Rainfall sensor

Abstract

The utility model relates to the technical field of sensors, and provides a rainfall sensor, which comprises a shell, a positioning disc, absorbent paper, a lifting rod, a stop block, a magnet, a reed switch and a height adjusting device, a water inlet is formed in the upper end of the shell, the positioning disc, the absorbent paper, the lifting rod and the check block are all located in an inner cavity in the top of the shell, and the magnet and the reed switch are both located in an inner cavity in the bottom of the shell. The positioning disc is connected with the shell through the height adjusting device, a sliding hole is formed in the positioning disc, the lifting rod penetrates through the sliding hole, the check block is fixedly connected with the upper end of the lifting rod, and the magnet is fixedly connected with the lower end of the lifting rod. The lifting rod is sleeved with the absorbent paper, the lower end of the absorbent paper abuts against the positioning disc, and the upper end of the absorbent paper abuts against the check block. The reed switch is fixedly connected with the shell and is further adjacent to the lower end of the lifting rod. The utility model has the advantages that: a mechanical pushing mode for triggering a signal is cancelled; the action of the reed switch is influenced by the magnetic force of the magnet, the sensitivity of the rainfall sensor is improved, and the structure is exquisite.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and specifically to a rain sensor. Background Technology

[0002] Rainfall sensors can be applied in agricultural irrigation. Utility model patent document CN219915971U discloses a highly reliable rainfall sensor, including a scale cap, an upper housing, a lower housing, an adjusting rod, an expansion and contraction assembly, a switch trigger assembly, a limit switch, and a first limiting mechanism. The scale cap has a water inlet at its upper end and is movably connected to the upper end of the upper housing via the first limiting mechanism. The lower part of the scale cap and the upper part of the upper housing form a hollow first chamber. The lower housing is fixedly connected to the bottom of the upper housing. The device has an internal mounting through hole, through which the adjusting rod passes and can move up and down. A support base is fixedly connected to the lower end of the adjusting rod. The expansion and contraction assembly includes an expansion plate, a spring, and a washer. The expansion plate and spring are sequentially sleeved on the adjusting rod and located between the mounting through hole and the support base. The washer is located between the expansion plate and the spring. The expansion and contraction assembly is located in the first chamber. The upper end of the switch trigger assembly can contact the side of the support base away from the expansion and contraction assembly, and the lower end abuts against the limit switch.

[0003] The switch triggering assembly includes a movable cap, a connecting rod, and a retaining ring. The upper end of the connecting rod is fixedly connected to the movable cap, and the lower end passes through the limiting through hole and the retaining ring in sequence to abut against the limit switch. The movable cap and the support base can contact each other on the side away from the expansion and contraction assembly.

[0004] In actual use, rainwater enters the first chamber through the inlet. The expansion plate absorbs water and expands, and the spring, compressed and rebounding, pushes the adjusting rod downward. The support base slowly presses the switch trigger component, which moves downward and presses against the limit switch until the limit switch opens. The opening signal is transmitted to the controller, which then prevents watering within the set time. As the expansion plate gradually dries, it shrinks, and the downward force gradually decreases. The limit switch presses against the switch trigger component and slowly moves upward until the limit switch closes. The closing signal is transmitted to the controller, which then controls the water circuit to water within the set time.

[0005] The technical solution in this patent document has the following drawbacks: the support base located at the lower end of the adjusting rod first presses the switch trigger component, causing the switch trigger component to move downward, and then mechanically pushes the limit switch to send a signal; however, during use, the switch trigger component is prone to jamming, at which point the support base will have difficulty pushing the switch trigger component, and the mechanical pushing method for triggering the signal has low sensitivity.

[0006] Therefore, how to improve the sensitivity of rain gauges is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a rain gauge sensor with improved sensitivity.

[0008] This invention is implemented as follows: a rain gauge sensor, comprising:

[0009] Housing, positioning plate, absorbent paper, lifting rod, stop block, magnet, reed switch and height adjustment device;

[0010] The upper end of the housing has a water inlet, the positioning plate, absorbent paper, lifting rod and stop block are all located in the top inner cavity of the housing, and the magnet and reed switch are all located in the bottom inner cavity of the housing;

[0011] The positioning plate is connected to the housing via the height adjustment device. The positioning plate has a sliding hole through which the lifting rod passes. The stop block is fixedly connected to the upper end of the lifting rod, and the magnet is fixedly connected to the lower end of the lifting rod.

[0012] The absorbent paper is sleeved on the lifting rod, with the lower end of the absorbent paper abutting against the positioning plate and the upper end of the absorbent paper abutting against the stop block;

[0013] The reed switch is fixedly connected to the housing, and the reed switch is also adjacent to the lower end of the lifting rod.

[0014] Furthermore, it also includes a water circuit controller, which is electrically connected to the reed switch.

[0015] Furthermore, the height adjustment device includes a handle and a positioning rod. One end of the positioning rod is fixedly connected to the handle, and the other end of the positioning rod is fixedly connected to the positioning plate. The top side wall of the housing has multiple interconnected gear slots in the vertical direction. The positioning rod is placed in the gear slot, and there is a rainfall scale value next to the gear slot.

[0016] Furthermore, it also includes a test ball, the upper end of the housing has a first through hole, the upper end of the lifting rod is slidably connected to the first through hole, the test ball is fixedly connected to the upper end of the lifting rod, and the test ball is located outside the housing.

[0017] Furthermore, it also includes a partition plate, which is fixedly disposed between the bottom inner cavity and the top inner cavity of the housing. The partition plate has a second through hole, and the lower end of the lifting rod is slidably connected to the second through hole.

[0018] A ventilation opening is provided in the housing between the partition and the positioning plate.

[0019] Compared with the prior art, the advantages of this utility model are: it eliminates the mechanical push method to trigger the signal; it improves the sensitivity of the rain sensor by influencing the action of the reed switch with the magnetic force of the magnet; after the absorbent paper absorbs water, it expands, the lifting rod rises and moves with the magnet, and when it is close to the reed switch, the magnet causes the reed switch to close, triggering the first signal to the controller; during the drying process, the absorbent paper shrinks, the lifting rod descends and moves away from the reed switch with the magnet, the reed switch opens, triggering the second signal to the controller; this utility model has a compact structure and high sensitivity. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the internal structure of the rain sensor of this utility model.

[0022] Figure 2 This is a schematic diagram of the external structure of the rain sensor of this utility model.

[0023] Figure 3 This is a front plan view of the rain sensor of this utility model.

[0024] Figure 4 yes Figure 3 The left view.

[0025] Reference numerals: 1. Housing; 11. Water inlet; 12. Top inner cavity; 13. Bottom inner cavity; 2. Positioning plate; 3. Absorbent paper; 4. Lifting rod; 5. Stop block; 6. Magnet; 7. Reed switch; 8. Height adjustment device; 81. Handle; 82. Positioning rod; 83. Gear slot; 9. Adjustment ball; 10. Partition plate; 101. Ventilation port. Detailed Implementation

[0026] This utility model provides a rain sensor that overcomes the shortcomings of the prior art, which uses mechanical actuation to trigger signals and has low sensitivity; it achieves the technical effect of compact structure and high sensitivity.

[0027] The overall concept of the technical solution of this utility model embodiment is as follows:

[0028] Rainwater enters the top cavity through the inlet at the top of the casing. The absorbent paper expands after absorbing water, pushing the stop block. The stop block raises the lifting rod, and the magnet at the lower end of the lifting rod rises accordingly. When the magnet is close to the reed switch, the magnetic force of the magnet causes the reed switch to close, and the reed switch sends a first signal to the water circuit controller, which then prevents the water circuit from watering within a set time. When the rain stops, the absorbent paper shrinks during the drying process. Under the weight of the lifting rod, the stop block, and the magnet, the lifting rod descends, and the magnet at the lower end of the lifting rod descends accordingly. The magnet moves away from the reed switch, and the reed switch returns to the open state. The reed switch sends a second signal to the water circuit controller, which then causes the water circuit to water within a set time.

[0029] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0030] See Figures 1 to 4 The preferred embodiment of this utility model.

[0031] A rain gauge, comprising:

[0032] 1. Housing; 2. Positioning plate; 3. Absorbent paper; 4. Lifting rod; 5. Stop block; 6. Magnet; 7. Reed switch; and 8. Height adjustment device.

[0033] The upper end of the housing 1 is provided with a water inlet 11, the positioning plate 2, the absorbent paper 3, the lifting rod 4 and the stop block 5 are all located in the top inner cavity 12 of the housing 1, and the magnet 6 and the reed switch 7 are all located in the bottom inner cavity 13 of the housing 1.

[0034] The positioning disk 2 is connected to the housing 1 through the height adjustment device 8. The positioning disk 2 has a sliding hole, the lifting rod 4 passes through the sliding hole, the stop block 5 is fixedly connected to the upper end of the lifting rod 4, and the magnet 6 is fixedly connected to the lower end of the lifting rod 4.

[0035] The absorbent paper 3 is sleeved on the lifting rod 4, the lower end of the absorbent paper 3 abuts against the positioning plate 2, and the upper end of the absorbent paper 3 abuts against the stop block 5;

[0036] The reed switch 7 is fixedly connected to the housing 1, and the reed switch 7 is also adjacent to the lower end of the lifting rod 4.

[0037] The mechanical actuation method for triggering the signal is eliminated; the magnetic force of magnet 6 affects the action of reed switch 7, thereby improving the sensitivity of the rain sensor; after the absorbent paper 3 absorbs water, it expands, the lifting rod 4 rises and moves with magnet 6, and when it is close to reed switch 7, magnet 6 closes reed switch 7, triggering the first signal to the controller; during the drying process, the absorbent paper 3 shrinks, the lifting rod 4 descends and moves away from reed switch 7 with magnet 6, reed switch 7 opens, triggering the second signal to the controller; this utility model has a compact structure and high sensitivity.

[0038] Magnet 6 does not need to directly contact reed switch 7; this avoids the situation in the prior art where the switch triggering component is easily stuck, making it difficult for the support to push the switch triggering component, thus preventing the switch triggering component from holding the limit switch in place.

[0039] It also includes a water circuit controller (not shown), which is electrically connected to the reed switch 7. The water circuit controller is an MCU. When the reed switch 7 is closed, it sends a first signal to the water circuit controller, which prevents the water circuit from watering within a set time. When the reed switch 7 is open, it sends a second signal to the water circuit controller, which then waters the water circuit within the set time.

[0040] The reed switch 7 can also be electrically connected to an alarm or indicator light to control the on / off state of the alarm or indicator light, and can be used in different scenarios.

[0041] The height adjustment device 8 includes a handle 81 and a positioning rod 82. One end of the positioning rod 82 is fixedly connected to the handle 81, and the other end is fixedly connected to the positioning disk 2. The top sidewall of the housing 1 has multiple interconnected slots 83 in the vertical direction. The positioning rod 82 is placed in one of the slots 83, and a rainfall scale is located next to each slot. The beneficial effect of this technical solution is that the operator uses the handle 81 to place the positioning rod 82 in different slots 83, thereby changing the height of the positioning disk 2. When the positioning rod 82 is placed in the highest slot 83, the rain sensor is at its minimum setting, and the absorbent paper 3 only needs to absorb a small amount of rainwater to bring the magnet 6 close to the reed switch 7 to trigger a signal. When the positioning rod 82 is placed in the lowest slot 83, the rain sensor is at its maximum setting, and the absorbent paper 3 needs to absorb a large amount of rainwater to bring the magnet 6 close to the reed switch 7 to trigger a signal.

[0042] It also includes a test ball 9. A first through hole is provided at the upper end of the housing 1. The upper end of the lifting rod 4 is slidably connected to the first through hole. The test ball 9 is fixedly connected to the upper end of the lifting rod 4, and the test ball 9 is located outside the housing 1. The beneficial effect of this technical solution is that the operator can grasp the test ball 9 and move it up and down, causing the test ball 9 to move along with the lifting rod 4. This allows the magnet 6 to move closer to or further away from the reed switch 7, testing whether the reed switch 7 is working properly.

[0043] It also includes a partition 10, which is fixedly disposed between the bottom inner cavity 13 and the top inner cavity 12 of the housing 1. The partition 10 has a second through hole, and the lower end of the lifting rod 4 is slidably connected to the second through hole.

[0044] A vent 101 is provided in the housing 1 between the partition 10 and the positioning plate 2. The beneficial effect of this technical solution is that the partition 10 effectively prevents rainwater from entering the bottom cavity 13 of the housing 1. The vent 101 facilitates the entry of outside air into the housing 1, helping the absorbent paper 3 to dry quickly.

[0045] The working principle of this utility model is as follows: The operator pre-places the positioning rod 82 in the required gear slot 83 to set the gear of the rain sensor; the rain sensor is installed in an open area for agricultural irrigation; when it rains, rainwater enters the top inner cavity 12 from the water inlet 11 at the top of the housing 1, the absorbent paper 3 expands after absorbing water, pushing the stop block 5, which in turn raises the lifting rod 4. The positioning plate 2 remains stationary, and the magnet 6 located at the lower end of the lifting rod 4 rises accordingly. When the magnet 6 approaches the reed switch 7, the magnetic force of the magnet 6 causes the reed switch to... When reed switch 7 is closed, it sends a first signal to the water circuit controller, which prevents the water circuit from watering within the set time. When the rain stops, the absorbent paper 3 shrinks during the drying process, and the positioning plate 2 is stationary. Under the weight of the lifting rod 4, the stop block 5, and the magnet 6, the lifting rod 4 descends, and the magnet 6 located at the lower end of the lifting rod 4 descends accordingly. The magnet 6 moves away from the reed switch 7, and the reed switch 7 returns to the open state. The reed switch 7 sends a second signal to the water circuit controller, which then waters the water circuit within the set time.

[0046] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A rainfall sensor, characterized in that: include: Shell, positioning plate, absorbent paper, lifting rod, stopper, magnet, reed switch and height adjustment device; A water inlet is provided at the upper end of the shell, the positioning plate, absorbent paper, lifting rod and stopper are all located in the top inner cavity of the shell, and the magnet and reed switch are all located in the bottom inner cavity of the shell; The positioning plate is connected to the housing through the height adjustment device, the positioning plate is provided with a sliding hole, the lifting rod passes through the sliding hole, the stopper is fixedly connected to the upper end of the lifting rod, and the magnet is fixedly connected to the lower end of the lifting rod; The absorbent paper is sleeved on the lifting rod, the lower end of the absorbent paper abuts against the positioning plate, and the upper end of the absorbent paper abuts against the stopper; The reed switch is fixedly connected to the shell, and the reed switch is also adjacent to the lower end of the lifting rod.

2. A rain sensor according to claim 1, characterized in that: It also includes a water circuit controller, which is electrically connected to the reed switch.

3. A rain sensor according to claim 1, characterized in that: The height adjustment device includes a handle and a positioning rod, one end of the positioning rod is fixedly connected to the handle, and the other end of the positioning rod is fixedly connected to the positioning plate. The top side wall of the shell is provided with a plurality of connected gear slots in the vertical direction, the positioning rod is placed in the gear slot, and a rainfall scale value is provided next to the gear slot.

4. A rain sensor according to claim 1, characterized in that: It also includes a debugging ball. The upper end of the shell is provided with a first through hole. The upper end of the lifting rod is slidably connected to the first through hole. The debugging ball is fixedly connected to the upper end of the lifting rod. The debugging ball is located outside the shell.

5. A rain sensor according to claim 1, characterized in that: It also includes a partition, which is fixedly arranged between the bottom inner cavity and the top inner cavity of the shell, and the partition is provided with a second through hole, and the lower end of the lifting rod is slidably connected to the second through hole; The shell is provided with a ventilating opening between the partition plate and the positioning plate.

Images