Direct-acting water inlet electromagnetic valve with high sealing performance

Abstract

The high-sealing-performance direct-acting type water inlet electromagnetic valve comprises a coil assembly, a movable iron core, a spring, a valve body, a valve cover and a sealing diaphragm assembly. The valve body is provided with internal threads at the opening of the open cavity, the inner side of the internal threads is provided with an annular step, the bottom of the cavity is convexly provided with a valve seat towards the opening, the surrounding edge of the valve cover is externally provided with external threads, and the end face of the surrounding edge is provided with an annular groove; the sealing diaphragm assembly takes a hollow gasket as an insert injection molding elastomer to form a diaphragm with a central circulation hole, a gasket main body is clamped and embedded between the elastomers, and a plurality of support legs protrude along the radial direction and are exposed out of the elastomers; the valve body and the valve cover are screwed and fixed through threads to form a valve cavity, an annular groove and an annular step for embedding a sealing ring seal the valve cavity, a sealing diaphragm assembly is clamped between the valve body and the valve cover, supporting legs are clamped between the annular step and the sealing ring, a diaphragm abuts against and seals the end face of the valve seat, and the bottom of an iron core abuts against and blocks a circulation hole in a conical shape. The hidden danger that the sealing is not firm due to the fact that the iron core sealing rubber plug is shaken and deviates when the rubber diaphragm axially deflects and is separated from the valve seat and equipment vibrates is eliminated.

Description

Technical Field

[0001] The utility model relates to a direct-acting water inlet solenoid valve, in particular to a direct-acting water inlet solenoid valve in which a valve body and a valve cover are fixedly connected by screw threading. The IPC classification belongs to F16K 7 / 12. Background Art

[0002] The existing technology of the direct-acting water inlet solenoid valve is that the valve body and the valve cover are fixed by welding. Figure 1 As shown, the valve cover has three claws 1' extending axially from the periphery of the movable iron core. A central, restricted opening is provided with a cylindrical rubber seal assembly 2' with an embedded metal sheet, which abuts the valve seat of the valve body. When the valve body and valve cover are threaded together, the rubber seal rotates with it, causing the rubber seal to axially deflect away from the empty valve seat, resulting in a loose seal and water leakage during operation. Furthermore, this valve design uses a rubber plug fixed at one end of the movable iron core to directly seal the valve seat. Vibration of the equipment can cause the movable iron core to shift the sealing surface, further compromising the seal.

[0003] For relevant terminology and knowledge, except as specified in this manual, please refer to the Valve Handbook - Selection (Chemical Industry Press, 1st edition, 2013), IEC Dictionary of Electrical and Electronic Standard Terms (China Standards Press, 1st edition, 1992), Electrical Equipment Manufacturing Technology (Machinery Industry Press, 1st edition, 1982), Mechanical Engineering Handbook and Electrical Engineering Handbook (Machinery Industry Press, 1st edition, 1978 and 2nd edition, 1997), GB 14536.9 "Particular Requirements (Including Mechanical Requirements) for Electric Water Valves for Automatic Electric Controls for Household and Similar Purposes", GB / T 21465-2008 "Valve Terminology", and QB / T 1291 "Water Inlet Solenoid Valves for Automatic Washing Machines". Utility Model Content

[0004] In order to solve the above problems, the present invention provides the following technical solutions:

[0005] A direct-acting water inlet solenoid valve with high sealing performance, comprising an action mechanism consisting of a coil assembly, a movable iron core, and a spring, and a sealing mechanism consisting of a valve body, a valve cover, and a sealing diaphragm assembly;

[0006] The valve body has an open cavity, an internal thread is provided at the open end of the cavity, an annular step is provided inside the internal thread, an annular valve seat is provided at the bottom of the cavity protruding toward the opening, a flow channel with a water inlet and a water outlet is also provided in the valve body, and the valve seat divides the flow channel into an inner flow channel located in the center and connected to the water outlet, and an outer flow channel surrounding the inner flow channel and connected to the water inlet;

[0007] The valve cover includes a hollow sleeve located in the center of the coil and a surrounding edge at one end of the coil, the surrounding edge is provided with an external thread, and the end surface of the surrounding edge is provided with an annular groove;

[0008] The sealing diaphragm assembly is formed by injection molding an elastomer with a circular gasket as an insert to form a diaphragm. The center of the diaphragm is formed as a flow hole. The gasket body is sandwiched between the elastomers and several legs protrude radially and are exposed outside the elastomers.

[0009] The valve body and the valve cover are fixedly connected by screwing the internal thread and the external thread together. The cavity of the valve body and the hollow part of the valve cover together constitute a valve cavity. The inside and outside of the valve cavity are sealed by the annular groove and the annular step in which the sealing ring is embedded. The sealing diaphragm assembly is clamped between the valve body and the valve cover. The support legs are clamped between the annular step and the surrounding end face of the valve cover or the sealing ring. The diaphragm abuts and seals the valve seat end face. The bottom of the movable iron core is conical and abuts and blocks the flow hole. When the coil is energized, the movable iron core is attracted away from the flow hole to connect to the flow channel.

[0010] The utility model discloses a direct-acting water inlet solenoid valve, in which a sealing diaphragm assembly abuts against the end face of the valve seat and is clamped on the sealing surface by several legs of a rigid insert, and is firmly axially limited after being screwed and pressed by the valve body and the valve cover thread, thereby eliminating the hidden danger of water leakage caused by axial deviation of the rubber diaphragm from the empty valve seat. The bottom of the movable iron core is processed into a cone shape to abut and seal the flow hole of the diaphragm, which has the functions of automatic alignment, large sealing elastic deformation and radial stop, and solves the problem of water leakage caused by the rubber plug fixed at one end of the movable iron core deviating from the sealing surface when the equipment vibrates.

[0011] The annular step is further designed to have a sink that matches the support foot and a support foot pad placed on the sink, forming a reliable rotational positioning, which can prevent the valve body and valve cover threads from rotating and causing the sealing diaphragm assembly to rotate during assembly, damaging the sealing effect.

[0012] The support legs and the sink are further designed to be provided with mating stoppers to prevent the sealing diaphragm assembly from being installed upside down.

[0013] The typical design of a sealing diaphragm assembly is a circular diaphragm formed by injection molding rubber with a circular copper gasket as an insert. The diaphragm has a central flow hole formed in the center, and the gasket body is sandwiched between the rubber, with three radially protruding legs protruding from the rubber. The gasket can also be made of aluminum or stainless steel. The copper sheet is highly ductile and easy to mold, and it is not prone to rusting in water environments. The rubber is highly elastic and has good sealing properties. Direct-acting water inlet solenoid valves are used in clothes dryers. The flow rate does not exceed 2.5L / min, which is far lower than the flow requirements of washing machines, dishwashers, and water dispensers. Three or more legs do not obstruct the flow rate, and the valve body and bonnet screw together and clamp securely. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded view of a direct-acting water inlet solenoid valve in the prior art;

[0015] Figure 2This is an exploded view of the direct-acting water inlet solenoid valve with high sealing performance of the utility model;

[0016] Figure 3 This is a cross-sectional view of the direct-acting water inlet solenoid valve with high sealing performance of the utility model;

[0017] Figure 4 yes Figure 3 A magnified schematic diagram of area A in the middle;

[0018] Figure 5 yes Figure 2 A three-dimensional cross-sectional view of the middle sealing diaphragm assembly;

[0019] Figure 6 yes Figure 2 Three-dimensional view of the middle valve body.

[0020] Reference numerals:

[0021] Coil assembly 10, movable iron core 20, spring 30;

[0022] Valve body 40, internal thread 41, annular step 42, sink 421, stop 1 422, valve seat 43, water inlet 44, water outlet 45, inner flow channel 47, outer flow channel 48;

[0023] Valve cover 50, external thread 521, annular groove 522;

[0024] Sealing diaphragm assembly 60, gasket 61, support leg 611, stopper 2 612, diaphragm (elastic body) 62, flow hole 621;

[0025] Valve chamber 70;

[0026] Sealing ring 80. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solutions of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments.

[0028] This utility model improves the valve core structure of an existing pilot-operated water inlet solenoid valve. Primarily, the balancing hole in the sealing diaphragm assembly is eliminated, retaining the central pilot hole as the flow hole. The end of the movable core is machined into a tapered shape to block the flow hole, thereby transforming it into a low-flow, direct-acting water inlet solenoid valve. The basic structure and operating principle of a direct-acting valve are common knowledge in the art and are described in Chinese patent document CN215059850U. Threaded pilot valves are also described in Chinese patent document CN215763416U. This utility model inherits the relevant structure and operating principle of these valves and will not be further elaborated in this specification.

[0029] The “center”, “up”, “down”, “inside” and “outside” mentioned in this article are based on Figure 3 In the orientation or position relationship shown, the center line in the figure is the center axis of the coil, that is, the center, and the coil and the valve cover 50 are located above the valve body 40.

[0030] The utility model discloses a direct-acting water inlet solenoid valve with high sealing performance. Figure 2-6 The solenoid valve includes an actuator composed of a coil assembly 10, a movable iron core 20, and a spring 30, and a sealing mechanism composed of a valve body 40, a valve cover 50, and a sealing diaphragm assembly 60.

[0031] The valve body 40 is a plastic component with a shell-like main body. The shell has an open cavity. The edge of the cavity opening end is provided with an internal thread 41 for threaded connection with the valve cover 50. An annular step 42 is provided on the inner side of the internal thread 41, facing the cavity opening end. The annular step 42 has three recessed platforms 421 evenly distributed along the circumference, each recessed platform having a stop 422. The bottom of the cavity is provided with an annular surrounding edge protruding axially toward the opening to form a valve seat 43. A flow channel having a water inlet 44 and a water outlet 45 is provided in the valve body 40. The valve seat 43 divides the flow channel into an inner flow channel 47 located in the center and connected to the water outlet 45, and an outer flow channel 48 surrounding the inner flow channel and connected to the water inlet 44.

[0032] The valve cover 50 is injection-molded at the end of the plastic-encapsulated coil and covers the central through-hole of the plastic-encapsulated coil to form a hollow sleeve to accommodate the movable iron core 20. The outer periphery of the valve cover 50 extends axially to form a cylindrical surrounding edge. The outer wall of the surrounding edge is provided with an external thread 521 adapted to the internal thread 41. The end surface of the surrounding edge is provided with an annular groove 522 for the sealing ring 80 to be inserted.

[0033] The sealing diaphragm assembly 60 is formed by injection molding a circular diaphragm 62 with a circular copper gasket 61 as an insert. A flow hole 621 is formed in the center of the diaphragm. The main body of the gasket 61 is sandwiched between the rubber and has three radially outward protruding legs 611 evenly distributed along the circumference, exposed outside the rubber. Each of the three legs 611 is provided with a second stop 612. The three legs 611 and their second stop 612 are shaped to match the three recessed platforms 421 and their first stop 422 of the valve body 40.

[0034] The valve body 40 and the valve cover 50 are fixedly assembled and connected by screwing together the internal thread 41 and the external thread 521. The cavity of the valve body 40 and the hollow part of the valve cover 50 together constitute the valve cavity 70. The annular groove 522 of the embedded sealing ring 80 and the annular step 42 cooperate to seal the inside and outside of the valve cavity 70. The sealing diaphragm assembly 60 is sandwiched between the valve body 40 and the valve cover 50. The three evenly distributed legs 611 are placed on the three evenly distributed sinks 421, thereby sandwiched between the annular step 42 and the sealing The ring 80 prevents the valve body 40 and the valve cover 50 from being screwed together and driving the sealing diaphragm assembly 60 to rotate and damage the sealing effect. The stop 1 422 of the sink 421 and the stop 2 612 of the support leg 611 form a mutually matching stop to prevent the sealing diaphragm assembly 60 from being installed upside down. The diaphragm 62 abuts the end face of the sealing valve seat 43, the flow hole 621 is aligned with the center of the valve seat 43, and the bottom of the movable iron core 20 is conical and abuts the flow hole 621 of the diaphragm 62 to achieve valve sealing.

[0035] The movable iron core 20 is located above the diaphragm 62. When the winding is energized, it rises to open the flow hole 621. When the winding is de-energized, it descends to block the flow hole 621. The working principle of the solenoid valve is prior art and has been described in detail in the background art, so it will not be repeated here.

[0036] In this way, the sealing diaphragm assembly abutting the end face of the valve seat is clamped on the sealing surface by the support legs of the metal insert, and is firmly axially limited after being screwed and pressed by the valve body and the valve cover threads, eliminating the hidden danger of water leakage caused by the axial deviation of the rubber diaphragm from the empty valve seat. The bottom of the movable iron core is processed into a cone to abut and seal the diaphragm flow hole, which has the functions of automatic alignment, large sealing elastic deformation and radial stop, and solves the problem of water leakage caused by the rubber plug fixed at one end of the movable iron core deviating from the sealing surface when the equipment vibrates; the direct-acting water inlet solenoid valve is used in dryers, and the flow rate does not exceed 2.5L / min, which is far lower than the flow requirements of washing machines, dishwashers, and water dispensers. The support legs set on the flow path do not block and affect the water inlet flow. The number of three or more support legs still reserves a sufficient flow cross-section for the flow channel between adjacent support legs.

[0037] The support foot clamped between the annular step 42 and the sealing ring 80 can also be reduced in size radially. The support foot does not contact the sealing ring, but is clamped by the annular step 42 and the surrounding end face of the valve cover 50 (see CN215763416U). It can also be securely limited axially, eliminating the hidden danger of water leakage caused by the axial deflection of the rubber diaphragm away from the empty valve seat.

[0038] The annular groove 522 provided on the peripheral end face of the valve cover 50 for embedding the sealing ring 80 can also be provided on the annular step 42 of the valve body 40, which can also reliably seal and achieve firm axial limitation; accordingly, the sink 421 and the stop 422 on the sink can be changed to the peripheral end face of the valve cover 50.

[0039] The gasket is made of copper, which has high ductility and is easy to form. It is not easy to rust when used in a water environment. Aluminum or stainless steel can also be used. Aluminum is slightly more likely to rust than copper in a water environment, while stainless steel has no risk of rusting. High-rigidity plastic materials can also be used to further reduce costs.

[0040] The diaphragm is made of rubber material with high elasticity and good sealing performance. It can also be made of thermoplastic elastomers such as TPE, TPV, TPO, etc. The insert molding injection molding process has good performance and is conducive to reducing costs. As long as the elastomer has sealing properties, it can be used.

[0041] The valve cover is injection-molded at the end of the plastic-sealed coil, and can also be replaced by a traditional assembly structure in which the valve cover and the coil are assembled.

[0042] The threaded screw-on fixation of the valve body and the valve cover can be replaced by welding or by flange surface bolt fastening. An annular step is provided on the inner side of the fixed end on one side, and an adaptive annular step is also provided on the inner side of the fixed end on the other side, so as to clamp the support legs of the fixed sealing diaphragm assembly. Of course, the support legs are clamped between the annular step and the sealing ring. The elasticity of the sealing ring is conducive to reliable compaction during tightening, and is more suitable for threaded screw-on fixation. A sealing ring with a square cross-section is used here for stronger compaction, while an O-ring is used for both processability and economy.

[0043] Although specific embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and overlays may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A direct-acting water inlet solenoid valve with high sealing performance, comprising an actuating mechanism consisting of a coil assembly (10), a movable iron core (20), and a spring (30), a valve body (40), a valve cover (50), and a sealing diaphragm assembly (60); The valve body (40) has an open cavity, an internal thread (41) is provided at the open end of the cavity, an annular step (42) is provided inside the internal thread, and an annular valve seat (43) is provided at the bottom of the cavity protruding toward the opening. A flow channel with a water inlet (44) and a water outlet (45) is also provided in the valve body (40), and the valve seat (43) divides the flow channel into an inner flow channel (47) located in the center and connected to the water outlet (45) and an outer flow channel (48) surrounding the inner flow channel (47) and connected to the water inlet (44); The valve cover (50) includes a hollow sleeve located in the center of the coil and a surrounding edge at one end of the coil, wherein the surrounding edge is provided with an external thread (521) and an annular groove (522) is provided on the end surface of the surrounding edge; Its characteristics are: The sealing diaphragm assembly (60) is formed by injection molding an elastic body with a circular gasket (61) as an insert to form a diaphragm (62). The center of the diaphragm is formed as a flow hole (621). The main body of the gasket (61) is sandwiched between the elastic bodies, and several legs (611) protrude radially and are exposed outside the elastic body. The valve body (40) and the valve cover (50) are fixedly connected by screwing the internal thread (41) and the external thread (521). The cavity of the valve body (40) and the hollow part of the valve cover (50) together constitute a valve cavity (70). The inside and outside of the valve cavity are sealed by the annular groove (522) and the annular step (42) of the embedded sealing ring (80). The sealing diaphragm assembly (60) is clamped between the valve body (40) and the valve cover (50). The support leg (611) is clamped between the annular step (42) and the edge end face of the valve cover (50) or the sealing ring (80). The diaphragm (62) abuts and seals the end face of the valve seat (43). The bottom of the movable iron core (20) is conical and abuts to block the flow hole (621). When the coil is energized, the movable iron core (20) is attracted away from the flow hole (621) to connect to the flow channel.

2. The direct-acting water inlet solenoid valve with high sealing performance according to claim 1, characterized in that: The annular step (42) is provided with a sunken platform (421) adapted to the supporting foot (611), and the supporting foot (611) is placed on the sunken platform (421).

3. The direct-acting water inlet solenoid valve with high sealing performance according to claim 2, characterized in that: The supporting foot (611) and the sinking platform (421) are provided with mutually matching stoppers (612, 422).

4. The direct-acting water inlet solenoid valve with high sealing performance according to claim 2, characterized in that: The plurality of supporting legs (611) are three supporting legs evenly distributed along the circumference of the sealing diaphragm assembly (60), and the sinking platforms (421) are three sinking platforms evenly distributed along the circumference of the annular step (42).

5. The direct-acting water inlet solenoid valve with high sealing performance according to claim 1, characterized in that: The cross section of the sealing ring (80) is square, the elastic body is made of rubber material, and the gasket (61) is made of copper material, aluminum material or stainless steel.

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