CN217007104U

CN217007104U - Dissolved oxygen sensor

Info

Publication number: CN217007104U
Application number: CN202220683422.3U
Authority: CN
Inventors: 华凯峰; 汪丽艳
Original assignee: Foshan Yingwo Sensor Technology Co ltd
Current assignee: Foshan Yingwo Sensor Technology Co ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2022-07-19
Anticipated expiration: 2032-03-25

Abstract

The utility model relates to a dissolved oxygen sensor belongs to water environment detection area, including electrochemical reaction unit and circuit board subassembly, electrochemical reaction unit includes structure mounting, reaction assembly and electrolytic cell subassembly, and the sealed connection can be dismantled with the electrolytic cell subassembly to the structure mounting, reaction assembly locate between structure mounting and the electrolytic cell subassembly and with the electrolytic cell subassembly can be dismantled and be connected, electrolytic cell subassembly and circuit board subassembly sealed connection. The dissolved oxygen sensor has the advantages of high modularization degree, good stability, strong practicability, small pollution, simple structure and easy maintenance.

Description

Dissolved oxygen sensor

Technical Field

The disclosure relates to the technical field of water environment detection, in particular to a dissolved oxygen sensor.

Background

Dissolved oxygen refers to the free oxygen in the water body, or the amount dissolved in water, generally expressed as DO in mg/L. The dissolved oxygen parameter is used as an index of a water body, and is mostly applied to industries needing environmental detection, such as aquaculture, hydrological monitoring, sewage treatment and the like, and taking aquaculture as an example, the insufficient dissolved oxygen can cause harmful substances such as ammonia nitrogen, sub-salt, hydrogen sulfide and the like to be generated; most pathogenic bacteria are also easy to propagate in a large amount in the environment; above all, when the dissolved oxygen in the water body is lower than 4mg/L, the physiological activities of the cultivated organisms are inhibited and even the death of the organisms occurs.

Present dissolved oxygen sensor is because electrode material, sensor structure, electrolyte fill scheduling problem, mostly all only remain the mobile installation who fills the electrolyte accessory, but has appeared damaging when other parts of dissolved oxygen sensor, because the characteristics of integrated nature, then must wholly maintain to the life-span of dissolved oxygen sensor has been reduced, makes use cost promote.

SUMMERY OF THE UTILITY MODEL

To solve the technical problem described above or at least partially solve the technical problem described above, the present disclosure provides a dissolved oxygen sensor.

The utility model provides a dissolved oxygen sensor, including electrochemical reaction unit and circuit board subassembly, its characterized in that, electrochemical reaction unit includes structure mounting, reaction unit and electrolytic cell subassembly, and the structure mounting can be dismantled sealing connection with the electrolytic cell subassembly, reaction unit locate between structure mounting and the electrolytic cell subassembly and with the electrolytic cell subassembly can be dismantled and be connected, electrolytic cell subassembly and circuit board subassembly sealing connection.

The structure body fixing piece is provided with an internal thread structure, and one end of the electrolytic cell component is provided with an external thread structure corresponding to the internal thread of the structure body fixing piece; the inside of the other end of the electrolytic cell component is provided with an internal thread structure, and the circuit board component is provided with an external thread structure which corresponds to the internal thread structure of the electrolytic cell component.

Wherein, the electrolytic cell component is externally provided with a positioning hole which is used for being matched with an external tool to clamp and position the dissolved oxygen sensor.

The reaction assembly comprises a pressing piece, a cathode electrode and an oxygen permeation membrane, wherein one end of the cathode electrode penetrates through the pressing piece and is connected with the oxygen permeation membrane; the other end of the cathode electrode is inserted into the cavity of the electrolytic cell assembly.

The pressing piece comprises a circular ring, a sealing gasket and a convex ring, the circular ring, the sealing gasket and the convex ring are tightly pressed together, and the edge of the oxygen permeable membrane is tightly pressed between the circular ring and the sealing gasket; the convex ring is positioned at the lowest part of the reaction assembly and is contacted with the inner wall of the cavity of the electrolytic cell assembly, and the convex ring is used for ensuring the pressing tightness of the oxygen permeable membrane.

The electrolytic cell assembly further comprises an anode electrode, the upper half part of the cavity of the electrolytic cell assembly is filled with electrolyte solution, and the anode electrode is immersed in the electrolyte solution and fixed inside the cavity of the electrolytic cell assembly.

The measuring circuit is fixed by glue in the cavity of the circuit board assembly and is electrically connected with the cathode electrode.

Wherein the electrolytic cell assembly includes a temperature sensor mounted within the electrolytic cell assembly cavity, the electrolytic cell assembly housing having an opening to enable the temperature sensor to measure the temperature of the external environment.

The electrolytic cell assembly further comprises a protection piece, the protection piece comprises a top cover, the top cover comprises an internal thread, the internal thread is matched with the external thread on the structure fixing piece so that the top cover is connected to the structure fixing piece, one or more water inlets are formed in the side face of the top cover and used for introducing external water into the electrolytic cell assembly, one or more fixing ports are formed in the top face of the top cover, and the fixing ports are used for fixing the whole dissolved oxygen sensor by external equipment.

Wherein the protector further comprises a tail cap having threads that mate with internal threads of a circuit board assembly to connect the tail cap to the circuit board assembly.

The dissolved oxygen sensor is simple in structure, provided with the electrochemical reaction unit, the circuit board assembly and the protection piece, and the devices are connected in a thread twisting mode, so that the dissolved oxygen sensor is convenient to carry and mount; due to the separation of the functional modules, the dissolved oxygen sensor has low coupling, high stability and strong practicability, the sustainability and flexibility of the device are improved, the service life of the dissolved oxygen sensor is prolonged, and the equipment maintenance cost is effectively reduced; the shell of the circuit board component is provided with a positioning hole, the positioning hole can play a role in identifying the form of the dissolved oxygen sensor by a production machine during production, and the positioning hole can be used for facilitating the clamping, processing, assembly and use of the production machine; the temperature sensor is arranged near the opening of the shell of the electrolytic cell component in the dissolved oxygen sensor, so that the temperature measurement is accurate; because the pressing action of the pressing piece on the oxygen permeable membrane and the thread tight connection relationship of the structural body fixing piece and the electrolytic cell assembly, the dissolved oxygen sensor has good tightness, thereby avoiding the pollution of the outflow of the internal electrolyte to the environment.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a dissolved oxygen sensor according to an embodiment of the present disclosure;

FIG. 2 is a front view of a dissolved oxygen sensor according to an embodiment of the present disclosure;

FIG. 3 is a rear view of a dissolved oxygen sensor according to an embodiment of the present disclosure;

FIG. 4 is a top view of a dissolved oxygen sensor according to an embodiment of the present disclosure;

fig. 5 is a bottom view of a dissolved oxygen sensor according to an embodiment of the present disclosure.

Wherein, 1, a top cover; 101. a fixed port; 102. a water inlet; 2. a structure body fixing member; 201. fixing threads; 202. sealing the threads; 3. a reaction assembly; 301. a circular ring; 302. a gasket; 303. an oxygen permeable membrane; 304. a convex ring; 305. a cathode electrode; 4. an electrolytic cell assembly; 5. a temperature sensor; 6. a circuit board assembly; 7. a tail cover; 8. and (7) positioning the holes.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

Fig. 1 is a schematic structural diagram of a dissolved oxygen sensor according to an embodiment of the present disclosure, and as shown in the figure, the dissolved oxygen sensor includes a protection member, an electrochemical reaction unit, and a circuit board assembly 6, wherein the electrochemical reaction unit includes a structure fixing member 2, a reaction assembly 3, and an electrolytic cell assembly 4.

As shown in fig. 1 and 4, the protecting member includes a top cover 1 and a tail cover 7, the top cover 1 is a hollow cylinder, and the upper portion of the top cover has 3 fixing openings 101, in other embodiments, the number of the fixing openings 101 may be any number; the fixing port 101 is used for fixing the dissolved oxygen sensor to an external device, such as a rope or a wire rope, to lift the dissolved oxygen sensor around the fixing port 101 and place the dissolved oxygen sensor at a certain height position in the water body. The top cover 1 has 3 water inlets 102 on the side, and the number of the water inlets 102 is 3, so that the water in the external environment can easily flow into the dissolved oxygen sensor, in other embodiments, the number of the water inlets 102 can be any number, and the water inlets 102 are used for guiding the water in the external water environment into the dissolved oxygen sensor for further analysis and treatment. The inner lower end of the top cover 1 is provided with a fixing thread 201 corresponding to the structure fixing member 2, in this embodiment, the fixing thread 201 is tightly matched to enable the top cover 1 to be tightly connected with the structure fixing member 2, the connection between the top cover 1 and the structure fixing member 2 is detachable, in other embodiments, the fixing thread 201 may be another structure, such as a groove structure or a snap structure, but the final effect is to still detachably tightly connect the top cover 1 and the structure fixing member 2 together.

As shown in fig. 1 and 5, the tail cap 7 is at the bottom end of the dissolved oxygen sensor and has a through opening, which in this embodiment is circular, but in other embodiments may be any shape. The tail cap 7 is tightly connected with the lower end of the circuit board assembly 6. Both the top cover 1 and the tail cover 7 play a role in protection, and liquid leakage and sealing failure caused by impact of two ends of the dissolved oxygen sensor can be prevented. Further, the tail cap 7 can also prevent the damage of internal elements caused by the entry of aquatic organisms in the water body from the bottom end of the dissolved oxygen sensor. The tail cover 7 is in a circular truncated cone shape, and a concave part of the circular truncated cone is provided with a thread structure which is matched with the lower internal thread of the circuit board assembly 6, so that the tail cover 7 can be fixed on the circuit board assembly 6.

The structure fixing member 2 is a hollow cylinder in this embodiment, and is divided into 2 parts in the drawing only for convenience of understanding the structure and the corresponding relationship, and the structure fixing member 2 is an integral part in this embodiment. The structure fixing member 2 has a fixing thread 201 corresponding to the top cover 1 at the upper outer end and a sealing thread 202 corresponding to the upper outer end of the electrolytic cell module 4 at the inner end so that the structure fixing member 2 is tightly connected to the electrolytic cell module 4, the structure fixing member 2 and the electrolytic cell module 4 are detachably connected, and the sealing thread 202 may have another structure in other embodiments, such as a groove structure or a snap structure, and the final effect is still to detachably tightly connect the structure fixing member 2 to the electrolytic cell module 4.

The reaction module 3 comprises a pressed piece, a cathode electrode 305 and an oxygen permeable membrane 303, and the pressed piece comprises a circular ring 301, a convex ring 304 and a sealing gasket 302. The reaction block 3 is located inside the structure holder 2 in this embodiment, and further, it is located in the upper half of the electrolytic cell block 4, the cathode 305 is cylindrical, and its exterior is covered by a protective material, in this embodiment, the protective material is plastic, in other embodiments, the protective material can be any material that can not react with the general acidic semi-solid electrolyte and the cathode, and the protective material can prevent the dissolved oxygen sensor from being damaged. The lower end of the cathode electrode 305 contains a lead wire drawn out to transmit the current to the outside. In this embodiment, the middle portions of the circular ring 301, the sealing pad 302 and the convex ring 304 have the same size of through opening, the circular ring 301, the sealing pad 302 and the convex ring 304 are arranged from top to bottom, the cathode electrode 305 is inserted through the through opening, and the diameter of the cathode electrode 305 is just equal to the diameter of the through opening, so that the cathode electrode 305, the circular ring 301, the sealing pad 302 and the convex ring 304 are detachably and tightly connected together. The oxygen permeable membrane 303 is an elastic membrane, and can be partially deformed, the center of the oxygen permeable membrane 303 covers the upper end of the cathode electrode 305 and is in full contact with the cathode electrode 305, in other embodiments, the oxygen permeable membrane 303 and the cathode electrode 305 may not be in contact, but the measurement effect is poor, and the measured dissolved oxygen content data is inaccurate. The edge of the oxygen permeable membrane 303 is clamped between the circular ring 301 and the sealing gasket 302 and is fixed by the circular ring 301 and the sealing gasket 302, and the oxygen permeable membrane 303 withstands water of external water environment and only allows oxygen to pass through. In this embodiment, the upper end of the cathode electrode 305 is in a spherical shape, which increases the reaction area between the cathode electrode 305 and oxygen, so that the detection data is more accurate, and the spherical shape is not easy to damage the structure of the oxygen permeable membrane 303, so the service life of the oxygen permeable membrane 303 is also prolonged, in other embodiments, the upper end of the cathode electrode 305 may be in any shape, such as a cube, a cylinder, etc. In addition, the cathode electrode 305, the ring 301, the sealing gasket 302 and the convex ring 304 are detachably combined, so that the total replacement of the dissolved oxygen sensor is quicker, and the dissolved oxygen sensor can be quickly put into a working state again.

The combined structure of the cathode electrode 305, the circular ring 301, the oxygen permeable membrane 303, the convex ring 304 and the sealing gasket 302 is connected to the electrolytic cell assembly 4 through the lower part of the cathode electrode 305, the center of the electrolytic cell assembly 4 is provided with a cylindrical groove corresponding to the shape of the lower part of the cathode electrode 305, the middle of the cylindrical groove is provided with a hollow cylinder which penetrates through the whole electrolytic cell assembly 4, and the lower part of the cathode electrode 305 is tightly inserted into the groove so as to fix the combined structure of the cathode electrode 305, the circular ring 301, the oxygen permeable membrane 303, the convex ring 304 and the sealing gasket 302 in the electrolytic cell assembly 4. In addition, the upper half of the cell assembly 4 is filled with an acidic semi-solid electrolyte in which both the anode electrode and the cathode electrode 305 are immersed, the anode electrode being located at the bottom of the upper half of the cell assembly 4. In addition to the cylindrical trough structure described above, the upper half of the cell assembly 4 is completely separated from the lower half. The concave portion of the convex ring 304 contacts the inner wall of the upper half cavity of the electrolytic cell assembly 4, so that the electrolytic cell assembly 4 can be tightly pressed together to prevent electrolyte from flowing out to damage the environment due to the pressing and leakage of the oxygen permeable membrane 303.

The lower half part of the electrolytic cell component 4 is provided with a temperature sensor 5, and the shell of the lower half part of the electrolytic cell component 4 is provided with a notch, so that water in external water can flow into the lower half part of the electrolytic cell component 4, and further, the measurement of the water temperature is realized.

The cell assembly 4 is tightly connected to the circuit board assembly 6 by the lower half as shown in fig. 1, the connection in this embodiment is tightly connected by a screw rotation, the connection is not detachable after the assembly and filling, in other embodiments, the connection is not limited to a groove structure connection, and the final effect is to tightly connect the cell assembly 4 and the circuit board assembly 6.

A measuring circuit is arranged in the circuit board assembly 6 and is fixed in the circuit board assembly 6 by glue liquid, and the glue liquid has the effects of preventing water and ensuring the normal operation of the measuring circuit. One end of the measuring circuit is welded to the lead wire from the cathode electrode 305, and the other end leads out the lead wire and passes through the port of the tail cap 7 to the outside.

Fig. 2 is a front view of a dissolved oxygen sensor according to an embodiment of the present disclosure, which shows that a positioning hole 8 is formed at an upper portion of a housing of an electrolytic cell assembly 4, the positioning hole 8 is used for allowing a production device to determine a shape of the dissolved oxygen sensor for assembly line installation and manufacturing, and it is more convenient for a user to grasp and use the dissolved oxygen sensor, and the positioning hole 8 is not communicated with the inside of the electrolytic cell assembly 4. The positioning hole 8 is not limited to a rectangle and has any shape suitable for production use.

Fig. 3 is a side view of a dissolved oxygen sensor according to an embodiment of the present disclosure, and as shown in the figure, the positioning hole 8 shown in fig. 2 is also formed at the upper part of the electrolytic cell assembly 4, and the function thereof is described above and will not be described herein again. And a temperature sensor 5 is arranged below the positioning hole 8 and used for measuring the temperature of the external water body. The lead wire led out from the temperature sensor 5 passes through a placing groove in the cavity of the electrolytic cell assembly 4, is led to a measuring circuit of the circuit board assembly 6 through the placing groove, and then leads out from the measuring circuit to transmit temperature data to external equipment.

In the present embodiment, the operation principle of the dissolved oxygen sensor is as follows: the water of the external water body flows in from the water inlet 102 of the top cover 1, gathers at the ring 301 of the upper half part of the electrolytic cell component 4, and oxygen molecules in the water enter into the electrolyte through the oxygen permeable membrane 303 on the cathode electrode 305, in the present embodiment, the cathode electrode 305 is made of gold, the anode electrode is made of silver, in other embodiments, the cathode electrode 305 is active metal such as silver copper, and the anode electrode is active metal such as tin aluminum. Oxygen molecules permeating the oxygen permeable membrane 303 are reduced to hydroxide ions at the cathode and silver is oxidized to silver ions at the anode, and the chemical reaction creates a potential difference that causes electrons to move, producing an electric current. The current flows into a measuring circuit in the circuit board assembly 6 through a lead wire via the lower end of the cathode electrode 305, and the measuring circuit leads out the lead wire to lead the current to an external device from the through hole of the tail cover 7 to realize the detection and measurement of the dissolved oxygen.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description is only for the purpose of describing particular embodiments of the present disclosure, so as to enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dissolved oxygen sensor comprises an electrochemical reaction unit and a circuit board assembly, and is characterized in that the electrochemical reaction unit comprises a structure fixing piece, a reaction assembly and an electrolytic cell assembly, the structure fixing piece is detachably connected with the electrolytic cell assembly in a sealing mode, the reaction assembly is arranged between the structure fixing piece and the electrolytic cell assembly and detachably connected with the electrolytic cell assembly, and the electrolytic cell assembly is connected with the circuit board assembly in a sealing mode.

2. The dissolved oxygen sensor of claim 1, wherein the structure holder has an internal thread structure, and one end of the electrolytic cell module has an external thread structure corresponding to the internal thread structure of the structure holder; the inside of the other end of the electrolytic cell component is provided with an internal thread structure, and the circuit board component is provided with an external thread structure which corresponds to the internal thread structure of the electrolytic cell component.

3. The dissolved oxygen sensor of claim 1, wherein the electrolytic cell assembly has a locating hole on the exterior for cooperating with an external tool to grip and locate the dissolved oxygen sensor.

4. The dissolved oxygen sensor of claim 1, wherein the reaction assembly comprises a pressing member, a cathode electrode and an oxygen permeable membrane, one end of the cathode electrode penetrates through the pressing member and is connected with the oxygen permeable membrane; the other end of the cathode electrode is inserted into the cavity of the electrolytic cell assembly.

5. The dissolved oxygen sensor of claim 4, wherein the pressing member comprises a circular ring, a sealing gasket and a convex ring, the circular ring, the sealing gasket and the convex ring are tightly pressed together, and the edge of the oxygen permeable membrane is tightly pressed between the circular ring and the sealing gasket; the convex ring is positioned at the lowest part of the reaction assembly and is contacted with the inner wall of the cavity of the electrolytic cell assembly, and the convex ring is used for ensuring the pressing tightness of the oxygen permeable membrane.

6. The dissolved oxygen sensor of claim 5, wherein the cell assembly further comprises an anode electrode, the upper half of the cell assembly cavity is filled with an electrolyte solution, and the anode electrode is immersed in the electrolyte solution and fixed inside the cell assembly cavity.

7. The dissolved oxygen sensor of claim 6, wherein the circuit board assembly cavity is provided with a measuring circuit, the measuring circuit is fixed by glue solution in the circuit board assembly cavity, and the measuring circuit is electrically connected with the cathode electrode.

8. The dissolved oxygen sensor of claim 1, wherein the cell assembly comprises a temperature sensor mounted within a chamber of the cell assembly, the cell assembly housing having an opening to allow the temperature sensor to measure the temperature of the external environment.

9. The dissolved oxygen sensor of claim 1, further comprising a protection member, wherein the protection member comprises a top cover, the top cover is provided with an internal thread, the internal thread is matched with the external thread on the structure fixing member so that the top cover can be connected to the structure fixing member, the side surface of the top cover is provided with one or more water inlets, the water inlets are used for introducing external water into the electrolytic cell assembly, the top surface of the top cover is provided with one or more fixing ports, and the fixing ports are used for fixing the dissolved oxygen sensor integrally by external equipment.

10. The dissolved oxygen sensor of claim 9, wherein the protective member further comprises a tail cap, the tail cap having threads that mate with internal threads of a circuit board assembly to couple the tail cap to the circuit board assembly.