Mute electromagnetic valve with non-return function

Abstract

The mute electromagnetic valve with the non-return function comprises a framework body, a movable iron core body and a static iron core body, the check valve assembly is arranged, air inlet pressure is reduced through an air flow channel, electromagnetic force needed by the movable iron core body is reduced, and then the service life of the electromagnetic valve is prolonged; meanwhile, the internal pressure of the first cavity is always higher than that of the second cavity, so that the impact energy is reduced when the movable iron core body recovers, and the recovery noise is inhibited; the elastic element provides small buffering force when the movable iron core body moves, magnetic attraction force needed when the static iron core body and the movable iron core body are attracted and sealed in a matched mode is reduced, impact energy is reduced during sealing collision, and attraction noise is restrained. The check valve assembly is integrated in the inner cavity of the static iron core body, an external check valve is omitted, and the structure is simplified; and the elastic element simultaneously drives the movable iron core body to block the air outlet flow channel and pushes the check valve assembly to seal the first air inlet, so that a bidirectional effect on an air path is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve fluid control technology, and more specifically, relates to a silent electromagnetic valve with a backflow prevention function. Background Technology

[0002] With the rapid development of new energy, the passenger cabin is relatively quiet. In order to reduce internal noise and improve comfort, some car seats are equipped with pneumatic comfort systems. The pneumatic lumbar support system realizes lumbar support and adjusts lumbar comfort by inflating and deflating air bags. The electromagnetic air valve must simultaneously meet the functions of inflation, pressure holding and deflation.

[0003] With the rapid development of the automotive industry and the expansion of market demand, especially with new energy vehicles becoming increasingly popular, the requirements for the structure of corresponding parts in terms of noise and space design are also getting higher and higher.

[0004] Currently, pneumatic lumbar supports in the industry mainly use solenoid valves in the controller to control the inflation and deflation of the system. The size and height of the valve will affect the arrangement and placement of the control system inside the seat, as well as the noise generated by the collision between the stationary iron core and the moving iron core inside the valve.

[0005] A solenoid valve is a device that operates based on the principle of electromagnetic induction. It is primarily used to control the flow of fluids (such as gases or liquids). It consists of two parts: an electromagnet and a valve body. The electromagnet part includes a coil, a valve core, and the valve body. Its working principle can be summarized as follows: When energized: Current flows through the electromagnetic coil, generating a magnetic field. This magnetic field acts on the valve core, attracting or pushing it open, causing it to move and thus changing the inlet and outlet state of the valve body, achieving fluid flow control or flow regulation. When de-energized: The electromagnetic force disappears, and the valve core resets under the action of the spring force, closing the valve and sealing the air inlet to stabilize the gas flow in the main air passage.

[0006] Solenoid valves play a vital role in automated control systems, enabling automatic control based on signals from sensors, controllers, CAN / LIN communication, and other means. This allows for functions such as automatic fluid switching and flow rate control, thereby improving production efficiency and equipment stability.

[0007] The existing patent authorization announcement number: CN 222316094 U, discloses a silent solenoid valve. In this utility model, a silent solenoid valve includes a skeleton with a cavity. A coil is provided on the outer peripheral wall of the skeleton. A moving iron core and a stationary iron core are coaxially provided in the cavity. A silencing pad is sleeved on the end of the stationary iron core facing the moving iron core. A convex ring is provided on the silencing pad facing the moving iron core. When the moving iron core and the stationary iron core are attracted together, the convex ring abuts and seals with the end face of the moving iron core. By abutting the end face of the convex ring with the end face of the moving iron core, the impact contact area when the moving iron core and the stationary iron core are attracted together is reduced, which can effectively reduce the impact noise generated by the attraction between the moving iron core and the stationary iron core.

[0008] Although in the existing technology, a guide hole is provided at the end of the stationary iron core facing the moving iron core, and an elastic component is installed inside the guide hole, its only functions are to reduce the collision between the moving iron core and the stationary iron core when they are attracted, reduce noise, provide the moving iron core with restoring power, and seal the air passage. However, the existing technology still has the following problems:

[0009] 1. It does not involve bidirectional action on the air passage; it can simultaneously seal the air inlet and outlet to maintain pressure.

[0010] 2. The compression spring force in existing solenoid valves is limited by the spring steel wire and the spring winding process, which often has a large tolerance range, resulting in low product consistency of solenoid valves. The most influential factors are the wire diameter and the outer diameter. The fourth power of the wire diameter is directly proportional to the spring force, while the third power of the outer diameter is inversely proportional to the spring force.

[0011] 3. Existing technology, in order to achieve stable closure of the intake air passage under conditions where the external air supply pressure is greater than 45 kPa, generally requires a high voltage (e.g., 10V or above) for the solenoid valve to generate sufficient electromagnetic force to overcome the spring compression force and the external air pressure. This generates a large amount of heat, increasing energy consumption and significantly shortening the lifespan of the solenoid valve. If only a starting voltage sufficient to close the solenoid valve at normal pressure, such as 5V or lower, is applied, it is insufficient to overcome the thrust generated by the external air pressure, resulting in an incomplete seal at the intake port. This leads to the problem of simultaneous air release and refill, directly impacting user comfort.

[0012] 4. To avoid the effects of high heat and achieve long service life, existing technologies require the selection of solenoid valves with more turns (e.g., 0.15mm wire diameter and more than 1800 turns), resulting in higher costs. Furthermore, the bulky size of the solenoid valves affects the product's design layout, requiring more external space and leading to a larger and heavier fluid control assembly, thus impacting product competitiveness.

[0013] 5. The collision sound that occurs when the moving iron core is attracted and rebounds is still obvious, affecting the user experience. Utility Model Content

[0014] Therefore, in order to solve the above-mentioned technical problems, this utility model proposes a silent solenoid valve with a backflow prevention function, including a skeleton body 10, a moving iron core body 20, and a stationary iron core body 30. The skeleton body 10 has a first cavity 40. The moving iron core body 20 is movably disposed in the first cavity 40 along the axial direction. The stationary iron core body 30 is fixed to the distal end of the first cavity 40. The stationary iron core body 30 and the moving iron core body 20 attract each other after the solenoid valve is energized. The stationary iron core body 30 has a second cavity 50. The second cavity 50 has a backflow prevention valve assembly 60 movably disposed in the second cavity 50 along the axial direction. The backflow prevention valve assembly 60 includes an elastic element 6. 01. A push rod assembly 602 and a sealing element 603 are provided. One end of the elastic element 601 is connected to the moving iron core body 20, and the other end is sleeved with the push rod assembly 602. The sealing element 603 is connected to the distal end of the push rod assembly 602. A third cavity 70 is provided at the connection point of the second cavity 50. A first air inlet 80 is provided at the distal end of the third cavity 70. A fourth cavity 90 and an air outlet 100 are respectively connected to the first cavity 40. An air bag inlet 110 is provided at the distal end of the fourth cavity 90. An airflow channel 120 is provided around the push rod assembly 602 for connecting the third cavity 70 and the second cavity 50. The sealing element 603 is connected to the first cavity 40. Component 603 is used to block and seal the first air inlet 80. By providing the check valve assembly 60 and reducing the air intake pressure through the airflow channel 120, the electromagnetic force required for the moving iron core body 20 is reduced. With the reduced electromagnetic force requirement, the number of turns of the coil 140 or the solenoid valve drive voltage requirement can be reduced, thereby extending the service life of the solenoid valve. At the same time, the internal pressure of the first cavity 40 is always greater than the pressure of the second cavity 50, so the pre-pressure of the elastic element 601 can be reduced, and the impact energy when the moving iron core body 20 returns is reduced, thus suppressing the return noise. The elastic element 601 provides a small buffer force when the moving iron core body 20 moves. The design reduces the magnetic attraction force required when the stationary iron core body 30 and the moving iron core body 20 are attracted and sealed, reduces the impact energy during sealing collisions, and suppresses attraction noise. The integrated check valve design integrates the check valve assembly 60 (push rod assembly 602, sealing element 603, elastic element 601) into the internal cavity (second cavity 50) of the stationary iron core body 30, eliminating the need for an external check valve and simplifying the structure. The elastic element 601 simultaneously drives the moving iron core body 20 to block the air outlet passage 100 and pushes the check valve assembly 60 to seal the first air inlet 80, providing a bidirectional effect on the air path, ensuring that the airflow does not leak, and thus maintaining the pressure of the air bag.

[0015] A silent solenoid valve with a backflow prevention function includes a frame body 10, a moving iron core body 20, and a stationary iron core body 30. The frame body 10 has a first cavity 40. The moving iron core body 20 is axially movably disposed within the first cavity 40. The stationary iron core body 30 is fixed to the distal end of the first cavity 40. The stationary iron core body 30 and the moving iron core body 20 attract each other after the solenoid valve is energized. The stationary iron core body 30 has a second cavity 50. A backflow prevention valve assembly 60 is axially movably disposed within the second cavity 50. The backflow prevention valve assembly 60 includes an elastic element 601, a push rod assembly 602, and a sealing element 603. One end of the sex element 601 is connected to the moving iron core body 20, and the other end is sleeved with the push rod assembly 602. The far end of the push rod assembly 602 is connected to the sealing element 603. The second cavity 50 is connected to a third cavity 70. The far end of the third cavity 70 is provided with a first air inlet 80. The first cavity 40 is connected to a fourth cavity 90 and an air outlet 100. The far end of the fourth cavity 90 is provided with an air bag inlet 110. The push rod assembly 602 is surrounded by an airflow channel 120 for connecting the third cavity 70 and the second cavity 50. The sealing element 603 is used to block and seal the first air inlet 80.

[0016] Furthermore, the top of the skeleton body 10 is provided with a yoke support 130, and a coil 140 is wound on the skeleton body 10. The yoke support 130 is placed above the coil 140, and the skeleton body 10 and the yoke support 130 are detachably connected.

[0017] Furthermore, the push rod assembly 602 includes a push rod body 6021. The push rod body 6021 has a plurality of radially spaced protrusions 150 on its outer circumferential direction. The radial protrusions 150 are symmetrically arranged along the central axis, and each radial protrusion 150 has an outwardly extending support platform 160 at its bottom. After the elastic element 601 is sleeved with the radial protrusion 150, one end of the elastic element 601 abuts against the top surface of the support platform 160, thereby limiting the stroke of the elastic element 601.

[0018] Furthermore, an airflow channel 120 is formed between two adjacent radial protrusions 150. When airflow enters the third cavity 70 from the first air inlet 80, it is evenly dispersed into the second cavity 50 through the airflow channel 120.

[0019] Furthermore, both the second cavity 50 and the third cavity 70 are stepped chambers, and one side of the second cavity 50 is a braking surface 170. The side of the support platform 160 near the braking surface 170 is an inclined surface 180. When the air bag is inflated, the airflow enters the third cavity 70 through the first air inlet 80. Since the pressure of the airflow is greater than the sum of the preload, compression force of the elastic element 601 and the weight of the push rod body 6021 itself, the push rod body 6021 moves towards the moving iron core body 20. When the braking surface 170 abuts against the inclined surface 180, the push rod body 6021 stops moving. At this time, the airflow flows from the airflow channel 120 into the second cavity 50, and then passes through the first cavity 40 and the fourth cavity 90 in sequence, inflating the air bag through the air bag inlet 110.

[0020] Furthermore, the stepped chamber allows the airflow to fill layer by layer, reducing the impact force of the airflow and thus maintaining the smoothness of the flow, while also facilitating the installation of the check valve assembly 60.

[0021] Furthermore, the connection between the push rod body 6021 and the sealing element 603 is either bonding or snap-fit. When the installation method is snap-fit, the push rod body 6021 is provided with a first mounting groove 190, and the first mounting groove 190 is snap-fitted with the sealing element 603.

[0022] Furthermore, the diameter of the radial protrusion 150 on the outer circumferential direction of the push rod body 6021 is smaller than the diameter of the connection between the push rod body 6021 and the sealing element 603, and the diameter of the connection between the sealing element 603 and the sealing element 603 is smaller than the maximum diameter of the second cavity 50. When the braking surface 170 abuts against the inclined surface 180, a gap is left to allow airflow to pass through.

[0023] Furthermore, the outer side of the stationary iron core body 30 is provided with a first groove 200 and a first sealing ring 210 that matches the first groove 200. The first groove 200 is engaged with the first sealing ring 210, and the outer side of the first sealing ring 210 abuts against the first cavity 40. The first sealing ring 210 is used to assist in sealing and prevent airflow leakage.

[0024] Furthermore, the two ends of the moving iron core body 20 are provided with a first sealing element 220. The first sealing element 220 is used to block the inflow or outflow of airflow, and also helps to reduce the noise generated by the collision.

[0025] Furthermore, both the sealing element 603 and the first sealing member 220 are made of elastic materials.

[0026] The beneficial effects of this utility model are as follows: This utility model proposes a silent solenoid valve with a backflow prevention function, including a skeleton body 10, a moving iron core body 20, and a stationary iron core body 30. The skeleton body 10 has a first cavity 40. The moving iron core body 20 is axially movably disposed within the first cavity 40. The stationary iron core body 30 is fixed to the distal end of the first cavity 40. The stationary iron core body 30 and the moving iron core body 20 attract each other after the solenoid valve is energized. The stationary iron core body 30 has a second cavity 50. A backflow prevention valve assembly 60 is axially movably disposed within the second cavity 50. The backflow prevention valve assembly 60 includes an elastic element 601. The push rod assembly 602 and the sealing element 603 are connected as follows: one end of the elastic element 601 is connected to the moving iron core body 20, and the other end is sleeved with the push rod assembly 602; the sealing element 603 is connected to the distal end of the push rod assembly 602; a third cavity 70 is provided at the connection point of the second cavity 50; a first air inlet 80 is provided at the distal end of the third cavity 70; a fourth cavity 90 and an air outlet 100 are respectively connected to the first cavity 40; an air bag inlet 110 is provided at the distal end of the fourth cavity 90; an airflow channel 120 is provided around the push rod assembly 602 for connecting the third cavity 70 and the second cavity 50; and the sealing element... 603 is used to block and seal the first air inlet 80. By providing the check valve assembly 60 and reducing the air intake pressure through the airflow channel 120, the electromagnetic force required for the moving iron core body 20 is reduced. With the reduced electromagnetic force requirement, the number of coil turns 140 or the solenoid valve drive voltage requirement can be reduced, thereby extending the service life of the solenoid valve. Simultaneously, the internal pressure of the first cavity 40 is always greater than the pressure of the second cavity 50, therefore the pre-pressure of the elastic element 601 can be reduced, reducing the impact energy when the moving iron core body 20 returns and suppressing return noise. The elastic element 601 provides a smaller buffer force when the moving iron core body 20 moves. The magnetic attraction force required for the static iron core body 30 and the moving iron core body 20 to be attracted and sealed is reduced, the impact energy during sealing collision is reduced, and the noise of attraction is suppressed; the integrated check valve design: the check valve assembly 60 (push rod assembly 602, sealing element 603, elastic element 601) is integrated into the internal cavity (second cavity 50) of the static iron core body 30, eliminating the need for an external check valve and simplifying the structure; and the elastic element 601 simultaneously drives the moving iron core body 20 to block the air outlet passage 100 and pushes the check valve assembly 60 to seal the first air inlet 80, playing a bidirectional role in the air path, ensuring that the airflow will not leak, thereby maintaining the pressure of the air bag.

[0027] Working principle: In the non-powered state, there are two states: air pump working state and air pump not working state. When the air pump is working, the moving iron core body 20 seals the inlet of the outlet air passage 100 under the pre-pressure of the elastic element 601. The airflow entering through the first air inlet 80 enters the third cavity 70, pushing the check valve assembly 60 to move proximally until it abuts against the inner wall of the second cavity 50. The airflow flows through the airflow channel 120 to the first cavity 40 and the fourth cavity 90, and then exits from the air bag inlet 110. When the air pump is not working, the moving iron core body 20 seals the inlet of the outlet air passage 100 under the pre-pressure of the elastic element 601, while the push rod assembly 602 seals the output end of the third cavity 70, achieving bidirectional action of the air path and maintaining pressure on the air bag. In the powered state, there are two states: air pump working state and air pump not working state. In operation, when the air pump is in operation, the moving iron core body 20 is driven by electromagnetic force to move towards the stationary iron core body 30, releasing the seal on the outlet air passage 100. The gas in the air bag inlet 110 can exit through the outlet air passage 100. The airflow entering through the first inlet 80 enters the third cavity 70 and pushes the check valve assembly 60 to move towards the proximal end until it abuts against the inner wall of the second cavity 50. The airflow circulates back to the third cavity 70 through the airflow channel 120 and then exits from the first inlet 80. When the air pump is not in operation, the moving iron core body 20 is driven by electromagnetic force to move towards the stationary iron core body 30, releasing the seal on the outlet air passage 100. The airflow is discharged through the outlet air passage 100. The push rod assembly 602 maintains the seal on the third cavity 70 under the combined action of the elastic preload of the elastic element 601 and the displacement of the moving iron core. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a silent solenoid valve with anti-reverse function according to the present invention.

[0029] Figure 2 This is a front sectional view of a silent solenoid valve with anti-reverse function according to this utility model.

[0030] Figure 3 This is a partial structural cross-sectional view of a silent solenoid valve with anti-reverse function according to this utility model.

[0031] Figure 4 This is a schematic diagram of the push rod structure of a silent solenoid valve with anti-reverse function according to this utility model.

[0032] Explanation of key component symbols:

[0033] The components include: skeleton body 10, moving iron core body 20, stationary iron core body 30, first cavity 40, second cavity 50, check valve assembly 60, elastic element 601, push rod assembly 602, push rod body 6021, sealing element 603, third cavity 70, first air inlet 80, fourth cavity 90, air outlet 100, air bag inlet 110, airflow channel 120, yoke support 130, coil 140, radial protrusion 150, support platform 160, braking surface 170, inclined surface 180, first mounting groove 190, first groove 200, first sealing ring 210, and first sealing element 220.

[0034] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0035] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0036] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0037] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections. Example 1:

[0038] like Figure 1 The diagram shown is a structural schematic of a silent solenoid valve with a backflow prevention function according to this utility model; Figure 2 The image shown is a front sectional view of a silent solenoid valve with a backflow prevention function according to this utility model; as shown... Figure 3 The image shown is a partial structural cross-sectional view of a silent solenoid valve with a backflow prevention function according to this utility model; as shown... Figure 4 The diagram shown is a schematic representation of the push rod of a silent solenoid valve with anti-reverse function according to this utility model.

[0039] A silent solenoid valve with a backflow prevention function includes a frame body 10, a moving iron core body 20, and a stationary iron core body 30. The frame body 10 has a first cavity 40. The moving iron core body 20 is axially movably disposed within the first cavity 40. The stationary iron core body 30 is fixed to the distal end of the first cavity 40. The stationary iron core body 30 and the moving iron core body 20 attract each other after the solenoid valve is energized. The stationary iron core body 30 has a second cavity 50. A backflow prevention valve assembly 60 is axially movably disposed within the second cavity 50. The backflow prevention valve assembly 60 includes an elastic element 601, a push rod assembly 602, and a sealing element 603. One end of the sex element 601 is connected to the moving iron core body 20, and the other end is sleeved with the push rod assembly 602. The far end of the push rod assembly 602 is connected to the sealing element 603. The second cavity 50 is connected to a third cavity 70. The far end of the third cavity 70 is provided with a first air inlet 80. The first cavity 40 is connected to a fourth cavity 90 and an air outlet 100. The far end of the fourth cavity 90 is provided with an air bag inlet 110. The push rod assembly 602 is surrounded by an airflow channel 120 for connecting the third cavity 70 and the second cavity 50. The sealing element 603 is used to block and seal the first air inlet 80.

[0040] The top of the skeleton body 10 is provided with a yoke support 130, and a coil 140 is wound on the skeleton body 10. The yoke support 130 is placed above the coil 140, and the skeleton body 10 and the yoke support 130 are detachably connected.

[0041] The push rod assembly 602 includes a push rod body 6021. The push rod body 6021 has a plurality of radially spaced protrusions 150 on its outer circumferential side. The radial protrusions 150 are symmetrically arranged along the central axis, and each radial protrusion 150 has an outwardly extending support platform 160 at its bottom. After the elastic element 601 is sleeved with the radial protrusion 150, one end of the elastic element 601 abuts against the top surface of the support platform 160, thereby limiting the stroke of the elastic element 601.

[0042] The airflow channel 120 is formed between two adjacent radial protrusions 150. When the airflow enters the third cavity 70 from the first air inlet 80, the airflow is evenly dispersed into the second cavity 50 through the airflow channel 120.

[0043] Both the second cavity 50 and the third cavity 70 are stepped chambers, and one side of the second cavity 50 is a braking surface 170. The side of the support platform 160 near the braking surface 170 is an inclined surface 180. When the air bag is inflated, the airflow enters the third cavity 70 through the first air inlet 80. Because the pressure of the airflow is greater than the sum of the preload, compression force of the elastic element 601 and the weight of the push rod body 6021, the push rod body 6021 moves towards the... When the moving iron core body 20 moves, and the braking surface 170 abuts against the inclined surface 180, the push rod body 6021 stops moving. At this time, the airflow flows from the airflow channel 120 into the second cavity 50, and then passes through the first cavity 40 and the fourth cavity 90 in sequence. The air bag is inflated through the air bag inlet 110. The stepped chamber allows the airflow to fill layer by layer, reducing the impact force of the airflow and thus maintaining the stability of the flow. It also facilitates the installation of the check valve assembly 60.

[0044] The push rod body 6021 and the sealing element 603 are connected by either bonding or snap-fitting. When the installation method is snap-fitting, the push rod body 6021 is provided with a first mounting groove 190, and the first mounting groove 190 is snap-fitted with the sealing element 603.

[0045] The diameter of the radial protrusion 150 on the outer circumferential direction of the push rod body 6021 is smaller than the diameter of the connection between the push rod body 6021 and the sealing element 603. The diameter of the connection between the sealing element 603 and the sealing element 603 is smaller than the maximum diameter of the second cavity 50. When the braking surface 170 abuts against the inclined surface 180, a gap is left to allow airflow to pass through.

[0046] The outer side of the static iron core body 30 is provided with a first groove 200 and a first sealing ring 210 that matches the first groove 200. The first groove 200 and the first sealing ring 210 are engaged, and the outer side of the first sealing ring 210 abuts against the first cavity 40. The first sealing ring 210 is used to assist in sealing and prevent air leakage.

[0047] The moving iron core body 20 is provided with a first sealing element 220 at both ends. The first sealing element 220 is used to block the inflow or outflow of airflow, and also helps to reduce the noise generated by the collision.

[0048] Both the sealing element 603 and the first sealing element 220 are made of elastic materials.

[0049] The beneficial effects of this utility model are as follows: This utility model proposes a silent solenoid valve with a backflow prevention function, including a skeleton body 10, a moving iron core body 20, and a stationary iron core body 30. The skeleton body 10 has a first cavity 40. The moving iron core body 20 is axially movably disposed within the first cavity 40. The stationary iron core body 30 is fixed to the distal end of the first cavity 40. The stationary iron core body 30 and the moving iron core body 20 attract each other after the solenoid valve is energized. The stationary iron core body 30 has a second cavity 50. A backflow prevention valve assembly 60 is axially movably disposed within the second cavity 50. The backflow prevention valve assembly 60 includes an elastic element 601. The push rod assembly 602 and the sealing element 603 are connected as follows: one end of the elastic element 601 is connected to the moving iron core body 20, and the other end is sleeved with the push rod assembly 602; the sealing element 603 is connected to the distal end of the push rod assembly 602; a third cavity 70 is provided at the connection point of the second cavity 50; a first air inlet 80 is provided at the distal end of the third cavity 70; a fourth cavity 90 and an air outlet 100 are respectively connected to the first cavity 40; an air bag inlet 110 is provided at the distal end of the fourth cavity 90; an airflow channel 120 is provided around the push rod assembly 602 for connecting the third cavity 70 and the second cavity 50; and the sealing element... 603 is used to block and seal the first air inlet 80. By providing the check valve assembly 60 and reducing the air intake pressure through the airflow channel 120, the electromagnetic force required for the moving iron core body 20 is reduced. With the reduced electromagnetic force requirement, the number of coil turns 140 or the solenoid valve drive voltage requirement can be reduced, thereby extending the service life of the solenoid valve. Simultaneously, the internal pressure of the first cavity 40 is always greater than the pressure of the second cavity 50, therefore the pre-pressure of the elastic element 601 can be reduced, reducing the impact energy when the moving iron core body 20 returns and suppressing return noise. The elastic element 601 provides a smaller buffer force when the moving iron core body 20 moves. The magnetic attraction force required for the static iron core body 30 and the moving iron core body 20 to be attracted and sealed is reduced, the impact energy during sealing collision is reduced, and the noise of attraction is suppressed; the integrated check valve design: the check valve assembly 60 (push rod assembly 602, sealing element 603, elastic element 601) is integrated into the internal cavity (second cavity 50) of the static iron core body 30, eliminating the need for an external check valve and simplifying the structure; and the elastic element 601 simultaneously drives the moving iron core body 20 to block the air outlet passage 100 and pushes the check valve assembly 60 to seal the first air inlet 80, playing a bidirectional role in the air path, ensuring that the airflow will not leak, thereby maintaining the pressure of the air bag.

[0050] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A silent solenoid valve with a backflow prevention function, comprising a skeleton body (10), a moving iron core body (20), and a stationary iron core body (30), wherein the skeleton body (10) has a first cavity (40), the moving iron core body (20) is axially movably disposed within the first cavity (40), the stationary iron core body (30) is fixed to the distal end of the first cavity (40), and the stationary iron core body (30) and the moving iron core body (20) attract each other after the solenoid valve is energized, characterized in that: The stationary iron core body (30) is provided with a second cavity (50), and a check valve assembly (60) is movably provided axially within the second cavity (50). The check valve assembly (60) includes an elastic element (601), a push rod assembly (602), and a sealing element (603). One end of the elastic element (601) is connected to the moving iron core body (20), and the other end is sleeved with the push rod assembly (602). The sealing element (603) is connected to the distal end of the push rod assembly (602). The second cavity (50) is provided with a second cavity (50). 0) A third cavity (70) is provided at the connection point. A first air inlet (80) is provided at the far end of the third cavity (70). A fourth cavity (90) and an air outlet (100) are respectively connected to the first cavity (40). An air bag inlet (110) is provided at the far end of the fourth cavity (90). An air flow channel (120) is provided around the push rod assembly (602) for connecting the third cavity (70) and the second cavity (50). The sealing element (603) is used to block and seal the first air inlet (80).

2. The silent solenoid valve with anti-reverse function according to claim 1, characterized in that: The top of the skeleton body (10) is provided with a yoke support (130), and a coil (140) is wound on the skeleton body (10). The yoke support (130) is placed above the coil (140), and the skeleton body (10) and the yoke support (130) are detachably connected.

3. The silent solenoid valve with anti-reverse function according to claim 1, characterized in that: The push rod assembly (602) includes a push rod body (6021). The push rod body (6021) has a plurality of radially spaced protrusions (150) on its outer circumferential side. The radial protrusions (150) are symmetrically arranged along the central axis, and each radial protrusion (150) has an outwardly extending support platform (160) at its bottom. After the elastic element (601) is sleeved with the radial protrusion (150), one end of the elastic element (601) abuts against the top surface of the support platform (160), thereby limiting the stroke of the elastic element (601).

4. The silent solenoid valve with anti-reverse function according to claim 3, characterized in that: The airflow channel (120) is formed between two adjacent radial protrusions (150). When the airflow enters the third cavity (70) from the first air inlet (80), the airflow is evenly dispersed into the second cavity (50) through the airflow channel (120).

5. The silent solenoid valve with anti-reverse function according to claim 1, characterized in that: Both the second cavity (50) and the third cavity (70) are stepped chambers, and one side of the second cavity (50) is a braking surface (170). The side of the support platform (160) near the braking surface (170) is an inclined surface (180). When the air bag is inflated, the airflow enters the third cavity (70) through the first air inlet (80). Since the pressure of the airflow is greater than the preload, compression force and push rod body of the elastic element (601), the pressure of the airflow is greater than the preload, compression force and push rod body of the elastic element (601). The sum of the weight of the push rod body (6021) causes the push rod body (6021) to move toward the moving iron core body (20). When the braking surface (170) abuts against the inclined surface (180), the push rod body (6021) stops moving. At this time, the airflow flows from the airflow channel (120) into the second cavity (50), and then passes through the first cavity (40) and the fourth cavity (90) in sequence, and inflates the air bag through the air bag inlet (110).

6. The silent solenoid valve with anti-reverse function according to claim 5, characterized in that: The connection between the push rod body (6021) and the sealing element (603) is either adhesive or snap-fit. When the installation method is snap-fit, the push rod body (6021) is provided with a first mounting groove (190), and the first mounting groove (190) is snap-fitted with the sealing element (603).

7. The silent solenoid valve with anti-reverse function according to claim 5, characterized in that: The diameter of the radial protrusion (150) on the outer circumferential direction of the push rod body (6021) is smaller than the diameter of the connection between the push rod body (6021) and the sealing element (603). The diameter of the connection between the sealing element (603) and the sealing element (603) is smaller than the maximum diameter of the second cavity (50). When the braking surface (170) abuts against the inclined surface (180), a gap is left to allow airflow to pass through.

8. The silent solenoid valve with anti-reverse function according to claim 1, characterized in that: The outer side of the static iron core body (30) is provided with a first groove (200) and a first sealing ring (210) that matches the first groove (200). The first groove (200) is engaged with the first sealing ring (210), and the outer side of the first sealing ring (210) abuts against the first cavity (40). The first sealing ring (210) is used to assist in sealing and prevent air leakage.

9. The silent solenoid valve with anti-reverse function according to claim 1, characterized in that: The moving iron core body (20) is provided with a first sealing element (220) at both ends. The first sealing element (220) is used to block the inflow or outflow of airflow and also helps to reduce the noise generated by the collision.

10. The silent solenoid valve with anti-reverse function according to claim 1, characterized in that: Both the sealing element (603) and the first sealing element (220) are made of elastic materials.

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