solenoid valve

Abstract

The utility model provides a kind of electromagnetic valve, including sleeve, static core, moving core and reset spring, the sleeve has accommodating cavity, at least a part of static core is arranged in accommodating cavity;At least a part of moving core is arranged in accommodating cavity, the moving core can be moved relative to static core;The moving core has center hole, center hole places reset spring, the reset spring is located between static core and moving core;Electromagnetic valve includes rubber stick or plastic stick, the rubber stick or plastic stick is placed in the reset spring;When the moving core is in the attraction position, the rubber stick or plastic stick is attached to the end face of the center hole close to static core;By rubber stick or plastic stick, reduce the noise that appears between static core and moving core impact.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, specifically to a solenoid valve with noise reduction effect. Background Technology

[0002] Patent application CN202421797264.X discloses a solenoid valve comprising: a valve body having a receiving cavity; a first iron core, at least a portion of which is disposed within the receiving cavity; a second iron core, at least a portion of which is disposed within the receiving cavity and is movable relative to the first iron core; a return spring located between the first and second iron cores; and a buffer structure movably sleeved on the return spring and located between the second and first iron cores. In this design, when the first and second iron cores are attracted together, the buffer structure, positioned between them, buffers the movement of the second iron core, preventing excessive impact between them. However, in this design, the buffer structure is a rubber O-ring sleeved on the outside of the return spring. With the continuous attracting and releasing action of the solenoid valve core, the second iron core repeatedly and indefinitely flattens the rubber O-ring, leading to fatigue failure of the rubber O-ring. Utility Model Content

[0003] The solenoid valve designed in this invention can at least partially solve the above problems.

[0004] The purpose of this utility model is to provide a solenoid valve, including a sleeve, a stationary iron core, a moving iron core, and a return spring. The sleeve has a receiving cavity, and at least a portion of the stationary iron core is disposed within the receiving cavity. At least a portion of the moving iron core is disposed within the receiving cavity, and the moving iron core is movable relative to the stationary iron core. The moving iron core has a central hole, and the return spring is placed in the central hole. The return spring is located between the stationary iron core and the moving iron core. The solenoid valve also includes a rubber rod or a plastic rod, which is placed inside the return spring. The rubber rod or plastic rod and the return spring are located between the stationary iron core and the moving iron core. When the moving iron core is in the released position, the rubber rod or plastic rod protrudes from the upper end face of the moving iron core. When the moving iron core is in the attracted position, the rubber rod or plastic rod adheres to the end face of the central hole near the stationary iron core.

[0005] In some embodiments, the solenoid valve further includes a metal rod placed inside a return spring and positioned below the rubber or plastic rod; the rubber or plastic rod and the metal rod are located between the stationary iron core and the moving iron core.

[0006] In some embodiments, the rubber rod or plastic rod is shaped like a frustum with a smaller top and a larger bottom on the side near the stationary iron core, and the rubber rod or plastic rod is shaped like a frustum with a larger top and a smaller bottom on the side near the moving iron core.

[0007] In some embodiments, the central hole is a through hole with a step in the middle, and a predetermined flow path is maintained between the metal rod and the upper end face of the step. A valve needle and a valve needle spring are placed in the lower section of the central hole; the two end faces of the metal rod have open grooves; and the upper section of the central hole has a transverse through hole.

[0008] In some embodiments, the height of the rubber or plastic rod is less than the height of the metal rod.

[0009] In some embodiments, the stiffness of the rubber or plastic rod is greater than the stiffness of the return spring.

[0010] In some embodiments, the outer diameter of the rubber or plastic rod is less than or equal to the outer diameter of the metal rod.

[0011] The solenoid valve of this invention includes a rubber or plastic rod, which is placed inside a return spring. The rubber or plastic rod and the return spring are positioned between the stationary iron core and the moving iron core. When the moving iron core is in the released position, the rubber or plastic rod protrudes from the upper end face of the moving iron core. When the moving iron core is in the engaged position, the rubber or plastic rod fits against the end face of the central hole near the stationary iron core. The rubber or plastic rod reduces noise caused by impact between the stationary and moving iron cores. Simultaneously, there is a limit between the stationary and moving iron cores, preventing the rubber rod from being compressed indefinitely and ensuring fatigue life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the internal structure of a solenoid valve in the closed state according to an embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the internal structure of a solenoid valve in the open state according to an embodiment of the present invention;

[0014] Figure 3 This is a three-dimensional structural diagram of the rubber rod of the solenoid valve according to an embodiment of the present invention.

[0015] In the picture:

[0016] 1. Valve seat; 2. Piston; 3. Main spring; 4. Stationary iron core; 5. Moving iron core; 6. Rubber rod; 7. Metal rod; 8. Return spring; 9. Valve needle; 10. Valve needle spring; 11. Retaining ring; 12. Valve cover; 13. Sleeve. Detailed Implementation

[0017] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, for clarity, the thickness of regions and layers is exaggerated. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0018] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0019] The embodiments described below are only some embodiments of this utility model, but the protection scope of this utility model is not limited thereto. All other embodiments obtained by those skilled in the art without inventive effort should be covered within the protection scope of this utility model.

[0020] Please refer to the reference. Figures 1 to 3 As shown, according to an embodiment of this utility model, a solenoid valve is provided. The solenoid valve includes a valve seat 1, a piston 2, a main spring 3, a stationary iron core 4, a moving iron core 5, a rubber rod 6, a metal rod 7, a return spring 8, a valve needle 9, a valve needle spring 10, a retaining ring 11, a valve cover 12, a sleeve 13, and a coil 100. The coil 100 is sleeved outside the sleeve 13. When the coil 100 is energized, it drives the moving iron core 5 to attract with the stationary iron core 4. When the coil 100 is de-energized, the return spring 8 drives the moving iron core 5 to release. The moving iron core drives the valve needle 9 and the valve needle spring 10 to control the opening and closing of the small valve port of the piston 2. Utilizing the pressure difference between the upper and lower ends of the piston chamber and the main spring 3, the piston 2 is controlled to move up and down within the valve seat 1 to open or close the valve port.

[0021] In this embodiment, the sleeve 13 and the valve seat 1 are fixedly connected by the valve cover 12. The piston 2 and the main spring 3 are inside the valve seat 1, with the main spring 3 on the valve port side of the valve seat 1. The sleeve 13 has a receiving cavity, and at least a portion of the stationary iron core 4 is disposed within the receiving cavity. At least a portion of the moving iron core 5 is disposed within the receiving cavity, and the moving iron core 5 is movable relative to the stationary iron core. The upper end of the moving iron core 5 is frustum-shaped, with the upper end face being the bottom of the frustum. The moving iron core has a central hole, and a return spring 8 is placed in the central hole. The return spring 8 is located between the stationary iron core 4 and the moving iron core 5. The solenoid valve also includes a rubber rod 6 and a metal rod 7, which are placed inside the return spring 8, with the metal rod 7 positioned below the rubber rod. The rubber rod and the return spring are located between the stationary iron core and the moving iron core. When the moving iron core is in the released position, the rubber rod protrudes from the upper end face of the moving iron core. When the moving iron core is in the attracted position, the rubber rod adheres to the end face of the central hole near the stationary iron core. The rubber rod cushions the impact of the moving iron core, reducing the noise generated when the stationary and moving iron cores engage. Simultaneously, the presence of a limit switch between the stationary and moving iron cores prevents the rubber rod from being compressed indefinitely, ensuring a longer fatigue life.

[0022] In this embodiment, the central hole is a through hole with a step in the middle. A predetermined flow path is maintained between the metal rod and the upper end face of the step. The lower section of the central hole of the moving iron core houses the valve needle 9 and the valve needle spring 10, and their positions are defined by the retaining ring 11. The upper section of the central hole has a transverse through hole to facilitate medium flow and prevent valve core jamming. In this embodiment, the metal rod is a cylindrical rod. In some embodiments, the two end faces of the metal rod may have open grooves (not shown). The orientation is not considered during assembly. These grooves are used to maintain a predetermined flow path between the metal rod and the upper end face of the step, further facilitating medium flow and preventing valve core jamming.

[0023] In this embodiment, refer to Figure 3 As shown, the rubber rod can be replaced with a plastic rod, which can be a fluoroplastic, such as polytetrafluoroethylene (PTFE). The rubber rod near the stationary iron core is shaped like a frustum of a cone, smaller at the top and larger at the bottom, while the rubber rod near the moving iron core is shaped like a frustum of a cone, larger at the top and smaller at the bottom. The frustum shape at both ends allows for assembly without considering orientation, preventing the rubber rod from being squeezed and expanding into the spring gap. The stiffness of the rubber or plastic rod is greater than that of the return spring, improving impact resistance. The outer diameter of the rubber or plastic rod is less than or equal to the outer diameter of the metal rod, preventing the rubber rod from being squeezed and expanding into the spring gap, while the outer diameter of the metal rod can simultaneously guide the spring. The height of the rubber or plastic rod is less than that of the metal rod, reducing the height of the rubber or plastic rod, increasing its stiffness and rigidity, and preventing the rubber or plastic rod from bending or tilting and extending into the spring gap.

[0024] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0025] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A solenoid valve, including: The solenoid valve comprises a sleeve, a stationary iron core, a moving iron core, and a return spring. The sleeve has a receiving cavity, and at least a portion of the stationary iron core is disposed within the receiving cavity. At least a portion of the moving iron core is disposed within the receiving cavity, and the moving iron core is movable relative to the stationary iron core. The moving iron core has a central hole, and the return spring is placed within the central hole, with the return spring located between the stationary iron core and the moving iron core. The solenoid valve further comprises a rubber rod or plastic rod placed within the return spring. The rubber rod or plastic rod and the return spring are located between the stationary iron core and the moving iron core. When the moving iron core is in the released position, the rubber rod or plastic rod protrudes from the upper end face of the moving iron core. When the moving iron core is in the engaged position, the rubber rod or plastic rod adheres to the end face of the central hole near the stationary iron core.

2. The solenoid valve according to claim 1, characterized in that, The stiffness of the rubber rod or plastic rod is greater than that of the reset spring.

3. The solenoid valve according to claim 1, characterized in that, The solenoid valve also includes a metal rod, which is placed inside the return spring and below the rubber or plastic rod; the rubber or plastic rod and the metal rod are located between the stationary iron core and the moving iron core.

4. The solenoid valve according to claim 1, characterized in that, The rubber or plastic rod is shaped like a frustum with a smaller upper part and a larger lower part on the side closest to the stationary iron core.

5. The solenoid valve according to claim 1, characterized in that, The rubber or plastic rod near the moving iron core is shaped like a frustum, wider at the top and narrower at the bottom.

6. The solenoid valve according to claim 3, characterized in that, The central hole is a through hole with a step in the middle. A predetermined flow path is maintained between the metal rod and the upper end face of the step. A valve needle and a valve needle spring are placed in the lower section of the central hole.

7. The solenoid valve according to claim 6, characterized in that, The metal rod has open grooves on both ends.

8. The solenoid valve according to claim 1, characterized in that, The upper section of the central hole has a transverse through hole.

9. The solenoid valve according to claim 3, characterized in that, The height of the rubber or plastic rod is less than the height of the metal rod.

10. The solenoid valve according to claim 3, characterized in that, The outer diameter of the rubber or plastic rod is less than or equal to the outer diameter of the metal rod.

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