An installation structure for the backflow prevention function of a silent solenoid valve

Abstract

This utility model proposes an installation structure for the backflow prevention function of a silent solenoid valve. The frame body has a first cavity, within which a moving iron core and a stationary iron core are placed, forming a magnetic attraction. The stationary iron core body has a second cavity, within which a backflow prevention valve assembly is installed. This assembly includes an elastic element, a push rod assembly, and a sealing element. One end of the elastic element is connected to the moving iron core, and the other end is sleeved with the push rod assembly. The distal end of the push rod assembly is connected to the sealing element. A valve cap body is located near the sealing element within the stationary iron core body. The valve cap body has a third cavity, with a first air inlet at its distal end. The first cavity is connected to a fourth cavity and an air outlet. By including the valve cap body, the pre-pressure of the elastic element can be adjusted, thus adjusting the sealing degree of the backflow prevention valve assembly. This also reduces the solenoid valve's drive voltage requirement and extends its service life.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve fluid control technology, and more specifically, relates to an installation structure for the backflow prevention function of a silent electromagnetic valve. 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 of controllers 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] In 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. This only serves to reduce the collision between the moving iron core and the stationary iron core when the moving iron core is attracted, thus reducing noise. However, existing technology does not involve creating a cavity within the stationary iron core body, in which a check valve assembly, an elastic element, and a valve cap assembly are placed. One end of the elastic element is connected to the moving iron core, and the other end is connected to the check valve assembly. The valve cap assembly has an air inlet, is connected to the stationary iron core body, and abuts against the check valve assembly. By adjusting the degree of contact between the valve cap assembly and the check valve assembly, the pre-pressure of the elastic element can be adjusted, which can reduce the noise caused by the collision of the moving iron core. At the same time, it can also reduce the driving voltage requirement of the solenoid valve, thereby extending the service life of the solenoid valve. However, existing technology does not include such a technology; it only provides a spring at the end of the iron core facing the moving iron core to provide the moving iron core with restoring power and to seal the air passage. Utility Model Content

[0009] Therefore, in order to solve the above-mentioned technical problems, this utility model proposes an installation structure for the anti-reverse function of a silent solenoid valve, including 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 movably disposed in the first cavity 40 along the axial direction, and 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 form a magnetic attraction engagement. The stationary iron core body 30 has a second cavity 50, and the second cavity 50 is axially disposed within the second cavity. A check valve assembly 60 is movably provided. 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. A valve cap body 230 is provided inside the stationary iron core body 30 near the sealing element 603. The valve cap body 230 is detachably connected to the stationary iron core body 30, and a third cavity is provided inside the valve cap body 230. The third cavity 70 is connected to the second cavity 50. The distal end of the third cavity 70 is provided with a first air inlet 80. The first cavity 40 is respectively connected to a fourth cavity 90 and an air outlet 100. The distal end of the fourth cavity 90 is provided with an air bag inlet 110. The push rod assembly 602 is provided with a throttling channel 120 around its periphery for connecting the third cavity 70 and the second cavity 50. When the valve cap body 230 is connected to the stationary iron core body 30, the valve cap body 230 is in close contact with the input end of the second cavity 50. The sealing surface of the sealing element 603 is in close contact with the output end of the third cavity 70. By adjusting the degree of contact between the valve cap body 230 and the sealing element 603, the pre-pressure of the elastic element 601 can be adjusted, allowing for a larger elastic force tolerance. By providing the valve cap body 230, not only can the pre-pressure of the elastic element 601 be adjusted, indirectly adjusting the sealing degree of the check valve assembly 60, but also the noise from the collision of the moving iron core body 20 can be reduced, and the driving voltage requirement of the solenoid valve can be reduced, thereby extending the service life of the solenoid valve.

[0010] An installation structure for a silent solenoid valve with a check valve 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, and the stationary iron core body 30 and the moving iron core body 20 form a magnetic attraction. The stationary iron core body 30 has a second cavity 50. A check valve assembly 60 is axially movably disposed 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 distal end of the push rod assembly 602 is connected to the sealing element 603. A valve cap body 230 is disposed within the stationary iron core body 30 near the sealing element 603. The valve cap body 230 is detachably connected to the stationary iron core body 30. The valve cap body 230 has a third cavity 70, which is connected to the second cavity 50. The third cavity 70 has a first air inlet 80 at its distal end. The first cavity 40 is connected to a fourth cavity 90 and an air outlet 100. The fourth cavity 90 has an air bag inlet 110 at its distal end. The push rod assembly 602 has a throttling channel 120 around its periphery, which is used to connect the third cavity 70 and the second cavity 50. When the valve cap body 230 is connected to the stationary iron core body 30, the valve cap body 230 is in close contact with the input end of the second cavity 50, and the sealing surface of the sealing element 603 is in close contact with the output end of the third cavity 70. By adjusting the degree of contact between the valve cap body 230 and the sealing element 603, the pre-pressure of the elastic element 601 can be adjusted, allowing for a larger elastic force tolerance.

[0011] Furthermore, the valve cap body 230 and the stationary iron core body 30 are detachably connected in the following way: the valve cap body 230 is provided with an external thread on the outer side of one end near the stationary iron core body 30, and the stationary iron core body 30 is provided with an internal thread on one end near the valve cap body 230. The valve cap body 230 and the stationary iron core body 30 are connected through the external thread and the internal thread.

[0012] Furthermore, the valve cap body 230 and the stationary iron core body 30 are detachably connected in the following way: the end of the valve cap body 230 near the stationary iron core body 30 is an optical axis, and the end of the stationary iron core body 30 near the valve cap body 230 is provided with an optical hole, and the optical axis is sleeved with the optical hole.

[0013] Furthermore, a fixing member 240 is provided on the outer side of the valve cap body 230 near the first air inlet 80. The fixing member 240 is used to help the valve cap body 230 and the stationary iron core body 30 to be connected more stably.

[0014] Furthermore, a second groove 250 is provided at the engagement point between the valve cap body 230 and the fixing member 240, and a second sealing ring 260 matching the second groove 250 is provided. The second groove 250 and the second sealing ring 260 engage, and the outer side of the second sealing ring 260 abuts against the fixing member 240. The second sealing ring 260 is used to assist in a more stable connection between the valve cap body 230 and the fixing member 240, and to prevent airflow leakage.

[0015] 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.

[0016] 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.

[0017] Furthermore, a throttling channel 120 is formed between two adjacent radial protrusions 150. When airflow enters the third cavity 70 from the first air inlet 80, the airflow is evenly dispersed into the second cavity 50 through the throttling channel 120.

[0018] 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 throttling 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Furthermore, both the sealing element 603 and the first sealing member 220 are made of elastic materials.

[0024] The beneficial effects of this utility model are as follows: This utility model proposes an installation structure for the anti-reverse function of a silent solenoid valve, including 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, and the stationary iron core body 30 and the moving iron core body 20 form a magnetic attraction fit. The stationary iron core body 30 has a second cavity 50, which is axially movably disposed within the second cavity 50. A check valve assembly 60 is provided, comprising 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. A valve cap body 230 is provided inside the stationary iron core body 30 near the sealing element 603. The valve cap body 230 is detachably connected to the stationary iron core body 30, and a third cavity is provided inside the valve cap body 230. 70. The third cavity 70 is connected to the second cavity 50. The distal end of the third cavity 70 is provided with a first air inlet 80. The first cavity 40 is respectively connected to a fourth cavity 90 and an air outlet 100. The distal end of the fourth cavity 90 is provided with an air bag inlet 110. The push rod assembly 602 is provided with a throttling channel 120 around its periphery for connecting the third cavity 70 and the second cavity 50. When the valve cap body 230 is connected to the stationary iron core body 30, the valve cap body 230 is in close contact with the input end of the second cavity 50. The sealing surface of the sealing element 603 is in close contact with the output end of the third cavity 70. By adjusting the degree of contact between the valve cap body 230 and the sealing element 603, the pre-pressure of the elastic element 601 can be adjusted, allowing for a larger elastic force tolerance. By providing the valve cap body 230, not only can the pre-pressure of the elastic element 601 be adjusted, indirectly adjusting the sealing degree of the check valve assembly 60, but also the noise from the collision of the moving iron core body 20 can be reduced, and the driving voltage requirement of the solenoid valve can be reduced, thereby extending the service life of the solenoid valve. Attached Figure Description

[0025] Figure 1 This is a front sectional view of the installation structure for the backflow prevention function of a silent solenoid valve according to this utility model.

[0026] Figure 2 This is a partial structural cross-sectional view of the installation structure for the backflow prevention function of a silent solenoid valve according to this utility model.

[0027] Figure 3 This is a schematic diagram of the push rod structure of the installation structure for the backflow prevention function of a silent solenoid valve according to this utility model.

[0028] Figure 4 This is a schematic diagram of the installation structure for the backflow prevention function of a silent solenoid valve according to this utility model.

[0029] Explanation of key component symbols:

[0030] 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, throttling 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, first sealing element 220, valve cap body 230, fixing element 240, second groove 250, and second sealing ring 260.

[0031] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0032] 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.

[0033] 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).

[0034] 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:

[0035] like Figure 1 The image shown is a front sectional view of the mounting structure for the check valve function of a silent solenoid valve according to this utility model; as shown... Figure 2 The image shown is a partial sectional view of the installation structure for the check valve function of a silent solenoid valve according to this utility model; as shown... Figure 3 The diagram shown is a schematic representation of the push rod structure of the anti-reverse function mounting structure of a silent solenoid valve according to this utility model; as shown... Figure 4The diagram shown is a schematic diagram of the installation structure for the backflow prevention function of a silent solenoid valve according to this utility model.

[0036] An installation structure for a silent solenoid valve with a check valve 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, and the stationary iron core body 30 and the moving iron core body 20 form a magnetic attraction. The stationary iron core body 30 has a second cavity 50. A check valve assembly 60 is axially movably disposed 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 distal end of the push rod assembly 602 is connected to the sealing element 603. A valve cap body 230 is disposed within the stationary iron core body 30 near the sealing element 603. The valve cap body 230 is detachably connected to the stationary iron core body 30. The valve cap body 230 has a third cavity 70, which is connected to the second cavity 50. The third cavity 70 has a first air inlet 80 at its distal end. The first cavity 40 is connected to a fourth cavity 90 and an air outlet 100. The fourth cavity 90 has an air bag inlet 110 at its distal end. The push rod assembly 602 has a throttling channel 120 around its periphery, which is used to connect the third cavity 70 and the second cavity 50. When the valve cap body 230 is connected to the stationary iron core body 30, the valve cap body 230 is in close contact with the input end of the second cavity 50, and the sealing surface of the sealing element 603 is in close contact with the output end of the third cavity 70. By adjusting the degree of contact between the valve cap body 230 and the sealing element 603, the pre-pressure of the elastic element 601 can be adjusted, allowing for a larger elastic force tolerance.

[0037] The valve cap body 230 and the stationary iron core body 30 are detachably connected in the following way: the valve cap body 230 is provided with an external thread on the outer side of one end near the stationary iron core body 30, and the stationary iron core body 30 is provided with an internal thread on one end near the valve cap body 230. The valve cap body 230 and the stationary iron core body 30 are connected through the external thread and the internal thread.

[0038] The valve cap body 230 and the stationary iron core body 30 are detachably connected in the following way: the end of the valve cap body 230 near the stationary iron core body 30 is an optical axis, and the end of the stationary iron core body 30 near the valve cap body 230 is provided with an optical hole, and the optical axis is sleeved with the optical hole.

[0039] A fixing member 240 is provided on the outer side of the valve cap body 230 near the first air inlet 80. The fixing member 240 is used to assist the valve cap body 230 and the stationary iron core body 30 to be connected more stably. A second groove 250 is provided at the engagement point between the valve cap body 230 and the fixing member 240, and a second sealing ring 260 matching the second groove 250 is provided. The second groove 250 and the second sealing ring 260 are engaged, and the outer side of the second sealing ring 260 abuts against the fixing member 240. The second sealing ring 260 is used to assist the valve cap body 230 and the fixing member 240 to be connected more stably, and to prevent airflow leakage.

[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. The throttling 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 throttling channel 120.

[0042] 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, 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 into the second cavity 50 from the throttling channel 120, 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Both the sealing element 603 and the first sealing element 220 are made of elastic materials.

[0048] The beneficial effects of this utility model are as follows: This utility model proposes an installation structure for the anti-reverse function of a silent solenoid valve, including 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, and the stationary iron core body 30 and the moving iron core body 20 form a magnetic attraction fit. The stationary iron core body 30 has a second cavity 50, which is axially movably disposed within the second cavity 50. A check valve assembly 60 is provided, comprising 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. A valve cap body 230 is provided inside the stationary iron core body 30 near the sealing element 603. The valve cap body 230 is detachably connected to the stationary iron core body 30, and a third cavity is provided inside the valve cap body 230. 70. The third cavity 70 is connected to the second cavity 50. The distal end of the third cavity 70 is provided with a first air inlet 80. The first cavity 40 is respectively connected to a fourth cavity 90 and an air outlet 100. The distal end of the fourth cavity 90 is provided with an air bag inlet 110. The push rod assembly 602 is provided with a throttling channel 120 around its periphery for connecting the third cavity 70 and the second cavity 50. When the valve cap body 230 is connected to the stationary iron core body 30, the valve cap body 230 is in close contact with the input end of the second cavity 50. The sealing surface of the sealing element 603 is in close contact with the output end of the third cavity 70. By adjusting the degree of contact between the valve cap body 230 and the sealing element 603, the pre-pressure of the elastic element 601 can be adjusted, allowing for a larger elastic force tolerance. By providing the valve cap body 230, not only can the pre-pressure of the elastic element 601 be adjusted, indirectly adjusting the sealing degree of the check valve assembly 60, but also the noise from the collision of the moving iron core body 20 can be reduced, and the driving voltage requirement of the solenoid valve can be reduced, thereby extending the service life of the solenoid valve.

[0049] 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. An installation structure for the backflow prevention function of a silent solenoid valve, comprising a frame body (10), a moving iron core body (20), and a stationary iron core body (30), wherein 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), and the stationary iron core body (30) and the moving iron core body (20) form a magnetic attraction engagement. 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 characteristic feature is that: A valve cap body (230) is provided at one end of the stationary iron core body (30) near the sealing element (603). The valve cap body (230) is detachably connected to the stationary iron core body (30). A third cavity (70) is provided inside the valve cap body (230). The third cavity (70) is connected to the second cavity (50). A first air inlet (80) is provided at the far end of the third cavity (70). A fourth cavity (90) and an air outlet channel (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). The push rod assembly (602) is provided with a throttling channel (120) for connecting the third cavity (70) and the second cavity (50). When the valve cap body (230) is connected to the stationary iron core body (30), the valve cap body (230) is in close contact with the input end of the second cavity (50), and the sealing surface of the sealing element (603) is in close contact with the output end of the third cavity (70). By adjusting the degree of contact between the valve cap body (230) and the sealing element (603), the pre-pressure of the elastic element (601) can be adjusted, allowing for a larger elastic force tolerance.

2. The installation structure for the check function of the silent solenoid valve according to claim 1, characterized in that: The valve cap body (230) and the stationary iron core body (30) are detachably connected in the following manner: the valve cap body (230) has an external thread on the outer side of one end near the stationary iron core body (30), and the stationary iron core body (30) has an internal thread on one end near the valve cap body (230). The valve cap body (230) and the stationary iron core body (30) are connected through the external thread and the internal thread.

3. The installation structure for the check function of the silent solenoid valve according to claim 1, characterized in that: The valve cap body (230) and the stationary iron core body (30) are detachably connected in the following manner: the end of the valve cap body (230) near the stationary iron core body (30) is an optical axis, and the end of the stationary iron core body (30) near the valve cap body (230) is provided with an optical hole, and the optical axis is sleeved with the optical hole.

4. The installation structure for the check function of the silent solenoid valve according to claim 1, characterized in that: The valve cap body (230) is provided with a fixing member (240) on the outer side near the first air inlet (80). The fixing member (240) is used to help the valve cap body (230) and the stationary iron core body (30) to be connected more stably.

5. The installation structure for the check function of the silent solenoid valve according to claim 4, characterized in that: The valve cap body (230) and the fixing member (240) are provided with a second groove (250) and a second sealing ring (260) that matches the second groove (250). The second groove (250) and the second sealing ring (260) are engaged, and the outer side of the second sealing ring (260) abuts against the fixing member (240). The second sealing ring (260) is used to help the valve cap body (230) and the fixing member (240) to connect more stably and to prevent airflow leakage.

6. The installation structure for the check function of the silent solenoid valve according to claim 5, 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).

7. The installation structure for the check function of the silent solenoid valve according to claim 6, characterized in that: The throttling 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 throttling channel (120).

8. The installation structure for the check function of the silent solenoid valve according to claim 7, 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 throttling 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).

9. The installation structure for the check function of the silent solenoid valve according to claim 8, 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.

10. The mounting structure for the check function of the silent solenoid valve according to claim 9, 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.

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