Core iron assembly and electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a core iron assembly and an electromagnetic valve. The core iron assembly comprises an iron core, a positioning pin, a valve needle and a first elastic piece, and a fixing hole and a mounting hole which communicate with each other are formed in the iron core. The positioning pin is inserted into the fixing hole and connected with the iron core, and at least part of the positioning pin is located in the mounting hole. The valve needle is movably mounted in the mounting hole, and at least part of the valve needle protrudes out of the mounting hole. The first elastic piece is arranged in the mounting hole, one end of the first elastic piece is connected with the positioning pin, and the other end is connected with the valve needle. When the valve needle moves in the direction away from the fixing hole relative to the iron core, the first elastic piece has the trend of driving the valve needle to move in the direction close to the fixing hole. According to the core iron assembly and the electromagnetic valve, the problem that the design of a compression spring in an existing core iron assembly is affected by a valve needle structure is solved.

Description

Technical Field

[0001] This application relates to the technical field of solenoid valves, and particularly to an armature assembly and a solenoid valve. Background Art

[0002] A solenoid valve is a component controlled by electromagnetism and is mainly used to control the on-off of fluid. At present, the armature assembly in a solenoid valve is mainly connected by an elastic member and an attractor. Among them, the attractor can generate a magnetic force to overcome the elastic force of the elastic member and drive the armature assembly to move, so as to realize the opening and closing of the solenoid valve.

[0003] In the related art, the armature assembly includes an iron core, a valve needle, and a compression spring. The valve needle is installed inside the iron core, the compression spring is sleeved on the outer periphery of the valve needle, and both ends of the compression spring are in abutting cooperation with corresponding structures on the iron core and the valve needle respectively. However, in this structure, the compression spring is affected by the structure of the valve needle, which is not conducive to the design of the compression spring and reduces the service life of the compression spring. Summary of the Utility Model

[0004] Based on this, it is necessary to provide an armature assembly and a solenoid valve to solve the problem that the design of the compression spring in the existing armature assembly is affected by the structure of the valve needle.

[0005] This application provides an armature assembly which is applied to a solenoid valve. The armature assembly includes an iron core, a positioning pin, a valve needle, and a first elastic member. A fixed hole and an installation hole that communicate with each other are formed in the iron core; the positioning pin is inserted into the fixed hole and connected to the iron core, and at least part of the positioning pin is located in the installation hole; the valve needle is movably installed in the installation hole, and at least part of the valve needle protrudes from the installation hole; the first elastic member is arranged in the installation hole, one end of the first elastic member is connected to the positioning pin, and the other end is connected to the valve needle; wherein, when the valve needle moves away from the fixed hole relative to the iron core, the first elastic member has a tendency to drive the valve needle to move towards the fixed hole.

[0006] In one embodiment, a through hole is formed at one end of the valve needle, a first hook portion is arranged at one end of the first elastic member close to the valve needle, and the first hook portion passes through the through hole and is hooked to the valve needle.

[0007] In one embodiment, a second hook portion is arranged at one end of the first elastic member close to the positioning pin, and the second hook portion is hooked to the outer periphery of the positioning pin.

[0008] In one embodiment, a first limiting surface and a second limiting surface are provided in the mounting hole at intervals along the axial direction. A limiting boss protrudes radially from the outer periphery of the valve needle, and the limiting boss is arranged between the first limiting surface and the second limiting surface; when the valve needle moves axially in the mounting hole, the first limiting surface and the second limiting surface can respectively cooperate with the two end surfaces of the limiting boss in a stopping manner.

[0009] In one embodiment, a stopping step is formed on the inner wall of the mounting hole, and the first limiting surface is formed at the end surface of the stopping step close to the limiting boss.

[0010] In one embodiment, the armature assembly further includes a washer, and the washer is arranged at one end of the mounting hole away from the fixing hole and is connected to the armature; wherein, the end surface of the washer close to the limiting boss forms the second limiting surface.

[0011] The present application further provides a solenoid valve, which includes a valve body assembly, a piston assembly, and the armature assembly according to any one of the above embodiments. The valve body assembly is provided with a valve cavity and a main valve port; the piston assembly is movably arranged in the valve cavity for opening or closing the main valve port, and the piston assembly is provided with a pilot valve port communicated with the main valve port. Wherein, the valve needle is movably matched with the pilot valve port to open or close the pilot valve port.

[0012] In one embodiment, the solenoid valve further includes a sleeve, an attractor, and a second elastic member. The sleeve is connected to one end of the valve body assembly; the attractor is installed at one end of the sleeve away from the valve body assembly, and the attractor is connected to the armature assembly through the second elastic member. Wherein, the armature assembly can move axially along the sleeve under the drive of the attractor and the second elastic member.

[0013] In one embodiment, the attractor is in interference fit with the sleeve, and / or, the attractor is fixedly welded to the sleeve.

[0014] In one embodiment, the valve body assembly includes a main valve body and a valve cover, and the valve cover is connected to the main valve body and encloses the valve cavity with the main valve body.

[0015] Compared with the prior art, for the armature assembly and the solenoid valve provided by the present application, by arranging a positioning pin on the armature and connecting the positioning pin and the valve needle with a first elastic member, since the first elastic member does not need to be sleeved on the outer periphery of the valve needle, the first elastic member can reasonably set its own stiffness, wire diameter, etc. according to actual needs, reducing the influence of the valve needle structure on the design of the first elastic member, thereby helping to improve the service life of the first elastic member. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A cross-sectional view of a core iron assembly according to an embodiment provided by the present application;

[0018] Figure 2 A schematic structural diagram of a valve needle according to an embodiment provided by the present application;

[0019] Figure 3 A schematic structural diagram of a first elastic member according to an embodiment provided by the present application;

[0020] Figure 4 A cross-sectional view of a solenoid valve in an initial state according to an embodiment provided by the present application;

[0021] Figure 5 A cross-sectional view of a solenoid valve in a first transitional state according to an embodiment provided by the present application;

[0022] Figure 6 A cross-sectional view of a solenoid valve in a second transitional state according to an embodiment provided by the present application;

[0023] Figure 7 A cross-sectional view of a solenoid valve in a final state according to an embodiment provided by the present application.

[0024] The meanings represented by the symbols in the figures are as follows:

[0025] 100, solenoid valve; 10, core iron assembly; 11, iron core; 1101, fixing hole; 1102, mounting hole; 111, stop step; 1111, first limiting surface; 12, positioning pin; 13, valve needle; 1301, through hole; 131, limiting boss; 14, first elastic member; 141, first hook portion; 142, second hook portion; 15, washer; 151, second limiting surface; 20, valve body assembly; 201, valve cavity; 202, main valve port; 21, main valve body; 22, valve cover; 30, piston assembly; 301, pilot valve port; 40, sleeve; 50, attractor; 60, second elastic member. Detailed implementation manners

[0026] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0027] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the specification of the present application are only for illustrative purposes and do not represent the only implementation manner.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present application, unless otherwise clearly defined and limited, the first feature may be in direct contact with the second feature "on" or "under" the second feature, or the first feature and the second feature may be in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "under" the second feature may mean that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature has a lower horizontal height than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.

[0031] A solenoid valve is a component controlled by electromagnetism and is mainly used to control the on / off of fluid. Currently, the armature assembly inside the solenoid valve is mainly connected by an elastic member and an attractor. Among them, the attractor can generate a magnetic force to overcome the elastic force of the elastic member and drive the armature assembly to move, thereby realizing the opening and closing of the solenoid valve.

[0032] In the related art, the armature assembly includes an iron core, a valve needle, and a compression spring. The valve needle is installed inside the iron core. The compression spring is sleeved on the outer periphery of the valve needle, and both ends of the compression spring are respectively in abutting cooperation with corresponding structures on the iron core and the valve needle. However, in this structure, the compression spring is affected by the structure of the valve needle, which is not conducive to the design of the compression spring and reduces the service life of the compression spring.

[0033] Please refer to Figures 1 - 7 , to solve the problem that the design of the compression spring in the existing armature assembly is affected by the structure of the valve needle, the present application provides an armature assembly 10, which is applied to a solenoid valve 100. The solenoid valve 100 further includes a valve body assembly 20 and a piston assembly 30. The valve body assembly 20 is provided with a valve cavity 201 and a main valve port 202. The piston assembly 30 is movably arranged in the valve cavity 201 for opening or closing the main valve port 202. The piston assembly 30 is provided with a pilot valve port 301 communicating with the main valve port 202. Among them, the valve needle 13 of the armature assembly 10 is movably matched with the pilot valve port 301 to open or close the pilot valve port 301. In this way, the armature assembly 10 can correspondingly close the main valve port 202 by closing the pilot valve port 301. Similarly, the armature assembly 10 can correspondingly open the main valve port 202 by opening the pilot valve port 301.

[0034] Please refer to Figures 1 - 3 , the armature assembly 10 provided by the present application includes an iron core 11, a positioning pin 12, a valve needle 13, and a first elastic member 14. The iron core 11 is provided with a fixed hole 1101 and a mounting hole 1102 that communicate with each other. The positioning pin 12 is inserted into the fixed hole 1101 and connected to the iron core 11, and at least part of the positioning pin 12 is located in the mounting hole 1102. The valve needle 13 is movably installed in the mounting hole 1102, and at least part of the valve needle 13 protrudes from the mounting hole 1102 for opening or closing the pilot valve port 301 on the piston assembly 30. The first elastic member 14 is arranged in the mounting hole 1102, and one end of the first elastic member 14 is connected to the positioning pin 12 and the other end is connected to the valve needle 13. Among them, when the valve needle 13 moves relative to the iron core 11 in a direction away from the fixed hole 1101, the first elastic member 14 has a tendency to drive the valve needle 13 to move in a direction close to the fixed hole 1101.

[0035] It can be understood that in the present application, by providing a positioning pin 12 on the iron core 11 and connecting the positioning pin 12 and the valve needle 13 by means of a first elastic member 14, since the first elastic member 14 does not need to be sleeved on the outer periphery of the valve needle 13, the first elastic member 14 can reasonably set its own stiffness and wire diameter according to actual needs, reducing the influence of the structure of the valve needle 13 on the design of the first elastic member 14, thereby contributing to improving the service life of the first elastic member 14.

[0036] Specifically, the first elastic member 14 can be a tension spring.

[0037] For the convenience of connecting the first elastic member 14 and the valve needle 13, in one embodiment, as Figure 2 and Figure 3 shown, a through hole 1301 is provided at one end of the valve needle 13, and a first hook portion 141 is provided at one end of the first elastic member 14 close to the valve needle 13. The first hook portion 141 passes through the through hole 1301 and is hooked to the valve needle 13. In this way, not only can a reliable connection between the valve needle 13 and the first elastic member 14 be achieved, but also the connection difficulty between the two is reduced, and the connection efficiency is improved.

[0038] Furthermore, in one embodiment, as Figure 1 and Figure 3 shown, a second hook portion 142 is provided at one end of the first elastic member 14 close to the positioning pin 12. The second hook portion 142 is hooked to the outer periphery of the positioning pin 12. In this way, not only can a reliable connection between the positioning pin 12 and the first elastic member 14 be achieved, but also the connection difficulty between the two is reduced, and the connection efficiency is improved.

[0039] In one embodiment, as Figure 1 shown, a first limiting surface 1111 and a second limiting surface 151 are provided in the mounting hole 1102 at intervals along the axial direction. A limiting boss 131 is formed to protrude radially along the outer periphery of the valve needle 13. The limiting boss 131 is provided between the first limiting surface 1111 and the second limiting surface 151. When the valve needle 13 moves axially in the mounting hole 1102, the first limiting surface 1111 and the second limiting surface 151 can respectively cooperate with the two end surfaces of the limiting boss 131 for stopping.

[0040] It is easy to understand that the first limiting surface 1111 and the second limiting surface 151 can limit the moving stroke of the valve needle 13 in the mounting hole 1102, preventing the valve needle 13 from disengaging from the mounting hole 1102, thereby improving the reliability of the movement of the valve needle 13.

[0041] Specifically, in one embodiment, a stop step 111 is formed on the inner wall of the mounting hole 1102. The end surface of the stop step 111 close to the limiting boss 131 forms the first limiting surface 1111. In this way, it is convenient for the formation of the first limiting surface 1111.

[0042] Further, in one embodiment, the core iron assembly 10 further includes a washer 15. The washer 15 is disposed at one end of the mounting hole 1102 away from the fixing hole 1101 and is connected to the iron core 11. Wherein, the end face of the washer 15 close to the limiting boss 131 forms a second limiting surface 151.

[0043] In this way, it is not only convenient for the installation of the valve needle 13, but also can realize the limitation of the valve needle 13.

[0044] Specifically, the washer 15 can be fixed to the iron core 11 by means of riveting or clamping to improve the connection strength.

[0045] When assembling the core iron assembly 10 provided in the present application, the first elastic member 14 and the valve needle 13 can be first connected and then placed into the mounting hole 1102, and then the washer 15 is installed at the opening of the mounting hole 1102, so as to realize the limitation of the valve needle 13. After that, the positioning pin 12 passes through the second hook portion 142 on the first elastic member 14 to realize the connection between the first elastic member 14 and the positioning pin 12. Of course, the first elastic member 14 can also be first connected to the positioning pin 12 and then connected to the valve needle 13, which is not limited here too much.

[0046] Please refer to Figures 4 - 7 , the present application also provides a solenoid valve 100, which includes a valve body assembly 20, a piston assembly 30 and the core iron assembly 10 of any one of the above embodiments.

[0047] Further, in one embodiment, as shown in the solenoid valve 100 further includes a sleeve 40, an attractor 50 and a second elastic member 60. The sleeve 40 is connected to one end of the valve body assembly 20. The attractor 50 is installed at one end of the sleeve 40 away from the valve body assembly 20, and the attractor 50 is connected to the core iron assembly 10 through the second elastic member 60. Wherein, the core iron assembly 10 can move axially along the sleeve 40 under the drive of the attractor 50 and the second elastic member 60. In this way, the movement of the core iron assembly 10 is realized.

[0048] Specifically, the magnetic force generated by the attractor 50 after being electromagnetized can overcome the elastic force of the second elastic member 60, thereby driving the core iron assembly 10 to move away from the pilot valve port 301. At this time, the pilot valve port 301 is opened, and the piston assembly 30 will move away from the main valve port 202 under the action of the pressure difference, so as to open the main valve port 202 and realize the opening of the solenoid valve 100. When the magnetic force applied by the attractor 50 on the core iron assembly 10 disappears, under the restoring action of the second elastic member 60, the core iron assembly 10 will block the pilot valve port 301 again, and drive the piston assembly 30 to move towards the main valve port 202 and block the main valve port 202, thereby realizing the closing of the solenoid valve 100.

[0049] Taking the opening process of the solenoid valve 100 as an example, during the opening process of the solenoid valve 100, the movement of the core iron component 10 has multiple transition states. Figure 4 As shown, the valve needle 13 on the core iron assembly 10 is abutted against the first limiting surface 1111 through the limiting boss 131, so that the end of the valve needle 13 can stably abut against the pilot valve port 301 to achieve the closure of the pilot valve port 301. At this time, the piston assembly 30 is blocked at the main valve port 202.

[0050] When the solenoid valve 100 is energized, Figure 5 As shown, at this time, the core iron assembly 10 is in the first transition state, and the iron core 11 is moved toward the attractor 50 by the magnetic force of the attractor 50 to overcome the elastic force of the second elastic member 60, and there is still a certain distance between the iron core 11 and the attractor 50. At the same time, the movement of the iron core 11 stretches the first elastic member 14, generating an elastic force, which will help the valve needle 13 to break away from the pilot valve port 301 to a certain extent, thereby improving the valve opening performance. At this time, the valve needle 13 is still blocked at the pilot valve port 301 on the piston assembly 30, and the piston assembly 30 is blocked at the main valve port 202.

[0051] It is understandable that if the iron core 11 directly drives the valve needle 13 to move, the iron core 11 needs to overcome the elastic force of the second elastic member 60 and the pressure difference force at both ends of the pilot valve port 301 at the beginning of its movement. However, at this time, the magnetic attraction force of the attractor 50 on the iron core 11 is minimal, and the pressure difference force that can be overcome is also small, so the valve opening ability is poor. However, by setting the first elastic member 14, the attractor 50 can directly drive the iron core 11 to move without overcoming the pressure difference force after power is turned on. As the iron core 11 approaches the attractor 50, the magnetic force of the attractor 50 is also strengthened accordingly. During this period, the elastic force generated by the stretching of the first elastic member 14 is used to overcome the pressure difference force, thereby improving the valve opening ability of the solenoid valve 100.

[0052] When the attractor 50 and the iron core 11 are attracted, Figure 6 As shown, at this time, the core iron assembly 10 is in the second transition state. Since the elastic force of the first elastic member 14 is greater than the pressure difference force of the fluid, the first elastic member 14 will drive the valve needle 13 to separate from the pilot valve port 301, so that the valve needle 13 moves and resets, and the cavities at both ends of the pilot valve port 301 are connected. At this time, the piston assembly 30 has a tendency to mainly separate from the valve port under the action of the pressure difference, and its final state is as shown in FIG. Figure 7 As shown, the piston assembly 30 moves away from the main valve port 202 to achieve communication of the internal flow path of the solenoid valve 100 .

[0053] In one embodiment, the attractor 50 and the sleeve 40 are interference fit to improve the connection strength between the attractor 50 and the sleeve 40 .

[0054] Further, in one embodiment, the attractor 50 is fixedly welded to the sleeve 40. Through welding and interference fit, the reliability of the connection of the attractor 50 to the sleeve 40 can be further ensured.

[0055] In one embodiment, as Figure 4 shown, the valve body assembly 20 includes a main valve body 21 and a valve cover 22. The valve cover 22 is connected to the main valve body 21 and encloses a valve cavity 201 with the main valve body 21. In this way, it is convenient to install the piston assembly 30.

[0056] Among them, the sleeve 40 can be welded to the valve cover 22 to achieve a firm connection between the sleeve 40 and the valve body assembly 20.

[0057] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0058] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A core iron component, used in a solenoid valve, characterized in that: The core iron assembly comprises an iron core (11), a positioning pin (12), a valve needle (13) and a first elastic member (14); the iron core (11) is provided with a fixing hole (1101) and a mounting hole (1102) which are interconnected; the positioning pin (12) is inserted into the fixing hole (1101) and connected to the iron core (11), and at least a portion of the positioning pin (12) is located in the mounting hole (1102); The valve needle (13) is movably mounted in the mounting hole (1102), and at least a portion of the valve needle (13) protrudes from the mounting hole (1102); the first elastic member (14) is disposed in the mounting hole (1102), and one end of the first elastic member (14) is connected to the positioning pin (12), and the other end is connected to the valve needle (13); When the valve needle (13) moves relative to the iron core (11) in a direction away from the fixing hole (1101), the first elastic member (14) has a tendency to drive the valve needle (13) to move in a direction close to the fixing hole (1101).

2. The core iron assembly according to claim 1, characterized in that: A through hole (1301) is provided at one end of the valve needle (13), and a first hook (141) is provided at one end of the first elastic member (14) close to the valve needle (13). The first hook (141) passes through the through hole (1301) and is hooked to the valve needle (13).

3. The core iron assembly according to claim 1, characterized in that: A second hook portion (142) is provided at one end of the first elastic member (14) close to the positioning pin (12), and the second hook portion (142) is hooked to the outer periphery of the positioning pin (12).

4. The core iron assembly according to claim 1, characterized in that: A first limiting surface (1111) and a second limiting surface (151) are arranged in the mounting hole (1102) at intervals along the axial direction, and the outer periphery of the valve needle (13) protrudes radially to form a limiting boss (131), and the limiting boss (131) is arranged between the first limiting surface (1111) and the second limiting surface (151); When the valve needle (13) moves axially in the mounting hole (1102), the first limiting surface (1111) and the second limiting surface (151) can respectively cooperate with the stoppers at both end surfaces of the limiting boss (131).

5. The core iron assembly according to claim 4, characterized in that: A stop step (111) is formed on the inner wall of the mounting hole (1102), and the end surface of the stop step (111) close to the limit boss (131) forms the first limit surface (1111).

6. The core iron assembly according to claim 4, characterized in that: The core iron assembly further comprises a washer (15), wherein the washer (15) is arranged at one end of the mounting hole (1102) away from the fixing hole (1101) and is connected to the iron core (11); Wherein, the end surface of the gasket (15) close to the limiting boss (131) forms the second limiting surface (151).

7. A solenoid valve, characterized in that: It comprises a valve body assembly (20), a piston assembly (30) and a core iron assembly according to any one of claims 1 to 6, wherein the valve body assembly (20) is provided with a valve cavity (201) and a main valve port (202); The piston assembly (30) is movably disposed in the valve cavity (201) for opening or closing the main valve port (202); the piston assembly (30) is provided with a pilot valve port (301) connected to the main valve port (202), wherein the valve needle (13) movably cooperates with the pilot valve port (301) to open or close the pilot valve port (301).

8. The solenoid valve according to claim 7, characterized in that: The solenoid valve further comprises a sleeve (40), an attractor (50) and a second elastic member (60), wherein the sleeve (40) is connected to one end of the valve body assembly (20); The attractor (50) is installed at one end of the sleeve (40) away from the valve body assembly (20), and the attractor (50) is connected to the core iron assembly through the second elastic member (60), wherein the core iron assembly can move along the axial direction of the sleeve (40) under the drive of the attractor (50) and the second elastic member (60).

9. The solenoid valve according to claim 8, characterized in that: The attractor (50) and the sleeve (40) are interference fit, and / or the attractor (50) and the sleeve (40) are fixed by welding.

10. The solenoid valve according to claim 7, characterized in that: The valve body assembly (20) comprises a main valve body (21) and a valve cover (22); the valve cover (22) is connected to the main valve body (21) and encloses the valve chamber (201) with the main valve body (21).

Images