solenoid valve

Abstract

The application discloses an electromagnetic valve, which comprises a valve seat, a diaphragm, an electromagnet and a sealing medium. The valve seat is provided with a water inlet, a valve cavity and a water outlet which are sequentially communicated. The diaphragm is installed in the valve cavity. The electromagnet comprises an electromagnetic main body and a moving iron core. The electromagnetic main body is installed on the valve seat and is provided with a movable cavity extending along a first direction. The movable cavity is communicated with the valve cavity. The moving iron core is accommodated in the movable cavity and has a gap between the inner wall of the movable cavity. The moving iron core can move along the first direction. The sealing medium is filled in the movable cavity and is insoluble with the liquid. The movable cavity of the electromagnetic main body is filled with the sealing medium. During the use of the electromagnetic valve, the sealing medium can prevent the liquid transported in the pipeline from entering the gap between the movable cavity and the moving iron core, thereby preventing the foreign particles in the liquid from entering the gap between the movable cavity and the moving iron core, and effectively reducing the possibility of the moving iron core being stuck.

Description

Technical Field

[0001] This invention relates to the field of valve device technology, and in particular to a solenoid valve. Background Technology

[0002] A solenoid valve is a commonly used valve device. Its switching principle is that the coil of the solenoid body generates a magnetic field when energized, and the magnetic field disappears when the power is off. By controlling the energization of the coil, the moving iron core can move axially along the valve's inner cavity, thus opening and closing the pressure relief orifice. Solenoid valves can be used in liquids. When the pressure relief orifice is closed, the diaphragm is pressed against the outlet by water pressure, closing the valve. When the pressure relief orifice is open, water on one side of the diaphragm can be diverted through the orifice, creating a short-term low pressure. The water pressure on the other side pushes the diaphragm open, opening the valve. However, when a solenoid valve operates in a liquid, impurities or scale may be present, producing foreign particles. Because the gap between the inner wall of the solenoid body and the outer wall of the moving iron core is small, when liquid seeps into the inner cavity of the solenoid body, foreign particles can easily become stuck between the inner wall of the solenoid body and the moving iron core, causing the moving iron core to jam. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a solenoid valve in which a sealing medium is filled in the movable cavity of the solenoid body. During the use of the solenoid valve, the sealing medium can prevent the liquid transported in the pipeline from entering the gap between the movable cavity and the moving iron core, thereby preventing foreign particles in the liquid from entering the gap between the movable cavity and the moving iron core, thus effectively reducing the possibility of the moving iron core getting stuck.

[0004] The solenoid valve provided in this embodiment of the invention is applied in a pipeline for conveying liquid. The solenoid valve includes: a valve seat having an inlet, a valve chamber, and an outlet connected in sequence; a diaphragm installed in the valve chamber; an electromagnet including an electromagnetic body and a moving iron core, the electromagnetic body being installed in the valve seat, the electromagnetic body having a movable cavity extending along a first direction, the movable cavity being connected to the valve chamber; the moving iron core being housed in the movable cavity and having a gap between it and the inner wall of the movable cavity, the moving iron core being movable along the first direction, so that the diaphragm opens the valve chamber to connect the inlet and the outlet, or closes the valve chamber to isolate the inlet and the outlet; and a sealing medium located in the movable cavity and filling the gap between the moving iron core and the inner wall of the movable cavity, the sealing medium being immiscible with the liquid.

[0005] The solenoid valve provided in this embodiment of the invention has at least the following beneficial effects: the movable cavity of the solenoid body is filled with a sealing medium that is not miscible with liquid. During the use of the solenoid valve, the sealing medium can prevent the liquid transported in the pipeline from entering the gap between the movable cavity and the moving iron core, thereby preventing foreign particles in the liquid from entering the gap between the movable cavity and the moving iron core, thus effectively reducing the possibility of the moving iron core getting stuck.

[0006] In some embodiments of the present invention, the sealing medium is in liquid form.

[0007] In some embodiments of the present invention, the sealing medium is oil.

[0008] In some embodiments of the present invention, the moving iron core has a through hole for the sealing medium to flow through.

[0009] In some embodiments of the present invention, the moving iron core further has a receiving cavity extending along the first direction, the through hole extending from the inner wall of the receiving cavity to the outer surface of the moving iron core, the axis of the receiving cavity coincides with the axis of the moving iron core, and a plurality of through holes are provided, which are uniformly arranged in the circumferential direction of the moving iron core.

[0010] In some embodiments of the present invention, the moving iron core has a receiving cavity extending along the first direction, the axis of the receiving cavity coincides with the axis of the moving iron core, the through hole extends along a second direction perpendicular to the first direction, and on the axial section of the moving iron core, the edge of the through hole is flush with the bottom wall of the receiving cavity.

[0011] In some embodiments of the present invention, the through hole extends from one end of the moving iron core near the bottom wall of the movable cavity to the side wall of the moving iron core.

[0012] In some embodiments of the present invention, the viscosity of the sealing medium is 1 to 10 times that of water.

[0013] In some embodiments of the present invention, the electromagnet is located above the valve seat, and the density of the sealing medium is less than that of the liquid; or, the electromagnet is located below the valve seat, and the density of the sealing medium is greater than that of the liquid.

[0014] In some embodiments of the present invention, the sealing medium is also filled between the moving iron core and the bottom wall of the movable cavity.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 A perspective view of a solenoid valve provided for some embodiments of the present invention;

[0018] Figure 2 for Figure 1 The diagram shown is a three-dimensional schematic of the solenoid valve after being cut open at section AA.

[0019] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the solenoid valve in the closed state at section AA.

[0020] Figure 4 for Figure 1 The diagram shows a cross-sectional view of the solenoid valve in the closed state at section BB.

[0021] Figure 5 for Figure 1 The solenoid valve shown is in the open state, in section AA.

[0022] Figure 6 for Figure 1 The solenoid valve is shown as a cross-sectional view at section BB with the valve in the open state.

[0023] Figure 7 A cross-sectional view of the electromagnet of a solenoid valve provided for other embodiments of the present invention.

[0024] Figure label:

[0025] Valve seat 100, inlet 110, first cavity 121, second cavity 122, third cavity 123, fourth cavity 124, outlet 125, pressure relief channel 126, first pressure relief section 1261, second pressure relief section 1262, first balancing channel 127, outlet 130, valve body 140, valve cover 150, main body 151, first insertion part 152, second insertion part 153, third insertion part 154, diaphragm 200, second balancing channel 210, electromagnet 300, electromagnetic body 310, movable cavity 311, moving iron core 320, receiving cavity 321, through hole 322, sealing medium 400, elastic element 500, first sealing element 600, second sealing element 700. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0029] In the description of this invention, references to terms such as "one embodiment," "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] Reference Figures 1 to 6 The solenoid valve provided in this embodiment of the invention includes a valve seat 100, a diaphragm 200, an electromagnet 300, and a sealing medium 400. The valve seat 100 has an inlet 110, a valve chamber, and an outlet 130 connected in sequence. The diaphragm 200 is installed in the valve chamber. The electromagnet 300 includes an electromagnetic body 310 and a moving iron core 320. The electromagnetic body 310 is installed in the valve seat 100 and has a movable cavity 311 extending along a first direction, which is connected to the valve chamber. The moving iron core 320 is housed in the movable cavity 311 and has a gap between it and the inner wall of the movable cavity 311. The moving iron core 320 can move along the first direction to allow the diaphragm 200 to open the valve chamber to connect the inlet 110 and the outlet 130, or to close the valve chamber to isolate the inlet 110 and the outlet 130. The sealing medium 400 is filled in the movable cavity 311 and is immiscible with the liquid.

[0031] The solenoid valve provided in this embodiment of the invention is used in a pipeline for conveying liquid. The solenoid valve has a closed state and an open state. In the closed state, refer to... Figure 3 and Figure 4 The moving iron core 320 is located on the bottom wall of the movable cavity 311 in the first direction. At this time, the diaphragm 200 closes the valve cavity, isolating the inlet 110 and the outlet 130, so that the liquid transported by the pipeline cannot flow from the inlet 110 to the outlet 130; in the open state, refer to Figure 5 and Figure 6The moving iron core 320 is located in the first direction near the bottom wall of the movable cavity 311. At this time, the diaphragm 200 opens the valve cavity, and the inlet 110 and the outlet 130 are connected, so that the liquid transported by the pipeline flows from the inlet 110 to the outlet 130.

[0032] The solenoid valve provided in this embodiment of the invention is used in pipelines for conveying liquids. The movable cavity 311 of the solenoid body 310 is filled with a sealing medium 400. During the use of the solenoid valve, the sealing medium 400 can prevent the liquid conveyed in the pipeline from entering the gap between the movable cavity 311 and the moving iron core 320, thereby preventing foreign particles in the liquid from entering the gap between the movable cavity 311 and the moving iron core 320, thus effectively reducing the possibility of the moving iron core 320 getting stuck. In addition, the sealing medium 400 wraps around the surface of the moving iron core 320, which can effectively reduce the surface area of ​​the moving iron core 320 in contact with the conveyed liquid or air, thereby reducing the possibility of corrosion of the moving iron core 320 and improving the service life of the solenoid valve.

[0033] Furthermore, the sealing medium 400 is in liquid form. During the operation of the moving iron core 320, the friction between the surface of the moving iron core 320 and the sealing medium 400 is very small, and the sealing medium 400 will not affect the normal operation of the moving iron core 320. Specifically, oil can be used as the sealing medium 400.

[0034] It should be noted that in order to ensure the normal operation of the moving iron core 320, the sealing medium 400 should be a liquid with a viscosity coefficient that is the same as or slightly greater than that of water. Specifically, a liquid with a viscosity coefficient within 10 times that of water can be selected.

[0035] Understandably, to avoid contaminating the conveying liquid with the sealing medium 400, a non-toxic and harmless liquid should be selected as the sealing medium 400. To prevent the sealing medium 400 from corroding the inner wall of the movable cavity 311 and the moving iron core 320, a liquid that does not readily react with metals should be selected as the sealing medium 400. To prevent the inner wall of the movable cavity 311 and the moving iron core 320 from reacting with components in the air and causing corrosion, a liquid that is poorly soluble in air should be selected as the sealing medium 400.

[0036] To ensure that the sealing medium 400 remains within the movable cavity 311 during use, a water-insoluble and non-volatile liquid should be selected as the sealing medium 400. Furthermore, the density of the sealing medium 400 should be selected according to the structure of the solenoid valve. Specifically, if the electromagnet 300 is located above the valve seat 100 and the movable cavity 311 is located above the liquid within the valve seat 100, a liquid with a density lower than the conveying liquid should be selected as the sealing medium 400, allowing it to float above the conveying liquid and remain within the movable cavity 311 above the conveying liquid. If the electromagnet 300 is located below the valve seat 100 and the movable cavity 311 is located below the liquid within the valve seat 100, a liquid with a density greater than the conveying liquid should be selected as the sealing medium 400, allowing it to sink below the conveying liquid and remain within the movable cavity 311 below the conveying liquid.

[0037] It should be further explained that during the assembly of the solenoid valve, a sealing medium 400 must first be added to the movable cavity 311, and then the moving iron core 320 is placed into the movable cavity 311. Under the compression of the moving iron core 320, the sealing medium 400 fills the space between the moving iron core 320 and the inner wall of the movable cavity 311. When the solenoid 300 is positioned above the valve seat 100, in order to prevent the sealing medium 400 from flowing out, the sealing medium 400 needs to have a large surface tension, and the gap between the moving iron core 320 and the inner wall of the movable cavity 311 should be small. Specifically, the gap between the moving iron core 320 and the inner wall of the movable cavity 311 can be set to 0.2 mm.

[0038] The structure of the valve cavity can be configured according to actual needs. For example, in some embodiments, refer to... Figures 2 to 6 The valve chamber includes a first chamber 121, a second chamber 122, a third chamber 123, a fourth chamber 124, a water inlet 125, a pressure relief channel 126, and a first balancing channel 127. The first chamber 121 and the second chamber 122 are connected through the water inlet 125, the third chamber 123 and the fourth chamber 124 are connected through the first balancing channel 127, the fourth chamber 124 and the second chamber 122 are connected through the pressure relief channel 126, and the fourth chamber 124 is connected to the movable chamber 311. The moving iron core 320 is also included. The moving iron core 320 is housed in the fourth cavity 124 and can open or block the connection between the pressure relief channel 126 and the fourth cavity 124. The diaphragm 200 is installed between the third cavity 123 and the first cavity 121 and can block or open the water outlet 125. The diaphragm 200 has a second balance channel 210. The first cavity 121 and the third cavity 123 are connected through the second balance channel 210. The first cavity 121 is connected to the water inlet 110 and the second cavity 122 is connected to the water outlet 130.

[0039] Reference Figure 3 and Figure 4 When the solenoid valve is closed, the end of the moving iron core 320 away from the bottom wall of the movable cavity 311 blocks the connection between the pressure relief channel 126 and the fourth cavity 124. The liquid transported by the pipeline enters from the inlet 110 and passes through and fills the first cavity 121, the second balance channel 210, the third cavity 123, the first balance channel 127 and the fourth cavity 124 in sequence. Since the moving iron core 320 blocks the connection between the pressure relief channel 126 and the fourth cavity 124, it cannot continue to transport liquid. At this time, the pressure on the side of the diaphragm 200 near the third cavity 123 is greater than the pressure on the side of the diaphragm 200 near the second cavity 122. Therefore, the diaphragm 200 is pressed tightly at the outlet 125, so that the first cavity 121 and the second cavity 122 are isolated from each other, thereby preventing the liquid transported by the pipeline from flowing from the inlet 110 to the second cavity 122 and the outlet 130.

[0040] Reference Figure 5 and Figure 6 When the solenoid valve is open, the end of the moving iron core 320 away from the bottom wall of the movable cavity 311 is disconnected from the connection between the pressure relief channel 126 and the fourth cavity 124, thus opening the pressure relief channel 126. The liquid in the fourth cavity 124 flows through the pressure relief channel 126 to the second cavity 122, increasing the pressure in the second cavity 122 until the pressure on the side of the diaphragm 200 near the second cavity 122 is greater than the pressure on the side of the diaphragm 200 near the third cavity 123. This causes the diaphragm 200 to deform under the pressure difference on both sides and detach from the water outlet 125. This allows the first cavity 121 and the second cavity 122 to be directly connected through the water outlet 125, enabling the liquid transported by the pipeline to flow from the inlet 110 through the first cavity 121 and the second cavity 122 to the outlet 130.

[0041] Set the valve chamber as follows Figures 3 to 6 The pilot-operated solenoid valve shown has a structure in which, when switching the open and closed states of the solenoid valve, the moving iron core 320 only needs to block or open the pressure relief channel 126 with a smaller flow rate. Therefore, the driving force required for the moving iron core 320 is small, and the switching action can be achieved by using a small-power electromagnet. This helps to reduce the size of the solenoid valve and reduce its energy consumption.

[0042] Furthermore, referring to Figures 2 to 6The pressure relief channel 126 includes a first pressure relief section 1261 and a second pressure relief section 1262 that are interconnected. The first pressure relief section 1261 is connected to the fourth cavity 124, and the second pressure relief section 1262 is connected to the second cavity 122. The valve seat 100 includes a valve body 140 and a valve cover 150. The valve cover 150 is mounted on the valve body 140. The valve body 140 has a first cavity 121, a second cavity 122, a third cavity 123, and a second pressure relief section 1262. The valve cover 150 has a fourth cavity 124, a first balance channel 127, and a first pressure relief section 1261. Distributing the different parts of the valve cavity onto the valve body 140 and the valve cover 150 facilitates processing and helps reduce manufacturing costs.

[0043] Furthermore, referring to Figures 2 to 6 The valve cover 150 includes a main body 151, a first insertion part 152, a second insertion part 153, and a third insertion part 154. The first insertion part 152 is located on one side of the main body 151, while the second insertion part 153 and the third insertion part 154 are both located on the side of the main body 151 away from the first insertion part 152. The fourth cavity 124 is located in the third insertion part 154. The electromagnetic body 310 is inserted into the fourth cavity 124, the second insertion part 153 is inserted into the third cavity 123, and the third insertion part 154 is inserted into the second pressure relief section 1262. The valve cover 150 and the valve body 140 are connected by an insertion joint, which facilitates installation and positioning and helps ensure installation accuracy.

[0044] Furthermore, referring to Figures 2 to 6 The solenoid valve also includes a first seal 600 and a second seal 700. The first seal 600 is clamped between the solenoid body 310 and the inner wall of the fourth cavity 124. The second seal 700 is clamped between the third insertion part 154 and the inner wall of the second pressure relief section 1262. The diaphragm 200 is clamped between the second insertion part 153 and the inner wall of the third cavity 123. The joint between the valve body 140 and the valve cover 150 is sealed, which can reduce the possibility of liquid leakage of the solenoid valve and improve the reliability of the solenoid valve.

[0045] During operation, the solenoid valve requires the moving iron core 320 to move in two opposite directions along the movable chamber 311 to switch between the open and closed states. To simplify the control logic and reduce the energy consumption of the solenoid valve, refer to... Figures 2 to 6The solenoid valve also includes an elastic element 500, which is arranged along a first direction. One end of the elastic element 500 is connected to the moving iron core 320, and the other end is connected to the solenoid body 310. Specifically, the elastic element 500 can be configured to be in a compressed state when closed. Under the elastic force of the elastic element 500, the moving iron core 320 presses against the valve cover 150, so that the moving iron core 320 can stably block the connection between the pressure relief channel 126 and the fourth cavity 124. When it is necessary to switch the solenoid valve from the closed state to the open state, the coil in the solenoid body 310 is energized to generate a magnetic field, which drives the moving iron core 320 to move away from the valve cover 150 to disengage from the valve cover 150 and open the pressure relief channel 126. At the connection point between pressure relief channel 126 and fourth cavity 124, the elastic element 500 is further compressed, and the magnetic force on the moving iron core 320 is balanced with the elastic force of the elastic element 500. When it is necessary to switch the solenoid valve from the open state to the closed state, the coil of the solenoid body 310 is de-energized, the magnetic field disappears, and the moving iron core 320 loses the effect of the magnetic force. Under the action of the elastic force of the elastic element 500, the moving iron core 320 moves towards the valve cover 150 until it blocks the connection between the pressure relief channel 126 and fourth cavity 124. The solenoid body 310 only needs to be energized when the solenoid valve needs to be switched to the open state and de-energized when it needs to be switched to the closed state. The control logic is relatively simple and helps to reduce energy consumption.

[0046] Furthermore, referring to Figures 2 to 6 The moving iron core 320 has a receiving cavity 321 extending along the first direction, and the elastic member 500 is partially housed in the receiving cavity 321, which can save installation space and help reduce the size of the electromagnet 300.

[0047] As the moving iron core 320 moves within the movable cavity 311, the space between the end of the moving iron core 320 closest to the bottom wall of the movable cavity 311 and the bottom wall of the movable cavity 311 changes. When the moving iron core 320 moves away from the bottom wall of the movable cavity 311, this space increases, generating a negative pressure that causes the sealing medium 400 to flow into this space. When the moving iron core 320 moves closer to the bottom wall of the movable cavity 311, this space decreases, causing the sealing medium 400 to flow out of this space. The negative or positive pressure that forces the sealing medium 400 to flow also generates resistance that hinders the movement of the moving iron core 320. This resistance will cause the movement of the moving iron core 320 to be obstructed, thereby increasing the energy consumption of the solenoid valve.

[0048] Based on this, refer to Figures 2 to 6The moving iron core 320 also has a through hole 322, which extends from the inner wall of the receiving cavity 321 to the outer surface of the moving iron core 320. When the moving iron core 320 moves away from the bottom wall of the movable cavity 311, a negative pressure is generated in the space between the end of the moving iron core 320 near the bottom wall of the movable cavity 311 and the bottom wall of the movable cavity 311. The sealing medium 400 can enter this space through the through hole 322 and the receiving cavity 321, and can also enter through the outer side of the moving iron core 320. The space between the inner wall of the movable cavity 311 and the wall of the inner wall enters the space. When the moving iron core 320 moves towards the bottom wall of the movable cavity 311, a positive pressure is generated in the space between the end of the moving iron core 320 near the bottom wall of the movable cavity 311 and the bottom wall of the movable cavity 311. The sealing medium 400 in this space can flow out through the receiving cavity 321 and the through hole 322, and can also flow out through the gap between the outer wall of the moving iron core 320 and the inner wall of the movable cavity 311. The through hole 322 can effectively shorten the flow path length of the sealing medium 400, thereby reducing the resistance encountered by the moving iron core 320 during operation, improving the smoothness of the operation of the moving iron core 320, and reducing the energy consumption of the solenoid valve.

[0049] Reference Figures 3 to 6 The axis of the receiving cavity 321 and the axis of the moving iron core 320 are both axis C. Multiple through holes 322 are provided, and the multiple through holes 322 are evenly arranged in the circumferential direction of the moving iron core 320. The sealing medium 400 can flow evenly in the circumferential direction of the moving iron core 320, so that the force on the moving iron core 320 in the circumferential direction is more balanced, which is conducive to improving the stability of the movement of the moving iron core 320.

[0050] Reference Figures 3 to 6 The axis of the receiving cavity 321 and the axis of the moving iron core 320 are both axis C. The through hole 322 extends along a second direction perpendicular to the first direction. On the axial section of the moving iron core 320, the edge of the through hole 322 is flush with the bottom wall of the receiving cavity 321, so that the liquid in the receiving cavity 321 can flow smoothly into the through hole 322, and the liquid in the through hole 322 can also flow smoothly into the receiving cavity 321, which can further reduce the resistance encountered by the moving iron core 320 during operation.

[0051] The solution of providing a through hole 322 to reduce the operating resistance of the moving iron core 320 is not limited to the above-described solution. In other embodiments, refer to... Figure 7The end of the automatic iron core 320 near the bottom wall of the movable cavity 311 extends to the side wall of the moving iron core 320. When the moving iron core 320 moves away from the bottom wall of the movable cavity 311, a negative pressure is generated in the space between the end of the moving iron core 320 near the bottom wall of the movable cavity 311 and the bottom wall of the movable cavity 311. The sealing medium 400 can enter the space through the through hole 322 or through the gap between the outer side wall of the moving iron core 320 and the inner side wall of the movable cavity 311. When the moving iron core 320 moves towards the bottom wall of the movable cavity 311, a positive pressure is generated in the space between the end of the moving iron core 320 near the bottom wall of the movable cavity 311 and the bottom wall of the movable cavity 311. The sealing medium 400 in the space can flow out through the through hole 322 or through the gap between the outer side wall of the moving iron core 320 and the inner side wall of the movable cavity 311. Similarly, it can effectively shorten the flow path of the sealing medium 400, thereby reducing the resistance encountered by the moving iron core 320 during operation, improving the smoothness of the movement of the moving iron core 320, and reducing the energy consumption of the solenoid valve.

[0052] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A solenoid valve, used in pipelines for conveying liquids, characterized in that, The solenoid valve includes: The valve seat has an inlet, a valve chamber, and an outlet connected in sequence. A diaphragm is installed in the valve cavity; An electromagnet includes an electromagnetic body and a moving iron core. The electromagnetic body is mounted on the valve seat and has a movable cavity extending along a first direction, which communicates with the valve cavity. The moving iron core is housed in the movable cavity and has a gap between it and the inner wall of the movable cavity. The moving iron core is movable along the first direction to allow the diaphragm to open the valve cavity to connect the inlet and the outlet, or to close the valve cavity to isolate the inlet and the outlet. A sealing medium is located in the movable cavity and fills the gap between the moving iron core and the inner wall of the movable cavity. The sealing medium is immiscible with the liquid and is in liquid form. The sealing medium also fills the space between the moving iron core and the bottom wall of the movable cavity.

2. The solenoid valve according to claim 1, characterized in that, The sealing medium is oil.

3. The solenoid valve according to claim 1, characterized in that, The moving iron core has a through hole for the sealing medium to flow through.

4. The solenoid valve according to claim 3, characterized in that, The moving iron core also has a receiving cavity extending along the first direction. The through hole extends from the inner wall of the receiving cavity to the outer surface of the moving iron core. The axis of the receiving cavity coincides with the axis of the moving iron core. Multiple through holes are provided, and the multiple through holes are evenly arranged in the circumferential direction of the moving iron core.

5. The solenoid valve according to claim 3, characterized in that, The moving iron core has a receiving cavity extending along the first direction, the axis of the receiving cavity coincides with the axis of the moving iron core, the through hole extends along a second direction perpendicular to the first direction, and on the axial section of the moving iron core, the edge of the through hole is flush with the bottom wall of the receiving cavity.

6. The solenoid valve according to claim 3, characterized in that, The through hole extends from one end of the moving iron core near the bottom wall of the movable cavity to the side wall of the moving iron core.

7. The solenoid valve according to claim 1, characterized in that, The viscosity of the sealing medium is 1 to 10 times that of water.

8. The solenoid valve according to claim 1, characterized in that, The electromagnet is located above the valve seat, and the density of the sealing medium is less than that of the liquid; Alternatively, the electromagnet may be located below the valve seat, and the density of the sealing medium may be greater than that of the liquid.

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