CN202188883U - Liquid level sensor device - Google Patents
Liquid level sensor device Download PDFInfo
- Publication number
- CN202188883U CN202188883U CN2011201833692U CN201120183369U CN202188883U CN 202188883 U CN202188883 U CN 202188883U CN 2011201833692 U CN2011201833692 U CN 2011201833692U CN 201120183369 U CN201120183369 U CN 201120183369U CN 202188883 U CN202188883 U CN 202188883U
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- CN
- China
- Prior art keywords
- circuit board
- coil
- box
- lid
- liquid level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Level Indicators Using A Float (AREA)
Abstract
The utility model discloses a liquid level sensor device, comprising a rotating shaft, a magnetism conducting piece, a cylindrical coil and a circuit board. The liquid level sensor device is characterized in that the circuit board is enveloped in a sealed box, wherein the sealed box is formed by stamping a box cover and a box bottom, seal tin is enveloped on a pressing forming line of the box cover and the box bottom, at least one lead wire hole is arranged on the box cover, a plurality of conductive metal wires are welded on the circuit board, the conductive metal wires penetrate out of the lead wire holes, and a plurality of gaps between the conductive metal wires and the lead wire holes are sintered with a plurality of seal glass balls. The liquid level sensor device has the beneficial effects that the circuit board is completely enveloped in the sealed box, and a box body is good in sealing property, so that the liquid permeation and the external electromagnetic interference can be effectively avoided, safeguard for a sensor to work in a liquid environment for a long time can be offered, and the accuracy and the stability can be simultaneously improved.
Description
Technical field
The utility model relates to sensor technology, specifically, is a kind of level sensing apparatus.
Background technology
A large amount of sensors all need be in the medium that is not suitable for circuit board work acquired signal, for example methanol gasoline sensor, corrosive goods level sensor have the medium sensor of electrolytic effect.Because the influence of these media if circuit board is also dropped into wherein, can't stably be worked.
Known, the solution that such sensor adopts is: take split-type structural, sensor totally is made up of sensing element and circuit board two major parts; Be connected through long lead-in wire between sensing element and the circuit board; During work, circuit board is positioned at beyond the actuating medium, only sensing element is installed in the actuating medium; Such sensor is actually a kind of split-type structural, and integrated, miniaturization, the signal Processing that can not reach that modern sensor requires are integrated.
Known, such sensor also adopts a kind of scheme of integrally closed: sensing element and circuit board all are encapsulated in the same closed shell, and through airtight good lead-in wire is set on housing, are connected with higher level's Circuits System again.But in the prior art; Usually all be to adopt some simple plastic devices that sealing is installed, if but in the liquid working environment of HTHP, such packaging technology often causes the liquid infiltration; Make the circuit board cisco unity malfunction, even short circuit phenomenon can occur.
The utility model content
The purpose of the utility model provides a kind of level sensing apparatus; Realize that sensing element and circuit board are placed in the detection medium simultaneously, sensing element contacts with detecting medium, and circuit board is isolated with enclosure; Circuit board layout is in the position near sensing element; Transducing signal is stable, detects accurately, and the security performance of system is good.
For achieving the above object, the utility model provides a kind of level sensing apparatus, comprise rotation axis, magnetic conduction sheet, tubular coil and circuit board; One end of said magnetic conduction sheet is connected on the rotation axis; The other end of this magnetic conduction sheet inserts in the cavity of said tubular coil, and said tubular coil is electrically connected with circuit board, and its key is: said circuit board is encapsulated in the airtight closed enclosure; This closed enclosure is closed by lid and box base pressure and forms; Being pressed at the bottom of lid and box is packaged with sealing tin (5c) on the molded lines, lid is provided with at least one fairlead, is welded with conductive wire on the said circuit board; This conductive wire passes said fairlead, and the gap sintering between conductive wire and the fairlead has the seal glass pearl.
Said tubular coil comprises first coil and second coil; Be welded with 6 conductive wires on the said circuit board; Respectively as power lead, signal wire, the first coil connecting line, the second coil connecting line, the first wire loop line and the second wire loop line; Said first coil is connected between the first coil connecting line and the first wire loop line, and second coil is connected between the second coil connecting line and the second wire loop line.
Be filled with sealant between the buckling surface at the bottom of said lid and the box.
Said sealant is polymeric seal circle or solder(ing) paste.
Be filled with macromolecular compound in the box body of closed enclosure.
The remarkable result of the utility model is: the circuit board in the sensor device is encapsulated in the airtight can fully; This closed enclosure adopts kinds of processes such as glass sintering, mechanical pressing, elastomeric seal, polymkeric substance are filled, welding, envelope tin to carry out compound encapsulation; Make the good seal performance of box body; The sealing effect that reliability is high, reach airtight level can effectively prevent the infiltration and the external electromagnetic interference of liquid and gas, for the sensor long-term work provides safety guarantee in liquid environment; Improved accuracy and stability simultaneously, it is applicable to induction liquid level sensor dragon.This packaged type has solved the sealing property and the cost problem of long-term puzzlement traditional liquid level sensor, for such sensor provides the encapsulation solution to electronization, integrated direction development.
Description of drawings
Fig. 1 is the mounting structure synoptic diagram of the utility model;
Fig. 2 is the vertical view after lid is offered fairlead;
Fig. 3 is the cut-open view behind the lid glass sintering;
Fig. 4 is the vertical view at the bottom of the box;
Fig. 5 is the cut-open view at the bottom of the box;
Fig. 6 is the cut-open view after the punching press at the bottom of lid and the box;
Fig. 7 is the vertical view behind lid and the box underseal tin;
Fig. 8 is the partial enlarged drawing at machinery pressing edge at the bottom of lid and the box.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further explain.
As shown in Figure 1, a kind of level sensing apparatus that utilizes said method to carry out the circuit board encapsulation comprises rotation axis 1, magnetic conduction sheet 2, tubular coil 3 and circuit board 4; One end of said magnetic conduction sheet 2 is connected on the rotation axis 1, and the other end of this magnetic conduction sheet 2 inserts in the cavity of said tubular coil 3, and said tubular coil 3 is electrically connected with circuit board 4; The other end of rotation axis 1 connects float through axostylus axostyle, rotates along with liquid level up-down float drives rotation axis 1, makes magnetic conduction sheet 2 rotations on the rotation axis 1; Because magnetic conduction sheet 2 is inserted in the tubular coil 3, the different angle of magnetic conduction sheet 2 rotations, the degree of depth that is inserted in the tubular coil 3 is then different; Thereby influence the electrical parameter of tubular coil 3; The relevant parameters testing circuit is set on circuit board 4, can changes liquid level signal into electric signal, thereby realize that liquid level detects.
Like Fig. 2-shown in Figure 8; Said circuit board 4 is encapsulated in the closed enclosure 5, this closed enclosure 5 by lid 5a and box at the bottom of the 5b pressing form, being pressed into of 5b is packaged with sealing tin 5c on the molded lines at the bottom of lid 5a and box; Lid 5a is provided with six fairlead 5d; Be welded with conductive wire on the said circuit board 4, this conductive wire passes said fairlead 5d, and the gap sintering between conductive wire and the fairlead 5d has seal glass pearl 5e.
Said tubular coil 3 comprises the first coil 3a and the second coil 3b; Be welded with 6 conductive wires on the said circuit board 4; Respectively as power lead V, signal wire S, the first coil connecting line V1, the second coil connecting line V2, the first wire loop line G1 and the second wire loop line G2; The said first coil 3a is connected between the first coil connecting line V1 and the first wire loop line G1, and the second coil 3b is connected between the second coil connecting line V2 and the second wire loop line G2.
Tubular coil 3 is made up of the first coil 3a and the second coil 3b, can treat as a transformer, also can treat as a coupling mechanism; Utilize electromagnetic induction principle; Magnetic conduction sheet 2 insert tubular coils 3 effect of depth the induction coefficient of coil, power lead V is as the electrode input end of external circuit, the second wire loop line G2 is as the negative input of external circuit; To sensor power supply is provided through external circuit; Circuit board 4 is loaded into first voltage on the first coil 3a, and the coupled voltages that detects the second coil 3b two ends through treatment circuit can be differentiated the degree of depth of magnetic conduction sheet 2, and the degree of depth of magnetic conduction sheet 2 has reflected the height of liquid level again; Detected voltage signal passes to external circuit through signal wire S and carries out data processing, thereby obtains liquid level information.
In order to strengthen the impermeability of can 5; Be filled with sealant 5f between the 5b at the bottom of said lid 5a and the box; Sealant 5f both can adopt the O-ring seal of macromolecular material, also can adopt solder(ing) paste, and solder(ing) paste runs into high temperature melting in envelope tin process; Thereby the slit at the bottom of filling lid 5a and the box between the 5b, the impermeability of intensifier.
Be filled with macromolecular compound 5g in the box body of closed enclosure 5, being used for this macromolecular compound is resistant to elevated temperatures animi resin material.
The principle of work of the utility model is:
Drive axostylus axostyle through float; Magnetic conduction sheet 2 on the rotation axis 1 is rotated, and magnetic conduction sheet 2 is inserted in the tubular coil 3, the degree of depth that the angle magnetic conduction sheet 2 that magnetic conduction sheet 2 rotates inserts; Induction coefficient between the degree of depth decision coil of magnetic conduction sheet 2 in coil; Different induction coefficients can detect the different circuits parameter, can change liquid level signal into electric signal through the treatment circuit on the circuit board 4, thereby realizes that liquid level detects.
Adopt maturation process such as glass sintering, pressing, envelope tin that circuit board is encapsulated; Make sensing element and circuit board 4 to be dropped in jointly in the actuating medium, sensing element can contact with actuating medium, and the intact part of circuit is operated in the airtight chamber; Circuit between circuit board 4 and the sensing element is shorter; The signal of sensing element is incorporated on the circuit board 4 in the closed enclosure 5 through the electrical connection of isolating, and transmission range is short, signal stabilization; The power supply of circuit board 4, output signal are also drawn enclosure 5 through the electrical connection of isolating; Finally be connected, effectively prevented the immersion and extraneous electromagnetic interference (EMI) of liquid, guaranteed that sensor device can long-term stable operation with the external system circuit.
Claims (5)
1. level sensing apparatus; Comprise rotation axis (1), magnetic conduction sheet (2), tubular coil (3) and circuit board (4), an end of said magnetic conduction sheet (2) is connected on the rotation axis (1), and the other end of this magnetic conduction sheet (2) inserts in the cavity of said tubular coil (3); Said tubular coil (3) is electrically connected with circuit board (4); It is characterized in that: said circuit board (4) is encapsulated in the closed enclosure (5), and this closed enclosure (5) is formed by lid (5a) and (5b) pressing at the bottom of the box, is packaged with sealing tin (5c) on the molded lines lid (5a) and being pressed into of (5b) at the bottom of the box; Lid (5a) is provided with at least one fairlead (5d); Said circuit board is welded with conductive wire on (4), and this conductive wire passes said fairlead (5d), and the gap sintering between conductive wire and the fairlead (5d) has seal glass pearl (5e).
2. level sensing apparatus according to claim 1; It is characterized in that: said tubular coil (3) comprises first coil (3a) and second coil (3b); Be welded with 6 conductive wires on the said circuit board (4); Respectively as power lead (V), signal wire (S), the first coil connecting line (V1), the second coil connecting line (V2), the first wire loop line (G1) and the second wire loop line (G2); Said first coil (3a) is connected between the first coil connecting line (V1) and the first wire loop line (G1), and second coil (3b) is connected between the second coil connecting line (V2) and the second wire loop line (G2).
3. level sensing apparatus according to claim 1 is characterized in that: be filled with sealant (5f) at the bottom of said lid (5a) and the box between the buckling surface of (5b).
4. level sensing apparatus according to claim 3 is characterized in that: said sealant (5f) is polymeric seal circle or solder(ing) paste.
5. level sensing apparatus according to claim 1 is characterized in that: be filled with macromolecular compound (5g) in the box body of said closed enclosure (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201833692U CN202188883U (en) | 2011-06-01 | 2011-06-01 | Liquid level sensor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201833692U CN202188883U (en) | 2011-06-01 | 2011-06-01 | Liquid level sensor device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202188883U true CN202188883U (en) | 2012-04-11 |
Family
ID=45920327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201833692U Expired - Lifetime CN202188883U (en) | 2011-06-01 | 2011-06-01 | Liquid level sensor device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202188883U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231940A (en) * | 2011-06-01 | 2011-11-02 | 蒋勤舟 | Packaging method of circuit board and liquid level sensor device using same |
| CN113557410A (en) * | 2019-03-20 | 2021-10-26 | 纬湃技术有限公司 | Angle detection device |
-
2011
- 2011-06-01 CN CN2011201833692U patent/CN202188883U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231940A (en) * | 2011-06-01 | 2011-11-02 | 蒋勤舟 | Packaging method of circuit board and liquid level sensor device using same |
| CN113557410A (en) * | 2019-03-20 | 2021-10-26 | 纬湃技术有限公司 | Angle detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120411 Effective date of abandoning: 20130410 |
|
| RGAV | Abandon patent right to avoid regrant |