CN204128633U - A kind of liquid level sensor - Google Patents
A kind of liquid level sensor Download PDFInfo
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- CN204128633U CN204128633U CN201420621050.7U CN201420621050U CN204128633U CN 204128633 U CN204128633 U CN 204128633U CN 201420621050 U CN201420621050 U CN 201420621050U CN 204128633 U CN204128633 U CN 204128633U
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Abstract
The utility model provides a kind of liquid level sensor and liquid-level detecting method thereof, described liquid level sensor comprises the conductive unit being arranged on datum-plane position place, for the earthing contact of ground connection, also comprise the whether vicissitudinous capacitive detection module of electric capacity for judging between described conductive unit and described earthing contact.The utility model is by arranging conductive unit at datum-plane position, whether the electric capacity detected in real time between conductive unit and earthing contact by capacitive detection module is changed, thus judge the surface of contact of first medium and second medium be in below reference field or more than, automatization level is high, and sensor installation location is very flexible, installing space is little, and accuracy of detection is high, anti-electromagnetic interference capability is strong.
Description
Technical field
The utility model relates to detection technique field, particularly relates to a kind of liquid level sensor.
Background technology
There is the oil groove depositing machine oil sewing machine inside, and machine oil mainly plays lubrication.If machine oil is once lower than " datum line ", the wearing and tearing of physical construction will be made to aggravate, affect the stable operation of machine.Therefore during sewing machine work, need to carry out machine maintenance maintenance at interval of a period of time, check up Engine oil whether lower than " datum line ".If lower than or close to datum line, then need add machine oil.But under general work state, because the characteristic that groove is airtight, can not Real Time Observation to machine oil whether lower than datum line, when particularly working long hours, once machine oil is lower than datum line, will cause damage to machine, the loss after accumulating over a long period is inestimable.
Oil mass detects and belongs to a kind of level sensing.General level sensing adopts suspension type sensor 8 to utilize the principle of liquid buoyancy to realize level sensing usually, as shown in Figure 1.Such sensor shortcoming is that sensor bulk is large, because need to utilize law of buoyancy, sensor there are certain requirements the liquid level degree of depth, if liquid level is too low, is difficult to effectively detect.Oil mass height inside sewing machine is probably at 20-30mm, and for common liquid level sensor, this degree of depth seems too small, and sensor is difficult to work.
Except suspension type sensor, detect liquid level and also have a kind of double-contact formula sensor 9, as shown in Figure 2.Two contacts of sensor, immerse in liquid.The shortcoming of this sensor has 2: first, and the medium between two contacts needs to have electric conductivity, but the machine oil of sewing machine is nonconducting, and the characteristic of conduction will exist the risk of electric leakage; The second, this sensor needs 2 contacts, and affect the installation location of sensor, namely sensor installation location is dumb.
Summary of the invention
The purpose of this utility model is to provide a kind of liquid level sensor and liquid-level detecting method thereof, it detects the capacitance between conductive unit and earthing contact by capacitive detection module, compared with electric capacity when electric capacity when being then in first medium with earthing contact, earthing contact are in second medium thus determine surface of contact be in more than datum-plane position or below.
According to an aspect of the present utility model, provide a kind of liquid level sensor, for detecting the position in two kinds of non-medium contact faces 1 of dissolving each other, described two kinds of non-media that dissolve each other are first medium 2 and second medium 3, described first medium 2 is positioned at second medium 3 top, and described first medium 2 has different specific inductive capacity from described second medium 3, described liquid level sensor comprises the conductive unit 5 being arranged on reference field 4 position, for the earthing contact 6 of ground connection, also comprise the whether vicissitudinous capacitive detection module 7 of electric capacity for judging between described conductive unit 5 and described earthing contact 6.
Further, described capacitive detection module 7 comprises:
Capacitance signal acquisition module 71, for detecting the electric capacity C between conductive unit 5 and earthing contact 6;
Memory module 72, for storing the value Cn of the electric capacity of different medium;
Comparison module 73, for comparing C and Cn;
Signal output module 74, is in below reference field 4 position or above signal for exporting surface of contact 1 position;
Described memory module 72, comparison module 73, signal output module 74 connect successively, and described comparison module 73 is also connected with described capacitance signal acquisition module 71.
Preferably, described capacitance signal acquisition module 71 is also connected with described memory module 72.
Optionally, described capacitive detection module 71 also comprises the setting module 75 be connected with described memory module 72, for setting the value of the specific inductive capacity of first medium 2 and second medium 3.
Optionally, described first medium 2 is air, and described second medium 3 is oil.
As mentioned above, according to a kind of liquid level sensor of the present utility model and liquid-level detecting method thereof, by arranging conductive unit at datum-plane position, whether the electric capacity detected in real time between conductive unit and earthing contact by capacitive detection module is changed, thus judge the surface of contact of first medium and second medium be in below reference field or more than, automatization level is high, and sensor install location very flexible, installing space is little, and accuracy of detection is high, anti-electromagnetic interference capability is strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of suspension type sensor of the prior art;
Fig. 2 is double-contact formula sensor construction schematic diagram of the prior art;
Fig. 3 is the structural representation of liquid level sensor of the present utility model;
Fig. 4 is the liquid-level detecting method of liquid level sensor of the present utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the utility model is further described.
Fig. 3 is the structural representation of liquid level sensor of the present utility model.
Shown in Figure 3, a kind of liquid level sensor of the present utility model, for detecting the position in two kinds of non-medium contact faces 1 of dissolving each other, described two kinds of non-media that dissolve each other are first medium 2 and second medium 3.Described first medium 2 is positioned at second medium 3 top, and described first medium 2 has different specific inductive capacity from described second medium 3, described liquid level sensor comprises the conductive unit 5 being arranged on reference field 4 position, for the earthing contact 6 of ground connection, also comprise the whether vicissitudinous capacitive detection module 7 of electric capacity for judging between described conductive unit 5 and described earthing contact 6.This conductive unit 5 can be derby or sheet metal etc.
Deposit the oil groove of machine oil for sewing machine, first medium 2 is air, and second medium 3 is machine oil, by arranging conductive unit 5 in reference field 4 position (the specified extreme lower position of fluid of oil groove), when conductive unit 5 is in machine oil, according to formula C=K × ε, electric capacity C2; Subsequently along with the use machine oil of sewing machine constantly reduces, machine oil pasta constantly reduces, until when machine oil pasta is lower than reference field 4 position, conductive unit 5 is made to leave machine oil, enter air, thus make electric capacity C be changed to C1 by original C2, capacitive detection module 7 is according to the change of electric capacity thus judge " which kind of medium conductive unit 5 is in; and then judge that whether machine oil is lower than reference field 4; have automatization level high; and sensor installs location very flexibly, and installing space is little, the advantage that accuracy of detection is high, anti-electromagnetic interference capability is strong.Certain first medium described in the utility model 2 can be also air He Shui, water and wet goods with second medium 3, does not also affect enforcement of the present utility model.
In the present embodiment, described capacitive detection module 7 comprises: capacitance signal acquisition module 71, for detecting the value C of the electric capacity between conductive unit 5 and earthing contact 6; Memory module 72, for storing the value Cn of the electric capacity of different medium; Comparison module 73, for comparing C and Cn; Signal output module 74, is in below reference field 4 position or above signal for exporting surface of contact 1 position; Described memory module 72, comparison module 73, signal output module 74 connect successively, and described comparison module 73 is also connected with described capacitance signal acquisition module 71.The value C of the electric capacity between capacitance signal acquisition module 71 examinations conductive unit 5 and earthing contact 6, then by signal transmission to comparison module 73, by comparison module 73, electric capacity C and C1, C2 are compared, wherein C1 is the capacitance of conductive unit 5 when being in first medium 2, and C2 is the capacitance of conductive unit 5 when being in second medium 3.Thus judge the position in medium contact face 1, then by signal output module 74, position signalling is exported.
Preferably, described capacitance signal acquisition module 71 is also connected with described memory module 72.Capacitance C1 and C2 when can gather when conductive unit 5 is in first medium 2 with acquisition module 71 or be in second medium 3, passes to memory module 72 poke, in order to comparing by the electric capacity collected.
Optionally, described capacitive detection module 71 also comprises the setting module 75 be connected with described memory module 72, for setting the value of the specific inductive capacity of first medium 2 and second medium 3.C1 and C2 can be directly inputted in memory module 72, in order to comparing by setting module 75.
Fig. 4 is the liquid-level detecting method of liquid level sensor.
The utility model also provides a kind of liquid-level detecting method according to the above liquid level sensor, when conductive unit 5 is in first medium 2, the value of the electric capacity between conductive unit 5 and earthing contact 6 is C1, when conductive unit 5 is in second medium 3, the value of the electric capacity between conductive unit 5 and earthing contact 6 is C2; Consult shown in Fig. 4, step comprises;
S1, acquisition C1 and/or C2;
S2, in real time detection are arranged on the value C of the electric capacity between the conductive unit 5 of reference field 4 position and earthing contact 6;
S3, compare C and C1, as C=C1, surface of contact 1 position is in reference field less than 4, and as C ≠ C1, surface of contact 1 position is in reference field more than 4;
Or compare C and C2, as C=C2, surface of contact 1 position is in reference field more than 4, and as C ≠ C2, surface of contact 1 position is in reference field less than 4.
According to the computing formula C=ε × S/d of plate condenser, wherein ε is the dielectric coefficient between two pole plates, different media, and its dielectric coefficient is different, and some dielectric coefficient difference is larger, such as air and machine oil.S represents the area of two pole plates; D represents the vertical range of two pole plates.Because conductive unit 5 is on the reference field 4 in first medium 2 or second medium 3, earthing contact 6 ground connection, position counterpart between conductive unit 5 and earthing contact 6 changes, described d is steady state value, if do not consider the wearing and tearing of conductive unit 5, then can think that the area S of conductive unit 5 is also constant, so electric capacity C=K × ε, wherein K is constant, draw, when conductive unit 5 is in first medium 2, the value of electric capacity C1 is constant, when conductive unit 5 is in second medium 2, the value of electric capacity C2 is also always constant, then when conductive unit 5 is on certain fixing reference field 4, which medium is the value of electric capacity C be only among relevant with conductive unit 5.Describedly whether to be changed by the electric capacity C detected between conductive unit 5 and earthing contact 6, can judge conductive unit 5 whether passive enter another medium from a medium, namely surface of contact 1 position of two media changes.Deposit the oil groove of machine oil for sewing machine, then show as, fluid liquid level drops to below from reference field 4 locality, or below reference field 4, rise to top.If the initial position of conductive unit 5 is in fluid, then can detects fluid and whether be in reference field less than 4, remind staff to refuel.
Preferably, in step S1, electric capacity C1 and/or electric capacity C2 is detected by described capacitive detection module 7 and draws, the oil groove of machine oil is deposited for sewing machine, then show as, first what liquid level sensor was exemplary puts into fluid, capacitive detection module 7 stores as electric capacity C1 after detecting the electric capacity C between conductive unit 5 and earthing contact 6, continue real-time Detection capacitance C and C1 again to compare, when electric capacity C is not equal to electric capacity C1, then can judge that fluid position drops to reference field less than 4, if when first liquid level sensor puts into the air on fluid, capacitance variations detected, then can judge that oil liquid level is set up and rise to reference field more than 4.Optionally, in step S1, electric capacity C1 and/or electric capacity C2 is inputed in described capacitive detection module 7 by outside.
Can judge first medium 2 and the position of the surface of contact 1 of second medium 3 by comparing C and C1 or C and C2, have automatization level high, and sensor installs location very flexibly, installing space is little, the advantage that accuracy of detection is high, anti-electromagnetic interference capability is strong.
Should be understood that, above-mentioned embodiment of the present utility model only for exemplary illustration or explain principle of the present utility model, and is not formed restriction of the present utility model.Therefore, any amendment made when not departing from spirit and scope of the present utility model, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.In addition, the utility model claims be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.
Claims (5)
1. a liquid level sensor, for detecting the position of two kinds of non-medium contact face (1) of dissolving each other, described two kinds of non-media that dissolve each other are first medium (2) and second medium (3), described first medium (2) is positioned at second medium (3) top, and described first medium (2) has different specific inductive capacity from described second medium (3), it is characterized in that: described liquid level sensor comprises the conductive unit (5) being arranged on reference field (4) position, for the earthing contact (6) of ground connection, also comprise the whether vicissitudinous capacitive detection module (7) of electric capacity for judging between described conductive unit (5) and described earthing contact (6).
2. liquid level sensor according to claim 1, is characterized in that: described capacitive detection module (7) comprising:
Capacitance signal acquisition module (71), for detecting the value C of the electric capacity between conductive unit (5) and earthing contact (6);
Memory module (72), for storing the value Cn of different medium electric capacity;
Comparison module (73), for comparing C and Cn;
Signal output module (74), is in below reference field (4) position or above signal for exporting surface of contact (1) position;
Described memory module (72), comparison module (73), signal output module (74) connect successively, and described comparison module (73) is also connected with described capacitance signal acquisition module (71).
3. liquid level sensor according to claim 2, is characterized in that: described capacitance signal acquisition module (71) is also connected with described memory module (72).
4. liquid level sensor according to claim 2, it is characterized in that: described capacitive detection module (71) also comprises the setting module (75) be connected with described memory module (72), for setting the value of the specific inductive capacity of first medium (2) and second medium (3).
5. the liquid level sensor according to any one of claim 3 or 4, is characterized in that: described first medium (2) is air, and described second medium (3) is oil.
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| CN201420621050.7U CN204128633U (en) | 2014-10-24 | 2014-10-24 | A kind of liquid level sensor |
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| CN201420621050.7U CN204128633U (en) | 2014-10-24 | 2014-10-24 | A kind of liquid level sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296830A (en) * | 2014-10-24 | 2015-01-21 | 杰克缝纫机股份有限公司 | Liquid level sensor and liquid level detection method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296830A (en) * | 2014-10-24 | 2015-01-21 | 杰克缝纫机股份有限公司 | Liquid level sensor and liquid level detection method thereof |
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Address after: 318000 no.1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318000 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |
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| CP03 | Change of name, title or address |