CN115692097A - Intelligent electronic liquid level switch and control method thereof - Google Patents
Intelligent electronic liquid level switch and control method thereof Download PDFInfo
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- CN115692097A CN115692097A CN202211560506.9A CN202211560506A CN115692097A CN 115692097 A CN115692097 A CN 115692097A CN 202211560506 A CN202211560506 A CN 202211560506A CN 115692097 A CN115692097 A CN 115692097A
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Abstract
The invention discloses an intelligent electronic liquid level switch, which relates to the technical field of liquid level sensors and comprises a shell and a sensing control assembly arranged in the shell, wherein the sensing control assembly comprises a metal induction coil used for sensing admittance change, a control circuit board electrically connected with the metal induction coil and an insulating layer used for sealing and wrapping the metal induction coil and the control circuit board, and a radio frequency generation module used for transmitting radio frequency signals, a processing module used for processing admittance signals and a control output module used for outputting control signals are arranged on the control circuit board. The control method comprises an initial setting step and a detection control step, and can reduce control signal errors caused by hanging errors by setting the range of admittance values and improve the precision of switching actions. The invention has the advantages of simple structure, high structural strength, wide application range and high practicability.
Description
Technical Field
The invention relates to the technical field of liquid level sensors, in particular to an intelligent electronic liquid level switch and a control method thereof.
Background
The liquid level switch is an indispensable important instrument in industrial production, and at present, the liquid level switches for sensing and fixing mainly include a floating ball liquid level switch, an electrode type liquid level switch, an ultrasonic liquid level switch and a pressure type liquid level sensor, but the liquid level switches mainly have the following defects: the mechanical reciprocating action of the float ball liquid level switch is easy to generate fatigue, the occupied space is large, the float ball liquid level switch cannot float when materials are hung, and the float ball liquid level switch cannot be used when the water level is shallow; the electrode type liquid level switch detects the liquid level by utilizing the conductivity of the liquid, and the electrode is easy to adhere to scale to cause failure and cannot be used in non-conductive liquid such as pure water or oil; the ultrasonic liquid level switch has a blind area, and signals are interfered or lost occasionally in sensing; pressure type level sensor has the response hole, relies on the pressure of water to detect, and the hole that takes place to block up then can't respond to water pressure and lead to failing when the response.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides an intelligent electronic liquid level switch and a control method thereof, wherein the intelligent electronic liquid level switch is simple in structure, high in structural strength, wide in application range and high in practicability.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides an intelligence electronic type liquid level switch, includes the casing and set up in sensing control assembly in the casing, sensing control assembly including be used for the sensing admittance change metal induction coil, with metal induction coil electric connection's control circuit board and be used for with metal induction coil with the insulating layer of the sealed parcel of control circuit board, wherein be equipped with the radio frequency generation module that is used for transmitting radio frequency signal on the control circuit board, be used for handling admittance signal's processing module and be used for output control signal's control output module.
As a further improvement of the technical scheme:
the casing is including being used for with the linkage segment of being connected basic fixed connection and being used for the detection section with the measured object material contact, be provided with external connection screw thread on the lateral wall of linkage segment.
The sensing control assembly is sleeved in the detection section, the metal induction coil is positioned on one side close to the bottom of the detection section, and the control circuit board is positioned on one side far away from the bottom of the detection section.
The metal induction coil is of a spring-shaped structure or a cylindrical structure.
The control circuit board is provided with a power positive wire, a power negative wire and a signal output wire, wherein the power positive wire, the power negative wire and the signal output wire penetrate out of the insulating layer.
The insulating layer is an integrally formed structure formed by filling insulating materials.
The insulating material is any one of epoxy resin, silica gel and waterproof glue.
A control method of an intelligent electronic liquid level switch comprises the following steps:
(S1) respectively placing an intelligent electronic liquid level switch in air and liquid, and respectively obtaining an admittance value X sensed for the first time and an admittance value Y sensed for the second time;
(S2) the processing module compares the admittance value X with the admittance value Y, wherein the admittance value with a larger value is set as the admittance value L in the liquid, and the admittance value with a smaller value is set as the admittance value A in the air;
(S3) alternately replacing the sensing positions of the intelligent electronic liquid level switch, respectively obtaining admittance values L in the liquid for N times, and calculating an average value L avg Is prepared by mixing L avg The range of values of + -10% is set as the range of admittance values in the liquid; obtaining admittance values A in the air for N times, and calculating an average value A avg， A is avg The numerical range of ± 30% is set as the admittance value range in air;
(S4) the intelligent electronic liquid level switch works to obtain the sensed admittance value Z, and the processing module enables the admittance values Z and L to work avg The comparison is carried out in a numerical range of +/-10%, if the admittance value Z is located at L avg If the numerical value is +/-10%, judging that the liquid level switch is positioned in the liquid; if the admittance value Z is not in L avg If the numerical value is +/-10%, skipping to the next step;
(S5) the processing module compares the admittance values Z and A avg The comparison is carried out in the numerical range of +/-30%, if the admittance value Z is positioned at A avg If the numerical value is +/-30%, the liquid level switch is judged to be positioned in the air; if the admittance value Z is not in A avg If the numerical value is within +/-30%, jumping to the step (S4).
As a further improvement of the technical scheme:
in the step (S3), N is 10 or more.
Compared with the prior art, the invention has the advantages that:
(1) The intelligent electronic liquid level switch comprises a shell and a sensing control assembly, wherein the sensing control assembly comprises a metal induction coil and a control circuit board which are used for sensing admittance change, the metal induction coil and the control circuit board are connected into a whole through an insulating layer, the structural strength of the sensing control assembly can be effectively improved, the structure is simple, the size is small, the occupied space is small, and mechanical action is not needed.
(2) According to the control method of the intelligent electronic liquid level switch, the admittance value in the liquid is sensed for multiple times and the average value is calculated, the admittance value in the air is sensed for multiple times and the average value is calculated, the corresponding admittance value judgment range is set according to the average value, the sensed admittance value has deviation due to hanging errors caused by the fact that an attachment layer formed by floaters is attached to the detection section, control signal errors caused by the hanging errors can be reduced by setting the admittance value range, and the precision of the switching action is improved.
Drawings
Fig. 1 is a schematic diagram of a half-section structure of an intelligent electronic liquid level switch.
Fig. 2 is a schematic structural diagram of the sensing control assembly.
Fig. 3 is a schematic structural diagram of the housing.
FIG. 4 is a logic flow diagram of a control method of the intelligent electronic level switch.
Illustration of the drawings:
1. a housing; 101. a connecting section; 102. a detection section; 2. a sensing control component; 201. a metal induction coil; 202. a control circuit board; 2021. a power supply positive line; 2022. a power supply negative electrode line; 2023. a signal output line; 203. an insulating layer.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1 to fig. 3, the intelligent electronic liquid level switch of the present embodiment includes a housing 1 and a sensing control assembly 2 disposed in the housing 1, wherein the sensing control assembly 2 includes a metal induction coil 201 for sensing admittance change, a control circuit board 202 electrically connected to the metal induction coil 201, and an insulating layer 203 for hermetically wrapping the metal induction coil 201 and the control circuit board 202, and the control circuit board 202 is provided with a radio frequency generation module (not shown in the figure) for transmitting a radio frequency signal, a processing module (not shown in the figure) for processing the admittance signal, and a control output module (not shown in the figure) for outputting a control signal. This intelligence electronic type liquid level switch includes casing 1 and sensing control assembly 2, sensing control assembly 2 is including being used for sensing metal induction coil 201 and the control circuit board 202 that admittance changes, connect metal induction coil 201 and control circuit board 202 into a whole through insulating layer 203, can effectively improve sensing control assembly 2's structural strength, moreover, the steam generator is simple in structure, small in size, the occupation space is little, and need not carry out mechanical action, sensing control assembly 2 utilizes the radio frequency admittance principle, the radio frequency generation module transmission radio frequency signal by on the control circuit board 202, metal induction coil 201 is as the sensing element, the signal change that arouses from the liquid level dielectric constant feeds back to processing module, after this change signal is handled, drive control output module output control signal, need not electrically conductive just can respond to, normally use in the non-conductive liquid such as pure water or oils, the blind area does not, signal interference or loss can not appear, have liquid just to respond to, it is irrelevant with pressure, also can use when the water level is shallow, application scope is wide, therefore, the clothes hanger is strong in practicability.
Preferably, the housing 1 comprises a connecting section 101 for fixedly connecting with a connecting base and a detecting section 102 for contacting with a measured material, and an external connecting thread is arranged on an outer side wall of the connecting section 101. In this embodiment, the casing 1 is provided with the connecting section 101, and the casing 1 is fixedly connected with the container wall or is installed and connected with the sleeve in a threaded connection manner, so that the connecting structure has the advantages of simple structure, reliable connection and convenience in disassembly and assembly.
Preferably, the sensing control assembly 2 is sleeved in the detection section 102, the metal induction coil 201 is located at a side close to the bottom of the detection section 102, and the control circuit board 202 is located at a side far from the bottom of the detection section 102. In other embodiments, sensing control assembly 2 and casing 1 can also adopt the mode of dismantling to be connected, and installation and dismantlement convenient and fast can carry out the replacement of casing 1 according to the nature of measured object material, and for example the measured object material has corrosivity, can pertinence choose casing 1 that corrosion protection is good for use, satisfies multiple production demand.
Preferably, the metal induction coil 201 has a spring-like structure or a cylindrical structure.
Preferably, the control circuit board 202 is provided with a power positive line 2021, a power negative line 2022 and a signal output line 2023, and the power positive line 2021, the power negative line 2022 and the signal output line 2023 are disposed to penetrate through the insulating layer 203. In this embodiment, the positive power line 2021 and the negative power line 2022 supply power to the control circuit board 202, and the signal output line 2023 is used for transmitting a control signal output by the control output module to implement a switching operation control function.
Preferably, the insulating layer 203 is an integrally molded structure filled with an insulating material. In this embodiment, the metal induction coil 201 and the control circuit board 202 are filled and wrapped by a liquid insulating material and are cured into an integrally formed insulating layer 203, which has the advantage of good sealing performance and can effectively prolong the service life of the sensing control assembly 2.
Preferably, the insulating material is any one of epoxy resin, silica gel and waterproof glue. In this embodiment, the insulating material is epoxy resin, which has the advantages of good mechanical properties, excellent adhesion properties, small curing shrinkage, good stability, and low cracking tendency.
In the present embodiment, the sensing control module 2 adopts the level control principle of radio frequency admittance, which means the inverse of impedance in the electricity, and is composed of resistive component, capacitive component and inductive component, and the radio frequency is the high frequency radio spectrum, so the radio frequency admittance can be understood as measuring admittance by using high frequency radio wave. In the practical application process, the intelligent electronic liquid level switch is installed at a proper position of a container wall, the detection section 102 is located inside the container wall, the radio frequency generation module on the control circuit board 202 emits radio frequency signals, the metal induction coil 201, the container wall and a detected medium form admittance values, when the liquid level changes and the medium and the metal induction coil 201 are opposite, the admittance values change, the metal induction coil 201 sends signals to the processing module after sensing the admittance changes, the signals are sent to the control output module after being processed by the processing module, and the control output module outputs control signals to complete the control work of the liquid level switch.
When dirt and viscous liquid, such as excrement of human and animal septic tanks, viscous medicament water and the like, exist on the liquid surface of the intelligent electronic liquid level switch, after the intelligent electronic liquid level switch is used for a period of time, an attachment layer formed by the dirt and the viscous liquid can be attached to the detection section 102, hanging errors can be generated, the measurement accuracy is influenced, and the automatic opening and closing action of the liquid level is difficult to control.
As shown in fig. 4, a control method of an intelligent electronic liquid level switch includes the following steps:
(S1) respectively placing an intelligent electronic liquid level switch in air and liquid, and respectively obtaining an admittance value X sensed for the first time and an admittance value Y sensed for the second time;
(S2) the processing module compares the admittance value X with the admittance value Y, wherein the admittance value with a larger value is set as the admittance value L in the liquid, and the admittance value with a smaller value is set as the admittance value A in the air;
(S3) alternately replacing the sensing positions of the intelligent electronic liquid level switch, respectively obtaining admittance values L in the liquid for N times, and calculating an average value L avg Is prepared by mixing L avg The range of values of + -10% is set as the range of admittance values in the liquid; obtaining admittance values A in the air for N times, and calculating an average value A avg， A is avg The numerical range of ± 30% is set as the admittance value range in air;
(S4) the intelligent electronic liquid level switch works to obtain the sensed admittance value Z and processModule will admittance value Z and L avg The comparison is carried out in a numerical range of +/-10%, if the admittance value Z is located at L avg If the numerical range is +/-10%, the liquid level switch is judged to be positioned in the liquid; if the admittance value Z is not at L avg If the numerical value is +/-10%, skipping to the next step;
(S5) the processing module compares the admittance values Z and A avg The comparison is carried out in a numerical range of +/-30%, and if the admittance value Z is located at A avg If the numerical value is +/-30%, the liquid level switch is judged to be positioned in the air; if the admittance value Z is not in A avg If the numerical value is within +/-30%, jumping to the step (S4).
In this embodiment, the steps (S1) to (S3) are initial setting steps, and the steps (S4) to (S5) are detection control steps, specifically, the admittance values in different liquids are different, and the admittance value in the liquid is greater than the admittance value in the air, before the intelligent electronic liquid level switch is applied to different liquids, the admittance values in the liquid and the air need to be sensed respectively, if the initial sensing is performed in the air (or the liquid), and the initial sensed admittance value X is recorded, the re-sensing is performed in the liquid (or the air), and the re-sensed admittance value Y is recorded; since the processing module cannot know whether the initially sensed admittance value X is measured in air or liquid, the processing module needs to compare the admittance value X with the admittance value Y, where the admittance value X with a larger value is set as the admittance value L in liquid and the admittance value Y with a smaller value is set as the admittance value a in air, and if the initially sensed admittance value X is the admittance value L (or a) in liquid (or air) and the secondarily sensed admittance value Y is the admittance value a (or L) in air (or liquid), the first, third, fifth, 8230are set, the secondary admittance value data is L8230 (or a), the second, fourth, sixth, eighth, 8230, the secondary admittance value data is a (or L); the intelligent electronic liquid level switch is alternately replaced by N times of sensing positions to obtain a data set L 1 、L 2 ……L N Calculating the average value L avg Is prepared by mixing L avg The range of + -10% is set as the range of admittance values in the liquid, resulting in data set A 1 、A 2 ……A N Calculating the average value A avg， A is avg The numerical range of ± 30% is set as the admittance value range in air. This control method of intelligence electronic type liquid level switch, through the admittance value in the sensing liquid many times and calculate the average value, the admittance value in the sensing air many times and calculate the average value, set for corresponding admittance value according to the average value and judge the scope, because can be attached to on the detection section 102 filth, the adhesion layer that viscous liquid formed, produce the bridging error, the admittance value that leads to the sensing has the deviation, can avoid the control signal judgement mistake that the bridging leads to through setting for admittance value scope, improve the degree of accuracy of switching action.
In practical application, when the intelligent electronic liquid level switch is used for controlling the upper limit switch of the liquid level, the detection section 102 is in contact with the liquid and senses the liquid to obtain the admittance value Z 1 The processing module then compares the admittance value Z with a threshold value 1 Range of admittance values L with liquid avg Comparison is made at. + -. 10% if Z 1 At L avg If the Z value is within +/-10%, the liquid level switch is judged to be positioned in the liquid, the control output module outputs a control signal to prevent the liquid level from continuously rising, and if the Z value is within the range of +/-10%, the liquid level switch is judged to be positioned in the liquid, the control output module outputs a control signal to prevent the liquid level from continuously rising 1 Is not at L avg In the range of ± 10%, the admittance value Z is continuously sensed without switching. Specifically, when the detection section 102 has an adhesive layer, the admittance value Z of the detection section 102 when it is in contact with the liquid is determined 1 Is not equal to L avg To cause the control signal not to be reported, and to cause the overflow accident, therefore, the L is set avg The error caused by hanging material errors can be effectively reduced by a numerical range of +/-10%.
When the intelligent electronic liquid level switch is used for controlling the liquid level lower limit switch, the liquid level drops to the detection section 102, contacts with air and is sensed to obtain the admittance value Z 2 When the processing module firstly inputs the admittance value Z 2 Range of admittance values L with liquid avg Comparison was carried out at. + -. 10%, Z 2 Is not at L avg Within a range of +/-10%, and then adding the admittance value Z 2 Range of admittance values with air a avg Comparison is carried out at + -30%, if Z 2 At A avg If the Z value is within +/-30%, the liquid level switch is judged to be positioned in the air, the control output module outputs a control signal to prevent the liquid level from continuously descending, and if the Z value is within the range of +/-30 percent, the liquid level switch is controlled to be positioned in the air, the control output module outputs a control signal to prevent the liquid level from continuously descending 2 Is not in A avg In the range of +/-30%Then, the admittance value Z is continuously sensed without performing a switching action. Specifically, when the detection section 102 has an adhesion layer (such as algae), the surface of the detection section 102 is kept wet when the detection section 102 is above the liquid level, which is likely to cause the processing module to erroneously determine that the detection section 102 is still in the liquid, so that the determination range of the admittance value in the air is expanded to a avg The numerical range of +/-30 percent can effectively avoid judgment errors caused by hanging materials.
Preferably, in step (S3), N is 10 or more. In this embodiment, in order to reduce the detection error of the intelligent electronic liquid level switch in the initial setting step, the sensing frequency N is at least 10 times, and the accuracy of the value range of the admittance value is improved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. Modifications and variations that may occur to those skilled in the art without departing from the spirit and scope of the invention are to be considered as within the scope of the invention.
Claims (9)
1. The utility model provides an intelligence electronic type liquid level switch, its characterized in that, including casing (1) with set up in sensing control assembly (2) in casing (1), sensing control assembly (2) including be used for sensing the metal induction coil (201) that admittance changes, with metal induction coil (201) electric connection's control circuit board (202) and be used for with metal induction coil (201) with control circuit board (202) seal-packed insulating layer (203), wherein be equipped with the radio frequency that is used for transmitting radio frequency signal on control circuit board (202) and take place the module, be used for handling the processing module of admittance signal and be used for the control output module of output control signal.
2. The intelligent electronic liquid level switch according to claim 1, wherein the housing (1) comprises a connecting section (101) fixedly connected with a connecting base and a detecting section (102) contacted with a measured material, and an external connecting thread is arranged on the outer side wall of the connecting section (101).
3. The intelligent electronic liquid level switch according to claim 2, wherein the sensing control assembly (2) is sleeved in the detection section (102), the metal induction coil (201) is located at a side close to the bottom of the detection section (102), and the control circuit board (202) is located at a side far away from the bottom of the detection section (102).
4. The intelligent electronic level switch of claim 3, wherein the metal induction coil (201) is of a spring-like or cylindrical structure.
5. The intelligent electronic liquid level switch according to claim 4, wherein the control circuit board (202) is provided with a positive power line (2021), a negative power line (2022) and a signal output line (2023), and the positive power line (2021), the negative power line (2022) and the signal output line (2023) are arranged through the insulating layer (203).
6. The intelligent electronic liquid level switch of claim 5, wherein the insulating layer (203) is an integrally formed structure filled with an insulating material.
7. The intelligent electronic liquid level switch of claim 6, wherein the insulating material is any one of epoxy resin, silica gel and waterproof gel.
8. A method of controlling an intelligent electronic level switch as claimed in any one of claims 1 to 7, comprising the steps of:
(S1) respectively placing an intelligent electronic liquid level switch in air and liquid, and respectively obtaining an admittance value X sensed for the first time and an admittance value Y sensed for the second time;
(S2) the processing module compares the admittance value X with the admittance value Y, wherein the admittance value with a larger value is set as the admittance value L in the liquid, and the admittance value with a smaller value is set as the admittance value A in the air;
(S3) alternately replacing the sensing positions of the intelligent electronic liquid level switch, respectively obtaining admittance values L in the liquid for N times, and calculating an average value L avg From L to L avg The range of values of + -10% is set as the range of admittance values in the liquid; obtaining admittance values A in the air for N times, and calculating an average value A avg， A is avg The numerical range of + -30% is set as the admittance range in air;
(S4) the intelligent electronic liquid level switch works to obtain the sensed admittance value Z, and the processing module enables the admittance values Z and L to work avg The comparison is carried out in a numerical range of +/-10%, if the admittance value Z is located at L avg If the numerical range is +/-10%, the liquid level switch is judged to be positioned in the liquid; if the admittance value Z is not at L avg If the numerical value is +/-10%, skipping to the next step;
(S5) the processing module compares the admittance values Z and A avg The comparison is carried out in a numerical range of +/-30%, and if the admittance value Z is located at A avg If the numerical value is +/-30%, the liquid level switch is judged to be positioned in the air; if the admittance value Z is not in A avg If the numerical value is within +/-30%, jumping to the step (S4).
9. The method of claim 8, wherein in step (S3), N is greater than or equal to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211560506.9A CN115692097A (en) | 2022-12-07 | 2022-12-07 | Intelligent electronic liquid level switch and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211560506.9A CN115692097A (en) | 2022-12-07 | 2022-12-07 | Intelligent electronic liquid level switch and control method thereof |
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| Publication Number | Publication Date |
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| CN115692097A true CN115692097A (en) | 2023-02-03 |
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| CN202211560506.9A Pending CN115692097A (en) | 2022-12-07 | 2022-12-07 | Intelligent electronic liquid level switch and control method thereof |
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| CN (1) | CN115692097A (en) |
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- 2022-12-07 CN CN202211560506.9A patent/CN115692097A/en active Pending
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