Suction assembly and manufacturing method thereof, electromagnetic valve, and auxiliary coil size determination method

Abstract

This invention provides an attraction component and its manufacturing method, a solenoid valve, and a method for determining the size of an auxiliary coil, relating to the field of control valve technology. The attraction component includes a stationary iron core and an auxiliary coil. A fixing groove is provided on the end face of the stationary iron core facing the moving iron core. The auxiliary coil is disposed within the fixing groove. The auxiliary coil is made of conductive material and can replace existing magnetic rings. In different AC four-way solenoid valves, the size parameters of the auxiliary coil can be flexibly adjusted according to different size requirements. One auxiliary coil can be used with different stationary iron cores, and the auxiliary coil structure has good adaptability and versatility. The auxiliary coil is fixed to the stationary iron core using an embedded assembly method, ensuring the consistency of the dimensions of the stationary iron core and the auxiliary coil, preventing dimensional errors caused by press-fitting, and ensuring the performance of the solenoid valve.

Description

Technical Field

[0001] This invention generally relates to the field of control valve technology, and more specifically, to an attraction component and its manufacturing method, a solenoid valve, and a method for determining the size of an auxiliary coil. Background Technology

[0002] The existing solenoid valve's attractor assembly includes an attractor and a magnetic separator ring, with the magnetic separator ring mounted on the attractor. During assembly, the magnetic separator ring is first press-fitted onto the attractor, and then the end face of the attractor is machined off. Because the attractor and magnetic separator ring use an interference fit, although they won't fall off, the mutual compressive force during press-fitting causes slight dimensional changes in both the attractor and magnetic separator ring. This results in inconsistent dimensionality between the attractor and magnetic separator ring, affecting the solenoid valve's performance. Furthermore, each magnetic separator ring can only be paired with one attractor; different sizes of attractors require different sized magnetic separator rings, leading to poor versatility. Summary of the Invention

[0003] This invention provides an attraction component and its manufacturing method, a solenoid valve, and a method for determining the size of an auxiliary coil, thereby improving versatility and saving production costs.

[0004] According to a first aspect of the present invention, an attraction component is provided, comprising:

[0005] A stationary iron core, wherein a fixing groove is provided on the end face of the stationary iron core facing the moving iron core;

[0006] An auxiliary coil is disposed within the fixing slot;

[0007] The auxiliary coil is made of conductive material and is configured as an arc segment with no connection between its beginning and end; or, the auxiliary coil is configured as a spiral shape with no connection between its beginning and end.

[0008] In some embodiments, when the auxiliary coil is configured as a spiral with no ends connected, the auxiliary coil has multiple turns.

[0009] In some implementations, it also includes:

[0010] A bracket is disposed within the fixed groove, and the auxiliary coil is wound around the bracket.

[0011] In some embodiments, the support includes:

[0012] The auxiliary coil is wound around the fixing part;

[0013] A limiting part is disposed at at least one end of the fixing part along the axial direction of the stationary iron core, and the limiting part is used to limit the auxiliary coil.

[0014] In some embodiments, the limiting part is provided at one end of the fixing part facing the opening of the fixing groove.

[0015] In some embodiments, a gap is provided between the limiting portion and at least one groove wall of the fixing groove along the radial direction of the stationary iron core.

[0016] In some embodiments, the fixing part is columnar or cylindrical, and the stationary iron core is coaxially arranged with the fixing part.

[0017] In some embodiments, the bracket contacts at least one groove wall of the fixing groove along the radial direction of the stationary iron core.

[0018] In some implementations, it also includes:

[0019] A fixing adhesive is filled into the fixing groove to fix the auxiliary coil.

[0020] In some embodiments, the projections of the auxiliary coil and the fixing adhesive onto the reference plane are located inside the projection of the fixing groove onto the reference plane;

[0021] The reference plane is parallel to the axial direction of the stationary iron core.

[0022] According to a second aspect of the present invention, embodiments of the present invention also provide a method for manufacturing an attraction component, for manufacturing the above-described attraction component, the method for manufacturing the attraction component comprising the following steps:

[0023] A fixing groove is made on the end face of the stationary iron core facing the moving iron core;

[0024] Place the auxiliary coil in the fixed slot.

[0025] In some embodiments, the following steps are included before placing the auxiliary coil into the fixing slot:

[0026] The auxiliary coil is wound onto the bracket;

[0027] Place the bracket with the auxiliary coil into the fixing slot.

[0028] In some embodiments, the following steps are included before placing the bracket with the auxiliary coil into the fixing slot:

[0029] A fixing adhesive is applied between the auxiliary coil and the bracket and then cured.

[0030] In some embodiments, the following steps are included after the auxiliary coil is placed in the fixing slot:

[0031] Fill the gap between the auxiliary coil and the fixing groove with the fixing adhesive and let it cure.

[0032] In some embodiments, the curing temperature of the fixative is 40°C to 60°C, and the curing time of the fixative is 1.5h to 2.5h.

[0033] According to a third aspect of the present invention, an embodiment of the present invention also provides a solenoid valve, including a moving iron core, a valve sleeve, a coil, and the above-described attraction assembly, wherein the moving iron core and the attraction assembly are disposed inside the valve sleeve, the coil is sleeved outside the valve sleeve, and the attraction assembly is configured to generate magnetic force and attract or release the moving iron core, so that the moving iron core slides relative to the valve sleeve.

[0034] According to a fourth aspect of the present invention, embodiments of the present invention also provide a method for determining the size of an auxiliary coil, the auxiliary coil comprising at least one turn of coil disposed in a fixed groove on a stationary iron core, the fixed groove being disposed on a first end face of the stationary iron core facing the moving iron core, the stationary iron core and the auxiliary coil constituting an attraction assembly to provide an electromagnetic force for attracting or releasing the moving iron core, the method comprising:

[0035] The total magnetic flux to be provided by the auxiliary coil is determined based on the electromagnetic force to be provided.

[0036] By iterating multiple times, the position of the fixed slot on the stationary iron core is set, and the first magnetic flux and the second magnetic flux that the auxiliary coil can provide are determined until the first area and the second area that can provide the total magnetic flux are obtained. The first area is the area on the first end face outside the fixed slot, the second area is the area on the first end face inside the fixed slot, the first magnetic flux is the magnetic flux provided by the first area, the second magnetic flux is the magnetic flux provided by the second area, and the direction of the first magnetic flux is opposite to the direction of the second magnetic flux.

[0037] By iterating multiple times, the resistance estimate of the auxiliary coil is set, the number of turns of the auxiliary coil is determined based on the first area and the second area, and the result is compared with the specification information of the selected coil material to determine the size information of the auxiliary coil that meets the conditions.

[0038] In some embodiments, the position of the fixed slot on the stationary iron core is set through multiple iterations, and the first and second magnetic flux provided by the auxiliary coil are determined until a first and second area that can provide the total magnetic flux are obtained, including:

[0039] The position of the fixing groove on the stationary iron core is set;

[0040] Based on the position of the fixing groove on the first end face, determine the first area and the second area on the first end face;

[0041] The first magnetic flux that the auxiliary coil can provide is determined based on the first area; the second magnetic flux that the auxiliary coil can provide is determined based on the second area.

[0042] Based on the first and second magnetic flux provided by the auxiliary coil, determine whether the first and second areas on the first end face satisfy the total magnetic flux.

[0043] If not, repeat the above steps;

[0044] If so, then stop iterating.

[0045] In some embodiments, the first magnetic flux and the second magnetic flux are calculated using the following formula:

[0046] Φ1=I·N·G Z1 ;

[0047] Φ2=I·N·G Z2 ;

[0048] in,

[0049]

[0050] Where Φ1 represents the first magnetic flux; Φ2 represents the second magnetic flux; I represents the induced current; N represents the number of coil turns; G Z1 G represents the magnetic permeability corresponding to the first area S1; Z2 S1 represents the magnetic permeability corresponding to the second area S2; S2 represents the area on the first end face of the stationary iron core outside the fixed slot; μ0 represents the air permeability; δ represents the gap through which the magnetic circuit flows.

[0051] In some implementations, the resistance estimate of the auxiliary coil is set through multiple iterations. The number of turns of the auxiliary coil is determined based on the first area and the second area, and compared with the specifications of the selected coil material to determine the size information of the auxiliary coil that meets the conditions, including:

[0052] Set the estimated resistance value of the auxiliary coil;

[0053] Based on the first area, the second area, and the estimated resistance value of the auxiliary coil, determine the estimated number of turns of the auxiliary coil;

[0054] The estimated resistance and the estimated number of turns of the auxiliary coil are compared with the actual resistance and the actual number of turns of the auxiliary coil, wherein the actual resistance and the actual number of turns of the auxiliary coil are determined based on the specifications of the selected coil material.

[0055] Based on the comparison results, determine whether the size information of the auxiliary coil meets the requirements;

[0056] If not, repeat the above steps;

[0057] If so, then stop iterating.

[0058] In some embodiments, the estimated resistance of the auxiliary coil is calculated using the following formula:

[0059]

[0060] Where w = 2πf;

[0061] Where R represents the estimated resistance of the auxiliary coil; w represents the angular frequency of the driving power supply; μ0 represents the permeability of air; S1 represents the area on the first end face of the stationary iron core outside the fixed slot; S2 represents the area on the first end face of the stationary iron core inside the fixed slot; and f represents the frequency of the driving power supply.

[0062] In some embodiments, determining the estimated number of turns of the auxiliary coil based on the first area, the second area, and the estimated resistance of the auxiliary coil includes:

[0063] Determine the induced electromotive force of the auxiliary coil;

[0064] Calculate the induced current in the auxiliary coil based on the estimated values ​​of the induced electromotive force and resistance of the auxiliary coil.

[0065] The estimated number of turns of the auxiliary coil is calculated using the following formula:

[0066] Φ=I·N·G Z ;

[0067] in,

[0068] Where Φ represents magnetic flux; I represents induced current; N represents the number of coil turns; G Z δ represents the magnetic permeability in the magnetic circuit; μ0 represents the air permeability; S represents the area through which the magnetic flow passes; δ represents the gap through which the magnetic flow passes.

[0069] In some embodiments, the induced electromotive force of the auxiliary coil is determined based on the induced electromotive force of the main coil of the solenoid valve.

[0070] In some embodiments, the actual resistance and the actual number of turns of the auxiliary coil are determined by the following formula:

[0071]

[0072] Where R represents the resistance of the auxiliary coil; ρ represents the resistivity of the auxiliary coil; l cs q represents the total length of the auxiliary coil; s N represents the cross-sectional area of ​​the selected coil material; a The number of turns of the auxiliary coil is indicated; r1 represents the inner diameter of the auxiliary coil mounting position; r2 represents the outer diameter of the auxiliary coil mounting position; δ4 represents the height of the auxiliary coil; d a This indicates the wire diameter of the selected coil material.

[0073] One embodiment of the present invention has the following advantages or beneficial effects:

[0074] The attraction component and solenoid valve provided in this invention feature an auxiliary coil made of conductive material. This auxiliary coil replaces the existing magnetic ring, allowing for flexible adjustment of the auxiliary coil's dimensions to meet different size requirements in various solenoid valves. A single auxiliary coil can be used with stationary iron cores of different sizes, demonstrating good adaptability and versatility. Compared to existing methods using magnetic rings, the manufacturing method of the attraction component provided in this invention reduces copper usage, thereby lowering costs. Furthermore, replacing the magnetic ring with an auxiliary coil allows for the direct use of the slot structure used to accommodate the magnetic ring, resulting in lower modification costs.

[0075] The manufacturing method of the attraction component provided in this invention, compared with the existing method using a magnetic separator ring, reduces the amount of copper used by employing an auxiliary coil, thereby lowering costs. Replacing the magnetic separator ring with an auxiliary coil allows for the direct use of existing slot structures for accommodating the magnetic separator ring, resulting in low modification costs. Furthermore, placing the auxiliary coil within the fixed slot creates a certain distance between the top surface of the auxiliary coil and the end face of the moving iron core. Even when impacted at the attraction position, the moving iron core and the auxiliary coil will not directly contact each other, extending the service life of the auxiliary coil.

[0076] The auxiliary coil size determination method provided in this embodiment of the invention aims to meet the electromagnetic force required by the auxiliary coil under different operating conditions. To determine the size information of the auxiliary coil, the total magnetic flux to be provided by the auxiliary coil can be determined first based on the electromagnetic force to be provided. After determining the first and second areas that can provide the required total magnetic flux, the optimal size information of the auxiliary coil 2 can be given through theoretical calculations. Attached Figure Description

[0077] To better understand the present invention, reference may be made to the embodiments shown in the following drawings. Components in the drawings are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of the invention. Furthermore, related elements or components may have different arrangements as known in the art. Additionally, in the drawings, the same reference numerals denote the same or similar components in various figures. The above and other features and advantages of the present invention will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0078] in:

[0079] Figure 1 The diagram shown is a structural schematic of a solenoid valve according to an embodiment of the present invention;

[0080] Figure 2 The figure shown is a cross-sectional view of a solenoid valve according to an embodiment of the present invention;

[0081] Figure 3 The diagram shown is a structural schematic of an attraction component according to an embodiment of the present invention. Figure 1 ;

[0082] Figure 4 This is a schematic diagram of the structure of an attraction component according to an embodiment of the present invention. Figure 2 ;

[0083] Figure 5 The diagram shown is a cross-sectional view of an attraction component according to an embodiment of the present invention;

[0084] Figure 6 The diagram shown is a structural schematic of an attraction component according to another embodiment of the present invention. Figure 1 ;

[0085] Figure 7 This is a schematic diagram of the structure of an attraction component according to another embodiment of the present invention. Figure 2 ;

[0086] Figure 8 The diagram shown is a cross-sectional view of an attraction component according to another embodiment of the present invention;

[0087] Figure 9 This is a schematic diagram of the structure of the support in the attraction component according to another embodiment of the present invention;

[0088] Figure 10 The diagram shown is a simulation of the electromagnetic force changing over time at the engagement position of a conventional solenoid valve.

[0089] Figure 11 The diagram shown is a simulation schematic of the electromagnetic force of the solenoid valve of the present invention changing over time at the energized position.

[0090] Figure 12 The diagram illustrates the flowchart of the auxiliary coil size determination method of the present invention. Figure 1;

[0091] Figure 13 The diagram illustrates the flowchart of the auxiliary coil size determination method of the present invention. Figure 2 ;

[0092] Figure 14 The diagram illustrates the flowchart of the auxiliary coil size determination method of the present invention. Figure 3 ;

[0093] Figure 15 The diagram illustrates the principle of the auxiliary coil size determination method of the present invention. Figure 1 ;

[0094] Figure 16 The diagram illustrates the principle of the auxiliary coil size determination method of the present invention. Figure 2 .

[0095] The reference numerals in the attached figures are explained as follows:

[0096] 100. Suction assembly; 200. Moving iron core; 300. Valve sleeve; 400. Electromagnetic coil; 500. Valve seat; 600. Valve body; 700. Reset component; 800. Mounting screw; 900. Valve stem; 101. Inlet; 102. Switching port; 103. Valve port;

[0097] 1. Static iron core; 11. Fixing slot; 111. Slot opening; 112. Inner slot wall; 113. Outer slot wall; 114. Slot bottom; 2. Auxiliary coil; 3. Bracket; 31. Fixing part; 32. Limiting part. Detailed Implementation

[0098] The technical solutions of the exemplary embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present invention.

[0099] In the description of this invention, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the / described" object or "an" object are also intended to indicate one of a possible plurality of such objects.

[0100] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be 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 this invention according to the specific circumstances.

[0101] Furthermore, in the description of this invention, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this invention. It should also be understood that, in the context of an element or feature being connected to another element (one or more) "upper," "lower," "inner," or "outer," it can be directly connected to the other element (one or more) "upper," "lower," "inner," or "outer," or indirectly connected to the other element (one or more) "upper," "lower," "inner," or "outer" through an intermediate element.

[0102] 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, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0103] This embodiment provides a solenoid valve, particularly suitable as a pilot valve for a four-way solenoid valve. For example... Figures 1-2As shown, the solenoid valve includes a moving iron core 200, a valve body 300, an electromagnetic coil 400, and a suction assembly 100. The moving iron core 200 and the suction assembly 100 are disposed within the valve body 300. Exemplarily, the valve body 300 has an open end structure, and the suction assembly 100 is fixed to the open end of the valve body 300, forming a closed valve cavity between the suction assembly 100 and the valve body 300. The closed end of the valve body 300 is provided with an inlet 101 and three switching ports 102, with the inlet 101 communicating with the valve cavity. A valve seat 500 and a slider 600 are disposed within the valve cavity. The valve seat 500 is welded and fixed to the valve body 300, and the slider 600 is disposed at the end of the moving iron core 200 away from the suction assembly 100 via a valve stem 900, allowing the moving iron core 200 to drive the slider 600 to slide relative to the valve seat 500 via the valve stem 900. A reset member 700 is also provided between the attraction assembly 100 and the moving iron core 200. The reset member 700 is specifically a cylindrical spring, with one end abutting against the attraction assembly 100 and the other end abutting against the central hole of the moving iron core 200. An electromagnetic coil 400 is sleeved on the outside of the valve body 300 and is fixed to the attraction assembly 100 by mounting screws 800. The attraction assembly 100 is configured to generate magnetic force and attract or release the moving iron core 200, causing the moving iron core 200 to slide relative to the valve body 300.

[0104] When the electromagnetic coil 400 is energized and generates a magnetic field, the attraction component 100 generates a magnetic force and attracts the moving iron core 200. Under the action of the magnetic field, the moving iron core 200 drives the slider 600 to move, so that one of the three switching ports 102 is connected to the valve cavity, and the other two switching ports 102 are connected to each other, allowing the medium flowing in from the inlet 101 to enter the valve cavity and flow out through the switching port 102 connected to the valve cavity. As the moving iron core 200 approaches the attraction component 100, it compresses the reset component 700. When the electromagnetic coil 400 is de-energized, under the restoring force of the compressed reset component 700, the moving iron core 200 moves away from the attraction component 100. During the reset process, the moving iron core 200 drives the slider 600 to move relative to the valve seat 500, so that another switching port 102 is connected to the valve cavity, and the other two switching ports 102 are connected to each other, allowing the medium flowing in from the inlet 101 to enter the valve cavity to flow out through the switching port 102 connected to the valve cavity.

[0105] The medium can be a refrigerant. By changing the switching port 102 that flows through the valve cavity, the flow channel of the medium is changed, thereby changing the flow direction of the medium.

[0106] Because the electromagnetic coil 400 generates a magnetic circuit when energized, if it is powered by a single-phase power supply, the attraction force generated by the alternating magnetic flux crosses zero twice per cycle. For example, in a 50Hz circuit, this occurs 100 times per second. When the current is zero, the electromagnetic attraction force generated by the electromagnetic coil 400 is also zero, causing the moving iron core 200 to momentarily detach. The moving iron core 200 returns to its released state due to the loss of attraction. However, after a very short time, even before the moving iron core 200 has had time to move a considerable distance, the current immediately increases again, and the electromagnetic coil 400 generates electromagnetic attraction, causing the attraction component 100 to momentarily attract the moving iron core 200 again. Using this method, as the current changes periodically, the moving iron core 200 continuously switches between momentary release and attraction, thus generating high-frequency vibrations and noise.

[0107] To address this issue, existing technology includes a magnetic ring on the side of the attraction component 100 facing the moving iron core 200. Since electromagnetic induction generates an induced current in the magnetic ring, this induced current produces an induced magnetic field. Even when the current is zero, electromagnetic attraction still exists, thus overcoming the vibration and noise generated when the electromagnetic attraction is zero.

[0108] During assembly, the magnetic ring is first press-fitted onto the suction assembly 100, and then the end face of the suction assembly 100 is machined off. Because the suction assembly 100 and the magnetic ring use an interference fit, although they won't fall off, the pressing process causes slight changes in the dimensions of the suction assembly 100 and the magnetic ring due to mutual pressure. This makes it impossible to maintain dimensional consistency between the suction assembly 100 and the magnetic ring, thus affecting the performance of the solenoid valve. Furthermore, if the fit between the suction assembly 100 and the magnetic ring becomes loose, both components will become unusable, increasing initial costs. Long-term impact between the moving iron core 200 and the suction assembly 100 can also cause the magnetic ring to detach from the suction assembly 100, shortening its service life.

[0109] To address this issue, this embodiment also provides an attraction component 100, such as... Figures 3-5 As shown, the attraction assembly 100 includes a stationary iron core 1 and an auxiliary coil 2. A fixing groove 11 is provided on the end face of the stationary iron core 1 facing the moving iron core 200, and the auxiliary coil 2 is disposed in the fixing groove 11.

[0110] For example, the stationary iron core 1 has a cylindrical shape. The end face of the stationary iron core 1 facing the moving iron core 200 along the axial direction of the stationary iron core 1 is the upper end face. The fixing groove 11 is provided on the upper end face to shorten the distance between the auxiliary coil 2 and the moving iron core 200, so that the induced magnetic field generated by the auxiliary coil 2 can provide sufficient electromagnetic force to the moving iron core 200, thereby reducing the vibration and noise generated when the electromagnetic attraction is zero.

[0111] For example, the fixing groove 11 is an annular structure, and the auxiliary coil 2 can be continuously and uninterruptedly wound within the fixing groove 11. Specifically, the fixing groove 11 can be an annular groove, such as a square annular groove, a circular annular groove, or other polygonal annular groove structures. In this embodiment, a circular annular groove can be selected, whose structural shape matches the shape of the stationary iron core 1, and there are no obvious bends or dead angles during the winding of the auxiliary coil 2, which is beneficial for the installation of the auxiliary coil 2. The cross-section of the fixing groove 11 can be a rectangular structure, a trapezoidal structure, etc., and the trapezoidal structure can be a right-angled trapezoid or an isosceles trapezoid.

[0112] The attraction component 100 provided in this embodiment has an auxiliary coil 2 made of conductive material, specifically, the auxiliary coil 2 can be an electrical wire. The auxiliary coil 2 is used to replace the existing magnetic ring. In different AC four-way solenoid valves, the size parameters of the auxiliary coil 2 can be flexibly adjusted according to different size requirements. One auxiliary coil 2 can be used with different stationary iron cores 1. The structure of the auxiliary coil 2 has good adaptability and versatility.

[0113] In addition, since electromagnetic induction generates an induced current in the auxiliary coil 2, the induced current can generate an induced magnetic field. When the current is zero, there is still an electromagnetic attraction, which can overcome the vibration and noise generated when the electromagnetic attraction is zero.

[0114] For example, the auxiliary coil 2 is fixedly installed in the fixing groove 11 of the stationary iron core 1. Specifically, the auxiliary coil 2 is fixed to the stationary iron core 1 by an inlay assembly method, which can ensure the consistency of the dimensions of the stationary iron core 1 and the auxiliary coil 2, reduce the situation of dimensional errors between the stationary iron core 1 and the auxiliary coil 2 due to press fitting, and ensure the performance of the solenoid valve. At the same time, it can reduce the situation of detachment and failure of fit caused by repeated impact between the moving iron core 200 and the stationary iron core 1 during long-term operation, thereby improving the overall service life of the solenoid valve.

[0115] In one embodiment, when alternating magnetic flux passes through the auxiliary coil 2, an induced electromotive force (EMF) is generated in the auxiliary coil 2. If the auxiliary coil 2 is an arc-shaped segment, i.e., a half-turn structure with an opening, an EMF can only be generated in the half-turn of the auxiliary coil 2, resulting in uneven electromagnetic attraction. In another embodiment, the auxiliary coil 2 is a spiral shape with unconnected ends and has multiple turns, so that the auxiliary coil 2 as a whole has at least one complete coil. An induced EMF can be generated in the entire turn of the auxiliary coil 2, ensuring the uniformity of the generated electromagnetic attraction.

[0116] It should be noted that both the beginning and end of the auxiliary coil 2 are free ends, and the beginning and end of the auxiliary coil 2 do not need to be energized separately. Furthermore, the beginning and end of the auxiliary coil 2 cannot be connected to form a closed loop, otherwise a circuit will be formed, resulting in a short circuit.

[0117] Specifically, the multi-turn coil of the auxiliary coil 2 can be arranged along the axial direction of the stationary iron core 1; or, the multi-turn coil of the auxiliary coil 2 can be arranged along the radial direction of the stationary iron core 1; or, the multi-turn coil of the auxiliary coil 2 can be arranged along both the axial and radial directions of the stationary iron core 1.

[0118] For example, when winding the auxiliary coil 2, the coil can be first layered and wound along the inner wall of the fixed groove 11 and along the axial direction of the stationary iron core 1 to form an inner layer coil. Then, the coil can be layered and wound along the outer wall of the inner layer coil and along the axial direction of the stationary iron core 1 to form an intermediate layer or outer layer coil, thereby realizing the winding process first along the axial direction of the stationary iron core 1 and then along the radial direction of the stationary iron core 1. Alternatively, the coil can be wound along the radial direction of the stationary iron core 1 at the bottom of the fixed groove 11 to form a bottom layer coil. Then, the coil can be layered and wound along the axial direction of the stationary iron core 1 to form an intermediate layer coil, until the groove opening of the fixed groove 11 is reached to form an upper layer coil, thereby realizing the winding process first along the radial direction of the stationary iron core 1 and then along the axial direction of the stationary iron core 1. It is understood that this embodiment does not limit the winding direction of the auxiliary coil 2, and it can be adjusted according to the actual production situation.

[0119] like Figures 3-5 As shown, the width of the fixed slot 11 along the radial direction of the stationary iron core 1 is B, the depth of the fixed slot 11 along the axial direction of the stationary iron core 1 is H, the wire diameter of the auxiliary coil 2 is d, and the number of turns of the auxiliary coil 2 is N; where N*π(d / 2) 2 ≤B*H.

[0120] When the auxiliary coil 2 is directly wound in the fixed groove 11, if the size of the fixed groove 11 is relatively small, there will be difficulties in placing the auxiliary coil 2, and the auxiliary coil 2 is easily squeezed, resulting in a messy and unsightly arrangement.

[0121] To solve this problem, such as Figures 6-8 As shown, the attraction component 100 also includes a bracket 3, which is disposed in the fixing groove 11, and the auxiliary coil 2 is wound around the outside of the bracket 3.

[0122] During assembly, the auxiliary coil 2 is first wound around the outside of the bracket 3, and then the bracket 3 with the auxiliary coil 2 is placed in the fixing groove 11. The attraction assembly 100 is more modular, making it easier to install and replace the auxiliary coil 2, thereby reducing the operating cost of the solenoid valve; at the same time, the auxiliary coil 2 can be evenly wound on the bracket 3, with a neat and aesthetically pleasing arrangement, reducing the possibility of damage to the auxiliary coil 2 due to compression.

[0123] It is understandable that the dimensions of the bracket 3, auxiliary coil 2, and fixing slot 11 are compatible, and the sum of the cross-sectional areas of the bracket 3 and the auxiliary coil 2 is less than or equal to the cross-sectional area of ​​the fixing slot 11. If the number of turns, wire diameter, or other parameters of the auxiliary coil 2 are large, the thickness, height, and other dimensional parameters of the bracket 3 can be appropriately reduced, and the specific dimensions can be adjusted and changed according to actual production needs.

[0124] In one embodiment, such as Figures 8-9 As shown, the bracket 3 includes a fixing part 31, on which the auxiliary coil 2 is wound. The fixing part 31 is cylindrical or cylindrical in shape, facilitating the winding of the auxiliary coil 2. The fixing part 31 provides support for the auxiliary coil 2, achieving a better wire management effect and improving the aesthetics of the auxiliary coil 2. The stationary iron core 1 is coaxially arranged with the fixing part 31. This arrangement allows the auxiliary coil 2 and the stationary iron core 1 to be coaxially arranged, further improving the electromagnetic induction effect.

[0125] For example, the fixing part 31 contacts at least one groove wall of the fixing groove 11 in the radial direction of the stationary iron core 1. Positioning is achieved through the contact between the fixing part 31 and the fixing groove 11, so that the bracket 3 is fixed in position relative to the fixing groove 11, thereby ensuring the coaxiality between the stationary iron core 1 and the fixing part 31.

[0126] Specifically, the fixing groove 11 has a groove opening 111, an inner groove wall 112, an outer groove wall 113, and a groove bottom 114. The groove opening 111 is located on the upper end face, and the groove opening 111 and the groove bottom 114 are arranged opposite each other. Along the radial direction of the stationary iron core 1, the inner groove wall 112 is located inside the groove bottom 114, and the outer groove wall 113 is located outside the groove bottom 114. The inner groove wall 112, the groove bottom 114, and the outer groove wall 113 are connected in sequence. The fixing part 31 of the bracket 3 can contact the inner groove wall 112, and the inner diameter of the fixing part 31 is adapted to the size of the inner groove wall 112. The fixing part 31 of the bracket 3 can also contact the outer groove wall 113, and the outer diameter of the fixing part 31 is adapted to the size of the outer groove wall 113. Of course, in some other embodiments, the fixing part 31 of the bracket 3 can be a double-ring structure, which is adapted to the inner groove wall 112 and the outer groove wall 113 respectively.

[0127] If the auxiliary coil 2 has a large number of turns or a large wire diameter, the auxiliary coil 2 may protrude from the fixing groove 11. In this case, the moving iron core 200 will directly impact the auxiliary coil 2 as it moves closer to the stationary iron core 1, causing damage to the auxiliary coil 2 and affecting its service life.

[0128] Therefore, such as Figures 8-9 As shown, the bracket 3 also includes a limiting part 32, which is disposed at at least one end of the fixing part 31 along the axial direction of the stationary iron core 1. The limiting part 32 is used to limit the auxiliary coil 2.

[0129] Specifically, along the axial direction of the stationary iron core 1, the limiting part 32 can be disposed at the end of the fixing part 31 facing the moving iron core 200, that is, the limiting part 32 is located at the upper end of the fixing part 31. The limiting part 32 covers the slot 111 of the fixing groove 11, realizing the axial limiting function of the auxiliary coil 2, and to a certain extent playing the role of pressing down and clamping the auxiliary coil 2, avoiding the situation where the auxiliary coil 2 is too large and protrudes from the upper end surface, so as to reduce the impact of the moving iron core 200 on the auxiliary coil 2 and extend the service life of the auxiliary coil 2. In addition, the limiting part 32 realizes the isolation between the auxiliary coil 2 and the moving iron core 200. Even if the solenoid valve is impacted in the energized position during operation, the moving iron core 200 and the auxiliary coil 2 will not directly contact each other, further improving the service life of the auxiliary coil 2.

[0130] For example, a limiting part 32 is provided at one end of the fixing part 31 facing the opening 111 of the fixing groove 11. The limiting part 32 has an isolating and protective function for the auxiliary coil 2 in the fixing groove 11, and also achieves a shielding function to a certain extent, so as to prevent impurities from entering the fixing groove 11 before plastic sealing, thus ensuring the fixing effect.

[0131] In some other embodiments, along the axial direction of the stationary iron core 1, the limiting part 32 can be disposed at the end of the fixing part 31 away from the moving iron core 200, that is, the limiting part 32 is located at the lower end of the fixing part 31, and the limiting part 32 is in contact with the bottom 114 of the fixing groove 11. The limiting part 32 realizes the axial limiting of the auxiliary coil 2, and the limiting part 32 also plays a role in supporting the auxiliary coil 2 to a certain extent, so that the limiting part 32 can be placed into the fixing groove 11 as a whole or taken out of the fixing groove 11 after carrying the auxiliary coil 2, which is beneficial to the replacement and assembly of the auxiliary coil 2.

[0132] It is understood that the number of fixing parts 31 and limiting parts 32 provided in this embodiment is at least one. Depending on the different numbers of fixing parts 31 and limiting parts 32, and the different relative positions between the fixing parts 31 and limiting parts 32, the bracket 3 can have different forms. The bracket 3 includes, but is not limited to, the structure provided in this embodiment. For example, the bracket 3 may have one fixing part 31 and one limiting part 32, and the cross-section of the bracket 3 is L-shaped or inverted L-shaped; the bracket 3 may have two fixing parts 31 and one limiting part 32, and the cross-section of the bracket 3 is concave or inverted concave; the bracket 3 may also have two fixing parts 31 and two limiting parts 32, and the cross-section of the bracket 3 is a rectangular ring structure. Of course, the number of fixing parts 31 and limiting parts can also be other numbers, with multiple fixing parts 31 arranged in parallel and / or multiple limiting parts 32 arranged in parallel and at intervals to isolate the auxiliary coils 2 of different layers.

[0133] In one embodiment, a gap is provided between the limiting part 32 and at least one groove wall of the fixing groove 11 along the radial direction of the stationary iron core 1. This gap facilitates the insertion of the limiting part 32 and the auxiliary coil 2 into the fixing groove 11.

[0134] While the aforementioned gaps facilitate installation and disassembly, they may cause rattling noises due to impact during engagement. To address this issue, the attraction assembly 100 also includes a retaining adhesive (not shown in the figure), which fills the gaps between the retaining groove 11, the auxiliary coil 2, and the bracket 3. The adhesive fills the gaps between these components, preventing the auxiliary coil 2 and the bracket 3 from shifting relative to the retaining groove 11, thus improving the fixation effect and reducing noise from vibration and rattling, thereby enhancing the overall performance.

[0135] It is understandable that the gap between the limiting part 32 and the fixing groove 11 can facilitate the entry of the fixing adhesive into the fixing groove 11.

[0136] It is understandable that if only the auxiliary coil 2 is installed in the fixing groove 11 and no bracket 3 is installed, the fixing adhesive is filled between the auxiliary coil 3 and the fixing groove 11. The fixing adhesive can fill the gap between the fixing groove 11 and the auxiliary coil 2, so that the auxiliary coil 2 will not move relative to the fixing groove 11.

[0137] It should be noted that the impact generated during the closure of the existing four-way valve directly acts on the entire magnetic ring. While the magnetic ring uses an interference fit for fixing, this rigid structure is more prone to detachment and damage to components. Therefore, the fixing adhesive provided in this application is a type of adhesive. For example, epoxy resin can be used. The auxiliary coil 2 is fixed using adhesive, which ensures both overall mechanical strength and positional stability of the auxiliary coil 2, reducing relative displacement between the auxiliary coil 2 and the fixing groove 11. Furthermore, the adhesive is actually a flexible structure, making it less susceptible to damage from impacts and extending its service life.

[0138] In one embodiment, the projections of the auxiliary coil 2 and the fixing adhesive onto the reference plane are located inside the projection of the fixing groove 11 onto the reference plane; wherein, the reference plane is parallel to the axial direction of the stationary iron core 1.

[0139] In this manner, when the attraction component 100 attracts the moving iron core 200, a gap is provided between the top surface of the auxiliary coil 2 and the end face of the moving iron core 1 facing the attraction component 100. Because there is a certain distance between the end faces of the auxiliary coil 2 and the moving iron core 1, even if they are impacted at the attraction position, the moving iron core 1 and the auxiliary coil 2 will not come into direct contact, thus extending the service life of the auxiliary coil 2.

[0140] like Figure 10The diagram shows a simulation of the electromagnetic force changing over time in the activated position of a conventional solenoid valve. The horizontal axis represents time, and the vertical axis represents the electromagnetic force. The minimum electromagnetic force is 5.62 N, which is the value at the zero-crossing point on the electromagnetic force-time distribution curve. According to the design requirements of the reset element 700, its elastic force is the sum of its design value and safety margin; for example, the elastic force of the reset element 700 is approximately 3 N. The electromagnetic force of the existing solenoid valve, 5.62 N, far exceeds the 3 N elastic force required to overcome in the activated position. The magnetic ring can meet the requirements with a considerable margin, meaning the thickness of the magnetic ring can be reduced. However, reducing the thickness of the magnetic ring would compromise its strength after multiple activations, affecting its performance.

[0141] Figure 11 The diagram shows a simulation of the electromagnetic force of the solenoid valve of the present invention changing over time at the engaged position. The minimum electromagnetic force of this application is 3.25N, which is the value at the zero-crossing point of the electromagnetic force distribution curve over time, just exceeding the 3N elastic force required to overcome the reset element 700 at the engaged position. Based on the required electromagnetic force, the structural dimensional parameters such as the wire diameter and number of turns of the auxiliary coil 2 are calculated using theoretical calculation methods to meet the performance parameters required by the directional valve under different operating conditions, thus enabling the directional valve to have good controllability. In addition, in different AC four-way directional valves, the dimensional parameters of the auxiliary coil 2 can be flexibly adjusted according to different magnetic ring sizes, allowing one auxiliary coil 2 to be used with different sizes and types of stationary iron cores 1, giving the directional valve good adaptability and versatility.

[0142] It is understood that the attraction component 100 provided in this embodiment, by setting the auxiliary coil 2, can not only have the effect of a magnetic ring, but also integrate and install functions such as temperature sensor and Hall sensor according to the actual use scenario, so as to realize the integration of other functions such as temperature monitoring and position detection, and further improve intelligence.

[0143] This embodiment also provides a method for manufacturing an attraction component, used to manufacture the attraction component 100 described above. The method for manufacturing the attraction component includes the following steps:

[0144] A fixing groove 11 is formed on the end face of the stationary iron core 1 facing the moving iron core 200;

[0145] Place the auxiliary coil 2 in the fixed slot 11.

[0146] The manufacturing method of the attraction component provided in this embodiment reduces the amount of copper used compared to the existing method using a magnetic separator ring, thereby lowering costs. Replacing the magnetic separator ring with the auxiliary coil 2 allows for the direct use of existing slot structures for accommodating the magnetic separator ring, resulting in lower modification costs. Furthermore, placing the auxiliary coil 2 within the fixing slot 11 creates a certain distance between the top surface of the auxiliary coil 2 and the end face of the moving iron core 200. Even when impacted at the attraction position, the moving iron core 200 and the auxiliary coil 2 will not directly contact each other, extending the service life of the auxiliary coil 2.

[0147] The following steps are included before the auxiliary coil 2 is placed in the fixing slot 11:

[0148] The number of turns and wire diameter of auxiliary coil 2 were determined through calculation;

[0149] The auxiliary coil 2 is wound around the bracket 3;

[0150] Place the bracket 3 with the auxiliary coil 2 into the fixing slot 11.

[0151] Specifically, epoxy resin can be used as the fixing adhesive. The auxiliary coil 2 is wound around the bracket 3, which essentially acts as a coil holder, providing support for the auxiliary coil 2. The auxiliary coil 2 is fixed to the bracket 3 with the fixing adhesive, which not only fixes the auxiliary coil 2 but also encapsulates it, effectively isolating and protecting it. Using this method, the auxiliary coil 2 and the bracket 3 can be placed as a whole in the fixing groove 11. This modular design facilitates the replacement or upgrading of the auxiliary coil 2 to adapt to different application needs. Furthermore, the easy-to-maintain and replaceable structure of the auxiliary coil 2 improves maintenance simplicity and reduces maintenance time and costs.

[0152] In one embodiment, the following steps are included before placing the bracket 3 with the auxiliary coil 2 into the fixing slot 11:

[0153] A fixing adhesive is applied between the auxiliary coil 2 and the bracket 3 and then cured.

[0154] In this way, the auxiliary coil 2 is fixed to the bracket 3 with adhesive, which effectively fixes the auxiliary coil 2 to the bracket 3 and prevents the auxiliary coil 2 from coming apart.

[0155] The curing temperature of the fixing adhesive is 40℃~60℃, for example, 40℃, 50℃, or 60℃. The curing time of the fixing adhesive is 1.5h~2.5h, for example, 1.5h, 2h, or 2.5h. It is understood that the curing temperature and curing time of the fixing adhesive can be adjusted according to actual production conditions, as long as the fixing and encapsulation of the auxiliary coil 2 can be achieved, which is within the protection scope of this embodiment.

[0156] In one embodiment, after placing the auxiliary coil 2 into the fixing slot 11, the following steps are also included:

[0157] Fill the gap between the auxiliary coil 2 and the fixing groove 11 with the fixing adhesive and let it cure.

[0158] Specifically, the fixing adhesive can be epoxy resin. Epoxy resin is injected through the gap between the bracket 3 and the fixing groove 11 to encapsulate the bracket 3 and the auxiliary coil 2. This ensures both overall mechanical strength and positional stability of the auxiliary coil 2, reducing relative displacement between the auxiliary coil 2 and other components. Furthermore, the fixing adhesive is a flexible structure, making it less susceptible to damage from impacts and extending its service life.

[0159] In one embodiment, the curing temperature of the fixing adhesive is 40℃ to 60℃, for example, 40℃, 50℃, or 60℃. The curing time of the fixing adhesive is 1.5h to 2.5h, for example, 1.5h, 2h, or 2.5h. It is understood that the curing temperature and curing time of the fixing adhesive can be adjusted according to actual production conditions, as long as the fixing and encapsulation of the auxiliary coil 2 can be achieved, it is within the protection scope of this embodiment.

[0160] It should be noted that the existing magnetic separator ring is a monolithic structure made of copper. Since copper itself possesses a certain degree of mechanical strength and stability, it can resist the influence of the external environment to some extent, thus the magnetic separator ring does not require encapsulation. Furthermore, the main function of the magnetic separator ring is to adjust the magnetic field distribution and reduce the vibration and noise of the AC four-way valve under AC current; it does not involve electrical insulation or protection requirements, therefore no additional plastic sealing is necessary.

[0161] The manufacturing method of the attraction component provided in this embodiment adopts the assembly method of embedding the auxiliary coil 2. The auxiliary coil 2 with a determined number of turns and wire diameter is wound on the bracket 3. After being sealed and fixed on the bracket 3 with fixing glue, the auxiliary coil 2 and the bracket 3 are placed in the fixing groove 11 as a whole and glued to the fixing groove 11 as a whole with fixing glue. This ensures the overall mechanical strength and the positional stability of the auxiliary coil 2, and reduces the relative displacement of the auxiliary coil 2 relative to the fixing groove 11.

[0162] This disclosure provides a method for determining the size information of an auxiliary coil, which can be applied to the auxiliary coils in the above embodiments.

[0163] Figure 12 This diagram illustrates a method for determining the size information of an auxiliary coil according to an embodiment of the present disclosure. Figure 12As shown, the method may include the following steps:

[0164] S1202, determine the total magnetic flux to be provided by the auxiliary coil based on the electromagnetic force to be provided;

[0165] S1204, through multiple iterations, sets the position of the fixed slot on the stationary iron core, determines the first magnetic flux and the second magnetic flux that the auxiliary coil can provide, until the first area and the second area that can provide the total magnetic flux are obtained. The first area is the area on the first end face outside the fixed slot, the second area is the area on the first end face inside the fixed slot, the first magnetic flux is the magnetic flux provided by the first area, the second magnetic flux is the magnetic flux provided by the second area, and the direction of the first magnetic flux is opposite to the direction of the second magnetic flux.

[0166] S1206 sets the estimated resistance value of the auxiliary coil through multiple iterations, determines the number of turns of the auxiliary coil based on the first area and the second area, and compares it with the specification information of the selected coil material to determine the size information of the auxiliary coil that meets the conditions.

[0167] It should be noted that, in this embodiment, the auxiliary coil is disposed in a fixed groove on the end face of the stationary iron core facing the moving iron core, forming an attraction assembly with the stationary iron core to provide electromagnetic force for attracting or releasing the moving iron core. Therefore, to meet the electromagnetic force required by the auxiliary coil under different operating conditions, after determining the size information of the auxiliary coil, the total magnetic flux to be provided by the auxiliary coil can be determined first based on the electromagnetic force to be provided.

[0168] After determining the first and second areas that can provide the required total magnetic flux, the optimal size information of the auxiliary coil 2 can be given by theoretical calculation (the size information includes, but is not limited to, the number of coil turns and wire diameter).

[0169] In one embodiment, such as Figure 13 As shown, the method for determining the auxiliary coil size information through iteration includes the following steps:

[0170] S1302, Set the position of the fixing slot on the stationary iron core;

[0171] S1304, based on the position of the fixing groove on the first end face, determine the first area and the second area on the first end face, wherein the first area is the area on the first end face outside the fixing groove, and the second area is the area on the first end face inside the fixing groove;

[0172] S1306, determine the first magnetic flux that the auxiliary coil can provide based on the first area; determine the second magnetic flux that the auxiliary coil can provide based on the second area;

[0173] S1308, based on the first magnetic flux and the second magnetic flux that the auxiliary coil can provide, determine whether the first area and the second area on the first end face satisfy the total magnetic flux;

[0174] S1310, if not, repeat the above steps;

[0175] If S1312 is correct, then stop the iteration.

[0176] It should be noted that since the auxiliary coil is located within a fixed slot, the total magnetic flux provided by the auxiliary coil will vary depending on the position of the fixed slot on the stationary iron core. In this embodiment, by assuming the position of the fixed slot on the stationary iron core, a first area outside the fixed slot and a second area inside the fixed slot are calculated. Since there is a certain relationship between magnetic flux and area, a first magnetic flux in a first direction can be determined based on the first area, and a second magnetic flux in a second direction can be determined based on the second magnetic flux. Finally, the total magnetic flux provided by the auxiliary coil is calculated based on the first and second magnetic fluxes, and it is determined whether the total magnetic flux provided by the auxiliary coil meets the total magnetic flux required for the auxiliary coil to provide the electromagnetic force. If the total magnetic flux provided by the auxiliary coil is greater than or equal to the total magnetic flux of the electromagnetic force required by the auxiliary coil, then the assumed fixed slot position is determined to be suitable (i.e., the first area and the second area satisfy the total magnetic flux), and the iteration stops; conversely, if the total magnetic flux provided by the auxiliary coil is less than the total magnetic flux of the electromagnetic force required by the auxiliary coil, then the assumed fixed slot position is determined to be unsuitable (i.e., the first area and the second area do not satisfy the total magnetic flux), then the fixed slot position is re-assumed, and the above steps S1302 to S1308 are repeated until the first area and the second area that can satisfy the required total magnetic flux are obtained.

[0177] like Figures 3-5 As shown, the different positions of the fixed slot 11 on the stationary iron core 1 will affect the total magnetic flux provided by the auxiliary coil 2. In this embodiment, the position of the fixed slot 11 on the stationary iron core 1 is set by multiple iterations, and the first magnetic flux Φ1 and the second magnetic flux Φ2 that the auxiliary coil 2 can provide are determined until a first area S1 and a second area S2 that can provide the required total magnetic flux Φ are obtained. The first area S1 is the area on the first end face located outside the fixed slot 11, and the second area S2 is the area on the first end face located inside the fixed slot 11. The first magnetic flux Φ1 is the magnetic flux provided by the first area S1, and the second magnetic flux Φ2 is the magnetic flux provided by the second area S2. The direction of the first magnetic flux Φ1 is opposite to the direction of the second magnetic flux Φ2. Therefore, the total magnetic flux provided by the auxiliary coil 2 is Φ=|Φ1-Φ2|.

[0178] In practical implementation, the first and second magnetic fluxes can be calculated using, but are not limited to, the following formulas:

[0179] Φ1=I·N·G Z1 (1)

[0180] Φ2=I·N·G Z2 (2)

[0181] in,

[0182]

[0183] Where Φ1 represents the first magnetic flux; Φ2 represents the second magnetic flux; I represents the induced current; N represents the number of coil turns; G Z1 G represents the magnetic permeability corresponding to the first area S1; Z2 S1 represents the magnetic permeability corresponding to the second area S2; S2 represents the area on the first end face of the stationary iron core outside the fixed slot; μ0 represents the air permeability; δ represents the gap through which the magnetic circuit flows.

[0184] It should be noted that the induced current can be obtained through measurement. In an AC system, the induced current is expressed as follows:

[0185]

[0186] The magnetic flux generated by the coil is a sinusoidal or cosine function that varies with time. The magnetic flux generated by the main coil is a unidirectional magnetic flux, while the magnetic flux generated by the auxiliary coil is in opposite directions at points S1 and S2.

[0187] The electromagnetic force (attractive force) required by the auxiliary coil is:

[0188]

[0189] Accordingly, the total magnetic flux required by the auxiliary coil is:

[0190] Φ=|Φ1-Φ2| (7)

[0191] In this embodiment, an auxiliary coil is used to replace the magnetic ring in the attractor assembly of a solenoid valve (such as a four-way directional valve). The required attraction force is achieved by the total magnetic flux generated by the main and auxiliary coils on S1 and S2. To meet the performance parameters required by the four-way directional valve under different operating conditions, it is necessary to accurately determine the number of turns, wire diameter, and dimensions of the auxiliary coil through theoretical calculations as a reference. This allows the auxiliary coil with the determined number of turns and wire diameter to be wound into the fixing groove of the attractor assembly and then encapsulated with epoxy resin.

[0192] In one embodiment, such as Figure 14 As shown, the method for determining the auxiliary coil size information through iteration includes the following steps:

[0193] S1402, Set the estimated resistance value of the auxiliary coil;

[0194] S1404, Based on the first area, the second area, and the estimated resistance value of the auxiliary coil, determine the estimated number of turns of the auxiliary coil;

[0195] S1406, compare the estimated resistance and the estimated number of turns of the auxiliary coil with the actual resistance and the actual number of turns of the auxiliary coil, wherein the actual resistance and the actual number of turns of the auxiliary coil are determined based on the specifications of the selected coil material;

[0196] S1408, Based on the comparison results, determine whether the size information of the auxiliary coil meets the conditions;

[0197] S1410, If not, repeat the above steps;

[0198] If S1412 is correct, then stop the iteration.

[0199] It should be noted that the number of turns of the coil determines the length of the coil, and the length of the coil is related to the resistance of the coil. In this embodiment, by assuming an estimated resistance value for an auxiliary coil, and then calculating the number of turns of the auxiliary coil based on the first and second areas of the auxiliary coil that provide the required total magnetic flux, the theoretically calculated number of turns is compared with the specifications of the selected coil material (for example, when the auxiliary coil uses enameled wire, the relevant information can be obtained by consulting the national standard enameled wire GB6109). Finally, the comparison result determines whether the size information of the auxiliary coil conforms to the actual situation (i.e., meets the conditions). If it does not conform (i.e., the size information of the auxiliary coil does not meet the conditions), the estimated resistance value of the auxiliary coil is re-assumed, and the above steps S1402 to S1408 are repeated until the first and second areas that can meet the required total magnetic flux are obtained; if it conforms (i.e., the size information of the auxiliary coil meets the conditions), the iteration stops.

[0200] Specifically, when comparing the estimated resistance and number of turns of the auxiliary coil with the actual resistance and number of turns of the auxiliary coil, it can be done in any of the following ways, but is not limited to:

[0201] 1) By estimating the resistance of the auxiliary coil, look up the coil length corresponding to the corresponding resistance (the difference in resistance value does not exceed the preset resistance value), calculate the actual number of coil turns corresponding to the coil length, and then compare the estimated number of coil turns of the auxiliary coil with the actual number of coil turns. If the difference between the estimated number of coil turns and the actual number of coil turns is within the preset coil turn error range, then determine whether the size information of the auxiliary coil meets the conditions.

[0202] 2) Calculate the corresponding coil length based on the estimated number of coil turns, query the actual resistance value corresponding to the corresponding coil length (the difference in coil length does not exceed the preset length value), and then compare the estimated resistance value of the auxiliary coil with the actual resistance value obtained from the query. If the estimated resistance value of the auxiliary coil and the actual resistance value obtained from the query are within the preset resistance value error range, then determine whether the size information of the auxiliary coil meets the conditions.

[0203] 3) Compare the estimated resistance value of the auxiliary coil with the actual resistance value obtained from the query. Calculate the corresponding coil length based on the estimated number of turns of the auxiliary coil and compare it with the coil length obtained from the query. If the difference in resistance value and the difference in coil length do not exceed the corresponding preset threshold, then determine whether the size information of the auxiliary coil meets the conditions.

[0204] It should be noted that, in actual implementation, the method for determining whether the size information of the auxiliary coil meets the conditions can be, but is not limited to, the three methods mentioned above. Those skilled in the art can choose different comparison methods according to the actual situation (such as different information actually found).

[0205] It should be noted that manually setting the resistance estimate of the auxiliary coil randomly may require many iterations to obtain the dimensional information that meets the requirements. In one embodiment, the resistance estimate of the auxiliary coil can be calculated using the following formula:

[0206]

[0207] in,

[0208] w=2πf (9)

[0209] Where R represents the estimated resistance of the auxiliary coil; w represents the angular frequency of the driving power supply; μ0 represents the permeability of air; S1 represents the area on the first end face of the stationary iron core outside the fixed slot; S2 represents the area on the first end face of the stationary iron core inside the fixed slot; and f represents the frequency of the driving power supply.

[0210] In one embodiment, the method for determining the size information of the auxiliary coil provided in this disclosure can further determine the estimated number of turns of the auxiliary coil based on the first area, the second area, and the estimated resistance value of the auxiliary coil through the following steps: determining the induced electromotive force of the auxiliary coil; calculating the induced current of the auxiliary coil based on the induced electromotive force and the estimated resistance value of the auxiliary coil; and calculating the estimated number of turns of the auxiliary coil using the following formula:

[0211] Φ=I·N·G Z (10)

[0212] in,

[0213]

[0214] Where Φ represents magnetic flux; I represents induced current; N represents the number of coil turns; G Z μ0 represents the permeability of the magnetic circuit; S represents the area through which the magnetic circuit flows; S represents the gap through which the magnetic circuit flows.

[0215] The induced electromotive force of the auxiliary coil can be determined based on the induced electromotive force of the main coil of the solenoid valve.

[0216] In one embodiment, the method for determining the size information of the auxiliary coil provided in this disclosure can determine the actual resistance value and the actual number of turns of the auxiliary coil using the following formula:

[0217]

[0218] Where R represents the resistance of the auxiliary coil; ρ represents the resistivity of the auxiliary coil; l cs q represents the total length of the auxiliary coil; s N represents the cross-sectional area of ​​the selected coil material; a The number of turns of the auxiliary coil is indicated; r1 represents the inner diameter of the auxiliary coil mounting position; r2 represents the outer diameter of the auxiliary coil mounting position; δ4 represents the height of the auxiliary coil; d a This indicates the wire diameter of the selected coil material.

[0219] Figure 15 A schematic diagram showing the dimensions of an auxiliary coil is provided. The value of δ can be either |δ2-δ1| or |δ3-δ4|. Where |δ2-δ1|=|δ3-δ4|.

[0220] Figure 16 A vector diagram illustrating the principle of an auxiliary coil structure is shown, such as... Figure 16 As shown, when the alternating magnetic flux passes through the auxiliary coil, an electromotive force E2 is induced in the auxiliary coil, thus generating an induced current I0. Under the action of current I0, another magnetic flux is generated, and the direction of this magnetic flux is opposite to Φ2 according to Lenz's law, as shown below. Figure 15As shown. Therefore, the magnetic flux flowing through the area S2 wrapped by the auxiliary coil is the difference (vector difference) between the two magnetic fluxes, while the magnetic flux flowing through the area S1 not wrapped is the vector sum of the two magnetic fluxes. Thus, due to the presence of the auxiliary coil, Φ1 and Φ2 always have a phase angle difference in time, and the attractive force generated by this magnetic flux also has a phase angle difference in time. When these two attractive forces with a phase angle difference in time act together on the moving iron core, the attractive force generated by magnetic flux Φ1 reaches zero at any instant, while the attractive force generated by Φ2 is not equal to zero. Due to the alternating action of the two magnetic fluxes Φ1 and Φ2, at any given instant, the total attractive force on the moving iron core will not be equal to zero, thus potentially eliminating the vibration of the moving iron core.

[0221] The induced electromotive force (EMF) of the auxiliary coil can be determined based on the induced EMF of the main coil, which is expressed as follows:

[0222]

[0223] Among them, E ′ The induced electromotive force of the main coil is represented by ΔΦ; the rate of change of magnetic flux per unit time Δt is represented by N. ′ This indicates the number of turns in the main coil.

[0224] As can be seen from the above, the method of theoretically calculating the auxiliary coil size information in this embodiment can determine the required total magnetic flux vector based on the magnitude of the required electromagnetic force; based on the position of the fixed slot or by assuming the dimensions of S1 and S2 in the new design, the corresponding magnetic permeability G can be calculated. Z1 and G Z2 Regarding the assumptions about S1 and S2, any S1 and S2 may not satisfy the minimum total magnetic flux. Therefore, the assumptions about S1 and S2 also require multi-step iterative calculation. Further, the induced electromotive force E in the auxiliary coil is calculated based on the excitation supplied to the main coil (the ratio of induced electromotive forces is equal to the ratio of the number of coil turns). Assuming the resistance R of the auxiliary coil, the current in the auxiliary coil can be calculated from the induced electromotive force E in the auxiliary coil, and then the number of turns of the auxiliary coil can be calculated according to formula (10). If the auxiliary coil uses enameled wire, an enameled wire specification can be selected according to the international standard for enameled wire, and then the number of turns of the enameled wire can be calculated according to formula (12) and formula (13). This number of turns is compared with that in step 4, and then iterative calculation is performed continuously until a result that meets the requirements is found.

[0225] In practical implementation, it is important to note that when calculating the number of turns of the auxiliary coil, the result can be rounded down (because the number of turns is an integer and the coil placement position cannot exceed the fixed slot).

[0226] In this embodiment, a coil, a conductive material, is used to replace the magnetic ring in existing solenoid valves. The number of turns, wire diameter, and dimensions of the auxiliary coil can be precisely calculated using theoretical methods as a reference, meeting the performance parameters required by the four-way directional valve under different operating conditions and providing good controllability. The auxiliary coil adopts an embedded assembly method, ensuring the consistency of the attractor and auxiliary coil dimensions, avoiding dimensional errors caused by press-fitting in existing assembly methods, thus guaranteeing valve body performance. Furthermore, this fit will not detach (i.e., fail) due to long-term impact between the moving iron core and the attractor during operation, thereby improving the overall component lifespan. Even if the sealant on the auxiliary coil detaches and performance deteriorates, this installation method is more modular and easy to replace, reducing the valve body's operating cost. The auxiliary coil provided in this embodiment has good adaptability and versatility. In different AC four-way directional valves, the coil's dimensions can be flexibly adjusted according to different magnetic ring sizes, allowing one auxiliary coil to be used with different attractors.

[0227] It should be noted that the embodiments of the present invention shown in the drawings and described in this specification are merely one example employing the principles of the invention. Those skilled in the art will clearly understand that the principles of the invention are not limited to any details or components of the apparatus shown in the drawings or described in the specification.

[0228] It should be understood that the application of this invention is not limited to the detailed structure and arrangement of the components presented in this specification. The invention can have other embodiments and can be implemented and performed in various ways. The foregoing variations and modifications fall within the scope of this invention. It should be understood that the invention disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of the invention. The embodiments described in this specification illustrate the best known mode for carrying out the invention and will enable those skilled in the art to utilize the invention.

[0229] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered as exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

[0230] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. An attraction component, characterized in that, include: A stationary iron core, wherein a fixing groove is provided on the end face of the stationary iron core facing the moving iron core; An auxiliary coil is disposed within the fixing slot; The auxiliary coil is made of conductive material and is configured as an arc-shaped segment with no connection between its beginning and end. Alternatively, the auxiliary coil can be configured as a spiral shape with the beginning and end not connected.

2. The attraction component according to claim 1, characterized in that, When the auxiliary coil is configured as a spiral with no connection between the beginning and end, the auxiliary coil has multiple turns.

3. The attraction component according to claim 1, characterized in that, Also includes: A bracket is disposed within the fixed groove, and the auxiliary coil is wound around the bracket.

4. The attraction component according to claim 3, characterized in that, The support includes: The auxiliary coil is wound around the fixing part; A limiting part is disposed at at least one end of the fixing part along the axial direction of the stationary iron core, and the limiting part is used to limit the auxiliary coil.

5. The attraction component according to claim 4, characterized in that, The limiting part is provided at one end of the fixing part facing the opening of the fixing groove.

6. The attraction component according to claim 4, characterized in that, A gap is provided between the limiting part and at least one groove wall of the fixing groove along the radial direction of the stationary iron core.

7. The attraction component according to claim 4, characterized in that, The fixing part is columnar or cylindrical, and the stationary iron core is coaxially arranged with the fixing part.

8. The attraction component according to claim 3, characterized in that, The bracket is in contact with at least one groove wall of the fixing groove along the radial direction of the stationary iron core.

9. The attraction component according to claim 2, characterized in that, Also includes: A fixing adhesive is filled into the fixing groove to fix the auxiliary coil.

10. The attraction component according to claim 9, characterized in that, The projections of the auxiliary coil and the fixing adhesive onto the reference plane are located inside the projection of the fixing groove onto the reference plane; The reference plane is parallel to the axial direction of the stationary iron core.

11. A method for manufacturing an attraction component, characterized in that, A method for manufacturing an attraction component according to any one of claims 1-10, the method comprising the following steps: A fixing groove is made on the end face of the stationary iron core facing the moving iron core; Place the auxiliary coil in the fixed slot.

12. The method for manufacturing the attraction component according to claim 11, characterized in that, The following steps are included before the auxiliary coil is placed in the fixing slot: The auxiliary coil is wound onto the bracket; Place the bracket with the auxiliary coil into the fixing slot.

13. The method for manufacturing the attraction component according to claim 12, characterized in that, The following steps are included before placing the bracket with the auxiliary coil into the fixing slot: A fixing adhesive is applied between the auxiliary coil and the bracket and then cured.

14. The method for manufacturing the attraction component according to claim 12, characterized in that, After the auxiliary coil is placed in the fixing slot, the following steps are also included: Fill the gap between the auxiliary coil and the fixing groove with the fixing adhesive and let it cure.

15. The method for manufacturing the attraction component according to claim 13 or 14, characterized in that, The curing temperature of the fixative is 40℃~60℃, and the curing time of the fixative is 1.5h~2.5h.

16. A solenoid valve, characterized in that, The device includes a moving iron core, a valve sleeve, a coil, and an attraction assembly as described in any one of claims 1 to 10, wherein the moving iron core and the attraction assembly are disposed within the valve sleeve, the coil is sleeved outside the valve sleeve, and the attraction assembly is configured to generate magnetic force and attract or release the moving iron core, causing the moving iron core to slide relative to the valve sleeve.

17. A method for determining the size information of an auxiliary coil, characterized in that, The auxiliary coil includes at least one turn of coil, which is disposed in a fixed slot on the stationary iron core. The fixed slot is disposed on a first end face of the stationary iron core facing the moving iron core. The stationary iron core and the auxiliary coil constitute an attraction assembly to provide an electromagnetic force for attracting or releasing the moving iron core. The method includes: The total magnetic flux to be provided by the auxiliary coil is determined based on the electromagnetic force to be provided. By iterating multiple times, the position of the fixed slot on the stationary iron core is set, and the first magnetic flux and the second magnetic flux that the auxiliary coil can provide are determined until the first area and the second area that can provide the total magnetic flux are obtained. The first area is the area on the first end face outside the fixed slot, the second area is the area on the first end face inside the fixed slot, the first magnetic flux is the magnetic flux provided by the first area, the second magnetic flux is the magnetic flux provided by the second area, and the direction of the first magnetic flux is opposite to the direction of the second magnetic flux. By iterating multiple times, the resistance estimate of the auxiliary coil is set, the number of turns of the auxiliary coil is determined based on the first area and the second area, and the result is compared with the specification information of the selected coil material to determine the size information of the auxiliary coil that meets the conditions.

18. The method for determining the size information of the auxiliary coil according to claim 17, characterized in that, By iteratively setting the position of the fixed slot on the stationary iron core, determining the first and second magnetic flux provided by the auxiliary coil, until a first and second area that can provide the total magnetic flux are obtained, including: The position of the fixing groove on the stationary iron core is set; Based on the position of the fixing groove on the first end face, determine the first area and the second area on the first end face; The first magnetic flux that the auxiliary coil can provide is determined based on the first area; the second magnetic flux that the auxiliary coil can provide is determined based on the second area. Based on the first and second magnetic flux provided by the auxiliary coil, determine whether the first and second areas on the first end face satisfy the total magnetic flux. If not, repeat the above steps; If so, then stop iterating.

19. The method for determining the size information of the auxiliary coil according to claim 18, characterized in that, The first magnetic flux and the second magnetic flux are calculated using the following formulas: Φ1=I·N·G Z1 ; Φ2=I·N·G Z2 ; in, Where Φ1 represents the first magnetic flux; Φ2 represents the second magnetic flux; I represents the induced current; N represents the number of coil turns; G Z1 G represents the magnetic permeability corresponding to the first area S1; Z2 S1 represents the magnetic permeability corresponding to the second area S2; S2 represents the area on the first end face of the stationary iron core outside the fixed slot; μ0 represents the air permeability; δ represents the gap through which the magnetic circuit flows.

20. The method for determining the size information of the auxiliary coil according to claim 17, characterized in that, By iteratively setting the estimated resistance value of the auxiliary coil, determining the number of turns of the auxiliary coil based on the first area and the second area, and comparing it with the specifications of the selected coil material, the dimensional information of the auxiliary coil that meets the conditions is determined, including: Set the estimated resistance value of the auxiliary coil; Based on the first area, the second area, and the estimated resistance value of the auxiliary coil, determine the estimated number of turns of the auxiliary coil; The estimated resistance and the estimated number of turns of the auxiliary coil are compared with the actual resistance and the actual number of turns of the auxiliary coil, wherein the actual resistance and the actual number of turns of the auxiliary coil are determined based on the specifications of the selected coil material. Based on the comparison results, determine whether the size information of the auxiliary coil meets the requirements; If not, repeat the above steps; If so, then stop iterating.

21. The method for determining the size information of the auxiliary coil according to claim 20, characterized in that, The estimated resistance of the auxiliary coil is calculated using the following formula: Where w = 2πf; Where R represents the estimated resistance of the auxiliary coil; w represents the angular frequency of the driving power supply; μ0 represents the permeability of air; S1 represents the area on the first end face of the stationary iron core outside the fixed slot; S2 represents the area on the first end face of the stationary iron core inside the fixed slot; and f represents the frequency of the driving power supply.

22. The method for determining the size information of the auxiliary coil according to claim 20, characterized in that, Based on the first area, the second area, and the estimated resistance value of the auxiliary coil, the estimated number of turns of the auxiliary coil is determined, including: Determine the induced electromotive force of the auxiliary coil; Calculate the induced current in the auxiliary coil based on the estimated values ​​of the induced electromotive force and resistance of the auxiliary coil. The estimated number of turns of the auxiliary coil is calculated using the following formula: Φ=I·N·G Z ; in, Where Φ represents magnetic flux; I represents induced current; N represents the number of coil turns; G Z δ represents the magnetic permeability in the magnetic circuit; μ0 represents the air permeability; S represents the area through which the magnetic flow passes; δ represents the gap through which the magnetic flow passes.

23. The method for determining the size information of the auxiliary coil according to claim 22, characterized in that, The induced electromotive force of the auxiliary coil is determined based on the induced electromotive force of the main coil of the solenoid valve.

24. The method for determining the size information of the auxiliary coil according to claim 20, characterized in that, The actual resistance and actual number of turns of the auxiliary coil are determined using the following formulas: Where R represents the resistance of the auxiliary coil; ρ represents the resistivity of the auxiliary coil; l cs q represents the total length of the auxiliary coil; s N represents the cross-sectional area of ​​the selected coil material; a The number of turns of the auxiliary coil is indicated; r1 represents the inner diameter of the auxiliary coil mounting position; r2 represents the outer diameter of the auxiliary coil mounting position; δ4 represents the height of the auxiliary coil; d a This indicates the wire diameter of the selected coil material.

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