Electromagnetic valve and oxygen generator
By designing multiple flow control mechanisms in the solenoid valve, the medium exerts equal forces on the push rod in opposite directions, solving the problems of overheating and unstable performance of the winding coil under high-pressure conditions, and achieving low-power control and stable operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO JIAYIN ELECTRICAL & MECHANICAL TECH CO LTD
- Filing Date
- 2026-02-24
- Publication Date
- 2026-05-05
AI Technical Summary
Existing solenoid valves require increased winding coil power under high-pressure conditions to overcome medium resistance, which leads to overheating of the winding coil, shortened service life, and unstable performance.
Design an electromagnetic valve by setting multiple flow control mechanisms in the valve body. Each mechanism includes a winding coil, an iron core assembly, and a push rod. The medium exerts equal forces on the push rod in opposite directions, thereby offsetting the motion resistance of the push rod. The push rod is controlled by a low-power winding coil.
Under high-pressure conditions, the heat generated by the winding coil is reduced, the service life is extended, and the working stability of the solenoid valve is ensured.
Smart Images
Figure CN224201220U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of flow control technology, and in particular to a solenoid valve and an oxygen generator. Background Technology
[0002] In the overall structure of the oxygen concentrator, the air passage between the air compressor and the molecular sieve adsorption tower is controlled by a solenoid valve. When the winding coil in the solenoid valve is energized or de-energized, it controls the internal moving iron core to drive the push rod, thereby opening or closing the solenoid valve orifice and controlling the air passage.
[0003] Currently, in existing solenoid valves, the internal push rod must overcome the resistance of the medium flowing through the valve during operation. Under high-pressure conditions (medium pressure ≥ 2.0 bar), this resistance increases significantly, requiring the winding coil to output a larger driving force to actuate the push rod. Therefore, the solenoid valve's structural design typically necessitates increasing the winding coil power to adapt to high-pressure environments. However, increasing the winding coil power significantly increases the heat generated during operation, which can easily lead to overheating of the winding coil, shorten its lifespan, and potentially cause solenoid valve performance failure, thus affecting the valve's operational stability. Utility Model Content
[0004] In view of this, it is necessary to provide a solenoid valve and an oxygen generator that can solve the above-mentioned technical problems.
[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:
[0006] A solenoid valve, the solenoid valve comprising:
[0007] The valve body has an inlet, an outlet, and multiple connecting ports; wherein the inlet can be simultaneously connected to multiple connecting ports respectively, and the inlet and the outlet are disconnected from each other; the outlet can also be simultaneously connected to multiple connecting ports respectively.
[0008] Multiple flow control mechanisms are configured one-to-one with multiple communication ports. Each flow control mechanism is used to control the corresponding communication port to selectively connect with either the inlet or the outlet. Each flow control mechanism includes a winding coil, an iron core assembly, and a push rod. The push rod passes through the valve body and is connected and fixed to the movable iron core of the iron core assembly. The winding coil is sleeved on the iron core assembly, and when the winding coil is energized, it can drive the movable iron core to move the push rod along a first direction, so that the corresponding communication port switches from connecting with the inlet to connecting with the outlet.
[0009] When the push rod moves along the first direction, the first force exerted by the medium introduced by the inlet on the push rod in the second direction opposite to the first direction is equal to the second force exerted by the medium on the push rod in the first direction.
[0010] In one embodiment, the valve body further has a first valve port and a second valve port corresponding to the communication port. The communication port can communicate with the inlet through the corresponding first valve port and with the outlet through the corresponding second valve port.
[0011] The push rod is provided with a first sealing gasket and a second sealing gasket. The push rod can block the first valve port through the first sealing gasket and can block the second valve port through the second sealing gasket. The push rod also forms a sliding boss, which is disposed on the side of the first sealing gasket facing the movable iron core and is slidably connected to the valve body.
[0012] When the push rod moves along the first direction, the first sealing gasket is subjected to a first force from the medium in the second direction; the sliding boss and the second sealing gasket are both subjected to a force from the medium in the first direction, and the sum of the two is equal to the second force.
[0013] In one embodiment, the first sealing gasket includes a first part and a second part, the second part is disposed on the outer wall of the first part and connected to the first part, and the first sealing gasket can block the first valve port through the connection between the first part and the second part;
[0014] Wherein, the projected area of the first part in the first direction is equal to the projected area of the sliding boss in the second direction; and the projected area of the second part in the first direction is equal to the area of the portion located outside the second valve port when the second sealing gasket blocks the second valve port.
[0015] In one embodiment, the valve body has a clearance groove at the location of the second valve port, and the medium introduced by the inlet can enter the clearance groove and act on the second sealing gasket.
[0016] In one embodiment, the top rod has a partition portion, a first guide portion and a second guide portion, the first guide portion and the second guide portion being disposed on two opposite sides of the partition portion, wherein the first guide portion is capable of limiting the first sealing gasket to the partition portion, and the second guide portion is capable of limiting the second sealing gasket to the partition portion;
[0017] The first guide portion has a first guide slope, which guides the medium introduced by the inlet to flow to the corresponding communication port; the second guide portion has a second guide slope, which guides the medium introduced by the communication port to flow to the outlet.
[0018] In one embodiment, the core assembly further includes an elastic element that can drive the movable core to move the push rod along the second direction when the winding coil is de-energized, so that the corresponding connection port switches from being connected to the outlet to being connected to the inlet;
[0019] When the push rod moves along the second direction, the third force exerted by the medium introduced through the communication port on the push rod in the second direction is equal to the fourth force exerted by the medium on the push rod in the first direction.
[0020] In one embodiment, the valve body further has a second valve port corresponding to the communication port, and the communication port can be connected to the outlet through the corresponding second valve port;
[0021] The push rod is provided with a first sealing gasket and a second sealing gasket, and the push rod can block the second valve port through the second sealing gasket; wherein, the push rod also forms a push rod head, which is located on the side of the second sealing gasket away from the movable iron core and can be inserted and cooperated with the valve body;
[0022] When the push rod moves along the second direction, the second sealing gasket is subjected to a fourth force from the medium in the first direction; the push rod head and the first sealing gasket are both subjected to the force from the medium in the second direction, and the sum of the two is equal to the third force.
[0023] In one embodiment, the number of the connection ports is configured to be two.
[0024] In one embodiment, the top rod is configured as a one-piece structure;
[0025] The top rod also has a plug-in part, which is inserted into the movable iron core and connected to the movable iron core.
[0026] This application also claims protection for an automotive oxygen concentrator, including the solenoid valve described above.
[0027] Due to the application of the above solution, this application has the following advantages compared with the prior art:
[0028] The solenoid valve and oxygen generator claimed in this application, when the winding coil is energized, cause the movable iron core to move the push rod in a first direction. During this process, the first force exerted by the medium introduced through the inlet on the push rod in the first direction is equal in magnitude to the second force exerted by the medium on the push rod in the second direction. This allows the forces exerted by the medium on the push rod in the two opposite directions to cancel each other out, so that the movement of the push rod in the first direction is not affected by the medium inside the solenoid valve. Under high-pressure conditions, the solenoid valve can control the movement of the push rod in the first direction using a low-power winding coil. This reduces the heat generated by the winding coil during the operation of the solenoid valve, thereby extending the service life of the winding coil and ensuring the overall performance and operational stability of the solenoid valve. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a schematic diagram of the solenoid valve provided in this application.
[0031] Figure 2 An exploded view of the solenoid valve provided in this application.
[0032] Figure 3 This is a cross-sectional view of the solenoid valve provided in this application when it is de-energized.
[0033] Figure 4 For this application Figure 3 Enlarged view of the middle P section.
[0034] Figure 5 This is a cross-sectional view of the solenoid valve provided in this application when it is energized.
[0035] Figure 6 This is a schematic diagram of the valve body provided in this application.
[0036] Reference numerals: 100, Solenoid valve; 10, Valve body; 101, Clearance groove; 11, Inlet; 12, Outlet; 13, Connecting port; 131, First connecting port; 132, Second connecting port; 14, First valve port; 15, Second valve port; 16, Valve body; 17, Valve cover; 20, Flow control mechanism; 21, Winding coil; 221, Movable iron core; 222, Elastic element; 223, Fixed iron core; 23, Push rod; 231. Sliding boss; 232. Partition plate; 233. First guide section; 2331. First guide slope; 234. Second guide section; 2341. Second guide slope; 235. Top rod head; 236. Insertion section; 24. First sealing gasket; 241. First part; 242. Second part; 25. Second sealing gasket; 251. Third part; 252. Fourth part; 26. First sealing ring; 27. Second sealing ring. Detailed Implementation
[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.
[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.
[0042] like Figures 1 to 6 As shown, the solenoid valve 100 provided in this application includes a valve body 10 and multiple flow control mechanisms 20. The valve body has an inlet 11, an outlet 12, and multiple connecting ports 13. The inlet 11 can be simultaneously connected to multiple connecting ports 13, and the inlet 11 is disconnected from the outlet 12. The outlet 12 can also be simultaneously connected to multiple connecting ports 13. Each flow control mechanism 20 is correspondingly arranged with one of the multiple connecting ports 13, and each flow control mechanism 20 is used to control one of the corresponding connecting ports 13 to selectively connect to either the inlet 11 or the outlet 12. Each flow control mechanism 20 includes a winding wire. The valve body 10 includes a coil 21, a core assembly, and a push rod 23. The push rod 23 passes through the valve body 10 and is fixedly connected to the movable core 221 of the core assembly. A winding coil 21 is sleeved on the core assembly, and when the winding coil 21 is energized, it drives the movable core 221 to move the push rod 23 along a first direction, so that the corresponding connection port 13 switches from being connected to the inlet 11 to being connected to the outlet 12. When the push rod 23 moves along the first direction, the first force exerted on the push rod 23 by the medium introduced from the inlet 11 in a second direction opposite to the first direction is equal to the second force exerted on the push rod 23 by the medium in the first direction. Here, the medium can be gas, liquid, etc. The first direction in this application refers to the direction in which the movable core 221 drives the push rod 23 to release the blockage of the second valve port 15, and the second direction refers to the direction in which the movable core 221 drives the push rod 23 to block the second valve port 15.
[0043] As can be seen from the above, after the winding coil 21 of the solenoid valve 100 of this application is energized, the movable iron core 221 drives the push rod 23 to move in the first direction. During this process, the first force exerted by the medium introduced by the inlet 11 on the push rod 23 in the first direction is equal in magnitude to the second force exerted by the medium on the push rod 23 in the second direction. This allows the forces exerted by the medium on the push rod 23 in the two opposite directions to cancel each other out, so that the movement of the push rod 23 in the first direction is not affected by the medium inside the solenoid valve 100. Under high pressure conditions, the solenoid valve 100 can control the movement of the push rod 23 in the first direction using a low-power winding coil 21. This reduces the heat generated by the winding coil 21 when the solenoid valve 100 is working, thereby extending the service life of the winding coil 21 and ensuring the overall performance and working stability of the solenoid valve 100.
[0044] In this application, the number of flow control mechanisms 20 is configured as two; correspondingly, the number of connecting ports 13 is configured as two, specifically a first connecting port 131 and a second connecting port 132, which are respectively connected in parallel with the inlet 11 and the outlet 12. Of course, those skilled in the art will know that the number of flow control mechanisms 20 can also be set to three, four or even more according to actual needs, which will not be elaborated here.
[0045] like Figure 3 , Figure 4 , Figure 6 As shown, in one embodiment, the valve body 10 includes a valve body 16 and a valve cover 17, the valve cover 17 covering the valve body 16 and fixed to the valve body 16. The valve body 10 also has a first valve port 14 and a second valve port 15 corresponding to the communication port 13. The first valve port 14 is located on the valve body 16, and the second valve port 15 is located on the valve cover 17. The communication port 13 can communicate with the inlet 11 through the corresponding first valve port 14 and with the outlet 12 through the corresponding second valve port 15. The push rod 23 is provided with a first sealing gasket 24 and a second sealing gasket 25. The push rod 23 can block the first valve port 14 through the first sealing gasket 24 and block the second valve port 15 through the second sealing gasket 25. The push rod 23 also forms a sliding boss 231, which is located on the side of the first sealing gasket 24 facing the movable iron core 221 and is slidably connected to the valve body 10. When the push rod 23 moves in the first direction, the first sealing gasket 24 is subjected to a first force of the medium in the second direction. The sliding boss 231 and the second sealing gasket 25 are both subjected to the force of the medium in the first direction, and the sum of the two is equal to the second force.
[0046] In this embodiment, a first sealing ring 26 is assembled between the sliding boss 231 and the valve body 10 for sealing the sliding boss 231 and the valve body 10.
[0047] like Figure 3 , Figure 4 As shown, in one embodiment, the first sealing gasket 24 includes a first part 241 and a second part 242. The second part 242 is disposed on the outer wall of the first part 241 and connected to the first part 241. The first sealing gasket 24 can block the first valve port 14 through the connection between the first part 241 and the second part 242. The projected area of the first part 241 in the first direction is equal to the projected area of the sliding boss 231 in the second direction. The projected area of the second part 242 in the first direction is equal to the area of the portion of the second sealing gasket 25 located outside the second valve port 15 when it blocks the second valve port 15. In other words, the solenoid valve 100 of this embodiment achieves a sum of the projected area of the first sealing gasket 24 in the first direction, the projected area of the sliding boss 231 in the second direction, and the projected area of the outer portion of the second sealing gasket 25 when it blocks the second valve port 15 in the second direction. Since the medium is the same and the pressure is consistent, when the push rod 23 moves along the first direction, the total force exerted by the medium in the first direction on the sliding boss 231 and the portion of the second sealing gasket 25 outside the second valve port 15 when it blocks the second valve port 15 can cancel each other out with the force exerted by the medium in the second direction on the first sealing gasket 24. No additional balancing structure is required, thereby simplifying the overall structure of the solenoid valve 100.
[0048] like Figure 3 , Figure 4 As shown, in one embodiment, the valve body 10 has a relief groove 101 at the location of the second valve port 15. The medium introduced by the inlet 11 can enter the relief groove 101 and act on the second sealing gasket 25. That is, when the second sealing gasket 25 blocks the second valve port 15, the relief groove 101 in this embodiment can provide a flow channel for the medium, so that the medium can act on the part of the second sealing gasket 25 located outside the second valve port 15 in the first direction. Based on this, the force of the medium on the part of the second sealing gasket 25 located outside the second valve port 15 in the first direction can be canceled out by the force of the medium on the second part 242 of the first sealing gasket 24 in the second direction.
[0049] like Figure 4As shown, in one embodiment, the push rod 23 has a partition portion 232, a first guide portion 233, and a second guide portion 234. The first guide portion 233 and the second guide portion 234 are disposed on two opposite sides of the partition portion 232. The first guide portion 233 can limit the first sealing gasket 24 to the partition portion 232, and the second guide portion 234 can limit the second sealing gasket 25 to the partition portion 232. The first guide portion 233 has a first guide slope 2331, which can guide the medium introduced by the inlet 11 to the corresponding connecting port 13. The second guide portion 234 has a second guide slope 2341, which can guide the medium introduced by the connecting port 13 to the outlet 12.
[0050] like Figure 3 As shown, in one embodiment, the core assembly further includes an elastic element 222, which can drive the movable core 221 to move the push rod 23 in the second direction when the winding coil 21 is de-energized, so that the corresponding connection port 13 switches from being connected to the outlet 12 to being connected to the inlet 11; when the push rod 23 moves in the second direction, the third force exerted by the medium introduced by the connection port 13 on the push rod 23 in the second direction is equal to the fourth force exerted by the medium on the push rod 23 in the first direction.
[0051] In one embodiment, the push rod 23 further forms a push rod head 235, which is disposed on the side of the second sealing gasket 25 away from the movable iron core 221 and can be inserted and engaged with the valve body 10; when the push rod 23 moves in the second direction, the second sealing gasket 25 is subjected to a fourth force of the medium in the first direction; the push rod head 235 and the first sealing gasket 24 are both subjected to the force of the medium in the second direction, and the sum of the two is equal to the third force.
[0052] In one embodiment, the second sealing gasket 25 includes a third part 251 and a fourth part 252. The fourth part 252 is disposed on the outer wall of the third part 251 and connected to the third part 251. The second sealing gasket 25 can block the second valve port 15 through the connection between the third part 251 and the fourth part 252. The projected area of the third part 251 in the first direction is equal to the projected area of the push rod head 235 in the second direction. The projected area of the fourth part 252 in the first direction is equal to the projected area of the second part 242 in the second direction. In other words, the solenoid valve 100 in this embodiment makes the projected area of the second sealing gasket 25 in the first direction equal to the sum of the projected areas of the push rod head 235 and the second part 242 in the second direction; the medium is the same medium and the pressure is consistent, when the push rod 23 moves along the second direction, the force exerted by the medium on the second sealing gasket 25 in the first direction and the sum of the force exerted by the medium on the push rod head 235 and the second part 242 in the second direction can cancel each other out, without the need for an additional balancing structure, further simplifying the overall structure of the solenoid valve 100.
[0053] like Figure 5 As shown, in one embodiment, the core assembly further includes a fixed core 223, and an elastic element 222 is disposed between the movable core 221 and the fixed core 223. When the winding coil 21 is energized to generate a magnetic field, the movable core 221 compresses the elastic element 222 under the drive of the magnetic field and attracts the fixed core 223, thereby driving the push rod 23 to move along the first direction.
[0054] like Figure 5 As shown, in one embodiment, a second sealing ring 27 is mounted on the movable iron core 221. The second sealing ring 27 is at least partially disposed at the relative position of the movable iron core 221 and the fixed iron core 223. The second sealing ring 27 can buffer the collision between the movable iron core 221 and the fixed iron core 223, effectively reducing the noise generated when the two collide, thereby reducing the working noise of the solenoid valve 100.
[0055] like Figure 5 As shown, in one embodiment, the push rod 23 is configured as an integral structure; wherein, the push rod 23 also has a plug-in portion 236, which is inserted into and connected to the movable iron core 221. In this embodiment, the plug-in portion 236 of the push rod 23 and the movable iron core 221 are connected and fixed by an interference fit to ensure the stability of the connection and to ensure that the push rod 23 can move synchronously when the movable iron core 221 moves. It can be understood that in other embodiments, the plug-in portion 236 of the push rod 23 and the movable iron core 221 may also be connected by a thread.
[0056] As can be seen from the above, when the solenoid valve 100 of this application is working, the electromagnetic force generated after the winding coil 21 is energized drives the movable iron core 221 and drives the push rod 23 to move toward the fixed iron core 223 to open the second valve port 15. During this process, the medium introduced from the inlet 11 exerts two forces of opposite direction and equal magnitude on the push rod 23 at the same time. These two forces cancel each other out, so that the medium inside the solenoid valve 100 will not resist the movement of the push rod 23. Based on this force balance design, it is ensured that the electromagnetic force generated by the winding coil 21 on the movable iron core 221 after being energized is greater than the sum of the elastic force of the elastic element 222 elastically restoring and the frictional force between the first sealing ring 26 and the valve body 10. The movable iron core 221 can then drive the push rod 23 to release the blockage of the second valve port 15, thereby realizing the normal opening of the second valve port 15 and ensuring the stable operation of the solenoid valve 100.
[0057] In summary, the working principle of the solenoid valve 100 of this application is as follows: When neither of the two winding coils 21 is energized, both second valve ports 15 on the valve body 10 are blocked by the second sealing gasket 25 on the push rod 23, and both first valve ports 14 are open. At this time, the inlet 11 is connected to the two connecting ports 13 respectively. When both winding coils 21 are energized, the two first valve ports 14 on the valve body 10 are blocked by the first sealing gasket 24 on the push rod 23, and both second valve ports 15 are open. At this time, the outlet 12 is connected to the two connecting ports 13 respectively. When one of the two winding coils 21 is energized and the other is de-energized, the inlet 11 on the valve body 10 is connected to the first connecting port 131 and the outlet 12 is connected to the second connecting port 132, or the inlet 11 is connected to the second connecting port 132 and the outlet 12 is connected to the first connecting port 131. That is, the solenoid valve 100 can realize the switching function of four media flow channels when it is working.
[0058] This application also provides an oxygen concentrator, including the aforementioned solenoid valve 100. Specifically, the oxygen concentrator may be a vehicle-mounted oxygen concentrator.
[0059] When the solenoid valve 100 is applied to a vehicle-mounted oxygen concentrator, its inlet 11 is connected to the air compressor for introducing air; the connecting port 13 is connected to the nitrogen filter; and the outlet 12 is connected to the extraction device for discharging the nitrogen filtered out during the oxygen production process. By controlling the energization or de-energization of the solenoid valve 100, precise control of the oxygen production process can be achieved: when the solenoid valve 100 is de-energized, the first valve port 14 is opened, and the air introduced by the inlet 11 enters the nitrogen filter through the first valve port 14 and the connecting port 13, where the oxygen is collected after filtration; when the solenoid valve 100 is energized, the first valve port 14 is closed, the second valve port 15 is opened, the connecting port 13 is switched to the state of being connected to the outlet 12, and the extraction device extracts the nitrogen stored in the nitrogen filter through the outlet 12.
[0060] Of course, for those skilled in the art, the solenoid valve 100 of this application is not limited to the application scenario of vehicle oxygen generators, but is also applicable to other fields that require multi-channel fluid control, such as industrial fluid control, HVAC systems, etc., and can achieve stable flow channel switching and media control.
[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0062] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.
Claims
1. A solenoid valve, characterized in that, The solenoid valve (100) includes: The valve body (10) has an inlet (11), an outlet (12) and multiple connecting ports (13); wherein the inlet (11) can be connected to multiple connecting ports (13) simultaneously, and the inlet (11) and the outlet (12) are disconnected from each other; the outlet (12) can also be connected to multiple connecting ports (13) simultaneously. Multiple flow control mechanisms (20) are configured one-to-one with multiple communication ports (13). Each flow control mechanism (20) is used to control the corresponding communication port (13) to selectively connect with the inlet (11) or the outlet (12). Each flow control mechanism (20) includes a winding coil (21), an iron core assembly, and a push rod (23). The push rod (23) is inserted into the valve body (10) and connected and fixed to the movable iron core (221) of the iron core assembly. The winding coil (21) is sleeved on the iron core assembly. When the winding coil (21) is energized, it can drive the movable iron core (221) to drive the push rod (23) to move in a first direction, so that the corresponding communication port (13) switches from connecting with the inlet (11) to connecting with the outlet (12). When the push rod (23) moves along the first direction, the first force exerted by the medium introduced by the inlet (11) on the push rod (23) in the second direction opposite to the first direction is equal to the second force exerted by the medium on the push rod (23) in the first direction.
2. The solenoid valve according to claim 1, characterized in that, The valve body (10) also has a first valve port (14) and a second valve port (15) corresponding to the communication port (13). The communication port (13) can communicate with the inlet (11) through the corresponding first valve port (14) and with the outlet (12) through the corresponding second valve port (15). The push rod (23) is provided with a first sealing gasket (24) and a second sealing gasket (25). The push rod (23) can block the first valve port (14) through the first sealing gasket (24) and can block the second valve port (15) through the second sealing gasket (25). The push rod (23) also forms a sliding boss (231). The sliding boss (231) is located on the side of the first sealing gasket (24) facing the movable iron core (221) and is slidably connected to the valve body (10). When the top rod (23) is along the first direction, the first sealing gasket (24) is subjected to the first force of the medium in the second direction; the sliding boss (231) and the second sealing gasket (25) are both subjected to the force of the medium in the first direction, and the sum of the two is equal to the second force.
3. The solenoid valve according to claim 2, characterized in that, The first sealing gasket (24) includes a first part (241) and a second part (242). The second part (242) is disposed on the outer wall of the first part (241) and connected to the first part (241). The first sealing gasket (24) can block the first valve port (14) through the connection between the first part (241) and the second part (242). Wherein, the projected area of the first part (241) in the first direction is equal to the projected area of the sliding boss (231) in the second direction; and the projected area of the second part (242) in the first direction is equal to the area of the portion outside the second valve port (15) when the second sealing gasket (25) blocks the second valve port (15).
4. The solenoid valve according to claim 3, characterized in that, The valve body (10) has a relief groove (101) at the location of the second valve port (15), and the medium introduced by the inlet (11) can enter the relief groove (101) and act on the second sealing gasket (25).
5. The solenoid valve according to claim 2, characterized in that, The top rod (23) has a partition portion (232), a first guide portion (233), and a second guide portion (234) formed thereon. The first guide portion (233) and the second guide portion (234) are disposed on two opposite sides of the partition portion (232). The first guide portion (233) can limit the first sealing gasket (24) to the partition portion (232), and the second guide portion (234) can limit the second sealing gasket (25) to the partition portion (232). The first guide section (233) has a first guide slope (2331), which can guide the medium introduced by the inlet (11) to the corresponding connecting port (13); the second guide section (234) has a second guide slope (2341), which can guide the medium introduced by the connecting port (13) to the outlet (12).
6. The solenoid valve according to claim 1, characterized in that, The core assembly also includes an elastic element (222), which can drive the movable core (221) to move the top rod (23) along the second direction when the winding coil (21) is de-energized, so that the corresponding connection port (13) switches from being connected to the outlet (12) to being connected to the inlet (11); When the push rod (23) moves along the second direction, the third force exerted by the medium introduced through the communication port (13) on the push rod (23) in the second direction is equal to the fourth force exerted by the medium on the push rod (23) in the first direction.
7. The solenoid valve according to claim 6, characterized in that, The valve body (10) also has a second valve port (15) corresponding to the communication port (13), and the communication port (13) can be connected to the outlet (12) through the corresponding second valve port (15); The push rod (23) is provided with a first sealing gasket (24) and a second sealing gasket (25). The push rod (23) can block the second valve port (15) through the second sealing gasket (25). The push rod (23) also forms a push rod head (235). The push rod head (235) is located on the side of the second sealing gasket (25) away from the movable iron core (221) and can be inserted and cooperated with the valve body (10). When the push rod (23) moves along the second direction, the second sealing gasket (25) is subjected to a fourth force of the medium in the first direction; the push rod head (235) and the first sealing gasket (24) are both subjected to the force of the medium in the second direction, and the sum of the two is equal to the third force.
8. The solenoid valve according to claim 1, characterized in that, The number of the connection ports (13) is configured to be two.
9. The solenoid valve according to claim 1, characterized in that, The top rod (23) is configured as an integral structure; The top rod (23) also has a plug-in part (236), which is inserted into the movable iron core (221) and connected to the movable iron core (221).
10. An oxygen generator, characterized in that, The solenoid valve (100) includes any one of claims 1 to 9.