Water and fertilizer device and water and fertilizer control system

Abstract

The utility model provides a water and fertilizer device and a water and fertilizer control system, and relates to the technical field of water and fertilizer machines. The water and fertilizer device comprises an electric control unit, a fertilizer injection control unit, a sensing detection unit, a water and fertilizer mixing unit and a water and fertilizer main pipeline, the fertilizer injection control unit comprises at least one gear pump which is electrically connected with the electric control unit, and the gear pump injects fertilizer liquid in an external fertilizer liquid device into the water and fertilizer main pipeline under the control of the electric control unit to obtain water and fertilizer mixed liquid; the sensing detection unit is arranged on the water and fertilizer main pipeline and electrically connected with the electric control unit, and the sensing detection unit detects characteristic parameter information of the water and fertilizer mixed liquid and sends the characteristic parameter information to the electric control unit, so that the electric control unit controls the gear pump according to the characteristic parameter information; the water-fertilizer mixing unit is arranged on the water-fertilizer main pipeline and used for mixing water-fertilizer mixed liquid, and the output end of the water-fertilizer main pipeline outputs the mixed water-fertilizer mixed liquid.

Description

Technical Field

[0001] The present application relates to the technical field of water and fertilizer machines, and in particular to a water and fertilizer device and a water and fertilizer control system. Background Art

[0002] The water-fertilizer device is an agricultural technology that integrates irrigation and fertilization. It mixes soluble solid or liquid fertilizers into fertilizer liquid according to the soil nutrient content and crop fertilizer requirements, and supplies water and fertilizer together with irrigation water through a controllable pipe system.

[0003] Current water-fertilizer devices typically use the Venturi effect to mix fertilizer and water. For example, a Venturi fertilizer applicator creates negative pressure by flowing water through its throat, thereby sucking fertilizer into the water and mixing it.

[0004] However, the inventors of the present application have discovered that the Venturi fertilizer applicator is a discrete fertilizer injection method, that is, it implements discontinuous fertilizer injection through PWM (Pulse Width Modulation) frequency control, which results in a problem of discontinuous fertilizer injection.

[0005] On the other hand, the fertilizer injection method based on the Venturi effect generally requires a peristaltic pump to provide pumping force, but the flow rate of the peristaltic pump is generally small and the internal resistance is large. When high flow rate is required, the speed of the peristaltic pump needs to be increased, and the high speed will reduce the life of the peristaltic pump hose; in addition, the maximum working pressure that the peristaltic pump can withstand is limited (for example, the working pressure cannot exceed 1 kg), and it needs to be equipped with a corresponding pressure reducing pipeline, which will also increase the complexity of the water and fertilizer device structure. Utility Model Content

[0006] According to one aspect of the present application, the present application provides a water-fertilizer device, comprising: an electrical control unit, a fertilizer injection control unit, a sensor detection unit, a water-fertilizer mixing unit, and a water-fertilizer main pipeline; the fertilizer injection control unit comprises: at least one gear pump, electrically connected to the electrical control unit, and under the control of the electrical control unit, the gear pump injects fertilizer liquid in an external fertilizer liquid device into the water-fertilizer main pipeline to obtain a water-fertilizer mixture; the sensor detection unit is arranged on the water-fertilizer main pipeline and electrically connected to the electrical control unit, the sensor detection unit detects characteristic parameter information of the water-fertilizer mixture, and sends the characteristic parameter information to the electrical control unit, so that the electrical control unit controls the gear pump according to the characteristic parameter information; the water-fertilizer mixing unit is arranged on the water-fertilizer main pipeline, for mixing the water-fertilizer mixture, and the output end of the water-fertilizer main pipeline outputs the mixed water-fertilizer mixture.

[0007] According to some embodiments of the present application, the water and fertilizer main pipeline comprises an input end and an output end, and the water and fertilizer device further comprises a pressure control unit, which comprises: a first pressure detector arranged at the input end and configured to detect a first liquid pressure value of the input end; a second pressure detector arranged at the output end and configured to detect a second liquid pressure value of the output end; and a power control module configured to control the flow of the liquid input into the input end according to the first liquid pressure value and / or the second liquid pressure value, so as to control the pressure difference of the water and fertilizer mixture.

[0008] According to some embodiments of the present application, the water and fertilizer device further comprises a pressure discharge unit arranged on the water and fertilizer main pipeline to discharge air in the water and fertilizer main pipeline.

[0009] According to some embodiments of the present application, the electric control unit comprises: a control mainboard configured to generate a control instruction according to the characteristic parameter information and a preset target value; and a drive controller electrically connected with the control mainboard and configured to drive the gear pump according to the control instruction.

[0010] According to some embodiments of the present application, the sensing and detecting unit comprises: an electric conductivity detecting sensor arranged at the output end of the water and fertilizer mixing unit and configured to detect electric conductivity information of the water and fertilizer mixture; and a pH value detecting sensor arranged at the output end of the water and fertilizer mixing unit and configured to detect pH value information of the water and fertilizer mixture.

[0011] According to some embodiments of the present application, the electric conductivity detecting sensor is arranged at a first angle with the water and fertilizer main pipeline, and the pH value detecting sensor is arranged at a second angle with the water and fertilizer main pipeline; the first angle ranges from 30° to 45°, and the second angle ranges from 30° to 45°.

[0012] According to some embodiments of the present application, the electric control unit further comprises: an air inlet module arranged at one side of the electric control unit; an air outlet module arranged at one side of the electric control unit and on the same side as the air inlet module; and a heat dissipation module arranged at one side of the electric control unit, so that a heat dissipation air duct is formed between the air inlet module and the air outlet module under the action of the heat dissipation module.

[0013] According to some embodiments of the present application, the water and fertilizer device further comprises a fixing unit, and the electric control unit, the fertilizer injection control unit, the sensing and detecting unit, the water and fertilizer mixing unit and the water and fertilizer main pipeline are integrally arranged in the fixing unit.

[0014] According to some embodiments of the present application, the fixing unit comprises a first fixing unit and a second fixing unit; the electric control unit and the fertilizer injection control unit are arranged on the first fixing unit; the sensing and detecting unit, the water and fertilizer mixing unit and the water and fertilizer main pipeline are arranged on the second fixing unit; and the first fixing unit and the second fixing unit are detachably connected.

[0015] According to another aspect of the present application, the present application also provides a water and fertilizer control system, comprising a remote control terminal and the water and fertilizer device described above, the remote control terminal and the water and fertilizer device are in communication connection to remotely control the water and fertilizer device.

[0016] The water and fertilizer device provided by the present application comprises an electric control unit, a fertilizer injection control unit, a sensing detection unit, a water and fertilizer mixing unit and a water and fertilizer main pipeline, the fertilizer injection control unit comprises at least one gear pump. The present application can realize continuous linear control by replacing the traditional peristaltic pump with a gear pump, and solves the problem of discontinuous fertilizer injection. In addition, the gear pump can be controlled by the electric control unit, and high speed can be realized, so as to realize dynamic regulation and control of fertilizer injection.

[0017] The water and fertilizer device provided by the present application can also provide a larger working pressure (for example, 10-20 kg), and the setting of the gear pump can eliminate the structure setting of the pressure reducing pipeline, and has the characteristics of simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 A schematic diagram of the water and fertilizer device of the embodiment of the present application is shown;

[0020] Figure 2 A schematic diagram of the fertilizer injection control unit of the embodiment of the present application is shown;

[0021] Figure 3 Another schematic diagram of the water and fertilizer device of the embodiment of the present application is shown;

[0022] Figure 4 A schematic diagram of the electric control unit of the embodiment of the present application is shown;

[0023] Figure 5 A schematic diagram of the fixing unit of the embodiment of the present application is shown.

[0024] Explanation of reference signs:

[0025] Electric control unit 10, fertilizer injection control unit 20, sensing detection unit 30, water and fertilizer mixing unit 40 and water and fertilizer main pipeline 50; pressure control unit 60; fixing unit 70;

[0026] Air inlet module 11, air outlet module 12 and heat dissipation module 13; heat dissipation air duct 14

[0027] Gear pump 21; external fertilizer solution device 22; fertilizer injection pipeline 211;

[0028] Conductivity detection sensor 31 and pH detection sensor 32;

[0029] Input end 51; output end 52;

[0030] First pressure detector 61 and second pressure detector 62; power control module 63.

[0031] First fixing unit 71; second fixing unit 72; handheld support 711. DETAILED DESCRIPTION

[0032] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the several views.

[0033] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the

[0034] Moreover, the terms "first," "second," "third," etc. are used herein to describe various elements, but do not connote an ordering, such as one before another, but rather are used to distinguish one element from another.

[0035] The terms "first," "second," and the like, herein do not denote any ordinal, chronological or spatial relationship. These terms are just used to distinguish one element from another.

[0036] The technical solutions in the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] According to an aspect of the present application, the present application provides a water and fertilizer device, which comprises an electric control unit 10, a fertilizer injection control unit 20, a sensing detection unit 30, a water and fertilizer mixing unit 40 and a water and fertilizer main pipeline 50.

[0038] According to an example embodiment, as shown in Figure 1 The electric control unit 10 can be an electric control box arranged at the top of the water and fertilizer device.

[0039] According to an example embodiment, the fertilizer injection control unit 20 comprises at least one gear pump 21 electrically connected with the electric control unit 10. The gear pump 21 injects fertilizer liquid in an external fertilizer liquid device 22 into the water and fertilizer main pipeline 50 under the control of the electric control unit 10 to obtain water and fertilizer mixed liquid.

[0040] As shown in Figure 2 The fertilizer injection control unit 20 comprises three gear pumps 21, and each gear pump 21 is connected with one external fertilizer liquid device 22. Figure 2 As shown in The gear pump 21 further comprises a fertilizer injection pipeline 211. The gear pump 21 is electrically connected with the electric control unit 10, and the gear pump 21 injects the fertilizer liquid in the external fertilizer liquid device 22 into the water and fertilizer main pipeline 50 through the fertilizer injection pipeline 211 under the control of the electric control unit 10.

[0041] Figure 2 For example, as shown in The input end of the fertilizer injection pipeline 211 is connected with the external fertilizer liquid device 22 to obtain the fertilizer liquid from the external fertilizer liquid device 22, and the output end of the fertilizer injection pipeline 211 is connected with the water and fertilizer main pipeline 50 to inject the obtained fertilizer liquid into the water and fertilizer main pipeline 50.

[0042] Exemplarily, the external fertilizer liquid device 22 can be a fertilizer liquid barrel for carrying pre-set fertilizer liquid.

[0043] Optionally, the electric control unit 10 can control the fertilizer injection flow rate of the gear pump 21 by controlling the rotation speed of the gear pump 21, so as to adjust the fertilizer injection ratio of the water and fertilizer device.

[0044] Optionally, the gear pump 21 can be made of PEEK (polyether ether ketone) material, which has high strength, high temperature resistance, high rigidity and good chemical resistance (such as acid and alkali resistance, hydrolysis resistance, wear resistance, etc.).

[0045] According to an example embodiment, the sensing detection unit 30 is arranged on the water and fertilizer main pipeline 50 and electrically connected with the electric control unit 10. The sensing detection unit 30 detects characteristic parameter information of the water and fertilizer mixed liquid and sends the characteristic parameter information to the electric control unit 10, so that the electric control unit 10 controls the gear pump 21 according to the characteristic parameter information.

[0046] Figure 1As shown, the sensing detection unit 30 collects the characteristic parameter information of the water and fertilizer mixture in the water and fertilizer main pipeline 50, and feeds back the characteristic parameter information to the electric control unit 10. The electric control unit 10 compares the received characteristic parameter information with the system preset value, judges whether the current characteristic parameter information can meet the irrigation demand of the plants, and further performs corresponding adjustment control.

[0047] Optionally, the electric control unit 10 can include a control mainboard and a drive controller. The control mainboard generates a control instruction according to the characteristic parameter information and the preset target value. The drive controller is electrically connected with the control mainboard and drives the gear pump 21 according to the control instruction.

[0048] For example, when the current characteristic parameter information is lower than the system preset value, the electric control unit 10 generates an acceleration control instruction to control the gear pump 21 to increase the rotating speed, so as to increase the fertilizer water ratio in the water and fertilizer mixture; when the current characteristic parameter information is higher than the system preset value, the electric control unit 10 generates a deceleration control instruction to control the gear pump 21 to decrease the rotating speed, so as to decrease the fertilizer water ratio in the water and fertilizer mixture, so that the electric control unit 10 can realize dynamic regulation and control of the nutrient components in the fertilizer water.

[0049] According to the example embodiment, the water and fertilizer mixing unit 40 is arranged on the water and fertilizer main pipeline, for mixing the water and fertilizer mixture, and the output end 52 of the water and fertilizer main pipeline 50 outputs the mixed water and fertilizer mixture.

[0050] For example, as shown in FIG. 4, the water and fertilizer mixing unit 40 is a T-shaped filter (with a 120-mesh filter screen). Figure 1 As shown, when the fertilizer solution enters the water and fertilizer main pipeline 50 through the gear pump 21, the fertilizer solution is first mixed with the water in the water and fertilizer main pipeline 50 to obtain the water and fertilizer mixture. Then, when the water and fertilizer mixture passes through the water and fertilizer mixing unit 40 in the water and fertilizer main pipeline 50, the water and fertilizer mixing unit 40 can further mix the water and fertilizer mixture.

[0051] For example, as shown in FIG. 4, the water and fertilizer mixing unit 40 is a T-shaped filter (with a 120-mesh filter screen). Figure 1 As shown, the water is input from the input end 51 of the water and fertilizer main pipeline 50, and after the fertilizer solution from the gear pump 21 is fully mixed twice, the target water and fertilizer mixture is obtained and finally output from the output end 52 of the water and fertilizer main pipeline 50, and finally output to the target irrigation site, so that the water and fertilizer mixing and the irrigation of the plants can be realized.

[0052] Through the above example embodiment, the water and fertilizer device provided by the present application includes an electric control unit, a fertilizer injection control unit, a sensing detection unit, a water and fertilizer mixing unit, and a water and fertilizer main pipeline. The fertilizer injection control unit includes at least one gear pump. The present application can realize continuous linear control by replacing the traditional peristaltic pump with a gear pump, and solves the problem of discontinuous fertilizer injection. In addition, the gear pump can be controlled by the electric control unit, and can realize high rotating speed, so as to realize dynamic regulation and control of the fertilizer injection.

[0053] The water and fertilizer device provided by the application can also provide a larger working pressure (for example, 10-20 kg), and the gear pump can be provided without a pressure reducing pipeline, and has the characteristics of simple structure.

[0054] Optionally, as shown in Figure 3 The water and fertilizer device also includes a pressure control unit 60. The pressure control unit 60 includes a first pressure detector 61, a second pressure detector 62, and a power control module 63 (not shown in the figure).

[0055] As shown in Figure 3 The water and fertilizer main pipeline 50 includes an input end 51 and an output end 52. The first pressure detector 61 is arranged at the input end 51 (as shown above the input end 51) to detect the first liquid pressure value of the input end 51. The second pressure detector 62 is arranged at the output end 52 to detect the second liquid pressure value of the output end 52. Figure 3

[0056] The power control module 63 controls the flow of the liquid input to the input end 51 according to the first liquid pressure value and / or the second liquid pressure value to control the pressure difference of the water and fertilizer mixture.

[0057] For example, the first pressure detector 61 and the second pressure detector 62 are both pressure gauges, and the power control module 63 is a power pump. When water enters the water and fertilizer main pipeline 50 from the input end 51, the first pressure detector 61 and the second pressure detector 62 detect the liquid pressure in the water and fertilizer main pipeline 50 in real time and send the pressure detection value to the power control module 63. The power control module 63 controls the flow of water in the water and fertilizer main pipeline 50 according to the pressure detection value, so as to control the pressure difference of the water and fertilizer mixture.

[0058] In this way, on the one hand, the pressure difference of the water and fertilizer mixture in the water and fertilizer main pipeline 50 can be stabilized; on the other hand, the resistance of the water and fertilizer main pipeline 50 when the fertilizer injection control unit 20 injects fertilizer into the water and fertilizer main pipeline 50 can be reduced through the arrangement of the power control module 63.

[0059] Optionally, the water and fertilizer device can also include a pressure relief unit arranged on the water and fertilizer main pipeline 50 to discharge the air in the water and fertilizer main pipeline 50.

[0060] For example, when the fertilizer solution enters the water and fertilizer main pipeline 50 through the gear pump 21, air is generally mixed in the fertilizer injection pipeline 211, so that there is excess air in the water and fertilizer main pipeline 50.

[0061] Through the arrangement of the pressure relief unit, the excess air in the water and fertilizer main pipeline 50 can be discharged, so as to improve the utilization rate of the flow.

[0062] ​Exemplarily, the pressure relief unit can be a pressure relief valve.

[0063] Optionally, the sensing and detecting unit 30 comprises an electric conductivity detecting sensor 31 and a pH value detecting sensor 32.

[0064] The electric conductivity detecting sensor 31 is arranged at the output end of the water and fertilizer mixing unit 40 to detect the electric conductivity information of the water and fertilizer mixture. The pH value detecting sensor 32 is arranged at the output end of the water and fertilizer mixing unit 40 to detect the pH value information of the water and fertilizer mixture.

[0065] For example, as shown in Figure 3 The electric conductivity detecting sensor 31 (EC sensor) and the pH value detecting sensor 32 (PH sensor) collect the EC value and the PH value of the water and fertilizer mixture and send the collected EC value and PH value of the water and fertilizer mixture to the electric control unit 10. The electric control unit 10 dynamically adjusts the proportion of the water and fertilizer mixture according to the received EC value and PH value.

[0066] As shown in Figure 3 The electric conductivity detecting sensor 31 (EC sensor) and the pH value detecting sensor 32 (PH sensor) are both arranged at the output end of the water and fertilizer mixing unit 40.

[0067] In this way, the characteristic parameter information collected by the sensing and detecting unit 30 is of the water and fertilizer mixture after sufficient mixing, so as to ensure the detection accuracy of the sensing and detecting unit 30.

[0068] Optionally, the electric conductivity detecting sensor 31 is arranged at a first angle with the water and fertilizer main pipeline 50, and the pH value detecting sensor 32 is arranged at a second angle with the water and fertilizer main pipeline 50.

[0069] The first angle ranges from 30° to 45°, and the second angle ranges from 30° to 45°.

[0070] Exemplarily, the electric conductivity detecting sensor 31 is arranged at a 45° angle with the water and fertilizer main pipeline 50, and the pH value detecting sensor 32 is arranged at a 45° angle with the water and fertilizer main pipeline 50.

[0071] In this way, the electric conductivity detecting sensor 31 and the pH value detecting sensor 32 have a certain contact angle with the water and fertilizer mixture, which can avoid the problem of insufficient contact area between the sensor and the water and fertilizer mixture due to the limitation of the vertical arrangement space when the contact angle is too large, thereby affecting the measurement accuracy.

[0072] Optionally, as shown in Figure 4 The gear pump 21 is integrated in the electric control unit 10. The electric control unit 10 further comprises an air inlet module 11, an air outlet module 12 and a heat dissipation module 13.

[0073] The air inlet module 11 is arranged on one side of the electric control unit 10, the air outlet module 12 is arranged on one side of the electric control unit 10, and is arranged on the same side as the air inlet module 11. The heat dissipation module 13 is arranged on one side of the electric control unit 10. Under the action of the heat dissipation module 13, the air inlet module 11 and the air outlet module 12 form a heat dissipation air duct 14 therebetween.

[0074] Optionally, as shown in Figure 4 The heat dissipation module 13 includes a heat dissipation fan 131 and a heat dissipation baffle 132.

[0075] For example, the air inlet module 11 is an air inlet, the air outlet module 12 is an air outlet, and the air blown by the heat dissipation fan 131 is blocked by the heat dissipation baffle 132 and changes direction, and is discharged from the air outlet.

[0076] By arranging the heat dissipation module 13, the heat dissipation air duct 14 as shown in Figure 5 can be formed inside the electric control unit 10.

[0077] In this way, the gear pump 21 can be cooled in time to ensure the normal operation of the gear pump 21, thereby ensuring the service life of the gear pump 21.

[0078] Optionally, as shown in Figure 1 The water and fertilizer device further includes a fixing unit 70, and the electric control unit 10, the fertilizer injection control unit 20, the sensing and detecting unit 30, the water and fertilizer mixing unit 40 and the water and fertilizer main pipeline 50 are integrally arranged in the fixing unit 70.

[0079] For example, the fixing unit 70 is a fixing support, and the electric control unit 10, the fertilizer injection control unit 20, the sensing and detecting unit 30, the water and fertilizer mixing unit 40 and the water and fertilizer main pipeline 50 are integrally arranged on the fixing support.

[0080] In this way, the water and fertilizer device can be integrated on one device, avoiding the complicated structure of traditional devices that need multiple fixing supports. The water and fertilizer device provided by the present application has the characteristics of simple structure.

[0081] Optionally, as shown in Figure 5 The fixing unit 70 further includes a first fixing unit 71 and a second fixing unit 72. The electric control unit 10 and the fertilizer injection control unit 20 are arranged on the first fixing unit 71, and the sensing and detecting unit 30, the water and fertilizer mixing unit 40 and the water and fertilizer main pipeline 50 are arranged on the second fixing unit 72. The first fixing unit 71 and the second fixing unit 72 are detachably connected.

[0082] For example, by detachably connecting the first fixing unit 71 and the second fixing unit 72, the electric control unit 10 and the fertilizer injection control unit 20 arranged on the first fixing unit 71 can be detachably connected with other components. In this way, the mobility and operability of the electric control unit 10 and the fertilizer injection control unit 20 can be improved.

[0083] Optionally, the first fixing unit 71 is further provided with a handheld support 711. As shown in the drawings, two handheld supports 711 are arranged on the two sides of the first fixing unit 71, so as to facilitate the user to move the first fixing unit 71 through the handheld supports 711. Figure 5

[0084] According to another aspect of the present application, the present application provides a water and fertilizer control system, which comprises a remote control terminal and the water and fertilizer device described above. According to an example embodiment, the remote control terminal and the water and fertilizer device are communicatively connected, and the water and fertilizer device can be remotely controlled.

[0085] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.​

Claims

1. A water and fertilizer device, characterized by, The water and fertilizer device comprises an electric control unit, a fertilizer injection control unit, a sensing and detecting unit, a water and fertilizer mixing unit and a water and fertilizer main pipeline; The fertilizer injection control unit comprises: At least one gear pump, which is electrically connected to the electric control unit, under the control of the electric control unit, injects fertilizer liquid in an external fertilizer liquid device into the water and fertilizer main pipeline to obtain water and fertilizer mixed liquid; The sensing and detecting unit is arranged on the water and fertilizer main pipeline and is electrically connected to the electric control unit, detects characteristic parameter information of the water and fertilizer mixed liquid, and sends the characteristic parameter information to the electric control unit, so that the electric control unit controls the gear pump according to the characteristic parameter information; The water and fertilizer mixing unit is arranged on the water and fertilizer main pipeline and is used for mixing the water and fertilizer mixed liquid, and an output end of the water and fertilizer main pipeline outputs the mixed water and fertilizer mixed liquid.

2. The water and fertilizer apparatus according to claim 1, characterized by, The water and fertilizer main pipeline comprises an input end and an output end, and the water and fertilizer device further comprises a pressure control unit, which comprises: A first pressure detector arranged at the input end and detecting a first liquid pressure value of the input end; A second pressure detector arranged at the output end and detecting a second liquid pressure value of the output end; A power control module controlling the flow of liquid input into the input end according to the first liquid pressure value and / or the second liquid pressure value to control the pressure difference of the water and fertilizer mixed liquid.

3. The water and fertilizer apparatus of claim 1, wherein, The water and fertilizer device further comprises: A pressure discharge unit arranged on the water and fertilizer main pipeline to discharge air in the water and fertilizer main pipeline.

4. The water and fertilizer apparatus of claim 1, wherein The electric control unit comprises: A control mainboard generating a control instruction according to the characteristic parameter information and a preset target value; A drive controller electrically connected to the control mainboard and driving the gear pump according to the control instruction.

5. The water and fertilizer apparatus of claim 1, wherein The sensing and detecting unit comprises: An electric conductivity detecting sensor arranged at an output end of the water and fertilizer mixing unit to detect electric conductivity information of the water and fertilizer mixed liquid; A pH value detecting sensor arranged at the output end of the water and fertilizer mixing unit to detect pH value information of the water and fertilizer mixed liquid.

6. The water and fertilizer device according to claim 5, characterized in that: The electric conductivity detecting sensor is arranged at a first angle with the water and fertilizer main pipeline, and the pH value detecting sensor is arranged at a second angle with the water and fertilizer main pipeline; The first angle ranges from 30° to 45°, and the second angle ranges from 30° to 45°.

7. The water and fertilizer apparatus of claim 1, wherein The electric control unit further comprises: An air inlet module arranged at one side of the electric control unit; An air outlet module arranged at one side of the electric control unit and on the same side as the air inlet module; A heat dissipation module arranged at one side of the electric control unit, and under the action of the heat dissipation module, a heat dissipation air duct is formed between the air inlet module and the air outlet module.

8. The water and fertilizer apparatus of claim 1, wherein, The water and fertilizer device further comprises: A fixing unit, and the electric control unit, the fertilizer injection control unit, the sensing and detecting unit, the water and fertilizer mixing unit and the water and fertilizer main pipeline are integrally arranged in the fixing unit.

9. The hydroponic apparatus of claim 8, wherein, The fixing unit comprises a first fixing unit and a second fixing unit; The electric control unit and the fertilizer injection control unit are arranged on the first fixing unit; The sensing and detecting unit, the water and fertilizer mixing unit and the water and fertilizer main pipeline are arranged on the second fixing unit. The first fixing unit and the second fixing unit are detachably connected.

10. A water and fertilizer control system, characterized by, The water and fertilizer device and a remote control terminal are connected in communication, so as to remotely control the water and fertilizer device.

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