A limiting device for the floating ball stroke of a liquid level floating ball switch

Abstract

The utility model provides a kind of liquid level float ball switch upper floating ball stroke's stop device, including terminal box, hollow tube in the middle position of terminal box bottom, the hollow tube lower end is equipped with stud, the notch that is communicated with the interior space of hollow tube is opened in the stud lower surface, floating ball is rotatably installed in the notch, two supporting plates are symmetrically installed in the stud outer surface, the long circle mouth that is arranged along the length direction of supporting plate is opened in the supporting plate upper surface, multiple the pressing plate for pressing and holding floating ball is inserted in the long circle mouth, the hole is opened in the upper position of one side surface of pressing plate, screw rod is inserted in the hole, screw rod is arranged in parallel with supporting plate, one end of screw rod is connected with hollow tube, nut is equipped with on the both sides of screw rod length direction of pressing plate, nut is connected with screw rod thread, the utility model has the following beneficial effects: realize the multi-point support of floating ball, prevent floating ball from being deformed and damaged due to stress concentration.

Description

Technical Field

[0001] This utility model relates to a limiting device for the stroke of a float ball in a liquid level float switch, and belongs to the field of liquid level float switches. Background Technology

[0002] A side-mounted float switch is a liquid level control device specifically designed for side-mounted applications. Its core function is to monitor the liquid level in a container by moving the float laterally. It is particularly suitable for special working conditions such as horizontal storage tanks and side-opening containers where installation from the top or bottom is not possible. In its structural design, the float is typically cylindrical or ellipsoidal and connected to the mounting bracket via a hinge point. It rotates laterally around the hinge point using the buoyancy of the liquid, thereby achieving dynamic sensing of changes in the liquid level.

[0003] In actual operation, as the liquid level in the container gradually rises, the buoyancy of the float increases, causing it to rotate upwards around the hinge point. When the liquid level reaches a set threshold and the float rotates to its highest position, a small portion of the float's tip will directly contact the hinge point. At this point, the buoyancy of the float is concentrated at the hinge point through the contact point, creating a significant local compressive force. Because floats are typically designed with thin walls (such as hollow structures or thin-walled shells) to ensure buoyancy, their thickness is relatively thin. Under continuous compressive force, the contact area is prone to plastic deformation or even cracking due to stress concentration, leading to float damage. This damage not only affects the float's buoyancy stability and rotational flexibility but may also cause switch malfunctions or failures. In severe cases, the entire float assembly needs to be replaced, increasing maintenance costs and downtime. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a limiting device for the stroke of a float in a liquid level float switch, thereby solving the problems mentioned in the background art. This invention provides multi-point support for the float, preventing the float from deforming and being damaged due to stress concentration.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a limit device for the stroke of a float ball in a liquid level float switch, comprising a junction box, a hollow tube at the bottom center of the junction box, a column head installed at the lower end of the hollow tube, a notch on the lower surface of the column head communicating with the internal space of the hollow tube, a float ball rotatably installed in the notch, two support plates symmetrically installed on the outer surface of the column head, an elongated opening arranged along the length of the support plate on the upper surface of the support plate, multiple pressure plates for holding the float ball inserted in the elongated opening, a through hole at the upper part of one side of the pressure plate, a screw inserted in the through hole, the screw being arranged parallel to the support plate, one end of the screw being connected to the hollow tube, nuts on both sides of the pressure plate along the length of the screw, the nuts being threadedly connected to the screw.

[0006] Furthermore, the end of the screw near the hollow tube is threaded with an internal threaded sleeve, which is fixedly connected to the hollow tube.

[0007] Furthermore, a connector is installed at the bottom of the junction box. The connector has a rectangular structure, and fixing holes are provided at the four corners of the upper surface of the connector.

[0008] Furthermore, a hollow docking seat is provided on the lower side of the connecting seat. The docking seat has a rectangular structure. Circular holes are provided at the four corners of the upper surface of the docking seat. Bolts are inserted into the space formed by the fixing hole and the circular holes. A support cylinder for supporting the sealing ring is installed on the lower surface of the docking seat. The support cylinder is sleeved on the hollow tube.

[0009] Furthermore, two support frames are installed at the center of the lower surface of the connecting seat. A convex ring is fitted onto the end of the hollow tube near the connecting seat and is fixed to the hollow tube. The end of the support frame away from the connecting seat is connected to the convex ring by screws.

[0010] Furthermore, a detachable top cover is installed on the upper end of the junction box, and a cable inlet is installed on the annular side of the junction box.

[0011] Furthermore, a connecting post is rotatably installed within the notch via a pin, and one end of the connecting post is fixedly connected to the float.

[0012] The beneficial effects of this utility model are: 1. The elongated opening on the support plate limits the movement trajectory of the pressure plate. When the float rotates to the preset highest position, the pressure plate abuts against the edge of the support plate, preventing the float from continuing to rotate upwards. This avoids direct contact between the top of the float and the hinge point of the column head, eliminating the conditions for generating compressive force at the source. An elongated opening is made on the support plate on the outer surface of the column head. Multiple pressure plates press the side of the float along the length of the screw, forming a linear support surface rather than a single-point contact. When the float rotates to the highest position, the pressure plates evenly distribute the compressive force generated by buoyancy to the side of the float, avoiding stress concentration at traditional hinge points and preventing the float from deforming or cracking due to localized compression.

[0013] 2. The pressure plate is fixed by nuts at both ends of the screw. The position of the pressure plate can be adjusted according to the size of the float, and it can be adapted to cylindrical or ellipsoidal floats of different specifications, thus improving the versatility of the lifting device.

[0014] 3. By connecting the support frame and the convex ring with screws, the hollow tube is supported by the structure formed by the two support frames and the connecting seat, thereby improving the stability of the structure. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a limit device for the stroke of a float in a liquid level float switch according to the present invention; Figure 2 This is another perspective view of the limiting device for the stroke of the float ball in a liquid level float switch according to this utility model; Figure 3 This is an assembly diagram of the column head, support plate, hollow tube, connecting seat and junction box in the limiting device for the stroke of the float ball in a liquid level float switch according to this utility model. Figure 4 This is a schematic diagram of the assembly of the pressure plate, nut and screw in the limiting device for the float stroke of a liquid level float switch according to this utility model; In the diagram: 1-junction box, 2-connector, 3-connecting seat, 4-support cylinder, 5-support plate, 6-pressure plate, 7-screw, 8-column head, 9-float, 10-internal threaded sleeve, 11-hollow tube, 12-inlet, 13-top cover, 14-support frame, 15-convex ring, 16-oblong opening, 17-through hole, 18-nut, 19-notch. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a limit device for the stroke of a float ball in a liquid level float switch, including a junction box 1, a detachable top cover 13 installed on the upper end of the junction box 1, a wire inlet 12 installed on the annular side of the junction box 1, a hollow tube 11 installed in the middle of the bottom of the junction box 1, a column head 8 installed at the lower end of the hollow tube 11, a notch 19 opened on the lower surface of the column head 8 communicating with the internal space of the hollow tube 11, a connecting column is rotatably installed in the notch 19 through a pin, so that one end of the connecting column is connected and fixed to the float ball 9, thus completing the rotatable connection between the float ball 9 and the column head 8.

[0018] See Figures 1-4Two support plates 5 are symmetrically installed on the outer surface of the column head 8. An elongated oval opening 16, arranged along the length of the support plate 5, is provided on the upper surface of the support plate 5. Multiple pressure plates 6 for holding the float 9 are inserted into the elongated oval opening 16. A through hole 17 is provided on the upper part of one side of the pressure plate 6, and a screw 7 is inserted into the through hole 17. The screw 7 is arranged parallel to the support plate 5. An internal threaded sleeve 10 is threaded to the end of the screw 7 near the hollow tube 11. The internal threaded sleeve 10 is connected and fixed to the hollow tube 11, allowing one end of the screw 7 to be screwed into the internal threaded sleeve 10, facilitating the assembly and disassembly of the screw 7 and the hollow tube 11. The pressure plates 6 extend along the length of the screw 7. Nuts 18 are provided on both sides of the direction, and the nuts 18 are threadedly connected to the screw 7. The elongated opening 16 on the support plate 5 provides a moving guide trajectory for the pressure plate 6. When the float 9 rotates to the preset highest position, the pressure plate 6 will abut against the edge of the support plate 5, thereby preventing the float 9 from continuing to rotate upward and avoiding direct contact between the top of the float 9 and the hinge point of the column head 8. This eliminates the conditions for the generation of compressive force from the root. An elongated opening 16 is opened on the support plate 5 on the outer surface of the column head 8. Multiple pressure plates 6 press the side of the float 9 along the length of the screw 7, so that the float 9 changes from the traditional single-point contact force to linear support surface force. When the float 9 rotates to the highest position, the pressure plate 6 can evenly distribute the compressive force generated by buoyancy to the side of the float 9, effectively avoiding the stress concentration problem at the traditional hinge point and preventing the float 9 from deforming or cracking due to local compression. In addition, the pressure plate 6 is fixed by the nuts 18 at both ends of the screw 7. The position of the pressure plate 6 can be flexibly adjusted according to the size of the float 9, which can adapt to cylindrical or ellipsoidal floats 9 of different specifications, significantly improving the versatility of the device.

[0019] See Figures 1-3 A connector 2 is installed at the bottom of the junction box 1. The connector 2 has a rectangular structure and fixing holes are provided at the four corners of the upper surface of the connector 2. A hollow docking seat 3 is provided on the lower side of the connector 2. The docking seat 3 has a rectangular structure and round holes are provided at the four corners of the upper surface of the docking seat 3. Bolts are inserted into the space formed by the fixing holes and the round holes. A support cylinder 4 for supporting the sealing ring is installed on the lower surface of the docking seat 3. The support cylinder 4 is sleeved on the hollow tube 11. When the position of the connector 2 is restricted by the bolt, the bolt also passes through the round hole, so that the bolt plays the role of restricting the relative position of the connector 2 and the docking seat 3. Two support frames 14 are installed in the middle of the lower surface of the connector 2. A convex ring 15 is sleeved on the end of the hollow tube 11 near the connector 2 and is fixed to the hollow tube 11. The end of the support frame 14 away from the connector 2 is connected to the convex ring 15 by screws. After the support frame 14 is connected to the convex ring 15 by screws, the hollow tube 11 is stably supported by the support structure formed by the two support frames 14 and the connecting seat 2, which effectively improves the stability of the overall structure.

[0020] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A limit device for the stroke of a float in a liquid level float switch, comprising a junction box (1), characterized in that: A hollow tube (11) is installed at the bottom center of the junction box (1). A post head (8) is installed at the lower end of the hollow tube (11). A notch (19) communicating with the internal space of the hollow tube (11) is opened on the lower surface of the post head (8). A float (9) is rotatably installed in the notch (19). Two support plates (5) are symmetrically installed on the outer surface of the post head (8). An elongated oval opening (16) arranged along the length of the support plate (5) is opened on the upper surface of the support plate (5). Multiple pressure plates (6) for holding the float (9) are installed in the elongated opening (16). A through hole (17) is opened on the upper part of one side of the pressure plate (6). A screw (7) is installed in the through hole (17). The screw (7) is arranged parallel to the support plate (5). One end of the screw (7) is connected to the hollow tube (11). Nuts (18) are provided on both sides of the pressure plate (6) along the length of the screw (7). The nuts (18) are threadedly connected to the screw (7).

2. The limiting device for the stroke of the float ball in a liquid level float switch according to claim 1, characterized in that: The screw (7) is threaded to an internal thread sleeve (10) at one end near the hollow tube (11), and the internal thread sleeve (10) is fixedly connected to the hollow tube (11).

3. The limiting device for the stroke of the float ball in a liquid level float switch according to claim 1, characterized in that: The junction box (1) is equipped with a connector (2) at the bottom. The connector (2) is a rectangular structure, and fixing holes are provided at the four corners of the upper surface of the connector (2).

4. The limiting device for the float stroke of a liquid level float switch according to claim 3, characterized in that: The connecting seat (2) has a hollow docking seat (3) on its lower side. The docking seat (3) has a rectangular structure. The four corners of the upper surface of the docking seat (3) are provided with round holes. Bolts are inserted in the space formed by the fixing hole and the round holes. A support cylinder (4) for supporting the sealing ring is installed on the lower surface of the docking seat (3). The support cylinder (4) is sleeved on the hollow tube (11).

5. The limiting device for the stroke of the float ball in a liquid level float switch according to claim 3, characterized in that: Two support frames (14) are installed at the middle of the lower surface of the connecting seat (2). A convex ring (15) is fitted on one end of the hollow tube (11) near the connecting seat (2) and is fixed to the hollow tube (11). The end of the support frame (14) away from the connecting seat (2) is connected to the convex ring (15) by screws.

6. The limiting device for the float stroke of a liquid level float switch according to claim 1, characterized in that: The junction box (1) is equipped with a detachable top cover (13) at the upper end, and the junction box (1) is equipped with a wire inlet (12) on the annular side.

7. The limiting device for the stroke of the float ball in a liquid level float switch according to claim 1, characterized in that: A connecting column is rotatably installed in the notch (19) via a pin, and one end of the connecting column is connected and fixed to the float (9).

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