Water flow sensor

Abstract

The utility model relates to the technical field of water flow detection, and particularly discloses a water flow sensor which comprises a flow guide pipe, a Hall element arranged on the flow guide pipe and a water flow rotor assembly rotationally connected in the flow guide pipe, and a flow blocking structure is further arranged in the position, behind the water flow rotor assembly, of the flow guide pipe in the water flow inflow direction. The flow choking structure comprises a flow choking block coaxially arranged in the flow guide pipe and capable of sliding, a bottom inclined ring groove formed in the bottom end of the flow choking block and an inclined table arranged in the flow guide pipe and attached to the bottom inclined ring groove, and the outer diameter of the flow choking block is smaller than the inner diameter of the flow guide hole. And at the moment when hot water is started, the impact force of water flow may push the water flow rotor to rotate to trigger a water flow speed threshold value set in the controller.

Description

Technical Field

[0001] The present application relates to the technical field of water flow detection, and specifically discloses a water flow sensor. Background Art

[0002] The water flow sensor is mainly composed of a copper valve body, a water flow rotor assembly, a flow stabilization assembly and a Hall element. It is installed at the water inlet of the water heater to measure the water inlet flow. When the water flows through the rotor assembly, the magnetic rotor rotates, and the speed changes linearly with the flow rate. The Hall element outputs the corresponding pulse signal and feeds it back to the controller, which determines the size of the water flow and adjusts the current of the proportional valve to control the gas volume through the proportional valve.

[0003] However, in order to ensure that the conventional water flow sensor has a low starting flow rate, usually only one set of water flow rotor components is arranged inside, and the water flow rotor components will rotate after being impacted by the water flow.

[0004] In the daily use of the water heater, for the hot and cold water taps in the wash basin or sink, it is often the case that the hot water switch is accidentally touched when the user wants to use cold water. At the moment when the hot water is turned on, water will flow into the water inlet of the water heater and impact the water flow rotor assembly in the water flow sensor. The water flow rotor assembly will rotate and the Hall element will send a signal to the controller. Although, in the prior art, a starting water pressure threshold and a starting water flow threshold are set in the controller, at the moment when the water flows into and impacts the water flow rotor assembly, its impact force may be greater than the threshold set in the controller and trigger the controller's command to start the heating mode of the water heater.

[0005] Therefore, in view of this, the inventor provides a water flow sensor to solve the above problems. Utility Model Content

[0006] The utility model aims to solve the problem that in a water flow sensor installed in a traditional water heater, at the moment of turning on the hot water, the impact force of the water flow may drive the water flow rotor to rotate and trigger the water flow rate threshold set in the controller.

[0007] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a water flow sensor, including a guide tube, a Hall element arranged on the guide tube and a water flow rotor assembly rotatably connected in the guide tube, and a flow blocking structure is also arranged in the guide tube behind the water flow rotor assembly along the water flow inflow direction, the flow blocking structure includes a flow blocking block coaxially arranged in the guide tube and slidable, a bottom inclined annular groove opened at the bottom end of the flow blocking block, and a ramp arranged in the guide tube and fitted with the bottom inclined annular groove, and the outer diameter of the flow blocking block is smaller than the inner diameter of the guide hole.

[0008] Furthermore, the length of the inclined platform is greater than the length of the bottom inclined annular groove.

[0009] Furthermore, the flow-blocking structure also includes a guide rod coaxially arranged in the flow-conducting tube and a plurality of connecting rods fixedly connected between the guide rod and the inner wall of the flow-conducting tube. The top of the flow-blocking block is provided with a sliding hole for the guide rod to extend into and slide inside.

[0010] Furthermore, a limiting sliding groove is provided inside the sliding hole, and a limiting sliding block slidably connected to the limiting sliding groove is provided at the bottom end of the guide rod.

[0011] Furthermore, a gap is left between the guide rod and the sliding hole for water to enter.

[0012] Furthermore, a top inclined annular groove is provided at the top of the baffle block.

[0013] Furthermore, the top inclined annular groove is arranged adjacent to the bottom inclined annular groove.

[0014] The principle and effect of this scheme are:

[0015] Compared with the prior art, the utility model further provides a flow-blocking structure in the flow-guiding pipe, so that the flow-blocking block of the flow-blocking structure plays a role in blocking and slowing down the flow velocity of the water when water flows in. Only when the water flows to lift up and stabilize the flow-blocking block can the water flow velocity be restored and stabilized. Therefore, when the hot water switch is turned on by mistake, the water flow in a short period of time will be blocked by the flow-blocking block and the flow velocity will be reduced, thereby slowing down the rotation speed that drives the water flow rotor assembly to rotate, so that it cannot reach the threshold value for turning on the heating condition. This solves the problem that in the water flow sensor installed in the traditional water heater, at the moment of turning on the hot water, the impact force of the water flow may drive the water flow rotor to rotate and trigger the water flow velocity threshold set in the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of a water flow sensor proposed in an embodiment of the present application is shown;

[0018] Figure 2 A cross-sectional view of a water flow sensor proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0020] The reference numerals in the drawings of the specification include: guide tube 1, connecting part 2, toggle ring 3, Hall element 4, connecting rod 5, guide rod 6, baffle block 7, inclined platform 8, rotating ring 9, blade 10, and magnetic rotor 11.

[0021] A water flow sensor, for example Figure 1 and Figure 2 As shown:

[0022] The invention comprises a flow guide tube 1 , a Hall element 4 installed on the flow guide tube 1 , a water flow rotor assembly installed on the flow guide tube 1 , and a flow blocking structure installed in the flow guide tube 1 .

[0023] The outer walls of both ends of the guide tube 1 are respectively provided with external threads to form a connecting portion 2, and a closed ring 3 is integrally formed on the guide tube 1 inside the connecting portion 2, and the outer wall of the ring 3 is provided with a plurality of grooves.

[0024] The inner wall of the flow guide tube 1 is provided with a closed annular groove at a height relative to the installation height of the Hall element 4. The water flow rotor assembly includes a rotating ring 9 installed in the annular groove and slidable in the annular groove, a magnetic rotor 11 coaxially installed inside the rotating ring 9, and a plurality of blades 10 circumferentially installed between the rotating ring 9 and the magnetic rotor 11. In this embodiment, the Hall element 4 used is a commonly used Hall element 4 in the prior art, and the installed water flow rotor assembly is also a commonly used water flow rotor assembly in the prior art.

[0025] like Figure 2 As shown, in this embodiment, a frustum is fixedly mounted on the bottom of the magnetic rotor 11 to further divide and guide the water flow to enter and impact the blades 10.

[0026] The flow-blocking structure is installed in the flow-guiding pipe 1 behind the water flow rotor assembly along the water flow inflow direction, that is, installed in the flow-guiding pipe 1 above the water flow rotor assembly. The flow-blocking structure includes a flow-blocking block 7 coaxially installed in the flow-guiding pipe 1 and slidable, a bottom inclined annular groove provided at the bottom end of the flow-blocking block 7, and a ramp 8 integrally formed in the flow-guiding pipe 1 and fitted with the bottom inclined annular groove, wherein the outer diameter of the flow-blocking block 7 is smaller than the inner diameter of the flow-guiding hole.

[0027] When the switch is not turned on, no water is supplied to the guide tube 1, the baffle block 7 will not fall due to the upward thrust, and the bottom inclined ring groove fits with the inclined platform 8 to support the baffle block 7, and the baffle block 7 closes the water flow channel formed by the inclined platform 8. When the switch is turned on, the water flows into the guide tube 1, but due to the existence of the baffle block 7, the water needs to lift the baffle block 7 to form a gap for the water flow to pass through, and the deadweight of the baffle block 7 itself can be used as a preset pressure for the water flow to open. When the water flow first contacts the baffle block 7 and is blocked by the baffle block 7, the flow rate of the water flow will be reduced until the baffle block 7 is stably lifted to have a stable flow rate. Therefore, when the switch is turned on for a short time, the force of the water flow impacting the blade 10 can be reduced, and the speed at which the blade 10 drives the rotor to rotate can be slowed down.

[0028] In this embodiment, the length of the inclined platform 8 is greater than the length of the bottom inclined annular groove to increase the width of the water flow gap that can be formed between the baffle block 7 and the guide hole. Furthermore, a top inclined annular groove adjacent to the bottom inclined annular groove is formed at the top of the baffle block 7.

[0029] The flow-blocking structure also includes a guide rod 6 coaxially installed in the flow-conducting tube 1 and four connecting rods 5 circumferentially fixedly installed between the knife rod and the inner wall of the flow-conducting tube 1. A sliding hole is provided at the top axis of the flow-blocking block 7 for the guide rod 6 to extend into and slide in. Two limiting slide grooves are also provided on the inner side of the slide hole. The bottom end of the guide rod 6 is integrally formed with two limiting sliders that can slide in the limiting slide grooves respectively, and a gap is formed between the guide rod 6 and the slide hole for water flow to enter. Through the cooperation of the limiting slider and the limiting slide groove, when the flow-blocking block 7 is moved upward by the thrust of the water flow, it can only slide in the axial direction and will not rotate, thereby reducing the disturbance of the water flow. At the same time, the water flow can enter the gap between the guide rod 6 and the slide hole, thereby increasing the resistance.

[0030] When the utility model is in use, the water flow drives the blades to rotate, driving the magnetic rotor to rotate. The rotation of the magnetic rotor cooperates with the Hall element, and the Hall element outputs a corresponding pulse signal and feeds back to an external controller. The internally arranged flow-blocking structure can slow down the flow of water at the initial stage of entering, preventing the hot water switch from being turned on by mistake, causing the water flow to drive the blades to rotate, and the blade speed exceeds the threshold set by the controller to start the heating mode of the water heater.

[0031] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A water flow sensor, comprising a flow guide tube, a Hall element arranged on the flow guide tube, and a water flow rotor assembly rotatably connected in the flow guide tube, characterized in that: A flow-blocking structure is also arranged in the guide pipe behind the water flow rotor assembly along the direction of water flow inflow. The flow-blocking structure includes a flow-blocking block coaxially arranged in the guide pipe and slidable, a bottom inclined annular groove opened at the bottom end of the flow-blocking block, and a ramp arranged in the guide pipe and fitted with the bottom inclined annular groove. The outer diameter of the flow-blocking block is smaller than the inner diameter of the guide hole.

2. A water flow sensor according to claim 1, characterized in that: The length of the inclined platform is greater than the length of the bottom inclined ring groove.

3. A water flow sensor according to claim 1, characterized in that: The flow blocking structure also includes a guide rod coaxially arranged in the flow guiding tube and a plurality of connecting rods fixedly connected between the guide rod and the inner wall of the flow guiding tube. The top of the flow blocking block is provided with a sliding hole for the guide rod to extend into and slide inside.

4. A water flow sensor according to claim 3, characterized in that: A limiting sliding groove is provided inside the sliding hole, and a limiting sliding block which is slidably connected with the limiting sliding groove is provided at the bottom end of the guide rod.

5. A water flow sensor according to claim 4, characterized in that: A gap is reserved between the guide rod and the sliding hole for water flow to enter.

6. A water flow sensor according to claim 1 or 2, characterized in that: The top of the baffle block is also provided with a top inclined annular groove.

7. A water flow sensor according to claim 6, characterized in that: The top inclined annular groove is arranged adjacent to the bottom inclined annular groove.

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