solenoid valve

Abstract

The application provides an electromagnetic valve, which comprises a pipe sleeve, a static iron core, an armature assembly and an excitation assembly, the pipe sleeve has a pipe section and an end plate arranged at an axial end of the pipe section, the end plate is provided with a first air hole, the pipe section is provided with a second air hole, the static iron core is fixed at one end of the pipe sleeve, the armature assembly has a plug part, the excitation assembly is used for separating the plug part from the first air hole, in the thickness direction from outside to inside of the end plate, the first air hole has a coaxially connected cylindrical hole section and a conical hole section, the diameter of the conical hole section gradually increases, the plug part is conical, the center of the plug part is in line with the center of the first air hole, and the diameter of the plug part is larger than the large end diameter of the conical hole section, when the plug part closes the first air hole, the conical surface of the plug part is sealingly attached to the conical surface of the conical hole section. In the electromagnetic valve, the plug part and the conical hole section seal the first air hole in a surface contact mode, the sealing area is increased, and the sealing effect is improved.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a solenoid valve. Background Technology

[0002] The existing solenoid valve includes a magnetic shielding tube, a valve nozzle, a stationary iron core, an armature assembly, and an excitation assembly. The valve nozzle is located at one end of the magnetic shielding tube, and the valve nozzle has two air holes. The magnetic shielding tube is located at the other end of the magnetic shielding tube. The armature assembly is movably located inside the magnetic shielding tube and has a plug for sealing the air holes. When the excitation assembly is energized, it causes the armature assembly to move, thereby moving the plug so that the plug can cover or open the air holes, thereby achieving airflow regulation.

[0003] The aforementioned existing technology has technical defects. In the existing technology, the pores are usually straight holes with flat inner walls, and the sealing surface of the plug used to seal the pores is a plane. This sealing method has poor airtightness and needs to be improved. Utility Model Content

[0004] One objective of this application is to provide a solenoid valve to improve the sealing performance of a first vent.

[0005] A further objective of this application is to reduce the processing difficulty of the first vent hole while ensuring the fit between the tapered hole section and the plug head.

[0006] Specifically, this application provides a solenoid valve, comprising: a sleeve defining a receiving cavity, the sleeve having a pipe section and an end plate disposed at one axial end of the pipe section, the end plate having a first vent hole communicating with the receiving cavity, and the pipe section having a second vent hole; a stationary iron core fixed to one end of the sleeve; an armature assembly movably disposed in the receiving cavity along the axial direction of the sleeve, and the armature assembly having a plug for closing the first vent hole; and an excitation assembly for generating a force that causes the armature assembly to move away from the first vent hole, causing the plug to... The head detaches from the first vent, allowing the first vent and the second vent to communicate through the receiving cavity. The first vent has a coaxially connected cylindrical section and a conical section along the thickness direction of the end plate from the outside in, with the diameter of the conical section gradually increasing. The plug head is conical, with its center aligned with the center of the first vent, and its diameter greater than the large end diameter of the conical section. When the plug head seals the first vent, the conical tip of the plug head extends into the cylindrical section, and the conical surface of the plug head seals against the conical surface of the conical section.

[0007] In one alternative embodiment, the plug is made of an elastomeric material; and the absolute value of the taper difference between the plug and the tapered bore is set to be less than or equal to 0.1.

[0008] In one alternative embodiment, the ratio of the size d1 of the cylindrical bore section to the size d2 of the tapered bore section in the axial direction of the sleeve is set between 0.8 and 1.5.

[0009] In one alternative implementation, the taper of the tapered bore segment is set between 5 and 8.

[0010] In one optional embodiment, the orthographic projection of the profile of the cylindrical hole section onto the plug head along the axial direction of the sleeve is denoted as the projection circle; the distance between the projection circle and the vertex of the plug head along the axial direction of the sleeve is denoted as d3; the length of the cylindrical hole section along the axial direction of the sleeve is denoted as d1; wherein d1 and d2 satisfy: 1.1≤d3 / d1≤1.5.

[0011] In one alternative embodiment, the ratio of the inner diameter of the cylindrical hole section to the diameter of the plug is set between 0.25 and 0.5.

[0012] In one alternative embodiment, the ratio of the large end diameter of the tapered orifice to the diameter of the plug is set between 0.5 and 0.8.

[0013] In one alternative embodiment, the armature assembly further includes: an armature extending axially along the sleeve; and a plugging member sleeved at the end of the armature near the first vent hole, the plugging member having a plug head for closing the first vent hole.

[0014] In one alternative implementation, the sealing element is made of an elastomeric material.

[0015] In one alternative implementation, the sealing element is made of rubber or elastic plastic.

[0016] In the solenoid valve of this application, the first vent hole has a coaxially connected cylindrical section and a tapered section along the thickness direction of the end plate from the outside to the inside, with the diameter of the tapered section gradually increasing. The plug head is conical, with its center aligned with the center of the first vent hole, and its diameter is larger than the large end diameter of the tapered section. When the plug head seals the first vent hole, the conical tip of the plug head extends into the cylindrical section, and the conical surface of the plug head seals against the conical surface of the tapered section. Therefore, the plug head seals the first vent hole through surface contact with the tapered section, increasing the sealing area and improving the sealing effect.

[0017] Furthermore, in the solenoid valve of this application, since the plug head is made of an elastomeric material (such as rubber, elastic plastic, etc.), the absolute value of the taper difference between the plug head and the tapered orifice section is set to be less than or equal to 0.1. This allows the plug head to adaptively compensate for small-range taper deviations through elastic deformation within a certain range of taper difference between the plug head and the tapered orifice section. In other words, even if there is a slight mismatch on the tapered surface, the deformation of the elastic material can fill the potential gap and ensure the sealing of the contact. This avoids the elastic material being unable to fully compensate due to excessive error, and also eliminates the need for ultra-precision machining, reducing machining difficulty and production costs, ultimately achieving a balance between machining feasibility and sealing reliability.

[0018] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0019] The following sections will describe some specific embodiments of this application in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic perspective view of a solenoid valve according to one embodiment of this application; Figure 2 This is a diagram showing the state where the first vent of the solenoid valve is closed according to an embodiment of this application; Figure 3 This is a diagram showing the state of the first vent in the solenoid valve being open according to an embodiment of this application; Figure 4 yes Figure 2 A magnified view of part A; Figure 5 This is a schematic diagram of the sleeve in a solenoid valve according to an embodiment of this application; Figure 6 yes Figure 5 A magnified view of part B; Figure 7 This is a diagram showing the state changes of the plug head blocking the first vent hole in a solenoid valve according to an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the first vent in a solenoid valve according to an embodiment of this application. Detailed Implementation

[0020] In existing solenoid valves, the air vent is usually a straight hole with a flat inner wall, and the sealing surface of the plug used to seal the air vent is a plane. This sealing method has poor air tightness and needs to be improved.

[0021] To overcome the deficiencies in the prior art, this application provides a solenoid valve in which the first vent hole has a coaxially connected cylindrical section and a tapered section along the thickness direction of the end plate from the outside to the inside, and the diameter of the tapered section gradually increases. The plug head is conical, with its center aligned with the center of the first vent hole, and its diameter is larger than the large end diameter of the tapered section. When the plug head seals the first vent hole, the conical tip of the plug head extends into the cylindrical section, and the conical surface of the plug head seals against the conical surface of the tapered section. Therefore, the plug head seals the first vent hole through surface contact with the tapered section, increasing the sealing area and improving the sealing effect.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] This application provides a solenoid valve that can be applied in scenarios such as vehicle air suspension to adjust the air circuit.

[0024] See Figures 1 to 3 In some embodiments, the solenoid valve includes a sleeve 100, a stationary iron core 200, an armature assembly 300, and an excitation assembly 400. The sleeve 100 defines a receiving cavity 101 and has a pipe section 110 and an end plate 120 disposed at one axial end of the pipe section. The end plate 120 has a first vent hole 112 communicating with the receiving cavity 101, and the pipe section 110 has a second vent hole 122. The stationary iron core 200 is fixed to one end of the sleeve 100 opposite to the first vent hole 112. The armature assembly 300 is movably disposed in the receiving cavity 101 along the axial direction of the sleeve 100 and has a plug head 322 for sealing the first vent hole 112. The excitation assembly 400 is used to generate a force that causes the armature 310 to move away from the first vent 112, thereby driving the sealing member 320 to move away from the first vent 112, so that the plug head 322 is disengaged from the first vent 112, and the first vent 112 is connected to the second vent 122 through the receiving cavity 101.

[0025] In some exemplary embodiments, the sleeve 100 may be made of a magnetically shielding material, such as stainless steel, ferrite, permalloy, copper, aluminum, plastic, etc.

[0026] The sleeve 100 includes a pipe section 110 and an end plate 120. The end plate 120 is disposed at the axial end of the pipe section 110 and is used to cover the axial opening of the pipe section 110. The pipe section 110 and the end plate 120 are coaxially arranged and integrally formed, and the pipe section 110 and the end plate 120 together define a receiving cavity 101. Since the first vent hole 112 is opened in the end plate 120 and the second vent hole 122 is opened in the pipe section 110, when the first vent hole 112 and the second vent hole 122 are open, the first vent hole 112 and the second vent hole 122 are connected through the receiving cavity 101.

[0027] The stationary iron core 200 may be made of a magnetically conductive material (e.g., a ferromagnetic alloy), and the stationary iron core 200 is fixed to the end of the sleeve 100 away from the first vent hole 112.

[0028] The armature assembly 300 may include an armature 310 and a plug 320. The armature 310 may be made of a magnetically conductive material (e.g., a ferromagnetic alloy) and extends axially along the sleeve 100. The plug 320 may be made entirely of an elastomeric material (e.g., rubber or elastic plastic) and is fitted onto the end of the armature 310 near the first vent 112. The plug 320 has a plug head 322 for closing the first vent 112.

[0029] When the excitation assembly 400 is energized, it generates an induced magnetic field. The ends of the stationary iron core 200 and the armature 310 that are close to each other generate opposite magnetic poles, which allows the armature 310 to be attracted by the stationary iron core 200. The armature 310 drives the sealing member 320 to move away from the first vent 112. The plug head 322 on the sealing member 320 disengages from the first vent 112 to open the first vent 112, so that the first vent 112 is connected to the receiving cavity 101.

[0030] Since the second vent 122 is also connected to the receiving cavity 101, when the plug head 322 is disengaged from the first vent 112, the first vent 112 and the second vent 122 are connected through the receiving cavity 101. At this time, when air enters through the first vent 112, air can exit through the second vent 122; when air enters through the second vent 122, air can exit through the first vent 112.

[0031] See Figures 2 to 6In some embodiments, in the thickness direction from the outside to the inside of the end plate 120, the first vent 112 has a coaxially connected cylindrical section 1122 and a tapered section 1124, and the diameter of the tapered section 1124 gradually increases. The plug head 322 is conical, the center of the plug head 322 is on the same straight line as the center of the first vent 112, and the diameter of the plug head 322 is larger than the large end diameter of the tapered section 1124. When the plug head 322 closes the first vent 112, the conical tip of the plug head 322 extends into the cylindrical section 1122, and the conical surface of the plug head 322 seals against the conical surface of the tapered section 1124.

[0032] Since the center of the plug head 322 and the center of the first vent 112 are on the same straight line, the centers of the plug head 322, the cylindrical hole section 1122 and the conical hole section 1124 are collinear.

[0033] The plug head 322 is set in a conical shape. Understandably, the diameter of the plug head 322 gradually decreases in the direction close to the first vent 112. That is to say, the diameter of the plug head 322 gradually increases in the thickness direction of the end plate 120 from the outside to the inside.

[0034] Since the first vent 112 has a coaxially connected cylindrical hole section 1122 and a tapered hole section 1124 in the thickness direction from the outside to the inside of the end plate 120, and the diameter of the tapered hole section 1124 gradually increases, it means that the tapered hole section 1124 is closer to the plug head 322, and the tapered hole section 1124 and the plug head 322 are inclined in the same way (the diameter gradually increases in the thickness direction from the outside to the inside of the end plate 120).

[0035] With this configuration, as the plug head 322 gradually moves closer to the first vent 112, the conical surface of the plug head 322 can abut against the conical hole section 1124, and the conical tip of the plug head 322 extends into the cylindrical hole section 1122. In this way, the plug head 322 seals the first vent 112 by contacting the conical hole section 1124 with a surface, increasing the sealing area and improving the sealing effect.

[0036] Furthermore, since the center of the plug head 322 is on the same straight line as the center of the first vent hole 112, and the diameter of the plug head 322 is larger than the large end diameter of the tapered hole section 1124, this ensures that the orthogonal projection of the tapered hole section 1124 onto the plug head 322 falls on the plug head 322 in the axial direction of the sleeve 100. In other words, in the axial direction of the sleeve 100, the plug head 322 can completely cover the tapered hole section 1124, thus further ensuring the sealing effect.

[0037] In some embodiments, the plug head 322 is made of an elastomeric material. The absolute value of the taper difference between the plug head 322 and the tapered bore section 1124 is set to be less than or equal to 0.1, for example, 0.1, 0.05, etc.

[0038] Taper refers to the axial inclination of a conical surface (or frustum), defined as the ratio of the difference between the large and small end diameters of the cone to the length of the cone (formula: taper C = (Dd) / L, where D is the large end diameter, d is the small end diameter, and L is the axial length of the cone). The taper of the outer conical surface of the plug head 322 and the inner conical surface of the conical hole section 1124 reflects the consistency of the inclination angle of the two conical surfaces.

[0039] The ideal sealing fit is achieved when the taper difference between the plug head 322 and the tapered hole section 1124 is zero (i.e., their tapers are perfectly identical). At this point, the outer tapered surface of the plug head 322 and the inner tapered surface of the tapered hole section 1124 achieve perfect surface contact along the entire contact length, without any gaps or localized suspension. When fluid pressure acts on the plug head 322 or the first vent hole 112, the pressure is evenly transmitted to the entire tapered surface, forming a seamless sealing barrier. Simultaneously, the perfectly consistent taper ensures that the tapered surface remains coaxially guided when the armature assembly 300 moves, preventing lateral forces and achieving optimal motion stability and sealing reliability.

[0040] However, in actual machining, it is difficult to achieve completely zero-error machining: on the one hand, during machining (such as turning and grinding), factors such as tool wear and equipment accuracy fluctuations can cause slight deviations in the machining of conical surfaces; on the other hand, slight coaxiality deviations during the assembly of solenoid valves may also indirectly affect the fit of the conical surfaces.

[0041] See Figure 7 , Figure 7 The diagram shows a case where the taper of the plug head 322 is different from the taper of the tapered hole section 1124. The dashed line represents the structure of the plug head 322 in its natural state (undeformed), while the solid line represents the structure of the plug head 322 after being squeezed and deformed and fitting with the tapered surface of the tapered hole section 1124.

[0042] In this embodiment, by reasonably setting the material of the plug head 322, the taper difference between the plug head 322 and the tapered hole section 1124 can be allowed to fluctuate within a certain range, which helps to reduce processing difficulty and improve yield.

[0043] Because the plug head 322 is made of an elastomeric material (such as rubber, elastic plastic, etc.), the plug head 322 is made of an elastic material with a certain deformation capability. When subjected to pressure, it can produce a small elastic deformation, which can adaptively compensate for small-range taper deviations. In other words, even if there is a slight mismatch in the tapered surface, the deformation of the elastic material can fill the potential gap and ensure the sealing of the contact.

[0044] Based on the above materials, the plug head 322 is made. In this embodiment, the absolute value of the taper difference between the plug head 322 and the tapered hole section 1124 is set to be less than or equal to 0.1. This avoids the elastic material from being unable to fully compensate due to excessive error, and also eliminates the need for ultra-precision machining, reducing the machining difficulty of the tapered hole section 1124, and ultimately achieving a balance between machining feasibility and sealing reliability.

[0045] See Figure 8 In some embodiments, the ratio of the dimension d1 of the cylindrical hole section 1122 to the dimension d2 of the tapered hole section 1124 in the axial direction of the sleeve 100 is set between 0.8 and 1.5, for example, 0.8, 1, 1.2, 1.3, 1.5, etc.

[0046] If the first vent 112 is entirely composed of the tapered hole segment 1124, then the structure of the first vent 112 near the outer side of the end plate 120 is relatively weak. After being subjected to long-term impact and compression by the plug head 322, the first vent 112 is prone to deformation and damage. The cylindrical hole segment 1122 plays a role in strengthening the first vent 112.

[0047] In this embodiment, the size ratio of the cylindrical hole segment 1122 to the tapered hole segment 1124 is limited to the above range, so that the difference between the two is not too large, avoiding the functional failure of the other hole segment structure due to the excessive proportion of the single hole segment structure, and taking into account both the reinforcing function of the cylindrical hole segment 1122 and the sealing function of the tapered hole segment 1124.

[0048] In some embodiments, the taper of the tapered bore 1124 is set between 5 and 8, such as 5, 6, 6.4, 7, 8, etc.

[0049] In this embodiment, by setting the taper of the tapered hole segment 1124 within the above-mentioned range, the taper of the tapered hole segment 1124 can form a gently sloping conical surface structure, which, in conjunction with the conical structure of the plug head 322, constitutes an efficient guiding system.

[0050] See Figure 8In some embodiments, the orthographic projection of the profile of the cylindrical hole segment 1122 along the axial direction of the sleeve 100 onto the plug head 322 is denoted as projection circle 324. The distance between projection circle 324 and the vertex of plug head 322 along the axial direction of the sleeve 100 is denoted as d3. The length of the cylindrical hole segment 1122 along the axial direction of the sleeve 100 is denoted as d1, where d3 and d1 satisfy: 1.1 ≤ d3 / d1 ≤ 1.5, for example, 1.1, 1.2, 1.3, 1.4, 1.5, etc.

[0051] When the plug head 322 closes the first vent hole 112, the conical tip of the plug head 322 extends into the cylindrical hole section 1122, and the conical surface of the plug head 322 is in sealed contact with the conical surface of the conical hole section 1124. In this state, in the thickness direction from the outside to the inside of the end plate 120, the conical surface of the plug head 322 is in contact with the inner end of the cylindrical hole section 1122. That is to say, when the plug head 322 closes the first vent hole 112, the distance between the projection circle and the vertex of the plug head 322 can be understood as the distance between the point of contact between the conical surface of the plug head 322 and the inner end of the cylindrical hole section 1122 and the vertex of the plug head 322.

[0052] The relationship between d3 and d1 is set within the above range, so that d3 > d1. This allows the plug head 322 to occupy as much of the internal space of the cylindrical hole section 1122 as possible in the thickness direction of the end plate 120, thereby further improving the sealing performance.

[0053] When d3 > d1, the cone tip of the plug head 322 protrudes beyond the outer side of the end plate 120. Therefore, setting the ratio of d3 / d1 to less than or equal to 1.5 can prevent the cone tip of the plug head 322 from protruding too much, which would affect the assembly.

[0054] See Figure 8 In some embodiments, the ratio of the inner diameter R3 of the cylindrical hole section 1122 to the diameter R1 of the plug head 322 is between 0.25 and 0.5, for example, 0.25, 0.3, 0.4, 0.5.

[0055] The ratio of the inner diameter R3 of the cylindrical hole section 1122 to the diameter R1 of the plug head 322 is set within the above range. This allows the inner end of the cylindrical hole section 1122 to contact the plug head 322 near the center when the plug head 322 closes the first vent hole 112. This makes it easier for the plug head 322 to have a larger conical surface area that seals and fits the conical surface of the conical hole section 1124.

[0056] In some embodiments, the ratio of the large end diameter R2 of the tapered hole segment 1124 to the diameter R1 of the plug head 322 is between 0.5 and 0.8, for example, 0.5, 0.6, 0.7, 0.8.

[0057] The ratio of the large end diameter R2 of the tapered hole segment 1124 to the diameter R1 of the plug head 322 is set within the above range, which allows the tapered surface of the tapered hole segment 1124 to be completely covered and fitted by the tapered surface of the plug head 322 when the plug head 322 closes the first vent hole 112.

[0058] See Figure 2 and Figure 3 In some embodiments, the armature 310 has a central hole 318 extending axially and opening toward the stationary iron core 200. The solenoid valve may also include a return spring 800, a first end of which is disposed on the inner end wall of the central hole 318 opposite to its opening, a portion of which is located in the central hole 318 and extends out of the opening of the central hole 318, with its second end connected to the stationary iron core 200, for providing a force to the armature assembly 300 to maintain the seal of the first vent hole 112.

[0059] When the excitation assembly 400 is not energized, the reset spring 800 can be slightly compressed, applying a force to the armature 310 and the sealing member 320 to move closer to the first vent 112, so that the plug head 322 of the sealing member 320 tightly abuts against the first vent 112 to seal the first vent 112.

[0060] When the excitation assembly 400 is energized, an attractive force is generated between the near ends of the stationary iron core 200 and the armature 310. The armature 310 and the sealing member 320 move away from the first vent hole 112, and the return spring 800 is further compressed, applying a force to the armature 310 and the sealing member 320 to move towards the first vent hole 112. When the excitation assembly 400 is de-energized, under this force, the plug head 322 of the sealing member 320 is tightly pressed against the first vent hole 112 to seal the first vent hole 112.

[0061] See Figure 2 and Figure 3 In some exemplary embodiments, the armature 310 has a central hole 318 that extends axially and opens toward the stationary iron core 200. At least 80% of the return spring 800 is located in the central hole 318. This not only helps to hide the section of the return spring 800 and shorten the distance between the armature 310 and the stationary iron core 200 without weakening the spring performance, thereby shortening the axial length of the solenoid valve, but also, since at least 80% of the return spring 800 is located in the central hole 318, most of the return spring 800 is constrained by the central hole 318. This helps to maintain the axial extension posture along the sleeve during compression and opening, improving the reliability of the return spring 800 when applying force.

[0062] See Figure 2 and Figure 3Furthermore, the solenoid valve may also include a noise-reducing liner 900, which has a bushing portion 910 and an anti-collision portion 920. The bushing portion 910 is disposed in the central hole 318, sleeved on the outer periphery of the return spring 800, and fits against the inner wall of the central hole 318. The anti-collision portion 920 is connected to the bushing portion 910 and fits against the end face of the armature 310 facing the stationary iron core 200.

[0063] Furthermore, the noise-reducing liner 900 can be made of elastic materials such as rubber or elastic plastic. The bushing part 910 is provided in the central hole 318 and fits against the inner wall of the central hole 318. This can prevent the return spring 800 from directly scraping against the inner wall of the central hole 318, reducing noise. Moreover, the impact-resistant part 920 isolates the metal contact between the armature 310 and the stationary iron core 200 when they are attracted, reducing the generation of impact noise and vibration.

[0064] See Figure 1 In some embodiments, the solenoid valve may further include a valve seat 500 having an upwardly open mounting cavity 510 into which the sleeve 100 can be inserted. The valve seat 500 may also be provided with a first channel 570 and a second channel 580 communicating with the mounting cavity 510, wherein the first channel 570 communicates with a first vent hole 112 and the second channel 580 communicates with a second vent hole 122.

[0065] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0066] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0067] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0068] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0069] Therefore, those skilled in the art should recognize that although many exemplary embodiments of this application have been shown and described in detail herein, many other variations or modifications conforming to the principles of this application can be directly determined or derived from the disclosure of this application without departing from the spirit and scope of this application. Thus, the scope of this application should be understood and construed as covering all such other variations or modifications.

Claims

1. A solenoid valve, characterized in that, include: A sleeve defining a receiving cavity, the sleeve having a pipe section and an end plate disposed at one axial end of the pipe section, the end plate having a first vent hole communicating with the receiving cavity, and the pipe section having a second vent hole; A stationary iron core, which is fixed to one end of the sleeve; An armature assembly, movably disposed in the receiving cavity along the axial direction of the sleeve, and having a plug for closing the first vent hole; and, An excitation assembly is used to generate a force that causes the armature assembly to move away from the first vent, thereby disengaging the plug from the first vent and allowing the first vent and the second vent to communicate through the receiving cavity; wherein... In the thickness direction from the outside to the inside of the end plate, the first vent hole has a cylindrical hole section and a tapered hole section that are coaxially connected, and the diameter of the tapered hole section gradually increases; The plug head is conical, the center of the plug head is on the same straight line as the center of the first vent hole, and the diameter of the plug head is larger than the large end diameter of the conical hole section. When the plug head closes the first vent hole, the conical tip of the plug head extends into the cylindrical hole section, and the conical surface of the plug head seals against the conical surface of the conical hole section.

2. The solenoid valve according to claim 1, characterized in that, The plug is made of an elastomeric material; and... The absolute value of the taper difference between the plug head and the tapered hole section is set to be less than or equal to 0.

1.

3. The solenoid valve according to claim 1, characterized in that, In the axial direction of the sleeve, the ratio of the size d1 of the cylindrical bore section to the size d2 of the tapered bore section is set between 0.8 and 1.

5.

4. The solenoid valve according to claim 1, characterized in that, The taper of the tapered hole section is set between 5 and 8.

5. The solenoid valve according to claim 1, characterized in that, The orthographic projection of the outline of the cylindrical hole section onto the plug along the axial direction of the sleeve is denoted as the projection circle. Along the axial direction of the sleeve, the distance between the projected circle and the vertex of the plug head is denoted as d3; The length of the cylindrical hole section along the axial direction of the sleeve is denoted as d1; where, d1 and d2 satisfy: 1.1≤d3 / d1≤1.

5.

6. The solenoid valve according to claim 1, characterized in that, The ratio of the inner diameter of the cylindrical hole section to the diameter of the plug head is set between 0.25 and 0.

5.

7. The solenoid valve according to claim 1, characterized in that, The ratio of the large end diameter of the tapered hole section to the diameter of the plug head is set between 0.5 and 0.

8.

8. The solenoid valve according to claim 1, characterized in that, The armature assembly also includes: An armature that extends axially along the sleeve; A plugging member is sleeved on the end of the armature near the first vent hole, and the plugging member has a plug head for closing the first vent hole.

9. The solenoid valve according to claim 8, characterized in that, The sealing element is made of an elastomeric material.

10. The solenoid valve according to claim 8, characterized in that, The sealing element is made of rubber or elastic plastic.

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