Anti-falling structure for flow limiting piece of water inlet valve and water inlet valve using anti-falling structure

Abstract

According to the anti-falling structure of the flow limiting piece of the water inlet valve, the flow limiting piece is arranged in a water outlet pipeline, a water outlet section of the flow limiting piece surrounds the periphery of the flow limiting piece in a hot melting mode to form an inward shrinkage section which abuts against the edge of a water outlet and is subjected to thermal deformation and a fixed section far away from the edge of the water outlet, and the pipeline inner diameter of the fixed section is defined as the basic inner diameter D1; the inner diameter of the pipeline at the joint of the inward contraction section and the fixed section is equal to the inner diameter of the foundation, and D1 is equal to 8.0 mm + / -2.0 mm; the inner shrinkage section is provided with an inner shrinkage ring close to the edge of the water outlet, the inner shrinkage ring has the minimum inner diameter of an inner shrinkage section pipeline, the minimum inner diameter is defined as D2, the inner shrinkage amount of the inner shrinkage section is defined as dr = (D1-D2) / 2, and dr = 0.3-1.5 mm; and the length L of the inward contraction section in the water flow direction is 3-7mm. The inward shrinkage section is formed by hot melting of the water outlet section, the inward shrinkage section gradually shrinks inwards in the radial direction in the water flow direction, the water outlet pipeline of the water inlet valve can keep the original appearance and structure basically unchanged, and the flow limiting piece in the water outlet pipeline can be reliably fixed without arranging parts such as a plug. And the water pipe can bear high water pressure impact force of more than 300N and cannot be separated from the water outlet pipe.

Description

Technical Field

[0001] This utility model relates to a structure for preventing the flow limiting component of a water inlet valve from falling off, and a water inlet valve. Background Technology

[0002] With the development of household appliances such as dishwashers and washing machines, it is necessary to integrate pilot-operated electromagnetic inlet valves with multiple water outlet channels. In some of these channels, the water flow rate needs to be limited to a relatively small range (e.g., 0.25–2.5 L / min). However, placing a flow-limiting component in the inlet channel would significantly reduce the water pressure when the pilot valve is open, thus reducing the reliability of the pilot valve's closure. Therefore, it is considered to insert a small flow-limiting component into the outlet channel to limit the flow rate. Existing technology considers two installation methods for this small flow-limiting component: one is an interference fit between the small flow-limiting component and the outlet pipe; the other is to set a rib along the circumferential wall of the outlet pipe to limit the small flow-limiting component. However, both installation methods may not be able to prevent the impact of extremely high water pressure, which could cause the small flow-limiting component to be pushed out of the outlet, thus losing its flow-limiting function.

[0003] Chinese invention patent application number 202310159041.4 discloses a device to prevent the flow-limiting column of a water inlet valve from falling off. This device involves inserting a flow-limiting component inside the outlet channel of the water inlet valve, and then welding a plug to seal the component, preventing it from falling off. However, this invention requires a plug, increasing both the manufacturing process and cost. Therefore, there is a need for improvement.

[0004] For terms and knowledge, unless otherwise specified in this manual, please refer to the "IEC Electrical and Electronic Standards Terminology Dictionary" (China Standards Press, 1st edition, 1992), "Electrical Manufacturing Technology" (Mechanical Industry Press, 1st edition, 1982), "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" (Mechanical Industry Press, 1st edition, 1978 and 2nd edition, 1997), and QB / T 1291 "Inlet Solenoid Valve for Automatic Washing Machines". Utility Model Content

[0005] In order to solve the technical problem that the flow limiting component of the water inlet valve of household appliances is prone to falling off or that the number of parts is increased, as described in the background art, this utility model provides a structure that reliably prevents the flow limiting component in the water outlet channel of the water inlet valve from falling off.

[0006] The technical solution of this utility model is:

[0007] A structure for preventing the flow restrictor of a water inlet valve from falling off is provided. The flow restrictor is built into the outlet pipe of the water inlet valve. The outlet pipe includes an outlet section, which is formed by hot melting around its outer periphery into an inwardly recessed section that is close to the edge of the outlet and deformed by heat, and a fixed section that is far away from the edge of the outlet. The inwardly recessed section gradually shrinks radially inward along the direction of water flow.

[0008] The inner diameter of the pipe in the fixed section is defined as the basic inner diameter D1. The inner diameter of the pipe at the connection between the recessed section and the fixed section is equal to the basic inner diameter D1, both being D1 = 8.0 mm ± 2.0 mm.

[0009] The constricted section has a constricted ring near the edge of the outlet, which has the minimum inner diameter of the constricted section pipe, defined as D2. The constriction amount of the constricted section is defined as dr = (D1 - D2) / 2, where dr = 0.3 ~ 1.5 mm.

[0010] The length L of the constricted section along the water flow direction is 3 to 7 mm.

[0011] By forming an inward-shrinking section through the hot-melt outlet section, the inward-shrinking section gradually shrinks inward radially along the water flow direction. The outlet pipe of the inlet valve can maintain its original shape and structure basically unchanged, and there is no need to install plugs or other parts. The flow limiting component in the outlet pipe can be reliably fixed. Moreover, experiments show that the flow limiting component can withstand a high water pressure impact of more than 300N without detaching from the outlet pipe.

[0012] A further design feature is that the flow restrictor is partially or entirely embedded within the fixed section, and the maximum gap between the outer periphery of the flow restrictor and the fixed section pipe is no more than 0.1mm. This can prevent the flow restrictor from having an excessively large gap with the fixed section pipe, which would create a high-speed narrow slit water flow and produce a whistling sound.

[0013] This utility model also discloses a water inlet valve, which includes the above-mentioned anti-detachment structure for the water inlet valve flow limiting element. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the anti-detachment structure of the inlet valve flow limiting component of this utility model;

[0015] Figure 2 This is a three-dimensional schematic diagram of the water inlet valve of this utility model.

[0016] Figure label:

[0017] 1. Water outlet pipe, 2. Water outlet edge, 3. Water outlet section, 4. Inner section, 5. Fixed section, 6. Inner ring, 7. Flow limiting component. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of the embodiments.

[0019] like Figure 1As shown, the present invention provides a structure for preventing the flow restrictor of the inlet valve from falling off, which includes an outlet pipe 1 and a flow restrictor 7. The outlet pipe 1 includes an outlet section 3. First, the flow restrictor 7 is inserted into the outlet pipe 1 through the outlet edge 2. Then, the outlet section 3 is heat-melted and deformed around its outer periphery to form an inwardly retracted section 4 that is close to the outlet edge 2 and heat-deformed, and a fixed section 5 that is away from the outlet edge 2. The inwardly retracted section 4 gradually shrinks radially inward along the water flow direction.

[0020] The inner diameter of the pipe in the fixed section 5 is defined as the basic inner diameter D1. The inner diameter of the pipe at the connection between the inward section 4 and the fixed section 5 is equal to the basic inner diameter D1, both being D1 = 8.0 mm ± 2.0 mm.

[0021] The inner shrinkage section 4 has an inner shrinkage ring 6 near the outlet edge 2, which has the minimum inner diameter of the inner shrinkage section 4 pipe, defined as D2. The shrinkage amount of the inner shrinkage section 4 is defined as dr = (D1 - D2) / 2, dr = 0.3 ~ 1.5 mm.

[0022] The length L of the inward-curving section 4 along the water flow direction is 3 to 7 mm.

[0023] When the flow restrictor 7 is processed inside the water outlet pipe 1:

[0024] —Before hot melting, push the flow restrictor 7 inward toward the depth of the water outlet pipe 1;

[0025] —During heat fusion, the degree of inward deformation of the outlet pipe 1 is greatest at the outlet edge 2, and the degree of deformation gradually decreases along the depth of the pipe against the direction of water flow. Especially at the transition between the inward shrinkage section 4 and the fixed section 5, the deformation is gentle until it disappears at the fixed section 5. Since the heat of heat fusion is transferred from the outer wall of the pipe to the inside, the inner wall deforms less than the outer wall. The inner wall where the inner diameter begins to shrink is regarded as the connection point between the inward shrinkage section 4 and the fixed section 5. The depth length from this connection point to the outlet edge 2, that is, the length L of the inward shrinkage section 4 along the direction of water flow, is controlled to be 3 to 7 mm.

[0026] —After heat fusion, the impact force of the water flow when the inlet valve is opened will push the flow restrictor 7 outward to the connection between the fixed section 5 and the inner section 4, where the flow restrictor 7 will be stuck.

[0027] The outlet section 3 is heat-fused to form an inner constriction section 4, which gradually narrows radially inward along the water flow direction, forming an inner frustum or frustum of a ball. Therefore, the outlet pipe 1 of the inlet valve can maintain its original shape and structure without the need for plugs or other parts, thus reliably fixing the flow restrictor 7 inside the outlet pipe 1. At most, the flow restrictor 7 is partially squeezed into the inner constriction section 4. Experiments have shown that the flow restrictor can withstand a high water pressure impact of over 300N without detaching from the outlet pipe 1.

[0028] Furthermore, the flow restrictor 7 is partially or entirely embedded in the fixed section 5, and the maximum gap between the outer periphery of the flow restrictor 7 and the pipe of the fixed section 5 is no more than 0.1mm, which can prevent the gap between the outer periphery of the flow restrictor 7 and the pipe of the fixed section 5 from being too large, thus avoiding the formation of a high-speed narrow slit water flow that produces a whistling sound.

[0029] like Figure 2 As shown, this utility model also discloses a water inlet valve, which includes the above-mentioned anti-detachment structure for the water inlet valve flow limiting component. The water outlet pipe of this water inlet valve can maintain its original shape and structure, and does not require the installation of plugs or other parts. It can reliably fix the flow limiting component in the water outlet pipe and can withstand the impact force of high water pressure of more than 300N without detaching from the water outlet pipe.

[0030] The aforementioned anti-detachment structure for the inlet valve flow restrictor can be applied not only to some or all of the outlet channels of inlet valves with multiple outlet channels, but also to inlet valves with a single outlet channel.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technical solution, concept, or design obtained by those skilled in the art by making equivalent substitutions or changes based on the technical solution and inventive concept of the present utility model within the technical scope disclosed in the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A structure for preventing the flow restrictor of a water inlet valve from falling off, wherein the flow restrictor (7) is built into the outlet pipe (1) of the water inlet valve, characterized in that: The water outlet pipe (1) includes an outlet section (3), which is formed by hot melting around its outer periphery into an inwardly recessed section (4) that is close to the outlet edge (2) and deformed by heat, and a fixed section (5) that is far away from the outlet edge (2). The inwardly recessed section gradually shrinks radially inward along the water flow direction. The inner diameter of the pipe in the fixed section (5) is defined as the basic inner diameter D1. The inner diameter of the pipe at the connection between the inward section (4) and the fixed section (5) is equal to the basic inner diameter D1, both being D1 = 8.0 mm ± 2.0 mm. The inner section (4) has an inner ring (6) near the edge (2) of the outlet, which has the minimum inner diameter of the inner section (4) pipe, which is defined as D2. The inner shrinkage amount of the inner section (4) is defined as dr=(D1-D2) / 2, dr=0.3~1.5mm; The length L of the inner section (4) along the water flow direction is 3 to 7 mm.

2. The anti-detachment structure for the inlet valve flow restrictor according to claim 1, characterized in that: The inward section (4) is presented as an inner circular table or a spherical table.

3. The anti-detachment structure for the inlet valve flow restrictor according to claim 1, characterized in that: The flow restrictor (7) is partially or entirely embedded in the fixed section (5), and the maximum gap between the outer periphery of the flow restrictor (7) and the pipe of the fixed section (5) is no greater than 0.1 mm.

4. A water inlet valve, characterized in that: The inlet valve flow restrictor anti-detachment structure includes any one of the claims 1-3 above.

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