Residual liquid amount measuring structure and liquid spraying device

Abstract

The utility model provides a residual liquid amount measuring structure and a liquid spraying device, the residual liquid amount measuring structure comprises a communication pipeline and a barometer, the communication pipeline is provided with a liquid inlet and a liquid outlet, the liquid inlet is used for being communicated with the bottom of a water tank, the communication pipeline is provided with an air pressure measuring port, and the air pressure measuring port is located between the liquid inlet and the liquid outlet; the communicating pipeline is provided with a driving pump and an opening and closing device, the opening and closing device is located between the liquid outlet and the air pressure measuring port, and the opening and closing device is used for opening or closing the communicating pipeline; when the opening and closing device closes the communicating pipeline, the air pressure measuring port is communicated with the liquid inlet; the barometer is located on the upper side of the air pressure measuring port and communicated with the air pressure measuring port through an air pipe so as to calculate the residual liquid amount of the water tank according to the measured value of the barometer. The barometer can measure the hydraulic pressure at the bottom of the water tank and calculate the depth of the residual liquid in the water tank, so that the amount of the residual liquid in the water tank can be calculated through the barometer.

Description

TECHNICAL FIELD

[0001] The utility model embodiment relates to aquatic product breeding equipment technical field, especially a kind of residual liquid quantity measurement structure and liquid spraying device. BACKGROUND

[0002] Liquid spraying device is a kind of electric mechanical device for atomizing and spraying liquid in water tank, which is widely used in aquatic product breeding, agriculture, environmental protection and other fields, such as spraying water quality modifier into pond. Liquid spraying device is usually composed of water tank, water pump, nozzle and power supply, and liquid is sprayed out of water tank through nozzle by driving water pump when spraying.

[0003] In the spraying process of liquid spraying device, the spraying speed is often adjusted according to the operation requirement to realize uniform spraying in target spraying area. In order to realize uniform spraying, liquid spraying device needs to measure the residual water quantity in water tank in real time, and adjust the spraying speed in real time according to the residual water quantity and residual spraying area to avoid too fast or too slow spraying, which causes uneven spraying in different areas. The current liquid spraying device mainly measures the residual water quantity in water tank by the following three schemes.

[0004] Scheme one, manual judgment and adjustment

[0005] The most common spraying speed adjustment device is manually controlled, and the liquid spraying device using this scheme uses transparent or translucent water tank, and the operator can observe the residual water quantity in water tank at any time, and adjusts the spraying speed according to experience to realize more uniform spraying. This scheme needs experienced operators to adjust in real time, and cannot realize automatic liquid spraying. In addition, since the spraying quantity and spraying area of different spraying operations are also very different, manual judgment is still prone to inaccurate judgment.

[0006] Scheme two, weighing liquid spraying device

[0007] In order to measure the residual water quantity in water tank in real time to automatically adjust the spraying speed according to the residual water quantity, another scheme is to install electronic scale under water tank to weigh the residual water quantity in real time, and the residual water quantity in water tank can be obtained after deducting the weight of water tank, and the spraying speed can be adjusted according to the residual water quantity. This scheme can obtain more accurate residual water quantity, but has great limitation on use scene. The electronic scale needs to be installed horizontally on fixed plane, and cannot be disturbed by external force. For automatic spraying scene, such as device that needs to be carried or moved, there may not be suitable plane to install electronic scale and other weighing devices. In addition, installing weighing device outside water tank will lead to more complex structure and higher cost of liquid spraying device.

[0008] Scheme three, using flow meter to count water quantity

[0009] In order to measure the residual water in the water tank in real time, there is also a scheme of installing a flow meter on the water outlet pipe connected with the water pump. The scheme can measure the water flow through the water pipe in real time, and the total amount of the liquid that has been sprayed can be obtained by accumulation. If the total amount of water in the water tank is input in advance, the residual water in the water tank can be calculated. The scheme has a simple structure and is suitable for a wide range of scenes. However, the flow meter has a large cumulative error, and it is easy to cause blockage and large measurement error for turbid liquid, so the use scene is also greatly limited. Content of the utility model

[0010] The purpose of the embodiment of the utility model is to provide a residual liquid amount measurement structure and a liquid spraying device, which can estimate the residual liquid amount of the water tank in the liquid spraying device in real time and will not cause cumulative error.

[0011] To solve the above technical problems, the embodiment of the utility model provides a residual liquid amount measurement structure for a liquid spraying device, which comprises:

[0012] A communication pipeline is provided with a liquid inlet and a liquid outlet at both ends, the liquid inlet is used to communicate with the bottom of the water tank in the liquid spraying device, the communication pipeline is provided with an upward gas pressure measuring port, and the gas pressure measuring port is located between the liquid inlet and the liquid outlet; a driving pump is arranged on the communication pipeline, an opening and closing device is arranged on the communication pipeline, the opening and closing device is located between the liquid outlet and the gas pressure measuring port, and the opening and closing device is used to open or close the communication pipeline; when the opening and closing device closes the communication pipeline, the gas pressure measuring port communicates with the liquid inlet;

[0013] A gas pressure meter is located on the upper side of the gas pressure measuring port, and the gas pressure meter communicates with the gas pressure measuring port through a gas pipe to calculate the residual liquid amount of the water tank according to the measurement value of the gas pressure meter.

[0014] Preferably, the communication pipeline comprises:

[0015] A pipe joint is provided with a joint inlet, a joint outlet and the gas pressure measuring port, the joint inlet and the joint outlet are oppositely arranged in the horizontal direction, and the gas pressure measuring port is located between the joint inlet and the joint outlet;

[0016] A liquid inlet pipeline is communicated with the joint inlet at one end, and the liquid inlet is arranged on the end of the liquid inlet pipeline away from the pipe joint;

[0017] A liquid outlet pipeline, one end of the liquid outlet pipeline is communicated with the joint outlet, and the liquid outlet pipeline is provided with the liquid outlet at the end away from the pipe joint, and the opening and closing device is arranged on the liquid outlet pipeline.

[0018] Preferably, the pipe joint comprises:

[0019] A horizontal pipeline, the horizontal pipeline is arranged along the horizontal direction, and the horizontal pipeline is provided with the joint inlet and the joint outlet at two ends thereof;

[0020] A vertical pipeline, the vertical pipeline is arranged along the vertical direction, the lower end of the vertical pipeline is communicated with the middle part of the horizontal pipeline, and the upper end of the vertical pipeline is provided with the air pressure measuring port.

[0021] Preferably, the pipe joint is located at the upper side or the lower side of the water tank.

[0022] Preferably, the air pipe is arranged along the vertical direction, and / or the inner diameter of the air pipe is not greater than 10 mm.

[0023] Preferably, the driving pump is a self-priming pump, the self-priming pump is located between the liquid outlet and the air pressure measuring port, and the self-priming pump forms the opening and closing device; or,

[0024] The driving pump is located between the liquid inlet and the air pressure measuring port, and the opening and closing device is an electromagnetic valve.

[0025] Preferably, the self-priming pump is a diaphragm pump.

[0026] Preferably, the remaining liquid amount measuring structure further comprises a main control circuit, the main control circuit is electrically connected with the air pressure gauge, and the main control circuit is used for calculating the remaining liquid amount of the water tank according to the measurement value of the air pressure gauge.

[0027] Preferably, the main control circuit is electrically connected with the driving pump and / or the opening and closing device, and the main control circuit is used for judging the working state of the driving pump and / or the opening and closing device according to the measurement value of the air pressure gauge.

[0028] In order to achieve the above-mentioned purpose, the utility model still provides a liquid spraying device, including above-remaining liquid amount measuring structure.

[0029] Compared with the prior art, the utility model has the advantages of:

[0030] The utility model discloses a remaining liquid quantity measurement structure, including water tank, drive pump, open -and -close device, electromagnetic valve, air pressure gauge, air pipe, nozzle, the communication pipeline of remaining liquid quantity measurement structure, the liquid inlet of communication pipeline is connected with water tank bottom, and the air pressure measurement mouth of communication pipeline is connected with air pressure gauge through air pipe, and the liquid pressure of water tank bottom can be measured through air pressure gauge, and because the fixed ratio relation exists between the liquid pressure of water tank bottom and the liquid depth in water tank, so the depth of the remaining liquid in water tank can be calculated according to the measured value of air pressure gauge, and the remaining liquid quantity of water tank can be calculated through air pressure gauge, and the cumulative error can not be produced, and the structure of remaining liquid quantity measurement structure is simple, realizes low, can be matched with any water tank, and installation is flexible and does not need special plane. BRIEF DESCRIPTION OF DRAWINGS

[0031] One or more embodiments are illustrated by way of example in the figures that form a part of this disclosure and which are illustrative of various embodiments and implementations that can be implemented in connection with the embodiments. Like reference numbers in the figures indicate like elements unless otherwise specified.

[0032] Figure 1 It is a structure schematic view of remaining liquid quantity measurement structure in the first embodiment of the utility model;

[0033] Figure 2 It is a structure schematic view of remaining liquid quantity measurement structure in the second embodiment of the utility model;

[0034] Figure 3 It is a structure schematic view of remaining liquid quantity measurement structure in the third embodiment of the utility model.

[0035] The utility model drawing label explanation:

[0036] Remaining liquid quantity measurement structure 100, communication pipeline 1, liquid inlet 11, liquid outlet 12, air pressure measurement mouth 13, pipe joint 14, liquid inlet pipeline 15, liquid outlet pipeline 16, water tank 2, drive pump 3, open -and -close device 4, electromagnetic valve 4a, air pressure gauge 5, air pipe 6, nozzle 7.

[0037] The utility model discloses the realization, functional characteristics and advantages will be further explained with reference to the embodiment. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0039] It should be noted that if the embodiments of the utility model have directionality indication (such as up, down, left, right, front, back), the directionality indication is only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), if the specific posture changes, then the directionality indication also changes accordingly.

[0040] In addition, if the embodiments of the utility model have the description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one feature. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0041] The utility model provides a kind of remaining liquid quantity measurement structure, which can be used for various liquid spraying devices, to realize the automatic adjustment of the spraying speed of liquid spraying device, Figure 1 The first embodiment of the remaining liquid quantity measurement structure provided by the utility model is shown, Figure 2 The second embodiment of the remaining liquid quantity measurement structure provided by the utility model is shown, Figure 3 The third embodiment of the remaining liquid quantity measurement structure provided by the utility model is shown.

[0042] Please refer to Figure 1 In the first embodiment, the remaining liquid quantity measurement structure 100 includes a communication pipeline 1 and a barometer 5, the two ends of the communication pipeline 1 are provided with a liquid inlet 11 and a liquid outlet 12, the liquid inlet 11 is used to communicate with the bottom of the water tank 2 in the liquid spraying device, the communication pipeline 1 is provided with an upward gas pressure measuring port 13, and the gas pressure measuring port 13 is located between the liquid inlet 11 and the liquid outlet 12; The communication pipeline 1 is provided with a driving pump 3, and the communication pipeline 1 is provided with an opening and closing device 4, and the opening and closing device 4 is located between the liquid outlet 12 and the gas pressure measuring port 13, and the opening and closing device 4 is used to open or close the communication pipeline 1; When the opening and closing device 4 closes the communication pipeline 1, the gas pressure measuring port 13 communicates with the liquid inlet 11; The barometer 5 is located on the upper side of the gas pressure measuring port 13, and the barometer 5 communicates with the gas pressure measuring port 13 through the air pipe 6, so as to calculate the remaining liquid quantity of the water tank 2 according to the measurement value of the barometer 5.

[0043] Specifically, the water tank 2 can belong to the part of the residual liquid amount measuring structure 100, that is, the residual liquid amount measuring structure 100 includes the water tank 2; the water tank 2 can also not belong to the part of the residual liquid amount measuring structure 100, that is, the residual liquid amount measuring structure 100 does not include the water tank 2, which will be introduced below with the residual liquid amount measuring structure 100 including the water tank 2 as an example. The outer size of the water tank 2 is fixed and known, and the specific outer shape of the water tank 2 can be set according to the actual situation. Optionally, please refer to Figure 1 In the first embodiment, the water tank 2 is a square water tank, which will be introduced below with the water tank 2 as a square water tank as an example.

[0044] The water tank 2 is used to hold the liquid to be sprayed, and the water tank 2 is provided with a water tank outlet at the bottom. The liquid in the water tank 2 can be discharged from the water tank outlet. The water tank outlet can be provided on the side wall of the water tank 2; the water tank outlet can also be provided on the bottom wall of the water tank 2. Optionally, please refer to Figure 1 In the first embodiment, the water tank 2 is provided with a downward water tank outlet on the bottom wall, which will be introduced below with the water tank outlet provided on the bottom wall of the water tank 2 as an example.

[0045] The communication pipeline 1 is provided with a liquid inlet 11, a liquid outlet 12 and a gas pressure measuring port 13. The liquid inlet 11 is located at the gas pressure measuring port 13, and the liquid outlet 12 is located at the rear side of the gas pressure measuring port 13. The liquid inlet 11 communicates with the bottom of the water tank 2, so that the liquid in the water tank 2 can enter the communication pipeline 1 from the liquid inlet 11. The gas pressure measuring port 13 is arranged in an up-down interval with the water tank 2, and the up-down interval between the gas pressure measuring port 13 and the water tank 2 is a preset interval value, that is, the setting position of the gas pressure measuring port 13 is fixed and known relative to the height of the water tank 2.

[0046] The communication pipeline 1 is provided with a driving pump 3, which can drive the liquid in the communication pipeline 1 to flow from the liquid inlet 11 to the liquid outlet 12. The driving pump 3 can be arranged between the liquid inlet 11 and the gas pressure measuring port 13, that is, the driving pump 3 is located at the front side of the gas pressure measuring port 13; the driving pump 3 can also be arranged between the liquid outlet 12 and the gas pressure measuring port 13, that is, the driving pump 3 is located at the rear side of the gas pressure measuring port 13. And when the liquid in the communication pipeline 1 does not flow, that is, the driving pump 3 does not work, the pipeline between the liquid inlet 11 and the gas pressure measuring port 13 is in a communication state (no closed valve can be arranged in the middle).

[0047] The communication pipeline 1 is provided with an opening and closing device 4, which is located between the liquid outlet 12 and the gas pressure measuring port 13, that is, the opening and closing device 4 is located at the rear side of the gas pressure measuring port 13. The opening and closing device 4 can open and close the pipeline at the rear side of the gas pressure measuring port 13.

[0048] The air pressure gauge 5 is located on the upper side of the air pressure measuring port 13, and the interface of the air pressure gauge 5 is communicated with the air pressure measuring port 13 through the air pipe 6, so that the U-shaped pipe communicating vessel structure is formed between the air pressure gauge 5 and the water tank 2, and then the liquid pressure at the bottom of the water tank 2 can be measured through the air pressure gauge 5. Since the liquid pressure at the bottom of the water tank 2 has a fixed ratio relationship with the depth of the liquid in the water tank 2, the depth of the remaining liquid in the water tank 2 can be calculated according to the measurement value of the air pressure gauge 5, so that the remaining liquid amount of the water tank 2 can be calculated through the air pressure gauge 5. The remaining liquid amount of the water tank 2 can be the remaining liquid depth of the water tank 2, and the remaining liquid amount of the water tank 2 can also be the remaining liquid volume of the water tank 2. The remaining liquid amount of the water tank 2 will be taken as an example to be introduced below.

[0049] After the depth of the remaining liquid in the water tank 2 is calculated according to the measurement value of the air pressure gauge 5, since the size of the water tank 2 is known, the remaining liquid amount of the water tank 2 can be calculated through the liquid pressure measured by the air pressure gauge 5.

[0050] The liquid inlet 11 of the communicating pipeline 1 in the remaining liquid amount measuring structure 100 is communicated with the bottom of the water tank 2, the air pressure measuring port 13 of the communicating pipeline 1 is communicated with the air pressure gauge 5 through the air pipe 6, so that the liquid pressure at the bottom of the water tank 2 can be measured through the air pressure gauge 5. Since the liquid pressure at the bottom of the water tank 2 has a fixed ratio relationship with the depth of the liquid in the water tank 2, the depth of the remaining liquid in the water tank 2 can be calculated according to the measurement value of the air pressure gauge 5, so that the remaining liquid amount of the water tank 2 can be calculated through the air pressure gauge 5, and no cumulative error is generated. The structure of the remaining liquid amount measuring structure 100 is simple, the implementation cost is low, the remaining liquid amount measuring structure 100 can be matched with any water tank 2, and the installation is flexible and does not require a special plane.

[0051] The specific shape of the air pipe 6 can be set according to the actual situation. Optionally, please refer to Figure 1 In the first embodiment, the air pipe 6 is arranged along the up-down direction, so that the structure of the air pipe 6 is simple.

[0052] The radial size of the air pipe 6 is smaller than the radial size of the communicating pipeline 1, so as to prevent the liquid in the communicating pipeline 1 from flowing into the air pressure gauge 5 through the air pipe 6. Optionally, please refer to Figure 1 In the first embodiment, the inner diameter of the air pipe 6 is not greater than 10 mm. The inner diameter of the air pipe 6 is less than or equal to 10 mm, which is beneficial to prevent the liquid in the communicating pipeline 1 from flowing into the air pressure gauge 5 through the air pipe 6.

[0053] The communicating pipeline 1 is provided with the air pressure measuring port 13. Optionally, please refer to Figure 1In the first embodiment, the communication pipeline 1 comprises a pipe joint 14, a liquid inlet pipeline 15, and a liquid outlet pipeline 16. The pipe joint 14 is provided with a joint inlet, a joint outlet, and a gas pressure measuring port 13. The joint inlet and the joint outlet are oppositely arranged in the horizontal direction. The gas pressure measuring port 13 is located between the joint inlet and the joint outlet. One end of the liquid inlet pipeline 15 is connected to the joint inlet. The liquid inlet pipeline 15 is provided with a liquid inlet 11 at the end away from the pipe joint 14. One end of the liquid outlet pipeline 16 is connected to the joint outlet. The liquid outlet pipeline 16 is provided with a liquid outlet 12 at the end away from the pipe joint 14. The liquid outlet pipeline 16 is provided with an opening and closing device 4.

[0054] Specifically, the distance between the pipe joint 14 and the water tank 2 in the vertical direction is a preset distance value. That is, the installation position of the pipe joint 14 is fixed relative to the height of the water tank 2 and is known. The pipe joint 14 is provided with a joint inlet and a joint outlet. The joint inlet and the joint outlet of the pipe joint 14 are oppositely arranged and are perpendicular or approximately perpendicular to the horizontal direction. The joint inlet of the pipe joint 14 is connected to the water tank outlet of the water tank 2 through the liquid inlet pipeline 15. Optionally, please refer to Figure 1 In the first embodiment, the liquid outlet pipeline 16 is provided with a nozzle 7 at the end away from the pipe joint 14 to form the liquid outlet 12. In this way, the liquid in the water tank 2 can flow through the water tank outlet, the liquid inlet pipeline 15, the pipe joint 14, the liquid outlet pipeline 16, and the nozzle 7 in sequence, so that the liquid is sprayed from the nozzle 7.

[0055] The pipe joint 14 is provided with a gas pressure measuring port 13. The gas pressure measuring port 13 is upwardly arranged and located between the joint inlet and the joint outlet. The diameter of the gas pressure measuring port 13 is generally smaller than the diameters of the joint inlet and the joint outlet. The gas pressure measuring port 13 is located on one side of the water tank 2 in the horizontal direction. In the following, the communication pipeline 1 comprising the pipe joint 14, the liquid inlet pipeline 15, and the liquid outlet pipeline 16 will be introduced.

[0056] The pipe joint 14 has at least three openings, including the joint inlet, the joint outlet, and the gas pressure measuring port 13. Optionally, please refer to Figure 1 In the first embodiment, the pipe joint 14 is a three-way pipe joint.

[0057] The specific shape of the pipe joint 14 can be set according to actual conditions. Optionally, please refer to Figure 1 In the first embodiment, the pipe joint 14 comprises a horizontal pipeline and a vertical pipeline. The horizontal pipeline extends along the horizontal direction. The two ends of the horizontal pipeline are provided with the joint inlet and the joint outlet, respectively. The vertical pipeline extends along the vertical direction. The lower end of the vertical pipeline is connected to the middle part of the horizontal pipeline. The upper end of the vertical pipeline is provided with the gas pressure measuring port 13.

[0058] Specifically, the horizontal pipe is perpendicular or approximately perpendicular to the vertical pipe, and the horizontal pipe is located at the lower side of the water tank 2, and the pipe joint 14 is arranged in such a manner that the structure of the pipe joint 14 is simple.

[0059] Optionally, referring to Figure 1 In the first embodiment, the residual liquid amount measuring structure 100 further comprises a master control circuit (not shown in the figure) electrically connected to the air pressure gauge 5, and the master control circuit is used to calculate the residual liquid amount of the water tank 2 according to the measurement value of the air pressure gauge 5.

[0060] Specifically, the air pressure gauge 5 can be electrically connected to the master control circuit through a wired or wireless manner, for example, the air pressure gauge 5 is connected to the master control circuit through a signal line, and the measurement value of the air pressure gauge 5 can be read by the master control circuit, so that the master control circuit can calculate the residual liquid amount of the water tank 2 according to the measurement value of the air pressure gauge 5.

[0061] The communication pipe 1 is provided with an opening and closing device 4, and the opening and closing device 4 can close the pipe on the rear side of the air pressure measuring port 13. The opening and closing device 4 can be arranged in various manners, and optionally, referring to Figure 1 In the first embodiment, the driving pump 3 is located between the liquid inlet port 11 and the air pressure measuring port 13, and the opening and closing device 4 is an electromagnetic valve 4a.

[0062] Specifically, the driving pump 3 is arranged on the liquid inlet pipe 15, and the driving pump 3 is located on the front side of the air pressure measuring port 13. The driving pump 3 can be a water pump or the like. When the driving pump 3 is not working, the liquid in the liquid inlet pipe 15 can also pass through the driving pump 3. Therefore, when the driving pump 3 is not working, the pipe between the air pressure measuring port 13 and the bottom of the water tank 2 is in a communication state, so as to ensure that the liquid pressure at the air pressure measuring port 13 is consistent with the liquid pressure at the bottom of the water tank 2.

[0063] The electromagnetic valve 4a is arranged on the liquid outlet pipe 16, and the electromagnetic valve 4a can open and close the liquid outlet pipe 16. Therefore, the electromagnetic valve 4a forms the opening and closing device 4.

[0064] Optionally, referring to Figure 2 In the second embodiment, or referring to Figure 3 In the third embodiment, the driving pump 3 is a self-priming pump, and the self-priming pump is located between the liquid outlet port 12 and the air pressure measuring port 13, and the self-priming pump forms the opening and closing device 4.

[0065] Specifically, the driving pump 3 is arranged on the liquid outlet pipe 16, and the driving pump 3 is a self-priming pump that does not leak water when not working, that is, when the driving pump 3 is not working, the liquid in the liquid outlet pipe 16 cannot pass through the driving pump 3. The self-priming pump can open and close the liquid outlet pipe 16, and therefore the self-priming pump forms the opening and closing device 4. The self-priming pump can be a diaphragm pump or the like.

[0066] The pipe joint 14 is arranged vertically spaced apart from the water tank 2. Alternatively, please refer to Figure 1 In the first embodiment, or please refer to Figure 2 In the second embodiment, the pipe joint 14 is located at the lower side of the water tank 2.

[0067] Alternatively, please refer to Figure 3 In the third embodiment, the pipe joint 14 is located at the upper side of the water tank 2.

[0068] The main control circuit is electrically connected to the driving pump 3 and / or the opening and closing device 4, so that the operation of the driving pump 3 and / or the opening and closing device 4 can be controlled by the main control circuit.

[0069] Specifically, when the opening and closing device 4 is the electromagnetic valve 4a, the operation of the driving pump 3 and / or the electromagnetic valve 4a can be controlled by the main control circuit; when the opening and closing device 4 is the self-priming pump (i.e. the driving pump 3), the operation of the driving pump 3 can be controlled by the main control circuit. Hereinafter, the operation of the driving pump 3 and the electromagnetic valve 4a controlled by the main control circuit will be introduced as an example, with the opening and closing device 4 being the electromagnetic valve 4a.

[0070] When the water tank 2 does not contain the liquid to be sprayed, the entire pipeline is in communication with the atmosphere, and at this time the measurement value of the barometer 5 is the standard atmospheric pressure. When the water tank 2 contains the liquid to be sprayed and no spraying is performed, the electromagnetic valve 4a (i.e. the opening and closing device 4) is closed, the pipeline will be filled with the liquid in the water tank 2, and the air pressure in the air pipe 6 will be balanced with the hydraulic pressure in the water tank 2, so the measurement value of the barometer 5 will be equal to the hydraulic pressure at the bottom of the water tank 2. Since there is a fixed ratio relationship between the hydraulic pressure at the bottom of the water tank 2 and the depth of the liquid in the water tank 2, the depth of the remaining liquid in the water tank 2 can be calculated by the measurement value of the barometer 5. Since the outer dimensions of the water tank 2 are known, the remaining liquid volume of the water tank 2 can be calculated by the measurement value of the barometer 5.

[0071] The main control circuit is used to determine the working state of the driving pump 3 and / or the opening and closing device 4 according to the measurement value of the barometer 5.

[0072] Specifically, when the opening and closing device 4 is the electromagnetic valve 4a, the working state of the driving pump 3 and / or the electromagnetic valve 4a can be determined by the main control circuit according to the measurement value of the barometer 5; when the opening and closing device 4 is the self-priming pump (i.e. the driving pump 3), the working state of the driving pump 3 can be determined by the main control circuit according to the measurement value of the barometer 5. Hereinafter, the working state of the driving pump 3 and the electromagnetic valve 4a determined by the main control circuit according to the measurement value of the barometer 5 will be introduced as an example, with the opening and closing device 4 being the electromagnetic valve 4a.

[0073] Specifically, if the measurement value of the air pressure gauge 5 rises by more than the first threshold value when the liquid spraying device is started, it is determined that the water pump 51a is normal; if the measurement value of the air pressure gauge 5 rises by less than the first threshold value when the liquid spraying device is started, it is determined that the water pump 51a is faulty.

[0074] If the measurement value of the air pressure gauge 5 drops by more than the second threshold value after the liquid spraying device is started for a preset length of time, it is determined that the electromagnetic valve 4a is normal; if the measurement value of the air pressure gauge 5 drops by less than the second threshold value after the liquid spraying device is started for a preset length of time, it is determined that the electromagnetic valve 4a is faulty.

[0075] When the liquid spraying device starts to work, the driving pump 3 is opened before the electromagnetic valve 4a, at which time the hydraulic pressure in the pipeline will rise, and after a delay, the electromagnetic valve 4a will also be opened, at which time the hydraulic pressure in the pipeline will drop. During the starting stage of the liquid spraying device, the air pressure measured by the air pressure gauge 5 rises and then drops obviously, and the change in the air pressure can be used to determine whether the driving pump 3 and the electromagnetic valve 4a are faulty. For example, if the hydraulic pressure does not rise after the liquid spraying device is started, and the hydraulic pressure also does not drop after a preset length of time (the normal opening delay of the electromagnetic valve 4a), it indicates that both the driving pump 3 and the electromagnetic valve 4a are faulty; if the hydraulic pressure rises and then does not drop obviously within the preset length of time, it indicates that the electromagnetic valve 4a is damaged and cannot be opened. If the hydraulic pressure does not rise after the liquid spraying device is started, but the hydraulic pressure drops after a period of time (the normal opening delay of the electromagnetic valve 4a), it indicates that the electromagnetic valve 4a is normal, but the driving pump 3 is faulty. If the remaining liquid amount of the water tank 2 needs to be measured during the spraying process, the electromagnetic valve 4a and the driving pump 3 can be closed, the air pressure is measured by the air pressure gauge 5 once, and then the remaining liquid amount of the water tank 2 can be calculated.

[0076] The remaining liquid amount measurement structure 100 can flexibly measure the depth of the remaining liquid in the water tank 2, and the remaining liquid amount of the water tank 2 can be calculated by the depth. The remaining liquid amount measurement structure 100 has a simple structure, low implementation cost, and a pipeline length that can be arbitrarily set. The remaining liquid amount measurement structure 100 can be matched with any water tank 2 and installed flexibly without a special plane. Meanwhile, the remaining liquid amount measurement structure 100 can monitor whether the driving pump 3 and the electromagnetic valve 4a are working normally in real time, and automatic spraying can be realized by a main control circuit.

[0077] The utility model also provides a liquid spraying device, the liquid spraying device includes remaining liquid amount measurement structure, the liquid spraying device is a kind of automatic speed regulation liquid spraying device, since the remaining liquid amount measurement structure has adopted the technical scheme of above-mentioned embodiment, therefore has the beneficial effect brought by the technical scheme of above-mentioned embodiment.

[0078] The liquid spraying device can estimate the residual liquid amount of the water tank 2 in real time through the residual liquid amount measurement structure 100, without accumulated error, and can monitor the working state of the driving pump 3 and the electromagnetic valve 4a in real time, and has a fault detection function.

[0079] The above are only preferred embodiments of the present application, and do not limit the patent range of the present application, and any equivalent structural transformation made under the utility model concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection range of the present application.

Claims

1. A residual liquid amount measuring structure for a liquid spraying device, characterized by, The remaining liquid amount measuring structure comprises: A communication pipeline, two ends of the communication pipeline are respectively provided with a liquid inlet and a liquid outlet, the liquid inlet is used for communicating with the bottom of a water tank in the liquid spraying device, the communication pipeline is provided with an upward air pressure measuring port, the air pressure measuring port is located between the liquid inlet and the liquid outlet; a driving pump is arranged on the communication pipeline, an opening and closing device is arranged on the communication pipeline, the opening and closing device is located between the liquid outlet and the air pressure measuring port, and the opening and closing device is used for opening or closing the communication pipeline; when the opening and closing device closes the communication pipeline, the air pressure measuring port communicates with the liquid inlet; An air pressure gauge, the air pressure gauge is located on the upper side of the air pressure measuring port, and the air pressure gauge communicates with the air pressure measuring port through an air pipe, so as to calculate the remaining liquid amount of the water tank according to the measurement value of the air pressure gauge.

2. The residual liquid level measuring structure of claim 1, wherein The communication pipeline comprises: A pipe joint, the pipe joint is provided with a joint inlet, a joint outlet and the air pressure measuring port, the joint inlet and the joint outlet are oppositely arranged in the horizontal direction, and the air pressure measuring port is located between the joint inlet and the joint outlet; A liquid inlet pipeline, one end of the liquid inlet pipeline communicates with the joint inlet, and the liquid inlet pipeline is provided with the liquid inlet at the end away from the pipe joint; A liquid outlet pipeline, one end of the liquid outlet pipeline communicates with the joint outlet, and the liquid outlet pipeline is provided with the liquid outlet at the end away from the pipe joint, and the opening and closing device is arranged on the liquid outlet pipeline.

3. The residual liquid level measuring structure of claim 2, wherein The pipe joint comprises: A horizontal pipeline, the horizontal pipeline is arranged along the horizontal direction, and two ends of the horizontal pipeline are respectively provided with the joint inlet and the joint outlet; A vertical pipeline, the vertical pipeline is arranged along the up-down direction, the lower end of the vertical pipeline communicates with the middle part of the horizontal pipeline, and the upper end of the vertical pipeline is provided with the air pressure measuring port.

4. The residual liquid level measuring structure of claim 2, wherein The pipe joint is located on the upper side or the lower side of the water tank.

5. The residual liquid level measuring structure of claim 1, wherein The air pipe is arranged along the up-down direction; and / or, the inner diameter of the air pipe is not greater than 10 mm.

6. The remaining liquid level measurement structure of claim 1, wherein, The driving pump is a self-priming pump, the self-priming pump is located between the liquid outlet and the air pressure measuring port, and the self-priming pump forms the opening and closing device; or, The driving pump is located between the liquid inlet and the air pressure measuring port, and the opening and closing device is an electromagnetic valve.

7. The residual liquid level measuring arrangement according to claim 6, characterized in that The self-priming pump is a diaphragm pump.

8. The residual liquid level measuring structure of claim 1, wherein, The remaining liquid amount measuring structure further comprises a main control circuit, the main control circuit is electrically connected with the air pressure gauge, and the main control circuit is used for calculating the remaining liquid amount of the water tank according to the measurement value of the air pressure gauge.

9. The residual liquid level measuring structure of claim 8, wherein The main control circuit is electrically connected with the driving pump and / or the opening and closing device, and the main control circuit is used for judging the working state of the driving pump and / or the opening and closing device according to the measurement value of the air pressure gauge.

10. A liquid spraying device, characterized by The remaining liquid amount measuring structure comprises: The remaining liquid amount measuring structure comprises:

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