Liquid level sensor and liquid level instrument
By canceling the central axis and using a flexible control line to pull the float, the problem of the float and shaft adhesion of the liquid level monitoring equipment when the liquid becomes viscous, achieving normal monitoring of the liquid level.
Patent Information
- Application Number
- CN202421656106.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-12
AI Technical Summary
When the transformer oil becomes viscous, the float and the shaft are prone to stick together, resulting in failure to work normally.
A liquid level sensor was designed, which eliminated the central axis in the traditional solution, and used a flexible first control line and a second control line to pull the float, so that the float could move independently and avoid interacting with other fixtures.
The non-resistance movement of the float is achieved, and the liquid level can be monitored even if the liquid becomes viscous, avoiding the adhesion problem between the float and the shaft.
Smart Images
Figure CN222866025U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of liquid level detection, and in particular relates to a liquid level sensor and a liquid level meter. Background Art
[0002] Transformers are important equipment to ensure the normal operation of power systems. Monitoring the oil level of transformers is an important indicator for determining whether transformers are operating safely and stably.
[0003] The existing monitoring equipment mainly includes a vertical center shaft, with a float on the outside of the center shaft, and two reed switches are set inside the center shaft, namely the upper reed switch and the lower reed switch. The upper reed switch is at the highest oil level, and the lower reed switch is at the lowest oil level. A magnet that triggers the reed switch is set on the float, and the float moves up and down with the oil level. When the oil level reaches a high level, the magnet triggers the upper reed switch, and when the oil level drops to a low level, the magnet triggers the lower reed switch, thereby realizing the monitoring of the oil level.
[0004] As the transformer oil is used for a long time, the viscosity of impurities will increase, and the viscosity of transformer oil will also change due to temperature, becoming thicker at low temperatures. Therefore, the float and the shaft will be stuck to the oil, and the float will not be able to provide information about the amount of oil in the cylinder, and the monitoring equipment will not work properly. Summary of the invention
[0005] The utility model aims to provide a liquid level sensor and a liquid level meter, which can monitor the liquid level even when the liquid becomes viscous.
[0006] The technical solution is as follows:
[0007] The liquid level sensor of the utility model comprises:
[0008] A frame body provided with a cavity, the frame body provided with a channel for liquid to flow into the cavity, and reed switches installed on the top and bottom of the frame body;
[0009] a float movably disposed in the cavity, the float being provided with a magnet, the float having a first position and a second position, the height of the first position being greater than the height of the second position;
[0010] A flexible first control line, one end of which is connected to the bottom of the frame, and the other end of which is connected to the float, and when the float is in the first position, the first control line is straightened;
[0011] A flexible second control line has one end connected to the top of the frame and the other end connected to the float. When the float is in the second position, the second control line is straightened.
[0012] In one embodiment, the frame is a cylinder, the float is a disc, and the first control line and the second control line are each provided with a plurality of them, one end of which is connected to the frame at intervals along the circumferential direction, and the other end of which is connected to the float at intervals along the circumferential direction.
[0013] In one embodiment, the frame is provided with a plurality of fixing columns, the top of the fixing columns is provided with a first mounting hole, and the bottom of the fixing columns is provided with a second mounting hole, the circumferential side wall of the float is provided with a plurality of flanges, the flanges are provided with a third mounting hole and a fourth mounting hole, one end of the first control line is connected to the second mounting hole, and the other end is connected to the fourth mounting hole; one end of the second control line is connected to the first mounting hole, and the other end is connected to the third mounting hole.
[0014] In one embodiment, there are three fixing columns, and the angle between each two of the fixing columns and the center of the frame is 120°; there are three flanges, and the angle between each two of the flanges and the center of the float is 120°.
[0015] In one of the embodiments, support columns are spaced apart along the circumference of the frame, and the support columns and the fixing columns are hollowed out to form the channel.
[0016] In one embodiment, the flange extends in a vertical direction, a center line connecting the third mounting hole and the fourth mounting hole is a vertical line, and the third mounting hole is arranged above the fourth mounting hole.
[0017] In one embodiment, magnets are provided at the top and bottom of the float.
[0018] In one embodiment, the reed switch is respectively installed on the inner surface of the top wall of the frame and the inner surface of the bottom wall of the frame.
[0019] In one embodiment, the first control line and the second control line are both soft nylon lines.
[0020] The liquid level meter of the utility model comprises any one of the above-mentioned liquid level sensors.
[0021] The technical solution provided by the utility model has the following advantages and effects:
[0022] The float is movably arranged in the cavity and is pulled by a flexible first control line and a second control line. The float is independent and does not interact with other fixing parts, so adhesion will not occur, thereby avoiding the adhesion problem between the float and the shaft. The floating and falling process of the float is only connected to the control line, and the float can float up and down freely, so that the liquid level can be monitored even when the liquid becomes viscous. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1A three-dimensional diagram of a float in a first position of an embodiment of a liquid level sensor of the utility model;
[0024] Figure 2 A three-dimensional diagram of a float in a second position of an embodiment of a liquid level sensor of the utility model;
[0025] Figure 3 This is a schematic diagram of a float in an embodiment of a liquid level sensor according to the utility model between a first position and a second position.
[0026] Description of reference numerals:
[0027] 10. frame, 11. cavity, 12. fixing column, 121. first mounting hole, 122. second mounting hole, 13. channel, 14. supporting column,
[0028] 20. float, 21. flange, 211. third mounting hole, 212. fourth mounting hole, 22. magnet,
[0029] 30. First control line,
[0030] 40. Second control line,
[0031] 50. Reed switch. DETAILED DESCRIPTION
[0032] In order to facilitate the understanding of the present invention, the specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.
[0033] Unless otherwise specified or defined, the "first, second..." used in this article is merely used to distinguish names and does not represent a specific quantity or order.
[0034] Unless specifically stated or defined otherwise, the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0035] It should be noted that, in this document, “fixed to” or “connected to” may mean directly fixing or connecting to an element, or indirectly fixing or connecting to an element.
[0036] In order to solve the problem that the float and the shaft stick together when the transformer oil becomes viscous, and the liquid level monitoring cannot be realized, the utility model designs a liquid level sensor, which eliminates the central shaft of the traditional solution, so that when the float floats up and down with the oil level, it no longer rubs or sticks with the central shaft, and the float moves without resistance. Therefore, it is also called "undamped liquid level sensor". Even when the transformer oil becomes viscous, the oil level can be monitored. It should be noted that the liquid level sensor of the utility model can be used not only for transformer oil oil level monitoring, but also for other types of liquid level monitoring.
[0037] like Figure 1-3 As shown, the liquid level sensor of the embodiment of the utility model is a frame 10, which is in the shape of a cylinder, and is provided with a cavity 11 inside. A float 20 is installed in the cavity 11, and the float 20 is in the shape of a disc, and the diameter of the float 20 is smaller than the diameter of the frame 10. A first control line 30 and a second control line 40 are connected between the float 20 and the frame 10, wherein one end of the first control line 30 is connected to the bottom of the frame 10, and the other end is connected to the float 20; one end of the second control line 40 is connected to the top of the frame 10, and the other end is connected to the float 20. The first control line 30 and the second control line 40 are flexible items such as lines and ropes, which are straightened when stretched by external force, and are curled or bent when there is no external force. In this embodiment, the first control line 30 and the second control line 40 are extremely thin nylon lines, and the resistance in the oil can be ignored.
[0038] When oil is added to the oil cylinder, the float 20 rises with the oil level due to the buoyancy. After the oil is added to the set height, the float 20 rises to the highest point, such as near the top of the cavity 10. This is the first position of the float 20, and the first control line 30 is straightened. When the oil cylinder is draining oil, the float 20 drops with the oil level. After the oil is drained, the float 20 falls to the lowest point due to gravity, such as near the bottom of the cavity 10. This is the second position of the float 20, and the second control line 40 is straightened. In other words, the float 20 is active in the cavity 11 and rises and falls with the oil level. It should be noted that the first position and the second position are not limited to a specific position, and the first position and the second position can be determined accordingly according to the highest oil level and the lowest oil level that need to be monitored in the cavity 11.
[0039] Reed switches are often used in liquid level sensors to indicate oil levels. Therefore, reed switches 50 are installed at the center of the top and bottom of the frame 10, and a magnet is provided on the float 20. In the first position, the magnet on the float 20 connects the reed switch 50 at the top and outputs a signal (oil level high signal), indicating that the oil level has reached a preset maximum height. In the second position, the magnet on the float 20 connects the reed switch 50 at the bottom and outputs a signal (oil level low signal), indicating that the oil level has reached a preset minimum height. In this embodiment, the reed switch 50 is respectively installed on the inner surface of the top wall of the frame 10 and the inner surface of the bottom wall of the frame 10. Magnets 22 are provided at the top and bottom of the float 20, and the magnetism of the magnet 22 at the top is opposite to that of the magnet 22 at the bottom. In the first position, the magnet at the top connects the reed switch 50 at the top wall, and in the second position, the magnet at the bottom connects the reed switch 50 at the bottom wall, making liquid level monitoring more accurate. It should be noted that the installation position of the reed switch 50 is related to the first position and the second position and is not limited to the top wall or the bottom wall. It can be near the top of the frame or near the bottom of the frame, as long as the magnet can make the reed switch connected in the first position and the second position.
[0040] Since the float 20 is movably arranged in the cavity 11 and suspended on the transformer oil surface, in order to make the float 20 more stable, and in the first position and the second position, the axis of the float 20 is substantially coincident with the axis of the frame 10, ensuring that the float 20 can connect the reed switch 50 at the bottom or the top. In some examples, there are multiple first control lines 30 and second control lines 40, and one end of the first control line 30 and the second control line 40 is connected to the frame 10 at intervals along the circumferential direction, and the other end is connected to the float 20 at intervals along the circumferential direction, and the orientation of the float 20 is limited by multiple first control lines 30 and multiple second control lines 40. Specifically, in this embodiment, three fixing columns 12 are provided on the frame 10, and three flanges 21 are provided on the circumferential side wall of the float 20. The top end of the fixing column 12 is provided with a first mounting hole 121, and the bottom end is provided with a second mounting hole 122. The flange 21 is provided with a third mounting hole 211 and a fourth mounting hole 212. One end of the first control line 30 is connected to the second mounting hole 122, and the other end is connected to the fourth mounting hole 212; one end of the second control line 40 is connected to the first mounting hole 121, and the other end is connected to the third mounting hole 211. The angle between each two fixing columns 12 and the center of the frame 10 is 120°, and the angle between each two flanges 21 and the center of the float 20 is 120°. The top and bottom ends of the float 20 are respectively connected to the top wall and the bottom wall of the frame 10, and the orientation of the float 20 is limited by three first control lines 30 and second control lines 40 arranged at 120° to each other, so that the float 20 will not deviate from the center.
[0041] The fixed columns 12 are hollowed out to form a channel 13 for transformer oil to flow into the cavity 11. In some examples, in order to improve the structural strength of the frame 10, support columns 14 are also arranged at intervals along the circumference of the frame 10, and the support columns 14 and the fixed columns 12 are hollowed out to form a channel 13 for transformer oil to flow into the cavity.
[0042] It is easy to understand that the space between the fixing columns 12 of the frame 10 and between the fixing columns 12 and the supporting columns 14 can also be closed, and an oil inlet for the transformer oil to flow into the cavity 11 is provided at the bottom end of the frame 10 .
[0043] In this embodiment, the flange 21 extends in a vertical direction, the third mounting hole 211 is arranged above the fourth mounting hole 212, and the center line of the third mounting hole 211 and the fourth mounting hole 212 is a vertical line, so that the float 20 will not rotate when the float 20 moves between the first position and the second position.
[0044] It should be noted that the shapes of the frame 10 and the float 20 are not limited and may also be quadrilateral, pentagonal or other shapes.
[0045] In summary, in this embodiment, the central axis is eliminated and the float is pulled by a soft nylon line. The float is independent and does not interact with other fixing parts, so adhesion will not occur, thereby avoiding the adhesion problem between the float and the axis. The floating and falling process of the float is only connected to the control line, and the float floats up and down freely. Even when the transformer oil becomes viscous, the oil level can be monitored, thereby truly feeding back the oil amount in the oil cylinder.
[0046] Based on the above-mentioned liquid level sensor, the utility model also provides a liquid level meter, which includes any one of the above-mentioned liquid level sensors.
[0047] The above embodiments are not exhaustive enumerations based on the present invention, and there may be multiple other implementations not listed. Any replacement and improvement made without violating the concept of the present invention shall fall within the protection scope of the present invention.
Claims
1. A liquid level sensor, characterized in that: include: A frame body provided with a cavity, the frame body provided with a channel for liquid to flow into the cavity, and reed switches installed on the top and bottom of the frame body; a float movably disposed in the cavity, the float being provided with a magnet, the float having a first position and a second position, the height of the first position being greater than the height of the second position; A flexible first control line, one end of which is connected to the bottom of the frame, and the other end of which is connected to the float, and when the float is in the first position, the first control line is straightened; A flexible second control line has one end connected to the top of the frame and the other end connected to the float. When the float is in the second position, the second control line is straightened.
2. The liquid level sensor according to claim 1, characterized in that: The frame is a cylinder, the float is a disc, and the first control line and the second control line are both provided with a plurality of them, one end of which is connected to the frame at intervals along the circumferential direction, and the other end of which is connected to the float at intervals along the circumferential direction.
3. The liquid level sensor according to claim 2, characterized in that: The frame is provided with a plurality of fixing columns, the top end of the fixing columns is provided with a first mounting hole, and the bottom end is provided with a second mounting hole, the circumferential side wall of the float is provided with a plurality of flanges, the flanges are provided with a third mounting hole and a fourth mounting hole, one end of the first control line is connected to the second mounting hole, and the other end is connected to the fourth mounting hole; one end of the second control line is connected to the first mounting hole, and the other end is connected to the third mounting hole.
4. The liquid level sensor according to claim 3, characterized in that: There are three fixing columns, and the angle between each two of the fixing columns and the center of the frame is 120°. There are three flanges, and the angle between each two of the flanges and the center of the float is 120°.
5. The liquid level sensor according to claim 3, characterized in that: Support columns are also arranged at intervals along the circumference of the frame, and the support columns and the fixing columns are hollowed out to form the channel.
6. The liquid level sensor according to claim 3, characterized in that: The flange extends in a vertical direction, a center line connecting the third mounting hole and the fourth mounting hole is a vertical line, and the third mounting hole is arranged above the fourth mounting hole.
7. The liquid level sensor according to claim 1, characterized in that: The top and bottom ends of the float are both provided with magnets.
8. The liquid level sensor according to claim 1, characterized in that: The reed switches are respectively mounted on the inner surface of the top wall of the frame and the inner surface of the bottom wall of the frame.
9. The liquid level sensor according to claim 1, characterized in that: The first control line and the second control line are both soft nylon lines.
10. A liquid level meter, characterized in that: Comprising a liquid level sensor as described in any one of claims 1-9.