A solenoid valve and control method thereof

Abstract

The present invention discloses a solenoid valve and a control method thereof, wherein the guide sleeve assembly and the outer shell are sealed and connected by an elastic sealing member; the first limit surface abuts against the ejector positioning end surface A, and the second limit surface abuts against the ejector rod positioning end surface B; the initial leakage hole is coaxially aligned with the discharge port, the ejector rod has no displacement, the ejector pin positioning end surface A abuts against the first limit surface, and the valve port opening is maximum; the ejector pin moves toward the valve port, the second leakage hole or the second leakage hole and the initial leakage hole are both connected to the discharge port, so that the ejector rod positioning end surface B abuts against the second limit surface, and the power is continuously supplied, the ejector rod continues to move toward the valve port, the conical sealing end is sealed and connected to the valve port, and the valve port opening is 0. Through the above manner, the present invention can improve the assembly accuracy while ensuring the sealing effect, and at the same time realize the controllable control process, thereby improving the control accuracy and flexibility.

Description

Technical Field

[0001] The invention relates to a solenoid valve and a control method thereof. Background Art

[0002] There is a sealed cavity in the solenoid valve, with through holes at different positions. Each hole is connected to a different oil pipe. There is a piston in the middle of the cavity and two electromagnets on both sides. The valve body will be attracted to the side where the magnet coil is energized. The different oil drain holes are opened or closed by controlling the movement of the valve body. The oil inlet hole is normally open, and the hydraulic oil will enter different oil drain pipes. Then the piston of the oil cylinder is pushed by the oil pressure, and the piston drives the piston rod, which drives the mechanical device. In this way, the mechanical movement is controlled by controlling the on and off of the current of the electromagnet.

[0003] The existing solenoid valve housing and the internal guide kit are mostly connected by fixed welding, which makes it impossible to control the installation accuracy, increases the difficulty of assembling the solenoid valve, and causes great difficulties for subsequent maintenance.

[0004] In addition, the process control of the solenoid valve's flow rate from large to small cannot be accurately controlled and has poor flexibility. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide a solenoid valve and a control method thereof, which can ensure the sealing effect while improving the assembly accuracy, and at the same time realize the controllable control process, thereby improving the control accuracy and flexibility.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a solenoid valve, comprising: an outer shell, a valve sleeve assembly and a push rod assembly, the push rod assembly reciprocates relative to the valve sleeve assembly, a guide sleeve assembly is arranged between the push rod assembly and the outer shell, and the guide sleeve assembly and the outer shell are sealed and connected by an elastic sealing member;

[0007] The ejector assembly comprises an ejector pin and an ejector pin, wherein the ejector pin is arranged in the cavity of the valve sleeve assembly, one end of the ejector pin is abutted against the ejector pin, and the other end is provided with a reset elastic member;

[0008] At least two leakage holes are opened on the ejector pin near the ejector rod end, which are an initial leakage hole and a second leakage hole respectively. The ejector pin end away from the ejector rod is a conical sealing end. The initial leakage hole and the second leakage hole both move relative to the discharge port on the valve sleeve assembly, and the conical sealing end moves relative to the valve port of the valve sleeve assembly.

[0009] A limiting elastic sheet is provided between the guide sleeve assembly and the valve sleeve assembly, and the limiting elastic sheet includes a first limiting surface and a second limiting surface. The first limiting surface abuts against the ejector pin positioning end surface A to limit the initial position, and the second limiting surface abuts against the ejector rod positioning end surface B to limit the peak position.

[0010] In a preferred embodiment of the present invention, the diameter of the discharge port is arranged from large to small along the direction from the end in contact with the leakage hole to the end away from the leakage hole.

[0011] In a preferred embodiment of the present invention, the second leakage hole is a leakage channel including multiple holes.

[0012] In a preferred embodiment of the present invention, the solenoid valve further comprises a coil seat, wherein the coil seat is arranged between the outer shell and the guide sleeve assembly, and the guide sleeve assembly is connected to the body by welding.

[0013] In a preferred embodiment of the present invention, the elastic sealing member is an O-ring.

[0014] In a preferred embodiment of the present invention, the thickness of the limiting elastic sheet is 0.1-0.5 mm.

[0015] In a preferred embodiment of the present invention, the cone angle of the cone sealing end is 0-90°

[0016] In a preferred embodiment of the present invention, the conical sealing end is a flat sealing end.

[0017] In order to solve the above technical problems, another technical solution adopted by the present invention is: to provide a control method of a solenoid valve, comprising the following steps:

[0018] ① Flow initial value, when the coil seat is not energized, the initial drain hole is coaxially aligned with the discharge port, the ejector pin has no displacement, the ejector positioning end face A is against the first limit face, and the valve opening is maximum;

[0019] ② At the flow peak, the coil seat starts to be energized, the ejector moves toward the valve port, the second leakage hole or the second leakage hole and the initial leakage hole are connected to the discharge port, so that the ejector positioning end face B and the second limit surface are against each other. During this process, the conical sealing end changes the opening of the valve port from large to small and maintains the opening;

[0020] ③ When the flow rate reaches the valley value, the power is still on and the push rod continues to move toward the valve port. The conical sealing end is sealed and connected to the valve port, and the valve port opening is 0;

[0021] ④Disconnect the power supply of the coil holder, reset the ejector assembly using the reset elastic member, and repeat steps ①~③.

[0022] The beneficial effects of the present invention are as follows: the present invention adopts an elastic seal to connect the outer shell and the guide sleeve assembly, which improves the assembly accuracy, reduces the assembly difficulty, and makes later maintenance more convenient; the structure of the limiting elastic sheet can more accurately control the flow change process from large to small, especially at the maximum flow rate, the limiting elastic sheet can achieve a clear transition between peak and valley values, so that the peak flow time is controllable and adjustable, thereby improving the control accuracy and flexibility of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0024] Figure 1 It is a structural schematic diagram of a preferred embodiment of the solenoid valve of the present invention;

[0025] Figure 2 yes Figure 1 The enlarged schematic diagram of the local structure of the solenoid valve shown;

[0026] Figure 3 yes Figure 1 A schematic diagram of a partially enlarged structure of a push rod assembly at a peak flow rate of the solenoid valve shown;

[0027] Figure 4 yes Figure 1 The structural schematic diagram of the solenoid valve at the flow valley value is shown. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the terms "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] See also Figure 1-4 , the embodiment of the present invention includes:

[0035] A solenoid valve comprises: an outer shell 1, a valve sleeve assembly 2 and a push rod assembly 3, wherein the push rod assembly 3 reciprocates relative to the valve sleeve assembly 2, a guide sleeve assembly 4 is provided between the push rod assembly 3 and the outer shell 1, and the guide sleeve assembly 4 and the outer shell 1 are sealed and connected via an elastic seal 5.

[0036] In the present invention, the elastic sealing member 5 is preferably an O-ring, which replaces the traditional welding connection, improves the assembly accuracy, reduces the assembly difficulty, and makes the later maintenance more convenient.

[0037] The solenoid valve further comprises a coil seat 6, wherein the coil seat 6 is arranged between the outer shell 1 and the guide sleeve assembly 4, and the guide sleeve assembly 4 is connected by body welding.

[0038] The ejector assembly 3 includes an ejector pin 31 and an ejector rod 32 . The ejector pin 31 is disposed in the cavity of the valve sleeve assembly 2 . One end of the ejector pin 31 is against the ejector rod 32 , and the other end is provided with a reset elastic member 33 . The reset elastic member 33 resets the entire ejector assembly 3 .

[0039] At least two leakage holes are provided on the ejector pin 31 near the ejector rod end, namely an initial leakage hole 311 and a second leakage hole 312. The end of the ejector pin 31 away from the ejector rod 32 is a conical sealing end 313. The initial leakage hole 311 and the second leakage hole 312 both move relative to the discharge port 211 on the valve sleeve assembly 2, and the conical sealing end 313 moves relative to the valve port 212 of the valve sleeve assembly 2, thereby changing the flow opening of the discharge port 211 and the valve port 212.

[0040] The cone surface angle of the cone surface sealing end 313 is 0-90°; the cone surface sealing end 313 may be a plane sealing end.

[0041] It is preferred that the diameter of the discharge port 211 is set from large to small along the direction from the end in contact with the leakage hole 311 to the end away from the leakage hole 311 to change the flow rate of the valve.

[0042] The second leakage hole 312 preferably includes a porous leakage channel to ensure the maximum flow rate and reach the peak flow rate.

[0043] A limiting elastic sheet 315 is provided between the guide sleeve assembly 4 and the valve sleeve assembly 2, and the limiting elastic sheet 315 includes a first limiting surface 3151 and a second limiting surface 3152. The first limiting surface 3151 abuts against the ejector pin positioning end surface A to limit the initial position, and the second limiting surface 3152 abuts against the ejector rod positioning end surface B to limit the peak position.

[0044] The thickness of the limiting elastic sheet 315 is 0.1-0.5 mm. By adjusting the thickness of the limiting elastic sheet 315, the flow rate variation range can be effectively controlled, precise control can be achieved, and flexibility can be improved.

[0045] A method for controlling a solenoid valve comprises the following steps:

[0046] 1. Initial flow value: when the coil seat 6 is not powered, the initial leakage hole 311 is coaxially aligned with the discharge port 211, the ejector pin 32 is not displaced, the ejector positioning end face A is in contact with the first limit face 3151, and the valve port 212 is opened to the maximum;

[0047] 2. At the flow peak, the coil seat 6 starts to be energized, the ejector pin 31 moves toward the valve port 212, the second leakage hole 312 or the second leakage hole 312 and the initial leakage hole 311 are connected to the discharge port 211, so that the ejector pin positioning end surface B and the second limiting surface 3152 are in contact with each other. During this process, the conical sealing end 313 changes the opening of the valve port 212 from large to small and maintains the opening;

[0048] 3. When the flow rate reaches the valley value, the power is continuously supplied, and the push rod 32 continues to move toward the valve port 212, the conical sealing end 313 is sealed and connected with the valve port 212, and the opening of the valve port 212 is 0;

[0049] 4. Disconnect the power supply of the coil holder 6, reset the ejector assembly 3 by the reset elastic member 33, and repeat steps 1 to 3.

[0050] The control method designed in the present invention is combined with the structure of the limit plate, which can more accurately control the change process of flow from large to small. Especially at the maximum flow, the limit elastic plate can be used to achieve a clear transition between peak and valley values, making the peak flow time controllable and adjustable, thereby improving the control accuracy and flexibility of the solenoid valve.

[0051] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A solenoid valve, characterized in that: include: An outer shell, a valve sleeve assembly and a push rod assembly, wherein the push rod assembly reciprocates relative to the valve sleeve assembly, a guide sleeve assembly is provided between the push rod assembly and the outer shell, and the guide sleeve assembly and the outer shell are sealed and connected via an elastic sealing member; The ejector assembly comprises an ejector pin and an ejector pin, wherein the ejector pin is arranged in the cavity of the valve sleeve assembly, one end of the ejector pin is abutted against the ejector pin, and the other end is provided with a reset elastic member; At least two leakage holes are opened on the ejector pin near the ejector rod end, which are an initial leakage hole and a second leakage hole respectively. The ejector pin end away from the ejector rod is a conical sealing end. The initial leakage hole and the second leakage hole both move relative to the discharge port on the valve sleeve assembly, and the conical sealing end moves relative to the valve port of the valve sleeve assembly. A limiting elastic sheet is provided between the guide sleeve assembly and the valve sleeve assembly, and the limiting elastic sheet includes a first limiting surface and a second limiting surface. The first limiting surface abuts against the ejector pin positioning end surface A to limit the initial position, and the second limiting surface abuts against the ejector rod positioning end surface B to limit the peak position.

2. The solenoid valve according to claim 1, characterized in that: The diameter of the discharge port is arranged from large to small along the direction from the end in contact with the leakage hole to the end away from the leakage hole.

3. The solenoid valve according to claim 1, characterized in that: The second leakage hole is a leakage channel including multiple holes.

4. The solenoid valve according to claim 1, characterized in that: The solenoid valve also includes a coil seat, which is arranged between the outer shell and the guide sleeve assembly, and the guide sleeve assembly is connected to the body by welding.

5. The solenoid valve according to claim 1, characterized in that: The elastic sealing member is an O-ring.

6. The solenoid valve according to claim 1, characterized in that: The thickness of the limiting elastic sheet is 0.1-0.5 mm.

7. The solenoid valve according to claim 1, characterized in that: The cone angle of the cone sealing end is 0-90°.

8. The solenoid valve according to claim 1, characterized in that: Conical sealing end or flat sealing end.

9. The control method of the solenoid valve according to any one of claims 1 to 8, characterized in that: The following steps are involved: ① Flow initial value, when the coil seat is not energized, the initial drain hole is coaxially aligned with the discharge port, the ejector pin has no displacement, the ejector positioning end face A is against the first limit face, and the valve opening is maximum; ② At the flow peak, the coil seat starts to be energized, the ejector moves toward the valve port, the second leakage hole or the second leakage hole and the initial leakage hole are connected to the discharge port, so that the ejector positioning end face B and the second limit surface are against each other. During this process, the conical sealing end changes the opening of the valve port from large to small and maintains the opening; ③ When the flow rate reaches the valley value, the power is still on and the push rod continues to move toward the valve port. The conical sealing end is sealed and connected to the valve port, and the valve port opening is 0; ④Disconnect the power supply of the coil holder, reset the ejector assembly using the reset elastic member, and repeat steps ①~③.

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