CN112229948B - Oxygen sensor and manufacturing process thereof and household appliance - Google Patents

Oxygen sensor and manufacturing process thereof and household appliance Download PDF

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Publication number
CN112229948B
CN112229948B CN202010966347.7A CN202010966347A CN112229948B CN 112229948 B CN112229948 B CN 112229948B CN 202010966347 A CN202010966347 A CN 202010966347A CN 112229948 B CN112229948 B CN 112229948B
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Prior art keywords
oxygen sensor
detection unit
positioning hole
sensor according
signal wire
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CN112229948A (en
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陈权明
许胜涛
麦伟添
潘叶江
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Vatti Co Ltd
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Vatti Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/06—Roasters; Grills; Sandwich grills
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
    • G01N33/0067—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display by measuring the rate of variation of the concentration
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
    • A47J2027/043—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels for cooking food in steam

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

The invention belongs to the technical field of household appliances, and particularly relates to an oxygen sensor, a manufacturing process thereof and a household appliance. The oxygen sensor is used for household appliances and comprises a detection unit for detecting the oxygen concentration, a shell component, a signal wire component and an insulating connecting piece; the shell assembly is sleeved outside the detection unit to form a gap, and the shell assembly is connected with the household appliance; the detection unit is electrically connected with the signal wire assembly; the insulating connecting piece is arranged in the gap and used for connecting the detection unit and the shell component. The manufacturing process comprises the following steps: electrically connecting the detection unit with the signal wire assembly to obtain a semi-finished product; an insulating connector is mounted within the gap for connecting the detection unit and the housing assembly. The oxygen sensor solves the problem that the cost of the household appliance is higher because the conventional oxygen sensor for the automobile is used for the household appliance.

Description

Oxygen sensor, manufacturing process thereof and household appliance
Technical Field
The invention belongs to the technical field of household appliances, and particularly relates to an oxygen sensor, a manufacturing process thereof and a household appliance.
Background
In the cooking process, the humidity of cooking is usually controlled according to different food materials, so as to control the taste of the food materials. The maximum temperature of the cooking device may reach 250 ℃, and conventional humidity sensors are easily damaged at high temperatures.
In order to solve the above problem, an oxygen sensor is currently on the market to detect a change in oxygen concentration and indirectly reflect a change in steam concentration. But since the current oxygen sensor is mainly applied to automobiles for detecting the oxygen concentration of the combustion exhaust gas of the engine to adjust the air-fuel ratio. Because of the high temperature of the vehicle vibration and other reasons, the process of the oxygen sensor fixing and sealing structure is higher, and if the vehicle oxygen sensor is directly applied to household appliances, the application cost is undoubtedly increased.
Disclosure of Invention
The invention provides an oxygen sensor, aiming at solving the problem that the cost of household appliances is high because the conventional oxygen sensor for an automobile is used for the household appliances.
The invention also provides a manufacturing process of the oxygen sensor.
The invention also provides a household appliance using the oxygen sensor.
The oxygen sensor is used for household appliances and comprises a detection unit for detecting the oxygen concentration, a shell component, a signal wire component and an insulating connecting piece;
the shell component is sleeved outside the detection unit to form a gap, and the shell component is connected with the household appliance; the detection unit is electrically connected with the signal wire assembly; the insulating connecting piece is arranged in the gap and used for connecting the detection unit and the shell component.
The oxygen sensor is further improved in that the housing assembly is sleeved outside the detection unit to form an annular gap.
The oxygen sensor of the invention is further improved in that the housing assembly comprises a protective shell, and a connecting part mounted on the protective shell;
the protective shell is sleeved outside the detection unit to form the annular gap; the connecting part is connected with the household appliance.
The oxygen sensor of the invention is further improved in that the protective shell is provided with vent holes in the circumferential direction.
The oxygen sensor is further improved in that the connecting part is a flange, and the flange is riveted with the protective shell.
A further improvement of the oxygen sensor of the present invention is that the detection unit includes a chip for detecting the oxygen concentration.
A further improvement to the oxygen sensor of the present invention is that the signal line assembly includes a signal line; the signal line is electrically connected with the detection unit.
In a further improvement of the oxygen sensor of the present invention, the signal line assembly further comprises a fixing member; the fixing piece is axially provided with a signal wire positioning hole, and one end of the signal wire penetrates through the signal wire positioning hole to be electrically connected with the detection unit.
The oxygen sensor is further improved in that a limiting bulge is arranged on the fixing piece in the circumferential direction, and a limiting groove is formed in a workpiece assembled with the fixing piece; or the fixing piece is circumferentially provided with a limiting groove, and a workpiece assembled with the fixing piece is provided with a limiting bulge.
The oxygen sensor of the present invention is further improved in that the insulating connector is further connected to the signal line assembly electrically connected to the detection unit.
The oxygen sensor is further improved in that the detection unit is electrically connected with the signal line assembly through conductive adhesive.
The invention relates to a manufacturing process of an oxygen sensor, which comprises the following steps:
electrically connecting the detection unit with the signal wire assembly to obtain a semi-finished product;
an insulating connector is mounted within the gap for connecting the detection unit and the housing assembly.
The manufacturing process of the oxygen sensor is further improved in that the detection unit is electrically connected with the signal wire assembly to obtain a semi-finished product, and the manufacturing process specifically comprises the following steps:
and electrically connecting the chip of the detection unit with the signal wire of the signal wire assembly through a wire bonding tool through conductive adhesive, and obtaining a semi-finished product after the conductive adhesive is cooled and solidified.
The manufacturing process of the oxygen sensor is further improved in that the insulating connecting piece is arranged in the gap and used for connecting the detection unit and the shell component, and the manufacturing process specifically comprises the following steps:
sleeving a protective shell of the shell assembly on a pouring tool, inserting the detection unit of the semi-finished product into the pouring tool arranged in the protective shell, forming a pouring space between the protective shell and the pouring tool, and positioning part of the chip in the pouring space;
and filling the insulating connecting piece in the fluid state into the filling space, and obtaining the oxygen sensor after the insulating connecting piece in the fluid state is cooled and solidified.
The manufacturing process of the oxygen sensor is further improved in that the wire bonding tool comprises a tool body; the tool body is provided with a first positioning hole for positioning the detection unit, a second positioning hole for positioning the fixing piece and a dispensing window;
the dispensing window is communicated with the first positioning hole and the second positioning hole and is used for electrically connecting the chip of the detection unit with the signal wire through conductive adhesive.
The manufacturing process of the oxygen sensor is further improved in that the tool body is also provided with a limiting groove; the limiting groove is communicated with the second positioning hole and is in limiting connection with the limiting protrusion.
The manufacturing process of the oxygen sensor is further improved in that the first positioning hole and the second positioning hole are respectively arranged on two opposite sides of the dispensing window, and the first positioning hole and the second positioning hole are coaxially arranged.
The manufacturing process of the oxygen sensor is further improved in that the area of the cross section of the second positioning hole in the axial direction is larger than that of the cross section of the first positioning hole in the axial direction.
The manufacturing process of the oxygen sensor is further improved in that the perfusion tool comprises a support column, and a third positioning hole is axially formed in the support column; the third positioning hole is a blind hole, and the depth of the third positioning hole is smaller than the length of the chip; the height of the supporting column is smaller than that of the protective shell.
The manufacturing process of the oxygen sensor is further improved in that no gap is formed between the peripheral surface of the protective shell and the peripheral surface of the support column, and a filling space is formed between the upper end surface of the protective shell and the upper end surface of the support column.
The manufacturing process of the oxygen sensor is further improved in that the perfusion tool further comprises a base; a groove is formed in the base, and a limiting table is limited at the edge of the groove towards the bottom of the groove; the support column is vertically installed in the groove.
The invention relates to a household appliance, which comprises an appliance body and the oxygen sensor; the oxygen sensor is installed on the electric appliance body.
Compared with the prior art, the invention adopting the scheme has the beneficial effects that:
because the oxygen sensor of the embodiment only comprises the detection unit, the shell component, the signal wire component and the insulating connecting piece, the structure of the oxygen sensor is simpler compared with that of an oxygen sensor for a vehicle, and the cost is lower. The shell component is sleeved outside the detection unit, not only can the detection unit be protected, but also the shell component can be connected with a household appliance; meanwhile, the detection unit is electrically connected with the signal wire assembly; the insulating connecting piece is arranged in the gap and used for connecting the detection unit with the shell component, so that the oxygen sensor of the embodiment is installed on the household appliance through the shell component, and the problem that the cost of the household appliance is high due to the fact that the existing oxygen sensor for the automobile is used on the household appliance is effectively solved.
The invention has simple manufacturing process and further reduces the manufacturing cost.
The household appliance can at least effectively solve the problem that the cost of the household appliance is higher when the conventional oxygen sensor for the automobile is used for the household appliance.
Drawings
FIG. 1 is a schematic view of an assembly structure of an oxygen sensor according to the present invention;
FIG. 2 isbase:Sub>A schematic cross-sectional view of section A-A of FIG. 1;
FIG. 3 is a schematic view of an assembly structure of a detection unit and a signal line assembly of an oxygen sensor according to the present invention;
FIG. 4 is an enlarged schematic view of the structure at B in FIG. 3;
FIG. 5 is a schematic structural diagram of a fixing member of an oxygen sensor according to the present invention;
FIG. 6 is a flow chart of a process for fabricating an oxygen sensor according to the present invention;
FIG. 7 is a schematic structural diagram of a wire bonding tool applied in the manufacturing process of an oxygen sensor according to the present invention;
FIG. 8 is a schematic cross-sectional view of section C-C of FIG. 7;
FIG. 9 is a schematic structural diagram of a detection unit and a signal line assembly assembled to a wire bonding tool in the manufacturing process of the oxygen sensor according to the present invention;
FIG. 10 is an enlarged schematic view of the structure shown in FIG. 9 at another perspective D;
FIG. 11 is a schematic structural diagram of a perfusion fixture used in a manufacturing process of an oxygen sensor according to the present invention;
fig. 12 is an assembly structure diagram of inserting the detection unit of the semi-finished product into the third positioning hole;
FIG. 13 is a schematic view of an assembly structure in which a protective shell is fitted over a support column;
FIG. 14 is a schematic view of the assembly of the housing assembly to the potting fixture;
FIG. 15 is a cross-sectional view of section E-E of FIG. 14;
fig. 16 is a schematic sectional view showing the insulating connector poured into the pouring space.
In the figure, 1, a detection unit; 2. a housing assembly; 3. a signal line assembly; 4. an insulating connector; 5. wire bonding tooling; 6. filling a tool; 21. a protective shell; 22. a connecting portion; 31. a signal line; 32. a fixing member; 321. signal line positioning holes; 322. a limiting bulge; 51. a tool body; 511. a first positioning hole; 512. a second positioning hole; 513. dispensing windows; 514. a limiting groove; 61. a support column; 62. a base; 621. a groove; 622. and a limiting table.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application 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 invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "axial," "radial," and the like are used in the positional or orientational relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The meaning of "plurality" is two or more unless explicitly defined otherwise.
In the present invention, unless otherwise explicitly 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; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Example 1
The present embodiment provides an oxygen sensor for a home appliance, as shown in fig. 1 and 2, including a detection unit 1 for detecting an oxygen concentration, a housing assembly 2, a signal wire assembly 3, and an insulating connector 4;
the shell component 2 is sleeved outside the detection unit 1 to form a gap, and the shell component 2 is connected with the household appliance; the detection unit 1 is electrically connected with the signal line assembly 3; an insulating connector 4 is provided in the gap for connecting the detection unit 1 and the housing assembly 2.
Since the oxygen sensor of the present embodiment includes only the detection unit 1, the housing assembly 2, the signal wire assembly 3, and the insulating connector 4, the structure thereof is simple compared to that of a vehicle oxygen sensor, and therefore, the cost is low. The shell component 2 is sleeved outside the detection unit 1, the shell component 2 not only plays a role in protecting the detection unit 1, but also the shell component 2 can be connected with a household appliance; meanwhile, the detection unit 1 is electrically connected with the signal line assembly 3; the insulating connecting piece 4 is arranged in the gap and used for connecting the detection unit 1 and the shell component 2, so that the oxygen sensor of the embodiment is installed on the household appliance through the shell component 2, and the problem that the cost of the household appliance is high due to the fact that the existing oxygen sensor for the automobile is used on the household appliance is effectively solved.
In addition, the insulating connecting body 4 of the present embodiment is to connect the housing assembly 2 and the detecting unit 1 to form a whole body of the housing assembly 2 and the detecting unit 1, and is to avoid electrification of the housing assembly 2.
Preferably, the insulating connecting body 4 is made of plastic, rubber, or the like, in consideration of the necessity of having good insulation. In addition, considering the difference of the application environment of the oxygen sensor of the present embodiment, for example, when the oxygen sensor of the present embodiment is applied to a steam oven, the temperature of the steam oven is high, so the insulating connecting body 4 is required to have a good high temperature resistance.
In the present embodiment, the detecting unit 1 is electrically connected to the signal line assembly 3 through a conductive adhesive; on one hand, the conductive adhesive has a conductive function; on the other hand, for the purpose of processing, for example, the detection unit 1 can be directly connected with the signal wire assembly 3 by using a dispensing device; the detection unit 1 and the signal line assembly 3 can be electrically connected by the conductive adhesive by bare hands. In addition, considering the application scenario of the oxygen sensor of the present embodiment, for example, when the oxygen sensor of the present embodiment is applied to a steam oven, the conductive adhesive needs to have a good high temperature resistance while having a good conductivity.
Preferably, the insulating connector 4 is further connected to the signal line assembly 3 electrically connected to the detecting unit 1, in order to enhance the fixation of the signal line assembly 3 to the detecting unit 1 while connecting the housing assembly 2 to the detecting unit 1.
In this embodiment, the housing assembly 2 is sleeved outside the detection unit 1 to form an annular gap. Since the housing assembly 2 is usually made of stainless steel and has a certain conductivity, if the housing assembly 2 and the detecting unit 1 are in direct contact, the housing assembly 2 may be electrified, so to avoid this problem, in this embodiment, the housing assembly 2 is sleeved outside the detecting unit 1 to form an annular gap, which at least has air between the housing assembly 2 and the detecting unit 1, and the air is an insulator under a voltage of 220V.
Preferably, the detecting unit 1 includes a chip for detecting the oxygen concentration, and the chip may be a ceramic chip; the chip output terminal is electrically connected to the signal line assembly 3.
Further, a housing assembly 2 for protecting the detection unit 1 and also for interfacing with household appliances;
the housing assembly 2 includes a protective case 21, and a connection portion 22 mounted on the protective case 21;
the protective shell 21 is sleeved outside the detection unit 1 to form an annular gap; the connection part 22 is connected to the home appliance.
A vent hole 211 is provided in the circumferential direction of the protective case 21, and the purpose of the vent hole 211 is to allow air to pass through to contact a detection region of the detection unit 1 located inside the protective case 21.
Since the detection area of the detection unit 1 is usually located at the other end away from the signal line assembly 3, the vent hole 211 is also located at the other end of the protective casing 21 away from the signal line assembly 3, in order to allow the air to contact the detection area of the detection unit 1 as quickly as possible, thereby quickly detecting the oxygen concentration.
Connecting portion 22 is the ring flange, and the ring flange is riveted with protective housing 21, is connected shell subassembly 2 and domestic appliance through the ring flange, compares in the oxygen sensor thread tightening mode for the car, has simplified the processing technology of oxygen sensor, and then has reduced the processing cost.
Further, the signal line assembly 3 includes a signal line 31; the signal line 31 is electrically connected to the detecting unit 1, as shown in fig. 3 and 4. The signal wire 31 is externally wrapped with an insulating layer, preferably a nickel-plated copper core fluoroplastic high-temperature wire. One end metal core of the signal line 31 is exposed, and the exposed metal core is electrically connected with the chip of the detection unit 1 through the conductive adhesive and used for outputting the detection result of the chip.
As shown in fig. 5, the signal line assembly 3 further includes a fixing member 32; the fixing member 32 is axially provided with a signal line positioning hole 321, and one end of the signal line 31 passes through the signal line positioning hole 321 to be electrically connected to the detecting unit 1. The signal line 31 is limited in the signal line positioning hole 321 for the sake of appearance and processing.
The fixing member 32 is circumferentially provided with a limiting protrusion 322, and a workpiece assembled with the fixing member 32 is provided with a limiting groove 514; or the fixing member 32 is provided with a limit groove 514 in the circumferential direction and a limit protrusion 322 is provided on the workpiece assembled with the fixing member 32.
The workpiece assembled with the fixing member 32 may be a household appliance, or may be other tools, such as a wire bonding tool 5.
Example 2
The embodiment provides a manufacturing process of an oxygen sensor, as shown in fig. 6, the process includes the following steps:
s1, electrically connecting the detection unit 1 with the signal line assembly 3 to obtain a semi-finished product.
And S2, installing an insulating connecting piece 4 in the gap for connecting the detection unit 1 and the shell component 2.
The above steps of this embodiment can be directly operated by bare hands, for example, the chip of the detection unit 1 and the signal line 31 of the signal line assembly 3 are electrically connected by the conductive adhesive by bare hands, so as to obtain a semi-finished product. For example, glue is applied to the insulating connector 4, and then the insulating connector 4 is mounted in the gap, and the insulating connector 4 is connected to the housing assembly 2 rather than the detection unit 1.
Furthermore, a semi-finished product can be manufactured by a contact tool, in this embodiment, the chip of the detection unit 1 and the signal line 31 of the signal line assembly 3 are electrically connected through the conductive adhesive by the line bonding tool 5, and after the conductive adhesive is cooled and solidified, the semi-finished product is obtained.
Sleeving a protective shell 21 of the shell assembly 2 on a pouring tool 6, inserting the semi-finished detection unit 1 into the pouring tool 6 arranged in the protective shell 21, forming a pouring space between the protective shell 21 and the pouring tool 6, and positioning part of chips in the pouring space;
and (3) pouring the insulation connecting piece 4 in the fluid state into the pouring space, and obtaining the oxygen sensor after the insulation connecting piece 4 in the fluid state is cooled and solidified.
Further, as shown in fig. 7 and 8, the wire bonding tool 5 includes a tool body 51; the tool body 51 is provided with a first positioning hole 511 for positioning the detection unit 1, a second positioning hole 512 for positioning the fixing member 32, and a dispensing window 513;
the dispensing windows 513 are communicated with the first positioning holes 511 and the second positioning holes 512 for electrically connecting the chips of the detecting unit 1 with the signal lines 31 through conductive adhesives.
As shown in fig. 9 and 10, in use, the chip of the detection unit 1 is inserted into the first positioning hole 511 so that the output terminal of the chip is positioned in the dispensing window 513; meanwhile, the fixing member 32 is inserted into the second positioning hole 512 so that the signal wire 31 with the exposed wire is also positioned in the dispensing window 513; then, the signal line 31 is aligned with the output terminal of the chip, the liquid conductive adhesive is dotted at the connection between the signal line 31 and the output terminal of the chip to electrically connect the signal line 31 of the signal line assembly 3 and the chip of the detection unit 1, and after the conductive adhesive is cooled, the conductive adhesive is taken out to obtain a semi-finished product, as shown in fig. 3.
Preferably, the tool body 51 is further provided with a limiting groove 514; the limiting groove 514 is communicated with the second positioning hole 512, and the limiting groove 514 is connected with the limiting protrusion 322 in a limiting way.
When the fixing element 32 is inserted into the second positioning hole 512, the circumferential limiting protrusion 322 of the fixing element 32 is limited in the limiting groove 514, so that the fixing element 32 is limited, and the fixing element 32 is prevented from entering the dispensing window 513 entirely.
Preferably, the first positioning hole 511 and the second positioning hole 512 are respectively disposed on two opposite sides of the dispensing window 513, and the first positioning hole 511 and the second positioning hole 512 are coaxially disposed, as shown in fig. 8.
The area of the axial cross section of the second positioning hole 512 is larger than the area of the axial cross section of the first positioning hole 511.
After the conductive adhesive is cooled, the fixing member 32 of the signal line assembly 3 is pulled out from the second positioning hole 512, and then the chip of the detection unit 1 is driven to sequentially pass through the first positioning hole 511 and the dispensing window 513, and finally pulled out from the second positioning hole 512.
Further, as shown in fig. 11, the pouring tool 6 includes a supporting column 61, and a third positioning hole 611 is axially formed in the supporting column 61; the third positioning hole 611 is a blind hole, and the depth of the third positioning hole 611 is smaller than the length of the chip; the height of the support column 61 is smaller than that of the protective case 21.
When in use, the chip of detection unit 1 is inserted into third positioning hole 611, as shown in fig. 12, because the depth of third positioning hole 611 is smaller than the length of the chip, the upper portion of the chip is outside third positioning hole 611; then, the protective shell 21 is sleeved outside the supporting column 61, as shown in fig. 13, since the height of the supporting column 61 is smaller than the height of the protective shell 21, a filling space is formed between the supporting column 61 and the protective shell 21.
Preferably, there is no gap between the peripheral surface of the protective case 21 and the peripheral surface of the support column 61, and a filling space is formed between the upper end surface of the protective case 21 and the upper end surface of the support column 61, as shown in fig. 15. The insulation connecting piece 4 in a fluid state is poured into the pouring space, after cooling, the protection shell 21 and the detection unit 1 are connected through the solid insulation connecting piece 4, and meanwhile, the fixation of the detection unit 1 and the signal wire 32 is strengthened.
The pouring tool 6 further comprises a base 62; a groove 621 is arranged on the base 62, and a limit table 622 is limited at the edge of the groove 621 facing the bottom of the groove 621; the support post 61 is vertically mounted in the recess 621.
When the protective shell is sleeved outside the supporting column 61, the connecting portion 22 (such as a flange) is just limited on the limiting table 622 as shown in fig. 14 and 15, finally, the insulating connecting member 14 in a fluid state is filled into the filling space, and after cooling, the product oxygen sensor is obtained as shown in fig. 16.
The manufacturing process of the sensor of embodiment 1 is specifically described by combining the wire bonding tool 5 and the pouring tool 6:
the chip of the detecting unit 1 is inserted into the first positioning hole 511, and the output end of the chip is positioned in the dispensing window 513, as shown in fig. 9.
The fixing member 32 is inserted into the second positioning hole 512, and the limiting protrusion 322 is limited in the limiting groove 514, so that the exposed metal core of the signal wire 31 is also located in the dispensing window 513, as shown in fig. 9.
The exposed metal core of the signal line 31 in the dispensing window 513 is aligned with the output end of the chip, and then the conductive adhesive in a fluid state is dispensed in the dispensing window 513 at the connection position of the exposed metal core of the signal line 31 and the output end of the chip, so that the signal line 31 and the chip are electrically connected through the conductive adhesive, as shown in fig. 9 and 10.
After the conductive adhesive is cooled and solidified, a semi-finished product is obtained, as shown in fig. 3; because the area of the axial cross section of the second positioning hole 512 is larger than that of the axial cross section of the first positioning hole 511, the fixing member 32 can be pulled out of the second positioning hole 512, and the semi-finished product is separated from the wire bonding tool 5.
The chip of the detection unit 1 in the semi-finished product is inserted into the third positioning hole 611 of the pouring tool 6 again, as shown in fig. 12, because the depth of the third positioning hole 611 is smaller than the length of the chip, the upper portion of the chip is located outside the third positioning hole 611.
Sleeving the protective shell 21 on the outside of the supporting column 61, and abutting the bottom of the protective shell 21 against the bottom of the groove 621, at the same time, the connecting part 22 (such as a flange) is limited on the limiting table 622 to close the groove 621, as shown in fig. 13-15; in the present embodiment, since the height of the support columns 61 is smaller than the height of the protective case 21, no gap is formed between the circumferential surface of the protective case 21 and the circumferential surface of the support columns 61, and a pouring space is formed between the upper end surface of the protective case 21 and the upper end surface of the support columns 61.
The insulating connecting member 4 in a fluid state is poured into the pouring space from the upper end face of the protective shell 2 (i.e. the gap between the protective shell 21 and the fixing member 32), as shown in fig. 16, after the insulating connecting member 4 is cooled and solidified, the insulating connecting member 4 not only fixedly connects the chip and the protective shell 21, but also strengthens the fixation of the signal line 31 and the chip, at this time, the supporting column 61 is pulled out of the protective shell 21, and the chip is taken out of the third positioning hole 611, so that the finished oxygen sensor is obtained, as shown in fig. 1.
Example 3
The embodiment provides a household appliance, comprising an appliance body and the oxygen sensor of embodiment 1; the oxygen sensor is installed on the electric appliance body.
Since the oxygen sensor of embodiment 1 has the housing assembly 2, it can be easily mounted on the home appliance, and at least the problem of high cost of the home appliance caused by the use of the current oxygen sensor for an automobile in the home appliance is solved.
The household appliances can be kitchen household appliances such as a steam box, a micro-steam box, a steam-baking integrated machine, a micro-steam oven and the like.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 described parent features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (20)

1. A manufacturing process of an oxygen sensor is characterized by comprising the following steps:
electrically connecting a chip of the detection unit (1) with a signal wire (31) of the signal wire assembly (3) through a wire bonding tool (5), and obtaining a semi-finished product after the conductive adhesive is cooled and solidified, wherein the signal wire assembly (3) further comprises a fixing piece (32);
the wire bonding tool (5) comprises a tool body (51); the tool body (51) is provided with a first positioning hole (511) for positioning the detection unit (1), a second positioning hole (512) for positioning the fixing piece (32) and a dispensing window (513);
the dispensing windows (513) are communicated with the first positioning hole (511) and the second positioning hole (512) and are used for electrically connecting the chip of the detection unit (1) with the signal line (31) through conductive adhesive;
and sleeving the shell component (2) outside the detection unit (1) to form an annular gap, and installing an insulating connecting piece (4) in the gap for connecting the detection unit (1) and the shell component (2).
2. The manufacturing process of the oxygen sensor according to claim 1, wherein the mounting of the insulating connector (4) in the gap for connecting the detection unit (1) and the housing assembly (2) comprises the following steps:
sleeving a protective shell (21) of the shell assembly (2) on a pouring tool (6), inserting the semi-finished detection unit (1) into the pouring tool (6) arranged in the protective shell (21), forming a pouring space between the protective shell (21) and the pouring tool (6), and enabling part of the chip to be located in the pouring space;
and (3) pouring the insulation connecting piece (4) in the fluid state into the pouring space, and obtaining the oxygen sensor after the insulation connecting piece (4) in the fluid state is cooled and solidified.
3. The manufacturing process of the oxygen sensor according to claim 1, wherein a limiting protrusion (322) is arranged on the fixing member (32) in the circumferential direction, and a limiting groove (514) is further arranged on the tool body (51); the limiting groove (514) is communicated with the second positioning hole (512), and the limiting groove (514) is in limiting connection with the limiting protrusion (322).
4. The manufacturing process of the oxygen sensor according to claim 1, wherein the first positioning hole (511) and the second positioning hole (512) are respectively disposed on two opposite sides of the dispensing window (513), and the first positioning hole (511) and the second positioning hole (512) are coaxially disposed.
5. The manufacturing process of the oxygen sensor according to claim 4, wherein the area of the axial cross section of the second positioning hole (512) is larger than the area of the axial cross section of the first positioning hole (511).
6. The manufacturing process of the oxygen sensor according to claim 2, wherein the filling tool (6) comprises a support column (61), and a third positioning hole (611) is axially formed in the support column (61); the third positioning hole (611) is a blind hole, and the depth of the third positioning hole (611) is smaller than the length of the chip; the height of the supporting column (61) is smaller than that of the protective shell (21).
7. The manufacturing process of the oxygen sensor according to claim 6, wherein there is no gap between the peripheral surface of the protective case (21) and the peripheral surface of the support column (61), and a perfusion space is formed between the upper end surface of the protective shell (21) and the upper end surface of the supporting column (61).
8. The manufacturing process of the oxygen sensor according to claim 6, wherein the perfusion tool (6) further comprises a base (62); a groove (621) is arranged on the base (62), and a limit table (622) is limited by the edge of the groove (621) facing the bottom of the groove (621); the supporting column (61) is vertically arranged in the groove (621).
9. An oxygen sensor for household appliances, characterized by being manufactured by the manufacturing process of the oxygen sensor according to any one of claims 1 to 8, comprising a detection unit (1) for detecting oxygen concentration, a housing assembly (2), a signal wire assembly (3) and an insulating connector (4);
the shell component (2) is sleeved outside the detection unit (1) to form a gap, and the shell component (2) is connected with a household appliance; the detection unit (1) is electrically connected with the signal wire assembly (3); the insulation connecting piece (4) is arranged in the gap and used for connecting the detection unit (1) and the shell component (2).
10. The oxygen sensor according to claim 9, wherein the housing assembly (2) is fitted over the detection unit (1) to form an annular gap.
11. The oxygen sensor according to claim 10, wherein the housing assembly (2) comprises a protective shell (21), and a connecting portion (22) mounted on the protective shell (21);
the protective shell (21) is sleeved outside the detection unit (1) to form the annular gap; the connection part (22) is connected with the household appliance.
12. The oxygen sensor according to claim 11, wherein the protective case (21) is provided with vent holes (211) in a circumferential direction.
13. Oxygen sensor according to claim 11, characterised in that the connection (22) is a flange, which is riveted to the protective casing (21).
14. The oxygen sensor according to claim 9, wherein the detection unit (1) comprises a chip for detecting the oxygen concentration.
15. The oxygen sensor according to claim 9, wherein the signal wire assembly (3) comprises a signal wire (31); the signal wire (31) is electrically connected with the detection unit (1).
16. The oxygen sensor according to claim 15, wherein the signal wire assembly (3) further comprises a fixing member (32); the fixing piece (32) is axially provided with a signal wire positioning hole (321), and one end of the signal wire (31) penetrates through the signal wire positioning hole (321) to be electrically connected with the detection unit (1).
17. The oxygen sensor according to claim 16, wherein the fixing member (32) is provided with a limiting protrusion (322) in the circumferential direction, and a workpiece fitted with the fixing member (32) is provided with a limiting groove (514); or the circumference of the fixing piece (32) is provided with a limiting groove (514), and a workpiece assembled with the fixing piece (32) is provided with a limiting bulge (322).
18. The oxygen sensor according to any one of claims 9 to 17, wherein the insulating connector (4) is further connected to the signal line assembly (3) electrically connected to the detection unit (1).
19. The oxygen sensor according to any one of claims 9 to 17, wherein the detection unit (1) and the signal line assembly (3) are electrically connected by a conductive adhesive.
20. A household appliance comprising an appliance body, and an oxygen sensor according to any one of claims 9 to 19; the oxygen sensor is installed on the electric appliance body.
CN202010966347.7A 2020-09-15 2020-09-15 Oxygen sensor and manufacturing process thereof and household appliance Active CN112229948B (en)

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