Liquid level control switch and blowdown system
By using an isolated liquid level control switch, and through the cooperation of a liquid guide tube and a baffle plate, the problems of sticking and short life of float-type liquid level switches are solved, resulting in higher operational reliability and reduced maintenance costs.
Patent Information
- Application Number
- CN202511568056.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-01-23
AI Technical Summary
Float-type level switches are prone to getting stuck in sewage tanks and have a short service life, causing the sewage solenoid valve to fail to start and stop properly, and poor internal insulation prevents the switch from operating.
The liquid level control switch adopts an isolated design, with the limit switch located outside the target container. Through the cooperation of the liquid guide tube and the liquid baffle, the liquid impact force triggers the push rod to move the limit switch, controlling the opening and closing of the drain valve and preventing the limit switch from contacting the liquid.
It improves the reliability and service life of liquid level control, reduces maintenance costs, and avoids limit switch failures caused by liquid contact.
Smart Images
Figure CN121386933A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of liquid level switch, in particular to a liquid level control switch and a blowdown system. BACKGROUND
[0002] At present, the sewage tank of the sewage treatment system of the power plant mostly adopts the floating ball type liquid level switch to control the liquid level of the sewage tank, that is, when the floating ball type liquid level switch rises, the switch is closed, and the blowdown electromagnetic valve is opened; when the floating ball type liquid level switch falls, the switch is opened, and the blowdown electromagnetic valve is closed. However, the floating ball type liquid level switch has some deficiencies in actual work: the floating ball type liquid level switch often gets stuck in some structural frames in the sewage tank when it floats with the water surface, which causes the blowdown electromagnetic valve to be unable to start and stop normally; the floating ball type liquid level switch has a short service life because it is in water for a long time, and often has the problems of insufficient internal insulation and inaction of the switch. SUMMARY
[0003] The present application provides the following technical solutions:
[0004] A liquid level control switch for controlling the liquid level in a target container, comprising:
[0005] a liquid guide pipe, a first end of the liquid guide pipe being arranged at a target liquid level position in the target container, a second end of the liquid guide pipe being located outside the target container, the second end being arranged downward and being lower than the first end;
[0006] a limit switch, the limit switch being located below the second end and being electrically connected with a blowdown valve on a blowdown pipe of the target container;
[0007] a liquid blocking plate, the liquid blocking plate being arranged between the second end and the limit switch, a lower surface of the liquid blocking plate being provided with a push rod for triggering the limit switch;
[0008] a support, the support being fixed opposite to the limit switch and being connected with the liquid blocking plate through an elastic support member.
[0009] Optionally, in the liquid level control switch, the first end of the liquid guide pipe is provided with a filter screen covering a port.
[0010] Optionally, in the liquid level control switch, a center of the liquid blocking plate is upwardly convex and is aligned with the port of the second end of the liquid guide pipe, and an upper surface of the liquid blocking plate is conical.
[0011] Optionally, in the liquid level control switch, the support comprises two or more support columns uniformly distributed around the center of the liquid blocking plate, and the elastic support member is arranged in one-to-one correspondence with the support columns.
[0012] Optionally, in the liquid level control switch, the push rod is vertically arranged and connected to the center of the lower surface of the liquid blocking plate.
[0013] Optionally, in the liquid level control switch, a support table is included, and the support and the limit switch are arranged on the top of the support table.
[0014] Optionally, in the liquid level control switch, a housing is included to provide a containing space, and the support table and the liquid blocking plate are located in the containing space, the support table is fixed to the bottom of the housing, and the housing is provided with a liquid outlet at a position lower than the top of the support table.
[0015] Optionally, in the liquid level control switch, a connecting frame is included, and the two ends of the connecting frame are fixedly connected with the outer wall of the target container and the outer wall of the housing, respectively.
[0016] Optionally, in the liquid level control switch, the top of the housing is provided with a top cover for closing the containing space, and the top cover is provided with a through hole for connecting the liquid guide pipe.
[0017] A sewage discharge system, comprising:
[0018] a target container for containing the discharged sewage;
[0019] The liquid level control switch disclosed in any one of the above is used to control the liquid level in the target container.
[0020] According to the above technical solution, the limit switch electrically connected with the liquid discharge valve on the liquid discharge pipe of the target container is arranged outside the target container, below the second end of the liquid guide pipe, and the liquid blocking plate connected with the push rod on the lower surface is arranged between the second end and the limit switch, and the first end of the liquid guide pipe is arranged at the target liquid level position in the target container. In operation, the liquid guide pipe guides the liquid in the target container to the target liquid level position to the outside of the target container to form a liquid flow impacting the liquid blocking plate, the impact force makes the liquid blocking plate and the push rod move downward together to overcome the elastic restoring force of the elastic support, and the push rod triggers the limit switch to act after descending to a certain position. In this way, the normally open contact of the limit switch is closed to interlock the opening of the liquid discharge valve on the liquid discharge pipe of the target container, avoiding the continuous rise of the liquid level in the target container, and achieving the purpose of controlling the liquid level in the target container.
[0021] The liquid level control switch of the present application adopts an isolation design, and the limit switch does not come into contact with the liquid, which has higher working reliability compared with the floating ball type liquid level switch, is conducive to prolonging the service life and reducing the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute a part of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.
[0023] Figure 1 is a schematic diagram of an arrangement of a liquid level control switch according to an embodiment of the present application;
[0024] Figure 2 is Figure 1 is an enlarged schematic view of A in FIG. 1, showing components inside the housing;
[0025] Figure 3 is Figure 1 is an enlarged schematic view of B in FIG. 1, showing a filter screen of the liquid guide port.
[0026] In the drawings, the following are marked:
[0027] 1, target container; 2, liquid discharge valve; 3, wall hole; 4, liquid guide; 5, connecting frame; 6, housing; 7, collection pool; 8, discharge pipe; 9, liquid inlet pipe; 10, filter screen; 11, liquid blocking plate; 12, first elastic support; 13, second elastic support; 14, second support column; 15, first support column; 16, support table; 17, limit switch; 18, push rod. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.
[0029] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate way in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.
[0030] In the description of the present specification, the relational terms such as first and second and the like are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying that there is any such actual relationship or order between them. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or apparatus that includes a list of elements does not only include those elements, but also includes other elements not expressly listed, or further includes elements inherent in such process, method, article or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.
[0031] Referring to Figures 1-3 The embodiment of the present application provides a liquid level control switch for controlling the liquid level in a target container 1, which comprises a liquid guide pipe 4, a limit switch 17, a liquid blocking plate 11 and a bracket, wherein the first end of the liquid guide pipe 4 is arranged at a target liquid level position in the target container 1, the second end of the liquid guide pipe 4 is located outside the target container 1, the position of the second end is lower than that of the first end and is arranged downward, the limit switch 17 is located below the second end of the liquid guide pipe 4, the liquid blocking plate 11 is arranged between the second end of the liquid guide pipe 4 and the limit switch 17, the lower surface of the liquid blocking plate 11 is provided with a push rod 18 for triggering the limit switch 17, and the limit switch 17 is electrically connected with a liquid discharge valve 2 on a liquid discharge pipe of the target container 1. The bracket is fixedly arranged opposite to the limit switch 17 and connected with the liquid blocking plate 11 through an elastic support.
[0032] The working principle of the liquid level control switch of the present application is as follows: as the liquid is continuously discharged into the target container 1 through the liquid inlet pipe 9, the liquid level gradually rises to the target liquid level position of the first end of the liquid guide pipe 4, then the liquid enters the liquid guide pipe 4 and flows to the upper side of the liquid blocking plate 11 outside the target container 1, and the liquid falling from the liquid guide pipe 4 falls on the liquid blocking plate 11, the falling liquid generates an impact force on the liquid blocking plate 11, causing the elastic support to deform, so that the liquid blocking plate 11 and the push rod 18 arranged on the lower surface of the liquid blocking plate 11 move downward together, the push rod 18 descends to a certain position and triggers the limit switch 17 to act, so that the normally open contact of the limit switch 17 is closed to interlock the opening of the liquid discharge valve 2 on the liquid discharge pipe of the target container 1, and the liquid in the target container 1 starts to be discharged outward to make the liquid level drop, when the liquid level in the target container 1 drops below the target liquid level position, no liquid enters the liquid guide pipe 4, so that the liquid blocking plate 11 is no longer impacted by the liquid, and the spring support restores the deformation, so that the liquid blocking plate 11 and the push rod 18 move upward together, the limit switch 17 is disconnected to interlock the closing of the liquid discharge valve 2 on the liquid discharge pipe of the target container 1, and the liquid level in the target container 1 stops dropping.
[0033] The liquid level control switch of the present application adopts an isolated design, the limit switch 17 is arranged outside the target container 1, and the liquid baffle 11 is used to shield above the limit switch 17, the limit switch 17 does not contact with the liquid, therefore, compared with the floating ball type liquid level switch, the working reliability of the liquid level control switch of the present application is higher.
[0034] The liquid level control switch of the present application can be applied to many different scenarios, in some embodiments, the target container 1 can be a sewage tank or a sewage pool for containing sewage, of course, in other embodiments, the target container 1 can be a container for containing non-sewage, for example, it can be a cache tank for containing ordinary water. Considering that in some scenarios, there may be sundries in the liquid contained in the target container 1, in order to avoid the sundries flowing into the liquid guide pipe 4, a filter screen 10 covering the port can be arranged at the first end of the liquid guide pipe 4, the filter screen 10 can be used to avoid some solid impurities entering the liquid guide pipe 4, which is beneficial to reduce the possibility of the liquid guide pipe 4 being blocked by foreign matters.
[0035] Referring to Figure 3 , in order to increase the area of the filter screen 10, the filter screen 10 can be arranged in a shell shape, for example, it can be arranged in a cylindrical shape, a cuboid shape, etc., the first end of the liquid guide pipe 4 penetrates from one surface of the filter screen 10, and the filter screen 10 forms a full-dimensional three-dimensional surrounding around the first end of the liquid guide pipe 4. Referring to Figure 1 , in some embodiments, the first end of the liquid guide pipe 4 can be arranged with the port upwardly arranged, the port is located at the preset target liquid level position, so that when the liquid level in the target container 1 rises to the target liquid level position, the liquid can more easily flow into the liquid guide pipe 4 under the action of gravity.
[0036] The main function of the liquid guide pipe 4 is to guide the liquid reaching the target liquid level position out of the target container 1, then form a descending liquid flow impacting the liquid baffle 11, so that the liquid baffle 11 moves downwardly, and the limit switch 17 is triggered by the push rod 18 connected to the lower surface of the liquid baffle 11. It is easy to understand that the liquid guide pipe 4 penetrates the wall hole 3 on the target container 1 in a sealed manner, and a water potential for the liquid to flow spontaneously is formed from the first end to the second end of the liquid guide pipe 4. In some embodiments, the liquid guide pipe 4 can be configured as a stainless steel pipe with a hole diameter of 12 cm, of course, in other embodiments, the material and pipe diameter of the liquid guide pipe 4 can be flexibly arranged according to the needs, which is not limited in the present application.
[0037] Referring to Figure 1 and Figure 2In some embodiments, the baffle 11 can be configured to bulge upwards from the center and align with the port of the second end of the liquid guide tube 4, and the upper surface of the baffle 11 is conical. That is, the upper surface of the baffle 11 is entirely conical with a bulging center; for example, the baffle 11 can be configured as an umbrella shape. The upward bulge of the center of the baffle 11 creates a water potential from the center to the edge on the upper surface of the baffle 11. Thus, when the water level in the target container 1 drops below the target liquid level, the liquid that falls onto the baffle 11 will not accumulate on the baffle 11, but will fall entirely from the edge of the baffle 11. Therefore, there is no additional liquid weight on the baffle 11, allowing the elastic support to recover its deformation more reliably. It should be understood that, in order to ensure that the falling liquid exerts sufficient impact force on the baffle plate 11 so that the baffle plate 11 and the push rod 18 can overcome the elastic restoring force of the elastic support and move downward, the slope formed by the center of the protrusion on the upper surface of the baffle plate 11, which is equivalent to the edge, should not be too large. Generally, a slope angle of about 5° is sufficient. For example, the slope angle can be 3°, 8°, etc. In addition, it should be noted that the projection shape of the baffle plate 11 in the vertical direction can be a circle, rectangle, pentagon, etc., and this application does not limit it in this regard.
[0038] In some embodiments, the support may include two or more pillars evenly distributed around the center of the baffle 11, with elastic supports corresponding to each pillar. For example, in Figure 2 In the illustrated embodiment, two supports can be provided: a first support 15 and a second support 14. The first support 15 and the second support 14 are symmetrically distributed about the vertical centerline of the baffle plate 11. The upper end of the first support 15 is connected to the baffle plate 11 via a first elastic support member 12, and the upper end of the second support 14 is connected to the baffle plate 11 via a second elastic support member 13. In other embodiments, the number of supports can be three, four, or other values. Because these supports are evenly distributed around the center of the baffle plate 11, the force on the baffle plate 11 can be balanced, thereby reducing the possibility of the baffle plate 11 tilting after long-term use.
[0039] In some embodiments, the push rod 18 can be vertically mounted and connected to the center of the lower surface of the baffle plate 11. This configuration allows for a more balanced mass distribution of the push rod 18 and the baffle plate 11, which facilitates balanced stress distribution on each elastic support component, thereby ensuring stable and reliable elastic deformation and reducing failure rate and subsequent maintenance costs. The elastic support component can be configured as various forms, such as a coil spring or a sheet spring, and this application does not limit its application to these forms.
[0040] See Figure 2In some embodiments, the liquid level control switch can include a support table 16, and the support and limit switch 17 is arranged on the top of the support table 16. The support table 16 has a certain height, which serves to elevate the limit switch 17, so that the liquid falling from the liquid baffle 11 is less likely to contact the limit switch 17, thereby ensuring the safety of the limit switch 17. It should be understood that the projection of the liquid baffle 11 in the vertical direction completely covers the support table 16, that is, the cross-sectional dimension of the support table 16 is smaller than the covering area of the liquid baffle 11, so that the liquid falling from the liquid baffle 11 will not fall on the support table 16, but will fall around the support table 16.
[0041] Referring to Figure 1 and Figure 2 In some embodiments, the liquid level control switch can include a housing 6 that provides an accommodation space, and the support table 16 and the liquid baffle 11 are located in the accommodation space. The support table 16 is fixed to the bottom of the housing 6, and the housing 6 is provided with a liquid discharge port below the top of the support table 16. The housing 6 can protect the components such as the support table 16 and the liquid baffle 11 located in the accommodation space thereof, and can also collect the liquid falling from the liquid baffle 11, so that the liquid flows to a designated position along the liquid discharge port of the housing 6. For example, the liquid discharge port of the housing 6 can be connected with a discharge pipe 8, and the liquid falling from the liquid baffle 11 flows into the collection tank 7 through the discharge pipe 8. The liquid discharge port of the housing 6 can be arranged on the bottom of the housing 6, or on the position close to the bottom of the side wall of the housing 6. In some embodiments, the support table 16 can be arranged as a stainless steel square column, and the housing 6 can be arranged as a stainless steel housing. The support table 16 is fixedly connected with the inner surface of the bottom of the housing 6 by welding.
[0042] The structure of the housing 6 can have various options. For example, the housing 6 can be arranged as a barrel shape, that is, the housing 6 can be arranged as a structure with an open top. For another example, the top of the housing 6 can be provided with a top cover that closes the accommodation space, and the top cover is provided with a through hole for connecting the liquid guide pipe 4. It should be noted that the second end of the liquid guide pipe 4 can be arranged to extend into the accommodation space of the housing 6 through the through hole of the top cover, or the second end can be arranged to abut with the through hole of the top cover without extending into the accommodation space of the housing 6.
[0043] Referring to Figure 1 In some embodiments, the liquid level control switch can include a connecting frame 5, and the two ends of the connecting frame 5 are fixedly connected with the outer wall of the target container 1 and the outer wall of the housing 6, respectively. In this structure, the housing 6 is fixedly connected with the outer wall of the target container 1 through the connecting frame 5, which can not only ensure the stability of the housing 6, but also arrange the housing 6 at a certain height position, thereby leaving a layout space below the housing 6 for arranging other components such as the discharge pipe 8.
[0044] Based on the liquid level control switch provided in the present application, the present application further provides a sewage discharge system, which comprises the liquid level control switch and a target container 1, wherein the target container 1 is used for containing discharged sewage, and the liquid level control switch is used for controlling the liquid level in the target container 1. The working principle and technical effects of the liquid level control switch can refer to the foregoing description of the liquid level control switch, and will not be repeated here. Since the liquid level control switch disclosed in the foregoing embodiments has the above technical effects, the sewage discharge system with the liquid level control switch also has the above technical effects, and will not be repeated here. In some embodiments, the sewage discharge system can be a component of a power plant sewage treatment system, and the target container 1 can be a sewage tank of the power plant.
[0045] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0046] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A liquid level control switch for controlling the liquid level in a target container, characterized by, include: A liquid guide tube, wherein the first end of the liquid guide tube is located at the target liquid level position inside the target container, and the second end of the liquid guide tube is located outside the target container, and the position of the second end is lower than that of the first end and is set downward; A limit switch is located below the second end, and the limit switch is used to electrically connect to the drain valve on the drain pipe of the target container; A liquid baffle is positioned between the second end and the limit switch, and a push rod for triggering the limit switch is provided on the lower surface of the liquid baffle. The bracket is fixedly disposed relative to the limit switch and is connected to the baffle plate through an elastic support member.
2. The liquid level control switch according to claim 1, characterized in that The first end of the liquid guide tube is equipped with a filter screen covering the port.
3. The fluid level control switch of claim 1, wherein The center of the baffle plate protrudes upward and is aligned with the port of the second end of the liquid guide tube, and the upper surface of the baffle plate is conical.
4. The fluid level control switch of claim 3, wherein, The support includes two or more pillars evenly distributed around the center of the baffle plate, and the elastic support is provided in a one-to-one correspondence with the pillars.
5. The fluid level control switch of claim 4, wherein, The push rod is vertically positioned and connected to the center of the lower surface of the baffle plate.
6. The liquid level control switch according to any one of claims 1 to 5, characterized in that It includes a support platform, and the bracket and the limit switch are disposed on the top of the support platform.
7. The fluid level control switch of claim 6, wherein, The device includes a housing that provides a receiving space, a support platform and a baffle plate located within the receiving space, the support platform being fixed to the bottom of the housing, and the housing having a drain outlet located below the top of the support platform.
8. The fluid level control switch of claim 7, wherein, It includes a connecting frame, the two ends of which are fixedly connected to the outer wall of the target container and the outer wall of the shell, respectively.
9. The fluid level control switch of claim 7, wherein, The top of the housing is provided with a top cover that seals the accommodating space, and the top cover is provided with a through hole for connecting the liquid guide tube.
10. A sewage system characterised in that, include: The target container is used to hold the discharged wastewater. The liquid level control switch as described in any one of claims 1 to 9 is used to control the liquid level in the target container.