Water quality detection equipment

Abstract

The utility model discloses water quality detection equipment. The water quality detection equipment comprises a shell, a main water path and a filtering and flushing branch are arranged in the shell, and a mounting space for mounting an expansion detection branch is reserved. The main water path comprises a first electromagnetic valve, a water inlet filter, a water inlet flow meter, a first replaceable unit, a second replaceable unit, a water pump, a second electromagnetic valve, a first detection unit and a third replaceable unit which are connected, wherein the replaceable units can adopt connecting pipes or detection elements. The water quality detection equipment can meet basic water quality detection requirements with fewer elements and manufacturing cost, can be manufactured with a smaller shell and mounted in different scenes, and can replace the replaceable unit of the main water path and mount the extension detection branch according to specific requirements of different scenes, so that the water quality detection equipment is more convenient to use. Therefore, the water quality detection equipment of the type can realize low-cost mass production, and can meet different detection requirements in different scenes by increasing and changing the detection elements.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality detection, in particular to a water quality detection device. Background Art

[0002] Most of the existing water quality testing equipment is large in size and takes up a large space during installation, and can only be installed in a few scenarios. Moreover, most water quality testing equipment can only detect a few fixed indicators and cannot meet the specific testing needs of different scenarios. This means that for specific water quality testing equipment, it is not possible to reduce costs by expanding the scale of production. In other words, during design and production, water quality testing equipment suitable for different scenarios must be produced based on the installation and testing requirements of different scenarios, which is not conducive to achieving the versatility of components and the multi-scenario adaptability of water quality testing equipment.

[0003] Based on the above, there is an urgent need for a water quality testing device that can solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a water quality detection device, which can use different universal parts and components, is applicable to a variety of different scenarios, and is suitable for low-cost mass production.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The water quality detection device comprises a shell, the shell having a water inlet and a water outlet, a main waterway and a filtering and flushing branch are arranged in the shell, and an installation space for installing an extended detection branch is reserved, wherein:

[0007] Along the direction from the water inlet to the water outlet, the main water circuit includes a first solenoid valve, a water inlet filter, a water inlet flow meter, a first replaceable unit, a second replaceable unit, a water pump, a second solenoid valve, a first detection unit and a third replaceable unit, wherein the first replaceable unit, the second replaceable unit and the third replaceable unit selectively use a connecting pipe or a detection element; a filter flushing branch is also connected between the water pump and the first detection unit, and the filter flushing branch is used to flush the first detection unit; an extended detection branch can be connected between the second solenoid valve and the water outlet, and the extended detection branch includes a second detection unit.

[0008] Optionally, the filter-flushing branch includes a third solenoid valve, a first filter, a second filter and a first one-way valve connected in sequence, the water inlet end of the first one-way valve is connected to the second filter, and the water outlet end of the first one-way valve is connected to the water inlet end of the first detection unit.

[0009] Optionally, the filter flushing branch also includes a throttle valve, and the second filter adopts an RO filter, the RO filter has a clean water outlet and a waste water outlet, the clean water outlet is connected to the water inlet end of the first one-way valve, and the waste water outlet is connected to the water outlet through the throttle valve.

[0010] Optionally, the extended detection branch includes a fourth solenoid valve, a fourth replaceable unit and the second detection unit, and the fourth solenoid valve is located upstream of the fourth replaceable unit and the second detection unit.

[0011] Optionally, an installation space for installing an exhaust branch is reserved in the shell, an outlet end of the exhaust branch is connected between the water inlet flow meter and the water pump, and the exhaust branch is used to input air into the first detection unit to exhaust bubbles.

[0012] Optionally, the exhaust branch only includes the second one-way valve and the fifth solenoid valve.

[0013] Optionally, among the main water circuit, the filter-flushing branch, the exhaust branch and the extended detection branch, the water quality detection device is installed with at least the main water circuit and the filter-flushing branch.

[0014] Optionally, the water quality testing device further comprises a wall-mounted bracket, and the shell is detachably snap-connected to the wall-mounted bracket.

[0015] Optionally, the wall-mounted bracket includes a mounting plate, the mounting plate is provided with at least three mounting holes, and fasteners can be inserted into the mounting holes to fix the mounting plate; the mounting plate is also provided with a first card slot structure and a second card buckle structure, and the shell is provided with a first card buckle structure and a second card slot structure, the first card slot structure and the first card buckle structure can be connected by card buckle at the upper edge of the mounting plate, and the second card slot structure and the second card buckle structure can be connected by card buckle at the lower edge of the mounting plate.

[0016] Optionally, the shell includes a rotatably connected shell body and a first door body, the shell body has a water channel installation opening, the first door body is used to close the water channel installation opening, and at least one of the first filter and the second filter is installed on the inner surface of the first door body.

[0017] Optionally, the main water circuit only includes the first solenoid valve, the water inlet filter, the water inlet flow meter, the first replaceable unit, the second replaceable unit, the water pump, the second solenoid valve, the first detection unit and the third replaceable unit which are connected in sequence.

[0018] The beneficial effects of the water quality testing equipment provided by the utility model are that the water quality testing equipment is provided with a main water channel and a filtering and flushing branch in a shell, and can meet basic water quality testing needs with a smaller number of components and production costs, so that the entire water quality testing equipment can be produced with a smaller shell and installed in different scenarios, and according to the specific needs of different scenarios, the water quality testing equipment can also replace the replaceable units of the main water channel and install extended detection branches to detect more water quality parameters, so that this type of water quality testing equipment can not only achieve mass production at a lower cost, but also can achieve further different detection needs in different scenarios by adding and modifying detection elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of some water circuit components of the water quality testing equipment provided by the utility model;

[0020] Figure 2 This is a structural diagram of the water circuit components of the water quality testing equipment provided by the utility model;

[0021] Figure 3 It is a schematic diagram of the installation of the housing and the wall bracket of the water quality detection equipment in the utility model;

[0022] Figure 4 It is a structural schematic diagram of the housing body of the water quality detection equipment in the utility model;

[0023] Figure 5 It is a schematic diagram of the installation positions of the first filter and the second filter of the water quality detection equipment in the utility model;

[0024] Figure 6 It is a perspective view of the assembly of the water pump and the soundproof cover in the utility model;

[0025] Figure 7 It is a schematic diagram of the installation of the sound insulation cover in the utility model.

[0026] In the figure:

[0027] 11. Shell body; 12. Partition; 13. First door body; 14. Second door body; 101. Waterway cavity; 102. Electrical cavity; 15. Soundproof cover;

[0028] 21. Mounting plate; 211. First card slot structure; 212. Second card buckle structure; 2121. Fixing hole; 22. Expansion screw; 23. Fastening nut; 24. Mounting screw;

[0029] 31. First replaceable unit; 32. Second replaceable unit; 33. First detection unit; 34. Second detection unit; 35. Fourth solenoid valve; 36. First filter; 37. Second filter; 38. Water pump. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Refer to the following Figures 1 to 7 The utility model is introduced to provide a water quality detection device.

[0034] like Figure 1 to Figure 2 As shown, the water quality detection equipment mainly includes a shell and a water circuit component and an electrical component installed inside the shell. The water circuit component includes a main water circuit, a filter flushing branch and an optionally installed extended detection branch. The main water circuit and the filter flushing branch are both installed inside the shell, and the shell also has a reserved installation space for installing the extended detection branch. Both the main water circuit and the extended detection branch include detection elements that can detect water quality parameters. The filter flushing branch can filter water and use the filtered clean water to flush the detection element to improve the accuracy of repeated detection and the service life of the detection element. The electrical component is used to control the detection element and solenoid valve in the water circuit component, and can collect and process the water quality parameters detected by the detection element.

[0035] The shell has a water inlet and a water outlet, the water inlet end of the main water circuit is connected to the water inlet, and the water outlet end is connected to the water outlet. The main water circuit includes a first solenoid valve, a water inlet filter, a water inlet flowmeter, a first replaceable unit 31, a second replaceable unit 32, a water pump 38, a second solenoid valve, a first detection unit 33 and a third replaceable unit (adjacent elements can be connected in the same direction or in a reverse direction through conventional connecting pipes, and the utility model does not specifically limit this. Adding conventional connecting pipes on the basis of the above-mentioned functional water circuit elements also falls within the scope of protection of the utility model). Among them, the first solenoid valve serves as a water inlet main valve, which is used to control whether the water quality detection equipment is taking in water. The water inlet filter adopts a micro filter for preliminary filtration to meet the water inlet requirements of components such as the water pump 38 and the first detection unit 33, so as to ensure the service life of the water quality detection equipment. The water pump 38 serves as a driving element, which can drive water to flow along the main water circuit. The second solenoid valve can cooperate with the water pump 38 to control the water in the first detection unit 33 to keep it in a static state or a flowing state, thereby realizing static detection and dynamic detection respectively to meet different detection requirements. When the main water path is connected in a specific order using only the above-mentioned water path components, the detection requirements can be met with the least number of parts, and the volume of the water quality detection equipment can be reduced to the greatest extent.

[0036] The first replaceable unit 31, the second replaceable unit 32 and the third replaceable unit all selectively use connecting tubes or detection elements, and a space is reserved in the housing for installing or replacing the first replaceable unit 31, the second replaceable unit 32 and the third replaceable unit. In other words, when the water quality detection device is produced, it can be mass-produced with the same structure and components, and when determining the specific use scenario of a certain water quality detection device, according to actual needs, the corresponding detection element or connecting tube is used as the first replaceable unit 31, the second replaceable unit 32 and the third replaceable unit to be installed in the main waterway, so that the detection requirements for different water quality parameters required by different scenarios can be conveniently and quickly met.

[0037] The filter flushing branch is connected between the water pump 38 and the first detection unit 33. The water pump 38 pumps water into the filter flushing branch to obtain clean water after filtration. The clean water can flow into the first detection unit 33 to flush the first detection unit 33. An interface is reserved downstream of the second solenoid valve, which is used to connect the extended detection branch between the second solenoid valve and the water outlet. The extended detection branch includes a second detection unit 34. When the water quality detection equipment is installed with an extended detection branch, the second detection unit 34 can be used to detect more water quality parameters on the basis of the first detection unit 33 to reflect the water quality status in more detail.

[0038] The water quality testing equipment is provided with a main water circuit and a filtering and flushing branch circuit in a shell, and can meet basic water quality testing requirements with a smaller number of components and production costs, so that the entire water quality testing equipment can be produced with a smaller shell and installed in different scenarios. Moreover, according to the specific requirements of different scenarios, the water quality testing equipment can also replace the replaceable units of the main water circuit and install extended detection branches to detect more water quality parameters, so that this type of water quality testing equipment can not only achieve mass production at a lower cost, but also achieve further different detection requirements in different scenarios by adding and modifying detection components.

[0039] Furthermore, if Figure 2 As shown, the filter flushing branch includes a third solenoid valve, a first filter 36, a second filter 37 and a first one-way valve connected in sequence, the water inlet end of the first one-way valve is connected to the second filter 37, and the water outlet end of the first one-way valve is connected to the water inlet end of the first detection unit 33. Among them, the third solenoid valve is used to control whether to perform filter flushing, and the first one-way valve is used to prevent the reverse flow of water. When in use, by controlling the third solenoid valve, water flows through the first filter 36 and the second filter 37 and is filtered into clean water. The clean water flows into the first detection unit 33 through the first one-way valve (when an extended detection branch is installed, it can also flow into the extended detection branch for flushing), which can flush the first detection unit 33, thereby improving the accuracy and precision of repeated detection and ensuring its service life.

[0040] Furthermore, in the present embodiment, the first filter 36 adopts a CF filter, and the second filter 37 adopts an RO filter. When filtering, the RO filter will form clean water and waste water in a ratio of 1:3, and flow out of the RO filter through the clean water outlet and the waste water outlet of the RO filter respectively. The filter flushing branch also includes a throttle valve, the clean water outlet is connected to the water inlet end of the first one-way valve, and the waste water outlet is connected to the water outlet through the throttle valve, and the flow is limited according to specific needs when passing through the throttle valve, and finally the waste water generated by the RO filter is directly discharged through the water outlet. Preferably, in the present embodiment, the throttle valve is adjustable, which is convenient for adjusting the amount of filtered water according to the flushing needs, thereby saving water.

[0041] Continue to refer Figure 2 As shown, the extended detection branch includes a fourth solenoid valve 35, a fourth replaceable unit and a second detection unit 34, and the fourth solenoid valve 35 is located upstream of the fourth replaceable unit and the second detection unit 34. The fourth replaceable unit is similar to the first replaceable unit 31, and also selectively uses a connecting pipe or a detection element. After the extended detection branch is installed, by controlling the fourth solenoid valve 35 and the second solenoid valve, it is possible to selectively make only the first detection unit 33 perform detection, or the first detection unit 33 and the second detection unit 34 perform detection at the same time, so as to meet different detection requirements.

[0042] Preferably, in this embodiment, an installation space for installing an exhaust branch is reserved in the shell, and the air outlet end of the exhaust branch is connected between the water inlet flow meter and the water pump 38. The exhaust branch is used to input air to the first detection unit 33 (and the remaining detection elements) to expel bubbles. Further preferably, the exhaust branch only includes the second one-way valve and the fifth solenoid valve, with a small number of parts and components, no risk of backflow, and is conducive to reducing the volume of the entire water quality detection equipment, and further reducing the difficulty of its installation in different scenarios (similar to the above, adding a conventional connecting pipe to the above-mentioned exhaust branch also falls within the scope of protection of the utility model). The air enters the exhaust branch through the second one-way valve, and after passing through the fifth solenoid valve, it flows into the first replaceable unit 31, and can have the effect of removing bubbles for each downstream replaceable unit and detection unit.

[0043] It should be noted that, in some embodiments, only the main water circuit and the filter flushing branch may be installed in the shell, or an exhaust branch or an extended detection branch may be further installed in the main water circuit and the filter flushing branch, or the main water circuit, the filter flushing branch, the exhaust branch and the extended detection branch may all be installed in the shell, and this is not specifically limited in the present utility model.

[0044] When in use, illustratively, an exhaust branch and an extended detection branch are installed, and the replaceable units all use detection elements. When sampling, the water pump 38 is turned on, and the water to be tested enters the water quality detection equipment through the water inlet. After passing through the first solenoid valve, the water inlet filter, and the flow meter, it first enters the first replaceable unit 31 and the second replaceable unit 32 for detection, and then passes through the second solenoid valve to enter the first detection unit 33 and the third replaceable unit for detection, and then flows out of the water outlet. At the same time, when the fourth solenoid valve 35 is turned on, the water to be tested will also flow into the extended detection branch, be detected by the second detection unit 34 and the fourth replaceable unit, and be discharged from the water outlet. The flow meter detects whether there is water flowing through, and feeds back a signal to the electronic control PCB in the electrical component. The electronic control PCB is connected to the water pump 38 and the relevant solenoid valve signals, and controls the opening and closing of the water pump 38 and the relevant solenoid valves in one or more ways such as timing, thereby completing the sampling.

[0045] Furthermore, when sampling, the water pump 38, the first electromagnetic valve, the second electromagnetic valve, and the fourth electromagnetic valve 35 are all in the open state through the electronic control PCB, so that a round of dynamic detection can be achieved, that is, detection is performed when the water to be tested flows through the first detection unit 33 and other detection elements. Of course, after the dynamic detection, the second electromagnetic valve can also be closed through the electronic control PCB, so that the water to be tested stays in the first detection unit 33 and other detection elements, thereby achieving a round of static detection.

[0046] After sampling and testing, the water pump 38, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve 35 are all in the open state through the electronic control PCB, and water will enter the filter flushing branch, and after filtering, flow into the extended detection branch and the first detection unit 33 (and the third replaceable unit), thereby flushing the inside of the detection element. The electronic control PCB can control the specific flushing steps according to parameters such as flow rate and time, and can also control the second solenoid valve and the third solenoid valve to achieve separate flushing of the extended detection branch and separate flushing of the first detection unit 33 (and the third replaceable unit), meet different flushing requirements, and facilitate automatic calibration of the detection element after flushing.

[0047] Continue to refer to Figure 2 As shown, after each round of detection, the water pump 38 and the fifth solenoid valve can be controlled by the electronic control PCB to suck air from the exhaust branch, and by controlling the remaining solenoid valves, the air can flow through the first replaceable unit 31, the second replaceable unit 32, the first detection unit 33, the third replaceable unit, the second detection unit 34 and the fourth replaceable unit, pushing the water therein to be discharged, thereby removing the bubbles attached to the inner wall of the detection element and ensuring the precision and accuracy of the detection.

[0048] Optionally, in this embodiment, if Figure 3 As shown, the water quality testing device also includes a wall-mounted bracket, and the shell is detachably snap-connected to the wall-mounted bracket to facilitate the installation and disassembly of the water quality testing device in various scenarios.

[0049] Specifically, the wall bracket includes a mounting plate 21, and the mounting plate 21 is provided with at least three mounting holes, and fasteners can be inserted into the mounting holes to fix the mounting plate 21. Preferably, the mounting plate 21 is a square plate body, and three mounting holes are provided on both sides of the square plate body. The fasteners are expansion screws 22, and the expansion screws 22 are buried in the wall to be installed. During installation, it is only necessary to hang the mounting plate 21 on the wall corresponding to the expansion screws 22 and fix it by fastening the nuts 23. The mounting plate 21 can also play a role in drilling and positioning the expansion screws 22 during installation, which can facilitate the installer to find the buried position of the expansion screws 22, and further reduce the difficulty of installing the water quality detection equipment.

[0050] Furthermore, the mounting plate 21 is also provided with a first snap-in structure 211 and a second snap-in structure 212, and the shell is provided with a first snap-in structure and a second snap-in structure, and the first snap-in structure 211 and the first snap-in structure can be snap-connected at the upper edge of the mounting plate 21, and the second snap-in structure and the second snap-in structure 212 can be snap-connected at the lower edge of the mounting plate 21. The snap-in connection method can further facilitate the fixing and movement of the shell, thereby further improving the installation and maintenance compatibility of the water quality detection equipment in different scenarios. Preferably, the second snap-in structure 212 is also provided with a fixing hole 2121, and the mounting screw 24 can pass through the fixing hole 2121 and be threadedly connected to the shell to further fix the shell to the mounting plate 21.

[0051] like Figure 4 As shown, in this embodiment, the interior of the housing is separated by a partition 12 to form a water channel cavity 101 and an electrical cavity 102. The water channel cavity 101 is used to accommodate water channel components, and the electrical cavity 102 is used to accommodate electrical components, forming water and electricity isolation to avoid mutual influence. The partition 12 is provided with a through hole, which can electrically connect the solenoid valve, water pump 38, etc. located in the water channel cavity 101 to the electrical components located in the electrical cavity 102.

[0052] More specifically, the shell includes a shell body 11, a first door body 13 and a second door body 14. The partition 12 is arranged in the shell body 11 to separate the water path cavity 101 and the electrical cavity 102. The water path cavity 101 is formed with a water path installation port on one side of the shell body 11, and the water path component can be installed in the water path cavity 101 through the water path installation port. The first door body 13 is used to close the water path installation port. The electrical cavity 102 is formed with an electrical installation port on one side of the shell body 11 adjacent to the water path installation port, and the electrical component can be installed in the electrical cavity 102 through the electrical installation port. The second door body 14 is used to close the electrical installation port, and it is also convenient to maintain the electrical component separately. Preferably, as Figure 5 As shown, at least one of the first filter 36 and the second filter 37 is installed on the inner surface of the first door body 13 to facilitate maintenance operations such as filter element replacement and repair of the first filter 36 and the second filter 37 .

[0053] Furthermore, if Figure 6 , Figure 7 As shown, in this embodiment, a soundproof cover 15 is also provided outside the water pump 38, which can greatly reduce the noise of the water pump 38 when it is working, so that the water quality detection equipment can be set up in scenes with high requirements on the ambient volume, such as libraries and classrooms. Specifically, the water pump 38 is installed on the inside of the soundproof cover 15 through fasteners, and the soundproof cover 15 is installed on the shell body 11 through fasteners, which not only avoids the noise amplification problem caused by directly connecting the water pump 38 and the shell body 11, but also can limit the propagation range of the noise through the soundproof cover 15.

[0054] In the description of this specification, the description of reference terms such as "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] 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 methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Water quality testing equipment, characterized in that, The invention comprises a housing having a water inlet and a water outlet, a main waterway and a filtering and flushing branch are arranged in the housing, and an installation space for installing an extended detection branch is reserved, wherein: Along the direction from the water inlet to the water outlet, the main water path includes a first solenoid valve, a water inlet filter, a water inlet flow meter, a first replaceable unit (31), a second replaceable unit (32), a water pump (38), a second solenoid valve, a first detection unit (33) and a third replaceable unit, wherein the first replaceable unit (31), the second replaceable unit (32) and the third replaceable unit are selectively connected to each other and are connected by a connecting pipe or a detection element. The filter flushing branch is also connected between the water pump (38) and the first detection unit (33), and the filter flushing branch is used to flush the first detection unit (33); The extended detection branch can be connected between the second solenoid valve and the water outlet, and the extended detection branch includes a second detection unit (34).

2. The water quality testing equipment according to claim 1, characterized in that: The filtering and flushing branch comprises a third solenoid valve, a first filter (36), a second filter (37) and a first one-way valve which are connected in sequence, wherein the water inlet end of the first one-way valve is connected to the second filter (37), and the water outlet end of the first one-way valve is connected to the water inlet end of the first detection unit (33).

3. The water quality testing equipment according to claim 2, characterized in that: The filtering and flushing branch also includes a throttle valve. The second filter (37) is an RO filter. The RO filter has a clean water outlet and a waste water outlet. The clean water outlet is connected to the water inlet end of the first one-way valve, and the waste water outlet is connected to the water outlet through the throttle valve.

4. The water quality testing equipment according to claim 2, characterized in that: The extended detection branch comprises a fourth solenoid valve (35), a fourth replaceable unit and the second detection unit (34), and the fourth solenoid valve (35) is located upstream of the fourth replaceable unit and the second detection unit (34).

5. The water quality testing device according to claim 4, characterized in that: The housing also reserves an installation space for installing an exhaust branch, the exhaust branch having an outlet end connected between the water inlet flow meter and the water pump (38), and the exhaust branch is used to input air into the first detection unit (33) to exhaust bubbles.

6. The water quality testing device according to claim 5, characterized in that: The exhaust branch only includes the second one-way valve and the fifth solenoid valve.

7. The water quality testing device according to claim 5, characterized in that: In the main water circuit, the filter-flushing branch, the exhaust branch and the extended detection branch, the water quality detection device is installed with at least the main water circuit and the filter-flushing branch.

8. The water quality testing device according to claim 7, characterized in that: The water quality detection device also includes a wall-mounted bracket, and the shell is snap-connected to the wall-mounted bracket in a detachable manner.

9. The water quality testing device according to claim 8, characterized in that: The wall-mounted bracket comprises a mounting plate (21), wherein the mounting plate (21) is provided with at least three mounting holes, and fasteners can be inserted through the mounting holes to fix the mounting plate (21); The mounting plate (21) is further provided with a first snap-in structure (211) and a second snap-in structure (212); the housing is provided with a first snap-in structure and a second snap-in structure; the first snap-in structure (211) and the first snap-in structure can be snap-connected to the upper edge of the mounting plate (21); and the second snap-in structure and the second snap-in structure (212) can be snap-connected to the lower edge of the mounting plate (21).

10. The water quality testing equipment according to claim 2, characterized in that: The shell comprises a rotatably connected shell body (11) and a first door body (13), the shell body (11) having a water channel installation opening, the first door body (13) being used to close the water channel installation opening, and at least one of the first filter (36) and the second filter (37) being installed on the inner surface of the first door body (13).

11. The water quality testing device according to any one of claims 1 to 10, characterized in that: The main water circuit only includes the first solenoid valve, the water inlet filter, the water inlet flow meter, the first replaceable unit (31), the second replaceable unit (32), the water pump (38), the second solenoid valve, the first detection unit (33) and the third replaceable unit which are connected in sequence.

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