Solenoid valve

Abstract

The present disclosure relates to a solenoid valve conforming to the standard of the port specification code number 03 according to ISO 4401:2005. The wire of the winding (110) with the insulating layer has a diameter of 0.380 mm to 0.400 mm, and the first magnetically permeable section (121) has a thickness of 2.20 mm to 3.00 mm in the radial direction. The present disclosure further relates to a corresponding solenoid valve which conforms to the standard of the port specification code number 05 according to ISO 4401:2005. Compared with the existing solenoid valves of the same specification, the solenoid valves according to the present disclosure have the same or even improved working performance, and at the same time, the amount of conductive material used for manufacturing the wire of the winding is reduced.

Description

85 / DA97M01 / WO December 11, 2025SOLENOID VALVETECHNICAL FIELD

[0001] The present disclosure relates to the field of valves, in particular to a solenoid valve.BACKGROUND

[0002] Solenoid valves are used to control the flow of fluid in a fluid system or fluid equipment. For example, directional control valves can control the direction of fluid flow in related equipment. A directional control valve may be a solenoid valve that controls the direction of fluid flow in the valve body through at least one solenoid assembly.

[0003] In some application fields of solenoid valves, such as hydraulic system, there are certain standards or specifications for the mounting of solenoid valves.Accordingly, similar to electrical parameters, the external dimensions and interfacing dimensions of commercially-available solenoid valves are generally designed according to the specific specifications. Therefore, for solenoid valves with specific specifications, their internal basic structures and parameters have rarely been improved over time.

[0004] However, for some existing solenoid valves, it is still hoped that they can have optimized structures, so that the raw material consumption and energy consumption in the product manufacturing process are reduced, and at the same time the valves have the same or even improved working performance.SUMMARY

[0005] In view of the above problems, according to a first aspect of the present disclosure, a solenoid valve is proposed, including a valve body, a spool and at least one solenoid assembly, each solenoid assembly includes a winding and an outer magnetically permeable casing arranged outside the winding, the winding defines an axial direction, a radial direction and a circumferential direction, and a section of the outer magnetically permeable casing located radially outside the winding defines a first magnetically permeable section, and the solenoid valve conforms to the standard of the port specification code number 03 according to ISO 4401 :2005, the wire of the winding withthe insulating layer has a diameter of 0.380 mm to 0.400 mm, and the first magnetically permeable section has a thickness of 2.20 mm to 3.00 mm in the radial direction.

[0006] In the solenoid valve according to the first aspect of the present disclosure, structures related to the generation and distribution of magnetic flux lines in the solenoid assembly are improved, so that the solenoid valve has the same or even improved working performance compared with the existing solenoid valves, and at the same time, the amount of conductive materials used for manufacturing wires of the windings is reduced. In other words, the solenoid valve according to the first aspect of the present disclosure can reduce raw material consumption and energy consumption (for example, helping reduce carbon footprint, etc.) in the manufacturing process while ensuring or even improving working performance of the valve. In addition, the solenoid valve according to the first aspect of the present disclosure can be assembled and manufactured by combining the windings and the first magnetically permeable section having the above parameters with other components adopted in existing solenoid valves of the same specifications, further reducing the production cost.

[0007] Specifically, for solenoid valves that conform to the standard of the port specification code number 03 according to ISO 4401 :2005, the diameter of the winding wire is generally greater than 0.410 mm. In addition, if there is a corresponding outer magnetically permeable casing, the radial thickness of the portion thereof located radially outside the winding is generally less than 2.00 mm. However, the applicant found that the solenoid valve can still work normally in its original working voltage and power range (for example, the working voltage is 12 + / - 10% VDC or 24 + / - 10% VDC, and the power is 26 W to 32 W) when the diameter of the winding wire is reduced within a certain extent and the radial thickness of the first magnetically permeable section of the outer magnetically permeable casing located radially outside the winding is increased within a certain extent. Compared with existing solenoid valves, in the solenoid valve according to the first aspect of the present disclosure, the spool can receive the same or even greater driving force from the at least one solenoid assembly, so that the solenoid valve can have a larger upper limit for both the fluid flow and the fluid pressure.

[0008] Generally speaking, the diameter of the winding wire of the solenoid assembly is not a parameter to be adjusted for a solenoid valve with a specific specification, especially in the case where reducing the total cost of raw materials and ensuring the performance of the solenoid valve are both desired. In related fields, a common concept is that if the solenoid valve needs to work at the original working voltage and electrical power, the reduction of the diameter of the winding wire will require the reduction of the total length of the winding wire, which will lead to the decrease of the number of winding turns and thus the reduction of the driving force on the spool.However, during research, the applicant found that by increasing the radial thickness ofsaid first magnetically permeable section of the outer magnetically permeable casing within a certain extent, the driving force from the solenoid assembly on the spool can be ensured to remain unchanged or even increased.

[0009] Further, generally speaking, for a solenoid valve with a specific specification, the outer magnetically permeable casing is a component for both conducting magnetic flux lines and supporting the structure of the solenoid assembly, and its radial thickness is not a parameter to be adjusted. However, during research, the applicant found that for a solenoid valve with a specific specification, within its specified external size range, by increasing the radial thickness of the first magnetically permeable section of the outer magnetically permeable casing within a certain extent, the magnetic flux traveling through the first magnetically permeable section can be significantly increased, and the driving force of the solenoid assembly to the armature located therein can thus be increased. Therefore, even if the magnetic flux generated by the winding (which is related to the product of the number of turns N of the winding and the current I flowing through the winding) decreases within a certain extent, the driving force of the solenoid assembly on the spool can still remain unchanged or even increase.

[0010] Through analysis and verification, the applicant found that the solenoid valve according to the first aspect of the present disclosure can work normally within the original working voltage and power range, and has the same or improved performance. In addition, the amount of conductive materials (such as copper) used for manufacturing winding wires can be reduced by 10% to 20%.

[0011] The solenoid valve according to the first aspect of the present disclosure may have one or more of the following characteristics alone or in combination.

[0012] According to one embodiment, preferably, the wire of the winding without the insulating layer has a diameter of 0.340 mm to 0.380 mm.

[0013] According to an embodiment, preferably, the first magnetically permeable section has a thickness of 2.20 mm to 2.60 mm in the radial direction. The solenoid valve according to this embodiment has the advantages mentioned above, and at the same time, it has a relatively material-saving outer magnetically permeable casing.

[0014] According to one embodiment, preferably, the first magnetically permeable section extends around the winding in the circumferential direction for an angle between 270 and 360 degrees.

[0015] According to one embodiment, preferably, the winding has a resistance of 16 ohms to 23 ohms.

[0016] According to one embodiment, preferably, the outer magnetically permeable casing further comprises a second magnetically permeable section and a third magnetically permeable section which are respectively located at either axial end of the winding and connected to the first magnetically permeable section, and respectivethicknesses of the second magnetically permeable section and the third magnetically permeable section in the axial direction are larger than a thickness of the first magnetically permeable section in the radial direction.

[0017] According to a second aspect of the present disclosure, a solenoid valve is proposed, including a valve body, a spool and at least one solenoid assembly, each solenoid assembly includes a winding and an outer magnetically permeable casing arranged outside the winding, the winding defines an axial direction, a radial direction and a circumferential direction, and a section of the outer magnetically permeable casing located radially outside the winding defines a first magnetically permeable section, and the solenoid valve conforms to the standard of the port specification code number 05 according to ISO 4401 :2005, the wire of the winding with the insulating layer has a diameter of 0.550 mm to 0.600 mm, and the first magnetically permeable section has a thickness of 2.80 mm to 3.50 mm in the radial direction.

[0018] Similar to the solenoid valve according to the first aspect of the present disclosure, the solenoid valve according to the second aspect of the present disclosure has the same or even improved working performance compared with existing solenoid valves of the same specification, in addition, the amount of conductive materials (such as copper) used for manufacturing the winding wires is reduced, thus reducing the raw material consumption and energy consumption in the manufacturing process of the product. Similarly, the solenoid valve according to the second aspect of the present disclosure can still work normally within its original working voltage and power range (for example, the working voltage is 12 + / - 10% VDC or 24 + / - 10% VDC and the power is 36 W to 42 W).

[0019] The solenoid valve according to the second aspect of the present disclosure may have one or more of the following characteristics alone or in combination.

[0020] According to one embodiment, preferably, the wire of the winding without the insulating layer has a diameter of 0.500 mm to 0.570 mm.

[0021] According to an embodiment, preferably, the first magnetically permeable section has a thickness of 2.80 mm to 3.20 mm in the radial direction. The solenoid valve according to this embodiment has the advantages mentioned above, and at the same time, it has a relatively material-saving outer magnetically permeable casing.

[0022] According to one embodiment, preferably, the first magnetically permeable section extends around the winding in the circumferential direction for an angle between 270 and 360 degrees.

[0023] According to one embodiment, preferably, the winding has a resistance of 12 ohms to 18 ohms.

[0024] According to one embodiment, preferably, the outer magnetically permeable casing further comprises a second magnetically permeable section and a thirdmagnetically permeable section which are respectively located at either axial end of the winding and connected to the first magnetically permeable section, and respective thicknesses of the second magnetically permeable section and the third magnetically permeable section in the axial direction are larger than a thickness of the first magnetically permeable section in the radial direction.BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to illustrate the technical solutions of the embodiments of the present disclosure more clearly, the accompanying drawings of the embodiments of the present disclosure will be briefly introduced hereinafter. The accompanying drawings are only used to illustrate some embodiments of the present disclosure, but not to limit all the embodiments of the present disclosure thereto.

[0026] Fig. 1 is a schematic perspective view of a solenoid valve according to the present disclosure.

[0027] Fig. 2 is a schematic partial sectional view of a solenoid valve according to the present disclosure.

[0028] Figs. 3A and 3B are schematic cross-sectional views of a solenoid assembly of the solenoid valve according to the present disclosure, which respectively show views when the armature is in different positions.

[0029] Fig. 4 is a schematic cross-sectional view of some components of the solenoid assembly, the cross section plane orthogonal to the axis of the winding of the solenoid assembly.LIST OF REFERENCE NUMERALS

[0030] 10 solenoid valve

[0031] 100 first solenoid assembly

[0032] 110 winding

[0033] 120 outer magnetically permeable casing

[0034] 121 first magnetically permeable section

[0035] 122 second magnetically permeable section

[0036] 123 third magnetically permeable section

[0037] 130 bobbin

[0038] 135 filled portion

[0039] 140 armature

[0040] 141 peripheral portion of armature

[0041] 142 central portion of armature

[0042] 143 inner end face of armature

[0043] 145 push rod

[0044] 146 end of push rod

[0045] 150 inner magnetically permeable casing

[0046] 153 end face of inner magnetically permeable casing

[0047] 160 magnetically isolation section

[0048] 170 wire connection assembly

[0049] 180 housing of first solenoid assembly

[0050] 181 circumferential section of housing

[0051] 182 end section of housing

[0052] 200 second solenoid assembly

[0053] 510 valve body

[0054] 520 spool

[0055] L0 central axis of solenoid valve

[0056] L1 axis of winding

[0057] T1 thickness of first magnetically permeable section in radial direction

[0058] T2 thickness of second magnetically permeable section in axial direction

[0059] T3 thickness of third magnetically permeable section in axial directionDETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] In order to make the purpose, solution and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of specific embodiments of the present disclosure. In the drawings, the same reference numerals represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present disclosure, but not all of them. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of skills in the art without creative labor are within the protection scope of the present disclosure.

[0061] Unless otherwise defined, the technical terms or scientific terms usedhere shall have their ordinary meanings as understood by those with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and the like used in the description and claims of the patent application of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words "one" or "an" and the like do not necessarily mean quantity limitation. Words "comprising" or "including" and the like mean that the elements or objects appearing before the word cover the listed elements or objects appearing after the word and their equivalents, without excluding other elements or objects. Phrases like "connected to" or "connected with" are not limited to direct connections, but can include indirect connections. "Up", "down", "left" and "right" are only used to express relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0062] The present disclosure will be described in detail below by describing example embodiments.

[0063] Fig. 1 is a schematic perspective view of a solenoid valve 10 according to the present disclosure, and Fig. 2 is a schematic partial sectional view of the solenoid valve 10 according to the present disclosure. As shown in Figs. 1 and 2, the solenoid valve 10 includes a valve body 510, a spool 520, a first solenoid assembly 100 and a second solenoid assembly 200. Fig. 2 shows a cross section of the valve body 510, a complete spool 520, as well as the first solenoid assembly 100 and the second solenoid assembly 200. The valve body 510 has channels therein for fluid circulation and a cavity allowing the spool 520 to move. The first solenoid assembly 100 and the second solenoid assembly 200 are attached to either end of the valve body 510 respectively, so that the spool 520 can be driven to move in opposite directions along the central axis L0 of the solenoid valve 10. For example, as will be described in detail later, the axis L1 of the winding of the first solenoid assembly 100 is parallel or even coincident with the central axis L0 of the solenoid valve 10, and the axis of the winding of the second solenoid assembly 200 is also parallel or even coincident with the central axis L0 of the solenoid valve 10, so that the respective armatures of the first solenoid assembly 100 and the second solenoid assembly 200 can drive the movement of the spool 520.

[0064] The movement of the spool 520 in the cavity of the valve body 510 makes corresponding channels in the valve body 510 communicate or isolate from each other, so as to change the flow of fluid inside the valve body 510. For example, the solenoid valve 10 is a directional control valve. For example, the solenoid valve 10 is a hydraulic valve. The solenoid valve 10 exemplarily shown in Fig. 2 is a three-position four-way valve. However, the present disclosure does not limit the specific internal structure of the valve body 510 of the solenoid valve 10. In addition, according to an embodiment of the present disclosure, the solenoid valve 10 may include solenoid assemblies other than two. Forexample, the solenoid valve 10 may include only one solenoid assembly, the one solenoid valve configured to drive the spool 520 to move in the cavity of the valve body 510. The solenoid valves according to various embodiments of the present disclosure all have the advantages of the solenoid valve 10 which will be described in detail below.

[0065] The solenoid valve 10 according to the present disclosure may conform to the standard with the port specification code of 03 according to ISO 4401 :2005 (ISO 4401 -03-02-0-05) or the standard with the port specification code of 05 according to ISO 4401 :2005 (ISO 4401 -05-04-0-05). The specific structure of the solenoid valve 10 shown in the attached drawings is schematic, and the dimensions of each component as well as the relative relationship between the dimensions shown are also schematic. Next, details of an embodiment of the present disclosure will be described mainly with reference to the solenoid valve 10 conforming to the standard of port specification code 03.

[0066] Figs. 3A and 3B show schematic cross-sectional views of a first solenoid assembly 100 of a solenoid valve 10 according to an embodiment of the present disclosure. As shown in Figs. 3A and 3B, the first solenoid assembly 100 includes a winding 110 formed by winding a wire thereof around a bobbin 130 made of, for example, plastic. Thus, the winding 110 is substantially tubular. The wire of the winding 110 includes a conductive center portion formed of a conductive material (e.g., copper) and an insulating layer surrounding the conductive center portion. The insulating layer is formed separately or by coating on the surface of the conductive center portion, for example. The ends of the wire of the winding 110 are connected to the wire connection assembly 170, and the wire connection assembly 170 is electrically connected to a power supply, so that the wire of the winding 110 can be energized to generate a magnetic field at the winding 110.

[0067] Figs. 3A and 3B also show an outer magnetically permeable casing 120. The outer magnetically permeable casing 120 includes a first magnetically permeable section 121 , a second magnetically permeable section 122 and a third magnetically permeable section 123. The first magnetically permeable section 121 is located at the radial outer side of the winding 110, for example, of approximately tubular shape, and is used for guiding the magnetic flux lines generated by the winding 110. Here, the radial direction and the corresponding axial direction and circumferential direction can be defined with respect to the winding 110, that is, with respect to the axis L1 of the winding 110. Referring to Figs. 3A and 3B, it is possible that the first magnetically permeable section 121 is not closed in the circumferential direction, but extend for a relatively large portion of the 360 degrees in the circumferential direction. Fig. 4 shows a cross-sectional view of some components of the first solenoid assembly 100, the cross section plane orthogonal to the axis L1 of the winding 110 and passing through the first magnetically permeable section 121 . In particular, in Fig. 4, the bobbin 130, the first magneticallypermeable section 121 and a circumferential section 181 of a housing 180 are shown, and the first magnetically permeable section 121 is not closed in the circumferential direction. For example, an angle of the first magnetically permeable section 121 extending around the winding 110 in the circumferential direction is between 270 and 360 degrees. Accordingly, a connection part between the wire of the winding 110 and the wire connection assembly 170 is arranged at the position where the first magnetically permeable section 121 is not closed in the circumferential direction, by which it is ensured that the first magnetically permeable section 121 guides enough magnetic flux lines inside its material.

[0068] The second magnetically permeable section 122 and the third magnetically permeable section 123 are located at either axial end of the winding 110 and connected to the first magnetically permeable section 121 . According to an embodiment of the present disclosure, the second magnetically permeable section 122 and the third magnetically permeable section 123 each have an annular disk shape. The second magnetically permeable section 122 and the third magnetically permeable section 123 are connected, at their respective peripheries, to the first magnetically permeable section 121, and are passed through at their respective center portions so as to arrange the inner magnetically permeable casing 150 of the first solenoid assembly 100. Thereby, the first magnetically permeable section 121 , the second magnetically permeable section 122 and the third magnetically permeable section 123 guide magnetic flux lines at the radial outer side and the axial ends of the winding 110. For example, the first magnetically permeable section 121, the second magnetically permeable section 122 and the third magnetically permeable section 123 may be integrated over the bobbin 130 as in the existing manufacturing process (see also Fig. 4 for example), which avoids magnetic leakage at the connection between these components.

[0069] As shown in Figs. 3A and 3B, a housing 180 of the first solenoid assembly may be disposed on the outside of the outer magnetically permeable casing 120. A circumferential section 181 of the housing 180 may be formed by molding, for example, from a polymer. In addition, a filled portion 135 formed between the outer periphery of the winding 110 and the radially inner side of the first magnetically conductive section 121 of the outer magnetically conductive housing 120 may also be formed of the same polymer. A thin spacer (not shown), for example made of paper, may be provided between the lateral outer surface of the winding 110 and the polymer. An end section 182 of the housing 180 and the circumferential section 181 together surround the internal components of the first solenoid assembly 100. The end section 182 of the housing 180 can also be used to fix a part of the inner magnetically permeable casing 150 of the first solenoid assembly 100.

[0070] The inner magnetically permeable casing 150 of the first solenoidassembly 100 is located approximately radially inside the bobbin 130 and has a hollow structure. The inner magnetically permeable casing 150 is fixed with respect to the bobbin 130, and is arranged to extend at least from the second magnetically permeable section 122 to the third magnetically permeable section 123 along the axial direction of the winding 110 for guiding magnetic flux lines at the radially inner side of the winding 110. The inner magnetically permeable casing 150 may be provided with an annular groove at or near its radially outer surface. The annular groove is located between both ends of the winding 110 along the axial direction, and a magnetically isolation section 160 is arranged in the annular groove. The magnetically isolation section 160 is configured to be made of a material through which magnetic flux lines do not pass. The magnetically isolation section 160 breaks the magnetic flux path in the inner magnetically permeable casing 150, so that the armature 140 is forced to move inside the inner magnetically permeable casing 150 along the axis L1. For example, the magnetically isolation section 160 is formed by brazing.

[0071] With further reference to Figs. 3A and 3B, a armature 140 is arranged in the hollow interior of the inner magnetically permeable casing 150, and the armature 140 is able to move along the axial direction in the hollow interior of the inner magnetically permeable casing 150. The armature 140 may include a peripheral portion 141 and a central portion 142 fixedly connected to each other, among which at least the peripheral portion 141 is made of a magnetic material (such as soft iron) and can be penetrated by magnetic flux lines. The peripheral portion 141 of the armature 140 is arranged close to the inner wall of the inner magnetically permeable casing 150. Therefore, by energizing the winding 110, the armature 140 can be driven to move in the hollow interior of the inner magnetically permeable casing 150. A push rod 145 is fixed to one end of the armature 140. One end of the push rod 145 is mounted at an end of the central portion 142 of the armature 140, for example, and the other end 146 of the push rod 145 is connected to the spool 520 of the solenoid valve 10. Thereby, the movement of the armature 140 along the axial direction can push the spool 520 to move, so as to change the flow of fluid inside the solenoid valve 10. In Fig. 3A, the armature 140 is located closer to the right, and there is a non-zero distance between an inner end face 143 of the armature 140 and an end face 153 of the inner magnetically permeable casing 150 facing the armature 140. In Fig. 3B, the armature 140 is located closer to the left, and the inner end face 143 of the armature 140 and the end face 153 of the inner magnetically permeable casing 150 are close to each other.

[0072] Specifically, when the winding 110 is energized, magnetic flux lines are generated in the inner and outer spaces of the tubular shape of the winding 110. The first magnetically permeable section 121, the second magnetically permeable section 122 and the third magnetically permeable section 123 of the outer magnetically permeable casing120 as well as corresponding portions of the inner magnetically permeable casing 150 and the armature 140 can be passed through by magnetic flux lines. Thereby, the winding 110 drives the armature 140 to move in the hollow interior of the inner magnetically permeable casing 150. Therefore, the driving force that the armature 140 is subjected to affects the maximum fluid pressure and maximum fluid flow allowed by the solenoid valve 10 under normal operation.

[0073] According to the present disclosure, by optimizing the dimensions or parameters of the corresponding components in the first solenoid assembly 100, the driving force on the armature 140 can be maintained or increased under a condition of reduced conductive material forming the winding 110, thereby ensuring or increasing the maximum fluid pressure and maximum fluid flow allowed by the solenoid valve.

[0074] For the solenoid valve 10 conforming to the standard of the port specification code 03 according to ISO 4401 :2005, the wire of the winding 10, including the insulating layer, may have a diameter of 0.380 mm to 0.400 mm, and the first magnetically permeable section 121 may have a thickness of 2.20 mm to 3.00 mm in the radial direction. For example, the winding 110 may have a diameter of 0.340 mm to 0.380 mm without including the insulating layer, and the entire winding 110 may have a resistance of 16 ohms to 23 ohms. Thereby, the amount of conductive material (such as copper) used for the wire of the winding 110 can be reduced by 15% to 20%. According to an embodiment of the present disclosure, the first magnetically permeable section 121 may further have a thickness of 2.20 mm to 2.60 mm in the radial direction, so as to reduce the requirement for the installation space of the solenoid valve 10, and reduce the requirement for the material consumption of the outer magnetically permeable casing 120, and at the same time, the working performance of the solenoid valve 10 is ensured. Further, according to an embodiment of the present disclosure, the thickness T2 of the second magnetically permeable section 122 and the thickness T3 of the third magnetically permeable section 123 of the outer magnetically permeable casing 120 in the axial direction are both greater than the thickness T1 of the first magnetically permeable section 121 in the radial direction, so as to maintain or increase the driving force subjected to by the armature 140. In addition, according to an embodiment of the present disclosure, the winding 110 has an inner diameter of 22.00 mm to 25.00 mm. Then, for example, the inner diameter of the first magnetically permeable section 121 of the outer magnetically permeable casing 120 may be between 36.00 mm and 40.00 mm.

[0075] For the solenoid valve 10 conforming to the standard of the port specification code 05 according to ISO 4401 :2005, the wire of the winding 10, including the insulating layer, may have a diameter of 0.550 mm to 0.600 mm, and the first magnetically permeable section 121 may have a thickness of 2.80 mm to 3.50 mm in the radial direction. For example, the winding 110 may have a diameter of 0.500 mm to 0.570mm without including the insulating layer, and the entire winding 110 may have a resistance of 12 ohms to 18 ohms. Thereby, the amount of conductive material (such as copper) used for the wire of the winding 110 can be reduced by 15% to 20%. According to an embodiment of the present disclosure, the first magnetically permeable section 121 may further have a thickness of 2.80 mm to 3.20 mm in the radial direction, so as to reduce the requirement for the installation space of the solenoid valve 10, and reduce the requirement for the material consumption of the outer magnetically permeable casing 120, and at the same time, the working performance of the solenoid valve 10 is ensured. Further, according to an embodiment of the present disclosure, the thickness T2 of the second magnetically permeable section 122 and the thickness T3 of the third magnetically permeable section 123 of the outer magnetically permeable casing 120 in the axial direction are both greater than the thickness T1 of the first magnetically permeable section 121 in the radial direction, so that there is more area in general to conduct the magnetic flux lines, which at least maintain or even increase the driving force subjected to by the armature 140. In addition, according to an embodiment of the present disclosure, the winding 110 has an inner diameter of 29.00 mm to 33.00 mm. Then, for example, the inner diameter of the first magnetically permeable section 121 of the outer magnetically permeable casing 120 may be between 53.00 mm and 60.00 mm.

[0076] Exemplary implementations of the solenoid valve proposed by the present disclosure are described in detail above with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present disclosure, various changes and modifications on the above-mentioned specific embodiments can be made, and various technical features and structures proposed in the present disclosure can be combined in various ways without exceeding the protection scope of the present disclosure.

Claims

85 / DA97M01 / WO - December. 11, 2025Claims1. A solenoid valve comprising a valve body (510), a spool (520) and at least one solenoid assembly (100), wherein each solenoid assembly comprises a winding(110) and an outer magnetically permeable casing (120) arranged outside the winding, the winding (110) defines an axial direction, a radial direction and a circumferential direction, and a section of the outer magnetically permeable casing (120) located radially outside the winding (110) defines a first magnetically permeable section (121 ), and wherein the solenoid valve (10) conforms to the standard of the port specification code number 03 according to ISO 4401 :2005, the wire of the winding (110) with the insulating layer has a diameter of 0.380 mm to 0.400 mm, and the first magnetically permeable section (121 ) has a thickness of 2.20 mm to 3.00 mm in the radial direction.

2. The solenoid valve according to claim 1 , wherein the wire of the winding (110) without the insulating layer has a diameter of 0.340 mm to 0.380 mm.

3. The solenoid valve according to claim 1 , wherein the first magnetically permeable section (121) has a thickness of 2.20 mm to 2.60 mm in the radial direction.

4. The solenoid valve according to claim 1 , wherein the first magnetically permeable section (121) extends around the winding (110) in the circumferential direction for an angle between 270 and 360 degrees.

5. The solenoid valve according to claim 1 , wherein the winding (110) has a resistance of 16 ohms to 23 ohms.

6. The solenoid valve according to any one of claims 1 to 5, wherein the outer magnetically permeable casing (120) further comprises a second magnetically permeable section (122) and a third magnetically permeable section (123) which are respectively located at either axial end of the winding (110) and connected to the first magnetically permeable section (121), and respective thicknesses of the second magnetically permeable section (122) and the third magnetically permeable section (123) in the axial direction are larger than a thickness of the first magnetically permeable section (121) in the radial direction.85 / DA97M01 / WO - December. 11, 20257. A solenoid valve comprising a valve body (510), a spool (520) and at least one solenoid assembly (100), wherein each solenoid assembly comprises a winding(110) and an outer magnetically permeable casing (120) arranged outside the winding, the winding (110) defines an axial direction, a radial direction and a circumferential direction, and a section of the outer magnetically permeable casing (120) located radially outside the winding (110) defines a first magnetically permeable section (121 ), and wherein the solenoid valve (10) conforms to the standard of the port specification code number 05 according to ISO 4401 :2005, the wire of the winding (110) with the insulating layer has a diameter of 0.550 mm to 0.600 mm, and the first magnetically permeable section (121 ) has a thickness of 2.80 mm to 3.50 mm in the radial direction.

8. The solenoid valve according to claim 7, wherein the wire of the winding (110) without the insulating layer has a diameter of 0.500 mm to 0.570 mm.

9. The solenoid valve according to claim 7, wherein the first magnetically permeable section (121) has a thickness of 2.80 mm to 3.20 mm in the radial direction.

10. The solenoid valve according to claim 7, wherein the first magnetically permeable section (121) extends around the winding (110) in the circumferential direction for an angle between 270 and 360 degrees.11 . The solenoid valve according to claim 7, wherein the winding (110) has a resistance of 12 ohms to 18 ohms.

12. The solenoid valve according to any one of claims 7 to 11 , wherein the outer magnetically permeable casing (120) further comprises a second magnetically permeable section (122) and a third magnetically permeable section (123) which are respectively located at either axial end of the winding (110) and connected to the first magnetically permeable section (121), and respective thicknesses of the second magnetically permeable section (122) and the third magnetically permeable section (123) in the axial direction are larger than a thickness of the first magnetically permeable section (121) in the radial direction.

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