CN213253162U - Sludge liquid level detection device and automatic sewage discharge system of sedimentation tank - Google Patents
Sludge liquid level detection device and automatic sewage discharge system of sedimentation tank Download PDFInfo
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- CN213253162U CN213253162U CN202021720083.9U CN202021720083U CN213253162U CN 213253162 U CN213253162 U CN 213253162U CN 202021720083 U CN202021720083 U CN 202021720083U CN 213253162 U CN213253162 U CN 213253162U
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Abstract
The embodiment of the application provides a mud liquid level detection device and automatic sewage system of sedimentation tank, the device includes: the device comprises a transmitter and at least one sensor arranged in the muddy water mixed liquid, wherein the sensor is electrically connected with the transmitter; the sensor comprises a magnetic floater with the same specific gravity as a preset area in the muddy water mixed liquid, a restraint pipe shell for containing the magnetic floater and a non-magnetic pipe fixedly connected with the restraint pipe shell, wherein the restraint pipe shell is provided with a through hole, and an electric sensing part formed by combining a reed switch and a resistor string is arranged in the non-magnetic pipe; the transmitter is used for receiving the resistance change signal sent by the sensor and outputting a sludge liquid level signal; this application can accurately detect the change of mud concentration and mud liquid level, mud thickness, realizes the detection of low-cost mud liquid level and the automatic trigger sedimentation tank blowdown.
Description
Technical Field
The application relates to the field of environmental protection equipment, in particular to a sludge liquid level detection device and an automatic sewage discharge system of a sedimentation tank.
Background
With the continuous development of economy and the continuous improvement of the living standard of residents in China, the problem of water pollution is increasingly serious, and the sewage treatment and regeneration are more and more concerned. In order to improve sewage treatment capacity and reduce operation cost of sewage treatment, sewage treatment plants in various places need to continuously improve the automation degree of sewage treatment equipment and reduce manual operation.
In a sewage treatment plant, a sedimentation tank is an important component of a biochemical sewage treatment system and mainly used for separating mud and water, clarifying and concentrating mixed liquor, refluxing sludge and controlling the concentration of the sludge to keep the stable and reliable operation of the biochemical tank. The working effect of the device directly influences the effluent quality of the sewage treatment system.
Sludge discharge is one of the most important and difficult to control operation steps in the sedimentation tank. The technology adopts two working modes of continuous mud discharging and intermittent mud discharging of a mud discharging pump of a mud sucking and scraping machine. The start and stop of the dredge pump are generally controlled manually or automatically by timing. Manual control can only be operated by experience, and the accuracy is poor. The timing automatic control mode realizes timing pump starting and sludge discharging and timing pump stopping through a time relay or a time control program artificially set in a PLC program, in the past, the modes do not introduce a means for detecting sludge concentration data, the detection of the liquid level and the thickness of a sludge layer is an open-loop control system, and the problems of too low sludge concentration or incomplete necrotic sludge discharge caused by excessive sludge discharging can be caused because the change conditions of the sludge concentration and the liquid level and the thickness of the sludge layer cannot be sensed in time. Above two kinds of circumstances all can cause the not good problem of treatment effect in biochemical pond, need artifical constantly to participate in the adjustment mud discharging volume, increased operating personnel's intensity of labour. The sludge discharge depends too much on the management experience of operators. The accidents of sludge disintegration and floating can not be predicted in advance.
The control mode among the prior art is that the mud level is detected through ultrasonic wave muddy water interface appearance, reaches the sludge level and just controls the mud and discharges when certain height, and the mud that just stops when the muddy water interface reduces to certain height. This control method also has drawbacks. First, the detection of the sludge-water interface does not guarantee the concentration of the sludge after sludge discharge. Secondly, the ultrasonic mud-water interface meter requires that the sensor probe must be vertically installed with the water surface, and if other solids shield the space between the sensor probe of the mud-water interface meter and the pool bottom, interference signals can be caused or correct measurement cannot be realized due to the impact of floating objects in water or the adhesion of suspended matters in water to the surface of the probe. In addition, one reason why the control method cannot be widely popularized is that the ultrasonic mud-water interface instrument with stable performance is expensive and high in maintenance cost.
Therefore, the inventor provides a sludge liquid level detection device and an automatic sewage discharge system of a sedimentation tank by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, this application provides a mud liquid level detection device and automatic blowdown system of sedimentation tank, can accurately detect the change of mud concentration and mud liquid level, mud thickness, realizes the detection of low-cost mud liquid level and the automatic trigger sedimentation tank blowdown.
In order to solve the technical problem, the application provides the following technical scheme:
in a first aspect, the present application provides a sludge liquid level detection device, including: the device comprises a transmitter and at least one sensor arranged in the muddy water mixed liquid, wherein the sensor is electrically connected with the transmitter;
the sensor comprises a magnetic floater with the same specific gravity as a preset area in the muddy water mixed liquid, a restraint pipe shell for containing the magnetic floater and a non-magnetic pipe fixedly connected with the restraint pipe shell, wherein the restraint pipe shell is provided with a through hole, and the non-magnetic pipe is internally provided with an electric sensing component which is formed by combining a reed switch which is triggered through the magnetic action of the magnetic floater when the magnetic floater moves and a resistor string which generates resistance change through the triggering of the reed switch and is used for sending a resistance change signal to the transmitter according to the resistance change of the resistor string;
the transmitter is used for receiving the resistance change signal sent by the sensor and outputting a sludge liquid level signal.
Further, the specific gravity of the magnetic floater is the same as that of the junction of a transition area and a compaction area in the muddy water mixed liquid, wherein the transition area and the compaction area are determined according to a preset sludge solid flux analysis method.
Further, the specific gravity of the magnetic floater is the same as that of the lower part of a compaction area in the muddy water mixed liquid, wherein the compaction area is determined according to a preset sludge solid flux analysis method.
Furthermore, the restraint pipe shell is a round pipe with an upper seal and a lower seal, and the upper end and the lower end of the restraint pipe shell are screwed with detachable movable parts.
Further, the through hole is a rectangular through hole, and the width of the rectangular through hole is smaller than the outer diameter of the magnetic floater.
Further, a vibrator for performing vibration work according to a set frequency and a set period is arranged on the restraint tube shell.
Further, the non-magnetic pipe is made of waterproof materials.
Further, the output end of the resistor string is provided with a shielding layer.
Further, the transmitter comprises an unbalanced bridge, and the unbalanced bridge is connected with one lead led out from one end of the resistor string and two leads led out from the other end of the resistor string.
Further, the power supply of the unbalanced bridge is a regulated power supply.
Furthermore, the transmitter further comprises an amplifier, a digital-to-analog conversion interface and a single chip microcomputer, wherein the unbalanced bridge is in signal connection with the amplifier, the amplifier is in signal connection with the digital-to-analog conversion interface, and the digital-to-analog conversion interface is in signal connection with the single chip microcomputer.
In a second aspect, the application provides an automatic sewage discharging system of a sedimentation tank, including setting up mud scraper and foretell mud liquid level detection device in the sedimentation tank, mud liquid level detection device with mud scraper signal connection, mud scraper includes the basis mud pump that mud liquid level signal that mud liquid level detection device sent carries out blowdown work.
Further, the sensor of the sludge liquid level detection device is arranged at the bottom of the sedimentation tank, and the transmitter of the sludge liquid level detection device is arranged on the protective railing at the edge of the sedimentation tank.
Furthermore, a sensor of the sludge liquid level detection device is arranged on a bottom equipment support of the mud scraper, and a transmitter of the sludge liquid level detection device is arranged on an upper working bridge of the mud scraper.
According to the technical scheme, the application provides a mud liquid level detection device and automatic sewage disposal system of sedimentation tank, through set up at least one sensor in the muddy water mixed liquid at the sedimentation tank, and then the position change of the magnetic float through the sensor produces the resistance change of the resistance string that corresponds, with this to a resistance change signal of changer output, and then by a mud liquid level signal that the changer output corresponds, thereby realize accurate row mud, under the condition of mud is arranged to the high efficiency, make the operating time of inhaling the mud pump more reasonable, play energy-conserving effect, reduce the operating cost of sewage plant.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the sludge distribution state of a sedimentation tank in a stable operation state in the embodiment of the present application;
FIG. 2 is a graph showing the relationship between the depth of a sedimentation tank and the concentration of sludge in the embodiment of the present application;
FIG. 3 is a schematic structural view of the magnetic float according to the embodiment of the present application;
fig. 4 is a schematic structural view of the constraining vessel in the embodiment of the present application;
FIG. 5 is a schematic structural diagram of a sensor according to an embodiment of the present application;
FIG. 6 is a schematic diagram of the electrical circuit of the transmitter of the embodiment of the present application;
fig. 7 is a schematic structural diagram of an automatic blowdown system of a settling tank in an embodiment of the present application.
[ description of symbols ]
100 is a mud-water interface;
101 is a clarification zone;
102 is a uniform precipitation zone;
103 is a transition zone;
104 is a compaction zone;
105 is a water inlet weir;
106 is an effluent weir;
107 is a concentration linear change area;
h1 is the sludge limit liquid level height of the compaction area;
h2 is the average concentration liquid level height of the sludge in the compaction area;
h3 is the liquid level height of the upper surface of the sludge in the compaction area;
h4 is the liquid level height of the upper surface of the sludge in the transition zone;
h5 is the height of the mud-water interface;
h6 is the liquid level height of the clarification zone;
c1 represents the concentration of the mud-water mixed solution 1;
c2 is the concentration of the mud-water mixed solution 2;
c3 is the concentration of the mud-water mixed solution 3;
c4 is the concentration of the mud-water mixed solution 4;
c5 represents the concentration of the mud-water mixed solution 5;
c6 is the concentration of the mud-water mixed solution 6;
c7 is the concentration of the mud-water mixed solution 7;
300 is a magnetic floater;
301 is a flexible protective cap;
302 is a permanent magnetic ring;
303 is a cavity;
304 is a counterweight;
401 is a constraining vessel;
402 is a removable top cover for the constraining vessel;
403 is a through hole for restricting the side wall of the tube shell;
404 is a two-way slot with symmetrical pipe diameter;
405 is a flexible pad;
406 is a removable bottom cover for the constraining vessel;
407 is a vibrator;
407.1 is vibrator 1;
407.2 is vibrator 2;
501 is a sensor;
501.1 is sensor 1;
501.2 is sensor 2;
502 leading out a watertight connector for a sensor cable;
503 is a sensor lead-out;
504 is a reed switch;
505 is a resistor string;
506 is sealing filler;
507 is a sensor lead outlet pipe;
508 is a non-magnetic pipe
601 is a transmitter;
602 is a single chip microcomputer;
603 is a digital-to-analog conversion interface;
604.1 is a vibration driving circuit 1;
604.2 is a vibration driving circuit 2;
605 is an amplifier;
k is the amplification factor of the amplifying circuit;
606 is liquid level 1;
607 is level 2;
608 is the liquid level difference;
609 is a 4-20 mA DC signal output;
r1, R2 and R3 are fixed bridge arm resistors of the unbalanced bridge;
r is the lead-out line resistance of the sensor;
701 is the upper working bridge of the mud scraper.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
First, according to the sludge solid flux analysis method in the prior art, when the sedimentation tank is continuously and stably operated, as shown in fig. 1, the sludge-water mixed liquid in the sedimentation tank can be divided into four regions: a clarification zone 101, a uniform settling zone 102, a non-uniform settling transition zone 103, and a sludge compaction zone 104, wherein the depth of sludge in the settling tank versus concentration curve can be as shown in fig. 2.
Specifically, the appearance of the clarification zone 101 and the uniform settling zone 102 in fig. 1 is a result of the sludge colloidal particles co-sinking at the same speed due to the inter-particle interaction generated by brownian motion of the sludge colloidal particles suspended above the sludge mixed liquor. The function relationship between the settling distance and the concentration of the sludge concentration in the two areas is a straight line with constant slope, which is called a uniform settling stage, and is a line segment between 1 and 2 shown in figure 2. The sludge-water mixed liquid in the two areas has a clear water area 101 at the upper layer and a sludge uniform sedimentation area 102 at the lower layer along with the increase of the sludge sedimentation time, and a clear sludge-water interface 100 is presented between the two areas.
The lower layer of the sludge uniform settling zone 102 is a transition zone 103 with the sludge concentration varying, such as 2-3 of fig. 2. In this region, the concentration of the sludge particles which are settled uniformly in the uniform settling zone 102 increases gradually as the settling distance increases, the gravity applied to the sludge particles is greater than the interaction force between the colloidal particles, the sludge particles perform the squeezing and dewatering action on the sludge under the action of the gravity, so that the sludge is converted from uniform settling to deceleration settling, and a critical point 2 as shown in fig. 2 appears. From the critical point 2, the sedimentation process enters the sedimentation velocity transition zone 103, the sludge concentration is in a gradually increasing gradient distribution trend, and the sludge concentration and the sedimentation distance are in a curve with gradually decreasing change rate.
Meanwhile, the lowest layer of the mud-water mixed liquid is a compaction area 104, and due to the fact that the distance between sludge particles is continuously reduced, the repulsive force and the gravity between sludge molecules are gradually close to equal, as shown between 3 and 7 of the figure 2. The sludge concentration enters a gradually-decelerating settling process after accelerated settling, the settling speed of the bottommost layer becomes extremely slow, moisture in the sludge is continuously extruded out, and the function relation between the downward distance of the sludge and the sludge concentration in the compaction area 104 is a curve with a small slope and a gradually-decreasing slope.
According to the above, the change relationship between the sludge concentration and the sludge depth can provide a theoretical basis and necessary conditions for the feasibility of the application.
In order to be able to accurately detect the change of sludge concentration, sludge liquid level and sludge thickness, the application provides an embodiment of a sludge liquid level detection device, refer to fig. 3 to 5, in this embodiment, the sludge liquid level detection device specifically includes: the device comprises a transmitter 601 and at least one sensor 501 arranged in the muddy water mixed liquid, wherein the sensor 501 is electrically connected with the transmitter 601.
The sensor 501 comprises a magnetic floater 300 with the same specific gravity as that of a preset area in the muddy water mixed liquid, a restraint pipe shell 401 for accommodating the magnetic floater 300 and a non-magnetic pipe 508 fixedly connected with the restraint pipe shell 401, wherein a through hole 403 is formed in the restraint pipe shell 401, and an electric sensing component which is formed by combining a reed pipe magnetic control switch 504 triggered by the magnetic action of the magnetic floater 300 when the magnetic floater 300 moves and a resistor string 505 which generates resistance change by triggering of the reed pipe magnetic control switch 504 and is used for sending a resistance change signal to the transmitter 601 according to the resistance change of the resistor string 505 is arranged in the non-magnetic pipe 508;
the transmitter 601 is configured to receive the resistance change signal sent by the sensor 501 and output a sludge level signal.
From the above description, according to the mud liquid level detection device that this application embodiment provided, through predetermineeing regional at least one sensor 501 that sets up in the muddy water mixed liquid of sedimentation tank, and then the position change of the magnetic float 300 through sensor 501 produces the resistance change of corresponding resistance string 505, with this to a resistance change signal of changer 601 output, and then export a corresponding mud liquid level signal by changer 601, thereby realize accurate row mud, under the condition of high-efficient row mud, make the operating time of suction mud pump more reasonable, play energy-conserving effect, reduce the operating cost of sewage plant.
As a preferred embodiment, the specific gravity of the magnetic floater 300 is the same as that of a preset region "the junction between the transition region 103 and the compaction region 104" in the sludge-water mixed liquid, wherein the transition region 103 and the compaction region 104 are determined according to a preset sludge solid flux analysis method.
Optionally, according to the distribution of the sludge in the sedimentation tank in the compaction area 104 and the depth interval, the specific gravity of the sludge is continuously increased along with the increase of the depth, according to the relation that the sludge concentration is in direct proportion to the specific gravity, as long as a float with the same specific gravity as a certain layer of sludge in the compaction area is thrown into the sludge medium, according to the law of archimedes buoyancy, the specific gravity float can be suspended in the sludge layer with the same specific gravity, and as long as the height of the specific gravity float from the tank bottom can be measured, the liquid level of the sludge with the concentration can be measured.
As a preferred embodiment, the specific gravity of the magnetic floater 300 is the same as that of a preset region "lower part of the compacting zone 104" in the muddy water mixed liquid, wherein the compacting zone 104 is determined according to a preset sludge solid flux analysis method.
Alternatively, in another embodiment of the present application, since the above state is an ideal condition, when the water inflow and the sludge discharge are changed, since the sludge concentration is constantly changed, it is difficult to accurately judge the actual distribution of the sludge concentration in the compacting zone 104 by a specific gravity float. In order to solve the problem, two floaters with different specific gravities, namely a floater I with the same specific gravity as the sludge at the 4 th point and a floater II with the same specific gravity as the sludge at the 6 th point in the figure 2 are thrown into the compaction area 104, and the floaters with different specific gravities can be suspended in sludge layers with different specific gravities, so that the change interval of the sludge concentration in a certain depth range can be measured. The specific gravity of the floater I is selected to be the same as the specific gravity of the sludge in the upper layer of the compaction area 104; the specific gravity of the floater II is selected to be the same as the specific gravity of the sludge concentration in the lower layer area of the compaction area 104. The interference of water inflow and sludge discharge on the floater I is increased, and the vertical floating range is larger; the floater II is positioned at the lower part of the compaction layer, and the change of the sludge concentration is small due to small interference of external disturbance, so that the floater II can be used as the bottom reference of the sludge thickness of the compaction layer. And the actual sludge quantity of the compaction area 104 of the sedimentation tank can be obtained by processing the measured value of the distance between the floater I and the floater II. When the row of mud, through the control mud discharge amount that the interval of controlling two floaters just can be fine, guarantee simultaneously that mud concentration is unlikely to hang down excessively or the not enough problem of row mud appears behind the row mud.
As a preferred embodiment, the constraining tube case 401 is a circular tube with upper and lower seals, the upper and lower ends of the constraining tube case 401 are screwed with detachable movable components, the through hole 403 is a rectangular through hole, and the width of the rectangular through hole is smaller than the outer diameter of the magnetic floater 300.
Optionally, referring to fig. 4, the inner diameter of the constraining tube shell 401 can ensure that the magnetic float 300 can move freely up and down in the tube, and the inner diameter can limit the magnetic float 300 not to swing left and right in the horizontal direction. The upper and lower removable end caps 402 and 406, when removed, facilitate installation and replacement of the float, and, on the other hand, facilitate cleaning of the confinement housing 401. The rectangular through hole 403 in the side wall of the restraint pipe shell 401 can enable the restraint pipe shell 401 to be communicated with a sludge medium, so that sludge in the pipe is fully exchanged with sludge in a sludge pool local measurement area, the concentration of the sludge in the pipe is consistent with that of the sludge outside, and the measurement accuracy is guaranteed.
In a preferred embodiment, the constraining vessel 401 is provided with a vibrator 407 for vibrating operation according to a set frequency and a set period.
Optionally, referring to fig. 4, a vibrator 407 may be disposed in the middle of the constraining tube shell 401, and the vibrator 407 vibrates once at intervals, so as to prevent the magnetic float 300 from being stuck by other hard foreign matters to affect measurement; the vibrator 407 can also remove foreign matters attached to the inner wall of the constraining vessel 401 and the surface of the magnetic floater 300 by vibration, ensuring that the magnetic floater 300 moves up and down freely in the vessel.
In a preferred embodiment, the non-magnetic tube 508 is made of waterproof material.
Optionally, referring to fig. 5, a non-magnetic pipe 508 made of a waterproof material is sealed in a waterproof manner and then fixed in parallel with the constraining pipe shell 401, and the working principle is that the magnetic floater 300 in the constraining pipe shell 401 rises and falls along with the change of the concentration of the medium, the magnetism of the magnetic floater 300 attracts the reed pipe magnetic control switch 504 at a corresponding position in the non-magnetic pipe 508, so that the total resistance of the resistor string 505 changes correspondingly, and then the change of the resistance (or voltage) is converted into a 4-20 mA standard direct current signal through the transmitter 601 to be output. The accuracy of a sensing component formed by connecting the reed switch magnetic control switch group 504 and the resistor string 505 in parallel can reach +/-5 mm.
In a preferred embodiment, the output end of the resistor string 505 is provided with a shielding layer, and the transmitter 601 includes an unbalanced bridge, which is connected with one conducting wire led out from one end of the resistor string 505 and two conducting wires led out from the other end of the resistor string 505.
Alternatively, the transmitter 601 is configured as shown in fig. 6, an input portion of the transmitter measures a resistance change of the sensor by using an unbalanced bridge, an output end of a resistor string of the sensor 501 is led out by using a three-wire system with a shielding layer, one end of the resistor string 505 leads out a wire, the other end leads out two wires, and the resistor string 505 is connected to the unbalanced bridge by three wires and serves as one bridge arm of the unbalanced bridge. The three-wire wiring method can eliminate the influence on the measurement accuracy due to the change of the line resistance r.
As a preferred embodiment, the power supply of the unbalanced bridge is a regulated power supply, the transmitter 601 further includes an amplifier 605, a digital-to-analog conversion interface 603, and a single chip microcomputer 602, the unbalanced bridge is in signal connection with the amplifier 605, the amplifier 605 is in signal connection with the digital-to-analog conversion interface 603, and the digital-to-analog conversion interface 603 is in signal connection with the single chip microcomputer 602.
Optionally, referring to fig. 6, the power supply of the unbalanced bridge uses a DC5V regulated power supply, the signal Ux at the output end of the bridge is connected to an amplifier 605 with infinite input impedance, the output signal of the amplifier is converted into a digital signal through a digital-to-analog (D/a) conversion interface 603, and then the digital signal is operated by a single chip 602 to obtain the liquid level of the magnetic floater 300.
Specifically, the operating principle of the unbalanced bridge at the input end of the transmitter 601 may be as follows:
the resistances of four bridge arms of the unbalanced bridge are R respectively1、R2、R3、RxWherein R is1、R2、R3Rx is the resistor string resistance of the sensor 501, which is a known resistor. The output voltage of the unbalanced bridge is Ux, the supply voltage of the bridge is Us, and the relation equation between Ux and Rx is:
the resistance Rx of the resistor string can be calculated by measuring the value of Ux, and Rx is proportional to the depth of the magnetic float 300, so that the depth H to the magnetic float 300 can be calculated.
In some embodiments of the present application, two sensors 501 with different densities may be provided, so that the levels H of two different concentrations of sludge can be measured1And H2Is prepared from H1And H2The thickness of the sludge layers in two different density ranges can be obtained by subtracting, and reliable guarantee is provided for controlling the discharged sludge amount.
In order to be able to accurately detect the change of sludge concentration and sludge liquid level, mud thickness to carry out blowdown work automatically, the application provides an embodiment of mud liquid level detection device, see fig. 7, in this embodiment, automatic blowdown system of sedimentation tank, including setting up the mud scraper and foretell mud liquid level detection device in the sedimentation tank, mud liquid level detection device with mud scraper signal connection, the mud scraper includes the basis mud suction pump that mud liquid level signal that mud liquid level detection device sent carries out blowdown work.
As a preferred embodiment, the sensor 501 of the sludge level detection device is arranged at the bottom of the sedimentation tank, and the transmitter 601 of the sludge level detection device is arranged on a guard rail at the edge of the sedimentation tank.
As another preferred embodiment, the sensor 501 of the sludge level detection device is arranged on the bottom equipment support of the mud scraper, and the transmitter 601 of the sludge level detection device is arranged on the upper working bridge 701 of the mud scraper.
Alternatively, the sensor 501 may be completely immersed in the compacting zone 104, and the zero scale line of the magnetic float 300 below the sensor may be positioned with respect to the bottom of the sedimentation basin when installed as a reference for measuring the mud level. At the beginning of the sewage injection in the sedimentation tank, because the sewage is not fully settled and the concentration is lower, the two floaters are both settled at the zero position. When the sewage is filled in the sedimentation tank and is settled for a period of time, the floater I can float firstly, and the floater II also begins to float along with the gradual increase of the sludge concentration. When the suspension heights of the two floats reach the set corresponding heights respectively, the concentration and the quantity of the sludge are indicated to reach the state of sludge discharge, and then a sludge suction pump of the sludge scraper is started to work to discharge the sludge. Along with the discharge of the high-concentration sludge at the lower part, the concentration of the sludge is gradually reduced under the influence of inlet water, and when the height difference of the two floats is reduced to a value required by the process, the sludge discharge is stopped.
It can be understood that, this application check out test set component is simple, and the principle is clear, and it is easy to make, has the price advantage, can be applied to newly-built sludge impoundment and the transformation engineering in original sludge impoundment on a large scale. Because can accurate row mud, can make the operating time of mud suction pump more reasonable under the condition of high-efficient row mud, play energy-conserving effect, reduce the operation cost of sewage factory.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (14)
1. The utility model provides a mud liquid level detection device which characterized in that includes: the device comprises a transmitter and at least one sensor arranged in the muddy water mixed liquid, wherein the sensor is electrically connected with the transmitter;
the sensor comprises a magnetic floater with the same specific gravity as a preset area in the muddy water mixed liquid, a restraint pipe shell for containing the magnetic floater and a non-magnetic pipe fixedly connected with the restraint pipe shell, wherein the restraint pipe shell is provided with a through hole, and the non-magnetic pipe is internally provided with an electric sensing component which is formed by combining a reed switch which is triggered through the magnetic action of the magnetic floater when the magnetic floater moves and a resistor string which generates resistance change through the triggering of the reed switch and is used for sending a resistance change signal to the transmitter according to the resistance change of the resistor string;
the transmitter is used for receiving the resistance change signal sent by the sensor and outputting a sludge liquid level signal.
2. The sludge level detecting device according to claim 1, wherein the specific gravity of the magnetic float is the same as the specific gravity of the interface between a transition region and a compaction region of the sludge-water mixed liquid, wherein the transition region and the compaction region are determined according to a preset sludge solid flux analysis method.
3. The sludge level detecting apparatus according to claim 1, wherein the magnetic float has a specific gravity equal to that of a lower portion of a compacted region in the sludge-water mixed liquid, wherein the compacted region is determined according to a predetermined sludge solid flux analysis method.
4. The sludge liquid level detecting device as claimed in claim 1, wherein the constraining pipe shell is a round pipe with upper and lower seals, and the upper and lower ends of the constraining pipe shell are screwed with detachable movable parts.
5. The sludge level detecting device according to claim 1, wherein the through hole is a rectangular through hole, and the width of the rectangular through hole is smaller than the outer diameter of the magnetic float.
6. The sludge level detecting device according to claim 1, wherein the constraining pipe casing is provided with a vibrator for vibrating according to a set frequency and a set period.
7. The sludge liquid level detecting device according to claim 1, wherein the non-magnetic pipe is made of a waterproof material.
8. The sludge level detecting device as claimed in claim 1, wherein the output end of the resistor string is provided with a shielding layer.
9. The sludge level detecting device of claim 1, wherein the transmitter comprises an unbalanced bridge, and the unbalanced bridge is connected with one lead wire led out from one end of the resistor string and two lead wires led out from the other end of the resistor string.
10. The sludge level detecting device of claim 9, wherein the power source of the unbalanced bridge is a regulated power supply.
11. The sludge liquid level detecting device according to claim 9, wherein the transmitter further comprises an amplifier, a digital-to-analog conversion interface and a single chip microcomputer, the unbalanced bridge is in signal connection with the amplifier, the amplifier is in signal connection with the digital-to-analog conversion interface, and the digital-to-analog conversion interface is in signal connection with the single chip microcomputer.
12. An automatic sewage disposal system for a sedimentation tank, comprising a sludge scraper arranged in the sedimentation tank and a sludge liquid level detection device according to any one of claims 1 to 11, wherein the sludge liquid level detection device is in signal connection with the sludge scraper, and the sludge scraper comprises a sludge suction pump for performing sewage disposal work according to a sludge liquid level signal sent by the sludge liquid level detection device.
13. The automatic blowdown system of claim 12, wherein the sensor of the sludge level detection device is disposed at the bottom of the sedimentation tank, and the transmitter of the sludge level detection device is disposed on a guard rail at the edge of the sedimentation tank.
14. The automatic blowdown system of claim 12, wherein the sensor of the sludge level detection device is disposed on a bottom equipment bracket of the mud scraper, and the transmitter of the sludge level detection device is disposed on an upper working bridge of the mud scraper.
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| CN202021720083.9U CN213253162U (en) | 2020-08-18 | 2020-08-18 | Sludge liquid level detection device and automatic sewage discharge system of sedimentation tank |
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| CN202021720083.9U CN213253162U (en) | 2020-08-18 | 2020-08-18 | Sludge liquid level detection device and automatic sewage discharge system of sedimentation tank |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114415570A (en) * | 2022-01-20 | 2022-04-29 | 广东奥哈奇智能科技有限公司 | Interface controller for sludge in secondary sedimentation tank |
| CN115518452A (en) * | 2022-10-29 | 2022-12-27 | 安徽省金寨县水电建设有限责任公司 | Automatic water starting and stopping device applied to filtering of filter tank |
| US11788988B1 (en) * | 2022-05-26 | 2023-10-17 | Zhejiang University | System and method for measuring sludge moisture content by ultrasound |
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2020
- 2020-08-18 CN CN202021720083.9U patent/CN213253162U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114415570A (en) * | 2022-01-20 | 2022-04-29 | 广东奥哈奇智能科技有限公司 | Interface controller for sludge in secondary sedimentation tank |
| US11788988B1 (en) * | 2022-05-26 | 2023-10-17 | Zhejiang University | System and method for measuring sludge moisture content by ultrasound |
| CN115518452A (en) * | 2022-10-29 | 2022-12-27 | 安徽省金寨县水电建设有限责任公司 | Automatic water starting and stopping device applied to filtering of filter tank |
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