CN115791931A - Oxygen sensor packaging structure for industrial combustion control and oxygen sensor - Google Patents
Oxygen sensor packaging structure for industrial combustion control and oxygen sensor Download PDFInfo
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- CN115791931A CN115791931A CN202211504574.3A CN202211504574A CN115791931A CN 115791931 A CN115791931 A CN 115791931A CN 202211504574 A CN202211504574 A CN 202211504574A CN 115791931 A CN115791931 A CN 115791931A
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- oxygen sensor
- mounting base
- sensitive core
- combustion control
- platinum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention provides an oxygen sensor packaging structure for industrial combustion control and an oxygen sensor, wherein the packaging structure comprises: mounting a base; the oxygen sensor sensitive core comprises a sensor probe and a signal leading-out end which are sequentially connected; the signal leading-out end is provided with a plurality of metal platinum layers for leading out signals; the ceramic ring is arranged inside the mounting base and is provided with a slot with the size equivalent to that of the cross section of the oxygen sensor sensitive core body, and the oxygen sensor sensitive core body is inserted into the slot; the ceramic ring is wrapped in the mounting base; the pipe shell is connected with the lower part of the mounting base and is a hollow pipe body; and the porous protective cover is connected with the upper part of the mounting base and wraps the outer side of the sensitive core body probe of the sensor and the upper side of the mounting base, and each signal leading-out end of the sensitive core body is positioned on the lower side of the mounting base or the ceramic ring and wraps the inside of the tube shell. The lead is fixedly connected with the metal platinum layer of the signal leading-out end; and the insulating ceramic is provided with a plurality of through holes, and the platinum wires are inserted into the through holes of the insulating ceramic so as to realize fixation and mutual insulation of the platinum wires. The packaging structure is used for executing the protection method of the sensor, and high-temperature toxic smoke protection and high-temperature resistant packaging are achieved.
Description
Technical Field
The invention belongs to the technical field of oxygen sensors, and particularly relates to an oxygen sensor packaging structure for industrial combustion control and an oxygen sensor.
Background
The oxygen sensor is widely applied in the field of industrial combustion control, and plays an important role in fully combusting fuel in a boiler, reducing energy consumption and reducing harmful gas emission.
In the case of incompletely combusted industrial boiler fuel exhaust gas mixtures, in addition to nitrogen (N2), carbon dioxide (CO 2) and water (H2O), large amounts of toxic and harmful combustion products are emitted, in which Hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx), SO2 are legally restricted. According to the prior art, the exhaust gas limits applicable to industrial combustion can only be met by catalytic exhaust gas aftertreatment. The pollutant components mentioned can be reduced by using the waste gas treatment system, and the emission of toxic and harmful gases can be controlled.
Oxygen sensors are typically used in current industrial combustion control systems to control and regulate combustion.
The protection of the current oxygen sensor protection method to the special high-temperature flue gas environment in the industrial combustion flue has the following disadvantages: the large-hole (aperture >) probe protective covers (the aperture is larger than 1 mm) are adopted, and the probe protective covers can only be used for preventing large-size foreign objects from colliding and protecting the sensors and cannot prevent small-particle smoke from poisoning the sensors. In addition, the sensor probe is not isolated from the tail leading-out end, and the tail leading-out end is exposed in high-temperature smoke and is also subjected to high-temperature corrosion for a long time, so that the service life of the sensor is shortened.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a packaging structure of an oxygen sensor for industrial combustion control and the oxygen sensor.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the invention provides a packaging structure of an oxygen sensor for industrial combustion control, comprising:
mounting a base;
the oxygen sensor sensitive core comprises a sensor probe and a signal leading-out end which are sequentially connected; the signal leading-out end is provided with a plurality of metal platinum layers for leading out signals;
the ceramic ring is arranged inside the mounting base and is provided with a slot with the size equivalent to that of the cross section of the oxygen sensor sensitive core body, and the oxygen sensor sensitive core body is inserted into the slot; the ceramic ring is wrapped in the mounting base;
the pipe shell is connected with the lower part of the mounting base and is a hollow pipe body; each signal leading-out end of the sensitive core body of the oxygen sensor is positioned at the lower side of the mounting base or the ceramic ring and wrapped inside the tube shell;
the porous protective cover is connected with the upper part of the mounting base and wraps the upper sides of the sensor probe and the mounting base;
the lead is fixedly connected with the metal platinum layer of the signal leading-out end;
and the insulating ceramic is provided with a plurality of through holes, and the platinum wires are inserted into the through holes of the insulating ceramic so as to realize fixation and mutual insulation of the platinum wires.
Furthermore, the mounting base is provided with a hexagonal structure for mounting and a threaded structure, and during mounting, the hexagonal structure is screwed, so that the threads can be mechanically fixed at the mounting position with the threaded hole; the mounting base is made of stainless steel.
Further, the thermal expansion coefficient of the ceramic ring is matched with that of the oxygen sensor sensitive core and that of the stainless steel.
Furthermore, the pipe shell is of a cylindrical structure, the upper part of the pipe shell is uncovered, and the lower part of the pipe shell is uncovered; the tube shell is made of stainless steel.
Furthermore, the porous protective cover is made of stainless steel;
the porous protective cover has a uniformly distributed microporous structure, and the aperture of each micropore is 5-15 mu m, so that the porous protective cover is used for filtering particles and water vapor in smoke.
Furthermore, the wires are platinum wires, and the number of the platinum wires is consistent with that of the signal leading-out ends of the sensitive core;
the platinum wire is provided with a sheet-shaped wire head and a wire tail of a wire structure;
the head sheet structure of the lead is welded and fixed with the metal platinum layer of the leading-out end of the sensitive core body through metal slurry; the tail wire-shaped structure of the wire can be fixedly connected with other metal wires through extrusion wrapping.
Further, the packaging structure further comprises a plug arranged below the insulating ceramic;
the plug is provided with a plurality of through holes, and the number of the through holes is consistent with that of the platinum wires; the plug is used for fixing the insulating ceramic and the conducting wire and sealing the whole packaging structure; the platinum wire is inserted into the through hole of the plug.
Further, the plug is a fluorine rubber plug.
In a second aspect, the present invention provides an oxygen sensor for industrial combustion control, comprising the packaging structure according to the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
1. the probe is protected by the porous protective cover, so that the probe is breathable, and can prevent the probe of the sensor from being poisoned by tiny smoke dust or water vapor; the porous protective cover limits and buffers the waste gas flow, so that the zirconium oxide ceramic of the probe is prevented from cracking and the sensor fails due to the action of large-flow gas on a high-temperature working area of the sensor probe;
2. the high-temperature-resistant insulating ceramic ring with low heat conduction capacity and thermal expansion coefficient matched with the stainless steel material in thermal expansion is adopted to carry out thermal isolation protection on the sensor probe and the leading-out end of the tail part and package and fix the sensitive core body, so that the tail part leading-out end is prevented from being subjected to high-temperature poisoning corrosion for a long time, the packaging structure is high-temperature-resistant, toxic substances are prevented from poisoning the sensor electrode, the high-temperature-resistant packaging structure is suitable for a typical industrial combustion flue gas environment, and the service life of the sensor can be prolonged.
Drawings
FIG. 1 is an exploded view of an encapsulation structure
FIG. 2 is a schematic view of the assembly of the sensitive core with the ceramic ring and platinum wire;
FIG. 3 is a schematic view of the mounting base and mounting cartridge;
FIG. 4 is a schematic view of the assembled insulating ceramic;
FIG. 5 is a schematic view of the assembled fluorine rubber stopper;
FIG. 6 is a schematic view of the assembled porous shield.
In the figure: 1. a sensitive core; 11. a sensor probe; 12. a signal leading-out terminal; 2. mounting a base; 3. a ceramic ring; 4. a pipe shell; 5. a porous protective cover; 6. a wire; 7. an insulating ceramic; 8. and (4) a plug.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of describing the present embodiment and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present embodiment.
The first embodiment is as follows:
the embodiment provides a packaging structure, which is used for executing a protection method of the sensor, and realizing high-temperature toxic smoke protection and high-temperature resistant packaging.
As shown in fig. 1, the package structure includes:
the oxygen sensor sensitive core body 1 comprises a head part induction function area (a sensor probe 11) and a tail part signal leading-out terminal 12 (a signal leading-out terminal 12) which are connected in sequence as shown in figure 2; the signal leading-out terminal 12 is provided with a plurality of platinum layers for signal leading-out.
The mounting base 2 is provided with a mounting hexagonal structure and a thread structure as shown in fig. 3, and when mounting, the hexagonal structure is screwed, so that the thread can be mechanically fixed at the mounting position with the threaded hole; the base is made of stainless steel, and is high-temperature resistant and corrosion resistant.
The ceramic ring 3 is arranged inside the mounting base 2 and is provided with a slot. The slot is provided with a rectangular hole with the same size as the cross section of the sensitive core body 1 of the oxygen sensor, and the rectangular hole is wrapped in the mounting base 2; the oxygen sensor sensitive core body 1 is inserted into the slot; the thermal expansion coefficient of the ceramic ring 3 is matched with that of the oxygen sensor sensitive core body 1 and the stainless steel, and the oxygen sensor sensitive core body is low in thermal conductivity, good in insulating property, high-temperature resistant and compact in structure.
A pipe shell 4 connected with the lower part of the mounting base 2; the tube shell 4 is of a cylindrical structure, and the upper part of the tube shell is uncovered, while the lower part of the tube shell is uncovered; the tube shell 4 is made of stainless steel, is high-temperature resistant, has certain mechanical strength, and can protect other internal structural components and the oxygen sensor sensitive core body 1.
And a porous protective cover 5, as shown in fig. 6, connected to the upper part of the mounting base 2, wrapping the oxygen sensor core and the ceramic base, and exposing the second end of each metal pin outside the porous cover. The porous protective cover 5 is made of stainless steel and can resist high temperature; the porous protective cover 5 has a uniformly distributed micropore structure, the pore diameter of each micropore is 5-15 mu m, and particles and water vapor in smoke can be filtered.
A platinum wire 6 provided with a sheet-like structure wire 6 head and a wire 6 tail; the platinum wire 6 has good conductivity and high temperature resistance; the number of the platinum wires 6 is consistent with that of the signal leading-out ends 12 of the sensitive core body 1; the head sheet structure of the lead 6 is welded and fixed with the metal platinum layer at the leading-out end of the sensitive core body 1 through metal slurry; the tail wire-shaped structure of the wire 6 can be fixedly connected with other metal wires 6 through extrusion wrapping, so that the wire 6 is prolonged, and the cost is reduced.
The insulating ceramic 7 is provided with a plurality of through holes as shown in fig. 4, and the number of the through holes is consistent with that of the signal leading-out terminals 12 of the sensitive core body 1; the platinum lead 6 is inserted into the through hole of the insulating ceramic 7, so that the platinum lead 6 and the platinum lead 6 are mutually insulated; the insulating ceramic 7 realizes the fixation of the platinum wire 6 through a through hole.
The fluorine rubber plug 8 is provided with a plurality of through holes as shown in fig. 5, and the number of the through holes is consistent with that of the platinum wires 6; the fluorine rubber plug 8 is positioned below the insulating ceramic 7 and used for fixing the insulating ceramic 7 and the lead 6 and sealing the whole packaging structure; the platinum wire 6 is inserted into the through hole of the fluorine rubber plug 8, so that the platinum wire 6 and the platinum wire 6 are insulated from each other; the fluorine rubber plug 8 realizes the fixation of the platinum wire 6 through a through hole.
The invention adopts the porous protective cover 5 with a micropore structure to protect the probe, which is not only air permeable, but also can prevent the poisoning of tiny particle smoke dust or water vapor to the probe of the sensor; the porous protective cover 5 limits and buffers the flow of the waste gas, so that the zirconia ceramics of the probe is prevented from cracking and the sensor fails due to the action of large-flow gas on a high-temperature working area of the sensor probe 11.
The packaging structure provided by the invention is high-temperature resistant, prevents toxic substances from poisoning the sensor electrode, is suitable for typical industrial combustion flue gas environment, and can prolong the service life of the sensor.
The installation steps of the product are shown in fig. 2-6, and comprise the following steps:
step 1: the sensitive core body 1 is assembled with a ceramic ring 3 and a platinum wire 6.
Step 2: the mounting base 2 and the housing 4 are assembled.
And step 3: an insulating ceramic 7 is assembled.
And 4, step 4: a fluorine rubber plug 8 is fitted.
And 5: a porous shield 5 is fitted.
Example two:
the embodiment provides an oxygen sensor for industrial combustion control, which comprises the packaging structure according to the first embodiment.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the invention, "plurality" means two or more unless explicitly specifically defined otherwise.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
In the description herein, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (9)
1. An encapsulation structure of an oxygen sensor for industrial combustion control, comprising:
mounting a base;
the oxygen sensor sensitive core comprises a sensor probe and a signal leading-out end which are sequentially connected; the signal leading-out end is provided with a plurality of metal platinum layers for leading out signals;
the ceramic ring is arranged inside the mounting base and is provided with a slot with the size equivalent to that of the cross section of the oxygen sensor sensitive core body, and the oxygen sensor sensitive core body is inserted into the slot; the ceramic ring is wrapped in the mounting base;
the pipe shell is connected with the lower part of the mounting base and is a hollow pipe body; the signal leading-out end of the sensitive core body of the oxygen sensor is positioned at the lower side of the mounting base or the ceramic ring and is wrapped inside the tube shell;
the porous protective cover is connected with the upper part of the mounting base and wraps the outer side of the sensitive core probe of the sensor and the upper side of the mounting base;
the lead is fixedly connected with the metal platinum layer of the signal leading-out end;
and the insulating ceramic is provided with a plurality of through holes, and the platinum wires are inserted into the through holes of the insulating ceramic so as to realize fixation and mutual insulation of the platinum wires.
2. The packaging structure of the oxygen sensor for industrial combustion control as claimed in claim 1, wherein the mounting base is provided with a hexagonal mounting structure and a threaded structure, and when the mounting base is mounted, the hexagonal mounting structure is screwed to mechanically fix the threads at the mounting position with the threaded hole; the mounting base is made of stainless steel.
3. The packaging structure of an oxygen sensor for industrial combustion control as claimed in claim 1, wherein the ceramic ring thermal expansion coefficient is matched to the thermal expansion coefficient of the oxygen sensor sensitive core and stainless steel.
4. The package structure of an oxygen sensor for industrial combustion control as claimed in claim 1, wherein said tube case has a cylindrical structure, an upper portion without a cap, and a lower portion without a cap; the tube shell is made of stainless steel.
5. The packaging structure of an oxygen sensor for industrial combustion control as claimed in claim 1, wherein the porous shield is made of stainless steel;
the porous protective cover has a uniformly distributed microporous structure, the pore diameter of each micropore is 5-15 mu m, and the porous protective cover is used for filtering particles and water vapor in smoke.
6. The packaging structure of the oxygen sensor for industrial combustion control as claimed in claim 1, wherein the wires are platinum wires, and the number of the platinum wires is consistent with the number of the signal leading-out ends of the sensitive core;
the platinum wire is provided with a sheet-shaped wire head and a wire tail of a wire-shaped structure;
the head sheet structure of the lead is welded and fixed with the metal platinum layer of the leading-out end of the sensitive core through metal slurry; the tail wire-shaped structure of the wire can be fixedly connected with other metal wires through extrusion wrapping.
7. The package structure of an oxygen sensor for industrial combustion control according to claim 1, further comprising a plug disposed under the insulating ceramic
The plug is provided with a plurality of through holes, and the number of the through holes is consistent with that of the platinum wires; the plug is used for fixing the insulating ceramic and the conducting wire and sealing the whole packaging structure; the platinum wire is inserted into the through hole of the plug.
8. The packaging structure of an oxygen sensor for industrial combustion control according to claim 7, characterized in that the plug is a fluorine rubber plug.
9. An oxygen sensor for industrial combustion control, comprising the package structure according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504574.3A CN115791931A (en) | 2022-11-29 | 2022-11-29 | Oxygen sensor packaging structure for industrial combustion control and oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211504574.3A CN115791931A (en) | 2022-11-29 | 2022-11-29 | Oxygen sensor packaging structure for industrial combustion control and oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115791931A true CN115791931A (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211504574.3A Pending CN115791931A (en) | 2022-11-29 | 2022-11-29 | Oxygen sensor packaging structure for industrial combustion control and oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115791931A (en) |
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- 2022-11-29 CN CN202211504574.3A patent/CN115791931A/en active Pending
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