A magnetic rotor assembly for an electronic expansion valve

Abstract

This utility model relates to the technical field of electronic expansion valves, and in particular to a magnetic rotor assembly for an electronic expansion valve. Its overall structure has high integration, fewer parts, which is beneficial for weight reduction, better quality, and cost advantage. It includes a screw, a magnetic ring, and a stop rod. The stop rod is installed inside the magnetic ring, and the screw is installed inside the magnetic ring. The screw is used for the up-and-down transmission of the valve needle component. The magnetic ring provides magnetism to provide driving force, and the stop rod provides a stopping function.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic expansion valves, and in particular to a magnetic rotor assembly for an electronic expansion valve. Background Technology

[0002] The expansion valve is a crucial component of an automotive air conditioning system. It throttles the high-temperature, high-pressure liquid refrigerant into low-temperature, low-pressure wet vapor, which then enters the evaporator to absorb heat and achieve a cooling effect. In situations with drastic load changes or complex operating conditions, traditional throttling devices (such as capillary tubes and thermostatic expansion valves) are no longer sufficient to meet comfort and energy-saving requirements. The temperature sensing bulb of a thermostatic expansion valve has a significant delay, making it difficult to respond quickly and effectively to changes in flow rate in accordance with compressor displacement. This ultimately leads to system oscillations, causing machine instability and even damage to the compressor network. Capillary tubes, on the other hand, cannot adjust flow rates for different operating conditions, failing to adapt to the changing demands of modern systems, impacting comfort and increasing energy consumption. Therefore, electronic expansion valves are gradually replacing traditional throttling devices. Electronic expansion valves outperform traditional throttling mechanisms in superheat control (level control) and flow regulation, offering faster response, wider adjustment range, and more significant energy savings, making them promising for future applications. However, existing electronic expansion valves may present several risks: 1. The stop rod press-fitting process has two options: one relies on a magnetic ring for limiting, which may damage the magnetic ring and make it difficult to identify, leading to subsequent magnetic ring cracking and valve body failure; the other relies on a fixed plate for limiting, typically made of powder metallurgy, which may affect the plate's strength and is also difficult to identify, leading to subsequent fixed plate breakage and valve body failure; 2. Common stop rod structures are right-angled, with a short side and a long side. The short side is welded, and the long side provides the stop. This structure leads to an off-center center of gravity, increased moment of inertia, and severe overall wear on the product; 3. Welding the fixed plate and the stop rod together using laser welding generates high temperatures, which may affect the strength of the fixed plate and the magnetic rotor. The high temperature may also affect the surface magnetic strength of the magnetic ring, and it introduces welding defects that may occur during assembly, which are difficult to identify as non-visual defects; 4. After the magnetic rotor assembly is welded to the screw, the center of gravity of rotation moves away from the fixed fulcrum A (the thread pitch diameter position), easily causing the magnetic rotor to wobble. Furthermore, the coaxiality requirement during the magnetic rotor's rotation becomes higher, indirectly increasing the product assembly requirements and raising the defect rate; 5. When the stop rod stops, the resulting impact generates a large torque force on both welds, which can cause the welds to detach, the connection to fail, and the product to fail. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a magnetic rotor assembly for an electronic expansion valve with high overall structural integration, fewer parts, which is conducive to lightweighting, better quality, and more cost-effectiveness.

[0004] This utility model discloses a magnetic rotor assembly for an electronic expansion valve, comprising a screw, a magnetic ring, and a stop rod. The stop rod is installed inside the magnetic ring, and the screw is installed inside the magnetic ring. The screw is used for the up-and-down transmission of the valve needle component. The magnetic ring provides magnetism to provide driving force, and the stop rod provides a stopping function. The screw, magnetic ring, and stop rod are integrally injection molded, reducing the number of fixed plate parts, lowering costs, reducing press-fitting and welding processes, reducing defects caused during assembly, and further reducing costs. The overall structure has high integration, fewer parts, which is conducive to lightweighting, better quality, and a more cost-effective approach.

[0005] Preferably, the lower end of the stop rod is configured with an H-shaped structure, with the shorter rod being thicker and the longer rod being thinner. The H-shaped structure increases the bonding strength with the magnetic ring. The thicker shorter rod and thinner longer rod of the stop rod facilitate the control of the center of gravity to fall on the axis of the screw, reducing various defects caused by the eccentricity of the center of gravity, and also reducing assembly requirements, thereby indirectly reducing costs.

[0006] Preferably, position a of the screw is the connection point with the bearing, which is the fulcrum position. Position b of the screw is knurled to increase the bonding strength between the screw and the magnetic ring. The screw and the stop rod are connected through a D-groove. The screw and the bearing are press-fitted together. The inverted structure of the magnetic rotor makes the center of rotation close to the fixed fulcrum a, reducing the coaxiality requirement of the product, increasing the assembly yield, and indirectly reducing costs. The screw and the stop rod are assembled and limited by a D-groove, which eliminates the need for welding, so that the stopping impact falls on the screw rather than the magnetic ring. (The stop rod and the screw can also be connected by press-fit welding.)

[0007] Preferably, a groove is provided on the bottom right side of the magnetic ring to facilitate the discharge of trapped liquid caused by the inverted magnetic rotor structure.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: the screw, magnetic ring and stop rod are injection molded in one piece, which reduces the number of fixed plate parts, reduces the cost, reduces the pressing and welding processes, reduces defects caused by the assembly process, reduces costs, has a high degree of overall structural integration, fewer parts, which is conducive to lightweighting, better quality and more cost-effective. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0011] Figure 3 This is a schematic diagram of the structure of the screw and stop rod after installation of this utility model;

[0012] Figure 4 This is a structural schematic diagram of the screw and stop rod of this utility model from another perspective after installation;

[0013] The following are labels in the attached diagram: 1. Screw; 2. Magnetic ring; 3. Stop rod; 4. Slot; 5. H-shaped structure; 6. D-shaped slot. Detailed Implementation

[0014] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0015] like Figures 1 to 4 As shown, the stop rod 3 is installed inside the magnetic ring 2, and the screw 1 is installed inside the magnetic ring 2. The screw 1 is used for the up and down transmission of the valve needle component. The magnetic ring 2 provides magnetism to provide driving force, and the stop rod 3 provides the stopping function. The screw 1, magnetic ring 2, and stop rod 3 are integrally injection molded. The lower end of the stop rod 3 is set as an H-shaped structure 5, and the short rod is thicker and the long rod is thinner. Position a of the screw 1 is the connection position with the bearing, which is the fulcrum position. Position b of the screw 1 is knurled to increase the bonding strength between the screw and the magnetic ring. The screw 1 and the stop rod 3 are connected through a D-shaped groove 6. A groove 4 is provided on the right side of the bottom of the magnetic ring 2.

[0016] The one-piece injection molding reduces the number of fixed plate parts, thereby reducing costs. It also reduces pressing and welding processes, minimizing defects during assembly and further reducing costs. The H-shaped structure 5 increases the bonding strength with the magnetic ring 2. The shorter rod of the stop rod 3 is thicker, while the longer rod is thinner, which facilitates control of the center of gravity to fall on the axis of the screw 1, reducing various defects caused by center of gravity eccentricity and lowering assembly requirements, thus indirectly reducing costs. The screw 1 and the bearing are press-fitted together. The inverted structure of the magnetic rotor brings the center of gravity closer to the fixed fulcrum a, reducing the coaxiality requirements of the product and increasing the assembly yield, thus indirectly reducing costs. The screw 1 and the stop rod 3 are assembled and limited by the D-shaped groove 6, eliminating the need for welding. This ensures that the stopping impact falls on the screw 1 rather than the magnetic ring 2. The slot 4 facilitates the discharge of liquid trapped due to the inverted structure of the magnetic rotor.

[0017] like Figures 1 to 4 As shown, the magnetic rotor assembly of the electronic expansion valve of this utility model, when working normally, the magnetic ring 2 drives the screw 1 to rotate, and the screw 1 drives the valve needle component through thread transmission to realize the change of the opening degree of the electronic expansion valve, thereby achieving the purpose of regulating the flow and pressure of the medium.

[0018] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A magnetic rotor assembly for an electronic expansion valve, characterized in that, It includes a screw (1), a magnetic ring (2) and a stop rod (3). The stop rod (3) is installed inside the magnetic ring (2), and the screw (1) is installed inside the magnetic ring (2). The screw (1) is used for the up and down transmission of the valve needle component. The magnetic ring (2) provides magnetism to provide driving force, and the stop rod (3) provides a stop function.

2. The magnetic rotor assembly of an electronic expansion valve as described in claim 1, characterized in that, The lower end of the stop rod (3) is set as an H-shaped structure (5), with the short rod being thicker and the long rod being thinner.

3. The magnetic rotor assembly of an electronic expansion valve as described in claim 1, characterized in that, The screw (1) at position a is the connection point with the bearing and is the fulcrum position. The screw (1) at position b is knurled to increase the connection strength between the screw and the magnetic ring. The screw (1) and the stop rod (3) are connected through the D-groove (6).

4. The magnetic rotor assembly of an electronic expansion valve as described in claim 1, characterized in that, The magnetic ring (2) has a slot (4) on the bottom right side.

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