阅读说明：本技术 一种电磁阀及其降低水锤效应的方法 (Electromagnetic valve and method for reducing water hammer effect ) 是由 林孝发 林孝山 刘祖华 徐鹏 林山 于 2021-02-05 设计创作，主要内容包括：本发明公开了一种电磁阀及其降低水锤效应的方法,所述电磁阀包括电磁阀本体、膜片,电磁阀本体内部设置阀腔和磁芯,膜片设于阀腔；膜片上设有进液孔和出液孔,电磁阀本体设有介质入口和介质出口,进液孔连通介质入口,出液孔连通介质出口,且出液孔由磁芯的第一端面控制启闭,在出液孔开启时,膜片产生形变使介质入口与介质出口连通；所述阀腔内设有限制部,该限制部使膜片在出液孔开启时产生不均匀形变,以使出液孔在膜片恢复形变之前随着磁芯伸出,其过流断面渐小。本发明使得磁芯回弹时不会瞬间关闭膜片的出液孔,而是缓慢关闭出液孔,从而将水锤效应减小到最低,既保护了水路与工作部件的安全,同时也消除了水锤效应引起的噪声。(The invention discloses a solenoid valve and a method for reducing water hammer effect, wherein the solenoid valve comprises a solenoid valve body and a diaphragm, a valve cavity and a magnetic core are arranged in the solenoid valve body, and the diaphragm is arranged in the valve cavity; the diaphragm is provided with a liquid inlet hole and a liquid outlet hole, the electromagnetic valve body is provided with a medium inlet and a medium outlet, the liquid inlet hole is communicated with the medium inlet, the liquid outlet hole is communicated with the medium outlet, the opening and closing of the liquid outlet hole are controlled by the first end face of the magnetic core, and when the liquid outlet hole is opened, the diaphragm deforms to enable the medium inlet to be communicated with the medium outlet; the valve cavity is internally provided with a limiting part which enables the diaphragm to generate uneven deformation when the liquid outlet hole is opened, so that the liquid outlet hole stretches out along with the magnetic core before the diaphragm recovers deformation, and the overflowing section of the diaphragm is gradually reduced. The invention ensures that the liquid outlet hole of the diaphragm is not closed instantly but is closed slowly when the magnetic core rebounds, thereby reducing the water hammer effect to the minimum, protecting the safety of a water path and a working part, and eliminating the noise caused by the water hammer effect.)

1. A solenoid valve comprises a solenoid valve body and a diaphragm, wherein a valve cavity and a magnetic core are arranged in the solenoid valve body, and the diaphragm is arranged in the valve cavity; the electromagnetic valve body is provided with a medium inlet and a medium outlet, the liquid inlet is communicated with the medium inlet, the liquid outlet is communicated with the medium outlet, the liquid outlet is controlled to be opened and closed by the magnetic core, and when the liquid outlet is opened, the diaphragm deforms to enable the medium inlet to be communicated with the medium outlet; the method is characterized in that: the solenoid valve body is equipped with the restriction portion, and this restriction portion makes the diaphragm produce inhomogeneous deformation when going out the liquid hole and opening to make out the liquid hole stretch out along with the magnetic core before the diaphragm resumes deformation, it overflows the section and diminishes.

2. The solenoid valve according to claim 1, wherein: the limiting part is located in the valve cavity, the liquid outlet hole is located in the middle of the diaphragm, and the limiting part is matched with the eccentric position of the diaphragm.

3. The electromagnetic valve according to claim 1 or 2, characterized in that: the diaphragm divides the valve cavity into a main flow cavity and an auxiliary flow cavity, and the auxiliary flow cavity and the magnetic core are positioned on the same side of the diaphragm; the liquid inlet hole is communicated with the auxiliary flow cavity and the main flow cavity; and in the opening state of the liquid outlet hole, the medium inlet is communicated with the medium outlet through the main flow cavity.

4. The solenoid valve according to claim 3, wherein: the limiting part is positioned in the auxiliary flow cavity and props against the diaphragm, or a preset gap is formed between the limiting part and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm.

5. The solenoid valve according to claim 3, wherein: the restriction is located within the main flow lumen and pulls on the membrane sheet.

6. The solenoid valve according to claim 4, wherein: the limiting part is a column, and the free end of the limiting part is propped against the diaphragm.

7. The solenoid valve according to claim 1, wherein: the electromagnetic valve body comprises a valve shell and a valve cover which are hermetically connected and enclose a valve cavity; the magnetic core is arranged in the valve shell, and a return spring is matched between the magnetic core and the valve shell; the medium inlet and the medium outlet are provided on the valve cover.

8. The solenoid valve according to claim 1, wherein: the liquid outlet is controlled to be opened and closed by the first end face of the magnetic core, a convex column is arranged on the part where the liquid outlet is located facing one side of the magnetic core, the liquid outlet penetrates through the convex column, the end face of the free end of the convex column forms a second end face, and the second end face is not parallel to the first end face in the deformation state of the diaphragm.

9. A method for reducing water hammer effect of an electromagnetic valve comprises the steps that the electromagnetic valve comprises an electromagnetic valve body and a diaphragm, a valve cavity and a magnetic core are arranged in the electromagnetic valve body, and the diaphragm is arranged in the valve cavity; the diaphragm is provided with a liquid inlet hole and a liquid outlet hole, the electromagnetic valve body is provided with a medium inlet and a medium outlet, the liquid inlet hole is communicated with the medium inlet, the liquid outlet hole is communicated with the medium outlet, the liquid outlet hole is controlled to be opened and closed by the first end face of the magnetic core, and the diaphragm deforms to enable the medium inlet to be communicated with the medium outlet when the liquid outlet hole is opened; the method is characterized in that: the method for reducing the water hammer effect of the electromagnetic valve is characterized in that the diaphragm is controlled to generate uneven deformation when the liquid outlet hole is opened, so that the liquid outlet hole stretches out along with the magnetic core before the diaphragm recovers deformation, and the overflowing section of the liquid outlet hole is gradually reduced.

10. The method for reducing the water hammer effect of the electromagnetic valve according to claim 9, wherein: a limiting part is arranged in the valve cavity, and the limiting part enables the membrane to generate uneven deformation in the opening state of the liquid outlet hole.

11. The method for reducing the water hammer effect of the electromagnetic valve according to claim 9, wherein: the limiting part and the magnetic core are positioned on the same side of the diaphragm, and the limiting part is abutted against the diaphragm, or a preset gap is formed between the limiting part and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm; or the limiting part and the magnetic core are positioned on different sides of the diaphragm, and the limiting part holds the diaphragm.

Technical Field

The invention relates to an electromagnetic valve and a method for reducing water hammer effect.

Background

At present, diaphragm formula solenoid valve generally includes body, diaphragm, and inside valve pocket and the magnetic core of setting up of body, the diaphragm setting is equipped with feed liquor hole and play liquid hole on the diaphragm in the valve pocket, and the body is equipped with medium entry and medium export, feed liquor hole intercommunication medium entry, goes out liquid hole intercommunication medium export, and goes out the liquid hole and open and close by the magnetic core control, and at a liquid hole open mode, the diaphragm receives the pressure variation that both sides received to produce deformation and makes medium entry and medium export intercommunication. The liquid outlet holes on the diaphragm can be closed instantly when the magnetic core rebounds, so that a water hammer effect is generated, noise is caused, and the service life of a component is also influenced.

Disclosure of Invention

The invention provides an electromagnetic valve and a method for reducing water hammer effect thereof, aiming at the technical problems in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a solenoid valve comprises a solenoid valve body and a diaphragm, wherein a valve cavity and a magnetic core are arranged in the solenoid valve body, and the diaphragm is arranged in the valve cavity; the electromagnetic valve body is provided with a medium inlet and a medium outlet, the liquid inlet is communicated with the medium inlet, the liquid outlet is communicated with the medium outlet, the liquid outlet is controlled to be opened and closed by the magnetic core, and when the liquid outlet is opened, the diaphragm deforms to enable the medium inlet to be communicated with the medium outlet; the solenoid valve body is equipped with the restriction portion, and this restriction portion makes the diaphragm produce inhomogeneous deformation when going out the liquid hole and opening to make out the liquid hole stretch out along with the magnetic core before the diaphragm resumes deformation, it overflows the section and diminishes.

Furthermore, the limiting part is located in the valve cavity, the liquid outlet hole is located in the middle of the diaphragm, and the limiting part is matched with the eccentric position of the diaphragm.

Furthermore, the valve cavity is divided into a main flow cavity and an auxiliary flow cavity by the diaphragm, and the auxiliary flow cavity and the magnetic core are positioned on the same side of the diaphragm; the liquid inlet hole is communicated with the auxiliary flow cavity and the main flow cavity; and in the opening state of the liquid outlet hole, the medium inlet is communicated with the medium outlet through the main flow cavity.

Further, the limiting part is located in the auxiliary flow cavity and abuts against the diaphragm, or a preset gap is formed between the limiting part and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm.

Further, the restriction is located within the main flow lumen and pulls on the membrane sheet.

Further, the restricting portion is a post, and a free end thereof abuts against the diaphragm.

Furthermore, the electromagnetic valve body comprises a valve casing and a valve cover which are hermetically connected and enclose the valve cavity; the magnetic core is arranged in the valve shell, and a return spring is matched between the magnetic core and the valve shell; the medium inlet and the medium outlet are provided on the valve cover.

Furthermore, the liquid outlet is controlled by the first end face of the magnetic core to be opened and closed, a convex column is arranged on the part where the liquid outlet is located, facing one side of the magnetic core, the liquid outlet penetrates through the convex column, the end face of the free end of the convex column forms a second end face, and the second end face is not parallel to the first end face in the deformation state of the diaphragm.

The invention also provides a method for reducing the water hammer effect of the electromagnetic valve, wherein the electromagnetic valve comprises an electromagnetic valve body and a diaphragm, a valve cavity and a magnetic core are arranged in the electromagnetic valve body, and the diaphragm is arranged in the valve cavity; the diaphragm is provided with a liquid inlet hole and a liquid outlet hole, the electromagnetic valve body is provided with a medium inlet and a medium outlet, the liquid inlet hole is communicated with the medium inlet, the liquid outlet hole is communicated with the medium outlet, the liquid outlet hole is controlled to be opened and closed by the first end face of the magnetic core, and the diaphragm deforms to enable the medium inlet to be communicated with the medium outlet when the liquid outlet hole is opened; the method for reducing the water hammer effect of the electromagnetic valve is characterized in that the diaphragm is controlled to generate uneven deformation when the liquid outlet hole is opened, so that the liquid outlet hole stretches out along with the magnetic core before the diaphragm recovers deformation, and the overflowing section of the liquid outlet hole is gradually reduced.

Furthermore, a limiting part is arranged in the valve cavity, and the limiting part enables the membrane to generate uneven deformation in the opening state of the liquid outlet hole.

Further, the limiting position and the magnetic core are located on the same side of the diaphragm, and the limiting portion abuts against the diaphragm, or a preset gap is formed between the limiting portion and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm; or the limiting part and the magnetic core are positioned on different sides of the diaphragm, and the limiting part holds the diaphragm.

Compared with the prior art, the invention has the following beneficial effects:

1. the diaphragm of the invention generates uneven deformation when the liquid outlet hole is opened, so that the liquid outlet hole extends out along with the magnetic core before the diaphragm recovers deformation, the overflowing section of the diaphragm is gradually reduced, the liquid outlet hole of the diaphragm can not be closed instantly when the magnetic core rebounds, but the liquid outlet hole is closed slowly, thereby reducing the water hammer effect to the minimum, protecting the safety of a water path and a working part, and eliminating the noise caused by the water hammer effect.

2. The limiting part is arranged in the valve cavity, so that the membrane can be unevenly deformed when the liquid outlet hole is opened by the limiting part, and the valve cavity is simple in structure and convenient to arrange.

3. The restriction part can be arranged in the auxiliary flow cavity and also can be arranged in the main flow cavity, and the arrangement is convenient and fast. The limiting part is preferably a stand column and is simple and convenient to set.

The invention is further explained in detail with the accompanying drawings and the embodiments; however, the solenoid valve and the method of reducing the water hammer effect according to the present invention are not limited to the embodiments.

Drawings

FIG. 1 is an exploded schematic view of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a cross-sectional view of the present invention in the closed position;

FIG. 4 is a cross-sectional view of the present invention in an open state;

FIG. 5 is a cross-sectional view of the present invention with the first end face in initial contact with the second end face;

fig. 6 is a cross-sectional view of the present invention returning to the closed state.

Detailed Description

In an embodiment, please refer to fig. 1 to 6, the solenoid valve of the present invention includes a solenoid valve body, a diaphragm 2, a valve cavity and a magnetic core 3 are disposed in the solenoid valve body, and the diaphragm 2 is disposed in the valve cavity; the diaphragm 2 is provided with a liquid inlet hole 21 and a liquid outlet hole 22, the electromagnetic valve body is provided with a medium inlet 11 and a medium outlet 12, the liquid inlet hole 21 is communicated with the medium inlet 11, the liquid outlet hole 22 is communicated with the medium outlet 12, the liquid outlet hole 22 is controlled to be opened and closed by the magnetic core 3, and when the liquid outlet hole 22 is opened, the diaphragm 2 deforms to enable the medium inlet 11 to be communicated with the medium outlet 12; the electromagnetism body is equipped with the restriction portion, and this restriction portion impels diaphragm 2 to produce inhomogeneous deformation when going out liquid hole 22 and opens, makes out liquid hole 22 and keeps the open mode before diaphragm 2 resumes deformation, and along with magnetic core 3 stretches out (magnetic core 3 moves towards the direction of closing out liquid hole 22 promptly), goes out the section of overflowing of liquid hole 22 and diminishes (reducing gradually promptly). The diaphragm 2 specifically divides the valve cavity into a main flow cavity 13 and an auxiliary flow cavity 41, and the auxiliary flow cavity 41 and the magnetic core 3 are positioned on the same side of the diaphragm 2; the liquid inlet hole 21 is communicated with the auxiliary flow cavity 41 and the main flow cavity 13; in the open state of the outlet opening 22, the medium inlet 11 is connected to the medium outlet 12 via the main flow chamber 13.

In this embodiment, the limiting portion is located in the valve cavity, the liquid outlet 22 is located in the middle of the diaphragm 2, and the limiting portion is fitted in an eccentric position of the diaphragm 2. Said restriction is in particular located in the auxiliary flow chamber 41 and abuts against said membrane 2. In other embodiments, the restriction portion is located in the auxiliary flow chamber, and a predetermined gap is formed between the restriction portion and the diaphragm, and the predetermined gap is smaller than the deformation stroke of the diaphragm, so that when the portion of the diaphragm corresponding to the restriction portion is deformed to be in contact with the restriction portion, the diaphragm will not be further deformed. In other embodiments, the restriction is located within the main flow lumen and pulls on the membrane sheet.

In the present embodiment, the restricting portion is specifically the pillar 42, but is not limited thereto. The free end of the post 42 bears against the diaphragm 2.

In this embodiment, the solenoid valve body includes a valve housing 4 and a valve cover 1, which are hermetically connected and enclose the valve cavity, and the peripheral edge of the diaphragm 2 is fixed between the valve housing 4 and the valve cover 1; the magnetic core 3 is arranged in the valve shell 4, and a return spring 5 is matched between the magnetic core and the valve shell 4; the medium inlet 11 and the medium outlet 12 are provided on the valve cover 1. The post 42 is formed integrally with the valve housing 4, but is not limited thereto.

In this embodiment, the liquid outlet 22 is controlled to open and close by the first end surface 31 of the magnetic core 3, a protruding pillar 23 is disposed on a side of the liquid outlet 22 facing the magnetic core 3, the liquid outlet 22 penetrates through the protruding pillar 23, an end surface of a free end of the protruding pillar 23 forms a second end surface 231, and in the deformation state of the diaphragm 2, the second end surface 231 is not parallel to the first end surface 31.

Fig. 3 shows an initial state of the electromagnetic valve of the present invention, at this time, the electromagnetic valve is in a closed state (i.e., the medium inlet 11 is not communicated with the medium outlet 12), the diaphragm 2 is in a recovery state, the first end surface 31 of the magnetic core 3 is attached to the second end surface 231 of the convex pillar 23, and the liquid outlet 22 in the middle of the diaphragm 2 is closed. When the electromagnetic valve is powered on to enable the magnetic core 3 to be sucked into the cavity of the valve housing 4, the liquid outlet hole 22 is opened, at the moment, the auxiliary flow cavity 41 and the main flow cavity 13 form a dynamic balance state, and under the action of water pressure, the diaphragm 2 deforms towards the auxiliary flow cavity 41, so that the medium inlet 11 is communicated with the medium outlet 12 through the main flow cavity 13, namely, the electromagnetic valve is in an open state. Due to the existence of the upright post 42 in the auxiliary flow cavity 41, the diaphragm 2 is not uniformly deformed, but is deformed in a single side, as shown in fig. 4, at this time, the first end surface 31 of the magnetic core 3 is not parallel to the second end surface 231 of the convex post 23.

When the electromagnetic valve is powered off and the magnetic force restraining the magnetic core 3 disappears, the magnetic core 3 gradually extends out under the action of the return spring 5 (i.e. the magnetic core moves towards the direction closing the liquid outlet hole 22), and because the first end surface 31 of the magnetic core 3 is not parallel to the second end surface 231 of the convex column 23, when the first end surface 31 of the magnetic core 3 contacts with the second end surface 231 of the convex column 23, the first end surface 31 and the second end surface 231 are not completely attached but have an included angle therebetween, as shown in fig. 5, the overflow section of the liquid outlet hole 22 is reduced, and the overflow section of the liquid inlet hole 21 is unchanged, at this time, the amount of water entering the auxiliary flow cavity 41 is greater than the amount of water flowing out of the auxiliary flow cavity 41, so that the diaphragm 2 gradually recovers deformation, and in this process, the magnetic core 3 can also provide a force for recovering deformation to the diaphragm 2. Therefore, the outlet hole 22 remains open until the diaphragm 2 is deformed, and is not instantaneously closed by the magnetic core 3. When the diaphragm 2 is deformed again, the second end 231 thereof is restored to a state of being parallel to and attached to the first end 31 of the magnetic core 3 as shown in fig. 6, thereby closing the liquid outlet hole 22, and at the same time, disconnecting the medium inlet 11 from the medium outlet 12, and restoring the solenoid valve to a closed state.

According to the electromagnetic valve, the limiting part enables the membrane 2 to generate uneven deformation when the liquid outlet hole is opened, so that unilateral deformation is large, the liquid outlet hole 22 of the membrane 2 cannot be closed instantly when the magnetic core 3 rebounds, but the liquid outlet hole 22 is closed slowly, so that the water hammer effect is reduced to the minimum, the safety of a water path and a working part is protected, and noise caused by the water hammer effect is eliminated. In addition, the invention does not influence the opening time of the electromagnetic valve.

According to the method for reducing the water hammer effect of the electromagnetic valve, as shown in fig. 1-6, the electromagnetic valve comprises an electromagnetic valve body and a diaphragm 2, a valve cavity and a magnetic core 3 are arranged in the electromagnetic valve body, and the diaphragm 2 is arranged in the valve cavity; be equipped with feed liquor hole 21 and play liquid hole 22 on diaphragm 2, the solenoid valve body is equipped with medium entry 11 and medium export 12, and feed liquor hole 21 communicates medium entry 11, goes out liquid hole 22 and communicates medium export 12, and goes out liquid hole 22 and open and close by the control of magnetic core 3, and when going out liquid hole 22 and opening, diaphragm 2 produces deformation and makes medium entry 11 and medium export 12 communicate. The method for reducing the water hammer effect of the electromagnetic valve is to control the membrane 2 to generate uneven deformation when the liquid outlet hole 22 is opened, so that the liquid outlet hole 22 is kept in an opening state before the membrane 2 recovers deformation, and the overflowing section of the liquid outlet hole 22 is gradually reduced along with the extension of the magnetic core 3.

In this embodiment, the diaphragm 2 specifically divides the valve cavity into a main flow cavity 13 and an auxiliary flow cavity 41, and the auxiliary flow cavity 41 and the magnetic core 3 are located on the same side of the diaphragm 2; the liquid inlet hole 21 is communicated with the auxiliary flow cavity 41 and the main flow cavity 13; in the open state of the outlet opening 22, the medium inlet 11 is connected to the medium outlet 12 via the main flow chamber 13.

In this embodiment, a limiting portion may be disposed in the valve cavity, and the limiting portion may cause the membrane to deform unevenly when the liquid outlet hole is opened. Specifically, the limiting portion and the magnetic core 3 may be located on the same side of the diaphragm 2, and the limiting portion abuts against the diaphragm 2 and is located at an eccentric position of the diaphragm 2. The stopper may be a pillar 41 or the like. In other embodiments, the restriction portion is located in the auxiliary flow chamber, and a predetermined gap is formed between the restriction portion and the diaphragm, and the predetermined gap is smaller than the deformation stroke of the diaphragm, so that when the portion of the diaphragm corresponding to the restriction portion is deformed to be in contact with the restriction portion, the diaphragm will not be further deformed. In other embodiments, the restriction is located within the main flow lumen and pulls on the membrane sheet.

In this embodiment, the solenoid valve body includes a valve housing 4 and a valve cover 1, which are hermetically connected and enclose the valve cavity, and the peripheral edge of the diaphragm 2 is fixed between the valve housing 4 and the valve cover 1; the magnetic core 3 is arranged in the valve shell 4, and a return spring is matched between the magnetic core and the valve shell 4; the medium inlet 11 and the medium outlet 12 are provided on the valve cover 1. The post 42 is formed integrally with the valve housing 4, but is not limited thereto.

In this embodiment, the liquid outlet 22 is controlled to open and close by the first end surface 31 of the magnetic core 3, a protruding pillar 23 is disposed on a side of the liquid outlet 22 facing the magnetic core 3, the liquid outlet 22 penetrates through the protruding pillar 23, an end surface of a free end of the protruding pillar 23 forms a second end surface 231, and in the deformation state of the diaphragm 2, the second end surface 231 is not parallel to the first end surface 31.

According to the method for reducing the water hammer effect of the electromagnetic valve, in an initial state, the diaphragm 2 is in a recovery state, the first end face 31 of the magnetic core is attached to the second end face 231 of the convex column, and the liquid outlet hole 22 in the middle of the diaphragm is closed. When the electromagnetic valve is powered on to enable the magnetic core 3 to be sucked into the cavity of the valve housing 4, the liquid outlet hole 22 is opened, at the moment, the auxiliary flow cavity 41 and the main flow cavity 13 form a dynamic balance state, and under the action of water pressure, the diaphragm 2 deforms towards the auxiliary flow cavity 41, so that the medium inlet 11 is communicated with the medium outlet 12 through the main flow cavity 13, namely, the electromagnetic valve is in an open state. Due to the existence of the upright post 42 in the auxiliary flow cavity 41, the diaphragm 2 is not uniformly deformed, but is deformed in a single side, as shown in fig. 4, at this time, the first end surface 31 of the magnetic core 3 is not parallel to the second end surface 231 of the convex post 23.

When the electromagnetic valve is powered off and the magnetic force for restraining the magnetic core 3 disappears, the magnetic core 3 moves towards the direction close to the diaphragm 2 under the action of the reset spring, when the first end face 31 of the magnetic core 3 contacts with the second end face 231 of the convex column 23, an included angle is formed between the first end face 31 and the second end face 231, as shown in fig. 5, the overflowing section of the liquid outlet hole 22 is reduced, the overflowing section of the liquid inlet hole 21 is unchanged, at the moment, the water amount entering the auxiliary flow cavity 41 is larger than the water amount flowing out of the auxiliary flow cavity 41, so that the diaphragm 2 gradually recovers deformation, and in the process, the magnetic core 3 can also provide the diaphragm 2 with a force for recovering deformation under the action of the reset spring. Therefore, the outlet hole 22 remains open until the diaphragm 2 is deformed, and is not instantaneously closed by the magnetic core 3. When the diaphragm 2 is deformed again, the second end 231 thereof is restored to a state of being parallel to and attached to the first end 31 of the magnetic core 3 as shown in fig. 6, thereby closing the liquid outlet hole 22, and at the same time, disconnecting the medium inlet 11 from the medium outlet 12, and restoring the solenoid valve to a closed state.

According to the method for reducing the water hammer effect of the electromagnetic valve, when the liquid outlet hole 22 is opened, the single-side deformation of the diaphragm 2 is large, so that the liquid outlet hole 22 of the diaphragm 2 is not closed instantly when the magnetic core 3 rebounds, but the liquid outlet hole 22 is closed slowly, the water hammer effect is reduced to the minimum, the safety of a water path and a working part is protected, and meanwhile, noise caused by the water hammer effect is eliminated. In addition, the invention does not influence the opening time of the electromagnetic valve.

The above embodiments are only used to further illustrate the solenoid valve and the method for reducing the water hammer effect of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the protection scope of the technical solution of the present invention.