sensor, the protective assembly 2 and the heat insulation shell 1 are connected by the hose 15, the air flow cooling and drying purposes are utilized, the temperature and gas humidity in the heat insulation shell 1 are reduced, the corrosion of the gold electrode caused by the high temperature and high humidity environment is further avoided, and then the gas sent in or out can be reduced in temperature by the semiconductor refrigerating plate in the inside of the installation box 21, with the rotation of the gear ring 24, the pressing rod 27 is alternately pressed against the surface of the rotating plate 217, when the rotating plate 217 is pressed downward, the pull rope 216 pulls the piston plate 215 to move outward, so that the connection of the gas outlet 14 is switched to the connecting pipe 212, the gas in the sending-out cavity 211 is sent into the gas collecting cavity 210, because the sending-out cavity 211 also reduces the internal air temperature, after being sent into the gas collecting cavity 210, the temperature can be further reduced, so that when the gas is sent into the inside of the heat insulation shell 1, a better high temperature protection effect is achieved, after the pressing rod 27 is separated from the pressing effect of the rotating plate 217, the piston plate 215 is reset by the spring at the rear end, and the sending-out cavity 211 continues to be connected with the sending-out pipe, so that the gas is directly discharged.

[0030] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, and for those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic characteristics of the present application.

[0031] In addition, it should be understood that, although the present application is described in the form of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gold electrode piezoelectric quartz crystal humidity sensor, comprising a heat-insulating housing (1), characterized in that: A humidity sensor body (11) is fixedly installed inside the heat insulation shell (1), and an air cavity is provided inside the heat insulation shell (1). A connecting wire (12) is fixed to the tail end of the heat insulation shell (1), and a protective component (2) is installed on the surface of the connecting wire (12). The protective component (2) includes a mounting box (21), which is fixed to the surface of the connecting wire (12). Eight drying cylinders (29) are equidistantly installed inside one end of the mounting box (21), and the drying cylinders (29) are filled with drying cotton strips (2). 13) An air inlet pipe (22) is provided on the outside of the mounting box (21) corresponding to one of the drying cylinders (29), and a fan (23) is installed inside the air inlet pipe (22). An air inlet (13) is provided on one side of the rear end of the heat insulation shell (1), and an air outlet (14) is provided on the other side of the rear end of the heat insulation shell (1). Both the air inlet (13) and the air outlet (14) are fixed with hoses (15). The hoses (15) are connected to the mounting box (21), and a semiconductor cooling plate is installed on the inner wall of the mounting box (21).

2. The gold electrode piezoelectric quartz crystal humidity sensor according to claim 1, characterized in that: The protective component (2) also includes a sealing ring (214), which is fixed on the outer surface of the drying cylinder (29) and is rotatably installed inside the mounting box (21). The sealing ring (214) is in contact with the air inlet pipe (22).

3. The gold electrode piezoelectric quartz crystal humidity sensor according to claim 2, characterized in that: The rear end of the drying cylinder (29) is fixed with a toothed ring (24), and the upper end of the toothed ring (24) is meshed with a gear (25). The mounting box (21) is fixed with a drive motor (26) at the position corresponding to the gear (25), and the output end of the drive motor (26) is fixedly connected to the gear (25).

4. The gold electrode piezoelectric quartz crystal humidity sensor according to claim 3, characterized in that: The mounting box (21) has a gas collecting chamber (210) fixed inside the drying cylinder (29) at the tail end. The gas collecting chamber (210) is provided with a connection port corresponding to the tail end of one of the drying cylinders (29). The other side of the gas collecting chamber (210) is fixedly connected to the hose (15) of the air inlet (13).

5. A gold electrode piezoelectric quartz crystal humidity sensor according to claim 4, characterized in that: The rear end of the mounting box (21) is fixed with a delivery chamber (211), and the delivery chamber (211) is fixedly connected to the hose (15) of the air outlet (14). The delivery chamber (211) is fixed with a connecting pipe (212) on the side facing the air collection chamber (210), and the connecting pipe (212) communicates with the inside of the air collection chamber (210). The delivery chamber (211) is fixed with an air outlet pipe (28) on the outside, and the air outlet pipe (28) passes through the mounting box (21).

6. A gold electrode piezoelectric quartz crystal humidity sensor according to claim 5, characterized in that: One end of the connecting pipe (212) is connected to the air outlet pipe (28), and the hose (15) of the air outlet (14) is connected between the connecting pipe (212) and the air outlet pipe (28). A piston plate (215) is slidably installed inside the air outlet pipe (28) and the connecting pipe (212). One end of the piston plate (215) is connected to the inner wall of the connecting pipe (212) by a spring, and the other end of the piston plate (215) is fixed with a pull rope (216).

7. A gold electrode piezoelectric quartz crystal humidity sensor according to claim 6, characterized in that: The bottom of the air outlet pipe (28) is rotatably mounted with a rotating plate (217) via a rotating shaft and a torsion spring, and the pull rope (216) is fixedly connected to the rotating plate (217).

8. A gold electrode piezoelectric quartz crystal humidity sensor according to claim 7, characterized in that: The toothed ring (24) is fixed with pressure rods (27) at equal intervals on the outer surface of the mounting box (21), and the pressure rods (27) alternately press against the rotating plate (217).

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