Silent solenoid valve

Abstract

The application provides a mute electromagnetic valve, which comprises a lower valve body, an upper valve body, a valve core, a sleeve, a fixed iron core, a movable iron core and a spring; the lower valve body is provided with a mounting cavity, the valve core is assembled in the mounting cavity, and the upper valve body is assembled at the opening of the mounting cavity and is circumferentially sealed with the lower valve body; the upper end and the lower end of the sleeve are fixed with the fixed iron core and the upper valve body respectively, the movable iron core is located at the inner side of the sleeve and can vertically move relative to the sleeve, the spring is embedded between the fixed iron core and the movable iron core, the lower end of the fixed iron core is coaxially embedded with a magnetic ring, the upper end of the movable iron core is embedded with a flexible buffer, the upper end of the flexible buffer protrudes out of the upper end of the movable iron core, and the lower end of the movable iron core is embedded with a flexible sealing piece; through the arrangement of the flexible buffer, the flexible buffer can effectively absorb the impact energy of the movable iron core and the fixed iron core when the electromagnetic valve is opened, and the high-frequency sharp noise generated by the hard contact impact can be eliminated.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, and more specifically, to a silent solenoid valve. Background Technology

[0002] With the rapid development of the refrigeration and commercial fluid control industry, the requirements for the operational reliability, assembly precision and noise reduction performance of commercial large-diameter solenoid valves are becoming increasingly stringent. As a result, the difficulty in standardizing the overall assembly process, ensuring the stability of structural connections and controlling operating noise during valve body structure design and assembly has also increased significantly.

[0003] Currently, the core structures of commercial large-diameter solenoid valves are mainly divided into two types: traditional welded assembly type and rigid iron core suction type. Traditional welded assembly type solenoid valves use a ring-shaped press-fit between the fixed iron core and the sleeve. The rigidity of the press-fit connection is not as strong as welding, and under extreme conditions of ultra-high pressure and strong impact, loosening may occur, making it unsuitable for ultra-high pressure and large-diameter scenarios. Furthermore, multiple grooves need to be machined on the fixed iron core, increasing manufacturing costs. If impurities, burrs, or press-fit deviations exist on the press-fit surface, fluid leakage is likely to occur, requiring high precision and cleanliness of the parts' surface processing. The sleeve and upper valve body are welded, requiring precise positioning of the coaxiality of the upper valve body and sleeve before welding. If the positioning is incorrect, it will lead to misalignment after welding, increasing processing difficulty and labor costs. Rigid iron core suction type solenoid valves lack a buffer structure between the moving and stationary iron cores, resulting in a rigid collision during suction, which easily generates significant vibration and operating noise. They are only suitable for ordinary operating conditions where noise levels are not strictly required.

[0004] The aforementioned conventional large-diameter solenoid valves all have obvious structural defects: First, the connection between the stationary iron core and the sleeve is a ring-shaped press-fit, which is not suitable for high-pressure, large-diameter, and impact environments. The stationary iron core may become loose, and the cost is high. Second, the iron core has no flexible buffer design when it is engaged, resulting in high operating noise and easy to accelerate component wear. Third, the valve body and sleeve in the existing solenoid valves lack a limiting structure, which can easily cause the coaxiality of the components to deviate and become eccentric, resulting in assembly positioning errors. This leads to a decrease in overall assembly consistency and a high rate of assembly defects. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a silent solenoid valve, which, through the setting of a flexible buffer, can effectively absorb the impact energy of the collision between the moving iron core and the stationary iron core when the solenoid valve is opened, and eliminate the high-frequency sharp noise generated by hard contact impact.

[0006] This invention provides a silent solenoid valve, comprising a lower valve body, an upper valve body, a valve core, a sleeve, a fixed iron core, a moving iron core, and a spring. The lower valve body has a mounting cavity, in which the valve core is assembled. The upper valve body is assembled at the opening of the mounting cavity and is circumferentially sealed to the lower valve body. The upper and lower ends of the sleeve are fixed to the fixed iron core and the upper valve body, respectively. The moving iron core is located inside the sleeve and can move vertically relative to the sleeve. The spring is embedded between the fixed iron core and the moving iron core. A magnetic ring is coaxially embedded at the lower end of the fixed iron core. A flexible buffer is embedded at the upper end of the moving iron core, with the upper end of the flexible buffer protruding beyond the upper end of the moving iron core. A flexible sealing element is embedded at the lower end of the moving iron core. When the moving iron core moves upward, the flexible buffer abuts against the fixed iron core, and the flexible sealing element releases its contact with the valve core, thus opening the solenoid valve. When the moving iron core moves downward, the flexible sealing element abuts against the valve core, thus closing the solenoid valve.

[0007] By employing the above-described structure, this invention allows the flexible buffer to abut against the fixed iron core when the fixed iron core applies a magnetic attraction force to the moving iron core, causing the moving iron core to move upward relative to the sleeve. Simultaneously, the flexible sealing element releases its contact with the valve core, allowing the solenoid valve to open. During this process, the flexible buffer effectively absorbs the impact energy from the collision between the moving and fixed iron cores, isolating the metal surfaces of the moving and fixed iron cores from direct rigid collision. This significantly suppresses impact vibration and eliminates high-frequency sharp noise generated by hard contact impact, thus optimizing the acoustic performance of the solenoid valve during operation.

[0008] In one possible implementation, the flexible buffer is a ring structure, with an annular cavity coaxially provided at the upper end of the moving iron core, and the lower end of the flexible buffer is embedded in the annular cavity. By adopting this structure, the flexible buffer can be reliably fixed to the upper end of the moving iron core by the action of the lower end of the flexible buffer being fitted and fixed in the annular cavity.

[0009] In one possible implementation, a first inverted ring is provided on the inner wall of the annular cavity, and a flange in the shape of an annular ring is provided on the outer wall of the lower end of the flexible buffer. The flange is embedded in the first inverted ring, and the shape of the flange is adapted to the shape of the first inverted ring. By adopting this structure, under the action of the flange and the first inverted ring being embedded in each other, the lower end of the flexible buffer can be effectively prevented from detaching from the moving iron core, that is, the fixed firmness of the flexible buffer and the moving iron core can be guaranteed.

[0010] In one possible implementation, a groove is provided in the middle of the lower end of the moving iron core, and a flexible seal is embedded in the groove. The inner peripheral wall of the groove forms a second inverted ring, and the outer contour shape of the flexible seal is adapted to the second inverted ring. After the flexible seal is embedded in the groove, the flexible seal can be reliably fixed to the lower end of the moving iron core. Furthermore, under the cooperation of the flexible seal and the second inverted ring, the situation of the flexible seal detaching from the moving iron core can be further avoided, that is, the firmness of the fixation between the flexible seal and the moving iron core can be guaranteed.

[0011] In one possible implementation, the upper valve body forms an annular structure, and a first annular step is provided on the inner wall of the upper end of the upper valve body. The lower end of the sleeve is coaxially inserted into the first annular step and abuts against the first annular step. The lower end of the sleeve is welded and fixed to the upper valve body. By adopting this structure, since the lower end of the sleeve is coaxially inserted into the first annular step and abuts against the first annular step, radial limiting of the sleeve and the upper valve body can be achieved when the sleeve and the upper valve body are assembled, that is, the coaxiality of the sleeve and the upper valve body can be guaranteed. This provides a reliable structural reference for the subsequent welding process of the sleeve and the upper valve body, effectively improving the assembly accuracy and welding quality of the solenoid valve.

[0012] In one possible implementation, a second annular step is provided on the outer wall of the lower end of the fixed iron core. The upper end of the sleeve is inserted into and abuts against the second annular step, and the upper end of the sleeve is welded and fixed to the fixed iron core. By adopting this structure, since the upper end of the sleeve is inserted into and abuts against the second annular step, radial positioning of the fixed iron core and sleeve can be achieved during assembly, ensuring the coaxiality of the fixed iron core and sleeve. This provides a reliable structural reference for subsequent welding processes of the fixed iron core and sleeve, effectively improving the performance of the solenoid valve. In addition to ensuring the assembly precision and welding quality, a special groove structure is opened on the side wall of the fixed iron core, or a threaded mounting hole is machined on the upper end face of the fixed iron core for positioning, installation and fixing of the coil frame and coil assembly. When the working current is applied to the coil assembly, an alternating induced magnetic field is generated inside the coil assembly and an effective electromagnetic attraction field is formed. Under the action of electromagnetic attraction, the moving iron core moves axially upward along the cavity inside the sleeve. At this time, the flexible buffer abuts against the fixed iron core, and the flexible seal releases its contact with the valve core to open the solenoid valve.

[0013] In one possible implementation, the inner side of the moving iron core is coaxially provided with a slot with an open top. The lower part of the spring is inserted into the slot, and the lower end of the spring abuts against the inner bottom of the slot, while the upper end of the spring abuts against the upper end of the fixed iron core. By adopting this structure, the spring can be radially limited by the interlocking action of the spring and the slot, thus preventing radial displacement of the spring and ensuring that the spring reliably applies elastic force to the moving iron core.

[0014] In one possible implementation, an annular boss is coaxially provided at the lower end of the upper valve body. The annular boss is threaded to the inside of the mounting cavity to fasten the upper valve body and the lower valve body. A sealing ring is embedded on the outer wall of the annular boss to seal the gap between the annular boss and the mounting cavity. With this structure, the upper valve body and the lower valve body can be reliably threaded together, which has the advantage of convenient assembly of the upper and lower valve bodies. In addition, under the action of the sealing ring, the sealing ring can reliably seal the gap between the annular boss and the mounting cavity.

[0015] In one possible implementation, the valve core includes a diaphragm assembly and a flexible sealing ring. The lower end of the diaphragm assembly has a coaxially arranged annular groove, and the flexible sealing ring is embedded within the annular groove. The inner circumferential wall of the annular groove forms a third inverted ring, and the outer contour of the flexible sealing ring is adapted to the third inverted ring. When the moving iron core moves downward, the middle part of the upper end of the diaphragm assembly is tightly sealed against the flexible seal, and the lower end of the flexible sealing ring is tightly sealed against one end of the fluid outlet located at the bottom of the mounting cavity. By using this valve core, when the moving iron core moves downward, the middle part of the upper end of the diaphragm assembly can be tightly sealed against the flexible seal, and the lower end of the flexible sealing ring... It can tightly seal against the fluid outlet at the bottom of the mounting cavity, thereby reliably cutting off the fluid flow path and keeping the solenoid valve closed. Furthermore, the cooperation between the flexible sealing ring and the third snap-fit ​​effectively prevents the flexible sealing ring from detaching from the diaphragm assembly, ensuring the secure fixation of the flexible sealing ring to the diaphragm assembly. Moreover, the aforementioned flexible sealing ring is formed in an annular groove from rubber material through a vulcanization process, thus offering advantages such as high reliability and ease of fixation between the flexible sealing ring and the diaphragm assembly. The aforementioned diaphragm assembly is existing technology and will not be described in detail here.

[0016] In one possible implementation, the valve core further includes a porous throttling ring, which includes an annular base plate and a plurality of through holes circumferentially spaced on the annular base plate. The porous throttling ring is located below the diaphragm assembly and is vertically opposite to the fluid inlet located at the bottom of the mounting cavity. A third annular step is provided on the inner wall of the mounting cavity, and the outer edge of the porous throttling ring is supported on the third annular step. Through the arrangement of the porous throttling ring, the plurality of circumferentially spaced through holes on the porous throttling ring can achieve uniform flow of fluid, that is, make the flow of fluid smoother, thereby reducing the flow disturbance of fluid. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 for Figure 2 A magnified structural diagram of point A in the middle; Figure 4 for Figure 2 A magnified structural diagram of section B. Detailed Implementation

[0018] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0019] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0020] In the embodiments of 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 is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply 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 that the first feature is at a lower horizontal level than the second feature.

[0021] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] See Figures 1-4 As shown in the figure, this application discloses a silent solenoid valve, including a lower valve body 1, an upper valve body 2, a valve core 3, a sleeve 4, a fixed iron core 5, a moving iron core 6, and a spring 7. The lower valve body 1 has a mounting cavity 11, the valve core 3 is assembled in the mounting cavity 11, and the upper valve body 2 is assembled at the opening of the mounting cavity 11 and circumferentially sealed to the lower valve body 1. The upper and lower ends of the sleeve 4 are fixed to the fixed iron core 5 and the upper valve body 2, respectively. The moving iron core 6 is located inside the sleeve 4 and can move vertically relative to the sleeve 4. The spring 7 is embedded in the fixed iron core. Between the fixed iron core 5 and the moving iron core 6, a magnetic ring 51 is coaxially embedded at the lower end of the fixed iron core 5; a flexible buffer 8 is embedded at the upper end of the moving iron core 6, the upper end of the flexible buffer 8 protruding beyond the upper end of the moving iron core 6, and a flexible sealing element 9 is embedded at the lower end of the moving iron core 6; when the moving iron core 6 moves upward, the flexible buffer 8 abuts against the fixed iron core 5, and the flexible sealing element 9 releases its contact with the valve core 3 to open the solenoid valve; when the moving iron core 6 moves downward, the flexible sealing element 9 abuts against the valve core 3 to close the solenoid valve.

[0023] The flexible buffer 8 has a ring structure. The upper end of the moving iron core 6 is coaxially provided with an annular cavity 61, and the lower end of the flexible buffer 8 is embedded in the annular cavity 61. By adopting this structure, the flexible buffer can be reliably fixed to the upper end of the moving iron core by the action of the lower end of the flexible buffer being fitted and fixed in the annular cavity.

[0024] An annular cavity 61 has a first inverted buckle 611 in the shape of an annular ring on its inner wall, and an annular flange 81 in the shape of an annular ring on the outer wall of the lower end of the flexible buffer 8. The flange 81 is embedded in the first inverted buckle 611, and the shape of the flange 81 matches the shape of the first inverted buckle 611. With this structure, the lower end of the flexible buffer can be effectively prevented from detaching from the moving iron core under the action of the flange and the first inverted buckle, thus ensuring the firmness of the flexible buffer and the moving iron core. In addition, the flexible buffer is formed on the upper end of the moving iron core by vulcanizing rubber material, thus having the advantages of high reliability and convenient fixation of the flexible buffer and the moving iron core.

[0025] A groove 62 is provided in the middle of the lower end of the moving iron core 6. The flexible seal 9 is embedded in the groove 62. The inner peripheral wall of the groove 62 forms a second inverted buckle 621 in the shape of an annulus. The outer contour shape of the flexible seal 9 is adapted to the second inverted buckle 621. After the flexible seal is embedded in the groove, the flexible seal can be reliably fixed to the lower end of the moving iron core. Under the cooperation of the flexible seal and the second inverted buckle, the flexible seal can be further prevented from detaching from the moving iron core, that is, the fixed firmness between the flexible seal and the moving iron core can be guaranteed. In addition, the above-mentioned flexible seal is formed on the lower end of the moving iron core by a rubber material through a vulcanization process, thus having the advantages of high reliability and convenient fixation between the flexible seal and the moving iron core.

[0026] The upper valve body 2 forms an annular structure, and a first annular step 21 is provided on the inner wall of the upper end of the upper valve body 2. The lower end of the sleeve 4 is coaxially inserted into the first annular step 21 and abuts against the first annular step 21. The lower end of the sleeve 4 is welded and fixed to the upper valve body 2. By adopting this structure, since the lower end of the sleeve is coaxially inserted into the first annular step and abuts against the first annular step, radial positioning of the sleeve and the upper valve body can be achieved when the sleeve and the upper valve body are assembled, that is, the coaxiality of the sleeve and the upper valve body can be guaranteed. This provides a reliable structural reference for the subsequent welding process of the sleeve and the upper valve body, effectively improving the assembly accuracy and welding quality of the solenoid valve.

[0027] A second annular step 52 is provided on the outer wall of the lower end of the fixed iron core 5. The upper end of the sleeve 4 is inserted into and abuts against the second annular step 52. The upper end of the sleeve 4 is welded and fixed to the fixed iron core 5. With this structure, since the upper end of the sleeve is inserted into and abuts against the second annular step, radial limiting of the fixed iron core and the sleeve can be achieved when assembling the upper ends of the fixed iron core and the sleeve. That is, the coaxiality of the fixed iron core and the sleeve can be guaranteed, thus providing a reliable structural reference for the subsequent welding process of the fixed iron core and the sleeve, effectively improving the solenoid valve. In addition to ensuring assembly precision and welding quality, a special groove structure is opened on the side wall of the fixed iron core, or a threaded mounting hole is machined on the upper end face of the fixed iron core for positioning, installation and fixing of the coil frame and coil assembly. When the working current is applied to the coil assembly, an alternating induced magnetic field is generated inside the coil assembly and an effective electromagnetic attraction field is formed. Under the action of electromagnetic attraction, the moving iron core moves axially upward along the cavity inside the sleeve. At this time, the flexible buffer abuts against the fixed iron core, and the flexible seal releases its contact with the valve core to open the solenoid valve.

[0028] The inner side of the moving iron core 6 is coaxially provided with a slot 63 with an open upper end. The lower part of the spring 7 is inserted into the slot 63, and the lower end of the spring 7 abuts against the inner bottom of the slot 63, while the upper end of the spring 7 abuts against the upper end of the fixed iron core 5. By adopting this structure, the spring can be radially limited by the cooperation between the spring and the slot, thus avoiding radial displacement of the spring and ensuring that the spring reliably applies elastic force to the moving iron core.

[0029] An annular boss 22 is coaxially provided at the lower end of the upper valve body 2. The annular boss 22 is threaded to the inner side of the mounting cavity 11 to fasten the upper valve body 2 and the lower valve body 1. A sealing ring 23 is embedded on the outer wall of the annular boss 22. The sealing ring 23 is used to seal the gap between the annular boss 22 and the mounting cavity 11. With this structure, the upper valve body can be reliably threaded together with the lower valve body, which has the advantage of convenient assembly of the upper and lower valve bodies. In addition, under the action of the sealing ring, the sealing ring can reliably seal the gap between the annular boss and the mounting cavity.

[0030] The valve core 3 includes a diaphragm assembly 31 and a flexible sealing ring 30. An annular groove 311 is coaxially provided at the lower end of the diaphragm assembly 31. The flexible sealing ring 30 is embedded in the annular groove 311. The inner circumferential wall of the annular groove 311 forms a ring-shaped third inverted buckle 312. The outer contour shape of the flexible sealing ring 30 is adapted to the third inverted buckle 312. When the moving iron core 6 moves downward, the middle part of the upper end of the diaphragm assembly 31 is tightly sealed against the flexible sealing element 9, and the lower end of the flexible sealing ring 30 is tightly sealed against one end of the fluid outlet 12 located at the bottom of the mounting cavity 11. By adopting this valve core, when the moving iron core moves downward, the middle part of the upper end of the diaphragm assembly can tightly seal against the flexible sealing element. The flexible sealing ring has a tight seal at its lower end against the fluid outlet at the bottom of the mounting cavity, ensuring reliable fluid flow by the valve core and keeping the solenoid valve closed. Furthermore, the combination of the flexible sealing ring and the third snap-fit ​​effectively prevents the flexible sealing ring from detaching from the diaphragm assembly, guaranteeing a secure fixation between the flexible sealing ring and the diaphragm assembly. The flexible sealing ring is formed in an annular groove from rubber material through a vulcanization process, offering advantages such as high reliability and ease of fixation. The diaphragm assembly is existing technology and will not be described in detail here.

[0031] The valve core 3 also includes a porous throttling ring 32, which includes an annular base plate 321 and a plurality of through holes 322 arranged circumferentially on the annular base plate 321. The porous throttling ring 32 is located below the diaphragm assembly 31 and is vertically opposite to the fluid inlet 13 located at the bottom of the mounting cavity 11. A third annular step 14 is provided on the inner wall of the mounting cavity 11, and the outer edge of the porous throttling ring 32 is supported on the third annular step 14. Through the arrangement of the porous throttling ring, the plurality of circumferentially spaced through holes on the porous throttling ring can achieve uniform flow of fluid, that is, make the flow of fluid smoother, thereby reducing the flow disturbance of fluid.

[0032] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A silent solenoid valve, characterized in that: The system includes a lower valve body (1), an upper valve body (2), a valve core (3), a sleeve (4), a fixed iron core (5), a moving iron core (6), and a spring (7). The lower valve body (1) has an mounting cavity (11), the valve core (3) is assembled within the mounting cavity (11), and the upper valve body (2) is assembled at the opening of the mounting cavity (11) and circumferentially sealed to the lower valve body (1). The upper and lower ends of the sleeve (4) are fixed to the fixed iron core (5) and the upper valve body (2), respectively. The moving iron core (6) is located inside the sleeve (4) and can move vertically relative to the sleeve (4). The spring (7) is embedded in the fixed iron core (5) and the upper valve body (2). Between the moving iron cores (6), a magnetic ring (51) is coaxially embedded at the lower end of the fixed iron core (5); a flexible buffer (8) is embedded at the upper end of the moving iron core (6), the upper end of the flexible buffer (8) protrudes beyond the upper end of the moving iron core (6), and a flexible sealing element (9) is embedded at the lower end of the moving iron core (6); when the moving iron core (6) moves upward, the flexible buffer (8) abuts against the fixed iron core (5), and the flexible sealing element (9) releases its contact with the valve core (3) to open the solenoid valve; when the moving iron core (6) moves downward, the flexible sealing element (9) abuts against the valve core (3) to close the solenoid valve.

2. The silent solenoid valve according to claim 1, characterized in that: The flexible buffer (8) has a ring structure. The upper end of the moving iron core (6) is coaxially provided with an annular cavity (61), and the lower end of the flexible buffer (8) is embedded in the annular cavity (61).

3. The silent solenoid valve according to claim 2, characterized in that: The inner wall of the annular cavity (61) is provided with a first buckle (611) in the shape of an annular ring, and the outer wall of the lower end of the flexible buffer (8) is provided with a flange (81) in the shape of an annular ring. The flange (81) is fixed to the first buckle (611), and the shape of the flange (81) is adapted to the shape of the first buckle (611).

4. The silent solenoid valve according to claim 1, characterized in that: The moving iron core (6) has a groove (62) in the middle of its lower end. The flexible seal (9) is embedded in the groove (62). The inner circumferential wall of the groove (62) forms a second buckle (621) in the shape of a ring. The outer contour shape of the flexible seal (9) is adapted to the second buckle (621).

5. The silent solenoid valve according to claim 1, characterized in that: The upper valve body (2) forms an annular structure. A first annular step (21) is provided on the inner wall of the upper end of the upper valve body (2). The lower end of the sleeve (4) is coaxially inserted into the first annular step (21) and abuts against the first annular step (21). The lower end of the sleeve (4) is welded and fixed to the upper valve body (2).

6. The silent solenoid valve according to claim 1, characterized in that: A second annular step (52) is provided on the outer wall of the lower end of the fixed iron core (5). The upper end of the sleeve (4) is inserted into the second annular step (52) and abuts against the second annular step (52). The upper end of the sleeve (4) is welded and fixed to the fixed iron core (5).

7. The silent solenoid valve according to claim 1, characterized in that: The moving iron core (6) has a slot (63) with an open top on its inner side. The lower part of the spring (7) is inserted into the slot (63), and the lower end of the spring (7) abuts against the inner bottom of the slot (63). The upper end of the spring (7) abuts against the upper end of the fixed iron core (5).

8. The silent solenoid valve according to claim 1, characterized in that: The lower end of the upper valve body (2) is coaxially provided with an annular boss (22), which is threaded to the inner side of the mounting cavity (11) to fasten the upper valve body (2) and the lower valve body (1). A sealing ring (23) is embedded on the outer wall of the annular boss (22), which is used to seal the gap between the annular boss (22) and the mounting cavity (11).

9. The silent solenoid valve according to claim 8, characterized in that: The valve core (3) includes a diaphragm assembly (31) and a flexible sealing ring (30). The lower end of the diaphragm assembly (31) is coaxially provided with an annular groove (311). The flexible sealing ring (30) is embedded in the annular groove (311). The inner peripheral wall of the annular groove (311) forms a ring-shaped third buckle (312). The outer contour shape of the flexible sealing ring (30) is adapted to the third buckle (312). When the moving iron core (6) moves downward, the middle part of the upper end of the diaphragm assembly (31) is tightly sealed with the flexible sealing element (9), and the lower end of the flexible sealing ring (30) is tightly sealed with one end of the fluid outlet (12) located at the bottom of the mounting cavity (11).

10. The silent solenoid valve according to claim 9, characterized in that: The valve core (3) further includes a porous throttling ring (32), which includes an annular substrate (321) and a plurality of through holes (322) arranged circumferentially on the annular substrate (321). The porous throttling ring (32) is located below the diaphragm assembly (31), and the porous throttling ring (32) is vertically opposite to the fluid inlet (13) located at the bottom of the mounting cavity (11). A third annular step (14) is provided on the inner wall of the mounting cavity (11), and the outer edge of the porous throttling ring (32) is supported on the third annular step (14).

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