CN201575844U - Radio frequency admittance material/liquid level switch - Google Patents

Radio frequency admittance material/liquid level switch Download PDF

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Publication number
CN201575844U
CN201575844U CN2009202132550U CN200920213255U CN201575844U CN 201575844 U CN201575844 U CN 201575844U CN 2009202132550 U CN2009202132550 U CN 2009202132550U CN 200920213255 U CN200920213255 U CN 200920213255U CN 201575844 U CN201575844 U CN 201575844U
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CN
China
Prior art keywords
level switch
radio frequency
electrode
terminal box
frequency admittance
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
Application number
CN2009202132550U
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Chinese (zh)
Inventor
吴定国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI FINE ELECTRONIC CO Ltd
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SHANGHAI FINE ELECTRONIC CO Ltd
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Publication date
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Priority to CN2009202132550U priority Critical patent/CN201575844U/en
Application granted granted Critical
Publication of CN201575844U publication Critical patent/CN201575844U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model provides a radio frequency admittance material/liquid level switch, which comprises a terminal box and an induction bar used for sensing admittance change. The lower end of the terminal box is provided with a through hole, a control circuit is arranged inside the terminal box, the induction bar is disposed into the through hole and electrically connected with the control circuit, the induction bar is fixedly connected with the terminal box through a connection thread joint via a threaded meshing form and further comprises a measuring electrode, a ground electrode and a shielding electrode, and the shielding electrode is respectively separated from the measuring electrode and the ground electrode via a main insulator and a secondary insulator. The radio frequency admittance material/liquid level switch can resolve problems that attachments affect accuracy of signal level, is simple in structure and convenient in installation and maintenance, can be adaptable to various measuring occasions, and has the advantages of strong adaptability and long service life.

Description

Radio frequency admittance formula thing/level switch
Technical field
The utility model relates to a kind of thing/level switch, particularly a kind of radio frequency admittance formula thing/level switch that can be used for liquid, dust or the accurate bit test of granular solids.
Background technology
Thing/level switch is an indispensable important instrument in the commercial production, and it is used for the height of material in the sensing accumulator tank or liquid material.At present, being used for the fixing level switch of sensing mainly is adopt blocking rotary type in the majority, and the blocking rotary type level switch is to utilize rotating blade to judge thing position height, when material rises to leaf position, blade rotation is obstructed, thereby comes the height of sensing thing position according to the changing value of blade resistance.And the leading products of level switch still are the float-ball type level switch at present, and it is to utilize the ball float height that floats on the liquid to measure liquid height.
But, existing thing/level switch, and, all exist following some shortcoming no matter be blocking rotary type level switch or float-ball type level switch:
1, at first after using after a while, on inductive rod, along with the container discharge, produce bridging on the inductive rod, and bridging has changed the initial value of originally setting between measurement electrode and the ground-electrode that holds, and each duplicate measurements can not in time be playbacked, thereby causes the problem of being forbidden that measures.
2, existing thing/level switch complex structure all includes mechanical transmission structure, wearing and tearing can occur after long-term the use, and serviceable life is shorter.
3, existing thing/level switch complex structure, mounting means are loaded down with trivial details, cause the cost of installation and maintenance higher.
4, existing thing/level switch only is applicable in the environment of normal temperature and pressure usually, can't use in some special occasions, has limited to its usable range.
The utility model content
At above-mentioned defective, the purpose of this utility model provides a kind of radio frequency admittance formula thing/level switch, with solve existing thing/level switch weak point in serviceable life, installation and maintenance cost height, the scope of application is little and can't get rid of the problem that attachment influences measuring accuracy.
For achieving the above object, the utility model has adopted following technical scheme:
A kind of radio frequency admittance formula thing/level switch comprises: a terminal box, and its lower end is provided with a through hole, and this terminal box inside is provided with a control circuit; Be used for the inductive rod that the sensing admittance changes, it is arranged in the through hole of described terminal box lower end, and electrically connects with described control circuit; Described inductive rod was connected and fixed with screw engagement and described terminal box by age of a draught animal of continuing; Described inductive rod further comprises: measure electrode, ground-electrode and guarded electrode, wherein, separate with major insulation body and minor insulation body respectively between described guarded electrode and described measurement electrode, the ground-electrode.
According to the described radio frequency admittance formula of the utility model preferred embodiment thing/level switch, it also comprises plurality of strengthening ribs, and those reinforcements are supported on the side of described terminal box.
According to the described radio frequency admittance formula of the utility model preferred embodiment thing/level switch, this terminal box further comprises a box body and a lid again, and this lid and described box body fasten mutually.
According to the described radio frequency admittance formula of the utility model preferred embodiment thing/level switch, this terminal box also further comprises a water proof ring, and it is arranged on the seam crossing of described box body and described lid.
According to the described radio frequency admittance formula of the utility model preferred embodiment thing/level switch, described control circuit also comprises be used for the fail safe alarm modules that sends a warning when material is too high or too low.
According to the described radio frequency admittance formula of the utility model preferred embodiment thing/level switch, described control circuit also comprises the sensitivity adjusting module that is used for regulating measurement sensitivity.
Owing to adopted above technical characterictic, make the utility model with respect to prior art, have following advantage and good effect:
1, the utility model increases guarded electrode measuring between electrode and the ground-electrode, thereby when being implemented in multiple different material and detecting, the influence that not adhered to by material;
2, radio frequency admittance formula thing/level switch of the present utility model is not only applicable to the level gauging of solid, the level gauging that also can be used for liquid, it is to change by the admittance between inductive rod and accumulator tank bucket wall to come sensing thing position height, in the measuring process mechanical drive can not take place, therefore can not produce wearing and tearing, have very long serviceable life;
3, radio frequency admittance formula thing/level switch of the present utility model is simple in structure, and installation and maintenance is all very convenient;
4, radio frequency admittance formula thing/level switch of the present utility model can be regulated measurement sensitivity as required, has very high dirigibility.
Description of drawings
Fig. 1 is a kind of embodiment exploded view of the utility model radio frequency admittance formula thing/level switch;
Fig. 2 is a combination of the present utility model back structural drawing;
Fig. 3 is the application state figure of the utility model radio frequency admittance formula thing/level switch.
Embodiment
Below in conjunction with accompanying drawing, specify the utility model.
See also Fig. 1, it is a kind of embodiment exploded view of the utility model radio frequency admittance formula thing/level switch.This kind radio frequency admittance formula thing/level switch comprises a terminal box 1, and its lower end is provided with a through hole 2, and this terminal box 1 inside is provided with a control circuit 3; Be used for the inductive rod 4 that the sensing admittance changes, it is arranged in the through hole 2 of described terminal box lower end, and electrically connects with described control circuit 3; Described inductive rod 4 was connected and fixed with screw engagement and described terminal box 1 by age of a draught animal 5 of continuing; Described inductive rod further comprises: measure electrode 41, ground-electrode 42 and guarded electrode 43, wherein, separate with major insulation body 44 and minor insulation body 45 respectively between described guarded electrode 43 and described measurement electrode 41, the ground-electrode 42.
Simultaneously with reference to figure 2, terminal box 1 has further comprised box body 11 and lid 12 again, box body 11 and lid 12 fasten mutually, and the seam crossing between box body 11 and the lid 12 also is provided with a water proof ring 15, can improve the sealing of terminal box effectively, prevent that aqueous vapor from entering terminal box and damaging inner control circuit 3.
Described control circuit 3 also further is provided with fail safe alarm modules (not illustrating among the figure) except that having comprised the test signal circuit, in order to when material is too high or too low, send the fail safe alarm; Sensitivity adjusting module (not illustrating among the figure) is in order to regulate the measurement sensitivity of radio frequency admittance formula thing/level switch.By corresponding button trim is set, can control the duty of these modules on the control panel of peripheral hardware.
Please refer to Fig. 3, during use, radio frequency admittance formula thing/level switch is fixed on the appropriate location of 20 barrels of walls of accumulator tank, and make inductive rod 4 be positioned at accumulator tank 20 inside, to measure sensitivity and possess higher sensitivity and reduce blanking and impact the infringement that causes in order to make, inductive rod 4 generally is downward-sloping and keeps suitable angle with horizontal line.When the material in the accumulator tank 20 touches the measurement electrode of inductive rod 4, the admittance meeting that measures between electrode and the ground-electrode changes, radiofrequency signal is exerted an influence, and sensed, and then just can judge the height of material level by the variation of this admittance value by internal circuit.Length that it should be noted that inductive rod 4 can be adjusted according to the actual grade of accumulator tank 20, catering to the needs of various measurements, and reaches the purpose of accurate measurement.
But for material, after service time is of a specified duration, the measurement electrode surface of inductive rod 4 can adhere to a spot of attachment, so just, produce the bridging error, from electrical point, the bridging layer is equivalent to a resistance, and the part that sensing element is covered by bridging is equivalent to a transmission line of being made up of numerous infinitesimal electric capacity and resistive element.
For this reason, the utility model, between measurement electrode and ground-electrode, be provided with guarded electrode, the guarded electrode contact area is much smaller with respect to measuring electrode, and the signal waveform between itself and the ground-electrode and measure signal between electrode and ground-electrode, be identical on electrical point, but both isolate fully, independently, therefore can suppress when inductive rod 4 generation materials own adhere to, measure between electrode and the ground-electrode because material adheres to the admittance variation that is produced, eliminate the false alarm of control circuit, improve measurement sensitivity and degree of accuracy.
Please refer to Fig. 2, the radio frequency admittance formula thing/level switch of present embodiment also includes reinforcement 13, be arranged on the side of terminal box, it makes terminal box partly possess higher intensity (specification of explosion-proof type), thereby can carry out surveying work in some unsettled places.
Radio frequency admittance formula thing/level switch of the present utility model is not only applicable to the level gauging of solid, also can be used for the measurement of liquid level, it is to change by the admittance between inductive rod and accumulator tank bucket wall to come sensing thing position height, in the measuring process mechanical drive can not take place, therefore can not produce wearing and tearing, have very long serviceable life.And, increase guarded electrode measuring between electrode and the ground-electrode, thereby when being implemented in multiple different material and detecting, the influence that not adhered to by material.
In addition, radio frequency admittance formula thing of the present utility model/level switch simple structure, and can further be provided with functional structures such as reinforcement, water proof ring, have the advantage that adaptability is strong, sealing is high.
More than disclosed only be several specific embodiment of the present utility model, but the utility model is not limited thereto, any those skilled in the art can think variation, all should drop in the protection domain of the present utility model.

Claims (6)

1. a radio frequency admittance formula thing/level switch is characterized in that, comprising:
One terminal box, its lower end is provided with a through hole, and this terminal box inside is provided with a control circuit;
Be used for the inductive rod that the sensing admittance changes, it is arranged in the through hole of described terminal box lower end, and electrically connects with described control circuit;
Described inductive rod was connected and fixed with screw engagement and described terminal box by age of a draught animal of continuing;
Described inductive rod further comprises: measure electrode, ground-electrode and guarded electrode, wherein, separate with major insulation body and minor insulation body respectively between described guarded electrode and described measurement electrode, the ground-electrode.
2. radio frequency admittance formula thing/level switch as claimed in claim 1 is characterized in that it also comprises plurality of strengthening ribs, and those reinforcements are supported on the side of described terminal box.
3. radio frequency admittance formula thing/level switch as claimed in claim 1 is characterized in that this terminal box further comprises a box body and a lid again, and this lid and described box body fasten mutually.
4. radio frequency admittance formula thing/level switch as claimed in claim 3 is characterized in that this terminal box also further comprises a water proof ring, and it is arranged on the seam crossing of described box body and described lid.
5. radio frequency admittance formula thing/level switch as claimed in claim 1 is characterized in that, described control circuit also comprises be used for the fail safe alarm modules that sends a warning when material is too high or too low.
6. radio frequency admittance formula thing/level switch as claimed in claim 1 is characterized in that, described control circuit also comprises the sensitivity adjusting module that is used for regulating measurement sensitivity.
CN2009202132550U 2009-12-17 2009-12-17 Radio frequency admittance material/liquid level switch Expired - Lifetime CN201575844U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009202132550U CN201575844U (en) 2009-12-17 2009-12-17 Radio frequency admittance material/liquid level switch

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Application Number Priority Date Filing Date Title
CN2009202132550U CN201575844U (en) 2009-12-17 2009-12-17 Radio frequency admittance material/liquid level switch

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105486374A (en) * 2016-01-18 2016-04-13 上海云鱼智能科技有限公司 Static-dynamic-dual-mode level gage and level measuring method thereof
CN105526989A (en) * 2016-01-18 2016-04-27 上海云鱼智能科技有限公司 Attachment-preventing static mode charge level indicator assisting validation by mechanical action and measuring method of charge level indicator
CN105698899A (en) * 2016-03-31 2016-06-22 上海云鱼智能科技有限公司 Static-gesture dual-mode material level meter and measuring method thereof
CN103900661B (en) * 2014-02-19 2017-01-25 东北电力大学 Segmented liquid level sensor based on capacitance-to-digital conversion technology
CN108109878A (en) * 2017-11-28 2018-06-01 北京航天计量测试技术研究所 A kind of coaxial kinds of point mode liquid-level switch

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103900661B (en) * 2014-02-19 2017-01-25 东北电力大学 Segmented liquid level sensor based on capacitance-to-digital conversion technology
CN105486374A (en) * 2016-01-18 2016-04-13 上海云鱼智能科技有限公司 Static-dynamic-dual-mode level gage and level measuring method thereof
CN105526989A (en) * 2016-01-18 2016-04-27 上海云鱼智能科技有限公司 Attachment-preventing static mode charge level indicator assisting validation by mechanical action and measuring method of charge level indicator
CN105486374B (en) * 2016-01-18 2019-01-04 上海云鱼智能科技有限公司 Quiet dynamic bimodulus level-sensing device and its method for measuring material position
CN105526989B (en) * 2016-01-18 2019-01-04 上海云鱼智能科技有限公司 The verifying of mechanical action auxiliary, anti-bridging static schema level-sensing device and its measurement method
CN105698899A (en) * 2016-03-31 2016-06-22 上海云鱼智能科技有限公司 Static-gesture dual-mode material level meter and measuring method thereof
CN108109878A (en) * 2017-11-28 2018-06-01 北京航天计量测试技术研究所 A kind of coaxial kinds of point mode liquid-level switch

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Granted publication date: 20100908

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