CN113623456A

CN113623456A - Electromagnetic valve and control method thereof

Info

Publication number: CN113623456A
Application number: CN202110864062.7A
Authority: CN
Inventors: 张松根; 苏玮鸿; 洪加明
Original assignee: XIAMEN OLT CO Ltd
Current assignee: XIAMEN OLT CO Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-11-09
Anticipated expiration: 2041-07-29
Also published as: CN113623456B

Abstract

The present invention provides a solenoid valve and a control method thereof, the solenoid valve including: the valve comprises a valve seat, a first valve body and a second valve body; the first valve body and the second valve body are connected to the valve seat in parallel; one end of the valve seat is provided with a water inlet, the other end of the valve seat is provided with a water outlet, and a first tubular column and a second tubular column with openings at the top ends are respectively arranged in the valve seat; the peripheries of the first pipe column and the second pipe column and the inner wall of the valve seat respectively form a first water passing area and a second water passing area; the water inlet, the first water passing area, the first pipe column top end opening, the second water passing area, the second pipe column top end opening and the water outlet are communicated in sequence; a first through hole is formed in the side wall of the first pipe column; when the first valve body is closed and the second valve body is opened, the water inlet, the first water passing area, the first through hole, the second water passing area, the second pipe column top end opening and the water outlet are communicated in sequence.

Description

Electromagnetic valve and control method thereof

Technical Field

The invention relates to the technical field of valves, in particular to an electromagnetic valve and a control method thereof.

Background

The solenoid valve is a valve control device that is electromagnetically controlled. The electromagnetic valve is used to control the flow direction, flow rate and other parameters of fluid such as water, gas, hydraulic oil and the like, and is an automatic element for controlling the fluid. The variety of solenoid valves is wide, and different types of solenoid valves often have different functions. Common electromagnetic valves include water electromagnetic valves, gas electromagnetic valves, hydraulic electromagnetic valves, pulse electromagnetic valves, direct current electromagnetic valves, and the like.

The phenomenon of water hammer effect can exist when the valve switch closes the water route, and water hammer effect damages water route pipeline and valve switch easily, reduces valve switch's life. The existing electromagnetic valve is often used for reducing the adverse effect caused by the water hammer effect by delaying the water closing time. When the water is turned off in a delayed mode, the water pressure in the valve body can be gradually reduced, and therefore the water hammer effect is eliminated. Although the water hammer effect can be eliminated by delaying water shut-off, the waste of water resources is undoubtedly caused, and the water saving is not facilitated. It is therefore particularly important to provide a solenoid valve that eliminates the water hammer effect and reduces the delay in closing the valve.

Disclosure of Invention

The invention provides an electromagnetic valve and a shower column, which can effectively solve the problems.

The invention is realized by the following steps: a solenoid valve, comprising: the valve comprises a valve seat, a first valve body and a second valve body; wherein the first valve body and the second valve body are connected in parallel to the valve seat;

one end of the valve seat is provided with a water inlet, the other end of the valve seat is provided with a water outlet, and a first tubular column and a second tubular column with openings at the top ends are respectively arranged in the valve seat; the peripheries of the first pipe column and the second pipe column and the inner wall of the valve seat form a first water passing area and a second water passing area respectively; the water inlet, the first water passing area, the first pipe column top end opening, the second water passing area, the second pipe column top end opening and the water outlet are communicated in sequence; wherein the content of the first and second substances,

a first through hole is formed in the side wall of the first pipe column; when the first valve body is closed and the second valve body is opened, the water inlet, the first water passing area, the first through hole, the second water passing area, the second pipe column top end opening and the water outlet are communicated in sequence.

As a further improvement, the side wall of the first pipe column is provided with a first communicating hole, and the second water passing area is communicated with the top end opening of the second pipe column and the first communicating hole.

As a further improvement, a second communication hole is formed in the inner wall of the second pipe column and communicated with the water outlet.

As a further improvement, a first diaphragm is arranged at the bottom end of the first valve body, and the first diaphragm blocks or opens the opening at the top end of the first pipe column.

As a further improvement, a first hole column is arranged in the first valve body, and the first diaphragm is sleeved on the periphery of the first hole column; and a first balance hole is arranged on the first diaphragm and is communicated with the first hole column and the first water passing area.

As a further improvement, a second diaphragm is arranged at the bottom end of the second valve body, and the second diaphragm blocks or opens the top end opening of the second pipe column.

As a further improvement, a second hole column is arranged in the second valve body, and the second diaphragm is sleeved on the periphery of the second hole column; and a second balance hole is formed in the second diaphragm and communicated with the second hole column and the second water passing area.

As a further improvement, the aperture of the first through hole is 1-5 mm.

The present invention also provides a control method of a solenoid valve, which is applied to the solenoid valve described above, the control method including:

the starting method comprises the following steps: opening the first valve body, wherein fluid flows in from the water inlet and flows into the second water passing area from the first through hole and the top end opening of the first pipe column respectively; opening the second valve body, and enabling the fluid to flow into the second communication hole from the top end opening of the second pipe column and flow into the water outlet from the second communication hole;

the closing method comprises the following steps: closing the first valve body, and enabling the fluid to flow into the second water through area from the first through hole and flow into a water outlet from an opening at the top end of the second pipe column; and when the second valve body is closed, the second diaphragm is abutted against the opening at the top end of the second pipe column, and the fluid cannot circulate.

The invention has the beneficial effects that:

one is as follows: the electromagnetic valve comprises a valve seat and two valve bodies, wherein the two valve bodies are respectively arranged on the valve seat. Two pipe columns are arranged in the valve seat, and the two valve bodies are respectively blocked or opened at the top end openings of the pipe columns. Wherein, be equipped with first through-hole on first tubular column. According to the invention, normal water supply can be realized after the first valve body and the second valve body are opened; when the valve body is closed, the first valve body is closed firstly, so that the large water flow at the top end of the first pipe column is closed, and the water flow flows through the first through hole on the first pipe column. At the moment, the large water flow is changed into the small water flow, and the water pressure is reduced; and closing the second valve body, wherein the diaphragm in the second valve body abuts against the top end opening of the second pipe column, so that the electromagnetic valve is closed. Through set up first through-hole on first tubular column, can realize the little rivers of big rivers change when closing the valve, effectively eliminate the water hammer effect to it is long when reducing the valve of closing, thereby avoids extravagant water resource. The valve seat has simple structure, the first through hole is skillfully designed, the water hammer is effectively eliminated, the valve closing time is shortened, and the water is saved.

The second step is as follows: the two valve bodies arranged on the valve seat can be connected in series, such as a first valve body and a second valve body; or may be connected in parallel, such as a first valve body and a third valve body. The series connection and the parallel connection can be suitable for different occasions, so that the electromagnetic valve has wide applicability and is convenient to use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a solenoid valve provided in embodiment 1 of the present invention.

Fig. 2 is a sectional view a-a according to fig. 1.

Fig. 3 is a schematic view of a valve seat structure provided in embodiment 1 of the present invention.

Fig. 4 is a sectional view according to B-B of fig. 3.

Fig. 5 is a schematic structural view of a valve seat according to embodiment 1 of the present invention, in which a first through hole is located at the top end.

Fig. 6 is a schematic structural diagram of a solenoid valve provided in embodiment 2 of the present invention.

Fig. 7 is a schematic view of the C-C cut according to fig. 6.

Fig. 8 is a schematic view of a valve seat structure provided in embodiment 2 of the present invention.

Fig. 9 is a schematic view of the cut-away D-D according to fig. 8.

The figures in the drawings are identified as:

1. a valve seat;

11. a water inlet; 12. a water outlet;

13. a first tubular string; 131. a first through hole; 132. a first communication hole;

14. a second tubular string; 141. a second communication hole;

15. a third tubular string;

151. a second through hole; 152. a third through hole; 153. a third communication hole;

2. a first valve body;

21. a first diaphragm; 211. a first balance hole; 22. a first bore post; 23. a first iron core;

3. a second valve body;

31. a second diaphragm; 311. a second balance hole; 32. a second bore; 33. a second iron core;

4. a first water passage area;

5. a second water passage area;

6. a third valve body; 61. a third iron core;

7. and a third water passing area.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The electromagnetic valve has wide application scenes, and is commonly used in the fields of household induction faucets, toilets and other household bathrooms. The existing electromagnetic valve usually eliminates the influence of water hammer effect by delaying the valve closing time, but the delaying of valve closing necessarily causes waste of water resources. The electromagnetic valve used in the long term will undoubtedly cause a great deal of water resource waste. When the electromagnetic valve provided by the embodiment of the invention is closed, one valve body is closed firstly, large water flow in the electromagnetic valve is changed into small water flow, and then the second valve body is closed, so that the electromagnetic valve is closed. Not only eliminates the influence of water hammer, but also shortens the valve closing time and saves water.

Example 1

As shown in fig. 1, embodiment 1 of the present invention provides a solenoid valve including: a valve seat 1, a first valve body 2, and a second valve body 3; wherein the first valve body 2 and the second valve body 3 are respectively connected to the valve seat 1. Specifically, the first valve body 2 and the second valve body 3 in this embodiment are both pilot-operated solenoid valves. Two openings are respectively arranged on the upper side surface of the valve seat 1, and the valve cores of the first valve body 2 and the second valve body 3 respectively penetrate through the openings on the valve seat 1 and extend into the valve seat 1. The first valve element 2 and the second valve element 3 may be connected to the valve seat 1 by any one of fixed connection, hinge connection, pin connection, abutment, screw connection, and the like, but not limited thereto. The first valve body 2 and the second valve body 3 in this embodiment may be disposed on the same side surface of the valve seat 1, or may be disposed on the upper side surface and the lower side surface of the valve seat 1, respectively.

Further, as shown in fig. 2, the valve seat 1 of the present embodiment has a water inlet 11 at one end and a water outlet 12 at the other end. Meanwhile, a first stem 13 and a second stem 14, which are open at the top ends, are provided in the valve seat 1, respectively. The first 13 and second 14 limbs are open at the top and closed at the bottom. When the first valve body 2 and the second valve body 3 are arranged on the valve seat 1, the bottom end of the first valve body 2 blocks or opens the top end opening of the first pipe column 13; the bottom end of the second valve body 3 blocks or opens the top end opening of the second pipe column 14.

Further, as shown in fig. 3 and 4, the sidewall of the first tubular column 13 in this embodiment is provided with a first through hole 131; one or more through holes 131 may be provided. The first through hole 131 may be provided on both the side wall of the first stem 13 and the top end of the first stem 13. I.e. a notch is formed in the top end of the first tubular leg 13, as shown in fig. 5. The aperture of the first through hole 131 in this embodiment is 1-5 mm. Preferably, one first through hole 131 is provided in the present embodiment, and the aperture of the first through hole 131 is preferably 3 mm. When the diameter of the first through-hole 131 is less than 1mm, the amount of water passing through the first through-hole 131 is very small. At this time, if the first through hole 131 having a small water passage aperture is likely to generate a water hammer effect in the solenoid valve when the first valve body 2 is closed, the effect of eliminating the water hammer effect by using the solenoid valve in the present embodiment cannot be achieved. When the diameter of the first through-hole 131 is greater than 5mm, the water flow still has a large water flow impact force when passing through the first through-hole 131 of a larger diameter after the first valve body 2 is closed. In this case, even when the second valve body 3 is closed, a certain water hammer effect occurs, and the effect of using the solenoid valve in the present embodiment cannot be optimally exhibited. Therefore, the present embodiment defines the aperture of the first through hole 131 so as to optimally exert the usage effect of the solenoid valve in the present embodiment.

Further, it should be specifically noted that the periphery of the first stem 13 in this embodiment forms a first water passing area 4 with the inner wall of the valve seat 1, as shown in fig. 3. The first water passing area 4 is communicated with the water inlet 11 and the top end opening of the first tubular column 13. The periphery of the second pipe column 14 and the inner wall of the valve seat 1 form a second water through area 5. The first tubular column 13 is further provided with a first communication hole 132 on the side wall. The second water passing area 5 in this embodiment is connected to the top opening of the second tubular string 14 and the first communicating hole 132. The inner wall of the second column 14 is provided with a second communication hole 141, and the second communication hole 141 is communicated with the water outlet 12.

Further, as shown in fig. 2, a first diaphragm 21 is disposed at a bottom end of the first valve body 2 in this embodiment, and the first diaphragm 21 is used for blocking or opening an opening at a top end of the first pipe column 13. A first hole column 22 is arranged in the first valve body 2, and a first balance hole 211 is arranged on the first diaphragm 21; the first balance holes 211 are connected to the first hole pillars 22 and the first water passing region 4. Specifically, a through hole is formed in the middle of the first membrane 21, and the first membrane 21 is sleeved on the periphery of the first hole column 22 through the through hole in the middle. The middle of the first hole column 22 is a water passage, and a first iron core 23 is arranged at the top end of the first hole column 22. And, the juncture of the periphery of the first hole column 22 and the interior of the valve body is provided with a plurality of water through holes. The end of the first iron core 23 is controlled to block or open the water inlet at the top end of the first hole column 22 by controlling the power-on state of the first valve body 2, thereby adjusting the water passing state of the first hole column 22.

Further, the second valve body 3 in this embodiment is provided with a second diaphragm 31 at the bottom end, and the second diaphragm 31 is used for blocking or opening the top end opening of the second pipe column 14. A second hole column 32 is arranged in the second valve body 3, and a second balance hole 311 is arranged on the second diaphragm 31; the second balance holes 311 are connected to the second hole pillars 32 and the second water passing area 5. The second valve body 3 is also provided with a second core 33, as in the first valve body 2. The middle of the second hole column 32 is a water through hole, and a plurality of water through holes are arranged at the junction of the periphery of the second hole column 32 and the inside of the valve body. By controlling the current-carrying state of the second valve body 3, the water inlet at the top end of the second hole pillar 32 can be adjusted to be closed or opened by the end of the second core 33, thereby adjusting the water-carrying state of the second hole pillar 32.

It should be further noted that, when the solenoid valve in this embodiment is implemented, the water flows from the water inlet 11 into the first water passing area 4 in the valve seat 1. After the first valve body 2 is opened, the first iron core 23 is far away from the first hole column 22, and the water inlet at the top end of the first hole column 22 is opened. At this time, a part of the water flows into the first column 13 from the first through hole 131; a part of the water flows from the first balance hole 211 to the upper part of the first diaphragm 21, and flows from the hole on the periphery of the first hole pillar 22 to the inlet above the first hole pillar 22, and then flows from the first hole pillar 22 to the first pipe pillar 13. At this time, the water pressure in the first water passing region 4 is greater than the water pressure in the first diaphragm 21. Under the action of the pressure difference, the first diaphragm 21 elastically moves upward away from the top opening of the first tubular column 13, so that the top opening of the first tubular column 13 is opened, and water flows into the second water passing region 5 from the top opening of the first tubular column 13 with a larger aperture. The second valve body 3 is opened, and the second iron core 33 is far from the top water inlet of the second hole column 32. Similarly, the second diaphragm 31 is away from the top opening of the second stem 14 by the pressure difference, the top opening of the second stem 14 is opened, and the water flows from the top of the second stem 14 into the second communication hole 141 and then out of the water outlet 12. Further, when the electromagnetic valve in this embodiment is opened, the first valve body 2 may be opened first, and then the second valve body 3 may be opened; the first valve body 2 and the second valve body 3 can be opened simultaneously. In the present embodiment, the needle with the needle spring is inserted into the first balance hole 211, and a gap is formed between the inner wall of the first balance hole 211 and the needle with the needle spring, so that water flows through the gap. The second balance holes 311 are designed the same as the first balance holes 211. The first balancing hole 211 is located at the periphery of the first tubular leg 13 and the second balancing hole 311 is located at the periphery of the second tubular leg 14.

When the electromagnetic valve in this embodiment needs to be closed, the first valve body 2 is first closed, and the first iron core 23 blocks the water inlet at the top end of the first bore 22. At this time, the top end of the first hole column 22 is not open, and the water pressure in the first diaphragm 21 is higher than the water pressure in the first water passing region 4. Under the action of the pressure difference, the first diaphragm 31 elastically deforms again to abut against the opening at the top end of the first stem 13, and the opening at the top end of the first stem 13 is closed. At this time, the water flow can flow only into the first tubular string 13 from the first through hole 131 having a smaller bore diameter. The first through hole 131 has a small aperture and a small water flow, so that the water flow flowing out of the water outlet 12 is reduced. When the first valve body 2 is closed firstly, the effect of reducing the large water flow into the small water flow so as to reduce the impact force of the water flow is achieved. Further, at this time, the second valve body 3 is closed again, and the end of the second core 33 abuts against the water inlet of the second hole column 32. Similarly, under the action of the pressure difference, the second diaphragm 31 abuts against the opening of the second stem 14, closing off the second stem 14. At this time, the solenoid valve in this embodiment is completely closed, and the water outlet 12 is no longer in flow communication.

The present embodiment also provides a control method of a solenoid valve, which is applied to the solenoid valve described above, and the control method includes:

the starting method comprises the following steps: the first valve body 2 is opened, and fluid flows in from the water inlet 11 and flows into the second water passing area 5 from the first through hole 131 and the top end opening of the first pipe column 13 respectively; when the second valve body 3 is opened, the fluid flows into the second communication hole 141 from the top end opening of the second stem 14, and flows into the water outlet 12 from the second communication hole 141. It should be noted that, in the present embodiment, there is no priority for opening the first valve body 2 and opening the second valve body 3, and only the first valve body 2 and the second valve body 3 need to be opened to allow water to flow.

The closing method comprises the following steps: when the first valve body 2 is closed, the fluid flows into the second water passing area 5 from the first through hole 131 and flows into the water outlet 12 from the top opening of the second tubular column 14; when the second valve body 3 is closed, the second diaphragm 31 abuts on the top end opening of the second stem 14, and the fluid cannot flow. When the solenoid valve in this embodiment is closed, the first valve body 2 must be closed first, and then the second valve body 3 must be closed. When the first valve body 2 is closed first, the large water flow flowing through the valve seat 1 flows only from the first through hole 131, so that the large water flow is changed into the small water flow.

By applying the electromagnetic valve and the control method of the electromagnetic valve in the embodiment, the water hammer effect can be effectively reduced, water is saved, and the valve closing time is shortened. The average closing time of the electromagnetic valve in the embodiment can be controlled within 0.7s, and the valve closing is not required to be delayed.

Example 2

As shown in fig. 6 and 7, the solenoid valve according to the present embodiment includes a valve seat 1, a first valve body 2, and a third valve body 6. Specifically, the first valve body 2 in this embodiment is connected to the upper end of the valve seat 1, and the third valve body 6 is symmetrically connected to the lower end of the valve seat 1. The first valve seat 1 is a pilot type electromagnetic valve, and the third valve body 6 is a straight-through type electromagnetic valve. Also, only one third stem 15 is provided in the valve seat 1 in the present embodiment.

Further, as shown in fig. 8 and 9, the top end of the third tubular column 15 in this embodiment is provided with an opening, a plurality of second through holes 151 are provided at the joint of the periphery of the bottom end and the valve seat 1, and a third through hole 152 is further provided in the middle of the bottom of the third tubular column 15. Specifically, the periphery of the third pipe column 15 and the inner wall of the valve seat 1 form a third water passing area 7. The third stem 15 is provided at a side wall thereof with a third communication hole 153. The water inlet 11, the third water passing area 7, the second through hole 151, the third through hole 152, the third communicating hole 153 and the water outlet 12 are communicated in sequence. The water inlet 11, the third water passing area 7, the top opening of the third tubular column 15, the third communicating hole 153 and the water outlet 12 are communicated in sequence.

It should be further noted that, when the solenoid valve in this embodiment is used, the first valve body 2 is opened first, so that the first diaphragm 21 is away from the opening at the top end of the third stem 15, and water flows in from the opening at the top end of the third stem 15, and the water flow process is the same as that in embodiment 1. When the third valve body 6 is opened again, the third plunger 61 in the third valve body 6 is far away from the third through hole 152, and the water flows into the third through hole 152 from the second through hole 151, further enters the third communication hole 153, and then flows out from the water outlet 12. Furthermore, the first valve body 2 and the third valve body 6 can be opened simultaneously when the valve is opened, and the same use effect can be achieved.

When the electromagnetic valve in this embodiment is closed, the first valve body 2 is first closed, and the first diaphragm 21 closes the top end opening of the third stem 15. The water flows only from the second through hole 151 having a small diameter and flows into the third communication hole 153 from the third through hole 152, thereby reducing the amount of water flowing into the water outlet 12. Closing the first valve body 2 first can achieve the effect of reducing the large flow to a small flow. Then, the third valve body 6 is closed, and the third iron core 61 is brought into contact with the third through hole 152, thereby closing the third through hole 152. At this time, the water outlet 12 of the solenoid valve is no longer open.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A solenoid valve, comprising:

the valve comprises a valve seat (1), a first valve body (2) and a second valve body (3); wherein the first valve body (2) and the second valve body (3) are connected in parallel to the valve seat (1);

a water inlet (11) is formed in one end of the valve seat (1), a water outlet (12) is formed in the other end of the valve seat, and a first tubular column (13) and a second tubular column (14) with openings at the top ends are respectively arranged in the valve seat (1); the peripheries of the first pipe column (13) and the second pipe column (14) and the inner wall of the valve seat (1) form a first water passing area (4) and a second water passing area (5) respectively; the water inlet (11), the first water passing area (4), the top end opening of the first pipe column (13), the second water passing area (5), the top end opening of the second pipe column (14) and the water outlet (12) are communicated in sequence; wherein the content of the first and second substances,

a first through hole (131) is formed in the side wall of the first pipe column (13); when the first valve body (2) is closed and the second valve body (3) is opened, the water inlet (11), the first water passing area (4), the first through hole (131), the second water passing area (5), the top end opening of the second pipe column (14) and the water outlet (12) are communicated in sequence.

2. The solenoid valve according to claim 1, characterized in that the side wall of the first stem (13) is provided with a first communication hole (132), and the second water passage area (5) is communicated with the top opening of the second stem (14) and the first communication hole (132).

3. The electromagnetic valve according to claim 1, characterized in that the inner wall of the second stem (14) is provided with a second communication hole (141), the second communication hole (141) being communicated with the water outlet (12).

4. The solenoid valve according to claim 1, characterized in that the bottom end of the first valve body (2) is provided with a first diaphragm (21), and the first diaphragm (21) blocks or opens the top end opening of the first pipe column (13).

5. The electromagnetic valve according to claim 4, characterized in that a first hole column (22) is arranged in the first valve body (2), and the first diaphragm (21) is sleeved on the periphery of the first hole column (22); and a first balance hole (211) is arranged on the first diaphragm (21), and the first balance hole (211) is communicated with the first hole column (22) and the first water passing area (4).

6. The solenoid valve according to claim 1, characterized in that the bottom end of the second valve body (3) is provided with a second diaphragm (31), and the second diaphragm (31) blocks or opens the top end opening of the second pipe column (14).

7. The electromagnetic valve according to claim 6, characterized in that a second hole column (32) is arranged in the second valve body (3), and the second diaphragm (31) is sleeved on the periphery of the second hole column (32); and a second balance hole (311) is arranged on the second membrane (31), and the second balance hole (311) is communicated with the second hole column (32) and the second water passing area (5).

8. The solenoid valve according to claim 1, wherein the first through hole (131) has a hole diameter of 1-5 mm.

9. A control method of a solenoid valve applied to the solenoid valve according to any one of claims 1 to 8, characterized by comprising the steps of:

the starting method comprises the following steps: opening the first valve body (2), and enabling the fluid to flow in from the water inlet (11) and flow into the second water passing area (5) from the first through hole (131) and the top end opening of the first pipe column (13) respectively; opening the second valve body (3), and enabling the fluid to flow into the second communication hole (141) from the top end opening of the second pipe column (14) and flow into the water outlet (12) from the second communication hole (141);

the closing method comprises the following steps: closing the first valve body (2), and enabling the fluid to flow into the second water passing area (5) from the first through hole (131) and flow into a water outlet (12) from the top end opening of the second tubular column (14); the second valve body (3) is closed, the second diaphragm (31) is abutted to the top end opening of the second column (14), and the fluid cannot flow through the second diaphragm.