RU2788800C1 - Water solenoid valve capable of increasing the electromagnetic suction force and method for implementation thereof - Google Patents

Abstract

FIELD: valve engineering.

SUBSTANCE: invention reveals a water solenoid valve capable of increasing the force of electromagnetic suction and a method for the implementation thereof. Method includes the stages of: producing a stator assembly with a plastic seal by injecting plastic onto a stator assembly, a stator assembly with a plastic seal; assembling the stator assembly with a plastic seal and a valve body assembly containing a movable iron core so as to form a water solenoid valve, wherein the upper end surface of the movable iron core in the initial position is installed no lower than the upper edge of the lower magnetically conductive inner sleeve and no higher than 1/4 of the distance from the upper edge of the lower magnetically conductive inner sleeve to the lower edge of the upper magnetically conductive inner sleeve, in order to increase the electromagnetic suction force of the water solenoid valve. The stator assembly with a plastic seal comprises a coil assembly; an upper magnetically conductive inner sleeve and a lower magnetically conductive inner sleeve, set in the hole of the coil assembly; a water-insulating sleeve located inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve; a yoke located outside of the coil and connecting the upper magnetically conductive inner sleeves with the lower magnetically conductive inner sleeves; a magnetically conductive seat installed on the inside of the water-insulating sleeve; and a plastic sealing layer covering the coil assembly and the yoke.

EFFECT: possibility of increasing the force of electromagnetic suction be means of a water solenoid valve.

35 cl, 17 dwg

Description

Technical field

The invention relates to the field of technology for the manufacture of a solenoid valve for water, and in particular to a solenoid valve for water capable of increasing the force of electromagnetic suction, and a method for its implementation.

Prior Art

The water solenoid valve (or water inlet valve) controls the supply or shutdown of the water source. Since the water has a certain pressure during operation, it can be designed as a glandless solenoid valve for water with servo control. In FIG. 1 shows the construction of the most commonly used water solenoid valve, including a plastic sealing layer 116 for plastic sealing of the coil winding, a magnetic yoke 111 mounted outside the plastic sealing layer, a plug 107, a water inlet 215, and a water outlet 216.

In FIG. 1 shows a solenoid valve for water, essentially consisting of two parts: a control valve and a main valve. When the winding 109 is de-energized, the movable iron core 201 falls under its own weight and the reaction force of the return spring and closes the flow hole 210 of the main valve plug 203, as a result of which the water entering the upper cavity of the valve plug from the balancing hole 213 cannot flow out, and due to the difference in effective areas of support on the valve diaphragm and under it, a pressure difference is formed, as a result of which the valve plug diaphragm is pressed against the main valve seat, and the valve closes. When the coil 109 is energized, the magnetic attraction pulls the movable iron core 201 upward and the water in the upper cavity 211 of the valve plug is flushed to the valve outlet through the flow port 210. Because the flow port capacity is designed to be much greater than the counterbalance hole 213, a sufficient pressure loss is created on the balance hole 213 by the water flow, the pressure in the upper cavity 211 of the valve plug decreases sharply, while the pressure in the lower cavity 212 of the valve plug is maintained the same as the inlet pressure, as a result of which the difference in pressure between the top and bottom sides of the valve plug diaphragm causes the valve plug diaphragm to bulge upward and the valve opens.

The main problem with the water solenoid valve shown in FIG. 1 is that the water bushing 117 must be manufactured separately, and the water bushing 117 produced is inserted into the magnetically conductive inner bushing by assembly, so the water bushing 117 installed in the middle hole of the coil stand 104 must have a certain thickness in order to withstand the pressure at closed valve and possible structural damage during mechanical assembly, resulting in the non-operating air gap of the existing solenoid valve for water exceeding 1.5 mm, which requires the application of more electromagnetic force to drive the movable iron core; moreover, separate manufacture of the waterproofing sleeve increases the cost of manufacture.

In addition, since the yoke 111 is installed on the outside of the plastic encapsulating coil winding layer 116 with plastic sealing, the yoke 111 must be welded together with the magnetically conductive inner sleeve to secure the yoke to the coil post through the magnetically conductive inner sleeve, which increases the welding process and manufacturing cost.

All enameled water solenoid valve coil wires on the market use copper wires, with a total weight of about 26.5-28g. Reducing the amount of copper wire is the easiest way to reduce cost. However, reducing the number of copper wires will inevitably affect the efficiency of the water solenoid valves. By improving the structure of the magnetic circuit, the use of copper wire can be reduced while maintaining or even improving the efficiency level of the water inlet valve, and a balance between efficiency and cost can be achieved, which is a problem to be solved by the invention.

Disclosure of invention

The object of the invention is to provide a water solenoid valve capable of increasing electromagnetic force and a method for increasing its electromagnetic force acting on a movable iron core, as well as simplifying the manufacturing process for manufacturing a water solenoid valve and reducing manufacturing cost.

According to a first aspect of the invention, there is provided a method for providing a water solenoid valve capable of increasing the electromagnetic suction force of the water solenoid valve, comprising the steps of:

a stator assembly with a plastic seal is obtained by injecting plastic onto the stator assembly, the stator assembly with a plastic seal comprising:

coil unit;

an upper magnetically conductive inner sleeve and a lower magnetically conductive inner sleeve installed in the hole of the coil assembly;

a waterproofing sleeve located inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve;

a yoke located outside the coil assembly and connecting the upper magnetically conductive inner bushings and the lower magnetically conductive inner bushings;

a magnetically conductive saddle mounted on the inside of the waterproof sleeve; as well as

a plastic sealing layer covering the coil assembly and the yoke;

assembling together the stator assembly with the plastic seal and the valve body assembly containing the movable iron core to form a water solenoid valve;

at the same time, the upper end surface of the movable iron core in the initial position is set not lower than the upper edge of the lower magnetically conductive inner sleeve, and not higher than 1/4 of the distance from the upper edge of the lower magnetically conductive inner sleeve to the lower edge of the upper magnetically conductive inner sleeve in order to increase the electromagnetic suction force solenoid valve for water.

Preferably, the length of the movable iron core in the lower conductive inner sleeve at the initial position is set to not less than 1/4 of the sum of the heights of the upper and lower conductive inner sleeves, so that the core material can be saved.

Preferably, the gap between the upper conductive inner sleeve and the lower conductive inner sleeve is 2-5 mm; the diameter of the movable iron core is reduced from 6 mm to 5 ± 0.1 mm; the inner diameter of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 6.5 ± 0.1 mm, the wall thickness is 1 mm, the outer diameter is 8.5 ± 0.1 mm; the waterproof sleeve has an inner diameter of 5.5 ± 0.1 mm and an outer diameter of 6.5 ± 0.1 mm; and the weight of the magnetically conductive seat is not less than 60% of the weight of the movable iron core.

Preferably, the inner sides of the upper magnetic inner sleeve and the lower magnetic inner sleeve installed in the coil assembly are injected with plastic to form a water-proof sleeve on the inner sides of the upper magnetic inner sleeve and the lower magnetic inner sleeve.

Preferably, the waterproof sleeve assembly, comprising a waterproof sleeve formed inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve, is made by injecting plastic on the upper magnetically conductive inner sleeve, the stopper and the lower magnetically conductive inner sleeve placed together as an insert; then, a water-insulating sleeve assembly is installed in the hole of the coil assembly.

Preferably, the upper conductive inner sleeve and the lower conductive inner sleeve are in the form of a cylinder, and the wall of the cylinder is provided with radial through holes for the passage of adhesive.

Preferably, the inner surfaces of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve are provided with axial grooves of the magnetically conductive inner sleeve communicating with the radial through holes.

Preferably, when the plastic is injected into the hole of the coil post provided with the upper magnetic inner sleeve and the lower magnetic inner sleeve, the injected plastic used to form the water sealing sleeve flows into the radial through hole along the axial grooves of the magnetically conductive inner sleeve, thus forming a root part for attaching the water sealing sleeve. bushings.

According to a second aspect of the invention, there is provided a solenoid valve for water capable of increasing an electromagnetic suction force, which comprises:

a stator assembly with a plastic seal, comprising:

coil unit;

an upper magnetically conductive inner sleeve and a lower magnetically conductive inner sleeve installed in the hole of the coil assembly;

a waterproofing sleeve located inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve;

a yoke located outside the coil assembly and connecting the upper magnetically conductive inner bushings and the lower magnetically conductive inner bushings;

a magnetically conductive saddle mounted on the inside of the waterproof sleeve; as well as

a plastic sealing layer covering the cap assembly and yoke;

a valve body assembly comprising a movable iron core for assembly with a stator assembly with a plastic seal to form a solenoid valve for water;

at the same time, the upper end surface of the movable iron core in the initial position is installed not lower than the upper edge of the lower magnetically conductive inner sleeve and not higher than 1/4 of the distance from the upper edge of the lower magnetically conductive inner sleeve to the lower edge of the upper magnetically conductive inner sleeve in order to increase the electromagnetic suction force of the solenoid water valve.

Preferably, the length of the movable iron core in the lower magnetically conductive inner sleeve in the initial position is set to a value of not less than 1/4 of the sum of the heights of the upper and lower magnetically conductive inner sleeves.

Preferably, the gap between the upper conductive inner sleeve and the lower conductive inner sleeve is 2 mm to 5 mm; the diameter of the movable iron core is reduced from 6 mm to 5 ± 0.1 mm; the inner diameter of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 6.5 ± 0.1 mm, the wall thickness is 1 mm, the outer diameter is 8.5 ± 0.1 mm; the waterproof sleeve has an inner diameter of 5.5 ± 0.1 mm and an outer diameter of 6.5 ± 0.1 mm; and the weight of the magnetically conductive seat is not less than 60% of the weight of the movable iron core.

Preferably, plastic injection is carried out on the inner sides of the upper magnetic inner sleeve and the lower magnetic inner sleeve, which are installed in the coil assembly so as to form a water-proof sleeve on the inner sides of the upper magnetic inner sleeve and the lower magnetic inner sleeve.

Preferably, the waterproof sleeve assembly, comprising a waterproof sleeve formed inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve, is made by injecting plastic on the upper magnetically conductive inner sleeve, the stopper and the lower magnetically conductive inner sleeve placed together as an insert; then the water-insulating sleeve assembly is installed in the hole of the coil assembly.

Preferably, the upper conductive inner sleeve and the lower conductive inner sleeve are in the form of a cylinder, and the wall of the cylinder is provided with radial through holes for the passage of adhesive.

Preferably, the inner surfaces of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve are provided with axial grooves of the magnetically conductive inner sleeve communicating with the radial through holes.

Preferably, by injecting the plastic into the opening of the coil post provided with the upper magnetic inner sleeve and the lower magnetic inner sleeve, the injected plastic used to form the water sealing sleeve flows into the radial through hole along the axial grooves of the magnetically conductive inner sleeve, thereby forming a root portion for attaching the water sealing sleeve. bushings.

According to a third aspect of the invention, there is provided a method for making a stator assembly with a water seal applied to a solenoid valve for water, comprising the steps of:

forming a coil assembly with a cavity by placing an element including an insert on a coil post wound with a coil winding;

forming a stator assembly by installing an upper magnetically conductive inner sleeve and a lower magnetically conductive inner sleeve on both sides in a hole in the coil post of the coil assembly, and attaching a yoke connecting the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve outside the coil assembly;

plastic is injected onto the stator assembly to form a stator assembly with a waterproof bushing.

Preferably, the step of injecting plastic onto the stator assembly to form the stator assembly with the water barrier includes:

by injecting plastic onto the stator assembly, covering the coil winding and yoke with plastic, leaving the insert and hole in the coil post exposed, thereby making the main stator assembly with a plastic seal;

by injecting the plastic into the main stator assembly with the plastic seal, forming the water bushing in the hole of the coil stand with the upper magnetically conductive inner bushing and the lower magnetically conducting inner bushing, thereby making the stator assembly with the water bushing.

Preferably, the coil stand opening has a conductive inner sleeve positioning ring for positioning the upper conductive inner sleeve and the lower conductive inner sleeve so as to keep the upper conductive inner sleeve and the lower conductive inner sleeve at a predetermined distance in the coil stand opening.

Preferably, simultaneously with the injection of plastic into the main stator assembly with a plastic seal, a water insulating base is formed located at the lower end of the water insulating sleeve, which is used to connect and fasten the body assembly of the solenoid valve for water.

According to a fourth aspect of the invention, there is provided a method for making a stator assembly with a water seal applied to a solenoid valve for water, comprising the steps of:

forming a waterproof sleeve assembly with a magnetically conductive sleeve by injecting plastic into the upper magnetically conductive inner sleeve, the stopper, and the lower magnetically conductive inner sleeve to form the waterproofing sleeve;

forming a coil assembly by placing an element including an insert on a coil stand wound with a coil winding, and attaching a yoke connecting the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve outside the coil assembly;

inserting the waterproof sleeve assembly with the magnetically conductive sleeve into the hole of the coil post of the coil assembly to form the stator assembly;

a stator assembly is made with a water insulating sleeve by injecting plastic into the stator assembly to cover the coil winding and the yoke on the stator assembly.

Preferably, the waterproof sleeve assembly comprises:

an upper conductive inner sleeve, a stopper, and a lower conductive inner sleeve which are bonded together by injection of a plastic;

a waterproof sleeve formed on the inner surfaces of the upper conductive inner sleeve, the stopper, and the lower conductive inner sleeve by injection of a plastic;

the base of the waterproofing sleeve, located at the lower end of the waterproofing sleeve and made with it in one piece.

Preferably, the upper conductive inner sleeve and the lower conductive inner sleeve are respectively a cylinder, and the walls of the cylinder are provided with radial through holes through which adhesive flows.

Preferably, the inner surfaces of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve are provided with axial grooves communicating with the radial through holes.

Preferably, the inner surfaces of the upper and lower conductive inner sleeves are provided with circumferential grooves that communicate with the axial grooves.

Preferably, by injecting plastic on the inner surfaces of the upper magnetic inner sleeve and the lower magnetic inner sleeve, a waterproofing sleeve and a base of the waterproofing sleeve are formed; during plastic injection, hot molten plastic flows into the radial through hole of the magnetically conductive inner sleeve along the axial grooves of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve, forming a root part for attaching the injection water jacket.

According to a fifth aspect of the invention, there is provided a water bushing stator assembly for use with a solenoid valve for water, comprising:

a spool assembly comprising a spool post, a coil winding wound on the spool post, and an insert provided on the spool post, the spool post hole being formed in the middle of the spool post;

an upper magnetically conductive inner sleeve, a lower magnetically conductive inner sleeve, and a water-insulating sleeve, which are located in the opening of the coil stand, the water-insulating sleeve being formed by injecting plastic onto the inner surfaces of the upper magnetically conducting inner sleeve and the lower magnetically conducting inner sleeve;

a yoke located outside the coil assembly, wherein the upper end and the lower end of the yoke are closely connected with the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve, respectively;

a plastic sealing layer covering the bobbin assembly formed by injection of plastic, while the plastic sealing layer does not cover the part of the insert electrically connected to the external power supply.

Preferably, the lower end of the water seal is provided with a base of the water seal made in one piece by injection of plastic, wherein the base of the water seal is not covered with a plastic sealing layer to be connected and secured to the body of the solenoid water inlet valve.

Preferably, the positioning groove of the yoke clamps the yoke positioning protrusions provided on the upper and lower end surfaces of the spool post, whereby the yoke is positioned on the spool post on one side and connected to the upper conductive inner sleeve on the other side.

Preferably, the upper conductive inner sleeve and the lower conductive inner sleeve are cylindrical, and both are provided with sealing sleeve structures for attaching the waterproof sleeve to the inner surfaces of the upper conductive inner sleeve and the lower conductive inner sleeve.

Preferably, the locking structure of the waterproofing sleeve includes a radial through hole through which the adhesive flows.

Preferably, the locking structure of the water insulating sleeve further comprises grooves formed on the inner surfaces of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve.

Preferably, the groove comprises an axial groove in communication with the radial through hole.

Preferably, the groove comprises a circumferential groove in communication with the axial groove.

According to a sixth aspect of the invention, there is provided a water solenoid valve comprising a valve body assembly and the aforementioned water bushing stator assembly, the water bushing stator assembly being assembled together with the valve body assembly to form a water solenoid valve.

With regard to the prior art, an advantageous technical effect of the invention is that the improvement in the design of the magnetic circuit increases the suction force of the end surface generated by the main magnetic flux, so that the total electromagnetic suction force becomes larger when the valve is actuated, and the operation efficiency when actuated low pressure is better.

In addition, by forming the water seal on the inner surfaces of the upper conductive inner bush and the lower conductive inner bush by injection of plastic, the thickness of the water bush can be greatly reduced, thereby increasing the electromagnetic force acting on the movable iron core.

On the other hand, by fixing the yoke and the coil assembly together by injection of plastic, the manufacturing process of the water solenoid valve can be simplified, the production cost can be reduced, and the product quality can be improved.

The invention will be described in detail below with reference to the drawings and embodiments in order to better understand the contents, features and technical effects of the invention.

Brief description of the drawings

In FIG. 1 schematically shows the construction of a conventional solenoid valve for water;

in fig. 2 is a diagram explaining the load reaction force of the movable iron core with respect to the stroke of the movable iron core;

in fig. 3 is a sectional view of a solenoid valve for water according to the invention;

in fig. 4 shows a sectional view of a stator assembly with a plastic seal of a solenoid valve for water according to the invention;

in fig. 5 is an exploded view of the stator assembly of a solenoid valve for water according to the invention;

in fig. 6 is a perspective view of the stator assembly of a solenoid valve for water according to the invention;

in fig. 7 is a main stator assembly with a plastic seal formed by first injecting plastic onto the stator assembly of a solenoid valve for water according to the invention, in perspective view;

in fig. 8 shows a sectional view of a stator assembly with a plastic seal of a solenoid valve for water according to the invention;

in fig. 9a is a first embodiment of the upper magnetically conductive inner sleeve of the solenoid valve for water according to the invention, front view;

in fig. 9b is a sectional view along plane A-A in FIG. 9a according to the invention;

in fig. 9c is a sectional view along plane B-B in FIG. 9a according to the invention;

in fig. 9d is a perspective view of a first embodiment of an upper magnetically conductive inner sleeve of a solenoid valve for water according to the invention;

in fig. 10 is a perspective view of a stator assembly with a water seal formed by a main stator assembly with a water solenoid valve plastic seal, which has been subjected to a secondary plastic seal according to the invention;

in fig. 11 shows a sectional view of a stator assembly with a water insulating sleeve of a solenoid valve for water according to the invention;

in fig. 12-14 are schematic views of another embodiment of the invention for forming a water barrier sleeve, wherein FIG. 12 shows the positioning relationship of the upper conductive inner sleeve, the lower conductive inner sleeve and the stopper as an insert, FIG. 13 is a perspective view of a waterproof sleeve assembly formed by injection of plastic onto the upper conductive inner sleeve, the lower conductive inner sleeve, and the stopper as inserts, and FIG. 14 - water insulating sleeve assembly, sectional view.

Description of symbols: stator assembly with water insulating sleeve - 100; main stator unit with plastic seal - 101; stator assembly - 102; coil assembly - 103; coil stand - 104; yoke positioning protrusion - 105; positioning ring of the magnetically conductive inner sleeve - 106; insert - 107; electronic components - 108; coil winding - 109; yoke - 111; yoke positioning groove - 112; upper magnetically conductive inner sleeve - 113; lower magnetically conductive inner sleeve - 114; through hole for glue magnetically conductive inner sleeve - 115; plastic sealing layer - 116; waterproof sleeve - 117; the base of the waterproofing sleeve - 118; the inner cavity of the waterproofing sleeve - 119; magnetically conductive saddle - 121; axial inner groove of the magnetically conductive inner sleeve - 122; connecting seam of the magnetically conductive inner sleeve - 123; return spring - 200; movable iron core - 201; flow port valve plug rubber - 202; valve plug - 203; valve plug rubber - 204; valve body - 205; mounting rack - 206; pressure release ring - 207; rubber gasket - 208; filter mesh unit - 209; flow hole - 210; the upper cavity of the valve plug - 211; the lower cavity of the valve plug - 212; balancing hole - 213; water inlet - 215; release for water - 216.

Embodiments of the invention

The invention starts from the structure of the coil post, the magnetically conductive inner sleeve, the water-insulating sleeve, the movable iron core and the magnetically conductive base, and increases the electromagnetic suction force at the start of the water inlet valve by improving the structure of the magnetic circuit, while the wire consumption is reduced and the cost is also reduced under the condition of minimum starting voltage requirements.

The magnetic circuit of the solenoid valve for water according to the invention consists of a yoke, a magnetically conductive seat, an upper magnetically conductive inner sleeve, a movable iron core, and a lower magnetically conductive inner sleeve.

In FIG. 2 shows the relationship between the load reaction force of the movable iron core and the stroke of the movable iron core, and the characteristic of the load reaction force acting on the movable iron core during operation is shown as curve 1 in FIG. 2. In the F-S coordinate system, F is the load reaction force acting on the movable iron core, and S is the suction stroke of the movable iron core. The load reaction force mainly consists of the force F1 of water acting on the movable iron core, the self-weight G of the movable iron core, and the spring force F2, where the forces F1 and F2 are large and variable. When the movable iron core closes the flow hole, the force F1 is equal to the product of the pressure of the water source and the cross-sectional area of the flow hole, and point A in the figure corresponds to the closed state of the valve; at the initial stage of lifting the movable iron core after the power is turned on, since the valve plug diaphragm also rises, the flow hole cannot be unlocked, the pressure of the upper cavity of the valve plug still has a downward force exerted on the movable iron core, but constantly decreases; then the spring is compressed and the force of the spring is increased. Since the force F1 decreases faster than the force F2 increases, the first half of curve 1 decreases slowly. At point B, the valve plug diaphragm fully rises, the flow port is unlocked, the F1 force completely disappears, and the load reaction force quickly drops to its lowest point; after that, the movable iron core rises against the force F2, and the angle of inclination for the inclined line segment after point B is the coefficient of elasticity of the spring.

In order to adapt to the characteristic of the load reaction force, the characteristic of the electromagnetic suction force acting on the movable iron core is shown in FIG. 2. The relative positions of the upper conductive inner sleeve, the lower magnetic conductive inner sleeve, and the movable iron core play an important role in the specific effect of the electromagnetic suction force. Between the movable iron core and the upper magnetically conductive inner sleeve there is a working air gap, and between the movable iron core and the lower magnetically conductive inner sleeve there is a main non-working air gap. Until the movable iron core is sucked into the upper magnetically conductive inner sleeve, the magnetic potential mainly drops in the working air gap; the electromagnetic suction force includes an electromagnetic force generated by the leakage flux on the side surface of the movable iron core and an end surface suction force generated by the main magnetic flux; when the upper end surface of the movable iron core is close to the lower end of the upper conductive inner sleeve, the suction effect of the end surface is larger; the closer the upper end surface is to the lower edge of the upper magnetic inner sleeve, the greater the total electromagnetic suction force, and the maximum value is reached when the movable iron core is already almost entering the upper magnetically conductive inner sleeve. After the movable iron core is sucked into the upper magnetic conductive inner sleeve, the length of the working air gap does not change, the area of the air gap increases with the depth of the movable iron core, the magnetic working air gap rapidly increases to a degree that can be compared with the magnetic conductivity of the non-working air gap, in as a result, the magnetic pressure drop of the working air gap decreases proportionally and, thus, the electromagnetic suction force decreases. The downward section of the characteristic curve of the electromagnetic suction force and the upward section of the characteristic curve of the load reaction intersect at point C, the movable iron core completes its movement, and the water solenoid valve is also conductive*.

In view of the fact that the movable iron core must have a certain suction stroke, there is magnetic leakage in the gap between the upper magnetic inner sleeve and the lower magnetic inner sleeve, and the magnetic seat is installed in the upper magnetic inner sleeve, the invention improves the structure of the magnetic circuit as follows:

1. The upper end surface of the movable iron core in its initial position (equivalent to the position in which the movable iron core is before power is turned on) is not lower than the upper edge of the lower magnetically conductive inner sleeve and not higher than 1/4 of the distance between the upper edge of the lower magnetically conductive inner sleeve and the lower edge of the upper magnetically conductive inner sleeve, whereby the upper end surface of the movable iron core in the initial position is slightly higher than the upper edge of the lower magnetically conductive inner sleeve so that the magnetic leakage of the gap between the upper edge of the lower magnetically conductive inner sleeve and the lower edge of the upper magnetically conductive inner The sleeve fully acted on the movable iron core in the initial position and ensured that the movable iron core had a reliable suction stroke, thereby improving the suction reliability.

2. the length of the socket between the movable iron core in the initial position and the lower magnetically conductive inner sleeve (equivalent to the length of the movable iron core in the initial position in the lower magnetically conductive inner sleeve) is at least 1/4 of the sum of the heights of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve, i.e., the length of the movable iron core can be less than the length of the lower conductive inner sleeve, but greater than or equal to 1/2 the length of the lower conductive inner sleeve, to ensure that the non-working air gap magnetic conductivity is not too small, the iron core is saturated , and improves the ability of the water solenoid valve to withstand a large impact of impulse current.

Specific numerical values are set as follows:

the gap between the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 2-5 mm;

the weight of the magnetically conductive seat must be at least 60% of the weight of the movable iron core;

the diameter of the movable iron core is reduced from 6 mm to 5 ± 0.1 mm;

The inner diameter of the waterproof sleeve is 5.5±0.1mm, the wall thickness is 0.5mm, the outer diameter is 6.5±0.1mm;

the inner diameter of the magnetically conductive inner sleeve is 6.5 ± 0.1 mm, the wall thickness is 1 mm, the outer diameter is 8.5 ± 0.1 mm;

the opening of the hole in the coil stand is about 8.7 mm; as well as

coil stand wall thickness reduced from 1 mm to 0.4 mm.

By reducing the diameter of the movable iron core, the noise generated during a collision due to the attraction between the magnetized conductive seat and the movable iron core is also reduced when the coil winding is energized. The hole openings of the waterproofing sleeve, the upper conductive inner sleeve and the lower magnetic conductive inner sleeve, as well as the coil stand are reduced to compensate for the reduction in the diameter of the movable iron core. When the opening of the coil post hole decreases, the consumption of copper wire decreases, the resistance of the winding decreases, and the current increases, provided that the number of turns of the winding and the diameter of the wire are unchanged, which improves the attraction of the solenoid and reduces the voltage starting characteristics.

The invention provides a method for making a water solenoid valve capable of increasing the electromagnetic suction force, which includes the steps of:

getting a stator assembly with a plastic seal by injecting plastic onto the stator assembly;

assembling the plastic-sealed stator assembly and the valve body assembly including the movable iron core 201 together to form a water solenoid valve;

as shown in FIG. 3, a plastic sealed stator assembly according to the invention comprises: a coil assembly 103 having a coil stand 104, a coil winding 109 wound around the coil stand 104, an insert 107, and an electronic component 108 mounted on the coil stand 104 (see FIG. five); an upper conductive inner sleeve 113 and a lower conductive inner sleeve 114 installed in the opening of the coil assembly; a waterproof sleeve 117 located inside the upper conductive inner sleeve 113 and the lower conductive inner sleeve 114; a yoke 111 located outside the coil assembly and connecting the upper magnetically conductive inner sleeve 113 and the lower magnetically conductive inner sleeve 114; a magnetically conductive saddle 121 installed inside the upper waterproof sleeve 117; and a plastic sealing layer 116 covering the spool assembly and yoke 111.

According to the invention, the upper end surface of the movable iron core 201 in the initial position is set not lower than the upper edge of the lower magnetically conductive inner sleeve 114 and not higher than 1/4 of the distance from the upper edge of the lower magnetically conductive inner sleeve 114 to the lower edge of the upper magnetically conductive inner sleeve 113 to increase the solenoid suction force of the solenoid valve for water.

As shown in FIG. 3, the body assembly of the solenoid valve for water according to the invention includes: a return spring 200 and a movable iron core 201, which are housed in a water-insulating sleeve; flow port valve plug rubber 202; valve plug 203; rubber 204 valve plugs; valve body 205, mounting post 206, pressure relief ring 207, rubber gasket 208, and filter mesh assembly 209, etc. Since all of these components of the water solenoid valve body assembly are components of the existing water solenoid valve, the relationship between the connections is also essentially the same as in the prior art, they are within the scope of the prior art. For the sake of brevity, a detailed description of what is considered prior art is omitted.

According to the invention, by setting the length of the movable iron core in the lower conductive inner sleeve at the initial position to not less than 1/4 of the sum of the heights of the upper conductive inner sleeve and the lower conductive inner sleeve, in order to ensure that the magnetic conductivity of the non-operating air gap is not too small, magnetic interference is prevented. saturation of the iron core and improves the ability of the water solenoid valve to withstand the impact of large impulse current.

The specific parameters of the invention for achieving the above-mentioned improvement in the structure of the magnetic circuit include: the gap between the upper and lower magnetically conductive inner sleeves is 2 mm to 5 mm; the diameter of the movable iron core is reduced from 6 mm to 5 ± 0.1 mm; the inner diameter of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 6.5 ± 0.1 mm, the wall thickness is 1 mm, the outer diameter is 8.5 ± 0.1 mm; the inner diameter of the waterproof sleeve is 5.5 ± 0.1 mm, the outer diameter is 6.5 ± 0.1 mm; and the weight of the conductive seat is not less than 60% of the weight of the movable iron core, so as to properly enlarge the conductive seat, increase the electromagnetic suction force, and improve the suction reliability of the valve.

As shown in FIG. 4, the invention can form a water seal inside the upper and lower magnetically conductive inner grommets 113 and 114 by injecting plastic into the inside of the upper and lower magnetically conductive inner grommets 113 and 114 installed in the coil assembly.

In FIG. 5 - fig. 11 shows the specific process of forming a water seal inside the upper and lower conductive inner sleeves 113 and 114 according to the invention.

As shown in FIG. 5, the upper conductive inner sleeve 113 and the lower conductive inner sleeve 114 are installed in a cavity on the coil assembly, and the positioning ring 106 of the magnetically conductive inner sleeve (see Fig. 4) in the hole in the coil stand 104 defines the upper magnetically conductive inner sleeve 113 and the lower magnetically conductive inner sleeve 114 in a position allowing contact with the magnetic yoke 111; then, the positioning grooves 112 of the yoke 111 engage with the yoke positioning protrusions 105 on the upper and lower end surfaces of the spool stand 104, whereby the yoke 111 is positioned on the spool stand 104 on one side, and closely contacts and connects with the upper and lower magnetically conductive inner sleeves. 113 and 114 on the other hand, thus forming the stator assembly 102 shown in FIG. 6.

Compared with the prior art, the invention makes it possible to shorten the welding process of the yoke 111 with the upper and lower magnetically conductive inner sleeves, and can reduce one yoke. However, in the prior art, it is necessary to weld the upper magnetically conductive inner sleeve to one yoke, weld the lower magnetically conductive inner sleeve to the other yoke, and then butt-join the two yokes (quality problems may arise in that a butt joint cannot be achieved). Thus, according to the invention, the number of steps can be reduced, the cost can be reduced, and the quality of the product can be improved.

In the invention, the stator assembly 102 is used as a base or insert, and plastic is injected onto the stator assembly 100 using a waterproofing sleeve:

by placing the stator assembly 102 shown in FIG. 6 into the mold and injecting the plastic for the first time, the coil winding 109, the yoke 111 and the electronic component 108 are wrapped in plastic, but the insert 107 and the hole in the coil post 125 with the upper conductive inner sleeve 113 and the lower conductive inner sleeve 114 are exposed, forming, thus, the plastic seal main assembly 101 shown in FIG. 7 and 8;

by putting the plastic seal main assembly 101 into another mold and injecting the plastic a second time, a water-insulating sleeve 117 with an upper magnetically conductive inner sleeve 113 and a lower magnetically conductive inner sleeve 114 is formed on the hole of the coil stand 125 to make an integrated stator assembly 100 c waterproof sleeve, as shown in Fig. 10 and 11.

In FIG. 11 shows the construction of an integrated stator assembly 100 with a water stop. The yoke 111 is tightly attached to the coil assembly 103 with the plastic sealing layer 116, and the water-insulating sleeve 117 is injection-molded on the inner walls of the upper and lower conductive inner sleeves 113 and 114, whereby the water-insulating sleeve 117, having a thickness of about 0.5 mm, formed in the opening of the reel stand, that is, the invention reduces the thickness of the waterproofing sleeve 117 through the plastic injection process. The invention can significantly reduce the gap between the movable iron core 201 and the magnetically conductive inner sleeve, and increase the electromagnetic force acting on the movable iron core 201, compared with the 1.7 mm thick waterproofing sleeve in the prior art.

In addition, in the second plastic injection process, the base 118 of the water bushing having the male thread is also injection molded, whereby the integrated stator assembly 100 having the water bushing can be screwed onto the valve body 205 having the female thread when assembling the solenoid water valve, see fig. eleven.

Then, the conductive seat 121 is fitted inside the upper conductive inner sleeve 113 to form the plastic sealed stator assembly shown in FIG. four.

In FIG. 9a-9d show the construction of the upper and lower conductive inner sleeves according to the invention. The upper magnetically conductive inner sleeve 113 and the lower magnetically conductive inner sleeve 114 according to the invention are made cylindrical, and a radial through hole 115 is made in their walls for the passage of glue, while the inner surface of the cylindrical wall is provided with an axial groove 122 of the magnetically conductive inner sleeve (to facilitate the flow of hot molten plastic when plastic injection), and the axial groove 122 of the magnetically conductive inner sleeve communicates with the radial through hole 115. By injecting plastic into the hole of the coil stand having upper and lower magnetically conductive inner sleeves, the injected plastic used to form the waterproofing sleeve flows through the axial grooves 122 of the upper and the lower magnetically conductive inner sleeves into the magnetically conductive inner sleeve through the hole 115, forming a root portion for positioning the water bushing 117, whereby the water bushing 117 pro directly attached to the upper and lower conductive inner sleeves 113, 114, which have been positioned by the positioning ring 106 of the magnetically conductive inner sleeve.

In addition, the invention may further provide a plurality of circumferential grooves (not shown) on the inner surfaces of the upper and lower conductive inner sleeves 113 and 114 to further secure the water sleeve using radial grooves when the water sleeve is sealed with plastic.

In FIG. 12-14 illustrate another embodiment of the invention for forming a water barrier. First, the upper conductive inner sleeve 113, the stopper 106, and the lower conductive inner sleeve 114 are placed together (as shown in FIG. 12). Second, the upper conductive inner sleeve 113, the stopper 106, and the lower conductive inner sleeve 114, which are placed together, are used as plastic injection inserts in order to manufacture a water-insulating sleeve assembly including a water-insulating sleeve formed inside the upper magnetically conductive inner sleeve. and the lower conductive inner sleeve (see Fig. 13 and 14). Then, the waterproof sleeve assembly is installed in the hole in the coil assembly, and a plastic injection process is performed, thereby forming a plastic sealed stator assembly as shown in FIG. four.

Compared with the technology of "injection molding of the upper and lower magnetically conductive inner sleeves in the form of inserts together with the water jacket and the coil body", the method of making the water inlet solenoid valve according to the invention can greatly reduce the operating air gap, since the water insulating sleeve according to the invention is formed with by injecting plastic into the hole of the coil assembly, whereby a very thin waterproof sleeve can be formed. The technology of "injection molding of the upper and lower conductive inner sleeves in the form of inserts together with the water jacket and coil body" is that "the magnetic inner sleeve, water jacket and coil body are injection molded as an integrated part", so it is necessary to produce a separate water jacket, coil stand and magnetic inner sleeve; taking into account factors such as manufacturing process and strength, the water jacket must have a certain thickness so that its thickness is greater than that of the waterproof sleeve according to the invention, the plastic of which is injected into the opening of the reel stand. In addition, the technology of "injection molding of the upper and lower magnetic inner sleeves in the form of inserts together with the water jacket and coil body" does not allow the yoke, coil winding, insert, coil post, magnetic inner sleeve and water-insulating sleeve to be packaged together to form an integrated stator node.

The invention also provides a solenoid valve for water with an increase in electromagnetic suction force, made according to the above method, which contains:

stator assembly with plastic seal;

a valve body assembly comprising a movable iron core for assembly with a plastic sealed stator assembly to form a water solenoid valve;

as shown in FIG. 3, a plastic sealed stator assembly according to the invention comprises: a coil assembly having a coil stand 104, a coil winding 109 wound around the coil stand 104, an insert 107, and an electronic component 108 mounted on the coil stand 104 (see FIG. 5). ); an upper conductive inner sleeve 113 and a lower conductive inner sleeve 114 installed in the opening of the coil assembly; a waterproof sleeve 117 located inside the upper conductive inner sleeve 113 and the lower conductive inner sleeve 114; a yoke 111 located outside the coil assembly and connecting the upper magnetically conductive inner sleeve 113 and the lower magnetically conductive inner sleeve 114; a magnetically conductive saddle 121 installed inside the upper waterproof sleeve 117; and a plastic sealing layer 116 covering the spool assembly and yoke 111.

According to the invention, the upper end surface of the movable iron core 201 in the initial position is set not lower than the upper edge of the lower magnetically conductive inner sleeve 114 and not higher than 1/4 of the distance from the upper edge of the lower magnetically conductive inner sleeve 114 to the lower edge of the upper magnetically conductive inner sleeve 113 to increase the solenoid suction force of the solenoid valve for water.

As shown in FIG. 3, the body assembly of the solenoid valve for water according to the invention includes: a return spring 200 and a movable iron core 201, which are housed in a water-insulating sleeve; flow port valve plug rubber 202; valve plug 203; rubber 204 valve plugs; valve body 205, mounting post 206, pressure relief ring 207, rubber gasket 208 and filter screen assembly 209, etc.

According to the invention, the upper end surface of the movable iron core in the initial position is set not lower than the upper edge of the lower magnetically conductive inner sleeve, and not higher than 1/4 of the distance from the upper edge of the lower magnetically conductive inner sleeve to the lower edge of the upper magnetically conductive inner sleeve in order to increase the electromagnetic suction force solenoid valve for water.

According to the invention, by setting the length of the movable iron core in the lower conductive inner sleeve at the initial position to not less than 1/4 of the sum of the heights of the upper conductive inner sleeve and the lower conductive inner sleeve, in order to ensure that the magnetic conductivity of the non-operating air gap is not too small, magnetic interference is prevented. saturation of the iron core and improves the ability of the water solenoid valve to withstand the impact of large impulse current.

The specific parameters of the invention for achieving the above-mentioned improvement in the structure of the magnetic circuit include: the gap between the upper and lower magnetically conductive inner sleeves is 2 mm to 5 mm; the diameter of the movable iron core is reduced from 6 mm to 5 ± 0.1 mm; the inner diameter of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 6.5 ± 0.1 mm, the wall thickness is 1 mm, the outer diameter is 8.5 ± 0.1 mm; the inner diameter of the waterproof sleeve is 5.5 ± 0.1 mm, the outer diameter is 6.5 ± 0.1 mm; and the weight of the conductive seat is not less than 60% of the weight of the movable iron core, so as to properly enlarge the conductive seat, increase the electromagnetic suction force, and improve the suction reliability of the valve.

In addition, according to the invention, the water insulating sleeve inside the upper and lower magnetically conductive inner sleeves is formed by injecting plastic on the inner surfaces of the upper and lower magnetically conductive inner sleeves.

Alternatively, the invention may also place the upper magnetic inner sleeve, the stopper and the lower magnetic inner sleeve together as an insert and injection mold them to form a water-insulating sleeve assembly that fits into the bore of the coil assembly and includes a water-insulating sleeve formed with by injection molding on the inner surfaces of the upper magnetic inner sleeve and the lower magnetic inner sleeve.

On the other hand, the upper magnetically conductive inner sleeve 113 and the lower magnetically conductive inner sleeve 114 according to the invention are cylindrical, and their wall is provided with a radial through hole 115 for the passage of glue, the inner surface of their wall is provided with an axial groove 122 of the magnetically conductive inner sleeve, and the axial groove 122 of the magnetically conductive inner bushing communicates with the radial through hole 115. By injecting plastic into the opening of the coil post having upper and lower conductive inner bushings, the injected plastic used to form the water-insulating bushing flows along the axial grooves 122 of the upper and lower conductive inner bushings into the conductive inner bushing through hole 115, forming a root portion for positioning the injection-molded waterproofing sleeve 117.

According to the inventor's experimental study, the magnetic circuit structure of the water solenoid valve is designed to be sized so that without affecting the low pressure starting performance of the valve, the consumables can be reduced and the cost can also be reduced. The diameter of the movable iron core is reduced from 6 mm to 5 ± 0.1 mm; The inner diameter of the waterproof sleeve is 5.5±0.1mm, the wall thickness is 0.5mm, the outer diameter is 6.5±0.1mm; the inner diameter of the upper and lower magnetically conductive inner bushings is 6.5 ± 0.1 mm, the wall thickness is 1 mm, the outer diameter is 8.5 ± 0.1 mm; the opening of the hole in the coil stand is about 8.7 mm.

Since the water bushing vibrates due to the action of the movable iron core during valve operation, the coil stand must meet certain rigidity requirements to prevent damage. According to the provisions of GB14536.1-2008 "Household and similar electric automatic electric regulators" and GB 4706.1-2005 "Household and similar electrical appliances safety", the magnetic yoke of the water inlet valve is open and accessible for human manual manipulation. To meet the insulation requirements, the frame wall thickness must be greater than 0.7 mm. The magnetic yoke of the water inlet valve according to the invention has a plastic seal that cannot be touched by human hands, and the frame does not require thickness, and it is only necessary to provide strength so that it does not deform when wound, whereby the thickness of the frame can be minimized.

Since the invention uses the injection molding process of the water bushing, this water bushing is formed by injection of plastic into the stator assembly and integrated with the coil post, and the wall thickness of the coil leg is not limited to the national standard, the wall thickness of the hole in the coil leg is reduced from 1mm to 0 .4 mm, whereby the diameter of the coil is further reduced, and the amount of copper wire is further reduced, provided that the number of turns of the winding and the diameter of the wire are unchanged.

In addition, as the movable iron core becomes smaller and lighter when the coil winding 109 is energized, the noise generated by the attraction between the magnetized magnetic seat 121 and the movable iron core 201 also decreases.

It should be noted that the injection molding process of the water seal used in the water solenoid valve according to the embodiment of the invention is only an explanation of the manufacturing process of the water solenoid valve, and does not limit the structure of the magnetic circuit. The method of improving the structure of the magnetic circuit according to the invention is effective for all solenoid valves for water in terms of increasing the attraction force of the solenoid at start-up, reduces the wire consumption and reduces the noise generated by the suction movement of the iron core, provided that the minimum requirements for starting voltage are met.

Although the invention has been described in detail above, the invention is not limited thereto, and various modifications may be made by a person skilled in the art in accordance with the principles of the invention. Thus, it should be understood that modifications made in accordance with the principles of the invention are included in the scope of the invention.

Claims (69)

1. A method for making a solenoid valve for water capable of increasing electromagnetic suction force, including the steps of: a stator assembly with a plastic seal is obtained by injecting plastic onto the stator assembly, the stator assembly with a plastic seal comprising: coil unit; an upper magnetically conductive inner sleeve and a lower magnetically conductive inner sleeve installed in the hole of the coil assembly; a waterproofing sleeve located inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve; a yoke located outside the coil assembly and connecting the upper magnetically conductive inner bushings and the lower magnetically conductive inner bushings; a magnetically conductive saddle mounted on the inside of the waterproof sleeve; as well as a plastic sealing layer covering the coil assembly and the yoke; assembling together the stator assembly with the plastic seal and the valve body assembly containing the movable iron core to form a water solenoid valve; at the same time, the upper end surface of the movable iron core in the initial position is set not lower than the upper edge of the lower magnetically conductive inner sleeve, and not higher than 1/4 of the distance from the upper edge of the lower magnetically conductive inner sleeve to the lower edge of the upper magnetically conductive inner sleeve in order to increase the electromagnetic suction force solenoid valve for water. 2. The method according to claim 1, wherein the length of the movable iron core in the lower magnetically conductive inner sleeve in the initial position is set to a value of not less than 1/4 of the sum of the heights of the upper and lower magnetically conductive inner sleeves, so that the core material can be saved. 3. The method according to claim. 1 or 2, in which the gap between the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 2-5 mm; the diameter of the movable iron core is reduced from 6 mm to 5 ± 0.1 mm; the inner diameter of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 6.5 ± 0.1 mm, the wall thickness is 1 mm, the outer diameter is 8.5 ± 0.1 mm; the waterproof sleeve has an inner diameter of 5.5 ± 0.1 mm and an outer diameter of 6.5 ± 0.1 mm; and the weight of the magnetically conductive seat is not less than 60% of the weight of the movable iron core. 4. The method according to claim 2, wherein plastic is injected onto the inner sides of the upper magnetic inner sleeve and the lower magnetic inner sleeve installed in the coil assembly to form a waterproof sleeve on the inner sides of the upper magnetic inner sleeve and the lower magnetic inner sleeve. 5. The method according to claim 2, wherein the waterproofing sleeve assembly, comprising a waterproofing sleeve formed inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve, is made by injecting plastic on the upper magnetically conductive inner sleeve, the stopper and the lower magnetically conductive inner sleeve, placed together in the form of an insert; then, a water-insulating bushing assembly is installed in the hole of the coil assembly and injection of plastic is carried out. 6. The method according to claim 4 or 5, wherein the upper conductive inner sleeve and the lower conductive inner sleeve are cylindrical, and the wall of the cylinder is provided with radial through holes for the passage of adhesive. 7. The method according to claim 6, in which on the inner surfaces of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve, axial grooves of the magnetically conductive inner sleeve are made, communicating with the radial through holes. 8. The method according to claim 7, in which, when the plastic is injected into the hole of the coil stand provided with the upper magnetic inner sleeve and the lower magnetic inner sleeve, the injected plastic used to form the water-insulating sleeve flows into the radial through hole along the axial grooves of the magnetically conductive inner sleeve, thus forming the root part for fastening the waterproof sleeve. 9. A solenoid valve for water capable of increasing the electromagnetic suction force, comprising: a stator assembly with a plastic seal, comprising: coil unit; an upper magnetically conductive inner sleeve and a lower magnetically conductive inner sleeve installed in the hole of the coil assembly; a waterproofing sleeve located inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve; a yoke located outside the coil assembly and connecting the upper magnetically conductive inner bushings and the lower magnetically conductive inner bushings; a magnetically conductive saddle mounted on the inside of the waterproof sleeve; as well as a plastic sealing layer covering the cap assembly and yoke; a valve body assembly comprising a movable iron core for assembly with a stator assembly with a plastic seal to form a solenoid valve for water; at the same time, the upper end surface of the movable iron core in the initial position is installed not lower than the upper edge of the lower magnetically conductive inner sleeve and not higher than 1/4 of the distance from the upper edge of the lower magnetically conductive inner sleeve to the lower edge of the upper magnetically conductive inner sleeve in order to increase the electromagnetic suction force of the solenoid water valve. 10. The solenoid valve for water according to claim 9, in which the length of the movable iron core in the lower magnetically conductive inner sleeve in the initial position is set to a value of not less than 1/4 of the sum of the heights of the upper and lower magnetically conductive inner sleeves. 11. Solenoid valve for water according to claim 9 or 10, in which the gap between the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 2 mm - 5 mm; the diameter of the movable iron core is reduced from 6 mm to 5 ± 0.1 mm; the inner diameter of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is 6.5 ± 0.1 mm, the wall thickness is 1 mm, the outer diameter is 8.5 ± 0.1 mm; the waterproof sleeve has an inner diameter of 5.5 ± 0.1 mm and an outer diameter of 6.5 ± 0.1 mm; and the weight of the magnetically conductive seat is not less than 60% of the weight of the movable iron core. 12. The solenoid valve for water according to claim 9 or 10, in which the injection of plastic is carried out on the inner sides of the upper magnetic inner sleeve and the lower magnetic inner sleeve, which are installed in the coil assembly so as to form a water-insulating sleeve on the inner sides of the upper magnetic inner sleeve and lower magnetic inner sleeve. 13. The solenoid valve for water according to claim. 9 or 10, in which the water-insulating sleeve assembly containing the water-insulating sleeve formed inside the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve is made by injecting plastic onto the upper magnetically conductive inner sleeve, the stopper and the lower magnetically conductive inner a sleeve placed together as an insert; then the water-insulating sleeve assembly is installed in the hole of the coil assembly. 14. The solenoid valve for water according to claim 12 or 13, wherein the upper conductive inner sleeve and the lower conductive inner sleeve are shaped like a cylinder, and the wall of the cylinder is provided with radial through holes for passage of adhesive. 15. The solenoid valve for water according to claim 14, wherein the inner surfaces of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve are provided with axial grooves of the magnetically conductive inner sleeve communicating with the radial through holes. 16. The solenoid valve for water according to claim 15, wherein by injecting the plastic into the hole of the coil stand provided with the upper magnetic inner sleeve and the lower magnetic inner sleeve, the injected plastic used to form the water insulating sleeve flows into the radial through hole along the axial grooves of the magnetically conductive inner sleeve, thus forming a root part for attaching the waterproofing sleeve. 17. A method for making a stator assembly with a water insulating sleeve applied to a solenoid valve for water, including the steps of: forming a coil assembly (103) with a cavity by installing an element including an insert (107) on a coil stand (104) wound with a coil winding (109); a stator assembly (102) is formed by installing the upper magnetically conductive inner sleeve (113) and the lower magnetically conductive inner sleeve (114) on both sides in the hole (125) in the coil post of the coil assembly (103), and attach the yoke connecting the upper magnetically conductive inner sleeve ( 113) and a lower magnetically conductive inner sleeve (114) outside the coil assembly (103); plastic is injected onto the stator assembly (102) to form a stator assembly (100) with a waterproof bushing. 18. The method of claim 17, wherein the step of injecting plastic onto the stator assembly (102) to form the stator assembly (100) with the waterproofing sleeve includes: by injecting plastic onto the stator assembly (102), covering the coil winding (109) and the yoke (111) with plastic, leaving the insert (107) and hole (125) in the coil post exposed, thus producing the main stator assembly (101) with a plastic seal ; by injecting plastic into the main stator assembly (101) with a plastic seal, forming a water insulating sleeve (117) in the hole (125) of the coil stand with an upper magnetically conductive inner sleeve (113) and a lower magnetically conductive inner sleeve (114), thus making a stator assembly ( 100) with waterproof sleeve. 19. The method of claim 18, wherein the opening (125) of the coil post has a positioning ring of the magnetically conductive inner sleeve for positioning the upper magnetically conductive inner sleeve (113) and the lower magnetically conductive inner sleeve (114) so as to keep the upper magnetically conductive inner sleeve (113) and a lower conductive inner sleeve (114) at a predetermined distance in the opening of the coil stand. 20. The method according to claim 18, in which, simultaneously with the injection of plastic into the main stator assembly (101) with a plastic seal, a water-insulating base (118) is formed, located at the lower end of the water-insulating sleeve (117), which is used to connect and fasten the body assembly of the solenoid water valve. 21. A method for making a stator assembly with a water insulating sleeve applied to a solenoid valve for water, including the steps of: forming a waterproof sleeve assembly (300) with a magnetically conductive sleeve by injecting plastic into the upper magnetically conductive inner sleeve (113), the stopper (106) and the lower magnetically conductive inner sleeve (114) to form the waterproofing sleeve (117); a coil assembly (103) is formed by installing an element including an insert (107) on a coil stand (104) wound with a coil winding (109) and attaching a yoke (111) connecting the upper magnetically conductive inner sleeve (113) and the lower magnetically conductive an inner sleeve (114) outside the coil assembly (103); inserting the waterproof sleeve assembly (300) with the magnetically conductive sleeve into the hole (125) of the coil post of the coil assembly (103) to form the stator assembly; a stator assembly (100) is made with a waterproofing sleeve by injecting plastic into the stator assembly to cover the coil winding and the yoke on the stator assembly. 22. The method of claim 21, wherein the waterproof sleeve assembly (300) comprises: an upper conductive inner sleeve (113), a stopper (106), and a lower conductive inner sleeve (114), which are bonded together by injection of plastic; a waterproof sleeve (117) formed on the inner surfaces of the upper magnetically conductive inner sleeve (113), stopper (106), and lower magnetically conductive inner sleeve (114) by injection of plastic; the base (118) of the waterproofing sleeve, located at the lower end of the waterproofing sleeve (117) and made with it in one piece. 23. The method according to any one of paragraphs. 17-22, in which the upper magnetically conductive inner sleeve (113) and the lower magnetically conductive inner sleeve (114), respectively, are a cylinder, and the walls of the cylinder are provided with radial through holes (115) through which glue flows. 24. The method of claim 23, wherein the inner surfaces of the upper conductive inner sleeve (113) and the lower conductive inner sleeve (114) are provided with axial grooves (122) communicating with the radial through holes (115). 25. The method of claim 24, wherein the inner surfaces of the upper and lower conductive inner sleeves are provided with circumferential grooves (122') that communicate with the axial grooves. 26. The method according to claim 24 or 25, in which by injecting plastic on the inner surfaces of the upper magnetic inner sleeve (113) and the lower magnetic inner sleeve (114), a waterproofing sleeve (117) and a base (118) of the waterproofing sleeve are formed; during plastic injection, hot molten plastic flows into the radial through hole (115) of the magnetically conductive inner sleeve along the axial grooves (122) of the upper magnetically conductive inner sleeve (113) and the lower magnetically conductive inner sleeve (114), forming a root part for attaching the injection water jacket. 27. A stator assembly (100) with a water insulating sleeve applied to a solenoid valve for water, comprising: a coil assembly (103) comprising a coil stand (104), a coil winding (109) wound on the coil stand (104), and an insert (107) located on the coil stand (104), wherein the opening (125) of the coil stand is formed in the middle of the rack (104) of the coil; an upper magnetically conductive inner sleeve (113), a lower magnetically conductive inner sleeve (114), and a water-insulating sleeve (117), which are located in the hole (125) of the coil stand, while the water-insulating sleeve (117) is formed by injection of plastic on the inner surfaces of the upper magnetically conductive inner sleeve (113) and lower conductive inner sleeve (114); a yoke (111) located outside the coil assembly, with the upper end and lower end of the yoke (111) closely connected to the upper magnetically conductive inner sleeve (113) and the lower magnetically conductive inner sleeve (114), respectively; a plastic sealing layer (116) covering the coil assembly formed by injection of plastic, while the plastic sealing layer (116) does not cover the part of the insert (107) electrically connected to an external power supply. 28. The stator assembly according to claim 27, in which the lower end of the waterproofing sleeve (117) is provided with a base (118) of the waterproofing sleeve, made in one piece by injection of plastic, while the base (118) of the waterproofing sleeve is not covered with a plastic sealing layer (116) to connect and fasten to the body of the solenoid water inlet valve. 29. The stator assembly according to claim 27, wherein the positioning groove (112) of the yoke (111) clamps the protrusions (105) of the yoke positioning made on the upper and lower end surfaces of the rack (104) of the coil, as a result of which the yoke (111) is positioned on column (104) of the coil on one side and connected to the upper magnetically conductive inner sleeve (113) on the other side. 30. The stator assembly according to claim 27, in which the upper magnetically conductive inner sleeve (113) and the lower magnetically conductive inner sleeve (114) are cylindrical, and both of them are provided with locking structures of the water insulating sleeve for attaching the water insulating sleeve (117) to the inner surfaces of the upper magnetically conductive inner bushing (113) and lower conductive inner bushing (114). 31. A stator assembly as claimed in claim 30, wherein the retaining structure of the waterproofing sleeve comprises a radial through hole (115) through which adhesive flows. 32. The stator assembly according to claim 30, in which the locking structure of the water-insulating sleeve further comprises grooves made on the inner surfaces of the upper magnetically conductive inner sleeve and the lower magnetically conductive inner sleeve. 33. Stator assembly according to claim 32, wherein the groove comprises an axial groove (122) communicating with the radial through hole (115). 34. The stator assembly of claim 33, wherein the groove comprises a circumferential groove in communication with the axial groove. 35. The solenoid valve for water, containing the valve body assembly and the stator assembly with a water insulating sleeve (100) according to any one of paragraphs. 27-34, wherein the stator assembly with the water seal (100) is assembled together with the valve body assembly to form a solenoid valve for water.

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