CN219369642U - PH probe and water quality monitoring equipment - Google Patents

Abstract

The utility model discloses a PH probe and water quality monitoring equipment, which comprises a main cylinder and a detection mechanism. The main cylinder comprises a first cylinder body and a second cylinder body, the second cylinder body is arranged on the lower side of the first cylinder body, the second cylinder body is used for being detachably connected with a mounting hole of a mounting disc of water quality monitoring equipment, and the outer diameter of the first cylinder body is suitable for extending into the upper side of the mounting hole from the lower side of the mounting hole; the detection mechanism comprises a PH electrode, the upper end of the PH electrode stretches into the first cylinder, the lower end of the PH electrode stretches out of the main cylinder, the PH electrode is fixed relative to the first cylinder, and the PH electrode is used for detecting the concentration of hydrogen ions in the detected liquid. According to the utility model, the second cylinder body can be detachably connected with the mounting hole of the mounting plate in the water quality monitoring equipment, the outer diameter of the first cylinder body is suitable for extending into the upper side of the mounting hole from the lower side of the mounting hole, the PH probe can be mounted and dismounted by operating from the lower side of the mounting plate, the maintenance and replacement of the PH probe are convenient, and the detection mechanism can realize water quality monitoring.

Description

PH probe and water quality monitoring equipment

Technical Field

The utility model relates to the technical field of water quality monitoring, in particular to a PH probe and water quality monitoring equipment.

Background

The quality of the drinking water is closely related to health. The water quality monitoring work is an important means for pollution early warning, continuous pollutant monitoring and treatment effect assessment. The water quality monitoring is a process of monitoring and measuring the types of pollutants, the concentration and the change trend of various pollutants in a water body, and evaluating the water quality condition, the monitoring range is quite wide, and the monitoring range comprises uncontaminated and polluted natural water (river, lake, sea and underground water) and various industrial drainage and the like, and the main monitoring items can be divided into two main categories, wherein one category is comprehensive indexes reflecting the water quality condition, such as temperature, chromaticity, turbidity, pH value conductivity, suspended matters, dissolved oxygen, chemical oxygen demand, biochemical oxygen demand and the like, and the other category is toxic matters, such as phenol, cyanogen, arsenic, lead, chromium, cadmium, mercury, organic pesticides and the like.

Based on the monitoring of the conductivity of the PH value, a PH probe is needed to be conveniently applied to water quality monitoring equipment, and to be convenient to install and detach.

Disclosure of Invention

An object of the present application is to provide a PH probe and a water quality monitoring apparatus, so as to solve the problems set forth in the above-mentioned background art.

In order to achieve the above purpose, the present application provides the following technical solutions:

the PH probe of the utility model comprises:

the water quality monitoring device comprises a main barrel, a first water quality monitoring device and a second water quality monitoring device, wherein the main barrel comprises a first barrel and a second barrel, the second barrel is arranged on the lower side of the first barrel, the second barrel is used for being detachably connected with a mounting hole of a mounting disc of the water quality monitoring device, and the outer diameter of the first barrel is suitable for extending into the upper side of the mounting hole from the lower side of the mounting hole;

the detection mechanism comprises a PH electrode, the upper end of the PH electrode stretches into the first cylinder, the lower end of the PH electrode stretches out of the main cylinder, the PH electrode is fixed relative to the first cylinder, and the PH electrode is used for detecting the concentration of hydrogen ions in the detected liquid.

Further, the main cylinder further comprises a third cylinder body, the third cylinder body is arranged on one side, far away from the first cylinder body, of the second cylinder body, and the upper side end face of the third cylinder body is suitable for being attached to the lower side end face of the mounting plate at the mounting hole and used for limiting the length of the main cylinder extending from the upper side of the mounting hole.

Further, a first sealing ring mounting groove is formed in the outer side face, close to the third cylinder, of the second cylinder.

Further, the main cylinder further comprises a fourth cylinder body, the fourth cylinder body is arranged on one side, away from the second cylinder body, of the third cylinder body, the lower end of the PH electrode extends out of the fourth cylinder body, the fourth cylinder body is detachably connected with the protective cap, and the protective cap is sleeved outside the lower end of the PH electrode.

Further, the main cylinder further comprises a fifth cylinder body, the fifth cylinder body is arranged on one side, far away from the second cylinder body, of the first cylinder body, and the outer diameter of the fifth cylinder body is equal to or smaller than the outer diameter of the first cylinder body; the detection mechanism further comprises a PH main control board and an audio male head, the PH main control board is arranged in the fifth cylinder, the PH main control board is electrically connected with the PH electrode, the audio male head extends out of one end, far away from the first cylinder, of the fifth cylinder, and the PH main control board is electrically connected with the audio male head.

Further, the first cylinder, the second cylinder, the third cylinder and the fourth cylinder are integrally connected, and the first cylinder is detachably connected with the fifth cylinder.

Further, the second cylinder, the third cylinder and the fourth cylinder are integrally connected, and the first cylinder is detachably connected with the second cylinder and the fifth cylinder respectively; a second sealing ring is arranged between the inner side end surface of the second cylinder and the lower side end surface of the first cylinder, and/or a third sealing ring is arranged between the inner side surface of the fourth cylinder and the outer side surface of the PH electrode.

The water quality monitoring equipment comprises a mounting plate and the PH probe, wherein the second cylinder body on the PH probe is detachably connected with the mounting hole on the mounting plate.

Further, the water quality monitoring equipment further comprises a probe cylinder, the probe cylinder is arranged on the upper side of the mounting plate, the lower end of the probe cylinder is in sealing and detachable connection with the mounting hole, and an audio female seat is arranged inside the upper end of the probe cylinder.

Further, the water quality monitoring equipment further comprises four-electrode conductivity probes, and the mounting plate is further provided with a mounting opening for mounting the four-electrode conductivity probes.

In summary, the technical effects and advantages of the present utility model at least include:

1. according to the utility model, the second cylinder body can be detachably connected with the mounting hole of the mounting plate in the water quality monitoring equipment, the outer diameter of the first cylinder body is suitable for extending into the upper side of the mounting hole from the lower side of the mounting hole, the PH probe can be mounted and dismounted by operating from the lower side of the mounting plate, the maintenance and replacement of the PH probe are convenient, and the detection mechanism can realize water quality monitoring;

2. in the utility model, one side of the second cylinder, which is far away from the first cylinder, is provided with a third cylinder, the outer diameter of the third cylinder is larger than that of the second cylinder, the end surface of the third cylinder, which is close to the second cylinder, is used for positioning the connection between the second cylinder and the mounting disc, and the outer side surface of the second cylinder, which is close to the third cylinder, is provided with a sealing ring, so that the sealing connection between the second cylinder and the mounting disc is facilitated, and the sealing performance of the upper side of the mounting disc is facilitated to be ensured;

3. in the utility model, the side of the third cylinder far away from the second cylinder is provided with the fourth cylinder, the fourth cylinder is detachably connected with the protective cap, and the protective cap is filled with protective liquid, so that the lower end of the PH electrode can be effectively protected, and the service life of the detection mechanism is prolonged;

4. in the utility model, the second cylinder, the third cylinder and the fourth cylinder are integrally connected, the first cylinder is detachably connected with the second cylinder and the fifth cylinder respectively, and the first cylinder, the second cylinder and the fifth cylinder are arranged as split structures, which is beneficial to the disassembly and assembly of the probe mechanism in the main cylinder;

5. according to the utility model, the upper side of the mounting plate is detachably connected with the probe cylinder, the inner part of the upper end of the probe cylinder is provided with the audio female seat, and when the probe is mounted, the audio male head of the detection mechanism is connected with the audio female head, so that the communication with the control main board of the water quality monitoring equipment can be realized, and the detection data can be sent to the water quality monitoring equipment; the lower extreme and the mounting hole of probe section of thick bamboo are sealed and can dismantle the connection, even if PH probe is dismantled, the liquid of being surveyed also can not get into placing cavities such as circuit board from the mounting hole, avoids producing the influence to the circuit board of upside.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the assembly of a pH probe and a mounting plate in the prior art;

FIG. 2 is a schematic diagram showing the assembly of a PH probe and a mounting plate in the prior art;

FIG. 3 is a schematic view of a pH probe according to a first embodiment of the present utility model;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a schematic diagram showing the assembly of a PH probe and a mounting plate according to a first embodiment of the utility model;

FIG. 6 is a second schematic view of the assembly of a PH probe and a mounting plate according to the first embodiment of the utility model;

FIG. 7 is a schematic diagram of a pH probe in accordance with a second embodiment of the present utility model;

FIG. 8 is a half-sectional view of a pH probe according to a second embodiment of the present utility model;

FIG. 9 is a schematic diagram showing the assembly of a PH probe and a mounting plate according to a second embodiment of the utility model;

FIG. 10 is a second schematic view of the assembly of a PH probe and a mounting plate according to the second embodiment of the utility model.

In the figure: 10. a PH probe; 20. a mounting plate; 30. a probe cylinder; 1. a main barrel; 3. a PH main control board; 4. a PH electrode; 5. an audio male; 6. an electrical connector; 7. a first housing; 8. a second housing; 9. a third housing; 11. a first cylinder; 12. a second cylinder; 13. a third cylinder; 14. a fourth cylinder; 15. a protective cap; 16. a fifth cylinder; 17. a mounting base; 21. a first seal ring; 22. a second seal ring; 23. a third seal ring; 24. a fourth seal ring; 25. a fifth seal ring; 26. a sixth seal ring; 301. an audio master seat; 71. and a limit protrusion.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The assembly structure of the PH probe and the mounting plate in the prior art is shown in fig. 1 and 2, the upper side of the mounting plate 20 is a placing cavity such as a circuit board, the water quality monitoring equipment on the upper side of the mounting plate 20 is of a watertight structure, the lower side of the mounting plate 20 is a testing cavity, and the testing cavity can flow liquid to be tested. The outer shell of the PH probe 10 is composed of a first shell 7, a second shell 8 and a third shell 9; when the PH probe 10 is mounted on the mounting plate 20, the first shell 7 is in threaded connection with the mounting hole on the mounting plate 20 from the upper side of the mounting plate 20, and then the second shell 8 is in threaded connection with the mounting hole; the part of the first shell 7, which is close to the upper side of the mounting hole, is provided with a limiting protrusion 71, the limiting protrusion 71 is larger than the diameter of the mounting hole, and the limiting protrusion 71 is arranged so as to be in sealing connection with the mounting hole, but the PH probe with the structure cannot be disassembled and assembled from the lower side of the mounting plate; the conventional structure is inconvenient to replace the PH probe 10 because the upper side of the mounting plate 20 is a watertight placement chamber for components such as a circuit board, and cannot be detached and mounted from the lower side of the mounting plate 20, which is the detection end.

Example 1

In order to solve the problems in the prior art. This embodiment provides a PH probe 10, as shown in FIGS. 3-6, comprising a main cylinder 1 and a detection mechanism. The main cartridge 1 is used on the one hand for the mounting of the detection mechanism and on the other hand for the mounting with the mounting plate 20. The main cylinder 1 comprises a first cylinder body 11 and a second cylinder body 12, wherein the second cylinder body 12 is arranged on the lower side of the first cylinder body 11, the second cylinder body 12 is used for being detachably connected with a mounting hole of a mounting disc 20 of water quality monitoring equipment, and the outer diameter of the first cylinder body 11 is suitable for extending into the upper side of the mounting hole from the lower side of the mounting hole; the detection mechanism comprises a PH electrode 4, the upper end of the PH electrode 4 stretches into the first cylinder 11, the lower end of the PH electrode 4 stretches out of the main cylinder 1, the PH electrode 4 is fixed relative to the first cylinder 11, and the PH electrode 4 is used for detecting the concentration of hydrogen ions in the detected liquid. Wherein the difference from the prior art arrangement of the first housing 7 and the second housing 8 is that the second cylinder 12 is integrally or detachably connected to the underside of the first cylinder 11.

In this embodiment, the second barrel 12 can be detachably connected with the mounting hole of the mounting plate 20 in the water quality monitoring device, the outer diameter of the first barrel 11 is suitable for extending into the upper side of the mounting hole from the lower side of the mounting hole, the installation and the disassembly of the PH probe 10 can be realized by operating from the lower side of the mounting plate 20, the maintenance and the replacement of the PH probe 10 are convenient, and the detection mechanism can realize the water quality monitoring. The second cylinder 12 is in this embodiment screwed to the mounting hole. In addition, the second cylinder 12 and the mounting hole can be clamped.

In the prior art, the working principle of the PH probe is that a primary cell is formed by a hydrogen ion glass electrode and a reference electrode, and the PH value of the measured liquid is measured by measuring the potential difference between the electrodes to detect the concentration of hydrogen ions in the solution in the process of ion exchange of hydrogen ions in the glass film and the measured liquid.

In the prior art, the PH electrode 4 is generally a tripolar composite electrode, and is composed of a glass electrode, a reference electrode and a temperature electrode. The glass electrode consists of a glass support rod, a glass film, an inner reference solution, an inner reference electrode, an electrode cap, an electric wire and the like. The reference electrode has a known and constant electrode potential, commonly a calomel electrode or a silver/silver chloride electrode. Because the PH value is related to the temperature, a temperature electrode is generally added to carry out temperature compensation, so that a tripolar composite electrode is formed.

The main construction of the pH electrode is an internal reference electrode, an external reference electrode (glass electrode).

An internal reference electrode: an electrode having a known and constant electrode potential that is unresponsive to the activity of hydrogen ions in solution is referred to as a reference electrode. The reference electrode comprises a mercurous sulfate electrode, a calomel electrode, a silver/silver chloride electrode and the like. Most commonly used are calomel electrodes and silver/silver chloride electrodes. The reference electrode has the function of providing and maintaining a fixed reference potential in the measurement cell, so that the reference electrode is required to have a stable, reproducible potential, a small temperature coefficient, and a small polarizing potential when current is passed.

The internal reference electrode is typically immersed in an internal reference solution, which is a mixed solution of neutral phosphate and potassium chloride, typically at 0 potential, pH 7.

An external reference electrode: the electrode that responds to the activity of hydrogen ions in solution and the electrode potential changes with it is called a pH indicating electrode or a pH measuring electrode. The pH indicating electrode includes hydrogen electrode, antimony electrode, glass electrode, etc., but glass electrode is most commonly used. The glass electrode is composed of glass rod and glass film sensitive to hydrogen ions, and has a thickness of 0.1-0.2mm, and resistance value less than 250MΩ and 25deg.C. The glass film is generally in a ball shape, an internal reference electrolyte is filled in the ball, a reference electrode (generally an Ag/AgCl electrode) is inserted, an electrode cap is used for sealing and leading out an electric wire, and a socket is arranged to form a pH indicating electrode. The electrolyte in the external reference electrode is liquid (saturated liquid KCL, which can be filled), gel (gel KCL, which is not easy to run off and does not need to be filled) and solid. Therefore, the electrodes can be classified into three types according to the electrolyte materials.

When measuring, the PH electrode 4 is inserted into the measured liquid, different electromotive forces are generated due to different hydrogen ion concentrations of the measured liquid, the electromotive forces are amplified by a direct current amplifier, and then the PH value of the measured liquid is indicated by a reading indicator (voltmeter).

In an alternative embodiment, the main cylinder 1 further comprises a third cylinder 13, the third cylinder 13 is arranged on one side of the second cylinder 12 away from the first cylinder 11, and the upper end surface of the third cylinder 13 is suitable for being attached to the lower end surface of the mounting plate 20 at the mounting hole, so that the length of the main cylinder 1 extending from the upper side of the mounting hole can be limited. Further, a first seal ring mounting groove is formed in the outer side surface, close to the third cylinder 13, of the second cylinder 12, and the first seal ring mounting groove is used for mounting the first seal ring 21. In this embodiment, the upper end surface of the third cylinder 13 is attached to the lower end surface of the mounting plate 20 at the mounting hole, the third cylinder 13 is used for positioning the connection between the second cylinder 12 and the mounting plate 20, and the outer side surface of the second cylinder 12, which is close to the third cylinder 13, is provided with the first sealing ring 21, which is beneficial to sealing connection between the second cylinder 12 and the mounting plate 20, and is beneficial to ensuring the tightness of the upper side of the mounting plate 20.

Further, the main cylinder 1 further comprises a fourth cylinder 14, the fourth cylinder 14 is arranged on one side, far away from the second cylinder 12, of the third cylinder 13, the lower end of the PH electrode 4 extends out of the fourth cylinder 14, the fourth cylinder 14 is detachably connected with a protective cap 15, and the protective cap 15 is sleeved outside the lower end of the PH electrode 4. The outer diameter size of the fourth cylinder 14 is not limited. In this embodiment, the protective cap 15 is filled with a protective liquid, and the protective liquid can effectively protect the lower end of the detection mechanism, so as to prolong the service life of the PH electrode.

Optionally, the outer diameters of the inner holes of the second cylinder 12, the third cylinder 13 and/or the fourth cylinder 14 are the same as the outer diameters of the corresponding structures of the detection mechanism; the third sealing ring 23 is arranged on the inner wall of the second cylinder 12, the third cylinder 13 and/or the fourth cylinder 14, so that the tightness of the connection between the detection mechanism and the main cylinder 1 can be ensured. The fourth cylinder 14 and the protective cap 15 may be screwed or clamped.

Further, the main cylinder 1 further comprises a fifth cylinder 16, wherein the fifth cylinder 16 is arranged on one side of the first cylinder 11 far from the second cylinder 12, and the outer diameter of the fifth cylinder 16 is equal to or smaller than the outer diameter of the first cylinder 11. The outer diameter of the fifth cylinder 16 is equal to or smaller than the outer diameter of the first cylinder 11, and it can be ensured that the fifth cylinder 16 smoothly extends upward from the lower side of the mounting hole to the upper side of the mounting hole. The detection mechanism further comprises a PH main control board 3 and an audio male head 5, the PH main control board 3 is arranged in the fifth cylinder body 16, the PH main control board 3 is electrically connected with the PH electrode 4 through the electric connector 6, the audio male head 5 extends out of one end, far away from the first cylinder body 11, of the fifth cylinder body 16, and the PH main control board 3 is electrically connected with the audio male head 5.

In this embodiment, as shown in fig. 4, the first cylinder 11, the second cylinder 12, the third cylinder 13, and the fourth cylinder 14 are integrally connected. The first cylinder 11 is detachably connected with the fifth cylinder 16, so that the detection mechanism is assembled into the main cylinder 1. The first cylinder 11 and the fifth cylinder 16 may be screwed or snapped. A fourth sealing ring 24 may also be provided at the junction of the first cylinder 11 and the fifth cylinder 16.

In order to facilitate the disassembly and assembly of the PH probe 10 from the lower side of the mounting plate 20, the specific structure of the main cylinder 1 is innovatively designed, and each part in the detection mechanism adopts each detection part in the prior art, and the detection principle is the same as that in the prior art. In order to facilitate the installation of the audio male head 5, an installation seat 17 is detachably connected to one end, far away from the first barrel 11, of the fifth barrel 16, the audio male head 5 is arranged on the installation seat 17, and the upper end of the audio male head 5 extends out of the installation seat 17. The mounting seat 17 is in threaded connection or clamping connection with the fifth cylinder 16; a fifth sealing ring 25 is arranged between the mounting seat 17 and the fifth cylinder 16.

The present embodiment also provides a water quality monitoring device, which includes a mounting plate 20 and a PH probe 10, wherein the PH probe 10 adopts the PH probe 10 described above, and the second cylinder 12 on the PH probe 10 is detachably connected with the mounting hole on the mounting plate 20.

Further, the water quality monitoring device further comprises a probe cylinder 30, the probe cylinder 30 is arranged on the upper side of the mounting plate 20, the lower end of the probe cylinder 30 is in sealing and detachable connection with the mounting hole, and an audio female seat 301 is arranged inside the upper end of the probe cylinder 30. The probe cylinder 30 and the mounting hole can be in threaded connection or clamping connection. A sixth sealing ring 26 is arranged between the outer side surface of the lower end of the probe cylinder 30 and the mounting hole. When the embodiment is installed, the audio male head 5 of the detection mechanism is connected with the audio female head, so that communication connection with a control main board of the water quality monitoring equipment can be realized, and detection data can be sent to the water quality monitoring equipment. Further, the water quality monitoring equipment also comprises a four-electrode conductivity probe, and a mounting opening for mounting the four-electrode conductivity probe is arranged on the mounting disc (20). The four-electrode conductivity probe is used for detecting the conductivity of the tested liquid.

Example 2

As shown in fig. 7 to 10, this embodiment is different from embodiment 1 in that the second cylinder 12, the third cylinder 13 and the fourth cylinder 14 are integrally connected, and the first cylinder 11 is detachably connected to the second cylinder 12 and the fifth cylinder 16, respectively. The second cylinder 12, the third cylinder 13 and the fourth cylinder 14 are integrally connected to form a PH electrode seat. A second seal ring 22 is provided between the inner end surface of the second cylinder 12 and the lower end surface of the first cylinder 11. The second seal ring 22 is attached to the lower end surface of the first cylinder 11. The second seal ring 22 is an O-ring. This is provided for ease of assembly. During calibration, the PH electrode seat is separated from the first cylinder 11, the first cylinder 11 is inserted into the calibration tool, the depth of the PH electrode immersed in the calibration liquid is increased, the second sealing ring 22 between the first cylinder 11 and the PH electrode is used for sealing, the calibration liquid is prevented from entering a gap between the first cylinder 11 and the PH electrode, the gap is not required to be cleaned during cleaning, and the cleaning of the PH probe after calibration and calibration is facilitated. The second cylinder 12 and the fifth cylinder 16 are respectively connected with the lower end and the upper end of the first cylinder 11 in a threaded or clamping way. Other structures and principles are the same as those of embodiment 1, and will not be described here again.

Finally, it should be noted that: the foregoing description of the preferred embodiments of the present utility model is not intended to be limiting, but rather, it will be apparent to those skilled in the art that the foregoing description of the preferred embodiments of the present utility model can be modified or equivalents can be substituted for some of the features thereof, and any modification, equivalent substitution, improvement or the like that is within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A PH probe, comprising:

the water quality monitoring device comprises a main cylinder (1), wherein the main cylinder (1) comprises a first cylinder body (11) and a second cylinder body (12), the second cylinder body (12) is arranged on the lower side of the first cylinder body (11), the second cylinder body (12) is used for being detachably connected with a mounting hole of a mounting disc (20) of the water quality monitoring device, and the outer diameter of the first cylinder body (11) is suitable for extending into the upper side of the mounting hole from the lower side of the mounting hole;

the detection mechanism comprises a PH electrode (4), wherein the upper end of the PH electrode (4) stretches into the first cylinder body (11), the lower end of the PH electrode (4) stretches out of the main cylinder (1), the PH electrode (4) is fixed relative to the first cylinder body (11), and the PH electrode (4) is used for detecting the concentration of hydrogen ions in the detected liquid.

2. The PH probe according to claim 1, wherein the main barrel (1) further comprises a third barrel (13), the third barrel (13) being provided on a side of the second barrel (12) remote from the first barrel (11), an upper side end surface of the third barrel (13) being adapted to be fitted with a lower side end surface of the mounting plate (20) at the mounting hole for limiting a length of the main barrel (1) protruding from an upper side of the mounting hole.

3. The PH probe according to claim 2, characterized in that the second cylinder (12) is provided with a first seal ring mounting groove on the outer side close to the third cylinder (13).

4. The PH probe according to claim 2, characterized in that the main cylinder (1) further comprises a fourth cylinder (14), the fourth cylinder (14) is arranged on one side of the third cylinder (13) far away from the second cylinder (12), the lower end of the PH electrode (4) extends out of the fourth cylinder (14), the fourth cylinder (14) is detachably connected with a protective cap (15), and the protective cap (15) is sleeved outside the lower end of the PH electrode (4).

5. The PH probe according to claim 4, wherein the main cylinder (1) further comprises a fifth cylinder (16), the fifth cylinder (16) being provided on a side of the first cylinder (11) remote from the second cylinder (12), an outer diameter of the fifth cylinder (16) being equal to or smaller than an outer diameter of the first cylinder (11);

the detection mechanism further comprises a PH main control board (3) and an audio male head (5), the PH main control board (3) is arranged in the fifth cylinder body (16), the PH main control board (3) is electrically connected with the PH electrode (4), the audio male head (5) extends out of one end, far away from the first cylinder body (11), of the fifth cylinder body (16), and the PH main control board (3) is electrically connected with the audio male head (5).

6. The PH probe according to claim 5, wherein the first cylinder (11), the second cylinder (12), the third cylinder (13) and the fourth cylinder (14) are integrally connected, and the first cylinder (11) is detachably connected to the fifth cylinder (16).

7. The PH probe according to claim 5, characterized in that the second cylinder (12), the third cylinder (13) and the fourth cylinder (14) are integrally connected, the first cylinder (11) being detachably connected to the second cylinder (12) and the fifth cylinder (16), respectively;

a second sealing ring (22) is arranged between the inner side end surface of the second cylinder (12) and the lower side end surface of the first cylinder (11), and/or a third sealing ring (23) is arranged between the inner side surface of the fourth cylinder (14) and the outer side surface of the PH electrode (4).

8. A water quality monitoring device comprising a mounting plate (20), further comprising a PH probe (10) according to any one of claims 1-7, wherein a second cylinder (12) on the PH probe (10) is detachably connected to a mounting hole on the mounting plate (20).

9. The water quality monitoring device according to claim 8, further comprising a probe cylinder (30), wherein the probe cylinder (30) is disposed on the upper side of the mounting plate (20), the lower end of the probe cylinder (30) is in sealing and detachable connection with the mounting hole, and an audio female seat (301) is disposed inside the upper end of the probe cylinder (30).

10. The water quality monitoring device according to claim 8, further comprising a four-electrode conductivity probe, wherein the mounting plate (20) is further provided with a mounting opening for mounting the four-electrode conductivity probe.