A portable pH meter with a distillation function

Abstract

This invention relates to the field of soil testing technology, and more specifically, to a portable pH meter with distillation function. The meter includes a main body, a power module, a water storage module, a distillation module, and a controller for controlling the distillation module. Both the water storage module and the distillation module are fixedly connected to the main body, and the distillation module is electrically connected to the controller. Both the distillation module and the main body are electrically connected to the power module. The water storage module has a first inlet for water injection and a first outlet for water delivery to the distillation module. The distillation module has a second inlet and a second outlet for water intake. The first outlet and the second inlet are connected, and a first valve is provided between them. Distilled water can be prepared on-site using the distillation module, eliminating the need for an external pure water source. This effectively solves the problem of pure water shortage in field operations, standardizes water quality sources, reduces measurement errors, and improves data consistency and experimental repeatability.

Description

Technical Field

[0001] This invention relates to the field of soil testing technology, and more specifically, to a portable pH meter with distillation function. Background Technology

[0002] In field operations such as agricultural planting, environmental monitoring, geological exploration, and ecological restoration, soil pH is a key indicator guiding crop fertilization, land planning, and pollution control. Its detection process requires the use of high-purity distilled water to prepare soil suspensions and clean the electrodes to avoid measurement errors caused by ion interference. Field operations often face challenges such as distance from laboratories and lack of a stable supply of pure water. Existing portable soil pH meters generally rely on external bottled distilled water, which not only increases the burden of carrying the equipment but also easily leads to interruptions in testing due to water depletion, severely impacting work efficiency and data continuity. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies that rely on external pure water sources, and to provide a portable pH meter with distillation function that can prepare distilled water on-site without relying on external pure water sources.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A portable pH meter with distillation function is provided, comprising a meter body, a power module, a water storage module, a distillation module, and a controller for controlling the distillation module. The water storage module and the distillation module are both fixedly connected to the meter body, the distillation module is electrically connected to the controller, and the distillation module and the meter body are both electrically connected to the power module. The water storage module is provided with a first water inlet for filling water and a first water outlet for supplying water to the distillation module. The distillation module is provided with a second water inlet and a second water outlet for taking water. The first water outlet is connected to the second water inlet, and a first valve is provided between the first water outlet and the second water inlet.

[0005] This invention relates to a portable pH meter with distillation function. In use, natural water is collected and stored in a water storage module through a first inlet. Opening the first valve allows water from the storage module to flow into the distillation module through the first outlet. A controller operates the distillation module, which distills the water to produce distilled water. This distilled water is then taken out through a second outlet and mixed with the soil sample to prepare a soil suspension. The pH value of the soil suspension is measured using the meter itself, thus determining the soil's pH. Distilled water can be prepared on-site using the distillation module, eliminating the need for external purified water sources. This effectively addresses the industry pain point of purified water shortages in field operations, standardizes water quality sources, reduces measurement errors, and improves data consistency and experimental repeatability.

[0006] Furthermore, the distillation module includes a second outer shell, a distillation chamber, a heating device, a condensing device, and a temporary storage chamber. The second outer shell is fixedly connected to the main body of the measuring instrument. The distillation chamber, the heating device, the condensing device, and the temporary storage chamber are all installed inside the second outer shell. The second water inlet and the second water outlet are located on the second outer shell. The heating device is installed at the bottom of the distillation chamber. The bottom of the inner cavity of the distillation chamber is connected to the second water inlet. The top of the inner cavity of the distillation chamber is connected to the condensing device. The condensing device is connected to the temporary storage chamber. The temporary storage chamber is connected to the second water outlet. A second valve is provided on the second water outlet. The heating device is electrically connected to the power module and the controller. When preparing distilled water, the water in the water storage module is opened and flows into the distillation chamber through the first outlet and the second inlet. The controller heating device heats the distillation chamber, causing the water in the distillation chamber to boil. The generated steam enters the condenser and is condensed into pure distilled water. The distilled water flows into the temporary storage chamber for storage. When it is necessary to test the pH value, the second valve is opened and the distilled water in the temporary storage chamber is poured out through the second outlet and mixed with the soil sample to prepare a soil suspension.

[0007] Furthermore, a heat insulation plate is provided between the second outer shell and the main body of the measuring instrument. The heat insulation plate can isolate the heat between the distillation module and the main body of the measuring instrument, preventing the high temperature generated by the heating device during the distillation process from affecting the detection circuit and interfering with the detection results of the measuring device.

[0008] Furthermore, the distillation module also includes a liquid level sensor and a temperature sensor, both of which are located in the distillation chamber. The first valve is a solenoid valve. The liquid level sensor, the temperature sensor, the heating device, and the first valve are all electrically connected to the controller and to the power supply module. During the process of adding water to the distillation chamber, if the level sensor detects that the liquid level in the distillation chamber is too high, it sends a signal to the controller. The controller then closes the first valve, blocking the second water inlet to prevent water from overflowing into the condenser and contaminating the distilled water. The temperature sensor monitors the water temperature in the distillation chamber in real time and sends a signal to the controller. During the heating process of the distillation chamber, if the temperature sensor detects that the water temperature has risen to 98°C, the controller controls the heating device to reduce its power to maintain a gentle boil, preventing violent boiling that could cause water to splash out of the distillation chamber and into the condenser, thus contaminating the distilled water. If the level sensor detects that the liquid level in the distillation chamber is too low, it sends a signal to the controller, which then stops the heating device to prevent dry burning. If the level sensor malfunctions and the liquid level is too low, and the temperature sensor detects an abnormal increase in the steam temperature in the distillation chamber, the controller stops the heating device, improving the reliability of the measuring instrument.

[0009] Furthermore, the condensation device includes a fan and several condenser tubes. The fan is installed inside the second housing, which has a vent. The fan's outlet faces the condenser tubes. One end of each condenser tube is connected to the distillation chamber, and the other end is connected to the temporary storage chamber. The fan 342 is electrically connected to the power module and the controller. When distillation begins, the fan is turned on to blow air into the condenser tubes. Steam flows from the distillation chamber into the condenser tubes. The fan accelerates the airflow on the outer surface of the condenser tubes, increasing heat exchange efficiency and rapidly reducing the steam temperature, causing the steam to condense into distilled water.

[0010] Furthermore, the distillation module also includes a second water supply pipe, which is connected to the second water outlet. The second water supply pipe is a flexible hose. When distilled water is needed, the second valve is opened to allow the distilled water to flow out through the second water supply pipe. The second water supply pipe is a flexible hose, and the water outlet position can be freely adjusted by bending the second water supply pipe for convenient use.

[0011] Furthermore, the water storage module includes a housing and a filtration device. The first inlet is located at the top of the housing, and the first outlet is located at the bottom of the housing. The filtration device is fixedly installed on the inner wall of the housing, dividing the inner cavity of the housing into a filtration chamber and a water storage chamber. The filtration chamber is connected to the first inlet, and the water storage chamber is connected to the first outlet. In use, collected natural water is injected into the housing through the first inlet. After being filtered by the filtration device, it enters the distillation module through the first outlet under the action of gravity. The filtration device removes some impurities from the water, preventing blockage of the first outlet and the second inlet.

[0012] Furthermore, the water storage module also includes a cover, which is located on the top of the tank and is used to open or close the first water inlet. In use, the cover is opened, and the collected natural water source is injected into the tank through the first water inlet. After the tank stores enough water, the cover is closed to prevent external dust and debris from entering the water storage module, reducing the frequency of clogging of the filter device and reducing the number of cleaning operations.

[0013] Furthermore, the filtration device includes a filter screen, an activated carbon layer, and a cotton filter element arranged sequentially in a direction away from the first water inlet. The filter screen can intercept large suspended solids such as sand and soil particles in the water source, playing a primary filtration role; the activated carbon layer adsorbs organic matter, odors, and some colored impurities in the water source, performing a second filtration; the cotton filter element can further remove fine suspended solids, colloids, and some bacteria in the water, performing a third filtration; the three filtrations effectively reduce impurities in the water source, preventing clogging, and providing a clean pre-treated water source for the subsequent distillation process, thus improving the quality of the distilled water.

[0014] Furthermore, the power module includes a first power supply and a second power supply. The first power supply is electrically connected to the main body of the measuring instrument, and the second power supply is electrically connected to the distillation module. Isolation converters are provided between the first power supply and the main body of the measuring instrument, and between the second power supply and the distillation module. The first power supply and the second power supply independently supply power to the main body of the measuring instrument and the distillation module, respectively. By setting up isolation converters, electrical isolation between the first power supply and the second power supply can be achieved, avoiding electromagnetic interference and voltage fluctuations caused by the large current generated when the second power supply supplies power to the distillation module, which could affect the normal operation of the circuits inside the measuring instrument and ensure the stability of the pH reading.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The portable pH meter with distillation function of the present invention has the following advantages: 1. It can prepare distilled water on-site through the distillation module, without relying on an external pure water source, effectively solving the problem of pure water shortage in field operations; 2. The heat insulation plate can isolate the heat between the second shell and the main body of the meter, avoiding the high temperature generated by the heating device during the distillation process from affecting the circuit inside the main body of the meter; 3. The filtration device performs three filtrations on the water source to fully reduce impurities in the water source, avoid clogging, and provide a clean pre-treated water source for subsequent distillation processes, thereby improving the water quality of the distilled water. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the portable pH meter with distillation function of the present invention. Figure 2 This is a schematic diagram of the distillation module of the portable pH meter with distillation function of the present invention. Figure 3 This is a schematic diagram of the water storage module of the portable pH meter with distillation function of the present invention. Figure 4 This is a schematic diagram of the first outer shell and the human-computer interaction unit of the portable pH meter with distillation function of the present invention.

[0017] In the attached diagram: 1. Main body of the measuring instrument; 11. First outer shell; 12. Human-machine interface unit; 121. Display screen; 122. Control buttons; 13. Detector head; 131. Reference electrode; 132. pH electrode interface; 2. Water storage module; 21. Housing; 211. First water outlet; 212. First water inlet; 22. Cover; 23. Filter device; 3. Distillation module; 31. Second outer shell; 32. Distillation chamber; 33. Heating device; 34. Condensation device; 341. Condenser tube; 342. Fan; 35. Temporary storage chamber; 36. Second water inlet; 37. Second water outlet; 38. First water supply pipe; 39. Second water supply pipe; 310. Liquid level sensor; 3110. Temperature sensor; 3111. First valve; 3112. Second valve. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0019] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] Example 1 like Figures 1 to 4 The first embodiment of the portable pH meter with distillation function of the present invention is shown. It includes a meter body 1, a power module, a water storage module 2, a distillation module 3, and a controller for controlling the distillation module 3. The water storage module 2 and the distillation module 3 are both fixedly connected to the meter body 1. The distillation module 3 is electrically connected to the controller. The distillation module 3 and the meter body 1 are both electrically connected to the power module. The water storage module 2 is provided with a first water inlet and a first water outlet 211. The distillation module 3 is provided with a second water inlet 36 and a second water outlet 37. The first water outlet 211 is connected to the second water inlet 36. A first valve 3111 is provided between the first water outlet 211 and the second water inlet 36.

[0021] The portable pH meter with distillation function of the present invention collects natural water from a source and stores it in the water storage module 2 through the first inlet 212. The first valve 3111 is opened, and the water in the water storage module 2 flows into the distillation module 3 through the first outlet 211. The controller controls the distillation module 3 to distill the water, producing distilled water. The distilled water is then taken out from the second outlet 37 and mixed with the soil to be tested to prepare a soil suspension. The pH value of the soil suspension is measured using the main body 1 of the meter, thereby determining the pH of the soil. Distilled water can be prepared on-site through the distillation module 3, eliminating the need for an external pure water source. This effectively solves the industry pain point of pure water shortage in field operations, standardizes water quality sources, reduces measurement errors, and improves data consistency and experimental repeatability.

[0022] In this embodiment, as Figure 1 As shown, the main body 1 of the measuring instrument includes a first outer shell 11, a detection head 13, and a detection circuit for measuring the potential difference of the detection head 13 and processing it into a pH value. The first outer shell 11 is fixedly connected to the water storage module 2 and the distillation module 3. The detection circuit and the power module are installed inside the first outer shell 11. A human-machine interface unit 12 is provided on the first outer shell 11. The detection head 13 and the human-machine interface unit 12 are both electrically connected to the detection circuit, and both the detection circuit and the human-machine interface unit 12 are electrically connected to the power module. In use, distilled water is prepared using the distillation module 3. After preparing a soil suspension with soil and distilled water, the detection head 13 is inserted into the soil suspension. The detection circuit measures the potential difference generated by the detection head 13 in the soil suspension and processes it into a corresponding pH value. The detection result is transmitted to the human-machine interface unit 12 for display, thus completing the determination of soil pH.

[0023] like Figure 4 As shown, the human-machine interaction unit 12 includes a display screen 121 and control buttons 122; the detection head 13 includes a reference electrode 131, a pH electrode interface 132 and a pH electrode connected in sequence. The reference electrode 131 and the pH electrode interface 132 are both electrically connected to the detection circuit, and the pH electrode is electrically connected to the pH electrode interface 132; the first housing 11 contains a main board, and the detection circuit and controller are integrated on the main board; the main board is made of epoxy fiberglass cloth substrate and coated with three-proof paint (moisture-proof, salt spray-proof, and mildew-proof) to adapt to harsh outdoor environments.

[0024] Example 2 This embodiment is the second embodiment of the portable pH meter with distillation function of the present invention. This embodiment is similar to the first embodiment, except that, as shown in the following... Figure 2As shown, the distillation module 3 includes a second outer shell 31, a distillation chamber 32, a heating device 33, a condensing device 34, and a temporary storage chamber 35. The second outer shell 31 is fixedly connected to the main body 1 of the measuring instrument. The distillation chamber 32, the heating device 33, the condensing device 34, and the temporary storage chamber 35 are all installed inside the second outer shell 31. The second water inlet 36 and the second water outlet 37 are provided on the second outer shell 31. The heating device 33 is installed at the bottom of the distillation chamber 32. The bottom of the inner cavity of the distillation chamber 32 is connected to the second water inlet 36. The top of the inner cavity of the distillation chamber 32 is connected to the condensing device 34. The condensing device 34 is connected to the temporary storage chamber 35. The temporary storage chamber 35 is connected to the second water outlet 37. The second water outlet 37 is provided with a second valve 3112. The heating device 33 is electrically connected to the power module and the controller. When preparing distilled water, the water in the water storage module 2 is opened through the first outlet 211 and the second inlet 36 and flows into the distillation chamber 32. The controller controls the heating device 33 to heat the distillation chamber 32, causing the water in the distillation chamber 32 to boil. The generated steam enters the condenser 34 and is condensed into pure distilled water. The distilled water flows into the temporary storage chamber 35 for storage. When it is necessary to test the pH value, the second valve 3112 is opened and the distilled water in the temporary storage chamber 35 is poured out through the second outlet 37 and mixed with the soil sample to prepare a soil suspension.

[0025] like Figure 1 and Figure 2 As shown, the distillation chamber 32 is welded from 304 stainless steel and has a volume of 200mL. The distillation chamber 32 is equipped with a third water inlet and a steam outlet. The steam outlet is connected to the condenser 34. A first water supply pipe 38 connects the first water outlet 211 and the third water inlet. The first water supply pipe 38 passes through the second water inlet 36. The end of the first water supply pipe 38 has a quick-connect fitting for easy cleaning and replacement. The first water supply pipe 38 is a high-temperature resistant silicone tube with an inner diameter of 8mm and a wall thickness of 2mm. The inner wall of the first water supply pipe 38 is coated with polytetrafluoroethylene to prevent scale buildup. A second water supply pipe 39 is provided on the second water outlet 37. Distilled water flows out through the second water supply pipe 39, which is a flexible hose, allowing for easy adjustment of the water outlet position.

[0026] The heating device 33 is a ceramic heating plate with an adjustable power range of 300-500W and a heating surface diameter of 40mm. Thermally conductive silicone grease with a thermal conductivity ≥1.2W / (m²) is applied between the heating device 33 and the outer bottom surface of the distillation chamber 32. K) ensures efficient heat transfer.

[0027] A heat insulation plate is installed between the second outer shell 31 and the main body 1 of the measuring instrument. The heat insulation plate can isolate the heat between the distillation module 3 and the main body 1 of the measuring instrument, and prevent the high temperature generated by the heating device 33 during the distillation process from affecting the circuit inside the main body 1 of the measuring instrument and interfering with the detection results of the detection device. The heat insulation plate is made of ceramic fiber heat insulation material with a thickness of 5mm.

[0028] like Figure 2 As shown, the distillation module 3 also includes a liquid level sensor 310 and a temperature sensor 3110. Both the liquid level sensor 310 and the temperature sensor 3110 are located in the distillation chamber 32. The first valve 3111 is a solenoid valve. The liquid level sensor 310, the temperature sensor 3110, the heating device 33 and the first valve 3111 are all electrically connected to the controller and to the power supply module. During the process of adding water to the distillation chamber 32, when the liquid level sensor 310 detects that the liquid level in the distillation chamber 32 is too high, it sends a signal to the controller. The controller then controls the first valve 3111 to close, blocking the second water inlet 36 to prevent water in the distillation chamber 32 from overflowing into the condenser 34 and contaminating the distilled water. The temperature sensor 3110 monitors the water temperature in the distillation chamber 32 in real time and sends a signal to the controller. During the heating process of the heating device 33 on the distillation chamber 32, when the temperature sensor 3110 detects that the water temperature has risen to 98°C, the controller controls the heating device 33 to reduce its power to maintain a gentle boiling state, avoiding violent boiling that could cause water to splash out of the distillation chamber 32 and enter the condenser 34, contaminating the distilled water. When the liquid level sensor 310 detects that the liquid level in the distillation chamber 32 is too low, it sends a signal to the controller. The controller then controls the heating device 33 to stop working to prevent dry burning. When the liquid level sensor 310 malfunctions and the liquid level is too low, the temperature sensor 3110 detects an abnormal increase in the steam temperature in the distillation chamber 32. The controller then controls the heating device 33 to stop working, improving the reliability of the measuring instrument.

[0029] In this embodiment, the liquid level sensor 310 is a capacitive liquid level sensor, installed on the side wall of the distillation chamber 32. Its detection electrodes are arranged along the height of the distillation chamber 32, divided into low liquid level detection points (20mm from the bottom of the distillation chamber 32), normal liquid level detection points (100mm from the bottom of the distillation chamber 32), and high liquid level detection points (150mm from the bottom of the distillation chamber 32). The measurement accuracy of the liquid level sensor 310 is ±2mm. The temperature sensor 3110 is a PT100 platinum resistance sensor, and also includes a stainless steel probe (4mm in diameter and 30mm in length). The probe is vertically inserted into the distillation chamber 32, and the temperature sensor 3110 is encapsulated inside the probe. The distance between the bottom of the probe and the upper surface of the heating device 33 is 10mm. The measurement range of the temperature sensor 3110 is 0-150℃, and the accuracy is ±0.5℃. A buzzer is installed inside the first housing 11. The buzzer is electrically connected to the controller. When the liquid level in the distillation chamber 32 is too low, the controller controls the buzzer to vibrate and alarm.

[0030] The condensation device 34 includes a fan 342 and several condenser tubes 341. The fan 342 is installed inside a second housing 31, which has ventilation openings. The air outlet of the fan 342 faces the condenser tubes 341. One end of each condenser tube 341 is connected to the distillation chamber 32, and the other end is connected to the temporary storage chamber 35. The fan 342 is electrically connected to a power module and a controller. When distillation begins, the fan 342 is turned on to blow air into the condenser tubes 341. Steam flows from the distillation chamber 32 into the condenser tubes 341. The fan 342 accelerates the airflow on the outer surface of the condenser tubes 341, increasing heat exchange efficiency and rapidly reducing the steam temperature, causing the steam to condense into distilled water. In this embodiment, multiple condenser tubes 341 are provided. The condenser tubes 341 are spiral tubes made of pure copper, with a spiral diameter of 35mm, a pitch of 10mm, a total length of 300mm, an outer diameter of 8mm, and a wall thickness of 1mm. Multiple aluminum heat dissipation fins, 0.8mm thick and spaced 3mm apart, are provided on the outer side of the condenser tubes 341. The fan 342 is a 12V DC miniature fan with dimensions of 40mm×40mm×10mm and an adjustable wind speed range of 1.2-2.5m / s. A bracket is fixed on the inner wall of the second housing 31, and the fan 342 is mounted on the bracket.

[0031] The distillation module 3 also includes a second water supply pipe 39, which is connected to the second water outlet 37. The second water supply pipe 39 is a flexible hose. When distilled water is needed, the second valve 3112 is opened to allow distilled water to flow out through the second water supply pipe 39. The second water supply pipe 39 is a flexible hose, and the water outlet position can be freely adjusted by bending the second water supply pipe 39 for convenient use.

[0032] Example 3 This embodiment is the third embodiment of the portable pH meter with distillation function of the present invention. This embodiment is similar to Embodiment 2, except that, as Figure 3 As shown, the water storage module 2 includes a housing 21 and a filter device 23. A first inlet is located at the top of the housing 21, and a first outlet 211 is located at the bottom of the housing 21. The filter device 23 is fixedly installed on the inner wall of the housing 21, dividing the inner cavity of the housing 21 into a filtration chamber and a water storage chamber. The filtration chamber is connected to the first inlet, and the water storage chamber is connected to the first outlet 211. In use, the cover 22 is opened, and the collected natural water is injected into the housing 21 through the first inlet. After being filtered by the filter device 23, the water enters the distillation module 3 through the first outlet 211 under gravity. The filter device 23 removes some impurities from the water, preventing blockage of the first outlet 211 and the second inlet 36.

[0033] The water storage module 2 also includes a cover 22, which is located on the top of the housing 21 and is used to open or close the first water inlet 212. In use, the cover 22 is opened and the collected natural water source is injected into the housing 21 through the first water inlet 212. After the housing 21 stores enough water, the cover 22 is closed to prevent external dust and debris from entering the water storage module 2, thereby reducing the frequency of clogging of the filter device 23 and reducing the number of cleaning operations.

[0034] The first outer shell 11 has a long, narrow mounting groove on its side wall, and the box body 21 has a buckle on its side wall. The buckle engages with the mounting groove, and a nitrile rubber sealing ring is interference-fitted into the gap between the buckle and the mounting groove to enhance the sealing of the inner cavity of the first outer shell 11. The box body 21 is made of food-grade PP material and has an effective water storage capacity of 500mL. The diameter of the first water inlet at the top of the box body 21 is 20mm. The cover 22 is made of rubber and has external threads on its side wall. The inner wall of the first water inlet has internal threads that mate with the external threads, and the cover 22 is threadedly connected to the first water inlet. The bottom surface of the box body 21 is inclined, and the first water outlet 211 is located at the lowest point of the bottom surface of the box body 21, so that the water in the box body 21 can flow out fully from the first water outlet 211, reducing residue.

[0035] The filtration device 23 includes a filter screen, an activated carbon layer, and a cotton filter element arranged sequentially in the direction away from the first water inlet. The filter screen can intercept large suspended solids such as sand and soil particles in the water source, playing a primary filtration role; the activated carbon layer adsorbs organic matter, odors, and some colored impurities in the water source, performing a second filtration; the cotton filter element can further remove fine suspended solids, colloids, and some bacteria in the water, performing a third filtration; the three filtrations effectively reduce impurities in the water source, preventing clogging, and providing a clean pre-treated water source for the subsequent distillation process, thus improving the quality of the distilled water. In this embodiment, the filter device 23 is fixed to the inside of the housing 21 by a threaded connection; the filter screen is made of 304 stainless steel with a mesh size of 80μm and a wire diameter of 0.1mm, and is manufactured by stamping process with stainless steel edging; the activated carbon layer uses columnar granular activated carbon (particle size 1-2mm) with a filling amount of 5g and an activated carbon specific surface area ≥1000m² / g; the cotton filter element is manufactured by melt-blown process with a pore size accuracy of 5μm; the turbidity of the pretreated water source is ≤5NTU and the suspended solids content is ≤10mg / L.

[0036] The power module includes a first power supply and a second power supply. The first power supply is electrically connected to the main body 1 of the measuring instrument, and the second power supply is electrically connected to the distillation module 3. Isolation converters are provided between the first power supply and the main body 1 of the measuring instrument, and between the second power supply and the distillation module 3. The first power supply and the second power supply supply power to the main body 1 and the distillation module 3 independently, respectively. By setting up isolation converters, electrical isolation between the first power supply and the second power supply can be achieved, avoiding electromagnetic interference and voltage fluctuations caused by the large current generated when the second power supply supplies power to the distillation module 3, which could affect the normal operation of the circuits inside the main body 1 of the measuring instrument, and ensuring the stability of the pH value reading. In this embodiment, the first power supply is electrically connected to the detection circuit, and the heating device 33, the fan 342 and the first valve 3111 are all electrically connected to the second power supply. The first power supply is a 3.7V lithium battery, and the second power supply is a 10000mAh, 12V lithium iron phosphate battery; the isolation converter is an optocoupler; the first power supply and the human-machine interface unit 12 are both electrically connected to the controller.

[0037] The working principle of the portable pH meter with distillation function in this embodiment is as follows: 1. Users select representative soil samples in the field, remove impurities such as stones and plant debris, weigh an appropriate amount of soil sample, and place it in a clean sample container. 2. Collect natural water source, open the cover 22, and inject it into the tank 21 through the first water inlet. After being filtered three times by the filter device 23, it is stored in the tank 21. 3. During testing, the distillation function is selected on the human-machine interaction unit 12. The controller controls the first valve 3111 to open. Water in the water storage module 2 can flow into the distillation chamber 32 through the first water supply pipe 38. When the liquid level in the distillation chamber 32 rises above the high liquid level detection point, the liquid level sensor 310 transmits a signal to the controller. The controller controls the first valve 3111 to close, blocking the second water inlet 36. 4. The controller controls the heating device 33 to heat the distillation chamber 32 with a power of 500W, so that the water evaporates and produces steam. When the temperature sensor 3110 detects that the water temperature has risen to 98°C, the controller controls the heating device 33 to reduce the power to 300W to maintain a gentle boiling state.

[0038] 5. As the water evaporates, the water volume decreases, and the liquid level drops. When the liquid level in the distillation chamber 32 is lower than the low liquid level detection point or the temperature is too high, the liquid level sensor 310 or the temperature sensor 3110 sends a signal to the controller. The controller controls the heating device 33 and the fan 342 to stop working and displays a water shortage prompt and a distillation completion prompt on the display screen 121 of the human-machine interaction unit 12. 6. Steam is injected into condenser 341 through steam outlet. Fan 342 blows air into condenser 341 to accelerate heat dissipation and quickly reduce steam temperature, so that steam is condensed into distilled water and stored in temporary storage chamber 35. 7. Open the second valve 3112 and take out some distilled water from the second outlet 37 to clean the pH electrode. Use filter paper to absorb the residual water on the pH electrode. 8. Connect the pH electrode to the pH electrode interface 132, then take out some distilled water and mix it with the soil sample to be tested to prepare a soil suspension. Use the pH electrode to detect the pH value of the soil suspension. The detection data is transmitted to the detection circuit. The detection circuit transmits the processed pH value data to the human-computer interaction unit 12 and displays it on the display screen 121. When the reading is stable (fluctuation range ≤ 0.02pH), record the detection result and determine the acidity and alkalinity of the soil.

[0039] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A portable pH meter with distillation function, characterized in that, The instrument includes a main body (1), a power module, a water storage module (2), a distillation module (3), and a controller for controlling the distillation module (3). The water storage module (2) and the distillation module (3) are both fixedly connected to the main body (1). The distillation module (3) is electrically connected to the controller. The distillation module (3) and the main body (1) are both electrically connected to the power module. The water storage module (2) is provided with a first water inlet (212) for injecting water and a first water outlet (211) for supplying water to the distillation module (3). The distillation module (3) is provided with a second water inlet (36) and a second water outlet (37) for taking water. The first water outlet (211) is connected to the second water inlet (36). A first valve (3111) is provided between the first water outlet (211) and the second water inlet (36).

2. The portable pH meter with distillation function according to claim 1, characterized in that, The distillation module (3) includes a second outer shell (31), a distillation chamber (32), a heating device (33), a condensing device (34), and a temporary storage chamber (35). The second outer shell (31) is fixedly connected to the main body (1) of the measuring instrument. The distillation chamber (32), the heating device (33), the condensing device (34), and the temporary storage chamber (35) are all installed inside the second outer shell (31). The second water inlet (36) and the second water outlet (37) are located on the second outer shell (31). The device (33) is installed at the bottom of the distillation chamber (32). The bottom of the inner cavity of the distillation chamber (32) is connected to the second water inlet (36). The top of the inner cavity of the distillation chamber (32) is connected to the condenser (34). The condenser (34) is connected to the temporary storage chamber (35). The temporary storage chamber (35) is connected to the second water outlet (37). The second water outlet (37) is provided with a second valve (3112). The heating device (33) is electrically connected to the power module and the controller.

3. The portable pH meter with distillation function according to claim 2, characterized in that, A heat insulation plate is provided between the second outer shell (31) and the main body (1) of the measuring instrument.

4. The portable pH meter with distillation function according to claim 2, characterized in that, The distillation module (3) further includes a liquid level sensor (310) and a temperature sensor (3110). The liquid level sensor (310) and the temperature sensor (3110) are both located in the distillation chamber (32). The first valve (3111) is a solenoid valve. The liquid level sensor (310), the temperature sensor (3110), the heating device (33), and the first valve (3111) are all electrically connected to the controller and to the power supply module.

5. The portable pH meter with distillation function according to claim 2, characterized in that, The condensation device (34) includes a fan (342) and several condenser tubes (341). The fan (342) is installed inside the second housing (31). The second housing (31) is provided with a vent. The air outlet of the fan (342) faces the condenser tubes (341). One end of the condenser tubes (341) is connected to the distillation chamber (32), and the other end is connected to the temporary storage chamber (35). The fan (342) is electrically connected to the power module and the controller.

6. The portable pH meter with distillation function according to claim 4, characterized in that, The distillation module (3) also includes a second water supply pipe (39), which is connected to the second water outlet (37). The second water supply pipe (39) is a flexible hose.

7. The portable pH meter with distillation function according to any one of claims 1 to 6, characterized in that, The water storage module (2) includes a housing (21) and a filter device (23). The first water inlet (212) is located at the top of the housing (21), and the first water outlet (211) is located at the bottom of the housing (21). The filter device (23) is fixedly installed on the inner wall of the housing (21). The filter device (23) divides the inner cavity of the housing (21) into a filter cavity and a water storage cavity. The filter cavity is connected to the first water inlet (212), and the water storage cavity is connected to the first water outlet (211).

8. The portable pH meter with distillation function according to claim 7, characterized in that, The water storage module (2) also includes a cover (22), which is located on the top of the box (21) and is used to open or close the first water inlet (212).

9. The portable pH meter with distillation function according to claim 7, characterized in that, The filtration device (23) includes a filter screen, an activated carbon layer and a cotton filter element arranged sequentially in a direction away from the first water inlet (212).

10. The portable pH meter with distillation function according to claim 1, characterized in that, The power module includes a first power supply and a second power supply. The first power supply is electrically connected to the main body (1) of the measuring instrument, and the second power supply is electrically connected to the distillation module (3). Isolation converters are provided between the first power supply and the main body (1) of the measuring instrument, and between the second power supply and the distillation module (3).

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