A filter screen structure for a liquid level sensor

Abstract

The utility model discloses a filter screen structure of liquid level sensor belongs to liquid level sensor technical field, including the shell, the upper end of shell is established with internal thread groove, the inside of shell is provided with filter screen body, the internal thread groove of shell is provided with the lifting mechanism, the filter screen body is fixed in the lower extreme of lifting mechanism, the lifting mechanism includes sealing cap, locating seat and support slide bar, the locating seat is fixed in the upper end of filter screen body, the support slide bar is connected in the inside of locating seat and slides, the sealing cap is connected in one end of support slide bar and slides, the utility model discloses the lifting mechanism of setting, when replacing filter screen, only need to rotate sealing cap, can synchronous lifting filter screen body out, avoided the complicated step of filter screen separate taking out in traditional separation type design, effectively solved the problem that filter screen stuck in shell is difficult to take out, significantly improved the convenience and efficiency of filter screen replacement.

Description

Technical Field

[0001] This utility model relates to the field of liquid level sensor technology, specifically to a filter structure for a liquid level sensor. Background Technology

[0002] Liquid level sensors are widely used in real-time monitoring and control of liquid levels in many fields such as modern industrial production, environmental monitoring, and daily life. As an important component of liquid level sensors, the filter screen's main function is to filter impurities in the liquid and prevent them from entering the sensor, thereby ensuring the measurement accuracy and service life of the liquid level sensor.

[0003] Currently, most common liquid level sensor filter structures adopt a separate design, with the filter and housing being independent components. When replacing the filter, operators need to open the housing and manually remove the filter separately. This method is not only cumbersome, but also prone to problems such as small gaps between the filter and the inner wall of the housing, or impurities getting stuck, making the filter difficult to remove. This significantly reduces filter replacement efficiency and increases maintenance and time costs. Furthermore, traditional filter structures often use a sealing cap to directly press the filter, which has significant drawbacks. If the sealing cap is not screwed in properly, the filter cannot be effectively secured, causing it to wobble during liquid level sensor operation. This not only affects the filtration effect but may also lead to measurement errors due to filter instability, affecting the sensor's normal operation. Therefore, a new filter structure for liquid level sensors is needed to solve the problems existing in current technology. Utility Model Content

[0004] The purpose of this invention is to provide a filter structure for a liquid level sensor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a filter structure for a liquid level sensor, comprising a housing, an internal threaded groove at the upper end of the housing, a filter body inside the housing, a lifting mechanism in the internal threaded groove of the housing, the filter body being fixed to the lower end of the lifting mechanism, the lifting mechanism comprising a sealing cover, a positioning seat, and a supporting slide rod, the positioning seat being fixed to the upper end of the filter body, the supporting slide rod being slidably connected inside the positioning seat, and the sealing cover being slidably connected to one end of the supporting slide rod.

[0006] Preferably, the positioning seat is rotatably connected to a rotating ring plate, and one end of the supporting slide rod is fixed to the upper end face of the rotating ring plate.

[0007] Preferably, the lower end of the sealing cap is fixed with a threaded protrusion, which is threadedly adapted to the internal thread groove of the outer shell.

[0008] Preferably, the upper end face of the positioning seat is provided with an annular clearance opening, and the support slide rod is slidably connected in the annular clearance opening of the positioning seat.

[0009] Preferably, a sleeve plate is fixedly fitted inside the inner cavity of the sealing cover on the surface of the supporting slide rod, and a return spring is fitted on the part of the supporting slide rod that extends into the inner cavity of the sealing cover. One end of the return spring is fixed to the upper end face of the sleeve plate, and the other end of the return spring is fixed to the inner top wall of the sealing cover.

[0010] Preferably, the lower end of the housing is fixed with an external threaded connector, which is threadedly connected to the interface at the bottom of the liquid level sensor.

[0011] This invention provides a filter structure for a liquid level sensor, which has the following advantages compared with the prior art:

[0012] With its lifting mechanism, when replacing the filter, simply unscrew the sealing cap to simultaneously lift out the filter body. This avoids the cumbersome steps of removing the filter separately in traditional detachable designs, effectively solving the problem of the filter getting stuck in the outer casing and making it difficult to remove, thus significantly improving the convenience and efficiency of filter replacement.

[0013] The positioning seat, support slide, and return spring are designed to apply pressure to the support slide by the return spring, and the pressure is transmitted to the filter screen body through the positioning seat. This ensures that the filter screen is firmly compressed inside the housing, reducing filter screen shaking during use, ensuring stable operation of the filtration function, and preventing the normal operation of the liquid level sensor from being affected by a loose filter screen. The elastic positioning seat can adaptively adjust according to the tightness between the sealing cap and the housing, overcoming the defect of poor sealing effect caused by insufficient screwing when the traditional sealing cap directly squeezes the filter screen. This ensures a tight fit between the sealing cap and the housing, improving the overall sealing performance and reliability of the structure. Attached Figure Description

[0014] Figure 1 This is a three-dimensional view of the overall structure of this utility model;

[0015] Figure 2 This is a perspective view of the internal thread groove structure of this utility model;

[0016] Figure 3 This is a three-dimensional cross-sectional view of the positioning seat of this utility model.

[0017] In the diagram: 1. Outer shell; 2. External threaded connector; 3. Internal threaded groove; 4. Filter screen body; 5. Lifting mechanism; 6. Sealing cover; 7. Positioning seat; 8. Support slide rod; 9. Rotating ring plate; 10. Return spring; 11. Sleeve plate; 12. Threaded protrusion; 13. Annular clearance opening. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-3 This utility model provides a filter structure for a liquid level sensor, including a housing 1. The upper end of the housing 1 has an internal threaded groove 3. A filter body 4 is disposed inside the housing 1. The filter body 4 is built into the housing 1. Liquid flows in through the housing holes of the housing 1, is filtered by the outer side of the filter body 4, and then enters the inner area. During this process, the filter body 4 effectively intercepts liquid impurities, preventing them from entering the detection area of ​​the liquid level sensor and ensuring the accuracy of the sensor's liquid level sensing.

[0020] A lifting mechanism 5 is provided in the internal thread groove 3 of the outer shell 1. The filter body 4 is fixed at the lower end of the lifting mechanism 5. The lifting mechanism 5 includes a sealing cover 6, a positioning seat 7 and a support slide rod 8. The positioning seat 7 is fixed at the upper end of the filter body 4. The support slide rod 8 is slidably connected inside the positioning seat 7. The sealing cover 6 is slidably connected to one end of the support slide rod 8.

[0021] When the filter body 4 needs to be replaced, unscrew the sealing cap 6 along the inner threaded groove 3 of the outer shell 1. During the rotation, the support slide rod 8 passing through the surface of the sealing cap 6 drives the rotating ring plate 9 to twist within the positioning seat 7. When the threaded protrusion 12 of the sealing cap 6 disengages from the inner threaded groove 3 of the outer shell 1, since the filter body 4 and the sealing cap 6 are integrated through the connecting structure, the filter body 4 can be removed simultaneously simply by lifting the sealing cap 6, solving the problem of cumbersome and jamming removal of the filter in the traditional separate design.

[0022] Further as Figure 1 , Figure 2 and Figure 3 As shown, it is worth noting that the positioning seat 7 is internally rotatably connected to a rotating ring plate 9, one end of the support slide rod 8 is fixed to the upper end face of the rotating ring plate 9, the lower end of the sealing cover 6 is fixed with a threaded protrusion 12, the threaded protrusion 12 is threadedly matched with the internal thread groove 3 of the outer shell 1, and the upper end face of the positioning seat 7 is provided with an annular clearance opening 13, and the support slide rod 8 is slidably connected in the annular clearance opening 13 of the positioning seat 7.

[0023] Further as Figure 3As shown, it is worth noting that a sleeve plate 11 is fixedly fitted on the surface of the support slide rod 8 in the inner cavity of the sealing cover 6. A return spring 10 is fitted on the part of the support slide rod 8 that extends into the inner cavity of the sealing cover 6. One end of the return spring 10 is fixed to the upper end face of the sleeve plate 11, and the other end of the return spring 10 is fixed to the inner top wall of the sealing cover 6. An external threaded connector 2 is fixed at the lower end of the outer shell 1. The external threaded connector 2 is threadedly connected to the interface at the bottom of the liquid level sensor.

[0024] When the filter body 4 is installed into the outer shell 1 along with the sealing cover 6, the threaded protrusion 12 is screwed into the internal threaded groove 3. The return spring 10, which is sleeved on the outside of the support slide rod 8, is fixed at both ends to the sealing cover 6 and the sleeve plate 11, respectively. The compressive force generated by the spring is transmitted to the positioning seat 7 through the support slide rod 8, so that the positioning seat 7 compresses and fixes the filter body 4, thereby enhancing the stability of the filter in the outer shell 1. At the same time, the elastic positioning seat 7 can adaptively adjust the contact distance between the sealing cover 6 and the outer shell 1, avoiding the problem of poor sealing effect caused by the sealing cover not being screwed in properly.

[0025] The solution has the following working process: Before use, the outer shell 1 is fixed to the bottom of the liquid level sensor by the external threaded connector 2. When the filter is used, the filter screen body 4 is set inside the outer shell 1. The liquid entering from the housing hole of the outer shell 1 will be filtered by the outside of the filter screen body 4 and then enter the inner area of ​​the filter screen body 4. The filter screen body 4 intercepts impurities in the liquid to prevent impurities from directly entering the detection part of the liquid level sensor and causing the sensor to be unable to accurately detect changes in liquid level.

[0026] When the filter body 4 needs to be replaced, the sealing cover 6 is unscrewed along the internal thread groove 3 of the outer shell 1. During the rotation of the sealing cover 6, the support slide rod 8 passing through its surface drives the rotating ring plate 9 to twist inside the positioning seat 7. When the end of the threaded protrusion 12 of the sealing cover 6 leaves the internal thread groove 3 of the outer shell 1, the filter body 4 and the sealing cover 6 are connected to form an integral whole. Thus, by controlling the lifting of the sealing cover 6, the filter body 4 can be lifted out of the outer shell 1 simultaneously. This eliminates the cumbersome steps that require the filter body 4 to be removed separately due to the traditional separate design of the sealing cover 6 and the filter body 4, especially when the filter body 4 is stuck in the outer shell 1, which makes it difficult to remove.

[0027] When the filter body 4 is inserted into the outer shell 1 through the sealing cover 6, the threaded protrusion 12 is screwed into the inner threaded groove 3 of the outer shell 1. Since the return spring 10 is sleeved on the outside of the support slide rod 8, and the two ends of the return spring 10 are respectively fixed between the sealing cover 6 and the sleeve plate 11, the compressive force applied by the return spring 10 to the support slide rod 8 is transmitted to the positioning seat 7. The positioning seat 7 can exert a compressive effect on the filter body 4 inserted into the outer shell 1, which can reduce the stability of the filter body 4 inside the outer shell 1 during use. In addition, the positioning seat 7 with elastic adaptability can adapt to the tightness between the sealing cover 6 and the outer shell 1, improving the situation where the sealing cover 6 has poor sealing effect when directly squeezing the filter body 4 due to the sealing cover 6 not being screwed into place.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Although embodiments of this utility model have been shown and described, this does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model. Regarding the embodiments of this utility model, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A filter screen structure for a liquid level sensor comprising a housing (1), characterized in that: The upper end of the outer shell (1) is provided with an internal thread groove (3). The interior of the outer shell (1) is provided with a filter body (4). The internal thread groove (3) of the outer shell (1) is provided with a lifting mechanism (5). The filter body (4) is fixed at the lower end of the lifting mechanism (5). The lifting mechanism (5) includes a sealing cover (6), a positioning seat (7) and a support slide rod (8). The positioning seat (7) is fixed at the upper end of the filter body (4). The support slide rod (8) is slidably connected inside the positioning seat (7). The sealing cover (6) is slidably connected to one end of the support slide rod (8).

2. The filter structure of a liquid level sensor according to claim 1, characterized in that: The positioning seat (7) is rotatably connected to a rotating ring plate (9), and one end of the support slide rod (8) is fixed to the upper end face of the rotating ring plate (9).

3. The filter structure of a liquid level sensor according to claim 1, characterized in that: The lower end of the sealing cover (6) is fixed with a threaded boss (12), which is threadedly adapted to the internal thread groove (3) of the outer shell (1).

4. The filter structure of a liquid level sensor according to claim 2, characterized in that: The upper end face of the positioning seat (7) is provided with an annular clearance opening (13), and the support slide rod (8) is slidably connected in the annular clearance opening (13) of the positioning seat (7).

5. The filter structure of a liquid level sensor according to claim 1, characterized in that: A sleeve plate (11) is fixedly fitted on the surface of the support slide rod (8) in the inner cavity of the sealing cover (6). A return spring (10) is fitted on the part of the support slide rod (8) that extends into the inner cavity of the sealing cover (6). One end of the return spring (10) is fixed on the upper end face of the sleeve plate (11), and the other end of the return spring (10) is fixed on the inner top wall of the sealing cover (6).

6. The filter structure of a liquid level sensor according to claim 1, characterized in that: The lower end of the housing (1) is fixed with an external threaded connector (2), which is threadedly connected to the interface at the bottom of the liquid level sensor.

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