Air pressure liquid level meter, liquid storage device and plant protection equipment

Abstract

The utility model discloses an air pressure liquid level meter, a liquid storage device and plant protection equipment. The first waterproof pipe is communicated with the air pressure sensor; the inner pipe diameter of the air guide pipe is larger than that of the first waterproof pipe, one end of the air guide pipe is communicated with the air pressure sensor through the first waterproof pipe, and the other end of the air guide pipe is used for extending into liquid to sense water pressure. Under the normal condition, the air guide pipe and the air pressure sensor can be communicated through the first waterproof pipe, so that the air pressure sensor can normally sense the air pressure of the air guide pipe, and the liquid level detection function is achieved; in addition, the air pressure sensor can be waterproof through the first waterproof pipe.

Description

Technical Field

[0001] The present application relates to the technical field of sensing devices, and in particular to a barometric level gauge, a liquid storage device, and plant protection equipment. Background Art

[0002] In the field of plant protection, automatic pesticide spraying equipment is usually integrated with a barometric level gauge. The main body of the barometric level gauge is generally installed on the top of the liquid medicine tank, with an air pressure sensor integrated inside. A vent pipe connected to the air pressure sensor is provided, and the vent pipe extends to the bottom of the liquid medicine tank. The barometric level gauge can be used to automatically monitor the height of the liquid medicine in the liquid medicine tank in real time. Under normal circumstances, since the barometric level gauge is located at the top of the liquid medicine tank, the liquid medicine in the liquid medicine tank cannot flow back through the vent pipe and contact the barometric level gauge. In addition, in order to meet normal ventilation needs, the air pressure sensor cannot be isolated and sealed from the vent pipe. Therefore, the existing air pressure sensor is generally exposed to the air connected to the vent pipe. This leads to the problem that when the liquid medicine tank accidentally topples over or even turns upside down, the liquid medicine can easily flow back through the vent pipe and contact the barometric pressure sensor, which in turn causes water ingress and damage to the barometric pressure sensor. Therefore, in the existing barometric level gauge, there is a risk of water ingress on the side where the pressure sensor is connected to the vent pipe. Utility Model Content

[0003] The purpose of the embodiments of the present utility model is to provide a barometric level gauge, a liquid storage device and a plant protection device, which can solve the above-mentioned problems existing in the prior art.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] In one aspect, a barometric level gauge is provided, comprising:

[0006] Air pressure sensor;

[0007] a first waterproof tube, connected to the air pressure sensor;

[0008] An air guide tube, the inner diameter of which is larger than the inner diameter of the first waterproof tube, one end of the air guide tube is connected to the air pressure sensor through the first waterproof tube, and the other end is used to extend into the liquid to sense the water pressure.

[0009] Optionally, a connector is further included, wherein a first sensing air chamber is provided inside the connector; the air pressure sensor includes a first sensitive element for sensing the air pressure inside the first sensing air chamber, and the first waterproof tube is connected to the connector and communicated with the first sensing air chamber.

[0010] Optionally, the connector includes a connecting head, the connecting head includes a first connecting column and a second connecting column connected to each other, an air duct is provided in the connecting head and passes through the first connecting column and the second connecting column, and the air duct is connected to the first sensing air chamber; the first waterproof tube is connected to the second connecting column, and the air guide tube is arranged outside the first waterproof tube and connected to the first connecting column.

[0011] Optionally, the first waterproof tube is sleeved on the second connecting column; and / or the air guide tube is sleeved on the first connecting column.

[0012] Optionally, the connector includes a mounting base and the connecting head, the first sensing air chamber is arranged on the mounting base, and the connecting head and the mounting base are an integrated structure.

[0013] Optionally, the connector includes a mounting seat, a flexible tube and the connecting head, the first sensing air chamber is arranged on the mounting seat, and the two ends of the flexible tube are respectively connected to the mounting seat and the connecting head to conduct the first sensing air chamber and the air duct.

[0014] Optionally, the connector is provided with a third connecting column, the mounting seat is provided with a fourth connecting column, and both ends of the flexible tube are respectively sleeved on the third connecting column and the fourth connecting column.

[0015] Optionally, the first waterproof tube utilizes the surface tension principle of water to form a water column in the first waterproof tube when water enters to prevent external water from further invading the air pressure sensor through the first waterproof tube.

[0016] Optionally, the inner diameter of the first waterproof tube is 1.5-3.5 mm.

[0017] Optionally, the inner diameter of the airway tube is 5-12 mm.

[0018] Optionally, the air pressure sensor includes a sensor body, a sensor tube is provided on one side of the sensor body; the first sensitive element is arranged in the sensor tube; the connector is provided with a sensing connection hole connected to the first sensing air chamber, and the sensor tube is inserted into the sensing connection hole, so that the first sensitive element can sense the internal air pressure of the first sensing air chamber.

[0019] Optionally, a sealing ring is provided in the sensing connection hole, and the sensor tube is inserted into the sealing ring.

[0020] Optionally, the air pressure sensor further includes a second sensitive element for sensing atmospheric pressure.

[0021] Optionally, a shell cover is included, which is installed on the connector and covers the air pressure sensor.

[0022] Optionally, the air pressure level gauge is used in a liquid medicine tank for plant protection.

[0023] On the other hand, a liquid storage device is provided, comprising a liquid storage tank and the above-mentioned air pressure level gauge.

[0024] On the other hand, a plant protection equipment is provided, comprising a carrier, a spraying system and the above-mentioned liquid storage device, wherein the spraying system and the liquid storage device are installed on the carrier, and the spraying system is used to pump out the liquid in the liquid storage device and perform atomized spraying.

[0025] The beneficial effects of the present application are as follows: the utility model provides an air pressure level gauge, a liquid storage device and a plant protection equipment. In the air pressure level gauge, a first waterproof tube is provided for connecting the air duct and the air pressure sensor. Under normal circumstances, the air duct and the air pressure sensor can be connected through the first waterproof tube, so that the air pressure sensor can normally sense the air pressure of the air duct and realize the function of liquid level detection; in addition, the air pressure sensor can also be waterproofed through the first waterproof tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present application is further described in detail below with reference to the accompanying drawings and examples.

[0027] Figure 1 This is a schematic structural diagram of one embodiment of the air pressure level gauge described in the embodiments of the present application;

[0028] Figure 2 for Figure 1 A vertical sectional view of the air pressure level gauge shown;

[0029] Figure 3 for Figure 1 The exploded diagram of the air pressure level gauge shown is in a state where the air guide tube is hidden;

[0030] Figure 4 for Figure 1 A vertical cross-sectional view of the air pressure level gauge with the air guide tube hidden is shown;

[0031] Figure 5 for Figure 4 Enlarged view of area A in the middle;

[0032] Figure 6 for Figure 4 Enlarged view of area B in the middle;

[0033] Figure 7 This is a schematic structural diagram of the housing base from a top side perspective according to an embodiment of the present application;

[0034] Figure 8 This is a schematic structural diagram of the bottom side perspective of the housing base according to an embodiment of the present application;

[0035] Figure 9 This is a structural diagram of the housing base and the second waterproof pipe in a connected state according to an embodiment of the present application;

[0036] Figure 10 This is a schematic structural diagram of the upper cover of the shell according to an embodiment of the present application;

[0037] Figure 11 This is a structural diagram of another embodiment of the air pressure level gauge described in the embodiment of the present application;

[0038] Figure 12 for Figure 11 A vertical sectional view of the air pressure level gauge shown;

[0039] Figure 13 This is a vertical cross-sectional view of another embodiment of the shell of the air pressure level gauge described in the embodiment of the present application.

[0040] In the picture:

[0041] 1. Housing; 11. Housing base; 111. Support boss; 112. Airtight groove; 113. Airtight ring; 1131. Convex rib; 114. Pipe clamp; 1141. Curved pipe clamp plate; 1142. Clamping block; 12. Housing cover; 13. Side surrounding wall; 131. Second surrounding wall plate; 132. First surrounding wall plate; 1321. Second surrounding wall portion; 1322. First surrounding wall portion; 1323. Step portion; 1324. Annular groove; 1325. Waterproof ring; 14. Top cover; 15. Inner partition; 151. Annular flange; 16. Device mounting cavity; 161. Second sensing air chamber; 1611. Sensor installation area; 1612. Bypass narrow air channel; 17. Breathing chamber; 18. Second air vent; 19. First air vent; 2. Connector; 21. Mounting seat; 211. First sensing air chamber; 22. Connector; 221. Second connecting column; 222. First connecting column; 223. Air channel; 23. Flexible tube; 3. Air pressure sensor; 31. Sensor body; 32. Sensor tube; 33. Sealing ring; 4. First waterproof tube; 5. Air guide tube; 6. Second waterproof tube; 7. Main control circuit board. DETAILED DESCRIPTION

[0042] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0043] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0044] In this application, unless otherwise expressly specified or limited, a second feature being "above" or "below" a first feature may include the second and first features being in direct contact, or may include the second and first features being in contact not directly but through another feature between them. Moreover, a second feature being "above," "above," and "above" a first feature may include the second feature being directly above or obliquely above the first feature, or may simply mean that the second feature is higher in level than the first feature. A second feature being "below," "below," and "below" a first feature may include the second feature being directly below or obliquely below the first feature, or may simply mean that the second feature is lower in level than the first feature.

[0045] In the field of plant protection, automatic pesticide spraying equipment is usually integrated with a barometric level gauge. The main body of the barometric level gauge is generally installed on the top of the liquid medicine tank, with an air pressure sensor 3 integrated inside. A vent pipe connected to the air pressure sensor 3 is provided, and the vent pipe extends to the bottom of the liquid medicine tank. The barometric level gauge can be used to automatically monitor the height of the liquid medicine in the liquid medicine tank in real time. Under normal circumstances, since the barometric level gauge is located at the top of the liquid medicine tank, the liquid medicine in the liquid medicine tank cannot flow back through the vent pipe and contact the barometric level gauge. In addition, in order to meet normal ventilation needs, the air pressure sensor 3 cannot be isolated and sealed from the vent pipe. Therefore, the existing air pressure sensor 3 is generally exposed to the air connected to the vent pipe. This leads to the problem that when the liquid medicine tank accidentally topples or even turns upside down, the liquid medicine can easily flow back through the vent pipe and contact the air pressure sensor 3, which in turn causes water to enter the air pressure sensor 3 and damage it. Therefore, in the existing barometric level gauge, there is a risk of water entering the side where the air pressure sensor 3 is connected to the vent pipe.

[0046] In order to overcome the above technical problems, this embodiment provides a barometric level gauge that can meet the requirement of the barometric pressure sensor 3 to sense the gas pressure on the liquid side, while also providing a reliable waterproof function in an emergency to provide reliable protection for the barometric pressure sensor 3.

[0047] The barometric level gauge of this embodiment includes at least an air pressure sensor 3, a first waterproof tube 4 and an air guide tube 5; the first waterproof tube 4 is connected to the air pressure sensor 3; the inner diameter of the air guide tube 5 is larger than the inner diameter of the first waterproof tube 4, one end of the air guide tube 5 is connected to the air pressure sensor 3 through the first waterproof tube 4, and the other end is used to extend into the liquid to sense the water pressure.

[0048] The barometric level gauge of this embodiment uses the principle of air pressure detection to realize the function of detecting the liquid level height. In specific application, the end of the air duct 5 away from the first waterproof tube 4 extends into the liquid, and the air pressure sensor 3, the first waterproof tube 4, the air duct 5 and the liquid form a closed cavity. The liquid applies pressure to the air in the cavity. The air pressure sensor 3 detects the air pressure of this part of the air. The higher the liquid level, the greater the pressure applied by the liquid to the air in the cavity, and the higher the air pressure value detected by the air pressure sensor 3. That is, the air pressure value detected by the air pressure sensor 3 can be converted into the liquid level.

[0049] In one embodiment, the waterproof principle of the first waterproof tube 4 is similar to that of a capillary tube. When external liquid enters the first waterproof tube 4 through the end of the first waterproof tube 4 away from the air pressure sensor 3, the liquid easily forms a water column in the first waterproof tube 4 under the action of liquid tension. The water column can isolate the space between the air pressure sensor 3 and the first waterproof tube 4 from the outside world, which is equivalent to forming a blockage, preventing the air between the air pressure sensor 3 and the first waterproof tube 4 from being discharged. When the pressure of the external liquid is balanced with the air pressure in the first waterproof tube 4, the liquid can no longer enter, thereby achieving the purpose of waterproofing the air pressure sensor 3.

[0050] It should be noted that, in normal use, the end of the first waterproof tube 4 connected to the air duct 5 does not extend into the liquid. This is because the waterproofing principle of the first waterproof tube 4 is achieved by utilizing the tension of the liquid itself. When liquid enters the first waterproof tube 4, it easily forms a water column within the first waterproof tube 4. This water column is difficult to dissipate freely under its own gravity, and the height of the water column is not easy to change. As a result, the air pressure within the first waterproof tube 4 does not accurately reflect the pressure exerted by the liquid. In other words, the air pressure value sensed by the air pressure sensor 3 does not sensitively reflect the liquid level, which directly leads to the failure of the liquid level meter. Therefore, the air duct 5 in this application plays a crucial role as an intermediate bridge connecting the first waterproof tube 4 and the liquid. The large inner diameter of the air duct 5 makes it difficult for a water column to form in the air duct 5 due to the tension of the liquid itself. When the liquid level changes, the liquid level within the air duct 5 also changes sensitively. Therefore, the air pressure within the air duct 5 can accurately reflect the liquid pressure. Since the first waterproof tube 4 is connected to the air duct 5, the air pressure within the first waterproof tube 4 can also accurately reflect the liquid pressure. In summary, in this embodiment, in addition to providing a first waterproof tube 4 to ensure air permeability and waterproofing for the air pressure sensor 3, an air guide tube 5 is also provided to extend into the liquid, so that the first waterproof tube 4 will never come into contact with water under normal use, thereby avoiding the problem of the first waterproof tube 4 affecting the liquid level detection accuracy after water enters the first waterproof tube 4.

[0051] In specific applications, the air pressure sensor 3 used in the barometric liquid level gauge can be either an absolute or relative pressure sensor 3 , depending on the intended use. When using an absolute pressure sensor 3 , only one sensitive element is provided, which senses the air pressure within the first waterproof tube 4 . When using a relative pressure sensor 3 , two sensitive elements are provided: one sensitive element senses the air pressure within the first waterproof tube 4 , and the other senses atmospheric pressure. The pressure difference detected by the two sensitive elements accurately reflects the actual liquid level, preventing changes in atmospheric pressure from affecting liquid level detection.

[0052] In summary, based on the barometric level gauge of this embodiment, a first waterproof tube 4 is provided in the barometric level gauge for connecting the air duct 5 and the air pressure sensor 3. Under normal circumstances, the air duct 5 and the air pressure sensor 3 can be connected through the first waterproof tube 4, so that the air pressure sensor 3 can normally sense the air pressure of the air duct 5 and realize the function of liquid level detection; the waterproof principle of the first waterproof tube 4 is similar to that of a capillary tube. When external liquid enters the air pressure sensor 3 through the end of the first waterproof tube 4 away from the air pressure sensor 3, the liquid easily forms a water column in the first waterproof tube 4 under the action of liquid tension. The water column can isolate the space between the air pressure sensor 3 and the first waterproof tube 4 from the outside world, which is equivalent to forming a blockage, preventing the air between the air pressure sensor 3 and the first waterproof tube 4 from being discharged. When the pressure of the external liquid is balanced with the air pressure in the first waterproof tube 4, the liquid cannot continue to enter, thereby achieving the purpose of waterproofing the air pressure sensor 3.

[0053] The barometric level gauge of this embodiment can be used in various scenarios where liquid level detection is required, including but not limited to industrial facilities such as reactors and filter tanks; household appliances such as washing machines and dishwashers; and plant protection equipment such as agricultural liquid tanks and water tanks.

[0054] The advantages of the barometric level gauge of this embodiment are more evident in the application scenario of agricultural plant protection liquid tanks. The liquid tank needs to be continuously moved in the farmland, so it is generally mounted on an unmanned vehicle, drone, or manually driven vehicle, or directly carried and moved by people. That is, the liquid tank is a structure that is easy to move and transfer. During use, the liquid tank is prone to tipping over, which in turn causes the liquid to be diverted and contaminate the barometric pressure sensor 3. In addition, the liquid medicine itself is corrosive, which can easily damage the barometric pressure sensor 3. The design of the first waterproof tube 4 of this solution can effectively prevent the problem of water intrusion into the barometric pressure sensor 3 when the liquid tank tips over. Therefore, the advantages of the barometric level gauge of this solution in the application scenario of agricultural plant protection liquid tanks are more apparent.

[0055] When the inventors of this application initially considered waterproofing the air pressure sensor 3 of the liquid level gauge, they immediately came up with the idea of ​​installing a waterproof breathable valve between the air pressure sensor 3 and the air guide tube 5. The waterproof breathable valve is breathable but not water-permeable, which just meets the requirements for breathability and waterproofing. However, in actual use, the inventors found that when the breathable membrane inside the waterproof breathable valve becomes wet, the entire waterproof breathable valve needs to be disassembled, the breathable membrane needs to be dried, and then reassembled, which is a relatively complicated drainage process. More importantly, because the breathable membrane inside the waterproof breathable valve cannot be directly seen from the outside, users often cannot determine whether the breathable membrane is wet. During use, they often need to disassemble the waterproof breathable valve and inspect the breathable membrane, which imposes a certain burden on users. After many experiments and research and development, the inventor of this application creatively designed a breathable and waterproof structure with a first waterproof tube 4 in the embodiment of this application. The first waterproof tube 4 is a transparent tube. Before use, the user can intuitively observe whether water has entered the first waterproof tube 4. When water is found to have entered, the water can be drained out by shaking or flicking the first waterproof tube 4. Compared with the method of using a waterproof breathable valve for waterproofing, the first waterproof tube 4 of this solution is more user-friendly.

[0056] In one embodiment, referring to Figure 2 and Figure 4 The air pressure sensor 3 also includes a connector 2, and a first sensing air chamber 211 is provided inside the connector 2; the air pressure sensor 3 includes a first sensitive element for sensing the air pressure inside the first sensing air chamber 211, and the first waterproof tube 4 is connected to the connector 2 and communicates with the first sensing air chamber 211.

[0057] Specifically, connector 2 provides mounting support for air pressure sensor 3, enabling an indirect connection between air pressure sensor 3 and first waterproof tube 4. Importantly, connector 2 houses a sealed first sensing chamber 211, isolated from external connections and connected to first waterproof tube 4 and air duct 5. The air pressure within first air pressure sensor 3 accurately reflects the pressure exerted by the liquid, enabling precise liquid level detection. In short, connector 2 provides a reliable bridge between air pressure sensor 3 and first waterproof tube 4, effectively ensuring the airtightness of the connection structure.

[0058] In specific implementation, the air pressure sensor 3 can be completely or partially installed in the first sensing air chamber 211; the air pressure sensor 3 can also be installed on the outer surface of the connector 2 (that is, the air pressure sensor 3 does not extend into the first sensing air chamber 211), as long as the first sensitive element thereon can be aligned toward the first sensing air chamber 211.

[0059] In another embodiment, the air pressure sensor 3 includes a sensor body 31 and a sensor tube 32, and the first sensitive element is aligned with the lumen of the sensor tube 32; the end of the first waterproof tube 4 is directly connected to the sensor tube 32, so that the first sensitive element can accurately sense the air pressure in the first waterproof tube 4.

[0060] Regarding the connection arrangement of the first waterproof tube 4 and the air guide tube 5, in one embodiment, refer to Figure 2 or Figure 12 The connector 2 includes a connecting head 22, which includes a first connecting column 222 and a second connecting column 221 connected to each other. An air duct 223 is provided in the connecting head 22, which passes through the first connecting column 222 and the second connecting column 221. The air duct 223 is connected to the first sensing air chamber 211; the first waterproof tube 4 is connected to the second connecting column 221, and the air guide tube 5 is sleeved on the outside of the first waterproof tube 4 and connected to the first connecting column 222.

[0061] In this embodiment, the connector 22 is provided with a first connecting post 222 and a second connecting post 221, which are respectively used to connect the air duct 5 and the first waterproof tube 4. Therefore, the diameter of the first connecting post 222 needs to correspond to the air duct 5, and the diameter of the second connecting post 221 needs to correspond to the first waterproof tube 4. The key to this structure is that it forms a sleeve structure for the air duct 5 and the first waterproof tube 4, that is, the first waterproof tube 4 extends into the air duct 5. When the barometric level gauge is inverted, liquid will first fill the space between the first waterproof tube 4 and the air duct 5. Only when the liquid level exceeds the height of the free end of the first waterproof tube 4 can the liquid enter the first waterproof tube 4. The application advantage of this in the plant protection liquid tank is extremely obvious. Specifically, the liquid tank cannot usually be completely emptied after use, and a small amount of liquid will remain in the liquid tank. Moreover, the liquid tank after use is light in weight and is prone to tipping or inversion. When tipping or inverting, a small amount of liquid can easily enter through the free end of the air guide tube 5. After entering, the small amount of liquid will remain in the space between the first waterproof tube 4 and the air guide tube 5. This can avoid the problem of water entering the first waterproof tube 4. If water does not enter the first waterproof tube 4, the user does not need to remove it for drainage during later use, which is convenient for the user.

[0062] In one embodiment, the first waterproof tube 4 is sleeved on the second connecting column 221 ; and / or the air guide tube 5 is sleeved on the first connecting column 222 .

[0063] The sleeve connection structure is adopted to further enhance the sealing and stability of the connection between the pipe and the connector 2.

[0064] Preferably, the first connecting column 222 and the second connecting column 221 are both configured as pagoda connectors 22 to improve the reliability of the connection.

[0065] Regarding the configuration of the connector 2, in one embodiment, refer to Figure 11-12 The connector 2 includes a mounting base 21 and a connecting head 22 . The first sensing chamber 211 is disposed on the mounting base 21 . The connecting head 22 and the mounting base 21 are an integrated structure.

[0066] The mounting base 21 can be used to mount the air pressure sensor 3, so that the air pressure sensor 3 is stably mounted. The first sensing chamber 211 is disposed on the mounting base 21. After the air pressure sensor 3 is mounted, the first sensitive element thereon can be aligned toward the first sensing chamber 211.

[0067] During implementation, the mounting base 21 can also be configured to mount a pneumatic device (such as the main control circuit board 7, etc.). In addition, the mounting base 21 can also be configured to be capable of being connected to the liquid medicine tank, so that the air pressure level gauge of this embodiment can be reliably mounted on the liquid medicine tank.

[0068] By designing the mounting base 21 and the connector 22 as an integrated structure, the overall structural strength of the connector 2 is significantly improved. This design can withstand greater external forces and vibrations, ensuring the stability and reliability of the connector 2 under harsh working conditions. The integrated structure simplifies the manufacturing process of the connector 2. During the manufacturing process, the processing and assembly of the mounting base 21 and the connector 22 can be completed in one step, reducing production costs and improving production efficiency. Because there is no additional connection gap between the mounting base 21 and the connector 22, the risk of leakage due to poor connection is reduced. This design helps to ensure the airtightness of the interior of the connector 2 and the accuracy of air pressure transmission.

[0069] Regarding the configuration of the connector 2, in another embodiment, refer to Figure 1-2 The connector 2 includes a mounting seat 21, a flexible tube 23 and the connecting head 22. The first sensing air chamber 211 is set on the mounting seat 21. The two ends of the flexible tube 23 are respectively connected to the mounting seat 21 and the connecting head 22 to conduct the first sensing air chamber 211 and the air duct 223.

[0070] The connector 2 adopts an innovative design including a mounting base 21, a flexible tube 23 and a connecting head 22. The flexible tube 23 is a key component connecting the mounting base 21 and the connecting head 22. It not only realizes the conduction between the first sensing air chamber 211 and the air duct 223, but also gives the connector 2 unique maintenance convenience.

[0071] The mounting base 21 can be used to mount the air pressure sensor 3, ensuring stable installation of the air pressure sensor 3. The first sensing chamber 211 is provided on the mounting base 21. After the air pressure sensor 3 is installed, the first sensitive element thereon can be aligned with the first sensing chamber 211. The two ends of the flexible tube 23 are respectively connected to the mounting base 21 and the connector 22, ensuring smooth conduction between the first sensing chamber 211 and the air duct 223. This allows the air pressure to pass unimpeded from the air duct 5 through the connector 22 and the flexible tube 23, and finally reach the first sensing chamber 211, where it is accurately sensed by the air pressure sensor 3. When water enters the first waterproof tube 4, the traditional connector 2 may need to disassemble multiple components for drainage. However, in this embodiment, due to the presence of the flexible tube 23, the user can directly squeeze the flexible tube 23 to use air pressure to squeeze out the water column in the first waterproof tube 4, thereby quickly restoring the normal use function of the connector 2. This design greatly simplifies the maintenance process and improves the user's operational convenience.

[0072] In one embodiment, the connector 22 is provided with a third connecting post, the mounting base 21 is provided with a fourth connecting post, and both ends of the flexible tube 23 are respectively sleeved on the third connecting post and the fourth connecting post.

[0073] The sleeve connection structure further enhances the sealing and stability of the connection between the flexible tube 23 and the mounting seats 21 at both ends and the connector 22 .

[0074] In one embodiment, the first waterproof tube 4 utilizes the surface tension of water to form a water column in the first waterproof tube 4 when water enters, thereby preventing external water from further passing through the first waterproof tube 4 and invading the air pressure sensor 3 .

[0075] Specifically, the waterproof function of the first waterproof tube 4 is achieved by utilizing the principle of liquid surface tension. It is only necessary to set the inner diameter of the first waterproof tube 4 to be small enough so that a water column can be formed therein when water enters. The first waterproof tube 4 of this structure has the advantages of simple structure and low cost.

[0076] In one embodiment, the inner diameter of the first waterproof tube 4 is 1.5-3.5 mm.

[0077] Setting the inner diameter of the first waterproof tube 4 to 1.5-3.5 mm can meet normal ventilation requirements, and at the same time can utilize the surface tension of the liquid to form a water column in the first waterproof tube 4 to achieve the waterproof function.

[0078] Further preferably, the inner diameter of the first waterproof tube 4 is 2.5-2.7 mm. This small size range can provide a sufficiently stable ventilation function and can ensure that a water column is stably formed when water enters.

[0079] In one embodiment, the inner diameter of the air guide tube 5 is 5-12 mm.

[0080] The inner diameter of the air guide tube 5 is set at 5-12 mm, which can ensure the response speed of the air pressure, so that the air pressure sensor 3 can sense the air pressure change more timely, thereby improving the accuracy and real-time performance of the measurement.

[0081] In one embodiment, combining Figure 4-Figure 5 The air pressure sensor 3 includes a sensor body 31, and a sensor tube 32 is provided on one side of the sensor body 31; the first sensitive element is arranged in the sensor tube 32; the connector 2 is provided with a sensing connection hole connected to the first sensing air chamber 211, and the sensor tube 32 is inserted into the sensing connection hole, so that the first sensitive element can sense the internal air pressure of the first sensing air chamber 211.

[0082] The specially designed sensing connection hole on the connector 2 serves as a bridge connecting the first sensing air chamber 211 and the sensor cannula 32. The sensor cannula 32 is connected to the sensing connection hole by plugging. This connection method is not only simple and fast, but also ensures the sealing and reliability of the connection. After plugging, the first sensitive element can directly face the interior of the first sensing air chamber 211 and sense the air pressure changes inside the first sensing air chamber 211.

[0083] In one embodiment, a sealing ring 33 is provided in the sensing connection hole, and the sensor tube 32 is inserted into the sealing ring 33 .

[0084] The sealing ring 33 is placed in the sensing connection hole. When the sensor tube 32 is inserted, the sealing ring 33 will be tightly compressed between the tube and the connection hole, forming an effective sealing barrier. This sealing effect effectively ensures the airtightness of the first sensing air chamber 211, so that the air pressure in the first sensing air chamber 211 can accurately reflect the liquid pressure, thereby ensuring the accuracy of liquid level detection.

[0085] In one embodiment, the air pressure sensor 3 further includes a second sensitive element for sensing atmospheric pressure.

[0086] That is, the air pressure sensor 3 is a relative sensor, and when the atmospheric pressure changes, it can also achieve the purpose of accurately detecting the liquid level height.

[0087] In one embodiment, the air pressure level gauge includes a housing cover 12 , which is mounted on the connector 2 and covers the air pressure sensor 3 .

[0088] Specifically, the main function of the shell cover 12 is to protect the air pressure sensor 3 from the influence of the external environment. It is installed on the connector 2 and forms a space to isolate the air pressure sensor 3 from possible dust, moisture, corrosive gases, etc., thereby extending the service life of the air pressure sensor 3 and improving its measurement accuracy.

[0089] In addition, the sealed space between the shell cover 12 and the connector 2 can also be used to install components such as the main control circuit board 7 required for the air pressure level gauge, which also serves the function of isolation and protection.

[0090] On the other hand, this embodiment also provides a liquid storage device, including a liquid storage tank and the above-mentioned barometric level gauge, wherein the connector 2 of the barometric level gauge is installed on the top of the liquid storage tank, and the air guide tube 5 of the barometric level gauge extends from one end away from the connector 2 to the bottom of the liquid storage tank.

[0091] Similarly, the air pressure level gauge in the liquid storage device of this embodiment has the advantage of good waterproof capability.

[0092] On the other hand, a plant protection equipment is provided, comprising a carrier, a spraying system and the above-mentioned liquid storage device, wherein the spraying system and the liquid storage device are installed on the carrier, and the spraying system is used to pump out the liquid in the liquid storage device and perform atomized spraying.

[0093] Among them, the vehicle can be an unmanned vehicle, a drone, a manually driven vehicle, etc.

[0094] The spraying system consists of a pumping device and an atomizer. Pipes at both ends of the pumping device connect to the liquid storage tank and the atomizer, respectively. The pumping device pumps the liquid from the storage tank, which is then atomized by the atomizer and evenly sprayed on the crops. Mobile spraying operations can be achieved by using a vehicle.

[0095] Based on the liquid storage device of this embodiment, similarly, the air pressure level gauge in the plant protection equipment of this embodiment has the advantages of strong waterproof ability and long service life.

[0096] In order to ensure the detection accuracy, the air pressure sensor 3 in the existing air pressure level gauge installed on the liquid tank is generally a relative air pressure sensor 3. The relative air pressure sensor 3 has at least two air pressure detection points, one of which is used to detect the air pressure in the vent pipe, and the other is used to detect the atmospheric pressure. By obtaining the difference between the internal and external air pressures and converting it into the liquid level height, the problem of atmospheric pressure changes affecting the liquid level detection accuracy can be avoided. Since the air pressure sensor 3 needs to be connected to the atmosphere to detect the atmospheric pressure, it is impossible to install the air pressure sensor 3 in an absolutely sealed environment. It is usually necessary to set an air vent on the shell 1 of the liquid level gauge to maintain connection with the atmosphere. Since the working environment of equipment in the field of agricultural plant protection is generally an outdoor environment, rainwater, river water, and cleaning water that are usually exposed to it can easily invade the interior of the liquid level gauge through the air vent, which leads to the problem that the internal air pressure sensor 3 and the circuit board of the existing liquid level gauge are easily damaged by water.

[0097] In order to overcome the above technical problems, refer to Figure 4 or Figure 13 This embodiment also provides another barometric level gauge that effectively prevents splashing water, such as rainwater or washing water, from entering the gauge and potentially damaging the internal electronic components. It should be noted that this embodiment of the barometric level gauge can be combined with the design features of any one or more of the aforementioned embodiments.

[0098] The barometric level gauge of this embodiment includes an outer shell 1 and an air pressure sensor. The outer shell 1 includes a side wall 13 and a top cover plate 14 and an inner partition plate 15 respectively connected to the side wall 13. A device installation cavity 16 is enclosed between the top cover plate 14 and the inner partition plate 15, and an air permeable chamber 17 is formed on the side of the inner partition plate 15 facing away from the top cover plate 14; the air permeable chamber 17 is connected to the atmosphere, and the inner partition plate 15 is provided with a second air permeable hole 18 connecting the device installation cavity 16 and the air permeable chamber 17, so that the device installation cavity 16 can be ventilated to the atmosphere; the air pressure sensor is installed in the device installation cavity 16, and the air pressure sensor includes a second sensitive element for sensing the air pressure in the device installation cavity 16.

[0099] Specifically, the side walls 13, top cover plate 14 and inner partition plate 15 provided by the outer shell 1 can just enclose to form an independent device installation cavity 16. The air pressure sensor and the required main control circuit board 7 can be installed in the device installation cavity 16, and the outer shell 1 provides reliable protection to achieve waterproof, dustproof and other functions.

[0100] In this solution, a second air vent 18 is provided on the inner partition 15, and the air vent chamber 17 below the inner partition 15 is provided to be connected to the atmosphere, thereby achieving the purpose of connecting the device installation cavity 16 with the atmosphere, so that the air pressure sensor in the device installation cavity 16 can normally sense the atmospheric pressure.

[0101] The barometric level gauge of this embodiment can be used in various scenarios where liquid level detection is required. Taking the application of the barometric level gauge of this embodiment to a plant protection medicine tank as an example, during installation, the outer shell 1 is fixed to the top of the medicine tank, that is, the bottom edge of the side wall 13 needs to contact the medicine tank for installation. At this time, the side wall 13, the inner partition 15 and the medicine tank just enclose to form the above-mentioned air chamber 17. In order to achieve the connection between the air chamber 17 and the atmosphere, a hole can be set in the side wall 13, or a hole or slot connected to the air chamber 17 can be set on the medicine tank.

[0102] It can be understood that after the barometric level gauge of this embodiment is installed, the inner partition 15 is located above the air chamber 17, that is, the second air hole 18 provided on the inner partition 15 is also located above the air chamber 17. When rain, cleaning, etc. occur, even if splashing water enters the air chamber 17 through the side wall 13 or the holes, grooves, etc. on the medicine tank that connect to the air chamber 17, it is difficult to splash upward in the air chamber 17 and enter the device installation cavity 16 through the second air hole 18.

[0103] In summary, based on the barometric level gauge of this embodiment, an inner partition 15 separated from the top cover plate 14 is provided in the side wall 13, so that a device installation cavity 16 is formed between the top cover plate 14 and the inner partition 15, and an air permeable chamber 17 is formed below the inner partition 15. At the same time, a second air permeable hole 18 is provided in the inner partition 15, so that the device installation cavity 16 can be ventilated with the atmosphere through the air permeable chamber 17, so that the air pressure sensor in the device installation cavity 16 can sense the atmospheric pressure. When this solution is used, when rain or splashing of cleaning water occurs, even if a small amount of water splashes into the air permeable chamber 17, this part of the water does not have enough kinetic energy to impact upwards and pass through the second air permeable hole 18 into the device installation cavity 16. Therefore, this solution can provide effective splash-proof protection for the devices (such as circuit boards, air pressure sensors 3, etc.) installed in the device installation cavity 16, avoiding the problem of internal devices being damaged by water.

[0104] The barometric level gauge of this embodiment can be used in various scenarios where liquid level detection is required, including but not limited to industrial facilities such as reactors and filter tanks; household appliances such as washing machines and dishwashers; and plant protection equipment such as agricultural liquid tanks and water tanks.

[0105] The advantage of the barometric level gauge of this embodiment in applications where agricultural plant protection liquid tanks are used is more obvious, because the plant protection liquid tanks are used outdoors and are inevitably exposed to rain. Moreover, users often need to clean the barometric level gauge after use. The waterproof structure of this embodiment can just meet the needs of the plant protection liquid tanks that often need to deal with various water splashing scenarios.

[0106] In one embodiment, combining Figure 4 and Figure 9 A second waterproof tube 6 is provided in the ventilation chamber 17, one end of the second waterproof tube 6 is connected to the second ventilation hole 18, and the other end is a free end, so that the device installation cavity 16 is ventilated with the ventilation chamber 17 through the second waterproof tube 6.

[0107] Under normal conditions, the second waterproof tube 6 connects the device mounting cavity 16 with the vent chamber 17, ensuring connectivity between the device mounting cavity 16 and the atmosphere. When exposed to water, the second waterproof tube 6 effectively provides waterproofing. The waterproofing principle of the second waterproof tube 6 is similar to that of a capillary tube. When external liquid enters the second waterproof tube 6 through the end of the second waterproof tube 6 away from the device mounting cavity 16, the liquid easily forms a water column within the second waterproof tube 6 due to liquid tension. This water column isolates the space between the device mounting cavity 16 and the second waterproof tube 6 from the outside world, effectively forming a seal that prevents air from escaping between the air pressure sensor 3 and the second waterproof tube 6. Once the external liquid pressure balances with the air pressure within the second waterproof tube 6, further liquid cannot enter, thereby achieving waterproofing of the air pressure sensor 3.

[0108] It should be noted that the purpose of setting the second waterproof tube 6 in this embodiment is to provide a safety waterproof function. During normal use, external splashing water cannot enter the second waterproof tube 6. When encountering a water immersion situation, based on the setting of the second waterproof tube 6, external water can be prevented from entering the device installation cavity 16 through the second waterproof tube 6, so that normal waterproof function can be provided even in the case of water immersion. The advantages of the barometric pressure level gauge with the second waterproof tube 6 are particularly obvious in the application of automatic spraying equipment carried by drones, because the barometric pressure level gauge of this solution can achieve an effective waterproof function even if the entire barometric pressure level gauge is immersed in water. When the drone is equipped with an automatic spraying equipment for plant protection work, if the drone accidentally falls while flying over the water, the drone and the medicine box will fall into the water, and water can also be prevented from entering the barometric pressure level gauge.

[0109] In addition, when the second waterproof tube 6 of the barometric level gauge is blocked by water, the water in the second waterproof tube 6 can be shaken out by shaking or knocking, and the gauge can be restored to use.

[0110] When the inventors of this application initially considered waterproofing the air pressure sensor 3 of the liquid level gauge, they immediately came up with the idea of ​​installing a waterproof vent valve in the vent opening of the housing. This vent valve is air-permeable but water-tight, precisely meeting the requirements for breathability and waterproofing. However, in actual use, the inventors discovered that when the vent membrane inside the waterproof vent valve becomes wet, the entire valve needs to be disassembled, dried, and then reassembled, making the drainage process more complicated. More importantly, because the vent membrane inside the waterproof vent valve cannot be directly seen from the outside, users often cannot determine whether the vent membrane is wet. During use, they often need to disassemble the waterproof vent valve and inspect the vent membrane, which places a certain burden on users. After many experiments and research and development, the inventor of this application creatively designed a breathable and waterproof structure with a second waterproof tube 6 in the embodiment of this application. The second waterproof tube 6 is a transparent tube. Before use, the user can intuitively observe whether water has entered the second waterproof tube 6. When water is found to have entered, the water can be drained out by shaking or flicking the second waterproof tube 6. Compared with the method of using a waterproof breathable valve for waterproofing, the second waterproof tube 6 of this solution is more user-friendly.

[0111] In one embodiment, the second waterproof tube 6 includes a second waterproof tube 6 body and a vent joint that are connected to each other, and the vent joint is plugged and connected to the second vent hole 18 .

[0112] The second waterproof tube 6 is split into two parts: the main body and the vent connector, achieving a modular design. This allows for more flexible handling of different components during production, installation, and maintenance, improving overall work efficiency and convenience. The vent connector connects to the second vent 18 using a plug-in connection. This connection is not only simple and quick, but also ensures a tight and stable connection. The plug-in connection also facilitates disassembly, maintenance, and replacement when necessary, reducing maintenance costs.

[0113] In one embodiment, a flexible tube 23 is connected between the main body of the second waterproof tube 6 and the vent joint, and the inner diameter of the flexible tube 23 is larger than the inner diameter of the main body of the second waterproof tube 6 .

[0114] The provision of the flexible tube 23 gives the second waterproof tube 6 unique maintenance convenience. Specifically, when water enters the second waterproof tube 6, due to the presence of the flexible tube 23, the user can directly squeeze the flexible tube 23 and use air pressure to squeeze out the water column in the second waterproof tube 6, thereby quickly restoring the normal use function of the barometric level gauge. This design greatly simplifies the maintenance process and improves the user's operating convenience.

[0115] In one embodiment, combining Figure 8 and Figure 9A pipe clamping member 114 is provided on the side of the inner partition 15 facing away from the top cover plate 14 , and the second waterproof tube 6 is clamped on the pipe clamping member 114 .

[0116] The design of the pipe clamp 114 enables the second waterproof pipe 6 to be firmly fixed on the inner partition 15, avoiding loosening or falling off due to external factors such as vibration and impact. This stable connection ensures the reliability of the second waterproof pipe 6 during long-term use and prevents water or air leakage caused by unstable connection.

[0117] In one embodiment, the inner partition plate 15 is provided with a connector 2 protruding away from the top cover plate 14 and used for connecting to the air guide tube 5 , and the second waterproof tube 6 is coiled around the connector 2 .

[0118] Specifically, the air pressure sensor 3 of this embodiment adopts a relative air pressure sensor 3, which has at least a second sensitive element and a first sensitive element. The second sensitive element is used to sense the atmospheric pressure, and the first sensitive element is used to sense the pressure of the air chamber connected to the liquid. In order to enable the second sensitive element and the first sensitive element to perform their respective functions, in this embodiment, a connector 2 is provided on one side of the inner partition 15, and the connector 2 is connected to an air duct 5 that can extend into the liquid. A first sensing air chamber 211 connected to the air duct 5 is provided in the connector 2. After the air pressure sensor 3 is fixedly installed in the device installation cavity 16, the second sensitive element is located on the side of the device installation cavity 16, and the first sensitive element is facing the first sensing air chamber 211. After the air pressure sensor 3 is installed, the first sensing air chamber 211 and the device installation cavity 16 are separated. As long as the device installation cavity 16 is connected to the atmosphere, the second sensitive element can sense the atmospheric pressure and the first sensitive element can sense the air pressure on the liquid side. Preferably, refer to Figure 5 In order to effectively isolate the first sensing air chamber 211 from the device installation cavity 16, the air pressure sensor 3 includes a sensor body 31 and a sensor tube 32. The second sensitive element is located on the side of the sensor body 31, and the first sensitive element is aligned with the tube cavity of the sensor tube 32. A sealing ring 33 is provided at the position connecting the first sensing air chamber 211 in the device installation cavity 16, and the sensor tube 32 is inserted into the sealing ring 33. In this way, the first sensing air chamber 211 can be effectively isolated from the device installation cavity 16 based on the installation of the air pressure sensor 3 and the sealing ring 33.

[0119] When a flooding accident occurs, external water enters the second waterproof tube 6 and forms a water column within the second waterproof tube 6. The deeper the flooding, the greater the external water pressure, the greater the pressure exerted by the water column on the device mounting cavity 16, the longer the water column, and the greater the degree of compression of the gas in the device mounting cavity 16 by the water column. Therefore, the pressure increase in the device mounting cavity 16 is greater. When the air pressure in the device mounting cavity 16 reaches equilibrium with the external water pressure, the water column can no longer extend inward. Therefore, the length of the water column that can be formed in the second waterproof tube 6 determines the waterproof capability of the device mounting cavity 16. The longer the length of the water column that can be formed, the deeper the device mounting cavity 16 can remain waterproof, that is, the better deep water resistance is achieved. In this solution, the second waterproof tube 6 is arranged in a spiral shape around the connector 2, which can effectively utilize the limited space in the air permeable chamber 17 to fully arrange the second waterproof tube 6. Importantly, the spiral shape of the second waterproof tube 6 has the advantage of being long while occupying less space. This facilitates a longer second waterproof tube 6, which can achieve better deep water resistance.

[0120] In one embodiment, combining Figure 8 The pipe clamping member 114 includes an arc-shaped pipe clamping plate 1141, which is arranged on the side of the connector 2 facing away from the second air vent 18, and a second pipe clamping groove capable of clamping the second waterproof pipe 6 is formed between the arc-shaped pipe clamping plate 1141 and the connector 2.

[0121] Since the second waterproof tube 6 is typically cylindrical or tubular, the curved tube clamping plate 1141 is designed to better adapt to the shape of the second waterproof tube 6. It fits snugly, providing uniform clamping force and reducing the risk of bending in the middle of the second waterproof tube 6, which could hinder ventilation. Furthermore, the curved tube clamping plate 1141 utilizes the outer wall of the connector 2 to secure the second waterproof tube 6, simplifying the structure of the tube clamping member 114.

[0122] In one embodiment, the tube clamping member 114 includes a clamping block 1142 disposed near the second vent hole 18 , and the clamping block 1142 is provided with a first tube clamping groove capable of clamping the second waterproof tube 6 .

[0123] Specifically, the second waterproof tube 6 needs to be avoided near the second air vent 18, so a clamping block 1142 that takes up less space is provided to provide fixation, which not only meets the need to fix the second waterproof tube 6, but also avoids the problem of mutual squeezing caused by the waterproof tubes themselves.

[0124] In one embodiment, the second waterproof tube 6 utilizes the surface tension of water to form a water column in the second waterproof tube 6 when water enters, thereby preventing external water from further passing through the second waterproof tube 6 and invading the air pressure sensor 3 .

[0125] Specifically, the waterproof function of the second waterproof tube 6 is achieved by utilizing the principle of liquid surface tension. It is only necessary to set the inner diameter of the second waterproof tube 6 to be small enough so that a water column can be formed therein when water enters. The second waterproof tube 6 of this structure has the advantages of simple structure and low cost.

[0126] In one embodiment, the inner diameter of the second waterproof tube 6 is 1.5-3.5 mm.

[0127] Setting the inner diameter of the second waterproof tube 6 to 1.5-3.5 mm can meet normal ventilation requirements, and at the same time can utilize the surface tension of the liquid to form a water column in the second waterproof tube 6 to achieve the waterproof function.

[0128] Further preferably, the inner diameter of the second waterproof tube 6 is 2.5-2.7 mm. This small size range can provide a sufficiently stable ventilation function and can ensure that a water column is stably formed when water enters.

[0129] In one embodiment, referring to Figure 7-Figure 8 The side wall 13 is provided with a first air hole 19 connected to the air chamber 17, so that the air chamber 17 is connected to the atmosphere.

[0130] A first air vent 19 is provided on the side wall 13 to achieve ventilation, and corresponding holes or slots are not required on the medicine liquid tank on which it is installed. The air pressure level gauge of this embodiment can be directly applied to the existing medicine liquid tank and used normally without any improvement to the medicine liquid tank.

[0131] Regarding the configuration of the housing 1, in one embodiment, Figure 3 、 Figure 4 and Figure 6 The outer shell 1 includes a shell base 11 and a shell cover 12, the shell base 11 includes a connected second surrounding wall plate 131 and the inner partition 15; the shell cover 12 includes a connected first surrounding wall plate 132 and the top cover plate 14, the shell cover 12 is buckled on the shell base 11, the second surrounding wall plate 131 and the first surrounding wall plate 132 are connected to form the side surrounding wall 13, and the first air vent 19 is set on the second surrounding wall plate 131.

[0132] The housing 1 is divided into two modules: the housing base 11 and the housing cover 12. This design allows each component to be manufactured and processed separately before assembly. This modular design not only improves production efficiency but also facilitates subsequent maintenance and replacement. The housing cover 12 snaps onto the housing base 11, ensuring a tight connection between the two using appropriate fastening methods (such as clips, screws, etc.). This assembly method is not only simple and quick, but also ensures the sealing and stability of the housing 1.

[0133] In one embodiment, combining Figure 6and Figure 7 The inner partition 15 is protruded relative to the second surrounding wall plate 131 toward the side where the top cover plate 14 is located. The inner cavity of the first surrounding wall plate 132 corresponds to the outer dimensions of the inner partition 15, and the inner partition 15 is embedded in the first surrounding wall plate 132.

[0134] Because the inner partition 15 is embedded within the first enclosure panel 132, when the housing cover 12 is snapped onto the housing base 11, the first enclosure panel 132 automatically aligns and forms close contact with the second enclosure panel 131. This design simplifies the assembly process, reduces assembly precision requirements, and improves production efficiency. The inner partition 15 projects toward the side of the top cover panel 14 relative to the second enclosure panel 131 and is embedded within the first enclosure panel 132. This allows the inner partition 15 to serve as a positioning and fixing point between the housing cover 12 and the housing base 11 during assembly, enhancing the overall structural stability of the housing 1. Through the tight fit between the inner partition 15 and the first enclosure panel 132, and the contact between the inner partition 15 and the second enclosure panel 131, the housing 1 forms a continuous sealing barrier between the vent chamber 17 and the device mounting cavity 16. This sealing barrier effectively prevents liquid medicine or other impurities from infiltrating internal components, ensuring the proper operation and long-term stability of the barometric level gauge.

[0135] In one embodiment, combining Figure 6 The first surrounding wall plate 132 includes a second surrounding wall portion 1321 and a first surrounding wall portion 1322 connected in a stepped structure, and a step portion 1323 parallel to the inner partition 15 is formed between the second surrounding wall portion 1321 and the first surrounding wall portion 1322. A waterproof ring 1325 abutting the step portion 1323 is installed on the inner side of the second surrounding wall portion 1321, and the inner partition 15 is embedded in the second surrounding wall portion 1321 and abuts the waterproof ring 1325.

[0136] A waterproof ring 1325 is mounted inside the second surrounding wall 1321, tightly abutting the stepped portion 1323. The waterproof ring 1325 is typically made of a soft and elastic material, such as rubber or silicone, to ensure a good seal. The inner baffle 15 is embedded within the second surrounding wall 1321 and directly abuts the waterproof ring 1325. This design not only provides a secure support for the inner baffle 15, but also forms a tight seal with the outer shell 1 through the waterproof ring 1325, effectively preventing liquid or gas leakage through gaps in the outer shell 1.

[0137] In one embodiment, the step portion 1323 is provided with an annular groove 1324 , and the waterproof ring 1325 is embedded in the annular groove 1324 .

[0138] An annular groove 1324 is provided on step 1323, specifically designed to accommodate waterproof ring 1325. The shape and size of groove 1324 match those of waterproof ring 1325, ensuring its secure fit. Waterproof ring 1325 is embedded in groove 1324, simplifying assembly while ensuring a tight fit between waterproof ring 1325 and step 1323, enhancing the seal.

[0139] In one embodiment, an annular flange 151 is provided on the periphery of the inner partition 15 , and the annular flange 151 is embedded in the annular groove 1324 to abut against the waterproof ring 1325 .

[0140] An annular flange 151 is provided on the periphery of the inner partition 15, and the annular flange 151 is embedded in the annular groove 1324 on the step portion 1323 and is tightly abutted against the waterproof ring 1325. This embedded design forms a continuous and tight sealing structure between the inner partition 15, the waterproof ring 1325 and the step portion 1323, further enhancing the sealing effect of the waterproof ring 1325 and ensuring the dryness and cleanliness of the inside of the outer shell 1.

[0141] Regarding the configuration of the housing 1, in another embodiment, refer to Figure 13 The side wall 13 and the top cover plate 14 are an integral structure, and the inner partition plate 15 is embedded in the side wall 13 .

[0142] This structure can also realize the formation of a device installation cavity 16 and a breathable chamber 17 above and below the inner partition 15, respectively, to achieve the purpose of waterproofing.

[0143] In one embodiment, a mounting boss is provided on a side of the side wall 13 away from the top cover plate 14 , and the mounting boss is provided with a mounting hole.

[0144] Mounting bosses are provided around the perimeter of the side wall 13, each with a mounting hole to facilitate mounting the barometric level gauge of this embodiment to the chemical tank. Specifically, during installation, the chemical tank has threaded holes through which bolts are passed and then fastened to secure the barometric level gauge.

[0145] On the other hand, a liquid storage device is provided, comprising a liquid storage tank and the above-mentioned barometric level gauge, wherein the housing 1 of the barometric level gauge is installed on the top of the liquid storage tank, and the air guide pipe 5 of the barometric level gauge extends from one end of the housing 1 to the bottom of the liquid storage tank.

[0146] Similarly, the air pressure level gauge in the liquid storage device of this embodiment has the advantage of good waterproof capability.

[0147] On the other hand, a plant protection equipment is provided, comprising a carrier, a spraying system and the above-mentioned liquid storage device, wherein the spraying system and the liquid storage device are installed on the carrier, and the spraying system is used to pump out the liquid in the liquid storage device and perform atomized spraying.

[0148] Among them, the vehicle can be an unmanned vehicle, a drone, a manually driven vehicle, etc.

[0149] The spraying system consists of a pumping device and an atomizer. Pipes at both ends of the pumping device connect to the liquid storage tank and the atomizer, respectively. The pumping device pumps the liquid from the storage tank, which is then atomized by the atomizer and evenly sprayed on the crops. Mobile spraying operations can be achieved by using a vehicle.

[0150] Based on the liquid storage device of this embodiment, similarly, the air pressure level gauge in the plant protection equipment of this embodiment has the advantages of strong waterproof ability and long service life.

[0151] In order to ensure the detection accuracy, the air pressure sensor 3 in the air pressure level gauge installed on the liquid tank is generally a relative air pressure sensor 3. The relative air pressure sensor 3 has at least two air pressure detection points, one of which is used to detect the air pressure in the vent pipe, and the other is used to detect the atmospheric pressure. By obtaining the difference between the internal and external air pressures and converting it into the liquid level height, the problem of atmospheric pressure changes affecting the liquid level detection accuracy can be avoided. Since the air pressure sensor 3 needs to be connected to the atmosphere to detect the atmospheric pressure, it is impossible to install the air pressure sensor 3 in an absolutely sealed environment. It is usually necessary to set an air vent on the shell 1 of the liquid level gauge to maintain connection with the atmosphere. Since the working environment of equipment in the field of agricultural plant protection is generally an outdoor environment, rainwater, river water, and cleaning water that are usually exposed to it can easily invade the interior of the liquid level gauge through the air vent, which leads to the problem that the internal air pressure sensor 3 and the circuit board of the existing liquid level gauge are easily damaged by water.

[0152] In order to overcome the above technical problems, refer to Figure 4 This embodiment also provides another barometric level gauge that effectively prevents splashing water, such as rainwater or washing water, from entering the gauge and potentially damaging the internal electronic components. It should be noted that this embodiment of the barometric level gauge can be combined with the design features of any one or more of the aforementioned embodiments.

[0153] A barometric level gauge according to the present embodiment includes a housing 1, a pressure sensor 3, and a second waterproof tube 6. A device mounting cavity 16 is provided in the housing 1, and an independent second sensing air chamber 161 is provided in the device mounting cavity 16. The housing 1 is further provided with a second air vent 18 connected to the second sensing air chamber 161. A pressure sensor is installed in the device mounting cavity 16, and the pressure sensor can sense the internal air pressure of the second sensing air chamber 161. One end of the second waterproof tube 6 is connected to the second air vent 18, and the other end is connected to the atmospheric pressure. The second sensing air chamber 161 is connected to the atmosphere through the second waterproof tube 6.

[0154] The component mounting cavity 16 is used to mount components such as the air pressure sensor 3 and the main control circuit board 7, and is adequately protected by the housing 1. The second sensing chamber 161 is a portion separated from the component mounting cavity 16, and its volume is necessarily smaller than the entire component mounting cavity 16. The air pressure sensor 3 is equipped with a second sensitive element for sensing the air pressure within the second sensing chamber 161. The air pressure sensor 3 can be installed within or outside the second sensing chamber 161, as long as the second sensitive element on the air pressure sensor 3 is aligned and facing the second sensing chamber 161.

[0155] Under normal conditions, the second waterproof tube 6 connects the second sensing chamber 161 to the outside world, achieving connectivity between the second sensing chamber 161 and the atmosphere. When exposed to water, the second waterproof tube 6 effectively waterproofs the air. The waterproofing principle of the second waterproof tube 6 is similar to that of a capillary tube. When external liquid enters the second waterproof tube 6 through the end of the second waterproof tube 6 away from the second sensing chamber 161, the liquid easily forms a water column within the second waterproof tube 6 due to liquid tension. This water column isolates the space between the device mounting cavity 16 and the second waterproof tube 6 from the outside world, effectively forming a seal that prevents air from escaping between the air pressure sensor 3 and the second waterproof tube 6. Once the external liquid pressure balances with the air pressure within the second waterproof tube 6, liquid cannot enter any further, thereby achieving the purpose of waterproofing the air pressure sensor 3.

[0156] In summary, a barometric level gauge according to this embodiment includes an independent second sensing chamber 161 disposed within the device mounting cavity 16 of the barometric level gauge, and a barometric pressure sensor 3 capable of sensing the air pressure within the second sensing chamber 161. A second waterproof tube 6 communicating with the internal second sensing chamber 161 is disposed on the housing 1 of the barometric level gauge. The second sensing chamber 161 is connected to the atmosphere through the second waterproof tube 6, thereby enabling the barometric pressure sensor 3 to sense atmospheric pressure. The second waterproof tube 6 has a small flow area, similar to a capillary tube. When external liquid enters the second waterproof tube 6, the liquid easily forms a water column within the second waterproof tube 6 under the action of liquid tension. This water column can isolate the second sensing chamber 161 from the outside world, effectively forming a seal that prevents the air within the second sensing chamber 161 from escaping. Once the external liquid pressure balances with the air pressure within the second sensing chamber 161, further liquid cannot enter, thereby achieving the purpose of waterproofing the second sensing chamber 161. Therefore, the barometric level gauge of the present invention can satisfy the function of the barometric pressure sensor 3 being connected to the atmospheric pressure and detecting the atmospheric pressure in real time under normal use. It can also be effectively isolated from the outside world when encountering water, thereby achieving effective waterproofing and providing effective protection for the barometric pressure sensor 3 used for the air pressure in the second sensing air chamber 161. In addition, since a second sensing air chamber 161 is provided for connecting to the atmospheric pressure, the device mounting cavity 16 does not need to provide ventilation, and it can be completely sealed, so the problem of water entering circuit components such as the main control circuit board 7 in the device mounting cavity 16 can be completely avoided.

[0157] After in-depth research, the inventors of this application discovered that when a water immersion accident occurs, external water enters the second waterproof tube 6 through the first air vent 19 and forms a water column in the second waterproof tube 6. The deeper the water immersion, the greater the external water pressure, and the greater the counteracting air pressure that needs to be provided in the device installation cavity 16. Therefore, the water column needs to have a greater degree of compression. It can be understood that when the volume of the device installation cavity 16 is larger, when the same pressure needs to be increased, more gas needs to be compressed, that is, the length of the water column needs to be longer. Generally, components such as a control circuit board are also installed in the device installation cavity 16, which makes it impossible to reduce the space of the device installation cavity 16. Therefore, in order to achieve improved deep water resistance and waterproofing capabilities, extending the second waterproof tube 6 is one way. However, the space available for setting the second waterproof tube 6 on the housing 1 is limited, and it is generally difficult to set a very long second waterproof tube 6 to provide sufficient waterproofing capabilities.

[0158] In order to overcome the above problems, the second sensing air chamber 161 of this embodiment is a part separated from the device installation cavity 16, so its volume is obviously smaller than the entire device installation cavity 16. When water enters, the water column in the second waterproof tube 6 only needs to compress the air in the second sensing air chamber 161. Compared with compressing the entire device installation cavity 16, it is easier to compress the gas in the second sensing air chamber 161 with a smaller volume to a sufficient pressure. Therefore, based on this improvement, even when a shorter second waterproof tube 6 is set, better deep water resistance can also be obtained.

[0159] Due to the design of the second waterproof tube 6, the barometric level gauge of this embodiment is not only resistant to conventional splashing water but also provides water resistance. In other words, even if the barometric level gauge is completely immersed in water, the isolation provided by the second waterproof tube 6 can prevent water from entering the second sensing air chamber 161. This barometric level gauge is particularly advantageous when used in automatic spraying equipment mounted on drones, because even if the entire barometric level gauge is immersed in water, it can still achieve effective waterproofing. When a drone carrying the automatic spraying equipment is performing plant protection work and accidentally falls while flying over water, the drone and the medicine tank can be prevented from entering the barometric level gauge.

[0160] In addition, when the second waterproof tube 6 of the barometric level gauge is blocked by water, the water in the second waterproof tube 6 can be shaken out by shaking or knocking, and the gauge can be restored to use.

[0161] When the inventors of this application initially considered waterproofing the air pressure sensor 3 of the liquid level gauge, they immediately came up with the idea of ​​installing a waterproof vent valve in the vent opening of the housing. This vent valve is air-permeable but water-tight, precisely meeting the requirements for breathability and waterproofing. However, in actual use, the inventors discovered that when the vent membrane inside the waterproof vent valve becomes wet, the entire valve needs to be disassembled, dried, and then reassembled, making the drainage process more complicated. More importantly, because the vent membrane inside the waterproof vent valve cannot be directly seen from the outside, users often cannot determine whether the vent membrane is wet. During use, they often need to disassemble the waterproof vent valve and inspect the vent membrane, which places a certain burden on users. After many experiments and research and development, the inventor of this application creatively designed a breathable and waterproof structure with a second waterproof tube 6 in the embodiment of this application. The second waterproof tube 6 is a transparent tube. Before use, the user can intuitively observe whether water has entered the second waterproof tube 6. When water is found to have entered, the water can be drained out by shaking or flicking the second waterproof tube 6. Compared with the method of using a waterproof breathable valve for waterproofing, the second waterproof tube 6 of this solution is more user-friendly.

[0162] In one embodiment, the air pressure sensor is installed in the second sensing chamber 161 and includes a second sensitive element for sensing the internal air pressure of the second sensing chamber 161 .

[0163] Installing the pressure sensor within the second sensing chamber 161 facilitates sealing and isolating the second sensing chamber 161. Furthermore, the pressure sensor can occupy most of the space within the second sensing chamber 161, significantly reducing the air volume within the second sensing chamber 161. This further enhances the deepwater resistance of this solution.

[0164] In one embodiment, combining Figure 3-Figure 4 A main control circuit board 7 is installed in the device installation cavity 16, and an air chamber groove is provided in the housing 1 on one side of the device installation cavity 16. The main control circuit board 7 is fixed in the housing 1 and covers the air chamber groove to separate the second sensing air chamber 161.

[0165] As one of the core components of the barometric level gauge, the main control circuit board 7 is not only responsible for controlling the operation and data processing of the entire device, but also plays the role of separating the space in this design. The main control circuit board 7 is installed in the device installation cavity 16, and its position is cleverly arranged to cover the air chamber groove. In this way, the main control circuit board 7 naturally becomes a partition, dividing the device installation cavity 16 into two parts: one part is the main control circuit board 7 and its surrounding area, which is used to install other necessary electronic components; the other part is the covered air chamber groove, namely the second sensing air chamber 161. Based on this, it is achieved to separate the independent second sensing air chamber 161 while utilizing the original components of the barometric level gauge without adding additional components and complex structures, thereby achieving the purpose of improving the deep water and waterproof capabilities. In this way, this solution has the advantages of simple structure and low cost.

[0166] In one embodiment, referring to Figure 3-Figure 4 The shell 1 includes a shell base 11 and a shell cover 12, and the shell cover 12 covers the shell base 11 to form the device mounting cavity 16 between the shell base 11 and the shell cover 12; the air chamber groove is set in the shell base 11, and the main control circuit board 7 is fixed on the shell base 11.

[0167] The housing 1 consists of two parts: a housing base 11 and a housing cover 12. The housing base 11 serves as a supporting and fixing structure on which various electronic components and parts can be installed; the housing cover 12 covers the housing base 11 and is tightly combined with the housing base 11 through a sealing connection (such as screws, clips or glue, etc.), thereby forming a relatively closed space between the two, namely the device mounting cavity 16. An air chamber groove is provided on the housing base 11, which enables the air pressure sensor 3 to be installed on the housing base 11, so that it can be directly aligned with the connector 2 on the housing base 11, thereby realizing the function of the air pressure sensor 3 to detect atmospheric pressure and liquid side pressure. The main control circuit board 7 is fixedly mounted on the housing base 11, and the main control circuit board 7 naturally serves to separate the second sensing air chamber 161 from the device mounting cavity 16.

[0168] In one embodiment, an airtight ring 113 is provided between the main control circuit board 7 and the housing base 11 and surrounds the air chamber groove.

[0169] By introducing the airtight ring 113 , the contact surface between the main control circuit board 7 and the housing base 11 is better sealed, thereby improving the airtightness of the second sensing air chamber 161 .

[0170] In one embodiment, a surface of the airtight ring 113 for contacting the main control circuit board 7 is provided with convex ribs 1131 surrounding the air chamber groove, and the convex ribs 1131 are at least two and spaced apart.

[0171] The design of the convex ribs 1131 forms multiple sealing lines, which can more effectively block the penetration of moisture and gas, thereby effectively ensuring the airtightness of the second sensing air chamber 161.

[0172] In one embodiment, the shell base 11 is provided with a supporting boss 111 arranged around the air chamber groove. The supporting boss 111 is provided with an airtight groove 112 , and the airtight ring 113 is embedded in the airtight groove 112 for installation.

[0173] The combined design of the supporting boss 111 and the airtight groove 112 enables the airtight ring 113 to be partially embedded in the airtight groove 112 and supported and fixed by the supporting boss 111, thereby improving the installation reliability of the airtight ring 113. In addition, it can also make the sealing effect of the airtight ring 113 more significant.

[0174] In one embodiment, the shell base 11 is provided with a plurality of mounting threaded holes arranged around the air chamber groove, and the main control circuit board 7 is provided with positioning holes corresponding to the mounting threaded holes. The mounting screws pass through the positioning holes and are threadedly locked to the mounting threaded holes so that the main control circuit board 7 is tightly pressed against the airtight ring 113.

[0175] During installation, mounting screws are inserted through the positioning holes on the main control circuit board 7 and threaded into the mounting threaded holes on the housing base 11. As the screws are tightened, the main control circuit board 7 is gradually pressed against the housing base 11, and the airtight ring 113 is also tightly pressed between the two. This compression method ensures a reliable sealing interface between the airtight ring 113, the main control circuit board 7, and the housing base 11, effectively preventing the penetration of moisture and gas. This structure also has the advantage of being reusable for assembly and disassembly.

[0176] Preferably, a plurality of circuit board locking platforms are arranged in an array on the shell base 11, and the circuit board locking platforms are provided with the mounting threaded holes. After the main control circuit board 7 is installed on the circuit board locking platform, the screws are installed to fix it. In this way, the main control circuit board 7 can be reliably installed so that the main control circuit board 7 can be in close contact with the airtight ring 113.

[0177] In one embodiment, a connector 2 for connecting the air duct 5 is protruded from the side of the shell base 11 facing away from the shell cover 12, and the second air vent 18 is located on the shell base 11 and is arranged away from the connector 2; the air chamber groove includes a sensor mounting area 1611 and a bypass narrow air channel 1612, and the sensor mounting area 1611 is arranged corresponding to the connector 2, and the bypass narrow air channel 1612 connects the sensor mounting area 1611 and the second air vent 18.

[0178] Specifically, the air pressure sensor 3 of this embodiment adopts a relative air pressure sensor 3, which has at least a second sensitive element and a first sensitive element. The second sensitive element is used to sense the atmospheric pressure, and the first sensitive element is used to sense the pressure of the air chamber connected to the liquid. In order to enable the second sensitive element and the first sensitive element to perform their respective functions, in this embodiment, a connector 2 is provided on one side of the shell base 11, and the connector 2 is connected to an air duct 5 that can extend into the liquid. A first sensing air chamber 211 connected to the air duct 5 is provided in the connector 2. After the air pressure sensor 3 is fixedly installed in the device installation cavity 16, the second sensitive element is just located on the side of the device installation cavity 16, and the first sensitive element is just facing the first sensing air chamber 211. After the air pressure sensor 3 is installed, the first sensing air chamber 211 and the device installation cavity 16 are just separated. As long as the device installation cavity 16 is connected to the atmosphere, the second sensitive element can sense the atmospheric pressure and the first sensitive element can sense the air pressure on the liquid side. Preferably, refer to Figure 5In order to effectively isolate the first sensing air chamber 211 from the device installation cavity 16, the air pressure sensor 3 includes a sensor body 31 and a sensor tube 32. The second sensitive element is located on the side of the sensor body 31, and the first sensitive element is aligned with the tube cavity of the sensor tube 32. A sealing ring 33 is provided at the position connecting the first sensing air chamber 211 in the device installation cavity 16, and the sensor tube 32 is inserted into the sealing ring 33. In this way, the first sensing air chamber 211 can be effectively isolated from the device installation cavity 16 based on the installation of the air pressure sensor 3 and the sealing ring 33.

[0179] The air chamber groove is divided into two parts: a sensor installation area 1611 and a bypass narrow air channel 1612. The air pressure sensor 3 is installed in the sensor installation area 1611, so that its sensor tube can be directly aligned with the first sensing air chamber 211 in the connector 2, which facilitates the installation of the air pressure sensor 3; in addition, the bypass narrow air channel 1612 is used to connect the second air vent 18 with the sensor installation area 1611, so that the sensor installation area 1611 can be connected to the second waterproof tube 6, realizing the function of the air pressure sensor 3 to sense atmospheric pressure. This structure can reduce the volume of the entire second sensing air chamber 161 to the greatest extent on the basis of meeting the ventilation requirements, thereby achieving the purpose of improving the deep water and waterproof capabilities.

[0180] In another embodiment, a connector 2 for connecting the air duct 5 is protruded from the side of the shell base 11 facing away from the shell upper cover 12, the air chamber groove is arranged corresponding to the connector 2, and the second air vent 18 is located on the side of the connector 2 and connected to the air chamber groove.

[0181] In this embodiment, the second vent hole 18 is directly provided on the side of the connector 2, so that the second vent hole 18 can be directly connected to the air chamber groove inside the connector 2, thereby obtaining the shortest connection path and minimizing the volume of the air chamber groove to the greatest extent.

[0182] In one embodiment, a ventilation chamber 17 is provided on a side of the housing base 11 facing away from the housing upper cover 12 , and the second waterproof tube 6 is coiled around the connector 2 in the ventilation chamber 17 .

[0183] A breathable chamber 17 is provided on the side of the housing base 11 facing away from the housing cover 12. This breathable chamber 17 accommodates the second waterproof tube 6, thereby concealing and protecting the second waterproof tube 6. Furthermore, in the event of a water immersion accident, external water enters the second waterproof tube 6 and forms a water column within the second waterproof tube 6. The deeper the water immersion, the greater the external water pressure, the greater the pressure exerted by the water column on the device mounting cavity 16, the longer the formed water column, and the greater the degree of compression of the gas within the device mounting cavity 16 by the water column. Consequently, the greater the increase in pressure within the device mounting cavity 16. When the air pressure within the device mounting cavity 16 reaches equilibrium with the external water pressure, the water column can no longer extend inward. Therefore, the length of the water column that can be formed within the second waterproof tube 6 determines the waterproof capability of the device mounting cavity 16. The longer the length of the water column that can be formed, the deeper the device mounting cavity 16 can remain effectively waterproof, i.e., it achieves better deepwater resistance. In this solution, the second waterproof tube 6 is arranged in a spiral shape around the connector 2, which can effectively utilize the limited space in the air permeable chamber 17 to fully arrange the second waterproof tube 6. Importantly, the spiral second waterproof tube 6 has the advantage of being long while occupying a small space, which is conducive to obtaining a longer second waterproof tube 6 and obtaining better deep water resistance.

[0184] In one embodiment, combining Figure 8-Figure 9 A pipe clamping member 114 is provided on the side of the shell base 11 facing away from the shell upper cover 12 , and the second waterproof tube 6 is clamped on the pipe clamping member 114 .

[0185] The design of the pipe clamp 114 enables the second waterproof pipe 6 to be firmly fixed on the inner partition 15, avoiding loosening or falling off due to external factors such as vibration and impact. This stable connection ensures the reliability of the second waterproof pipe 6 during long-term use and prevents water or air leakage caused by unstable connection.

[0186] In one embodiment, a first vent hole 19 is provided on the side of the housing base 11 , and the vent chamber 17 is connected to the atmosphere through the first vent hole 19 .

[0187] Specifically, a first air vent 19 is provided on the side of the shell base 11 for communicating with the atmosphere. It can be understood that after the barometric level gauge of this embodiment is installed, the device installation cavity 16 is located above the air chamber 17, that is, the second air vent 18 is also located above the air chamber 17. When rain, cleaning, etc. occur, even if splashing water enters the air chamber 17 through the side wall 13 or the holes, grooves, etc. connected to the air chamber 17 on the medicine tank, it is difficult to splash upward in the air chamber 17 and enter the device installation cavity 16 through the second air vent 18.

[0188] In this way, the housing's inherent design resists most splashing water, achieving waterproofing. In most cases, water will not enter the second waterproof tube 6, thus reducing the number of times the user must drain the second waterproof tube 6. The primary function of the second waterproof tube 6 in this embodiment is to provide a safety feature for waterproofing. During normal use, external splashing water cannot enter the second waterproof tube 6. In the event of water immersion, the second waterproof tube 6 prevents external water from entering the device mounting cavity 16 through the second waterproof tube 6, ensuring proper waterproofing even in the presence of water. The advantages of a barometric pressure level gauge with a second waterproof tube 6 are particularly evident in applications with drone-mounted automatic spraying equipment. This solution provides effective waterproofing even when the entire gauge is submerged in water. This prevents water from entering the gauge if the drone and its medicine tank fall into the water while flying over water during plant protection operations.

[0189] In one embodiment, the second waterproof tube 6 utilizes the surface tension of water to form a water column in the second waterproof tube 6 when water enters, thereby preventing external water from further passing through the second waterproof tube 6 and invading the air pressure sensor 3 .

[0190] Specifically, the waterproof function of the second waterproof tube 6 is achieved by utilizing the principle of liquid surface tension. It is only necessary to set the inner diameter of the second waterproof tube 6 to be small enough so that a water column can be formed therein when water enters. The second waterproof tube 6 of this structure has the advantages of simple structure and low cost.

[0191] In one embodiment, the inner diameter of the second waterproof tube 6 is 1.5-3.5 mm.

[0192] Setting the inner diameter of the second waterproof tube 6 to 1.5-3.5 mm can meet normal ventilation requirements, and at the same time can utilize the surface tension of the liquid to form a water column in the second waterproof tube 6 to achieve the waterproof function.

[0193] On the other hand, a liquid storage device is provided, comprising a liquid storage tank and the above-mentioned barometric level gauge, wherein the housing 1 of the barometric level gauge is installed on the top of the liquid storage tank, and the air guide pipe 5 of the barometric level gauge extends from one end of the housing 1 to the bottom of the liquid storage tank.

[0194] Similarly, the air pressure level gauge in the liquid storage device of this embodiment has the advantage of good waterproof capability.

[0195] On the other hand, a plant protection equipment is provided, comprising a carrier, a spraying system and the above-mentioned liquid storage device, wherein the spraying system and the liquid storage device are installed on the carrier, and the spraying system is used to pump out the liquid in the liquid storage device and perform atomized spraying.

[0196] Among them, the vehicle can be an unmanned vehicle, a drone, a manually driven vehicle, etc.

[0197] The spraying system consists of a pumping device and an atomizer. Pipes at both ends of the pumping device connect to the liquid storage tank and the atomizer, respectively. The pumping device pumps the liquid from the storage tank, which is then atomized by the atomizer and evenly sprayed on the crops. Mobile spraying operations can be achieved by using a vehicle.

[0198] Based on the liquid storage device of this embodiment, similarly, the air pressure level gauge in the plant protection equipment of this embodiment has the advantages of strong waterproof ability and long service life.

[0199] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other positions or relationships are used solely for ease of description and simplified operation, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific position. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "second" and "first" are used solely for descriptive purposes and have no special meaning.

[0200] Throughout this specification, references to terms such as "one embodiment" and "example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example.

[0201] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0202] The technical principles of the present application have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the present application and are not to be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art will be able to devise other specific implementations of the present application without inventive effort, and such implementations will fall within the scope of protection of the present application.

Claims

1. A barometric level gauge, characterized in that: include: Air pressure sensor (3); a first waterproof tube (4) connected to the air pressure sensor (3); An air guide tube (5) has an inner diameter greater than that of the first waterproof tube (4); one end of the air guide tube (5) is connected to the air pressure sensor (3) through the first waterproof tube (4); and the other end is used to extend into the liquid to sense the water pressure.

2. The barometric level gauge according to claim 1, characterized in that: The invention also includes a connector (2), wherein a first sensing air chamber (211) is provided inside the connector (2); the air pressure sensor (3) includes a first sensitive element for sensing the air pressure inside the first sensing air chamber (211); and the first waterproof tube (4) is connected to the connector (2) and communicates with the first sensing air chamber (211).

3. The barometric level gauge according to claim 2, characterized in that: The connector (2) comprises a connecting head (22), the connecting head (22) comprising a first connecting column (222) and a second connecting column (221) connected to each other, an air duct (223) penetrating the first connecting column (222) and the second connecting column (221) is provided in the connecting head (22), and the air duct (223) is connected to the first sensing air chamber (211); the first waterproof tube (4) is connected to the second connecting column (221), and the air guide tube (5) is sleeved outside the first waterproof tube (4) and connected to the first connecting column (222).

4. The barometric level gauge according to claim 3, characterized in that: The first waterproof tube (4) is sleeved on the second connecting column (221); and / or the air guide tube (5) is sleeved on the first connecting column (222).

5. The barometric level gauge according to claim 3, characterized in that: The connector (2) comprises a mounting seat (21) and a connecting head (22); the first sensing air chamber (211) is arranged on the mounting seat (21); and the connecting head (22) and the mounting seat (21) are an integrated structure.

6. The barometric level gauge according to claim 2, characterized in that: The connector (2) comprises a mounting seat (21), a flexible tube (23) and a connector (22); the first sensing air chamber (211) is arranged on the mounting seat (21); and two ends of the flexible tube (23) are respectively connected to the mounting seat (21) and the connector (22) to conduct the air passage (223) in the first sensing air chamber (211) and the connector (22).

7. The air pressure level gauge according to claim 6, characterized in that: The connector (22) is provided with a third connecting column, the mounting seat (21) is provided with a fourth connecting column, and both ends of the flexible tube (23) are respectively sleeved on the third connecting column and the fourth connecting column.

8. The barometric level gauge according to claim 1, characterized in that: The first waterproof tube (4) utilizes the surface tension principle of water. When water enters, a water column is formed in the first waterproof tube (4) to prevent external water from further invading the air pressure sensor (3) through the first waterproof tube (4).

9. The air pressure level gauge according to claim 8, characterized in that: The inner diameter of the first waterproof tube (4) is 1.5-3.5 mm.

10. The barometric level gauge according to claim 1, characterized in that: The inner diameter of the air guide tube (5) is 5-12 mm.

11. The barometric level gauge according to claim 2, characterized in that: The air pressure sensor (3) comprises a sensor body (31), a sensor cannula (32) being provided on one side of the sensor body (31); the first sensitive element being arranged in the sensor cannula (32); and a sensing connection hole communicating with the first sensing air chamber (211) being provided on the connector (2), the sensor cannula (32) being plugged into the sensing connection hole, so that the first sensitive element can sense the internal air pressure of the first sensing air chamber (211).

12. The barometric level gauge according to claim 11, characterized in that: A sealing ring (33) is provided in the sensing connection hole, and the sensor cannula (32) is inserted into the sealing ring (33).

13. The barometric level gauge according to claim 11, characterized in that: The air pressure sensor (3) also includes a second sensitive element for sensing atmospheric pressure.

14. The air pressure level gauge according to claim 11, characterized in that: It comprises a shell upper cover (12), which is mounted on the connector (2) and covers the air pressure sensor (3).

15. The barometric level gauge according to any one of claims 1 to 14, characterized in that: The air pressure level gauge is used in a liquid medicine tank for plant protection.

16. A liquid storage device, characterized in that: The invention comprises a liquid storage tank and the air pressure level gauge according to any one of claims 1 to 15.

17. A plant protection device, characterized in that: It comprises a carrier, a spraying system and the liquid storage device according to claim 16, wherein the spraying system and the liquid storage device are installed on the carrier, and the spraying system is used to pump out the liquid in the liquid storage device and perform atomized spraying.

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