Water injection device for detecting total metal release from inner wall of faucet

Abstract

This utility model discloses a water injection device for detecting the total metal release from the inner wall of a faucet, including a support frame, an electronic scale, a magnetic stirrer, a material bucket, a vacuum pump, a temporary storage tank, and a piping system. The electronic scale is placed on the base of the support frame, the magnetic stirrer is fixed on the electronic scale, and the material bucket is located in the stirring area to hold the test liquid. The temporary storage tank is installed on top of the support frame, and a three-way valve is provided at its bottom outlet. The piping system includes a suction pipe, a water injection pipe, and a wastewater pipe: the suction pipe connects the bottom of the material bucket and the top of the temporary storage tank, and the vacuum pump is connected to the suction pipe to draw liquid; the water injection pipe extends from the first outlet of the three-way valve to the inlet of the faucet under test and is equipped with a flow control valve; the wastewater pipe leads from the second outlet of the three-way valve to a waste liquid treatment container; the installation height of the temporary storage tank creates a gravity-driven liquid level difference between its bottom outlet and the faucet inlet, achieving automatic water injection control. This device is used for detecting the total metal release from the inner wall of a faucet, ensuring standardized testing and accurate results.

Description

Technical Field

[0001] This utility model relates to the technical field of faucet testing equipment. More specifically, this utility model relates to a water injection device for detecting the total metal release from the inner wall of a faucet. Background Technology

[0002] In the field of drinking water safety testing, determining the total metal leaching from the inner wall of faucets is a crucial step in assessing whether a product meets hygiene standards. Current testing methods typically rely on manual operation for liquid transfer and water injection, which has the following limitations: First, the test solution (such as acidic immersion solution) needs to be manually transferred multiple times from the preparation container to the injection device, a cumbersome and time-consuming process. Frequent liquid transfers and container contact increase the risk of sample contamination, particularly the potential introduction of non-tested metal impurities, directly affecting the accuracy of the test results. Second, when injecting water into the faucet, operators must manually control the flow rate and time, making it difficult to precisely maintain a constant low flow rate (e.g., simulating actual usage conditions). Fluctuations in manual adjustment can lead to inconsistent water volume, affecting the reproducibility of metal leaching conditions. Furthermore, the water injection process lacks a stable driving force control mechanism, often relying on simple elevated water tanks or small pumps. Elevated water tanks occupy a large space, and the pressure decreases as the liquid level drops, making it difficult to achieve a continuous and stable low-flow output. Mechanical pumping may cause changes in the composition of the test solution due to pulsation or impeller contact (such as the shedding of metal particles or changes in oxidation state), and there is a risk of residual contamination that is difficult to clean thoroughly. In addition, the test solution is prone to sedimentation or stratification during standing, requiring manual stirring at regular intervals to maintain homogeneity, but the timing and intensity of stirring are difficult to standardize, which may lead to differences in dissolution conditions between batches. The above operations rely on experience and are labor-intensive, resulting in low efficiency when testing multiple samples continuously, and significant human error factors. Utility Model Content

[0003] The purpose of this invention is to provide a water injection device for detecting the total metal release from the inner wall of a faucet, so as to at least solve the above-mentioned problems.

[0004] To achieve the objectives and other advantages of this utility model, a water injection device for detecting the total metal release from the inner wall of a faucet is provided, comprising: a support frame, an electronic scale, a magnetic stirrer, a material bucket, a vacuum pump, a temporary storage tank, and a piping system; wherein, the electronic scale is placed on the base of the support frame, the magnetic stirrer is fixedly mounted on the weighing platform of the electronic scale, and the material bucket is placed in the stirring area of ​​the magnetic stirrer; the temporary storage tank is fixedly installed on the top of the support frame, and a three-way valve is provided at the bottom outlet of the temporary storage tank; the piping system includes a suction pipe. The system includes a water supply pipeline, a water injection pipeline, and a wastewater pipeline. One end of the suction pipeline is connected to the bottom of the material tank, and the other end is connected to the top of the temporary storage tank. The vacuum pump is connected in series in the suction pipeline. One end of the water injection pipeline is connected to the first outlet of the three-way valve, and the other end is connected to the inlet of the faucet to be tested. The water injection pipeline is equipped with a flow control valve. One end of the wastewater pipeline is connected to the second outlet of the three-way valve, and the other end is connected to the waste liquid treatment container. The installation height of the temporary storage tank creates a gravity-driven liquid level difference between its bottom outlet and the inlet of the faucet to be tested.

[0005] Preferably, the water inlet pipe is connected to the faucet via a quick-sealing connector, which includes an interface portion and a socket portion. The interface portion includes a valve body, the rear end of which is detachably connected to the water inlet pipe, an elastic seal disposed within the cavity of the valve body, and a spring fixed between the rear end of the elastic seal and the bottom wall of the valve body. The front end of the elastic seal has a conical sealing surface. The front end of the valve body has a valve port, the inner wall of which has a conical surface adapted to the conical sealing surface. The socket portion includes a top tube, which is detachably connected to the faucet. The side wall of the top tube away from the faucet has multiple through holes spaced apart. The top tube is configured to extend into the valve port and push the elastic seal backward, causing the conical sealing surface to separate from the conical surface of the valve port, thus opening the flow channel.

[0006] Preferably, the outer wall of the top pipe is provided with a limiting protrusion ring, the limiting protrusion ring is located below the plurality of through holes, and the outer diameter of the limiting protrusion ring is larger than the outer diameter of the valve port.

[0007] Preferably, the inner walls of both the suction pipe and the water injection pipe are lined with a chemically inert material.

[0008] Preferably, the suction pipeline between the vacuum pump and the temporary storage tank is equipped with an anti-backflow valve, and the vacuum pump outlet is connected to the waste gas treatment container.

[0009] Preferably, the top of the material hopper is provided with a top cover with a sealing structure, which integrates a suction pipe insertion interface and an inert gas injection interface.

[0010] Preferably, the temporary storage tank is made of a transparent and corrosion-resistant material, the outer wall of the temporary storage tank is marked with volume scale, and an air-filtered pressure balancer is installed on the top.

[0011] Preferably, the flow control valve is a controlled proportional valve, the three-way valve is a solenoid three-way valve, and both the flow control valve and the three-way valve are connected to the controller of the water injection device.

[0012] Preferably, the base has a caster wheel with brakes at each of its four bottom corners.

[0013] This utility model has at least the following beneficial effects:

[0014] First, this device integrates an electronic scale, magnetic stirrer, material tank, temporary storage tank, and piping system through a support frame, realizing a closed-loop process for test solution preparation, storage, transfer, and water injection. The electronic scale monitors the weight change of the material tank in real time, and the magnetic stirrer maintains the uniformity of the test solution, avoiding contamination and solution sedimentation caused by manual transfer. A vacuum pump automatically transfers the test solution from the material tank to the high-level temporary storage tank through a suction pipeline. The gravity-driven liquid level difference between the temporary storage tank and the water inlet provides a stable, pulsation-free water injection pressure, replacing the mechanical pump which is prone to introducing contamination and pressure fluctuations. The flow rate of the water injection pipeline and the switching of water injection / waste discharge modes are precisely controlled by a three-way valve and a flow control valve, significantly reducing manual operation steps and improving the efficiency of the testing process and the reproducibility and accuracy of the metal release test results.

[0015] Secondly, the quick-sealing connector uses an elastic seal at its interface, which, under the action of a spring, forms a self-tightening seal with the conical surface of the valve port, effectively preventing liquid leakage and air intrusion contamination when the water injection pipeline is not connected. When the top tube at the spigot is inserted into the valve port, it automatically opens the elastic seal, opening the flow channel. At the same time, the through hole on the side wall of the top tube ensures a smooth water passage, avoiding abrupt changes in the flow path. This design enables quick and reliable connection and disconnection from the faucet inlet without complicated tightening or locking operations, significantly shortening the faucet sample replacement time. It is particularly suitable for applications requiring continuous testing of multiple samples.

[0016] Third, a limiting protrusion ring is installed on the outer wall of the jacking pipe. Its outer diameter is larger than that of the valve port. After the jacking pipe is inserted into the interface, the protrusion ring abuts against the valve port end face, providing reliable axial limiting. This effectively prevents the jacking pipe from becoming detached from the valve port due to pipeline pressure, vibration, or accidental contact during testing, ensuring the stability of the connection and seal. Simultaneously, the position of the protrusion ring limits the insertion depth of the jacking pipe, preventing excessive compression of the elastic seal and thus avoiding permanent deformation of the spring or damage to the sealing surface, extending the service life of the sealing assembly.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a water injection device for detecting total metal release from the inner wall of a faucet, according to an embodiment of this utility model.

[0019] Figure 2 This is a cross-sectional view of a quick-sealing connector according to another embodiment of the present invention.

[0020] In the diagram, 1. Support frame, 2. Electronic scale, 3. Magnetic stirrer, 4. Material bucket, 5. Vacuum pump, 6. Temporary storage tank, 7. Base, 8. Three-way valve, 9. Suction pipe, 10. Water injection pipe, 11. Wastewater pipe, 12. Flow control valve, 13. Waste liquid treatment container, 14. Valve body, 15. Elastic seal, 16. Spring, 17. Top pipe, 18. Through hole, 19. Limiting ring, 20. Caster wheel, 21. Faucet. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings, so that those skilled in the art can implement it based on the description.

[0022] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0023] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] like Figure 1 , Figure 2As shown, one embodiment of this utility model provides a water injection device for detecting the total metal release from the inner wall of a faucet, comprising: a support frame 1, an electronic scale 2, a magnetic stirrer 3, a material bucket 4, a vacuum pump 5, a temporary storage tank 6, and a piping system; wherein, the electronic scale 2 is placed on the base 7 of the support frame 1, the magnetic stirrer 3 is fixedly installed on the weighing platform of the electronic scale 2, and the material bucket 4 is placed in the stirring area of ​​the magnetic stirrer 3; the temporary storage tank 6 is fixedly installed on the top of the support frame 1, and a three-way valve 8 is provided at the bottom outlet of the temporary storage tank 6; the piping system includes a suction pipe 9 and a water injection pipe. 10 and wastewater pipeline 11, one end of the suction pipeline 9 is connected to the bottom of the material bucket 4, and the other end is connected to the top of the temporary storage tank 6, and the vacuum pump 5 is connected in series to the suction pipeline 9; one end of the water injection pipeline 10 is connected to the first outlet of the three-way valve 8, and the other end is connected to the inlet of the water tap 21 to be tested, and the water injection pipeline 10 is equipped with a flow control valve 12; one end of the wastewater pipeline 11 is connected to the second outlet of the three-way valve 8, and the other end is connected to the waste liquid treatment container 13; and the installation height of the temporary storage tank 6 forms a gravity-driven liquid level difference between its bottom outlet and the inlet of the water tap 21 to be tested.

[0025] In the above embodiment, the base 7 of the support frame 1 is a welded carbon steel frame with an epoxy coating for corrosion protection, capable of bearing a static load of not less than 50 kg. The electronic scale 2 is an electronic balance with a range of 0-30 kg and an accuracy of ±0.1 g, fixed to the central plane of the base 7 by bolts. The magnetic stirrer 3 is a brushless motor driven type with a maximum stirring capacity of 5 L. Its base is embedded in the weighing platform of the electronic scale 2 and fixed with positioning pins. The stir bar can use a fully encapsulated PFA magnetic core. The material tank 4 can be a cylindrical borosilicate glass container or a plastic container with a volume of 5 L, placed in the center of the stirring area of ​​the magnetic stirrer 3, with its bottom 5-10 mm away from the stirring pole. During assembly, the level of the support frame 1 needs to be adjusted to ensure that the reading of the electronic scale 2 is not affected by off-center loading. During operation, the test solution is uniformly mixed in the material tank 4 by the magnetic stirrer 3 at a speed of 200-500 rpm. The electronic scale 2 records the change in solution weight in real time for calculating consumption.

[0026] Vacuum pump 5 is a diaphragm vacuum pump with an ultimate vacuum of -80 kPa. It is connected in series to the middle section of suction line 9 via a pressure-resistant hose. Suction line 9 has an inner diameter of 8 mm and can be lined with PTFE material. Both ends can be connected to the PTFE valve at the bottom of material tank 4 and the quick-connect interface at the top of temporary storage tank 6, respectively. Temporary storage tank 6 has a volume of 1-2 L and is installed on the top crossbeam of support frame 1. Its bottom outlet centerline is 1.2-1.8 m from the upper plane of base 7. After vacuum pump 5 is started, the test liquid in material tank 4 is drawn into temporary storage tank 6 in batches. The liquid level difference design must ensure that the height difference between the bottom outlet of temporary storage tank 6 and the water inlet of faucet 21 is ≥0.5 m to form gravity-driven pressure. After the test liquid is transferred, vacuum pump 5 is turned off, and the liquid in temporary storage tank 6 is allowed to stand and defoam for later use.

[0027] The three-way valve 8 is installed at the bottom outlet of the temporary storage tank 6, and the valve body is made of polyetheretherketone (PEEK). The water injection line 10 can be a 6mm inner diameter FEP hose, with one end connected to the first outlet of the three-way valve 8 and the other end connected to the inlet of the faucet 21 via a quick-connect fitting. A flow control valve 12 is installed in the middle of the line. The wastewater line 11 can be a 10mm inner diameter PVC hose, connecting the second outlet of the three-way valve 8 to the waste liquid treatment container 13. The flow control valve 12 can be a needle valve, with the water injection flow rate set manually within the range of 0.1L / min ± 0.02L / min. Operating procedure: Open the three-way valve 8 to the water injection channel; the test liquid flows by gravity through the water injection line 10 and into the faucet 21. After water injection, switch the three-way valve 8 to the waste discharge channel; the residual liquid is discharged into the waste liquid treatment container 13.

[0028] This implementation avoids external contamination through a closed liquid transfer path, and gravity-driven water injection eliminates pressure pulsations caused by mechanical pumps, making the metal release conditions closer to actual usage scenarios. Precise adjustment of the flow control valve 12 ensures stable water injection rate, and the rapid switching of the three-way valve 8 reduces cross-contamination of residual liquid in the pipeline. The magnetic stirrer 3 maintains the homogeneity of the test liquid, and the electronic scale 2 monitors in real time to reduce human error. In 10 consecutive tests, the overall device exhibited a water injection rate fluctuation of <5%, and the relative standard deviation of metal detection results between samples was reduced to within 8%.

[0029] In another embodiment, the water inlet pipe 10 is connected to the faucet 21 via a quick-sealing connector, which includes an interface portion and a socket portion. The interface portion includes a valve body 14, the rear end of which is detachably connected to the water inlet pipe 10, an elastic seal 15 disposed within the cavity of the valve body 14, and a spring 16 fixed between the rear end of the elastic seal 15 and the bottom wall of the valve body 14. The front end of the elastic seal 15 has a conical sealing surface. The front end of the valve body 14 has a valve port, the inner wall of which has a conical surface adapted to the conical sealing surface. The socket portion includes a top tube 17, which is detachably connected to the faucet 21. The side wall of the top tube 17 away from the faucet 21 has multiple through holes 18 spaced apart. The top tube 17 is configured to extend into the valve port and push the elastic seal 15 backward, causing the conical sealing surface to separate from the conical surface of the valve port, thus opening the flow channel. Furthermore, the outer wall of the top pipe 17 is provided with a limiting protrusion ring 19, which is located below the plurality of through holes 18, and the outer diameter of the limiting protrusion ring 19 is larger than the outer diameter of the valve port.

[0030] In the above embodiment, the valve body 14 is made of polyetheretherketone (PEEK), and its rear end is connected to the water injection pipeline 10 via a compression fitting. The elastic seal 15 can be made of fluororubber with a Shore A hardness of 70-80 degrees, and its front end is machined with a 60° conical sealing surface. The spring 16 can be a PTFE-coated fluororubber spring with a free length of 25mm and an installation pre-compression force of 5-8N. During assembly, the elastic seal 15 is placed in the front section of the cavity of the valve body 14, and the spring 16 abuts against its rear end between the bottom wall of the valve body. Under normal conditions, the spring thrust causes the conical sealing surface to fit tightly against the 60° conical surface inside the valve port, forming a sealing pressure ≥0.4MPa. This structure can effectively prevent leakage of residual liquid in the water injection pipeline 10 and the intrusion of external air when not connected.

[0031] The jacking tube 17 is made of perfluoroalkoxy resin (PFA) with an outer diameter of 6 mm and a wall thickness of 1 mm, and a 30° guiding cone angle is machined at the front end. Four through holes 18 with a diameter of 3 mm are evenly distributed circumferentially at a distance of 15 mm from the end of the tube. The end of the jacking tube 17 can be connected to the inlet of the faucet 21 via a thread. During operation, the jacking tube 17 is inserted axially into the valve port, and the end of the tube pushes the elastic seal 15 backward by 4-6 mm to compress the spring 16, causing the conical sealing surface to disengage from the conical surface of the valve port. At this time, the test liquid flows in from the gap between the valve port and the outer wall of the jacking tube 17, and enters the inner flow channel of the jacking tube 17 through the through holes 18. The limiting protrusion ring 19 is located 5 mm below the through holes 18, and the outer diameter of the protrusion ring is larger than the outer diameter of the valve port.

[0032] Post-assembly testing: Insert the top tube 17 into the valve body 14 until the limiting ring 19 contacts the valve port end face, and apply a 10N axial tensile force to verify no loosening. No leakage was detected at the interface under a water pressure of 0.05MPa. In actual use, the connection operation takes ≤3 seconds, and the spring 16 pushes the seal 15 to reset in <0.5 seconds after removing the top tube 17. After 200 insertion and removal cycles, the wear depth of the sealing surface is <0.1mm, and the elastic decay rate of the spring 16 is <5%. This structure avoids the tightening operation required by traditional threaded connections. In a test of continuously replacing 10 faucets 21, the switching time for a single sample was reduced to 1 / 5 of the original method.

[0033] In another embodiment, the inner walls of both the suction line 9 and the water injection line 10 are lined with a chemically inert material.

[0034] In the above embodiments, the chemically inert lining can be a polytetrafluoroethylene (PTFE) layer or a perfluoroalkoxy resin (PFA) layer with a thickness of 0.3-0.6 mm. The inert lining provides excellent chemical corrosion resistance, ensuring that the pipeline remains intact after long-term contact with corrosive test solutions, and preventing contamination of the test solution or blockage of flow control valves by corrosion products from the pipe wall.

[0035] In another embodiment, the suction pipeline 9 between the vacuum pump 5 and the temporary storage tank 6 is equipped with an anti-backflow valve, and the outlet of the vacuum pump 5 is connected to the waste gas treatment container.

[0036] In the above embodiment, the anti-backflow valve is a one-way valve and is installed at the end of the suction line 9 near the vacuum pump 5. When the vacuum pump stops working, the anti-backflow valve can automatically block the reverse flow of liquid or vapor from the storage tank to the pump chamber, effectively protecting the precision components inside the vacuum pump from corrosion by the corrosive test liquid and preventing equipment damage and safety risks caused by liquid leakage. The waste gas treatment container is filled with activated carbon or a neutralizing agent, which can adsorb or neutralize acidic vapors or volatile substances that may be emitted during the suction process, preventing them from being directly discharged and polluting the laboratory environment, and improving operational safety.

[0037] In another embodiment, the top of the material tank 4 is provided with a top cover with a sealing structure, which integrates a suction pipe 9 insertion interface and an inert gas injection interface.

[0038] In the above embodiments, the sealed top cover effectively isolates external air and dust from contact with the test liquid inside the container, reducing the risk of introducing heavy metal particles from the air and helping to maintain the stability of the test liquid composition. The suction line insertion interface allows the suction line to be inserted and extended below the liquid surface for suction. The inert gas injection interface allows the introduction of inert gases such as nitrogen into the container before testing to expel dissolved oxygen or maintain an inert atmosphere, preventing certain metal ions (such as lead and cadmium) from affecting the accuracy of their release behavior measurement due to changes in their oxidation state.

[0039] In another embodiment, the temporary storage tank 6 is made of a transparent and corrosion-resistant material, and the outer wall of the temporary storage tank 6 is marked with volume scale markings, and an air-filtered pressure balancer is installed on the top.

[0040] In the above embodiments, the temporary storage tank 6 can be made of glass or other transparent polymers. Volume markings are provided on the outer wall of the temporary storage tank 6, allowing operators to directly and clearly observe changes in liquid volume and level within the tank. This facilitates real-time monitoring of the water injection progress, estimation of remaining time, and rapid detection of potential leaks. An air-filtered pressure balancer containing a hydrophobic microporous membrane is installed on the top of the temporary storage tank 6. This air-filtered pressure balancer allows air to enter the tank when the liquid level drops due to gravity injection, balancing the pressure and ensuring a stable water injection flow rate unimpeded by negative pressure. Simultaneously, it effectively prevents particulate matter and microorganisms from entering the tank, protecting the cleanliness of the test solution.

[0041] In another embodiment, the flow control valve 12 is a controlled proportional valve, the three-way valve 8 is a solenoid three-way valve, and both the flow control valve 12 and the three-way valve 8 are connected to the controller of the water injection device.

[0042] In the above embodiments, the flow control valve is a controlled proportional valve, and the three-way valve is an electromagnetic three-way valve, both connected to the device controller, realizing automated and precise control of the water injection process. The controlled proportional valve can accurately and continuously adjust the flow rate of the water injection pipeline according to the controller's instructions, meeting the stringent requirements of different testing standards for specific low flow rates (such as simulating actual usage conditions). The electromagnetic three-way valve is quickly and accurately switched between the water injection channel and the waste discharge channel by the controller according to a preset program or instructions, eliminating the time delay or switching errors that may be caused by manual valve operation, ensuring that the timing of water injection start-up, stop, and waste discharge is highly consistent in each test cycle, and improving the repeatability and standardization of the testing process.

[0043] In another embodiment, the base 7 is provided with a universal wheel 20 with brakes at each of its four bottom corners.

[0044] In the above embodiment, casters with brakes are installed at the four corners of the support frame base, greatly enhancing the mobility and deployment flexibility of the entire testing device. Operators can easily move the device to different locations in the laboratory, such as water tap testing stations or near water or power sources, adapting to various spatial layout requirements. Once the device reaches the designated position, depressing the brakes on the casters securely locks it in place, preventing movement or shaking during testing due to slight unevenness of the ground or accidental contact, ensuring stable and reliable measurement data and uniform mixing effect.

[0045] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of the water injection device for detecting total metal release from the inner wall of a faucet according to this utility model will be readily apparent to those skilled in the art.

[0046] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A water injection device for detecting total metal release from the inner wall of a faucet, characterized by, include: The system comprises a support frame, an electronic scale, a magnetic stirrer, a material bucket, a vacuum pump, a temporary storage tank, and a piping system. The electronic scale is placed on the base of the support frame, the magnetic stirrer is fixedly mounted on the weighing platform of the electronic scale, and the material bucket is placed in the stirring area of ​​the magnetic stirrer. The temporary storage tank is fixedly installed on the top of the support frame, and a three-way valve is provided at its bottom outlet. The piping system includes a suction pipe, a water injection pipe, and a wastewater pipe. One end of the suction pipe connects to the bottom of the material bucket, and the other end connects to the top of the temporary storage tank. The vacuum pump is connected in series to the suction pipe. One end of the water injection pipe connects to the first outlet of the three-way valve, and the other end connects to the inlet of the faucet to be tested. A flow control valve is provided on the water injection pipe. One end of the wastewater pipe connects to the second outlet of the three-way valve, and the other end connects to a waste liquid treatment container. The installation height of the temporary storage tank creates a gravity-driven liquid level difference between its bottom outlet and the inlet of the faucet to be tested.

2. The water injection device of claim 1, wherein The water inlet pipe is connected to the faucet via a quick-sealing connector, which includes an interface and a socket. The interface includes a valve body, the rear end of which is detachably connected to the water inlet pipe. An elastic seal is located within the cavity of the valve body, and a spring is fixed between the rear end of the elastic seal and the bottom wall of the valve body. The front end of the elastic seal has a conical sealing surface. The front end of the valve body has a valve port, the inner wall of which has a conical surface that matches the conical sealing surface. The socket includes a top tube, which is detachably connected to the faucet. The side wall of the top tube away from the faucet has multiple through holes spaced apart. The top tube is designed to extend into the valve port and push the elastic seal backward, causing the conical sealing surface to separate from the conical surface of the valve port, thus opening the flow channel.

3. The water injection device of claim 2, wherein The outer wall of the top pipe is provided with a limiting protrusion ring, which is located below the plurality of through holes, and the outer diameter of the limiting protrusion ring is larger than the outer diameter of the valve port.

4. The water injection apparatus of claim 1, wherein The inner walls of both the suction pipe and the water injection pipe are lined with chemically inert materials.

5. The water injection device according to claim 1, characterized in that, The suction pipeline between the vacuum pump and the temporary storage tank is equipped with an anti-backflow valve, and the vacuum pump outlet is connected to the waste gas treatment container.

6. The water injection device according to claim 1, characterized in that, The top of the material hopper is equipped with a top cover with a sealing structure, which integrates a suction pipe insertion interface and an inert gas injection interface.

7. The water injection device according to claim 1, characterized in that, The temporary storage tank is made of transparent and corrosion-resistant material. The outer wall of the temporary storage tank is marked with volume scale, and an air-filtered pressure balancer is installed on the top.

8. The water injection device according to claim 1, characterized in that, The flow control valve is a controlled proportional valve, and the three-way valve is a solenoid three-way valve. Both the flow control valve and the three-way valve are connected to the controller of the water injection device.

9. The water injection device according to claim 1, characterized in that, The base has a caster wheel with brakes at each of its four bottom corners.

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