Liquid level control system for sewage treatment

Abstract

The utility model discloses a liquid level control system for sewage treatment, which comprises a controller, a liquid level sensing device, a main drainage device and at least one standby drainage device, the liquid level sensing device comprises a protective shell, a central component and a sensing switch, and the protective shell is of a sleeve structure with two sealed ends. A center shaft of the center assembly is arranged along the central axis of the protective shell and penetrates through the protective shell, and at least three sets of inductive switches are linearly arranged on the center shaft. The inductive switch is convexly provided with an arc-surface-shaped inductive surface, and the inductive surface is adaptive to and attached to the inner hole of the protective shell; according to the liquid level control system, the liquid level sensing device is used for collecting liquid level information, monitoring the liquid level of the sewage pool and automatically controlling the liquid level; the liquid level sensing device is simple in structure and easy to assemble, the built-in sensing switch is not affected by the sewage environment, the liquid level detection precision and reliability are improved, and the service life is prolonged; the cambered-surface-shaped induction surface of the induction switch is tightly attached to the shell, so that the working stability of the induction switch is ensured; and the detection precision is ensured by intuitively adjusting the verticality of the protective shell.

Description

Technical Field

[0001] The utility model relates to the technical field of detection, in particular to a liquid level control system for sewage treatment. Background Art

[0002] In sewage treatment, it is necessary to monitor the sewage level at all times and automatically control the liquid level. The liquid level sensing device is the core component of the liquid level control system. The commonly used liquid level sensing devices in the sewage tank are float level gauges, liquid level transmitters and ultrasonic level gauges. Because there is a lot of garbage in the water and the environment is humid, the float is often covered or entangled by garbage in actual use and cannot work normally. The liquid level transmitter is often stuck and fails, and the ultrasonic detection accuracy is poor. For non-contact liquid level detection methods, such as external liquid level pipelines, garbage in sewage can easily block the external pipelines, causing the liquid level sensor to fail; for another example, capacitive liquid level sensors, the common material of sewage tanks is stainless steel, and the ordinary non-contact liquid level sensor structure of the existing technology is used for liquid level detection. Affected by its structure and installation method, the working stability needs to be improved urgently. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a liquid level control system for sewage treatment, thereby solving one or more problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A liquid level control system for sewage treatment, comprising a controller and a liquid level sensing device, a main drainage device and at least one backup drainage device electrically connected to the controller, respectively, wherein the controller, the main drainage device and the backup drainage device are located outside a sewage tank, and the liquid level sensing device is installed on a top plate of the sewage tank, with a gap between its bottom end and the bottom of the sewage tank;

[0006] Among them, the liquid level sensing device includes a protective shell, a central component and a sensing switch. The protective shell is a sleeve structure encapsulated at both ends. The central component includes a central axis, which is arranged along the central axis of the protective shell and penetrates the protective shell, and its upper end is exposed outside the protective shell. The interior of the central axis is hollow, and at least three groups of sensing switches are linearly arranged on the central axis, which correspond to the shutdown liquid level, the start-up liquid level and at least one level of additional discharge liquid level from bottom to top. The wire group of the sensing switch is penetrated in the central axis and led out from the upper end of the central axis; the sensing switch is protrudingly provided with an arc-shaped sensing surface, which is adapted to the inner hole of the protective shell and fits with the circumferential surface of the inner hole of the protective shell, and the sensing surface is directly opposite to the inner side of the sewage tank.

[0007] Furthermore, two induction switches symmetrically located on both sides of the central axis are arranged on each liquid level.

[0008] Furthermore, the shaft section of the central axis located in the protective shell is a square shaft section, and the induction switch is installed on the vertical plane of the square shaft section.

[0009] Furthermore, the upper and lower ends of the protective shell are respectively encapsulated by a sealing top plate and a sealing bottom plate. A mounting countersunk hole is provided in the center of the sealing bottom plate, and a mounting screw hole is provided in the center of the sealing top plate. The center line of the mounting countersunk hole is colinear with the center axis of the inner hole of the protective shell. The lower end of the central axis is plugged into the mounting countersunk hole, and its upper section is a circular shaft section. The central component also includes a fixing head, which is coaxially fixed on the circular shaft section of the central axis, and the fixing head is threadedly connected to the mounting screw hole.

[0010] Furthermore, a mounting plate is fixedly arranged on the outside of the protective shell perpendicular to the central axis thereof, and the mounting plate is horizontally mounted on a plane on the top plate of the sewage tank.

[0011] Compared with the prior art, the liquid level control system for sewage treatment of the utility model has the following beneficial effects:

[0012] The liquid level control system uses a liquid level sensing device to collect liquid level information at a preset position, monitors the sewage level in the sewage pool, starts corresponding drainage equipment according to different liquid levels to discharge corresponding displacement, and automatically controls the sewage level; wherein, the liquid level sensing device has a simple structure and is easy to assemble, its protective shell is a fully enclosed design, the sensing switch is built-in, and is completely isolated from the sewage and is not affected by the sewage environment. Combined with the capacitive sensing liquid level measurement principle, the liquid level detection accuracy and reliability are improved, and the equipment has a long service life; the sensing switch is a special non-contact liquid level sensing switch, and its arc-shaped sensing surface fits tightly with the shell to ensure the working stability of the sensing switch; the central axis is arranged along the central axis of the protective shell, and the sensing switch is installed on the vertical plane of the central axis. Therefore, it is easy to intuitively adjust the verticality of the protective shell to ensure the verticality of the sensing surface of the sensing switch and the liquid level, thereby ensuring the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the liquid level control system for sewage treatment of the utility model.

[0014] Figure 2 This is the overall structure diagram of the liquid level control system for sewage treatment of the utility model;

[0015] Figure 3 for Figure 2 Middle AA section profile structure diagram;

[0016] Figure 4 for Figure 3 The local enlarged view of point I in the middle;

[0017] Figure 5 for Figure 2 Middle BB section profile structure diagram;

[0018] Figure 6 for Figure 2 A three-dimensional diagram of the assembly structure of the center induction switch assembled on the center component.

[0019] In the figure: 100, liquid level sensing device; 110, protective shell; 120, central component; 121, central axis; 122, fixed head; 123, sealing top plate; 130, mounting plate; 140, sensing switch; 141, sensing plate; 142, wire group; 150, sealing bottom plate; 200, main drainage equipment; 300, backup drainage equipment. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only the best embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] This embodiment provides a liquid level control system for sewage treatment, the components of the control system are as follows: Figure 1 As shown, it includes a controller and a liquid level sensing device 100, a main drainage device 200 and at least one backup drainage device 300 electrically connected to the controller, and collects liquid level information, including a shutdown liquid level, a start-up liquid level and at least one level of additional drainage liquid level. Each level of additional drainage liquid level corresponds to a backup drainage device 300. The controller starts the main drainage device 200 when the water level reaches the start-up liquid level according to the feedback liquid level information. During the drainage process, if the water level continues to rise and reaches the additional drainage level, the controller starts the corresponding backup drainage devices 300 in sequence according to the additional drainage liquid level information of each level, increases the discharge flow rate, and As the liquid level drops, the backup drainage equipment 300 of each level is closed in turn. When the liquid level drops to the shutdown level, the controller closes the main discharge equipment and stops all discharge operations. The sewage tank is generally a fully enclosed stainless steel box. According to the height of the sewage tank, a liquid level sensing device 100 of corresponding length is designed to cover the high and low liquid level detection inside the sewage tank. The liquid level sensing device 100 is installed on the top plate of the sewage tank and is in a vertical state. Under the condition that the preset shutdown liquid level can be detected, a distance should be set between the bottom end of the liquid level sensing device 100 and the bottom of the sewage tank to reduce the entanglement in the sewage pool from gathering outside it;

[0022] like Figure 2-Figure 6 As shown, the liquid level sensing device 100 includes a protective shell 110, a central component 120 and a sensing switch 140. The protective shell 110 is a fully enclosed sleeve structure, and the sensing switch 140 is built in the protective shell 110. The protective shell 110 is made of industrial-grade high-quality anti-fouling plastic, and the exterior is polished;

[0023] The central assembly 120 is a supporting component for installing the inductive switch 140, and includes a central axis 121 and a fixed head 122. The central axis 121 is arranged along the central axis of the protective shell 110 and penetrates the protective shell 110. It includes a square shaft segment and a circular shaft segment with a colinear center line. The square shaft segment is used to install the inductive switch 140, which is built into the protective shell 110. The circular shaft segment extends from the protective shell 110 to the outside, and is used to position the central axis 121 and the lead wire group 142. Figure 3 , Figure 4 and Figure 6 The fixing head 122 is threadedly mounted on the circular shaft segment, the upper end of the central axis 121 is positioned by the sealing top plate 123, and the lower end is plugged into the mounting countersunk hole of the sealing bottom plate 150. A mounting screw hole is provided at the center of the sealing top plate 123, and the fixing head 122 is connected to the sealing top plate 123 through the mounting screw hole. To ensure that the central axis 121 is vertically arranged along the central axis of the inner hole of the protective shell 110, the center line of the mounting countersunk hole is located on the central axis 121 of the mounting screw hole, and the central axis 121 of the mounting screw hole is collinear with the central axis of the inner hole of the protective shell 110;

[0024] Refer again Figure 3 and Figure 6 At least three groups of induction switches 140 are arranged linearly on the central axis 121, which are respectively set at the shutdown liquid level, the start liquid level and the various levels of additional discharge liquid level. The central axis 121 is hollow inside and is used to pass through the wire group 142. The wire group 142 is led out of the sewage pool from the upper end of the central axis 121; Figure 5 and Figure 6 As shown, the induction switch 140 is a capacitive liquid level sensor, and its induction plate 141 is specially designed. The induction switch 140 body can be a directly raised or bulged arc-shaped induction surface, or a support rod can be extended to protrude and set an arc-shaped plate-shaped induction plate 141, such as Figure 5 In the structure shown, the outer surface of the sensing plate 141 is a curved sensing surface, and the sensing surface is adapted to the inner hole of the protective shell 110. When installed, the sensing surface is attached to the circumference of the inner hole of the protective shell 110 and is directly opposite to any vertical inner side surface of the sewage tank;

[0025] Each group of induction switches 140 set on each collected liquid level includes two induction switches 140. The two induction switches 140 can independently detect and collect liquid level information. When one of the induction switches 140 fails, the other can ensure normal monitoring of the liquid level and information collection, and will not affect the normal use of the sewage tank. The two induction switches 140 are symmetrically located on both sides of the center line of the central axis 121 and are respectively installed on two opposite vertical planes on the square axis segment. The sensing surfaces of the two induction switches 140 are respectively opposite to the two relatively vertical inner sides of the sewage tank.

[0026] In addition, the liquid level sensing device 100 is integrally installed through a mounting plate 130 fixedly mounted on the outside of the protective shell 110. The mounting plate 130 is perpendicular to the central axis of the protective shell 110. During installation, the verticality of the protective shell 110 is ensured by adjusting the level of the mounting plate 130, thereby improving the detection accuracy of the built-in sensing switch 140.

[0027] The controller is also equipped with a fault warning module. When a circuit fault occurs in any of the induction switches 140, or when the controller determines that there is data abnormality based on the feedback liquid level information, the controller will simultaneously record and prompt the fault, making it convenient for the staff to replace it in time.

[0028] The directional words such as "inside", "outside", "upper", "lower", "side", and "end" mentioned in this article are based on Figure 1-Figure 6 The orientation relationship or coordinate relationship shown in the corresponding drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation;

[0029] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the terms "on" and "inside" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid level control system for sewage treatment, characterized in that: It comprises a controller and a liquid level sensing device, a main drainage device and at least one backup drainage device electrically connected to the controller, the controller, the main drainage device and the backup drainage device are located outside the sewage tank, the liquid level sensing device is installed on the top plate of the sewage tank, and a gap is formed between the bottom end of the liquid level sensing device and the bottom of the sewage tank; Among them, the liquid level sensing device includes a protective shell, a central component and a sensing switch. The protective shell is a sleeve structure with closed two ends. The central component includes a central axis, which is arranged along the central axis of the protective shell and penetrates the protective shell, and its upper end is exposed outside the protective shell. The interior of the central axis is hollow, and at least three groups of sensing switches are linearly arranged on the central axis, which are respectively arranged at the shutdown liquid level, the start liquid level and at least one level of additional discharge liquid level from bottom to top. The wire group of the sensing switch is penetrated in the central axis and led out from the upper end of the central axis; the sensing switch is protrudingly provided with an arc-shaped sensing surface, which is adapted to the inner hole of the protective shell and fits with the circumferential surface of the inner hole of the protective shell, and the sensing surface is directly opposite to the inner side of the sewage tank.

2. The liquid level control system for sewage treatment according to claim 1, characterized in that: Two sensing switches symmetrically located on both sides of the central axis are arranged on each liquid level.

3. The liquid level control system for sewage treatment according to claim 2, characterized in that: The shaft section of the central axis located in the protective shell is a square shaft section, and the induction switch is installed on the vertical plane of the square shaft section.

4. The liquid level control system for sewage treatment according to claim 3, characterized in that: The upper and lower ends of the protective shell are respectively encapsulated by a sealing top plate and a sealing bottom plate. A mounting countersunk hole is provided in the center of the sealing bottom plate, and a mounting screw hole is provided in the center of the sealing top plate. The center line of the mounting countersunk hole is colinear with the center axis of the inner hole of the protective shell. The lower end of the central axis is plugged into the mounting countersunk hole, and its upper section is a circular shaft section. The central component also includes a fixing head, which is coaxially fixed on the circular shaft section of the central axis, and the fixing head is threadedly connected to the mounting screw hole.

5. The liquid level control system for sewage treatment according to claim 1, characterized in that: A mounting plate is fixedly arranged outside the protective shell perpendicular to the central axis thereof, and the mounting plate is horizontally mounted on the upper plane of the top plate of the sewage tank.

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