Portable handheld pH tester

Abstract

The utility model relates to a portable handheld pH tester which comprises a testing shell, a power supply assembly is installed in the testing shell, and a display assembly used for displaying numerical values, a key assembly used for triggering functions and a probe assembly used for testing pH values are installed on the outer wall of the testing shell. A battery cover detachably connected with the test shell is arranged at the top end of the power supply assembly; the power supply assembly comprises a power supply battery, a battery pole piece, a battery bin, a battery spring and a circuit board fixing seat, a mounting hole for accommodating the power supply battery is formed in the top end of the circuit board fixing seat, and the battery bin is mounted at the bottom end of the circuit board fixing seat; the power supply battery is embedded into the battery compartment from two mounting holes in the circuit board fixing seat; the battery pole piece is arranged at the top end of the power supply battery and sleeved with the battery cover; and the battery spring is arranged at the bottom of the battery bin.

Description

Technical Field

[0001] This utility model relates to the technical field of pH testers, and mainly to a portable handheld pH tester. Background Technology

[0002] A pH meter is an instrument used to measure the acidity or alkalinity of a solution. It determines the pH value by measuring the activity of hydrogen ions (H+) in the solution. The pH value is a number between 0 and 14, where 7 represents neutral, below 7 represents acidic, and above 7 represents alkaline. pH meters have a wide range of applications, including but not limited to: environmental monitoring, agriculture, industrial production, scientific research experiments, water treatment, and household use.

[0003] Many portable handheld pH testers on the market use LR44 button batteries for power. These batteries have low power consumption and short battery life. Furthermore, if young children open the battery cover without tools and accidentally swallow the batteries, it can be dangerous. Some portable handheld pH testers use a single-threaded connection between the battery cover, connecting sleeve, and test housing. While this method is reliable, it involves complex mold manufacturing and high processing costs. Additionally, removing the battery cover to replace the battery or the connecting sleeve to replace the probe assembly is time-consuming and inconvenient. Finally, some portable handheld pH testers lack a carrying strap mounting hole, making them less portable. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a portable handheld pH tester.

[0005] The technical solution of this utility model is as follows: A portable handheld pH tester includes a test housing, a power supply component installed inside the test housing, a display component for displaying pH values ​​and a button component for triggering set instrument functions installed on the outer wall of the test housing, a probe component for testing pH values ​​installed at the bottom of the test housing, and a battery cover that is detachably connected to the test housing is provided at the top of the power supply component.

[0006] The power supply assembly includes a power supply battery, battery electrodes, a battery compartment, a battery spring, and a circuit board mounting base. The top of the circuit board mounting base has a mounting hole for accommodating the power supply battery. The battery compartment is mounted at the bottom of the circuit board mounting base, and the power supply battery is inserted into the battery compartment through two mounting holes on the circuit board mounting base.

[0007] The battery electrode is attached to the top of the power supply battery and sleeved inside the battery cover;

[0008] The battery spring is located at the bottom of the battery compartment.

[0009] The inner circular surface of the battery cover is provided with three hooks, and the outer circular surface of the circuit board mounting base is provided with three L-shaped grooves corresponding to each hook. The L-shaped grooves include vertically arranged straight grooves and horizontally arranged quick-release grooves, and the straight grooves and quick-release grooves are vertically connected.

[0010] The three hooks are slidably engaged in each L-shaped groove in a corresponding manner. The end of the quick-release rotary groove away from the straight groove is provided with a locking rib for detachably engaging the hook.

[0011] In a preferred embodiment of the present invention, the display component includes a liquid crystal frame, a liquid crystal display, conductive rubber, and a backlight. The liquid crystal display is fixedly sleeved and installed inside the liquid crystal frame, and the liquid crystal frame is fixedly installed on the surface of the test housing. The back of the liquid crystal display is electrically connected to the conductive rubber and the backlight.

[0012] In a preferred embodiment of the present invention, a circuit board assembly is fixed at the bottom of the circuit board mounting base. The circuit board assembly is electrically connected to the display assembly, the battery compartment and the probe assembly respectively, and the circuit board mounting base is fixedly connected to the inner wall of the test housing.

[0013] In a preferred embodiment of this utility model, a connecting sleeve is detachably connected to the bottom of the test housing, and the probe assembly is disposed through the connecting sleeve;

[0014] In a preferred embodiment of this utility model, two buckles are provided on the inner circular surface of the connecting sleeve, and the bottom of the test housing is provided with slots corresponding to the two buckles one by one. The slots include vertically arranged straight slots and horizontally arranged quick-release rotary slots, and the straight slots and quick-release rotary slots are vertically connected. The two buckles are slidably engaged in each slot one by one, and the end of the quick-release rotary slot away from the straight slot is provided with a buckle rib for detachably engaging the buckle.

[0015] In a preferred embodiment of this utility model, an annular support rib is provided on the inner circular surface of the lower end of the connecting sleeve.

[0016] In a preferred embodiment of this utility model, the probe assembly includes a probe, a probe cover, a temperature probe, a glass tube electrode, a first O-ring, a plug, a second O-ring, a small plate assembly, and a reference electrode, wherein the diameter of the second O-ring is larger than that of the first O-ring; the temperature probe includes a stainless steel tube and a thermistor connected to each other; the upper end of the probe is connected to the inner wall of the test housing; the small plate assembly fixes the glass tube electrode, the temperature probe, and the reference electrode; and the probe assembly is covered with a protective sleeve.

[0017] In a preferred embodiment of this utility model, the test housing is a tubular structure.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This utility model is a portable handheld pH tester, which is powered by two AAA batteries, has a long battery life, and because of its large size, it will not cause personal danger to young children by accidentally swallowing it, thus improving the safety of the instrument.

[0020] 2. This utility model is a portable handheld pH tester. It adopts a quick-release screw groove assembly for the battery cover and connecting sleeve, and is equipped with anti-misinstallation measures, making disassembly and replacement quick and efficient. It also has a carrying rope mounting hole to meet the needs of some users who need to carry the pH tester with a carrying rope, thus improving the portability of the instrument. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a portable handheld pH meter.

[0022] Figure 2 A schematic diagram of the quick-release swivel groove structure for testing the housing;

[0023] Figure 3 For connecting the sleeve;

[0024] Figure 4 This is a cross-sectional view showing the fit between the connecting sleeve and the test housing;

[0025] Figure 5 A schematic diagram of the quick-release swivel groove structure for the circuit board mounting bracket;

[0026] Figure 6 A schematic diagram of the battery cover's hook and carrying strap hole structure;

[0027] Figure 7 A cross-sectional view showing the fit between the battery cover and the circuit board mounting bracket;

[0028] Figure 8 This is a schematic diagram of the battery compartment structure;

[0029] Figure 9 This is an example of a portable handheld pH meter.

[0030] The reference numerals in the attached figures are as follows:

[0031] 1. Protective sleeve; 2. Sponge pad; 3. Connecting sleeve; 301. Hook; 302. Annular support rib; 4. First O-ring; 5. Plug; 6. Glass tube electrode; 7. Probe; 8. Probe cover; 9. Stainless steel tube; 10. Thermistor; 11. Second O-ring; 12. Small board assembly; 13. Buttons; 1301. Power / backlight button; 1302. CAL button; 1303. HOLD / TEMP button; 14. Function board; 15. Lens; 16. Test housing; 1601. Straight groove; 16 02. Quick-release screw groove; 1603. Clamping rib; 17. Circuit board assembly; 18. LCD frame; 19. LCD display; 20. Conductive rubber; 21. Backlight; 22. Circuit board mounting bracket; 2201. Straight slot; 2202. Quick-release screw groove; 2203. Clamping rib; 23. Third O-ring; 24. Self-tapping screw; 25. AAA battery; 26. Countersunk self-tapping screw; 27. Battery electrode; 28. Battery cover; 2801. Hook; 29. ​​Battery compartment; 30. Battery spring; 31. Reference electrode. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1:

[0034] Please see Figure 1-8 The present invention provides the following technical solution: a portable handheld pH tester, including a test housing 16, a power supply component installed inside the test housing 16, a display component for displaying values ​​and a button component for triggering set instrument functions installed on the outer wall of the test housing 16, a probe component for testing pH values ​​installed at the bottom of the test housing 16, and a battery cover 28 detachably connected to the test housing 16 at the top of the power supply component;

[0035] The power supply assembly includes two AAA batteries 25, battery terminals 27, a battery compartment 29, a battery spring 30, and a circuit board mounting base 22. The top of the circuit board mounting base 22 has mounting holes for accommodating the AAA batteries 25. The back of the battery compartment 29 has four circular positioning pins that engage with positioning holes on the circuit board assembly 17. It is connected to the back of the circuit board assembly 17 using self-tapping screws 24. The battery compartment 29 is mounted at the bottom of the circuit board mounting base 22, and the power supply batteries 25 are inserted into the battery compartment 29 through two mounting holes on the circuit board mounting base 22.

[0036] The battery electrode 27 is attached to the top of the power supply battery 25 and is sleeved inside the battery cover 28; the external dimensions of the battery electrode 27 need to match the battery cover 28.

[0037] The battery spring 30 is located at the bottom of the battery compartment 29; the external dimensions of the battery spring 30 need to match those of the battery compartment 29.

[0038] The power supply component is provided with a battery cover 28 at the top, and the battery cover 28 is detachably and rotatably engaged with the top of the test housing 16; the inner circular surface of the battery cover 28 is provided with three hooks 2801, and the outer circular surface of the circuit board fixing seat 22 is provided with three L-shaped grooves corresponding to each hook 2081; the L-shaped groove 2201 includes a vertically arranged straight groove 2201 and a horizontally arranged quick-release rotating groove 2202, and the straight groove 2201 and the quick-release rotating groove 2202 are vertically connected;

[0039] The three hooks 2801 are slidably engaged in each L-shaped groove in a one-to-one correspondence. The end of the quick-release groove 2202 away from the straight groove 2201 is provided with a clamping rib 2203 for detachably engaging the hooks 2801. When the battery cover 28 is rotated clockwise, the hooks 2801 slide on the quick-release groove 2202 of the circuit board mounting base 22. When the hooks 2801 pass the clamping rib 2203 on the quick-release groove 2202, the battery cover is tightly installed on the top of the test housing 16.

[0040] The battery cover 28 is also provided with locking and unlocking indicators, a triangular indicator, and a lanyard mounting hole; the locking and unlocking indicators and the triangular indicator are used to indicate to the user to open or close the battery cover correctly; the lanyard mounting hole is used to install a lanyard to improve the portability of the instrument.

[0041] The display component includes a liquid crystal frame 18, a liquid crystal display 19, conductive rubber 20, and a backlight 21, and is fixed on the circuit board assembly 17. The display component is fitted into a rectangular window on the test housing 16, and a lens 15 fitted into the rectangular window is also provided at the front end of the display component. The liquid crystal display 19 is fixedly sleeved and installed in the liquid crystal frame 18, and the liquid crystal frame 18 is fixedly installed on the surface of the test housing 16. The back of the liquid crystal display 19 is electrically connected to the conductive rubber 20 and the backlight 21. The backlight 21 has PCB pins and is electrically connected to the circuit board assembly 17. It uses a dual-color backlight of white and red. The red backlight is set to light up only when the pH of the test solution is <3.5 or >12.5. When 3.5≤pH≤12.5, the backlight is turned on to white when the backlight button is pressed.

[0042] The circuit board mounting base 22 is fixed to the bottom of the circuit board assembly 17. The circuit board assembly 17 is electrically connected to the display assembly, the battery compartment and the probe assembly respectively. The circuit board mounting base 22 is fixedly connected to the inner wall of the test housing 16.

[0043] The bottom of the test housing 16 is detachably connected to a connecting sleeve 3, and the probe assembly is disposed through the connecting sleeve 3;

[0044] The inner circular surface of the connecting sleeve 3 is provided with two buckles 301, and the bottom of the test housing 16 is provided with a slot corresponding to the two buckles 301. The slot includes a vertically arranged straight slot 1601 and a horizontally arranged quick-release rotary slot 1602, and the straight slot 1601 and the quick-release rotary slot 1602 are vertically connected. The two buckles 301 are slidably locked in each slot, and the end of the quick-release rotary slot 1602 away from the straight slot 1601 is provided with a buckle rib 1603 for detachably locking the buckle 301.

[0045] The outer wall of the test housing 16 is equipped with a button assembly, which is divided into three buttons from top to bottom: a power / backlight button 1301, a CAL button 1302, and a HOLD / TEMP button 1303. The power / backlight button 1301 is used to turn the tester on or off, and a long press turns the backlight of the LCD screen on or off. The CAL button 1302 is used to calibrate the instrument. The HOLD / TEMP button 1303 locks the current reading after a short press and unlocks it after another short press. A function board 14 is attached to the buttons 13 and the lens 15 for sealing, preventing solution from entering the test housing 16 and damaging the tester. The function board 14 has the button functions, product name, and model number printed on its outer surface. The user can observe the text and symbols displayed on the LCD screen 19 through the transparent window of the function board 14 and the lens 15 corresponding to the LCD display area.

[0046] The inner circular surface of the lower end of the connecting sleeve 3 is provided with an annular support rib 302; the connecting sleeve 3 extends upward from the lower end of the probe assembly, and when the lower edge of the annular support rib at the upper end of the probe assembly contacts the upper edge of the annular support rib on the inner circular surface of the lower end of the connecting sleeve 3, the connecting sleeve 3 is rotated clockwise, and the buckle on the inner circular surface of the connecting sleeve 3 slides on the quick-release screw groove on the bottom outer circular surface of the test housing 16. When the buckle on the inner circular surface of the connecting sleeve 3 passes the buckle rib 1603 of the quick-release screw groove 1602 on the bottom outer circular surface of the test housing 16, the probe assembly is tightly fixed to the bottom of the test housing 16.

[0047] The probe assembly includes a probe 7, a probe cover 8, a temperature probe, a glass tube electrode 6, a first O-ring 4, a plug 5, a second O-ring 11, a small plate assembly 12, and a reference electrode 31. The diameter of the second O-ring is larger than that of the first O-ring. The temperature probe includes a stainless steel tube 9 and a thermistor 10 connected to each other. The small plate assembly 12 is fixed with the glass tube electrode 6, the temperature probe, and the reference electrode 31. The probe assembly is connected to the pin header on the circuit board assembly 17, which transmits the electrical signals of temperature and solution pH collected by the probe assembly to the microcontroller on the circuit board assembly 17 for processing and display on the liquid crystal display 19.

[0048] The probe 7 is equipped with a probe cover 8 on its upper part, which is used to seal the cavity containing the reference liquid. The probe cover 8 has a small through hole through which the reference electrode 31 passes and is immersed in the reference liquid. The probe cover 8 is sealed and secured with silicone sealant and epoxy resin AB glue. The upper end of the probe is connected to the inner wall of the test housing. The middle part of the probe 7 has a cavity for filling the reference liquid. The probe 7 contains a glass tube electrode 6, a stainless steel tube 9 and a plug 5. The stainless steel tube 9 contains a thermistor 10 for detecting the solution temperature or ambient temperature.

[0049] In this embodiment, to facilitate the protection of the probe assembly, a protective sleeve 1 is also provided, which contains a sponge pad 2. The sponge pad 2 is soaked in a protective liquid. The sponge pad 2 is adjacent to the ball head of the glass tube electrode 6. The protective liquid soaked in the sponge pad 2 keeps the ball head of the glass tube electrode 6 moist for a long time, maintains the stability of the instrument performance, and prevents it from being damaged by impact. The protective sleeve 1 and the sponge pad 2 can be nested together with the probe assembly and sold separately as accessories.

[0050] The test housing 16 in this embodiment has teardrop-shaped decorative features on both sides, which correspond to the purpose of the tester, provide a good grip, and prevent slipping.

[0051] Working principle:

[0052] When starting to use the tester, you need to press the power / backlight button 1301 briefly to turn it on. When it is on, press and hold the power / backlight button for 2 to 3 seconds to turn it off. In normal measurement mode, a short press will turn on the backlight so that the user can easily see the text and symbols displayed on the LCD 19. Press it again to turn off the backlight.

[0053] Before testing, the portable handheld pH meter in this embodiment must be calibrated. Briefly press the power / backlight button 1301 to turn on the portable handheld pH meter and enter measurement mode. The calibration steps are as follows:

[0054] 1. In normal measurement mode, press and hold the CAL key 1302 for 2 to 3 seconds to enter calibration mode; the LCD display 19 will first show "4.00" (adjustable between 3.50 and 4.50) and flashing "CAL1"; after cleaning the probe, place it in a solution with the corresponding pH value. After the tester determines that the calibration is successful, it will display "PAS" to indicate that the CAL1 calibration is successful and automatically jump to the next calibration point. The screen will then display "6.86" ​​(adjustable between 6.36 and 7.36) and flashing "CAL2".

[0055] 2. After quickly cleaning the probe, place it in a solution with the corresponding pH value. Once the tester determines that the calibration is successful, it will display "PAS" to indicate that the CAL2 calibration is successful and automatically jump to the next calibration point CAL3. The LCD display 19 will show "9.18" (which can be adjusted from 8.68 to 9.68) and a flashing "CAL3".

[0056] 3. After quickly cleaning the probe, place it in a solution with the corresponding pH value. Once the tester determines that the calibration is successful, it will display "PAS" indicating that the CAL3 calibration is successful and automatically switch to the normal measurement mode.

[0057] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0058] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A portable handheld pH meter, characterized in that, The device includes a test housing (16), inside which a power supply assembly is installed. On the outer wall of the test housing (16) are a display assembly for displaying pH values ​​and a button assembly for triggering set instrument functions. At the bottom of the test housing (16) is a probe assembly for testing pH values, and at the top of the power supply assembly is a battery cover (28) that is detachably connected to the test housing (16). The power supply assembly includes a power supply battery (25), battery electrode (27), battery compartment (29), battery spring (30), and circuit board mounting base (22). The top of the circuit board mounting base (22) is provided with mounting holes for accommodating the power supply battery (25). The battery compartment (29) is mounted on the bottom of the circuit board mounting base (22). The power supply battery (25) is inserted into the battery compartment (29) through two mounting holes on the circuit board mounting base (22). The battery electrode (27) is attached to the top of the power supply battery (25) and sleeved inside the battery cover (28); The battery spring (30) is located at the bottom of the battery compartment (29); The inner circular surface of the battery cover (28) is provided with three hooks (2801), and the outer circular surface of the circuit board fixing seat (22) is provided with three L-shaped grooves corresponding to each hook (2801). The L-shaped groove (2201) includes a vertically arranged straight groove (2201) and a horizontally arranged quick-release rotating groove (2202), and the straight groove (2201) and the quick-release rotating groove (2202) are vertically connected. The three hooks (2801) are slidably engaged in each L-shaped groove in a corresponding manner. The end of the quick-release groove (2202) away from the straight groove (2201) is provided with a locking rib (2203) for detachably engaging the hooks (2801).

2. A portable handheld pH meter according to claim 1, characterized in that, The display assembly includes a liquid crystal frame (18), a liquid crystal display (19), a conductive rubber (20), and a backlight (21). The liquid crystal display (19) is fixedly fitted inside the liquid crystal frame (18), and the liquid crystal frame (18) is fixedly installed on the surface of the test housing (16). The back of the liquid crystal display (19) is electrically connected to the conductive rubber (20) and the backlight (21).

3. A portable handheld pH meter according to claim 1, characterized in that, The circuit board mounting base (22) has a circuit board assembly (17) fixed at its bottom end. The circuit board assembly (17) is electrically connected to the display assembly, the battery compartment and the probe assembly respectively. The circuit board mounting base (22) is fixedly connected to the inner wall of the test housing (16).

4. A portable handheld pH meter according to claim 1, characterized in that, The bottom of the test housing (16) is detachably connected to a connecting sleeve (3), and the probe assembly is disposed through the connecting sleeve (3); The inner circular surface of the connecting sleeve (3) is provided with two buckles (301), and the bottom of the test housing (16) is provided with a slot corresponding to the two buckles (301). The slot includes a vertically arranged straight slot (1601) and a horizontally arranged quick-release rotating slot (1602), and the straight slot (1601) and the quick-release rotating slot (1602) are vertically connected. The two buckles (301) are slidably locked in each slot, and the end of the quick-release rotating slot (1602) away from the straight slot (1601) is provided with a buckle rib (1603) for detachably locking the buckle (301).

5. A portable handheld pH meter according to claim 4, characterized in that, The inner circular surface of the bottom end of the connecting sleeve (3) is provided with an annular support rib (302).

6. A portable handheld pH meter according to claim 1, characterized in that, The probe assembly includes a probe (7), a probe cover (8), a temperature probe, a glass tube electrode (6), a first O-ring (4), a plug (5), a second O-ring (11), a small plate assembly (12), and a reference electrode (31). The diameter of the second O-ring (11) is larger than that of the first O-ring (4). The temperature probe includes a stainless steel tube (9) and a thermistor (10) connected to each other. The upper end of the probe (7) is connected to the inner wall of the test housing (16). The small plate assembly (12) is fixed with the glass tube electrode (6), the temperature probe, and the reference electrode (31). The probe assembly is wrapped with a protective sleeve (1).

7. A portable handheld pH meter according to claim 1, characterized in that, The test housing (16) is a tubular structure.

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