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

Abstract

The invention discloses an air pressure liquid level meter, a liquid storage device and plant protection equipment, and the air pressure liquid level meter comprises a shell which is internally provided with a device installation cavity, the shell is provided with a ventilation groove, and the shell is also provided with a first ventilation hole which communicates the ventilation groove with the device installation cavity; the air pressure sensor is mounted in the device mounting cavity; the covering piece is installed on the shell and covers the ventilation groove, and a narrow ventilation channel is defined by the covering piece and the groove wall of the ventilation groove; the side wall of the ventilation groove or the covering piece is provided with a second ventilation hole communicated with the ventilation narrow channel, and the device installation cavity is communicated with the atmosphere through the ventilation narrow channel and the second ventilation hole. The barometric liquid level meter can meet the functions that the barometric sensor is communicated with the barometric pressure and the barometric pressure is detected in real time in the normal use state, can be effectively separated from the outside when meeting water, and can effectively protect devices such as the barometric sensor in the device mounting cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inductive devices, in particular to a gas pressure liquid level meter, a liquid storage device and a plant protection equipment. BACKGROUND

[0002] In the field of plant protection, a gas pressure liquid level meter is usually integrated in an automatic pesticide spraying equipment. The main body of the gas pressure liquid level meter is generally installed on the top of a pesticide tank, and the air pipe thereof extends to the bottom of the pesticide tank. The gas pressure liquid level meter can be used to automatically monitor the liquid level in the pesticide tank in real time. In order to ensure the detection accuracy, the gas pressure sensor in the gas pressure liquid level meter installed on the pesticide tank is generally a relative gas pressure sensor. The relative gas pressure sensor has at least two gas pressure detection points. One of the detection points is used to detect the gas pressure in the air pipe, and the other detection point is used to detect the atmospheric pressure. By obtaining the difference between the internal and external gas pressures and converting it into a liquid level height, the problem of affecting the liquid level detection accuracy caused by the change of atmospheric pressure can be avoided. Since the gas pressure sensor needs to be in communication with the atmosphere to detect the atmospheric pressure, the gas pressure sensor cannot be installed in an absolutely sealed environment. Therefore, a gas permeable hole is usually provided on the shell of the liquid level meter to maintain communication with the atmosphere. However, since the working environment of the equipment in the field of agricultural plant protection is generally an outdoor environment, rainwater, river water and cleaning water, etc. that are usually contacted can easily invade the inside of the liquid level meter through the gas permeable hole, thereby causing the problem that the internal gas pressure sensor and the circuit board of the existing liquid level meter are easily damaged by water. SUMMARY

[0003] The purpose of the embodiment of the present application is to provide a gas pressure liquid level meter, a liquid storage device and a plant protection equipment, which can solve the above-mentioned problems existing in the prior art.

[0004] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0005] On the one hand, a gas pressure liquid level meter is provided, which comprises:

[0006] A shell is provided with a device mounting cavity. The shell is provided with a gas permeable groove. A first gas permeable hole is provided on the shell to communicate the gas permeable groove with the device mounting cavity.

[0007] A gas pressure sensor is installed in the device mounting cavity.

[0008] A cover member is installed on the shell and covers the gas permeable groove. A gas permeable narrow passage is formed between the cover member and the groove wall of the gas permeable groove. A second gas permeable hole is provided on the side wall of the gas permeable groove or the cover member to communicate with the gas permeable narrow passage. The device mounting cavity is in communication with the atmosphere through the gas permeable narrow passage and the second gas permeable hole.

[0009] Optionally, the first air vent and the second air vent are arranged at two ends of the air venting channel, respectively.

[0010] Optionally, the air venting channel has a width or height of no more than 3 mm.

[0011] Optionally, the cover member comprises a cover plate and a rib arranged on one side of the cover plate, the rib is arranged corresponding to the shape of the air venting groove, the cover plate is arranged on the shell, the rib is embedded in the air venting groove, and the surface of the rib and the groove arm of the air venting groove form the air venting channel.

[0012] Optionally, a connecting head for connecting an air guide pipe is arranged on one side of the shell, and the air venting groove is arranged spirally around the connecting head.

[0013] Optionally, the shell has a mounting side which is mounted on the surface of a mounting body, the shell is provided with a receiving groove on the mounting side, and the air venting groove is arranged in the receiving groove.

[0014] Optionally, the shell is provided with a third air vent on the mounting side, and the third air vent is used for connecting the receiving groove with the atmosphere.

[0015] Optionally, a fixed supporting plate is arranged in the receiving groove, and the fixed supporting plate supports the cover member so that the cover member tightly covers the air venting groove.

[0016] Optionally, a first clamping block is arranged on the inner side wall of the receiving groove, and the first clamping block clamps the fixed supporting plate so as to support the cover member.

[0017] Optionally, the receiving groove is a cylindrical groove, and a plurality of first clamping blocks are arranged in the cylindrical groove; the fixed supporting plate is a cylindrical plate, and a plurality of second clamping blocks corresponding to the first clamping blocks are arranged on the outer periphery of the cylindrical plate, the first clamping blocks and the second clamping blocks are matched to clamp the fixed supporting plate, and the first clamping blocks and the second clamping blocks can be unlocked or locked by rotating the fixed supporting plate.

[0018] Optionally, the fixed supporting plate is provided with a handle, and the fixed supporting plate can be twisted by the handle.

[0019] Optionally, a first air sensing chamber is separated in the device mounting cavity, the first air vent is connected with the first air sensing chamber, the air pressure sensor is arranged in the first air sensing chamber, and the air pressure sensor comprises a first sensitive element for sensing the internal air pressure of the first air sensing chamber.

[0020] Optionally, the housing has an air chamber groove located on one side of the device mounting cavity, and a main control circuit board is installed in the device mounting cavity. The main control circuit board covers the air chamber groove to separate the first sensing air chamber.

[0021] Optionally, the housing includes a housing base and a housing top cover, the housing top cover covering the housing base to form the device mounting cavity between the housing base and the housing top cover; the air chamber groove is disposed on the housing base, and the main control circuit board is fixed on the housing base.

[0022] Optionally, a first airtight ring is provided between the main control circuit board and the housing base, surrounding the air chamber groove.

[0023] Optionally, the shell base is provided with a support boss surrounding the air chamber groove, the support boss is provided with an airtight groove, and the first airtight ring is embedded in the airtight groove.

[0024] Optionally, the shell base has a connector for connecting the air duct on the side opposite to the shell cover, and the first vent is located on the shell base and is disposed away from the connector; the air chamber groove includes a sensor mounting area and a bypass narrow air channel, the sensor mounting area is disposed corresponding to the connector, and the bypass narrow air channel connects the sensor mounting area and the first vent.

[0025] Optionally, the pneumatic level gauge is used in the pesticide tank of plant protection equipment.

[0026] On the other hand, a liquid storage device is provided, including a liquid storage tank and the aforementioned pneumatic level gauge, wherein the housing of the pneumatic level gauge is mounted on the top of the liquid storage tank, and the end of the pneumatic level gauge's air guide tube away from the housing extends to the bottom of the liquid storage tank.

[0027] On another front, a plant protection device is provided, comprising a vehicle, a spraying system, and the aforementioned liquid storage device, wherein the spraying system and the liquid storage device are mounted on the vehicle, and the spraying system is used to pump out the liquid from the liquid storage device and perform atomized spraying.

[0028] The beneficial effects of this application are as follows: This invention provides a barometric level gauge, a liquid storage device, and a plant protection device. The barometric level gauge has a venting groove on its outer shell that communicates with an internal device mounting cavity. A cover is also provided to close the venting groove. When closed, the groove wall and the cover form a narrow venting channel. The device mounting cavity is connected to the atmosphere through this narrow venting channel, enabling the barometric pressure sensor inside the cavity to sense atmospheric pressure. The narrow venting channel has a small flow area, similar to a capillary tube. When external liquid enters the narrow venting channel through a second vent, the liquid easily forms a water column within the channel under the action of liquid tension. This water column isolates the device mounting cavity from the outside, effectively sealing it and preventing air from escaping. Once the pressure of the external liquid balances with the air pressure inside the device mounting cavity, the liquid cannot continue to enter, thus achieving waterproofing of the device mounting cavity. Therefore, the pressure level gauge in this solution can meet the function of connecting the pressure sensor to atmospheric pressure and detecting atmospheric pressure in real time under normal use. It can also effectively isolate itself from the outside when it encounters water, achieving effective waterproofing and providing effective protection for the pressure sensor and other devices in the device mounting cavity. Attached Figure Description

[0029] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the structure of the pneumatic level gauge described in the embodiments of this application;

[0031] Figure 2 This is a cross-sectional view of the pneumatic level gauge described in the embodiment of this application;

[0032] Figure 3 for Figure 2 Enlarged view of region A in the middle;

[0033] Figure 4 This is one of the explosion diagrams of the pneumatic level gauge described in the embodiments of this application;

[0034] Figure 5 This is the second exploded schematic diagram of the pneumatic level gauge described in the embodiments of this application;

[0035] Figure 6 This is a schematic diagram of the shell base from one perspective of an embodiment of this application;

[0036] Figure 7 This is a structural schematic diagram of the shell base described in an embodiment of this application from another perspective;

[0037] Figure 8 This is a structural schematic diagram of the shell base described in the embodiments of this application from another perspective;

[0038] Figure 9This is a cross-sectional view of the shell base described in the embodiment of this application;

[0039] Figure 10 This is a schematic diagram of the structure of the cover component described in the embodiment of this application;

[0040] Figure 11 This is a schematic diagram of the fixed support plate from one perspective, as described in an embodiment of this application.

[0041] Figure 12 This is a structural schematic diagram of the fixed support plate described in an embodiment of this application from another perspective.

[0042] In the picture:

[0043] 1. Outer shell; 11. Shell base; 111. Vent groove; 112. First vent hole; 113. Receiving groove; 114. First locking block; 115. Third vent hole; 116. Connector; 1161. Second sensing air chamber; 117. Air chamber groove; 1171. Sensor mounting area; 1172. Bypass narrow air passage; 118. Support boss; 119. Circuit board locking platform; 12. Shell top cover; 13. Vent narrow passage; 14. Device mounting cavity; 141. First sensing air chamber; 2. Main control circuit board; 21. First airtight ring; 3. Barometric pressure sensor; 31. Sensor body; 32. Sensor insertion tube; 33. Second airtight ring; 4. Cover assembly; 41. Cover plate; 42. Protruding rib; 5. Fixing support plate; 51. Second locking block; 52. Handle. Detailed Implementation

[0044] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the field of plant protection, automatic pesticide spraying equipment typically integrates a barometric level gauge. The main body of the barometric level gauge is usually installed on top of the pesticide tank, with its vent pipe extending to the bottom of the tank. The barometric level gauge allows for real-time automatic monitoring of the pesticide level within the tank. To ensure detection accuracy, the barometric level gauge uses a relative pressure sensor. A relative pressure sensor has at least two pressure detection points: one to detect the pressure inside the vent pipe and the other to detect atmospheric pressure. By obtaining the difference between the internal and external pressures and converting it into the liquid level height, the problem of atmospheric pressure changes affecting the accuracy of level detection can be avoided. Because barometric pressure sensors need to be connected to the atmosphere to detect atmospheric pressure, they cannot be installed in an absolutely sealed environment. Typically, vent holes need to be provided on the housing of the level gauge to maintain atmospheric connection. However, since equipment in the agricultural plant protection field generally operates outdoors, rainwater, river water, and washing water can easily seep into the level gauge through the vent holes, leading to the problem that the internal barometric pressure sensor and circuit board of existing level gauges are easily damaged by water.

[0048] To overcome the above technical problems, this embodiment provides a pneumatic level gauge that can keep the pneumatic sensor 3 connected to the atmosphere during normal use, so that the pneumatic sensor 3 can detect atmospheric pressure in real time; at the same time, in the event of accidental water spillage or even immersion, it can effectively isolate the environment of the pneumatic sensor 3 from the outside, preventing water from entering the pneumatic level gauge and causing damage to the pneumatic sensor 3.

[0049] Specifically, a pneumatic level gauge is a detector that uses the principle of air pressure to measure the height of liquid. It inserts a certain length of air guide tube into the liquid and uses the compression of the gas in the air guide tube by the liquid to convert the liquid level change into an air pressure change. Then, the air pressure change is converted into a measurable electrical signal output through the internally integrated air pressure sensor 3.

[0050] Reference Figures 1-4The pneumatic level gauge of this embodiment includes a housing 1, within which a device mounting cavity 14 is provided. The device mounting cavity 14 provides a relatively enclosed space, allowing the pneumatic pressure sensor 3 to be installed within it, thus isolating it from external sources and preventing water ingress. Furthermore, when the pneumatic level gauge also includes a main control circuit board 2 for control and signal transmission functions, the main control circuit board 2 can also be installed within the device mounting cavity 14 for protection.

[0051] The pressure sensor 3 in this embodiment is a relative pressure sensor 3, which has at least a first sensitive element and a second sensitive element. The first sensitive element is used to sense atmospheric pressure, and the second sensitive element is used to sense the pressure of the air chamber connected to the liquid. In order to enable the first sensitive element and the second sensitive element to perform their respective functions, in one embodiment, a connector 116 is provided on one side of the housing 1. The connector 116 is connected to a gas guide tube that can extend into the liquid. A second sensing air chamber 1161 communicating with the gas guide tube is provided in the connector 116. After the pressure sensor 3 is fixedly installed in the device mounting cavity 14, the first sensitive element is located on the side of the device mounting cavity 14, and the second sensitive element is facing the second sensing air chamber 1161. After the pressure sensor 3 is installed, it isolates the second sensing air chamber 1161 from the device mounting cavity 14. As long as the device mounting cavity 14 is connected to the atmosphere, the first sensitive element can sense atmospheric pressure, and the second sensitive element can sense the air pressure on the liquid side.

[0052] Preferably, in order to effectively isolate the second sensing gas chamber 1161 from the device mounting cavity 14, refer to Figures 2-3 The pressure sensor 3 includes a sensor body 31 and a sensor tube 32. The first sensitive element is located on the side of the sensor body 31, and the second sensitive element is aligned with the lumen of the sensor tube 32. A second airtight ring 33 is provided in the device mounting cavity 14 at the position where the second sensing air chamber 1161 is connected. The sensor tube 32 is inserted into the second airtight ring 33. In this way, the second sensing air chamber 1161 can be effectively isolated from the device mounting cavity 14 based on the installation of the pressure sensor 3 and the second airtight ring 33.

[0053] To ensure the device mounting cavity 14 is connected to the atmosphere and to provide automatic waterproof protection when exposed to water, the specific structure of the pneumatic level gauge in this embodiment includes a venting groove 111 on the outer shell 1, and a first venting hole 112 connecting the venting groove 111 to the device mounting cavity 14. Additionally, the pneumatic level gauge includes a cover 4, which is mounted on the outer shell 1 and covers the venting groove 111. The cover 4 and the groove wall of the venting groove 111 enclose a narrow venting channel 13. Furthermore, the side wall of the venting groove 111 or the cover 4 is provided with a second venting hole communicating with the narrow venting channel 13. The device mounting cavity 14 is connected to the atmosphere through the narrow venting channel 13 and the second venting hole.

[0054] The purpose of the second vent is to allow the venting channel 13 to communicate with the atmosphere. It can be a through hole or notch directly opened on the side of the venting groove 111, or it can be a through hole or notch opened on one side of the cover 4. Alternatively, the cover 4 can be designed not to completely cover the venting groove 111. For example, if the length of the cover 4 is slightly shorter than the length of the venting groove 111, the second vent can be formed after the cover 4 is installed. In this case, it can be understood that the second vent is set on the cover 4.

[0055] Specifically, after the cover is closed, a narrow venting channel 13 is formed between the wall of the venting groove 111 and the cover 4. The device mounting cavity 14 is connected to the atmosphere through this narrow venting channel 13, enabling the pressure sensor 3 inside the device mounting cavity 14 to sense atmospheric pressure. The narrow venting channel 13 has a small flow area, similar to a capillary tube. When external liquid enters the narrow venting channel 13 through the second vent, the liquid easily forms a water column within the narrow venting channel 13 under the action of liquid tension. This water column isolates the device mounting cavity 14 from the outside, effectively creating a seal and preventing air from escaping. When the pressure of the external liquid balances with the air pressure inside the device mounting cavity 14, the liquid cannot continue to enter, thus achieving the purpose of waterproofing the device mounting cavity 14. Therefore, the pressure level gauge of this solution can meet the function of connecting the pressure sensor 3 to atmospheric pressure and detecting atmospheric pressure in real time under normal use. It can also effectively isolate the device from the outside when exposed to water, achieving effective waterproofing and providing effective protection for the pressure sensor 3 and other devices inside the device mounting cavity 14.

[0056] Importantly, the waterproof advantage of the pneumatic level gauge in this embodiment is even more pronounced when applied to plant protection equipment. In plant protection equipment, such as pesticide spraying equipment, the pneumatic level gauge can be installed in the pesticide tank to detect the pesticide level. In case of rain, accidental drop and immersion in water, or manual cleaning, even if water enters the venting channel 13 through the second vent, the surface tension of the water will quickly form a water column in the venting channel 13, thus preventing further water from entering the device mounting cavity 14, achieving automatic waterproofing. Furthermore, its advantages are particularly evident in drone-mounted automatic spraying equipment. Even if the entire pneumatic level gauge is submerged in water, it can still achieve effective waterproofing. When a drone carrying automatic spraying equipment is performing plant protection work, if the drone accidentally falls into the water while flying over the water surface, the drone and pesticide tank will fall into the water, preventing water from entering the pneumatic level gauge.

[0057] In addition, when the air vent 13 of the pressure level gauge is blocked by water, it can be restored to use by directly disassembling the cover 4, drying the air vent 111, and reinstalling the cover 4, or by shaking or tapping to shake out the water column in the air vent 13.

[0058] In one embodiment, combined with Figure 8 The first vent 112 and the second vent are respectively located at both ends of the venting channel 13.

[0059] Specifically, when water immersion occurs, external water enters the ventilated narrow channel 13 through the second vent and forms a water column within it. The deeper the immersion, the greater the external water pressure, and the greater the pressure exerted by the water column on the device mounting cavity 14. The longer the water column, the greater the degree of gas compression within the device mounting cavity 14, resulting in a greater increase in pressure within the cavity. When the gas pressure within the cavity 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 ventilated narrow channel 13 determines the waterproof capability of the device mounting cavity 14. The longer the water column, the more effectively the device mounting cavity 14 can maintain waterproofing in deeper water, thus achieving better deep-water resistance.

[0060] Therefore, in this embodiment, the first vent 112 and the second vent are respectively set at both ends of the vent slit 13, which can make full use of the length of the vent slit 13, so that a longer water column can be formed in the vent slit 13, so that the device mounting cavity 14 can have a greater ability to resist external pressure when water enters, and improve the waterproof capability.

[0061] In one embodiment, the width or height of the ventilated narrow channel 13 does not exceed 3 mm.

[0062] By controlling the width or height of the ventilating channel 13 to within 3mm, it is more conducive to the rapid formation of a water column within the ventilating channel 13 when water enters, so as to achieve effective waterproofing.

[0063] In one embodiment, reference is made to Figure 10 The cover 4 includes a cover plate 41 and a rib 42 protruding from one side of the cover plate 41. The rib 42 is configured to correspond to the shape of the ventilation groove 111. The cover plate 41 covers the outer shell 1. The rib 42 is embedded in the ventilation groove 111. The surface of the rib 42 and the groove arm of the ventilation groove 111 enclose each other to form the ventilation narrow channel 13.

[0064] The cover plate 41 fits against the surface of the outer shell 1 to provide support and fixation for the rib 42, allowing the rib 42 to penetrate a certain distance into the vent groove 111, forming a narrow ventilated channel 13 between the rib 42 and the wall of the vent groove 111. Utilizing the embedded structure of the rib 42, the vent groove 111 can be designed to a deeper depth (greater than 3mm), which is beneficial for the processing of the vent groove 111 and the control of depth accuracy. Furthermore, the two sides of the rib 42 contact the sidewalls of the vent groove 111, and the cover plate 41 abuts against the material around the vent groove 111, thus forming a tortuous labyrinthine sealing structure, which is beneficial for obtaining a more airtight narrow ventilated channel 13.

[0065] In one embodiment, reference is made to Figures 7-8 The outer shell 1 has a connector 116 protruding on one side for connecting an air duct (not shown), and the air vent 111 is arranged in a spiral around the connector 116.

[0066] Specifically, as mentioned above, the connector 116 is provided with a second sensing air chamber 1161 that communicates with the air guide tube. The connector 116 is connected to an air guide tube that can extend into the liquid. After the pressure sensor 3 is fixedly installed in the device mounting cavity 14, the second sensitive element of the pressure sensor 3 is exactly facing the second sensing air chamber 1161, so that the second sensitive element can sense the pressure on the liquid side.

[0067] This design arranges the ventilation groove 111 in a spiral shape around the connector 116, which can effectively utilize the limited space on the outer shell 1 to fully arrange the ventilation groove 111. Importantly, the spiral ventilation groove 111 has the advantage of being long while occupying less space, which is conducive to obtaining a longer ventilation channel 13. As mentioned above, better waterproofing can be achieved.

[0068] In one embodiment, the outer shell 1 has a mounting side that fits against the surface of the object to be mounted, and the outer shell 1 is provided with a receiving groove 113 located on the mounting side, and the venting groove 111 is disposed in the receiving groove 113.

[0069] Specifically, the mounted body is the structure used to install and fix the pneumatic level gauge when the pneumatic level gauge of this embodiment is applied. For example, when the pneumatic level gauge is used to detect the liquid level in the medicine tank, the mounted body is the medicine tank. Usually, an installation port is provided on the top of the medicine tank, and the outer shell 1 of the pneumatic level gauge is fixed to the installation port. The air guide tube connected to it extends into the bottom of the medicine tank through the installation port.

[0070] The mounting side of the outer casing 1 is provided with a receiving groove 113. That is, when the outer casing 1 is installed onto the object to be mounted, a protective space is formed between the groove wall of the receiving groove 113 and the object to be mounted. The venting groove 111 is set in the receiving groove 113, that is, the venting narrow channel 13 is located exactly within this protective space. This protective space provides an additional barrier for the venting narrow channel 13, preventing external liquids, dust or other impurities from directly contacting the venting narrow channel 13, thereby improving the overall protective performance of the equipment. Based on this, the structure of the receiving groove 113 can be used to resist conventional rain, splashes and washing scenarios to achieve waterproofing, because external water needs to enter the receiving groove 113 first before entering through the second vent of the venting narrow channel 13. Based on this, the air pressure level gauge of this embodiment also has the advantage of being easy to use. Specifically, since the ventilated narrow channel 13 does not need to be waterproofed in normal water-related scenarios, the ventilated narrow channel 13 will not enter water under normal circumstances. Users do not need to frequently disassemble the ventilated narrow channel 13 to drain water. The ventilated narrow channel 13 is only needed to be waterproofed when the water is submerged.

[0071] In one embodiment, reference is made to Figure 7 The outer casing 1 is provided with a third vent 115 located on the mounting side, and the third vent 115 is used to connect the receiving groove 113 with the atmosphere.

[0072] The main function of the third vent 115 is to connect the receiving groove 113 with the atmosphere. This means that when the outer shell 1 is installed on the object to be installed (such as a medicine tank), the inside of the receiving groove 113 is not completely sealed, but can exchange gas with the external environment through the third vent 115, so as to realize the function of connecting the device mounting cavity 14 with the atmosphere and meet the needs of the pressure sensor 3 to detect atmospheric pressure.

[0073] In one embodiment, a fixing plate 5 is installed in the receiving groove 113, and the fixing plate 5 supports the cover 4 so that the cover 4 keeps tightly covering the venting groove 111.

[0074] Specifically, to improve sealing performance, the cover 4 is preferably made of a flexible material, such as rubber or silicone, which can make close contact with the outer shell 1 to form a breathable narrow channel 13.

[0075] The flexible cover 4 is difficult to fix and has poor reliability after fixing. On this basis, with the support of the fixing plate 5, the cover 4 can maintain a tight seal on the venting groove 111. This tight seal not only prevents external liquids, dust and other impurities from entering the venting channel 13, but also ensures the integrity and effectiveness of the gas flow path inside the venting channel 13.

[0076] In one embodiment, the inner sidewall of the receiving groove 113 is provided with a first locking block 114, which locks the fixing plate 5 so that the fixing plate 5 maintains support for the cover 4.

[0077] The first locking block 114 securely fixes the fixed plate 5 to the inner wall of the receiving groove 113 by clamping it. This clamping mechanism prevents the fixed plate 5 from moving or falling off due to vibration or external force during the operation of the pressure level gauge, thus ensuring the stability and reliability of its supporting function. The design of the first locking block 114 also simplifies the installation process of the fixed plate 5. During installation, simply place the fixed plate 5 in the receiving groove 113 and align or misalign it with the first locking block 114. Then, the fixed plate 5 can be fixed by simple operations (such as pressing, rotating, etc.). No parts such as screws are required for fixing during installation.

[0078] In one embodiment, the receiving groove 113 is a cylindrical groove, and a plurality of first locking blocks 114 are spaced apart inside it; the fixing plate 5 is correspondingly configured as a cylindrical plate, and a plurality of second locking blocks 51 corresponding to the first locking blocks are arranged on its outer periphery. The first locking blocks 114 and the second locking blocks 51 cooperate to lock the fixing plate 5, and the first locking blocks 114 and the second locking blocks 51 can be unlocked or locked by rotating the fixing plate 5.

[0079] By rotating the fixed tray 5, the first locking block 114 and the second locking block 51 can be easily unlocked or locked. This design not only simplifies the operation process but also improves the convenience and flexibility of operation. When it is necessary to disassemble the fixed tray 5, simply rotate the fixed tray 5 to remove it from the receiving groove 113. When installing, simply place the fixed tray 5 into the receiving groove 113 and rotate it to the appropriate position.

[0080] Preferably, for ease of installation, the edges of the first locking block 114 and / or the second locking block 51 are provided with inclined surfaces that have a guiding function, so that the second locking block 51 can be guided to the side of the first locking block 114 that is close to the cover member 4 during rotation.

[0081] In one embodiment, the fixed support plate 5 is provided with a handle 52, through which the fixed support plate 5 can be rotated.

[0082] The handle 52 allows the user to more easily twist the fixed tray 5.

[0083] In one embodiment, the device mounting cavity 14 is divided into an independent first sensing air chamber 141, and the first vent 112 communicates with the first sensing air chamber 141; the pressure sensor 3 is installed in the first sensing air chamber 141, and the pressure sensor 3 includes a first sensitive element for sensing the internal pressure of the first sensing air chamber 141.

[0084] Specifically, in the event of water immersion, external water enters the venting channel 13 through the second vent and forms a water column within it. The deeper the immersion, the greater the external water pressure, and the greater the counter-pressure required within the device mounting cavity 14. Therefore, the water column needs to exert a greater degree of compression. It can be understood that the larger the volume of the device mounting cavity 14, the more gas needs to be compressed to achieve the same pressure increase; that is, the longer the water column needs to be. Generally, control circuit boards and other components are also installed within the device mounting cavity 14, which limits the space available for it. Therefore, extending the venting channel 13 is one way to improve deep-water resistance. However, the space available for the venting channel 13 on the outer casing 1 is limited, making it difficult to create a very long venting channel 13 to provide sufficient waterproofing.

[0085] To this end, this solution is further optimized by separating a first sensing chamber 141 within the device mounting cavity 14 to separately accommodate the pressure sensor 3. The first sensing chamber 141 is a portion separated from the device mounting cavity 14, so its volume is obviously smaller than the entire device mounting cavity 14. The pressure sensor 3 is installed in the first sensing chamber 141, and the first sensitive element therein can just sense the air pressure of the first sensing chamber 141. Moreover, the first vent 112 is connected to the first sensing chamber 141, so that when water enters, the water column in the venting channel 13 only needs to compress the air in the first sensing chamber 141. Compared to compressing the entire device mounting cavity 14, it is easier to compress the air in the smaller first sensor to a sufficient pressure. Therefore, based on this improvement, even with a shorter venting channel 13, good deep-water resistance can still be achieved.

[0086] In one embodiment, combined with Figures 3-4 The outer casing 1 has an air chamber groove 117 located on one side of the device mounting cavity 14. The main control circuit board 2 is installed in the device mounting cavity 14. The main control circuit board 2 covers the air chamber groove 117 to separate the first sensing air chamber 141.

[0087] As one of the core components of the pneumatic level gauge, the main control circuit board 2 is not only responsible for controlling the operation and data processing of the entire device, but also plays a role in separating the space in this design. The main control circuit board 2 is installed inside the device mounting cavity 14, and its position is cleverly arranged to cover the air chamber slot 117. Thus, the main control circuit board 2 naturally becomes a separator, dividing the device mounting cavity 14 into two parts: one part is the main control circuit board 2 and its surrounding area, used to install other necessary electronic components; the other part is the covered air chamber slot 117, i.e., the first sensing air chamber 141. Based on this, an independent first sensing air chamber 141 is separated using the original components of the pneumatic level gauge without adding extra parts or complex structures, achieving the goal of improving deep-water resistance and waterproofing. Therefore, this solution has the advantages of simple structure and low cost.

[0088] In one embodiment, the outer casing 1 includes a casing base 11 and a casing top cover 12, the casing top cover 12 covering the casing base 11 to form the device mounting cavity 14 between the casing base 11 and the casing top cover 12; the air chamber groove 117 is disposed on the casing base 11, and the main control circuit board 2 is fixed on the casing base 11.

[0089] The outer casing 1 consists of two parts: a base 11 and a top cover 12. The base 11 serves as a support and fixing structure, on which various electronic components and parts can be mounted. The top cover 12 covers the base 11 and is tightly connected to it via a sealing connection (such as screws, clips, or glue), thus forming a relatively enclosed space, namely the device mounting cavity 14. An air chamber slot 117 is provided on the base 11, enabling the mounting of the pressure sensor 3 onto the base 11, allowing it to be directly aligned with the connector 116 on the base 11, thus enabling the pressure sensor 3 to detect atmospheric pressure and liquid side pressure. The main control circuit board 2 is fixedly mounted on the base 11, naturally serving to separate the first sensing air chamber 141 from the device mounting cavity 14.

[0090] In one embodiment, a first airtight ring 21 is provided between the main control circuit board 2 and the housing base 11, surrounding the air chamber groove 117.

[0091] By introducing the first airtight ring 21, the contact surface between the main control circuit board 2 and the housing base 11 is better sealed, thereby improving the airtightness of the first sensing air chamber 141.

[0092] In one embodiment, reference is made to Figure 6 The shell base 11 is provided with a support boss 118 surrounding the air chamber groove 117. The support boss 118 is provided with an airtight groove, and the first airtight ring 21 is embedded in the airtight groove.

[0093] The combined design of the support boss 118 and the airtight groove allows the first airtight ring 21 to be partially embedded in the airtight groove and supported and fixed by the support boss 118, thereby improving the reliability of the installation of the first airtight ring 21. In addition, it can also make the sealing effect of the first airtight ring 21 more significant.

[0094] Preferably, multiple circuit board mounting platforms 119 are arranged in an array on the housing base 11. The circuit board mounting platforms 119 are provided with threaded holes. After the main control circuit board 2 is installed on the circuit board mounting platform 119, screws are installed to fix it. In this way, the main control circuit board 2 can be reliably installed, so that the main control circuit board 2 can be in close contact with the first airtight ring 21.

[0095] In one embodiment, the shell base 11 has a connector 116 for connecting an air duct protruding from the side facing away from the shell cover 12. The first vent 112 is located on the shell base 11 and is disposed away from the connector 116. The air chamber groove 117 includes a sensor mounting area 1171 and a bypass narrow air passage 1172. The sensor mounting area 1171 is disposed corresponding to the connector 116. The bypass narrow air passage 1172 connects the sensor mounting area and the first vent.

[0096] The air chamber slot 117 is configured into two parts: a sensor mounting area 1171 and a bypass narrow air channel 1172. The air pressure sensor 3 is installed in the sensor mounting area 1171, so that its sensor tube can be directly aligned with the second sensing air chamber 1161 in the connector 116, which facilitates the installation of the air pressure sensor 3. In addition, the bypass narrow air channel 1172 is used to connect the first vent to the sensor mounting area 1171, so that the sensor mounting area 1171 can be connected to the venting narrow channel 13, realizing the function of the air pressure sensor 3 sensing atmospheric pressure. This structure can reduce the volume of the entire first sensing air chamber 141 to the greatest extent while meeting the ventilation requirements, thereby achieving the purpose of improving the deep water resistance and waterproof capability.

[0097] In one embodiment, the pneumatic level gauge is used in the pesticide tank of a plant protection device.

[0098] In the field of plant protection equipment, such as pesticide spraying equipment, a pressure level gauge is installed in the pesticide tank to detect the pesticide level. In case of rain, accidental water damage, or manual cleaning, even if water enters the venting channel 13 through the second vent, the surface tension of the water will quickly form a water column within the venting channel 13, preventing further water from entering the device mounting cavity 14, thus achieving automatic waterproofing. Therefore, the pressure level gauge with excellent waterproofing capabilities in this solution has a more significant advantage in pesticide tank applications.

[0099] On the other hand, this embodiment also provides a liquid storage device, including a liquid storage tank and the above-mentioned pneumatic level gauge. The housing 1 of the pneumatic level gauge is installed on the top of the liquid storage tank, and the end of the air guide tube of the pneumatic level gauge away from the housing 1 extends to the bottom of the liquid storage tank.

[0100] Similarly, based on the pneumatic level gauge of this embodiment, the liquid storage device of this embodiment has the advantages of strong waterproof capability and long service life.

[0101] On another aspect, this embodiment also provides a plant protection device, including a carrier, a spraying system and the aforementioned liquid storage device. The spraying system and the liquid storage device are installed on the carrier, and the spraying system is used to pump out the liquid from the liquid storage device and perform atomized spraying.

[0102] The vehicle can be an unmanned vehicle, a drone, or a manually driven vehicle.

[0103] The spraying system includes a pumping device and an atomizer. Pipes at both ends of the pumping device are connected to a storage tank and an atomizer, respectively. The pumping device pumps the pesticide solution from the storage tank, which is then atomized by the atomizer and sprayed evenly onto the crops. Mobile spraying operations can be achieved through the use of a vehicle.

[0104] Based on the liquid storage device of this embodiment, similarly, the liquid storage device in the plant protection equipment of this embodiment has the advantages of strong waterproof ability and long service life.

[0105] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0106] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0107] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0108] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A pneumatic level gauge, characterized in that, include: The outer shell (1) has a device mounting cavity (14) inside. The outer shell (1) has a vent groove (111) and a first vent hole (112) that connects the vent groove (111) and the device mounting cavity (14). A pressure sensor (3) is installed inside the device mounting cavity (14); A cover (4) is installed on the outer shell (1) and covers the vent groove (111). The cover (4) and the groove wall of the vent groove (111) form a venting narrow channel (13). The side wall of the vent groove (111) or the cover (4) is provided with a second vent hole that communicates with the venting narrow channel (13). The device mounting cavity (14) communicates with the atmosphere through the venting narrow channel (13) and the second vent hole.

2. The pneumatic level gauge according to claim 1, characterized in that, The first vent (112) and the second vent are respectively disposed at both ends of the venting channel (13).

3. The pneumatic level gauge according to claim 1, characterized in that, The width or height of the ventilated narrow channel (13) shall not exceed 3 mm.

4. The pneumatic level gauge according to claim 1, characterized in that, The cover (4) includes a cover plate (41) and a rib (42) protruding from one side of the cover plate (41). The rib (42) is configured to correspond to the shape of the ventilation groove (111). The cover plate (41) covers the outer shell (1). The rib (42) is embedded in the ventilation groove (111). The surface of the rib (42) and the groove arm of the ventilation groove (111) enclose each other to form the ventilation narrow channel (13).

5. The pneumatic level gauge according to claim 1, characterized in that, The outer shell (1) has a connector (116) protruding on one side for connecting the air duct, and the air vent (111) is arranged in a spiral around the connector (116).

6. The pneumatic level gauge according to claim 1, characterized in that, The outer casing (1) has an installation side that fits against the surface of the object to be installed. The outer casing (1) is provided with a receiving groove (113) located on the installation side, and the ventilation groove (111) is disposed in the receiving groove (113).

7. The pneumatic level gauge according to claim 6, characterized in that, The outer casing (1) is provided with a third vent (115) located on the mounting side, the third vent (115) being used to connect the receiving groove (113) to the atmosphere.

8. The pneumatic level gauge according to claim 6, characterized in that, A fixed support plate (5) is installed in the receiving groove (113). The fixed support plate (5) supports the cover (4) so ​​that the cover (4) keeps tightly covering the venting groove (111).

9. The pneumatic level gauge according to claim 8, characterized in that, The inner wall of the receiving groove (113) is provided with a first locking block (114), which locks the fixed support plate (5) so that the fixed support plate (5) maintains support for the cover (4).

10. The pneumatic level gauge according to claim 9, characterized in that, The receiving groove (113) is a cylindrical groove, and a plurality of first locking blocks (114) are spaced apart inside it; the fixed plate (5) is correspondingly set as a cylindrical plate, and a plurality of second locking blocks (51) corresponding to the first locking blocks (114) are arranged on its outer periphery. The first locking blocks (114) and the second locking blocks (51) cooperate to lock the fixed plate (5), and the first locking blocks (114) and the second locking blocks (51) can be unlocked or locked by rotating the fixed plate (5).

11. The pneumatic level gauge according to claim 10, characterized in that, The fixed support plate (5) is provided with a handle (52), through which the fixed support plate (5) can be rotated.

12. The pneumatic level gauge according to claim 1, characterized in that, The device mounting cavity (14) is divided into an independent first sensing air chamber (141), and the first vent (112) is connected to the first sensing air chamber (141); the air pressure sensor (3) is installed in the first sensing air chamber (141), and the air pressure sensor (3) includes a first sensitive element for sensing the internal air pressure of the first sensing air chamber (141).

13. The pneumatic level gauge according to claim 12, characterized in that, The housing (1) has an air chamber groove (117) located on one side of the device mounting cavity (14). The device mounting cavity (14) is equipped with a main control circuit board (2). The main control circuit board (2) covers the air chamber groove (117) to separate the first sensing air chamber (141).

14. The pneumatic level gauge according to claim 13, characterized in that, The outer casing (1) includes a casing base (11) and a casing top cover (12). The casing top cover (12) covers the casing base (11) to form the device mounting cavity (14) between the casing base (11) and the casing top cover (12). The air chamber groove (117) is disposed on the casing base (11), and the main control circuit board (2) is fixed on the casing base (11).

15. The pneumatic level gauge according to claim 14, characterized in that, A first airtight ring (21) is provided between the main control circuit board (2) and the housing base (11) and surrounding the air chamber groove (117).

16. The pneumatic level gauge according to claim 15, characterized in that, The shell base (11) is provided with a support boss (118) surrounding the air chamber groove (117), the support boss (118) is provided with an airtight groove, and the first airtight ring (21) is embedded in the airtight groove.

17. The pneumatic level gauge according to claim 16, characterized in that, The shell base (11) has a connector (116) for connecting the air duct on the side facing away from the shell cover (12). The first vent (112) is located on the shell base (11) and is arranged away from the connector (116). The air chamber groove (117) includes a sensor mounting area (1171) and a bypass narrow air passage (1172). The sensor mounting area (1171) is arranged corresponding to the connector (116). The bypass narrow air passage (1172) connects the sensor mounting area and the first vent.

18. The pneumatic level gauge according to claim 1, characterized in that, The pressure level gauge is used in the pesticide tank of plant protection equipment.

19. A liquid storage device, characterized in that, The device includes a liquid storage tank and a pneumatic level gauge as described in any one of claims 1-18, wherein the housing (1) of the pneumatic level gauge is mounted on the top of the liquid storage tank, and the end of the pneumatic level gauge's air guide tube away from the housing (1) extends to the bottom of the liquid storage tank.

20. A crop protection device, characterized in that, The device includes a carrier, a spraying system, and a liquid storage device as described in claim 19, wherein the spraying system and the liquid storage device are mounted on the carrier, and the spraying system is used to pump out the liquid medicine from the liquid storage device and spray it in an atomized manner.

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