A water level sensor based on physical changes

Abstract

The present invention provides a water level sensor that transmits signals based on physical changes, including a cylindrical body with a cavity inside and openings at its upper and lower ends. It is characterized in that a limit switch is arranged in the cavity of the cylindrical body. The limit switch includes a housing with an opening at the bottom, a closed top and side, and a cavity inside. In the cavity of the housing, upper and lower contact pairs are horizontally arranged. The top of the cavity of the housing is connected to the upper end of a transmission rod through a spring. A horizontal contact plate that mates with the upper and lower contact pairs is arranged on the upper part of the transmission rod. A weight is arranged at the lower end of the transmission rod. The weight is placed in a placement groove at the bottom of the cavity of the cylindrical body and is supported by a water-soluble solid in the placement groove. The water level detection is completed through the water-soluble solid, and the information on the water level change can be obtained in a timely manner. The structure is simple and not interfered by other factors, and it can accurately detect the water level data to ensure the safety of important places such as power stations.

Description

Technical Field

[0001] The present invention relates to a water level sensor, and more particularly to a water level sensor that transmits signals based on physical changes, belonging to the technical field of sensor design and manufacturing. Background Art

[0002] A water level sensor is used to obtain water level information and transmit the obtained water level information to alert people that the water level has changed and flood prevention and water hazard prevention are required. It is widely used in monitoring whether important places such as hydropower station workshops, machine rooms, and laboratories are flooded, as well as whether water pipes are cracked and leaking. Currently, there are various sensors for flood alarms on the market, such as electrode type, float type, tuning fork type, ultrasonic type sensors, etc. These sensors not only have complex structures, but also need to be powered by a power supply to work, and the obtained electrical signals need to be converted to be used for judging and calculating whether the water level exceeds the standard. This not only has a high cost, but also the obtained water level information is greatly affected or interfered with, and it is difficult to ensure accuracy. Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0003] To overcome the above-mentioned deficiencies of the prior art, the present invention provides a water level sensor that transmits signals based on physical changes, which can quickly and accurately obtain water level data, and has a simple structure, reliable performance, high sensitivity, and convenient maintenance.

[0004] The present invention is achieved through the following technical solutions: A water level sensor that transmits signals based on physical changes, including a cylindrical body with a cavity inside and open upper and lower ends. The feature is that a limit switch is arranged in the cavity of the cylindrical body. The limit switch includes a housing with an open bottom, a closed top and side, and a cavity inside. Inside the cavity of the housing, upper and lower contact pairs are horizontally arranged. The top of the cavity of the housing is connected to the upper end of a transmission rod through a spring. A horizontal contact plate that mates with the upper and lower contact pairs is arranged on the upper part of the transmission rod. A weight is arranged at the lower end of the transmission rod. The weight is placed in a placement groove at the bottom of the cavity of the cylindrical body and is supported by a water-soluble solid in the placement groove. So that when the water level in the lower part of the cylindrical body rises and enters the placement groove, the solid in the placement groove dissolves when it meets water, causing the weight to lose its supporting force and fall, while driving the transmission rod to move downward. The horizontal contact plate at the upper end of the transmission rod is connected to the lower contact pair to conduct, and then the water level rising signal is sent outwards.

[0005] The limit switch is connected to one end of a wire, and the other end of the wire extends outwards through a waterproof joint on the wall of the cylindrical body and is connected to an external water level transmitter. The water level transmitter is signal-connected to a control center through a wireless network, so that the water level signal obtained by the limit switch is transmitted to the water level transmitter through the wire, and then transmitted by the water level transmitter to a remote control center for monitoring.

[0006] The upper and lower contacts on the limit switch are centered. The upper contact pair is a normally open contact NO, and the lower contact pair is a normally closed contact NC. When the upper normally open contact NO closes and the lower normally closed contact NC disconnects, the limit switch is in the working state.

[0007] A fixing piece is sleeved on the upper part of the transmission rod. A snap ring is arranged above the fixing piece to fix the transmission rod and prevent it from falling in the cavity of the cylinder body.

[0008] A float is sleeved on the lower part of the transmission rod. A permanent magnet block is arranged on the float. Correspondingly, a measuring rod with a water level transmitter fixed at its upper end is arranged outside the cylinder body. Magnetic induction blocks are arranged at intervals on the measuring rod. A wire is connected to the magnetic induction block, and the wire is connected to the transmitter. So that when water enters the cavity of the cylinder body and rises, it drives the float to rise synchronously. After the permanent magnet block on the float is magnetically connected to the magnetic induction block on the measuring rod, the water level signal can be sent out through the wire and the transmitter on the magnetic induction block.

[0009] A fixing frame is sleeved on the outer wall of the cylinder body. The fixing frame includes a sleeve sleeved on the cylinder body. A screw hole is arranged on the sleeve, and a screw is arranged in the screw hole. The lower part of the sleeve is connected with an L-shaped plate. A shaft hole matching the outer wall of the cylinder body is arranged in the middle of the horizontal end plate of the L-shaped plate, and a through hole matching the outer wall of the measuring rod is arranged on the right side. There are two fixing holes on the vertical end plate of the L-shaped plate, and screws are arranged in the fixing holes. So that the sleeve can be fixed on the cylinder body through the screw hole and the screw, and then the L-shaped plate, the sleeve and the cylinder body can be fixed on the wall through the fixing hole and the screw.

[0010] Internal threads are arranged at the lower end of the cylinder body. Correspondingly, external threads are arranged on the outer wall of the placement groove. So that the placement groove can be screwed onto the lower end of the cylinder body through the internal and external threads.

[0011] A plurality of through holes are arranged at intervals on the bottom plate of the placement groove. So that when the water level rises above the height of the bottom plate, water enters the placement groove through the plurality of through holes, and then the salt inside it dissolves in water.

[0012] A horizontal plate is fixed at the upper end of the cylinder body. A limit switch is fixed in the middle of the horizontal plate. The horizontal plate is screwed to the upper end cover. A terminal block is fixed on the horizontal plate. Wires are connected to the upper and lower contact pairs of the limit switch through the terminal block.

[0013] The present invention has the following advantages and effects: By adopting the above technical scheme, the water level detection can be conveniently completed by using solid substances that dissolve in water when encountering water, and the information of water level change can be obtained in a timely manner. It not only has a simple structure and high horizontal measurement sensitivity, but also is not interfered by other factors, can accurately detect the water level data. At the same time, it has a simple structure and is convenient to maintain, providing reliable technical support for ensuring whether important places such as power station workshops, machine rooms, and laboratories are invaded or flooded by water, and whether the water pipes are cracked and leaking. Description of the Drawings

[0014] Figure 1 Structural schematic diagram of the present invention;

[0015] Figure 2 is Figure 1 enlarged view of part A in

[0016] Figure 3 is Figure 2 circuit structure diagram of

[0017] Figure 4 is Figure 1 upper structure diagram of Detailed implementation manners

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] The water level sensor for transmitting signals based on physical changes provided by the present invention includes a cylinder 1 with a cavity inside and open upper and lower ends. A limit switch 7 is arranged in the cavity of the cylinder 1. The limit switch 7 includes a housing 71 with an open bottom, a closed top and side, and a cavity inside. Upper and lower contact pairs 73 and 75 are horizontally arranged in the cavity of the housing 71. The top of the cavity of the housing 71 is connected to the upper end of a transmission rod 8 through a spring 72. A horizontal contact plate 74 mating with the upper and lower contact pairs 73 and 75 is arranged on the upper part of the transmission rod 8. A weight 10 is arranged at the lower end of the transmission rod 8. The weight 10 is placed in a placement groove 11 at the bottom of the cavity of the cylinder 1 and is supported by salt that dissolves in water in the placement groove 11, such as Figure 1 , Figure 2 ;

[0020] One end of the limit switch 7 is connected to one end of a wire 5. The other end of the wire 5 extends outwards through a waterproof joint 4 on the wall of the cylinder 1 and is connected to a conventional water level transmitter 13 outside. The water level transmitter 13 is signal-connected to an existing control center through a wireless network, so as to transmit the water level signal obtained by the limit switch 7 to the water level transmitter 13 through the wire 5, and then transmit it to the remote control center by the water level transmitter 13 for monitoring. The waterproof joint 4 and the water level transmitter 13 are conventional components in the prior art;

[0021] Among the upper and lower contact pairs 73 and 75 on the limit switch 7, the upper contact pair 73 is a normally open contact NO, and the lower contact pair 75 is a normally closed contact NC. When the upper normally open contact NO is closed and the lower normally closed contact NC is disconnected, the limit switch 7 is in a working state;

[0022] A fixing member 2 is sleeved on the upper part of the transmission rod 8. A snap ring 3 is arranged above the fixing member 2 to fix the transmission rod 8 and prevent it from falling in the cavity of the cylinder 1;

[0023] A float 9 is sleeved on the lower part of the transmission rod 8. A permanent magnet block is provided on the float 9. Correspondingly, a measuring rod 14 with a water level transmitter 13 fixed to its upper end is provided outside the cylinder body 1. Magnetic induction blocks are arranged at intervals on the measuring rod 14. Wires are connected to the magnetic induction blocks, and the wires are connected to a conventional transmitter in the prior art. So that when water enters the cavity of the cylinder body 1 and rises, the float 9 is driven to rise synchronously. After the permanent magnet block on the float 9 is magnetically connected to the magnetic induction block on the measuring rod 14, the water level signal can be sent out through the wire and the transmitter on the magnetic induction block, such as Figure 4 ;

[0024] A fixing frame is sleeved on the outer wall of the cylinder body 1. The fixing frame includes a sleeve 15 sleeved on the cylinder body 1. A screw hole 19 is provided on the sleeve 15, and a screw is provided in the screw hole 19. The lower part of the sleeve 15 is connected with an L-shaped plate. A shaft hole matching the outer wall of the cylinder body 1 is provided in the middle of the horizontal end plate 16 of the L-shaped plate, and a through hole matching the outer wall of the measuring rod 14 is provided on the right side. There are two fixing holes 18 on the vertical end plate 17 of the L-shaped plate, and screws are provided in the fixing holes 18. So that the sleeve 15 can be fixed on the cylinder body 1 through the screw hole 19 and the screw, and then the L-shaped plate, the sleeve 15 and the cylinder body 1 can be fixed on the wall through the fixing holes 18 and the screws;

[0025] Internal threads are provided at the lower end of the cylinder body 1. Correspondingly, external threads are provided on the outer wall of the placement groove 11. So that the placement groove 11 can be screwed onto the lower end of the cylinder body 1 through the internal and external threads;

[0026] A plurality of through holes 12 are arranged at intervals on the bottom plate of the placement groove 11. So that when the water level rises above the height of the bottom plate, it enters the placement groove 11 from the plurality of through holes 12, and then the salt inside it dissolves in water;

[0027] A horizontal plate 21 is fixed to the upper end of the cylinder body 1. A limit switch 7 is fixed in the middle of the horizontal plate 21. The horizontal plate 21 is screwed to the upper end cover 6. A wiring terminal 22 is fixed on the horizontal plate 21. A wire 5 is connected to the upper and lower contact pairs 73 and 75 of the limit switch 7 through the wiring terminal 22.

[0028] During operation, when the water level rises to the lower part of the cylinder body 1 and enters the placement groove 11 through the through holes 12, after the salt in the placement groove 11 dissolves in water, the heavy hammer 10 loses its supporting force and falls. At the same time, it drives the transmission rod 8 to move downward, so that the horizontal contact plate 74 at the upper end of the transmission rod 8 is connected to the lower contact pair 75 to conduct, and then the water level rising signal is sent to the water level transmitter 13 through the wire 5, and then transmitted by the water level transmitter 13 to the remote control center for monitoring. When the water level continues to rise, it drives the float 9 to rise synchronously. After the permanent magnet block on the float 9 is magnetically connected to the magnetic induction block on the measuring rod 14, the signal of the continuously rising water level can be sent out through the wire on the magnetic induction block to protect the safety of important places such as power station workshops, machine rooms, and laboratories.

Claims

1. A water level sensor that transmits signals based on physical changes, comprising a cylindrical body with a cavity inside and open upper and lower ends, characterized in that A limit switch is arranged in the cavity of the cylinder body. The limit switch includes a shell with an open bottom, a closed top and side parts, and a cavity inside. Inside the cavity of the shell, upper and lower contact pairs are horizontally arranged. The top of the cavity of the shell is connected to the upper end of a transmission rod through a spring. A horizontal contact plate that mates with the upper and lower contact pairs is arranged on the upper part of the transmission rod. A weight is arranged at the lower end of the transmission rod. The weight is placed in a placement groove at the bottom of the cavity of the cylinder body and is supported by a water-soluble solid in the placement groove. The limit switch is connected to one end of a wire. The other end of the wire extends outwards through a waterproof joint on the cylinder wall and is connected to an external water level transmitter. The water level transmitter is signal-connected to a control center through a wireless network. A plurality of through holes are arranged at intervals on the bottom plate of the placement groove. A float is sleeved on the lower part of the transmission rod. A permanent magnet block is arranged on the float. Correspondingly, a measuring rod with a water level transmitter fixed to its upper end is arranged outside the cylinder body. Magnetic induction blocks are arranged at intervals on the measuring rod. A wire is connected to the magnetic induction block and the wire is connected to a transmitter. A fixing piece is sleeved on the upper part of the transmission rod. A snap spring is arranged above the fixing piece. A horizontal plate is fixed to the upper end of the cylinder body. A limit switch is fixed in the middle of the horizontal plate. The horizontal plate is screwed to the upper end cover. A terminal is fixed on the horizontal plate. Wires are connected to the upper and lower contact pairs of the limit switch through the terminal.

2. The water level sensor that transmits signals based on physical changes according to claim 1, characterized in that Among the upper and lower contact pairs on the limit switch, the upper contact pair is a normally open contact NO, and the lower contact pair is a normally closed contact NC. When the upper normally open contact NO is closed and the lower normally closed contact NC is disconnected, the limit switch is in a working state.

3. The water level sensor that transmits signals based on physical changes according to claim 1, characterized in that A fixing frame is sleeved on the outer wall of the cylinder body. The fixing frame includes a sleeve sleeved on the cylinder body. A screw hole is arranged on the sleeve, and a screw is arranged in the screw hole. The lower part of the sleeve is connected to an L-shaped plate. A shaft hole that mates with the outer wall of the cylinder body is arranged in the middle of the horizontal end plate of the L-shaped plate, and a through hole that mates with the outer wall of the measuring rod is arranged on the side. There are two fixing holes on the vertical end plate of the L-shaped plate, and screws are arranged in the fixing holes.

4. The water level sensor that transmits signals based on physical changes according to claim 1, characterized in that Internal threads are arranged at the lower end of the cylinder body. Correspondingly, external threads are arranged on the outer wall of the placement groove. The placement groove is screwed to the lower end of the cylinder body through the internal and external threads.

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