A solenoid valve and a method for reducing water hammer effect thereof

Abstract

The present invention discloses a solenoid valve and a method for reducing water hammer effect. The solenoid valve includes a solenoid valve body and a diaphragm. The solenoid valve body is provided with a valve cavity and a magnetic core. The diaphragm is provided in the valve cavity. The diaphragm is provided with a liquid inlet and a liquid outlet. The solenoid valve body is provided with a medium inlet and a medium outlet. The liquid inlet is connected to the medium inlet, and the liquid outlet is connected to the medium outlet. The liquid outlet is controlled to open and close by the first end face of the magnetic core. When the liquid outlet is opened, the diaphragm deforms to connect the medium inlet with the medium outlet. A restricting portion is provided in the valve cavity. The restricting portion causes the diaphragm to deform unevenly when the liquid outlet is opened, so that the liquid outlet extends as the magnetic core before the diaphragm recovers its deformation, and its flow cross-section gradually decreases. The present invention ensures that when the magnetic core rebounds, the liquid outlet of the diaphragm does not instantly close, but slowly closes the liquid outlet, thereby minimizing the water hammer effect. This not only protects the safety of the waterway and working components, but also eliminates the noise caused by the water hammer effect.

Description

Technical Field

[0001] The invention relates to a solenoid valve and a method for reducing water hammer effect thereof. Background Art

[0002] Currently, diaphragm solenoid valves generally consist of a body and a diaphragm. The body houses a valve cavity and a magnetic core, with the diaphragm positioned within the cavity. The diaphragm is provided with a liquid inlet and a liquid outlet. The body also features a medium inlet and a medium outlet. The inlet connects to the medium inlet, while the outlet connects to the medium outlet. The outlet is controlled by the magnetic core. When the outlet is open, the diaphragm deforms due to pressure changes on both sides, connecting the medium inlet and outlet. The magnetic core rebounds, instantly closing the outlet on the diaphragm, causing a water hammer effect. This not only causes noise but also shortens the component's service life. Summary of the Invention

[0003] The present invention aims at solving the technical problems in the prior art and provides a solenoid valve and a method for reducing water hammer effect thereof.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a solenoid valve, including a solenoid valve body and a diaphragm, a valve cavity and a magnetic core are arranged inside the solenoid valve body, and the diaphragm is arranged in the valve cavity; a liquid inlet hole and a liquid outlet hole are provided on the diaphragm, and the solenoid valve body is provided with a medium inlet and a medium outlet, the liquid inlet hole is connected to the medium inlet, the liquid outlet hole is connected to the medium outlet, and the liquid outlet hole is controlled to be opened and closed by the magnetic core. When the liquid outlet hole is opened, the diaphragm is deformed to connect the medium inlet and the medium outlet; the solenoid valve body is provided with a limiting part, which causes the diaphragm to produce uneven deformation when the liquid outlet hole is opened, so that the liquid outlet hole extends as the magnetic core before the diaphragm recovers its deformation, and its flow cross-section gradually decreases.

[0005] Furthermore, the limiting portion is located in the valve cavity, the liquid outlet is located in the middle of the diaphragm, and the limiting portion is matched at an eccentric position of the diaphragm.

[0006] Furthermore, 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 located on the same side of the diaphragm; the liquid inlet hole connects the auxiliary flow cavity and the main flow cavity; when the liquid outlet hole is open, the medium inlet is connected to the medium outlet through the main flow cavity.

[0007] Furthermore, the limiting portion is located in the auxiliary flow cavity and abuts against the diaphragm, or a preset gap is provided between the limiting portion and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm.

[0008] Furthermore, the limiting portion is located in the main flow cavity and pulls the diaphragm.

[0009] Furthermore, the limiting portion is a column, the free end of which abuts against the diaphragm.

[0010] Furthermore, the solenoid valve body includes a valve housing and a valve cover, which are sealed and connected to form the valve cavity; the magnetic core is arranged in the valve housing, and a reset spring is cooperated between the magnetic core and the valve housing; the medium inlet and the medium outlet are arranged on the valve cover.

[0011] Furthermore, the liquid outlet is opened and closed by the first end face of the magnetic core. A convex column is provided on the side of the magnetic core where the liquid outlet is located. The liquid outlet passes through the convex column. The end face of the free end of the convex column constitutes a second end face. When the diaphragm is deformed, the second end face is not parallel to the first end face.

[0012] The present invention further provides a method for reducing water hammer effect by a solenoid valve. The solenoid valve includes a solenoid valve body and a diaphragm. A valve cavity and a magnetic core are arranged inside the solenoid valve body, and the diaphragm is arranged in the valve cavity. A liquid inlet hole and a liquid outlet hole are provided on the diaphragm. The solenoid valve body is provided with a medium inlet and a medium outlet. The liquid inlet hole is connected to the medium inlet, and the liquid outlet hole is connected to the medium outlet. The liquid outlet hole is controlled to open and close by the first end face of the magnetic core. When the liquid outlet hole is open, the diaphragm is deformed to connect the medium inlet with the medium outlet. The method for reducing water hammer effect by the solenoid valve is to control the diaphragm to produce uneven deformation when the liquid outlet hole is opened, so that the liquid outlet hole extends along with the magnetic core before the diaphragm recovers its deformation, and its flow cross-section gradually decreases.

[0013] Furthermore, a restriction portion is provided in the valve cavity, and the restriction portion causes the diaphragm to generate uneven deformation when the liquid outlet is in an open state.

[0014] Furthermore, the limiting portion and the magnetic core are located on the same side of the diaphragm, and the limiting portion presses against the diaphragm, or there is a preset gap between the limiting portion and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm; or the limiting portion and the magnetic core are located on different sides of the diaphragm, and the limiting portion pulls the diaphragm.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Since the diaphragm of the present invention produces uneven deformation when the liquid outlet is opened, the liquid outlet extends along with the magnetic core before the diaphragm recovers its deformation, and its flow cross-section gradually decreases. Therefore, when the magnetic core rebounds, the liquid outlet of the diaphragm will not be closed instantly, but will be closed slowly, thereby reducing the water hammer effect to a minimum, protecting the safety of the waterway and working parts, and eliminating the noise caused by the water hammer effect.

[0017] 2. The present invention sets a restriction portion in the valve cavity, and utilizes the restriction portion to cause the diaphragm to produce uneven deformation when the liquid outlet is opened. The structure is simple and the arrangement is convenient.

[0018] 3. The limiting part can be arranged in the auxiliary flow cavity or in the main flow cavity, which is convenient to arrange. The limiting part is preferably a column, which is easy to arrange.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the solenoid valve and the method for reducing water hammer effect thereof of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 3 is a cross-sectional view of the present invention in a closed state;

[0023] Figure 4 is a cross-sectional view of the present invention in an open state;

[0024] Figure 5 This is a cross-sectional view of the present invention when the first end face and the second end face are just in contact;

[0025] Figure 6 It is a cross-sectional view of the present invention restored to a closed state. DETAILED DESCRIPTION

[0026] For examples, see Figures 1-6 As shown, a solenoid valve of the present invention includes a solenoid valve body and a diaphragm 2. A valve cavity and a magnetic core 3 are provided inside the solenoid valve body, and the diaphragm 2 is provided in the valve cavity; a liquid inlet 21 and a liquid outlet 22 are provided on the diaphragm 2, and the solenoid valve body is provided with a medium inlet 11 and a medium outlet 12. The liquid inlet 21 is connected to the medium inlet 11, and the liquid outlet 22 is connected to the medium outlet 12. The opening and closing of the liquid outlet 22 is controlled by the magnetic core 3. When the liquid outlet 22 is opened, the diaphragm 2 is deformed to connect the medium inlet 11 with the medium outlet 12; the solenoid body is provided with a limiting portion, which causes the diaphragm 2 to produce uneven deformation when the liquid outlet 22 is opened, so that the liquid outlet 22 remains in an open state before the diaphragm 2 recovers its deformation, and as the magnetic core 3 extends (that is, the magnetic core 3 moves in the direction of closing the liquid outlet 22), the flow cross-section of the liquid outlet 22 gradually decreases (that is, gradually decreases). 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 21 connects the auxiliary flow cavity 41 and the main flow cavity 13; when the liquid outlet 22 is open, the medium inlet 11 is connected to the medium outlet 12 through the main flow cavity 13.

[0027] In this embodiment, the restricting portion is located within the valve cavity, the liquid outlet 22 is located in the middle of the diaphragm 2, and the restricting portion is fitted in an eccentric position on the diaphragm 2. The restricting portion is specifically located within the auxiliary flow cavity 41 and abuts against the diaphragm 2. In other embodiments, the restricting portion is located within the auxiliary flow cavity, and a preset gap is defined between the restricting portion and the diaphragm. This preset gap is smaller than the deformation range of the diaphragm. In this way, when the portion of the diaphragm corresponding to the restricting portion deforms to the point of contact with the restricting portion, it will no longer deform further. In other embodiments, the restricting portion is located within the main flow cavity and holds the diaphragm in place.

[0028] In this embodiment, the limiting portion is specifically a column 42 , but is not limited thereto. The free end of the column 42 abuts against the diaphragm 2 .

[0029] In this embodiment, the solenoid valve body includes a valve housing 4 and a valve cover 1, which are sealed and enclose the valve chamber. The edges of the diaphragm 2 are fixed between the valve housing 4 and the valve cover 1. The magnetic core 3 is disposed within the valve housing 4 and is engaged with a return spring 5 between the valve housing 4. The medium inlet 11 and the medium outlet 12 are disposed on the valve cover 1. The column 42 is integrally formed with the valve housing 4, but is not limited to this embodiment.

[0030] In this embodiment, the liquid outlet 22 is opened and closed by the first end face 31 of the magnetic core 3. A protrusion 23 is provided on the side of the liquid outlet 22 facing the magnetic core 3. The liquid outlet 22 passes through the protrusion 23. The end face of the free end of the protrusion 23 constitutes a second end face 231. When the diaphragm 2 is deformed, the second end face 231 is not parallel to the first end face 31.

[0031] The electromagnetic valve of the present invention has an initial state as follows Figure 3 As shown, at this time, the solenoid valve is in a closed state (i.e., the medium inlet 11 is not connected to the medium outlet 12), the diaphragm 2 is in a restored state, and the first end face 31 of the magnetic core 3 is in contact with the second end face 231 of the protruding column 23, closing the liquid outlet 22 in the middle of the diaphragm 2. When the solenoid valve is energized so that its magnetic core 3 is sucked into the hole of the valve housing 4, the liquid outlet 22 opens. At this time, the auxiliary flow cavity 41 and the main flow cavity 13 form a dynamic equilibrium state. Under the action of water pressure, the diaphragm 2 deforms toward the auxiliary flow cavity 41, thereby connecting the medium inlet 11 to the medium outlet 12 through the main flow cavity 13, that is, the solenoid valve is in an open state. Due to the presence of the column 42 in the auxiliary flow cavity 41, the diaphragm 2 does not deform evenly, but deforms unilaterally to a greater extent, as shown in FIG. Figure 4 As shown, at this time, the first end surface 31 of the magnetic core 3 is not parallel to the second end surface 231 of the protrusion 23 .

[0032] When the solenoid valve is powered off and the magnetic force binding the magnetic core 3 disappears, the magnetic core 3 gradually extends under the action of the reset spring 5 (that is, the magnetic core moves in the direction of closing the liquid outlet 22). Since the first end face 31 of the magnetic core 3 is not parallel to the second end face 231 of the protrusion 23, when the first end face 31 of the magnetic core 3 contacts the second end face 231 of the protrusion 23, the first end face 31 and the second end face 231 will not be completely in contact with each other, but there will be an angle between them, such as Figure 5 As shown, the flow cross-section of the liquid outlet 22 is reduced, while the flow cross-section of the liquid inlet 21 remains unchanged. At this time, the amount of water entering the auxiliary flow chamber 41 is greater than the amount of water flowing out of the auxiliary flow chamber 41, causing the diaphragm 2 to gradually recover its deformation. During this process, the magnetic core 3, under the action of the reset spring, also gives the diaphragm 2 a force to recover its deformation. Therefore, before the diaphragm 2 recovers its deformation, the liquid outlet 22 remains open and will not be closed instantly by the magnetic core 3. When the diaphragm 2 recovers its deformation, its second end face 231 returns to a state parallel to and in contact with the first end face 31 of the magnetic core 3, as shown in FIG. Figure 6 As shown, the liquid outlet 22 is closed, and at the same time, the medium inlet 11 is disconnected from the medium outlet 12, and the solenoid valve returns to the closed state.

[0033] The solenoid valve of the present invention uses a restricting portion to induce uneven deformation of the diaphragm 2 when the outlet port is opened, resulting in a larger unilateral deformation. This prevents the magnetic core 3 from instantly closing the outlet port 22 of the diaphragm 2 during rebound, but rather closes the outlet port 22 slowly. This minimizes the water hammer effect, protecting the waterway and working components while also eliminating noise caused by the water hammer effect. Furthermore, the present invention does not affect the opening time of the solenoid valve.

[0034] A method for reducing water hammer effect of a solenoid valve of the present invention is as follows: Figures 1-6 As shown, the solenoid valve includes a solenoid valve body and a diaphragm 2. The solenoid valve body is internally provided with a valve cavity and a magnetic core 3, with the diaphragm 2 disposed within the valve cavity. The diaphragm 2 is provided with a liquid inlet 21 and a liquid outlet 22. The solenoid valve body is provided with a medium inlet 11 and a medium outlet 12. The liquid inlet 21 communicates with the medium inlet 11, and the liquid outlet 22 communicates with the medium outlet 12. The opening and closing of the liquid outlet 22 is controlled by the magnetic core 3. When the liquid outlet 22 opens, the diaphragm 2 deforms, connecting the medium inlet 11 with the medium outlet 12. The solenoid valve reduces the water hammer effect by controlling the uneven deformation of the diaphragm 2 when the liquid outlet 22 opens, so that the liquid outlet 22 remains open until the diaphragm 2 recovers its deformation. Furthermore, as the magnetic core 3 extends, the flow cross-section of the liquid outlet 22 gradually decreases.

[0035] In this embodiment, the diaphragm 2 specifically divides the valve cavity into a main cavity 13 and an auxiliary cavity 41, and the auxiliary cavity 41 and the magnetic core 3 are located on the same side of the diaphragm 2; the liquid inlet 21 connects the auxiliary cavity 41 and the main cavity 13; when the liquid outlet 22 is open, the medium inlet 11 is connected to the medium outlet 12 through the main cavity 13.

[0036] In this embodiment, a restriction portion can be provided in the valve cavity, and the restriction portion can be used to cause the diaphragm to deform unevenly when the liquid outlet is open. Specifically, the restriction portion and the magnetic core 3 can be located on the same side of the diaphragm 2, and the restriction portion can be against the diaphragm 2 and located at an eccentric position of the diaphragm 2. The restriction portion can be a column 41 or the like. In other embodiments, the restriction portion is located in the auxiliary flow cavity, and there is a preset gap between the restriction portion and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm. In this way, when the portion of the diaphragm corresponding to the restriction portion is deformed to the point of contact with the restriction portion, it will no longer deform further. In other embodiments, the restriction portion is located in the main flow cavity and pulls the diaphragm.

[0037] 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 chamber. The edges of the diaphragm 2 are fixed between the valve housing 4 and the valve cover 1. The magnetic core 3 is disposed within the valve housing 4 and is engaged with a return spring. The medium inlet 11 and the medium outlet 12 are disposed on the valve cover 1. The column 42 is integrally formed with the valve housing 4, but is not limited to this embodiment.

[0038] In this embodiment, the liquid outlet 22 is opened and closed by the first end face 31 of the magnetic core 3. A protrusion 23 is provided on the side of the liquid outlet 22 facing the magnetic core 3. The liquid outlet 22 passes through the protrusion 23. The end face of the free end of the protrusion 23 constitutes a second end face 231. When the diaphragm 2 is deformed, the second end face 231 is not parallel to the first end face 31.

[0039] The present invention provides a method for reducing the water hammer effect of a solenoid valve. In the initial state, the diaphragm 2 is in a restored state, and the first end face 31 of the magnetic core fits with the second end face 231 of the convex column, closing the liquid outlet 22 in the middle of the diaphragm. When the solenoid valve is energized to suck its magnetic core 3 into the hole of the valve housing 4, the liquid outlet 22 opens. At this time, the auxiliary flow cavity 41 and the main flow cavity 13 form a dynamic equilibrium state. Under the action of water pressure, the diaphragm 2 deforms toward the auxiliary flow cavity 41, so that the medium inlet 11 is connected to the medium outlet 12 through the main flow cavity 13, that is, the solenoid valve is in an open state. Due to the presence of the column 42 in the auxiliary flow cavity 41, the diaphragm 2 does not deform evenly, but deforms unilaterally to a greater extent, such as Figure 4 As shown, at this time, the first end surface 31 of the magnetic core 3 is not parallel to the second end surface 231 of the protrusion 23 .

[0040] When the solenoid valve is powered off and the magnetic force binding the magnetic core 3 disappears, the magnetic core 3 moves toward the diaphragm 2 under the action of the reset spring. When the first end face 31 of the magnetic core 3 contacts the second end face 231 of the protrusion 23, an angle is formed between the first end face 31 and the second end face 231, as shown in FIG. Figure 5 As shown, the flow cross-section of the liquid outlet 22 is reduced, while the flow cross-section of the liquid inlet 21 remains unchanged. At this time, the amount of water entering the auxiliary flow chamber 41 is greater than the amount of water flowing out of the auxiliary flow chamber 41, causing the diaphragm 2 to gradually recover its deformation. During this process, the magnetic core 3, under the action of the reset spring, also gives the diaphragm 2 a force to recover its deformation. Therefore, before the diaphragm 2 recovers its deformation, the liquid outlet 22 remains open and will not be closed instantly by the magnetic core 3. When the diaphragm 2 recovers its deformation, its second end face 231 returns to a state parallel to and in contact with the first end face 31 of the magnetic core 3, as shown in FIG. Figure 6 As shown, the liquid outlet 22 is closed, and at the same time, the medium inlet 11 is disconnected from the medium outlet 12, and the solenoid valve returns to the closed state.

[0041] The present invention provides a method for reducing water hammer in a solenoid valve. When the liquid outlet 22 is open, the diaphragm 2 undergoes a larger unilateral deformation. This prevents the magnetic core 3 from instantly closing the liquid outlet 22 during rebound. Instead, it slowly closes the liquid outlet 22, thereby minimizing the water hammer effect. This not only protects the safety of the waterway and working components, but also eliminates noise caused by the water hammer effect. Furthermore, the present invention does not affect the opening time of the solenoid valve.

[0042] The above embodiments are only used to further illustrate a solenoid valve and a method for reducing water hammer effect thereof of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the technical solution of the present invention.

Claims

1. A solenoid valve comprising a solenoid valve body and a diaphragm, wherein a valve cavity and a magnetic core are disposed within the solenoid valve body, and the diaphragm is disposed within the valve cavity; the diaphragm is provided with a liquid inlet and a liquid outlet, and the solenoid valve body is provided with a medium inlet and a medium outlet, wherein the liquid inlet communicates with the medium inlet, the liquid outlet communicates with the medium outlet, and the liquid outlet is controlled to open and close by the magnetic core; when the liquid outlet is opened, the diaphragm deforms to connect the medium inlet and the medium outlet; and characterized in that: The solenoid valve body is provided with a restriction portion, which causes the diaphragm to produce uneven deformation when the liquid outlet is opened, so that the liquid outlet extends along with the magnetic core before the diaphragm recovers its deformation, and its flow cross section gradually decreases; The limiting portion is located in the valve cavity, the liquid outlet is located in the middle of the diaphragm, and the limiting portion is matched at an eccentric position of the diaphragm.

2. The solenoid valve according to claim 1, 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 located on the same side of the diaphragm; the liquid inlet hole connects the auxiliary flow cavity and the main flow cavity; when the liquid outlet hole is open, the medium inlet is connected to the medium outlet through the main flow cavity.

3. The solenoid valve according to claim 2, characterized in that: The limiting portion is located in the auxiliary flow cavity and abuts against the diaphragm, or a preset gap is provided between the limiting portion and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm.

4. The solenoid valve according to claim 2, characterized in that: The limiting portion is located in the main flow cavity and pulls the diaphragm.

5. The solenoid valve according to claim 3, characterized in that: The limiting portion is a column, the free end of which abuts against the diaphragm.

6. The solenoid valve according to claim 1, characterized in that: The solenoid valve body includes a valve housing and a valve cover, which are sealed and enclose the valve cavity; the magnetic core is arranged in the valve housing, and a reset spring is matched between the magnetic core and the valve housing; the medium inlet and the medium outlet are arranged on the valve cover.

7. The solenoid valve according to claim 1, characterized in that: The liquid outlet is opened and closed by the first end face of the magnetic core. A convex column is provided on the side of the magnetic core where the liquid outlet is located. The liquid outlet passes through the convex column. The end face of the free end of the convex column constitutes a second end face. In the deformed state of the diaphragm, the second end face is not parallel to the first end face.

8. A method for reducing water hammer effect using a solenoid valve, the solenoid valve comprising a solenoid valve body and a diaphragm, wherein a valve cavity and a magnetic core are disposed within the solenoid valve body, and the diaphragm is disposed within the valve cavity; the diaphragm is provided with a liquid inlet and a liquid outlet, and the solenoid valve body is provided with a medium inlet and a medium outlet, wherein the liquid inlet communicates with the medium inlet, and the liquid outlet communicates with the medium outlet, the liquid outlet being controlled to open and close by a first end surface of the magnetic core, and wherein when the liquid outlet is open, the diaphragm deforms to connect the medium inlet and the medium outlet; the method is characterized in that: The solenoid valve reduces the water hammer effect by controlling the uneven deformation of the diaphragm when the outlet hole is opened, so that the outlet hole extends along with the magnetic core before the diaphragm recovers its deformation, and its flow cross section gradually decreases. A restriction portion is provided in the valve cavity, and the restriction portion is matched with an eccentric position of the diaphragm. The restriction portion causes the diaphragm to generate uneven deformation when the liquid outlet is in an open state.

9. The method for reducing water hammer effect of a solenoid valve according to claim 8, characterized in that: The limiting portion and the magnetic core are located on the same side of the diaphragm, and the limiting portion presses against the diaphragm, or there is a preset gap between the limiting portion and the diaphragm, and the preset gap is smaller than the deformation stroke of the diaphragm; or the limiting portion and the magnetic core are located on different sides of the diaphragm, and the limiting portion pulls the diaphragm.

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