Small-structure electromagnetic valve

Abstract

The utility model discloses a small-structure electromagnetic valve, and belongs to the technical field of control valves. The electromagnetic valve mainly comprises a coil mechanism part and an executing mechanism part, a fixed iron core is fixedly arranged in an axial central cavity of a hollow I-shaped coil holder of the coil mechanism part, a sleeve is arranged on the periphery of the fixed iron core in a sleeving mode, and the tail end of the sleeve is connected with a valve seat in a sealed mode; the valve seat is provided with an air inlet pipe communicated with the valve seat main cavity, and the valve seat is further provided with an air outlet pipe communicated with the valve seat circulation hole. A movable iron core is arranged below the fixed iron core, a spring cavity used for containing a spring is formed in the movable iron core, the spring cavity is communicated with the valve seat main cavity through an airflow balance through hole, and a sealing steel ball matched with the valve seat circulation hole is installed at the tail end of the movable iron core. According to the electromagnetic valve, the internal structural design is optimized, so that the magnetic force required by the action of internal parts is remarkably reduced, the dependence on the magnetic force of a coil is reduced, the consumption of raw materials is effectively reduced, the production cost is reduced, and the overall volume of the electromagnetic valve is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, and more specifically, to a small-structure solenoid valve used in refrigeration control systems, such as solenoid valves used in ice makers. Background Technology

[0002] In temperature control systems such as refrigeration, solenoid valves are a key component used to control the flow of media in pipelines. Typical applications include equipment such as ice makers.

[0003] Chinese patent publication number CN111615605B discloses an electromagnetic valve, specifically outlining the following technical solution: a valve body having a valve seat; a valve core having a valve core portion that contacts and separates from the valve seat; an electromagnetic actuator having a plunger for raising and lowering the valve core portion relative to the valve seat; and a first force-applying component that applies force to the plunger in either the opening or closing direction. The electromagnetic force of the electromagnetic actuator overcomes the force applied by the first force-applying component, thereby causing the plunger to move in either the opening or closing direction. The valve core and plunger are configured to move relative to each other, and a second force-applying component is provided to apply force to the valve core in another direction. The force of the second force-applying component is set to be smaller than that of the first force-applying component. As the valve core and plunger move relative to each other, the valve core and plunger lock together. When the electromagnetic actuator is not energized, the plunger moves in one direction by the force of the first force-applying component, the valve core and plunger lock together, and the valve core moves away from the valve seat by overcoming the force of the second force-applying component. When the electromagnetic actuator is energized, the plunger moves in another direction by overcoming the force of the first force-applying component, and the valve core is pressed against the valve seat by the force of the second force-applying component. For example, Chinese patent publication number CN102261508B also discloses an electromagnetic valve. The technical solution of this patent document includes a coil and a valve body. The coil includes a magnetic conductor, a frame, and an enameled wire winding wound on the frame. The coil also includes an encapsulation layer covering the magnetic conductor, the frame, and the enameled wire winding. The two end faces of the frame near the magnetic conductor are respectively provided with protrusions. The top surface of the protrusions abuts against the mating surface of the magnetic conductor facing the coil frame and is positioned, thereby forming a gap between the two end faces of the frame and the mating surface of the magnetic conductor facing the coil frame. The protrusions are located in the gaps, the gaps are filled by the encapsulation layer, and the protrusions are surrounded by the encapsulation layer.

[0004] Traditional solenoid valves have a relatively complex internal structure, requiring significant magnetic force to operate. This design necessitates winding a large amount of enameled wire around the solenoid coil, increasing its size and consequently raising raw material consumption and production costs. Furthermore, the larger size limits the flexibility of traditional solenoid valves in practical applications, making them unsuitable for space-constrained environments. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a small-structure solenoid valve for refrigeration control systems, such as the solenoid valve used in ice makers.

[0006] This utility model is achieved through the following technical solution:

[0007] A small-structure solenoid valve includes a coil mechanism and an actuator. The coil mechanism includes a coil assembly with an enameled wire coil wound on a hollow I-shaped wire frame, and the coil assembly is surrounded by a magnetic cylinder. A fixed iron core is fixedly installed in the axial central cavity of the hollow I-shaped wire frame, and a sleeve integrally fixed with the magnetic cylinder is sleeved around the fixed iron core. The end of the sleeve is sealed to a valve seat. An air inlet pipe communicating with the main chamber of the valve seat is installed on the valve seat, and an air outlet pipe communicating with the flow hole of the valve seat is also installed on the valve seat.

[0008] Below the fixed iron core is a moving iron core, which has a spring cavity for accommodating the spring. The spring cavity is connected to the main chamber of the valve seat through an airflow balance through hole. The fixed iron core is connected to the moving iron core via the spring, and in its natural state, the moving iron core and the fixed iron core are spaced apart. The end of the moving iron core is also equipped with a sealing steel ball that matches the flow hole of the valve seat.

[0009] Preferably, the upper end face of the hollow I-shaped wire frame is provided with a pin holder extending to the outside of the magnetic cylinder, and the upper end face of the pin holder is connected to a wire guide pin for winding the end of the enameled wire coil, and the side of the pin holder is provided with a wire routing groove to facilitate the routing of the enameled wire.

[0010] Preferably, the rotating surface of the hollow I-beam wire frame is provided with several equally spaced positioning grooves along the axial direction.

[0011] Preferably, a magnetic ring is embedded below the fixed iron core.

[0012] Preferably, the sealing steel ball is fixed to the moving iron core by riveting.

[0013] Preferably, the spring is a compression spring.

[0014] Preferably, the sleeve and valve seat, the valve seat and air inlet pipe, and the valve seat and air outlet pipe are all fixed together by welding.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention significantly reduces the magnetic force required for the operation of internal components by optimizing the internal structural design, thus reducing reliance on coil magnetism. This improvement drastically reduces the number of enameled wire turns required for the coil, resulting in a significantly smaller coil size, saving raw material consumption and reducing production costs. Furthermore, due to the reduced magnetic force requirement, this invention can utilize a compact, simple, and low-cost I-beam coil frame as the coil skeleton. The bidirectional compact design of the coil and valve body significantly reduces the overall size of the solenoid valve, greatly expanding its application scenarios and better meeting the needs of applications with high space requirements. This invention not only improves the product's economy and practicality but also significantly enhances its adaptability in complex environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 .

[0019] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 4 This is a utility model Figure 3 Enlarged view of point A in the middle.

[0021] In the diagram: 1. Coil mechanism; 11. Hollow I-shaped wire frame; 111. Pin holder; 112. Wire guide pin; 113. Wire routing groove; 115. Wire fixing groove; 12. Magnetic guide cylinder; 2. Actuator mechanism; 21. Fixed iron core; 22. Spring; 23. Sleeve; 24. Moving iron core; 25. Spring cavity; 26. Valve seat; 261. Valve seat main chamber; 262. Valve seat flow hole; 27. Sealing steel ball; 28. Magnetic ring; 29. ​​Airflow balance through hole; 31. Inlet pipe; 32. Outlet pipe. Detailed Implementation

[0022] To enable readers to better understand the design intent of this utility model, the technical solution described below is further described in conjunction with embodiments. It should be noted that directional terms that may appear in the following paragraphs, including but not limited to "up," "down," "left," "right," "front," and "back," are based on the visual orientation shown in the accompanying drawings and should not be considered as limitations on the scope of protection or technical solution of this utility model. Their purpose is solely to facilitate a better understanding of the technical solution described in this utility model by those skilled in the art.

[0023] In this specification, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Example 1:

[0025] like Figures 1 to 4A small-structure solenoid valve includes a coil mechanism and an actuator. The coil mechanism 1 includes a coil assembly with an enameled wire coil wound on a hollow I-shaped coil frame 11, and the coil assembly is surrounded by a magnetic cylinder 12. The hollow I-shaped coil frame 11 is installed inside the magnetic cylinder 12 and is limited by the top and bottom plates of the magnetic cylinder 12. A fixed iron core 21 is fixedly installed in the axial central cavity of the hollow I-shaped coil frame 11, and a sleeve 23, which is integrally fixed with the magnetic cylinder 12, is sleeved around the fixed iron core 21. The end of the sleeve 23 is sealed to the valve seat 26. The axial central cavity space of the hollow I-shaped coil frame 11 is fully utilized, providing favorable conditions for the miniaturization design of the entire product. In this embodiment, an air inlet pipe 31 communicating with the main chamber 261 of the valve seat is installed on the valve seat 26. An air outlet pipe 32 communicating with the flow hole 262 of the valve seat is also installed on the valve seat 26. The flow hole 262 of the valve seat and the main chamber 261 of the valve seat are connected without the sealing steel ball 27 blocking them. A moving iron core 24 is provided below the fixed iron core 21. The moving iron core 24 has a spring cavity 25 for accommodating the spring 22. The spring cavity 25 is connected to the main chamber 261 of the valve seat through the airflow balance through hole 29. A sealing steel ball 27 adapted to the flow hole 262 of the valve seat is also installed at the end of the moving iron core 24. The internal structure design is simple and reasonable. The fixed iron core 21 is connected to the moving iron core 24 via the spring 22. In the natural state, the moving iron core 24 and the fixed iron core 21 are spaced apart. At this time, the sealing steel ball 27 seals the flow hole 262 of the valve seat. In other words, in this embodiment, the valve is normally closed and is a normally closed solenoid valve. Except for the coil mechanism 1, the inlet pipe 31, and the outlet pipe 32, all other components can be considered as actuators.

[0026] The specific operation process of this embodiment is as follows: When the coil assembly is energized, it generates a magnetic field, which magnetizes the iron core and generates magnetic force. The moving iron core 24 drives the sealing steel ball 27 to move upward against the spring force of the spring 22. The sealing steel ball 27 does not contact the valve seat flow hole 262, and the valve seat main chamber 261 and the valve seat flow hole 262 are connected, thereby connecting the air inlet pipe 31 and the air outlet pipe 32. When the coil assembly is de-energized, under the action of the spring 22, the moving iron core 24 returns to its original position, and the sealing steel ball 27 blocks the valve seat flow hole 262, so the air inlet pipe 31 and the air outlet pipe 32 are no longer connected.

[0027] This embodiment significantly reduces the magnetic force required for the operation of internal components by optimizing the internal structural design, thus reducing reliance on coil magnetism. This improvement drastically reduces the number of enameled wire turns required for the coil, resulting in a significantly smaller coil size, saving raw material consumption and reducing production costs. Furthermore, due to the reduced magnetic force requirement, this invention can utilize a compact, simple, and low-cost I-beam coil frame as the coil skeleton. The bidirectional compact design of the coil and valve body significantly reduces the overall size of the solenoid valve, greatly expanding its application scenarios and better meeting the needs of applications with high space requirements. This invention not only improves the product's economy and practicality but also significantly enhances its adaptability in complex environments.

[0028] Example 2:

[0029] Based on Embodiment 1, this embodiment continues to describe in detail the technical features involved therein and the functions and roles of these technical features in this utility model, so as to help those skilled in the art to fully understand the technical solution of this utility model and reproduce it.

[0030] like Figures 1 to 4 A small-structure solenoid valve includes a coil mechanism and an actuator. The coil mechanism 1 includes a coil assembly on which an enameled wire coil is wound on a hollow I-shaped wire frame 11. The coil assembly is surrounded by a magnetic cylinder 12. The hollow I-shaped wire frame 11 is installed inside the magnetic cylinder 12 and is limited by the top and bottom plates of the magnetic cylinder 12. The upper end face of the hollow I-shaped wire frame 11 is provided with a pin seat 111 extending to the outside of the magnetic cylinder 12. A wire guide pin 112 for winding the end of the enameled wire coil is inserted into the upper end face of the pin seat 111. The side of the pin seat 111 is provided with a wire routing groove 113 to facilitate the routing of the enameled wire. In this embodiment, the hollow I-shaped wire frame 11 makes full use of the axial space and avoids occupying additional radial space, achieving a compact vertical layout. Moreover, the enameled wire is easy to wind and route, and is not easy to break. In addition, the rotating surface of the hollow I-shaped wire frame 11 is provided with several equally spaced wire-fixing grooves 115 along the axial direction. The design of the wire-fixing grooves 115 is conducive to achieving neat and regular winding, which can effectively improve the overall performance and reliability of the product.

[0031] In this embodiment, a fixed iron core 21 is fixedly installed in the axial central cavity of the hollow I-shaped wire frame 11. A sleeve 23, which is integrally fixed with the magnetic cylinder 12, is fitted around the fixed iron core 21. The end of the sleeve 23 is sealed to the valve seat 26. The axial central cavity space of the hollow I-shaped wire frame 11 is fully utilized, providing favorable conditions for the miniaturization design of the entire product. In this embodiment, an air inlet pipe 31 connected to the main chamber 261 of the valve seat is installed on the valve seat 26. An air outlet pipe 32 connected to the flow hole 262 of the valve seat is also installed on the valve seat 26. The flow hole 262 of the valve seat is connected to the main chamber 261 of the valve seat without being blocked by the sealing steel ball 27. A moving iron core 24 is provided below the fixed iron core 21. The moving iron core 24 has a spring cavity 25 for accommodating the spring 22. The spring cavity 25 is connected to the main chamber 261 of the valve seat through an airflow balance through hole 29. The spring 22 is a compression spring. The airflow balancing through-hole 29 is used to balance the internal pressure of the solenoid valve, preventing internal air pressure imbalance from affecting the normal operation of the product. A sealing steel ball 27, compatible with the valve seat flow hole 262, is installed at the end of the moving iron core 24. The sealing steel ball 27 is riveted to the moving iron core 24. A magnetic ring 28, which enhances the magnetic force, is embedded below the fixed iron core 21. The fixed iron core 21 is connected to the moving iron core 24 via a spring 22. In its natural state, the moving iron core 24 and the fixed iron core 21 are spaced apart, at which point the sealing steel ball 27 seals the valve seat flow hole 262. In this embodiment, the sleeve 23 and valve seat 26, the valve seat 26 and inlet pipe 31, and the valve seat 26 and outlet pipe 32 are all fixed together by welding. The sleeve 23 and valve seat 26 form a weld ring through welding, achieving both a fixed connection and a sealed connection. Similarly, weld rings are formed between valve seat 26 and air inlet pipe 31, and between valve seat 26 and air outlet pipe 32, respectively, through welding processes.

[0032] In summary, this is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent variations and modifications made in accordance with the shape, structure, features and spirit of the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. A small-structure solenoid valve, comprising a coil mechanism and an actuator, characterized in that: The coil mechanism (1) includes a coil assembly on which an enameled wire coil is wound on a hollow I-beam coil frame (11), and the coil assembly is surrounded by a magnetic cylinder (12); a fixed iron core (21) is fixedly provided in the axial central cavity of the hollow I-beam coil frame (11), and a sleeve (23) fixedly integrated with the magnetic cylinder (12) is sleeved around the fixed iron core (21), and the end of the sleeve (23) is sealed to the valve seat (26); an air inlet pipe (31) connected to the main chamber (261) of the valve seat is installed on the valve seat (26), and an air outlet pipe (32) connected to the flow hole (262) of the valve seat is also installed on the valve seat (26). Below the fixed iron core (21) is a movable iron core (24), which has a spring cavity (25) for accommodating the spring (22). The spring cavity (25) is connected to the main chamber of the valve seat (261) through the airflow balance through hole (29). The fixed iron core (21) is connected to the movable iron core (24) through the spring (22), and in its natural state, the movable iron core (24) and the fixed iron core (21) are spaced apart. The end of the movable iron core (24) is also equipped with a sealing steel ball (27) that is compatible with the flow hole (262) of the valve seat.

2. The small-structure solenoid valve according to claim 1, characterized in that: The upper end face of the hollow I-shaped wire frame (11) is provided with a pin seat (111) extending to the outside of the magnetic cylinder (12). The upper end face of the pin seat (111) is connected to a wire needle (112) for winding the end of the enameled wire coil. The side of the pin seat (111) is provided with a wire groove (113) to facilitate the routing of the enameled wire.

3. A small-structure solenoid valve according to claim 1 or 2, characterized in that: The rotating surface of the hollow I-beam wire frame (11) is provided with several equally spaced wire-fixing grooves (115) along the axial direction.

4. A small-structure solenoid valve according to claim 1, characterized in that: A magnetic ring (28) is embedded below the fixed iron core (21).

5. A small-structure solenoid valve according to claim 1, characterized in that: The sealing steel ball (27) is fixedly connected to the moving iron core (24) by riveting.

6. A small-structure solenoid valve according to claim 1, characterized in that: The spring (22) is a compression spring.

7. A small-structure solenoid valve according to claim 1, characterized in that: The sleeve (23) and valve seat (26), the valve seat (26) and air inlet pipe (31), and the valve seat (26) and air outlet pipe (32) are all fixed together by welding.

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