Electromagnetic water inlet valve capable of improving low-water-pressure starting performance

Abstract

An electromagnetic water inlet valve capable of improving low-water-pressure starting performance comprises a valve body, a coil assembly, a waterproof sleeve located in the center of the coil assembly, a movable iron core in an inner cavity of the waterproof sleeve, a sealing diaphragm between the waterproof sleeve and the valve body and a supporting frame rigidly supporting the sealing diaphragm, the diameter of the lower end of the movable iron core is enlarged to form a protruding part, and an elastic rubber plug is fixed to the protruding part. A blocking cover fixedly connected with the supporting frame is arranged on the periphery of the protruding part and is of a hollow tubular structure, a through hole is formed in the middle of the upper end of the blocking cover so that the movable iron core can move in the axial direction, the radial gap between the through hole and the movable iron core is not larger than 0.6 mm, and the movable iron core is controlled to move up and down and not prone to inclining. And when the water pressure is lower than 0.02 Mpa, after the coil is electrified to attract the movable iron core to move upwards to be far away from the conducting pilot hole, the protruding part of the movable iron core jacks up the blocking cover to drive the supporting frame and the sealing diaphragm to move upwards, the main valve is opened to discharge water normally, and the household appliance can be used normally.

Description

Technical Field

[0001] This utility model relates to an electromagnetic water inlet valve, and more particularly to an electromagnetic water inlet valve that improves the starting performance under low water pressure. The IPC classification may be F16K25 / 00 or F16K29 / 00. Background Technology

[0002] When a pilot-operated solenoid inlet valve for a household appliance is opened, it relies on the pressure difference between the supply chamber and the back pressure chamber to push up the valve diaphragm in order to open the main valve. When the tap water pressure is lower than 0.02MPa, the water pressure difference is insufficient to overcome the resistance between the valve diaphragm and the main valve seat, so the main valve cannot be opened or the opening degree is very small, resulting in a very low flow rate and the household appliance cannot be used normally.

[0003] For relevant terms and knowledge, unless otherwise specified in this manual, please refer to the following: *Low Voltage Electrical Appliance Design Manual* (1st edition, Machinery Industry Press, 1992), *Valve Manual - Selection* (1st edition, Chemical Industry Press, 2013), *IEC Electrical and Electronic Standards Terminology Dictionary* (1st edition, China Standards Press, 1992), *Electrical Manufacturing Technology* (1st edition, Machinery Industry Press, 1982), *Mechanical Engineering Handbook* and *Electrical Engineering Handbook* (1st edition, Machinery Industry Press, 1978 and 2nd edition, 1997), GB14536.9 *Special Requirements (including mechanical requirements) for Electric Water Valves for Household and Similar Electric Automatic Controllers*, GB / T21465-2008 *Valve Terminology*, QB / T 1291 *Solenoid Valve for Automatic Washing Machines*, CN213088786U *A Solenoid Valve for Improving Sealing Performance*, and CN202834236U *Solenoid Water Inlet Valve*. Utility Model Content

[0004] To address the technical problem described in the background art that the main valve of a pilot-operated electromagnetic inlet valve cannot be opened under low water pressure, this utility model provides an electromagnetic inlet valve that can be opened normally even under low water pressure.

[0005] The technical solution of this utility model is:

[0006] An electromagnetic water inlet valve for improving low water pressure start-up performance includes a valve body, a coil assembly, a water-isolating sleeve located at the center of the coil assembly, a movable iron core inside the water-isolating sleeve, a sealing diaphragm between the water-isolating sleeve and the valve body, and a support frame that rigidly supports the sealing diaphragm. The lower end of the movable iron core is enlarged to form a protrusion, and an elastic rubber plug is fixed to the protrusion. A baffle is provided on the outer periphery of the protrusion and is fixedly connected to the support frame. The baffle is a hollow tubular structure, and a through hole is opened in the middle of the upper end of the baffle for axial movement of the movable iron core. The radial gap between the through hole and the movable iron core is no more than 0.6 mm.

[0007] When the water pressure is below 0.02 MPa, the coil is energized and attracts the movable iron core to move upward away from the pilot hole. After moving upward, the protruding part of the movable iron core pushes up the baffle, which drives the support frame and the sealing diaphragm to move upward, opening the main valve and allowing normal water flow. Household appliances can be used normally. The guide gap of the through hole in the middle of the upper end of the baffle for the axial movement of the movable iron core is no more than 0.6 mm, which controls the up and down movement of the movable iron core to prevent it from tilting. This avoids the elastic rubber plug from tilting when sealing the pilot hole, causing unreliable sealing and leakage.

[0008] The typical design of this technical solution is as follows: the upper side of the support frame has an annular rim, the inner side of the rim has an annular groove, the outer periphery of the baffle has an annular protrusion, the annular protrusion and the annular groove are interlocked to fix the baffle and the support frame, and the outer wall of the baffle has a second through hole that penetrates through the outer wall to connect the internal space of the baffle and the back pressure chamber. The flow cross-sectional area of ​​the second through hole is larger than the flow cross-sectional area of ​​the pilot hole.

[0009] A second through hole with a flow cross-sectional area larger than the pilot hole is opened through the outer wall of the baffle to connect the internal space of the baffle with the back pressure chamber. This ensures that the pilot flow channel from the back pressure chamber to the outlet chamber has sufficient flow and reliable operation. At the same time, it avoids the through hole of the protective cover used for guiding the movable iron core from being too narrow as a flow channel, which would cause a whistling sound when the water supply pressure is high. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the first embodiment of the electromagnetic inlet valve for improving low water pressure start-up performance according to this utility model;

[0011] Figure 2 yes Figure 1 Enlarged view of region A in the middle;

[0012] Figure 3 yes Figure 2 The schematic diagram of the modified design corresponds to the second embodiment of this utility model;

[0013] Figure 4 yes Figure 3 The exploded cross-sectional view of the support frame, baffle and movable iron core in the second embodiment shown.

[0014] Figure label:

[0015] Valve body 1, water supply chamber 101, water outlet chamber 102, valve seat 103, back pressure chamber 104, sealing diaphragm 2, balance hole 202, support frame 3, pilot hole 302, annular rim 303, annular groove 304, second groove 305, water-proof sleeve 4, movable iron core 5, protrusion 501, elastic rubber plug 6, coil assembly 7, baffle 8, annular protrusion 801, second through hole 802, through hole 803. Detailed Implementation

[0016] This utility model only improves the connection structure between the support frame and the movable iron core of the rigid support sealing diaphragm in the existing pilot-operated electromagnetic water inlet valve of household appliances. The basic structure and working principle of the pilot-operated electromagnetic water inlet valve are common knowledge in the field and have been described in Chinese patent document CN213088786U. This utility model inherits the relevant structure and working principle therein, and will not repeat them in this specification.

[0017] The terms "center," "upper," "lower," "inner," and "outer" used in the text are based on Figure 1 The indicated orientation or positional relationship Figure 1 The centerline is the central axis of valve seat 103, i.e., the center, and the direction of this axis is the axial direction. The coil assembly is located above the valve body.

[0018] Figure 1-2 This invention illustrates a first embodiment of an electromagnetic water inlet valve for improving low water pressure start-up performance. The electromagnetic water inlet valve includes a valve body 1, a coil assembly 7 located on the upper side of the valve body 1, and a water-isolating sleeve 4 located at the center of the coil assembly 7. A valve seat 103, integrally formed with the valve body 1, divides the internal cavity of the valve body 1 into a water supply chamber 101 surrounding the outer periphery of the valve seat 103 and a water outlet chamber 102 surrounding the inner periphery of the valve seat 103. A sealing diaphragm 2 and a support frame 3 rigidly supporting the sealing diaphragm 2 are disposed between the water-isolating sleeve 4 and the valve seat 103. A back pressure chamber 104 is formed between the radially outwardly expanding lower part of the water-isolating sleeve 4 and the sealing diaphragm 2. A pilot hole 302 is opened in the center of the support frame 3. A balance hole 202 is opened beside the pilot hole 302 on the sealing diaphragm 2 or the support frame 3 to connect the back pressure chamber 104 and the water supply chamber 101. A movable iron core 5 is provided inside the water-isolating sleeve 4, with the movable iron core 5 facing the valve seat 103. The lower end is enlarged to form a hollow protrusion 501. The inner cavity of the protrusion 501 is equipped with an elastic rubber plug 6 to seal the pilot hole 302. A baffle 8 is provided on the outer periphery of the protrusion 501. The baffle 8 is a hollow tubular structure. A through hole 803 is opened in the middle of the upper end of the baffle 8 for the movable iron core 5 to pass through and move axially. The protrusion 501 moves axially in the tubular inner space of the baffle 8. An annular protrusion 801 is provided on the outer periphery of the baffle 8. An annular rim 303 is provided on the upper side of the support frame 3. An annular groove 304 is opened on the inner side of the rim. The annular protrusion 801 and the annular groove 304 are locked together to fix the baffle 8 and the support frame 3. A second through hole 802 is opened on the outer wall of the baffle 8, which connects the tubular inner space of the baffle 8 and the back pressure chamber 104. The flow cross-sectional area of ​​the second through hole 802 is larger than the flow cross-sectional area of ​​the pilot hole 302.

[0019] When the coil is energized, the movable iron core 5 moves upward to open the pilot hole 302, guiding the water in the back pressure chamber 104 through the second through hole 802, the tubular internal space of the baffle 8, and the pilot hole 302 into the outlet chamber 102 to release pressure. This creates a large pressure difference between the water supply chamber 101 and the back pressure chamber 104, which lifts the sealing diaphragm 2 and opens the main valve, allowing the water supply chamber 101 and the outlet chamber 102 to connect and supply water normally. When the coil is not energized, the movable iron core 5 moves downward to block the pilot hole 302 and close the main valve.

[0020] When the water pressure is below 0.02 MPa, the water pressure difference between the water supply chamber 101 and the back pressure chamber 104 is insufficient to overcome the resistance between the sealing diaphragm 2 and the main valve seat 103, and the sealing diaphragm 2 cannot be opened or the opening is very small. At this time, after the coil is energized, it attracts the movable iron core 5 to move upward away from the pilot hole 302 and continues to move upward. The protrusion 501 of the movable iron core lifts the hollow cover 8, which drives the support frame 3 and the sealing diaphragm 2 to move upward, opening the main valve and allowing water to flow normally.

[0021] Furthermore, the radial gap between the through hole 803 and the movable iron core 5 is designed to be no more than 0.6mm for guiding the lower end of the movable iron core 5, while the upper end of the movable iron core 5 is guided by the water-proof sleeve 4. In this way, it is not easy to tilt when controlling the up and down movement of the movable iron core 5, thereby avoiding tilting when the elastic rubber plug 6 seals the pilot hole 302, so as to avoid unreliable sealing and leakage.

[0022] A second through hole 802 with a flow cross-sectional area larger than the pilot hole 302 is opened through the outer wall of the baffle 8 to connect the tubular internal space of the baffle 8 with the back pressure chamber 104, ensuring that the pilot flow channel from the back pressure chamber 104 to the outlet chamber 102 has sufficient flow and reliable operation, while avoiding the through hole 803 from making a whistling sound when the water supply pressure is high because the flow channel is too narrow.

[0023] Research revealed the following drawback in the first embodiment: the water flowing from the back pressure chamber through the second through-hole 802 of the baffle radially impacts the protrusion 501 of the movable iron core, causing it to shift radially. This results in the elastic rubber plug 6 tilting when sealing the pilot hole 302, potentially leading to unreliable sealing and leakage. To eliminate this drawback, a further design was developed... Figure 3-4The second embodiment of this utility model shown differs from the first embodiment in that the second through hole 802 penetrating the outer wall of the baffle 8 is replaced by a second groove 305 opened on the inner side of the support frame 3. Specifically, the support frame 3 has a second groove 305 axially opened on the inner side of the annular rim 303. This groove extends radially inward along the disc-shaped main body surface of the support frame 3, which faces the lower end opening of the hollow tubular baffle 8, until it connects the lower end opening of the baffle 8 and its tubular internal space, thereby connecting the tubular internal space of the baffle 8 with the back pressure chamber 104. The flow cross-sectional area of ​​the second groove 305 is also larger than the flow cross-sectional area of ​​the pilot hole 302. In this way, since the second groove 305 is on the lower side of the baffle 8, when the water flowing into the tubular internal space of the baffle 8 passes through the second groove 305, the water flow will not radially impact the protrusion 501 of the movable iron core.

Claims

1. An electromagnetic inlet valve for improving low water pressure start-up performance, comprising a valve body (1), a coil assembly (7), a water-proof sleeve (4) located at the center of the coil assembly (7), a movable iron core (5) inside the water-proof sleeve (4), a sealing diaphragm (2) between the water-proof sleeve (4) and the valve body (1), and a support frame (3) rigidly supporting the sealing diaphragm (2), characterized in that, The lower end diameter of the movable iron core (5) is enlarged to form a protrusion (501). An elastic rubber plug (6) is fixed on the protrusion (501), and a baffle (8) is fixedly connected to the support frame (3) on the outer periphery of the protrusion (501). The baffle (8) is a hollow tubular structure. A through hole (803) is opened in the middle of the upper end of the baffle (8) for the movable iron core (5) to move axially. The radial gap between the through hole (803) and the movable iron core (5) is no more than 0.6 mm.

2. The electromagnetic inlet valve for improving low water pressure start-up performance as described in claim 1, characterized in that: The support frame (3) has an annular rim (303) on its upper side, and an annular groove (304) is opened on the inner side of the rim. The cover (8) has an annular protrusion (801) on its outer periphery, and the annular protrusion (801) and the annular groove (304) are engaged and fixed to each other.

3. The electromagnetic inlet valve for improving low water pressure start-up performance as described in claim 2, characterized in that: The outer wall of the baffle (8) is provided with a second through hole (802) that penetrates the outer wall. The flow cross-sectional area of ​​the second through hole (802) is larger than the flow cross-sectional area of ​​the pilot hole (302).

4. The electromagnetic inlet valve for improving low water pressure start-up performance as described in claim 2, characterized in that: The support frame (3) has a second groove (305) on its inner side. The second groove (305) is connected to the lower opening of the baffle (8). The flow cross-sectional area of ​​the second groove (305) is larger than that of the pilot hole (302). It is used to guide the water flow into the baffle (8) along the axial direction to avoid radial impact on the movable iron core (5).

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