CN113623456B

CN113623456B - Electromagnetic valve and control method thereof

Info

Publication number: CN113623456B
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: 2023-07-21
Anticipated expiration: 2041-07-29
Also published as: CN113623456A

Abstract

The invention provides a solenoid valve and a control method thereof, wherein the solenoid valve comprises the following components: a valve seat, a first valve body, and a second valve body; the first valve body and the second valve body are connected with 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 top openings are respectively arranged in the valve seat; the periphery of the first tubular column and the periphery of the second tubular column respectively form a first water passing area and a second water passing area with the inner wall of the valve seat; the water inlet, the first water passing area, the first pipe column top opening, the second water passing area, the second pipe column top opening and the water outlet are sequentially communicated; the side wall of the first tubular column is provided with a first through hole; when the first valve body is closed and the second valve body is opened, the water inlet, the first water through area, the first through hole, the second water through area, the top end opening of the second pipe column and the water outlet are sequentially communicated.

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 electromagnetic valve is a valve control device controlled by electromagnetic force. Solenoid valves are often used to control parameters such as the flow direction, flow rate, etc. of fluids such as water, gas, hydraulic oil, etc., and are automation components for controlling fluids. Solenoid valves are of a wide variety and different types of solenoid valves tend to have different functions. Common solenoid valves include water solenoid valves, gas solenoid valves, hydraulic solenoid valves, pulse solenoid valves, direct current solenoid valves, and the like.

When the valve switch closes the waterway, the phenomenon of water hammer effect exists, and the water hammer effect easily damages the waterway pipeline and the valve switch, so that the service life of the valve switch is reduced. The conventional electromagnetic valve can reduce adverse effects caused by water hammer effect by delaying the water closing time. When the water is turned off, the water pressure in the valve body can be gradually reduced, so that the water hammer effect is eliminated. While the delayed water closing can eliminate the water hammer effect, the water resource waste is definitely 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 shortens the delayed valve closing time.

Disclosure of Invention

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

The invention is realized in the following way: a solenoid valve, comprising: a valve seat, a first valve body, and a second valve body; wherein the first valve body and the second valve body are connected with 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 top openings are respectively arranged in the valve seat; the periphery of the first tubular column and the second tubular column and the inner wall of the valve seat form a first water-through area and a second water-through area respectively; the water inlet, the first water passing area, the first pipe column top opening, the second water passing area, the second pipe column top opening and the water outlet are sequentially communicated; wherein, the liquid crystal display device comprises a liquid crystal display device,

the side wall of the first tubular column is provided with a first through hole; when the first valve body is closed and the second valve body is opened, the water inlet, the first water through area, the first through hole, the second water through area, the top end opening of the second pipe column and the water outlet are sequentially communicated.

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

As a further improvement, a second communication hole is formed in the inner wall of the second tubular column, and the second communication hole is 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 top end opening of the first tubular 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 formed in the first diaphragm, and the first balance hole is communicated with the first hole column and the first water passage 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 tubular 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 is 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 invention also provides a control method of the electromagnetic valve, which is applied to the electromagnetic valve, and comprises the following steps:

the opening method comprises the following steps: opening a first valve body, and enabling fluid to flow in from a water inlet and flow into a second water-passing area from the first through hole and the top end opening of the first tubular column respectively; opening a second valve body, and enabling fluid to flow into a second communication hole from an opening at the top end of the second tubular column and flow into a water outlet from the second communication hole;

the closing method comprises the following steps: closing the first valve body, and allowing the fluid to flow into the second water passing area from the first through hole and flow into the water outlet from the top end opening of the second pipe column; and closing the second valve body, wherein the second diaphragm is abutted to the top end opening of the second pipe column, and fluid cannot circulate.

The beneficial effects of the invention are as follows:

the method comprises the following steps: 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 plugged or opened at the top end openings of the pipe columns. Wherein, be equipped with first through-hole on first tubular column. The invention can realize normal water supply after the first valve body and the second valve body are opened; when the valve body is closed, the first valve body is closed first, 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 in the first pipe column. At this time, the large water flow is changed into the small water flow, and the water pressure is reduced; and then the second valve body is closed, and the diaphragm in the second valve body is abutted against the top end opening of the second tubular column, so that the electromagnetic valve is closed. Through set up first through-hole on first tubular column, can realize that the big rivers when closing the valve become little rivers, effectively eliminate the water hammer effect to reduce the duration of closing the valve, thereby avoid wasting water resource. The valve seat is simple in structure, the first through hole is ingenious in design, water hammer is effectively eliminated, valve closing time is shortened, and water is saved.

And two,: the two valve bodies arranged on the valve seat in the invention can be connected in series, such as a first valve body and a second valve body; and 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 needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a solenoid valve according to embodiment 1 of the present invention.

Figure 2 is a schematic view in section A-A according to figure 1.

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

Fig. 4 is a schematic view taken along line B-B of fig. 3.

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

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

Fig. 7 is a schematic view in section C-C according to fig. 6.

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

Fig. 9 is a schematic view taken along line D-D of fig. 8.

The drawings 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 string;

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

2. a first valve body;

21. a first membrane; 211. a first balance hole; 22. a first hole column; 23. a first iron core;

3. a second valve body;

31. a second membrane; 311. a second balance hole; 32. a second hole column; 33. a second iron core;

4. a first water passage area;

5. a second water-passing area;

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

7. and a third water-passing area.

Detailed Description

For the purpose of making 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 clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as 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," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The electromagnetic valve has wide application fields, such as household bathroom and other fields, such as induction water taps, toilets and the like in families. The prior electromagnetic valve often eliminates the influence of the water hammer effect by delaying the valve closing time, but the delayed valve closing necessarily causes waste of water resources. The electromagnetic valve is used for a long time and a month, which can certainly 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, the large water flow in the electromagnetic valve is changed into the small water flow, and then the second valve body is closed, so that the electromagnetic valve is closed. Not only eliminating the influence of water hammer, but also shortening the valve closing time and saving 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 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 body 2 and the second valve body 3 may be connected to the valve seat 1 by any one of a fixed connection, a hinge connection, a pin connection, an abutment connection, a screw connection, and the like, and is not limited herein. The first valve body 2 and the second valve body 3 in the present embodiment may be provided on the same side surface of the valve seat 1, or may be provided 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 in this embodiment has a water inlet 11 at one end and a water outlet 12 at the other end. Meanwhile, a first column 13 and a second column 14 having an open top end are respectively provided in the valve seat 1. The first column 13 and the second column 14 are designed with open top ends and closed bottom ends. When the first valve body 2 and the second valve body 3 are installed on the valve seat 1, the bottom end of the first valve body 2 is plugged or the top end opening of the first tubular column 13 is opened; 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 side wall of the first tubular column 13 in the present embodiment is provided with a first through hole 131; the number of the through holes 131 may be one or a plurality. The first through hole 131 may be provided on a side wall of the first string 13 or may be provided at the top end of the first string 13. I.e., a notch is formed in the top end of the first tubular string 13 as shown in fig. 5. The aperture of the first through hole 131 in this embodiment is 1 to 5mm. Preferably, one first through hole 131 is provided in this embodiment, and the aperture of the first through hole 131 is preferably 3mm. When the aperture of the first through hole 131 is less than 1mm, the water passing amount of the first through hole 131 may be very small. At this time, if the first through hole 131 having too small a water passing aperture easily generates a water hammer effect in the solenoid valve when the first valve body 2 is closed, the effect of eliminating the water hammer effect using the solenoid valve in the present embodiment cannot be achieved. When the aperture 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 large aperture after the first valve body 2 is closed. At this time, a certain water hammer effect is generated when the second valve body 3 is closed, and the solenoid valve in this embodiment cannot be used optimally. Therefore, the present embodiment defines the aperture of the first through hole 131 so that the use effect of the solenoid valve in the present embodiment can be optimally exerted.

Further, it should be specifically noted that, in this embodiment, the outer periphery of the first pipe column 13 and the inner wall of the valve seat 1 form a first water passing area 4, as shown in fig. 3. The first water-passing area 4 is communicated with the water inlet 11 and the top 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 passing area 5. The side wall of the first pipe string 13 is also provided with a first communication hole 132. The second water passing area 5 in this embodiment is connected to the top opening of the second pipe string 14 and the first communication hole 132. The inner wall of the second pipe 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 the bottom end of the first valve body 2 in this embodiment, and the first diaphragm 21 is used for plugging or opening the top end opening 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 hole 211 is connected to the first hole column 22 and the first water passing area 4. Specifically, a perforation is provided 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 perforation 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 holes. By controlling the energizing state of the first valve body 2, 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, thereby adjusting the water-passing state of the first hole column 22.

Further, the bottom end of the second valve body 3 in this embodiment is provided with a second diaphragm 31, and the second diaphragm 31 is used for plugging 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 hole 311 is connected to the second hole pillar 32 and the second water passing area 5. As with the first valve body 2, the second valve body 3 is also provided with a second iron core 33. 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 interior of the valve body. By controlling the energized state of the second valve body 3, the end of the second iron core 33 can be adjusted to block or open the water inlet at the top end of the second hole column 32, thereby adjusting the water passing state of the second hole column 32.

It should be further noted that, in the implementation of the solenoid valve in this embodiment, water flows from the water inlet 11 into the first water passage 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 flow flows from the first through hole 131 into the first string 13; a part of the water flows from the first balance hole 211 into the upper portion of the first diaphragm 21 and flows from the holes in the periphery of the first hole column 22 into the water inlet above the first hole column 22, and flows from the first hole column 22 into the first pipe column 13. At this time, the water pressure in the first water passing area 4 is greater than the water pressure in the first diaphragm 21. Under the action of the pressure difference, the first diaphragm 21 moves upwards and elastically away from the top end opening of the first pipe column 13, so that the top end opening of the first pipe column 13 is opened, and water flows in from the top end opening of the first pipe column 13 with a larger aperture and then flows into the second water passing area 5. The second valve body 3 is opened, and the second iron core 33 is far away from the water inlet at the top end of the second hole column 32. Similarly, the second diaphragm 31 is separated from the top opening of the second pipe string 14 by the pressure difference, the top opening of the second pipe string 14 is opened, and the water flows from the top of the second pipe string 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 at the same time. 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 hole 311 is designed identically to the first balance hole 211. The first balance hole 211 is located at the outer periphery of the first string 13, and the second balance hole 311 is located at the outer periphery of the second string 14.

When the electromagnetic valve in the embodiment needs to be closed, the first valve body 2 is closed first, so that the first iron core 23 blocks the water inlet arranged at the top end of the first hole column 22. At this time, the top end of the first hole column 22 is opened to prevent water from flowing therethrough, and the water pressure in the first membrane 21 is greater than the water pressure in the first water flowing area 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 pipe column 13, so as to block the opening at the top end of the first pipe column 13. At this time, the water flow can only flow into the first string 13 from the first through hole 131 of the smaller bore. The first through hole 131 has a small aperture and a small water flow rate, so that the water flow rate flowing out of the water outlet 12 becomes small. When the first valve body 2 is closed firstly, the effect of reducing the large water flow into the small water flow is achieved, so that the impact force of the water flow is reduced. Further, at this time, the second valve body 3 is then closed, and the distal end of the second core 33 is brought into contact with the water inlet on the second hole stem 32. Likewise, the second diaphragm 31 abuts against the opening in the second pipe string 14 under the pressure difference to block the second pipe string 14. At this time, the solenoid valve in this embodiment is completely closed, and the water outlet 12 is no longer circulated.

The embodiment also provides a control method of the electromagnetic valve, which is applied to the electromagnetic valve, and the control method comprises the following steps:

the opening method comprises the following steps: opening the first valve body 2, and allowing 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 opening of the first pipe column 13, respectively; the second valve body 3 is opened, and the fluid flows into the second communication hole 141 from the top end opening of the second pipe string 14, and flows into the water outlet 12 from the second communication hole 141. In the present embodiment, there is no priority to open the first valve body 2 and open the second valve body 3, and only the first valve body 2 and the second valve body 3 are opened to allow water.

The closing method comprises the following steps: closing the first valve body 2, and allowing the fluid to flow into the second water passing area 5 from the first through hole 131 and flow into the water outlet 12 from the top end opening of the second pipe column 14; the second valve body 3 is closed, the second diaphragm 31 is abutted against the top end opening of the second pipe column 14, and fluid cannot circulate. In closing the solenoid valve in this embodiment, 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 small water flow.

By the electromagnetic valve and the control method of the electromagnetic valve, the water hammer effect can be effectively reduced, water is saved, and the valve closing time is shortened. The average valve closing time of the solenoid valve in this embodiment can be controlled within 0.7s without delay in valve closing.

Example 2

As shown in fig. 6 and 7, the electromagnetic valve provided in this embodiment includes a valve seat 1, a first valve body 2, and a third valve body 6. Specifically, the first valve body 2 in the present 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-operated solenoid valve, and the third valve body 6 is a straight-through solenoid valve. In the valve seat 1 of the present embodiment, only one third column 15 is provided.

Further, as shown in fig. 8 and 9, in this embodiment, the top end of the third pipe column 15 is provided with an opening, a plurality of second through holes 151 are provided at the junction between 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 pipe column 15. Specifically, the periphery of the third pipe column 15 and the inner wall of the valve seat 1 form a third water-through area 7. The third pipe string 15 is provided with a third communication hole 153 in its side wall. The water inlet 11, the third water passing area 7, the second through hole 151, the third through hole 152, the third communication hole 153, and the water outlet 12 are sequentially communicated. And, the water inlet 11, the third water passing area 7, the top end opening of the third pipe string 15, the third communication hole 153, and the water outlet 12 are sequentially communicated.

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 far away from the opening at the top end of the third pipe column 15, and the water flows in from the opening at the top end of the third pipe column 15, and the water circulation process in this part is the same as that in embodiment 1. The third valve body 6 is opened again, the third iron core 61 in the third valve body 6 is far away from the third through hole 152, and water flows into the third through hole 152 from the second through hole 151, then enters the third communication hole 153, and then flows out from the water outlet 12. Further, 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 column 15. The water flow can only flow from the second through hole 151 having a small aperture, and from the third through hole 152 into the third communication hole 153, 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 water flow to a small water flow. Then, the third valve body 6 is closed, the third iron core 61 is abutted against the third through hole 152, and the third through hole 152 is blocked. At this point, the outlet 12 of the solenoid valve is no longer in flow communication.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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:

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 with the valve seat (1) in parallel;

one end of the valve seat (1) is provided with a water inlet (11), the other end of the valve seat is provided with a water outlet (12), and a first tubular column (13) and a second tubular column (14) with open 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-through area (4) and a second water-through 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 sequentially communicated; wherein, the liquid crystal display device comprises a liquid crystal display device,

a first through hole (131) is formed in the side wall of the first tubular 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 sequentially communicated;

wherein the aperture of the first through hole (131) is 1-5 mm.

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

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

4. The electromagnetic valve according to claim 1, characterized in that a first membrane (21) is arranged at the bottom end of the first valve body (2), and the first membrane (21) blocks or opens the top end opening of the first tubular 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 formed in 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 electromagnetic valve according to claim 1, characterized in that a second membrane (31) is arranged at the bottom end of the second valve body (3), and the second membrane (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. A control method of an electromagnetic valve applied to the electromagnetic valve according to any one of claims 1 to 7, characterized by comprising the following method:

the opening method comprises the following steps: opening the first valve body (2), and allowing 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 a second valve body (3), and enabling fluid to flow into a second communication hole (141) from the top end opening of a second tubular column (14) and flow into a water outlet (12) from the second communication hole (141);

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