Water flow sensor with jet device

Abstract

The water flow sensor comprises a shell, a water outlet pipe, a water inlet pipe, an impeller, a magnet and a magnetic sensor, and the shell is connected with the water outlet pipe and the water inlet pipe; the impeller is provided with a magnet and is arranged in the inner cavity of the shell; the magnetic sensor is arranged outside the shell and is close to the position of the magnet, a convex tooth and a jet device are arranged in an inner cavity of the water inlet pipe, the jet device is made of an elastic material and comprises a convex edge, a barrel and a jet head which are sequentially connected end to end, the convex edge and the barrel are of a hollow barrel type structure, the convex edge is provided with a water inlet, and the jet head is provided with a water outlet. The jet flow head is of a hollow cylinder type structure with one closed end, and the nozzle is arranged at the closed end of the jet flow head and provided with a flat opening. The position of the jet device in the water inlet pipe is limited and fixed by the convex teeth; when no water flow passes, the nozzle is closed; when small water flow passes, the flat opening of the nozzle is slightly opened to obtain jet flow to drive the impeller to rotate; when large water flow passes, the flat opening of the nozzle is completely opened. According to the utility model, the threshold value of the starting impeller of lower water flow is obtained through jet flow, so as to obtain the best matching starting water flow threshold value effect.

Description

Technical Field

[0001] The utility model relates to a water flow sensor with an ejector. Background Art

[0002] Typically, a 2L / min high-throughput flow sensor only has a minimum activation flow of 200ml / min. Therefore, it may not activate properly at lower flows, such as 50ml / min. Using a 100ml / min low-throughput flow sensor in applications requiring a high 2L / min flow rate will result in pressure loss and reduced flow rate, failing to meet back-end requirements. For example, a dental chair water line sterilizer requires a flow rate of approximately 2000mL / min, while a three-way handpiece or high-speed handpiece requires a flow rate of around 120ml / min. Some dental chair brands even require extremely low flow rates of 50-80ml / min for optimal patient experience. Conventional flow sensors struggle to meet these disparate conditions. They either experience significant pressure loss and reduced flow rate, or fail to activate the dental chair water line sterilizer when using a three-way handpiece or high-speed handpiece, potentially introducing waterborne pathogens into the patient's mouth (currently, the pass rate for dental chair water lines without a professional water line sterilizer is extremely low), leading to the risk of wound infection. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, according to an embodiment of the present invention, a water flow sensor with an ejector is provided to solve the problem of extremely low starting water flow while taking into account the demand for large-flux water use. An ejector made of elastic material is arranged at the front end of the impeller of the large-flux water flow sensor, and the ejector has a flat opening; when there is no water flow, the elastic opening is closed, and when the water flow is small, the micro-opening obtains a jet to drive the impeller to start and measure; when the water flow is large, the flat opening is fully opened to ensure the large-flux requirement.

[0004] According to an embodiment, the utility model provides a water flow sensor with an ejector, comprising a housing, a water outlet pipe, a water inlet pipe, an impeller, a magnet, and a magnetic sensor. The housing is connected to the water outlet pipe and the water inlet pipe; the impeller is provided with a magnet and is disposed in the inner cavity of the housing; the magnetic sensor is disposed outside the housing, close to the position of the magnet; the inner cavity of the water inlet pipe is provided with a protruding tooth and an ejector, and the ejector is made of an elastic material, wherein:

[0005] The ejector comprises a convex edge, a cylinder and a jet head connected end to end in sequence, the convex edge and the cylinder are hollow cylindrical structures, the convex edge is provided with a water inlet, the jet head is a hollow cylindrical structure with one end closed, and the nozzle is provided at the closed end of the jet head and is provided with a flat opening;

[0006] The aforementioned convex teeth limit and fix the position of the ejector in the water inlet pipe; when there is no water flow, the nozzle is closed; when a small water flow passes through, the flat opening of the nozzle opens slightly to obtain a jet and drive the impeller to rotate; when a large water flow passes through, the flat opening of the nozzle opens completely.

[0007] Preferably, the elastic material of the ejector is any one of rubber, nitrile rubber, silicone rubber, fluororubber (FKM), ethylene propylene diene monomer (EPDM), and hydrogenated nitrile butadiene rubber (HNBR).

[0008] Preferably, the ejector is provided with a support ring to prevent the ejector from deformation.

[0009] Preferably, the ejector is provided with an adjusting ring to adjust the distance between the ejector and the impeller.

[0010] Preferably, the ejector can change the length of the flat opening of the nozzle according to the starting requirements and the measurement accuracy requirements.

[0011] Preferably, the magnetic sensor is a Hall sensor or a reed switch.

[0012] Compared with the existing technology, the beneficial results of the present invention are: the threshold for starting the impeller with a lower water flow is obtained by jetting, and even an extremely low water flow of 20ml / min can drive the water flow sensor. At large flow rates, the flat opening of the nozzle made of elastic material is fully opened without affecting the flux and pressure loss, and the nozzle parameters can be adjusted to obtain the best matching effect of the starting water flow threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structural principle of the utility model;

[0014] Figure 2 This is the structural diagram of the ejector of the utility model.

[0015] Figure 3 This is one of the 0° cross-sectional views of the ejector of the present invention.

[0016] Figure 4 This is the second 90° cross-sectional view of the ejector of the present invention.

[0017] Figure 5 This is the third cross-sectional view of the ejector of the present utility model.

[0018] 1 is the water flow sensor; 2 is the housing; 3 is the outlet pipe; 4 is the inlet pipe; 5 is the impeller; 6 is the magnet; 7 is the magnetic sensor; 8 is the protruding teeth; 9 is the ejector; 901 is the ridge; 902 is the barrel; 903 is the ejector head; 904 is the ejector inlet; 905 is the nozzle; 906 is the support ring; 907 is the adjustment ring. DETAILED DESCRIPTION

[0019] The present invention is further described below with reference to the accompanying drawings and specific embodiments. These embodiments should be understood as merely illustrative of the present invention and not intended to limit the scope of protection of the present invention. After reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and such equivalent changes and modifications also fall within the scope defined by the claims of the present invention.

[0020] Example 1

[0021] like Figure 1 、 2 As shown, the first preferred embodiment of the utility model provides a water flow sensor 1 with an ejector, including a shell 2, a water outlet pipe 3, a water inlet pipe 4, an impeller 5, a magnet 6, a magnetic sensor 7, a convex tooth 8 and an ejector 9, wherein: the shell 2 is connected to the water outlet pipe 3 and the water inlet pipe 4, the inner diameter of the water outlet pipe 3 and the water inlet pipe 4 is 6mm, and the water flow is 0.01-3L / min; the impeller 5 is provided with six magnets 6, which are placed in the inner cavity of the shell 2; the magnetic sensor 7 is placed outside the shell 2, close to the magnet 6; the inner cavity of the water inlet pipe 4 is provided with a convex tooth 8 with a width of 4mm and a height of 0.5mm; the magnetic sensor 7 is a Hall magnetic sensor. The ejector 9 is formed by silicone curing and demolding, and is composed of a convex edge 901, a cylinder 902 and a jet head 903 connected end to end. The convex edge 901 and the cylinder 902 are hollow cylindrical structures. The convex edge 901 is provided with a water inlet 904. The jet head 903 is a hollow cylindrical structure with one end closed. The nozzle 905 is provided at the closed end of the jet head 903 and is provided with a flat opening. Figure 3 / Figure 4 As shown, the ridge 901, barrel 902, jet 903, and nozzle 905 are integrally formed using silicone curing and demolding. The protruding teeth 8 position the ridge 901, thereby securing the ejector 9. Adjusting the length of barrel 902 adjusts the distance between the nozzle 905 and the impeller 5.

[0022] The ejector 9 is built into the water inlet pipe 4. The ejector 9 has an outer diameter of 5.95 mm, an inner diameter of 3 mm, and a length of 10 mm;

[0023] The outer diameter of the cylinder 902 is 4.5 mm, the inner diameter is 2.5 mm, and the opening length of the flat opening of the nozzle 905 is 2.5 mm.

[0024] like Figure 3-4 As shown, when there is no water flow, the nozzle 905 opening is in a closed state, and the flat opening of the nozzle 905 is in a slightly open state when the flow rate is less than 200 ml / min. It can be perfectly started at 50 ml / min, and the 2 L / min flux is attenuated to 85% of the original, which does not affect the use of large water flow.

[0025] Example 2

[0026] like Figure 1-2As shown, the second preferred embodiment of the present invention provides a water flow sensor 1 with an ejector, comprising a housing 2, an outlet pipe 3, an inlet pipe 4, an impeller 5, a magnet 6, a magnetic sensor 7, a protruding tooth 8, and an ejector 9. The housing 2 connects the outlet pipe 3 and the inlet pipe 4, each having an inner diameter of 6 mm and a water flow rate of 0.01-3 L / min. The impeller 5 is provided with six magnets 6, positioned within the inner cavity of the housing 2. The magnetic sensor 7 is positioned outside the housing 2, close to the magnets 6. The inner cavity of the inlet pipe 4 is provided with a protruding tooth 8 measuring 4 mm wide by 0.9 mm high, and is integrally formed with the inlet pipe 4. The magnetic sensor 7 is a Hall effect magnetic sensor. The ejector 9 is made of elastic EPDM rubber and is built into the inlet pipe 4. The ejector 9 has an outer diameter of 5.95 mm, an inner diameter of 3 mm, and a length of 10 mm. The barrel 902 has an outer diameter of 4 mm and an inner diameter of 2 mm, and the flat opening of the nozzle 905 has an opening length of 2 mm. In addition, in this embodiment, the structure of the ejector 9 is the same as that of embodiment 1 and will not be described again.

[0027] like Figure 3-4 As shown, when there is no water flow, the flat opening of the nozzle 905 is in a closed state, and when the flow rate is less than 200 ml / min, the flat opening of the nozzle 905 is in a slightly open state. It can be started accurately and stably at 50 ml / min, and the impeller can be started at 20 mil / min (about 3 drops of water in 2 seconds). The flux of 3 L / min is attenuated to 85% of the original, which is perfect.

[0028] like Figure 5 As shown, in this embodiment, the ejector 9 is provided with a support ring 906 with an outer diameter of 3.1 mm, an inner diameter of 2.2 mm, and a length of 4 mm to prevent the ejector from deformation; in addition, the ejector 9 is also provided with an adjustment ring 907 with an outer diameter of 5.95 mm, an inner diameter of 4.2 mm, and a length of 2 mm. By adding the adjustment ring 907, the distance between the impeller 5 and the nozzle 905 is adjusted by 1 mm. At the same time, the adjustment ring 907 also has the function of strengthening the strength of the elastic material ejector 9.

[0029] The shape and structure of the water flow sensor illustrated in the illustrations of this utility model merely illustrate the conceptual principle of the ejector's elastic nozzle 905, which varies in diameter to produce a jet flow, thereby activating the impeller during low-flow conditions. The illustrated shape and structure of the water flow sensor do not limit the rights of this utility model. Modifications to the shape, structure, or direction of the water flow outlet, such as changing the flat opening of the nozzle 905 to a U-, W-, or plum-shaped elastic opening, made under the concepts of this utility model, shall be considered within the scope of the claims of this utility model, which claim that the elastic ejector's diameter is reduced to achieve a smaller impeller-activating water flow threshold.

Claims

1. A water flow sensor with an ejector, comprising a housing (2), a water outlet pipe (3), a water inlet pipe (4), an impeller (5), a magnet (6) and a magnetic sensor (7), wherein the housing (2) is connected to the water outlet pipe (3) and the water inlet pipe (4); the impeller (5) is provided with a magnet (6) and is arranged in the inner cavity of the housing (2); the magnetic sensor (7) is arranged outside the housing (2) and close to the magnet (6), and is characterized in that: The inner cavity of the water inlet pipe (4) is provided with a convex tooth (8) and an ejector (9), and the ejector (9) is made of elastic material, wherein The ejector (9) comprises a convex edge (901), a cylinder (902) and a jet head (903) connected end to end in sequence, the convex edge (901) and the cylinder (902) are hollow cylindrical structures, the convex edge (901) is provided with a water inlet (904), the jet head (903) is a hollow cylindrical structure with one end closed, and the nozzle (905) is provided at the closed end of the jet head (903) and is provided with a flat opening; The aforementioned protruding teeth (8) limit and fix the position of the ejector (9) in the water inlet pipe (4); when no water flows through, the nozzle (905) is closed; when a small water flow passes through, the flat opening of the nozzle (905) is slightly opened to obtain a jet and drive the impeller (5) to rotate; when a large water flow passes through, the flat opening of the nozzle (905) is fully opened.

2. The water flow sensor according to claim 1, wherein: The material of the ejector (9) is selected from rubber, nitrile rubber, silicone rubber, fluororubber FKM, EPDM and hydrogenated nitrile butadiene rubber HNBR.

3. The water flow sensor according to claim 1, wherein: The ejector (9) is provided with a support ring (906) to prevent the ejector (9) from being deformed.

4. The water flow sensor according to claim 1, wherein: The ejector (9) is provided with an adjustment ring (907) to adjust the distance between the ejector (9) and the impeller (5).

5. The water flow sensor according to claim 1, wherein: The ejector (9) can change the flat opening length of the nozzle (905) according to the starting requirements and the measurement accuracy requirements.

6. The water flow sensor according to claim 1, wherein: The magnetic sensor (7) is a Hall sensor or a reed switch.

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