阅读说明：本技术 液位检测与控制系统 (Liquid level detection and control system ) 是由 郭凯敏 张元博 于 2020-12-29 设计创作，主要内容包括：一种液位检测与控制系统用于检测和控制容器内液体的高度,包括：进液模组,用以向容器输入液体；液位检测模组,用以检测液体高度,包括对应不同高度区间的至少两个液位检测单元,每一液位检测单元包括：浮动子单元,设置于容器内,可在预设活动区间内随液体高度沿竖直方向改变位置；位移子单元,设置于容器的上方,与浮动子单元连接,可跟随浮动子单元的竖直方向位置改变对应预设支点转动；感测单元,设置于临近位移子单元的至少二个预设位置,用以感测位移子单元的移动范围来产生检测结果；和控制模组,用以接收液位检测模组的检测结果,并根据检测结果控制进液模组的进液参数。(A liquid level sensing and control system for sensing and controlling the level of liquid in a container, comprising: the liquid inlet module is used for inputting liquid into the container; the liquid level detection module is used for detecting the height of liquid, and comprises at least two liquid level detection units which correspond to different height intervals, wherein each liquid level detection unit comprises: the floating sub-unit is arranged in the container and can change the position along the vertical direction along with the height of the liquid in a preset moving interval; the displacement subunit is arranged above the container, is connected with the floating subunit and can rotate along with the vertical direction position change of the floating subunit corresponding to the preset fulcrum; the sensing units are arranged at least two preset positions close to the displacement subunits and used for sensing the moving range of the displacement subunits to generate detection results; and the control module is used for receiving the detection result of the liquid level detection module and controlling the liquid inlet parameter of the liquid inlet module according to the detection result.)

1. A liquid level sensing and control system for sensing and controlling the level of liquid in a container, comprising:

the liquid inlet module is used for inputting liquid into the container;

the liquid level detection module is used for detecting the height of liquid, and comprises at least two liquid level detection units which correspond to different height intervals, wherein each liquid level detection unit comprises:

the floating sub-unit is arranged in the container and can change the position along the vertical direction along with the height of the liquid in a preset moving interval;

the displacement subunit is arranged above the container, is connected with the floating subunit and can rotate along with the vertical direction position change of the floating subunit corresponding to the preset fulcrum;

the sensing units are arranged at least two preset positions close to the displacement subunits and used for sensing the moving range of the displacement subunits to generate detection results; and

and the control module is used for receiving the detection result of the liquid level detection module and controlling the liquid inlet parameter of the liquid inlet module according to the detection result.

2. The liquid level detection and control system of claim 1, wherein the liquid level detection module comprises two liquid level detection units, the two liquid level detection units respectively comprise a first float subunit and a second float subunit, the first float subunit can detect the change of the liquid between a first high liquid level and a first low liquid level, the second float subunit can detect the change of the liquid between a second high liquid level and a second low liquid level, and the second low liquid level is higher than the first high liquid level.

3. The liquid level detecting and controlling system according to claim 2, wherein the sensing units of the liquid level detecting unit are provided with sensors corresponding to the first high liquid level, the first low liquid level, the second high liquid level and the second low liquid level, respectively.

4. The fluid level detection and control system of claim 3, wherein the control module sends a feed signal to the feed module upon sensing that the fluid level is below a first low fluid level, the feed signal comprising one or more of a feed rate, a total fluid level, or a fluid type.

5. The system of claim 4, wherein the control module sends a feed liquid deceleration signal to the feed liquid module to slow the feed liquid speed when sensing that the liquid level is higher than a second low level, and sends a stop signal to the feed liquid module to stop feeding liquid when sensing that the liquid level reaches a second high level.

6. The fluid level detection and control system of claim 1, further comprising:

the temperature control module is used for sensing and adjusting the temperature of the liquid in the container;

the control module is also used for controlling the temperature control parameters of the temperature control module according to the detection result of the liquid level detection module.

7. The system of claim 6, wherein the control module sends a temperature increase signal to the temperature control module to increase the temperature of the liquid when receiving the liquid level increase signal.

8. The system of claim 6, wherein the control module sends a temperature stop signal to the temperature control module to stop heating when receiving a signal that the liquid level is lower than a first predetermined level.

9. The fluid level detection and control system of claim 6, wherein the control module sends a temperature raising signal to the temperature control module for raising the temperature of the fluid when receiving a signal that the fluid level is above a second predetermined level.

10. The fluid level detection and control system of claim 1, wherein the sensing unit is a non-contact sensor and the fluid is a mixture comprising an oil or a solid.

11. The fluid level detection and control system of claim 1, wherein the fluid level detection module further comprises a bracket coupled to an upper end of the container, the float subunit movably coupled to the bracket, the displacement subunit rotatably coupled to the bracket, and the sensing unit secured to the bracket.

12. The system for detecting and controlling liquid level according to claim 11, wherein the float subunit comprises a float ball and a first connecting rod fixedly connected to the float ball, and the first connecting rod moves up and down on the bracket along with the float ball.

13. The fluid level sensing and control system of claim 12, wherein the bracket includes a base plate having a guide hole formed therein, the first link being movably disposed in the guide hole.

14. The fluid level detection and control system of claim 12, wherein the displacement sub-unit comprises a second link, the second link comprising a first end, a second end, and a connecting portion between the first end and the second end, the first end being rotatably connected to the first link, the connecting portion being rotatably connected to the bracket, the sensing unit sensing movement of the second end.

15. The system of claim 14, wherein the sensor unit comprises two sensors, each sensor has a position-limiting element fixed thereon, the second end of the sensor abuts against one position-limiting element when the second end rotates to the first sensor, and the second end of the sensor abuts against the other position-limiting element when the second end rotates to the second sensor.

16. The fluid level sensing and control system of claim 14, wherein the connecting portion defines a through hole, the bracket defines a receiving slot and a positioning hole communicating with the receiving slot, a central axis of the receiving slot is perpendicular to a central axis of the positioning hole, the second link is inserted into the receiving slot, a fixed shaft is inserted through the positioning hole and disposed in the through hole, and the second link rotates around the fixed shaft.

Technical Field

The application relates to the technical field of liquid level detection, in particular to a liquid level detection and control system.

Background

In order to monitor the liquid level in liquid containers such as a water tank, a float switch is generally placed in the liquid container, the water level of the water tank is monitored by the traditional float switch in an immersion fixed-point monitoring mode, a floating ball of the float switch moves up and down when pushed by the buoyancy of a liquid medium, and a magnet on the floating ball triggers a magnet switch on a control rod of the float switch to generate a signal, so that the water level monitoring is realized. Because the traditional floating ball switch is immersed in liquid, when heavy oil is polluted in the liquid, iron impurities in the liquid can interfere the magnet switch, the accuracy of water level monitoring is reduced, and the supply or discharge of the liquid is influenced.

Disclosure of Invention

Accordingly, there is a need for a liquid level detecting and controlling system that improves the accuracy of liquid level monitoring.

A liquid level sensing and control system for sensing and controlling the level of liquid in a container, comprising:

the liquid inlet module is used for inputting liquid into the container;

the liquid level detection module is used for detecting the height of liquid, and comprises at least two liquid level detection units which correspond to different height intervals, wherein each liquid level detection unit comprises:

the floating sub-unit is arranged in the container and can change the position along the vertical direction along with the height of the liquid in a preset moving interval;

the displacement subunit is arranged above the container, is connected with the floating subunit and can rotate along with the vertical direction position change of the floating subunit corresponding to the preset fulcrum;

the sensing units are arranged at least two preset positions close to the displacement subunits and used for sensing the moving range of the displacement subunits to generate detection results; and

and the control module is used for receiving the detection result of the liquid level detection module and controlling the liquid inlet parameter of the liquid inlet module according to the detection result.

Further, the liquid level detection module includes two liquid level detection units, and two liquid level detection units include first sub-unit and the second that floats respectively, and the change of first sub-unit detectable liquid that floats between first high liquid level and first low liquid level, the change of sub-unit detectable liquid that floats between second high liquid level and the second low liquid level of second, and the second is low the liquid level and is higher than first high liquid level.

Further, the sensing unit of the liquid level detection unit is provided with sensors corresponding to the first high liquid level, the first low liquid level, the second high liquid level and the second low liquid level respectively.

Further, the control module group sends the feed liquor signal to the liquid inlet module group when sensing that the liquid position is lower than first low liquid level, and the feed liquor signal includes one or more in feed liquor speed, total liquid volume or the liquid type.

Further, the control module sends feed liquor deceleration signal to the feed liquor module when sensing that the liquid position is higher than the low liquid level of second for slow down the feed liquor speed, when sensing that the liquid position reaches the high liquid level of second, send stop signal to the feed liquor module, be used for stopping the feed liquor.

Further, the liquid level detection and control system further comprises:

the temperature control module is used for sensing and adjusting the temperature of the liquid in the container;

the control module is also used for controlling the temperature control parameters of the temperature control module according to the detection result of the liquid level detection module.

Further, when the control module receives the liquid position rising signal, the control module sends a temperature rising signal to the temperature control module so as to rise the liquid temperature.

Further, the control module sends a temperature-rise stopping signal to the temperature control module when receiving a signal that the liquid position is lower than a first preset liquid level, so as to stop heating.

Further, the control module sends a temperature rise signal to the temperature control module when receiving a signal that the liquid position is higher than a second preset liquid level, so as to raise the liquid temperature.

Further, the sensing unit is a non-contact sensor and the liquid is a mixture comprising oil or solids.

Further, the liquid level detection module further comprises a support, the support is connected with the upper end of the container, the floating subunit is movably connected onto the support, the displacement subunit is rotatably connected onto the support, and the sensing unit is fixed onto the support.

Furthermore, the floating sub-unit comprises a floating ball and a first connecting rod fixedly connected with the floating ball, and the first connecting rod moves up and down on the support along with the floating of the floating ball.

Further, the support comprises a base plate, a guide hole is formed in the base plate, and the first connecting rod is movably arranged in the guide hole.

Further, the displacement subunit includes a second connecting rod, the second connecting rod includes a first end, a second end, and a connecting portion located between the first end and the second end, the first end is rotatably connected to the first connecting rod, the connecting portion is rotatably connected to the bracket, and the sensing unit senses movement of the second end.

Furthermore, the sensing unit includes two sensors, each sensor is fixed with a limiting member, the second end abuts against one limiting member when rotating to one sensor, and abuts against the other limiting member when rotating to the other sensor.

Furthermore, the connecting portion forms a through hole, the bracket forms an accommodating groove and a positioning hole communicated with the accommodating groove, a central axis of the accommodating groove is perpendicular to a central axis of the positioning hole, the second connecting rod penetrates through the accommodating groove, a fixing shaft penetrates through the positioning hole and is arranged in the through hole, and the second connecting rod rotates around the fixing shaft.

The displacement subunit that is connected with the subunit that floats among the above-mentioned liquid level detection and the control system is located the top of container, does not receive the influence of the impurity in the liquid, and the displacement subunit's that the sensing unit sensing was arrived removal can accurately the liquid level in the reaction vessel, has improved the rate of accuracy of liquid level monitoring, and then makes the control module group accurately control the supply or the emission of liquid according to the liquid level.

Drawings

FIG. 1 is a schematic diagram of a liquid level detecting and controlling system according to the present disclosure.

FIG. 2 is a perspective view of the fluid level detection module of FIG. 1 in one embodiment.

FIG. 3 is a perspective view of the liquid level detection module of FIG. 2 in another direction.

FIG. 4 is an exploded view of the fluid level detection module of FIG. 1.

FIG. 5 is a schematic diagram of a liquid level detection and control system according to another embodiment of the present disclosure.

Description of the main elements

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

So that the manner in which the above recited objects, features and advantages of embodiments of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the invention, and the described embodiments are merely a subset of embodiments of the invention, rather than a complete embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention.

Referring to FIG. 1, a liquid level sensing and control system 100 for sensing and controlling the level of liquid in a container is provided. The liquid level detecting and controlling system 100 includes a liquid inlet module 10, a liquid level detecting module 20 and a controlling module 30. The inlet module 10 is used to input liquid into a container, and the liquid may be a mixture containing oil or solid, such as a cleaning liquid for cleaning a workpiece. The liquid level detecting module 20 is used for detecting the liquid level in the container. The control module 30 with feed liquor module 10 and liquid level detection module 20 communication connection for receive liquid level detection module 20's testing result, and according to the feed liquor parameter of testing result control feed liquor module 10.

Referring to fig. 2 to 4, in one embodiment, the liquid level detecting module 20 includes a bracket 21 and at least two liquid level detecting units 22 corresponding to different height sections. The bracket 21 is adapted to be connected to the upper end of the container. The liquid level detection unit 22 is connected to the bracket 21. Each liquid level detection unit 22 includes a floating sub-unit 221, a displacement sub-unit 222 connected to the floating sub-unit 221, and a sensing unit 223. The float sub-unit 221 is disposed in the container and can change its position along with the height of the liquid in a predetermined moving range. The displacement sub-unit 222 is disposed above the container, is connected to the floating sub-unit 221, and can rotate along with the vertical position change of the floating sub-unit 221 corresponding to a preset pivot. The sensing units 223 are disposed at least two predetermined positions adjacent to the displacement subunit 222, and are used for sensing the moving range of the displacement subunit 222 to generate the detection result for the control module 30 to use.

Specifically, the bracket 21 includes a substrate 211 and a fixing plate 212 vertically fixed on the substrate 211. The base plate 211 forms guide holes 2111. The fixing plate 212 includes a first plate 2121 fixed to the base plate 211 and a plurality of second plates 2122 detachably coupled to the first plate 2121. The first plate 2121 forms a plurality of indentations 2123, and the second plate 2122 detachably receives the plurality of indentations 2123. The second plate 2122 is formed with a receiving groove 2124 and a positioning hole 2125 communicating with the receiving groove 2124. The positioning hole 2125 extends from one side of the second plate 2122 to the accommodating groove 2124, and a central axis thereof is perpendicular to a central axis of the accommodating groove 2124.

The floating sub-unit 221 includes a floating ball 2211 and a first link 2212 fixedly connected to the floating ball 2211. The first link 2212 is movably disposed in the guide hole 2111, and moves up and down on the bracket 21 along the guide hole 2111 with the floating of the floating ball 2211. Further, the flange-type linear bearing 213 sleeved in the guide hole 2111 is fixed on the bracket 21, the first link 2212 is disposed in the shaft hole of the flange-type linear bearing 213, and the first link 2212 moves up and down in the shaft hole of the flange-type linear bearing 213, so that the displacement of the first link 2212 in the radial direction of the guide hole 2111 can be further limited, and the first link 2212 is subjected to smaller resistance when moving up and down due to the action of the flange-type linear bearing 213.

The displacement subunit 222 includes a second link 2221. The second link 2221 includes a first end 2222, a second end 2223, and a connecting portion 2224 located between the first end 2222 and the second end 2223. The first end 2222 is provided with a strip-shaped hole 2225 along the length direction of the second link 2221, one end of the first link 2212, which is far away from the floating ball 2211, is provided with a positioning pin 2213, and the positioning pin 2213 is inserted into the strip-shaped hole 2225, so that the first end 2222 is rotatably connected with the first link 2212, and the second link 2221 is rotated around the positioning pin 2213. Since the first end 2222 is provided with the strip-shaped hole 2225, when the first link 2212 is displaced in the radial direction of the guide hole 2111, the positioning pin 2213 has a space for movement, thereby preventing the positioning pin 2213 from being locked and the second link 2221 from being unable to rotate. The connecting portion 2224 forms a through hole 2226, the second link 2221 is inserted into the receiving groove 2124, and a fixed shaft 2227 is inserted into the through hole 2226 through the positioning hole 2125, so that the connecting portion 2224 is rotatably connected to the bracket 21, and the second link 2221 can rotate around the fixed shaft 2227. The second end 2223 penetrates the fixed plate 212 to be positioned at one side of the fixed plate 212, and moves up and down as the second link 2221 rotates around the fixed shaft 2227 while floating with the floating ball 2211.

The sensing unit 223 is fixed on the fixing plate 212 and located at one side of the second link 2221. The sensing unit 223 includes at least two inductors 2231. Each sensor 2231 is configured to sense whether the second end 2223 moves to a predetermined position with the rotation of the second link 2221. Each preset position corresponds to a liquid level reached by the liquid in the container. In this manner, each float subunit 221 can detect changes in liquid between multiple levels. The sensor 2231 may be a non-contact sensor 2231, such as a distance sensor, a photoelectric sensor, a laser sensor, or the like.

In the present embodiment, the liquid level detection module 20 includes two liquid level detection units 22, and the two liquid level detection units 22 respectively include a first floating sub-unit 221a and a second floating sub-unit 221 b. The sensing units 223 corresponding to the first floating sub-unit 221a and the second floating sub-unit 221b respectively include two inductors 2231. Two preset positions of the second end 2223 sensed by the two sensors 2231 corresponding to the first floating subunit 221a correspond to a first high liquid level and a first low liquid level of the liquid in the container, so that the first floating subunit 221a detects a change of the liquid between the first high liquid level and the first low liquid level. Two preset positions of the second end 2223 sensed by the two sensors 2231 corresponding to the second floating subunit 221b correspond to a second high liquid level and a second low liquid level of the liquid in the container, so that the second floating subunit 221b detects a change of the liquid between the second high liquid level and the second low liquid level. Wherein the second low liquid level is higher than the first high liquid level, and the detection of four different liquid levels is realized by the first floating sub-unit 221a and the second floating sub-unit 221 b. Further, each sensor 2231 is fixed with a limiting member 2232, the second end 2223 abuts against one limiting member 2232 when rotating to one sensor 2231, and the second end 2223 abuts against the other limiting member 2232 when rotating to the other sensor 2231, so as to limit the moving range of the second end 2223.

The control module 30 sends a liquid inlet signal to the liquid inlet module 10 when sensing that the liquid position is lower than the first low liquid level. The feed signal comprises one or more of feed rate, total liquid amount, or liquid type. In one embodiment, the first low liquid level is one seventh of the height of the container, and when the liquid level is lower than the one seventh of the height of the container, the control module 30 sends a liquid inlet signal for increasing the liquid inlet speed to twice the standard liquid inlet speed to the liquid inlet module 10 or sends a liquid inlet signal for increasing the liquid inlet speed to two seventh of the container to the liquid inlet module 10 or sends a liquid inlet signal for the liquid containing solids to the liquid inlet module 10. In one embodiment, the feed signal sent by the control module 30 includes increasing the feed rate to twice the standard feed rate, sending a volume of feed liquid that is two-sevenths of the vessel, and/or sending a liquid containing solids, when the level of liquid is less than one-seventh of the vessel height, as described above. So, when lower liquid level, through increasing the predetermined height reducible feed liquor time that the feed liquor speed made liquid get into the container, through sending the liquid that contains the solid at lower liquid level, avoid liquid to take place to block up at the entering container in-process, so, improve the supply efficiency of liquid. The control module 30 sends a liquid inlet speed reduction signal to the liquid inlet module 10 when sensing that the liquid position is higher than the second low liquid level, so as to slow down the liquid inlet speed. The control module 30 further sends a stop signal to the liquid feeding module 10 when sensing that the liquid position reaches a second high liquid level, so as to stop feeding liquid. Wherein, after the liquid level reaches first high liquid level, can adopt standard inlet velocity control liquid to get into the container, until the liquid level reaches second low liquid level. In one embodiment, corresponding to the first low liquid level being one seventh of the height of the container, the second low liquid level being four seventh of the height of the container, when the liquid level is higher than the four seventh of the height of the container, the control module 30 sends a liquid inlet signal for reducing the liquid inlet speed to one half of the standard liquid inlet speed to the liquid inlet module 10 or sends a liquid inlet signal for reducing the liquid inlet amount to one seventh of the container to the liquid inlet module 10 or sends a liquid inlet signal for oil-containing liquid to the liquid inlet module 10. In one embodiment, the liquid feeding signal sent by the control module 30 includes decreasing the liquid feeding speed to half of the standard liquid feeding speed, sending a liquid feeding amount equal to one-seventh of the container, and/or sending a liquid containing oil when the liquid level is higher than four-seventh of the container height. So, when higher liquid level, can avoid liquid to spill over the container through reducing the predetermined height that the inlet velocity made liquid get into the container, through sending oily liquid at higher liquid level, compare in the liquid that contains the solid, get into the container more easily to guarantee that liquid normally flows into the container.

Referring to fig. 5, in another embodiment, the liquid level detecting and controlling system 100 further includes a temperature control module 40. The temperature control module 40 is used for sensing and adjusting the temperature of the liquid in the container. The control module 30 is further in communication connection with the temperature control module 40 to control the temperature control parameters of the temperature control module 40 according to the detection result of the liquid level detection module 20. Specifically, the control module 30 sends a temperature raising signal to the temperature control module 40 when receiving the signal of the liquid level rising detected by the liquid level detection module 20, so as to raise the temperature of the liquid, so as to keep the temperature of the liquid in the container constant. When receiving a signal that the liquid position detected by the liquid level detection module 20 is lower than a first preset liquid level, the control module 30 sends a temperature-stop signal or a temperature-reduction signal to the temperature control module 40 to stop heating or reduce the temperature of the liquid. In one embodiment, the first preset liquid level is the same as the first low liquid level, and when the liquid level is lower than the first low liquid level, a temperature-stop signal is sent to the temperature control module 40 to stop heating the liquid or reduce the temperature of the liquid. So, when the liquid level is lower, through control by temperature change module 40 stop heating or cooling, can avoid producing the overheated phenomenon of liquid because of the liquid volume in the container is less to guarantee that liquid temperature is in certain extent, avoid liquid temperature to neglect high and neglect low, avoid appearing the phenomenon of dry combustion method in the container simultaneously. When receiving a signal that the liquid level detected by the liquid level detection module 20 is higher than a second preset liquid level, the control module 30 sends a temperature rise signal to the temperature control module 40 to raise the temperature of the liquid. In one embodiment, the second preset liquid level is the same as the second low liquid level, and when the liquid level is higher than the second low liquid level, a temperature raising signal is sent to the temperature control module 40 to raise the temperature of the liquid. So, when the liquid level is higher, heat up through control by temperature change module 40, can avoid making the production liquid low phenomenon excessively because of the liquid volume in the container is great to avoid the liquid temperature to neglect high and suddenly low in certain extent. Therefore, the liquid level detection and control system 100 heats the liquid through the temperature control module 40 according to the amount of the liquid in the container, and avoids the phenomenon that the temperature of the liquid is suddenly high or too low.

The displacement subunit 222 connected to the floating subunit 221 in the liquid level detection and control system 100 is located above the container and is not affected by impurities in the liquid, and the movement of the displacement subunit 222 sensed by the sensing unit 223 can accurately reflect the liquid level in the container, so that the accuracy of liquid level monitoring is improved, and the control module 30 can accurately control the supply or discharge of the liquid according to the liquid level.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not to be taken as limiting the present application, and that suitable changes and modifications of the above embodiments are within the scope of the disclosure claimed in the present application as long as they are within the spirit and scope of the present application.