CN217587024U

CN217587024U - Dissolved oxygen detection sensor

Info

Publication number: CN217587024U
Application number: CN202222000673.XU
Authority: CN
Inventors: 周慧平; 李慧云
Original assignee: Beijing Central Blue Technology Co ltd
Current assignee: Beijing Central Blue Technology Co ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2022-10-14
Anticipated expiration: 2032-08-01

Abstract

The utility model discloses a dissolved oxygen detects sensor, include: the sensor comprises a sensor body, a sensor body and a sensor body, wherein the bottom end of the sensor body is provided with a breathable film; the guard shield, its is sealed can dismantle and locates the sensor body bottom forms the cover and establishes the protection chamber of ventilated membrane, the guard shield bottom is run through and is had end through-hole, the guard shield bottom is located end through-hole circumference and caves in and has the mounting groove, set gradually end filter screen, lower packing ring, lower helicoid along the direction of keeping away from end through-hole in the mounting groove, wherein, lower helicoid periphery with mounting groove inner wall spiro union, lower packing ring, lower helicoid have with the coaxial, isometric lower perforation of end through-hole. The utility model discloses have bottom filter screen, ventilated membrane and all can dismantle the setting, be convenient for wash, change, improve sensor life's beneficial effect.

Description

Dissolved oxygen detection sensor

Technical Field

The utility model relates to a dissolved oxygen detects technical field. More specifically, the present invention relates to a dissolved oxygen detection sensor.

Background

Water is one of the most common substances on the earth and is an important resource for production and living of people, in recent years, the development and utilization of water resources are more and more extensive, meanwhile, the monitoring of water quality is more and more urgent, and among numerous water quality monitoring parameters, the detection of dissolved oxygen is more important for water bodies, especially in the processes of aquaculture, environmental protection monitoring and sewage treatment.

The detection of the dissolved oxygen has two paths of indirect calculation by an iodometric method and direct detection by a dissolved oxygen sensor, which are commonly used at present, and the method for directly detecting the dissolved oxygen by the sensor is convenient, simple and accurate, so that the method becomes the mainstream method for detecting the dissolved oxygen at present. Among them, the primary cell type dissolved oxygen sensor is used in large quantities in practical environments because of its advantages of no need of preheating, no need of providing bias voltage, low power consumption, etc. during detection. According to the working principle of an electrochemical primary cell, oxygen molecules dissolved in water are reduced on a cathode through a breathable film, a corresponding metal anode is oxidized to generate a current signal, wherein the current is in direct proportion to the concentration of dissolved oxygen, and the concentration of the dissolved oxygen in the water is judged according to the current. The air-permeable membrane forms a barrier between the water body to be detected and the electrolyte, and when the air-permeable membrane is directly exposed in the water body environment, the air-permeable membrane is inevitably influenced by impurities in the water body in the detection process.

Among the prior art, locate the ventilated membrane circumference through the guard shield cover of installing the filter screen usually, form the protection to the ventilated membrane, nevertheless it has filter screen and guard shield fixed setting, the difficult problem of wasing, changing of filter screen.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.

The utility model discloses still another purpose provides a dissolved oxygen detects sensor, end filter screen passes through lower helicoid cooperation mounting groove for the guard shield, realizes dismantling the setting, and the end filter screen of being convenient for washs, changes.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a dissolved oxygen detection sensor including:

a sensor body having a gas permeable membrane at a bottom end thereof;

the guard shield, its is sealed can dismantle and locates the sensor body bottom forms the cover and establishes the protection chamber of ventilated membrane, the guard shield bottom is run through and is had end through-hole, the guard shield bottom is located end through-hole circumference and caves in and has the mounting groove, set gradually end filter screen, lower packing ring, lower helicoid along the direction of keeping away from end through-hole in the mounting groove, wherein, lower helicoid periphery with mounting groove inner wall spiro union, lower packing ring, lower helicoid have with the coaxial, isometric lower perforation of end through-hole.

Preferably, the sensor body includes:

the liquid storage shell is cylindrical with an open top end, an upper mounting groove is formed in the inner circumference of the top end of the liquid storage shell in a recessed mode, a lower mounting groove is formed in the outer circumference of the bottom end of the liquid storage shell in a recessed mode, the protective cover is cylindrical with an open top end, a lower mounting portion matched with the lower mounting groove extends upwards from the outer circumference of the top end of the protective cover, and the lower mounting portion is in threaded connection with the lower mounting groove;

go up the lid, it have with go up the installation department that the mounting groove matches, go up the installation department with go up the mounting groove spiro union so that go up lid cooperation stock solution shell and form the stock solution chamber that holds electrolyte, it is provided with negative pole, positive pole in the stock solution intracavity to go up the lid bottom.

Preferably, the guard shield is along the sunken annular groove that has of circumference, the annular groove along the circumference interval run through have with the side through-hole of protection chamber intercommunication, from interior to exterior sets up side filter screen, elastic ring in the annular groove, the elastic ring location the side filter screen just runs through the show hole that has with side through-hole one-to-one.

Preferably, the number of the side through holes is 2 to 4.

Preferably, the side through hole is a round hole, the display hole is a long waist hole with two ends, and the width of the display hole is equal to the diameter of the side through hole.

Preferably, store up liquid shell bottom with the stock solution chamber link up the rigid coupling and has the guide cylinder, the inside condensation in guide cylinder inside wall top forms and keeps off the ring, keep off the ring internal periphery and have a fender section of thick bamboo towards the extension of end filter screen to cooperation guide cylinder becomes the seal groove, set up the sealing washer in the seal groove, set gradually ventilated membrane, upper gasket, last helicoid along the direction of keeping away from the sealing washer, wherein, go up the helicoid periphery with guide cylinder inner wall spiro union, upper gasket, go up the helicoid have with coaxial, the equal footpath of sealing washer is perforated.

Preferably, a polytetrafluoroethylene layer is arranged at one end of the upper gasket opposite to the upper coil.

The utility model discloses at least, include following beneficial effect:

end filter screen, ventilated membrane all can be dismantled and set up, are convenient for wash, change, improve sensor life, and is further, set up the side through-hole at the guard shield lateral part, and the setting of cooperation side filter screen improves the exchange speed of protection chamber and external environment, and is further, set up the side through-hole at the guard shield lateral part, and the setting of cooperation side filter screen improves the exchange speed of protection chamber and external environment, the guide cylinder sets up to extend downwards for the liquid storage shell, is convenient for when changing the ventilated membrane, inverts so that bubble-free installation between ventilated membrane and electrolyte.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is an explosion structure diagram of a dissolved oxygen detection sensor according to one embodiment of the present invention;

fig. 2 is a schematic cross-sectional structure diagram of a dissolved oxygen detection sensor according to one embodiment of the present invention;

fig. 3 is an explosion structure diagram of the protective cover according to one of the technical solutions of the present invention;

fig. 4 is an explosion structure diagram of the liquid storage shell according to one of the technical solutions of the present invention;

fig. 5 is an enlarged structural view of a portion a in fig. 2 according to the present invention.

The reference numerals are specifically: a protection chamber 1; a liquid storage cavity 10; a shield 2; a bottom through hole 20; a mounting groove 21; a bottom screen 22; a lower gasket 23; a lower coil 24; a lower perforation 25; a lower mounting portion 26; an annular groove 3; a side through hole 30; a side screen 31; an elastic ring 32; a display aperture 33; a liquid storage shell 4; an upper mounting groove 40; a lower mounting groove 41; an upper lid body 5; an upper mounting portion 50; a guide cylinder 6; a retainer ring 60; a catch cylinder 61; a seal groove 62; a seal ring 63; a gas permeable membrane 64; an upper coil 65; an upper through hole 66; and an upper gasket 7.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or combinations thereof.

As shown in fig. 1-3, the utility model provides a dissolved oxygen detection sensor, include:

(1) the sensor comprises a sensor body, wherein the bottom end of the sensor body is provided with a gas-permeable membrane 64, the gas-permeable membrane 64 forms a barrier between an external environment and electrolyte of the sensor body, and the gas-permeable membrane 64 can be made of polytetrafluoroethylene or polyperfluorinated ethylene propylene;

specifically, the sensor body includes:

the liquid storage shell 4 is in a cylindrical shape with an open top end, the breathable film 64 is detachably arranged at the bottom end of the liquid storage shell 4, the inner periphery of the top end of the liquid storage shell 4 is recessed to form an upper mounting groove 40, the outer periphery of the bottom end of the liquid storage shell is recessed to form a lower mounting groove 41, namely, the upper mounting groove 40 is positioned at the upper part of the inner periphery of the liquid storage shell 4, the lower mounting groove 41 is positioned at the lower part of the outer periphery of the liquid storage shell 4, the longitudinal sections of the upper mounting groove 40 and the lower mounting groove 41 are L-shaped, the side wall of the upper mounting groove 40 is provided with internal threads, and the side wall of the lower mounting groove 41 is provided with external threads;

the upper cover body 5 is provided with an upper mounting part 50 matched with the upper mounting groove 40, the side wall of the upper mounting part 50 is provided with an external thread matched with the internal thread on the side wall of the upper mounting groove 40, so that the upper mounting part 50 is in sealing threaded connection with the upper mounting groove 40, the upper cover body 5 is matched with the liquid storage shell 4 to form a liquid storage cavity 10 for containing electrolyte, and the part of the bottom end of the upper cover body 5, which is positioned in the liquid storage cavity 10, is provided with a cathode and an anode which are connected with an external testing device through a transmission unit penetrating through the upper cover body 5;

(2) guard shield 2, its sealed removable the locating sensor body bottom forms the cover and establishes the protection chamber 1 of ventilated membrane 64, it is specific:

the protective cover 2 is cylindrical with an open top end, the outer periphery of the top end of the protective cover 2 extends upwards to form a lower mounting part 26 (cylindrical, the outer radius of the outer periphery is equal to that of the protective cover 2, and the inner radius of the inner periphery is larger than that of the top end of the protective cover 2 so as to be matched with the lower mounting groove 41), the inner periphery of the lower mounting part 26 is provided with an internal thread matched with the external thread of the lower mounting groove 41, the lower mounting part 26 is in sealing threaded connection with the lower mounting groove 41, preferably, the outer radius of the liquid storage shell 4 is equal to that of the lower mounting part 26, and further, preferably, the end part of the liquid storage shell 4 in threaded connection with the upper cover body 5 and the end part of the liquid storage shell 4 in threaded connection with the protective cover 2 are both provided with sealing gaskets;

the bottom end of the shield 2 is provided with a bottom through hole 20 in a penetrating manner, the bottom end (lower bottom surface) of the shield 2 is positioned at the bottom through hole 20 and is recessed upwards in the circumferential direction to form a mounting groove 21, the part of the inner wall of the mounting groove 21, which is far away from the bottom through hole 20, is provided with an internal thread, a bottom filter screen 22, a lower gasket 23 and a lower helicoidal ring 24 are sequentially arranged in the mounting groove 21 along the direction far away from the bottom through hole 20, wherein the bottom filter screen 22 is used for filtering sundries in a water body, the lower gasket 23 is a sealing gasket and is arranged between the bottom filter screen 22 and the lower helicoidal ring 24 in a cushioning manner, the periphery of the lower helicoidal ring 24 is provided with an external thread matched with the internal thread on the inner wall of the mounting groove 21, the periphery of the lower helicoidal ring 24 is in threaded connection with the inner wall of the mounting groove 21, the lower gasket 23 and the lower helicoidal ring 24 are provided with lower through holes 25 which are coaxial and have the same diameter as the bottom through hole 20, and in order to facilitate the disassembly of the lower helicoidal ring 24, the lower helicoidal ring 24 is provided with a protruding bottom surface with an operating block on the bottom surface, and the protruding, and preferably two corresponding to the center of the lower helicoidal ring 24; or the lower coil 24 has an annular protrusion protruding from the bottom surface thereof, and the protrusion is polygonal, more preferably, regular polygonal; or the bottom surface of the lower coil 24 is equal to the bottom surface of the shield 2, the bottom surfaces of the lower coil 24 are recessed upwards and are provided with lower clamping grooves, preferably, a pair of clamping grooves with opposite side wall openings is formed, and keys matched with the lower clamping grooves are arranged for locking or unscrewing the lower coil 24.

In the above-mentioned technical solution,the cathode adopts an inert electrode which can be a gold electrode, a silver electrode, a platinum electrode or an alloy electrode and the like, and is preferably a cylindrical silver electrode; the anode adopts an active electrode which is composed of metals with active activities such as iron, zinc, lead, copper, aluminum and the like, preferably iron and lead; in the case of lead, during operation, the cathodic reaction: o is ₂ +4H ⁺ +4e ^- →2H ₂ O, anode reaction: 2Pb +2H ₂ O—2PbO+4H ⁺ +4e ^- The anode is easy to lose electrons and is oxidized to form a current loop with the cathode to complete the whole oxidation-reduction reaction, a current signal is generated, the current is in direct proportion to the concentration of the dissolved oxygen, and the concentration of the dissolved oxygen in the water is judged according to the current. In the using process, assembling the shield 2, then assembling the shield 2 at the bottom end of the sensor body, and carrying out dissolved oxygen determination; adopt this kind of technical scheme, end filter screen 22 realizes dismantling the setting for guard shield 2 through lower helicoid 24 cooperation mounting groove 21, the filter screen 22 washs, changes at the bottom of being convenient for, and is further, guard shield 2 for the sensor body can dismantle the setting, does not influence operation, the processing to ventilated membrane 64.

In another technical solution, the protective cover 2 is inwardly recessed along the circumferential direction to form an annular groove 3, the annular groove 3 penetrates through side through holes 30 communicating with the protective cavity 1 along the circumferential direction at intervals, a side screen 31 and an elastic ring 32 are arranged in the annular groove 3 from inside to outside, the elastic ring 32 positions the side screen 31 and penetrates through display holes 33 corresponding to the side through holes 30 one by one, preferably, the side through holes 30 are round holes, the display holes 33 are long waist holes at two ends, the width of the display holes 33 is equal to the diameter of the side through holes 30, in the above technical solution, preferably, the number of the side through holes 30 is 2-4, when the number of the side through holes 30 is at least two, preferably, the side through holes 30 are arranged along the circumferential direction at equal intervals, the side screen 31 is strip-shaped, the width slightly is less than (< 0.5 mm) the width of annular groove 3, but be greater than the diameter of side through-hole 30, side filter screen 31's length satisfies it and winds around annular groove 3 when establishing the round, and the distance at both ends is not more than the distance between two adjacent side through-holes 30, satisfies the cover to whole side through-holes 30 promptly, when elastic ring 32 is in natural state, its inner peripheral radius is less than side filter screen 31 is around the periphery radius when locating annular groove 3 to when elastic ring 32 cover locates annular groove 3, realize the fixed of offside filter screen 31, adopt this kind of scheme, set up side through-hole 30 at guard shield 2 lateral part, cooperation side filter screen 31's setting improves the exchange speed in protection chamber 1 and external environment, and further, cooperate annular groove 3 to realize covering the side filter screen 31 of establishing to dismantling in step of a plurality of side through-hole 30 through elastic ring 32.

In another technical solution, as shown in fig. 2 and 4-5, the bottom end of the liquid storage shell 4 and the liquid storage cavity 10 are fixedly connected with a guide cylinder 6 in a penetrating manner, the top end of the inner side wall of the guide cylinder 6 is inwardly condensed to form a retaining ring 60, the inner periphery of the retaining ring 60 extends towards the bottom filter screen 22 to form a retaining cylinder 61, the retaining cylinder 61 is matched with the guide cylinder 6 to form a sealing groove 62, a sealing ring 63 is arranged in the sealing groove 62, and a breathable film 64, an upper gasket 7 and an upper screw ring 65 are sequentially arranged along the direction away from the sealing ring 63, wherein:

the part of the inner wall of the guide cylinder 6, which is far away from the blocking cylinder 61, is provided with internal threads, the periphery of the upper spiral ring 65 is provided with external threads matched with the internal threads of the inner wall of the guide cylinder 6, so that the periphery of the upper spiral ring 65 is in threaded connection with the inner wall of the guide cylinder 6, furthermore, the upper gasket 7 and the upper spiral ring 65 are provided with upper through holes 66 which are coaxial with the sealing ring 63 and have the same diameter, and the upper gasket 7 is circumferentially arranged in a sealing manner with the guide cylinder 6;

to facilitate the detachment of the upper coil 65, the upper coil 65 has a block operating protrusion protruding from the bottom surface thereof, and the protrusions are preferably two protrusions correspondingly disposed about the center of the bottom surface of the upper coil 65; or the upper coil 65 protrudes from the bottom surface thereof and has an annular protrusion, which is polygonal, and more preferably, is a regular polygon; or the bottom surface height of the upper screw ring 65 is equal to the bottom surface height of the guide cylinder 6, the upward depressions of the bottom surface of the upper screw ring 65 are both provided with upper clamping grooves, the upper clamping grooves are preferably a pair of grooves with side wall openings oppositely arranged, keys matched with the upper clamping grooves are equipped for locking or unscrewing the upper screw ring 65, and furthermore, the two ends of the keys can be respectively matched with the upper clamping grooves and the lower clamping grooves. By adopting the scheme, the breathable film 64 is detachably arranged by matching the upper spiral ring 65 with the guide cylinder 6, so that the breathable film 64 is convenient to replace, and further, the guide cylinder 6 is arranged to extend downwards relative to the liquid storage shell 4, so that the breathable film 64 and the electrolyte can be conveniently installed without bubbles when the breathable film 64 is replaced by inversion.

In another technical solution, a teflon layer is disposed at an end of the upper gasket 7 opposite to the upper coil 65. With this arrangement, the relative friction between the upper washer 7 and the upper coil 65 is reduced.

The number of apparatuses and the scale of the process described here are intended to simplify the description of the present invention. Applications, modifications and variations of the dissolved oxygen detection sensor of the present invention will be apparent to those skilled in the art.

While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, particular embodiments, but rather to those skilled in the art, having the benefit of the teachings of the present invention, which is capable of numerous modifications and alternative forms, and will be readily apparent to those skilled in the art, and it is not intended to limit the invention to the details shown and described without departing from the general concepts defined by the appended claims and their equivalents.

Claims

1. A dissolved oxygen detection sensor, comprising:

a sensor body having a gas permeable membrane at a bottom end thereof;

the guard shield, its is sealed can dismantle and locate the sensor body bottom forms the cover and establishes the protection chamber of ventilated membrane, the guard shield bottom is run through and is had end through-hole, the guard shield bottom is located end through-hole circumference and caves in and has the mounting groove, set gradually end filter screen, lower packing ring, lower helicoidal along the direction of keeping away from end through-hole in the mounting groove, wherein, lower helicoidal periphery with mounting groove inner wall spiro union, lower packing ring, lower helicoidal have with end through-hole is coaxial, the lower perforation of equant.

2. The dissolved oxygen detection sensor according to claim 1, wherein the sensor body comprises:

3. The dissolved oxygen detection sensor according to claim 2, wherein the shield has annular grooves recessed in the circumferential direction, the annular grooves have side through holes extending therethrough at intervals in the circumferential direction, the side filter mesh and the elastic ring are disposed from inside to outside in the annular grooves, and the elastic ring positions the side filter mesh and has display holes corresponding to the side through holes one to one.

4. The dissolved oxygen detection sensor according to claim 3, wherein the number of the side through-holes is 2 to 4.

5. The dissolved oxygen detecting sensor according to claim 3, wherein the side through-hole is a circular hole, the display hole is a long waist hole having both ends, and the width of the display hole is equal to the diameter of the side through-hole.

6. The dissolved oxygen detecting sensor according to claim 2, wherein a guide cylinder is fixedly connected to the bottom end of the liquid storage casing and the liquid storage cavity in a penetrating manner, a baffle ring is formed by inward condensation of the top end of the inner side wall of the guide cylinder, a baffle cylinder is arranged on the inner periphery of the baffle ring and extends towards the bottom filter screen to form a sealing groove by matching with the guide cylinder, a sealing ring is arranged in the sealing groove, and a gas-permeable membrane, an upper gasket and an upper helicoid are sequentially arranged in a direction away from the sealing ring, wherein the outer periphery of the upper helicoid is in threaded connection with the inner wall of the guide cylinder, and the upper gasket and the upper helicoid are provided with upper through holes which are coaxial with and have the same diameter as the sealing ring.

7. The dissolved oxygen detection sensor of claim 6, wherein a polytetrafluoroethylene layer is disposed on an end of the upper gasket opposite the upper coil.