Composite sensor and differential pressure type water and fertilizer control system

Abstract

The utility model discloses a composite sensor and a differential pressure type water and fertilizer control system. The composite sensor comprises a device shell; the first detection probe is arranged in the device shell, is partially exposed out of the surface of the device shell, and is used for detecting the conductivity of the liquid; the second detection probe is arranged in the device shell, is partially exposed out of the surface of the device shell, and is used for detecting the pH value of the liquid; the control main board is arranged in the device shell, is electrically connected with the first detection probe and the second detection probe, and is used for acquiring a first measurement signal fed back by the first detection probe and performing first preset signal processing on the first measurement signal to obtain a conductivity measurement result; and acquiring a second measurement signal fed back by the second detection probe, and performing second preset signal processing on the second measurement signal to obtain a pH value measurement result. According to the technical scheme, the fertilization concentration and the fertilization time can be accurately controlled in the differential pressure fertilization process, so that the fertilization effect is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural devices, in particular to a composite sensor and a differential pressure type water and fertilizer control system. BACKGROUND

[0002] Water and fertilizer integration technology, also known as water-saving irrigation and fertilization technology, is a modern advanced agricultural technology developed by combining drip irrigation and fertilization. This technology mainly uses irrigation systems and water in irrigation systems as carriers to fertilize at the same time of irrigation, realizes integrated use and management of water and fertilizer, and supplies water and fertilizer to crops in an optimized combination state for absorption and utilization.

[0003] Water-saving irrigation and fertilization technology is mainly realized through a differential pressure type water and fertilizer control system. In related technologies, the differential pressure type water and fertilizer control system mainly transports the fertilizer solution in the fertilizer tank to the liquid outlet pipe of the main pipe through the fertilizer outlet pipe during differential pressure fertilization to output the fertilizer solution required for fertilization through the liquid outlet pipe. However, it is found in actual use that the existing differential pressure type water and fertilizer control system lacks related structures for accurately monitoring the concentration of the fertilizer solution in the fertilizer outlet pipe, which causes the system to be unable to accurately control the fertilization concentration and fertilization time during differential pressure fertilization, seriously affecting the fertilization effect. CONTENT OF THE INVENTION

[0004] Embodiments of the present application provide a composite sensor and a differential pressure type water and fertilizer control system, aiming to improve the technical problem that the existing differential pressure type water and fertilizer control system lacks related structures for accurately monitoring the concentration of the fertilizer solution in the fertilizer outlet pipe, which causes the system to be unable to accurately control the fertilization concentration and fertilization time during differential pressure fertilization, seriously affecting the fertilization effect.

[0005] To this end, the embodiments of the present application provide a composite sensor, which comprises a device shell, a first detection probe, a second detection probe, and a control mainboard, wherein,

[0006] The first detection probe is built-in in the device shell and partially exposed on the surface of the device shell, and is used for detecting the electrical conductivity of the liquid;

[0007] The second detection probe is built-in in the device shell and partially exposed on the surface of the device shell, and is used for detecting the pH value of the liquid;

[0008] The control mainboard is built-in the device shell and is electrically connected with the first detection probe and the second detection probe respectively, is used for obtaining the first measurement signal fed back by the first detection probe, performing first preset signal processing on the first measurement signal to obtain the conductivity measurement result, and obtaining the second measurement signal fed back by the second detection probe and performing second preset signal processing on the second measurement signal to obtain the pH value measurement result.

[0009] Optionally, in some embodiments of the present application, a connecting portion is arranged around the outer periphery of the first end of the device shell, and the device shell is mounted and connected through the connecting portion.

[0010] Optionally, in some embodiments of the present application, a sealing ring is further arranged around the outer periphery of the first end of the device shell, and the sealing ring is arranged adjacent to the connecting portion to seal the mounting and connection position when the connecting portion is mounted and connected.

[0011] Optionally, in some embodiments of the present application, a first probe hole and a second probe hole are respectively arranged on the end face of the first end of the device shell, part of the first detection probe is exposed to the surface of the device shell through the first probe hole, and part of the second detection probe is exposed to the surface of the device shell through the second probe hole.

[0012] Optionally, in some embodiments of the present application, the control mainboard comprises a communication module, the composite sensor further comprises a connector, the connector is arranged on the second end of the device shell, the inner side of the connector is electrically connected with the communication module, the outer side of the connector is electrically connected with an external circuit, and the connector is used for feeding back the conductivity measurement result and the pH value measurement result obtained by the control mainboard to the external circuit respectively.

[0013] Optionally, in some embodiments of the present application, a protection structure is arranged around the end face of the first end of the device shell, and part of the first detection probe and part of the second detection probe are exposed from the end face of the first end of the device shell and are both within the protection range of the protection structure.

[0014] Optionally, in some embodiments of the present application, the protection structure comprises a plurality of protection protrusions, and the plurality of protection protrusions are arranged at intervals around the end face of the first end of the device shell to surround and protect part of the first detection probe and part of the second detection probe exposed from the end face of the first end of the device shell.

[0015] Optionally, in some embodiments of the present application, a third detection probe is further included, wherein,

[0016] The third detection probe is built-in the device shell and partially exposed on the surface of the device shell for detecting the temperature of the liquid.

[0017] The control mainboard is further electrically connected with the third detection probe, configured to acquire the first measurement signal fed back by the first detection probe and the third measurement signal fed back by the third detection probe, and perform first preset signal processing on the first measurement signal to obtain a conductivity measurement result, and acquire the second measurement signal fed back by the second detection probe and the third measurement signal fed back by the third detection probe, and perform second preset signal processing on the second measurement signal to obtain a pH value measurement result.

[0018] The first preset signal processing includes temperature compensation processing on the first measurement signal according to the third measurement signal, and the second preset signal processing includes temperature compensation processing on the second measurement signal according to the third measurement signal.

[0019] Optionally, in some embodiments of the present application, the end surface of the first end of the device shell is provided with a third probe hole, and part of the third detection probe extends out through the third probe hole to be exposed on the surface of the device shell.

[0020] In addition, the present application also provides a differential pressure type water and fertilizer control system, which comprises a fertilizer storage assembly and a liquid outlet pipeline, the fertilizer storage assembly comprises a fertilizer storage container, a fertilizer outlet pipeline and the composite sensor of any one of the preceding embodiments, the fertilizer outlet pipeline is used to realize the communication between the fertilizer storage container and the liquid outlet pipeline, and the composite sensor is connected with the liquid outlet pipeline and used to detect the conductivity and pH value of the liquid in the fertilizer outlet pipeline.

[0021] Optionally, in some embodiments of the present application, an electric proportional valve and a liquid inlet pipeline are further included, wherein,

[0022] The electric proportional valve is provided with a first liquid inlet and a first liquid outlet.

[0023] The liquid inlet pipeline is in communication with the first liquid inlet.

[0024] The liquid outlet pipeline is in communication with the first liquid outlet and is used to output the liquid required for irrigation or fertilization.

[0025] The fertilizer storage assembly further comprises a fertilizer inlet pipeline provided with a first electric valve, the fertilizer storage container is further provided with a fertilizer inlet and a fertilizer outlet, the fertilizer inlet is in communication with the liquid inlet pipeline through the fertilizer inlet pipeline, and the fertilizer outlet is in communication with the liquid outlet pipeline through the fertilizer outlet pipeline.

[0026] The first electric valve is used for controlling the communication and closing of the fertilizer feeding pipeline; and the electric proportional valve is used for adjusting the opening and closing ratio, so that a pressure difference is formed between the liquid at the first liquid inlet and the first liquid outlet, and the liquid flows from the liquid feeding pipeline to the fertilizer feeding pipeline and enters the fertilizer storage container.

[0027] Optionally, in some embodiments of the present application, a pressure detection assembly is further included, which is arranged adjacent to the first liquid outlet and is used for detecting the liquid pressure at the first liquid outlet.

[0028] Optionally, in some embodiments of the present application, a first control mechanism is further included, which is electrically connected with the pressure detection assembly, the electric proportional valve and the first electric valve respectively, and is used for adjusting the opening and closing ratio of the electric proportional valve and controlling the communication and closing of the first electric valve according to the liquid pressure detected by the pressure detection assembly.

[0029] Optionally, in some embodiments of the present application, the electric proportional valve includes a first valve body and a first valve core, the first valve body is connected with the first control mechanism, the first valve core is arranged inside the first valve body, the first valve core includes a first connecting member, the first control mechanism includes a first driving assembly, the first driving assembly includes a second connecting member, the first connecting member and the second connecting member are connected, and the first driving assembly drives the second connecting member to rotate, so as to drive the first valve core to rotate relative to the first valve body to adjust the opening and closing ratio of the electric proportional valve.

[0030] Optionally, in some embodiments of the present application, two or more than two fertilizer storage assemblies are included, and the pressure difference type water and fertilizer control system further includes a second control mechanism, which is electrically connected with each first electric valve and each composite sensor respectively, and is further used for controlling the communication and closing of each first electric valve according to the electric conductivity detection result and the pH value detection result of each composite sensor.

[0031] Optionally, in some embodiments of the present application, an electric ball valve and a liquid feeding pipeline are further included, wherein,

[0032] The electric ball valve includes a second valve body, a second valve core and a second driving assembly, the second valve body is provided with a second liquid inlet, a second liquid outlet and a communication port, and the communication port is arranged adjacent to the second liquid inlet, the second valve core is built in the second valve body, the second valve core is provided with a third liquid inlet and a third liquid outlet, the third liquid outlet is communicated with the third liquid inlet inside the second valve core, and the second driving assembly is in transmission connection with the second valve core to drive the second valve core to rotate, so that the electric ball valve can be switched between a first state and a second state.

[0033] The liquid inlet pipe is communicated with the second liquid inlet;

[0034] The liquid outlet pipe is communicated with the second liquid outlet, and is used for outputting liquid required for irrigation or fertilization;

[0035] The fertilizer storage assembly further comprises a fertilizer inlet pipe, the fertilizer storage container is further provided with a fertilizer inlet and a fertilizer outlet, the fertilizer inlet is communicated with the communication port through the fertilizer inlet pipe, and the fertilizer outlet is communicated with the liquid outlet pipe through the fertilizer outlet pipe;

[0036] When the electric ball valve is in the first state, the third liquid inlet is communicated with the second liquid inlet, the third liquid outlet is communicated with the second liquid outlet, and the communication ports are all closed; when the electric ball valve is in the second state, the third liquid inlet is simultaneously communicated with the second liquid inlet and the communication ports, the third liquid outlet is communicated with the second liquid outlet, and the second liquid outlet is partially closed.

[0037] Optionally, in some embodiments of the present application, the communication ports comprise first communication ports and second communication ports, and the first communication ports and the second communication ports are arranged on both sides of the first liquid inlet;

[0038] The electric ball valve can be rotated towards the first communication port, so that the third liquid inlet is simultaneously communicated with the second liquid inlet and the first communication port, the third liquid outlet is communicated with the second liquid outlet, and the second liquid outlet is partially closed;

[0039] The electric ball valve can be rotated towards the second communication port, so that the third liquid inlet is simultaneously communicated with the second liquid inlet and the first communication port, the third liquid outlet is communicated with the second liquid outlet, and the second liquid outlet is partially closed.

[0040] Optionally, in some embodiments of the present application, two fertilizer storage assemblies are comprised, the fertilizer inlet pipes of the two fertilizer storage assemblies are respectively communicated with the first communication ports and the second communication ports, and the fertilizer outlet pipes of the two fertilizer storage assemblies are communicated with the liquid outlet pipes.

[0041] The composite sensor and the differential pressure type water and fertilizer control system provided by the technical scheme of the application, through the above structure, when the composite sensor is applied to the differential pressure type water and fertilizer control system, the conductivity and the pH value of the liquid in the fertilizer pipe can be monitored in real time by the first detection probe and the second detection probe of the composite sensor, so as to monitor the concentration of the fertilizer liquid in the fertilizer pipe, when the conductivity value and the pH value gradually decrease and tend to be constant, it indicates that the fertilizer in the fertilizer storage container has been used up, and the relevant operator needs to supplement the fertilizer in time or switch the fertilizer storage container. In this way, the fertilizer concentration and the fertilizer time can be accurately controlled in the differential pressure fertilization process, so as to ensure the fertilization effect. At the same time, compared with the common conductivity sensor which can only detect the conductivity of the liquid in the fertilizer pipe and the common pH sensor which can only detect the pH value of the liquid in the fertilizer pipe, the composite sensor of the present example can detect the conductivity and the pH value of the liquid in the fertilizer pipe at the same time, and thus the concentration of the fertilizer liquid in the fertilizer pipe can be more accurately detected in real time. It can be seen that the present technical scheme can effectively improve the existing differential pressure type water and fertilizer control system, because there is a lack of related structure for accurately monitoring the concentration of the fertilizer liquid in the fertilizer pipe, which leads to the problem that the fertilizer concentration and the fertilizer time cannot be accurately controlled in the differential pressure fertilization process, and seriously affects the fertilization effect. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0043] Figure 1 The structural schematic diagram of the composite sensor provided by the embodiments of the present application is shown in the figure.

[0044] Figure 2 The cross-sectional structural schematic diagram of the composite sensor shown in the figure is shown in the figure. Figure 1

[0045] Figure 3 The structural schematic diagram of the differential pressure type water and fertilizer control system provided by the embodiments of the present application is shown in the figure.

[0046] Figure 4 The partial structural schematic diagram of the differential pressure type water and fertilizer control system shown in the figure is shown in the figure. Figure 3

[0047] The cross-sectional structural schematic diagram of the electric proportional valve of the differential pressure type water and fertilizer control system shown in the figure is shown in the figure. Figure 5 Figure 3

[0048] Figure 6 ​​​Another structural diagram of the pressure differential water and fertilizer control system provided in an embodiment of the present application;

[0049] Figure 7 for Figure 6 The schematic diagram of the structure of the electric ball valve of the pressure differential water and fertilizer control system shown;

[0050] Figure 8 for Figure 6 The schematic diagram of the partial disassembly structure of the electric ball valve shown;

[0051] Figure 9 for Figure 6 The cross-sectional structural diagram of the electric ball valve shown is in the first state;

[0052] Figure 10 for Figure 6 The cross-sectional structural diagram of the electric ball valve shown is in the second state.

[0053] Description of Figure Numbers:

[0054] 1. Pressure differential water and fertilizer control system; 100. Composite sensor; 110. Device housing; 111. Connecting part; 112. Sealing ring; 113. Protective structure; 120. First detection probe; 121. First electrode; 130. Second detection probe; 131. Second electrode; 132. Third electrode; 140. Control main board; 150. Connector; 160. Third detection probe; 200. Fertilizer storage assembly; 210. Fertilizer storage container; 211. Movable cover; 220. Fertilizer outlet pipeline; 221. One-way valve; 230. Fertilizer inlet pipeline; 231. First electric valve; 300. Liquid outlet pipeline; 400. Electric proportional valve; 410. First valve body; 411. First liquid inlet; 412. First liquid outlet; 420. A valve core; 421, a first connecting piece; 422, a first liquid channel; 500, a liquid inlet pipe; 610, a pressure detection component; 611, an air pipe; 612, an air pipe joint; 620, a first control mechanism; 710, a first adapter; 720, a second adapter; 800, an electric ball valve; 810, a second valve body; 811, a second liquid inlet; 812, a second liquid outlet; 813, a first connecting port; 814, a second connecting port; 815, a liquid inlet pipe joint; 816, a liquid outlet pipe joint; 817, a first connecting pipe joint; 818, a second connecting pipe joint; 820, a second valve core; 821, a third liquid inlet; 822, a third liquid outlet; 823, a second liquid channel; 824, a third connecting piece; 830, a control box.

[0055] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0057] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0058] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0059] In one embodiment, Figure 1 and Figure 2 As shown, an embodiment of the present application provides a composite sensor 100. The composite sensor 100 may specifically include a device housing 110, a first detection probe 120, a second detection probe 130, and a control motherboard 140. The first detection probe 120 is embedded in the device housing 110 and partially exposed on the surface of the device housing 110, and is primarily used to detect the conductivity of a liquid. The second detection probe 130 is embedded in the device housing 110 and partially exposed on the surface of the device housing 110, and is primarily used to detect the pH of a liquid. The control motherboard 140 is embedded in the device housing 110 and electrically connected to the first detection probe 120 and the second detection probe 130, respectively. The control motherboard 140 is primarily used to obtain a first measurement signal fed back by the first detection probe 120, perform a first predetermined signal processing on the first measurement signal to obtain a conductivity measurement result, and obtain a second measurement signal fed back by the second detection probe 130, and perform a second predetermined signal processing on the second measurement signal to obtain a pH measurement result.

[0060] It can be understood that the composite sensor 100 of the embodiments of the present application can be applied to systems such as the differential pressure water and fertilizer control system 1 and the like which need to monitor the conductivity and the pH value of the liquid in a certain component (which can be a container, a pipeline or a pipe in particular). The device shell 110 mentioned above is mainly used to protect the internal components such as the first detection probe 120, the second detection probe 130 and the control mainboard 140, and to provide a proper interface and environmental isolation. The first detection probe 120 mentioned above is mainly a conductivity detection probe, which generally includes two first electrodes 121 made of conductive materials, and the commonly used conductive materials include platinum, gold or stainless steel and the like. When working, an alternating voltage is applied to the two first electrodes 121, so that the electric field generated between the two first electrodes 121 drives the ions in the solution to move, thereby forming an electric current. At this time, by measuring the current flowing through the solution, the conductivity can be calculated according to Ohm's law (I = V / R). The conductivity (σ) is related to the current (I), the applied voltage (V) and the geometric shape of the electrode (electrode spacing and area). Using the formula σ = (I * L) / (V * A), where L is the electrode spacing and A is the effective area of the electrode, the conductivity of the solution can be obtained. Therefore, the first measurement signal mentioned above can be a current signal, and the first preset signal processing mentioned above can be an engineering calculation of the above formula. The second detection probe 130 mentioned above is mainly a pH value detection probe, which generally includes a second electrode 131 and a third electrode 132. The second electrode 131 is mainly a glass electrode made of special glass material and is sensitive to hydrogen ions, and is mainly used to measure the potential change. The third electrode 132 is mainly a reference electrode, and the commonly used types include a silver / silver chloride electrode or a saturated salt bridge electrode, and is mainly used to provide a stable reference voltage. When working, the second electrode 131 is immersed in the liquid to be measured, and the hydrogen ions interact with the surface of the electrode, so that a measurement potential is formed on the surface of the second electrode 131. At the same time, the third electrode 132 provides a stable reference potential, so that the output voltage of the second detection probe 130 is the difference between the potential of the second electrode 131 and the potential of the third electrode 132. At this time, the measured voltage can be converted into a pH value by using the Nernst equation. Generally speaking, each pH unit change corresponds to a voltage change of about 59.16 millivolts (at 25°C). Therefore, the second measurement signal mentioned above can be a voltage signal, and the second preset signal processing mentioned above can be a conversion and calculation process by using the Nernst equation.

[0061] In this way, the composite sensor 100 provided by the embodiment of the present application, when applied to the differential pressure type water and fertilizer control system 1, can monitor the concentration of the fertilizer solution in the fertilizer pipeline 220 by monitoring the conductivity and the pH value of the liquid in the fertilizer pipeline 220 through the first detection probe 120 and the second detection probe 130, respectively. When the conductivity value and the pH value gradually decrease and tend to be constant, it indicates that the fertilizer in the fertilizer storage container 210 has been used up, and the relevant operator needs to supplement the fertilizer in time or switch the fertilizer storage container 210. In this way, the concentration and the time of fertilization can be accurately controlled during the differential pressure fertilization process to ensure the fertilization effect. At the same time, compared with the common conductivity sensor which can only detect the conductivity of the liquid in the fertilizer pipeline 220 and the common pH value sensor which can only detect the pH value of the liquid in the fertilizer pipeline 220, the composite sensor 100 of the present example can detect the conductivity and the pH value of the liquid in the fertilizer pipeline 220 at the same time, and thus the concentration of the fertilizer solution in the fertilizer pipeline 220 can be more accurately detected in real time.

[0062] In some examples, as shown in Figure 1 The first end of the device housing 110 is provided with a connecting portion 111 around the outer periphery, and the device housing 110 is mounted and connected through the connecting portion 111. In this way, when the composite sensor 100 is used to monitor the conductivity and the pH value of the liquid in a certain component, the device housing 110 can be quickly mounted on the corresponding component through the connecting portion 111 to realize the mounting and fixing of the composite sensor 100 on the corresponding component.

[0063] It can be understood that the connecting portion 111 mentioned in the present example can be a threaded structure as shown in Figure 1 to realize the mounting and connection of the device housing 110 in a threaded manner, or other connecting structures such as buckles that can realize quick disassembly and assembly.

[0064] In some examples, as shown in Figure 1 The first end of the device housing 110 is provided with a connecting portion 111 around the outer periphery, and the device housing 110 is mounted and connected through the connecting portion 111. In this way, when the composite sensor 100 is used to monitor the conductivity and the pH value of the liquid in a certain component, the device housing 110 can be quickly mounted on the corresponding component through the connecting portion 111 to realize the mounting and fixing of the composite sensor 100 on the corresponding component.

[0065] In some examples, as shown in Figure 1As shown, the end surface of the first end of the device shell 110 is respectively provided with a first probe hole and a second probe hole, part of the first detection probe 120 extends out through the first probe hole to be exposed on the surface of the device shell 110, and part of the second detection probe 130 extends out through the second probe hole to be exposed on the surface of the device shell 110. In this way, through the above structural arrangement, the main part of the first detection probe 120 and the main part of the second detection probe 130 can be well isolated and protected in the device shell 110, while part of them is exposed through the corresponding first probe hole and second probe hole to contact with the external liquid to detect the conductivity and pH value of the external liquid.

[0066] It can be understood that, based on the above description, the first detection probe 120 mainly includes two first electrodes 121, so the first probe hole mainly includes two first electrode 121 holes to correspond to the part of the two first electrodes 121 extending out through the two first electrode 121 holes to be exposed on the surface of the device shell 110. The second detection probe 130 mainly includes a second electrode 131 and a third electrode 132, so the second probe hole mainly includes a second electrode 131 hole and a third electrode 132 hole to make part of the second electrode 131 extend out through the second electrode 131 hole to be exposed on the surface of the device shell 110, and part of the third electrode 132 extend out through the third electrode 132 hole to be exposed on the surface of the device shell 110. At the same time, since the second electrode 131 is mainly a glass electrode, the periphery of the second electrode 131 hole can be outwardly convex to form a ring-shaped electrode protection part, and the ring-shaped electrode protection part is arranged in a wave shape along the periphery of the second electrode 131 hole, so that the ring-shaped electrode protection part is arranged around the exposed part of the second electrode 131, which can provide certain protection for the exposed part of the second electrode 131 without affecting the contact between the second electrode 131 and the external liquid.

[0067] In some examples, as shown in Figure 2 As shown, the control mainboard 140 includes a communication module (not shown), and the composite sensor 100 further includes a connector 150, which is arranged at the second end of the device shell 110, and the inner side of the connector 150 is electrically connected with the communication module, and the outer side of the connector 150 is electrically connected with an external circuit, and the connector 150 is used to feed back the conductivity measurement result and the pH value measurement result obtained by the control mainboard 140 to the external circuit respectively. In this way, through the structural arrangement of the connector 150, the signal connection between the composite sensor 100 and the external circuit can be quickly realized.

[0068] In some examples, as shown in Figure 1As shown, the end face of the first end of the device housing 110 is provided with a protection structure 113, and the exposed part of the first detection probe 120 and the exposed part of the second detection probe 130 are both outside the end face of the first end of the device housing 110 and are both within the protection range of the protection structure 113. In this way, the exposed part of the first detection probe 120 and the exposed part of the second detection probe 130 can be protected by the protection structure 113 without affecting the contact of the first detection probe 120 and the second detection probe 130 with the external liquid. Further, the protection structure 113 includes a plurality of protection protrusions, and the plurality of protection protrusions are arranged at intervals along the end face of the first end of the device housing 110 to surround and protect the exposed part of the first detection probe 120 and the exposed part of the second detection probe 130 outside the end face of the first end of the device housing 110. In this way, the plurality of protection protrusions are arranged at intervals, so that the external liquid can enter the protection space through the top opening formed by the plurality of protection protrusions to contact the first detection probe 120 and the second detection probe 130 in the protection space, or can enter the protection space through the gap between the protection protrusions to contact the first detection probe 120 and the second detection probe 130 in the protection space, thereby protecting the exposed part of the first detection probe 120 and the exposed part of the second detection probe 130 without affecting the contact of the first detection probe 120 and the second detection probe 130 with the external liquid.

[0069] In some examples, as Figure 1 and Figure 2As shown, the composite sensor 100 further comprises a third detection probe 160, wherein the third detection probe 160 is built-in in the device housing 110 and partially exposed on the surface of the device housing 110 for detecting the temperature of the liquid, at this time, the control mainboard 140 is further electrically connected with the third detection probe 160 for obtaining the first measurement signal fed back by the first detection probe 120 and the third measurement signal fed back by the third detection probe 160, and performing first preset signal processing on the first measurement signal to obtain the conductivity measurement result, and obtaining the second measurement signal fed back by the second detection probe 130 and the third measurement signal fed back by the third detection probe 160, and performing second preset signal processing on the second measurement signal to obtain the pH value measurement result. Wherein, the first preset signal processing comprises temperature compensation processing on the first measurement signal according to the third measurement signal, and the second preset signal processing comprises temperature compensation processing on the second measurement signal according to the third measurement signal. In this way, through the above structural arrangement, the temperature compensation processing on the first measurement signal fed back by the first detection probe 120 according to the temperature of the liquid detected by the third detection probe 160 can be further ensured to improve the accuracy of the conductivity measurement result, and the temperature compensation processing on the second measurement signal fed back by the second detection probe 130 according to the temperature of the liquid detected by the third detection probe 160 can be further ensured to improve the accuracy of the pH value measurement result.

[0070] It can be understood that the third detection probe 160 mentioned in the present example is mainly a temperature probe, which can generally be a thermocouple or a thermal resistance (such as PT100, PT1000) structure.

[0071] In some examples, as shown in Figure 1 and Figure 2 As shown, the end surface of the first end of the device housing 110 is provided with a third probe hole, and part of the third detection probe 160 is exposed through the third probe hole to the surface of the device housing 110. In this way, through the above structural arrangement, the main part of the third detection probe 160 can be built-in in the device housing 110 for isolation and protection, and part of it can be exposed through the corresponding third probe hole to contact with the external liquid for corresponding stable detection of the external liquid.

[0072] In one embodiment, as shown in Figure 3As shown, the embodiment of the present application also provides a differential pressure type water and fertilizer control system 1, which can specifically include a fertilizer storage assembly 200 and a liquid outlet pipeline 300. The fertilizer storage assembly 200 can specifically include a fertilizer storage container 210, a fertilizer outlet pipeline 220, and the composite sensor 100 in the above embodiment. The fertilizer outlet pipeline 220 is mainly used to realize the communication between the fertilizer storage container 210 and the liquid outlet pipeline 300. The composite sensor 100 is connected with the liquid outlet pipeline 300 and is mainly used to detect the electrical conductivity and the pH value of the liquid in the fertilizer outlet pipeline 220.

[0073] It can be understood that the differential pressure type water and fertilizer control system 1 in the embodiment of the present application can be a common differential pressure type water and fertilizer control system 1 on the market to control fertilization by the differential pressure fertilization method. Since the composite sensor 100 in the embodiment of the present application is the composite sensor 100 in the above application embodiment, it has the same structural features and functions, which will not be described here.

[0074] In this way, the differential pressure type water and fertilizer control system 1 mentioned in the embodiment of the present application can realize real-time monitoring of the electrical conductivity and the pH value of the liquid in the fertilizer outlet pipeline 220 by the first detection probe 120 and the second detection probe 130 of the composite sensor 100, respectively, to monitor the fertilizer liquid concentration in the fertilizer outlet pipeline 220. When the electrical conductivity value and the pH value gradually decrease and tend to be constant, it indicates that the fertilizer in the fertilizer storage container 210 has been used up, and the relevant operating personnel need to supplement the fertilizer in time or switch the fertilizer storage container 210. In this way, the fertilization concentration and the fertilization time can be accurately controlled during the differential pressure fertilization process to ensure the fertilization effect.

[0075] In some examples, as Figure 3 As shown, the differential pressure type water and fertilizer control system 1 also includes an electric proportional valve 400 and a liquid inlet pipeline 500. The electric proportional valve 400 is provided with a first liquid inlet 411 and a first liquid outlet 412. The liquid inlet pipeline 500 is in communication with the first liquid inlet 411. The liquid outlet pipeline 300 is in communication with the first liquid outlet 412 and is mainly used to output the liquid required for irrigation or fertilization. The fertilizer storage assembly 200 also includes a fertilizer inlet pipeline 230 with a first electric valve 231. The fertilizer storage container 210 is also provided with a fertilizer inlet (not shown) and a fertilizer outlet (not shown). The fertilizer inlet is in communication with the liquid inlet pipeline 500 through the fertilizer inlet pipeline 230. The fertilizer outlet is in communication with the liquid outlet pipeline 300 through the fertilizer outlet pipeline 220. The first electric valve 231 is used to control the communication and closing of the fertilizer inlet pipeline 230. The electric proportional valve 400 is used to adjust the opening and closing ratio to form a pressure difference between the liquid between the first liquid inlet 411 and the first liquid outlet 412, so that the liquid flows from the liquid inlet pipeline 500 to the fertilizer inlet pipeline 230 and enters the fertilizer storage container 210.

[0076] It can be understood that the first electric valve 231 mentioned in the example can be an electromagnetic valve, an electric butterfly valve, an electric gate valve, etc. Preferably, an electromagnetic valve with high control precision is used to precisely control the communication and closing of the fertilizer inlet pipeline 230, and better cooperate with the electric proportional valve 400 to realize the linkage control between the two mentioned later. The electric proportional valve 400 mentioned in the example can be an electric ball valve, an electric butterfly valve, an electric gate valve, etc. which can control the flow by controlling the opening and closing ratio. Preferably, an electric ball valve with high control precision is used. In addition, the fertilizer storage container 210 mentioned in the embodiment of the application is mainly a tank structure or other container structure that can store fertilizers.

[0077] In this way, the pressure difference type water and fertilizer control system 1 provided by the embodiment of the application, through the above structure, when the pressure difference type water and fertilizer control system 1 needs to be controlled, only needs to start the first electric valve 231 to precisely control the closing of the fertilizer inlet pipeline 230, and start the electric proportional valve 400 and precisely control the opening and closing ratio of the electric proportional valve 400 to adjust the water flow size, and then deliver to the irrigation system through the liquid outlet pipeline 300 to complete the corresponding irrigation control. When the pressure difference type water and fertilizer control system 1 needs to be controlled, only needs to start the first electric valve 231 to precisely control the communication of the fertilizer inlet pipeline 230, and start the electric proportional valve 400 and precisely control the opening and closing ratio of the electric proportional valve 400, so that part of the first liquid outlet 412 of the electric proportional valve 400 is closed, so that the first liquid inlet 411 and the first liquid outlet 412 of the electric proportional valve 400 form a pressure difference, so that part of the liquid in the liquid inlet pipeline 500 flows to the fertilizer inlet pipeline 230 and enters the fertilizer storage container 210. After the fertilizer solution in the container is dissolved, the fertilizer solution reflows into the liquid outlet pipeline 300 to be delivered to the irrigation system through the liquid outlet pipeline 300 to complete the corresponding pressure difference fertilization control. It can be seen that the pressure difference type water and fertilizer control system 1 of the embodiment of the application only needs to cooperate with one electric valve and one electric proportional valve 400 to realize the control of irrigation and pressure difference fertilization, thereby greatly reducing the related operation steps and bringing great convenience to the related operating personnel.

[0078] In some examples, as Figure 3As shown, the differential pressure type water and fertilizer control system 1 further comprises a pressure detection assembly 610, which is arranged adjacent to the first liquid outlet 412 and used for detecting the liquid pressure at the first liquid outlet 412. In this way, the accurate detection of the liquid pressure at the first liquid outlet 412 by the pressure detection assembly 610 allows the relevant operating personnel to accurately know the liquid pressure at the first liquid outlet 412 in real time, so that when the liquid pressure at the first liquid outlet 412 changes, the opening and closing ratio of the electric proportional valve 400 can be accurately controlled accordingly to ensure that the pressure difference of the main pipeline (including the liquid inlet pipeline 500 and the liquid outlet pipeline 300) before and after the electric proportional valve 400 is constant, so that the water flow through the fertilizer storage container 210 is constant, thereby realizing the timed and quantitative fertilization.

[0079] It can be understood that the pressure detection assembly 610 mentioned in the present example generally comprises a pressure sensor, which can be any one of a gas pressure sensor, a strain gauge pressure sensor, a piezoelectric pressure sensor, and a capacitive pressure sensor. In addition, the pressure detection assembly 610 can also specifically comprise a gas pressure sensor (not shown), a gas pipe 611, and a gas pipe 611 connector. In operation, the gas pipe 611 is connected to the gas pipe 611 connector on the first valve body 410 to detect the liquid pressure at the first liquid outlet 412 by detecting the gas pressure.

[0080] In some examples, as shown, Figure 3 As shown, the differential pressure type water and fertilizer control system 1 further comprises a first control mechanism 620, which is electrically connected with the pressure detection assembly 610, the electric proportional valve 400, and the first electric valve 231, respectively, and used for adjusting the opening and closing ratio of the electric proportional valve 400 and controlling the communication and closing of the first electric valve 231 according to the liquid pressure detected by the pressure detection assembly 610. In this way, through the above structural arrangement, the electric proportional valve 400 arranged between the liquid inlet pipeline 500 and the liquid outlet pipeline 300 and the first electric valve 231 arranged on the fertilizer inlet pipeline 230 are both automatically controlled and are both linked and controlled by the first control mechanism 620, that is, when the pressure detection assembly 610 detects that the liquid pressure at the first liquid outlet 412 changes, the opening and closing ratio of the electric proportional valve 400 is automatically controlled accurately and the communication and closing of the first electric valve 231 are automatically controlled, so as to automatically adjust the pressure of the main pipeline (including the liquid inlet pipeline 500 and the liquid outlet pipeline 300) and the pressure of the fertilizer storage container 210 in real time, thereby ensuring that the pressure difference of the main pipeline (including the liquid inlet pipeline 500 and the liquid outlet pipeline 300) before and after the electric proportional valve 400 is constant, so that the water flow through the fertilizer storage container 210 is constant, thereby realizing the timed and quantitative fertilization and ensuring the uniform irrigation.

[0081] It can be understood that the first control mechanism 620 mentioned in the present example can be a control box to realize linkage control of the electric proportional valve 400 and the first electric valve 231. For those skilled in the art, it can also include multiple independently arranged control components to realize electric control of the electric proportional valve 400 and the first electric valve 231 respectively.

[0082] In some examples, as shown in Figure 3 , Figure 4 and Figure 5 , the electric proportional valve 400 includes a first valve body 410 connected with the first control mechanism 620 and a first valve core 420 arranged inside the first valve body 410. The first valve core 420 includes a first connecting piece 421, and the first control mechanism 620 includes a first driving assembly including a second connecting piece. The first connecting piece 421 and the second connecting piece are connected, and the first driving assembly drives the second connecting piece to rotate to drive the first valve core 420 to rotate relative to the first valve body 410 to adjust the opening and closing ratio of the electric proportional valve 400. In this way, the above structure can be arranged so that the first control mechanism 620 can drive the first valve core 420 to rotate relative to the first valve body 410 through the first driving assembly according to actual control needs to adjust the opening and closing ratio of the electric proportional valve 400.

[0083] It is understandable that the driving assembly in this example can be specifically a motor power assembly. In this case, the first connecting member 421 can be specifically a transmission rod, and the second connecting member can be specifically a motor shaft. The two can be coaxially connected through a structure such as a coupling, so that when the motor power assembly drives the motor shaft to rotate, it synchronously drives the transmission rod to rotate, and then drives the first valve core 420 to rotate relative to the first valve body 410 through the transmission rod. To facilitate the installation and rotation of the first valve core 420 in the first valve body 410, the interior of the first valve body 410 is generally hollow to form an installation cavity therein to install the first valve core 420. At the same time, the inner side of the first liquid inlet 411 and the inner side of the first liquid outlet 412 mentioned above should both be connected to the installation cavity. The first valve core 420 mentioned in this example is generally roughly spherical, or other rotatable shapes, including but not limited to hemispherical, cylindrical, polygonal, and other shapes. In order to facilitate the first valve core 420 to have sufficient rotation space in the installation cavity, the shape of the main part of the installation cavity is generally compatible with the outer shape of the first valve core 420, and the dimensions in all aspects are slightly larger than the first valve core 420, to ensure that the first valve core 420 can smoothly rotate accordingly in the installation cavity. In addition, a first liquid channel 422 is provided through the first valve core 420. The inlet of the first liquid channel 422 is generally oriented towards the side where the first liquid inlet 411 is located, and the outlet of the first liquid channel 422 is generally oriented towards the side where the first liquid outlet 412 is located. In this way, the first valve core 420 can be rotated relative to the first valve body 410 to adjust the proportion of the inlet of the first liquid channel 422 facing the first liquid inlet 411, thereby achieving the adjustment operation of the opening and closing ratio of the electric proportional valve 400.

[0084] In some examples, such as Figure 3 As shown, a one-way valve 221 is provided on the fertilizer outlet pipe 220. The one-way valve 221 allows the fertilizer solution exiting the fertilizer outlet of the fertilizer storage container 210 to be quickly transported to the liquid outlet pipe 300 through the fertilizer outlet pipe 220. This effectively prevents the liquid in the liquid outlet pipe 300 from flowing back into the fertilizer storage container 210 during the fertilizer addition process. This eliminates the need for unnecessary operations during the fertilizer addition process, as the fertilizer storage container 210 can simply be opened.

[0085] In some examples, such as Figure 3As shown, the differential pressure water and fertilizer control system 1 includes two or more fertilizer storage components 200. In this case, the differential pressure water and fertilizer control system 1 also includes a second control mechanism, which is electrically connected to each first electric valve 231 and each composite sensor 100. The second control mechanism is also used to control the connection and closing of each first electric valve 231 based on the conductivity test results and pH test results of each composite sensor 100. In this way, through the above-mentioned structural arrangement, the differential pressure water and fertilizer control system 1 of the system can be expanded to a multi-channel structure with multiple fertilizer storage components 200 coexisting. In addition to increasing the amount of fertilizer applied, such as to avoid frequent fertilization and personnel monitoring during peak crop fertilization periods or when large irrigation areas require more fertilizer, it can also apply multiple types of fertilizer at a time, with each type of fertilizer provided with a fertilizer storage container 210. Then, based on the growth conditions of the crops in the desired fertilization plot, the required type of fertilizer or several types of fertilizers that are in short supply can be accurately and quantitatively delivered to the crops, thereby further improving the fertilization efficiency and effectiveness.

[0086] It can be understood that the second control mechanism mentioned in this example can be a structure independent of the first control mechanism 620, or it can be the same control mechanism as the first control mechanism 620. In this way, it is easy to realize the integrated automatic control of the pressure differential water and fertilizer control system 1.

[0087] In some examples, such as Figure 3 As shown, the pressure differential water fertilizer control system 1 further includes a first adapter 710, which is connected to the liquid inlet pipe.

[0088] 500 and the first liquid inlet 411, the fertilizer inlet pipeline 230 is connected to the liquid inlet pipeline through one of the branch ports of the first adapter 710

[0089] In this way, by setting the first adapter 710, the fertilizer inlet pipeline 230 of the fertilizer storage assembly 200 can be quickly connected to the liquid inlet pipeline 500. When multiple fertilizer storage assemblies 200 need to be connected, the corresponding number of first adapters 710 can be added to achieve the connection of the fertilizer inlet pipelines 230 of the corresponding number of fertilizer storage assemblies 200 to the liquid inlet pipeline 500.

[0090] It can be understood that the first adapter 710 in this example is specifically a transition connecting structure similar to a tee joint with at least one branch connection port, and multiple first adapters 710 can be nested to increase the number of liquid inlet pipelines at the end of the liquid inlet pipeline 500.

[0091] In some examples, such as Figure 3As shown, the pressure differential water-fertilizer control system 1 further includes a second adapter 720, which is disposed between the liquid outlet pipe 300 and the first liquid outlet 412. The fertilizer outlet pipe 220 is connected to one end of the liquid outlet pipe 300 via one of the branch connection ports of the second adapter 720. Thus, by disposing the second adapter 720, the fertilizer outlet pipe 220 of the fertilizer storage assembly 200 can be quickly connected to the liquid outlet pipe 300. When multiple fertilizer storage assemblies 200 need to be connected, the corresponding number of second adapters 720 can be added to connect the fertilizer outlet pipes 220 of the corresponding number of fertilizer storage assemblies 200 to the liquid outlet pipe 300.

[0092] It can be understood that the second adapter 720 in this example is specifically a transition connecting structure similar to a tee joint with at least one branch connection port, and multiple second adapters 720 can be nested to increase the number of liquid outlet pipelines at the end of the liquid outlet pipeline 300.

[0093] In some examples, such as Figure 3 As shown, the second liquid inlet 811 is disposed near the bottom of the fertilizer storage container 210, and the second liquid outlet 812 is disposed near the top of the fertilizer storage container 210. This ensures that the liquid entering through the second liquid inlet 811 fully dissolves the fertilizer in the fertilizer storage container 210 to form a fertilizer solution, which is then output to the liquid outlet pipe 300 through the second liquid outlet 812. Furthermore, to facilitate the addition of fertilizer to the fertilizer storage container 210, a fertilizer addition port with a removable cover 211 is provided at the top of the fertilizer storage container 210.

[0094] In some examples, such as Figures 6 to 10 As shown, the pressure differential water and fertilizer control system 1 also includes an electric ball valve 800 and a liquid inlet pipe 500, wherein the electric ball valve 800 includes a second valve body 810, a second valve core 820 and a second drive assembly, and the second valve body 810 is provided with a second liquid inlet 811, a second liquid outlet 812 and a connecting port, for example Figures 8-10The first and / or second communication ports 813 and 814 are shown adjacent to the second liquid inlet 811. A second valve core 820 is incorporated into the second valve body 810. The second valve core 820 is provided with a third liquid inlet 821 and a third liquid outlet 822, which is internally connected to the third liquid inlet 821. A second drive assembly is in transmission connection with the second valve core 820 to drive the second valve core 820 to rotate, thereby switching the electric ball valve 800 between the first and second states. The liquid inlet conduit 500 is connected to the second liquid inlet 811. The liquid outlet conduit 300, connected to the second liquid outlet 812, is used to output liquid required for irrigation or fertilization. The fertilizer storage assembly 200 further includes a fertilizer inlet pipeline 230. The fertilizer storage container 210 is further provided with a fertilizer inlet and a fertilizer outlet. The fertilizer inlet is connected to the connecting port via the fertilizer inlet pipeline 230, and the fertilizer outlet is connected to the liquid outlet pipe 300 via the fertilizer outlet pipeline 220. When the electric ball valve 800 is in a first state, the third liquid inlet 821 is connected to the second liquid inlet 811, the third liquid outlet 822 is connected to the second liquid outlet 812, and the connecting ports are completely closed. When the electric ball valve 800 is in a second state, the third liquid inlet 821 is connected to both the second liquid inlet 811 and the connecting port. For example, the third liquid inlet 821 is connected to both the second liquid inlet 811 and the first connecting port 813, or the third liquid inlet 821 is connected to both the second liquid inlet 811 and the second connecting port 814, and the third liquid outlet 822 is connected to the second liquid outlet 812, and the second liquid outlet 812 is partially closed. Thus, through the above-mentioned structural setting, the second valve core 820 of the electric ball valve 800 can be controlled to rotate so that the electric ball valve 800 is in the following state: Figure 9 In the first state shown, at this time, since the third liquid inlet 821 is connected to the second liquid inlet 811, and the third liquid outlet 822 is connected to the second liquid outlet 812, all the connecting ports are closed, so that the liquid inlet pipe 500 and the liquid outlet pipe 300 are connected through the electric ball valve 800. The liquid (specifically, water) in the liquid inlet pipe 500 flows into the liquid outlet pipe 300 through the electric ball valve 800, and is then transported to the irrigation system through the liquid outlet pipe 300 to complete the corresponding irrigation control. The electric ball valve 800 can also be controlled to rotate so that the electric ball valve 800 is in the state shown in FIG. Figure 10In the second state shown, the third liquid inlet 821 is connected to the second liquid inlet 811 and the communication port at the same time, the third liquid outlet 822 is connected to the second liquid outlet 812, and the second liquid outlet 812 is partially closed, so that the hydraulic pressure at the liquid outlet of the electric ball valve 800 is lower than that at the liquid inlet, thereby forming a pressure difference, so that part of the liquid in the liquid inlet pipeline 500 flows to the first fertilizer storage container 210 through the communication port, and after the fertilizer in the dissolving container is dissolved to obtain a fertilizer solution, the fertilizer solution reflows into the liquid outlet pipeline 300 to be delivered to irrigation through the liquid outlet pipeline 300, thereby completing the control of the corresponding pressure difference fertilization. It can be seen that in the pressure difference water and fertilizer control system 1 in this example, only one electric ball valve 800 can realize the control of irrigation and pressure difference fertilization of the pressure difference water and fertilizer control system 1 at the same time, thereby greatly reducing the relevant operation steps and bringing great convenience to the relevant operating personnel.

[0095] It can be understood that, in order to facilitate the installation and rotation of the second valve core 820 in the second valve body 810, the inside of the second valve body 810 is generally hollow to form an installation cavity inside to install the second valve core 820. At the same time, the inside of the second liquid inlet 811, the inside of the second liquid outlet 812, and the inside of the communication port are generally connected to the installation cavity. In order to better connect the corresponding pipelines or pipelines to the outside of the second liquid inlet 811, the outside of the second liquid outlet 812, and the outside of the first communication port 813 (or the second communication port 814), the shapes of the second liquid inlet 811, the second liquid outlet 812, and the communication port are generally circular or other shapes that can better realize the connection of the corresponding pipelines or pipelines to the installation cavity, including but not limited to semicircular, elliptical, polygonal, etc. Since the third liquid inlet 821 needs to be connected to the second liquid inlet 811 or simultaneously connected to the second liquid inlet 811 and the communication port, and the third liquid outlet 822 needs to be connected to the second liquid outlet 812, the shapes of the third liquid inlet 821 and the third liquid outlet 822 are also generally circular or other shapes that can facilitate their corresponding connection, including but not limited to semicircular, elliptical, polygonal, etc. The second valve core 820 mentioned above is generally spherical or other rotatable shapes, including but not limited to semispherical, cylindrical, polygonal column, etc. In order to facilitate the second valve core 820 to have enough rotation space in the installation cavity, the shape of the main part of the installation cavity is generally adapted to the shape of the second valve core 820, and the dimensions of each aspect are slightly larger than the second valve core 820, so as to ensure that the second valve core 820 can smoothly rotate in the installation cavity.

[0096] In addition, as mentioned above, when the electric ball valve 800 is in the first state, the third liquid inlet 821 is connected to the second liquid inlet 811, and the third liquid outlet 822 is connected to the second liquid outlet 812. The connecting ports are all closed generally refer to that in the first state, the third liquid inlet 821 is opposite to the second liquid inlet 811, so that the second liquid inlet 811 is fully opened and connected with the third liquid inlet 821; the third liquid outlet 822 is opposite to the second liquid outlet 812, so that the second liquid outlet 812 is fully opened and connected with the third liquid outlet 822; the connecting port is opposite to the part of the second valve core 820 that has no opening, so that the connecting port is completely blocked by the second valve core 820 and is in a completely closed state, that is, it cannot be connected with the installation cavity mentioned above. Similarly, as mentioned above, when the electric ball valve 800 is in the second state, the third liquid inlet 821 is connected to the second liquid inlet 811 and the connecting port at the same time, and the third liquid outlet 822 is connected to the second liquid outlet 812. The partial closure of the second liquid outlet 812 generally means that in the second state, a part of the third liquid inlet 821 is aligned with the second liquid inlet 811, and the other part is aligned with the connecting port, so that the second liquid inlet 811 and the connecting port are partially open and connected with the third liquid inlet 821 at the same time; a part of the third liquid outlet 822 is aligned with the second liquid outlet 812, so that while the second liquid outlet 812 is connected with the third liquid outlet 822, part of the second liquid outlet 812 is blocked by the second valve core 820, and is in a partially closed state.

[0097] In some examples, the communication port includes a first communication port 813 and a second communication port 814 , and the first communication port 813 and the second communication port 814 are disposed on both sides of the first liquid inlet.

[0098] The electric ball valve 800 can rotate toward the first connecting port 813 so that the third liquid inlet 822 is connected to the second liquid inlet 811 and the first connecting port 813 at the same time, the third liquid outlet 822 is connected to the second liquid outlet 812, and the second liquid outlet 912 is partially closed, thereby forming a pressure difference between the second liquid inlet and the second liquid outlet of the electric ball valve.

[0099] Alternatively, the electric ball valve 800 can rotate toward the second connecting port 814 so that the third liquid inlet 822 is connected to the second liquid inlet 811 and the second connecting port 814 at the same time, the third liquid outlet 822 is connected to the second liquid outlet 812, and the second liquid outlet 812 is partially closed, thereby forming a pressure difference between the second liquid inlet and the second liquid outlet of the electric ball valve.

[0100] like Figures 8-10As shown, the second valve body 810 is further provided with a second communication port 814, and the first communication port 813 and the second communication port 814 are respectively located on both sides of the second liquid inlet port 811 and are both arranged adjacent to the second liquid inlet port 811. The second drive assembly is in transmission connection with the second valve core 820 to drive the second valve core 820 to rotate, so that the electric ball valve 800 can be switched between the first state and the second state. When the electric ball valve 800 is in the first state, the second liquid inlet port 811 communicates with the first liquid inlet port 411, the second liquid outlet port 812 communicates with the first liquid outlet port 412, and the first communication port 813 and the second communication port 814 are all closed. When the electric ball valve 800 is rotated towards the first communication port 813 or the second communication port 814, the electric ball valve can be rotated to the second state. When the electric ball valve 800 is rotated towards the first communication port 813, the second liquid inlet port 811 simultaneously communicates with the first liquid inlet port 411 and the first communication port 813, the second liquid outlet port 812 communicates with the first liquid outlet port 412, and the second communication port 814 is all closed. The first liquid outlet port 412 is partially closed. When the electric ball valve 800 is rotated towards the second communication port 814, the second liquid inlet port 811 simultaneously communicates with the first liquid inlet port 411 and the second communication port 814, the second liquid outlet port 812 communicates with the first liquid outlet port 412, and the first communication port 813 is all closed. The first liquid outlet port 412 is partially closed.

[0101] Further, as shown, Figure 6 The two fertilizer storage assemblies 200 are provided with the fertilizer inlet pipelines 230 respectively communicating with the first communication port 813 and the second communication port 814, and the fertilizer outlet pipelines 220 of the two fertilizer storage assemblies 230 communicate with the liquid outlet pipeline 300.

[0102] The differential pressure type water and fertilizer control system 1 includes two fertilizer storage assemblies 200, and two communication ports are arranged on the electric ball valve 800, so that the two fertilizer storage assemblies 200 can contain more fertilizer. In the prior art, the user manually judges that the fertilizer in the fertilizer storage container 210 is consumed, and then manually adds fertilizer to the fertilizer storage container 210. In the present scheme, the number of times of adding fertilizer to the fertilizer storage container 210 by the user can be reduced by increasing the fertilizer storage container 210. The electric ball valve 800 communicates with the two fertilizer storage containers 210, and in the process of fertilization, the electric ball valve can be automatically controlled to rotate to make the first communication port 813 communicate with the second liquid inlet port 811, so as to fertilize through the corresponding fertilizer storage container 210. When the fertilizer in one fertilizer storage container 210 is consumed, the electric ball valve 800 can be automatically controlled to rotate to make the second communication port 814 communicate with the second liquid inlet port 811, so as to fertilize through the other fertilizer storage assembly 200. In this way, the number of times of adding fertilizer to the fertilizer storage container 210 by the user can be reduced.

[0103] In another embodiment, the fertilizer storage containers 210 of the two fertilizer storage assemblies 200 can also store different types of fertilizers, and thus, the fertilization sequence of the two fertilizer storage containers 210 can be automatically controlled to sequentially fertilize the different types of fertilizers, thereby improving the fertilization effect of the different types of fertilizers in the field.

[0104] In some examples, as shown in Figure 7 and Figure 8 The second valve body 810 can be provided with a second communication pipe joint 818, and the second communication port is arranged on the second communication pipe joint 818. In this way, the structure of the second communication pipe joint 818 can make the installation and connection between the second valve body 810 and the second communication pipe more convenient and firm, and quickly realize the communication between the second communication pipe and the first liquid outlet 412. The valve body can be provided with a liquid outlet pipe joint 816, and the first liquid outlet 412 is arranged on the liquid outlet pipe joint 816. In this way, the structure of the liquid outlet pipe joint 816 can make the installation and connection between the valve body and the liquid outlet pipe 300 more convenient and firm, and quickly realize the communication between the liquid outlet pipe 300 and the first liquid outlet 412. The valve body can be provided with a first communication pipe joint 817, and the first communication port 813 is arranged on the first communication pipe joint 817. In this way, the structure of the first communication pipe joint 817 can make the installation and connection between the valve body and the first communication pipe more convenient and firm, and quickly realize the communication between the first communication pipe and the first liquid outlet 412.

[0105] In some examples, as shown in Figure 7 and Figure 8 The electric ball valve 800 further includes a control box connected with the second valve body 810, and a second drive assembly is arranged on the control box. The second valve core 820 includes a third connecting piece 824, and the second drive assembly includes a fourth connecting piece connected with the third connecting piece 824. The second drive assembly drives the second connecting piece to rotate to drive the second valve core 820 to rotate relative to the second valve body 810. In this way, the control box can drive the second valve core 820 to rotate relative to the valve body according to actual control needs through the second drive assembly, so as to realize the switching of the electric ball valve 800 between the first state, the second state and the third state.

[0106] It can be understood that the second drive assembly in the example can be a motor power structure. At this time, the third connecting piece 824 can be a transmission rod, and the fourth connecting piece can be a motor shaft. The two can be coaxially connected through a structure such as a shaft coupling, so that when the motor power module drives the motor shaft to rotate, the transmission rod is also driven to rotate, and the second valve core 820 is driven to rotate relative to the second valve body 810 through the transmission rod.

[0107] The above merely describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A composite sensor, characterized by, The device comprises a device shell, a first detection probe, a second detection probe, and a control mainboard, wherein, The first detection probe is built-in in the device shell and partially exposed on the surface of the device shell, and is used for detecting the conductivity of the liquid. The second detection probe is built-in in the device shell and partially exposed on the surface of the device shell, and is used for detecting the pH value of the liquid. The control mainboard is built-in in the device shell and is electrically connected with the first detection probe and the second detection probe respectively, is used for acquiring the first measurement signal fed back by the first detection probe, performing first preset signal processing on the first measurement signal to obtain the conductivity measurement result, and acquiring the second measurement signal fed back by the second detection probe, and performing second preset signal processing on the second measurement signal to obtain the pH value measurement result.

2. The composite sensor of claim 1, wherein, A connecting portion is arranged around the outer periphery of the first end of the device shell, and the device shell is mounted and connected through the connecting portion.

3. The composite sensor of claim 2, wherein, A sealing ring is further arranged around the outer periphery of the first end of the device shell, and the sealing ring is arranged adjacent to the connecting portion to seal the mounting and connection position when the connecting portion is mounted and connected.

4. The composite sensor of claim 1, wherein, First and second probe holes are respectively arranged on the end face of the first end of the device shell, part of the first detection probe is extended out through the first probe hole to be exposed on the surface of the device shell, and part of the second detection probe is extended out through the second probe hole to be exposed on the surface of the device shell.

5. The composite sensor of claim 1, wherein, The control mainboard comprises a communication module, the composite sensor further comprises a connector, the connector is arranged on the second end of the device shell, the inner side of the connector is electrically connected with the communication module, the outer side of the connector is electrically connected with an external circuit, and the connector is used for feeding back the conductivity measurement result and the pH value measurement result obtained by the control mainboard to the external circuit respectively.

6. The composite sensor of claim 1, wherein, A protection structure is arranged around the end face of the first end of the device shell, and part of the first detection probe and part of the second detection probe are both exposed out of the end face of the first end of the device shell and are both within the protection range of the protection structure.

7. The composite sensor of claim 6, wherein, The protection structure comprises a plurality of protection protrusions, and the plurality of protection protrusions are arranged at intervals along the end face of the first end of the device shell to surround and protect part of the first detection probe and part of the second detection probe exposed out of the end face of the first end of the device shell.

8. The composite sensor of any one of claims 1-7, wherein, The device further comprises a third detection probe, wherein, The third detection probe is built-in in the device shell and partially exposed on the surface of the device shell to detect the temperature of the liquid. The control mainboard is also electrically connected with the third detection probe, is used for obtaining the first measurement signal fed back by the first detection probe and the third measurement signal fed back by the third detection probe, performing first preset signal processing on the first measurement signal to obtain a conductivity measurement result, and obtaining the second measurement signal fed back by the second detection probe and the third measurement signal fed back by the third detection probe, and performing second preset signal processing on the second measurement signal to obtain a pH value measurement result. The first preset signal processing includes temperature compensation processing of the first measurement signal according to the third measurement signal, and the second preset signal processing includes temperature compensation processing of the second measurement signal according to the third measurement signal.

9. The composite sensor of claim 8, wherein, The end face of the first end of the device shell is provided with a third probe hole, and part of the third detection probe extends out of the third probe hole to be exposed to the surface of the device shell.

10. A differential pressure water and fertilizer control system, characterized by, The fertilizer storage assembly includes a fertilizer storage container, a fertilizer outlet pipeline, and the composite sensor according to any one of claims 1-9, the fertilizer outlet pipeline is used to realize the communication between the fertilizer storage container and the liquid outlet pipeline, and the composite sensor is connected with the liquid outlet pipeline and is used to detect the conductivity and pH value of the liquid in the fertilizer outlet pipeline.

11. The differential pressure water nutrient control system of claim 10, wherein, The fertilizer storage assembly further includes an electric proportional valve and a liquid inlet pipeline. The electric proportional valve is provided with a first liquid inlet and a first liquid outlet. The liquid inlet pipeline is in communication with the first liquid inlet. The liquid outlet pipeline is in communication with the first liquid outlet and is used to output liquid required for irrigation or fertilization. The fertilizer storage assembly further includes a fertilizer inlet pipeline provided with a first electric valve, the fertilizer storage container is further provided with a fertilizer inlet and a fertilizer outlet, the fertilizer inlet is in communication with the liquid inlet pipeline through the fertilizer inlet pipeline, and the fertilizer outlet is in communication with the liquid outlet pipeline through the fertilizer outlet pipeline. The first electric valve is used to control the communication and closing of the fertilizer inlet pipeline, and the electric proportional valve is used to adjust the opening and closing ratio, so that a pressure difference is formed between the liquid in the first liquid inlet and the first liquid outlet, the liquid flows from the liquid inlet pipeline to the fertilizer inlet pipeline, and then enters the fertilizer storage container.

12. The differential pressure water nutrient control system of claim 11, wherein, The fertilizer storage assembly further includes a pressure detection assembly arranged adjacent to the first liquid outlet and used to detect the liquid pressure at the first liquid outlet.

13. The differential pressure water nutrient control system of claim 12, wherein, The fertilizer storage assembly further includes a first control mechanism electrically connected with the pressure detection assembly, the electric proportional valve, and the first electric valve, respectively, and used to adjust the opening and closing ratio of the electric proportional valve and control the communication and closing of the first electric valve according to the liquid pressure detected by the pressure detection assembly.

14. The differential pressure water nutrient control system of claim 13, wherein, The electric proportional valve comprises a first valve body and a first valve core, the first valve body is connected with the first control mechanism, the first valve core is arranged inside the first valve body, the first valve core comprises a first connecting piece, the first control mechanism comprises a first driving assembly, the first driving assembly comprises a second connecting piece, the first connecting piece and the second connecting piece are connected, and the first driving assembly drives the second connecting piece to rotate, so as to drive the first valve core to rotate relative to the first valve body to adjust the opening and closing ratio of the electric proportional valve.

15. The differential pressure water nutrient control system of claim 11, wherein, The differential pressure type water and fertilizer control system comprises two or more than two fertilizer storage assemblies, and further comprises a second control mechanism, the second control mechanism is electrically connected with each first electric valve and each composite sensor respectively, and the second control mechanism is further used for controlling the communication and closing of each first electric valve according to the electric conductivity detection result and the pH value detection result of each composite sensor.

16. The differential pressure water nutrient control system of claim 10, wherein, Further comprising an electric ball valve and a liquid inlet pipeline, The electric ball valve comprises a second valve body, a second valve core and a second driving assembly, the second valve body is provided with a second liquid inlet, a second liquid outlet and a communication port, the communication port is arranged adjacent to the second liquid inlet, the second valve core is arranged in the second valve body, the second valve core is provided with a third liquid inlet and a third liquid outlet, the third liquid outlet is communicated with the third liquid inlet in the interior of the second valve core, and the second driving assembly is in transmission connection with the second valve core to drive the second valve core to rotate, so that the electric ball valve can be switched between a first state and a second state. The liquid inlet pipeline is communicated with the second liquid inlet; The liquid outlet pipeline is communicated with the second liquid outlet and is used for outputting liquid required for irrigation or fertilization; The fertilizer storage assembly further comprises a fertilizer inlet pipeline, the fertilizer storage container is further provided with a fertilizer inlet and a fertilizer outlet, the fertilizer inlet is communicated with the communication port through the fertilizer inlet pipeline, and the fertilizer outlet is communicated with the liquid outlet pipeline through a fertilizer outlet pipeline; When the electric ball valve is in the first state, the third liquid inlet is communicated with the second liquid inlet, the third liquid outlet is communicated with the second liquid outlet, and the communication port is completely closed; when the electric ball valve is in the second state, the third liquid inlet is communicated with the second liquid inlet and the communication port at the same time, the third liquid outlet is communicated with the second liquid outlet, and the second liquid outlet is partially closed.

17. The differential pressure water nutrient control system of claim 16, wherein, The communication port comprises a first communication port and a second communication port, and the first communication port and the second communication port are arranged on both sides of the second liquid inlet; The electric ball valve can be rotated towards the first communication port, so that the third liquid inlet is communicated with the second liquid inlet and the first communication port at the same time, the third liquid outlet is communicated with the second liquid outlet, and the second liquid outlet is partially closed; The electric ball valve can be rotated towards the second communication port, so that the third liquid inlet is communicated with the second liquid inlet and the second communication port at the same time, the third liquid outlet is communicated with the second liquid outlet, and the second liquid outlet is partially closed.

18. The differential pressure water nutrient control system of claim 17, wherein, The two fertilizer storage assemblies are communicated with the first communication port and the second communication port respectively through the fertilizer inlet pipelines, and the fertilizer outlet pipelines of the two fertilizer storage assemblies are communicated with the liquid outlet pipeline.

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